Introduction： The hook type fixed port crane adopts single boom, wire rope luffing and four-point contact ball slewing bearing structure, and is equipped with pulley compensation device, which can make the goods move approximately horizontally and realize full load luffing, with fast luffing speed, high operating efficiency and 360 ° full rotation. This machine is characterized by novel structure, stable transmission, high efficiency, convenient operation and low failure rate. According to user requirements, variable frequency control can be used to ensure more stable and reliable operation of all mechanisms