Patent GB-256562-A (GB)
Title: Improvements in or relating to pulverizers
IPC: B02C13/26
Filed: 1925-10-06
Abstract: 256,562. Syracuse Pulverizer Corporation, (Assignees of Briggs, A. J.). Aug. 8, 1925, [Convention date]. Impact pulverizers. - A pulverizer for coal &c. comprises a circular series of sets of swinging hammers for effecting the preliminary grinding, and a series of rings of teeth arranged co-axially around the hammers for puverizing the material to a fine powder. The rotor 3, Figs. 1 and- 2, carrying the swinging hammers or beaters 10 is driven by a shaft 9 and has a hub 4 mounted to rotate upon ball bearings 5 carried by a hollow shalt 6 formed upon a disc 7, which is bolted to the casing 1. The hammers are of rectangular shapa with rounded corners 11 and are carried by bolts 13 which pass through the hub 4, apertures 12 in the hammers, and front and rear rings 14, 15. Two apertures 12 are provided in each hammer so that, when one end of a hammer becomes worn, the hammer may be turned end for end. A ring grating 19, formed by spaced bars 20, surrounds the hammers, the bars being of keystone section with the inclined faces a of adjacent bars divergent so that the openings between the bars diverge outwards. The inner faces of the bars present sharp cutting-edges 22 to co-operate with the hammers in grinding the coal &c. The ring 19 is bolted to a ring 23 in turn bolted to the face of a cylindrical casing member 26, which is bolted to the part 28 of the casing 1. A series of annular sets of pulverizing-teeth 29, 30 are carried by a ring 31 bolted to the ring 23, the teeth 'being preferably of keystone section and tapered inwardly with their peripheries approximately parallel to the axis of the rotor while their inner faces 34 are inclined to the axis. Teeth 35. 36 formed upon a. ring 37 bolted to the rotor extend between and co-operate with the stationary teeth 29, 30. The teeth 35, 36 are preferably of keystone section and tapered in the reverse direction to the teeth 29, 30. The coal &c. is fed to the centre of the grinding-chamber by a spout 44, Fig. 6, which receives the coal from a hopper 46 by means of a rotating table 47 and a stationary scraper 48. The pulverized material passes from the chamber 54 into the chamber 55, which contains a fan formed by removable vanes 56 secured upon a flange or spider 57 of the rotor hub 4. Air is drawn in by the fan through a regulator 59. The adjustable means for regulating the supply of coal &c. and the means for regulating the supply of air are co-ordinated so that the adjustment of the coal-supplying means effects automatically a regulation of the air supply. The pivot-shaft of the arm 73 carrying the scraper 48 is connected by an adjustable rod 69 to an arm 70 on a rock-shaft 66 provided with a hand-lever 67. The shutter 79 of the air controller carries a slotted arm 78 connected bv an adjustable link 74 to a slotted arm 76 on the shaft 66. By means of the lever 67, the scraper 48 can be moved inwards or outwards of the rotating table 47 and simultaneously the shutter 79 is turned to open or close the air openings 83. The shaft 66 may be connected with suitable temperature-controlled devices located at the point of combustion for the purpose of automatically regulating the amount of fuel and air in accordance with the heat to be developed.