China is a major coal producing country in the world. In order to adapt to the rapid increase in coal demand, the installed power of many coal mining machinery has increased exponentially. Therefore, the requirements for the mechanical transmission part are becoming higher and higher. The traditional fixed axis gear transmission structure can no longer meet the new work requirements, and the use of planetary gear transmission in coal mining machinery is imperative. The planetary gear transmission of the planetary reducer has the characteristic of power diversion, and its central wheels can form a coaxial linear transmission. Moreover, the internal meshing gear pair is reasonably applied, which can achieve the characteristics of small volume, light weight, compact structure, and strong load-bearing capacity.

In addition, the symmetry of the planetary gear transmission structure also balances the reaction forces acting on the central wheel and the arm bearings, which is beneficial for improving transmission efficiency, with efficiency values reaching 0.97-0.99; Due to the use of multiple planetary gears with the same structure, which are evenly distributed around the central wheel, the inertia force between the planetary gears and the rotating arm can be balanced, increasing the number of gears involved in meshing, achieving smooth operation of the planetary transmission, enhancing the ability to resist impact and vibration, and improving work reliability; And as long as the appropriate planetary gear transmission type and gear matching scheme are selected, a small number of gears can be used to achieve a large transmission ratio.