【摘要】：隨著我國經(jīng)濟高速的發(fā)展,工程機械行業(yè)發(fā)展迅猛,但是工業(yè)機械液壓系統(tǒng)在控制方面也對設(shè)計研發(fā)者提出了更高的要求。電液比例閥具有控制精度高,相應(yīng)速度快等優(yōu)點,在工程機械中得到廣泛應(yīng)用,國內(nèi)一度掀起了研制電液比例閥的浪潮,但是對于閥體內(nèi)部流量特性認識研究不足這一短柄制約著電液比例閥的發(fā)展,使得各方面技術(shù)落后,研發(fā)一直停留在仿制階段。本文采用理論分析與數(shù)值仿真相互結(jié)合的方法來彌補國內(nèi)電液比例閥研制的不足,深入研究了伊頓ZTS16電液比例閥的特性,并對其在挖掘機上的應(yīng)用進行了探討,為電液比例閥的研制和應(yīng)用提供一定的理論依據(jù)。文中建立了ZTS16電液比例閥的內(nèi)部流場三維模型,應(yīng)用ICEM CFD軟件對模型進行網(wǎng)格劃分,基于計算流體力學(xué)分析軟件Fluent對電液比例閥工作時內(nèi)部的壓力場、速度場、速度矢量場和湍動能場進行分析分析,詳細地描述了電液比例閥內(nèi)部的流動特征。利用幾何解析法對電液比例閥閥口的過流面積進行了簡單的分析計算,確定了過流面積的計算方法。通過計算機仿真得到不同情況下電液比例閥的壓降值,研究了油液流經(jīng)電液比例閥的壓降特性,并分析了電液比例閥閥口流量系數(shù)。應(yīng)用理論計算和流場仿真結(jié)合的方法解析了電液比例閥的穩(wěn)態(tài)液動力,得到穩(wěn)態(tài)液動力特性曲線,對電液比例閥的控制研究具有一定的指導(dǎo)意義。詳細分析傳統(tǒng)挖掘機的工作原理及其部分功能回路,參照ZTS16電液比例閥組成的閥控單元以及挖掘機的性能參數(shù)搭建了挖掘機液壓控制模塊系統(tǒng)的AMEsim模型,驗證了挖掘機的液壓控制模塊系統(tǒng)在操作過程中實現(xiàn)流量再生以及流量優(yōu)先功能的可能性。本文通過對ZTS16電液比例閥特性的研究,優(yōu)化了電液比例閥的結(jié)構(gòu)、確保實現(xiàn)精確化控制流量、降噪、節(jié)能以及準確匹配閥芯驅(qū)動系統(tǒng)等特性,為研究提供了一定的理論指導(dǎo)。為研究電液比例閥的應(yīng)用和特性找到了一條新的思路,縮短了研發(fā)周期,很大程度上降低了電液比例閥研制的成本,也為比例閥的研究設(shè)計提供了理論參考。
[Abstract]:With the rapid development of China's economy, the construction machinery industry is developing rapidly, but the hydraulic system of industrial machinery has put forward higher requirements for the design and development of the hydraulic system in the aspect of control. The electro-hydraulic proportional valve has the advantages of high control precision and high speed, and has been widely used in construction machinery. At one time, the development of electro-hydraulic proportional valve was raised in China. However, the lack of understanding of the internal flow characteristics of valve body is a short handle that restricts the development of electro-hydraulic proportional valve, which makes the technology lag behind, so the research and development has been stuck in the imitation stage. In this paper, the method of combining theoretical analysis with numerical simulation is used to make up for the shortage of the development of electro-hydraulic proportional valve in China. The characteristics of Eaton ZTS16 electro-hydraulic proportional valve are studied in depth, and its application in excavator is discussed. It provides some theoretical basis for the development and application of electro-hydraulic proportional valve. In this paper, a three-dimensional model of the internal flow field of ZTS16 electro-hydraulic proportional valve is established. The model is meshed with ICEM CFD software. The pressure field and velocity field of the electro-hydraulic proportional valve are analyzed based on the computational fluid dynamics analysis software Fluent. The velocity vector field and turbulent kinetic energy field are analyzed and the flow characteristics inside the electro-hydraulic proportional valve are described in detail. The over flow area of electro-hydraulic proportional valve is analyzed and calculated by geometric analysis method, and the calculation method of overcurrent area is determined. The pressure drop of electro-hydraulic proportional valve under different conditions was obtained by computer simulation. The pressure drop characteristics of oil flow through electro-hydraulic proportional valve were studied and the flow coefficient of electro-hydraulic proportional valve outlet was analyzed. The steady-state hydraulic power of electro-hydraulic proportional valve is analyzed by using the method of theoretical calculation and flow field simulation, and the steady-state hydraulic dynamic characteristic curve is obtained, which is of certain guiding significance to the study of electro-hydraulic proportional valve control. The working principle and some functional circuits of the traditional excavator are analyzed in detail. The AMEsim model of the hydraulic control module system of the excavator is built according to the valve control unit composed of the ZTS16 electro-hydraulic proportional valve and the performance parameters of the excavator. It is proved that the hydraulic control module system of excavator can realize flow regeneration and flow priority function during operation. Through the study of the characteristics of ZTS16 electro-hydraulic proportional valve, the structure of electro-hydraulic proportional valve is optimized to ensure accurate flow control, noise reduction, energy saving and accurate matching of valve core drive system, which provides a certain theoretical guidance for the research. A new way of thinking is found for studying the application and characteristics of electro-hydraulic proportional valve, which shortens the research and development cycle, reduces the cost of the development of electro-hydraulic proportional valve to a great extent, and provides a theoretical reference for the research and design of proportional valve.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH137.52

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