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    • 6. 发明授权
    • Front loading hydraulic excavator
    • 前装液压挖掘机
    • US4354797A
    • 1982-10-19
    • US154278
    • 1980-05-29
    • Kiyonobu HiroseTaizo Izumiyama
    • Kiyonobu HiroseTaizo Izumiyama
    • E02F3/43E02F3/86
    • E02F3/437
    • An excavator including a boom pivotally moved by boom cylinders, an arm pivotally moved by an arm cylinder and a bucket pivotally moved by bucket cylinders further includes a boom detecting device detecting a pivotal displacement of the boom and producing a first pilot pressure substantially proportional to the pivotal displacement of the boom and a bucket detecting device detecting a pivotal displacement of the bucket and producing a second pilot pressure substantially proportional to the pivotal displacement of the bucket. The first pilot pressure is supplied via a first conduit to a first valve switching pilot pressure port of a control valve device, and the second pilot pressure is supplied via a second conduit to a second valve switching pilot pressure port of the control valve device. The control valve device is connected to the bucket cylinders in such a manner that a piston side of the bucket cylinders can be drained.
    • 一种挖掘机,其特征在于,包括由动臂油缸枢转地移动的动臂,由斗杆缸枢转运动的臂和由斗式液压缸枢轴运动的铲斗,还包括检测动臂的枢转位移并产生与第一先导压力成正比的第一先导压力的动臂检测装置 悬臂的枢转位移和铲斗检测装置,其检测铲斗的枢转位移并产生与铲斗的枢转位移基本成比例的第二先导压力。 第一先导压力通过第一管道供应到控制阀装置的第一阀开关先导压力端口,并且第二先导压力经由第二管道供应到控制阀装置的第二阀切换先导压力端口。 控制阀装置以能够排出铲斗油缸的活塞侧的方式与铲斗油缸连接。