To provide a control method for a hydraulic operation system for correcting the set pressure of a relief valve and capable of keeping pressure in a hydraulic circuit within a predetermined pressure without influencing on speed (flow rate).
The circuit is composed to suck in hydraulic oil from a hydraulic tank 6 storing the hydraulic oil by a hydraulic driving source 5, to feed the oil to a direction switching valve 3 and a hydraulic cylinder 2 via a pipe, and to return the oil to the hydraulic tank 6. The hydraulic driving source 5 is composed of a hydraulic pump 8 and a rotation speed variable type pump motor 9. The operation speed of the hydraulic cylinder 2 is set in advance by controlling the rotation frequency of the rotation speed variable type pump motor 9. The hydraulic cylinder 2 can be operated within a predetermined pressure by correcting the set pressure of the relief valve 4 to a corresponding value.
MANABE JUNJI
| JPH0566303U | 1993-09-03 | |||
| JP2004301189A | 2004-10-28 | |||
| JPH05146900A | 1993-06-15 | |||
| JPH06285936A | 1994-10-11 | |||
| JPS6353302A | 1988-03-07 | |||
| JP2003048016A | 2003-02-18 |
Jun Tsuruta
Tetsuro Shimada
Shinozaki Masami
Tanimitsu Masaharu
Yasushi Ohashi