ZS series layered screen is suitable for flow operation, and it is an ideal equipment for continuous screening and discharging with different proportion of large and small particles. The machine is composed of hopper, oscillation chamber, coupling and electric machine. The oscillation chamber is composed of eccentric wheel, rubber cushion, main shaft, bearing, etc. The adjustable eccentric weight is transmitted to the center line of the main shaft through the motor drive. Under the unbalanced state, the centrifugal force is generated, which changes the material strength and forms the track vortex in the screen. The amplitude of the screen can be adjusted according to the size of the material. The whole machine has compact structure, small volume, no dust, low noise, high quality, low energy consumption, convenient movement and maintenance.