Three-drum shearer and its cutting method for extra-thick coal seam

Abstract

The invention belongs to the technical field of fully mechanized coal mining equipment research, development and manufacture and coal mining and provides a three-drum shearer and a shearing method of ultra-thick seams to quickly, effectively and fully mine the ultra-thick seams with the thicknesses of 8 m or above. A front shearing part of the shearer shears middle-layer coal, an intermediate shearing part shears upper-layer coal on a working face, and a rear shearing part shears lower-layer coal of the working face and realizes coaling; after a front drum forms notches in the seams, the top seams are suspended, so that the pressure of the top seams is released, and the coal shearing load of a middle top-sweeping drum is greatly reduced. Three drums are utilized to divide the coal wall into an upper layer, an intermediate layer and a lower layer for simultaneous shearing, so that the shearing load is dispersed, and the purposes of reducing the shearing power of the shearer and lowering the shearing load of a single rocker are achieved; the three drums work together to successfully finish such processes as end-part oblique shearing feeding, bottom sweeping, float coal clearing and triangle coal shearing, and therefore, a feasible one-time mining whole height shearing method is provided for mining of ultra-thick seams with the thicknesses of 8 m or above.

Description

technical field [0001] The invention belongs to the technical field of R&D and manufacture of fully mechanized coal mining equipment and coal mining, and in particular relates to a three-drum shearer for extra-thick coal seams and a cutting method thereof. Background technique [0002] With the continuous development of large-scale mining high-tech in coal mine working faces, a mining process with a total height of 7m in one mining face has been formed. The coal mining face can achieve an annual output of 800M-1000Mt, and "one side of the mine, one mining area, one The high-efficiency and intensive production mode of "production line", and the related complete sets of equipment have also made great technological progress, basically forming a complete set of technology and equipment system for large mining height and fully mechanized mining with independent intellectual property rights. In particular, the mining method of ultra-thick coal seams with one-time mining and full h...

AI Technical Summary

Problems solved by technology

[0007] (1) For the three-drum shearer of the above invention, if a thick coal seam of more than 8m is to be mined, the length of the rocker arms at both ends needs to be at least about 6m. Too long rocker arms lead to huge stress on the rocker arms, poor stability, and poor compatibility , It is easy to have problems such as interference with the top beam of the bracket

At the same time, if the rocker arm is too long, it increases the distance of the oblique cutting knife, reduces the production efficiency, and is a great test for the walking part.

[0008] (2) The three-drum shearer of the above-mentioned invention has short rocker arms and large-diameter drums in the middle. Due to the limited adjustment range and the rocker arms at both ends are too long, the middle drum cannot cut through the head and tail of the working face, and coal remains Phenomenon, bring inconvenience to mining

[0009] (3) A short rocker arm and a large-diameter roller are added in the middle of the fuselage, resulting in an increase in the load of the fuselage, and the rigidity and reliability of the fuselage are difficult to meet the requirements of safe and efficient production in coal mines

[0010] (4) A large number of coal blocks cut by the middle drum cannot be loaded into the chute, and will be piled up on the fuselage, causing extrusion to the shearer, drifting of the chute, etc.

Images