GB226888A - Improvements in pulverizing, shredding and like machines - Google Patents

Abstract

226,888. Tugwood, R. J., (Jeffrey Manufacturing Co.). Oct. 3, 1923. Impact pulverizers.- In a pulverizing, shredding, or like machine in which a rotor operates in a casing having a screen composed of spaced bars, the bars are of uniform length and a spacer is arranged between each bar and its neighbour, the spacers being constructed so as to be engaged and retained by the ends of the bars. The casing is formed integrally with inwardlyprojecting flanges constituting supports for the ends of the bars and the spacers. The grating may be formed as a semi-cylindrical section rigidly attached to the casing, but is preferably formed in two parts, Figs. 1, 3, and 4, one part 8 being rigidly attached to the casing 2 and the other part 9 pivtally supported upon a crossshaft 10 and adapted to be swung downwardly to permit the escape of unpulverizable material. In the section 8, the ends of the grate bans 11 are supported upon the flanges 12 on the end walls 13 of the casing and the bars 11 are clamped between an abutment bar 15, which is supported in apertures 16 in the walls 13, and the clamping-bar 17 which projects through apertures 18 of the walls 13 and is engaged by screws 19 threaded in lugs 20 of the casing. The swing- ing section 19 comprises a supporting frame composed of side bars 21, end bar 22, and the supporting shaft 10. The frame is held in position by a toggle mechanism comprising a shaft 23 journaled in apertures of the casing, and arms 24 on the shaft connected by links 25 to lugs 26 on the bars 21. A stop 28 limits the upward movement of the links 25, and the shaft 23 is provided with an operating lever 27 carrying a counterweight 29. The ends of the grate bars 30 are supported upon the flanges 31 of the bars 21, and the bars 30 are clamped in place between the end bar 22 and the top grate-bar 32 which, when the section 9 is in operative position, is pressed against the abutment bar 33. The bar 33 has apertures 34 to engage pins 35 on the bars 21, and projects through apertures 36 of the end walls 13 and is engaged 'by adjusting- screws 37 threaded in lugs 38 on the walls 13. Cover-plates 39 prevent the escape of material through the apertures 16, 18, 36. The spacing blocks 14 are of substantially segmental shape and rest directly upon the flanges 12, 31 while their lateral flanges 140 engage the ends of the bars 11, 30. Projections 40 on the blocks 14 extend between adjacent grate-bars to hold them in spaced relation. The rotor comprises a number of discs 5 secured in spaced relation on the shaft 1 and having aligned apertures through which extend the pivot rods 6 of the beater-arms 7. In a modification, Figs. 8 and 9, for shredding fibrous materials, the grate-bars 41 are of equilateral triangular cross-section, and the spacing-blocks 42 are cut away or recessed to provide surfaces for engaging the ends of the bars and projections 43 having inclined surfaces 44 to fit the sides and tops of the bars. Specification 226,889 is referred to.