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Thread: High Speed Conveyor

  1. #1

    High speed conveyor

    I need to know, if troughed belt conveyor can be designed for high speed , say 3.5 m/sec and above. The conveyor will handle Limestone, 1.5 t/cu.mtr, lumpsize 0-75 mm. in conjuction with stacker. The belt width shall be 1000mm. The required capacity of the system( stacker & yard Conveyor) is 1350tph. The maximum inclination of conveyor is 16 deg.

  2. Dear Mr. Dalwadi,

    Please inform the length of this particular belt conveyor. These conveyors will be in series. The yard conveyor is likely to be longer and for that the speed will not pose problem. How about other associated conveyors?

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Email : parimul@pn2.vsnl.net.in

  3. Dear Mr. Dalwadi Udit:

    It is possible to design a troughed belt conveyor to handle speeds of 3.5 m/sec and above. A number of the lake boats on the Great Lakes (USA & Canada) utilize troughed belt conveyors running at speeds in excess of 5 m/sec. These vessels carry a variety of material -- including limestone.

    Of course, it is important that the conveyor framework, idlers, and pulleys are of sufficient strength and/or size to cope with the vibrations induced by high speed conveying. It is also wise to consider the safety implications which greater speeds will induce.

    Hope this helps.
    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

  4. #4
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

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    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Mr. Udit,

    You can go faster clear up to 6.5-7 m/s depending on the idler specifications. What is the point? You need about 750 mm belt when running at 5.5 m/s. This gives a 98 mm edge clearance.

    With a long belt, the higher speed can yield capital cost benefits. You have to optimize the process of CAPEX and OPEX for long belts.

    The design you posted is in the ball park. It gives a 150 mm free edge clearance distance which is quite liberal. If you have pick the 1000mm with and 3.5m/s speed, what is left to do?

    If you have to load on 16 degrees, then the speed is an issue as is the design of the transfer chute.

    You can go slower, given the 1000 mm width. You could go to 3 m/s. Idler trough angle is assumed to be 35 degrees. A 45 degree trough might be better, if you want a greater idler spacing. At 3m/s, yields a 126 mm edge clearance.

    Belt construction and idler spacing also gets in the mix. This leads to Mr. Mulani's question on belt length.

    There are other issues when considering the final design.

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    www.conveyor-dynamics.com

  5. #5
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Another note.

    Mr Mulani hinted at the problem with "other belts".

    Higher speed may give you grief when trying to stop them without piling up in the transfer chutes. Greater brakes and or flywheel conditions may become issues to control spillage at the transfer area.

    Transfer chutes take greater wear when controlling greater velocity. Dust and noise can become an issue.

    LKN from CDI

  6. #6
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 8 Month Lawrence K. Nordell has 58 Years and 8 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Searching nothing specified

    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Note 3:

    If your configuration is a yard belt to stacker, and the stacker must cast to give the maximum stockpile volume, then you want to go fast with the stacker.

    You also want to go fast with the yard belt to properly control the flow of limestone in the chute. To do this you need a curved chute to maintain the kinetic energy from belt to belt.

    We can help you get it right.

    LKN from CDI.

  7. The speed of 5 m/sec is common in many Coal Mines in Indonesia.
    But the complaints are the chute life and the Idlers life.Otherwise it is practical and many such plants in operation.
    We are involved in such a coal mine capacity increase by way of increasing speed, Chute works and related alterations.
    regards
    s.m.subra

  8. Belt speed 3.5 mps is not unusual and conveyor can be easily designed for that. But as I hinted, you may need to tackle the issue in totality of plant (i.e. related conveyors system).

    Speed also depends upon the quality of design and quality of components, machinery, and structures.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Email : parimul@pn2.vsnl.net.in

  9. Dear Mr. Dalwadi Udit,

    In my earlier two messages, I have already given some views on this topic. The belt speed is an ever green subject for all people concerned with belt conveyors, and often with differing views. Therefore considering importance of this issue; I am adding following information for better understanding.

    The belt speed issue is somewhat similar to issue of car speed. If you put question as to what is the permissible speed for car, a person from some place will say upto 200kmph is quite common, and we are widely using it. Whereas, some person from other place will say right speed is 100 kmph and anything beyond is madness. Then, whether the speed in question is with reference to highway or in-city is another point (i.e. long distance conveying or group of inter connected small conveyors). Therefore, the answer is subjective to quality of car, road, maintenance, replacement, sense of discipline / responsibility etc.

    Similarly, the allowable belt speed for conveyor is subjective in nature. The idlers with least imbalance, least out of roundness, belt of uniform carcass, excellent joint, idlers and components proper installation on xyz co-ordinate (all above in absolute numerical terms), proper limitation of belt sag, proper design for conveyor, and so on will affect the decision on belt speed.

    The present day more speed compared to speed in 60s/70s, is reflection of improved quality (i.e. my above statement). Therefore, conveyor designer is to decide for speed, in context to technical conditions. It needs to be decided in specific context.

    I also clarify that if there is belt speed limitation of say 3.3mps; no great change will occur whether it is 3.0mps or 3.6mps. That is the speed limit is not a rigid boundary. The belt speed is an important issue, and unfortunately it is not without complexities as it involves industrial quality culture from all concerned (i.e. designer, procurements, installation, maintenance supplier, user and so on)

    For material like limestone of (-) 75mm size, the material itself does not put restriction on speed 3.5mps, or even much higher than that. However, issue to be tackled in totality, appropriate to technically relevant conditions, as applicable for you.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyor
    Advisor / Consultant for Bulk Material Handling System & Issues.
    Email : parimul@pn2.vsnl.net.in

  10. #10
    Dear Mr. Nordell and Mr. Mulani,

    I believe both of you have much experience in dealing with high speed conveyors. However, from the discussion, I have not seen any specific information regarding those conveyors out there. Please could you mention several conveyors having speed more than 8 metres per second with the site/company name opertaing them? The reason I am searcing this sort of information is the intention to look at overland conveying speed up to 10 m/s.

    Thank you for any info you might have

    Best regards,

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