Production Most of the portal cranes run along the ground or the crane track on the building for lifting and handling operations. Gantry "" shaped crane called semi-gantry cranes, one side of the running track is located on the ground, the other side is located on the building above the ground.
According to the use can be divided into 3 categories:
Gantry cranes for loading and unloading: mainly used in ports and open stockyards, loading and unloading with grabs or hooks. Lifting capacity is generally not more than 25 tons, does not change with the amplitude. Working speed is high, so productivity is often an important indicator.
shipbuilding gantry cranes: mainly used for ship platforms, floating docks and moorings, hull splicing, equipment mooring and other lifting work, using the hook as a spreader. Maximum lifting capacity of 300 tons, the amplitude of the lifting capacity is reduced accordingly. There are many lifting speeds, and the lifting speed can be increased when the lifting weight is light. Some of the working mechanism is also equipped with micromotion device to meet the installation requirements. Door seat height is large, can adapt to the requirements of large lifting height and large-scale operation, but the working speed is low, the operation productivity is not high.
Construction and installation of gantry cranes: mainly used in hydroelectric power stations for dam pouring, equipment and prefabricated parts lifting, etc., generally with a hook. Lifting capacity and working speed is generally between the first two types of cranes. It has a good machine assembly and disassembly transportation, spreader lowering depth, can be better adapted to temporary work and work on the trestle bridge and other characteristics.
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