Abstract
When we transport rocks or coals by means of conveyor belts, we usually drop them onto a running belt, and transport them. In this case, the conveyor belt receives shocks repeatedly from rocks or coals falling down. If the shock exceeds a certain level, it causes the conveyor belt breaking dowa. Design of conveyor belt world be substantially convenient if the stress and elongation of the belt at the time of receiving shocks is clearly found out.
For this purpose, we took photographs to examine the relation of partial elongation of the belt, the number of plies, property of the belt cover, and edge angle of falling materials.
