Very soft thick coal seam forepoling hold top coal caving mining method and hydraulic support structure

Abstract

The invention discloses a very soft thick coal seam hold and full-mechanized top coal caving mining method and a top coal caving hydraulic support structure which is applicable to the process requirements of very soft coal seam hold and full-mechanized top coal caving, and the method can form the hold mining process features by using a roller of a coal mining machine to cut and load coal under a top beam of the support, realize the full-closed mining of a working face, and lead the beam end distance of the top beam (the distance between the front end of the top beam and the coal wall when using the coal mining machine to cut and mine) to be close to zero or be a negative value, and a coal shoveling plate is arranged at the front end of a shovel type telescopic beam, thereby being capable of shoveling off top coal under the situation that the coal wall spalling is insufficient, protecting an exposed top plate under the situation that the coal wall is sufficiently spalled and further avoiding the large-area roof-fall accidents, wherein the telescopic stroke of a jack of the telescopic beam is larger than a web of the coal mining machine. The method can realize the full-mechanized mining of a very soft coal seam and has the advantages of low cost, simple process, safety, high efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of coal mining support equipment in coal mines, and belongs to a matching type of coal mining method for top coal caving in extremely soft and thick coal seams and equipment. Background technique [0002] Fully mechanized top-coal caving is one of the high-efficiency mining methods for thick coal seams in my country, and it has been widely used throughout the country. Top-coal caving hydraulic support is the key equipment for the top-coal caving mining method. At present, the equipment supporting method of fully mechanized top-coal caving coal mining method is generally timely support. With a certain beam end distance, after the shearer drum cuts coal, the bracket will move with the machine in time, so it is called "timely support". For general thick coal seams, this fully mechanized caving mining support method is considered to be the most reasonable support method. [0003] However, for extremely soft an...

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Problems solved by technology

[0003] However, for extremely soft and thick coal seams, due to the weak cementation of the coal and rock mass, the coal is in a loose state. Under the action of the mining advance pressure, the top coal flakes in front of the coal wall and the support are serious and uncontrollable. The above-mentioned fully mechanized caving mining technology cannot normal production

With other mining methods, the efficiency is extremely low and the recovery rate is extremely low. This problem has plagued coal enterprises for a long time

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