| 摘要 |
FIELD: mining industry, applicable at breaking of valuable ores in open pits and development of hard rocks in hindered conditions. ^ SUBSTANCE: the method consists in drilling of horizontal blast holes, charging of them, tamping, blasting in a loose clamp under a clamping device by layers parallel with the bench bottom with outlining of the clamped rock space before blasting by the methods of slit-forming at a preset slope of the outlined holes. First the hole charges in the lowest layer of rocks adjusting the bench bottom are blasted, then at least in 110 ms the hole charges in the rest layers are successively blasted from top to bottom. The device for blast localization includes a vehicle in the form of a carriage with a bearing platform carrying a dust collector and an absorber, lattice vertical frame with enclosing members coupled to the bearing platform for motion and inclination, lattice horizontal frame with freely suspended enclosing members coupled to the boom installed on the bearing platform by ropes and provided with an elastic housing with a sealing apron in outline forming a closed space above it. In addition an assembly platform is installed for assembly of the member of the lattice horizontal frame, the boom is made telescopic for extension in the horizontal direction of the movable section provided with a support, and the enclosing members of the lattice vertical and horizontal frames are of worm-out automobile tires. ^ EFFECT: enhanced efficiency of blast crushing of rocks due to the complete use of the blast energy reflected from the free surfaces of the bench. ^ 2 cl, 2 dwg |
