A finite element model of one-arm planet carrier was built, and influence of structural parameters on strength and stiffness for one-arm planet carrier was analyzed. The stress and deformation of the round structure a...A finite element model of one-arm planet carrier was built, and influence of structural parameters on strength and stiffness for one-arm planet carrier was analyzed. The stress and deformation of the round structure and the triangle structure for one-arm planet carrier were analyzed and compared. The finite element model of the same specifications arms planet carrier was established, and influence of the connecting slab thickness and input side plate thickness on strength and stiffness for arms planet carrier was analyzed. Strength, stiffness and mass for one-arm and arms planet carrier in the same specifications were analyzed and compared.展开更多
At present,there is a lack of miniaturized and highly reliable plug seedling transplanting mechanism in flowerpots planting operation,in order to meet the needs of large displacement and high vertical uprightness for ...At present,there is a lack of miniaturized and highly reliable plug seedling transplanting mechanism in flowerpots planting operation,in order to meet the needs of large displacement and high vertical uprightness for flower transplanting,the paper combined the transmission characteristics of the non-circular gear planetary gear train with the swing flexibility of the cam gear and proposed a double planet carrier planetary gear transplanting mechanism.The linkage of the mechanism performs variable speed rotation relative to the first planet carrier,the linkage serves as the second planet carrier,and the transplanting arm performs variable speed swing relative to the linkage.A mathematical model of a single planetary carrier mechanism was first established using the method of open linkage group solution domain synthesis,then established the kinematic equations of the second planet carrier and the transplanting arm.The two parts are combined to form the mathematical solution model of the proposed mechanism.The initial trajectory was planned according to the trajectory requirements of seedlings planting operation,the non-circular gear pitch curve in the first planet carrier was obtained and the length of the first planet carrier is 120 mm.Then using the key points’angular deviation between the initial trajectory and the improved trajectory to obtain the cam parameters which driving the transplant arm,consequently determined the length of the second planet carrier is 69.25 mm and the length of the transplant arm is 112.4 mm.Finally,the prototype of the mechanism was manufactured,and the test verified the correctness of the design method of the double planet carrier planetary gear flower potting transplanting mechanism.The transplanting success rate of this mechanism reached 94.43%,and the plug seedlings planted in flowerpots had high uprightness.This research can provide a reference for the automatic development of research on flower transplanting machines.展开更多
高速逆流色谱技术在解决生物医药领域活性成分分离纯化的瓶颈问题上具有无不可逆吸附、样品回收率高、耐受性好等独特优势,因此十分有必要提升现有小型高速逆流色谱仪的分离纯化效能,开发具有高效、快速、大容量制备能力的工业型高速逆...高速逆流色谱技术在解决生物医药领域活性成分分离纯化的瓶颈问题上具有无不可逆吸附、样品回收率高、耐受性好等独特优势,因此十分有必要提升现有小型高速逆流色谱仪的分离纯化效能,开发具有高效、快速、大容量制备能力的工业型高速逆流色谱仪。作者以大容量高速逆流色谱仪的行星架结构为研究对象,首先在3维软件中设计行星架结构,并以仿真软件HyperWorks为平台,建立有限元模型,根据行星架上主要负载的受力特点施加载荷及约束条件,进行了静力学分析及模态分析,发现其最大变形和最大等效应力都较小,1阶模态频率较高,可进一步优化结构。基于变密度法中的SIMP(solid isotropicmaterial with penalization)插值模型,利用折衷规划法建立了提高刚度并减小柔度的多目标函数的数学模型,对行星架进行结构拓扑优化,寻求材料更合理分布,并得到了优化结构。在优化结果的基础上重新设计了新行星架,再次进行动静力学性能仿真分析,确保行星架结构改进设计的合理性。研究表明:仿真分析结果验证了结构的安全可靠性,优化后的行星架的各项性能都能满足要求,并且质量降低了13.1%,得到了比原始结构更加优良的新结构。展开更多
基金Funded by National Science and Technology Support Program(Grant No.2013BAF01B05)Zhengzhou Science and Technology Project(Grant No.121PZDGG255)
文摘A finite element model of one-arm planet carrier was built, and influence of structural parameters on strength and stiffness for one-arm planet carrier was analyzed. The stress and deformation of the round structure and the triangle structure for one-arm planet carrier were analyzed and compared. The finite element model of the same specifications arms planet carrier was established, and influence of the connecting slab thickness and input side plate thickness on strength and stiffness for arms planet carrier was analyzed. Strength, stiffness and mass for one-arm and arms planet carrier in the same specifications were analyzed and compared.
