HYDRAULIC PRESS Russian patent published in 2014 - IPC B30B1/32 B30B15/18 

FIELD: machine building.

SUBSTANCE: hydraulic press comprises an actuating cylinder, main and additional hydraulic intensifiers, a pump station, a system of distributors. The intensifiers are made as high and low pressure cylinders with plungers forming movable plunger blocks which are rigidly connected to each other. The system of distributors consists of a four-way three-position reversing slide valve and a three-way two-position slide valve. A system of eight back pressure valves, a system of six two-way two-position cut-off slide valves and a four-way two-position slide valve are provided in the press. The cavities of high pressure cylinders of each intensifier are separately connected to the piston cavity of the actuating cylinder through the sequentially installed back pressure valves and normally closed cut-off slide valves. One of the outputs of the four-way two-position slide valve is connected to the low pressure cylinder cavity in the main intensifier through the normally closed cut-off slide valve and to the high pressure cylinder cavity in the additional intensifier through the parallel installed back pressure valve and normally closed cut-off slide valve. The second output of the said slide valve is connected to the low pressure cylinder cavity in the additional intensifier through the normally closed cutoff slide valve and to the high pressure cylinder cavity through the parallel installed back pressure valve and normally open cut-off slide valve. The result is expanded process capabilities of the press and simplified control circuit for the main intensifier. The inputs of the said slide valve are connected to the drain and one of the outputs of the three-way two-position slide valve. Additionally the cavities of low pressure cylinders of both intensifiers are separately connected to a fluid tank and the piston cavity of the actuating cylinder through the back pressure valves.

EFFECT: continuous supply of fluid to the working cavity of an actuating cylinder at any initial position of the movable plunger block, simplified press control and expanded process capabilities.

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