Link-Belt® Screw Conveyors

Link-Belt®Screw Conveyors

www.syntronmh.com

Table of ContentsIntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Description of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ComponentsClamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Conveyor Screws, Helicoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Conveyor Screws, Sectional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Covers, Flared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Covers, Hip Roof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Covers, Semi-Flanged and Flanged . . . . . . . . . . . . . . . . . . . . . . . 86

End Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

End Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Flighting, Helicoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Flighting, Sectional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Ribbon Conveyor Screws and Flighting . . . . . . . . . . . . . . . . . . . 56

Seal Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Seals, Trough End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Shafts, Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Shafts, Drive and End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Slide Gates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Split Flight Couplings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Spout, Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Spout, Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Components (cont'd.)Shrouds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Supporting Feet / Saddles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Trough End Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Troughs, Double Flanged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Troughs, Flanged and Angle Flanged . . . . . . . . . . . . . . . . . . . . . 83

Troughs, Flared . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Troughs, Tubular . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

EngineeringCapacity Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Component Groups - Class of Service . . . . . . . . . . . . . . . . . . . . . 39

Component Group Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Conveyor Designation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Conveyor Screw Deflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Horsepower Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Material Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Selection of Conveyor Size and Speed . . . . . . . . . . . . . . . . . . . . 35

Screw Feeders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Torsional Ratings of Conveyor Screw Parts . . . . . . . . . . . . . . . . 43

Layout and DesignLayout Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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Two powerful industry leading brands—Link-Belt® andSyntron®—have come together under a new company name,Syntron Material Handling, LLC, for one goal – better engineeredproducts.

Established in May 2014, Syntron Material Handling (SMH) wasbuilt out of the legacies of Link-Belt® Company and SyntronCompany, formerly owned by Syntron Material Handling. Today,our 300 skilled employees have a combined 4,212 years ofindustry knowledge that they put into the SMH product every day.We are dedicated to providing customers with complete materialhandling solutions.

Let Syntron Material Handling’s knowledgeable team help yourbusiness with conveying, feeding, screening, elevating, vibratoryflow aids, and mining controls of bulk product. Whetheroptimizing existing systems or starting from the ground-up onnew and customized plants or mines, our dedicated staff willprovide you with the most efficient and cost-effective solutions.

“Our company structure will be very exciting and fast-paced as we charter our new path. The positive attitudes and skills of ouremployees, the strength of our products, and our long-termcustomer relationships are our foundation for success.” said CEOAndy Blanchard.

An international leader for innovative solutions, Syntron MaterialHandling can improve the technology customers are alreadyusing. The Link-Belt® expertise and equipment have beeninstrumental in developing some of the world’s largest beltconveyors. The Syntron® feeders are instrumental to supplyingenergy sources and material handling efforts across the globe.

Levine Leichtman Capital Partners, the new owner of SyntronMaterial Handling, is committed to the success and growth of thecompany by investing in engineering capabilities, manufacturingefficiency, and customer service.

Although we may have a new name, we still have the samededicated employees and industry leading engineered productsthat make us a market leader.

Syntron Material Handling operates two manufacturing facilitiesin the USA and China.

All of our products are produced to OSHA/MSHAstandards and ISO Standard 9001:2008. We are acharter member of CEMA, and active members ofNSSGA, NMA, SME, FEMA, and PMMI.

Call us today for all your material handling needs.

Saltillo Changshu2730 Hwy 145 South #2 Road No. 1Saltillo, Mississippi 38866 Changshu Export Processing ZonePhone: 662.869.5711 Changshu, Jiangsu, China 215513Fax: 662.869.7493 Phone: +86 0512.52299002800.356.4898 Fax: +86 [email protected]

Proven Engineered Products – Complete Material Handling Solutions

2 Dimensions subject to change without notice. Certified prints are available upon request.

Greek mathematician and physicistArchimedes is acknowledged as theinventor of the screw conveyor in235-240 B.C., and essentially hisdesign has not changed since then.

Syntron Material Handling and Link-Belt® added the new andinnovative applications which make the Archimedian screw theindispensable tool it is. Plus, SyntronMaterial Handling's conveyorequipment specialists improvedmaterials and fabrication techniquesand added electricity as a powersource in the 125 years we navespecialized in manufacturing screwand conveyor components.

To the basic Archimedian screw Link-Belt® and Syntron MaterialHandling added conveyor systems and screw feeders, designed them forevery conceivable application andmanufactured them so well we havebecome the standard for the industry.

Application engineering is a majorreason for the industry's wideacceptance of the Link-Belt® screwconveyor. Studied attention to detailduring this phase eliminates costlyinstallation and operation errors.

Close tolerance machining andfabrication in our state-of-the-artmanufacturing facility assureequipment quality and performance.

Our ability to meet your needs with abroad selection of screw conveyorsand components is important to you,plus your confidence that theequipment you purchase from SyntronMaterial Handling will earn its stripesand pay its own way, giving you agood return on your investment.

Link-Belt® Screw Conveyors and Screw FeedersQuality Bulk Handling Equipment that Pays Its Way

Link-Belt® Screw Conveyors servemodern industry in a wide varietyof ways:

• Conveying • Distributing• Collecting • Mixing • Heating• Cooling • Elevating • Batching• Blending • Aerating • Providingcrystallization or coagulant actionand more.

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Unmatched versatility.

Syntron Material Handling is industry'slargest supplier of screw conveyors,feeders and components. You'll findhard-working Link-Belt® ScrewConveyors in a broad range ofapplications, handling everything fromalfalfa meal to zinc oxide-over 250types of materials. And it doesn'tmatter whether the material is light orheavy, fine or coarse, granular or flaky,hot or cold, wet or dry, sluggish orfree-flowing. Syntron MaterialHandling’s Link-Belt® ScrewConveyors can handle it effectivelyand economically.

There is a wide selection of Link-Belt®Screw Conveyor types to choose from.We make a complete line of screwfeeders, conveyor screws, troughs,trough ends, hangers, bearings, shafts,seals and drives.

Top Left: Granular feed supplement beingconveyed into storage at a poultry processingfacility.

Center Left: Heilcoid flight conveyorscrews perform efficiently on many snowthrower models.

Center Right: Twin 12-inch diameter screwconveyors with fully enclosed dust-tighttroughs handling pulverized boiler fuel inpower generating plant.

Bottom: Helicoid screw conveyors are essentialcomponents in this flour collecting systemlocated in a large bakery.


Engineered for every type of service.

No one can match our ability togive you the right equipment foryour application. Syntron MaterialHandling engineers pioneered thedevelopment of screw conveyors andcomponents for the widest range ofmaterials, purposes and applications.Whether the job involves light-dutyservice-conveying egg powder, forexample-or severe operatingconditions-like round-the-clock coaldelivery to a power plant-we have thein-depth knowledge and experience toprovide just what you need.

Link-Belt® Screw Conveyors areruggedly built, accuratelymanufactured and performanceproven. And our unequalled fieldexperience is your assurance of thebest in service and recommendations.

Clean, compact design saves space,simplifies installation.Link-Belt® Screw Conveyors adaptreadily to tight quarters and congestedlocations. No matter how many twistsand turns your operation takes, thereis a Link-Belt® space saving ScrewConveyor to fit. Our conveyors operateeffectively in horizontal, vertical orinclined positions. Their compactdesign permits easy installation. Andthey're simple to support.

If you should need replacement parts,you can count on controlled-tolerancestandardized parts that meet CEMAspecifications. They're interchangeablefor fast, easy assembly, and they don'trequire special tools.

So if space is at a premium, or ifyou want simple installation andmaintenance for better on-lineperformance, dependable Link-Belt®Screw Conveyors are your best choice.

Top: Sugar is handled by twin screw feeders andhelicoid conveyors in this large bakery. Drop-bottom troughs permit easy access and quickcleaning of all parts.

Center: Screw conveyor augers are used throughoutthis combine for gathering, conveying, elevatingand distributing the harvest.

Bottom Left: Heavy-duty sectional flight conveyoraugers installed on boring machine.

Bottom Right: Totally enclosed screw conveyors canassure a clean, safe operation.

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When you buy from Syntron MaterialHandling, you can rely on our factory-stocked equipment and parts. You keepdowntime to a minimum because youget fast turnaround-from order entry toparts delivery at your plant or jobsite.

When it comes to bulk materialhandling, think Syntron MaterialHandling. Syntron Material Handling has theuncommon ability to solve any screwconveying problem you might face.We’ve got the equipment selection,experience and the service you expectto operate your material handlingfacility.

Top Right - Over 40 feet of screw conveyors carry maltand rice from storage to mills in this factory.

Center Left - Typical installation provides close fittinggates and connections,

Center Right - Helicoid screw conveyor delivers 50tons of coal per hour to boiler room bunkers.

Bottom - Granular shell lime distribution system at alarge chemical facility.

Nearby service when you need it.


Component Description

Screw conveyors are one of the oldestand simplest methods for moving bulkmaterials and consist primarily of aconveyor screw rotating in a stationarytrough, Material placed in the troughis moved along its length by rotationof the screw which is supported byhanger bearings. Inlets, outlets, gatesand other accessories control thematerial and its disposition.

Screw conveyors are compact, easilyadapted to congested locations andcan be mounted horizontal, vertical,and in inclined configurations. Theirsupports are simple and easilyinstalled.

These versatile conveyors can be usedto control the flow of material in pro-

processing operations which dependupon accurate batching . . . or as amixer, agitator or stirrer to mix andblend dry or fluid ingredients, providecrystallization or coagulant action, ormaintain solutions in suspension,

Screw conveyors can be effectivelysealed to prevent dust or fumes fromescaping or dirt or moisture fromentering. They can be jacketed toserve as a dryer or cooler, or furnishedin a wide variety of materials to resistcorrosion, abrasion or heat.

Screw conveyors are used as earthaugers to dig post holes or to boreunder highways for installation ofculverts. They are also used

extensively on combines, threshingmachines, hay bailers, fodder blowersand many other farm machines.

Screw feeders are modified screwconveyors used to control the flow ofmaterial at a constant or variable ratefrom track hoppers, storage hoppers,bins or tanks. They are suitable forhandling a wide variety of materialsranging from fines to a combination offines and lumps. Under manyconditions, feeders are also used as avalve.

