what is the gantry crane
The level set in the two legs of the bridge constitute a bridge crane gantry shape. This crane orbit on the ground , mainly used in open storage yard , shipyards , power plants , ports and railway stations and other places for cargo handling and installation. the Gantry crane hoisting mechanism , trolley traveling mechanism and bridge structures , bridge crane with basically the same . As the span, crane operating agencies were driven mostly used way to prevent the crane operation and increase the resistance generated skew even accidents. Gantry crane lifting trolley running on the bridge , some lifting trolley is a jib crane . Legs on both sides of the bridge are generally rigid legs ; during span of more than 30 meters, often rigid leg side , while the other side of the flexible legs connected by ball joints and bridge , and the door frame to become statically determinate system under external loads due to avoid lateral thrust caused additional stress can also be compensated bridge vertical temperature deformation. gantry cranes wind area, in order to prevent strong wind in the fall or tip line , equipped with anemometers and interlock with the operation of institutions crane rail clamp . Free ends of the bridge can be a cantilever ; may have one end or both ends of the cantilever arm to extend the operating range. Semi- used gantry cranes bridge legs at one end and the other end without legs , running directly on the high bench . Gantry cranes are divided into four types .
1 shipbuilding gantry cranes : for berth assembled hull , standing with two lifting car: There are two main hook of a run on the track on the bridge flange ; another has a primary and a secondary hook hook in running on the bottom flange of the rail bridge to flip and lifting large hull section . Weight is generally from 100 to 1500 tons ; span of 185 meters ; lifting speed of 2 to 15 m / min , and 0.1 to 0.5 m / min jog speed.
2 ordinary gantry cranes : This crane ( see pictures ) is the most versatile and can carry a variety of items and bulk materials , from the weight of 100 tons , a span of 4 to 35 meters. Grab the ordinary with gantry cranes working a higher level.
Gantry Cranes
Gantry Cranes
3 Station gantry cranes : for lifting and hoisting the main gate , but also for the installation. Lifting capacity of 80 to 500 tons , the span is small, 8 to 16 meters ; low lifting speed of 1 to 5 m / min. Although this is not always the crane lifting, but once the work is very heavy use , it should be appropriate to increase the working level .
4 container gantry cranes : for the container terminal . After the trailer carrying the container wharf bridge transported from the ship to unload the container yard or rear , stacking up by the container used gantry cranes or transported directly loading can accelerate bridge or other crane carrying containers turnover . Can be stacked high 3 to 4 layers , wide and 6 rows of container yard , usually with tire type , it also has a rail -style . Compared with the container Gantry crane container straddle carrier , its height and span both sides of the door frame are larger . In order to meet the transport needs of ports , the higher the level of this crane work . Lifting speed of 8 to 10 m / min ; span based on the number of containers needed across the row to determine a maximum of about 60 meters . Corresponding to 20 feet , 30 feet from the weight of 40 -foot-long containers were approximately 20 tons , 25 tons and 30 tons .