Drill bit device is unloaded to quick twisting

The utility model discloses a drill bit device is unloaded to quick twisting, including open the front that has first trompil twist unload the board with lie in respectively openly wrong unload the board homonymy on mounting plate, the bottom plate of lower extreme, the mounting plate sets up perpen...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	WEI TAO, SHI DEZHOU, ZHOU WEIDONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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