Screw feeders are totally enclosed,compact, simple in design and dust-tight. They are economical to install,operate and maintain.

Conveyor ScrewThe conveyor screw is the rotatingportion of a screw conveyor whichimparts smooth and positive motion tothe bulk material being conveyed. Itconsists of spiral flighting mounted on

a pipe and is made either right or lefthand to suit the screw rotation and thedesired direction of material travel.

Conveyor Screw with Drive ShaftThe conveyor drive shaft connects theconveyor screw to the driving unit andtransmits rotary motion to the screw.Coupling bolts secure the drive shaft inthe conveyor screw.

Conveyor Screw with DriveShaft, End Shaft and CouplingThe conveyor drive shaft, end shaftand coupling support the conveyorscrew sections and keep them inalignment. The end shaft is located atthe end opposite the drive shaft.Couplings are used to connect

successive conveyor screw sectionswhen more than one section isnecessary to make up the total lengthof conveyor. The shafts and couplingare secured in the conveyor screws bycoupling bolts.

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component description

Trough Ends and Hangers

The trough ends support the conveyordrive and end shafts while the hangerssupport the conveyor couplings,thereby maintaining proper alignmentand clearance between the conveyorscrew and trough.

To provide additional protection forthe drive shaft and end shaft bearings,for or against the material beinghandled, trough end seals are

assembled between the flanged blocksand the trough end plates.

Conveyor Trough with InletOpening and Discharge SpoutThe trough is the enclosure in whichthe material is confined and guided inits movement. Trough end flangespreserve the contour of the trough,facilitate assembly of adjoiningsections, and insure accuratealignment. Supporting feet at thetrough joints or saddles locatedbetween the joints, support theintermediate trough sections.

Discharge spouts provide outlets for thematerial and direct its flow to binsor succeeding equipment- With morethan one discharge point in a conveyor,selective control may be exercised bymeans of slide gates, made integralwith the discharge spouts.

Trough covers with fasteners completethe conveyor enclosure. Material is fedinto the conveyor through inletopenings in the cover.

Typical Screw ConveyorComplete With DriveA shaft mounted speed reducer makesa simple and compact drivecombination. The drive consists of astandard shaft-mounted speed reducerwith adapter having a built-in, seal andmounted on a steel plate trough end. Awelded steel adjustable motor supportbracket is rigidly mounted on theadapter and provides ample clearanceover the trough end for easy troughcover removal.



Helicoid Flight Conveyor Screws Thehelicold flight conveyor screw is madeof a helix, formed from a flat steel baror coil strip and mounted on a pipe orshaft. The helix, formed by specialrolling equipment to the requireddiameter, pitch and thickness, is asmooth, continuous one-piece flight.

By virtue of its one-piececonstruction, it possesses superiorstrength. The absence of laps, rivetsor welds on the carrying face of theFlight promotes and maintainscleanliness and reduces wear. Therolling process effects a hardeningand smoothing of the flight surfacewhich increases resistance to wearand reduces friction and powerconsumption.

The flight is fastened to the pipe, orshaft, by intermittent or continuouswelds and with or without formed steelend lugs. The pipe, of a size carefullyselected for adequate torsional strengthand resistance to excessive deflection,has internal collars at each end. Thesecollars are permanently inserted andhave appropriate inside diameters toaccept coupling or end shafts.

The assembled helicoid flight conveyorscrew is solidly constructed andexceptionally sturdy, and its inherentbalance permits operation at highspeeds. Its distinctive characteristicscontribute to maximum efficiency,durability and economy.

Helicold flight conveyor screws areinterchangeable with sectional flightconveyor screws of the same diameterand shaft size.

Helicold flighting is made with regularpitch approximately equal to thediameter. It can also be furnished withother than regular pitch and in a widerange of diameters, thicknesses andlengths to meet the most exactingrequirements.

For extremely heavy duty the flightingmay be continuously welded to thepipe or shaft on one or both sides.

Consult Syntron Material Handling forinformation on special requirements.

Sectional Flight Conveyor ScrewsSectional flight conveyor screws aremade of individual flights, eachblanked from a flat steel plate andformed into a helix. The flights arebutt welded together and fastened tothe pipe or shaft by intermittentor continuous welds and with orwithout formed steel end lugs.Sectional flights are formed withregular pitch approximately equal tothe diameter.

Sectional flight conveyor screws areinterchangeable with helicoid flightconveyor screws of the same diameterand shaft size.

Sectional flights afford flexibility inchoice of diameters, pitches and

thicknesses. The sectional flightconveyor screw is a sturdily constructed assembly, carefullydesigned to render efficient, economicaland lasting service.

When desired, sectional flights may be lap welded together, or flights maybe continuously welded to the pipe onone or both sides, thus providingexceptionally rugged construction forthe most severe conveying applications.

Many variations of sectional flightconveyor screws can be furnished tomeet specific needs. Some of these arelisted on the following pages.

Quik-Link Conveyor ScrewsThe Quik-Link conveyor screw Isdesigned for easy removal from theconveyor trough. Each section of screwis provided with a Quik-Link keylocated at one end of the pipe. Byremoving this key, a conveyor screw

section and coupling with hanger canbe quickly and convenientlydisassembled without disturbing othercomponents. Quik-Link conveyor screwsare available in both the helicold flightand sectional flight construction.

Conveyor Screws

Helicoid flight conveyor screw

Sectional flight conveyor screw

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Cut flight conveyor screws have notches cut in theperiphery of either helicoid or sectional flights.These notches supplement the conveying action witha moderate mixing action. They are used for light,fine, granular or flaky materials.

Ribbon flight conveyor screws consist of continuoushelical flighting formed from steel bar and securedto the pipe by supporting lugs. They are used forconveying sticky, gummy or viscous substances, orwhere the material tends to stick to flighting at thepipe.

Conveyor screws with paddles have paddles spacedat intervals and set to partially oppose the forwardflow, to provide a moderate mixing or stirring ofmaterials being conveyed. Paddles are adjustableand may be set at any angle to produce the desireddegree of agitation. They are used for light ormedium weight, fine, granular or flaky materials.

Cut and folded flight conveyor screws provide foldedsegments which act as lifting vanes to produce acascading effect. This promotes agitation andaeration, resulting in better mixing. They are usedfor light or medium weight, fine, granular or flakymaterials.

Short pitch conveyor screws are of regularconstruction except that the pitch of the flights isreduced. They are recommended for use in inclinedconveyors of 20 degrees slope and over, includingvertical conveyors and are extensively use as feederscrews. They retard flushing of materials of a fluidnature.

Cut flight conveyor screws with paddles have paddlesmounted at intervals and set to counteract the flow ofmaterials, considerably increasesthe agitation and mixing action produced by the cutflights.

Paddle conveyor screws have formed steel bladesmounted on rod shanks inserted through the pipe.Conveying action can be controlledby adjusting the angle of the paddles. Theyare used for mixing, blending or stirring dry orfluid materials.


Conveyor Screws


Tapering flight conveyor screwsare frequently used as feeder screws forhandling friable lumpy material from binsor hoppers and also to draw the materialuniformly from the entire length of thefeed opening.

Stepped diameter conveyor screwsconsist of flights of different diameters,each with its regular pitch, mounted intandem on one pipe or shaft. They arefrequently used as feeder screws, with thesmaller diameter located under bins orhoppers to regulate the flowof material.

Stepped pitch conveyor screwsare screws with succeeding single orgroups of sectional flights increasing inpitch and are used as feeder screws todraw fine free-fIowing materials uniformlyfrom the entire length of the feed opening.

Long pitch conveyor screwsare occasionally used as agitatorsfor liquids or rapid conveying of veryfree-flowing materials.

Double fIight conveyor screwsof regular pitch promote a smooth gentleflow and discharge of certain materials.

Double flight short pitch conveyor screwsassure more accurate regulation of feedand flow in screw feeders and effectivelydeter flushing action of fluid materials.


Conveyor Screws

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Conveyor ScrewsRibbon Flight Conveyor Screwsconsist of sectional flights, buttwelded together to form a continuoushelix. Flights are secured to the pipeby supporting lugs.

Variations of diameter, pitch, flightwidth or thickness can be furnished.Also, these screws can be furnishedwith either continuous or sectionalflights, lap or butt welded together.

Ribbon flight conveyor screws are thesolution to most conveying problemsencountered in the handling of sticky,gummy or viscous materials. Thetendency of materials of this nature toadhere and build up at the juncture ofsolid flight with the pipe is overcomeby the open construction of the ribbonflight. Raw sugar, molasses, asphalt,hot tar, sticky feed mixes, and similarproducts are typical of the manymaterials successfully handled byribbon flight conveyor screws.

Providing the periphery of ribbonflights with a beveled edge improvesoperation and reduces powerconsumption when handling materialswhich tend to pack or trowel betweenflights and trough. Consequently,beveled edge ribbon flight conveyorscrews are usually subjected toextremely heavy loads, andconstruction is accordingly heavy andrugged. The ribbon flights aresupported on the pipe or shaft by steel lugs, generously proportioned toresist bending.

Where the material handled movesvirtually en masse, there is but veryslight difference in capacity betweenribbon and solid flight conveyor screwsof the same size. Mixing action withoutsupplementary means of agitation isnegligible.

Ribbon Flight Conveyor Screw withPaddlesTo provide moderate mixing or stirringof materials being conveyed, paddlescan be furnished, spaced at intervalsand set to partially oppose the forwardflow. Paddles are adjustable and may beset at any angle to produce the desireddegree of agitation. They are used forlight or medium weight, fine, granularor flaky materials.

Multiple Ribbon Flight ConveyorScrewsThis type of screw consists of two ormore ribbon flights of differentdiameters and opposite hand, mountedone with in the other on the same pipeor shaft by rigid supporting lugs.Material is moved forward by one flightand backward by the other, therebyincluding positive and thorough mixing.

Abrasion-Resistant Conveyor Screws The particularly severe serviceencountered when conveying abrasivematerials has prompted many attemptsto overcome excessive wear on flights.Several successful methods have beendeveloped.

Each of these methods offers specificadvantages depending on the nature ofthe material handled and theapplication. For a careful analysis andrecommendation, consult SyntronMaterial Handling.

Hard surfacing by application of aspecial compound, by arc or torch, tothe flight periphery or face, or both,provides an exceptionally hard surfaceat the points of greatest wear.

