Hydraulic press drive

摘要

The drive has a work differential cylinder (1) with a work cylinder chamber (2), a back stroke cylinder chamber (3), and a rod (4) with a ram (5) connected to it. There is also an accumulator (6) for the hydraulic pressure medium, and a control device with control valves (9). There is a pressure conduit (10), between the back stroke cylinder chamber and the accumulator, with a pump (7) in it driven by an electro motor (8). There is a large (11) and a small (12) differential cylinder in the conduit, both of which have a cylinder space with a large piston surface and an annular space with a small piston surface. The rods of the two differential cylinders are joined to one another.