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Thread: Belt Weigher

  1. #1

    Post belt weigher

    We are seeking to install a belt weigher to meassure the material capacities. The conveyor of 650 bw is 200m long at 9 degree inclination running at 1.7m/s and carrys 110 TPH. The material is UREA BULK granulars of 0.7t/cu.m density.

    The accuracy we need is 0.25.

    -Is it possible to get this accuracy?
    -Any disadvantage if belt weigher installed at inclined portion?
    -What are the points that can cause belt weigher inaccuracy?
    -How we can conclude that the material carried out is within the limits after dead load caliberation.

    please comment

    Grandhe Ramesh

  2. #2
    Marco Aurelio Flores-Verdugo

    Marco Aurelio Flores-Verdugo

    Consultant

    Tecmen S.A. de C.V.

    Tecmen S.A. de C.V.

    Professional Experience 3 Years / 4 Month Marco Aurelio Flores-Verdugo has 3 Years and 4 Month professional experience

    Discussions 280 Marco Aurelio Flores-Verdugo acceded to 280 discussions, Articles 0 Marco Aurelio Flores-Verdugo wrote 0 articles, Publications 0 Marco Aurelio Flores-Verdugo Flores-Verdugo released 0 publications

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    Know-How Design (142) Marco Aurelio Flores-Verdugo used this tag 142 times, Pneumatic Conveying (80) Marco Aurelio Flores-Verdugo used this tag 80 times, Training (15) Marco Aurelio Flores-Verdugo used this tag 15 times

    Unhappy Belt weigh meter

    Very difficult. belt tension does affect your readings. and this is not what you say a constant value. even in horizontal conveyors. The longer it is the more un precise it gets.

    If yow can isolate yourselves from the long sloped conveyor and buy a load center with its own short belt. or weigh before or after the sloped conveyor.

    Good luck. Marco Flores
    TECMEN
    Consultant in:
    Sponge Iron (DRI) handling
    Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis
    Pneumatic Conveying Consultants
    Phone 5281 8300 4456.

  3. #3
    MTallevi Guest
    Dear Mr. Grandhe

    Your accuracy requirement of 0.25% is very possible and has been achieved in numerous applications.
    If you can send me details of your application we can assess it and / or put you in touch with our experts in Singapore.

    Please download the application form from
    http://www.siemens-milltronics.com/p...a/F2-406R7.doc

    and return to me at mike.tallevi@siemens.com

    Regards

    Mike Tallevi

  4. #4
    p w chase Guest
    Your accuracy requirement of 0.25 percent is marginally achievable. An iomportant factor is the availability of on-site weighing to perform the calibration. Suggest you contact CST in Australia as they have a number of approved scales.

    email iburrell@controlsystems.com.au

    best regards

    P W Chase

  5. none
    Last edited by Dianaglobal; 10th September 2003 at 20:34.

  6. #6
    Marco Aurelio Flores-Verdugo

    Marco Aurelio Flores-Verdugo

    Consultant

    Tecmen S.A. de C.V.

    Tecmen S.A. de C.V.

    Professional Experience 3 Years / 4 Month Marco Aurelio Flores-Verdugo has 3 Years and 4 Month professional experience

    Discussions 280 Marco Aurelio Flores-Verdugo acceded to 280 discussions, Articles 0 Marco Aurelio Flores-Verdugo wrote 0 articles, Publications 0 Marco Aurelio Flores-Verdugo Flores-Verdugo released 0 publications

    Searching nothing specified

    Know-How Design (142) Marco Aurelio Flores-Verdugo used this tag 142 times, Pneumatic Conveying (80) Marco Aurelio Flores-Verdugo used this tag 80 times, Training (15) Marco Aurelio Flores-Verdugo used this tag 15 times

    Unhappy

    Be carefull.

    belt scales in long slopped conveyors can work well in the first year .

    Then , you have to account for stuck iddlers, , crusting and all kinds of real world factors, again the shortest the conveyor the best.

    marco
    TECMEN
    Consultant in:
    Sponge Iron (DRI) handling
    Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis
    Pneumatic Conveying Consultants
    Phone 5281 8300 4456.

  7. 1/4% scales are indeed possible, but I have to agree with Mr. Flores. Urea and any of the fertilizer products can be extremely hard on bearings and structures. You may want to consider the solid roll type idlers, and possibly a stainless steel scale carriage.

  8. Dear Shi Ramesh Grandhe,

    The belt weigher you are looking for is mostly possible. The generally used accuracy is 0.5%. However, accuracy of 0.25% is not uncommon.

    You can install the belt weigher on 9-degree incline conveyor, if the said inclination is conveying the material without slippage.
    The belt weigher accuracy is affected if it is installed in convex or concave curvature, because in this situation the belt tension and its variation will affect the load on weighing idler. The load on weighing idler should only be due to gravity for accurate measurement.

    As mentioned by other respondents, you have to choose the material of construction immune to the chemical effect. The incrustation of material on weighing platform, idler etc. should be prevented and it should be regularly cleaned.

    There are well known routine calibration methods. The manufacturer and supplier of belt weigher can provide you the required information. Present day electronic belt weighers have inbuilt auto-calibration system.

    The load cell accuracy will be of much higher order (close to 0.1%). However, the accuracy we are referring to is for the belt weigher as a system. You can get better accuracy by longer weighing platform with more numbers of idlers on the platform.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 25882916

  9. #9
    lenvno Guest
    Dear Shi Ramesh Grandhe,

    A multi-idler belt scale is not the only method of accuratly weighing this material. Comptrol manufactures a belt scale, Model 15B Headweigh, which mounts on the head pulley of the conveyor and can provide an accuracy in the range of 0.25%. Belt scale materials or buildup on idlers is not an issue with this device. If you are interested in this technolgy, more information is available from our website at www.comptrol.com or we can have our representative in your area contact you.
    Please let me know if I can be of assistance.
    Regards,
    Len Vienneau, President
    Comptrol Technologies Inc.
    lvienneau@comptrol.com

  10. belt weigher

    Is it OK to know the volume? We supply a Volume Measure System with an accuracy of 0,25% in fine powders.
    This system is free of maintenance, has no influence by the inclination, belt tension or what so ever.
    Look at www.jh.nl, swith to English, look at Volume Measure System.

    kind regards,

    Jur Lommerts

    Jansen & Heuning Bulk Handling Systems
    www.jh.nl

    tel: +31 50 3126 448

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