For severe applications, conveyors withhigh alumina ceramic tile bonded tothe flight periphery or face are alsoavailable.

Corrosion-Resistant ConveyorScrewsCorrosion is manifested in so manydifferent ways that no one choice ofmaterial will suit all requirements. Towithstand the effects of corrosionencountered in many fields of industry,conveyor screws are fabricated ofstainless steel, Monel metal, aluminum,and other materials.

Galvanizing and other coating methodshave proved effective under mildlycorrosive conditions. Vulcanized orbonded rubber covering of the entireconveyor is frequently satisfactory forresistance to extremely corrosiveaction.

Heat-Resistant Conveyor ScrewsConveyor screws for high temperatureapplications are made of many of theavailable heat-resistant alloys. Severalof the stainless steels and other high-chrome alloys are particularly suitablefor this service.

Ribbon flight conveyor screw

Ribbon flight conveyor screw with paddles



Drive Shafts, End Shafts and Couplings

Conveyor drive shaft

Conveyor end shaft

Conveyor coupling

Quik-Link conveyor screw

Split flight coupling

The conveyor drive shaft delivers thedriving power, and is therefore carefullydesigned of quality steel of the propercharacteristics to provide adequatetorque, bending and shear strength, andwith closely controlled tolerances forcorrect bearing clearances.

For conveyors of unusual length or forseverely heavy loads, alloy steels, heat-treated high carbon steels or 3-bolt connections, are used.

Jig-drilled coupling bolt holes andaccurately cut keyways contribute toease of assembly.

The conveyor end shaft supports thelast section of conveyor screw and isfurnished with close tolerances forproper operation in end bearing.Coupling bolt holes are jig drilled forinterchangeability and ease of assembly.

Conveyor couplings connect and spaceadjoining sections of conveyor screwand transmit rotation.

Carefully selected steels, with accurateheat-treating or hard surfacing whenrequired, insure ample strength andresistance to wear for the kind ofservice specified.

For conveyors of unusual length or forseverely heavy loads, alloy steels, heat-treated high carbon steels or 3-boltconnections are used.

Close tolerances on diameters andjig-drilled coupling bolt holes assureinterchangeability and ease of assembly.

Quik-Link conveyor screws provide aneasy means for the quick removal of aconveyor screw section and couplingwith hanger without disturbing othercomponents. Regular couplings are usedwith these screws.

Split flight couplings permit installingor removing individual conveyorscrews without disturbing adjoiningsections. With split flight couplingsinstalled on both sides of eachhanger, conveyor screws can beremoved without disturbing thehangers. The Link-Belt® split flightcoupling is sturdily constructed andjig-drilled for coupling bolts.


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HangersNo. 216 hangers have formed steel box frames of superiorstrength and rigidity and are excellent for heavy service. They aremounted with in the conveyor trough. Mounting holes are slottedparallel with the conveyor to permit adjustment and alignment.These hangers are normally furnished with hard iron, babbitted,bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.

No. 216F hangers are similar in construction to No. 216 hangersexcept they are designed to mount in, flared trough.

No. 220 hangers are similar in construction to No. 226 hangers,except they are mounted on top of the trough flanges. Mountingholes are slotted parallel with the conveyor to provideadjustment and alignment. These hangers are normally furnishedwith hard iron, babbitted, bronze, oil impregnated wood ormolded fabric bearings, but can also be furnished with specialbearings.

No. 226 hangers have a rigid, formed-steel box frame withclearance for passage of material in large volume. They aremounted within the conveyor trough. Mounting holes are slottedparallel with the conveyor to permit adjustment and alignment.These hangers are normally furnished with hard iron, babbitted,bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.

No. 270 ball bearing hangers have self-aligning ball bearings.The frame is a box-member top-bar with a pipe stem support forthe bearing. The bearing is factory adjusted for the proper lengthfrom the top-bar and locked with a sealant and a lock nut. Theframe is designed for mounting inside the trough and slottedmounting holes parallel to the conveyor permit adjustment andalignment.

No. 316 hangers have formed steel frames of superior strengthand rigidity and are excellent for heavy service. They aremounted within the conveyor trough, are self-adjusting and willaccommodate operating variations which may exist between theconveyor screw and trough. Mounting holes are slotted parallelwith the conveyor to permit adjustment and alignment. Thesehangers are normally furnished with hard iron, babbitted, bronze,oil impregnated wood or molded fabric bearings, but can also befurnished with special bearings.

No. 326 hangers have a rigid, formed steel frame with clearancefor passage of material in large volume. They are mounted withinthe conveyor trough, are self-adjusting and will accommodateoperating variations which may exist between the conveyorscrew and the trough. Mounting holes are slotted parallel withthe conveyor to permit adjustment and alignment. These hangersare normally furnished with hard iron, babbitted, bronze, oilimpregnated wood or molded fabric bearings, but can also befurnished with special bearings.

No. 216 hangers

No. 216F hangers

No. 220 hangers

No. 226 hangers

No. 270 ball bearinghangers

No. 316 hangers

No. 326 hangers



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Trough End Plates

Trough end with feetTrough end without feet

Tubular trough end Flared trough end

Trough end with doubleroller bearing

Trough end plates for either U-trough or flared trough aremade of heavy gauge steel plate with the top flanged tosupport the trough cover. They are furnished with orwithout supporting feet.

Trough end plates can be made of stainless steel ornonferrous metals for corrosive or high temperatureapplications. They can also be furnished with protectivecoatings, such as galvanizing.

They may be equipped with either sleeve, bolt, or rollerbearing flange blocks, or with the addition of a mountingshelf, pillow block bearings.

Drive Shaft Trough Ends are of the double ball bearingand double roller bearing types. Each consists of a rigidshaft, operating in double bearings and designed toaccommodate both radial and thrust loads. The radial oroverhung load is usually a chain drive connected to apower source. Since the bearings will also accept thrustloads in either direction, the need for auxiliary thrusts iseliminated.

Drive shaft trough ends with double ball bearings consistof double ball bearing flanged blocks rigidly attached toheavy steel plate trough ends for either U-troughs orflared troughs. The gray iron housings are of one-piececonstruction and are precision machined for accuratealignment. Effective seals are provided in the flangedblocks to exclude dirt and moisture and retain lubricant.

Drive shaft trough ends with double roller bearings consistof heavy duty double roller bearing flanged blocksmounted by means of machined surfaces into extra heavysteel plate trough ends for either U-troughs or flaredtroughs. The gray iron housings are accurately machinedand fitted with roller bearings of high radial and thrustcapacity. The blocks have effective seals and are arrangedfor easy lubrication.

Countershaft trough ends are used on screw conveyorswhere application of right angle drives is necessary due tospace limitations, interference of adjoining equipment orfor better service and maintenance accessibility.

Application of countershaft trough ends permits driveinstallations alongside, above or below the conveyor andpermits using horizontal drives for inclined conveyors. Acommon drive for two conveyors intersecting at rightangles, or a battery of parallel conveyors driven from acommon source, can be readily arranged.

15


Seal Glands, Trough End Seals andTrough End Bearings

Seal glands and trough end sealsare used to provide additional bearingprotection against dust or fumes fromwithin the trough and prevent entrance,along the shaft, of dirt, moisture orlubricant.

The trough end seal housings aremade of gray iron and are designedfor assembly between babbitted,bronze or ball bearing flanged blocksand the trough end plates. They canbe provided with lip-type seals foreffective protection for or against thematerials being handled, with feltseals when handling dusty materials,or with waste packing when handlingabrasive materials.

Seal glands consist of gray iron, splitflanges into which packing materialsare compressed against machined steelcollars. They are used internally on alltrough ends except the outboardbearing type on which they areexternally mounted. These sealsprovide maximum protection for oragainst the materials being handled.

Trough end bearingsBabbitted and bronze bearing flangedblocks are made with one-piece gray ironhousings. Babbitted bearing blocks arefor general use where loads and speedsare moderate. Bronze bearing blocks areused where heavy bearing pressures,impact loads or temperature conditionsare involved.

Ball bearing flanged blocks consist ofsingle row, deep groove, self-aligningball bearings, which are effectivelysealed, mounted in one-piece gray ironhousings. Spring locking collars withtwo set screws hold the bearings firmlyon the shafts.

Trough end seal

Internal mountingseal gland

Ball bearingFlanged block



Troughs

The trough not only confines and guides the flowof material, but also serves as the housing inwhich all operating components are supported andheld together in their proper functionalrelationship. Accuracy in manufacturing andinherent strength to maintain this accuracy aretherefore, essential.

Link-Belt® designs, and manufacturing methods,are constantly being improved to provide thesequalities to the fullest extent while at the sametime affecting economies in weight and spacerequirements.

Flanged trough - By forming the top flangesintegrally with the trough sides from a single steelsheet, adequate strength and rigidity is obtainedwithout superfluous bulk or weight. Steelconnecting flanges, securely welded at each endin special welding fixtures to assure square, trueends, facilitate assembly, insure proper alignmentand preserve the contour of the trough.

Angle Flanged trough - This trough is identical inconstruction to the flanged trough, except that topflanges are obtained by securely weldingstructural steel angles to the trough.

Flared trough - This trough is of conventionalconstruction except that trough sides are flaredoutward to afford a wider top opening. This resultsin improved feed and conveying action with stickymaterials or materials which are not entirely freeflowing. It is customarily used with ribbon flightconveyor screws.

Corrosive or high temperature applications mayrequire the specific qualities that make stainlesssteel and non-ferrous metals well adapted to theseservices. In general, any type of trough that can befabricated of mild steel can also be made ofstainless steel or aluminum, brass, bronze, copper,Monel metal, nickel, etc. For resistance tocorrosion there are numerous protective coatingsthat are applied to steel troughs and covers.Galvanizing, tinning, chrome plating, etc., are alleffective for certain applications. Vulcanized orbonded rubber coatings resist abrasion andcorrosion.

Flanged trough

Angle flanged trough

Flared trough

17


Troughs

Drop bottom troughs are equipped with a dropbottom usually hinged, held in place by springclamps of various types for ready access to troughinterior, conveyor screws and hangers.

This design facilitates quick, thorough, andfrequent cleaning of the trough, screw and otherparts and is particularly useful to combatinfestation and promote sanitation.

