Deep hole pre-splitting directional blasting energy gathering pipe device of coal mine roof

The invention discloses a deep hole pre-splitting directional blasting energy gathering pipe device of a coal mine roof. The deep hole pre-splitting directional blasting energy gathering pipe device comprises energy gathering pipes, an energy gathering pipe connecting device, an energy gathering pip...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHANG GUOQIANG, CHEN JIANPENG, LI XUEFENG, LI MIHE, DING NAN, LI ZHUHE
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AMMUNITION BLASTING EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION HEATING LIGHTING MECHANICAL ENGINEERING WEAPONS
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