Patent GB-365597-A (GB)
Title: Improvements in hammer pulverisers
IPC: B02C13/00
Filed: 1930-10-17
Abstract: 365,597. Impact pulverizers ; pneumatic separating ; furnace feeding. COMPAGNIE FRANÃAISE BUELL COMBUSTION, 63, Avenue des Champs ElysÚes, Paris. Oct. 17, 1930, No. 31141. Convention date, July 10. [Classes 59 and 117.] In a pulverizer for crushing coal in which paddles or beaters are fixed to a rotating disc, the paddles 7, which may be inclined, Figs. 6 and 7, are fixed between branches 49 of intermediate supports provided with projections 48 which engage in a groove 47 in the periphery of the disc 6 and each of which is fixed in the groove by a pin 50 the ends of which are flush with the sides of the disc. Spacing blocks 54 in the grooves separate the paddle supports and the paddles are secured in the supports by bolts 52, the branches 49 being protected, in the direction of movement of the disc, by a cap 53, or a casing 54a may protect both the branches 49 and securing bolts. The Specification also describes beaters 7, Figs. 1 and 2, mounted on lugs 8 having welded plates of carrying tenons 10 extending into mortises in the disc. The plate 9 carries a boss 11 which enters a recess in the beater 7 and a bolt 12 secures the beater to the lug. The material is fed into the bottom or side of the mill by a screw or other conveyer 18 such that tramp iron &c. is discharged into a chamber 21. The disc 6 is secured to a flanged boss 13, Fig. 1, of a driving shaft 1 by a breaking bolt 15 which enters an eccentric hole in a bush 16 movably mounted in the flange. Hot or cold air or gas is admitted through a casing 24 to lateral side chambers 23 which communicate with the centre of the disc and an adjustable opening 44 is provided for admitting extra air when the beaters become worn. The coal &c. is thrown up by the beaters into a duct 25 and is carried by the air into a classifying chamber 36 in a sheet-like film between pivoted louvres 28, 29 and a vertically sliding nozzle 30. The coal dust &c. impacts on a plate 34 and is deflected downwardly by lateral adjustable angle-plates 35. The coarse coal is collected in a receptacle 37 and is discharged through orifices 39 back to the mill through an adjustable opening 42. A pivoted plate may be inserted in the conduit 25 which deflects that part of the upward current, containing air and dust, into a separate channel communicating with lower part of the casing. Equal or symmetrical feeding of coal dust to the burners may be arranged through a series of separate pipes 63, 61, communicating with the top of the chamber 36, Fig. 4, or the discharge conduit 46 may connect up with a distributing box to which the pipes are connected. When the delivery pressure at the outlet of the separator is insufficient an auxiliary fan may be used to deliver cold or hot air through a nozzle into the separator. The feed hopper may be provided with a jacket for the circulation of hot gases and the material may be fed from the hopper by a reciprocating tray and an adjustable flap which scrapes the material from the tray. The joint between the hopper and crushing chamber may be supplied with air from a fan or be connected to the suction of the gas supply conduits leading to the crushing chamber. The crushing chamber may be lined with hardened steel plates which may be mounted to provide recesses in which the ground material adheres and forms the grinding surface.