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

FIELD: technological processes.

SUBSTANCE: invention relates to metal forming. Press comprises power cylinder, pump station, hydraulic multiplier consisting of coaxially installed low-pressure cylinder and at least one high-pressure cylinder. System of distributors includes a four-way three-position reversible slide valve, the inputs of which are connected to the pressure and drain lines of the pump station. One of the outlets is connected to the return cavity of the power cylinder. In the system there is a three-way two-position slide valve, the input of which is connected to the second outlet of the reversible slide valve, the closed output – to the working cavity of the power cylinder, and the open output – to the low-pressure cylinder of the multiplier. Three-way two-position slide valves are connected to all high-pressure cylinders, their closed outputs being connected to the drain. Open outputs through normally open two-way two-position shut-off valve are connected to working cavity of power cylinder and through normally closed two-way two-position shut-off valve – with return cavity of power cylinder.

EFFECT: as a result, expansion of technological capabilities of press and reduction of installed capacity of pumps.

1 cl, 1 dwg