The machine is composed of hopper, oscillating chamber, coupling and motor. The oscillating chamber consists of eccentric wheel, rubber software, spindle and bearing. 

The adjustable eccentric weight hammer is transmitted to the center line of the spindle through the motor drive, and the centrifugal force is generated in the unbalanced state, so that the material strength is changed and the track vortex is formed inside the sieve. The amplitude of the hammer adjuster can be adjusted according to different materials and screens. 

The whole machine has the advantages of compact structure, small volume, no dust emission, low noise, high quality, low energy consumption and convenient mobile maintenance.