Gantry cranes are a variant of bridge cranes, primarily used for outdoor loading and unloading operations of cargo, materials, and bulk goods. Their metal structure resembles a gate frame, supporting two legs under the main beam, allowing them to move directly on ground tracks. The main beam can have cantilever beams extending at both ends. Gantry cranes feature high site utilization, wide operational range, broad adaptability, and strong versatility, and are widely used in cargo handling and transportation operations at ports, docks, yards, and factories.