At present, the mesh screen changer can be divided into manual mesh screen changer , electric mesh changer, pneumatic mesh changer, hydraulic mesh changer and so on according to the power of mesh changer, among which hydraulic mesh changer is the most widely used. For manual mesh screen changer, electric mesh changer, pneumatic mesh screen changer ; according to the power of the mesh changer, the meaning is to use manual mesh changer, motor-driven mesh changer, pneumatic mesh changer, because th