CRUSHING CARTRIDGE WITH POWDER CHARGE FOR ROCKS Russian patent published in 2013 - IPC F42B3/26 F42B3/02 

FIELD: blasting.

SUBSTANCE: crushing cartridge (1) with a powder charge for rocks comprises a cylindrical case (2) with an end wall at the end (3), a plug (4), which is inserted into the opposite end of the outer case and is fixed in it, closing the case, the main chamber (5), arranged in the outer case (2) between the end wall and the plug and filled with a rupture powder charge (6), a cylindrical inner case (7) coaxial with the outer case (2) connected with a plug and stretching in the rupture powder charge in the main chamber, and a central through hole (8) in the plug, which communicates with the inner case, closed at its inner end, which is inserted into the rupture powder charge. The hole in the plug and the inner case together form an ignition chamber (9), the shape of which corresponds to the outer shape of a detonator (10), which is actuated electrically and contains an igniting charge of an explosive. The inner case has an inner plastic wall (13). The thickness of the plastic wall and plastic are selected so that under action of pressure and frame occurring whenever the detonator ignites, the plastic wall is pierced for less than 25 ms, as a result the rupture powder charge is ignited.

EFFECT: higher safety in operation of an explosive cartridge.

13 cl, 3 dwg