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

【摘要】：液壓傳動技術是汽車起重機傳動和控制的關鍵基礎技術,能量在液壓系統(tǒng)中進行傳遞時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,導致油溫的升高。油溫過高會嚴重影響起重機的工作效率、作業(yè)性能,縮短起重機的使用壽命,如何合理控制液壓系統(tǒng)的熱平衡點關系到汽車起重機的工作效率、使用可靠性,以及起重機生產(chǎn)企業(yè)的市場競爭力。傳統(tǒng)的熱平衡設計計算涉及到液壓系統(tǒng)各節(jié)點的功率損失、壓力損失等,是對功能性設計的補充,其計算方法復雜、誤差較大,不能滿足有關熱平衡的精確設計要求。本文通過對汽車起重機使用工況的研究,分析得出卷揚和回轉(zhuǎn)是汽車起重機最主要的產(chǎn)熱工況,確定了以卷揚和回轉(zhuǎn)構(gòu)成的起重機循環(huán)工況,并對循環(huán)工況下的液壓系統(tǒng)產(chǎn)熱原因進行了詳細的分析。為簡化液壓系統(tǒng)熱平衡的計算方法,提高計算精度,根據(jù)汽車起重機循環(huán)工況下的能量傳遞情況,提出并推導了基于能量守恒的熱平衡計算方法,建立了數(shù)學模型,利用該數(shù)學模型針對某型號汽車起重機液壓系統(tǒng)的產(chǎn)散熱情況進行了計算。為進一步確定關鍵元部件對熱平衡情況的影響,選用AMESim仿真軟件,建立了起重機的熱液壓模型,對模型中部分參數(shù)進行優(yōu)化,對比油液溫升的結(jié)果,說明了各參數(shù)對熱平衡性能的影響,并提出了改進建議。為驗證計算結(jié)果和仿真結(jié)論,進行了大量的實驗,確定了液壓系統(tǒng)的主要產(chǎn)熱和散熱元部件,并對元部件的產(chǎn)熱和散熱效率進行了評估。在評估三聯(lián)泵的工作效率時,提出并推導了泵和馬達總效率的熱力學測定法。最后,擬定了起重機的改進方案,并進行了實車改進,通過實驗證明,改進方案效果明顯。
[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.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH213.6

【引證文獻】

相關碩士學位論文 前1條

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

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本文編號：1706084