it is windely used in crushing and screening production lines in the following industries : mineral , quarry , metallurgy , building materials , chemical industry .ore dressing , coal mine and so on .

it takes the movable parts , such as sieve box and vibration device , to move compulsorily and sucessively just like a circle or a similar one , under the function of the centrifugal force occurred from the revolution of the eccentric block in the vibration device . the stuff moves with the cintinuous parabolic movement on the inclined screen surface , along with the sieve box . when thrown up , the materials are classified ; when falling , they pass through the screen .