what is an overhead gantry crane？

An overhead gantry crane, also known as an overhead bridge crane or simply a bridge crane, is a type of crane that operates on an overhead beam or runway. It consists of a horizontal bridge that is supported by two or more vertical legs or columns on either side of the workspace. The bridge is equipped with a hoist and trolley system that can move along the length of the bridge, allowing for the lifting and moving of heavy objects or materials.
Overhead gantry cranes are commonly used in industrial settings, such as factories, warehouses, and construction sites, where heavy loads need to be lifted and transported. They provide a high level of flexibility and efficiency in material handling operations. The bridge can span across a large area, allowing the crane to cover a wide workspace. The hoist and trolley system can be controlled by an operator either from a cabin or with a remote control, enabling precise and safe movements of loads.
Overhead gantry cranes are known for their ability to handle heavy loads, ranging from a few tons to several hundred tons, depending on the design and capacity of the crane. They are essential for industries that require the lifting and movement of heavy objects in a controlled and efficient manner.