For different screening function, there are several different types of screening machines, namely circular vibrating screen, rotary trommel screen, high frequency screen and linear vibrating screen. However the application of these Screening Machine is a little different, circular vibrating screen is mainly used for sand and Stone Crushing Plant, where the final sizes is relatively big, the usage of rotary trommel screen is almost the same as the circular vibrating screen, and both of them can be used as washing and screening machine when with water. For example, both of them can be used for placer gold washing purpose; high frequency screen can be used for a ore processing plant and the linear vibrating screen is mainly used for fine powdery material screening.