| 摘要 |
A self-propelled axial flow rotary combine includes a generally fore-and-aft disposed separator including a separating rotor surrounded by a cylindrical grate. A forward-mounted header gathers crop material from a field and feeds it to the space between the rotor and the grate for threshing and separation, straw being ejected from the rear of the separator and a portion of the crop material, including grain and chaff, passing through the grate and generally downwards to be intercepted by either a reciprocating grain pan under a forward portion of the separator or a reciprocating cleaning shoe immediately rearward of the grain pan and beneath a rearward portion of the separator. The grain pan is shaped so as to compensate for the laterally uneven distribution of the crop material as it passes downwards from the grate so that delivery of material from the rearward edge of the grain pan to the cleaner is distributed more uniformly across the width of the cleaner. Beneath the grain pan and forward of the cleaner is a blower assembly including four individually housed centrifugal blower wheels, each scrolled housing permitting axial flow of air into each wheel from both sides and centrifugal delivery over substantially the entire periphery of each wheel. The fan housings and ducts are arranged so that a portion of the air delivered by each blower wheel is delivered almost directly rearwardly and upwardly to the cleaning shoe while the remaining air portion is directed horizontally forward into a duct system extending across the width of the separator body and provided with deflectors for reversing the air flow so that it passes rearwardly above the grain pan and beneath and alongside the separator grate. The larger radius and greater depth of opposite reversing outer air flow deflectors compared with a center deflector results in an air flow pattern with respect to the grate having an inner shallower portion and outer portions of greater vertical extent. |
