HYDRAULIC CONTROL APPARATUS

PROBLEM TO BE SOLVED: To effectively and simultaneously drive a plurality of actuators in a hydraulic control apparatus which comprises a pump driven by an engine capable of multiplying the number of engine revolutions, and a plurality of hydraulic control valves driving and controlling a plurality...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TADA MASAMITSU, HIRAMI KAZUHIKO, SASAKI HIDEYUKI, KUSANAGI HIROSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CRANES DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS HAULING HEATING HOISTING HYDRAULICS OR PNEUMATICS IN GENERAL LIFTING LIGHTING LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES MECHANICAL ENGINEERING PERFORMING OPERATIONS SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To effectively and simultaneously drive a plurality of actuators in a hydraulic control apparatus which comprises a pump driven by an engine capable of multiplying the number of engine revolutions, and a plurality of hydraulic control valves driving and controlling a plurality of actuators. SOLUTION: An engine revolution detecting means 20 detecting the number of revolutions of the engine 10 is arranged, and respective hydraulic control valves 12, 13, and 14 are switched and controlled in proportion to an operating signal sent from respective operating means 15, 16, and 17 when the number N of engine revolutions is equal to or less than the maximum number of revolutions. The engine 10 is multiplied and controlled so that a discharged oil amount Qp of the pump becomes equal to the sum of required oil Q1+Q2+Q3, and respective hydraulic control valves 12, 13, and 14 are switched and controlled by valve switching amounts K.V1, K.V2, and K.V3 which are reduced at a rate K of the discharging oil amount Qp of the pump and the sum of required oil Q1+Q2+Q3 when the number N of engine revolutions is equal to the maximum number of revolutions.