A shaped charge tube for blasting and pressure relief in coal mine composite roof retaining roadways.

Abstract

This application discloses a shaped charge tube for blasting and depressurizing in coal mine composite roof retaining roadways, relating to the field of coal mine blasting technology. It can reduce the transfer of blasting energy to the retained roadway roof and ensure a weakening effect on the goaf roof. The shaped charge tube includes: a tube body and an arc plate; the tube body is an integral structure with an inner cavity, both ends of the tube body are through-holes, and a slit is formed on the outer wall of the tube body along a predetermined direction, extending from the outer wall to the inner wall of the tube body, and communicating with the inner cavity of the tube body; the arc plate is disposed on the outer wall of one side of the tube body, extending along the axial direction of the tube body, and the inner wall of the arc plate is adapted to and fits against the outer wall of the tube body, wherein the slit is located outside the area where the inner wall of the arc plate fits against the outer wall of the tube body. This application is applicable to blasting scenarios of composite roofs in coal mines.

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