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This design uses the operational principle of hydraulic turbines, which bonds manhole covers and turbines effectively, featuring a combination of manhole covers, screw arbors and fan blades. When the falling rainwater can drive the fan blade, the manhole cover goes down accordingly. There are two springs connecting between the covers and the supporting surface. When water displacement is reduced to a certain amount and the blades rotating force is less than the spring back, the manhole cover will automatically restore to the original position.
liaoning shihua university
fushun city, China
Liu zhaolong Dong xiaori