HYDRAULIC PRESS Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: press has bed 1 with main hydraulic cylinder 2, cavity 3 which is connected by hydraulic line 5 to working chamber 5 formed by piston 6 in cylinder 7 of single-piston pump 8. Plunger 9 is supported by slider 10 held in the upper position by spring 11. Damping hydraulic cylinders 12 and 13 which plungers 14 and 15 are fastened to table 16 of bed 1 are made in slider 10, plungers 14 and 15 form cavities 17 and 18 connected to each other by hydraulic line 19, and to accumulator 20 and drain valve 21. Drain valve 21 has gate 22 held in the open position by spring 23, pusher 24. The pusher has control chamber 25 which is in communication by hydraulic line 4 through check valve 26 and safety valve 27. The drain valve communicates with the casing of pump 8 which is a working fluid tank, by hydraulic line 28. Hydraulic line 4 communicates with casing 29 through bypass valve 30 controlled by electromagnet 31 through pusher 32. EFFECT: improved structure. 2 cl, 1 dwg