Hydraulic excavating mobile machine

Abstract

A hydraulic excavating mobile machine comprises a working implement at least two parts of which is operated by respective hydraulic actuators (hydraulic cylinders 2 and 3 ), pressure control valves 6 and 7 provided in pressurized fluid supply lines 4 and 5 to the actuators and connected to operating levers 11 and 12 , respectively, pressure compensating valves 10 and 10 a provided between the pressure control valve 6 and the one hydraulic actuator (the hydraulic cylinder 2 ) and between the pressure control valve 7 and the other actuator (the hydraulic cylinder 3 ), respectively, an operation mode selecting unit (a monitor 18 ) provided in a cab of the mobile machine, a controller 14 providing a control signal, and a variable pressure compensating value function storing unit provided in the controller 14 . The pressure compensating valves 10 and 10 a are operated by the control signal from the controller 14 according to an operation mode selected by the operation mode selecting unit to thereby control an amount of a pressurized fluid supplied to each of the actuators. Thus, an operator selecting an operation mode at hand can carry out a desired operation with a combined operation of a plurality of actuators controlled without being required to have any skill.

What is claimed is:  
     
         1 . A hydraulic excavating mobile machine comprising: 
 a working implement at least two parts of which is operated by respective hydraulic actuators;    a directional control valve provided in each pressurized fluid supply line to each of the actuators;    a pressure compensating valve provided in each pressurized fluid supply line to each of the actuators;    means for selecting an operation mode, the means being provided in a cab of the mobile machine;    a controller providing a control signal; and    means for storing a variable pressure compensating value function, the means being provided in the controller,    the pressure compensating valves being operated by the control signal from the controller having the variable pressure compensating value function storing means according to an operation mode selected by the operation mode selecting means to thereby control an amount of a pressurized fluid supplied to each of the actuators.    
     
     
         2 . The hydraulic excavating mobile machine as claimed in  claim 1  wherein the means for storing a variable pressure compensating value function is provided as means for storing a strong compensating function.  
     
     
         3 . The hydraulic excavating mobile machine as claimed in  claim 1  wherein the means for storing a variable pressure compensating value function is provided as means for storing a weak compensating function.  
     
     
         4 . The hydraulic excavating mobile machine as claimed in  claim 1  wherein the means for selecting an operation mode is provided with an operation mode selecting switch and a variable level adjusting switch to allow a degree of pressure compensation in the pressure compensating valve by the variable pressure compensating value storing means to be variable.  
     
     
         5 . A hydraulic excavating mobile machine comprising: 
 a working implement at least two parts of which is operated by respective hydraulic actuators;    a directional control valve provided in each pressurized fluid supply line to each of the actuators;    a pressure compensating valve provided in each pressurized fluid supply line to each of the actuators;    a monitor installed in a cab of the mobile machine;    means for selecting an operation mode, the means being provided in the monitor;    a resistor; and    a solenoid valve,    an electric signal from the operation mode selecting means being inputted to each of the pressure compensating valve through the resistor and the solenoid valve to operate the pressure compensating valve to thereby control an amount of a pressurized fluid supplied to each of the actuators.