Authors

Abstract

In order to improve air pressure utilization and working performance, the direct seed-metering device for rice was designed with spoiler blades embedded in the air cavity. The study was carried out using theoretical analysis and hydrodynamic methods to obtain the optimum structure of the spoiler blades. Taking the rotating speed of the air cavity, the negative pressure of the air cavity, and the filling height as the test factors, the multiple regression analysis and the response surface analysis were carried out to obtain the best working parameters of the seed-metering device with spoiler blades. The results showed that when the rotating speed of the air cavity was 23.56 r/min, the negative pressure of the air cavity was 4.97 kPa and the filling height was 12.82 cm, the qualified index was 95.21%, the missing index was 3.28% and the multiple index was 1.51%, which was the best seeding performance. Comparing the test with the seed-metering device without spoiler blades, the results showed that the installation of spoiler blades can improve the performance of the seed-metering device under the best working parameters. This study provide a reference for the design of direct seed-metering device for rice.

Abstract in Chinese

为提高气压利用率和工作性能，设计一种在气腔内嵌入扰流叶片的水稻直播排种器。采用理论分析与流体力学方法进行研究，获得了最佳扰流叶片结构。以气腔旋转速度、气腔负压真空度、填种高度为试验因素，进行多元回归分析和响应曲面分析，得到装扰流叶片排种器的最佳作业参数。结果表明当气腔旋转速度为23.56r/min，气腔负压大小为4.97kPa，填种高度为12.82cm时，合格率为95.21%，漏播率为3.28%，重播率为1.51%，排种性能最佳。在最佳工作参数条件下与未安装扰流叶片的排种器进行对比试验，结果表明安装扰流叶片能够提高排种器工作性能。本研究可为水稻直播排种器的设计提供参考。