Well wellhole automatic drainage controlling means is faced upward to colliery main shaft

The utility model relates to a colliery is the drainage technology field in the pit, discloses a well wellhole automatic drainage controlling means is faced upward to colliery main shaft, and it includes the body, is hollow circular cylinder shape, floats in the surface of water for survey the heigh...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	CHU TAO, WEI FENG, SHI KENAN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS MINING SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS
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