| 摘要 |
FIELD: rock breaking, designed to enhance the efficiency of the process of blasting of sprung-hole charges. SUBSTANCE: rock-breaking charge contains an explosive, metal plates, firing pin and a detonating cord. Metal plates are made in the form of parallel-twinned and diametrically arranged plates with collinear direction of band- helical surfaces rigidly connected in the upper and lower parts by means of U-shaped segments. The distance between surfaces equals the product of the width of one surface by the multiplicity of ratios of the diameters of sprung-hole cavity and upper non-expanded part of the hole. The twinned band-helical plates are positioned in end parts of the firing pin. EFFECT: enhanced efficiency. 2 cl, 2 dwg
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