Mechanical Engineering
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# Forces in a Conveyor Belt with Sliding Rollers

## Question

This sounds like a workbook problem, but I'm actually encountering it at work!

In this conveyor belt configuration, rollers P and R are horizontally aligned, while rollers R and S are vertically aligned, in a triangular arrangement. Roller Q then bends the belt between P and S.

Roller Q is free to slide vertically, while roller P slides horizontally. The remaining rollers R and S are fixed to their position. Of course all the rollers rotate with zero friction to allow the belt to move.

The system is in static equilibrium, held together by an applied horizontal force Fp at P and vertical force Fq at Q.

If I know all dimensions and geometrical relationships (angles, distances), how would I relate the belt tension T, and the external forces Fp & Fq?

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I suggest that you start with some FBDs for the movable elements. You will also need a constraint equation expressing the constant length of the belt. It is an interesting problem. Good Luck!

DrD

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