Bottom cleaning drum shearer for thin coal seams

Abstract

The invention provides a bottom cleaning drum shearer for thin coal seams. The drum shearer is characterized in that a cutting part shell comprises a first cutting drum transmission cavity shell, a transition section shell and a second cutting drum transmission cavity shell; the first cutting drum transmission cavity shell extends out of ledges of a middle groove and transition groove of a scraper conveyer towards the coal wall side via the transition section shell and bends towards the lower part; a top slope cut edge structure and a bottom slope cut edge structure are arranged at the rear end of the transition section shell; inner cavity flanges of first and second planetary mechanisms are respectively connected with inner cavity flanges of the first and second cutting drum transmission cavity shells by bolts; outer end face key grooves of the first and second planetary mechanisms are respectively positioned together with outer end face key grooves of the first and second cutting drum transmission cavity shells by end face flat keys. The drum shearer can be used for effectively solving the problem of triangle coal and satisfy the minimum mining height conditions and the adaptability to change of the thickness of coal seams, and conduces to improving the coal charging effects.

Description

technical field [0001] The invention relates to the field of coal mining machinery, in particular to a bottom-clearing drum shearer for thin coal seams. Background technique [0002] At present, in order to meet the requirements of coal seam thickness and the adaptability of coal seam thickness changes, the thin coal seam drum shearer chooses a smaller diameter cutting drum, which leads to a shallow blade depth of the cutting drum, which seriously affects the coal loading effect. It is also necessary to adopt a curved rocker arm structure to enlarge the coal opening, which results in a small lifting amount of the cutting drum. In addition, in order to ensure the shovel spacing of the cutting drum, the shell at the end of the straight tooth transmission of the cutting part needs to ride on the side of the scraper conveyor, which results in a small undercover amount of the cutting drum. Due to the small amount of top lifting and undercover, the adaptability of fully mechanize...

AI Technical Summary

Problems solved by technology

However, although increasing the diameter of the cutting drum of the shearer can effectively solve the problems of low coal loading effect, too small amount of overhead and undercover, and "triangular coal", it is limited by the specific mining height and increases with the diameter of the cutting drum. If the shearer is increased, the adaptability of the shearer to the change of coal seam thickness will be worse, and the required cutting force will be greater, and the cutting power and the overall performance and size of the cutting part will need to be increased accordingly. The cost of machinery manufacturing and process requirements It should also be improved accordingly; the outer diameter of the planetary mechanism can be reduced by changing the number of teeth and the modulus of the planetary mechanism, and the blade depth of the cutting drum can be increased. Although the coal loading effect can be improved, the gear strength and bearing life of the planetary mechanism will be correspondingly reduced. Small; reducing the curvature of the rocker arm, although it can increase the amount of the top, but seriously affects the size of the coal mouth; increasing the coal baffle will increase the distance between the shovels, and the coal loading effect cannot be effectively improved; reduce the scraper conveyor groove side Although the height and the slope of the transition groove can increase the amount of undercover and reduce the "triangular coal", it seriously affects the overall performance of the scraper machine

It can be seen that, with the above method, the problems of poor coal loading effect of shearer, poor adaptability of fully mechanized mining work, poor adaptability of coal seam thickness change and "triangular coal" cannot be effectively solved

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