Belt Conveyors - RBL

7/23/2019 Belt Conveyors - RBL

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February 1st, 2012

BELT CONVEYORS

Vincent GUILLEMOT


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RBL-REI is active in the field of

RBL-REI

more than a century through its branch LaStphanoise.

more than 50 years through REI.

more than 30 years through RBL.


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The main activities of our company are:

Handling by belt conveyor

Storage and extraction of materials

Loading and unloading of trucks and wagons

Preparation of materials

Conditioning


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RBL-REI activities are made in the followingindustries:

Mines Quarries

Port infrastructures

Processing industries (cement factories,

fertilizers, mineralurgy, etc)

Food industry

Environment (biomass )


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CESECO Presentation

1) Belt conveyors / principle

2) Belt Conveyors applications

3) Why choosing a belt conveyor transportation instead of road or railmode ?

4) Types of belt conveyors

5) Equipments

6) Calculation and design of a belt conveyor

7) Global procedure for a project


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Subject :Handling of bulk or conditioned materials from A to B.

Belt conveyors / principle

Belt conveyors technology has been existing since1870s. At this time, the first tests had been made with

coton belts without coating and wooden idlers.


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PRINCIPLE

Feeding

Driving unit

Tail

Head

Tensioning system


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Composants :Belt

Feeding skirts

Driving unit

PulleysScraper

Idlers support /

idlers

COMPONENTS


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Mines and quarriesBelt Conveyors Applications

unne s

Ports

Food/fertilizers

Mobile equipments

Airports, automatism

Industries


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Quarries


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VICAT ENIEU


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VICAT ENIEU


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Mines


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Tunnels


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Tunnels


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Tunnels


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TUNNEL


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TUNNEL


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Tunnels


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TUNNEL


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PORTS


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Ports


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Portuaire

Ports


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Portuaire

Ports


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Ports


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FOOD / FERTILIZERS

Fertilizers


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Portuaire


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Portuaire


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3. WHY CHOOSING A BELT CONVEYORTRANSPORTATION INSTEAD OF A ROAD OR

RAIL MODE ?


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Compared to the road transportation

Limitation of pollution

Cost price by transported ton very low

Very low power consumption

Limitation of transshipments (setting/taking back )

Very high reliability of the process

Infrastructure in design and maintenance less expensive

Reduced staff


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Compared to the rail transportion

Limitation of transshipments (setting/taking back)

Infrastructure in design and maintenance less expensive

Installation adapted to short and average distances


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SOME FIGURES

More than 1000 conveyors of which 35 of more than 5000 m et 50integrating vertical curves and especial range of horizontal curves

Range of capacities: from a few tph to 20 000 tph Speed of the belts: between 0.5 m/s to 8 m/s for the fastest.

Power: from a few hundred watts to 10 500 kW.

Length: from a few meters to more than 16 kms.

Rays of horizontal curves : from 150 m to several kms.


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Case studyCase study


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Rights, concave or convex conveyors

Curves conveyors Raising conveyors

Descending conveyors

Belt conveyor with two loading strands Conveyors going through natural obstacles

Extensible conveyors

Change of angle

Stackers

Tripper

Reserve of belt

Belt extractors

Belt with side


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On the ground


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P.R.S (Reconstitued welded beams)


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Gallery


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Ground / P.R.S/ Gallery

T b


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Tube

C b lt


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Concave belt conveyors

C b lt


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Concave belt conveyors


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Convex belt conveyors


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Curved belt conveyors


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TURNING RADIUS

Conveyors with horizontal curves are called : CURVODUC


(mark deposited ).

The first we achieved was commissioned in 1963.

95 % of very long conveyors are conveyors which havehorizontal curves due to the facts of natural obstacles or

agrarian constraints.


