Machining error and influence of driving gear in shearer cutting section

The transmission system of shearer cutting part is mainly composed of cutting motor, cutting drum, fixed shaft gear, gear shaft and other parts and components. The structural diagram is shown in Figure 1. After the power provided by the cutting motor is transmitted and transformed by multiple groups of gears, it outputs the cutting force with low speed and high torque, so as to drive the drum to rotate and finally complete the cutting operation. As the main part of the transmission system, the stable operation of gear is the fundamental to ensure the cutting operation of shearer. In the actual production operation, the machining error of the gear often leads to the reduction of its transmission accuracy, and even leads to all kinds of serious faults, which has a bad impact on the stability of the shearer. Therefore, the machining error and influence of gear should be studied to complete the dynamic analysis of transmission gear, so as to provide reference for the improvement and optimization of gear, so as to ensure the reliable operation of shearer.

Cutting motor 2. Rocker reducer 3. Rocker 4. Drum 5. Planetary gear transmission structure

In the processing of transmission gear, due to the influence of manufacturing environment, manufacturing process equipment and methods, technical level and processing materials, there will be different degrees of processing errors. The machining error can be reduced by improving the machining process level and management level, but it can not be completely eliminated. Therefore, it is also called gear inherent error. The machining errors of common gears include single tooth pitch error, cumulative pitch error and tooth profile error. Among them, the tooth pitch cumulative error is caused by the large tooth side clearance of the gear, which has a great impact on the gear motion accuracy. The gear meshing with tooth side clearance is shown in Figure 2.

Tooth side clearance has both positive and negative effects on gear transmission: ① on the positive side, tooth side clearance can effectively avoid the jamming phenomenon before gear action; Promote the lubrication between contact gears, reduce the wear of gears and improve the service life of gears; Reduce the influence of thermal effect on gear motion in the process of high-frequency meshing; ② On the negative side, it is easy to cause collision during gear meshing, resulting in impact force and noise, resulting in gear failure; Affect the reliability of gear torque transmission and reduce gear transmission efficiency.