直行截割下采煤机截割部齿轮箱动态特性实验分析

目前对采煤机截割部齿轮箱振动特性的研究主要通过理论模型，但这些研究缺乏实验验证.通过实验室模拟井下真实的采煤机直行截割过程来分析齿轮箱非线性振动特性.以振动烈度为评判标准，与已有研究所得理论计算结果进行对比.以截深、牵引速度及煤岩体硬度为实验变量，分析它们对齿轮箱振动的影响规律.分析了煤岩体硬度突变冲击、拍振现象和电机启动冲击等影响齿轮箱可靠性的恶劣工况及其影响因素.本实验所得到的数据及相关结论可以为采煤机齿轮箱理论模型及可靠性分析提供参考和对照.

Experimental Research of Dynamic Characteristics for Long Wall Shearer Cutting Unit Gearbox in Straight Line Cutting

The vibration characteristics of a long wall shearer’s cutting unit gearbox (SCUG) are mostly investigated by theoretical models， however， these results are lacking in experimental validation. For validating theoretical results and investigating some nonlinear dynamic characteristics of SCUG， a dedicated test set-up which can simulate the real coal mining process is developed to operate the long wall shearer in loaded and unloaded working conditions. Vibration severity is taken as a comparison standard of theoretical and experimental results. Cutting depth， traction speed and coal hardness are considered as the experimental variables and the contributions of these factors to the vibration of SCUG are ranked. Coal hardness mutation， beat vibration phenomenon and motor run-up impact which can contribute to the resonance and fatigue damage of SCUG are analyzed in the experiment， and the impact of drum load on them is also quantified. The data obtained by the experiment and the relevant conclusions may provide a certain reference for the correct understanding of vibration response and reliability analysis of SCUG.