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Thread: Belt Tracking

  1. Belt tracking

    A customer to us has a conveyorbelt with tracking problems,
    It´s a EP400/3 4+2, the belt length is 7490mm and the width 2100mm.
    Beltspeed 2,5m/s, pulley diameters 300mm, pulley lenghts 2200mm.
    There is a mechanical splice, GORO RV6 mounted to the belt.
    The smallest gravel or dirt (10-20mm) tracks the belt sideways.

    We are out of ideas, Yours would be appreciated !

    Thanks

    Hans Sönksen

  2. Dear Mr. Sonksen:

    Without seeing the system, it is extremely difficult to give recommendations. Also, more information is required.

    Is the conveyor a troughed system, or is it a flat belt feeder conveyor? Is the conveyor uni-directional, or does it run in both directions? Is the belt driven at the discharge end, on the return run, or is it tail driven? What are the enevironmental conditions (heat, dirt, wind, etc.)? How is the belt being loaded (in center, in-line, to one side, etc.)? What type of take-up system is used (gravity, pneumatic, screw, etc.)? How much take-up force is used? Is the conveyor aligned? Is the belt bowed?

    Any of these can factors can through the belt tracking off.

    From your description, it appears that the belt runs true when unloaded, but not when a load is applied. From this, the first two items that I would look at are loading geometry and belt tension.

    Good luck in resolving it.

    If you wish to discuss it in greater detail, feel free to contact me.

    Regards,
    Dave Miller
    ADM Consulting
    10668 Newbury Ave., N.W.,
    Uniontown, Ohio 44685 USA
    Tel: 001 330 265 5881
    FAX: 001 330 494 1704
    E-mail: admconsulting@cs.com

  3. #3
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

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    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Tracking of fabric belt

    Adding to the previous posting: Fabric belt may have a weft and warp bias error to the weave. As the belt tension is increased, the bias error alters the tracking trend that the installer used during initial empty belt startup. Further, if the belt does not have crowned pulleys, the errors in mfg. can induce changes in tracking as noted. In lighter belt construction, crowning is specified to aid in tracking.

    Lawrence Nordell
    President
    Conveyor Dynamics, Inc.
    Bellingham, WA, USA 98225
    ph 360/671-2200
    fx 360/671-8450
    email: nordell@conveyor-dynamics.com

  4. Dear Mr. Sonksen,

    Earlier respondents have provided certain information / possibilities. Additionally, you can also check / try the following.
    It is difficult to give specific solution based on the limited information.

    1) Check the pulleys alignment i.e. their axes should be at right angles to the conveyor center line. Pulleys axes should be parallel to conveyor plane.
    2) Idler position adjustment in vertical and horizontal plane, for alignment of belt.
    3) Material loading needs to be at the center of belt.
    4) Belt should be joined in such a manner that the belt is pressing the conveyor pulley uniformly i.e. proper joint.

    Many technical publications of the belt suppliers specifically give few pages for belt misalignment and possible corrective action. You can try such remedies if you have such publications / leaflets from your supplier of the belt.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  5. Additional items to check:

    1. Is belt cupped? (curvature across face of belt) Cupping reduces contact between roller and belt and prevents rolling components from steering belt.
    2. Does belt have camber? (banana like curve to belt) often confused with a crooked splice.
    3. Loading conditions to check for are offcenter, segregated, or surge.
    Larry J. Goldbeck
    Martin Engineering

  6. You state that "the smallest gravel or dirt (10-20mm) tracks the belt sideways". Are you saying that when the belt is loaded it mistracks but when there is no load the belt runs straight?

  7. Re: Belt tracking

    Originally posted by TGT AB
    A customer to us has a conveyorbelt with tracking problems,
    It´s a EP400/3 4+2, the belt length is 7490mm and the width 2100mm.
    Beltspeed 2,5m/s, pulley diameters 300mm, pulley lenghts 2200mm.
    There is a mechanical splice, GORO RV6 mounted to the belt.
    The smallest gravel or dirt (10-20mm) tracks the belt sideways.

    We are out of ideas, Yours would be appreciated !

    Thanks

    Hans Sönksen
    We believe our SG210/50 Sureguide Belt Centralising Return Pulley would solve your problem.
    We can offer this unit at Euro 1560-00 ex factory
    Please visit our websit to view the product.
    www.waloni.com
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  8. Dear Mr. Sonksen:

    Hopefully you have already corrected the mistracking problem.

    If not, I suggest that you have someone conduct a system study on the conveyor to evaluate all parameters. Typically, this can be done by a factory representative of the belt manufacturer or by an independent (consultancy firm or belt service company). Although most of the factors affecting belt tracking have been mentioned by the various posters, there are more. A study should uncover the root cause of the problem and allow your user to take corrective measures.

    If you wish to tackle the problem on your own, there are a number of tracking method publications available from the belt manufacturers and industry trade groups.

    Although I have not seen the conveyor in question, I suspect that the problem lies with one of the following:

    [1] conveyor alignment problem
    [2] loading zone problem
    [3] belt problem [4] splice problem
    [5] tension problem
    [6] environment problem

    If you have specifics on the conveyor, you can contact me directly by e-mail for assistance, or deal with anyone you have confidence in. Your first two steps, however, should be to evaluate the system yourself to look for obvious problems, and to have the belt manufacturer look at the system to get their input.

    Regards,
    Dave Miller
    ADM Consulting
    10668 Newbury Ave., N.W.,
    Uniontown, Ohio 44685 USA
    Tel: 001 330 265 5881
    FAX: 001 330 494 1704
    E-mail: admconsulting@cs.com

  9. #9
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    ALthough others have commented on the loading zone and product placement, I would like to add a bit.

    Look at the product flow stream leaving the discharge system. It may be that the discharge stream that impacts onto the conveyor has a horizontal transverse force vector ( transverse shifting force ).

    If the product stream, viewed in plan within the transfer chute, is turning at an angle to the receiving belt, then the above comment is highly likely.

    View the product stream in elevation, down the axis of the receiving belt, as it falls through the chute. If the stream appears to have a trajectory that does not fall in-line with the receiving belt, then I believe the product's impact is pushing the belt off its center.

    The short nature of the conveyor will increase sensitivity the mal-tracking from many sources.

    There are still many other conditions which many produce the mal tracking behavior. The afore-mentioned may be easily verified and reported back to stop further hunting expeditions.

    LOL,
    LKN

  10. #10
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Sorry for this added point of clarification:

    The product stream impacting onto the conveyor is the only point of interest. Product may take a varied path like a careening billard ball within the chute. Its only the thrust, at the point of impact, that counts.

    LKN

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