GB1468662A - Improvements in or relating to crushing apparatus - Google Patents

Abstract

1468662 Roller and breast mills METAL BOX Ltd 25 June 1974 [17 May 1973] 23495/73 Heading B2A Apparatus comprising a rotor 17 Fig. 1 surrounded by a restrictor viz a curved plate 32 to define a gap of radial width decreasing in the direction of rotation means on the rotor to urge material to be crushed into the gap and a restrictor having a crushing surface formed with ratchet-like teeth presenting a sloping surface for waste material to move towards a narrower or outlet end of the gap between the restrictor and the rotor, a series of shoulders preventing waste material from moving backwards. As described, the means on the rotor comprises the projections or pins 26 are in four sets with the leading face of each pin of larger diameter than the trailing face, Fig. 3. The plate 32 is pivoted at 33 has teeth 36, is biassed by springs 39 to permit yielding under overload, and has three grooves 41 to permit passage of the pins therethrough. A grooved backing block 29 is also provided. Comminuted material falls into a lined drawer 50, and waste to be comminuted is fed into a chute 46. Various arrangements of pins, are described viz:- offset Fig. 5, not shown; helical Fig. 7 (not shown); in V-shaped formation; and in any number; of unequal lengths, or different lengths; of square or rectangular cross-section; with flat leading edges, or of T-shape Fig. 13. The springs 39 may be releasable to remove obstructions and may be adjustable in pressure and the drive motor (23) Fig. 2, not shown, may be reversible. The springs 39 may be replaced by fluid-actuated resilient devices, e.g. an hydraulic ram controlled electrically in response to motor-overload current. The drawer 50 and chute 46 actuate microswitches to prevent motor operation when the drawer and chute are open.