Channel side troughs are made with separatedetachable trough bottoms, bolted or clamped toformed or rolled steel channels. The channels maybe of any reasonable length to span widely spacedsupports. Trough bottoms are made in lengths upto 12 feet.

This trough is occasionally selected for ease ofreplacement of trough bottoms subject tounusually severe abrasive or corrosive wear.

Trough SupportSupporting feet are of formed steel for use withend flanges and provide a convenient means ofaligning and supporting conveyors from floors, andsupporting structures.

Supporting saddles are used when locatio n ofsupport points does not coincide with the spacingof joint flanges or when troughs with buttstrapped connections are used. Support saddle

Support feet

Channel side trough

Drop bottom trough



18

Trough Covers

Covers are used for protection of operatingpersonnel, dust control or protection for oragainst the material being handled. Whenrequired, protective seals can be furnished.

Plain covers consist of flat steel sheets and can befurnished with spring clamps, screw clamps orbolts.

Semiflanged covers are flanged 30 degrees alongthe sides and provided with spring clampsattached to the top side of the cover These coverscan also be furnished with screw clamps or bolts.

Flanged covers have right angle flanges along thesides to provide a stiffer cover for moreconvenient handling. They are normally attachedto the trough with screw clamps or bolts.

Hip Roof covers are peaked to form a longitudinalridge. They are normally furnished for use inoutdoor applications because of their ability toshed water.

Shrouds are used in U-trough sections of screwfeeders to decrease the clearance between thecover and feeder screw to obtain proper feedregulation.

between the covers and troughs. Covers are madein three general types: plain, semi-flanged andflanged.

Plain Cover

Semiflanged Cover

Flanged Cover

Shroud

19


Trough Discharge Spouts and Gates

Discharge spouts and gates afford the means fordischarging material from the trough and for connectionto succeeding equipment to which material is delivered.Gates provide for selective control of multiple spouts.

All spouts and gates are of welded steel construction withconnecting flanges punched with accurately spaced holesfor interchangeability and ease of assembly.

Spouts and gates can be fabricated of stainless steel andnonferrous metals. Spouts of special design can befurnished to accommodate unusual conditions.

Plain discharge openings are cut in the bottom of thetrough at the desired location to provide free discharge ofmaterial. They are used for delivering to open or closedstorage or similar applications.

Discharge Spouts are welded in place when furnished witha complete conveyor. They are furnished in thicknessesproportioned for the size and thickness of trough.

Flush end discharge spouts are furnished welded in placeon flanged or angle flanged trough. They are furnished inthicknesses proportioned for the size and thickness of thetrough.

Hand Slide Gates are made to attach to discharge spoutsand can be operated from any one of the four sides,provided there is sufficient clearance for the gate in itsopen position.

Rack and Pinion slide gates have cut tooth racks weldedto the side-plates and actuated by cut tooth pinionsmounted on pinion shafts operated by hand wheels orchain wheels. These are available with either flat slideplates or curved slide plates.

Air Operated gates are high quality units designed forlow-friction performance in applications requiringfrequent gate operation. These gates are built to accept aflange-faced air cylinder and have a roller mounted slideplate operating in a formed steel housing. The cylindercan be furnished with the gate or supplied by the user forfield installation. No air piping or controls are providedwith these gates.

Slide gates, either hand or rack and pinion operated,may be installed in practically all applications foroperation either parallel or at right angles to takeconveyor axis. Rack and pinion operated gates may befurnished with chain wheels and chains for remotecontrol. Pinion shafts may be extended toaccommodate various operating arrangements.

Plain dischargeopening

Discharge Spout

Flush end discharge spout

Rack and pinioncurved slide gate

Rack and pinionflat slide gate


Technical Data

The Link-Belt® screw conveyor layout,engineering and component selectioninformation in this section is provided toassist you in the selection of the properconveyor components for your particularmaterial handling requirement. It has beencompiled during the many years ofexperience designing numerous and variedscrew conveyor installations, and includesdetailed information on all Link-Belt®standard screw conveyor components andaccessories.

The data and formulas presented permiteasy selection of the necessarycomponents for handling materials undernormal operating conditions by horizontalscrew conveyors and screw feeders.

Where unusual applications or severeoperating conditions are a factor or wherethere is doubt concerning the correctselection, contact Syntron MaterialHandling, Tupelo, MS to assist you withadditional information.

CAUTION: Link-Belt® Screw Conveyors and components must beinstalled, operated and maintained inaccordance with accompanying SyntronMaterial Handling Service Instructions.Failure to follow these instructions canresult in serious personal injury, propertydamage or both.

Syntron Material Handling ServiceInstructions accompany the shipment ofequipment. If additional copies of ServiceInstructions are required, they are available free of charge from Syntron Material Handling Corporation,Conveyor Equipment Division,Box 1370, Tupelo, Mississippi 38802.

layout information

21

Layout Data Use the conveyor layout on page 22 whenselecting components. This layout is basedon using regular, or odd length screws andtroughs at the tail end of the conveyor andregular length screws and troughs for thedrive and intermediate sections. Hangersare located at the trough joints.

The drive shafts that provide a nominalclearance between the ends of theconveyor screws and the trough end aredesignated as Type A shafts.

The drive and tall end shafts that are longenough to permit a clearance between theends of the conveyor screws and thetrough ends equal to approximately one-half the hanger bearing length aredesignated as Type B shafts.

Conveyor screws • Regular and half lengthconveyor screws, listed in Table 1 on page22, should be used to obtain the requiredtotal screw length. The face of the screw,which moves the material being conveyed,is free of lugs for unimpeded flow. Tomaintain this condition, do not reverserotation without turning the conveyorscrews end for end, or conversely, do notturn the conveyor screws end for endwithout reversing rotation. Conveyorscrews for reversible operation can befurnished for specific requirements.Flighting should be omitted over the lastdischarge opening. Flight ends at hangerlocations should be set opposite to eachother for continuous flow of materialacross the hanger space.

Selection of hand of screw • Refer toFigure A for selection of right or left handconveyor screws. This drawing indicatesthe hand of conveyor screw to use whendirection of rotation and material travelare known. If the edge of the flight on thenear side of the conveyor screw slopesdownward to the right, the conveyor screwis right hand, and if it slopes downward tothe left, the conveyor screw is left hand.

Figure A


layout information

Screw Conveyors Screw conveyors are made witheither helicoid or sectionalflighting of various thicknesses ina wide range of sizes in bothright-hand and left-hand

assemblies. The conveyor screwsand troughs are made in regularlengths, but can also be furnishedin odd lengths to suitrequirements.

23

layout information

Hangers - Hangers are locatedbetween conveyor screw sections. No. 216, 220, 226, 270, 316 and 326hangers are located at trough joints inFigure B, page 22. All hangers shouldclear inlet and discharge openings.

Trough ends - The drive shaft or endshaft, depending on the direction ofmaterial travel, should have a thrustbearing to maintain clearancebetween the conveyor screws andhangers, and the conveyor screws andtrough ends. This prevents excessivewear of operating parts and reducespower consumption. The preferredlocation for the thrust bearing is at theend of the conveyor, because theconveyor pipes and couplings willthen be in tension during operation.

Drive shaft trough ends of either thedouble ball bearing or double rollerbearing type will accommodate radialloads and thrust loads in eitherdirection. The radial or overhung loadusually consists of a shaft-mountedspeed reducer drive or a chain driveconnected to a power source.

Plain trough ends require auxiliary endthrust provision. Depending upon thedirection of the thrust, either the driveor end shaft should have a bronzethrust bearing.

Seals - Trough end seals are used foradditional protection for or against thematerial being handled, or to protectand preserve the trough end bearings

and shafts when handling abrasive orcorrosive materials.

Troughs - Regular and half lengthtroughs, listed in Table 1, page 22,should be used to obtain the requiredtotal trough length. Wheneverpossible, supporting feet should beused at the trough joints, otherwise,use saddles as needed. Supportingfeet located at the ends of theconveyor will allow removal of thetrough ends without disturbing troughalignment.

Covers - Covers are made with jointslocated at the hangers. Protectiveseals between the troughs and coversare easily applied when No. 216, 226,270, 316, and 326 hangers are used.Inlet openings in the covers shouldclear hangers.

Drives - Drives should preferably belocated at the discharge end of theconveyor in order to keep theconveyor screws and couplings intension.

Assembly Bolts - Table 2 provides aguide to the quantities and sizes ofbolts required to assemble a screwconveyor. Bolts are listed for each typeof hanger, for each shroud, for eachtrough joint or trough end, and for 10foot and 12 foot long sections ofbolted cover.

Assembly bolts for No. 316 and No.326 hangers are furnished with hangerassemblies.

Screw ConveyorsMany bulk materials are handledeasily and efficiently in screwconveyors. However, to insure the bestpossible selection of components, it isrecommended that consideration begiven to the physical, chemical andhandling characteristics of allmaterials.

The essential characteristics includesize, flowability and abrasiveness ofthe materials. Other characteristics,such as contamination, corrosiveness,degradability, fluffiness, etc., mayinfluence the handling and should begiven consideration. Considerationshould also be given to materialswhich may assume differentcharacteristics under certainconditions of processing, atmosphere,age or storage. Many of the morecommon materials are classified in the Material Characteristics Table 4,pages 26 thru 34, and are given as aguide in selecting the propercomponents. Materials not appearingin the list can be classified bycomparison with similar materials orby establishing a classification usingthe Material Classification Code ChartTable 3, page 25.

The delivery of material to a screwconveyor must be at a controlled andfairly uniform rate.

(1) Four bolts(2) Six bolts(3) Eight bolts

(4) Ten bolts(5) Twelve bolts(6) Fourteen bolts

(7) Sixteen bolts(8) Eighteen bolts(9) Twenty bolts

(10) Eight bolts for U-Trough & ten bolts for Flared Trough


layout information

Special applicationsOccasionally the characteristics of thematerial being handled are such that otherthan conventional or regular equipment isrequired for the purpose, such as:

1. When the materials are extremely hot, the screws and troughs maybe made of high temperaturealloy metals.

2. If the materials are sticky or viscous, ribbon flight conveyor screws may be the choice. Furthermore, special coatings applied to the screws and troughs may also aid the flow ofthe material.

