CONTROL METHOD FOR HYDRAULIC OPERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: 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).

SOLUTION: 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.

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