The machine cosist of hopper,vibrating chamber,connecting shaft,and electric motor.There are eccentric wheel,rubber software,main shaft and shaft-bearing in the vibrating chamber.When the adjustable eccentght is passed the center of main shaft by motor driven,it may be out of balace and causes eccentricity,and so that the materials form regular eddy.The amplitude of the weight asjuster mayregulate by changing the different material and the meshes of screens.It is small in volume,thightnedd,dutness,noise-free,high output,low in energy,easy to move and easy to maintain.