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Gantry crane is a kind of bridge crane in which the horizontal bridge is arranged on two legs to form the shape of the gantry.This crane operates on ground rails and is mainly used for handling and installation in open storage yards, shipyards, power stations, ports and railway freight stations.
Gantry crane lifting mechanism, trolley running mechanism and bridge structure, and bridge crane is basically the same. Due to the large span, the crane operating mechanism mostly adopts the separate driving mode, in order to prevent the crane to produce skew operation and increase the resistance, and even the accident. Gantry crane crane trolley running on the bridge, some crane trolley is a boom crane. The legs on both sides of the bridge are generally rigid legs; When the span is more than 30 meters, one side is often rigid leg, and the other side is flexible leg connected by the ball hinge and bridge, so that the gantry becomes a static determined system, which can avoid additional stress caused by lateral thrust under the action of external load, but also can compensate the longitudinal temperature deformation of the bridge. The wind area of the gantry crane is large, in order to prevent sliding or tipping over under the action of strong winds, Crane rail clamp equipped with wind gauge and interlocking with operating mechanism; It can also be cantilevered at one end or cantilevered at both ends to extend the range of operation. The bridge of semi-gantry crane has legs at one end and no legs at the other end. It runs directly on the high platform.
(1)Ordinary gantry crane: This crane is the most widely used, can carry a variety of pieces and loose materials, lifting weight of less than 100 tons, span of 4 ~ 35 meters. The ordinary gantry crane with Grab works at a higher level.
â‘¡ gantry crane of hydro power station: mainly used for lifting and opening and closing the gate, but also for installation. Up to 80 ~ 500 tons of weight, span is small, 8 ~ 16 meters; The lifting speed is low, ranging from 1 to 5 m/min. Although this crane is not often lifted, but once the use of work is very heavy, so we should appropriately improve the level of work.
(3) Shipbuilding gantry crane: It is used to assemble the hull of the ship berth. There are two lifting carts: one has two main hooks, which runs on the track of the flange of the bridge; The other, with a main hook and a secondary hook, runs on rails at the lower flange of the bridge to flip and lift large hull sections. The lifting weight is generally 100 ~ 1500 tons; Span up to 185 meters; The lifting speed is 2 ~ 15 m/min, and the fretting speed is 0.1 ~ 0.5 m/min.
(4) Container gantry crane: used in container terminals. After the containers unloaded from the shore wall container carrying bridge are transported to the yard or rear by the trailer, they are piled up by the gantry crane or loaded directly to the truck, which can speed up the turnover of the container carrying bridge or other cranes. The container yard can be stacked 3 ~ 4 layers high and 6 rows wide. Generally, the yard uses the tire type and also uses the rail type. Compared with the container gantry crane, its span and the height of both sides of the gantry are larger. In order to adapt to the transportation needs of the port terminal, this crane works at a higher level. The lifting speed is 35 ~ 52 m/min; The span is determined by the number of container rows to be crossed. The maximum size is about 60 meters. The lifting weight of the container in the "single box" operation is about 40.5 tons, and the lifting weight of the "double 20-foot box" operation is 61 tons and 65 tons.
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