Results 1 to 8 of 8

Thread: Long Reversible Conveyor

  1. #1
    ash_bhatnagar Guest

    Long Reversible Conveyor

    I AM TO PLAN A REVERSIBLE CONVEYOR OF ABOUT 300 M IN LENGTH.THIS IS HORIZONTAL CONVEYOR.

    WHAT TYPE OF DRIVE ARRANGEMENT IS PREFERRED FOR THIS.WHAT TYPE OF TAKEUP TO BE ADOPTED.

    ANY REFERNCES FOR SUCH LONG REVERSIBLE CONVEYOR?

  2. #2

    long reversible conveyor

    First we should have more information.

    1. - Is the load the same in both directions?
    2. - Is the speed the same in both directions?
    3. - Are there any inclines / declines in the system?

    Problems you can encounter are:

    a. - Belts are normally trained in one direction - when reversed you introduce a completely different set of loads on the idlers causing mistracking in the opposite direction. This can be corrected with special training idlers designed for reversing conveyors.

    b. - Belt scrapers can be a problem when reversing belts.

    c. - Backstops are not able to be used when reversing belts.

    d. - Skirt boards can act as ploughs throwing material off the belt.

    I am sure others will have more info to add to this but these are from my own experiences.

    Regards,

    Gary Blenkhorn

  3. Dear Shri A K Bhatnagar,

    Mr. Gary Blenkhorn has drawn your attention to very important issues concerning the reversible belt conveyors. This needs to be taken care of while deciding the technical features of the belt conveyors. In addition, please take special care for proper tolerances in fabrication and erection of the conveyor.

    Regarding the type of drive and take-up, I would like to inform you as below :
    1) For 300 m horizontal reversible conveyor, it is better to have drive unit at both the ends (one can also design such conveyor with drive unit at one end, but you will find the solution expensive).
    2) The both end drives will result in less variation (change) in belt tension whether conveyor is running in one direction or the other direction.
    3) You will observe that the belt tensions acting on most of the pulleys (which are on return run) are less. So economy in pulleys.
    4) You can have a gravity take-up or winch take-up. The conveyor is to be designed accordingly.

    It is probable that your conveyor may be a yard conveyor with stacker reclaimer machine (reversible) type. Many power stations in India have yard conveyors of 300 m to 600 m length, running in reversible direction, capacity range 500 mtph to 1200 mtph and at few places it is likely to be close to 2000 mtph. So, the issue is not uncommon and you can even see such installations.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

  4. #4
    ash_bhatnagar Guest

    Re: long reversible conveyor

    Originally posted by Gary Blenkhorn
    First we should have more information.

    1. - Is the load the same in both directions? Yes
    2. - Is the speed the same in both directions?Yes
    3. - Are there any inclines / declines in the system?No

    Problems you can encounter are:

    a. - Belts are normally trained in one direction - when reversed you introduce a completely different set of loads on the idlers causing mistracking in the opposite direction. This can be corrected with special training idlers designed for reversing conveyors.

    b. - Belt scrapers can be a problem when reversing belts.

    c. - Backstops are not able to be used when reversing belts.No back stop

    d. - Skirt boards can act as ploughs throwing material off the belt.

    I am sure others will have more info to add to this but these are from my own experiences.

    Regards,

    Gary Blenkhorn

  5. #5
    ash_bhatnagar Guest
    It is probable that your conveyor may be a yard conveyor with stacker reclaimer machine (reversible) type. Many power stations in India have yard conveyors of 300 m to 600 m length, running in reversible direction, capacity range 500 mtph to 1200 mtph and at few places it is likely to be close to 2000 mtph. So, the issue is not uncommon and you can even see such installations.

    Can u pl send me the details of some installations nearby

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916 [/B][/QUOTE]

  6. #6
    Vivek Guest
    Mr Bhatnagar

    It is possible to provide double take up of type "Horizontal Gravity Take Up" at one end of the conv. with a single counter weight tower and Reversible Drive unit.

    This arrangement is good if the conv is a reversible yard conv and is discharging only on one end. If the conv is discharging on both ends then you can consider intermittent drive near one end.

    It saves the cost of two drives, one at both ends of the conveyor and associated electricals.

    But the decision to go for a particular type of drive and take up arrangement will depend on conv capacity and speed.

    Vivek Chaturvedi
    email :vc@jsr.trfltd.com

  7. Reversing belt conveyors do present unique problems as far as cleaning, sealing, and tracking.

    1. Dual drives, one on each end allows for best tracking. Center drive location also works well.
    2. Ensure belt is selected correctly, PIW, trough angle, bend radius, transition distance, temperature, chemical resistance and ratio of top cover to bottom cover thickness. If not done correctly at the start, long term problems will occur that will make the belt virtually impossible to track.
    3. Martin Engineering supplies belt cleaners and reversing tracking devices that perform extremely well. For specific recommendations we would need specifics such as belt width, material conveyed, belt speed.
    Larry J. Goldbeck
    Martin Engineering

  8. Quote Originally Posted by I G Mulani View Post
    Dear Shri A K Bhatnagar,

    Mr. Gary Blenkhorn has drawn your attention to very important issues concerning the reversible belt conveyors. This needs to be taken care of while deciding the technical features of the belt conveyors. In addition, please take special care for proper tolerances in fabrication and erection of the conveyor.

    Regarding the type of drive and take-up, I would like to inform you as below :
    1) For 300 m horizontal reversible conveyor, it is better to have drive unit at both the ends (one can also design such conveyor with drive unit at one end, but you will find the solution expensive).
    2) The both end drives will result in less variation (change) in belt tension whether conveyor is running in one direction or the other direction.
    3) You will observe that the belt tensions acting on most of the pulleys (which are on return run) are less. So economy in pulleys.
    4) You can have a gravity take-up or winch take-up. The conveyor is to be designed accordingly.

    It is probable that your conveyor may be a yard conveyor with stacker reclaimer machine (reversible) type. Many power stations in India have yard conveyors of 300 m to 600 m length, running in reversible direction, capacity range 500 mtph to 1200 mtph and at few places it is likely to be close to 2000 mtph. So, the issue is not uncommon and you can even see such installations.

    Regards,
    Ishwar G Mulani.
    Author of Book : Engineering Science and Application Design for Belt Conveyors.
    Email : parimul@pn2.vsnl.net.in
    Tel.: 0091 (0)20 5882916

    Dear Mr. Mulani,

    would you please give us more information about reversible yard conveyor with stacker reclaimer machine.

    Thanks a lot.

Similar Threads

  1. Design of a Movable & Reversible Belt Conveyor
    By zxm99 in forum Silos, Hoppers, Bins, Bunkers & Domes
    Replies: 7
    Last Post: 8th May 2007, 14:45
  2. Fire Protection Measures in Long Overland Conveyors
    By Kayem in forum Fire & Explosion Protection, ATEX
    Replies: 3
    Last Post: 13th August 2004, 2:04
  3. Long Belt Conveyors
    By Kayem in forum Trough Belt Conveying
    Replies: 3
    Last Post: 5th March 2004, 12:10
  4. Reversible Impactors and Hammermills by American Pulverizer
    By Author in forum New Products, New Orders
    Replies: 0
    Last Post: 17th September 2003, 7:52
  5. Long Distance Conveying
    By ash_bhatnagar in forum Trough Belt Conveying
    Replies: 12
    Last Post: 7th July 2003, 2:31

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO