Authors

Abstract

The working quality of a cotton stripper harvester is limited by the efficiency of onboard seed cotton cleaners. As a basis for research in the design of a cotton stripper harvester prototype, the bench cleaning tests were designed to study the effect of structural and technological parameters on the loss rate and impurities rate of the cleaner. According to the features of different test factors, a combined orthogonal test was applied to determine the best combination of the sawtooth distance, saw cylinder diameter, and cleaning distance. With these parameters fixed, the optimal parameters for the cleaning distance, saw cylinder rotating speed, and brush thickness were obtained using a quadratic-regression rotatable orthogonal test. The best parameter configuration to ensure the cleaning quality of the onboard seed cotton pre-cleaner included the following structural parameters: sawtooth distance of 38 mm and saw cylinder diameter of 340 mm, and technological parameters: rotating speed of 282–288 rpm, clearance of 12.55–14.84 mm, and brush thickness of 8.37–9.69 mm, which decreased the loss rate to less than 10% and the impurities rate to less than 6%. The reliability of the theoretical analysis results was verified by a comparison with experimental results. The experimental results provide a theoretical basis and technical reference for the research and the structural design of seed cotton pre-cleaners.

Abstract in English

针对统收式采棉机作业质量受限于机采籽棉预处理装置清理效率的问题，设计机采籽棉预处理清理作业试验台架。以含杂籽棉为研究对象，研究籽棉清理过程中锯齿间距、锯齿辊直径、锯齿辊转速、排杂棒间距、毛刷厚度等因子对损失率，含杂率的影响，并进行优化分析，确定清理单元结构及工艺的最优组合参数。根据试验因素特点，采用响应面优化设计试验，得到锯齿间距、锯齿辊直径、锯齿辊转速、排杂棒间距的最优参数组合。结果表明：锯齿间距38mm，锯齿辊直径340mm时，最优参数组合为锯齿辊转速282-288rpm，排杂棒间距12.55-14.84mm，毛刷厚度8.37-9.69mm，机载籽棉预处理机清选损失率降至10%以下，含杂率低于6%。通过试验验证结果可信，可为机采籽棉预处理装置相关研究和结构设计提供理论依据。