发明名称 |
Hydraulic control device of an excavator with improved loading performance on a slope |
摘要 |
A hydraulic control device of an excavator is provided for controlling combined operation of boom-raising and swing on a slope. A swing priority valve (20) is provided on a pressured fluid supply line (8) that connects a first hydraulic pump (1) to a boom high-speed control valve (7). If an excavator performs its tasks on a slope, the swing priority valve (20) is automatically shifted under a control of an electronic controller (28) into a throttling position to thereby restrict hydraulic flow through the boom high-speed control valve (7) so that an increased amount of hydraulic flow can be supplied to a swing motor (14), thus increasing a swing operating pressure more rapidly than a boom operating pressure and consequently facilitating combined operation of boom-raising and swing on a slope. |
申请公布号 |
EP1672128(B1) |
申请公布日期 |
2016.09.14 |
申请号 |
EP20050292641 |
申请日期 |
2005.12.12 |
申请人 |
DOOSAN INFRACORE CO., LTD. |
发明人 |
KIM, HYEONG HO;SOHN, WON SUN |
分类号 |
E02F9/22;E02F9/12 |
主分类号 |
E02F9/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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