GB1238824A - - Google Patents

Abstract

1,238,824. Grain cleaners. CLAAS GEB. 26 May, 1970 [29 May, 1969], No. 25186/70. Heading A1F. The cleaner for a combine harvester operates by drawing air in from outside the harvester through an intake opening 12, located below the screens 8, 10, which occupies the entire width of the screen casing 9. The casing 9 form with cleaner casing 7 an enclosed channel along which the air passes through the oscillating screens 8, 10 and the separated chaff is sucked out through suction air blowers 11 preferably axially constructed. The blowers or fans 11 are located at the rear of the combine, are effective over the whole width of the screens, and the chaff is expelled into the atmosphere via ducts 22 (Fig. 4). More suction channels may be connected to the casing 9 each having a control flap to shut off the channel if required and these channels are used to extract dust and the like from other parts of the harvester. In operation the grain/chaff mixture passes through the concave 4 on to oscillated grain pan 5, which conveys the mix to the first or only screen 8. Any grain from the straw walkers 6 falls directly on to grain pan 5 or slides thereto down cleaner casing 7. Cleaned grain falls into one of the augers below the screens and the tailings and heavy ears into the other auger to be returned to the threshing mechanism. An arrangement of the blowers 11, is shown as viewed from the rear (Fig. 4) with the ducts 22 outside the harvester. In other embodiments the ducts 22 and blowers 11 are closer together and inside the harvester, or a single duct is positioned between the blowers which extract from the outerside inwards.