SAFETY DEVICE OF HYDRAULIC WORKING MACHINE

PROBLEM TO BE SOLVED: To provide a safety device which can drive a hydraulic actuator even when an electric lever is abnormal in manipulate signal. SOLUTION: The safety device, which comprises control valves 22-24 controlling a stream of pressure oil to hydraulic actuators 15-17 from a hydraulic sou...

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Bibliographische Detailangaben
Hauptverfasser:	SATAKE HIDETOSHI, NAGASHIMA YUJI, ICHIMURA KAZUHIRO, ODAKA KATSUAKI, GOTO YUUKI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DREDGING FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS HEATING HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL LIGHTING MECHANICAL ENGINEERING SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a safety device which can drive a hydraulic actuator even when an electric lever is abnormal in manipulate signal. SOLUTION: The safety device, which comprises control valves 22-24 controlling a stream of pressure oil to hydraulic actuators 15-17 from a hydraulic source 21, electric lever devices 51-53 outputting electric manipulate signal being drive commands of the hydraulic actuators 15-17 depending on lever operation, control means 25-30 and 50 for controlling the control valves 22-24 depending on the manipulate signal, and a judging means 50c for judging whether the manipulate signal locates within normal range or not, is characterized in that when the manipulate signal is judged not to be within the normal range by the judging means, drives of the hydraulic actuators 15-17 are permitted while suppressing the stream of pressure oil to the hydraulic actuators 15-17 less than when judged to be within the normal range. COPYRIGHT: (C)2008,JPO&INPIT