METHOD FOR DISLODGING ROCK Russian patent published in 2008 - IPC F42D3/04 

FIELD: mining.

SUBSTANCE: method for dislodging rock involves application of rock dislodging charges containing explosives 4; twisted metal plates in the form of ribbon screw surfaces 2 parallel coupled and diametrically opposite in collinear direction and rigidly fixed at upper and lower parts by U-shape segments, with the distance between screw surfaces equal to product of one surface width and repetition factor of chamber and upper non-expanded part diametres ratio; primer 1, and detonation cord 3. Twisted metal plates are placed inside the upper part of explosive at the lower primer 1 end, and blasthole charge pattern in the block to be blasted includes positioning charge clusters in adjoining wells alternating metal plates screwed clockwise and counter-clockwise.

EFFECT: increased efficiency of sprung blasthole charge explosion.

4 dwg