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在环-块式试验机上进行纯碳滑板/铜银合金接触线载流摩擦磨损试验,通过改变转盘转速模拟高速列车弓网系统中碳滑板与接触线在电流为250A,相对滑动速度为160~350km·h-1时,不同相对滑动速度对弓网间的摩擦因数、载流效率、接触压力稳定性系数、电弧放电能量、碳滑板磨损率、碳滑板温升等参数的影响,分析了6个参数与相对滑动速度之间的相关性与不同工况下受电弓滑板的磨损形貌。分析结果表明:弓网间的摩擦因数、载流效率、接触压力稳定性系数随相对滑动速度的增大而降低,电弧放电能量、碳滑板磨损率和碳滑板温升随相对滑动速度的增大而增大;6个参数与相对滑动速度都呈强相关性,其中接触压力稳定性系数、电弧放电能量、磨损率和碳滑板温升与相对滑动速度正相关,Pearson系数分别为0.991、0.996、0.952、0.991,载流效率、摩擦因数与相对滑动速度速度负相关,Pearson系数分别为-0.990、-0.986;随着相对滑动速度的增大,碳滑板的磨损愈发严重,相对滑动速度超过250km·h-1后,碳滑板表面的裂纹显著增多且深度也明显增大;磨损前后碳滑板的能谱分析表明,碳滑板与接触线间材料的转移是双向的。
In the ring - block testing machine for pure carbon skateboard / copper-silver alloy contact line current friction and wear test, by changing the rotary speed of the simulated high-speed train arch system carbon bow and contact line at a current of 250A, the relative sliding speed of 160 ~ 350km · h-1, the effect of different relative sliding velocities on the friction factor, current carrying efficiency, contact pressure stability coefficient, arc discharge energy, carbon sliding wear rate and carbon slide temperature rise were analyzed. The correlation between the parameters and the relative sliding velocity and the wear morphology of the pantograph skateboard under different working conditions. The results show that the friction coefficient, current carrying efficiency and contact pressure stability coefficient decrease with the increase of relative sliding velocity. The arc discharge energy, carbon sliding wear rate and carbon sliding temperature increase with the increase of relative sliding velocity While the six parameters showed a strong correlation with the relative slip velocity. The contact pressure stability coefficient, arc discharge energy, wear rate and carbon slide temperature rise were positively correlated with the relative slip velocities. The Pearson coefficients were 0.991, 0.996, 0.952, 0.991, the current carrying efficiency, the friction coefficient and the relative sliding speed negative correlation, Pearson coefficients were -0.990, -0.986; with the relative sliding speed increases, the carbon skateboard wear more serious, the relative sliding speed of more than 250km · H-1, the crack on the surface of the carbon skateboard significantly increased and the depth increased significantly. The energy spectrum analysis of the carbon skateboard before and after wearing showed that the material transfer between the carbon skateboard and the contact line is bidirectional.