A large-scale coal breaking device for fluidized coal mining and its application method

Abstract

The invention discloses a large-scale coal breaking device for fluidized coal mining and a method for using it. The coal breaking device includes a support column, a spray distance control telescopic cylinder and a nozzle assembly; the bottom end of the spray distance control telescopic cylinder is hingedly installed on the On the mounting seat of the telescopic cylinder supporting the column, a cylinder swing control mechanism is provided between the injection distance control telescopic cylinder and the supporting column; the nozzle assembly includes a nozzle and a high-pressure water delivery hose, and the spraying direction is set along the radial direction of the supporting column The nozzle is installed on the telescopic end of the injection distance control telescopic cylinder through the nozzle swing mechanism, the top of the water delivery high-pressure hose is airtightly connected to the high-pressure delivery pipe, and the bottom end is airtightly connected to the nozzle. This large-scale coal breaking device for fluidized coal mining can effectively increase the effective spraying distance of the nozzle, and can greatly increase the coal mining area range of a single drilling for ground drilling without increasing the construction cost of ground drilling, and realize the improvement of coal mining. Coal efficiency, lower mining costs.

Description

technical field [0001] The invention relates to a hydraulic coal breaking device and a using method, in particular to a fluidized coal mining large-scale coal breaking device used when ground drilling is carried out for hydraulic mining of near-horizontal coal seams that are prone to underground outburst and high safety risks, and the use thereof The method belongs to the technical field of coal mining. Background technique [0002] The gas disaster in China's coal mines is serious, and many mining areas are facing serious risks of coal and gas outbursts in the process of coal mining. At present, except for a small amount of open-pit coal mining, more than 90% of the coal mines in China adopt the method of underground mining, that is, coal mining is carried out by arranging coal mining tunnels underground, and the coal is transported to the ground through a transportation system. The most commonly used method is It is the coal mining method of long-wall retreating working f...

AI Technical Summary

Problems solved by technology

Borehole hydraulic mining can be divided into three types: underground drilling coal mining, surface drilling coal mining and gas-liquid pulse coal mining. Among them, the use of ground drilling for water jet coal mining is the most common. One of the important technical indicators is the coal mining range, which determines the economical efficiency of water jet coal mining. The coal mining range is mainly affected by the nozzle structure, water pressure and coal hardness. However, even if the water pressure is increased as much as possible and the nozzle structure is optimized , but the impact force produced by the water jet will gradually attenuate with the increase of the injection distance. Therefore, the actual coal mining area of ​​a single well for conventional ground drilling coal mining is relatively small, usually within a radius of 2-5m. "Chicken's nest coal" with a large distribution area usually requires more ground drilling, which will increase mining costs and reduce coal mining efficiency

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