Authors

Abstract

Aiming at the existing rice mechanized seeding technology it is difficult to meet the hybrid rice low seeding volume precision seeding requirements. In this paper, based on the friction characteristics of rice seed and the theory of silo arching, the structure and parameters of seed filling room with staggered oriented plates and vibration in the quantitative seed supply device were designed. EDEM software was used to simulate the working process of the quantitative seed supply device, and it was determined that staggered oriented plates structure in the seed filling room combined with vibration could effectively prevent seed arching, thus improving the uniformity of seed supply. Finally, the results of the simulation analysis were verified by rice quantitative seed supply test. The results showed that the vibration could increase the seed supply frequency by 3.64% for large sowing weight of conventional rice and 5.52% for small sowing weight of hybrid rice. In addition, the analysis of the coefficient of variation of the seed supply frequency by quantitative seed supply devices showed that the vibration effect could increase the stability of seed supply device by 2.47 % for the conventional rice seed and 1.33 % for the hybrid rice seed, which increased the seed supply stability.

Abstract in Chinese

针对现有的水稻机械化播种技术难以满足杂交稻低播量精密播种要求的问题，本文基于稻种摩擦特性及料仓结拱理论，设计了定量供种装置内交叉导流式振动种箱结构参数。采用 EDEM 软件对定量供种装置的工作过程进行了离散元仿真模拟，确定了种箱内交叉导流结构结合振动作用能够有效防止种子结拱，从而提高供种均匀性。通过水稻定量供种试验，对仿真分析结果进行验证，得到振动作用可提高常规稻大播量供种频率 3.64%，提高杂交稻低播量供种频率 5.52%；通过定量供种装置供种频率变异系数分析，表明振动作用在常规稻供种时可提高供种稳定性 2.47%，杂交稻提高 1.33%，增加了供种稳定性。