本文選題：煤機裝備 + 液壓系統(tǒng)��； 參考：《太原理工大學》2017年碩士論文

【摘要】：液壓系統(tǒng)被廣泛應(yīng)用在煤機裝備中,是煤機裝備的重要組成部分,其可靠性水平直接決定整機的工作性能,進而影響煤炭開采的效率和企業(yè)的經(jīng)濟效益。所以,對煤機裝備液壓系統(tǒng)進行可靠性分析,發(fā)現(xiàn)系統(tǒng)的薄弱環(huán)節(jié),提出改進和預防故障發(fā)生的措施,提高系統(tǒng)的可靠性,對整機運行的穩(wěn)定性和安全性具有非常重要的實際意義。本文介紹了液壓系統(tǒng)的可靠性特征量,為煤機裝備液壓系統(tǒng)可靠性分析提供理論依據(jù)。接著對懸臂式掘進機液壓系統(tǒng)、支架液壓系統(tǒng)和采煤機調(diào)高液壓系統(tǒng)三種煤機裝備液壓系統(tǒng)進行分析研究。根據(jù)液壓系統(tǒng)可靠性相關(guān)理論,構(gòu)建了煤機裝備液壓系統(tǒng)的可靠性框圖,建立了液壓系統(tǒng)的可靠性數(shù)學模型。利用可靠性分析技術(shù)對煤機裝備液壓系統(tǒng)進行可靠性分析。以懸臂式掘進機為例,對其液壓系統(tǒng)進行故障模式、影響及危害性分析(FMECA),找出系統(tǒng)的重要部分及薄弱環(huán)節(jié),為評價和改進系統(tǒng)提供重要依據(jù)。根據(jù)對支架液壓系統(tǒng)故障的統(tǒng)計以及故障樹分析(FTA)理論,建立了支架液壓系統(tǒng)的故障樹,使故障模式之間的邏輯關(guān)系更加清晰,便于尋找故障發(fā)生的最基本事件,改善和促進液壓系統(tǒng)的可靠性增長。根據(jù)對煤機裝備液壓系統(tǒng)的可靠性分析發(fā)現(xiàn),75%-80%的液壓系統(tǒng)故障是由于油液污染引起的,為提高液壓系統(tǒng)的可靠性,必須研究液壓系統(tǒng)的油液污染控制技術(shù)。本文闡述了油液污染的來源、種類以及危害。分析研究了四種基本的過濾系統(tǒng),建立了系統(tǒng)原理圖和污染控制數(shù)學方程。根據(jù)對煤機裝備液壓系統(tǒng)的分析,建立了煤機裝備液壓系統(tǒng)污染控制通用數(shù)學模型,研究數(shù)學方程中的相關(guān)因素對油液污染的影響。同時,根據(jù)對數(shù)學模型的分析,發(fā)現(xiàn)液壓系統(tǒng)油箱體積變小,能夠加快油液的凈化速率,有利于油液的污染控制,進而提出了油液污染控制小油箱理論,并建立了小油箱理論的系統(tǒng)原理圖,為油液污染控制技術(shù)的研究提供一定的理論依據(jù)。過濾器性能測試是液壓系統(tǒng)油液污染控制技術(shù)實施的關(guān)鍵。以支架液壓系統(tǒng)過濾器為例,通過多次通過試驗,研究污染控制方程中過濾比β對系統(tǒng)的影響,以及驗證不同標準的試驗粉末對試驗結(jié)果的影響。為控制油液污染和合理的評測過濾器提供參考,也為提高煤機裝備液壓系統(tǒng)的可靠性提供依據(jù)。
[Abstract]:Hydraulic system is widely used in coal machine equipment, which is an important part of coal machine equipment. Its reliability level directly determines the working performance of the whole machine, and then affects the efficiency of coal mining and the economic benefits of enterprises. Therefore, the reliability of the hydraulic system of coal machine equipment is analyzed, the weak links of the system are found, and the measures to improve and prevent the occurrence of faults are put forward to improve the reliability of the system. It is of great practical significance to the stability and safety of the whole machine. The reliability characteristic quantity of hydraulic system is introduced in this paper, which provides theoretical basis for reliability analysis of hydraulic system of coal machine equipment. Then the hydraulic system of cantilever roadheader, the hydraulic system of support and the hydraulic system of coal mining machine are analyzed and studied. According to the theory of hydraulic system reliability, the reliability block diagram of coal machine equipment hydraulic system is constructed, and the reliability mathematical model of hydraulic system is established. Reliability analysis technology is used to analyze the reliability of coal machine equipment hydraulic system. Taking the cantilever roadheader as an example, the failure mode, influence and harmfulness analysis of its hydraulic system are carried out, and the important parts and weak links of the system are found out, which provides an important basis for evaluating and improving the system. According to the fault statistics of hydraulic system of support and the theory of fault tree analysis (FTAA), the fault tree of hydraulic system of support is established, which makes the logical relation between fault modes more clear, and it is convenient to find the most basic event of fault. Improve and promote the reliability of hydraulic system. According to the reliability analysis of hydraulic system of coal machine equipment, it is found that 75% -80% of the faults of hydraulic system are caused by oil contamination. In order to improve the reliability of hydraulic system, it is necessary to study the oil pollution control technology of hydraulic system. This paper describes the sources, types and hazards of oil pollution. Four basic filtration systems are analyzed and studied. The system schematic diagram and pollution control mathematical equation are established. Based on the analysis of hydraulic system of coal machine equipment, a general mathematical model for pollution control of hydraulic system of coal machine equipment is established, and the influence of relevant factors in mathematical equation on oil pollution is studied. At the same time, according to the analysis of mathematical model, it is found that the volume of oil tank in hydraulic system becomes smaller, which can speed up the purification rate of oil, which is beneficial to the control of oil pollution, and then puts forward the theory of oil pollution control small tank. The system schematic diagram of small oil tank theory is established, which provides a theoretical basis for the study of oil pollution control technology. Filter performance test is the key to implement oil pollution control technology in hydraulic system. Taking the filter of hydraulic system of support as an example, the influence of filtration ratio 尾 in the pollution control equation on the system and the effect of different test powder on the test results are studied through many experiments. It provides a reference for controlling oil pollution and evaluating filter reasonably, and also provides the basis for improving the reliability of hydraulic system of coal machine equipment.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD40

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