Type of gantry crane
Gantry cranes are generally classified according to the gantry structure, main beam form, and spreader form.
(1) According to the structure of the door frame
(a) Full-gantry crane: The main girder has no overhang, and the trolley is carried out within the main span.
(b) Semi-gantry cranes: The height difference of the legs can be determined according to the civil engineering requirements of the site of use.
(c) Double-overhead gantry cranes: The most common form of structure is the rational use of the structure's force and the effective use of the site area.
(d) Single cantilever gantry crane: This type of structure is often chosen due to site constraints.
(2) According to the main beam structure
(a) Single Main Girder Gantry Crane: The single main girder cantilever gantry crane has a simple structure, is easy to manufacture and install, and has a small quality. The main girder is mostly an eccentric rail box frame structure. Compared with double-girder gantry cranes, the overall stiffness is weaker. Therefore, when the weight is Q≤50t and the span is S≤35m, this form can be used. The single main beam crane has two types of L-shaped and C-shaped legs. The L-shape is easy to manufacture and install, and the stress is good. , Its own quality is small, but the space for lifting goods through the legs is relatively small. C-type legs made of inclined or curved shape, the purpose is to have a larger lateral space, so that the goods through the foot.
(b) Double beam bridge crane
Double-girder bridge cranes have strong bearing capacity, large span, good overall stability, and many varieties, but their own quality is larger and their cost is higher than single-girder gantry cranes with the same lifting capacity. According to different main beam structures , It can be divided into two forms of box beam and truss. At present, the general use of box-shaped structure.
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