移动式轨道龙门起重机由主梁、刚、柔性门腿、运行小车、起升机构、大车运行机构、电气系统、操作司机室等组成。根据堆场作业工艺，可将悬臂按单门腿或双门腿方向延长，成为单悬臂或双悬臂型式，不延长则为无悬臂型式。根据所在地、集装箱储运工艺流程和装卸车辆（集装箱卡车或铁路车辆）确定选用无悬臂、单悬臂、双悬臂等不同的结构形式。

Shipyard cranes are the main equipment for manufacturing ships. Currently, crane trolleys generally use rimless wheels and are designed with a guide device (horizontal wheel) added to one side of the track. This structural form reduces the manufacturing deviation and the impact of track gauge changes on the trolley operation under trolley load conditions. Rolling friction replaces sliding friction between the horizontal wheel and the side of the track, and the frictional resistance endured by the operating mechanism is greatly reduced.

The light tire-type container gantry crane for ports can meet the loading and unloading needs of existing cargo types, and has functions such as customs declaration, inspection, foreign trade, and storage. Moreover, its operation efficiency is high and it can take into account the company's subsequent container development. Light tire-type container gantry crane has the following characteristics:

In recent years, with the increasing use of offset rail beam structures (square steel welded rails located inside the box-shaped main beam), the manufacturing requirements have become higher. Let's take this structure as an example to improve it from the manufacturing aspects such as component manufacturing and processing.