Single plate and double plate, single and double column hydraulic screen changer , quick screen changing, easy operation and maintenance. With built-in sealing device, the sealing performance is good, which can meet the production of arbitrary polymer high extrusion capacity, and can be used with different standard extruders. The time for fast changing the network is less than 2 seconds, and the filter area is selected between 30mm- and 250mm. High abrasion resistance, high pressure resistance a