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    • 21. 发明授权
    • Hydraulic control circuit of boom cylinder in work machine
    • 工作机械臂液压缸液压控制回路
    • US06820355B2
    • 2004-11-23
    • US10276795
    • 2002-11-19
    • Tetsuya YoshinoYoshiyuki Shimada
    • Tetsuya YoshinoYoshiyuki Shimada
    • G05D102
    • F15B11/024E02F9/2203E02F9/2228E02F9/2282F15B2211/30525F15B2211/3058F15B2211/3116F15B2211/31576F15B2211/329F15B2211/6313F15B2211/6316F15B2211/6346F15B2211/6355F15B2211/6654F15B2211/78
    • A hydraulic control circuit of a boom cylinder for a work machine, which, when controlling the supply and discharge of pressurized oil with respect to a boom cylinder, improves fuel efficiency, work efficiency in combined operations, and work efficiency and operationality in work of difficult boom operations, such as debris raking-up work and bumping work, etc. The hydraulic control circuit of a boom cylinder is provided with a first change valve for holding the boom control valve in the neutral position, a communication line for causing the head side oil chamber and the rod side oil chamber to communicate with each other, an opening and closing valve for opening and closing the communication line, and a pilot operation check valve that is changed to an unidirectional state where, although an oil flow from the head side oil chamber to the rod side oil chamber is permitted, a reverse flow is hindered, and a bi-directional state is permitted where the oil flows in both directions.
    • 一种用于作业机械的动臂缸的液压控制回路,其在控制加压油相对于动臂缸的供给和排出时,提高了燃料效率,组合操作中的工作效率以及难于在工作中的工作效率和操作性 起重臂操作,如碎片耙动和碰撞作业等。动臂液压缸的液压控制回路设置有用于将悬臂控制阀保持在中立位置的第一换向阀,用于使头侧 油室和杆侧油室彼此连通,用于打开和关闭通信线路的打开和关闭阀;以及先导操作止回阀,其被改变为单向状态,其中,尽管来自头侧的油流 允许油室到杆侧油室,反向流动受到阻碍,并且允许油在两个方向上流动的双向状态。