A device in core barrels |
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| 申请号 | EP81850183 | 申请日 | 1981-10-07 | 公开(公告)号 | EP0050104A3 | 公开(公告)日 | 1984-08-01 |
| 申请人 | Craelius AB; | 发明人 | Eriksson, Sune Wilhelm; | ||||
| 摘要 | A device in core drilling for indicating when a core barrel placed in a rotatable hollow drill rod is no longer capable of receiving a further quantity of reamed-out core material includes a valve which at said condition of the barrel constricts the passage for flushing medium flowing between the core barrel and the bore of the drill rod so that a readable flushing medium pressure increase occurs. The valve closes off said passge incompletely to allow a minor quantity of flushing medium to be taken to the drill bit mounted at the bottom of the drill rod, thereby to prevent said drill bit from being burnt out. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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