The purpose of the screening equipment is: in the concentrator, pre-screening and inspection screening are carried out in conjunction with the crushing operation, and the preparation screening before the sorting operation; in the crushing and screening plant, it is used to divide the materials into various Independent screening of granular products; in addition, it can also be used for auxiliary operations such as dehydration, desliming and de-medium removal. The main types of screening equipment commonly used in concentrators are: vibrating screens, fixed screens, roller screens, cylindrical screens, curved screens and fine screens.