摩擦提升机衬垫高速滑动摩擦热损伤行为研究
发布时间：2018-08-07 09:20
【摘要】：多绳摩擦式提升机是现代矿井提升运输的关键装备之一,其安全可靠运行的关键在于钢丝绳与摩擦衬垫之间是否具有足够的摩擦力及摩擦衬垫的耐磨损性能是否良好。但由于钢丝绳与摩擦衬垫摩擦副所处环境、工况恶劣,连续运行时间长,经常会有滑绳事故发生,造成重大的经济损失和人员伤亡。本文在国家自然科学基金青年科学基金项目:“基于(火积)与移动元胞自动机的高速螺旋摩擦热损伤突变行为研究”(编号:51105361)的资助下,开展摩擦衬垫高速滑动热损伤行为的研究,致力于为减少大型矿井摩擦式提升机重大恶性高速打滑事故的发生提供理论基础与技术支撑。针对研究摩擦式提升机滑绳事故的问题,本文设计了一套可模拟提升机恶劣打滑工况的无接头钢丝绳与衬垫高速滑动摩擦试验系统,并采用理论建模及试验研究相结合的方法,掌握了提升机恶劣打滑工况下摩擦衬垫的温度场分布及变化规律、摩擦学性能表现及热损伤行为。其主要研究内容包括以下几个方面:首先,进行矿用增摩脂的流变性能、点接触条件下的成膜特性及摩擦性能和在钢丝绳衬垫摩擦副上应用效果的基础试验研究,为分析高速脂润滑条件下的衬垫摩擦学性能表现、热损伤行为提供依据;通过对衬垫材料进行激光闪射法(LFA)、动态热机械分析(DMA)、热重分析(TGA)及差示扫描量热分析(DSC)等测试,获得衬垫材料的热物、热机性能,为后续进行的衬垫温度场数值仿真提供基础数据。其次,对摩擦衬垫与钢丝绳螺旋接触特性进行分析,获得任意时刻的钢丝绳与衬垫多点接触的无变形表面间隙的离散形式表达;在此基础上,建立衬垫绳槽表面接触压力求解模型,将表面压力分布转化为热流密度形式的热源,继而建立多移动热源的温度场模型;接着使用多重网格法循环求解离散时刻点下的压力分布及衬垫的温度场;然后对比分析不同温度场求解方案的结果以及进行温度场分布规律及其影响因素的相关研究。最后,通过开展钢丝绳与衬垫高速滑动摩擦试验,分别研究GDM326衬垫材料在干摩擦与脂润滑条件下的摩擦磨损特性;通过对比实测温升曲线与相应的仿真结果,验证衬垫温度场模型的正确性,然后借助多重网格法求解技术获得各试验工况条件下的摩擦表面温度分布情况;再通过分析各组试验后的衬垫摩擦表面宏观和微观损伤形貌,研究干摩擦与脂润滑条件下的衬垫热损伤行为和损伤机理。
[Abstract]:Multi-rope friction hoist is one of the key equipment for modern mine hoisting and transportation. The key to its safe and reliable operation is whether there is enough friction force between wire rope and friction pad and whether the wear resistance of friction pad is good. However, because of the environment of the steel wire rope and friction pad friction pair, the working condition is bad, the continuous operation time is long, the slippery rope accident often occurs, resulting in the heavy economic loss and casualties. This paper is supported by the Youth Science Foundation of the National Natural Science Foundation of China: "Research on the abrupt behavior of high speed spiral friction and thermal damage based on fire product and mobile cellular automata" (No.: 51105361). The research on the thermal damage behavior of friction liners at high speed is carried out in order to provide theoretical basis and technical support for reducing the occurrence of major malignant high speed slip accidents of friction hoists in large mines. In order to solve the problem of sliding rope accident of friction hoist, this paper designs a high-speed sliding friction test system without wire rope and liner, which can simulate the bad sliding condition of hoist, and adopts the method of theoretical modeling and experimental study. The temperature field distribution and variation law, tribological performance and thermal damage behavior of friction gasket under bad sliding condition of hoist are mastered. The main research contents include the following aspects: firstly, the rheological properties of mineral friction grease, the film forming characteristics and friction properties under point contact condition and the application effect on wire rope liner friction pair are studied. In order to analyze the tribological performance and thermal damage behavior of gasket under high speed grease lubrication, the thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) of liner materials were measured by (LFA), dynamic thermo-mechanical analysis (DMA),) and differential scanning calorimetry (DSC). The thermal and thermal properties of the gasket material are obtained, which provide the basic data for the subsequent numerical simulation of the cushion temperature field. Secondly, the helical contact characteristics of friction liner and wire rope are analyzed, and the discrete expression of the non-deformed surface clearance of multi-point contact between wire rope and liner at any time is obtained. A solution model of contact pressure on the surface of liner rope grooves is established. The surface pressure distribution is transformed into a heat source in the form of heat flux, and then the temperature field model of multiple moving heat sources is established. Then the pressure distribution and the temperature field of the gasket at discrete time point are calculated by using the multi-grid method, and the results of different temperature field solutions are compared and analyzed, as well as the related research on the temperature field distribution law and its influencing factors. Finally, the friction and wear characteristics of GDM326 liner under dry friction and grease lubrication were studied by high speed sliding friction test of wire rope and liner, and the measured temperature rise curve and corresponding simulation results were compared. Verify the correctness of the cushion temperature field model, and then obtain the friction surface temperature distribution under various test conditions by using the multi-grid method, and then analyze the macroscopic and microscopic damage morphology of the cushion friction surface after each test. The thermal damage behavior and mechanism of gasket under dry friction and grease lubrication were studied.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TD534
