Mining Method of Picking Coal in Steeply Inclined Coal Seam

Abstract

The invention discloses a method for picking and mining coal seams with a coal seam thickness of 0.6-12 meters and a steep coal seam with an inclination angle greater than 45 degrees. Delineate the mining block section, and excavate a number of inclined roadways from the inside to the outside along the coal seam; use the part between the two coal-sprinkling and cleaning inclined roadways as the mining face, install hydraulic support, coal mining equipment and facilities; The coal equipment cuts, cuts and drops the coal downwards on the coal wall of the mining face; squeezes, breaks and drops the triangular coal left on the top and floor sides through the hydraulic support, and the hydraulic support moves down under the action of its own weight and the falling body of the gob The move is completed. In the method of the invention, the working face is arranged horizontally, which realizes the mechanization of coal mining, support, and transportation in this type of coal seam, rewrites the current situation of manual and semi-mechanized mining, and ensures safe production and environmental conditions. Coal mining efficiency and recovery rate High, reduce labor intensity and cost of workers.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a method for picking and mining coal in steeply inclined coal seams. Background technique [0002] For small coal mines with a coal seam thickness of 0.6-12 meters and an inclination angle greater than 45 degrees, the working face is short and the working space is narrow. In the prior art, the following methods are often used for coal mining: [0003] 1. Step method: The step method is divided into two types: positive steps and inverted steps. The transportation chute and return air chute of the working face are arranged at the lower level and the upper level of the stage, and the working face is arranged in a stepped direction along the inclined direction, and the direction is advanced. The working face is supported by wooden pillars. Set up several platforms on the reserved coal seam platform or on the point column as the operating space for workers. The coal was exc...

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Problems solved by technology

[0004] The step method mainly has the following problems: the operating space of the workers is narrow and there is a risk of instability and falling; artificial support, coal mining, drilling and blasting, manuscript excavation, and erection of sliding coal slabs, the labor intensity is high and the efficiency is low; the output of the working face is low, and the annual output Only tens of thousands of tons

[0006] The coal mining method with pseudo-inclined flexible cover supports mainly has the following problems: the workload of support installation and withdrawal is too large and cumbersome, the space for workers to operate is narrow, the accumulation of floating coal is large, and the coal dust is flying; Manual operations such as Tangci chutes are labor-intensive and inefficient; the output of the working face is low, with an annual output record of more than 200,000 tons, with an average of 90,000 tons; poor adaptability to changes in coal seam thickness

[0008] The sub-section dense coal mining method with dipping and pseudo-inclination mainly has the following problems: a lot of floating coal is accumulated, and coal dust is flying; manual support, drilling and blasting, and setting up pond magnetic chutes are labor-intensive and inefficient; the output of the working face is low

[0010] The horizontal layered coal mining method mainly has the following problems: the volume of roadway excavation is huge, and there is a lot of floating coal accumulation; the ventilation system is complicated, and there is a risk of air leakage and wind flow disorder in the gob; High strength, low efficiency; low output of working face

[0013] The main problems of the horizontal sub-caving coal mining method are as follows: the coal recovery rate is low, resulting in a large waste of resources; the residual coal in the goaf is on fire, resulting in the accumulation of harmful gas in the goaf, and the gas in the working face exceeds the limit; the output is also not high

[0015] The warehouse-style coal mining method mainly has the following problems: workers drill and blast in unsupported working spaces, the environment and safety conditions are harsh, and the labor intensity is high; the efficiency of drilling and blasting is low, and the output is limited; After the wind-inlet vertical eye is damaged, it is necessary to use well-shaped wooden piles for support, and the support wood is all built by manual splitting and buckling

[0016] It can be seen from the above methods that the above methods are suitable for mines with small well types (that is, what is often called "small coal kilns"), but the above methods generally have the following disadvantages in coal mining: the working environment for workers is harsh; the safety risk is high; the efficacy is low; The degree of mechanization is extremely low, there is almost no machinery, and it is completely manual excavation; production capacity is limited; coal recovery rate cannot be guaranteed

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