A Coal Mining Method for Increasing Lump Coal Ratio in Trench Cutting Mining

Abstract

The invention discloses a coal mining method for improving the lump coal rate by cutting groove mining. The conical roller of the first cutting part cuts along the bottom plate to form a coal seam bottom groove, and the inverted cone and outward expansion type end plate of the third cutting part The pick cuts the groove behind the coal seam, and the coal block rises and falls through the wedging and cutting impact force of the inverted cone outwardly expanding end plate, and the fluctuating coal block is pushed and scraped under the action of the cone outwardly expanding end plate Trigger, the pick on the cylindrical bladeless drum cuts off unfluctuated coal and cleans the coal to ensure that the entire rear groove cutting drum passes through the coal wall smoothly; the conical drum of the second cutting part is used to clean the top plate nearby coal seams. The invention can realize full-height two-way coal mining at one time, cut the coal seam first, and then cut the coal seam and then drop the coal in layers. The walking speed is relatively fast, which can effectively improve the lump coal particle size, lump coal rate and coal mining efficiency, and reduce power consumption. , pick damage and dust generation, and can realize low-power mining of hard coal seams.

Description

technical field [0001] The invention relates to a coal mining method for increasing the lump coal rate by slot cutting and mining, which belongs to mining machinery. Background technique [0002] At present, coal mining is generally carried out with a drum shearer. When working, the drum rotates and moves radially, the picks grind and crush the coal, and then the coal cut off by the picks is pushed along the axis of the drum to the scraper conveyor on the working face by the helical blades. The working principle of the pick drop coal is milling type blanking, the loss of the pick is large, the energy consumption is high, and the work efficiency is low; and the lump coal rate is low, and the coal dust is large, causing problems such as bad coal mining environment and potential safety hazards. And it is difficult to mine hard coal seams. The economic value of lump coal is more than twice that of crushed coal. The lump coal rate is also an important economic and technical ind...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of lump coal ratio and excessively hard coal seam, the common method at present is to release the vibrating gun first to destroy the coal seam bedding, reduce the strength of the coal seam, and then use the drum shearer to mine coal, although this can also pass through the hard coal seam. The increased lump coal will reduce the working efficiency of the shearer and affect the roof to a certain extent, which will increase the difficulty of roof safety maintenance and increase additional costs

In addition, there have been many ways and methods to adopt lump coal, all of which have certain limitations, and have failed to effectively improve the lump coal rate and lump coal particle size of coal mining.

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