Hydraulic circuit for driving a ram of hydraulic press

Details Hydraulic circuit for driving a ram of hydraulic press Hydraulic circuit for driving a ram of hydraulic press

1995-10-06

1997-03-18

Nguyen, Hoang

Motors: expansible chamber type

Differential

91435, 91437, 91458, 60494, F15B 1517, F15B 1104

Patent

active

056112599

ABSTRACT:
The hydraulic circuit directional control valve 20 is provided in a line connected with a lower chamber 13 of the hydraulic cylinder 1 and the B-port of the servo valve 3. A check valve 22 permitting oil flowing into the P-port of the servo valve 3 from the lower chamber 13 is provided in the line in parallel with the hydraulic circuit directional control valve 20 and connected with the lower chamber 13 and the P-port of the servo valve 3. When making the ram 15 move downward with high speed, the hydraulic differential circuit is constituted by changing the hydraulic circuit directional control valve 20 such that the delivery oil exhausted from the lower chamber 13 returns to the P-port of the servo valve 3. The hydraulic oil supplied from the hydraulic pump 1 flows into the upper chamber 12 through the servo valve 3. The delivery oil exhausted from the lower chamber 13 returns to the suction side of the P-port of the servo valve 3 through the check valve 22, assisting the flow rate of the hydraulic pump 2.

REFERENCES:
patent: 2683966 (1954-07-01), Tyler
patent: 3685531 (1972-08-01), Byford
patent: 4342256 (1982-08-01), Andersen et al.
patent: 4680929 (1987-07-01), Mouri et al.
patent: 4819541 (1989-04-01), Pitsch et al.
patent: 5007544 (1991-04-01), Saotome et al.

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