Experimental Study On The Influence Of Staggering On Friction And Wear Of The Carbon Strip With Electric Current

High-speed railway has attracted much attention of many countries due to the advantages of carrying capacity,low cost,high safety and so on.The high-speed railway has become an important way to improve the speed of transportation,which couldn't be replaced in people's daily life.In this paper,a series of experimental tests are studied on a block-on-ring type high-speed electric sliding test machine,and the influence of staggering on the sliding electric contact characteristics of pure carbon strip has been studied.The test work and relevant results are presented as follows:1.In the presence of electric current,the discharge frequency,arc discharge energy and contact resistance increase with the increase of staggering,and the current-carrying efficiency decreases with the increase of staggering.2.In the presence of electric current,the temperature rise of the carbon strip without staggering is lower than that with staggering,and when the carbon strip slides against the contact wire with staggering,the temperature rise of the carbon strip decreases with the increase of staggering.In the absence of electric current,the temperature rise of the carbon strip decreases with the increase of staggering.3.Under the medium or low speed condition,the wear rate of the carbon strip without staggering is far lower than that with staggering,and when the carbon strip slides against the contact wire with staggering,the wear rate of the carbon strip decreases with the increase of staggering.Under the high speed condition,the wear rate of the carbon strip without staggering is increased significantly.The average depth of wear scar decreases with the increase of staggering.4.Under the high speed condition,the arc erosion of the non-contact area is more serious than the contact area without staggering.Under the low speed condition,the arc erosion of the carbon strip with staggering is more serious than that without staggering.5.The current-carrying efficiency of a pantograph-catenary system increases with the increase of the normal force,and decreases with the increase of the sliding speed.Under the same condition of electric current,the arc discharge energy decreases with the increase of the current-carrying efficiency,and when the current-carrying efficiency decreases,the current waveform is distorted and the arc discharge frequency increases.Under the same conditions of electric current and staggering,the temperature rise,wear rate and contact resistance decrease with the increase of the current-carrying efficiency.6.Under the same conditions of electric current and staggering,different current-carrying efficiencies correspond to different wear morphologies of the carbon strip.SEM observations of the worn scars show that the wear of the carbon strip is mainly mechanical wear accompanied by a slight arc ablation phenomenon,when the current-carrying is higher(?=83.20%).However,when the current-carrying is low(?=68.92%),the arc erosion of the carbon strip is very serious accompanying by obvious ablation pits.