3. Extremely abrasive materials may require screws and troughs made of abrasion resistant metals or the screws may be provided with hard surfaced flights.

4. When the materials are corrosive, it may be desirable to make the

conveyor screws and troughs of stainless steel, Monel metal, nickel, aluminum, etc.

5. If the materials are to be mixed or aerated, a conveyor screw of ribbon flights or cut flights, or one of these combined with paddles may be used to obtain the desired results.

6. Materials which are to be heated or cooled may require jacketed troughs arranged for circulating heating or cooling media.

7. Contaminable materials may require self-lubricated bearings and screw and trough construction which will eliminate pockets, cracks, etc. Such screws and troughs will prevent the accumulation of the material and facilitate easy cleaning.

How to select a horizontalscrew conveyorConsider the following factorswhen selecting a horizontal screwconveyor:

Kind and character of materialbeing handled, such as: size,flowability, abrasiveness, etc.

Weight of material in pounds percubic foot.

Maximum rate at which materialis handled in cubic feet per hour.

Maximum size of lumps in inches,average size of material andpercentage of lumps in totalvolume.

Length of conveyor in feet.

25

material classification

Preface to Material Table

The Material Characteristics Table 4lists a wide range of bulk materialsthat can be handled in screwconveyors. The table shows the firstcolumn the range of density that canbe experienced in handling thatmaterial. The "as conveyed" density isnot specifically shown but is oftenassumed to be at or near the minimum.

The next column shows the materialcode number. This consists of theaverage density, the usual sizedesignation, the flowability number,the abrasive number followed by thosematerial characteristics which aretermed conveyability hazards.

The component series column refers toselection of conveyor components asused in Tables 9, 10, 11, & 12 onpages 39 and 40.

A very fine 100 mesh material with anaverage density of 50 lbs. per cubicfoot that has average flowability and ismoderately abrasive would have amaterial code 50A10036. If this materialwas very dusty and mildly corrosivethe number would be 50 A10036LT.

The Material Factor is used in thehorsepower formula to determine thehorsepower to operate a horizontalscrew conveyor. The calculation ofhorsepower is described on page 41.

The Material Characteristics Table is aguide only. The material code, and thematerial factor Fm are based onexperience. A specific material samplemay have properties that vary fromthose shown in the table. The range ofdensities will also vary depending onmoisture content as well as its source.



(1)Consult Syntron Material Handling

27






28

29


31



33



35

engineering information

Selection of Conveyor Size and SpeedIn order to determine the size andspeed of a screw conveyor, It isnecessary first to establish thematerial code number. It will be seenfrom what follows that this codenumber controls the cross-sectionalloading that should be used.

The various cross-sectional loadingsshown in the Screw ConveyorCapacity Table 5 are for use with thestandard screw conveyor componentsindicated in the Component GroupSelection Guide Table 8 on page 38,and are for the usual screw conveyorapplications. The usual screwconveyor applications may be definedas those in industrial use where theconveying operation is controlled withvolumetric feeders and where thematerial is uniformly fed into theconveyor housing and dischargedfrom it.

Check lump size limitations beforechoosing conveyor diameter. SeeTable 7, page 37.

Capacity TableThe Capacity Table 5 gives thecapacities in cubic feet per hour atone revolution per minute for varioussized screw conveyors for four cross-sectional loadings and for variousclasses of materials as delineated bycode numbers. Also shown arecapacities in cubic feet per hour at themaximum recommended revolutionsper minute.

Conveyor SpeedFor screw conveyors with screwshaving regular helical flights all ofstandard pitch, the conveyor speedmay be calculated by the formula:

Required capacity cubic feet per hour

N = Cubic feet per hour at 1 revolution per minute

where

revolutions per minute of screw,N = but not greater than the

maximum recommended speed.

For the calculation of conveyorspeeds where special types of screwsare used, such as short pitch screws,cut flights, cut and folded flights andribbon flights, an equivalent requiredcapacity must be used, based onfactors in Table 6, page 36.

Factor CF, relates to the pitch of thescrew. Factor CF2 relates to the typeof the flight. Factor CF3 relates to

the use of mixing paddles within theflight pitches.

The equivalent capacity then is foundby multiplying the required capacityby one or more of the capacity factorsthat are involved. See Table 6, page36, for capacity factors.

CE = Equiv. Capacity = Required Capacity (CF1) (CF2) (CF3)cubic feet per hour cubic feet per hour

*For capacities of inclined screw conveyors, contact Syntron Material Handling.


Lump Size LimitationsThe size of a screw conveyor not onlydepends on the capacity required, butalso on the size and proportion oflumps in the material to be handled.The size of a lump is the maximumdimension it has. A closer definition ofthe lump size would be the diameterof a ring thru which the lump wouldpass. However, if a lump has onedimension much longer than itstransverse cross-section, the longdimension or length would determinethe lump size.

The character of the lump also Isinvolved, Some materials have hardlumps that won't break up in transitthrough a screw conveyor. In that caseprovision must be made to handle theselumps. Other materials may have lumpsthat are fairly hard, but degradable intransit through the screw conveyor, thusreally reducing the lump size to behandled. Still other materials havelumps that are easily broken in a screwconveyor and lumps of these materialsimpose no limitations.

Three classes of lump sizes apply as follows:

Class 1 A mixture of lumpsand fines in whichnot more than 10% are lumps rangingfrom maximum size to one half of themaximum; and 90% are lumps smallerthan one half of the maximum size.

Class 2 A mixture of lumps and fines inwhich not more than 25%, are lumpsranging from the maximum size toone half of the maximum; and 75%are lumps smaller than one half ofthe maximum size.

Class 3 A mixture of lumps only in which 95%or more are lumps ranging frommaximum size to one half of themaximum size; and 5% or less arelumps less than one tenth of themaximum size.

Table 7, page 37 shows therecommended maximum lump size foreach customary screw diameter andthe three lump classes. The ratio, R, isincluded to show the average factorused for the normal screw diameterswhich then may be used as a guide forspecial screw sizes and constructions. For example:

Radial Clearance, inchesRatio, R = Lump Size, inches

This ratio applies to such unusual casesas screws 16 inches diameter mountedon 2 inch solid shafts; or 12 inchdiameter screws mounted on 6 inchdiameter pipes (the large pipe serving toreduce deflection of the screw).

The allowable size of a lump in ascrew conveyor Is a function of theradial clearance between the outsidediameter of the central pipe and theradius of the inside of the screwtrough, as well as the proportion oflumps in the mix. The followingillustration illustrates thisrelationship.



To illustrate the choice of screw size fromTable 7, say the material is ice withMaterial Characteristic code number D15,35 to 45 lbs. per cubic foot and with sizedistribution as follows:

4"x2," 9% 2"x1," 41% 1"x3/8," 22% minus 3/8," 28%.

This lump size distribution falls underClass 1. From Table 7, the ratio R is1.75 and the radial clearance (4) (1.75)or 7 inches. This calls for an 18 inchdiameter screw.

Component Groups To facilitate the selection of properspecifications for a screw conveyor fora particular duty, screw conveyors arebroken down into three ComponentGroups. These groups relate both tothe Material Classification Code andalso to screw, pipe size, type ofbearings and trough thickness.

If the material to be conveyed is notlisted in Table 4, pages 26 thru 34,then its Classification code may bedetermined from Table 3, page 25.

Table 8 is a guide to the properselection of the appropriateComponent Group. It will be observedthat in addition to the flowcharacteristics of a material,consideration must be given to thematerial size, its abrasiveness and itscorrosiveness as these determineconstruction details.

For example, if the material hassuitable flow characteristics, is of aclassification Code Size B, has anabrasive number of 5 and is non-corrosive, the Component GroupNumber is 1. If babbitted or bronzebearings, 1A; or for balI bearings, 1C. Itwill be noted that if the material is atall corrosive, ball bearings are notrecommended.

Having made the Component Groupselection, refer to Tables 9, 10 and 11,pages 39 and 40, which give thespecifications of the various sizes ofconveyor screws. The tabulated screwnumbers in this table refer to CEMAStandard No. 300 on Screw Conveyors.This standard gives complete data onthe screws such as the length ofstandard sections, minimum edgethickness of screw flight, bushing data,bolt size, bolt spacing, etc.

37



(1)For very corrosive conditions (codes 6S or 7S) lighter gauge special anti-corrosion materials maybe used.

(2)Ball bearings are not usually recommended for conveyors handling materials partly or whollyfinely ground. (Code A)

(3)Any abrasive material which is flammable, corrosive, or which may contain explosive dust, consultmanufacturer for bearing recommendations,

Conveyor screw speeds must beconsidered when using hard ironbearings on hardened coupling shaftsin order to minimize wear and toreduce the squealing noise of drymetal on metal. The following formulagives maximum recommendedoperating speed:

120N = Shaft diameter in inches

where

N = Maximum operating rpm of screw

For bearing types A, B and C listedabove, the shafting used for thecouplings is AISI C1018 standard coldrolled steel or equal.

For hard iron bearings, the shaftingfor the couplings is usually mediumcarbon steel AISI 1045 and surfacehardened. Suitably hardened alloyshafting also may be used.

39


Component Groups


41

Horsepower Requirements,Horizontal Screw ConveyorsThe horsepower required to operate ahorizontal screw conveyor is based onproper installation, uniform and regularfeed rate to the conveyor and otherdesign criteria as determined in thiscatalog.

The following factors determine thehorsepower requirement of a screwconveyor operating under the foregoingconditions.

CE Equivalent capacity in cubic feet per hour.

e Drive efficiency.Fb Hanger bearing factor. See

Table13.Fd Conveyor diameter factor See

Table 14, page 42.Fm Material factor. See Table 4,

pages 26 thru 34.Fo Overload factor See Figure D,

Page 42.L Total length of conveyor, feet.N Operating speed, rpm.W Apparent density of the

material AS CONVEYED, lbs. per cubic foot. See Table 4, page 26 thru 34.

The horsepower requirement is thetotal of the horsepower to overcomeconveyor friction (HPf) and thehorsepower to transport the material atthe specified rate (HPm) multiplied bythe overload factor Fo and divided bythe total drive efficiency e, or:

LN Fd FbHPf = 1,000,000

CELWFmHPm = _ 1,000,000

(HPf + HPm) FoMotor HP = _________________e

or use Figure E, page 42, where HPt =(HPf + H Pm).

