穴盘育苗精密播种装置压电振动台特性分析与试验

利用压电元件的逆压电效应设计了一种用于精密播种蔬菜、花卉、林木等微小种子的压电振动台,在外加电场的作用下使压电振动驱动系统产生机械微位移,经位移放大机构放大后驱动种子盘振动,使种子盘上的种子产生有利于吸种盘吸种的"沸腾"运动。建立了压电振动台数学模型,研究分析了压电振动台的动、静态特性并进行了试验。试验结果表明:当外加电压为90～110 V时,压电驱动系统具有较强的驱动能力,振幅达1.31 mm,机械系统振动响应频率在13～55 Hz之间,且频宽可调(共振频率为25 Hz);压电振动台具有良好的动态特性和较好的播种性能,满足精密播种的农艺要求。

Analysis and Experiment on Characteristic of Piezoelectric Vibration Table for Precision Tray Seeding Device

A piezoelectricity vibration table was designed for seeding precisely the small size of seeds of some vegetables,trees,flowers,etc.The piezoelectric vibration driving system produced the mechanical micro-displacements with the applied electric field.The micro-displacements amplified by the amplification mechanism drove the seed dish vibrating and produced the boiling movement beneficial to suck seeds.The mathematical model of piezoelectric vibration was established.The static and dynamic state properties of the variation table were analyzed and experienced.The experimental results showed that the piezoelectric vibration system had a higher drive capacity with 90～110 V electric voltage.Vibration amplitude achieved 1.31 mm,vibration frequency was at 13～55 Hz and adjustable(resonant frequency of 25 Hz).The piezoelectric vibration table has better characteristics and higher seeding performances.It runs smoothly and meets the agronomic demands for precise tray seeding.