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Thread: Carry Back Due to Static

  1. #1
    Andre Bresler - RSA Guest
    I am looking for a solution to carry back of static material on a conveyor that is causing spillage and dust. Belt scrapers are not effective in combatting the problem and I am eager to find a solution to removing static from the belt / material


  2. Andre,

    You can try a combination of a good belt cleaner at the discharge pulley with a wash box (spray and scraper combination) after the pulley.

    I would need more information to make recommendations on cleaner type and configuration.

    Regards,
    Dave Mille
    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
    jmorrish Guest

    static

    We ship fly ash which is hard to remove the belt esp. worn belts with cracks in it.

    The best we have done so far is a ESS primary scraper - Durt Hawg with a REMA rotary rubber brush at 1400rpm.

    It works well.

    With conventional scrapers - we had to put a lot of pressure on the belt to get then clean leading to belt splice problems.

    I hope this helps U.

    James Morrish

    Engineer
    Queensland Cement

  4. Hello Andre Bresler,

    As suggested by Mr. Dave Miller and James Morrish, the solution is to have scraper of proper design, then wash box or rotary nylon brush, as a routine solution.

    The novel suggestion is as below :
    Let the return belt pass through an enclosure (sheet fabricated) and direct a cleaning air jet on bottom face of return belt, in this enclosure. The gap between moving belt and the enclosure to be reasonably sealed by soft rubber or suitable material. The air jet will remove the dust. The dust-laden air is to be extracted at other end of enclosure (box) and passed through dust collection system.

    I think this will mostly remove the dust, however, its price, space for installation, etc. to be analysed. As a trial, you can just use compressed air to create a blow as above and see whether it removes the dust. The trial is without specific enclosure etc.

    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. I don't know the width of the belt and the type of belt in your application.
    If the residue on the belt is just dust and the said dust is dry and it stays on the belt due to the static electricity than you can use an air knife with an air ionizer to deal with the static and dislog the dust particles.
    To control the dust you need to create some type of hood as stated by Dave Miller.
    If the belt is relatively narrow, simple ionizer bars are available and inexpensive. These gadgets operate on compressed air and the operating costs need to be calculated.
    Comparing the cost of operating a pnuematic air knife or a blower system with static eliminating capabilities in my opinion will decide which system to install.

    Just my two cents!

    Antonio Reis
    Vitrom Mfg Consultants
    www.vitrom.com

  6. #6
    Join Date
    May 02
    Posts
    23

    Gulf G- AKV

    Gulf conveyors have a product they call G AKV. It works with an air knife and vacuum, needs compressed air and suction. It works well with alumina on a cracked belt. Contact Denis on dennisp@gulfch.com.au

  7. The condition of the belt is essential to acheive good belt cleanin g. Top cover damage will reduce belt cleaning as much as 50 per cent. I would recommend determining why the belt top cover is being damaged, correct the situation, then the belt can be cleaned efficiently. Foundations III has good in formation about belt cleaning and belt damage. Contact Martin Engineering for a copy.
    Larry J. Goldbeck
    Martin Engineering

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