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RELIEF PRESSURE CONTROL DEVICE FOR HYDRAULIC WORK MACHINE
[Problem] To provide a relief pressure control system for a hydraulic working machine, which can realize control of a relief pressure of a variable solenoid relief valve without actuation of working equipment. [Solution] A relief pressure control system is provided with a controller (13) for outputting, responsive to an adjustment signal outputted from a dial switch (12), a control signal to control a relief pressure of a variable solenoid relief valve (10a or10b), a display unit (14) for displaying, responsive to display signals outputted from the controller (13), a relationship between a circuit pressure outputted from a pressure sensor (11) and a pressure required by a hydraulic cylinder (1), and a control device (6) constituting a start instruction unit for instructing a start of control of the variable solenoid relief valve (10a or10b). Stop valves (15a, 15b) are arranged sections of main lines (9a, 9b), which communicate a directional control valve (4) and the hydraulic cylinder (1) with each other, to open or close the section. The sections are located between positions on the main lines, where the variable solenoid relief valves (10a,10b) are connected to the main lines, respectively, and the hydraulic cylinder (1).
RELIEF PRESSURE CONTROL DEVICE FOR HYDRAULIC WORK MACHINE
[Problem] To provide a relief pressure control system for a hydraulic working machine, which can realize control of a relief pressure of a variable solenoid relief valve without actuation of working equipment. [Solution] A relief pressure control system is provided with a controller (13) for outputting, responsive to an adjustment signal outputted from a dial switch (12), a control signal to control a relief pressure of a variable solenoid relief valve (10a or10b), a display unit (14) for displaying, responsive to display signals outputted from the controller (13), a relationship between a circuit pressure outputted from a pressure sensor (11) and a pressure required by a hydraulic cylinder (1), and a control device (6) constituting a start instruction unit for instructing a start of control of the variable solenoid relief valve (10a or10b). Stop valves (15a, 15b) are arranged sections of main lines (9a, 9b), which communicate a directional control valve (4) and the hydraulic cylinder (1) with each other, to open or close the section. The sections are located between positions on the main lines, where the variable solenoid relief valves (10a,10b) are connected to the main lines, respectively, and the hydraulic cylinder (1).
RELIEF PRESSURE CONTROL DEVICE FOR HYDRAULIC WORK MACHINE
ENTLASTUNGSDRUCKSTEUERVORRICHTUNG FÜR EINE HYDRAULISCHE ARBEITSMASCHINE
DISPOSITIF DE RÉGULATION DE PRESSION DE DÉCHARGE POUR ENGIN HYDRAULIQUE DE TRAVAUX
AZUMA HIROYUKI (author) / NAKAMURA TSUYOSHI (author) / TSUKADA HIDENOBU (author) / SATO KENSUKE (author) / OKANO YASUO (author)
2019-09-11
Patent
Electronic Resource
English
Relief pressure control device for hydraulic work machine
| European Patent Office | 2016
Relief pressure switching apparatus for hydraulic working machine
| European Patent Office | 2018