Swing arm of short-span coal mining machine for thin coal seam

Abstract

The invention relates to a thin seam short-span coal mining machine swing arm which comprises a swing arm shell, a main body of the swing arm shell is an arm frame extending left and right, a cutting transmission mechanism is installed in the arm frame, and the ends where an input end gear and an output end gear of the cutting transmission mechanism are located serve as the high-speed end and the low-speed end of the arm frame respectively. A connecting arm overhanging forwards from the arm support is arranged in the middle of the arm support, a front arm overhanging leftwards or rightwards from the connecting arm is arranged on the connecting arm, the front arm is located in front of the high-speed end of the arm support, and a front pin shaft mounting hole and a rear pin shaft mounting hole are formed in the front portion of the front arm and the front portion of the high-speed end of the arm support respectively and used for a cutting motor to serve as a pin shaft to be mounted in the front pin shaft mounting hole. The input end gear is installed on the rear portion of the high-speed end of the arm support, and the front pin shaft installation hole and the rear pin shaft installation hole are both coaxial with the input end gear. According to the invention, a larger mining range and larger cutting power can be provided, the machine body can be shortened, and the gravity center of the coal mining machine can be improved.

Description

Technical field [0001] The present invention relates to a shearer swing arm, in particular suitable for thin coal seam short span shearer, can provide a large mining range for the shearer. Background [0002] On existing thin-seam shearers, the cutting motor is usually located on the rocker arm and oscillates with the swing arm. When the back swing arm of this thin coal seam suspension fuselage shearer is mined in the direction of travel, there will be a problem that the height of the rear drum is too small, because when the mining height is increased, the rear rocker arm cutting motor will interfere with the upper coal table left behind the front drum cutting bottom knife, so the overall mining height of this shearer is too narrow, and it cannot adapt to the mining requirements of the large change in the thickness of the ore layer of the working surface of the thin coal seam in China. [0003] In view of the above problems, the industry has proposed that the cutting part be the...

AI Technical Summary

Problems solved by technology

When the rear rocker arm of the thin coal seam suspension body shearer picks the upper knife, there will be a problem that the mining height of the rear drum is too small. The reason is that when the mining height increases, the cutting motor of the rear rocker arm will It will interfere with the upper coal platform left behind the bottom cutting knife of the front drum, so the overall mining height of this kind of shearer is too narrow to meet the mining requirements of my country's thin coal seam working face with large changes in seam thickness

[0003] In response to the above problems, the industry once proposed to divide the cutting part into a swing part and a fixed part, and set the cutting motor and the main body of the cutting transmission system in the fixed part, resulting in the structure of the fixed part being too complicated, and the left and right lengths of the overhanging section of the fuselage are skewed. Long and heavy, the problem of the center of gravity of the whole machine still has a great influence on the force of the whole machine

In addition, the shearer with a long body structure cannot perform the straight-feeding knife process similar to the short-wall shearer, and the oblique cutting at both ends takes a long time, which limits the mining efficiency to a certain extent.

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