Patent ID: 6119967
Filing Date: 2000-09-19
Classification: B02C,E02F

Abstract:
A control circuit for a transportable crusher having a plurality of hydraulic units for a plurality of operating devices having different loads during a crushing operation, wherein each hydraulic unit is selected from the group consisting of hydraulic motors and hydraulic actuators, said control circuit comprising:at least one variable displacement hydraulic pump, for supplying a single discharge flow of hydraulic fluid;a plurality of switch valves, each of said plurality of switch valves being for conducting and interrupting flow of hydraulic fluid from said at least one variable displacement hydraulic pump to a respective one of said hydraulic units;a plurality of pressure compensation control valves, each of said plurality of pressure compensation control valves inputting a front pressure and a back pressure of a respective one of said switch valves for controlling a discharge flow rate of said single discharge flow from said at least one variable displacement hydraulic pump so that a difference between a respective front pressure and a corresponding back pressure can become constant; anda controller for controlling each of said switch valves to a predetermined value set in accordance with a load of said hydraulic units and for controlling said switch valves, when at least some of said switch valves are simultaneously operated and at least one of said hydraulic units is overloaded, to distribute said discharge flow rate among said switch valves in accordance with a predetermined priority.