Top-shoveling and bottom-cutting type full-seam mining fully-mechanized coal mining method for extrasoft thick coal seam

Abstract

The invention provides a top-shoveling and bottom-cutting type full-seam mining fully-mechanized coal mining method for an extrasoft thick coal seam. The method comprises the following steps of: tunneling along the top of a coal seam in a mining roadway, wherein a lapping mode with a working face is a slantwise lapping mode, namely according to the propelling degree in every, manually bottoming bottom coal along the propelling direction of the work surface in a fully mechanized coal mining work surface mining roadway, and recovering the bottom coal in the roadway by using the lapping method. In the recovery process, the girder end distance of a top girder of a support is approximate to zero or a negative value, the front end of a shovel type telescopic girder is provided with a coal shoveling board, and after the bottom coal is cut by a front expansion cylinder of a coal mining machine, the coal shoveling board can timely extend out, so that top coal can be shoveled under the condition that the top coal can not be sufficiently dribbled, an exposed roof can be timely protected, and the roof caving accident can be avoided. The stroke of the telescopic coal shoveling board is greater than a web of the coal mining machine, and fallen coal is filled by a back expansion cylinder. For the coal seam condition of the extrasoft (f is less than 0.5) thick coal seam (3.5-6m), the method has the advantages of being cost-saving, simple in technology, safe, high-efficiency and the like.

Description

technical field [0001] The invention relates to a coal mining method for an extremely soft and thick coal seam, and in particular to a full-height fully mechanized mining method for the extremely soft and thick coal seam by shoveling the top and cutting the bottom. Background technique [0002] One-shot full-height coal mining is one of the efficient mining methods for thick coal seams in my country, and has been widely used in China, but it has high requirements for supports. At present, the matching method of the working face of the full-height coal mining method is generally timely support. After the coal machine drum cuts coal, the bracket moves with the machine in time, so it is called "timely support". For general thick coal seams, this support method is considered to be a reasonable support method. [0003] However, for the extremely soft (f<0.5) thick coal seam (3.5-6m), due to the weak cementation of the rock mass, the coal is in a loose state. Control, that i...

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Problems solved by technology

[0003] However, for the extremely soft (f<0.5) thick coal seam (3.5-6m), due to the weak cementation of the rock mass, the coal is in a loose state. control, that is to say, film gangs are inevitable

The above-mentioned mining technology cannot be used for normal production, and for extremely soft coal seams, how to use the characteristics of the coal seam itself to improve the mining efficiency of the coal seam to solve the problem of extremely low efficiency of other mining methods has long plagued coal enterprises.

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