Bare blasting is prohibited
Article 328 "Coal Mine Safety Regulations" provides that: non-exposed blasting. Exposed blasting is the blasting of explosives on the surface of the blasted coal rock without the use of blasting. In the underground working face, workers often put the medicinal soft cannon on the large rocks and large pieces of coal (the cannon), and the guns are broken. This is very dangerous.
From a safety point of view, a blast of explosives produces a flame. With a cannon (cannon) blasting on the surface of coal and rock, the explosion flame is directly exposed to the underground air. Therefore, the paste cannon (the cannon) is equivalent to arson in the underground, which is the most likely to cause gas and coal dust explosion. In mines with gas and coal dust explosion hazards, it is even more strictly prohibited to use paste cannons (open cannons).
From the perspective of blasting effect, explosives quickly release a large amount of high temperature and high pressure gas when they explode. If they explode in the blasthole, all the energy generated will act on the rock mass or coal body. If a cannon (cannon) is used, the expansion work of the explosive is not utilized, and a large amount of energy is consumed in space, which can only cause local crushing of the explosive, not only the blasting effect is poor, but also the explosive is wasted.
In addition, the blasting direction and explosive energy of the cannon (cannon) are not controlled, and it is easy to collapse and collapse the working surface bracket, causing a roof accident; in addition, it is easy to collapse the mechanical and electrical equipment of the working surface, causing other ACCIDENT. The cannon (cannon) has a large vibration in the air, and it is easy to shock the dust on the roadway support and the coal gang, increasing the content of coal dust and rock dust in the mine air, which is not conducive to industrial hygiene. Therefore, the paste cannon is a blasting method that is neither safe nor economical, and must be strictly prohibited.
The coal and vermiculite that are stuck in the coal-burning eyes can be treated with guns if there is no other way to deal with them. However, the rigid coal-fired explosives for coal mines used for handling coal eyes must be used, and the relevant regulations should be observed.
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