本文選題：汽車起重機(jī)　切入點(diǎn)：液壓系統(tǒng)　出處：《吉林大學(xué)》2011年碩士論文

【摘要】：液壓傳動(dòng)技術(shù)是汽車起重機(jī)傳動(dòng)和控制的關(guān)鍵基礎(chǔ)技術(shù),能量在液壓系統(tǒng)中進(jìn)行傳遞時(shí)不可避免的存在損失,這部分能量絕大部分轉(zhuǎn)化為熱量傳遞到液壓系統(tǒng)中,導(dǎo)致油溫的升高。油溫過高會(huì)嚴(yán)重影響起重機(jī)的工作效率、作業(yè)性能,縮短起重機(jī)的使用壽命,如何合理控制液壓系統(tǒng)的熱平衡點(diǎn)關(guān)系到汽車起重機(jī)的工作效率、使用可靠性,以及起重機(jī)生產(chǎn)企業(yè)的市場(chǎng)競(jìng)爭(zhēng)力。傳統(tǒng)的熱平衡設(shè)計(jì)計(jì)算涉及到液壓系統(tǒng)各節(jié)點(diǎn)的功率損失、壓力損失等,是對(duì)功能性設(shè)計(jì)的補(bǔ)充,其計(jì)算方法復(fù)雜、誤差較大,不能滿足有關(guān)熱平衡的精確設(shè)計(jì)要求。本文通過對(duì)汽車起重機(jī)使用工況的研究,分析得出卷?yè)P(yáng)和回轉(zhuǎn)是汽車起重機(jī)最主要的產(chǎn)熱工況,確定了以卷?yè)P(yáng)和回轉(zhuǎn)構(gòu)成的起重機(jī)循環(huán)工況,并對(duì)循環(huán)工況下的液壓系統(tǒng)產(chǎn)熱原因進(jìn)行了詳細(xì)的分析。為簡(jiǎn)化液壓系統(tǒng)熱平衡的計(jì)算方法,提高計(jì)算精度,根據(jù)汽車起重機(jī)循環(huán)工況下的能量傳遞情況,提出并推導(dǎo)了基于能量守恒的熱平衡計(jì)算方法,建立了數(shù)學(xué)模型,利用該數(shù)學(xué)模型針對(duì)某型號(hào)汽車起重機(jī)液壓系統(tǒng)的產(chǎn)散熱情況進(jìn)行了計(jì)算。為進(jìn)一步確定關(guān)鍵元部件對(duì)熱平衡情況的影響,選用AMESim仿真軟件,建立了起重機(jī)的熱液壓模型,對(duì)模型中部分參數(shù)進(jìn)行優(yōu)化,對(duì)比油液溫升的結(jié)果,說明了各參數(shù)對(duì)熱平衡性能的影響,并提出了改進(jìn)建議。為驗(yàn)證計(jì)算結(jié)果和仿真結(jié)論,進(jìn)行了大量的實(shí)驗(yàn),確定了液壓系統(tǒng)的主要產(chǎn)熱和散熱元部件,并對(duì)元部件的產(chǎn)熱和散熱效率進(jìn)行了評(píng)估。在評(píng)估三聯(lián)泵的工作效率時(shí),提出并推導(dǎo)了泵和馬達(dá)總效率的熱力學(xué)測(cè)定法。最后,擬定了起重機(jī)的改進(jìn)方案,并進(jìn)行了實(shí)車改進(jìn),通過實(shí)驗(yàn)證明,改進(jìn)方案效果明顯。
[Abstract]:Hydraulic transmission technology is the key basic technology for transmission and control of truck crane. The loss of energy in hydraulic system is inevitable, and most of the energy is transferred to hydraulic system.Cause the oil temperature to rise.If the oil temperature is too high, it will seriously affect the working efficiency of the crane, the working performance, and shorten the service life of the crane. How to control the heat balance point of the hydraulic system reasonably relates to the working efficiency and the reliability of the truck crane.As well as crane production enterprises market competitiveness.The traditional calculation of heat balance design involves the power loss and pressure loss of each node of hydraulic system, which is a supplement to the functional design. The calculation method is complex and the error is large, which can not meet the requirements of accurate design of heat balance.Through the study of the working conditions of the truck crane, it is concluded that the hoisting and turning are the main heat producing conditions of the truck crane, and the circulating condition of the crane is determined, which is composed of the hoisting and the turning.The causes of heat production in hydraulic system under circulating condition are analyzed in detail.In order to simplify the calculation method of heat balance of hydraulic system and improve the calculation accuracy, according to the energy transfer under the circulating condition of truck crane, the heat balance calculation method based on energy conservation is proposed and deduced, and the mathematical model is established.The mathematical model is used to calculate the heat dissipation of the hydraulic system of a certain type of truck crane.In order to further determine the influence of key components on the thermal balance, the thermal hydraulic model of crane was established by using AMESim simulation software, some parameters of the model were optimized, and the results of oil temperature rise were compared.The influence of various parameters on the thermal equilibrium performance is explained, and suggestions for improvement are put forward.In order to verify the results of calculation and simulation, a large number of experiments were carried out to determine the main heat production and heat dissipation components of the hydraulic system, and the heat production and heat dissipation efficiency of the components were evaluated.A thermodynamic method for measuring the total efficiency of the pump and motor is proposed and deduced when evaluating the working efficiency of the triple pump.Finally, the improvement scheme of crane is worked out, and the actual vehicle improvement is carried out. The experimental results show that the effect of the improved scheme is obvious.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH213.6

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 陳紀(jì)軍;320噸靜力壓樁機(jī)液壓系統(tǒng)熱平衡研究[D];中南大學(xué);2012年

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本文編號(hào)：1706084