基金This work was financially supported by the National Key Research and Development Program of China(Grant No.2017YFD0700800)the National Natural Science Foundation of China(Grant No.32071909,No.51775512)+1 种基金Basic public welfare research projects of Zhejiang Province(Grant No.LGN19E050002,No.LGN20E050006)Fundamental Research Funds of Zhejiang Sci-Tech University(Grant No.2020Q013).
文摘At present,there is a lack of miniaturized and highly reliable plug seedling transplanting mechanism in flowerpots planting operation,in order to meet the needs of large displacement and high vertical uprightness for flower transplanting,the paper combined the transmission characteristics of the non-circular gear planetary gear train with the swing flexibility of the cam gear and proposed a double planet carrier planetary gear transplanting mechanism.The linkage of the mechanism performs variable speed rotation relative to the first planet carrier,the linkage serves as the second planet carrier,and the transplanting arm performs variable speed swing relative to the linkage.A mathematical model of a single planetary carrier mechanism was first established using the method of open linkage group solution domain synthesis,then established the kinematic equations of the second planet carrier and the transplanting arm.The two parts are combined to form the mathematical solution model of the proposed mechanism.The initial trajectory was planned according to the trajectory requirements of seedlings planting operation,the non-circular gear pitch curve in the first planet carrier was obtained and the length of the first planet carrier is 120 mm.Then using the key points’angular deviation between the initial trajectory and the improved trajectory to obtain the cam parameters which driving the transplant arm,consequently determined the length of the second planet carrier is 69.25 mm and the length of the transplant arm is 112.4 mm.Finally,the prototype of the mechanism was manufactured,and the test verified the correctness of the design method of the double planet carrier planetary gear flower potting transplanting mechanism.The transplanting success rate of this mechanism reached 94.43%,and the plug seedlings planted in flowerpots had high uprightness.This research can provide a reference for the automatic development of research on flower transplanting machines.
文摘高速逆流色谱技术在解决生物医药领域活性成分分离纯化的瓶颈问题上具有无不可逆吸附、样品回收率高、耐受性好等独特优势,因此十分有必要提升现有小型高速逆流色谱仪的分离纯化效能,开发具有高效、快速、大容量制备能力的工业型高速逆流色谱仪。作者以大容量高速逆流色谱仪的行星架结构为研究对象,首先在3维软件中设计行星架结构,并以仿真软件HyperWorks为平台,建立有限元模型,根据行星架上主要负载的受力特点施加载荷及约束条件,进行了静力学分析及模态分析,发现其最大变形和最大等效应力都较小,1阶模态频率较高,可进一步优化结构。基于变密度法中的SIMP(solid isotropicmaterial with penalization)插值模型,利用折衷规划法建立了提高刚度并减小柔度的多目标函数的数学模型,对行星架进行结构拓扑优化,寻求材料更合理分布,并得到了优化结构。在优化结果的基础上重新设计了新行星架,再次进行动静力学性能仿真分析,确保行星架结构改进设计的合理性。研究表明:仿真分析结果验证了结构的安全可靠性,优化后的行星架的各项性能都能满足要求,并且质量降低了13.1%,得到了比原始结构更加优良的新结构。
