Belt conveyor is a continuous transportation machinery that uses conveyor belts as traction and load-bearing components. The conveyor belt is wound around the driving drum and various directional drums, and is given appropriate tension by the tensioning device. During operation, under the drive of the driving device, the conveyor belt is operated by the friction and tension between the drum and the conveyor belt. The materials are continuously delivered to the conveyor belt and move together with the conveyor belt, thereby achieving the transportation of the materials.