Load on idlers

Posted in: , on 13. Dec. 2005 - 11:45

Dear friends,

I have a question about the calculation of the normalforce on the idlers in the pipeconveyor. The load on the idler is the result of

1) The force excerted by the belt

2) the gravity force of the bulk

How can I best determine the force excerted by the belt?

I want to calculate the normalforce in order to determine the right diameter of the idlers.

Which formula?: I have adjusted the formula of bending of a plate, the result was for a pipe D=450 mm, about 820 N on the lower idler.

Other data:

thickness belt: 10 mm

E: 340MPa

thanks

with regards,

Sandjay ■

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Re: Load On Idlers

Posted on 13. Dec. 2005 - 09:57

See the prior posting in this forum title: Pipe Belt Rigidity ■

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

Re: Load On Idlers

Posted on 14. Dec. 2005 - 10:25

Dear mister Nordell,

Thanks for the reply. I have read the post, but I dont know how the visualize the forces on the idlers. Can u send me a sketch or drawing? I need a proper sketch for my thesis study for the maintenance of pipe-conveyors.

with regards,

Sandjay Kalidien

The Netherlands ■

Cema Or Din 22101

Posted on 15. Dec. 2005 - 04:45

Hi, I have another question.

Fot standard calculations, which of the standards: CEMA or DIN 22101 is preffered?? ■

Re: Load On Idlers

Posted on 19. Dec. 2005 - 04:30

The load carried by an idler on a straight belt run comprises two components

1 - theoretical - as good a model as makes sense

2 - practical - to allow for fudge factors such as idler misalignment, transfer of load from one to the other, local load surges etc.

On the theoretical side you can do some basic structural mathematics, or assume that the bottom idlers only will be acting. If you want better than that do a simple equivalent frame analysis with the belt ring as one component under load on selected supports, or Finite Element Analysis.

You can also model the longitudial belt reaction by a simple frame analysis over 3 or more frames. You can model what happens with a soft support - ie if one of the frames settles relative to the beltline.

Outside of that you have to allow a Design, Safety or Fudge Factor. ■

Load On Idler

Posted on 6. Dec. 2006 - 08:39

Daer Mr. Sanjoy,

Do the calculation based on BRIDGE STONE mannual or go for JPC. I am having both of them but how can I give you!

Regards.

A.Banerjee ■

Re: Load On Idlers

Posted on 7. Dec. 2006 - 06:29

Thanks mr. Banarje,

I have now sufficient information about the loading on the idlers, however maybe u could send me a video of a working pipe-conveyor?

For instance u could mail me to kalidien@gmail.com (maximum video-file-size 10 mb).

I would really appreciate it, if u could help me. ■