Telescopic tensioning mechanism, telescopic tensioning method and inner and outer nested mast

The invention discloses a telescopic tensioning mechanism, a telescopic tensioning method and an inner and outer nested mast, the telescopic tensioning mechanism comprises a movable pulley block which is connected to an inner mast in a sliding mode in the axial direction of the inner mast and a fixe...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	WEI YAKUN, WANG HAIJIN, ZHAO WEI, ZHANG JIGUANG
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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