Coal mining machine and roller thereof

Abstract

The invention discloses a coal mining machine and a roller thereof. The coal mining machine comprises a roller body, an end disc, two spiral blades or more and a plurality of cutting teeth, wherein the end disc is fixedly connected with one end of the roller body and is positioned at one end, facing the coal wall, of the roller body; each spiral blade is arranged along the circumferential direction of the roller body; the end part of each spiral blade is fixedly connected with the end disc; each spiral blade comprises a divergent section and an equal-diameter section; the width of the divergent section is gradually increased from the end disc side and is finally equal to the width of the equal-diameter section; the plurality of cutting teeth are arranged on the end disc and the spiral blades at intervals. The occurrence of coal wall rib fall and roof caving accidents can be effectively reduced; the safety of coal mine production can be greatly improved.

Description

technical field [0001] The present invention generally relates to a coal shearer, and in particular, relates to a coal shearer and a drum thereof. Background technique [0002] Coal wall side and end face roof fall are common accidents that occur in the mining process of thick coal seams in coal mines. After accidents, it is easy to cause shutdown of the working face, equipment damage, and even serious losses such as casualties. Therefore, coal wall fragmentation has become one of the hot issues in the management of coal mine disasters, and a series of treatment plans have been formed for this problem. However, most of the schemes and measures adopted are aimed at the reinforcement of the coal wall or the relief of roof pressure, without considering the impact of the space form formed by the shearer drum cutting the coal wall on the coal wall slab. The spiral drum is a mechanism for self-opening the working face of the shearer, dropping coal, and loading coal. The spiral dr...

AI Technical Summary

Problems solved by technology

However, no attention has been paid to the influence of the shape of the spiral blade on coal mining. The rotating envelope surface of the spiral blade of a traditional shearer is a cylindrical surface. After cutting the coal body, the roof and the coal wall form a right-angled area. Due to the stress concentration effect, the coal wall is very easy to be damaged here, which eventually leads to roof fall accidents at the side of the coal mine, especially in thick coal seam working faces. The increase in mining height makes the problems of side and end leakage more prominent. The falling of large coal and rock masses at high places can easily cause casualties, damage equipment, and take a long time to deal with accidents, which does not meet the requirements of safe production and high-yield and efficient production

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