Construction machinery includes cranes, excavators, bulldozers, road rollers, earth moving machines, etc. The working environment of engineering machinery is harsh, dust is heavy, the load is heavy, the mechanical faults are many, and the working time is long. LRZ'sslewing bearing, deep groove ball bearing, cylindrical roller bearing, spherical roller bearing, tapered roller bearinghave the advantages of large load capacity, high performance and long service life. It ensures smooth operation of the equipment in harsh environments.