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CurvoducTM


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Raising conveyor


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Descending conveyor

Generator conveyor


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Generator conveyor

Supply of power to the network

Belt conveyor with two loaded strands


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Conveyor going through natural


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obstacles

GOING THROUGH NATURAL OBSTACLES

eren so u ons:

PRS structure or gallery for a crossing span up to 80 m

Between 80 and 200 m, suspended bridge

Beyond, we start a particular study



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y g g g

obstacles

Transporteurs passant des obstaclesnaturels


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obstacles

Conveyor going through naturalobstacles


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obstacles

Change of angle


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g g

Change of angle


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g g

Stacker


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Extensible conveyor


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Diaporama 1

Belt Storage


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g

Belt extractor


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Edges Belt


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Equipments


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Belt Feeding Skirts

Driving unit

PulleysScraper

Idlers support /

idlers

COMPONENTS


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B l


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BeltsBelts are characterizes by :-The type of carcass.

-The type of coating-The elements of the structure

The type of carcass:

Three types of carcass exist:

- The SteelCord belt.Made of steel cables.

-The textile belt multipliEquipped with several fabric folds (coton,polyester, polyamide, aramide)

-The belt textile monopliA monopli carcass made of polyester

Polyamide.


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- Type of coatings :

The coating is the part of the belt in contact with the product, it can be:

- Abrasive Resistant- Heat Resistant- Cold Resistant

- rease es s an

- Anti-static- Flame Resistant- Impact Resistant- Anti-clogging- Food products dedicated

- The elements of the structure :

The belt can also be equipped with elements of the structure such as:- Plate- Chevrons,

- Side-..

Belt Conveyor Driving


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It exists many ways to drive a conveyor:

Thanks to one driving unit or several, connected to one or several pulleys

1 single driving unit connected to a single driving pulley

5 driving unit shared on 4 driving pulleys

Belt Conveyor Driving


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Generally, a driving unit is composed of :

-Motor 4 poles 1500 tr/mn with legs.

- -

-Parallel or perpendicular reducer

- Low Speed coupling (semi-rigid) orReducer with hollow shaft

Note : For inclined conveyors, a back stop system is recommanded

2 Driving Units with Hollow Shafts

Booster


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Booster function is to reduce the belt tension

Booster


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Cleaning


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scraper

The cleaning of the belts is an important

element in designing conveyors. Il isgenerally done by Scapers with blade

type underlying or tangential.

Cleaning :

Underlying scraper

On long conveyors, systems of belt returnsare generally employed.

Tensioning system


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Tensioning systems:

Every conveyor is equipped with a tension system to:

- Permit the power transmission by friction between the driving .

- Absorb the differences of belt length due to belt extension.

Three main systems of belt tension exist:

1/ Screw tension for conveyors with low Axis Distance Center

2/ Gravity counterweight

3/ Tension with electric winch.

Tensioning system

Gravity Counterweight through take-up pulley


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Gravity Counterweight through take-up pulley

Tensioning system

Gravity Counterweight through horizontal trolley


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Gravity Counterweight through horizontal trolley

Tensioning system

Electric Winch


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Electric Winch

Covers

Hooding

Complete hooding


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Complete hooding

Covers

Hooding

Protection of upper strand only


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Protection of upper strand only

Safety


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Safety


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Emergency wires along the belt conveyor

Clogging detector

Speed switch

Belt Deviation switch

Control Box


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Supervision screens


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Calculation and desi n of a belt

conveyor

Product :

Parameters to calculate and design

a belt conveyor


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Chimical charcterisrics :

Corrosive

Explosive

Dangerous

..

Product :

Physical characteristics :

Density

Pulverulent (cement)

Round (fertilizer)

a be t co eyo

Abrasive (clinker, granite )

Liquid (muds) Granulometry ( 0-1000 mm)

Sticking (clay)

Cutting (glass, slate) ..

The type of the product will determine the length, the speed and

the belt coating.


a belt conveyor


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Implantation:y

The implantation of a conveyor is necessary for:- The power calculation- The implantation of the elements of the conveyor and in particular, the tensioningsystem.

The environnement of the conveyor is also important (interior, exterior, wet, dusty,

wind, seism, snow, etc. ..)


a belt conveyor


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Capacity : The capacity of a belt conveyor is reached thanks to the trough capacityFormed by the belt on the idler supports.

y

For example, the sectional capacity of this type of through is 0, 39 m.With a belt speed of 1 m/s, the flow is: 0,39 m3 x 3600 s = 1404 m3/h.For a product with a density of 2 at a speed of 2,5 m/s and an angle of dynamic slope angle of 10

The calculated flow of the conveyor will be of: 1404 x 2 x 2,5 = 7020 tph

Capacity (usual table) :


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Idlers/Idler supports:


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Idlers are the rolling metal supportA Idler support can be equipped with 2,3 or 5 idlers according to

conveying needs.Generally, they are with 3 idlers for the superior parts. For inferiorparts, conveyors can be equipped with plate or V idlers at 10.

