Patent GB-191221069-A (GB)
Title: Improvements in Mills or Apparatus for Reducing Ore or other Material.
Inventor: RODGER ROBERT
IPC: B02C15/14
Filed: 1912-09-16
Granted: 1913-09-16
Abstract: 21,069. Rodger, R. Sept. 16. Edge - runners and pans and like mills.-In apparatus in which ore &c. is reduced by superimposed sets of rolls cooperating with corresponding plates or pans, the lower rolls 20, Fig. 1, revolve on a stationary plate 18, the upper rolls 54, 55 work on a rotating plate 44, which is keyed to a vertical shaft 1 and rests upon the lower rolls, and pressure is applied to the' rolls by means of fluid or springs, or both, acting on a plate 63 above the upper rolls. The plate 18 is formed in two or more segments bolted to a sole-plate 15. The inner ends of t h e spindles 21 of the lower rolls are pivoted to a spider 22 encircling the guide-bearings 17 of the shaft 1, and the outer ends engage in recesses in a cylindrical casing 24 which receives the crushed material fron the upper rolls and delivers it by shoots 26 to the lower rolls. A screen may be arrangec inside the revolving casing 24 to classify the crushed material fron t h e upper rolls. A cylindrical piece 25 pro tects the rolls &c. fron the inflowing material and distance - pieces 27 and collars 28 on the ends of the spindles hold the receiver 24 in posi tion. The rolls a r e fitted with peripheral scrapers carried by arms 32 fixed on the spindles 21. An inclined screen 34, fixed to a frame 35 and secured by wedges 40, surrounds the plate 18, and the receiving- chamber 33 is formed with an inclined bottom to lead the pulp to the outlet spout 43. The shaft 1 is driven by spur-wheels 13, 14 from a shaft 11 driven by bevel-wheels 9, 10 from the driving-shaft 4. The plate 15 carries a bearing for the upper end of the shaft 11, and step bearings 2, 12 are provided in the well 3 for the lower ends of the shafts 1, 11. The upper crushing-plate 44 has a ring 46 fitted to its underside to run in contact with the lower rolls. and carries crushing-rings 47, 48, the inner ring 47 having a fluted upper surface and being of greater thickness than the outer ring 48. The upper set of rolls comprises three outer rolls 54 and a single inner and smaller roll 55. The outer ends of the spindles 56 of the rolls engage in apertures in a ring 60, and the inner ends are pivoted to a spider 57 encircling the upper end of the shaft 1. The pressure-plate 63 has lugs 69 engaging vertical stays 68 carried by the plate 15, and is fitted on its underside with rings 64, which rest upon the rolls 54, 55. The lower end of the piston-rod 75 of the hydraulic cylinder 72 is rounded and seated within a recess 76 in a boss 70 on the plate 63. The cylinder 72 may communicate by an opening 85 with the lower end of a cylinder 80, which contains a floating piston 83 and is supplied with compressed air &c. by a pipe 81. The feed-hopper 86 carried by the plate 63 communicates with a cavity 87 in the boss 70, and the shoot 88 attached to the rotating spider 57 is fitted with a vertical grating through which small material passes to the outer plate 48, the coarse material passing through an opening in the shoot to the inner plate 47. Two of the upper rolls are provided with scrapers 57<a>, and the plate 47 is kept clean by a scraper pivoted to the spider 57. Fig. 9 shows spring means for applying pressure to the plate 63. A cavity 105 in the boss of the plate receives the spherical head 104 of a rod 100 carrying a disk 94 movable within a cylindrical guide 96, and springs 93 arranged between the disk 94 and an upper disk 95 are adjustable by means of a screw 97. The guide-plate 99 may be fixed, or movable with the rod 100 and acted upon by adjustable springs 101. Instead of, or in addition to, the springs 93, 101, adjustable springs 106 may be provided on the stays between the plate 63 and nuts 107. The plate 63 may be provided on the underside with lugs 108 to which are pivoted brackets 109 for carrying the rolls, so that the pressure is transmitted through the roll spindles. When two rolls only are employed in the upper set, the head of the rod 100 may be pivoted between lugs on the boss so that the pressure-plate can move in the plane of the axes of the rolls. Fig. 11 shows a modification in which a hopper 111 feeds the material to four shoots 113, and the upper rolls are provided with curved peripheries and tyres and work in a groove in the top plate 114, which carries a screen 115. Chains 121 connect the spindles 120 of the upper rolls with the stays 122 to prevent the rolls from rotating round the shaft 1, and the lower rolls are carried by hangers secured to the underside of the plate 117. Pressure is applied to the spindles 120 by means of springs 124. In another modification, a piece 128, Fig. 12, on the end of the roll spindle 133 is acted upon by springs 130 surrounding bolts 127, which are fixed to a top plate and pass through holes in the piece 128. For adjusting the several rolls of the same set so that they operate normally in the same plane, the ends of the spindles may run in blocks adjustable vertically in guides on the plate above. The rolls may have plain, fluted, corrugated, serrated, or grooved peripheries. When used for dry grinding, a current of air is circulated through the machine.