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Thread: Cleaning of Conveyor Belt

  1. #1
    HASAN KAZMI Guest

    Cleaning Of Conveyor Belt

    A CONVEYOR BELT WHEN USED IN TRANSPORITNG STICKY WET POWDER QUICKLY GET MISALLIGNED AND TENDS TO CROSS OVER THE ROLLERS.

    TRIED SCRAPPER AT SEVERAL POSITIONS BUT NOT SUCCEDED IN OVERCOMING THIS PROBLEM.

    ANY HELPING HAND?


    THANKS

    HASAN

  2. #2
    Join Date
    Jan 01
    Posts
    20

    DIRT WHACKER Solution

    Sirs,

    I have seen your post saying that no scraper gave solution to your problem. Can I ask you to have a look to our solution hereunder ? We have won the Silver Jubilee of the best mining invention (the gold was not for a scraper) and are 100% sure to solve a problem on quick belt evenmore if there are a lot of sticky stuffs ! We guarantee 100% efficiency on quick belts (up to 8 meters/second), reversible belts clipped belts.
    *******
    We are manufacturer of a wonderful belt scraper called "Dirt Whacker". Our extension in ALL companies in Europe but as well as Africa makes our scraper n1.

    The "Dirt Whacker" is the only one giving 100% efficiency on CLIP belt and REVERSIBLE belts, that is why we won the silver jubilee of the best mining invention.

    REVERSIBLES BELTS : thanks to the parallelograms, the scraper can reverse himself at the same time than the belt is reversing !! You do not have to stop the belt anymore nor make some scrapers modifications. Everything will be made instantly !!

    CLIP BELTS : our blades are very special. Indeed, our tungsten carbide blades are brazed between 2 mild steel. When the clip hit the scraper blades, this clip will first hit the mild steel and the rubber pipe of the scraper will amortize/compensate the chock. We guarantee the efficiency of that worldwide patented system.

    FOOT PUMP : the installation is so easy that you just need a foot pump to inflate the scraper ! We give you this foot pump for free. Just inflate the scraper between 400 600 grams. That is all you have to do. The blades will scrap the belt wonderfully !

    QUICK BELTS : we guarantee our scrapers for belts whose speed reach 8 meters/second without any problems !

    Our reference in chemica/mining/siderurgies and Power stations companies are various and the countries where we are homologated and fully standardized are for example : Tunisia (all chemical groups
    and phosphates extractions + cement plants), Morocco (all chemical groups and phosphates extractions + power stations and cement plants), Algeria (siderurgy + phosphate extractions) + Senegal (chemical industries + extractions), Mauritania (iron), Gabon (manganese), Congo (diamonds + copper/cobalt), South-Africa (diamonds, platinum, coal,) but as well as in all Europe with applications such as in Belgium where we were the only 1 to be able to supply for a size of belt 4000 mm.

    Size of the scraper 4000 mm in 100% stainless steel. (Pictures on demand by email). France, Benelux, UK, Germany, even Hong-Kong and Thailand recently ,

    No maintenance anymore.

    We hope to have positive news from you.

    WE HAVE NO EXCLUSIVE AGENT/DISTRIBUTOR FOR PAKISTAN. ARE YOU INTERESTED ?

    PLEASE VISIT OUR WEB SITE : www.matam.be


    In the meantime, receive, our very best Regards.

    GERALD COENEN
    General Manager
    Email : info@matam.be
    Fax : 003223530021
    Tel.: 003223546734
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    GERALD COENEN
    Sales Department
    Address
    32, Dreve des Pins
    B-1420 Braine l'Alleud
    Belgium
    Tl.: 00-32-2-354-67-34
    Fax : 00-32-2-353-00-21
    Email : info@matam.be
    Web site : www.matam.be

  3. Dear Mr. Hasan,

    I will suggest you to specify some technical information about the conveyor and scraper such as :
    1) Belt width
    2) Belt speed
    3) troughing angle
    4) Capacity (mtph)
    5) Conveyed material name
    6) Material size
    7) Moisture content
    8) Bulk density
    9) Scraper type / arrangement

    The above information will help the respondents like Mr. Gerald Coenen to give you a more appropriate and useful suggestion for you.

    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

  4. #4
    HASAN KAZMI Guest
    Dear Mr. Mulani

    Following are the details of cnveyor belt system:

    Belt Width: 2Feet
    Belt Speed: 60FPM
    Troughing angle: Base 18inche, trough of 3inch on each side at 45degree.
    Capacity: 6TPH
    Conveyed Material: Detergent powder
    Moisture content: 3-8%
    Bulk Density: 300Gm/Lt to 650 Gm/Lt
    Scraper Type: Tried vertical teflon blades installed at both ends unders rollers.

    The belt is reversible. Another problem is that the powder also gets accumulated over rollers and is very difficult to clean.

    Hope to have some good advice.

    Thanks

  5. Belt Tracking

    Use belt tracking carry idler frames with
    HDPE covered rolls.

    Urethane covered rolls should also work
    provided the material is not acidic
    (HDPE is cheaper but does not last as long
    as urethane)

    www.lorbrand.com

  6. #6
    Join Date
    Aug 03
    Posts
    3
    I would think that Pakistan is somewhat similar to Mexico, where I am at, in industrial technology... most of the time "first world" solutions never work, simply because this are considering that the actual conveyor and chutes are manufactured to CEMA standards. And most of the time, chutes are non existant and the conveyor was made by the local welder.

    First of all, when dealing with belt misalignment, having a beltcleaner that works is only part of the solution and maybe not even that.

    Have you tried cleaning the idlers and then running the belt and checking if it continues to misalign. If so, then what you need is an efficient belt cleaner.

