本文選題：液壓挖掘機(jī) + 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(gè)以上的閥塊組合在一起,操縱多個(gè)執(zhí)行元件運(yùn)動(dòng)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(jī)的核心元件,兩者性能的好壞,直接決定整機(jī)的操控性能。 本文以中型液壓挖掘機(jī)動(dòng)臂聯(lián)和鏟斗聯(lián)為研究對(duì)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(píng)價(jià)多路閥操控性的指標(biāo)：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(píng)價(jià)多路閥操控性的指標(biāo)。 (2)基于AMESim和Fluent平臺(tái),對(duì)現(xiàn)有鏟斗聯(lián)和動(dòng)臂聯(lián)閥進(jìn)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(gè)方面對(duì)綜合曲線進(jìn)行評(píng)價(jià)。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(diǎn)。針對(duì)這些問(wèn)題,通過(guò)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(lái)增加調(diào)速區(qū)間,并通過(guò)提高多路閥過(guò)流面積曲線梯度來(lái)改善流量微調(diào)性能。 (3)以中型液壓挖掘機(jī)為試驗(yàn)平臺(tái)進(jìn)行相關(guān)試驗(yàn),包括先導(dǎo)壓力測(cè)試、動(dòng)臂和斗桿的單動(dòng)作測(cè)試,將實(shí)驗(yàn)數(shù)據(jù)和仿真結(jié)果對(duì)比,驗(yàn)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(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU621;TH137

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