Lightweight Design and Manufacturing of Bridge Cranes — Lightweight Gantry Structures
Category: Industry News
Release time:2020-02-13
Bridge-type lifting machinery is widely used in key sectors of the national economy, including metallurgy, equipment manufacturing, transportation and logistics, and shipbuilding, playing an indispensable and vital role in economic development. As one of the crane's primary structural components, the lightweight design of the bridge girder is particularly important and represents a significant advancement in the evolution of bridge cranes.
Bridge lightweighting technology: New-generation lightweight crane bridges typically feature a four-beam structural design. The main beams are constructed as narrow-flange, fully offset-girder welded box girders, with the trolley wheel pressure transmitted directly through the track to the weld joint connecting the top flange plate to the main web plate.
Compared to the traditional semi-flanged girder design, the all-flanged box girder benefits from differing stress distributions in the main and secondary webs. As a result, the thickness of the secondary web can be thinner than that of the primary web, and the numerous small diaphragms typically found inside semi-flanged box girders can even be eliminated. This structural configuration significantly reduces welding distortions and wave deformations in the top flange of the main beam, while also minimizing downward deflection during welding. Moreover, the wide-flange design of large-tonnage flanged box girders allows for the omission of walkways altogether, further simplifying the manufacturing process and reducing overall weight. Unlike conventional cranes that rely on pressure plates to secure the rails, the lightweight crane trolley’s rail system uses square (or flat) steel sections directly welded onto the main beam. This approach integrates the rail and box girder into a single, monolithic structure capable of sharing the load together, thereby enhancing both the strength and rigidity of the main beam. Consequently, this innovative design leads to a substantial reduction in both the height and weight of the main beam.
By adopting a four-beam bridge structure, fully offset rail-welded box-shaped main girders, and carefully selecting materials while incorporating advanced design concepts such as modular end beams, the bridge crane can achieve lightweighting in its structural design.
This article was sourced from First Engineering Machinery Network.
Keywords: Lightweight Design and Manufacturing of Bridge Cranes — Lightweight Gantry Structures
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