Shipbuilding gantry crane

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Iron and steel metallurgy, electricity, wa
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Shipbuilding gantry crane is a kind of Portal Cranes, used for Shipyard 

middle ship plate to assembly the hull. The device has two

 trolley: one set has two main hook, traveling on the up bridge

 wing margin; another has a main hook and a auxiliary hook,

traveling on the bottom bridge wing margin, two trolley running 

crossly to flip and lift the large blocks.

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