PNEUMATIC CASCADE-GRAVITATIONAL CLASSIFIER Russian patent published in 2007 - IPC B07B4/02 

FIELD: mechanical engineering, in particular, pneumatic cascade-gravitational classifier which may be used in construction, mining-and-processing, chemical, metallurgical and other branches of industry for size separation of various bulk materials.

SUBSTANCE: classifier has classification shaft defined by outer and inner walls, slit-type opening provided through inner wall of said shaft, distribution apparatus formed as cone or disk positioned for rotation and equipped with drive, said distribution apparatus communicating with said slit-type opening, pipe for feeding of basic material to distribution apparatus, and branch pipe designed for discharge of air in conjunction with small-sized fraction and positioned in upper part of classifier. Outer and inner walls of classification shaft are made in the form of coaxial cylindrical surfaces. Intersperse shelves provided on wall surfaces within classification shaft are made in the form of side surface of truncated cone inclined downward in countercurrent direction with respect to air flow. Radii of outer and inner walls of classification shaft and radii of edges of intersperse shelves are correlated with one another by mathematical dependence.

EFFECT: increased efficiency in separation of materials and reduced labor intensity for manufacture of classifier.

4 dwg