本文選題：潤滑脂 + 輸送系統(tǒng)��； 參考：《中國礦業(yè)大學》2015年碩士論文

【摘要】：潤滑脂是一種由基礎油、稠化劑、添加劑混合而成的半固態(tài)機械潤滑劑,具有極壓、抗磨、密封性好等良好的潤滑性能,因而廣泛應用于低速重載裝備領域的開式潤滑系統(tǒng)中。現代機械裝備的大型化、重載化、自動化趨勢對脂潤滑的可靠性要求越來越高,而潤滑脂粘稠度大、輸送困難,使得目前的集中供脂裝置難以可靠地完成定時、定量的供脂任務。深入研究潤滑脂輸送系統(tǒng)對于保障機械設備潤滑、降低磨損具有重要意義。為解決這一難題,本文首先研究了潤滑脂的微觀結構及在圓管中的流動特性,為輸送系統(tǒng)的研制提供了理論基礎;然后提出了潤滑脂泵送系統(tǒng)設計方案,進行了輸送系統(tǒng)的理論及仿真分析;最后通過實驗研究分析驗證了潤滑脂泵送系統(tǒng)的可行性及工作可靠性。主要研究結果如下:(1)對潤滑脂的流變特性機理、主要指標及潤滑脂運動基本方程進行了系統(tǒng)分析,建立了基于圓管流動條件下潤滑脂流動特性模型。通過對3#鋰基潤滑脂進行流變實驗得出了潤滑脂擬合流變方程,并借助擬合參數進行了潤滑脂圓管流動行為參數的預測。(2)提出了采用曲軸驅動并將液壓缸與潤滑脂泵相結合進行輸送的潤滑脂泵送系統(tǒng)方案并建立了潤滑脂泵實體模型,分析得出了曲軸結構優(yōu)化方案并進行了曲軸應力應變分析。運用AMESim軟件建立了系統(tǒng)仿真模型,分析了潤滑脂泵送系統(tǒng)的輸出壓力、流量特性以及曲軸、活塞動力學特性。結果表明:流量曲線以及曲軸、活塞運動曲線均與理論值基本吻合,流量曲線波動達12%,能夠滿足系統(tǒng)設計要求;輸出壓力與流量曲線表現平穩(wěn),滿足了系統(tǒng)對輸出性能穩(wěn)定的要求;系統(tǒng)表現出了良好的穩(wěn)定性。(3)運用FLUENT軟件分析了潤滑脂在泵體中的流動行為,得出吸排脂過程中潤滑脂腔壓力、速度、粘度分布云圖。結果表明:活塞移動初始及結束階段潤滑脂腔內無明顯壓力沖擊現象,潤滑脂泵工作穩(wěn)定性良好;活塞移動時管壁處潤滑脂因受剪切作用而粘度降低,這種剪切稀化特性有利于泵體對潤滑脂的輸送;對于進脂口與潤滑脂腔下交界處出現壓力和速度突變問題,給出了優(yōu)化措施。(4)搭建了潤滑脂泵送系統(tǒng)模擬試驗臺,對系統(tǒng)的輸出流量、輸出壓力特性以及液壓缸與潤滑脂泵協(xié)同工作可靠性方面進行了實驗驗證。結果表明:潤滑脂的輸出壓力及輸出流量值均與理論及仿真結果吻合,完全滿足工況要求;增壓缸與泵體之間協(xié)同工作效果可靠,系統(tǒng)工作效率高。
[Abstract]:Grease is a semi-solid mechanical lubricant mixed with base oil, thickener and additive. It has excellent lubricating properties such as extreme pressure, anti-wear and good sealing, so it is widely used in open lubricating system in the field of low speed and heavy load equipment. The trend of large scale, heavy load and automation of modern machinery and equipment requires higher and higher reliability of grease lubrication. However, the high viscosity of grease and difficulty in conveying make it difficult for the current centralized grease supply device to reliably complete the timing. Quantitative fat supply. It is of great significance to study the grease conveying system to guarantee the lubrication of mechanical equipment and to reduce the wear. In order to solve this problem, this paper first studies the microstructure of grease and the flow characteristics of the grease in the pipe, which provides the theoretical basis for the development of the conveying system, and then puts forward the design scheme of the grease pumping system. Finally, the feasibility and reliability of the grease pumping system are verified by the experimental research and analysis. The main results are as follows: (1) the rheological mechanism, main indexes and basic equations of lubricating grease motion are systematically analyzed, and the flow characteristic model of lubricating grease under the condition of pipe flow is established. The rheological equation of the grease was obtained by the rheological test of the lithium-base grease. With the aid of fitting parameters, the prediction of the flow behavior parameters of lubricating grease pipe is carried out. (2) the scheme of grease pumping system driven by crankshaft and the combination of hydraulic cylinder and grease pump is put forward, and the solid model of grease pump is established. The optimization scheme of crankshaft structure is obtained and the stress-strain analysis of crankshaft is carried out. The simulation model of the system is established by using AMESim software. The output pressure, flow rate, crankshaft and piston dynamics of the grease pumping system are analyzed. The results show that the flow curve, crankshaft and piston motion curve are basically consistent with the theoretical value, the flow curve fluctuates to 12, which can meet the system design requirements, and the output pressure and flow curves are stable. The system shows good stability. The flow behavior of lubricating grease in pump body is analyzed by FLUENT software, and the distribution of pressure, velocity and viscosity of grease cavity in the process of suction and discharging is obtained. The results show that there is no obvious pressure shock phenomenon in the grease cavity during the initial and end stages of piston movement, and the grease pump has good working stability, and the viscosity of the lubricating grease at the pipe wall decreases because of the shear action when the piston moves. This shearing thinning characteristic is advantageous to the pump body conveying the grease; for the sudden change of pressure and velocity at the junction between the inlet and the grease cavity, the optimization measures are given. 4) A grease pumping system simulation test-bed is built. The system output flow, output pressure characteristics and the reliability of the hydraulic cylinder and lubricating grease pump are verified experimentally. The results show that the output pressure and the output flow value of the grease are in agreement with the theoretical and simulation results, which fully meet the requirements of the working conditions, and the cooperative working effect between the pressurized cylinder and the pump body is reliable, and the system work efficiency is high.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE626.4;TE964

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本文編號：1911063