HYDRAULIC DRIVER FOR CIVIL CONSTRUCTION MACHINE

摘要

PURPOSE:To realize the two composite actions of a boom and an arm without any influence to each other by a method in which an operation command signal is sent out from a commander to a controller and also to a driver to throttle the opening of a direction switch valve for bilateral traveling. CONSTITUTION:An operation command signal X1 related to the first and second boom cylinders 50 and 51 is sent out from a commander 110 to a controller 200, and a signal X2 related to left and right-side traveling motors 56 and 58 is also sent out to the controller 200. A target action command signal Y2 is multiplied and an action command signal Y2' is sent out to the driver of a direction switch valve 38 for right-side traveling and a direction switch valve 32 for left-side traveling. The opening of the valves 32 and 38 is throttled to raise the discharge pressure of oil-pressure pumps 4 and 6. The composite operation of the traveling motors and the other actuators can thus be realized by providing a lesser number of direction switching valves.