A nitrogen injection device and method for realizing nitrogen injection

Abstract

The invention provides a nitrogen injection device and a nitrogen injection method thereof and belongs to the technical field of safe fire preventing and extinguishing of mines. The nitrogen injection device comprises a nitrogen injection tube, a reducer and a bellows, wherein the reducer is fixed on a base of a support at the end of a coal cutter, the end of a round tube at the frontmost end and composing the nitrogen injection tube is connected with first ends of hollow double shafts of the reducer through chucks, second ends of the hollow double shafts of the reducer are connected with the first end of the bellows, the second end of the bellows is connected with a nitrogen source, and the bellows is installed on a guide rail of the coal cutter. The nitrogen injection device enables nitrogen injection points to be always kept at the optimum position of a goaf, the nitrogen injection points are continuous in space, the nitrogen injection effect is good, the problem of waste caused by the fact that the nitrogen injection tube is discarded in the goaf and materials cannot be recovered can be solved, and the nitrogen injection device is strong in mobility and reduces investment cost.

Description

technical field [0001] The invention relates to a nitrogen injection device for underground gobs in coal mines and a method for realizing continuous nitrogen injection, and belongs to the technical field of mine safety fire prevention and extinguishing. Background technique [0002] At present, among all key state-owned coal mines in my country, mines with coal spontaneous combustion account for 56% of the total number of mines, and fires caused by coal spontaneous combustion account for 90-94% of the total number of mine fires. Fires caused by spontaneous combustion of coal not only seriously endanger the safe production of coal mines, but also cause a large amount of coal resource loss, underground cavities, broken rocks, underground pollution and water loss; Cracks and subsidence are formed on the ground, and the soil is deserted, releasing a large amount of poisonous and harmful gases, which seriously threaten the safety of people's lives. Nitrogen injection to prevent ...

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Problems solved by technology

[0007] The present invention provides a nitrogen injection device to solve the problems in the prior art that the nitrogen injection point is discontinuous, the amount of nitrogen injection is large, and the waste of materials leads to high cost. For this reason, the present invention adopts the following technical solutions:

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