Coal cutter for lump coals in hard thin seams and coal cutting method

Abstract

The invention discloses a coal cutter for lump coals in hard thin seams and a coal cutting method. Small cutting rollers and big cutting rollers are arranged on sides, facing towards a coal wall, on cutting part shells in parallel, and the small cutting rollers are located at the end part far from a coal cutter body; the small cutting roller are connected to one output end of a deceleration shunting transmission system through a connecting shaft, and the big cutting rollers are connected with the other output end of the deceleration shunting transmission system through an NGW planet gear deceleration mechanism; the surfaces, directly facing towards the big cutting rollers, of the cutting part shells are level with the surface, facing towards the coal wall, of the coal cutter body; the shells, directly facing towards the rear end surfaces of the small cutting rollers, of the cutting part shells extend towards the coal wall relative to the coal cutter body, and the cutting part shells onthe rear end surface of the small cutting roller are bent downwards; and the big cutting rollers and the small cutting rollers on the same cutting part are different in the rotation directions and rotation speeds. The coal cutter can be adapted to narrow and small spaces and complex harm structures of the lump coals, the particle sizes of the cut lump coals can be effectively increased, the lumpcoal rate can be effectively increased, and the working energy consumption is reduced.

Description

technical field [0001] The invention relates to a coal shearer, in particular to a hard thin coal seam lump coal shearer, which belongs to mining coal mining machinery. Background technique [0002] The working principle of the drum shearer is: through the rotation of the cutting drum and the radial movement, the pick grinds and breaks the coal rock, and then the coal cut off by the pick is pushed along the axis of the drum by the spiral blade. Into the working face scraper conveyor is transported out. The process of dropping coal by the pick belongs to the milling type blanking, the loss of the pick is huge, the energy consumption is high, and the work efficiency is low. Especially for thin coal seams, due to the small thickness of the coal seam and the small space for construction and installation, it is easy for the cutting drum to interfere with the scraper conveyor or hydraulic support when mining coal, and manual cleaning is required; at the same time, the mining heig...

AI Technical Summary

Problems solved by technology

[0003] In order to increase the lump coal rate in thin coal seams, the current common method is to release vibrating guns first to destroy the bedding of the coal seam and reduce the strength of the coal seam, and then use the drum shearer to mine coal with a reduced pick density. This operation can increase a certain amount of lump coal However, it will reduce the working efficiency of the shearer and increase the difficulty of roof safety maintenance, and blast mining is gradually banned due to its danger.

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