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1. A folding mechanism, comprising: a supporting beam; a rotating shaft assembly, comprising a plurality of rotating shafts extended along a length direction of the supporting beam, wherein the plurality of rotating shafts comprise a positioning shaft and transmission shafts distributed on both sides of the positioning shaft, and the positioning shaft is disposed on the supporting beam; a transmission assembly sequentially coupling individual rotating shafts in series along a distribution direction of the rotating shafts, wherein any rotating shaft is rotatable around an adjacent rotating shaft; and two bearing frames coupled to both sides of the transmission assembly, wherein the two bearing frames are rotatable around the positioning shaft between a first form, an unfolded form and a second form under transmission of the rotating shaft assembly and the transmission assembly, wherein the two bearing frames and the individual rotating shafts are distributed along a plane in the unfolded form, the two bearing frames are arranged oppositely and located on a side of the positioning shaft in the first form, and the two bearing frames are arranged oppositely and located on the other side of the positioning shaft in the second form; and the transmission assembly comprises a plurality of gear pairs, each gear pair comprises two transmission gears meshed with each other that couple two rotating shafts in a transmission manner, and individual gear pairs are sequentially coupled to the individual rotating shafts along the distribution direction of the rotating shafts; and two outermost gear pairs in the distribution direction of the rotating shafts are respectively coupled to a bearing frame; and the individual gear pairs are divided into a plurality of gear chains distributed along an axial direction of a rotating shaft, and each gear chain comprises the plurality of gear pairs; and in two adjacent gear pairs of the same gear chain, two transmission gears coupled to adjacent rotating shafts are fixedly coupled.
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