Gantry Crane

A gantry crane has a bridge supported by legs that travel on ground-level rails. It comprises a gantry frame, a crane travelling mechanism, a lifting trolley and electrical equipment. A semi-gantry crane has legs on one side and is supported by a building or elevated structure on the other.

The gantry crane is composed of the upper bridge frame (including main beam and end beam), outriggers, lower beam and other parts. In order to expand the crane's operating range, the main beam can extend beyond the outriggers to one or both sides to form a cantilever. A lifting trolley with a boom can also be used to expand the crane's operating range through the pitching and rotation of the boom.