    Belt cleaners come in different shapes and sizes but all fall into the following 3 categories:

    Precleaner: Soft blade (urethane, rubber, etc..) installed right at the pulley and acting against the belt direction equiped with an elastomer or spring tensioning device to keep the blades on the belt.

    Scraper: Hard blade (tungsten, steel, etc...) installed right after the pulley and acting either perpendicular to the belt or with a slight angle in the direction of the belt travel equiped with a spring, bladder, elastomer, or a flexible cleaning blade for tensioning the scraper and keeping the blades in contact with the belt.

    This two types of belt cleaners are manufactured by many different companies and all work well like Martin Engineering, Hosch, Flexco, Arch (Gordon), etc... and of course CTS (manufactured by us)

    Usually the problem is not the belt cleaner but the installation. It is obvious but many times overlooked: A belt cleaner not properly installed will not work properly.

    The third category is what we call "home made" which is a piece of rubber, old belt, etc... just forced to the belt acting as a scraper...this do not work, even if they do for the first 2 days, they will eventualy not work.

    For a reversible belt, most precleaners would not work because this work against the belt travel and would brake any splice not properly vulcanized, which are fairly common. And on the scrapers
    , you will be limited to those scrapers that act perpendicular to the belt, and this most of the time are too abrasive damaging the belt or the ones having a flexible blade.

    I would recomend 2 scrapers acting with a slight angle with flexible blades, each at a different puley. And both installed by people who know what they are doing. When traveling in one direction one scraper cleans the belt and the other just glides not attacking either the belt or it's splice since the blade is flexible, and this is reversed when traveling in the other direction.

    NOW..if the belt is misalianging for another reason that is not carryback material stuck to the return idlers, that is a whole other problem that can be any of the following reasons:

    Defective or worn belt
    Idlers installed at a slight angle
    Pulleys at a slight angle
    Incorrect splices
    Material feeding of center
    Conveyor structure not straight

    You might try instaling auto alignement idlers, but this rarely work if the misalignment problem is too big.

    I would recomend to check for the obvious like Pulleys and idlers not perpendicular with belt travel, and if this does not work... the best solution is to install vertical idlers every 1 or 2 meters and simply force the belt to work properly, This would in time damage the belt... but would be less expensive that correcting a bigger problem like a defective conveyor structure.

    Good luck!

  7. Mr. Hasan Kazmi,

    Following features can reduce your difficulty:

    1) Use rubber lagged pulleys. You are handling detergent which is non abrasive. So, you can have 8mm thick rubber lagging on pulleys/.

    2) Use carrying rollers having 5 mm thick rubber lagging

    3) Use return rollers of rubber disc type

    4) Use external scraper and internal scraper at both the ends. The scraper blades should remove / shave off the material rather than converting it into paste. So, proper type of blade and proper pressure is necessary

    5) Rollers should not be unnecessarily big in diameter. Lesser diameter means more centrifugal force for same peripheral speed. This improves the self-cleaning.

    Rubber means flexible surface, so material automatically gets dislodged from rollers / pulleys (this is like car-tyre tending to remain clean as built up is on shaky surface i.e. rubber).

    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

  8. Just my two cents.
    I agree with some comments from the previous posters and strongly disagree with others.
    In most cases the local welder is as good as one can get because even if a system from a preferred company is installed, the local welder ends up performing the task most of the time.
    Most belt cleaners lack performance because the systems are over simplistic and not adquate for the task. As an example in this thread five people provided opinions yet the belt material was never considered or mentioned.
    In general I consider three types of belt cleaners; Scrappers or plows, counter rotating/surface profiled rolls and liquid/air belt washer systems.
    All types are efficient in those applications were the designer and integrator condidered the system as an integral part of the bulk transfer system and not an after thought.
    I designed and installed several systems and unfortunatly never in a situation where I could get a catalogue and order an "off the shelf" unit.
    In every scraper type cleaner there is pressure between the belt and the scrapper creating the possibility for wear and mistracking. As the adhesion of the bulk material to the belt increases, the attack angle of the blade and the pressure it exerts on the belt also increases to be able to remove the material. It is wise to design a cleaning system customized to the process requirements optimizing for the usable life of the system.

    Antonio Reis
    Vitrom Mfg Consultants
    www.vitrom.com

  9. Mr. Hasan Kazmi:

    It appears that you have both a carryover and a spillage problem, which is giving you a third problem of belt mistracking.

    You also mentioned that this system is reversible. Is the problem of mistraining worse in one direction, or do you have serious mistracking both ways?

    In general, carryover is controlled by using cleaners on, and just after the discharge pulley(s). Also, carryover, if not controlled, will build up on the return idlers and can cause mistraining on the return run and at the start of the carry run. That is, carryover should not cause build-up of material on the carry (troughed)
    idlers. If you are experiencing materiual build-up on the carry idlers, it is more likely to come from spillage.

    Having said this, you can try to eliminate carryover by upgrading your belt cleaners. The fact that your belt is reversible will limit your choice of cleaners. As others have pointed out, cleaners are only as good as their installation and maintenance. If you can not eliminate or control carryover, you can try to minimize the effect by the methods suggested by Dr. Mulani. In addition to the points he suggested, you can try using scalper blades on the built-up idlers to scrape off the contaminate. If you do, use drip pans to catch or deflect the material away from the conveyor.

    As always, it is difficult to make suggestions without observing the system. Because of this, it may be helpful for you to call in representatives of your local belt service companies, consultants, or cleaner manufacturers. Evaluate their recommendations and proceed accordingly.

    Good luck!
    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

  10. Dear Sir,

    have a look to our
    www.vsr-industrietechnik.de

    We await your detailed inquiry.

    Thanks in advance
    VSR Industrietechnik GmbH
    Export Manager
    Wolfgang Schlabach

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