The machine is made up of hopper, oscillating chamber, shaft coupling and electric motor. The oscillating chamber is furnished with eccentric wheels, soft rubber parts, main shaft and bearings inside. The adjustable prejudicial heavy punch is driven by motor and transferred to the spindle center line, which creates centrifugal force in the unbalanced state, changing the material strength and forms the orbital swirl inside the screen. The oscillation amplitude of heavy punch regulator can be adjusted according to the different materials and screen panel. It has a compact structure,small size, non dusting, less noise, high quality and low energy consumption. It is easy to move and maintain.