HYDRAULIC CONTROL UNIT FOR HYDRAULIC SHOVEL

PROBLEM TO BE SOLVED: To provide a hydraulic control unit for a construction equipment that can enhance swing operationality at a normal work, reduce the turning speed at even a hanging-load work, and fine operability, of the swing without sacrificing the operability of front actuators other than a...

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Bibliographische Detailangaben
Hauptverfasser:	KAJITA YUSUKE, KANEKO ZENJI
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 hydraulic control unit for a construction equipment that can enhance swing operationality at a normal work, reduce the turning speed at even a hanging-load work, and fine operability, of the swing without sacrificing the operability of front actuators other than a turning motor. SOLUTION: This hydraulic control unit comprises a first hydraulic pump 2, a second hydraulic pump 3, a third hydraulic pump 4, a boom actuator, an arm actuator, a bucket actuator, a traveling actuator, and a turning motor 51. The first pump 2 and the second pump 3 driven each actuator of the boom, the arm, the bucket, and traveling. The third pump drives the turning motor 51. Furthermore, the volume variable function in the third pump sets a regulator 31 that is operated by a selecting switch 32 and a control device 33. Accordingly, the maximum discharge flow of the third pump 4 can be varied, in response to the selection of the selection switch 32.