【摘要】 以一种应用于蔬菜钵苗移栽机、能实现非匀速连续传动的新型旋转式取苗机构为研究对象,针对取苗机构运转平稳性问题,应用配重法改进取苗机构的结构,以减小机构振动、改善其动力学性能。建立配重优化设计模型,采用穷举法通过UG和ADAMS软件分析得到配重的质量和质心向径分别为0. 21 kg和102 mm。应用ADAMS软件开展取苗机构动力学仿真与分析,并进行取苗机构样机的动力学试验,对安装配重前、后取苗机构支座反力的仿真和试验结果分别进行比较,验证取苗机构动力学性能的改善。试验结果表明,取苗机构x和y方向支座反力的最大幅值分别由改进前的409 N和77 N减小为369 N和69 N,降低了9. 8%和10. 4%;其方差由改进前的5 126 N2和553 N2分别减小为3 391 N2和398 N2,降低了33. 8%和28%,表明取苗机构的动力学性能得到了改善,工作平稳性得以提高。更多还原

【Abstract】 A type of rotary seedling pick-up mechanism used in vegetable plug seedling transplanter which can realize non-uniform continuous transmission was taken as the research object. In order to improve the working stability of the seedling pick-up mechanism,the counterweights method was used to improve the structure of the seedling pick-up mechanism to reduce the vibration of the mechanism and improve the performance of the mechanism. The optimization design model of the counterweight was established,and the mass and centroid radius of the counterweight was determined as 0. 21 kg and102 mm respectively by using the exhaustive method through UG and ADAMS software. ADAMS software was applied to carry out the dynamics simulation and analysis of the seedling pick-up mechanism.Counterweight was machined and assembled on the mechanism prototype to conduct dynamics tests. The simulation and test results of bearing reaction force of the seedling pick-up mechanism after addition of the counterweight were compared with that before addition of the counterweight to verify the validity of the dynamics performance improvement of the seedling pick-up mechanism respectively. The prototype test results showed that the maximal amplitudes of bearing reaction force of the seedling pick-up mechanism in x and y directions were reduced from 409 N and 77 N before improvement to 369 N and 69 N,respectively,which were decreased by 9. 8% and 10. 4%. At the same time,the variances were reduced from 5 126 N2 and 553 N2 before improvement to 3 391 N2 and 398 N2,respectively,which were decreased by 33. 8% and 28%. The dynamics performance of the seedling pick-up mechanism was better and the working stability of the mechanism was also improved.更多还原