HYDRAULIC PRESS Russian patent published in 1997 - IPC

FIELD: plastic metal working. SUBSTANCE: given hydraulic press has immobile and mobile cross-pieces, two power cylinders and two return cylinders, hydraulic drive, system controlling synchronous movement of mobile cross-piece. This system includes double booster double reducer-meter and set of test and distribution hydraulic equipment and pickups checking positions of mobile members. Metering spaces of reducer-meter and boostermeter are connected to corresponding power cylinders. Inlet spaces of boostermeter and reducer-meter are connected through corresponding control valves to hydraulic drive and to drain. Pressure relay is connected to pipe-line of inlet space of reducer-meter. EFFECT: increased operational reliability and efficiency.