Belt conveyor is the main transportation equipment commonly used in industrial and mining enterprises. It is a continuous conveying equipment that uses the conveyor belt as the traction and load-bearing member and carries out material transportation through the movement of the conveyor belt that carries the material. It utilizes the characteristics of internal friction and lateral pressure of the bulk material and is pulled by the driving roller in the direction of its movement in the tape groove so that the internal pressure increases and the internal friction between the particles become larger. When the inclination angle is within a certain range, this internal friction ensures a stable state between the material layers, forming a continuous overall movement. When the internal friction between the material layers is greater than the external friction of the tape, the rollers under the tape move forward together with the material, and when the ratio of internal and external forces meets certain conditions, the material flow is stable.