(1) Screening sorting mechanical equipment: Principle: According to the material geometry and particle difference, the material is sorted by a screen with perforations. Features: High grading efficiency, strong production capacity, no impact, little damage, accurate grading. Degree of automation: average.

(2) Mechanics-based sorting machinery: Principle: Material sorting is carried out according to the mechanical properties of material particles. Features: High classification accuracy, convenient adjustment and complex structure. Degree of automation; in general, some are not easy to achieve.

(3) Photoelectric principle sorting machinery: Principle: Material sorting is carried out according to the size and color of individual materials. Features: Small mechanical damage, accuracy is related to the speed of the transmission system. Degree of automation: high and easy to achieve.