Port large lifting equipment, including quayside container crane, gantry crane, gantry crane, etc., are the main lifting equipment for port loading and unloading operations. With the continuous development of lifting machinery technology, the requirements of various working conditions are improved, and the technical content of each link of the equipment is required to be improved. Bearing, as the main part of machinery used to support fixed shaft and bear the load, its function is obvious. Without the use of all kinds of bearings, the various actions of the equipment will not work normally. The large cranes used in the seaport have been working in the marine climate with a lot of salt fog, high humidity and large temperature difference for a long time. The large crane working in the inland port will also be affected by the industrial atmosphere and severe climate; when the large equipment in the port is operating, multiple actions are carried out at the same time, and multiple loads are superimposed at the same time, which have a great impact on the use of bearings. WZZZ bearing in understanding the use of customers, according to the requirements of customers, a series of products meet the requirements of customers, to achieve the international advanced level.