Thread Content
The selection of a conveyor must be based on actual application conditions, which includes the characteristics of the materials to be transported by the conveyor. It mainly explains the interaction between the items conveyed by the conveyor and friction. The internal friction angle of a conveyor, also known as the angle of repose, is the angle naturally formed between the cone surface and the horizontal plane when loose materials are piled up in a conical shape on a surface. The internal friction angle decreases as the particle size increases, and it increases as the humidity of the loose material rises; however, once the humidity reaches a certain level, the internal friction angle decreases instead. The internal friction angle for transporting materials varies between static and dynamic conditions, while for loose materials it differs depending on whether they are dry or wet. The external friction angle of a conveyor, also known as the friction coefficient, usually refers to the static friction coefficient – it is the friction angle between loose materials and surfaces made of various materials. The dynamic friction coefficient is generally 70% to 80% of the static friction coefficient. The loose material conveyed by the conveyor consists of solid particles, which have their own weight and therefore exhibit fluidity. The horizontal side pressure of loose materials is: Horizontal pressure = Vertical pressure × Side pressure coefficient. For water, the lateral pressure coefficient = 1 ； For loose materials, 0