Fluidized coal mining large-range coal breaking device and using method

Abstract

The invention discloses a fluidization coal mining large-range coal breaking device and a using method. The coal breaking device comprises a supporting stand column, a spraying distance control telescopic cylinder and a spray head assembly; the bottom end of a cylinder body of the spraying distance control telescopic cylinder is hinged and installed on a telescopic cylinder mounting base of the supporting stand column, and a cylinder body swing control mechanism is further arranged between the spraying distance control telescopic cylinder and the supporting stand column; and the spray head assembly comprises a spray head and a water conveying high-pressure hose, the spray head with the spraying direction arranged in the radial direction of the supporting stand column is installed at the telescopic end of the spraying distance control telescopic cylinder through a spray head swing mechanism, the top end of the water conveying high-pressure hose is in closed communication connection with a high-pressure conveying pipe, and the bottom end of the water conveying high-pressure hose is in closed communication connection with the spray head. According to the fluidization coal mining large-range coal breaking device, the effective spraying distance of the spray head can be effectively increased, the coal mining area range of a single drilling well for ground drilling coal mining can be greatly increased on the premise that the construction cost of ground drilling is not increased, the coal mining efficiency is improved, and the mining cost is reduced.

Description

technical field [0001] The invention relates to a hydraulic coal breaking device and its use method, in particular to a large-scale coal breaking device for fluidized coal mining and its use when ground drilling is carried out for hydraulic mining of near-horizontal coal seams that are easy to protrude underground and have high safety risks. The method belongs to the technical field of coal mining. Background technique [0002] Gas disasters in China's coal mines are serious, and many mining areas are facing serious risks of coal and gas outbursts during coal mining. At present, except for a small amount of open-pit coal mining, more than 90% of coal mines in China adopt underground mining, that is, coal mining is carried out by arranging coal mining roadways underground, and the coal is transported to the ground through a transportation system. The most commonly used method is It is a longwall retreating face coal mining method. However, when underground mining is adopted...

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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