About Dahan circular vibrating screen: 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. Advantage 1.Save time(3-5 minutes to complete screen replacement). 2.Save manpower, for change screen just two people. 3.Increase fluency production line. 4.Increases screen life, bouncing ball does not directly strike mesh. 5.Increase the screen using area. Vibration screening·filtering machine function and principles The basic principle of vibration screening filter is through installed hammer by the motor shaft at both ends,the rotary motion of the motor into a horizontal, vertical, inclined Three-D movement,then this campaign to convey to the screen surface. If you change the phase angle at both ends of the hammer can change the direction of travel of raw materials.