Electric single girder crane is a kind of light and small lifting equipment, running on I-beam track, with heavy loads hanging on it, relatively simple and more applications. It is mainly composed of electric hoist, metal structure, trolley running mechanism, feeder device and electrical device.

LD type electric single girder crane refers to: electric hoist trolley running on the lower flange of the main girder, electric hoist arranged under the main girder of the bridge cranes.