Patent GB-204250-A (GB)
Title: Disintegrating or pulverizing apparatus
IPC: B02C17/00
Filed: 1922-12-18
Abstract: 204,250. Kennedy, J. E. Dec. 18, 1922. Ball and like mills.-Relates to apparatus for disintegrating or pulverizing coal, ore, rock, bone, &c. and of the kind in which a revolving cylindrical drum has grinding-means therein to disintegrate the material, the material being fed through one of the hollow supporting-trunnions of the drum and the disintegrated material being withdrawn through the other hollow trunnion by suction and delivered to a separator from which the coarse particles are returned to the drum for re-grinding. The drum D, Figs. 1 and 2, is supported by its hollow trunnions 4, 5 in bearings 6, 7 and may carry an annular gear 8 meshing with a pinion 8' on the driving-shaft 9<1>. The trunnions, which are integral with the ends of the drum and are of large diameter relative to the drum, are fitted with reducers comprising annular plate-portions 9 whereby they are detachably connected to the ends of the trunnions and inwardlydiverging webs 10. The fan F is connected at 15 to a receptacle 14 which has an air-tight connection with the delivery trunnion 5 of the drum, an axial extension 16 of the plate 9 having a sliding joint connection with a flange 17 extending around the inlet of the casing 14. A flanged collar 18 is forced against the flange 17 by springs 22 on pins 20 slidably engaging in lugs 21 on the sleeve 16. The delivery pipe 23 of the fan is connected to a separator S adjacent to the top thereof, and a pipe 24 returns the separated material to the drum. A pipe 25 leads from the top of the separator to a closed receiver 26 for the collection of the pulverized material carried by the air, whence it passes by an adjustable shoot 19 to one or more bins 27. The return-air pipe 28 leads from the top of the receiver 26 to a casing 29 having an air-tight connection with the feed-trunnion 4 similar to that between the trunnion 5 and casing 14. The material to be disintegrated passes from the hopper by a shoot 31 into a charging-shoot 37 through which it is fed by a plunger 41 reciprocated by a rod 44 and eccentric 42 on a shaft 43. One or more air-inlets with adjustable gates 46, 47 are provided on the casings 29, 14 respectively. The drum may be divided by one or more perforated partitions 48 into compartments 49, 50 charged with grinding-balls of different sizes. The perforations 52 in the partition 48 increase in size from the chamber 49 to the chamber 50, and the partition has a central opening 53 provided with deflectors 54, 55 to prevent the grinding-elements from passing from one chamber into the other. A shoot 56 extending through the casing 14 and having a removable closure 40 at the top is provided for feeding the grinding-elements into the chamber 50. The outlet pipe 25 of the cyclone separator S has an adjustable tubular extension 57, Fig. 4, for regulating the fineness of the material deposited in the separator. The pipe 57 is carried by rods 58 passing up through the top wall of the separator and provided with nuts 60. To reduce the force of the air returned to the drum by the pipe 28, an auxiliary separator 61 with an inlet pipe 62 from the pipe 28 and an outlet pipe 63 to the atmosphere at the top is provided; any material separated in the separator 61 passes by a pipe 64 to the bins 27. In a modification, Fig. 7, separators 61a, 64a, of increasing size for grading the pulverized material, are arranged in series between the delivery pipe 23 and the return pipe 28, and any one or all of these separators may be fitted with the adjustable telescopic extension of the outlet pipe shown in Fig. 4.