VERTICAL PRESS MOVING CROSS MEMBER HYDRAULIC DRIVE Russian patent published in 2019 - IPC B30B15/16 

FIELD: machine building.

SUBSTANCE: invention relates to pressing equipment. Hydraulic drive comprises working and return hydraulic cylinders, hydraulic control valves of these hydraulic cylinders, pressure hydraulic line connected to hydraulic power supply source, drain hydraulic line connected with hydraulic tank, which is under atmospheric pressure, and additional hydraulic cylinders. Output links of all hydraulic cylinders are connected with movable crossarm. Additional hydraulic cylinders are installed opposite to working hydraulic cylinders. Working cavities of additional hydraulic cylinders are connected to each other and by means of the first and the second additional two-line two-position controlled valves are connected with working cavities of working hydraulic cylinders and with drain hydraulic line. By means of the third additional double-line two-position controlled valve the working cavities of return hydraulic cylinders are connected to working cavities of working hydraulic cylinders. Between discharge channel of hydraulic control valve of working hydraulic cylinders and drain hydraulic line there is a support check valve.

EFFECT: as a result, there is no need to coordinate movements of moving press crossbar and output links of additional hydraulic cylinders, which makes it possible to simplify control of hydraulic drive.

1 cl, 1 dwg