THERMAL-MECHANICAL DRILLING DEVICE FOR HARD MINE ROCKS Russian patent published in 2011 - IPC E21B7/15 E21C37/18 

FIELD: mining.

SUBSTANCE: thermal-mechanical drilling device for hard mine rocks includes core tube, drilling bit and plasmotron. Core tube is attached in upper part to rod cable on which current collector for supply of electric power to plasmotron and swivel for supply of compressed air to clean the bottom hole and to cool the plasmotron and drilling bit are installed. At that, lower part of core tube is connected to detachable cylindrical drilling bit, and on lower surface of core tube there installed is compressed air supply system and electric power supply system to plasmotron cavity and they are connected in lower part to cylindrical drilling bit and in upper part to rod cable.

EFFECT: higher drilling efficiency of hard mine rocks with removal of softened mine rock layer from the bottom-hole.

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