甘蔗收获机剥叶断尾系统的设计与转速优化.

As the most important procedures during sugarcane harvesting, leaves cleaning and tails severing are influenced by different growth height and lodging status, and the operating speeds of the rollers not only affect the operating efficiency of the sugarcane harvester, but also influence the quality of harvesting. In order to investigate the effect laws on the quality of peeling leaves and breaking tails of leaf-crushing impeller, leaf-cleaning impeller and tail wheel, the leaf-crushing and tail-breaking system was designed and manufactured for sugarcane harvester test bench after sugarcane harvesting. In the system, elastic wire springs were arranged uniformly on the leaf-crushing impellers, the outer edge of the leaf-cleaning impeller were installed with rubber plates, and the severing tail components on the tail wheels were elastic rib. As the test bench works, the rolling leaf-crushing impeller, leaf-cleaning impeller and tail wheel lacerated and peeled leaves attached tightly on the canes by producing centrifugal and frictional force. According to the mechanical properties that anti-deformation and impact resistance of the tails were significantly lower than other parts, the anti-float mechanism was designed for breaking tails, the groove of the circular arc can prevent the lateral movement and ensure the smooth transportation of the sugarcane. The experiments of peeling leaves and breaking tails of sugarcanes were conducted in Zhejiang University, 2015. A quadratic general rotary unitized design was carried out with leaf-crushing impeller speed, leaf-cleaning speed and tail wheel speed as experimental factors, and with non-cleaning rate, tail broken rate, skin broken rate and non-break rate as experiment indices. By using SAS 9.3 regression analysis method, response surface method and combined with nonlinear optimization calculation method, the working parameters were calculated optimally, and the optimal factor combination was established. The results indicated that, the tail-broken rate and skin broken rate were influenced by the speeds of the three impellers significantly, however, the non-break rate was influenced by the speed of tail wheel only, but it had no effect on the non-cleaning rate. The contribution rate order of non-cleaning rate was leaf-crushing impeller speed, leaf-cleaning speed and tail wheel speed. The contribution rate order of tail broken rate was tail wheel speed, leaf-crushing impeller speed and leaf-cleaning speed. The contribution rate order of skin broken rate was tail wheel speed, leaf-cleaning speed and leaf-crushing impeller speed. The contribution rate order of non-break rate was tail wheel speed, leaf-cleaning speed and leaf-crushing impeller speed. The optimum parameter combination of the test bench after optimization was 512.9 r/min of leaf-crushing impeller speed, 418.8 r/min of leaf-cleaning speed and 307.0 r/min of tail wheel speed. At this level, non-cleaning rate achieved theoretical optimum value of 4.98%, tail broken rate was 88.39%, skin broken rate was 5.19% and non-break rate was 96.21%.Verification experiment showed that the experimental value of non-cleaning rate was 4.86%, tail broken rate was 90%, skin broken rate was 4.78% and non-break rate was 97.5%, which indicated that the experimental values were consistent with predicted results, and regression models established by the experiment were appropriate, which can provide references to design whole-stalk sugarcane harvester and improve the harvesting quality. [ABSTRACT FROM AUTHOR]