Novel coal permissible detonating cord

Abstract

The invention discloses a novel coal permissible detonating cord of which a flux core is prepared from 3-10 percent by weight of halogenated straight-chain paraffin or halogenated naphthenic hydrocarbon with the particle size being smaller than 40-100 meshes and 90-97 percent by weight of high-energy propellant by uniformly mixing; a tube flame inhibitor comprises 50-70 percent by weight of NaCl, 30-50 percent by weight of ABC dry powder or 30-50 percent by weight of KH2O4 which are all particles with the particle size of 25-150 meshes and uniformly mixed, or the tube flame inhibitor adopts 100 percent by weight of NH4Cl with the particle size being 25-150 meshes; the tube flame inhibitor is in a concentric structure, i.e. an externally coated flame inhibitor layer (1) and the flux core (2) are concentrically coated, and the dose of the coated flame inhibitor is 11.0-14.0g/m; and the coating material adopts cotton fibre or PET filament strands or a PET film (3). The invention has the advantages of simple structure, stable and reliable product quality, suitability for collinear production with common detonating cords and bulk production, convenience for improving production facility and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of product formula and product structure of cable-like civilian blasting equipment that is allowed to detonate in coal mines. Background technique [0002] The existing coal mine detonating cord usually adopts two kinds of structures, one is that the core is pure high-energy explosive, and a layer of asphalt is coated outside the inner line, and the flame suppressant is adhered to the asphalt, and then the Chinese and foreign The layer lines are fixed, and finally the surface is coated with a plastic layer. Another kind is that the drug core is still a pure high-energy explosive, wrapped on a layer of flame suppressant outside the inner layer wire, then fixed with the middle and outer layer wires, and finally coated with a plastic layer on the surface. The production process of the product with the first structure is simple, but the way the flame extinguishing agent adheres to the asphalt is very unstable, ...

AI Technical Summary

Problems solved by technology

The production process of the product with the first structure is simple, but the way the flame extinguishing agent adheres to the asphalt is very unstable, and the adhesion amount of the flame extinguishing agent fluctuates. It is better if the flame extinguishing agent is granular, and if it is powder , the sufficient amount and coating uniformity cannot be guaranteed, which is crucial to the gas safety of detonating cords allowed in coal mines

At the same time, when the detonating cord detonates, the explosion temperature of the drug core is higher, which increases the risk of detonating combustible gas

Poor safety and reliability of product quality

The production process of the product with the second structure is also simple, and the amount of charge of the flame suppressant is also large enough. However, when the detonating cord is detonated, the explosion temperature of the drug core is relatively high. If the control is not good, the high-temperature reaction product of the drug core will leak out, and the risk of igniting combustible gas will increase

Product quality has poor reliability of combustible gas safety, which is fatal to coal mine permit detonating cord

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