Anti-leakage structure for plunger rod of filter of extruder

The utility model provides an anti-leakage structure for a plunger rod of an extruder filter. The anti-leakage structure effectively solves the problems that in the prior art, leakage is prone to occurring around a plunger rod, the sealing effect is poor, and a sealing ring is seriously abraded. According to the technical scheme for solving the problems, the plunger rod comprises an extruder body and a plunger rod, the plunger rod is sleeved with a rubber sleeve, the body is provided with an annular groove, the rubber sleeve is arranged in the annular groove, the body is provided with a through hole corresponding to the annular groove, the through hole is formed in the front-back direction, the cross section of the through hole is rectangular, and double-end lead screws are arranged in the through hole in the front-back direction. The double-end lead screw is rotationally connected with the end of the through hole, the two ends of the double-end lead screw are connected with nuts through threads, the outer si