Patent GB-149020-A (GB)
Title: Improvements in apparatus for separating and purifying wheat and other cereals and their products
IPC: B02B1/02
Filed: 1918-10-10
Abstract: 149,020. Higginbottom, J. Oct. 10, 1918. Reciprocating or oscillating sieves.-Apparatus for breaking or reducing and separating wheat, cereals &c. and their products comprises a framework 2 having therein a feed hopper 3 and breaking or reducing rolls 6 arranged to supply the broken material to the separating chamber 1. This chamber has two compartments, a head compartment having an upper part 11 and a lower part 12, and a tail compartment having an upper part 13 and a lower part 14. In the head compartment is placed a fan 15 delivering air through a fixed conduit 16 and a flexible conduit 18 to the lower head compartment, and in the tail compartment is a fan 33 delivering air through fixed and flexible conduits 34, 36 to the lower tail compartment 14. A frame supported by suspenders 29 is provided passing through both compartments, and is adapted to be reciprocated by eccentrics 31 and connecting-rods 30 and carries a head sieve 8 and a tail sieve 8A. A vibrating tray of nozzles 813, 8C as described in Specification 14711/88 is fitted to pass through both compartments, and communication between the upper and tail sieves and trays is established bv means of channels 19A, 19B in conduits 19, 20 fixed to and moving with the sieves and connected to the flexible conduits 18, 36. Conveying worms 26, 26A, 40 are provided for removing the material from the various collecting chambers. At the end of the tail tray of nozzles, aspirating nozzles 44 are provided, and at this end of the separating chamber, chambers 9, 24 are provided to receive material from the tray and from the sieve; the lower tail compartment 14 has therein a chamber 39 separated from the main compartment by a perforated diaphragm 42 adapted to distribute the air from the fan 33. In operation, material from the rolls passes on to the sieve. 8 through which an air current is passed by the fan 15. the velocity of the current being so adjusted by adjustment of a valve and of the speed of the fan that, in combination with the mesh of the sieve, none of the material passing over the sieve falls therethrough, whilst the heavy extractions are deposited on the vibrating tray of nozzles, and the lightest particles are carried through the fan and deposited in the compartment 12. The heavy material on the tray and the material on the sieve are carried forwards, bv means of the vibration, on to the tail tray and the tail sieve respectively, passing through the channel 19A, 19B. The tail sieve 8A has a mesh such that, together with the velocity of the air current, the material is allowed to fall into the compartment 14; the covering of the sieve is of variable mesh further to grade the material. The dust from the tail compartment passes through the fan into the chamber 39 and the overtails from the sieve as they fall into the chamber 9 are aspirated by a.n air current passing from the compartment 14 through the nozzles 44. Moisture and dust released during crushing by the rolls 6 are removed by air passing from the compartment 12 through the mill and through openings into compartment 11. In the drawings, the course of the material is indicated by full-line arrows and the course of the air by dotted-line arrows. According to the Provisional Specification, the separating apparatus may comprise one, two, or more compartments, and the vibrating trays may be replaced by stationary trays and brushes. Specification 14396/12 also is referred to.