Drill rod with height convenient to adjust for coal mining

The invention relates to the field of drill rods, in particular to a drill rod convenient for height adjustment for coal mining. According to the drill rod convenient to adjust the height for coal mining, the drilling depth can be increased, and the stability is good. A drill rod convenient to adjus...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHANG CHENG, WANG GUIXIANG, SU LITANG, MI JUNYI, HAN XIN, QI ZHENLU, ZHOU HENG, LI MINGZHONG, SUN JIANSHU, GU WEIWEI, TIAN JIAGENG, CANG KAI, WANG DONG, ZHAO MEI, TIAN SHENGLI, LI ZHAOCAI, WU LINLIN, YAO SHANXU
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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