GB110816A - Improvements in or relating to Grinding Mills and the like. - Google Patents

Abstract

110,816. Cloud, W. A. Nov. 23, 1916. Impact pulverizers.-Relates to mills of the kind in which a plurality of rotary disks carrying pulverizing-pins co-operate with other disks carrying similar pins. According to the invention, the rotatable disks are of increasing diameters in succeeding stages from the inlet to the outlet of the machine. In the form shown in Fig. 1, the rotatable disks a, a<1> carrying square pins b, b<1> are mounted in a stepped casing e. Cooperating pins c, c<1> are carried by a partition plate d and a cover-plate d<1> respectively. The material enters through a central orifice k and is drawn through the mill as indicated by the arrows. In the form shown in Fig. 3, the larger disk a forms the partition, the material passing through openings o near the middle. Air is drawn in with the material by the centrifugal action of the disks, so that the material is kept cool. The mills are suitable for pulverizing shellac, gums, resins, and like materials, which are detrimentally affected by heat. A fan may be used to increase further the air circulation. The distances of the disks from their co-operating disks decrease in successive stages. The distance between the pins on each disk is graduated, the pins being closer together at the periphery than at the middle. The pins may be otherwise than square, the angles being so arranged in relation to their paths as to cause the material to be deflected from one pin to another. The sides of the pins may be fluted.