This machine consists of a hopper, an oscillation chamber, a coupling and a motor. The oscillating chamber is composed of eccentric wheel, rubber software, main shaft, bearing and so on. The adjustable eccentric weight is transmitted to the center line of the main shaft through the motor drive, and the centrifugal force is generated in an unbalanced state, which changes the strength of the material and forms an orbital vortex in the screen. The amplitude of the weight regulator can be adjusted according to different materials and screens. The whole machine has compact structure, small size, no dust, low noise, high quality, low energy consumption, and convenient mobile maintenance.