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.

A bridge crane is a mechanical device used to lift heavy objects within a fixed span. It is widely used in workshops, warehouses or open spaces.