含弹性元件新型分级筛的动力学分析

发布时间：2018-08-09 16:17

【摘要】：随着振动筛分机械的推广使用和工业生产的要求,振动筛的振动特性成为影响筛分效果的关键因素。本文从工程实际出发,主要研究含弹性元件新型分级筛的振动问题。本文以振动理论和动力学为基础,应用力学知识建立所研究问题的数学模型,分析了振动筛振动系统的动力学特性；综合考虑影响复杂振动碰撞动力学特性的各因素,重点分析橡胶弹簧的粘弹性能对系统动力学特性的影响。综合考虑各因素(金属弹簧K1、K2、橡胶弹簧K3、预压缩量6、压差阻尼H等)对振幅变化的影响,试验研究与理论计算表明,由K1、K2、K3、6、H组成的复杂振动碰撞系统,综合以上各因素对振幅变化的影响,振动碰撞系统振幅公式可统一简化为A=F/K1-Mω2-F阻/K1;在K2、K3以弹性边界约束的作用参与复杂振动过程中,当工作频率与系统固有频率相等或接近时(即ω=ω0=(?) ω=ω0=(?)、ω=ω0=(?)、ω=ω0=(?)),系统发生共振,出现异常振动现象(异常频率段11.0Hz～18.6Hz、25.1Hz～29.7Hz)；在上述共振频率(异常振动频率)之外存在一个或多个最佳工作频率。在弹性元件橡胶弹簧K3以边界约束的作用参与复杂振动过程中,选用天然橡胶弹簧进行试验研究,结果表明：振动频率在25～30Hz变化,当天然橡胶弹簧刚度系数为500N/mm、蠕变为1.5～2mm、回弹率为20～30%时,振动筛系统振幅变化范围为0～1.8mm。本文所获得的结论,为大型工业设备在生产工艺中应用提供理论基础和参考依据。
[Abstract]:With the popularization and application of vibrating screen separating machine and the requirement of industrial production, the vibration characteristic of vibrating screen becomes the key factor that affects the screening effect. Based on the engineering practice, this paper mainly studies the vibration of a new type of graded screen with elastic elements. On the basis of vibration theory and dynamics, the mathematical model of the studied problem is established by applying the knowledge of mechanics, and the dynamic characteristics of vibration system of vibrating screen are analyzed, and the factors affecting the dynamic characteristics of complex vibration collision are considered synthetically. The influence of the viscoelastic energy of rubber spring on the dynamic characteristics of the system is analyzed. Considering the influence of various factors (metal spring K1K2, rubber spring K3, precompression volume 6, differential damping H, etc.) on the amplitude change, the experimental study and theoretical calculation show that the complex vibrational collision system consists of K1 K2K2K3K3O6H, Considering the effects of the above factors on the amplitude variation, the amplitude formula of the vibrational collision system can be simplified as A=F/K1-M 蠅 2-F resistance / K _ 1, and K _ 2K _ 3 takes part in the complex vibration process with elastic boundary constraints. When the operating frequency is equal to or close to the natural frequency of the system (i.e. 蠅 = 蠅 0 = 蠅 0 = 蠅 0 = 蠅 0 = (?), 蠅 = 蠅 0 = (?), 蠅 = 蠅 0 = (?) the resonance occurs in the system of 蠅 = 蠅 0 = (?), and the abnormal vibration occurs (11.0 Hz, 18.6 Hz, 25.1Hz). There is one or more optimal operating frequencies beyond the above resonant frequencies (abnormal vibration frequencies). In the process of complex vibration of rubber spring K3 with boundary constraint, the natural rubber spring is selected for experimental study. The results show that the vibration frequency varies with 25~30Hz. When the stiffness coefficient of the natural rubber spring is 500 N / mm, the creep is 1.5 mm and the springback is 20 ~ 30 mm, the amplitude of the vibrating screen system varies from 0 to 1.8 mm. The conclusions obtained in this paper provide theoretical basis and reference basis for the application of large-scale industrial equipment in production process.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH237.6

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