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

【摘要】：潤(rùn)滑脂是一種由基礎(chǔ)油、稠化劑、添加劑混合而成的半固態(tài)機(jī)械潤(rùn)滑劑,具有極壓、抗磨、密封性好等良好的潤(rùn)滑性能,因而廣泛應(yīng)用于低速重載裝備領(lǐng)域的開(kāi)式潤(rùn)滑系統(tǒng)中�，F(xiàn)代機(jī)械裝備的大型化、重載化、自動(dòng)化趨勢(shì)對(duì)脂潤(rùn)滑的可靠性要求越來(lái)越高,而潤(rùn)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(shí)、定量的供脂任務(wù)。深入研究潤(rùn)滑脂輸送系統(tǒng)對(duì)于保障機(jī)械設(shè)備潤(rùn)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(rùn)滑脂的微觀結(jié)構(gòu)及在圓管中的流動(dòng)特性,為輸送系統(tǒng)的研制提供了理論基礎(chǔ);然后提出了潤(rùn)滑脂泵送系統(tǒng)設(shè)計(jì)方案,進(jìn)行了輸送系統(tǒng)的理論及仿真分析;最后通過(guò)實(shí)驗(yàn)研究分析驗(yàn)證了潤(rùn)滑脂泵送系統(tǒng)的可行性及工作可靠性。主要研究結(jié)果如下:(1)對(duì)潤(rùn)滑脂的流變特性機(jī)理、主要指標(biāo)及潤(rùn)滑脂運(yùn)動(dòng)基本方程進(jìn)行了系統(tǒng)分析,建立了基于圓管流動(dòng)條件下潤(rùn)滑脂流動(dòng)特性模型。通過(guò)對(duì)3#鋰基潤(rùn)滑脂進(jìn)行流變實(shí)驗(yàn)得出了潤(rùn)滑脂擬合流變方程,并借助擬合參數(shù)進(jìn)行了潤(rùn)滑脂圓管流動(dòng)行為參數(shù)的預(yù)測(cè)。(2)提出了采用曲軸驅(qū)動(dòng)并將液壓缸與潤(rùn)滑脂泵相結(jié)合進(jìn)行輸送的潤(rùn)滑脂泵送系統(tǒng)方案并建立了潤(rùn)滑脂泵實(shí)體模型,分析得出了曲軸結(jié)構(gòu)優(yōu)化方案并進(jìn)行了曲軸應(yīng)力應(yīng)變分析。運(yùn)用AMESim軟件建立了系統(tǒng)仿真模型,分析了潤(rùn)滑脂泵送系統(tǒng)的輸出壓力、流量特性以及曲軸、活塞動(dòng)力學(xué)特性。結(jié)果表明:流量曲線以及曲軸、活塞運(yùn)動(dòng)曲線均與理論值基本吻合,流量曲線波動(dòng)達(dá)12%,能夠滿足系統(tǒng)設(shè)計(jì)要求;輸出壓力與流量曲線表現(xiàn)平穩(wěn),滿足了系統(tǒng)對(duì)輸出性能穩(wěn)定的要求;系統(tǒng)表現(xiàn)出了良好的穩(wěn)定性。(3)運(yùn)用FLUENT軟件分析了潤(rùn)滑脂在泵體中的流動(dòng)行為,得出吸排脂過(guò)程中潤(rùn)滑脂腔壓力、速度、粘度分布云圖。結(jié)果表明:活塞移動(dòng)初始及結(jié)束階段潤(rùn)滑脂腔內(nèi)無(wú)明顯壓力沖擊現(xiàn)象,潤(rùn)滑脂泵工作穩(wěn)定性良好;活塞移動(dòng)時(shí)管壁處潤(rùn)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(duì)潤(rùn)滑脂的輸送;對(duì)于進(jìn)脂口與潤(rùn)滑脂腔下交界處出現(xiàn)壓力和速度突變問(wèn)題,給出了優(yōu)化措施。(4)搭建了潤(rùn)滑脂泵送系統(tǒng)模擬試驗(yàn)臺(tái),對(duì)系統(tǒng)的輸出流量、輸出壓力特性以及液壓缸與潤(rùn)滑脂泵協(xié)同工作可靠性方面進(jìn)行了實(shí)驗(yàn)驗(yàn)證。結(jié)果表明:潤(rùn)滑脂的輸出壓力及輸出流量值均與理論及仿真結(jié)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(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE626.4;TE964

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本文編號(hào)：1911063