【摘要】：隨著振動(dòng)篩分機(jī)械的推廣使用和工業(yè)生產(chǎn)的要求,振動(dòng)篩的振動(dòng)特性成為影響篩分效果的關(guān)鍵因素。本文從工程實(shí)際出發(fā),主要研究含彈性元件新型分級篩的振動(dòng)問題。 本文以振動(dòng)理論和動(dòng)力學(xué)為基礎(chǔ),應(yīng)用力學(xué)知識建立所研究問題的數(shù)學(xué)模型,分析了振動(dòng)篩振動(dòng)系統(tǒng)的動(dòng)力學(xué)特性；綜合考慮影響復(fù)雜振動(dòng)碰撞動(dòng)力學(xué)特性的各因素,重點(diǎn)分析橡膠彈簧的粘彈性能對系統(tǒng)動(dòng)力學(xué)特性的影響。 綜合考慮各因素(金屬彈簧K1、K2、橡膠彈簧K3、預(yù)壓縮量6、壓差阻尼H等)對振幅變化的影響,試驗(yàn)研究與理論計(jì)算表明,由K1、K2、K3、6、H組成的復(fù)雜振動(dòng)碰撞系統(tǒng),綜合以上各因素對振幅變化的影響,振動(dòng)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(fù)雜振動(dòng)過程中,當(dāng)工作頻率與系統(tǒng)固有頻率相等或接近時(shí)(即ω=ω0=(?) ω=ω0=(?)、ω=ω0=(?)、ω=ω0=(?)),系統(tǒng)發(fā)生共振,出現(xiàn)異常振動(dòng)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(dòng)頻率)之外存在一個(gè)或多個(gè)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(fù)雜振動(dòng)過程中,選用天然橡膠彈簧進(jìn)行試驗(yàn)研究,結(jié)果表明：振動(dòng)頻率在25～30Hz變化,當(dāng)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(shí),振動(dòng)篩系統(tǒng)振幅變化范圍為0～1.8mm。 本文所獲得的結(jié)論,為大型工業(yè)設(shè)備在生產(chǎn)工藝中應(yīng)用提供理論基礎(chǔ)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(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH237.6

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