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Design of an active seed throwing and cleaning unit for pneumatic rice seed metering device

International Journal of Agricultural and Biological Engineering 2018年第2期11卷 62-69页

作者： He Xing Zaiman Wang Xiwen Luo Ying Zang Wenwu Yang Minghua Zhang Yuexin Ma Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of EducationSouth China Agricultural UniversityGuangzhou 510642China College of Engineering South China Agricultural UniversityGuangzhou 510642China

To address the clogging of the rice seed metering device after a long period of operation without affecting the precision of normal seeding,an active seed throwing and cleaning unit was designed based on the fact that magnets of the same pole were mutually *** working principle of the two devices was analysed theoretically,and a mechanical model was created according to the relationship between the repulsion forces of magnets and the spring forces of *** super hybrid rice Y-2 You 900 with 22.5%moisture content(wet basis)was used as the test *** whole factor experiments were carried out under different negative pressures,rotational speeds of the suction plates,and lengths of *** results indicated that under any test conditions,the active seed throwing and cleaning unit worked *** results of high-speed photography showed that the rate of seed cleaning was 100%.The results also showed that the optimal negative pressure was 0.8 *** probability of 1-3 seeds per hill for the seed metering device was approximately 95%under the optimal negative *** optimal length of the probe was found to be 2 *** average qualified rate of hill space was 96.04%under the optimal length of probe,the longer the length of the probe,the lower the qualified rate of hill *** also showed that an active seed throwing and cleaning unit could effectively avoid the hole clogging caused by the long-term operation and had no influence on the normal operation of the pneumatic rice seed metering *** active seed throwing and cleaning unit improved the stability of the seed metering device,and the research provided a reference for the optimal design of seed throwing and cleaning structures of the pneumatic rice seed metering device.

关键词： agricultural machinery seed metering device seed cleaning anti-clogging pneumatic seed metering precision seeder

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