A kind of large hydraulic press crossbeam leveling hydraulic system

The invention discloses a kind of large hydraulic press crossbeam leveling hydraulic systems, including active control hydraulic system and passive control hydraulic system, active control hydraulic system is made of a master cylinder and four secondary hydraulic cylinders, secondary hydraulic cylinder is by the first hydraulic oil pump feed, first hydraulic pump is connected with fuel tank by pipeline, the outlet of first hydraulic pump is connected with the first inserted valve by pipeline, the remote control orifice of first inserted valve is connected with two-position three way magnetic valve by pipeline, and the outlet of the first hydraulic pump is connected with the import of third inserted valve by pipeline.Pass through the active control hydraulic system and passive control hydraulic system and PLC controller being equipped with, it is plunger case among active control hydraulic system, remaining four cylinder is piston cylinder, each cylinder is individually driven by pump, each revolution speed is controlled by controller to change flow, realizes the needs of the friction speeds such as rapid decrease, pressing component and pressure maintaining.