Underhung cranes are light and small cranes that run on rails. They can be installed directly on the roof structure of the existing factory building without the need for corbels. Therefore, they can save space, reduce costs, and use the entire factory space for production. It has the characteristics of compact structure, good rigidity, sensitive operation, low noise, safety and reliability.

The necessary components in the lifting mechanism of underhung cranes include the following parts: Wire rope or chain: used to connect lifting objects to the crane and assume the role of lifting and suspending the lifting objects; chains are generally used for heavier lifting objects, while wire ropes are suitable for larger tonnages.

Structure: Double girder cranes differ from single girder cranes by having an additional bridge. This design allows for higher lifting capacity compared to other types of cranes.

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The double-girder bridge crane is utilized for material lifting, equipment installation, and maintenance in various general working conditions. It is a widely employed lifting equipment, comprising the main beam, crane traveling mechanism, trolley, engine room, and electrical equipment.

The electric single-girder bridge crane is a workshop lifting equipment that utilizes an electric hoist and electric chain hoist as the lifting mechanism. It finds extensive applications in machining, assembly, repair, and warehouse environments.