| 摘要 |
FIELD: mechanical engineering.SUBSTANCE: invention relates to pressing equipment, in particular to hydraulic presses. Press moving cross-beam hydraulic drive comprises working and return hydraulic cylinders, said hydraulic cylinders control hydraulic control valves, pressure and drain hydraulic lines and working cylinders working cavities filling device when performing cross-beam approaching idle run. Said device includes low-pressure pump unit, which suction line is connected with hydraulic tank, and two-port filling valve made with electrohydraulic control and normally open flow section for working fluid passage in both possible directions. Two-port valve high-pressure channel is connected with working hydraulic cylinders working cavities. Low pressure channel of said valve is connected directly to pump unit pressure hydraulic line and with hydraulic tank by means of safety valve.EFFECT: as a result provision of design simplification of hydraulic drive is provided.1 cl, 1 dwg |
