... good view. High quality automatic welding and NDT inspection. Crane drive: IP54 or IP44, level F insulation. Designed according to ... trolley rail. The trolley of bridge crane are assembled with motor, reducer, brake, trolley frame, drum, hook, pulley, rain cover ... works as long traveling mechanism, and it combines with beam, Wheel,Motor, Reducer, Brake and Other Parts. We choose high quality electric ...