基于三角模糊数判断矩阵的液压支架寿命评价方法

发布时间：2018-03-30 06:32

本文选题：液压支架　切入点：寿命　出处：《太原理工大学》2017年硕士论文

【摘要】：液压支架起着控制矿山压力、保证工作面空间安全的作用,是煤矿综采工作面最重要的设备之一。由于矿井里环境恶劣,工作强度高等因素导致设备故障发生率高,严重影响了工人的生命安全,同时极高的维修费用也给企业带来了很大的经济负担。现在主要是根据过煤量、使用年限、循环次数来决定设备是否报废,但是影响设备寿命的因素众多,采用该方法使很多本未达到使用年限的设备提前报废,给企业带来了损失。因此选择合适的指标及方法来评估液压支架的寿命,科学合理的进行支架的维护、报废,有着重要的工程意义。本文对液压支架结构部件进行详细的分析后,采用模糊层次分析法来评价液压支架寿命,提出了基于三角模糊数判断矩阵的权重计算方法。选择安全性指标、可靠性指标、经济性指标、技术性指标为量化指标,由此来建立糊综合评价的数学模型。安全性指标主要选择承载结构件的变形、焊缝开裂程度为依据。给出了设备承载体变形、开裂的测量方法,详细讨论了如顶梁、掩护梁等结构各部位的重要程度,就各个因素给出了不同的权重。对支架影响可靠性的因素讨论后,选择平均无故障工作时间(MTBF)和平均修复时间(MTTR)这两个指标为评价准则。经济性指标主要有超期服役年限、大修费用与原值比率决定。技术性指标选择支护强度对底板比压的适应性、支撑高度对煤层的适应性、大修状况、推移装置对煤层的适应性这四个主要指标来进行评价。随机选取了50架设备为样机,进行测量分析,用来验证构建的数学模型是否合理。本课题的结果对于提高液压支架的利用率,减少企业损失,以及更好的指导支架的更新具有重要的意义。
[Abstract]:Hydraulic support plays an important role in controlling mine pressure and ensuring space safety of coal face, and it is one of the most important equipments in fully mechanized coal mining face. It has seriously affected the safety of workers' lives, and at the same time, the extremely high maintenance costs have also brought a great economic burden to enterprises. Now, it is mainly based on the amount of coal used, the number of years of service, and the number of cycles to determine whether the equipment is scrapped or not. However, there are many factors that affect the life of the equipment. This method makes many equipments that have not reached the service life to be scrapped in advance, which brings losses to the enterprise. Therefore, the appropriate indexes and methods are chosen to evaluate the life of the hydraulic support. It is of great engineering significance to maintain and scrap the support scientifically and reasonably. After detailed analysis of the structural components of the hydraulic support, fuzzy analytic hierarchy process is used to evaluate the life of the hydraulic support. The weight calculation method based on triangular fuzzy number judgment matrix is put forward. The safety index, reliability index, economic index and technical index are selected as quantitative indexes. A mathematical model for comprehensive evaluation of paste is established. The safety index is mainly based on the deformation of bearing structure and the degree of cracking of weld seam. The measuring method of deformation and cracking of equipment bearing body is given, and the method of measuring such as top beam is discussed in detail. The weight of different factors is given for the important degree of the cover beam and other parts of the structure. After the discussion of the factors affecting the reliability of the support, The average failure free working time (MTBF) and the average repair time (MTTRT) are selected as the evaluation criteria. The ratio of overhauling cost to original value is determined. Technical index selection support strength adaptability to floor specific pressure, support height to coal seam adaptability, overhaul condition, To evaluate the adaptability of the bed load device to the coal seam, 50 sets of equipment were randomly selected as the prototype for measurement and analysis. The result of this paper is of great significance to improve the utilization rate of hydraulic support, reduce the loss of enterprises, and better guide the renewal of support.
【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】：TD355.4

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