Coal drill stem of small diameter and big pitch
The utility model relates to a coal drill stem of small diameter and big pitch, belonging to the technical field of coal mine tunnelling retaining. The drill stem comprises a drill stem body, threads are arranged on the drill stem body, the thread cross section is rectangular, the thread pitch is 65...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The utility model relates to a coal drill stem of small diameter and big pitch, belonging to the technical field of coal mine tunnelling retaining. The drill stem comprises a drill stem body, threads are arranged on the drill stem body, the thread cross section is rectangular, the thread pitch is 65mm, and the diameter of the drill stem body is 30mm. The utility model has the advantages of quick drilling, quick coal discharging, labour saving, time saving, anchoring agent saving and large anchoring force. |
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