Authors

Abstract

In order to further improve the seeding performance of the maize seed-metering device, a pressure-holding precision seed-metering device for maize was designed. The seed-metering device is made up of several seed rowing modules, which effectively solves the problems of inconvenient disassembly and complex maintenance of the current maize seed-metering device. The working principle of the device was introduced, and the mechanical and kinematic analysis of the maize seeds during the seeding operation was carried out. The orthogonal test was carried out with the installation diameter of seed-metering device's guide plate, torsion spring's wire diameter and seed-metering device's rotational speed as the test factors, the single-seeding rate, missed-seeding rate and multiple-seeding rate as the indexes, and the relationship between different test factors on the performance of seed-metering device was obtained. By optimizing the model, the best performance of the seed-metering device was obtained when the installation diameter of the guide plate was 92.32 mm, the wire diameter of the torsion spring was 1.59 mm, and the rotational speed of the seed-metering device was 0.41 r/s. At this time, the single-seed rate was 93.08%, the missed-seeding rate was 3%, and the multiple-seeding rate was 3.9%, which met the requirements of the industry standard.

Abstract in Chinese

为了进一步提高玉米排种器的排种性能，设计了一种压持式玉米精量排种器。该排种器由多个排种模块组合而成，有效解决了目前玉米排种器存在的拆装不方便、维修复杂等问题。介绍了排种器的工作原理，对作业过程中的玉米种子进行了力学和运动学分析。以排种器导引板安装直径、扭簧丝径及排种器转速为试验因素，以单粒率、漏播率及多粒率为指标进行正交试验，得到了不同试验因素对排种器性能的影响关系。通过对模型进行优化，得到了当导引板安装直径为92.32mm、扭簧丝径为1.59mm、排种器转速为0.41r/s时，排种器工作性能最佳，此时的排种单粒率为93.08%、漏播率为3%、多粒率3.9%，满足行业标准要求。