Screens & Feeders Maintenace

7/28/2019 Screens & Feeders Maintenace

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Sandvik Mining and Construction

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Terms

1. Screen body2. Screen cloths / screening

media

3. Drive motor / unit

4. Mechanism

5. Spring support

6. Dust encapsulation (option,not shown in photo)

1

2

43

5


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Material flow directionMaterial flow directionMaterial flow directionMaterial flow direction

Drive unitDrive unitDrive unitDrive unit

Discharge endDischarge endDischarge endDischarge endFeed endFeed endFeed endFeed end

Vibrating unitVibrating unitVibrating unitVibrating unit

Right SideRight SideRight SideRight Side

Left SideLeft SideLeft SideLeft Side


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1 2

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Maximum allowed height differencebetween spring supports (same end) is 3 mm!


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Spring supportpedestals

Water hose


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Widht of the screen in metres 1,0 1,2 1,5 1,8 2,1 2,4 2,7 3,0

Center distance of spring supportpedestals in mm

1400 1600 1900 2200 2500 2800 3100 3400

1height difference in mm 24 28 33 38 44 49 54 59



Table below shows what 1, 2 and 3 degrees inaccuracy inspring pedestal on one side of the screen means in mm toscreens level.

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Torsional displacement

7 degrees nominal load

Radial displacement

1-2 mm

Axial displacement

2-5 mm

Conical displacement

2-5 degrees constant 8-12 degrees temporary

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Cardan AdapterPre-compression band

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Stroke Stroke length

frequency Linear stroke screens (like LF) Circular stroke screens (like SC, CS,)(stroke in centre of the screen)

920 rpm 9.5 mm 8 mm

820 rpm 12.0 mm 10 mm

730 rpm 15.0 mm 13 mm

Remember that increased stroke length shortens the bearing lifetime!

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2

3

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6

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500 600 700 800 900 1000 1100 1200 1300

3

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9111315171921

G

-force

rotation speed (rpm)

Stroke length (mm)


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Shape of SC / CS / XS screens stroke(screens, where the mechanism is closeto gravity point of the unit)

Stroke is circular

Shape of MSO-screens stroke

Stroke is elliptical in end of the screen, circularin the middle

Stroke angle is hard to determinate.

In G-force calculations the stroke in the middle

should be used


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Shape of LF-screens and feeders stroke

two shafts

Stroke is mainly linear (just a bit elliptic)

Stroke angle is about 60 degrees.


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Example:

Linear stroke screens Circular stroke screens

Stroke length Stroke angle Stroke length

12 mm 55 degrees 12 mm

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Click the screen above to see whathappens to screen body whenrunning in resonance

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Notice that any kind of welding or excessive heating of screen body is not allowed withoutconsulting manufacturer first!

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picture 2 fastening bolts

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Bigger (steeper) Smaller (lower)

stroke angle stroke angle

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Mech.size

Gear wheel part numberNumber of teeth in gearwheel

one tooths effection tostroke angle

B13 713.0676-001 60 3,0

B16 MGF-B16-OP5 80 2,25

B20 MSS-B201-OP3 90 2,0

B24 MGF-B24-OP11 60 3,0

B30 ST5194-B30-OP4 70 2,57

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1. Bearing house

2. Space tube 3. Shaft

4. Counterweight

5. Bearing

7. Cover

8. Counterweight

guard

4. Extra counterweights

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Bearing size

Bearing house Shaft

Diameter Tolerance Diameter Tolerance

B16 170P6-0,036

-0,06180g6

-0,010

-0,029

B20 215P6-0,041

-0,070100g6

-0,012

-0,034

B24 260P6-0,047

-0,079120g6

-0,012

-0,034

B30 320P6-0,051

-0,087150g6

-0,014

-0,039

B34 360P6-0,051

-0,087170f6

-0,043

-0,068

B38

with

bushing

460H7

Bearinghouse

+0,063

+0,000

190f6

-0,050

-0,079

460k7

(Bushingoutside )

