不同工况对含夹矸煤岩截齿磨损深度影响模拟研究

Simulation study on the influence of different working conditions on the wear depth of coal and rock picks containing gangue

为了研究不同工况对截齿截割含夹矸煤岩的磨损深度影响规律,建立截齿-夹矸煤岩耦合的有限元模型,模拟含夹矸煤岩截齿截割过程,探究截齿应力分布、温度分布与磨损深度的关联程度,采用正交试验法分析转速、牵引速度和安装角对截齿磨损深度的影响规律。研究结果表明:在模拟试验参数范围内,截齿应力分布和温度分布影响截齿磨损深度的大小,且截齿应力、温度与截齿磨损深度呈正相关性;相比于不含夹矸煤岩,含夹矸煤岩截齿应力、温度和磨损深度更大;随着截齿牵引速度的增加,截齿齿尖前刀面磨损深度呈增大趋势;随着截齿转速的增加,截齿齿尖前刀面磨损深度呈减小趋势;随着安装角的增大,磨损深度呈先减小后增大的趋势。研究结果可以有效提高采煤机截割性能及效率。

In order to study the influence of different working conditions on the wear depth of the pick cutting coal and rock containing gangue,a finite element model of the pick-gangue coupling is established to simulate the cutting process of the pick cutting coal and rock containing gangue,and to explore the correlation between the stress distribution,temperature distribution and the wear depth of the pick.Orthogonal test method is used to analyze the influence of rotating speed,traction speed and installation angle on the wear depth of pick.The results show that within the range of simulation test parameters,the stress distribution and temperature distribution of the pick affect the size of the wear depth of the pick,and the stress and temperature of the pick have a positive correlation with the wear depth of the pick.The stress,temperature and wear depth of pick of coal and rock containing gangue are greater than that of coal and rock without gangue.With the increase of the traction speed of the pick,the wear depth of the rake face of the pick tip increases.With the increase of the pick speed,the wear depth of the rake face of the pick tip decreases.With the increase of installation angle,the wear depth decreases first and then increases.The research results can effectively improve the cutting performance and efficiency of coal mining machines.