采掘机械截齿退化机制研究

doi:10.11799/ce202209030

摘要/Abstract

摘要： 为探究采掘机械截齿的退化机制，根据截齿的失效形式，通过考虑自然磨损退化、冲击瞬时退化以及冲击持续时间内的变速率加速退化，建立了随机载荷冲击下截齿竞争失效的退化模型，研究了磨损退化和随机载荷冲击对截齿失效的综合影响。利用工程数据对截齿的退化模型进行了数值实验和有效性分析。结果表明，实验条件下截齿的平均寿命仅为6.45d，为采掘机械消耗最大的配件|考虑持续冲击和变速率加速退化的截齿竞争失效退化模型更符合工程实际，为截齿的可靠性评估、维修决策和备件管理提供了理论基础。

关键词: 采掘机械截齿, 竞争失效, 退化模型, 加速退化, 冲击持续时间, 变速率

Abstract: During the mining process, the coal and rock are regarded as normal working loads, the gangue and faults being regarded as random shock loads. The pick can be affected by natural wear and tear caused by the coal and rock and load shocks caused by the gangue and faults—that is, the result of the competing influence of soft failure caused by natural wear and tear and hard failure caused by random load shocks. Because the gangue and faults have a certain volume and hardness, a random load shock may last for a certain period of time, producing different acceleration effects on the pick wear under different hardness. The degradation model of pick competing failure under random load shocks was established by considering the natural wear degradation, instantaneous shock degradation, and accelerated degradation at changing rates during shock periods. The results showed that the competing failure degradation model of the pick considering continuous shocks and a changing degradation rate was more in line with engineering practice, which provides a theoretical basis for pick reliability assessment, maintenance decision and spare parts management.

中图分类号:

TD421

秦彦凯, 张永飞, 张晓红, 等. 采掘机械截齿退化机制研究[J]. 煤炭工程, 2022, 54(9): 168-174.

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