Method for recovering large mining height fully-mechanized face end part ground coal

Abstract

The invention discloses a method for recovering large mining height fully-mechanized face end part ground coal. The method comprises the following steps of: setting up 2 to 3 groups of supports on one side close to a working face in a return air drift of a large mining height fully-mechanized face; according to the daily advancement degree, performing manual advancing bottoming on the ground coal along the advancing direction of the working face in a transport drift of the large mining height fully-mechanized face, wherein the bottoming length is 4 to 6 meters, the bottoming height is 1 to 1.5 meters, and the bottoming gradient gamma is less than 10 degree; performing ascending coal cutting from the transport drift to the return air drift or performing descending coal cutting from the return air drift to the transport shift by adopting a coal mining machine; and after finishing the coal cutting of the return air drift by the coal mining machine, manually recycling a step remained close to an external upper in the return air drift to ensure that the ground coal on the upper end part and the lower end part of the large mining height fully-mechanized face is recovered continuously during the mining on the working face. The method has a simple process, convenient construction and easy operation, improves the coal mining rate of the large mining height face by about 4 percent, reduces influences caused by the ground coal to fully-mechanized production, and has extensive practicability.

Description

technical field [0001] The invention relates to a method for recovering the bottom coal at the end, in particular to a method for recovering the bottom coal at the end of a fully mechanized mining face with a large mining height. Background technique [0002] Large mining height fully mechanized mining technology is a new technology for efficient mining of thick coal seams. Due to its high recovery rate and good safety conditions, it has gradually replaced fully mechanized caving mining in the past five years and has become the mainstream mining technology for coal seams with a thickness of about 6m. . [0003] Restricted by the roadway excavation technology and support means, the height of the mining roadway is generally below 3.5m at present, resulting in a height difference of about 2.5m between the height of the roadway and the coal cutting height of the coal mining machine in the fully mechanized mining face with a large mining height (about 6m). In order to make a rea...

AI Technical Summary

Problems solved by technology

The former is limited by the existing support means, the amount of recovered coal is limited, and at the same time it will greatly increase the cost of roadway excavation and maintenance; the latter is prone to collapse, collapse, and difficulty in moving the support due to the excessive inclination angle of the hydraulic support. Affect the production of the working face

[0005] To sum up, the existing technology is passive, dangerous and expensive for recovering the bottom coal at the end of the large mining height working face, which greatly limits the efficient mining of the large mining height fully mechanized mining face

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