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朱德泉,李兰兰,文世昌,张顺,蒋锐,武立权.滑片型孔轮式水稻精量排种器排种性能数值模拟与试验[J].农业工程学报,2018,34(21):17-26.DOI:10.11975/j.issn.1002-6819.2018.21.003
滑片型孔轮式水稻精量排种器排种性能数值模拟与试验
投稿时间:2018-04-10  修订日期:2018-08-29
中文关键词:  农业机械  数值模拟  农作物  水稻  排种器  排种性能  滑片型孔轮
基金项目:安徽省科技重大专项(17030701045);国家自然科学基金项目(51805005);安徽农业大学青年科学基金重点项目(2016ZR009)
作者单位
朱德泉 1. 安徽农业大学工学院合肥 230036 
李兰兰 1. 安徽农业大学工学院合肥 230036 
文世昌 1. 安徽农业大学工学院合肥 230036 
张顺 1. 安徽农业大学工学院合肥 230036 
蒋锐 1. 安徽农业大学工学院合肥 230036 
武立权 2. 安徽农业大学农学院合肥 230036 
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中文摘要:针对现有水稻旱直播机排种器适应性差和排种精度低的问题,该文设计了一种滑片型孔轮式排种器。引用球度表示水稻种子三轴尺寸,利用EDEM软件对3种球度水稻种子在6种排种轮转速下的排种器排种过程进行仿真试验,得到不同球度水稻种子在不同排种轮转速下的排种性能变化规律,分析了排种轮转速和种子球度对排种性能的影响。仿真结果表明:当排种轮转速在15~40 r/min时,冈优898种子的排种性能优于国丰一号种子和冈优3551种子的排种性能;当排种轮转速在15~30 r/min时,3种球度水稻种子的排种合格率在84.01%~87.91%之间;当排种轮转速大于30 r/min时,随着排种轮转速增加,排种合格率显著下降。在此基础上,选用不同球度的5个水稻品种种子为试验材料,选取排种轮转速和种子球度为试验因素,以排种合格率、漏播率和重播率为评价指标,采用二次回归正交旋转组合设计,进行排种器台架试验。利用Design-Expert 8.0.6软件对试验结果数据进行分析,建立排种性能指标与排种轮转速和种子球度之间的回归方程,得到响应面图,并对仿真结果进行验证。根据回归方程进行优化,得到最佳工作参数:排种轮转速为27.12 r/min、种子球度为44.61%,此时,排种合格率为83.90%、漏播率为5.43%、重播率为10.67%,排种性能最佳;排种器台架试验结果与仿真结果基本相同,排种性能随排种轮转速和种子球度的变化规律一致。田间试验结果表明,排种器对各尺寸等级水稻种子的排种性能皆满足水稻精量穴直播的播种要求。研究结果可为滑片型孔轮式精量排种器的结构优化及排种性能提升提供参考。
Zhu Dequan,Li Lanlan,Wen Shichang,Zhang Shun,Jiang Rui,Wu Liquan.Numerical simulation and experiment on seeding performance of slide hole-wheel precision seed-metering device for rice[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(21):17-26.DOI:10.11975/j.issn.1002-6819.2018.21.003
Numerical simulation and experiment on seeding performance of slide hole-wheel precision seed-metering device for rice
Author NameAffiliation
Zhu Dequan 1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
 
Li Lanlan 1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
 
Wen Shichang 1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
 
Zhang Shun 1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
 
Jiang Rui 1. School of Engineering, Anhui Agricultural University, Hefei 230036, China
 
Wu Liquan 2. School of Agriculture, Anhui Agricultural University, Hefei 230036, China 
Key words:agricultural machinery  numerical simulation  crops  rice  seed-metering device  seeding performance  slide hole-wheel
Abstract: Precision planting is the advanced technology that sows seeds in the predetermined position of soil accurately and quantitatively by precision planter. Precision seed-metering device is the key component of precision planter and its seeding performance directly affects the quality of rice sowing, which divided into two types according to the working principle. The one is the mechanical metering device, and the other type is the pneumatic seed-metering device. The hole-wheel precision seed-metering device is a kind of mechanical seed-metering device and its seed-filling performance directly affects the seeding quality, which has been increasingly widespread due to its advantages of high planting quality when sowing rice seeds. But it has disadvantages of bad uniformity not to meet the seeding requirement of different size rice seeds. There are many dry direct seeding varieties rice and the sizes of their seeds are different. The adaptability of the seed-metering device to different sizes rice seeds is different. High speed work will also have a great influence on the seed-filling of the seed-metering device. For the problems of poor adaptability and low precision of the current rice drought direct seeding machine, a slide hole-wheel seed-metering device was designed to improve the direct seeding performance for rice. The sphericity was selected as the indicator of 3-dimension size of rice seeds. According to the simulation test by EDEM software for seeding process in 3 varieties of rice seeds with different sphericity (Gangyou 898, Guofeng No.1 and Gangyou 3551) under 6 seed-metering device rotational speeds, the changing laws of seeding performance of rice seeds with different sphericity under different rotational speeds were obtained and the influences of rotational speeds and seed sphericity on seeding performance were analyzed. The simulation results showed that the seeding performance of rice seeds of Gangyou 898 was better than other 2 varieties of rice seeds when the rotational speed of seeding wheel was between 15 to 40 r/min, when the rotational speed of seeding wheel was between 15 to 30 r/min, the seeding qualified rate of those 3 varieties rice seeds floated between 84.01% to 87.91%, and the seeding qualified rate had a increasing trend of overall presentation as the rotational speed of seeding wheel increases, when the rotational speed of seeding wheel was faster than 30 r/min, the seeding qualified rate declined significantly with the increasing of rotational speed. 5 varieties of rice seeds with different sphericity (Guofeng No.1, Liangyou 628, Gangyou 898, Gangfeng 188 and Gangyou 3551) were selected as experimental materials. The rotational speeds of seeding wheel and seed sphericity were selected as influence factors, and seeding qualified rate, missing rate and replay rate were taken as evaluation standards. The bench test was done with the quadratic regression orthogonal combination design method. The regression equation and response surface between the performance index and the rotational speed and seed sphericity were acquired to verify the simulation results after analyzing those data by Design-Expert 8.0.6 software. Finally, the optimal parameter combination was obtained through the regression equation: the rotational speed of seeding wheel was 27.12 r/min and seed sphericity was 44.61%. In this case, the qualified rate is 83.90%, the missing rate is 5.43% and the replay rate is 10.67%, which is the best seeding performance for the seed-metering devices. The results from bench test were in accordance with that from simulation. The changing trends of seeding performance in bench test with rotational speed and seed sphericity were also basically consistent with that in simulation experiments. The field test result showed that, when the average rotational speed was 27.12 r/min and the forward velocity was 5.85 km/h, the seeding performance of seed-metering device could meet the requirements of precision sowing for all size grades of rice seeds. The research results provide a reference for structure optimization and performance improvement of slide hole-wheel precision seed-metering device.
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