Forschungsbericht Agrartechnik des Fachausschusses Forschung und Lehre der Max-Eyth-Gesellschaft Agrartechnik im VDI (VDI-MEG)

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Einfluss der Hangneigung auf die Leistungsfähigkeit von Reinigungsanlagen im Mähdrescher
(2011) Fliege, Lars; Böttinger, Stefan
The performance of a combine harvester is determined by the maximum throughput at acceptable grain losses. At optimum throughput, the cleaning system reacts very sensitively to variations of the gradient, whereby the influence of lateral inclination is much higher than the influence of longitudinal inclination. The grain losses increase when the inclination of the cleaning unit is suboptimal. The performance of the combine harvester is then determined by the performance of the cleaning devices. Combine harvesters with hillside levelling systems solve that problem with their special chassis. Independent of the gradient these chassis hold the complete combine in a level position. Other hillside adapted cleaning systems are less effective and reach their limits already at medium gradients. The presented paper analyses the influence of gradients up to 15% on the performance of cleaning units with lateral hillside modulation. For this purpose several combines of equal type of construction have been analysed in different crops using large-scale parcel tests. The deployed measurement instrumentation corresponds to the series-production status of the combine harvesters. Various testing conditions and systematic errors make the handling of the collected data very complex. However, it enables the evaluation of the measurement characteristics of different sensors at variable gradient. The results, between the several test combines, indicate specific differences, caused by disparities in the level of development of the individual machines. Previous analyses of the influence of hillside are limited to throughputs of at most 4.8 kg/s per meter cleaning width. The tested combines achieved more than 9.4 kg/s per meter cleaning width in large-scale parcel tests. This result is a combine specific throughput of more than 55 t/h. The results display a possible triplication of cleaning losses in different throughput ranges between 15 t/h and 55 t/h already at a lateral inclination of 10%. The influence of longitudinal inclination is marginal. The analysis of overlaid lateral and longitudinal inclination demonstrates the significant influence of lateral inclination compared to longitudinal inclination.

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