DOWN-THE-HOLE-DRILL |
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| 申请号 | EP87300928 | 申请日 | 1987-02-03 | 公开(公告)号 | EP0233038A3 | 公开(公告)日 | 1988-11-23 |
| 申请人 | BOART INTERNATIONAL LIMITED; | 发明人 | PAUL, DAVID WILLIAM; WILLIAMS, DAVID STANLEY; | ||||
| 摘要 | A down-the-hole drill is hydraulically powered with air flushing. The rotation motor (16) is on the drill string (10) and rotates a percussion hammer (20) to which the drill bit is chucked. Hydraulic fluid flows in umbilicals (11) clipped into grooves on the sides of the drill rods. The shuttle valve (26) for the hammer is in line with the piston (25). | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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