本文選題：液壓挖掘機 + 多路閥　； 參考：《中南大學(xué)》2014年碩士論文

【摘要】：多路閥是將兩個以上的閥塊組合在一起,操縱多個執(zhí)行元件運動的集成閥,液控先導(dǎo)閥是控制其閥芯換向的關(guān)鍵元件。作為液壓挖掘機的核心元件,兩者性能的好壞,直接決定整機的操控性能。 本文以中型液壓挖掘機動臂聯(lián)和鏟斗聯(lián)為研究對象,深入分析多路閥和先導(dǎo)閥的結(jié)構(gòu)原理,總結(jié)出評價多路閥操控性的指標：先導(dǎo)閥—多路閥綜合特性曲線。研究多路閥操控性能,及改善操控性的方案,論文的主要工作如下： (1)建立多路閥閥芯位移特性和閥口流量特性的數(shù)學(xué)模型。深入分析先導(dǎo)閥特性曲線、多路閥閥芯位移特性曲線以及閥口流量曲線之間的聯(lián)系,從而確定先導(dǎo)閥位移和多路閥閥口流量的關(guān)系,即先導(dǎo)閥—多路閥綜合特性曲線,以此作為評價多路閥操控性的指標。 (2)基于AMESim和Fluent平臺,對現(xiàn)有鏟斗聯(lián)和動臂聯(lián)閥進行仿真分析,得到綜合特性曲線。并從線性有效控制百分比、線性度和流量分辨率三個方面對綜合曲線進行評價。結(jié)果表明現(xiàn)有多路閥具有調(diào)速區(qū)間窄,流量微調(diào)性能和流量分辨率差等缺點。針對這些問題,通過調(diào)整先導(dǎo)減壓彈簧和多路閥復(fù)位彈簧的剛度和預(yù)緊力來增加調(diào)速區(qū)間,并通過提高多路閥過流面積曲線梯度來改善流量微調(diào)性能。 (3)以中型液壓挖掘機為試驗平臺進行相關(guān)試驗,包括先導(dǎo)壓力測試、動臂和斗桿的單動作測試,將實驗數(shù)據(jù)和仿真結(jié)果對比,驗證仿真分析的正確性和優(yōu)化方案的可行性。
[Abstract]:Multi-way valve is an integrated valve which combines two or more valve blocks and controls the movement of multiple actuator. The hydraulic pilot valve is the key element to control the valve core reversing. As the core component of hydraulic excavator, the performance of both directly determines the control performance of the whole machine. Taking the arm connection and bucket connection of medium hydraulic excavator as the research object, the structure principle of multi-way valve and pilot valve is analyzed in depth, and the index of evaluating the maneuverability of multi-way valve is summarized: the comprehensive characteristic curve of pilot valve and multi-way valve. The main work of this paper is as follows: A mathematical model of valve core displacement characteristics and valve flow characteristics is established. The relationship among pilot valve characteristic curve, multi-way valve core displacement characteristic curve and valve port flow curve is analyzed in order to determine the relationship between pilot valve displacement and multiway valve opening flow, that is, pilot valve-multiway valve comprehensive characteristic curve. This is used as an index to evaluate the maneuverability of multiway valves. 2) based on AMESim and Fluent platform, the existing bucket and arm coupling valves are simulated and analyzed, and the comprehensive characteristic curves are obtained. The synthetic curve is evaluated from three aspects: linear effective control percentage, linearity and flow resolution. The results show that the existing multi-way valves have the disadvantages of narrow speed range, poor flow fine-tuning performance and poor flow resolution. To solve these problems, the stiffness and preload of the pilot relief spring and the reset spring are adjusted to increase the speed regulation interval, and the flow fine-tuning performance is improved by increasing the gradient of the flow area curve of the multi-way valve. This paper takes medium hydraulic excavator as the test platform to carry out related tests, including pilot pressure test, single action test of moving arm and bucket rod, compares the experimental data with the simulation results, and verifies the correctness of the simulation analysis and the feasibility of the optimization scheme.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU621;TH137

【參考文獻】

相關(guān)期刊論文 前10條

1 孫書鴻;多路換向閥的控制[J];工程機械;1980年02期

2 文百行 ,李必信;先導(dǎo)閥靜態(tài)和動態(tài)特性計算[J];工程機械;1981年05期

3 陳正利;我國挖掘機行業(yè)的形成與發(fā)展、現(xiàn)狀及前景[J];建設(shè)機械技術(shù)與管理;2004年11期

4 王素;胡國清;;電磁比例多路換向閥在微調(diào)區(qū)間的靜態(tài)特性及仿真[J];集美大學(xué)學(xué)報(自然科學(xué)版)網(wǎng)絡(luò)版(預(yù)印本);2009年03期

5 高殿榮,侯桂慶,楊林杰,姜萬錄;進口節(jié)流式滑閥內(nèi)流場的有限元計算與PIV研究[J];機械工程學(xué)報;2004年06期

6 賀小峰,黃國勤,楊友勝,李壯云;球閥閥口流量特性的試驗研究[J];機械工程學(xué)報;2004年08期

7 楊華勇,曹劍,徐兵,吳根茂;多路換向閥的發(fā)展歷程與研究展望[J];機械工程學(xué)報;2005年10期

8 郭勇;陳勇;何清華;羅偉;;小型液壓挖掘機節(jié)流系統(tǒng)主閥芯節(jié)流口計算[J];建筑機械;2006年17期

9 羅艷蕾;邱雪;陳倫軍;;基于Fluent多路閥中壓力補償閥流場的仿真分析[J];機床與液壓;2012年21期

10 郭q，

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