Air-water linkage device for underground coal mine drilling

Abstract

The invention provides an air-water linkage device for underground coal mine drilling, and relates to the technical field of coal mine drilling. The air-water linkage device for underground coal minedrilling can reduce the strength of a spray hole and play a role in fire prevention and dust reduction, automatic water distribution during drilling can be achieved, water distribution is automatically stopped when drilling is stopped, and the water distribution amount is controllable and adjustable according to the water content of a coal seam. During drilling construction, a small amount of water is automatically added into a compressed air pipeline to form water mist, the water mist and sprayed coal are evenly mixed to form coal slag with a reasonable ratio, smooth drilling is guaranteed, the dust concentration can be reduced, the operation environment is improved, meanwhile, the cooling effect of a drilling tool is improved, the high-temperature abrasion degree of a drill bit is reduced, and the risk of drill burning or in-hole ignition is reduced. The device is suitable for compressed air deslagging and compressed air and mechanical mixing deslagging drilling.

Description

technical field [0001] The invention relates to the technical field of coal mine drilling, in particular to a wind-water linkage device for underground drilling in coal mines. Background technique [0002] At present, three types of slag discharge are mainly used in the underground construction of coal mines: water, compressed air and mechanical. Compressed air slag discharge, with large dust and poor working environment, is easy to cause fire in the hole; mechanical slag discharge, relatively low dust, slag discharge capacity is restricted by many factors, easy to cause fire in the hole; water slag discharge, small dust, not easy In-hole fires can occur, but are exacerbated by drilling mid-holes in outburst coal seams. The reasons for the aggravation of water slag discharge injection holes in outburst coal seams are mainly caused by the joint action of three factors. On the one hand, water reduces the strength of the coal body on the hole wall, which easily makes the hole ...

AI Technical Summary

Problems solved by technology

Compressed air slag discharge, with large dust and poor working environment, is easy to cause fire in the hole; mechanical slag discharge, relatively low dust, slag discharge capacity is restricted by many factors, easy to cause fire in the hole; water slag discharge, small dust, not easy In-hole fires can occur, but are exacerbated by drilling mid-holes in outburst coal seams

The reasons for the aggravation of water slag discharge injection holes in outburst coal seams are mainly caused by the joint action of three factors. On the one hand, water reduces the strength of the coal body on the hole wall, which easily makes the hole wall unstable and collapses, increasing the probability of injection holes; on the other hand, Water and coal cinders are disturbed by the drilling tool and have low air permeability, which is easy to block the drill hole and form a pressure-bearing gas bag in the hole. When the pressure-bearing gas is enough to overcome the obstacle, the injection hole will occur; on the other hand, the hole in front of the injection hole The wall coal body is under pressure, and the hole wall coal body is pressure-relieved during the injection hole, and the hole wall coal body is frequently under pressure and pressure relief, which reduces the stability of the coal body, resulting in an increase in the frequency of injection holes and an increase in the strength of the injection holes

[0003] Nozzles will cause a series of safety problems, which are mainly manifested in the following aspects: first, a large amount of coal dust is ejected and accumulated in the roadway, which affects the operation and sanitary conditions; second, the coal dust and gas ejected at high speed are easy to damage Operators, especially in the process of replacing, disassembling and installing drill pipes, the spray holes are more likely to hurt the workers; the third is the high-strength spray holes, which can easily cause the blowout preventer to fail, and even cause the blowout preventer to move as a whole and hurt the workers , lock or bury the drilling rig, and block the safe retreat of the drilling personnel; Fourth, coal injection is accompanied by a large amount of rapid gas ejection, which will easily lead to the overrun of the wind flow and gas in the work site and return air system, and in severe cases, the wind flow at the construction site will be reversed and personnel will be suffocated ; Fifth, when the gas concentration at the operating point and the return air flow reaches the range of explosive concentration, a gas explosion will occur in case of fire

[0004] Mechanical slag discharge method has low slag discharge capacity and limited drilling depth; pressurized air slag discharge, compressed air and mechanical mixed slag discharge method has strong slag discharge capacity, but the dust concentration is high, the environment pollution is serious, and fire accidents in the hole are prone to occur ; The water slag discharge method has strong slag discharge ability, but the frequency of injection holes is significantly increased, and the intensity of injection holes is significantly enhanced. It is urgent to develop a new device that can reduce the frequency of injection holes, reduce the intensity of injection holes, and reduce the amount of dust produced. , Improve the working environment, reduce the temperature of the drill bit, prevent the high temperature caused by the friction of the drill bit and cause the risk of fire in the hole

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