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Gantry crane classification and characteristics

 Press frame structure form
Divided gantry crane and cantilever gantry crane
Gantry crane
1. Full gantry cranes: main beam no overhang, the car in the main spans.
2. Semi gantry cranes: leg height difference, according to the civil use of space requirements.
Cantilever gantry crane
1. Double cantilever gantry crane: The most common type of structure, the effective use of force and the site area of the structure is reasonable.
2. Single Cantilever Crane: This form of structure is often due to space constraints and is selected.
Second, according to the main form of beams
1. Single girder gantry crane
Single girder gantry crane structure is simple, easy manufacture and installation, small quality of their main beam much for the partial rail box-shaped frame structure. Compared with double girder gantry crane, the overall stiffness weaker. Therefore, when the starting weight Q≤50t, when the span S≤35m, can this form. Single girder gantry crane doors leg has L and C forms. L type of manufacture and installation convenience, the force was better, the smaller their own quality, but, lifting goods through space at the relatively small number of legs. C-type legs made of sloped or curved shape, aimed at a greater horizontal space, so that goods pass foot.
2. The double girder gantry crane
Double girder gantry crane carrying capacity, span, the overall stability, variety, but the quality of their starting weight compared with the same single-girder gantry crane to be bigger, the cost is higher. Depending on the main beam structure, it can be divided into box beams and trusses in two forms. The general use of the box-shaped structure.
Third, according to the main beam structure
1. Joist
Structure using angle iron or welded I-beam, the advantage of low cost, light weight, wind resistance. However, due to the welding points and truss own shortcomings, joist deflection also has large and small stiffness, relatively low reliability, requiring frequent detection solder joints and other shortcomings. Suitable for lower security requirements, from the weight of the smaller venues.
2. Girder
Using steel plate welded into a box structure, high security, rigidity and other characteristics. Generally used for large tonnage and large tonnage gantry crane. Such as the right MGhz1200, from the weight of 1,200 tons, is the largest gantry crane, the main beam with a box beam structure. Box girder also has high cost, since the major disadvantage of poor wind resistance.
3. Cellular Beams
Usually referred to as "castellated beams isosceles triangle," the Ends of the main triangle, there are on both sides of the honeycomb oblique abdomen, upper and lower portions have a chord. Cellular beams and joists absorb the characteristics of box girders, compared with larger joist stiffness, small deflection, and higher reliability. However, due to the use of welded steel, the weight and the cost is slightly higher than the joist. Applicable to the use of frequent or large venues or lifting beam field. Because of this beam type is the patented product, thus producing fewer manufacturers.
Fourth, by use of the form
1. Ordinary gantry cranes
This multi-use container crane types and truss structure, the most widely used. You can carry a variety of bulk materials into items and, from the weight of 100 tons, a span of 4 to 39 meters. Grab common with the work of a higher level gantry crane. Common gantry crane mainly refers hook, grab, electromagnetic, hoist gantry crane, but also includes semi-gantry cranes.
2. Hydropower Station Gantry Crane
Mainly used for lifting and Gate, but also for the installation. Lifting capacity of 80 to 500 tons, small span of 8 to 16 m; the lower lifting speed of 1 to 5 m / min. This crane lifting, though not often, but once the work is very heavy use, it should be appropriate to improve the working level.
3. shipbuilding gantry crane
Hull assembly for berth, standing with two lifting car: There are two main hook of a run on the track on the bridge flange; another has a main hook and an auxiliary hook, flange under bridge running on the track, in order to flip and hoisting large hull blocks. 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.
The container gantry crane
For the container terminal. After the trailer carrying the container wharf bridge transport containers unloaded from the ship to the yard or behind, stacking up by a container gantry crane or direct loading removed, can speed up the container carrier bridge crane or other turnover. Can be stacked three to four layers, wide and 6 rows of container yard, general use tire, it also has a rail-like. Compared with container gantry crane container straddle carrier, its height and door frame on both sides of the span 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 container according to the number of rows to determine the need to cross a maximum of about 60 meters corresponding to 20 feet, from the weight of 30 feet, 40 feet long containers were about 20 tons, 25 tons and 30 tons.

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