The common sense of gantry crane
A gantry crane is a type of bridge type crane in which a horizontal bridge is placed on two legs to form a gantry shape. The cranes operate on ground tracks and are used for handling and installation operations in open storage yards, docks, power stations, ports and railway freight stations.
The structural editing gantry crane’s hoisting mechanism, trolley running mechanism and bridge structure are basically the same as the bridge crane. Due to the large span, the crane operating mechanism mostly adopts separate driving methods to prevent the crane from running skew and increase the resistance and even accidents.32t Gantry Crane
The gantry crane’s lifting trolley runs on the bridge, and some lifting trolleys are a jib crane. The legs on both sides of the bridge are generally rigid legs; when the span exceeds 30 meters, the rigid legs are often on one side, and the flexible legs connected on the other side through the ball joints and the bridge make the gantry a static system. In this way, it can avoid the additional stress caused by the lateral thrust under the external load, and can compensate the temperature deformation of the longitudinal direction of the bridge.
The wind receiving area of the gantry crane is large, and the wind gauge is installed to prevent the wind from falling or falling over by strong wind. Crane rail clamp interlocked with the operating mechanism. The bridge can be free of cantilever at both ends; it can also be cantilevered at one end or cantilevered at both ends to expand the working range. The semi-gantry crane bridge has legs at one end and no legs at the other end, running directly on the high gantry.
1. Shipbuilding gantry crane: used to assemble the hull of the ship’s rig. There are two hoisting trolleys: one has two main hooks, which runs on the rails of the upper flange of the bridge; the other has one main hook and one auxiliary hook. Running on the rails of the lower flange of the bridge to flip and hoist large hull sections. The lifting weight is generally 100-1500 tons; the span is 185 meters; the lifting speed is 2-15 meters/minute, and the fretting speed is 0.1-0.5 m/min.
2. container gantry crane: used for container terminals. After the trailer transports the container of the shore container carrying bridge from the ship to the yard or the rear, the container gantry crane is stacked or directly loaded and transported, which can speed up the turnover of the container carrier bridge or other cranes. The stacking yard of containers with a height of 3-4 layers and a width of 6 rows can be stacked, generally with a tire type, and also with a rail type. Compared with container straddle cranes, container gantry cranes have larger spans and heights on both sides of the gantry. In order to adapt to the transportation needs of the port terminal, this type of crane has a higher level of work. The lifting speed is 35~52 m/min; the span is determined according to the number of rows of containers that need to be crossed, the maximum is about 60 meters, and the lifting capacity of the “single box” operation is about 40.5 tons, respectively. “Double 20-foot box” The lifting capacity is available in 61 tons and 65 tons.PE and PEX type Jaw Crusher from China
3. Ordinary gantry crane: This type of crane is the most versatile. It can handle all kinds of pieces and bulk materials. The lifting weight is less than 100 tons and the span is 4 to 35 meters. Ordinary gantry cranes with grabs have a higher working level.
4. Hydropower station gantry crane: It is mainly used for lifting and opening and closing gates, and can also be installed. The lifting capacity is 80-500 tons, the span is small, 8-16 meters; the lifting speed is low, 1~5 meters/min. Although this type of crane is not often hoisted, it is very heavy once it is used, so it is necessary to raise the level of work appropriately.