Uncoupled charging device and method for preventing excessive crushing of ore and spontaneous combustion of sulfide ore

Abstract

The invention discloses a decoupling charge device and method capable of preventing excessive crushing of ores and spontaneous combustion of sulphide ores. The decoupling charge device comprises a blast hole baffle, a cylindrical charge tube made of a flexible material and a gravity hammer mesh bag fixed at the lower end surface of the bottom of the charge tube; and a plurality of groups of protruding supporting points are annularly distributed on the outer wall of the charge tube from top to bottom. Compared with the prior art, the device and the method are characterized in that decoupling charge is adopted for blast hole blasting, detonation waves transmit detonation into hole wall rock through an air medium, and air gaps, just like an air cushion, can store the energy of a gas product at the initial stage of the detonation waves (partially), so that the peak value of the initial pressure acting on a blast hole is weakened; and then the compressed air cushion releases the large amount of stored energy for acting, so that the acting time of the detonation gas product is prolonged, the blasting effect is improved, and the ores are prevented from being excessively crushed; and an spontaneous-detonation-proof effect can also be achieved, and then the spontaneous combustion of the sulphide ores under high-temperature explosives can be prevented.

Description

technical field [0001] The invention relates to the field of charge methods and devices in blasthole blasting engineering, in particular to an uncoupled charge device and method for preventing excessive crushing of ore and spontaneous combustion of sulfide ore. Background technique [0002] The use of uncoupled charge can reduce the amount of blasting charge. When the detonation charge explodes, the detonation wave is transmitted to the hole wall rock through the air medium, and the air gap is like an air cushion, which can store the energy (part) of the gas product in the initial stage of the detonation wave, weakening the impact on the blast hole. initial peak pressure. Then the pressurized air cushion releases a large amount of stored energy to do work, which prolongs the action time of the detonation gas products and improves the blasting effect. In addition, in the production of blasting engineering, due to the high temperature of mixed emulsified explosives on site, ...

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Problems solved by technology

[0003] However, in the current uncoupled charge blasting project, there are the following problems: ① In actual blasting engineering, it is difficult to ensure that the explosive is located in the center of the blast hole when carrying out uncoupled charge; ② Some uncoupled charge devices are complicated to disassemble, The construction is difficult and the efficiency is low; ③The problem of not coupling the materials of the charging device components leads to more static electricity, and premature explosion accidents are prone to occur

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