本文關(guān)鍵詞： 電液比例方向閥 流場分析 液動力 液壓沖擊　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,電液控制系統(tǒng)的電液換向閥組都是采用開關(guān)閥,無法實現(xiàn)支架精確化的動作,同時高壓大流量下,開關(guān)閥的快速啟閉會產(chǎn)生液壓沖擊,這給系統(tǒng)元件帶來較大的危害,而電液比例控制技術(shù)可以很好的解決這些問題。因此,大流量高水基電液比例方向閥的研究十分必要。本文首先對高水基開關(guān)閥及油介質(zhì)比例閥的結(jié)構(gòu)原理進行了分析,結(jié)合高水基閥和油介質(zhì)比例閥設(shè)計理論,設(shè)計了一款大流量高水基電液比例方向閥�；贑FD技術(shù)對不同結(jié)構(gòu)參數(shù)下的電液比例方向閥流場特性進行了模擬,得到了合適的結(jié)構(gòu)參數(shù);針對高壓大流量工況下主閥進液閥芯液動力較大的問題,進行了液動力補償研究,研究表明,通過合理設(shè)置主閥進液閥芯頸部尺寸以及主閥進液閥套孔錐角的大小均可以顯著減小閥芯所受軸向穩(wěn)態(tài)液動力。建立了電液比例方向閥的數(shù)學(xué)模型,對電液比例方向閥一些關(guān)鍵參數(shù)進行了理論分析。結(jié)果表明:固定阻尼孔R、主閥芯復(fù)位彈簧、主閥芯控制腔面積等重要參數(shù)對電液比例方向閥穩(wěn)態(tài)及動態(tài)特性影響較大�；贏MESim建立了高水基電液比例方向閥控制系統(tǒng)模型,對其先導(dǎo)閥、主閥的穩(wěn)態(tài)及動態(tài)特性進行了研究。結(jié)果表明:在輸入電流信號中疊加顫振信號可以顯著改善先導(dǎo)閥的控制特性(輸入電流-輸出壓力特性);先導(dǎo)閥復(fù)位彈簧剛度越大,先導(dǎo)閥負載特性(壓力-流量特性)越差;固定阻尼孔R直徑越大,先導(dǎo)閥輸出壓力階躍響應(yīng)超調(diào)量越小,響應(yīng)越平穩(wěn)。主閥進液閥芯復(fù)位彈簧剛度越大,進液閥芯位移階躍響應(yīng)超調(diào)量越小,穩(wěn)定性越好;直線電流信號輸入方案下,進液閥芯開啟時間越長,產(chǎn)生的液壓沖擊越小,在不影響系統(tǒng)響應(yīng)時間時,拋物線電流信號輸入方案與直線電流信號輸入方案相比可以顯著降低液壓沖擊。本文綜合運用控制理論、計算流體動力學(xué)理論、計算機仿真,研究了高水基電液比例方向閥的流場特性、穩(wěn)態(tài)及動態(tài)特性,并對高水基電液比例方向閥進行了結(jié)構(gòu)設(shè)計與參數(shù)優(yōu)化。本文的研究成果能夠為煤礦液壓支架用大流量高水基電液比例方向閥的設(shè)計提供參考。
[Abstract]:At present, the electro-hydraulic directional valve group of the electro-hydraulic control system adopts the switch valve, which can not realize the accurate action of the support. At the same time, under the high pressure and large flow rate, the quick opening and closing of the switch valve will produce the hydraulic impact. This brings great harm to system components, and electro-hydraulic proportional control technology can solve these problems very well. It is very necessary to study the high flow and high water base electro-hydraulic proportional directional valve. Firstly, the structure principle of high water base switch valve and oil medium proportional valve is analyzed, and the design theory of high water base valve and oil medium proportional valve is combined. A large flow rate and high water base electro-hydraulic proportional directional valve is designed. The flow field characteristics of the electro-hydraulic proportional directional valve with different structure parameters are simulated based on CFD technology and the appropriate structural parameters are obtained. In order to solve the problem of large fluid power in the main valve core under the condition of high pressure and large flow rate, the study of hydraulic power compensation is carried out, and the research shows that. By reasonably setting the neck size of the main valve inlet valve core and the cone angle of the main valve inlet valve sleeve, the axial steady hydraulic power of the valve core can be significantly reduced. The mathematical model of electro-hydraulic proportional directional valve is established. Some key parameters of electro-hydraulic proportional directional valve are theoretically analyzed. The results show that the fixed damping hole R, the main valve core reset spring. The main valve core control cavity area and other important parameters have great influence on the steady and dynamic characteristics of electro-hydraulic proportional directional valve. Based on AMESim, the control system model of high water base electro-hydraulic proportional directional valve is established, and the pilot valve is obtained. The steady and dynamic characteristics of the main valve are studied. The results show that the flutter signal in the input current signal can significantly improve the control characteristics of the pilot valve (input current-output pressure characteristic). The greater the spring stiffness of the pilot valve is, the worse the load characteristic (pressure-flow characteristic) of the pilot valve is. The larger the R diameter of the fixed damping hole, the smaller the output pressure step response overshoot of the pilot valve, and the more stable the response. The larger the spring stiffness of the main valve inlet valve is, the smaller the displacement step response overshoot quantity is. The better the stability; Under the linear current signal input scheme, the longer the valve core opening time, the smaller the hydraulic impact, when the system response time is not affected. Compared with the linear current signal input scheme, the parabolic current signal input scheme can significantly reduce the hydraulic shock. In this paper, the control theory, computational fluid dynamics theory and computer simulation are used synthetically. The characteristics of flow field, steady state and dynamic state of high water base electro-hydraulic proportional directional valve are studied. The structure design and parameter optimization of high water base electro-hydraulic proportional directional valve are carried out. The research results in this paper can provide a reference for the design of high flow and high water base electro-hydraulic proportional directional valve for coal mine hydraulic support.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH137.52

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