How should gantry cranes be classified by purpose?

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　　With the development of society, the demand for special lifting equipment is also increasing. For example, gantry cranes are well-known among lifting devices. There are also many types of gantry cranes. So, how should gantry cranes be classified according to their purpose? Let’s take a look at it below! 　　I. Ordinary gantry cranes: These cranes mostly adopt box-type and truss-type structures and are the most widely used. It can handle various finished items and bulk materials, with a lifting capacity of up to 100 tons and a span of 4 to 39 meters. Ordinary gantry cranes equipped with grabs have a higher working class. Ordinary gantry cranes mainly refer to hook, grab, electromagnetic, and hoist-type gantry cranes, and also include semi-gantry cranes. 　　II. Gantry cranes in hydropower stations: mainly used for lifting and operating the gates, as well as for installation tasks. The lifting capacity ranges from 80 to 500 tons, with a relatively small span of 8 to 16 meters ； The lifting speed is low, ranging from 1 to 5 meters per minute. Although this type of crane is not used for lifting frequently, its workload becomes very heavy once it is put to use; therefore, the working class should be appropriately increased. 　　III. Shipbuilding gantry cranes: Used for assembling ship hulls on the shipyard floor; they are equipped with two crane trolleys – one of which has two main hooks and moves along the tracks on the upper flange of the bridge ； The other one has a main hook and an auxiliary hook, and it moves along the tracks on the lower flange of the bridge deck in order to turn over and lift large ship hull segments. The lifting capacity is generally 100 to 1500 tons ； With a span of 185 meters ； The lifting speed is 2–15 meters per minute, with a micro-speed of 0.1–0.5 meters per minute. 　　IV. Container gantry cranes: used in container terminals. After the trailer transports the containers unloaded from the ship’s container handling bridge to the yard or to a location behind it using rail-mounted cranes, container cranes are then used to stack those containers or to load them directly onto vehicles, thereby accelerating the turnover of the container handling bridge or other cranes. Yard areas where containers can be stacked 3 to 4 layers high and in 6 rows wide generally use tire-type units, though rail-type ones are also used. Compared to container straddle carriers, container gantry cranes have a greater span and higher heights on both sides of the gantry. To meet the transportation requirements of port docks, this type of crane has a high operating level. The lifting speed is 8–10 meters per minute ； The span is determined by the number of rows of containers that need to be covered, with a maximum of around 60 meters. The lifting capacity for 20-foot, 30-foot, and 40-foot long containers is approximately 20 tons, 25 tons, and 30 tons respectively.