煤机装备液压系统可靠性及其油液污染控制技术研究

发布时间：2018-05-15 09:08

本文选题：煤机装备 + 液压系统　；参考：《太原理工大学》2017年硕士论文

【摘要】：液压系统被广泛应用在煤机装备中,是煤机装备的重要组成部分,其可靠性水平直接决定整机的工作性能,进而影响煤炭开采的效率和企业的经济效益。所以,对煤机装备液压系统进行可靠性分析,发现系统的薄弱环节,提出改进和预防故障发生的措施,提高系统的可靠性,对整机运行的稳定性和安全性具有非常重要的实际意义。本文介绍了液压系统的可靠性特征量,为煤机装备液压系统可靠性分析提供理论依据。接着对悬臂式掘进机液压系统、支架液压系统和采煤机调高液压系统三种煤机装备液压系统进行分析研究。根据液压系统可靠性相关理论,构建了煤机装备液压系统的可靠性框图,建立了液压系统的可靠性数学模型。利用可靠性分析技术对煤机装备液压系统进行可靠性分析。以悬臂式掘进机为例,对其液压系统进行故障模式、影响及危害性分析(FMECA),找出系统的重要部分及薄弱环节,为评价和改进系统提供重要依据。根据对支架液压系统故障的统计以及故障树分析(FTA)理论,建立了支架液压系统的故障树,使故障模式之间的逻辑关系更加清晰,便于寻找故障发生的最基本事件,改善和促进液压系统的可靠性增长。根据对煤机装备液压系统的可靠性分析发现,75%-80%的液压系统故障是由于油液污染引起的,为提高液压系统的可靠性,必须研究液压系统的油液污染控制技术。本文阐述了油液污染的来源、种类以及危害。分析研究了四种基本的过滤系统,建立了系统原理图和污染控制数学方程。根据对煤机装备液压系统的分析,建立了煤机装备液压系统污染控制通用数学模型,研究数学方程中的相关因素对油液污染的影响。同时,根据对数学模型的分析,发现液压系统油箱体积变小,能够加快油液的净化速率,有利于油液的污染控制,进而提出了油液污染控制小油箱理论,并建立了小油箱理论的系统原理图,为油液污染控制技术的研究提供一定的理论依据。过滤器性能测试是液压系统油液污染控制技术实施的关键。以支架液压系统过滤器为例,通过多次通过试验,研究污染控制方程中过滤比β对系统的影响,以及验证不同标准的试验粉末对试验结果的影响。为控制油液污染和合理的评测过滤器提供参考,也为提高煤机装备液压系统的可靠性提供依据。
[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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD40

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