Coal mine underground high confined water drilling pressure reduction device

The utility model relates to the technical field of underground coal mine pressure reduction, in particular to an underground coal mine high confined water drilling pressure reduction device which comprises a plurality of pipeline bodies, one end of each pipeline body is fixedly connected with a fir...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GUO HONGQI, WANG FUJUN, SHI GENGJUN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BLASTING EARTH DRILLING ENGINEERING ELEMENTS AND UNITS FIXED CONSTRUCTIONS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MINING PIPES SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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