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Thread: Apron Feeder Design

  1. #1
    Rachana Guest

    Apron Feeder

    Hello to all,

    I am quite new to bulk material handling equipment design. Now a days I am working on Apron Feeder.

    I have two Queries:
    1. How to decide pitch of chain for a apron feeder. In otherwords how to design chain for apron feeder.

    2. If we have to Design a inclined apron feeder having 20 deg inclination & lump size of feeding material (-600mm) is very high then how to ensure that material won't role back at such inclination.

    Waiting for your precious guidance.

    Thanks & Regards,

    Rachana

  2. apron feeder questions

    Your question has a problem attached to it,
    you have not told us what you are conveying as far as bulk product etc.

    An apron feeder is ment to be horizontal in discharge. I have never seen an apron feeder discharging at an incline in 28 years.

    The conveyor belt which takes away the material is either horizontal or at an incline to take away product from the apron feeder for the simple reason that it runs at a higher RPM than the apron feeder- the apron feeders are set through a reduction gear for a reason- very low rpm/high torque to move material en mass across the feeder width and length and out of the hopper. Also the feeder may or may not have a restrictor plate across the width of the feeder to slow material feed rates to the take away conveyor-due to the high volume potential.

    Do not forget that the apron feeder is using huge amounts of torque to the final drive and sprokets to drive the feeder.

    You should look at what is already available in
    apron feeders as the manufacturers have done all the design work and testing etc.

    lzaharis

  3. #3
    A. R. Singh

    A. R. Singh, B.Sc. Engineering

    Engineer

    MODTECH PROJECTS INDIA Pvt. Ltd.

    MODTECH PROJECTS INDIA Pvt. Ltd.

    Inclined apron feeder

    Dear rachna
    even if you provide inclined apron feeder 20 degree inclination will be too steep for 600 mm lumps and same will slide back
    A R SINGH

  4. #4
    Rachana Guest

    apron feeder

    To : A R SINGH

    Dear Sir,

    Because of experience, you know that -600 mm lump size will roll back in apron feeder at inclination of 20 deg.

    But I want an analytical method by which atleast approx. we can calculate the probabilty of fall.

    There is formula Tan A
    where A=angle of inclination
    MUI= coefficient of friction.

    Can you you tell its modified form which can give above result.

    Thanks for your quick response.

    Rachana

  5. #5
    A. R. Singh

    A. R. Singh, B.Sc. Engineering

    Engineer

    MODTECH PROJECTS INDIA Pvt. Ltd.

    MODTECH PROJECTS INDIA Pvt. Ltd.

    APRON FEEDER

    DEAR RACHNA
    YOU CAN FIND MAXIMUM INCLINATION IN CEMA FOR DIFFERENT MATERIALS
    A R SINGH

  6. #6
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc.

    Conveyor Dynamics Inc.

    Professional Experience 62 Years / 8 Month Lawrence K. Nordell has 62 Years and 8 Month professional experience

    Discussions 302 Lawrence K. Nordell acceded to 302 discussions, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Know-How Design (1524) Lawrence K. Nordell used this tag 1524 times, Pipe Conveyor (239) Lawrence K. Nordell used this tag 239 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Dear Sirs:

    Modern apron feeders are used to feed primary gyratory crushers from a truck dump pocket such as used in copper mining. The material is transported up an incline of 20-22 degrees and discharged into the crusher bowl. The angle may vary slightly. There are many such installations in North and South America.

    There are many aspect to a proper design learned over many years. I would not advise to make a design from scratch. Especially since the physics is not known to you based on your question. There is much to know of such a design beyond some simple geometry.

    Seek a reputable manufacturer of such equipment including Krupp, FFE Minerals, ManTakraf, Metso and others.
    Lawrence Nordell
    Conveyor Dynamics, Inc.

    website, email & phone contacts:
    www.conveyor-dynamics.com
    nordell@conveyor-dynamics.com
    phone: USA 360-671-2200
    fax: USA 360-671-8450

  7. #7
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc.

    Conveyor Dynamics Inc.

    Professional Experience 62 Years / 8 Month Lawrence K. Nordell has 62 Years and 8 Month professional experience

    Discussions 302 Lawrence K. Nordell acceded to 302 discussions, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Know-How Design (1524) Lawrence K. Nordell used this tag 1524 times, Pipe Conveyor (239) Lawrence K. Nordell used this tag 239 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    You can likely find apron feeder literature references in the Australian iron ore industry as well. These feeders usually feed a jaw crusher.

    THese sites have a very simple open loop circuit from: truck dump pocket, apron feeder, primary crusher, to belt conveyor.

    THe Apron feeder flight pitch permit small granular material to pass between flights and directly bed the short intermediate inspection and weightometer collecting belt conveyor. THe over and undersized product is then discharged onto an overland.

    Use your BSH search engine to become more informed.
    Lawrence Nordell
    Conveyor Dynamics, Inc.

    website, email & phone contacts:
    www.conveyor-dynamics.com
    nordell@conveyor-dynamics.com
    phone: USA 360-671-2200
    fax: USA 360-671-8450

  8. #8
    Rachana Guest

    Chain for Apron Feeder

    Dear Nordel & lzaharis ,

    Thank you for the information.

    I want analytical formula for probabilty of fall because it always good for engineers to do analytically. Somewhere it gives confidence in our design that it is optimally designed.

    Kindly send me the criteria or factors on which we can select the pitch of the chain.

    I gone through few designs of Apron feeder. Almost all having chain of pitch 300mm,400mm & 450mm. And Sprocket have nearly 7 to 9 teeths.

    Is this is the only range of pitch one can use or there is some criteria to decide it. For Designing a chain atleast we should have "pitch" as input.

    If posseible, please send any small example or recommend any technical papers or any other source of information.

    Thanks & Regards,
    Rachana

  9. #9
    Rachana Guest

    BSH Search Engine

    To : Mr. Nordell

    Hello Sir,

    Can you tell Slightly more about "BSH search engine"... It will help me to search better. Google and other search engines are not giving proper results for above.

    Regards,

    Rachana

  10. Hello Rachana,

    The apron feeder design exact procedure cannot be explained in this forum. Various resistances are to be calculated to decide the chain pull, power, etc. The chain pitch will be the consequence of apron feeder size and chain pull. If you are a buyer you can make some design as a check / feel, however, if your design requirement is for manufacturing, it is a specialised subject.

    Referring to the installation list of a premier German company also known for manufacturing heavy duty crushers and apron feeders, they have often given apron feeders for handling limestone, for inclination up to 25 degree. The limestone being handled is often large in excess of 1m size. The apron feeder has uneven conveying surface and hence its capability to support the material on inclined zone is different then smooth surface conveyors.

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

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