It is generally accepted practice that allpower transmitting elements of a screwconveyor be sized and selected tohandle safely the full load motortorque. If, for example, a screwconveyor requires 3.5 horsepower asdetermined by the horsepower formula,

a 5 hp motor must be used and allpower transmitting elements must becapable of safely handling the full 5horsepower.

ProblemMaterial . . . . . . . . . . Vermiculate OreWeight . . . . . . . . . . 75-85 1 lbs/ft3

Capacity . . . . . . . . . . 1200 ft3/hrMax. Lump. . . . . . . . 1"Length of Conveyor 31'-0"

Refer to Table 4, pages 26 thru 34. Thematerial class is 80D336. Thecomponent series is 2D and thematerial factor Fm is 1.0

Refer to Table 5, page 35, and select a16" diameter conveyor @ 30% loadingcapable of 1400 ft3/hr at a max. speedof 45 rpm. Capacity of unit is 31.2 ft3/hrat 1 rpm.

120N = ____ = 40 rpm; 39 rpm satisfactory3

LN Fd Fb 31 x 39 x 106 x 4.4HPf = ___________ = _ = 0.561,000,000 1,000,000

CE LW Fm 1200 x 31 x 85 x 1.0HPm = ___________= _ = 3.161,000,000 1,000,000

(HPf + HPm)x Fo (0.56 + 3.16)1.21MHP = ________________ = = 5.28 use 71/2e .85

or use Figure E, page 42, HP1 = 0.56 +3.16 = 3.72 Use 7 1/2 hp.

HP x 63,025 7.5 x 63,025Torque = ______________ T = ______________ T = 12,120 in. lb.N 39

Table 15, page 43, indicates a 2-bolt connection is rated 16,400 in. lb.

=

==

=

=

=

===

1200Required speed = ______31.2 =38.46call 39 rpm.

Table 8, page 38, indicates a hard ironhanger bearing.

Component series 2D indicates HeavyService Table 10, page 39.

16H614 helicoid screw flight - 3"diameter shaft 3/16 "trough and 14 ga.cover.

Max. speed for 3" diameter shaft usinghard iron bearings.



42

Factor F0 and A Drive Efficiency of 85% Are included.

Figure E

43


Torsional Ratings of Conveyor Screw PartsScrew conveyors are limited in overalllength by the amount of torque thatcan be safely transmitted through thepipes and couplings.

Table 15 combines the varioustorsional ratings of bolts, couplingsand pipes so that it is easy to comparethe torsional ratings of all the stressedparts of standard conveyor screws. Thetable conforms to the CEMA ScrewConveyor Standard No. 300. Thetorsional values are confined to thesizes listed in that standard.

The lowest torsional rating figure forany given size of coupling will be theone that governs how muchhorsepower may be safely transmitted.For example, using standardunhardened two bolt coupling shafts,the limiting torsional length of eachpart is indicated in Table 15.

Thus it can be seen that the shaft itselfis the limiting factor on 1," 11/2," and 2"couplings. The bolts in shear are thelimiting factors on the 27/16," couplingand on the 3" coupling used inconjunction with 4" pipe. The bolts inbearing are the limiting factors for the3" coupling used in conjunction with31/2" pipe, and for the 3/16" coupling.

63025 x HPTorque, TQ = _____________rpm

If coupling bolt shear is the limitingtorsional rating, high strength boltsmay be substituted. When using highstrength bolts the limiting factor will,in all cases, be either the couplingshaft or the bearing value, and bothmust be checked.

Screw Conveyor End ThrustMost screw conveyors can be designedwith little thought given to thrust asthe thrust force in an ordinary screwconveyor is moderate and commonlyused screw conveyor drives willaccommodate thrust in either direction.However, in screw feeders with longinlet openings and in screws used tocompress material (either by design orby accident when discharge openingsare plugged) thrust forces can be verysevere. Severe thrust forces can stripthe flights from the pipe, stall the drive,result in sheared coupling bolts orfractured couplings and shaft.

The direction of thrust in a screwconveyor or feeder is opposite to thedirection of flow of the product. It ispreferred to accommodate the thrustat the discharge end as this results inthe line of screws and couplings beingin tension.

The most common drives in use todayare the so-called screw conveyor drivesthat are adaptations of shaft mountedreducers. These include drive shaftsthat are secured in the reducer so as totake thrust in either direction andtransfer the thrust force to one of thehollow shaft bearings of the reducer.



CONVEYOR SCREW DEFLECTIONDeflections of conveyor screws ofstandard lengths not usually aproblem. However, if longer thanstandard sections of screw are to beused, without intermediate hangerbearings, care should be taken toprevent the screw flights fromcontacting the trough because ofexcessive deflection. The nomographon page 45 indicates the deflection ofstandard helicold conveyor screwsections on schedule 40 and schedule80 pipe, for various lengths of screwsections. The schedule 80 pipe may beneeded for large torques.

Applications of screw conveyors inwhich the deflection of the screwexceeds 0.25 inches should bereferred to the screw conveyormanufacturer for recommendations. (Insome applications, a deflection ofeven less than 0.25 inches could becritical and should be referred to themanufacturer.) Very often the problemcan be solved by using a conveyorscrew section with a larger diameterpipe. It will be noted from thenomograph that the use of a schedule80 pipe reduces the deflection verylittle, hence it isn't practical to reducedeflections by using heavier pipe.Larger diameter pipe should be used.

Example NO. 1Determine the deflection of a 12H512conveyor screw section mounted on aschedule 40 pipe, with an overallunsupported length of 18 feet. Fromthe nomographic chart, Figure 3.6, thedeflection is greater than 0.25 inch,and therefore indicates that theproblem should be referred to thescrew conveyor manufacturer forsolution.

When the flights of the screw aremounted on something other thanSchedule 40 or Schedule 80 steel pipe,such as mechanically drawn tubing orsolid shafting or steel or other metals,the deflection at mid span may becalculated from the following formula:

5 WL3

s= _______384 El

where:

s deflection at mid span, inchesW total weight of screw, lbs.L Length of screw between

bearings, inchesE modulus of elasticity for steelI moment of inertia of hollow or

solid shaft section.

Example NO. 2 Determine deflection of a 12H614conveyor screw 20 ft. long. Accordingto manufacturers' catalogues it has aweight of 228 lbs. for an 11’-9’’ longsection and has helicoid flightingmounted on 31/2" schedule 40 ironpipe size.

228W = x 20 = 388 lbs.11.75

L = 20 X 12 - 240", L3 = 13.8 X 106

E = 30 X 106I = 4.79 (31/2" schedule 40 pipe)

(5) (388) (13-8) (10)6s = _______________________ = 0.48(384) (30) (10)6 (4.79)

The 0.48 inch deflection is greaterthan the 0.25 inch normallyallowable deflection. Therefore, alarger diameter pipe or othersection having a higher moment ofinertia may be tried.

The nomograph on Page 45 willsolve some examples of conveyorslonger than usual or longer thanstandard lengths.

===

==



Screw FeedersThis section relates to screw feedersthat are used to control the rate offlow of a bulk material from a bin orhopper. This is limited to the handlingof bulk free flowing materials lessthan 1/8" in size and which areclassified as abrasive 5 or 6 as shown in Table 3,page 25.

In screw feeders, the inlet portion ofthe trough is made to be flooded withthe material and by means of a shroudin the trough, or by the use of atubular trough, only a controlledamount is carried to the discharge.

The screws in the feeder are arrangedin several different ways, dependingupon circumstances. For relatively smallinlet openings, the screw often has astandard diameter and pitch.Frequently, however the screw istapered in diameter with its smallestdiameter at the extreme feed end.Screws also may be made with aconstant standard diameter and avariable pitch, the pitch growing largerfrom the extreme feed end. Thepurpose of the tapered diameter orvariable pitch screw is to obtain aneven flow from all areas of the feedopening. The capacity of tapered screwsor variable pitch screws is determinedby the diameter and pitch at thedownstream end of the inlet opening.

Several factors should be establishedbefore selecting a screw feeder, thesebeing:

A. Kind and character of material being handled.

B. Density of material as conveyed,lbs/ft3.

C. Maximum rate at which material isto be handled, ft3/hr.

D. Size consist or screen size analysis.

E. Overall length of feeder, or feederwith extended conveyor, feet.

F. Width and length of inlet opening.

Single screw feeders are mostcommonly used. However, if the inletopening is very wide, multiple screwfeeders are more practical.

Single Screw FeedersThe single screw feeder may be aseparate unit, or it may be extendedby sections of normal screw conveyorto any practical length. The procedureby which to choose a single screwfeeder is as follows:

Refer to Material Classification Code,Table 3, page 25, and the MaterialCharacteristics, Table 4, pages 26 thru34. Determine the material code classand density from Table 4.

Capacity and SpeedFrom Table 16, under the columncaptioned at maximum rpm, find thecapacity which equals or exceeds thedesired feeder capacity. Then find fromthat the feeder diameter and capacityat one rpm or C,. Divide the required

feeder capacity by C, to obtain therequired speed in rpm.

CN =

Ct

where:

N = Speed of feeder in rpm.

C = Required capacity of feeder,ft3/hr.

C1 = Capacity at one rpm, ft3/hr.

This maximum rpm is not absolutebut has been selected as generalrecommended practice. Experiencewith a particular set of conditions, orapplication, may establish slightlydifferent design limitations. Manyfactors including bin or hopper design,a subject not covered here, willsignificantly affect screw feederperformance.

Single Screw Feeder ArrangementThe arrangement and dimensionaldata for single screw feeders areshown in Figure F, page 47, andTable 16.

Extension ConveyorThe arrangement of an extensionconveyor, directly connected to asingle screw feeder, is shown inFigure G, page 47. Obviously theextension conveyor must operate atthe same rpm as the feeder. The sizeof the extension conveyor may beobtained by referring to Table 5,page 35. For the code class of thematerial to be handled find a screwdiameter which will give an equal orgreater capacity in cubic feet perhour at one rpm than the C, capacityof the screw feeder used in theformula to determine the feederspeed. The degree of trough loadingcorresponding to the code class ofmaterial to be handled and itsabrasiveness, must not be exceeded.

