Permissible detonating cord for coal mine, and cord maker thereof

Abstract

The invention relates to a permissible detonating cord for a coal mine. The core of the detonating cord is mixed type explosive and comprises the following formulas in percentage by weight: 93%-97% of PETN (pentaerythritol tetranitrate) or RDX and 3%-7% of flame inhibitor A; the core is coated with a flame inhibitor B, the formula of the flame inhibitor B is as follows in percentage by weight: 60%-80% of alkaline metal halide, and 20-40% of halogenated hydrocarbon. A cord production machine for producing the detonating cord comprises a rack, a first coil and a second coil are arranged on the rack and are respectively provided with a forming die and a fibrous scaffold, and an explosive feeding device is arranged on the forming die of the second coil. The flame inhibitor is added in the core and the core is coated with the flame inhibitor, so as to omit the asphalt coating, so that the detonating cord is safe and reliable, and the hidden safety hazard of the coal mine can be eliminated; the flame inhibitor feeding device is additionally arranged on the basis of the existing detonating cord production machine, so that the mass production of the detonating cord can be realized.

Description

technical field [0001] The invention belongs to the technical field of blasting equipment, in particular to a detonating cord and a detonating cord making machine. Background technique [0002] The detonating cords allowed in existing coal mines have the problems of low safety and reliability, difficult quality control in the production process, and poor quality stability. The structure of the existing coal mine detonating cord is: the drug core is PETN or RDX, the drug core is wrapped with cotton thread, the surface of the cotton thread is coated with asphalt, the flame suppressant is adhered with pitch, and the flame suppressant is wrapped with cotton thread , and finally coat the outer surface with a plastic layer. Coal mines produced in this way allow the explosion temperature of the core to be higher after detonating cord explosion, asphalt and cotton thread are gasified or dusted under the action of high temperature and shock waves, and these substances are mixed ...

AI Technical Summary

Problems solved by technology

Coal mines produced in this way allow the explosion temperature of the core to be higher after detonating cord explosion, asphalt and cotton thread are gasified or dusted under the action of high temperature and shock waves, and these substances are mixed with coal mine methane gas under the high temperature of the core Afterwards, it is easy to be ignited, causing a gas explosion accident

In addition, the amount of flame extinguishing agent bonded by asphalt is small, the amount of adhesion is also unstable, and it is easy to shake off during the production process, which leads to poor safety and reliability of the gas safety and reliability of detonating cords allowed in coal mines, and brings hidden dangers to safe production in coal mines.

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