MG20t-320t U-type double beam door type crane ee bridge-type crane ye cɔl deformation, structure like door so called door type. Electric double beam door type crane's metal structure is like a door-shaped frame, carrying four legs installed under the main beam, can walk directly on the ground's track, the main beam's two ends can have an outstretched arm beam. A tɔŋ bridge, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw, motɛr dɔw. Bridge tɩŋa box-type single beam welding structure, big car operating mechanism tɩŋa separate drive. Mechanisms aye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc ye kɔc.