Marine cranes are suitable for loading and unloading general cargo or loose cargo in shipyards, or for removing river sludge and other operations. This model is a single arm angle steel truss type, with steel wire rope amplitude changing and rotating support using four point contact single ball ball bearings, which can achieve 360 ° full rotation and operate smoothly. This model can be used for both lifting hooks and grab buckets. This model is designed and manufactured in accordance with the "GB3811-2008 Crane Design Specification" and the "GB6067-2010 Crane Safety Regulations". It is a type of crane used for transportation operations in marine environments, mainly for important tasks such as transporting and transferring goods between ships, supplying at sea, and releasing and retrieving underwater equipment. The application environment at sea has brought great difficulties to the control of ship cranes. On the one hand, similar to onshore underactuated crane equipment, it is necessary to control the swing generated during load transportation to ensure its positioning accuracy and transportation efficiency; On the other hand, since this type of crane is fixed on a moving platform such as a ship, the movement of the platform itself will have a strong impact on the movement of the load, and the movement of the load at the lifting and landing points is different from that of the crane itself.