[Abstract]:Multi-rope friction hoist is one of the key equipment for modern mine hoisting and transportation. The key to its safe and reliable operation is whether there is enough friction force between wire rope and friction pad and whether the wear resistance of friction pad is good. However, because of the environment of the steel wire rope and friction pad friction pair, the working condition is bad, the continuous operation time is long, the slippery rope accident often occurs, resulting in the heavy economic loss and casualties. This paper is supported by the Youth Science Foundation of the National Natural Science Foundation of China: "Research on the abrupt behavior of high speed spiral friction and thermal damage based on fire product and mobile cellular automata" (No.: 51105361). The research on the thermal damage behavior of friction liners at high speed is carried out in order to provide theoretical basis and technical support for reducing the occurrence of major malignant high speed slip accidents of friction hoists in large mines. In order to solve the problem of sliding rope accident of friction hoist, this paper designs a high-speed sliding friction test system without wire rope and liner, which can simulate the bad sliding condition of hoist, and adopts the method of theoretical modeling and experimental study. The temperature field distribution and variation law, tribological performance and thermal damage behavior of friction gasket under bad sliding condition of hoist are mastered. The main research contents include the following aspects: firstly, the rheological properties of mineral friction grease, the film forming characteristics and friction properties under point contact condition and the application effect on wire rope liner friction pair are studied. In order to analyze the tribological performance and thermal damage behavior of gasket under high speed grease lubrication, the thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) of liner materials were measured by (LFA), dynamic thermo-mechanical analysis (DMA),) and differential scanning calorimetry (DSC). The thermal and thermal properties of the gasket material are obtained, which provide the basic data for the subsequent numerical simulation of the cushion temperature field. Secondly, the helical contact characteristics of friction liner and wire rope are analyzed, and the discrete expression of the non-deformed surface clearance of multi-point contact between wire rope and liner at any time is obtained. A solution model of contact pressure on the surface of liner rope grooves is established. The surface pressure distribution is transformed into a heat source in the form of heat flux, and then the temperature field model of multiple moving heat sources is established. Then the pressure distribution and the temperature field of the gasket at discrete time point are calculated by using the multi-grid method, and the results of different temperature field solutions are compared and analyzed, as well as the related research on the temperature field distribution law and its influencing factors. Finally, the friction and wear characteristics of GDM326 liner under dry friction and grease lubrication were studied by high speed sliding friction test of wire rope and liner, and the measured temperature rise curve and corresponding simulation results were compared. Verify the correctness of the cushion temperature field model, and then obtain the friction surface temperature distribution under various test conditions by using the multi-grid method, and then analyze the macroscopic and microscopic damage morphology of the cushion friction surface after each test. The thermal damage behavior and mechanism of gasket under dry friction and grease lubrication were studied.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TD534
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