HYDRAULIC PRESS Russian patent published in 2020 - IPC B30B1/32 B30B15/16 

FIELD: metal forming.

SUBSTANCE: invention relates to the equipment for metal forming. Hydraulic press comprises piston power cylinder, pump station, hydraulic reduction gear and hydraulic multiplier. Multiplier has an inlet plunger cylinder and output plunger cylinders with plungers of different diameters coaxially with it. System of distributors includes four-way three-position reversible valve, two three-way two-position slide valve. To all output cylinders of the multiplier their inputs are connected three-way two-position slide valves, closed outlets of which are connected to drain, and open outlets through normally open two-way two-position shutoff slide valve are connected to working cavity of power cylinder and through normally closed two-way two-position shutoff valve with its return cavity.

EFFECT: as a result, it is possible to reduce setting power of pumps.

1 cl, 1 dwg