+0,068

+0,005

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(Bushinginside )

-0,051

-0,087

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figure 3

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figure 7

Filled with grease in connection with assembly

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70/105


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71/105


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picture 1

picture 2

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72/105


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picture 1

picture 2

in picture 2 cardan shafts not shown

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73/105


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74/105


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75/105


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76/105


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77/105


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measured from center of

the tube

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78/105


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Antifretgreasebetweenbearing andshaft

Grease nipples for cardanshaft

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79/105


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B. Mineral oils

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80/105


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81/105


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82/105


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83/105


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84/105


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Centre Distance Allowance For Installation(Flanged Pulleys Removed)

and Tensioning (mm)

Additional Centre Distance Allowance ForInstallation Over Flanged Pulleys

Belt Installation

Allowance

Tensioning

Allowance(Any Drive)

Belt Pitch One Pulley

Flanged(mm)

Both Pulleys

Flanged(mm)

1000mm and under 1,8 0,8 5mm

8mm14mm

12

2236

19

3358

Over 1000mm to 1780mm 2,8 0,8 LH

2532

3548

Over 1780mm to 2540mm 3,3 1,0

Over 2540mm to 3300mm 4,1 1,0

Over 3300mm 5,3 1,3

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85/105


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Insert push into pulley

Insert screws and locate onshaft

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86/105


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Tighten screws alternately

Tighten screws finger tight

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87/105


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88/105


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89/105


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90/105


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91/105


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92/105


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Formula 16

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93/105


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94/105


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95/105


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96/105


Trouble Possible cause Correction

Screen does not start or itstops during operation.

1. Electrical fault.Check wiring and components andcorrect.

2. Too high oil viscocityChnage oil to correspond ambienttemperature.

3. V-belts slipping or broken.Check condition and tension ofbelts.

4. Timing belt broken.Check condition and tension ofbelts.

Screen running incorrectly (inmotion).

1. Screen contacts something duringoperation (base,m chute, material,ice etc.)

Arrange space for screen to runcorrectly.

2.V-belt/timing belt pulleys and/or V-belts/timing belts are worn.

Change new ones.

3.Drive equipment is wronglypositioned in relation to vibrating

shaft.

Move and adjust according to

instructions.

4. Screen base not solid enough. Support.

5. Springs broken or tiredChange springs. Screen is galloping

overloaded add springs.

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97/105



Drive equipment deflects andvibrates too much.

1. Fastenings has loosed. Tighten the fastening bolts.

Screen supporting framedeflects and vibrates toomuch.

1.Construction is too light orinsufficient bracing. Add support and brace.

2.Foundations of screen frame are notstrong enough.

Build up foundations.

3.Support structure critical frequencytoo close to to operating speed.

Build up foundations.

Unusual noise duringoperation.

1.There are loose or damaged parts inthe screen.

Tighten, repair or change the part.At the same time check all screwsfor tightness. Check the reason fordamage.

2.Screen contacts something duringoperation.

Arrange space for screen to run.

3. Screen meshes are loose. Tighten according to instructions

4. Bearing damage. See bearing damage.

5. Broken spring.Change spring after checking thecause.

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98/105



Unusual noise duringoperation (continued).

6.There are stones, dust, tools etcinside the counterweight guards.

Clean regularly.

7. There are stones between springs.Clean the spring systems regularlyand prevent material from buildingup between the springs.

Screen bearings overheat.

1.Incorrect amount of oil in vibratingshaft.

Check oil level.

2. Wrong type or old oil in shaft. Change oil.

3. Bearing damage. See bearing damage.

4.High temperatures in theenvironment or material.

Arrange ventilation and change theoil suitable for high temperatures.

5. Too high speed. Lower speed.

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Bearing damage.

1 Normal life of bearing exceeded.

Check amount of operating hoursand always replace damagedbearing with a new one. Check also

possible reasons for the damage.

