Rotary excavating child-mother drill bit, method and rotary excavating device

The rotary excavating child-mother drill bit comprises an outer barrel and an inner barrel which are coaxially arranged, the bottom end of the inner barrel extends to the position below the bottom end of the outer barrel, a plurality of cutting teeth are arranged on the edges of the bottom ends of t...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	WENG ZHENHUA, WANG HONGXU, WEN MINCHEN, TIAN ZHAODUO, CAO DIANBIN, YANG ZILONG, LIU YIN, WU SHENGZHI, TANG HAI
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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