In various conveyors with flexible traction members, the tensioning device must be installed. The role of the tensioning device of the belt conveyor:
(1) The conveyor belt has sufficient initial tension to ensure the necessary friction between the conveyor belt and the driving pulley, and the frictional force has a certain reserve;
(2) compensating for the elongation of the traction member during the working process;
(3) Limit the sag of the conveyor belt between the supporting rollers to ensure the normal and smooth operation of the conveyor.
The tensioning device has the following structural forms: spiral, car and vertical.