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水稻钵苗对辊式拔秧机构 总被引:1,自引:0,他引:1
针对我国水稻钵苗移栽技术对栽植机械的要求,在分析现有机型特点的基础上,提出了用于水稻钵苗拔秧的对辊式拔秧机构的设计方案,并介绍了该机构工作原理;通过拔秧机构的运动和拔秧过程分析,确定了拔秧机构工作参数的选取原则和取值范围,完成了对辊式拔秧机构的设计、试制及试验.试验结果表明,采用对辊式拔秧机构实现了水稻钵苗的自动输秧和拔秧,具有结构简单、秧苗损伤小、工作可靠等优点,为水稻钵苗有序成行栽植机械的设计奠定了基础. 相似文献
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The indexing transmission chain error of gear cutting machines is an obviously periodic timefunction. If data are acquired properly while surveying and analyzing the error with grating typeinstrument attached to a micro-computer, the analysis will be easier and quicker. In this paper,such a system is introduced; a data acquiring interface is designed. Therefore, real-time samplingcan be performed. The results obtained from the indexing tramsmission chain error of several gearhobbing and shaping machines with this system were satisfactory. 相似文献
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A computational approach is presented to handle an enlarged linear rotordynamic model whichsimultaneously includes both radial and misalignment motions.The interactive force and momentbetween the rotating and non-rotating members are modeled using an adaptation of the classicalReynolds lubrication equation for incompressible laminar isoviscous films.First,the governingequation is derived and the method of solution is introduced based on a 2-dimension,9-point cen-tral difference.Second,force and moment components are computed by numerical integration ofthe film pressure distribution.Finally,the rotordynamic coefficients are yielded according to thegeneralized force gradients. 相似文献
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In this paper,the Riccati transfer matrix method and the modal parameter identification tech-nique are applied to the dynamic analysis of the spindle system of a machine tool,the X62Wknee-type universal milling machine.With-the help of a computer,the lowest three critical speedsare calculated and these are compared with the values measured by a 7T17S analyzer,showing afairly good agreement. 相似文献
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