| 摘要 |
FIELD: production of means of initiation, applicable in blasting operations for a short-delayed blasting of explosive charges, in mines and pits dangerous in gas and duct inclusive. ^ SUBSTANCE: constantan with a diameter of 40 mum at a ratio of the resistance bridge length to its diameter 1/d1=25-50 is used as a resistance bridge in the electrical detonator, the interval between the series of delay of the electric detonator determined as (Hn+1-Hn)/U=30-50, where Hn+1 - the subsequent series of delay of the electric detonator, Hn - the previous series of delay, U - the rate of burning within 4 to 320 ms, the ratio of the length of the layer (Delta) of the flash absorber covering the outer surface of the case to the case diameter (d2) should be Delta/d2=0,01-0,042, and the ratio of the height of lead azide to its diameter H/d3 should be at least 0.09. Trisodium phosphate hydrate or polyvinyl chloride chlorinated resin applied to the case outer surface is used as the flash-absorbing compound coating the case outer surface. Delaying compounds. Compound No.1, formulation, per cent by mass: ferrosilicochrome (FSC)-50-52; minium - 50-48, binder (0.4-2.5 per cent) - above 100 per cent, at a specific surface of FSC (Ssp) - 2200-3500 sq/g. Compound No.2, not containing lead compounds, formulation, per cent by mass: ferrosilicochrome - 55-65; barium peroxide processed by abietic resin - 35-45; binder (0.4-2.5 per cent) above 100 per cent. ^ EFFECT: enhanced efficiency and safety of blasting operations in mines and pits dangerous in gas and duct, provided reliable operation in the group of native blasting machines. ^ 5 cl, 4 tbl |
