Self-cleaning screw conveyor

Abstract From the Canadian patent

A screw conveyor apparatus suitable for conveying and processing flowable materials such as particulate materials and slurries, for example which, incorporates cleaning or scraping elements for dislodging the accumulation of materials from the surfaces of the helical flight. The apparatus comprises an elongated housing defining a conveying chamber in which a helical flight is rotatably supported formed with a central axially extending bore through at least a portion of the length thereof and a shaft slidably disposed in the bore and reciprocable and rotatable relative to the helical flight. A series of scraper elements are mounted on the shaft adjacent to the leading and trailing surfaces …