Main description The machine is drived by a un-balance motor, which is with variable eccentric weights on both sides of motor shaft. , The screening time and movement of material on the screen surface can be controlled by adjusting the angle of the two eccentric weights. Features: 1.Screening machinery is one of precised powder sieve, it is of high efficiency, screening efficiency exceeds 90%. 2. It adopts whole sealing structure design to guarantee no dust pollution, no leaking liquid, no material left in machine, and no dead angle in the net frame. 3. Small noise and light weight, easy to be installed and maintained. 4. The outlet can be adjusted at any angle, and it is easy to replace the screen. 5. The rubber ball device can reduce the material jam on the screen. 6. By adding ultrasonic device, superfine materials up to 600 mesh can be sieved.