Quarter turn scraper and scraping plate assembly thereof

The invention discloses a quarter turn scraper and a scraping plate assembly thereof. The scraping plate assembly comprises a scraping plate body, the scraping plate body comprises a connecting middlepart used for being connected with a chain and action parts located on the two sides of the connecting middle part, the bottom face of the connecting middle part is provided with a flat ring groove used for buckling connection of a chain flat ring, vertical ring grooves used for containing a chain vertical ring and limiting the chain vertical ring are mounted at the positions, corresponding to the flat ring groove, of the two sides of the bottom of the connecting middle part, the chain flat ring and the connecting middle part of the scraping plate body are fixedly connected through cooperation of a U-shaped bolt and a loosening-prevention nut, a mounting groove hole used for containing the loosening-prevention nut is formed in the connecting middle part of the scraping plate body, a rotation-prevention gasket use