The transition of the trough is the necessary length to put the belt on trough, itis determined in function of the type of the belt and the angle of the trough.In a usual way, we consider that the transition must not be inferior to 8 timesthe depth of the trough.

Transitions :

Pinching


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The idlers pinching is important for the belt tobe well-held on the track. The upholding of the

belt is done by the friction belt / idlers.

Idlers are greased for life and generallyhave standard diameters (89, 133, 159 mmor more).The idlers are determined in function of theproduct load, the idlers supports span, and

the belt speed.

Idlers:

Functioning timetable:


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The idlers can be equipped with special coatings:

- Rubber for shock absorber idlers.

- Rubber rings for the anti-plug

Special idlers :

Calculation and design of a belt conveyor


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A conveyor is determined by 2 phases:

- The choice of the belt and the trough angle of the conveyor.

- The calculation of the power of the conveyor.

Example of calculation :


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Example for a conveyor having the hereafter characteristics:

Axis distance center: 100 m, rectilinear.Slope: 5,7 Product: scories (scoria)

ow requ re : pDensity of the product: 1,3 t/m3

Dynamic slope angle: 10Maxi speed of the belt: 2 m/sMaxi loading rate: 70%

Determination of the belt width:

The researched flow in m3/H is of 615 m3/h

The maxi speed being of 2 m/s, the flow at 1 m/s will so be of 308

m3/h.

With a maxi filling rate of 70 %, the belt flow has to be of 440 m3/h

Selection


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Filling rate with a belt of 1200 mm , trough 30 : 61%

Calculation of the conveyor :


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In our case :


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P3 = 1,5 * 1,2 * 2 = 3,6 KW

PT = 13,14 + 21 + 3,6 = 37,7 KW

PM = 37,7 /0,9 = 42 KW soit : 45KW


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Choice of the belt:

s erea er ca cu a on a ow o

make a approach of the type of the

belt for a conveyor with simplegeometry and one motorization.

- Angle denroulement :

200,

- FS between 8 and 10.(security factor)


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K = CR * PT K = 17 * 37,7 K = 320 N/mm

In our case, with the use of a belt with a security coefficient to junction 1:

CV V 1 2

The belt will be of Trioflex 400 type or more

CHARACTERISTICS OF PRODUCTS -1-


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Global procedure of a project

GLOBAL PROCEDURE OF A PROJECT


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Analysis of the customers needs

Seeking solutions

Calculation

Phase of achievement


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CUSTOMERS NEED

Lifespan of the equipment


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Lifespan of the equipment

Annual flow and time to reach Daily, monthly and annual mode of use

Characteristics of the product (density, granulometry,

moisture, abrasion etc.) Geographical considerations between the feeding point and

the discharging point

Obstacles to be taken into account

Constraints of environment (pollution, dust and noise)

Safety constraints


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Elements to be taken into

account


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Altimetry of the ground

, , .

Obstacles of infrastructures such as roads, railways,powerlines, etc .

Predimensioning of the conveyor with an approach of the

possible horizontal radii by sections according to the

various efforts in the belt


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FIGURING


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In tartin

In steady state operation

In normal deceleration, emergency stop

In the event of electrical supply network shutdown

CALCULATION OF BELT STABILITY

IN HORIZONTAL CURVE


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DYNAMIC CALCULATION


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PHASE OF ACHIEVEMENT

V lid ti f th li t d f i


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Validation of the alignment and of rise

Validation of the means of self-supporting quality

on the ground and dimensioning of the bridges

or tunnels

Phase of construction

Phase of assembly

Phase of tests


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Validation of belt conveyor route and profile

ground and in elevation)Fabrication and procurement

Erection and commissioning phase

Tests phase


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THANK YOU FOR YOUR

Belt Conveyors - RBL

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