水稻横轴流双滚筒脱粒装置参数优化设计OA

The threshing device is a critical component of a rice combine harvester,directly affecting harvesting efficiency,energy consumption,and grain quality.To address the problems of low operating efficiency,high power consumption,and excessive stalk impurities in the threshing mixture,a transverse axial-flow double-drum threshing and separation device was designed and systematically evaluated through numerical simulation and experimental analysis.Based on the mechanical analysis of the threshing and separation process,a discrete element method model was established to investigate the effects of key operating parameters on device performance.Single-factor experiments were first conducted to analyze the influence of feed rate,drum rotational speed,and threshing clearance on impurity rate and power consumption.The results indicated that feed rate was positively correlated with both impurity rate and power consumption.As the drum rotational speed increased,the impurity rate initially decreased and then increased,while power consumption gradually decreased.In contrast,threshing clearance exhibited a negative correlation with both impurity rate and power consumption.Subsequently,feed rate,drum rotational speed,and threshing clearance were selected as experimental factors,with impurity rate serving as the evaluation index.A response surface methodology was employed to optimize the operating parameters of the threshing device.The results showed that relative influence of the factors on impurity rate,in descending order,was drum rotational speed,feed rate,and threshing clearance.The optimal operating parameters were determined to be a feed rate of 0.92 kg/s,a drum rotational speed of 730 r/min,and a threshing clearance of 29 mm.Under these conditions,the predicted minimum impurity rate was 10.78%,with a deviation of less than 5%from the experimental validation results.The findings demonstrate that the proposed transverse axial-flow double-drum threshing device can effectively improve threshing performance while reducing impurity levels.This study provides a theoretical basis and technical reference for the design optimization and performance enhancement of rice threshing systems.