Center structure of excavator drill rod

The invention relates to a center structure of an excavator drill rod. The excavator drill rod comprises n sections of main rods and a section of a core rod, wherein each section of the main rods comprises a drill rod and a driving pipe connected with each other; each section of the driving pipes is...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHAO XINYU, HU LIANQI
Format:	Patent
Sprache:	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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