The Design and Experiment of Longitudinal Axial Flow Maize Threshing and Separating Device

Abstract. Aiming at the existing problems of high maize kernel damaged rate, low threshed rate and serious loss rate in the process of maize grain harvesting in China, a longitudinal axial flow maize threshing and separating device was designed and developed, which the components and parts can be changed easily, and it is also very convenient to adjust the structure parameters and the working parameters. In order to verify the working performance and threshing effect of the threshing and separating device, the maize threshing and separating experiments were carried out based on the self-developed test bench. In this paper, we take the maize kernel damaged rate, un-threshed rate as the performance indexes, and the threshing cylinder speed, threshing clearance and the feeding rate as the influence factors to carry out the three factors and three levels orthogonal experiments. The optimal parameters combination of the device was determined through the bench tests: The threshing cylinder speed was 350r/min, threshing clearance was 55mm, and the feed rate was 8kg/s, under the working conditions, the maize kernel damaged rate was 2.06%, and the un-threshed rate was 0.97%, it was meet the design requirement. The study of the device provides the reference for design and research of the longitudinal axial flow maize grain harvester.