The differences between bridge cranes and gantry cranes lie in several aspects such as structure, application scenarios and performance characteristics:

Structure:
– Bridge crane: Its bridge frame travels longitudinally along the rails laid on the elevated structures on both sides and is composed of the bridge frame, traveling mechanism of the large vehicle, small vehicle, electrical equipment, etc.
– Gantry crane: The metal structure is like a portal frame, and two supporting legs are installed under the bearing main beam, which can walk directly on the rails on the ground.

Application scenarios:
– Bridge crane: It is suitable for indoor workshops, warehouses and other places with relatively limited operating space. For example, it is used to lift heavy objects in the production workshop of a factory.
– Gantry crane: It is mostly used for loading and unloading operations of goods, materials and bulk goods in outdoor yards. For example, it is used for loading and unloading containers at port terminals.

Performance characteristics:
– Bridge crane: The running speed is relatively fast, the lifting height is higher, and the lifting accuracy is higher.
– Gantry crane: It has a larger span and lifting capacity, and is adapted to outdoor operating environments with better wind resistance performance.

Examples:
– In the assembly workshop of an automobile manufacturing factory, bridge cranes are used to lift auto parts. Because the internal space of the workshop is limited, the structure of the bridge crane is more suitable for operation in such an environment.
– In a large port, gantry cranes are widely used for loading and unloading goods. Their wide span and strong lifting capacity can easily cope with the needs of a large amount of goods loading and unloading.

In conclusion, bridge cranes and gantry cranes have their own characteristics in structure and application. Users should choose the appropriate type of crane according to the specific operation requirements and environment.