公开(公告)号：EP1375759A1

公开(公告)日：2004-01-02

申请号：EP01273679.9

申请日：2001-12-14

申请人： Shin Caterpillar Mitsubishi Ltd.

发明人： YOSHINO, T. c/o Shin Caterpillar Mitsubishi Ltd. ,  SHIMADA, Y. c/o Shin Caterpillar Mitsubishi Ltd.

IPC分类号： E02F9/22 ,  F15B11/02 ,  F15B11/024

CPC分类号： F15B11/024 ,  E02F9/2203 ,  E02F9/2228 ,  E02F9/2282 ,  F15B2211/30525 ,  F15B2211/3058 ,  F15B2211/3116 ,  F15B2211/31576 ,  F15B2211/329 ,  F15B2211/6313 ,  F15B2211/6316 ,  F15B2211/6346 ,  F15B2211/6355 ,  F15B2211/6654 ,  F15B2211/78

摘要： The invention relates to a hydraulic control circuit of a boom cylinder for a work machine, which, when controlling supply and discharge of pressurized oil with respect to a boom cylinder, improves fuel efficiency, work efficiency in combined operations, and improves work efficiency and operationality in work of difficult boom operations such as debris raking-up work and bumping work, etc., wherein the hydraulic control circuit of a boom cylinder 8 is provided with a first change valve 19 for holding the boom control valve 13 in the neutral position N, a communication line E for causing the head side oil chamber 8a and the rod side oil chamber 8b to communicate with each other, an opening and closing valve 18 for opening and closing the communication line, and a pilot operating check valve 20 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 oil flows in both directions.

摘要翻译： 本发明涉及一种用于作业机械的动臂缸的液压控制回路，其在控制压力油相对于动臂缸的供给和排出时，提高了燃油效率，组合操作中的工作效率，并提高了工作效率和操作性 在诸如碎屑耙作业和碰撞作业等困难的斗杆操作的工作中，其中动臂缸8的液压控制回路设置有用于将动臂控制阀13保持在中立位置N的第一换向阀19 用于使头侧油室8a和杆侧油室8b相互连通的通信线E，用于打开和关闭通信线路的打开和关闭阀18以及改变的先导操作止回阀20 到单向状态，其中虽然允许从头侧油室到杆侧油室的油流动，但是逆流被阻碍，并且双向sta 石油在双向流动时允许使用。