GB191006464A - Improvements in Combined Ball and Tube Mills. - Google Patents

Abstract

6464. Kennedy, J. E. March 15. Ball and like mills.-A combined ball and tube mill for comminuting ore, cements, &c. has the casing or tube 3, Fig. 1 divided into two compartments by a perforated screen 30, and is fed at either or both ends and discharged at one end. The casing 3 is closed at the ends by heads 5, 6 which are bolted to circular anglebars 8, 9 secured to the ends of the casing, and the heads have outwardly - extending hollow trunnions 11, 12 supported in bearings 13, 14 on supports 15, 16. A rotary feed-wheel 20 with radiating flanges feeds the ore &c. from the hopper 19 into a pipe 18 fitting into the trunnion 11, and an internal spiral flange 29 on the trunnion feeds it into the mill. Bosses 21 on the sides of the wheel 20 engage flanges 22 on the hopper and prevent any material from passing down at the sides of the wheel. The screen partition 30 tapers from the centre to the periphery, and is secured to the casing by bolts 32 which pass through the flange 31 and are covered by protecting - pieces 33. The division of the casing towards the head 5 is lined with corrugated manganese-steel plates and charged with balls 43. The lining-plates 34, Fig. 2, have flanges 36 which engage the sides of longitudinal beams 35 placed between the casing and the plates 34, and the heads of the securing-bolts 37 fit in grooves in the flanges 36. To permit the last plate to be inserted, one of the junctions between the plates 34 is formed of two wedge-shaped parts 40, 41 having a junction directly over the centre of the fastening-bolt 42, the head of which extends into grooves in the sides of the parts 40, 41. The crushed material passes from the ball mill through the screen 30 into the tube mill which is lined with silica or hard quartz and charged with flint pebbles 44. Segmental screens 47 which extend from the casing 3 to a conical feed-head 48 are secured to radially-extending partitions spaced from the head 6 of the tube mill by distance-pieces 45 carried by bolts 46. Spiral flanges 49 on the outside of the head 48 direct the ore that passes through the screens 47 into the hollow trunnion 12 which leads it into a screen 50. The material passing through the screen 50 is received in a hopper 51 and the tailings are discharged by a pipe 54. Lumps of ore or flint pebbles are fed into the tube mill by a feed-pipe 55, which has an internal spiral flange 56, and extends from the head 48 through the screen 50 and out beyond the pipe 54.