Oil cylinder of roller press

The utility model discloses a roller press oil cylinder which comprises a cylinder body and a plunger inserted in the cylinder body in a sliding mode, a shaft shoulder is arranged at the tail of the plunger, the shaft shoulder is connected with the inner wall of the cylinder body in a sliding and sealing mode, the head of the plunger is sleeved with an end cover in a sealing and sliding mode, andthe end cover is fixedly connected with the cylinder body in a sealing mode. The roller press oil cylinder has the advantages that the plunger with the shaft shoulder design is adopted, the volume ofthe oil drainage cavity is increased, the pressure of hydraulic oil in the oil drainage cavity is reduced, the risk that the hydraulic oil leaks from the right end of the plunger is reduced, and due to the fact that the weight of the plunger is reduced, the pressure of the plunger on the elastic supporting assembly is reduced; the working reliability of the elastic supporting assembly is improved;in addition, the right end