Authors

Abstract

As the core part of precision seeder, the performance of pickup finger seed metering device directly affects the seeding quality. Aiming at the problem that the traditional pickup finger seed metering device can be easily affected by the performance of spring material, and the reliability of spring decreases with the increase of service time, a magnetic pickup finger seed metering device is designed to open and close the pickup finger by magnetic force, so as to improve the stability of seed metering performance. Through the design and optimization of permanent magnet structure, cam structure and seed taking pickup finger structure, the magnetic force distribution of ring magnet is analysed by using ANSYS Maxwell magnetic simulation software. Under the working speed of 3.9km/h, the vibration frequency, vibration amplitude and magnetic induction intensity were selected for orthogonal test. The experimental results show that the optimal combination of factors is vibration frequency 6Hz, vibration amplitude 3.1mm and magnetic induction intensity 316.34mT. Under the condition of the combination of operation parameters, the seed arrangement performance is 91.7% of the qualified rate, 6.2% of the replant rate and 2.1% of the missed rate, which meets the requirements of the national standard for the performance of the seeder. This study can provide a reference for the optimization of the structure and the improvement of the seed metering performance of the pickup finger seed metering device.

Abstract in Chinese

指夹式排种器作为精密播种机核心工作部件，其性能直接影响播种质量。针对传统指夹式排种器易受弹簧材料性能影响，随使用时间增加排种性能下降的问题，设计一种由磁力完成指夹开启与闭合的磁力指夹式排种器，提高指夹式排种器排种性能稳定性。通过设计优化永磁体结构、凸轮结构及取种指夹结构，应用Ansys-Maxwell磁力仿真软件分析环形磁铁磁力分布；在作业速度3.9km/h条件下，选取振动频率、振动幅值、磁感应强度3因素进行正交试验。试验结果表明：较优因素水平组合为振动频率6Hz、振动幅值3.1mm、磁感应强度316.34mT；该组合作业参数条件下，排种合格率91.7%、重播率6.2%、漏播率2.1%，满足国家标准对精密播种机性能要求。该研究可为指夹式排种器结构优化与排种性能提高提供参考。