| 摘要 |
PURPOSE: A hydraulic system for controlling the option attachment of an excavator is provided to save cost by the reducing of the number of hydraulic parts since the operation of an option attachment including a hammer is controlled by an electric control technique using an electric pedal. CONSTITUTION: A hydraulic system for controlling the option attachment of an excavator comprises a main hydraulic pump(P), a pilot pump(Pp), and an option attachment(2). The hydraulic system further comprises a selection switch(13), a direction switching valve(3), and a controller(9). The hydraulic system further comprises a proportional reducing valve(4), and a solenoid valve(12). The option attachment is driven in one or two directions. The selection switch selects the one or two directional driving of the option attachment. The direction switching valve is switched by a secondary signal input, which is input according to the selection of the selection switch. The direction switching valve controls the option attachment in one or two directions. |
