Double girder gantry Crane is widely used together with winch or trolley for lifting device. 

It is a medium and heavy size crane which travels in track.

Its proper lifting weight is 5 to 10 tons and proper span is 18 to 35 meters.

Its proper working temperature is -20--+40 centigrade and with three working class: A5, A6, A7.

Gantry crane is a bridge crane whose bridge is supported on the ground track by outriggers on both sides. It is structurally composed of a gantry, a trolley running mechanism, a lifting trolley and an electrical part. Some gantry cranes have outriggers only on one side, and the other side is supported on a factory building or a trestle for operation, which is called a semi-gantry crane. The gantry crane is composed of the upper bridge (including the main beam and end beam), outriggers, and lower crossbeams. In order to expand the operating range of the crane, the main beam can extend beyond the outriggers to one or both sides to form a cantilever. A lifting trolley with an arm can also be used to expand the operating range of the crane by pitching and rotating the arm.