(1)Dimensions are typical and approximate. Actual dimensionsshould be certified for installation purposes.

(2)Based on 100% of theoretical capacity with standard pitchand screw pipe. For nonstandard pitch or pipe size consultscrew conveyor manufacturer.

(3 )Maximum in regular construction. Larger inlet openingsrequire engineering consideration not covered here.

(4)The length C is equal to two standard pitches.

47


Power RequiredThe calculation of the requiredhorsepower to operate screw feeders isvery similar to that involved forstandard screw conveyors. Essentially,the calculation involves the addition oftwo horsepowers, one for empty feederfriction, and the other the materialfriction.

Horsepower for Single Screw Feeder:(HPa + HPb)FoHP = _______________

e

Horsepower for Single Screw Feederwith Extension Conveyor:

1(HRa + HPb + HP1 + HPm) FoHP = _____________________________e

Where: Empty Feeder Friction Power

L1 N Fd FbHPa = ____________1,000,000

Feeder Material Friction Power

C W Lf FmHPb = ____________1,000,000

and Empty Extension Conveyor FrictionPower

L N Fd FbHPf = ___________1,000,000

Extension Conveyor Material FrictionPower

C W L FmHPm = ___________1,000,000

and the nomenclature used is defined:

C = Capacity in ft3/hr.

W = Apparent density of materials asconveyed, lbs/ft3

L = Length of extension conveyor, feet.

Lf = Equivalent length of feeder, feet.See Table 17, page 48, for methodof arriving at values of L1.

L l = Length of feeder, feet, asshown in Figures F and G.

N = Speed of screw rotation, rpm.

Fb = Hanger bearing factor,Table 13, page 41.

Fd = Conveyor diameter factor,Table 14, page 42.

Fm = Material factor, Table 4,pages 26 thru 34.

Fo = Overload factor, Figure 14,page 42.

e = Efficiency of the drive selected.

Single Screw FeederFigure F

Single Screw Feeder With Extention ConveyorFigure G



Example ofSingle Screw Feeder SelectionProblem:Select a single screw feeder withoutextension conveyor for the followingconditions

Material to be handled Salt cake,dry,pulverized

Weight per cubic foot 65-85 lbs

per ft3

Capacity 26 tons(2000lb) perhour = 800cubic feetper hour

Length of feeder, L1 10 feet

Inlet opening 40incheslong, 10inches wide

Required is an even rate of flow alongthe whole inlet opening.

Solution:(a) From table 4, pages 26 thru 34, salt

cake is code classified at 75 B636 TUhas a component group designationof 3-D and a material factor (Fm,) of1.7.

(b) From Table 13, page 41, for aComponent Group D, the hangerbearing factor, Fb = 1.0. Since thisexample does not have a hanger,Fb = 1.0. Use the appropriate factorwhen a hanger bearing or a tailbearing that utilizes a hanger inserttype bearing is used.

(c) To be prudent, for capacitycalculations use the lowestapparent density, 65 lbs/ft3.Thenthe volume for 26 tons per hour is

(26) (2000) ________ =65

800 ft3/hr required feed rate.

(d) Referring to Table 16, page 46, a 9-inch diameter single screw feederwill handle 1202 ft3/hr at a maximumof 65 rpm and C1 =18.5 at one rpm.Using the formula for speed.

C 800N = __ = ____ = 43.2 rpmCf 18.5

(e) From Table 17, the equivalentlength of the feeder is

B CL1 + ____ + ____ in which6 12

B 40L1 = 10, _____ = _____ or 6.7, and6 6

C (18)____ = _____ = 1.512 12

Lf = 10 + 6.7 + 1.5 + 18.2 feet

(f) From Table 14, page 42, the “conveyor diameter factor Fd = 31.

(g) Again to be prudent, for powercalculations it is well to use thelargest apparent density forW, so W = 85 lbs/ft3.

L1 N Fd Fb(h) HPa = ______________ =1,000,000

(10) (43.2) (31) (1.0)______________________ = .013 HP1,000,000

C W Lf Fm(i) HPb = ______________ =1,000,000

(800) (85) (21.5) (1.7)______________________ = 2.10 HP1,000,000

(j) Referring to Figure D, page 42, thefactor Fo depends upon the sum of thehorsepower for friction of the emptyconveyor (feeder in the example) andthe horsepower of

(HPa + HPb) FoHP = _______________ =e

(.013 + 2.10) (1.57)_____________________ = 3.90 HP.085

material friction. In this example thissum is .059 + 2.10 = 2.113 HP and Fo =1.57.

(k) Then assuming a drive efficiency(expressed decimally) of 0.85,

Or use Figure E, page 42 HPt = (HPa + HPb) = 2.159 MHP = 5

(1) Use a 5 hp electric motor withspeed reduction to 43.2 rpm.

The theoretical estimated powerrequirements calculated in theforegoing example conceivably couldbe exceeded to the extent that the full5 horsepower of the motor would beused. Therefore, all components of thepower train, the feeder shaft, thescrew pipe shaft and the screw itselfshould be capable of withstanding-atthe speeds involved for each-thetorsion force or torque of full 5horsepower. See Table 15, page 43 for torsional capacities of screwconveyor components.

Effect of Material Loads on ScrewIn many cases, where screw feeders aremounted at the bottoms of bins orhoppers, the screw has to perform itsfunction under heavy loads of materialabove the bin opening or feeder inlet.Under certain conditions and withcertain materials the start-up torquecan be very high, resulting in biggerdrives and heavier feeder components.

An alternative solution is the use ofmultiple screw feeders. Multiple screwfeeders may consist of twin, triple, orquadruple screws, side by side to feedmaterials from very wide inlet openings.

49


Conveyor Designation SystemScrew diameter & pitch12- = Full Pitch12-8 = 2/3 pitch12-6 = 1/2 pitch12-4 = 1/3 pitch

Coupling diameter3 = 11/2"4 = 2"5 = 2 7/16"6 = 3"7 = 3 7/16"

E = Standard LengthEF = RightingF = Flight

Type ConveyorH = HelicoidHR = Helicold ribbonHS = Hellcoid stainlessHSR = Helicold stainless ribbonS = SectionalSIR = Sectional ribbonSS = Sectional stainlessSSR = Sectional stainless ribbonNOTE: Q prefix on all above types for Quik-Link.

Flight thicknessat outer edge 1/64" increments


component selection

Helicold Flight Conveyor Screws are made of a continuous one-piece helixfastened to a pipe with spaced intermittent welds. Steel lugs are welded topipe and flight at both ends, except on 4-inch size.

Helicoid Flight Conveyor Screw

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component selection

Helicoid Flight

Helicold Flighting is manufactured in a continuous one-piece helix of thedesired diameter, pitch and thickness. The helicold flight is tapered in crosssection, with the thickness at the inner edge about twice the thickness atthe outer edge,

component selection

Sectional Flight Conveyor Screws consist ofindividual flights formed into a helix. then buttwelded together and fastened to a pipe or shaftwith spaced intermittent welds, Steel lugs arewelded to pipe and flight at both ends, excepton regular sectional flight screw sizes largerthan 16-inch diameter. Both ends of the pipehave permanent internal collars with insidediameters to accept couplings, drive shafts orend shafts.

Sectional Flight Conveyor Screw Sectional Flight


component selection

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component selection

Sectional Flights are individual flights formed into a spiral or helix of thedesired diameter and pitch, butt welded together to form a continuous conveyorscrew.

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component selection


component selection

Ribbon flight conveyor screws consist of sectional flights, butt welded together toform a continuous helix. Flights are secured to the pipe by supporting lugs. Both endsof the pipe have permanent internal collars with inside diameters to accept couplings,drive shafts and end shafts.They are used for conveying sticky, gummy or viscous substances, or where thematerial tends to adhere to flighting at the pipe. Stainless steel ribbon flight conveyorscrews can be furnished.

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component selectionType 1 Paddles consist of formed steel blades mounted on bolt or rod shanks which are insertedthrough regular conveyor screw pipe. They are normally mounted at 120 degree intervalsspacing, three paddles per pitch. Paddle at each end of conveyor may be inserted through bolthole in place of regular coupling bolt. Paddle blades may be set at any angle to produce thedesired degree of agitation. Paddle conveyor screws are used for mixing, blending or stirring dryor fluid materials.

Drive shafts deliver the driving power, and are designed to provideadequate torque, bending and shear strength, and correct bearingclearances. For extra heavy loads, high carbon steel or heat-treated alloysteel shafts are used. Jig-drilled coupling bolt holes and accurately cutkeyseats contribute to ease of assembly.

End shafts serve only as support for the last section of conveyor screwand are furnished of cold-finished steel.


component selection

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component selection


component selection

End Lugs are die-formed steel plates welded to both ends of helicoldflighting and to the pipe to strengthen the end of flighting.

Split Flight Couplings permit installing or removing individual conveyorscrews without disturbing adjoining sections. With split flight couplingsinstalled on both sides of each hanger, conveyor screws can be removedwithout disturbing the hangers. The split flight coupling is sturdilyconstructed and jig drilled for coupling bolts.

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component selection

Split Flight Coupling Shafts are used to transmit rotation and to positionaccurately and support the split flight couplings.


component selection

No. 270 Hangers have formed steel frames and self-aligning ball bearingswhich reduce power consumption and noise levels.

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component selection

No. 216 Hangers have formed steel frames of superior strength and rigidtyand are excellent for heavy service. These hangers are normally furnishedwith hard iron, babbitted: bronze, oil impregnated wood or molded fabricbearinqs, but can also be furnished with special bearings.


component selection

No. 226 Hangers have a rigid formed steel frame with clearance for passageof material in large volume. These hangers are normally furnished wit h hardiron, babbitted, bronze, oil impregnated wood or molded fabric bearings, butcan also be furnished with special bearings. Stainless steel frames can befurnished.

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component selection

No. 316 Hangers are similar in construction to No. 216 hangers, except thatthey are self-adjusting. The top bars are arranged to slide on angle guidesfastened to the troughs. These hangers are normally furnished with hard iron,babbitted, bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.


component selection

No. 326 Hangers are similar in construction to No. 226 hangers, except thatthey are self-adjusting. The top bars are arranged to slide on angle guidesfastened to the troughs. These hangers are normally furnished with hard iron,babbitted, bronze, oil impregnated wood or molded fabric bearings, but canalso be furnished with special bearings.

