Scraping device of flotation machine

The scraping device comprises a flotation tank, a supporting rod and a scraping plate, the scraping plate is fixedly installed on the surface of the supporting rod, the top of the flotation tank is connected with a supporting column capable of moving front and back, the surface of the supporting column is rotationally connected with a rotating column, the surface of the supporting column is provided with a clamping assembly, and the clamping assembly is fixedly connected with the supporting column. The supporting column and the rotating column are mutually fixed through a clamping assembly, a rotating shaft is fixedly connected to the end of the supporting rod, a second motor is fixedly installed on the surface of the supporting column, a transmission rod is fixedly connected to an output shaft of the second motor, and a limiting protruding block is fixedly connected to the surface of the transmission rod. And a limiting groove allowing the limiting protruding block to be embedded is formed in the surface of