The coal mining machine is one of the main equipment in the complete set of comprehensive mining equipment. The coal mining machine evolved from the development of coal cutting machines. The coal mining machine is a large and complex system that integrates mechanical, electrical, and hydraulic systems. The working environment is harsh, and if there is a malfunction, it will cause the entire coal mining work to be interrupted, causing huge economic losses. Coal mining machine is one of the important equipment for achieving mechanization and modernization of coal mine production. Mechanized coal mining can reduce physical labor, improve safety, and achieve the goals of high yield, high efficiency, and low consumption. In a long wall coal mining face, a mining machine that uses a working mechanism to break coal from the coal body and load it into the face conveyor (coal loading). The coal mining machine travels at the set traction speed (traction), enabling continuous coal breaking and loading processes. The general term for the working mechanism of the cutting department and its mechanical transmission or driving devices. When the cutting part is driven by a dedicated electric motor, the cutting part also includes the cutting motor. The working mechanism is a component that directly realizes the main functions of cutting, crushing, etc. It is equipped with cutting teeth, which break coal from the coal body. Some working mechanisms of coal mining machines have one or several auxiliary working mechanisms in addition to one main working mechanism in order to form the required cutting section shape. The working mechanism often has the function of loading broken coal blocks into the conveyor of the working face, and using this type of working mechanism no longer requires a separate loading department for the coal mining machine. The mechanical transmission device is used to transmit power to the working mechanism to meet the requirements of its movement mode, direction, and cutting speed. Mechanical transmission devices usually use gear transmission, which cannot change speed during use, but are equipped with specialized gear pairs for replacement during installation to meet the cutting speed requirements. The mechanical transmission device can be composed of one or more boxes according to structural requirements
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