Cold-hot impact three-stage coal breaking device and implementing method

Abstract

The invention relates to a cold-hot impact three-stage coal breaking device which comprises a bearing pedestal, a walking mechanism, a liquid nitrogen storage steel bottle, an air vortex tube, a water storage tank, a heat exchanger, an air heater, a jet pump, a jet fan, a liquid nitrogen boosting pump, an air heating pipe, a water cooling pipe, a liquid nitrogen cooling pipe and a jet bit, wherein the lower surface of the bearing pedestal is connected with the walking mechanism; the liquid nitrogen storage steel bottle, the air vortex tube, the water storage tank, the heat exchanger, the air heater, the jet pump, the jet fan and the liquid nitrogen boosting pump are all mounted on the upper surface of the bearing pedestal through a sliding rail and are connected with the upper surfaces of the bearing pedestal in a sliding manner. The implementing method comprises four steps of prefabricated hole drilling, prefabrication of a coal breaking group, impact coal breaking operation and drilled hole sealing. According to the cold-hot impact three-stage coal breaking device, on one hand, the working efficiency of drilling operation and the drilling permeability-increasing quality are improved, and the gas extraction is reduced; on the other hand, the gas extraction operation safety and the reliability are improved.

Description

technical field [0001] The invention relates to a heat-cold impact three-stage coal breaking device and an implementation method, belonging to the technical field of gas drainage. Background technique [0002] In China's mine gas drainage operations, the traditional mechanical drilling equipment is firstly used to drill holes on the coal seam wall, and then the boreholes are used to increase the number of cracks on the inner wall of the drilled holes through the fracturing anti-reflection device. Increase the air permeability of the borehole, and then seal the borehole and carry out gas drainage operations. Although this operation method can meet the needs of gas drainage operations, it is found in actual work that due to the The holes are often long, so the traditional mechanical drilling equipment is very prone to drill bit and drill pipe sticking in the hole during operation, and the coaxiality of the drill pipe is affected, resulting in the breakage of the drill pipe. T...

AI Technical Summary

Problems solved by technology

[0002] During mine gas drainage operations in China, the traditional mechanical drilling equipment is first used to drill holes on the coal seam wall, and then through the fracturing anti-permeability device to drill holes. To increase the number of cracks on the inner wall of the borehole, increase the air permeability of the borehole, and then seal the borehole and carry out gas drainage operations. Although this operation method can meet the needs of gas drainage operations, but In actual work, it has been found that because the boreholes used for gas drainage operations are often long, the traditional mechanical drilling equipment is prone to drill bit and drill pipe sticking in the borehole and the drill pipe being coaxial during operation. In severe cases, the stress distribution on the inner wall of the borehole will be uneven and the inner wall of the borehole will collapse. As a result, the working efficiency of the gas drainage drilling operation will be low, and the equipment failure rate will be high. Traditional mechanical drilling equipment tends to produce a large amount of dust, debris, and waste water during drilling operations, resulting in a harsh environment on the job site and greatly increasing the risk of gas and coal seam outbursts. In addition, the current After the borehole drilling is completed by mechanical drilling equipment, a fracturing antireflection device is required to perform fracturing and antireflection treatment on the borehole, which further increases the difficulty of drilling fracturing operations and reduces the risk of drilling fracturing. Therefore, in response to this problem, it is urgent to develop a new gas drainage drilling equipment and its use method to meet the needs of actual use.

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