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Thread: Conveyor Belt Plows

  1. #1

    Conveyor belt plows

    I have designed a return plough that does not actually rub on the belt surface.
    The sole job of a return plough is to stop large material that has dropped onto the belt from above from entering a take-up station or the tail pulley.
    We have found that over a period of time, the bottom belt cover was being damaged by the existing plows that sat on the belt and were tensioned by the actual plow weight. These plows had urethane blades which quite often dug in and vibrated.
    The new ploughs are in operation at a diamond mine with belt speeds of 4.9m/sec. Please contact me for further info

  2. Return belt cleaner / scraper

    Congratulations for your new developed return belt cleaner (V Scraper). Word plough is frequently used for V-Scraper / straight-scraper for discharge of material from carrying run, and hence I understand it is return belt cleaner.
    May I know how much gap is kept between blade edge and belt surface. This may be somewhere like 0.75 mm or so. This clearance will have relation to tolerance in belt thickness for its unevenness in surface.
    Is your development specifically in response to extreme abrasive nature of material?
    You may clean escape of fine dust by blowing air. I hope this suggestion may be of use to you.

    Regards,
    Ishwar G Mulani
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Emaiil : parimul@pn2.vsnl.net.in

  3. #3
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

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    Oakpoint

    How do you keep rocks larger, but close to the gap size, from becomming trapped between blade and belt; thereby damaging the belt?

    We recommend using a scraper in conjunction with a downward semi twist of the belt edges using reverse V-return rolls. Gravity assists the scraper/plough in deflecting rocks. The angled rake of the scraper blade minimizes the potential for rock entrapment. The scrapers are located before the inverted V-return rolls.

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    website: www.conveyor-dynamics.com
    email: nordell@conveyor-dynamics.com

  4. Oakpoint:

    You mentioned that the sole job of a plow is to prevent large debris from entering between the belt and pulley. I agree that this is an important duty of the plow, but I also suggest that the plow should be used to prevent fines (wet or dry) from entering between the pulley and belt. Fines can create two problems -- that of uneven build-up on the pulley, which creates a belt training problem; and that of gradual build-up and hardening which acts the same as a large stone between the pulley and belt, which can do damage to the belt carcass.

    This problem exists with materials such as gypsum, cement, salt, fertilizer, and others. I've also seen problems of this nature with belts carrying limestone.
    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

  5. #5
    On the Zambian Copperbelt there is/was an inclined conveyor feeding ore into the Converter Hall. Spillage at the feed point was severe enough to develop piles against the gantry sidewalls. These piles were up to the handrail height. Fresh spillage would cataract down these piles at a fair speed and bounce over the plough into the tail pulley nip. Lump size was about 250mm.
    Regardless of what material is selected for the plough blades; what clearance is maintained or what other criterion is considered there is no point in operational staff blaming the conventional equipment if it is correctly specified and maintained.
    Ploughs can work at least as well as head end cleaners if they are correctly installed and adjusted along with the rest of the gear.
    I could not take any photographs of the situation because it was illegal to do so in Zambia in 1988. But they would have been worth a second glance!

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