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Thread: Air Knife Technology

  1. #1
    jmorrish Guest

    Air Knife Technology

    HI All,

    I am looking for recc. for a good air knife system.

    Belt conveyor is 1600mm, 45o trough, heat resisting (hence, gets cracks), cargo is cement clinker - 140oC maximum. It also carries, gypsum and crushed limestone.

    The primary scraper is ESS and no secondary scraper..this issue is the carry back in the cracks of the belt.

    Belt speed is 1.6m/sec. Pulley dia is 700mm.

    I am concerned with dust buildup on the gap and also the effect of moisture if broken down etc...clinker dust tends to harden very well. Hence, need an air knife with ease of cleaning/clearing.


    James Morrish


  2. Hi James,

    You can get good quality air knife systems from a number of sources (web search will get you the major suppliers). If that is not possible, start with Martin Engineering at

    Be warned, however, that there are two potential problems with that approach. The first is cost -- keeping an effective airflow can be expensive. The second is dust control -- the force of the air can cause the overcarry material to be blown to areas that are sensitive to dust (i.e. a containment structure will also be required).

    An alternate method of freeing trapped material from belt cracks is to use a "belt-thumper", similar to that used with corrugated sidewall belts. These products beat the bottom cover of the belt just after the discharge and loosened material falls into the chute (a chute extension may be required). You can get information on these from the larger sidewall belt manufacturers, such as Beltwall ( or Metso (

    Good luck on your project.
    Dave Miller
    ADM Consulting
    10668 Newbury Ave., N.W.,
    Uniontown, Ohio 44685 USA
    Tel: 001 330 265 5881
    FAX: 001 330 494 1704

  3. #3
    vortron Guest


    You may wish to visit web site

  4. #4

    Air knife

    Have seen air knives using compressed (plant) air. This is wasteful of energy. They seem to work if the air stream is directed into the head chute for instance where dust collection air is being extracted.
    Try talking to Spraying Systems Co. or 1800 622 508 about their Windjet system which uses a side channel blower. Never used it but it looks worth a try.

    Michael Reid.

  5. Hello again James,

    I had another thought on the matter. If the heat cracks are not too deep, you may consider sanding the belt (assuming that it is not too long) to the point were the cracks disappear.

    Note that I am also assuming that you have the right cover rubber for the application. If not, you are better off replacing the belt with one rated for the duty (consult with your belt manufacturer) then spending money on a constant stream of air.

    Also, you may want to talk with Eli-flex to see if they have a product that can take the heat your process requires. Their regular product is very effective in handling damaged cover rubber.

    Again, good luck in finding a cost effective answer.
    Dave Miller
    ADM Consulting
    10668 Newbury Ave., N.W.,
    Uniontown, Ohio 44685 USA
    Tel: 001 330 265 5881
    FAX: 001 330 494 1704

  6. #6
    vortron Guest

    Cleaning of conveyor belts

    Air blow-off using high efficiency centrifugal blowers will handle dust, wet dirt,, and water.

    You may wish to visit

    Homer Fager

  7. #7 Guest

    cracks in belt

    Hi James,

    Eli-Flex is a two-pack belt repair and filling resin.

    The product will fill the cracks in your belts and will withstand up to 150 Deg.C

    If you require any more info, please contact me on :


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