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component selection

No. 216F Hangers are similar in construction to No. 216 hangers, except thatthey are designed for mounting in flared trough. These hangers are normallyfurnished with hard iron, babbitted, bronze, oil impregnated wood or moldedfabric bearings, but can also be furnished with special bearings.

component selection

No. 220 Hangers are similar in construction to No. 226 hangers, except thatthey are mounted on top of the trough angles or flanges. These hangers arenormally furnished with hard iron, babbitted, bronze, oil impregnated woodor molded fabric bearings, but can also be furnished with special bearings.Stainless steel frames can be furnished.


component selection

No. 230 Hangers are similar in construction to No. 216 hangers, except thatthey are mounted on top of the trough angles or flanges. These hangers arenormally furnished with hard iron, babitted, bronze, oil impregnated wood ormolded fabric bearings, but can also be furnished with special bearings.Stainless steel frames can be furnished.

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component selection


component selection

Trough End Plates consist of heavy steel plate, flanged at the top forsupporting the trough cover. They can be furnished with or without feet,formed by a flange at the bottom for supporting the conveyor trough. Theyare drilled and countersunk on the back side, to suit either babbitted, bronze,or ball bearing flanged units, or shaft-mounted screw conveyor drive adapterhousings. Trough end plates with mounting holes located other than shown,can be furnished. Stainless steel trough end plates with or without feet, canbe furnished.

71


component selection

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component selection


component selection

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component selection



Trough Ends

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component selection

Double Ball Bearing Flanged Blocks with drive shafts consist of rigid shaftsoperating in two single row, deep groove ball bearings which are effectivelysealed and mounted in heavy, one-piece gray iron housings. Spring lockingcollars with two set screws hold bearings firmly on shafts. This unit willaccommodate radial and thrust loads. Shafts are available for use with orwithout trough end seals. These flanged blocks can also be furnished withtail shafts.

Trough End Seals provide bearing protection against dust or fumesfrom within the trough and against entrance of dirt, moisture orlubricant along the shaft. The gray iron seal housings are designed forassembly between bearing flanged blocks and the trough end plates.They can be provided with lip-type seals for maximum protection for oragainst the materials being handled, with felt seals when handlingdusty materials, or with waste packing when handling abrasivematerials.

Screw conveyor


component selection

79

Drive Shaft Trough Ends with Double Roller Bearings have large radialcapacity. In addition, the assembly accommodates heavy thrust loads ineither direction, making separate thrust provisions unnecessary.


component selection

Double Roller Bearing Flanged Blocks with drive shafts consist of rigid shaftsoperating in two oversize roller bearings which are effectively sealed andmounted in rugged two-piece gray iron housings. The bearings are held inplace by necked shafts and are suitable for heavy thrust loads in eitherdirection in addition to carrying radial loads for overhung drive applications.These flanged blocks can also be furnished with tail shafts.

81

component selection

Outside Discharge Trough Ends are for bolting to conventional trough flanges,permitting free discharge of material below the trough end. They are made ofheavy steel with a top flange to support the trough cover and are fitted withbabbitted, bronze or ball bearing flanged blocks.

Seal Glands are mounted internally on all trough ends except the outboardbearing type where they are externally mounted. They consist of gray iron splitflanges in which packing materials are compressed against machined steelcollars. These seals provide maximum protection for or against materials beinghandled.


component selection

Outboard Bearing Trough End Brackets permit the use of pillow blockbearings to accommodate greater thrust, radial loads and special sealingarrangements.

83

component selection

Screw Conveyor U-Troughs are made in two basic types: angle flanged andflanged. Angle flanged troughs consist of steel angles welded lengthwise tothe trough plates to form the top flanges. Flanged troughs are made byforming the top flanges integrally with the trough sides from a single steelplate. Steel end flanges are securely welded to each end of the trough plate

in special fixtures to assure square, true connections, They also preserve troughcontour and facilitate assembly, Angle end flanges are used on troughs for 4-through 12-inch diameter screws, and plate end flanges on all other sizes,Troughs made of stainless steel, or other kinds of special metals for specificpurposes, can be furnished.


component selection

85

component selection


component selection

Screw Conveyor Trough Covers are used for the protection ofoperating personnel, dust control or protection for or against thematerial being handled. Covers for U and flared troughs are madein semi-flanged, flanged or hip roof types.

87

component selection


component selection

89

component selection

component selection

Clamps for attaching covers to screw conveyor troughs are available in spring, Quik-Wire and screw types. Quick-acting clamps are primarily used for drop bottom screwconveyor troughs. Spring clamps with brackets are attached to the top side of semi-flanged covers. Plain spring clamps are used for service doors, inspection doors orremovable covers and panels. Quik-Wire clamps and screw clamps are normally usedfor attaching flanged covers to screw conveyor troughs, but can also be used forattaching plain and semi-flanged covers.

Shrouds are used in trough sections of screw feeders to decrease the clearance betweenthe cover and feeder screw to obtain proper feed regulation. Lengths are sufficient toprevent flushing of the majority of materials being handled and gauges are proportioned totrough size and gauge. Stainless steel shrouds can be furnished.


component selection

Trough End Flanges are made of steel angles or plates, formed and punchedto assure accurate, closely-fitted trough connections and completeinterchangeability. Angle end flanges are normally furnished in all listedgauges and on all trough sizes up to and including 12 inches. Plate endflanges are normally furnished on 14-inch and larger troughs, and onheavier than listed gauges for all size troughs.

Supporting Feet are of formed steel for use with end flanges and provide aconvenient means of aligning and supporting conveyors from floors, andsupporting structures. Saddles are used when location of support points does not coincide withthe spacing of joint flanges or when troughs with butt-welded or butt-strapped connections are used.

(1) Bolts are not included. Saddles include angleclip fastened in place for welding to trough.

(2) Angle end flange for sizes 4 " thru 12," othersizes are plate end flanges.

(3) Supporting feet are regularly furnished. Onlyone supporting foot per trough section isnormally required.

(4) Six bolt holes(5) Eight bolt holes(6) Ten bolt holes(7) Twelve bolt holes

91


component selection

Discharge Spouts and Gates provide the meansfor discharging materials from the conveyortrough and for connection to succeedingequipment to which material is delivered. Gatesprovide for selective control of multiple spouts.When ordered separately, spouts or gates will befurnished loose. When ordered as parts ofcomplete conveyors with locations determined,they will be furnished in place. Stainless steeldischarge spouts and flat slide discharge gatescan be furnished.

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component selection

component selection


component selection

Rack and Pinion Discharge Gates have cut-tooth racks welded to the slideplates and are actuated by cut-tooth pinions mounted on pinion shafts

operated by hand wheels or chain wheels. Stainless steel rack andpinions can be furnished.

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component selection


component selection

97

Air Operated Gates for remote operation can be furnished with orwithout air cylinder.


TO AVOID UNSAFE OR HAZARDOUS CONDITIONS, THEFOLLOWING MINI PROVISIONS MUST BE STRICTLYOBSERVED.

1.(A) SCREW CONVEYORS SHALL NEVER BEOPERATED UNLESS THE CONVEYOR HOUSINGCOMPLETELY ENCLOSES THE CONVEYORMOVING ELEMENTS.All necessary housings, covers, safety guards, railings,gratings and power transmission guards must be in place.If the conveyor is to be opened for inspection, cleaning orobservation, the motor driving the conveyor is to belocked out electrically in such a manner that it cannot bestarted by anyone, however remote from the area unlessthe conveyor housing has been closed and all guards arein place. THE HOUSINGS, COVERS, AND GUARDSARE NECESSARY TO PREVENT ANYONE FROMENTERING, REACHING, OR FALLING INTO THEMACHINERY, WHICH MAY RESULT IN SERIOUSPERSONAL INJURY.

(B) If the conveyor must have an open housing as a condition of its use, the entire open conveyor is then to beguarded by a railing, fence or rugged safety grating.

(C) Feed openings for shovel, front end loader or other mechanical equipment shall be constructed in such away that the conveyor is covered by a rugged grating. It the nature of the material is such that a gratingcan’t be used, then the exposed section of the conveyor is to be guarded by a railing and there shall bewarning signs posted.

2. DO NOT PLACE HANDS OR FEET IN ANY CONVEYOR OPENING, TO AVOIDBEING CAUGHT BETWEEN THE ROTATING CONVEYOR SCREW AND THECONVEYOR HOUSING.

3. DO NOT WALK ON CONVEYOR COVERS OR GRATINGS OR POWER TRANSMISSION GUARDS, TO AVOID FALLING INTO OR AGAINST THE ROTATING CONVEYORSCREW.

4. DO NOT poke or prod material in the conveyor with a bar or stick, to avoid being struck by the bar orstick.

5. DO NOT overload conveyor or use it for anything but its intended use.6. DO practice good housekeeping.

Screw ConveyorSafety Practices

Syntron Material Handling SCREW CONVEYERS MUST BE INSTALLED,OPERATED AND MAINTAINED IN ACCORDANCE WITH THE Syntron MaterialHandling OPERATION MAINTENANCE, INSTALLATION INSTRUCTION MANUAL.

Corporate Offi ceP.O. Box 1370Tupelo, Mississippi 38802Phone: 662.869.5711Fax: 662.869.7449

Form No. 1-MHSOL Printed in U.S.A

Saltillo2730 Hwy 145 SouthSaltillo, Mississippi 38866Phone: 662.869.5711Fax: 662.869.7493Toll Free: [email protected]

Changshu#2 Road No. 1Changshu Export Processing ZoneChangshu, Jiangsu, China 215513Phone: +86 0512.52299002Fax: +86 [email protected]

Saltillo2730 Hwy 145 SouthSaltillo, Mississippi 38866Phone: 662.869.5711Fax: 662.869.7493Toll Free: [email protected]

Changshu#2 Road No. 1Changshu Export Processing ZoneChangshu, Jiangsu, China 215513Phone: +86 0512.52299002Fax: +86 [email protected]

Corporate OfficeP.O. Box 1370Tupelo, Mississippi 38802Phone: 662.869.5711Fax: 662.869.7449

Form No. 104-TUP Printed in U.S.A

Proven Engineered Products – Complete Material Handling Solutions

Link-Belt® Screw Conveyors

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