发明名称 |
APPARATUS FOR PREVENTING DROP OF WORK EQUIPMENT OF CONSTRUCTION MACHINERY |
摘要 |
Disclosed is an apparatus for preventing the drop of a work equipment of construction machinery for adjusting a descending speed of the work equipment when leakage occurs in a return line while the work equipment is descending. Provided is an apparatus for preventing the drop of the work equipment of construction machinery according to the present invention, comprising a hydraulic cylinder which is driven by hydraulic oil of a hydraulic pump; a control valve which is installed in a flow path between the hydraulic pump and the hydraulic cylinder; an operating lever; a drop prevention valve which is installed in a flow path between the control valve and the large chamber of the hydraulic cylinder; a return pressure first detection sensor which is installed in a flow path between the control valve and the drop prevention valve; and a controller for adjusting an opening area of the drop prevention valve when leakage occurs in the return line which returns the hydraulic oil from the hydraulic cylinder by a detection signal from the return pressure first detection sensor when the hydraulic cylinder is contracted and operated. |
申请公布号 |
WO2017022868(A1) |
申请公布日期 |
2017.02.09 |
申请号 |
WO2015KR08054 |
申请日期 |
2015.07.31 |
申请人 |
VOLVO CONSTRUCTION EQUIPMENT AB;JEE, Se-Rib |
发明人 |
JEE, Se-Rib |
分类号 |
E02F9/24;E02F3/16;E02F9/22 |
主分类号 |
E02F9/24 |
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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