2. Insufficient lubrication.Check lubrication maintenance andpossible oil leakages.

3. Unsuitable oil. Change oil type.

4.Foreign material (steel, sand etc.) in

oil.

Check the cause (some damagedpart, dirty conditions during oil

change, dirty cans in handling of oiletc.)

5.Shaft is not in level position, whenthe other bearing is overfilled andthe other underfilled with oil.

Adjust the screen to the rightposition according to instructions.

6. Axial loads bearing stuck on shaft.

Use corrosion protection lubricant

between shaft and bearing. See item6.8

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100/105



Bearing damage (continued).

7. Too high speed. Lower speed.

8. Too high G-force. Reduce stroke length/speed.

Oil leakage.

1. Breather is clogged. Clean or change breather regularly.

2.Seals are worn out or damaged (forinstance during assembly). Do notreuse old seals

Change the seals being careful thatthe new ones are not damagedduring installation.

3. Wear ring is worn out.Change wear ring to a new one. It isadvisable to change a new ring atthe same time with shaft sealing.

4. Oil level assembly loose or leakage. Tighten it.

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101/105



Aperture in screen meshes is

clogging or screen capacity isinsufficient.

1. Stroke angle or form incorrect. Adjust according to instructions.

2. Stroke lenght is too short.Adjust counterweights according toinstructions.

3. Too low frequency.Alter V-belt ratio by changingsheave.

4.

Unsuitable meshes (for instance toothick meshes in relation to aperture,shape of opening unsuitable, toosmall net opening percent etc).

Install suitable mesh.

5.Material includes plenty of clay,mud or other impurities.

Wash material before screening.

6. Too high feed rate to the screen. Reduce the feed rate.

7.Incorrect rotation direction of thestroke.

Change the rotation direction.

s~=p=C=c=q=


102/105



Material flows mostly on oneside of the screen.

1. Incorrect feed to the screen.Re-position the feed so that it isevenly spread across the whole

width of the screen.

2.Screen is not running in the rightposition.

Check the horizontal position of thespring pedestals.

Too much material collectingat feed end of the screen.

1. Conveying rate of screen too low. See corrections above.

2. Too high feed rate or uneven feed. Adjust feed rate.

3.Material fed against the conveyingdirection of the screen

Arrange feed as per manual chapter3.2.

4.Direction of the screen rotationincorrect.

Check direction of rotation andchange if necessary.

5.Too heavy material load from the

chute above.

Adjust feed chute to remove head

load.

s~=p=C=c=q=


103/105



Screen meshes wear or breakin some places rapidly;unusual high wear of meshes.

1.Wrong tensioning of meshes insome places, or generally in thewhole screen.

Check and retighten screen meshesaccording to instructions regularly.

2.Fed material falls onto the screenmesh instead of the receiving area.

Re-position feed arrangement.

3.Screen mesh unsuitable forscreened material.

Change the mesh. (for instancesteel wire mesh to rubber mesh).

4.High capacity of screen and highlyabrasive material.

Change the mesh. (for instancesteel wire mesh to rubber mesh).

Material spills from chutesonto maintenance platformsetc.

1.Feed or discharge chutesunsuitable or incorrectly installed.

Re-install and seal. It is notpermitted to connect extra parts tothe screen body as this can impairthe operation or damage the screen.

2.

Screen worn so badly that materialis leaking from feed or dischargeareas or side plates. This canhappen if wear plates are notchanged in good time or if they areloose.

Check the condition and fixing ofwear plates and change in good

time according to instructions.Check also tightening of the boltsregularly.

s~=p=C=c=q=


104/105



In dust sealed screens, dustescapes.

1. Leak in the dust enclosure. Seal.

2.

Insufficient suction in the dust

enclosure.

Increase suction of vacuum inside

the enclosure.

Supporting springs of thescreen tilt too much.

1.Fastening screws in the springingsystem loose.

Tighten and change ifnecessary.

s~=p=C=ct~


105/105


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Screens & Feeders Maintenace

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Transcript of Screens & Feeders Maintenace