For more effective separation of hulls and grain the blades of the rotor comprise longitudinal plates with a bent inner end turned to the center of the rotor, also a central rectilinear part with an exterior bent. The ends are bent in the direction of rotation of the rotor. The angles of the bend of the inner and exterior end of the blades in relation tot he rectilinear section is 20-26 degrees and 40-45 degrees respectively.
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