Authors

Abstract

The capability of existing precision seeding for soybean narrow row seeder is limited, to address these limitations; we designed a seed metering device. In this study, the structure and working principle of a precision seed metering device was analyzed, and the structural parameters of the seed counterbore seeding wheel for the seed metering device was designed and optimized. Field tests were carried out with the working speed, forward speed, and inclined angle as test factors, and the seeding qualified index and variation coefficient of uniformity as test indexes. The results showed that: the influence order of the factors affecting on the seeding qualified index, from high to low, was found to the working speed, inclined angle and forward speed. For the variation coefficient of uniformity, the influence order, from high to low, was as follows: the working speed, forward speed and inclined angle. Based on the optimization analysis performed using the Design Expert 8.0.6, it is concluded that when the working speed, forward speed, and inclined angle are 36.50 r/min, 1.47 m/s, and 4.11°, respectively, the seeding performance was optimal. The seeding qualified index and variation coefficient of uniformity were 90.37% and 12.87%, respectively, to reach the national seeding standard grade. This study provides a research basis and technical reference for the design and development of precision seed devices.

Abstract in Chinese

为提高大豆窄行播种机精密播种作业功能，设计了一种精密排种器，分析了精密排种器结构及工作原理，并设计了排种器的排种轮容种型孔结构参数。以排种器工作转速、机具前进速度和排种倾角为试验因素，播种粒距合格指数、重播指数、漏播指数和变异系数为试验指标，进行田间性能试验。结果表明：各因素对粒距合格指数的影响大小顺序均为：工作转速、排种倾角、前进速度。对变异系数的影响大小顺序为：工作转速、前进速度、排种倾角。运用Design-Expert 8.0.6软件进行优化分析，得出工作转速为36.50r/min，前进速度为1.47m/s，排种倾角为4.11°时，播种作业性能达最优状态，合格指数和变异系数分别为90.37%和12.87%，达到国家播种优等品要求。该研究为精密播种技术和播种装置的设计研发提供了研究基础与技术参考。