Abstract: Aiming at the problems of seed channel opener for peanut seeder such as instability of seed channel shape and large traction resistance due to high soil moisture content in hilly areas in Southern China, a seed channel opener for peanut seeder suitable for soil in southern China was designed. Combined with the parameters of the soil model in Southern China, the operation parameters of the seed channel opener were optimized by discrete element simulation and soil groove test. The model of soil and the seed channel opener were established using EDEM platform. Taking opening depth of seed channel opener, angle between wings and soil entry angle as test factors, and the channel shape coefficient and traction resistance as evaluation indexes, combined with response surface method, Box-Behnken tests were carried out to study the influence rule of each factor and its interaction on the operation effect of the opener. The optimal parameter combination was determined as follows: opening depth of 40 mm, angle between wings of 98° and soil entry angle of 144°. Compared with the results of the simulation test and the soil groove test, the error of channel shape coefficient and traction resistance was 3.78% and 6.68%, respectively. Based on the combination of the optimal operating parameters, the channel shape coefficient of 1.02 and the traction resistance of 46.3 N were obtained in the soil groove test. This study improved the performance of the seed channel opener and provided  theoretical reference for the design of the seed channel opener for peanut seeder in the hilly areas of southern China.

Key words: peanut seeder, seed channel opener, design, optimization, EDEM simulation, experiment

摘要： 针对我国南方丘陵地区土壤含水率较高导致花生播种机开沟器的开沟沟型不稳定、牵引阻力大的问题，设计了一种适用于南方土壤的花生播种机种沟开沟器，并结合南方土壤模型参数，采用离散元仿真和土槽试验相结合的方法优化开沟器作业参数。利用EDEM平台搭建土壤与开沟器模型，以开沟深度、双翼夹角和入土角为试验因素，以沟型系数和牵引阻力为评价指标，结合响应面法进行Box-Behnken试验，研究各因素及其交互作用对开沟器作业效果的影响规律，并确定最优参数组合为：开沟深度40 mm、双翼夹角98°、入土角144°。对比仿真试验和土槽试验结果，沟型系数和牵引阻力的误差分别为3.78%和6.68%，基于最优作业参数组合得到土槽试验中沟型系数为1.02、牵引阻力为46.3 N。该研究提高了开沟器的作业性能，为南方丘陵地区花生播种机种沟开沟器设计提供理论参考。

关键词: 花生播种机, 种沟开沟器, 设计, 优化, EDEM仿真, 试验