Authors

Abstract

In order to find out the influence rule of threshing system parameters on threshing effect and the optimal parameter combination, the cylinder-concave clearance adjustment device is realized by "Front and back two hydraulic cylinders + Slide rail", the deflector angle adjustment device is realized by "Hydraulic cylinder driving hinge rotation" and the threshing separation device inclination angle adjustment device is realized by "Front adjustable double head pull rod". Multi-objective optimization test was carried out. The experimental results showed that the significant order of the influence of various factors on the grain breakage rate was rotational speed of roller, threshing separation device inclination angle, feeding rate, deflector angle and cylinder-concave clearance. The order of significance of the influence on uncleaned material rate was rotational speed of roller, cylinder-concave clearance, deflector angle, threshing device angle and feeding rate. According to the multi-objective parameter optimization analysis, the optimal operation parameter combination of corn threshing was determined. Under this parameter combination condition, model verification test and field optimization test were carried out. Compared with the field test value after parameter optimization, the grain breakage rate decreased from 4.018% to 3.462%, and the uncleaned material rate decreased from 0.292% to 0.218%.

Abstract in Chinese

为寻求脱粒系统参数对脱粒效果的影响规律及最优参数组合，设计了前后两油缸加滑轨的脱粒间隙调节装置、油缸伸缩带动合页转动的导流板角度调节装置以及前端可调节双头拉杆的脱粒分离装置倾角调节装置。进行多目标优化试验。试验结果表明：各因素对籽粒破碎率影响的显著性大小顺序为滚筒转速、脱粒分离装置倾角、喂入量、导流板角度及脱粒间隙；对未脱净率影响的显著性大小顺序为滚筒转速、脱粒间隙、导流板角度、脱粒分离装置倾角及喂入量。通过多目标参数优化分析，确定装置进行玉米脱粒的最优作业参数组合,在该参数组合条件下进行了模型验证试验以及田间优化试验，参数优化前与参数优化后田间试验值相比，籽粒破碎率由4.018%降为3.462%，未脱净率由0.292%降为0.218%。