磁性提升机闸瓦的制备及摩擦学性能研究

发布时间：2018-12-12 18:13

【摘要】：矿井提升系统是煤矿生产的咽喉,而制动装置作为提升机最后一道也是最关键的安全保障设备,是提升机不可缺少的重要组成部分。闸瓦作为制动装置的重要部件材料,其摩擦学性能的优劣直接关系到提升系统的安全运行,从而对全矿生产乃至人员生命安全都产生重要影响。影响闸瓦材料摩擦学性能的因素很多,但其中最根本的因素应该还是材料本身的性能。因此,开发具有良好摩擦磨损性能的新型闸瓦材料,对于提高提升机制动系统的可靠性和安全性具有重要的实际意义。本文利用磁粉对传统提升机闸瓦材料进行改性,制备新型磁性提升机闸瓦,研究其摩擦磨损规律和机理。首先,选用钕铁硼和纳米四氧化三铁作为磁粉,并用偶联剂KH590对纳米四氧化三铁进行表面修饰,研究磁性提升机闸瓦的制备方法和性能测试方法;其次,采用配方均匀设计方法进行配方试验设计,并运用灰色关联度分析、模糊综合评判和层次分析法对所得的摩擦学试验结果进行综合评价,从而确认出试验最优配方;再次,对摩擦系数偏移性、摩擦系数稳定性和磨损率三个性能指标进行数据处理,求出配方与性能指标之间的数学关系,基于最佳性能原则,求出理论最优配方,并模拟矿井提升机实际工况开展最优配方的摩擦磨损性能试验研究;最后,开展摩擦学试验、磁性能测试和微观形貌及成分分析试验研究磁粉对闸瓦的作用机理和不同含量钕铁硼磁粉对磁性提升机闸瓦的摩擦磨损性能的影响规律及机理。研究结果表明,钕铁硼和纳米四氧化三铁混合磁粉能极大提高提升机闸瓦的摩擦磨损性能,使其能完全适应矿井提升机实际极端工况。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD534

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