GB1306775A - Device for crushing hard materials - Google Patents

Abstract

1306775 Disc mills PROEKTNY INSTITUT ESTONSKOGO RESPUBLIKANSKOGO SOVETA MEZHKOLKHOZNYKH STROITELNYKH ORGANIZATSY 26 April 1971 11435/71 Heading B2H A mill comprises coaxial contra-rotatable discs 3, 4, Fig. 1, bearing vanes on their opposed working faces the vanes extending from the centre to the periphery. An imaginary line passing through an inner and an outer end of any vane in the plane of the disc, forms an angle greater than 90‹ with the linear velocity vectoring a point on the outer end of the vane. As described, the vanes may be curved, with short and long vanes 5, 6, Fig. 2, and baffles 7, and the leading surfaces of the vanes may be curved in section, concave at the ends, Fig. 7, and convex at the middle, Fig. 8. The vanes may be zig-zag in shape, Figs. 5 and 6, or may have a logarithmic curvature. In operation, material, e.g. sand, is fed in at 12 and impelled by members 13 along paths where it is struck successively by opposed vanes, towards the periphery of the discs, whence it is discharged. Crushed particles form a protective layer 14 over the vanes.