| 摘要 |
<p>A coupling device, for coupling a shaft furnace tap hole drilling rod 14 to a drilling machine for the extraction of the rod 14, includes piston operated jaws 22, 24 slidable inside a housing 12 from a position out of engagement with a drilling rod 14 to a position in gripping engagement therewith. The pistons 36, 38 for pushing the jaws 22, 24 are housed in the chambers 32, 34 of a block 10. They are driven, against their respective spring force, such as by feeding compressed air into the chambers 32, 34. The jaws 22, 24 thus slide and grip the rod 14 whereafter the entire device can be moved leftwardly (as seen in the figures) to extract the rod 14. The jaws may be in the form of slidable gripping rollers or pivotable cams. The jaws are made of a material which is harder than that of the rod 14. <IMAGE></p> |
