Authors

Abstract

In view of the low mechanical sowing rate of peanuts in China, the existing seeders have problems such as insufficient sowing accuracy and slow speed, with the core goal of improving sowing accuracy, a key component of the sowing integrated machine - the spoon-wheel type seed conveyor - is designed. Based on mechanical analysis, the key parameters of the U-shaped groove inclination Angle of the seed spoon being 26° and the side Angle not less than 50° were obtained. The discrete element simulation model of the seed seeder was established by using EDEM software. Taking the rotational speed of the seed seeder, the side Angle of the seed spoon, and the top width of the seed spoon as the experimental factors, and the replay rate and missed broadcast rate as the indicators, single-factor and three-factor three-level orthogonal experiments were carried out, and the parameters were optimized through the response surface method. The results show that the optimal parameter combination is the side Angle of the seed spoon 54°, the rotational speed of the seed spoon wheel 20r/min, and the width of the top surface of the seed spoon 11.9mm. At this time, the replay rate is 5.19% and the missed broadcast rate is 5.43%, both of which meet the requirements of industry standards.

Abstract in Chinese

针对中国花生机械化播种率低、现有播种机存在播种精度不足、速率慢等问题，以提升播种精准度为核心目标，设计一款播种一体机的关键部件——勺轮式排种器。基于力学分析得出种勺U型凹槽倾角26°、侧面角度不小于50°的关键参数。利用EDEM软件建立排种器离散元仿真模型，以排种器转速、种勺侧面角度、种勺顶部宽度为试验因素，重播率和漏播率为指标，开展单因素及三因素三水平正交试验，通过响应面法优化参数。结果表明，最优参数组合为种勺侧面角度54°、种勺轮转速20r/min、种勺顶面宽度11.9mm，此时重播率为5.19%，漏播率为5.43%，均满足行业标准要求。