Harbor portal crane classification

  Use can be divided into three categories:
     ① Working with portal cranes: mainly used in ports and open stockyard, loading and unloading with grab or hook. Weight is generally not more than 25 tons, not with the amplitude variations. High working speed, it is often an important indicator of productivity.
     ② shipbuilding  gantry crane   mainly used slipways, floating docks and Outfitting site for hull stitching, and other lifting equipment outfitting work, using a hook as a spreader. Maximum lifting capacity of 300 tons, from the weight of large amplitude is reduced accordingly. Multiple files lifting speed, light weight lifting can increase the lifting speed. Some agencies also work with micro-devices to meet the installation requirements. Seat height and large doors, can accommodate large lifting height and substantial requirements of the job, but the work speed is low, the job productivity is not high.
     ③ construction and installation with portal  hoist crane  : mainly used in hydropower station dam irrigation, hoisting equipment and prefabricated parts, usually with a hook. Lifting weight and working speeds generally range between the first two  jib crane  . It has good transport machine disassembly, spreader decentralization depth, can better adapt to temporary work and work on the bridge and other features.