农业机械学报2024，Vol.55Issue(7)：142-153,167,13.DOI:10.6041/j.issn.1000-1298.2024.07.014
交错勾齿式小麦精量排种器设计与试验
Design and Experiment of Wheat Precision Seed Metering Device with Staggered Hook-tooth
摘要
Abstract
Aiming at the demand for precision seeding of wheat and the uniformity seed spacing,a precision seed metering device with staggered hook-tooth was designed.The hook tooth were used to grab seeds orderly,and the staggered arrangement of the teeth allows the falling seeds to form a staggered and ordered surface,reducing collision and overlap between seeds.The key structural parameters and curve profile of the hole were determined by analyzing the seed postures during seed-filling process.The effects of the rotational speed of the seeding wheel and the angle of the seed-filling area on the operation performance were analyzed by using discrete element method EDEM.The simulation results showed that the speed of the seeding wheel had a significant effect on the seeds postures.The increase in the angle of the seed-filling area was conducive to improving the seed-filling performance.However,too large an angle of the filling area may cause the successfully filled seeds to fall out of the hole.On this basis of that,laboratory tests were conducted.Qualified rate,single rate,and multiple rate were used as performance indicators.Rotational speed of seeding wheel,height of seed-filling area and speed ratio of brush/seeding wheel were the test factors.The regression equations of the qualified rate,single rate,and multiple rate were obtained.Through the regression equations,it was found that the optimum performance of the seed metering device was achieved.A validation tests were carried out using the optimal parameters at the seeding wheel speed of 18 r/min,the height of seed-filling area of 73 mm,and the speed ratio of brush/seeding wheel of 2.5.The qualification rate was 90.36%,and the single rate was 87.26%,which verified the reliability of the regression model.Comparison tests were carried out by selecting the seed metering device commonly used in wheat planter.A high speed camera was used to capture the process of seed dropping.The metering device designed realized the staggered and orderly seeds falling,which improved the uniformity of seed distribution.The research result can provide theoretical support for the development of wheat precision seeding technology.关键词
小麦精量排种器/交错勾齿式/精量播种/EDEMKey words
wheat precision seed metering device/staggered hook-tooth/precision seeding/EDEM分类
农业科技引用本文复制引用
王云霞,黄苏同,张文毅,祁兵,周荀泽,丁友强..交错勾齿式小麦精量排种器设计与试验[J].农业机械学报,2024,55(7):142-153,167,13.基金项目
国家重点研发计划项目(2021YFD2000402)、江苏省农业科技自主创新资金项目(CX(23)3027)、中国农业科学院科技创新工程项目(CAAS-SAE-202301)和江苏省自然科学基金项目(BK20211021) （2021YFD2000402）
