GRAIN CLEANING SYSTEM HAVING IMPROVED AIR FLOW AND ADDITIONAL FALL STEP TO IMPROVE GRAIN CLEANING PERFORMANCE

摘要

An agricultural harvester (10) includes a chassis (12), a threshing and separating system (24) for separating grain from MOG, and a grain cleaning system (26) for further separating grain from residual MOG. The grain cleaning system (26) has a main grain pan (44), an intermediate grain pan (102) located beneath and rearward of the main grain pan (44), and at least one sieve (46, 48, 50) located beneath and rearward of the intermediate grain pan (102). The main grain pan (44), the intermediate grain pan (102), and the at least one sieve (46, 48, 50) are so arranged that the mixture of grain and residual MOG undergoes a first fall step (100) from the main grain pan (44) to the intermediate grain pan (102), and a second fall step (104) from the intermediate grain pan (102) to the at least one sieve (46, 48, 50).