发明名称 |
BOOM CYLINDER CONTROL CIRCUIT FOR CONSTRUCTION MACHINE |
摘要 |
The present disclosure relates to a boom cylinder control circuit for a construction machine, and includes: a boom cylinder which has an ascending-side chamber and a descending-side chamber; a boom control unit which provides a working fluid to the boom cylinder; a boom operation part which is operated to drive the boom cylinder by providing a pilot working fluid to the boom control unit; a first floating valve which allows the descending-side chamber and the ascending-side chamber to selectively communicate with or be shut off from a first drain line; a second floating valve which is additionally provided in a flow path between the descending-side chamber, which is connected with the first drain line via the first floating valve, and the first drain line, allows the descending-side chamber to communicate with the first drain line, or shut off discharge of the working fluid from the descending-side chamber to the first drain line, and allows of a reverse flow; and a floating selection operation part which provides an operation signal so that the first floating valve and the second floating valve are switched in a direction in which the first floating valve and the second floating valve are communicated or shut off. |
申请公布号 |
US2014360174(A1) |
申请公布日期 |
2014.12.11 |
申请号 |
US201214369535 |
申请日期 |
2012.12.18 |
申请人 |
DOOSAN INFRACORE CO., LTD. |
发明人 |
Sohn Won Sun |
分类号 |
F15B13/04;E02F9/22;F15B13/042 |
主分类号 |
F15B13/04 |
代理机构 |
|
代理人 |
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主权项 |
1. A boom cylinder control circuit for use with a construction machine, comprising:
a boom cylinder which has an ascending-side chamber and a descending-side chamber; a boom control unit which provides a working fluid to the boom cylinder; a boom operation part which is operated to drive the boom cylinder by providing a pilot working fluid to the boom control unit; a first floating valve which allows the descending-side chamber and the ascending-side chamber to selectively communicate with or be shut off from a first drain line; a second floating valve which is additionally provided in a flow path between the descending-side chamber, which is connected with the first drain line via the first floating valve, and the first drain line, allows the descending-side chamber to communicate with the first drain line, or shut off discharge of the working fluid from the descending-side chamber to the first drain line, and allows of a reverse flow; and a floating selection operation part which provides an operation signal so that the first floating valve and the second floating valve are switched in a direction in which the first floating valve and the second floating valve are communicated or shut off. |
地址 |
Incheon KR |