【摘要】：礦井提升系統(tǒng)是煤礦生產(chǎn)的咽喉,而制動裝置作為提升機最后一道也是最關(guān)鍵的安全保障設(shè)備,是提升機不可缺少的重要組成部分。閘瓦作為制動裝置的重要部件材料,其摩擦學(xué)性能的優(yōu)劣直接關(guān)系到提升系統(tǒng)的安全運行,從而對全礦生產(chǎn)乃至人員生命安全都產(chǎn)生重要影響。影響閘瓦材料摩擦學(xué)性能的因素很多,但其中最根本的因素應(yīng)該還是材料本身的性能。因此,開發(fā)具有良好摩擦磨損性能的新型閘瓦材料,對于提高提升機制動系統(tǒng)的可靠性和安全性具有重要的實際意義。本文利用磁粉對傳統(tǒng)提升機閘瓦材料進行改性,制備新型磁性提升機閘瓦,研究其摩擦磨損規(guī)律和機理。首先,選用釹鐵硼和納米四氧化三鐵作為磁粉,并用偶聯(lián)劑KH590對納米四氧化三鐵進行表面修飾,研究磁性提升機閘瓦的制備方法和性能測試方法;其次,采用配方均勻設(shè)計方法進行配方試驗設(shè)計,并運用灰色關(guān)聯(lián)度分析、模糊綜合評判和層次分析法對所得的摩擦學(xué)試驗結(jié)果進行綜合評價,從而確認出試驗最優(yōu)配方;再次,對摩擦系數(shù)偏移性、摩擦系數(shù)穩(wěn)定性和磨損率三個性能指標進行數(shù)據(jù)處理,求出配方與性能指標之間的數(shù)學(xué)關(guān)系,基于最佳性能原則,求出理論最優(yōu)配方,并模擬礦井提升機實際工況開展最優(yōu)配方的摩擦磨損性能試驗研究;最后,開展摩擦學(xué)試驗、磁性能測試和微觀形貌及成分分析試驗研究磁粉對閘瓦的作用機理和不同含量釹鐵硼磁粉對磁性提升機閘瓦的摩擦磨損性能的影響規(guī)律及機理。研究結(jié)果表明,釹鐵硼和納米四氧化三鐵混合磁粉能極大提高提升機閘瓦的摩擦磨損性能,使其能完全適應(yīng)礦井提升機實際極端工況。
[Abstract]:Mine hoisting system is the throat of coal mine production. As the last and most critical safety equipment of hoist, brake device is an indispensable part of hoist. As an important component material of brake device, the tribological performance of brake shoe is directly related to the safe operation of the lifting system, which has an important impact on the whole mine production and even the safety of human life. There are many factors affecting the tribological properties of brake shoe materials, but the most fundamental factor should be the properties of the materials themselves. Therefore, the development of a new type of brake shoe material with good friction and wear performance is of great practical significance for improving the reliability and safety of the hoist brake system. In this paper, a new type of magnetic hoist brake shoe was prepared by modifying the traditional brake shoe material with magnetic powder, and its friction and wear law and mechanism were studied. Firstly, NdFeB and nano-Fe _ 2O _ 4 were used as magnetic powder, and the surface modification of nano-Fe _ 2O _ 3 was carried out by coupling agent KH590, and the preparation method and performance test method of magnetic hoist brake shoe were studied. Secondly, the formula test design is carried out by the uniform formula design method, and the result of tribological test is evaluated synthetically by grey relational degree analysis, fuzzy comprehensive evaluation and analytic hierarchy process, so as to confirm the optimum formula of the test. Thirdly, the three performance indexes of friction coefficient deviation, friction coefficient stability and wear rate are processed, and the mathematical relationship between the formula and the performance index is obtained. Based on the best performance principle, the theoretical optimal formula is obtained. The friction and wear performance of the optimal formula is studied by simulating the actual working condition of mine hoist. Finally, tribological tests, magnetic performance tests and microscopic morphology and composition analysis tests were carried out to study the mechanism of magnetic powder acting on the brake shoe and the influence of different contents of NdFeB magnetic powder on the friction and wear properties of the brake shoe of magnetic hoist. The results show that the friction and wear properties of the brake shoe of the hoist can be greatly improved by the mixed magnetic powder of NdFeB and nano-Fe _ 2O _ 4, and it can fully adapt to the actual extreme working conditions of the mine hoist.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD534

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本文編號：2375063