Provides a round rotary blade for non-operation. The present invention relates to a rotary blade which is installed on a drive shaft which is rotated by a power and forms a dissolving crest, the rotary blade comprising: a plurality of connection flange portions provided at a predetermined interval in the longitudinal direction of the drive shaft; And a plurality of partitioning bodies each having a plurality of coupling holes detachably coupled to the coupling flange through a plurality of coupling members, And a circular blade portion in which the outer circumferential surfaces are continuous by assembly of the plurality of split bodies.
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