ISSN   1004-0595

CN  62-1224/O4

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矿物粉尘环境下矿井缠绕提升钢丝绳振动磨损特性研究

Vibration-Worn Characteristics of Winding Hoisting Wire Rope in Mine under the Environment of Mineral Dust

  • 摘要: 针对矿物粉尘易黏附于具有润滑保护的矿井缠绕提升钢丝绳表面而影响其接触磨损过程问题,利用自制缠绕提升钢丝绳振动磨损测试平台,分析矿井中常见矿物粉尘(煤炭颗粒和矿石颗粒)对缠绕接触钢丝绳间的摩擦学参数演化规律,并揭示其对钢丝绳磨损过程的干扰机制,以期为矿井提升系统的运维及延长钢丝绳使用寿命提供基础数据支撑. 结果表明:随着煤炭颗粒体积分数从10%增至40%,钢丝绳在相对稳定阶段的平均摩擦系数从0.158增至0.173,而颗粒尺寸的增大则使其呈现出相反的变化趋势;此外,随着煤炭颗粒体积分数不断增加,钢丝绳磨损表面C元素含量越来越多,黏附效应越来越严重,且剥层现象也越来越明显;随着矿石颗粒体积分数增至40%,钢丝绳摩擦系数增至0.157,磨损深度增至120.4 µm,且相比于煤炭颗粒,钢丝绳摩擦系数曲线更加平稳,而颗粒尺寸则与摩擦系数和磨损深度负相关;矿石颗粒浓度的增加及尺寸的减小均导致钢丝绳接触表面磨粒磨损程度更加严重.

     

    Abstract: In view of the fact that deep mining has gradually become the normal state of coal resources development in China, as the "throat" connecting the ground and underground, the mine hoisting equipment will develop in the direction of ultra-deepening and large-scale, and the winding hoist with multi-rope and multi-layer structure will gradually become the best choice for deep coal mining. However, mineral dust is easy to adhere to the surface of hoisting wire rope with lubricating protection, thus affecting the normal lubricating state of wire rope, and then interfering with its winding contact process on the drum. Additionally, the longitudinal vibration is inevitable due to the time-varying length of hoisting wire rope and the fluctuation of acceleration during service, which has an impact on the friction and wear performance between winding contact wire ropes. Therefore, exploring the influence of mineral dust on the vibration-worn characteristics of winding hoisting wire rope can provide the theoretical support for the operation and maintenance of the mine hoisting system serving in the environment of harsh dust. The vibration-worn test platform of wire rope was designed and built firstly in this thesis according to the winding contact form of mine hoisting wire rope. Then, taking the two kinds of mineral dusts, coal particle and ore particle, which were commonly found in mine, as examples, the vibration-worn tests of winding hoisting wire ropes with different particle parameters (concentration and size of particle) were carried out with the help of the platform, and the evolution of tribological parameters of wire rope was analyzed. Finally, the interference mechanism of two kinds of mineral dusts on the hoisting wire rope was obtained according to the surface wear morphology and element content of wire rope. The results showed that the average friction coefficient of wire rope increased from 0.158 to 0.173 in the relatively stable stage with the increase of volume fraction of coal particle from 10% to 40%, while the increase of size of particle made it show an opposite change trend, and the change trend of maximum temperature rise in the wind-out region of wire rope corresponded to its friction coefficient and fluctuates within 3 ℃ basically. The wear depth of wire rope increased to 117.7 μm with the volume fraction of coal particle increasing to 40%, while the size of particle had little influence on the wear. In addition, the content of C element on the worn surface of wire rope was increasing, the adhesion effect was becoming more and more seriously, and the delamination phenomenon was becoming more and more obviously with the increasing volume fraction of coal particle. Therefore, a certain amount of coal particles mixed into the lubricating grease would have a negative impact on the lubricating state between winding contact wire ropes, accelerating their wear, and the concentration of particle had a greater impact. For ore particle, the friction coefficient of wire rope increased to 0.157 and the wear depth increased to 120.4 µm with the volume fraction gradually increasing to 40%, and the curve of friction coefficient of wire rope was smoother than that for coal particle, while the size of particle was negatively correlated with the friction coefficient and the wear depth. The maximum temperature rose of wire rope in the wind-out region under the interference of ore particle mainly fluctuates within 2 ℃. Moreover, the increase of concentration and the decrease of size of ore particle led to more serious abrasive wear on the contact surface of wire rope. Therefore, the ore particle mixed with lubricating grease would destroy the lubricating state between winding contact wire ropes and accelerate their surface cutting wear.

     

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