Experiment Research On Wear Behavior Of Middle Trough Of Scraper Conveyor

The scraper conveyor is an indispensable transportation equipment in coal production.The length of service time affects the economic benefits of the coal mine.The middle trough is the core component of the scraper conveyor,and its working state directly determines the life of the scraper conveyor.Excessive wear of the middle trough caused failure of the scraper conveyor,resulting in serious coal mine losses.In order to explore the wear mechanism of the middle trough of the scraper conveyor,this paper uses the experimental analysis and finite element simulation technology to research the wear of the middle trough.In order to research the micro-friction and wear phenomena and regularity of the middle trough surface,a fractal model was used to generate the random rough surface,and a solid model with rough surface was obtained.Then the surface contact and sliding were simulated by finite element method.The actual contact surface of the rough surface is positively small and increases with increasing pressure,and the sliding speed only affects its volatility.The surface contact pressure distribution is not uniform,and the micro-protrusions are subjected to much greater pressure than the external load.Analysis of the stress field shows that during the sliding phase,the maximum stress is transferred from the surface to the subsurface,causing the internal wear to occur first.In order to research the wear law of the two grooves in the middle trough,the two-body metal grinding test was carried out by a pressure-regulating variable speed friction tester.Firstly,the relationship between the wear area of the sample surface and the wear stroke was analyzed.Then the effects of different materials,different pressures and different surface roughness on the friction coefficient were investigated.Then,the test was carried out under different loading pressures and sliding speeds,and the relationship between the material and the sliding speed of the middle trough was obtained.The wear of the middle trough increased almost linearly with the increase of pressure,with the increase of sliding speed.Increase first and then increase slowly.In addition,the wear resistance of the six middle trough materials under the same test conditions was compared.The results show that as the surface hardness of the material increases,the wear resistance increases,and the wear of different materials is negatively correlated with the surface hardness.In this paper,a variety of factors affecting the wear of the middle trough are analyzed.Three different metamorphic coal materials are selected,and industrial analysis and physical properties are determined.Through the ratio of vermiculite and water,the abrasives under different coal types,particle size,water content and enthalpy ratio were obtained.A single factor test was carried out on the abrasive wear tester to obtain the relationship between the wear of the middle trough and various factors.The results show that the deeper the metamorphism,the lower the wear resistance index of the coal has higher wear on the middle trough;the larger the grain size,the greater the wear of the middle trough;the wear of the middle trough wear increases with the niobium content And increase,as the water content increases,first slow down and then increase.In order to evaluate the influence of different influences on the wear of the middle trough,a six-factor and three-level L₁₈（3⁶）orthogonal test was designed and carried out.It was found that the water content,pressure and niobium rate had a significant effect on the middle trough wear,while coal type,particle size and The effect of sliding speed is not significant.After that,scanning electron microscope was used to investigate the wear surface morphology of the middle trough sample,and it was found that the wear mechanism under the condition of low water content was abrasive wear,which gradually changed into corrosion wear with the increase of water content.