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mechanism Flexible Belt

ptc-46674
1-Newbie

mechanism Flexible Belt

I am trying to simulate a flexible conveyor belt with attachment lugs on the outside of the belt traveling around a pulley.

Has anyone come up with a technique in mechanism to show the movement of a belt traveling around a pulley ?

I searched and found information for showing a chain and sprocket in mechanism, this was not to difficult to do "bicycle chain links traveling around a sprocket", but I can't figure out how to simulate a totally flexible belt.

thanks in advance for any advice on how to accomplish this mechanism.

Dave McClinton

Mckesson Automation

david.mcclinton@mckesson.com

724 741 7760



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3 REPLIES 3

I contacted PTC Tech support regarding this a few days ago and they just got back to me with the answer...No you can't exactly do this Totally Flexibly belt. see their response.

"You will not be able to model the belt with the flexibility required, as Pro/ENGINEER creates only rigid models and doesn’t allow for deformation. But there is a document that will help you animate the motion."

and they pointed me to this link which shows a tank track in motion, cool but not exactly what I need.

http://www.ptc.com/cs/cs_25/howto/apm11043/apm11043.htm

Thanks

Dave




In Reply to Dave McClinton:

I am trying to simulate a flexible conveyor belt with attachment lugs on the outside of the belt traveling around a pulley.

Has anyone come up with a technique in mechanism to show the movement of a belt traveling around a pulley ?

I searched and found information for showing a chain and sprocket in mechanism, this was not to difficult to do "bicycle chain links traveling around a sprocket", but I can't figure out how to simulate a totally flexible belt.

thanks in advance for any advice on how to accomplish this mechanism.

Dave McClinton

Mckesson Automation

david.mcclinton@mckesson.com

724 741 7760


Thanks for posting that link Dave! I hadn't seen the tank tracks before.

I don't know how many times I came across the same situation that you have with belts! We typically use extremely small timing belts and end up modeling the behaviors with gear mechanisms and a simple extruded solid to represent the belt.

Even a simple chain can be really annoying if you want to fully model the functionality in Pro/E. I've done it, but my computer never likes it!

Joshua Houser| Pelco by Schneider Electric |Buildings & Business| United States| MCAD Tools Administrator
Phone: +559-292-1981 ext. 3490| Toll Free: +800-289-9100 ext. 3490&nbs

Last week 4/14/2010 I posted the following question:

I am trying to simulate a flexible conveyor belt with attachment lugs on the outside of the belt traveling around a pulley.

Has anyone come up with a technique in mechanism to show the movement of a belt traveling around a pulley ?

I searched and found information for showing a chain and sprocket in mechanism, this was not to difficult to do "bicycle chain links traveling around a sprocket", but I can't figure out how to simulate a totally flexible belt.

PTC tech support replied back to me with: "You will not be able to model the belt with the flexibility required, as Pro/ENGINEER creates only rigid models and doesn’t allow for deformation."

This was not an acceptable answer for me since I need to have a somewhat realistic simulation motion of a flexible belt to design the rest of my design around.

So here is the solution I came up with:

How to accurately show a flexible belt in motion using Pro/Mechanism

1. Create a simple model just basic curve to depict the pulleys / Gears and the belt travel.

2. Create a solid model of the lug profile that travels on the outside of the belt.

a. Add to this model a point at the center of the hole and the side datum plane

b. Also add a datum point at the vertex of the end point of the hole and the side datum plane.

3. Duplicate the solid model of the lug profile and just create datum curves that represent the shape of the lug.

a. To this model add datum points at the center of the lug and offset from the center at a distance of (lug pitch distance / 😎

b. also create a datum axis at the center of the lug

4. Create a assembly

5. Assemble the part curve that depicts the pulleys / Gears and the belt travel at the default location.

6. Assemble the solid model of the lug profile that travels on the outside of the belt, as a mechanism,

a. Planar “side datum plane to side datum plane”

b. Slot “Point at center of lug axis & datum curve that depicts the travel of the lug moving around the belt

c. Slot “point at vertex of lug dia.

7. Assemble the datum curve shape that represents the lug profile, as a mechanism,

a. Planar “side datum plane to side datum plane”

b. Bearing “the point (lug pitch distance / 😎 and the axis of the solid model of the lug.

c. Slot “point at the center of the datum curve lug and the datum curves that depicts the travel of the lug moving around the belt

8. Hide the solid model of the lug

9. Repeat assembly of the datum curve shape 7 x

a. This can be done by simply selecting the 1<sup>st</sup> instance & Selecting EDIT / REPEAT

b. Select the 2 “Point On Line” constraints and repeat until you have assembled 8 total instances in the model tree

10. Lastly assemble the solid model of the lug profile

a. Assemble by coordinate system to the last datum curve model.

11. Un-hide all models

12. Drag components around the curve.

Seems like a lot of steps but it really wasn't too hard !

I have attached a Zip file with the models and word document of the instructions.

Thanks to all those who replied back to my original post and if you have a need to do this now or in the future post back to this thread and I will be happy to assist you in anyway I can.

Regards

Dave McClinton

Sr. Mechanical Designer / MCAD Systems Administrator

McKesson Automation

724 741 7760

david.mcclinton@mckesson.com


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