二级偏块振动磨主隔振机理研究与试验

Main vibration and vibration isolation mechanism of a vibration mill with two-level partial blocks

针对现有超细粉碎中物料团聚及不细化的瓶颈问题,进行具有强非线性激振功能的二级偏块振动磨主隔振机理研究,样机主振系统采用非线性硬特性线变节距橡胶涂层复合弹簧,使其刚度具有随振强变化而变化的特性,以适应主振系统储能节能和稳定工作的需求;隔振系统采用具有高内阻的环形橡胶复合弹簧,使主振弹簧传递的高振强,通过隔振系统得到大部吸收;样机试验测得系统的加速度时域曲线和功率谱曲线,显示出主振与隔振系统对高振强的利用与隔振的非线性作用效果;初步实现超细颗粒的解团聚和颗粒细化问题,使目前采用粉碎法对超硬粉体进行超细粉碎徘徊在微米级水平上的现状得已突破;试验取得输入d(0.5):10μm、输出d(0.5):0.175μm的阶段性成果。

To break through bottleneck problems that materials were agglomerate and not refined in current ultrafine pulverization operations, main vibration and vibration isolation mechanism of a vibration mill with two-level partial blocks under strongly nonlinear excitation were analyzed. The variable pitch rubber coating composite spring with nonlinear hard-features was used in the main vibration system of the model machine whose stiffness could change along with the change of vibration intensity to meet the requirements of energy-saving and stable. The canvas rubber ring composite spring with high internal damping was adopted in the vibration isolation system, so that most of the high vibration intensity transmitted by the main vibration spring could be absorbed by the vibration isolation system. The time domain curve of acceleration and power spectrum curve showed the absorption of high vibration intensity and the nonlinear effect of vibration isolation. This study solved some problems of gathering super-fine particles and grain refinement, and broke through the status that the super-fine grinding of super-hard powder remained at the micron level. An achievement was obtained with the input particle size of d（0.5） = 10p, m while the output particle size of d（0.5） =0. 172μm.