The active areas of construction machinery are mostly mining sites in mountainous and desert areas that are far away from human daily life, and sometimes even work at depths of 2000 meters underground. This type of machinery has a wide variety of types, from mineral crushing machinery to cutting machinery, screening machinery, loading machinery, conveying machinery, etc., all of which operate continuously 24 hours a day. No matter which type of machinery malfunctions, it will have a great impact on the production of the mining site. Moreover, due to the recent large-scale development of machinery, maintenance operations have become very difficult.

Therefore, in terms of the usage environment of bearings, there are many very harsh conditions for bearings, such as "heavy load+impact load", "light load+high-speed rotation", "heavy load+low-speed rotation", etc. Therefore, the bearings that users desire are products with robustness, durability, and high reliability that can resist these harsh working conditions.