METHOD FOR INITIATION OF BLASTHOLE CHARGES Russian patent published in 2010 - IPC F42D1/02 

FIELD: blasting.

SUBSTANCE: invention is related to mining industry. Incendiary charges are connected to each other in direction of blasthole charges initiation with sections of igniting fuse by insertion of their ends into blasthole charges, which are ignited serially. End of the first section of igniting fuse, which connects the first and second incendiary charges along with direction of blasthole charges initiation, is ignited simultaneously with the first bundle of igniting tubes of the first incendiary charge. Igniting composition of incendiary charge, which is secondary along direction of blasthole charges initiation, is ignited as powder thread of igniting fuse first section is after-burned. By ignition of igniting fuse second section end, specified sequence of igniting fuse sections burning is repeated in direction of blasthole charges initiation, excluding the last igniting charge. Minimum length of igniting tube in each igniting charge is accepted to minimum length of igniting fuse, which is first along direction of each igniting fuse blasthole charges initiation. Difference in length of igniting tubes of each igniting charge, excluding the last one in direction of blasthole charges initiation, is accepted as equal to ratio of igniting fuse section length, which connects two igniting charges to number of igniting tubes of igniting charge, which is arranged in direction opposite to initiation of blasthole charges.

EFFECT: increased volume of mineral wealth cutting at one time of blasthole charges due to increasing of their amount and providing safety of blasthole charges initiation.

1 dwg