For a long time, most of China's self-produced reduction gear transmission equipment is a versatile product, and people often position this type of equipment in the middle and low-end products. With the acceleration of the pace of economic globalization, transmission equipment manufacturing giants in Germany, France, Japan and other countries have rushed to China and occupied the mid- to high-end market of China's reducers. In order to improve the domestic market share of domestic equipment and create national independent brands, China's chemical industry, pharmaceutical and other industries have high requirements on the sealing performance of transmission equipment. For a long time, due to poor sealing performance of domestic transmission equipment, various industrial gases, liquids, dust, etc. Severe pollution of toxic substances. In recent years, domestic large-scale reducer manufacturers have also developed high-power, coaxial gear reducers for road rollers, smashing machines, pavement excavators, etc. for construction engineering machinery and equipment; adapted to mines and underground operations. Y series gear reducer for transportation; planetary series reducer for high temperature and high pressure application equipment; more than 20 categories including hundreds of different types of jib planetary stepless speed reducer with large engineering range .