小型水稻联合收割机旋风分离清选试验

针对4LZ–0.8型小型水稻联合收割机在清选过程中存在的清选损失较大以及连续作业时湿物料易堵塞问题,对其分离清选装置进行了改进设计。改进后的装置由物料输送机构、扬谷器、旋风分离清选筒以及吸杂风机组成,去除了原有刮板抛送机构,在旋风分离筒中加装了半球体分离组件,改物料径向进入分离筒为切向进入。利用自制旋风分离清选试验台,以扬谷器转速、吸杂风机转速、分离组件距入口高度为试验因素,以谷粒清洁率和清选损失率为性能评价指标,运用回归分析方法建立了清选系统的数学模型,优化确定了最佳参数组合。试验结果表明:当扬谷器转速为1 133 r/min,吸杂风机转速为2 609 r/min,分离组件距入口高度为51 mm时,谷粒清洁率达到98.93%,清选损失率为0.035%。

Cyclone separating cleaning test for small-sized rice combine harvester

The separation device of 4LZ?0.8 small-sized harvester were developed to solve the problems of bigger cleaning loss and blocked by wet material. The developed device mainly consists of the material conveying mechanism, a winnower, the cyclone separation cleaning tube and the fan composition. The original scraper throwing mechanism is removed, and a hemisphere component separation was installed in the cyclone separation tube. The rice was feed into the cyclone separation tube along the radial direction instead of the tangential direction. By using the self-made cyclone separating cleaning tester, a mathematical model of the cleaning system was established by regression analysis using the winnower rotation rate, the suction fan speed and the distance between separating assembly and entrance as factors, and the grain clean-ratio and the cleaning loss as performance index. The combined kinematic parameters have been optimized. The results indicate that the grain clean-ratio of 98.93 % and the cleaning loss of 0.035 % could be achieved under the speed of 1 133 r/min, the suction fan speed of 2 609 r/min, and the height between separating assembly and entrance of 51 mm.