Abstract
In order to study the dynamic characteristics of the shearer with large mining height of 8.8 m under Oblique cutting, the spatial mechanical model of the Shearer under oblique cutting was established, the angle between the drum and the working face, the load of the drum and the dynamic characteristics of the fuselage are analyzed by discrete element method and dynamics. The results show that the maximum feed rate of the front drum is 1940mm, the maximum feed rate of the back drum is 1570mm, and the angle between the front drum and the coal wall reaches a maximum of 8° at 64s, and the cutting resistance of the front drum reaches a maximum at 80s, and finally fluctuates up and down at 3.5×105N, the cutting resistance of the back drum increases with the cutting depth, and finally fluctuates up and down at 3.0×105N. The load of the front drum is 1.2 times of that of the back drum. In the process of Oblique cutting, the support force on the lower surface of the front sliding shoe increases by 3.5×105N, the support force on the lower surface of the rear sliding shoe decreases by 2.5×105N, the support force on the upper surface of the front guiding sliding shoe increases by 1.1×105N, and the support force on the upper surface of the rear guiding sliding shoe decreases by 2.3×105N, the whole machine has the tendency of forward turning and side turning to the coal wall. The average radial force between the front rocker arm and the fuselage pin is about 1.8×106N, the average radial force between the front cylinder and the fuselage pin is about 2.2×106N, and the average radial force between the rear rocker arm and the fuselage pin is about 8.0×105N, the average radial force between the rear cylinder and the PIN shaft is about 1.3×106N, which shows that the radial force at the front of the fuselage, the rocker arm and the height of the pin shaft is obviously larger than that at the rear of the fuselage. The research results are important for the design and development of large mining height shearer.
Highlights
As the main energy source in our country, coal accounts for more than 67% of the primary energy structure; from the coal reserves, the thick coal seam accounts for about 44% of the proven coal reserves and 45% of the annual output of raw coal, the thickness of coal seams in most mining areas in China has reached the standard of thick coal seams
In view of the above problems, this paper studies the dynamic characteristics of the shearer under the condition of oblique cutting, determines the structural performance parameters in combination with the existing large mining height shearer, establishes the spatial mechanical model under the different working face inclination angle in the process of oblique cutting, obtains the change rule of the angle between the drum and the working face and the drum load by using the dynamic and discrete element analysis, and analyzes it through the dynamic software The time-domain curves of the forces on the joints between the sliding shoes and the fuselage are obtained and analyzed
When the shearer moves along the curved middle trough to cut coal, the shearer is subject to cutting resistance, coal wall thrust, traction resistance, sliding shoe reaction force, crushing resistance, For different mining methods and working face obliquity, the mechanical model of shearer's oblique cutting is different, but it can be described by the same mathematical model
Summary
As the main energy source in our country, coal accounts for more than 67% of the primary energy structure; from the coal reserves, the thick coal seam accounts for about 44% of the. In view of the above problems, this paper studies the dynamic characteristics of the shearer under the condition of oblique cutting, determines the structural performance parameters in combination with the existing large mining height shearer, establishes the spatial mechanical model under the different working face inclination angle in the process of oblique cutting, obtains the change rule of the angle between the drum and the working face and the drum load by using the dynamic and discrete element analysis, and analyzes it through the dynamic software The time-domain curves of the forces on the joints between the sliding shoes and the fuselage are obtained and analyzed
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