Apparatus and method for controlling driving of a ram of a hydra

Details Apparatus and method for controlling driving of a ram of a hydra Apparatus and method for controlling driving of a ram of a hydra

1996-05-23

1997-11-04

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Methods of operation

60428, 10026905, 10026916, 91461, F16D 3100, B30B 123

Patent

active

056827423

ABSTRACT:
Apparatus and method for controlling equipment of driving a ram of a hydraulic press. Four proportional sheet valves PA, PB, TA and TB are connected with a hydraulic circuit, in which a hydraulic cylinder 2 for driving a ram 1, a hydraulic pump 3 and so on are set up, a so as to form a full-bridge hydraulic circuit. A compression proportional sheet valve PAp and a hydraulic pump 40 are connected as a hydraulic power source with high pressure and small flow rate parallel with the sheet valve PA being in the oil supply position side in the hydraulic circuit. An NC controller controls timing of turn-on of the proportional sheet valves PA, PB, TA and TB as well as change of the valves PA and Pap by PWM signal to pilot valves of the sheet valves PA, PB, TA and TB. The valves PA and TB are turned on in the down stroke of the ram 1, the valves PB and TA are turned on in the up stroke of the ram 1, and the valve Pap is turned on in the compression stroke.

REFERENCES:
patent: 2666292 (1954-01-01), Biggert, Jr.
patent: 2790305 (1957-04-01), Towler et al.
patent: 3016005 (1962-01-01), Tomka et al.
patent: 4896594 (1990-01-01), Baur et al.
patent: 4924671 (1990-05-01), Reinert
patent: 5460084 (1995-10-01), Otremba et al.

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