【摘要】：隨著振動篩分機械的推廣使用和工業(yè)生產(chǎn)的要求,振動篩的振動特性成為影響篩分效果的關鍵因素。本文從工程實際出發(fā),主要研究含彈性元件新型分級篩的振動問題。 本文以振動理論和動力學為基礎,應用力學知識建立所研究問題的數(shù)學模型,分析了振動篩振動系統(tǒng)的動力學特性；綜合考慮影響復雜振動碰撞動力學特性的各因素,重點分析橡膠彈簧的粘彈性能對系統(tǒng)動力學特性的影響。 綜合考慮各因素(金屬彈簧K1、K2、橡膠彈簧K3、預壓縮量6、壓差阻尼H等)對振幅變化的影響,試驗研究與理論計算表明,由K1、K2、K3、6、H組成的復雜振動碰撞系統(tǒng),綜合以上各因素對振幅變化的影響,振動碰撞系統(tǒng)振幅公式可統(tǒng)一簡化為A=F/K1-Mω2-F阻/K1;在K2、K3以彈性邊界約束的作用參與復雜振動過程中,當工作頻率與系統(tǒng)固有頻率相等或接近時(即ω=ω0=(?) ω=ω0=(?)、ω=ω0=(?)、ω=ω0=(?)),系統(tǒng)發(fā)生共振,出現(xiàn)異常振動現(xiàn)象(異常頻率段11.0Hz～18.6Hz、25.1Hz～29.7Hz)；在上述共振頻率(異常振動頻率)之外存在一個或多個最佳工作頻率。 在彈性元件橡膠彈簧K3以邊界約束的作用參與復雜振動過程中,選用天然橡膠彈簧進行試驗研究,結果表明：振動頻率在25～30Hz變化,當天然橡膠彈簧剛度系數(shù)為500N/mm、蠕變?yōu)?.5～2mm、回彈率為20～30%時,振動篩系統(tǒng)振幅變化范圍為0～1.8mm。 本文所獲得的結論,為大型工業(yè)設備在生產(chǎn)工藝中應用提供理論基礎和參考依據(jù)。
[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.
【學位授予單位】：湖南工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH237.6

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