发明名称 |
PNEUMATIC DOWN-THE-HOLE DRILL |
摘要 |
A pneumatic down-the-hole (DTH) drill having a frame, and a pneumatic percussion piston that moves in a reciprocating manner as pressurized air is fed into the DTH-drill and strikes a tool in the front end of the frame is mounted movably in the longitudinal direction of the frame. A feed channel for feeding compressed air to the DTH-drill shoulders in the frame and in the percussion piston for controlling compressed air to provide an impact movement. In the rear end of the frame the DTH drill has a combustion chamber and an acceleration piston that is arranged to push the percussion piston during the impact movement for a portion of the percussion piston travel, and means for feeding combustion air and fuel into the combustion chamber, whereby the percussion piston is arranged to push the acceleration piston after the impact into the combustion chamber and to compress the air in the combustion chamber prior to feeding the fuel into the combustion chamber. |
申请公布号 |
EP2751368(A4) |
申请公布日期 |
2016.06.29 |
申请号 |
EP20120838275 |
申请日期 |
2012.10.04 |
申请人 |
SANDVIK MINING AND CONSTRUCTION OY;SANDVIK MINING AND CONSTRUCTION RSA (PTY) LTD |
发明人 |
LEPPÄNEN, JARMO;KESKINIVA, MARKKU;HEDLUND, JUHA |
分类号 |
E21B4/06 |
主分类号 |
E21B4/06 |
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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