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李姗姗,廖庆喜,王都,姚露,雷小龙,王磊,邢鹤琛.油菜气力滚花滚筒式精量集排器充种性能仿真分析与试验[J].华中农业大学学报,2017,36(5):99-107
油菜气力滚花滚筒式精量集排器充种性能仿真分析与试验
Simulation analyses and experiments of seed filling performance of pneumatic knurled cylinder-type centralized precision metering device for rapeseed
投稿时间:2017-01-04  
DOI:
中文关键词:  气力式精量集排器  滚花排种滚筒  EDEM仿真分析  充种性能  种群充填角  油菜
英文关键词:pneumatic cylinder-type centralized precision metering device  the knurled cylinder  EDEM simulation  seed filling performance  the seed filling angle  rape
基金项目:国家自然科学基金项目(51575218、51405180);国家油菜产业体系专项(CARS-13);农业科研杰出人才及其创新团队;湖北省技术创新专项重大项目(2016ABA094)
作者单位E-mail
李姗姗 华中农业大学工学院,武汉 430070 lishanshan19911219@163.com 
廖庆喜 1.华中农业大学工学院,武汉 4300702.南方粮油作物协同创新中心,长沙 410128 liaoqx@mail.hzau.edu.cn 
王都 华中农业大学工学院,武汉 430070  
姚露 华中农业大学工学院,武汉 430070  
雷小龙 华中农业大学工学院,武汉 430070  
王磊 华中农业大学工学院,武汉 430070  
邢鹤琛 华中农业大学工学院,武汉 430070  
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中文摘要:
      为提高油菜气力滚筒式精量集排器的充种性能,设计1种滚花排种滚筒,确定了滚花排种滚筒的结构参数,构建了充种区强制带动层种子的力学模型。EDEM仿真分析滚花结构、排种滚筒转速和充填高度对种群充填角、拖带角和动力学特性的影响。结果表明:滚花排种滚筒拖带角随排种滚筒转速增大而增大,且大于无滚花排种滚筒;种群充填角随排种滚筒与种群间的摩擦力增加而增加。同时,随排种滚筒转速的增加,种群所受合力、法向力和切向力以及种群速度线性增加;随充填高度的增加,种群所受合力和种群速度线性增加,且排种滚筒转速或充填高度一定时,滚花排种滚筒的种群动力学特性优于无滚花排种滚筒。台架试验表明:当排种器负压为-2 500 Pa、正压为500 Pa、充填高度为-5 mm、排种滚筒转速为30 r/min时,合格指数90.10%,漏播指数1.56%;当排种滚筒转速在15~50 r/min范围内时,各行排量一致性变异系数和总排量稳定性变异系数分别低于5.5%和2.0%,种子破损率低于0.2%。田间试验结果表明,以滚花排种滚筒为关键部件的集排器能满足油菜播种机技术要求。
英文摘要:
      A knurled cylinder for pneumatic cylinder-type centralized precision metering device for rapeseed was developed.The mechanical model of the single rapeseed on the compulsive driving layer in the filling area was established via analyzing the motion trajectory of each single seed.The EDEM simulation was conducted to study the effects of the knurled structure,cylinder rotational speed and seed filling height on the dynamic characteristics of seed.The results showed that the seed filling angle and filling performance increased with the increase of the friction between the cylinder and rapeseed.The cylinder rotational speed and seeding filling height affected the angle of seed filling and towing.With the increase of the cylinder rotational speed,the normal force and tangential force between cylinder and rapeseed,the total force and velocity of the rapeseed increased linearly.With the increase of the seed filling height,the total force and velocity of rapeseed increased linearly.The dynamics characteristics of rapeseed with knurled cylinder was better than that of the normal cylinder.The results of bench experiments showed that the positive pressure was 500 Pa,the seed filling height was -5 mm,and the cylinder rotational speed was 30 r/min with good seedling performance when the negative pressure was about 2 500 Pa.When the quality index was 90.10%,the loss index was 1.56%.When the cylinder rotational speed was between 15 r/min and 50 r/min,the variation coefficient of the consistency of each line displacement,stability of the total displacement and rapeseed damage rate were less than 5.5%,2.0% and 0.2%,respectively.The results of the field experiments showed that the pneumatic cylinder type centralized precision metering device for rapeseed oil satisfied the technical requirements of rapeseed planter with which the knurled cylinder was the key part.It will provide a reference for optimizing the structure of centralized precision metering device and improving seedling performance.
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