Design And Optimization Of High Speed Grinding Device By Open Abrasive Belt For Eliminating High Speed Rail Wave

Due to the rapid development of Chinese high-speed railway and the continuous improvement of railway transportation capability,the problem of fatigue damage on the rail surface is becoming more and more serious.The wavy wear of rails seriously affects the safety and smoothness of train operation.Rail grinding plays an increasingly important role as an effective means to remove wavy wear.The existing rail grinding equipment mainly uses grinding wheels as grinding tools.In recent years,domestic and foreign countries have started to research the grinding technology of rail abrasive belts.Compared with the grinding of the grinding wheel,the belt grinding has the advantages of elastic grinding,high-efficiency grinding,fast grinding,and real-time updating of the belt.In this paper,based on the research of removing high speed wave grinding,combined with the existing rail grinding equipment,we designed a high-speed open belt grinding car and optimized the design structure based on analysis of statics,modes,and dynamics.The main research contents are:Firstly,based on the technical conditions of the rail grinding device assembly,high-speed rail profile,rail grinding and other grinding needs analysis,this paper designed the open belt grinding trolley structure,sand belt tensioning method,grinding head type and other programs.Combined with the analysis of the existing rail grinding mechanism,the detailed plan for the open belt sanding trolley was realized,and a three-dimensional digital model was established;on this basis,the operation mode of the open grinding trolley was analyzed,and the actual grinding operation belt replacement.Conditions,check and polish the structure size of the trolley,realize the initial optimization of the rail sanding trolley,and make the trolley meet the functional requirements of idleness,work and belt replacement.Secondly,the components of the important parts of the grinding trolley are analyzed,mainly including the center frame,the main frame of the trolley,the motor connecting shaft,the retractable pulley,the pressure grinding plate and other components.The ANSYS Workbench software is used to analyze the important components for statics.The stress and deformation displacement cloud diagrams of these important components under static loading are obtained.Based on the analysis results,the components with larger deformation are further optimized,and the total deformation displacement of the optimized components is verified.The analysis results show that the optimization After the parts can better meet the static requirements.Thirdly,the modal analysis of important components is carried out by ANSYS Workbench software,mainly including the center frame,the car main frame,the motor connection axis,the belt wheel,the press mill and so on.The first 6 modal frequencies of the important components are analyzed,and the natural frequencies are compared with the working vibration frequencies of a high speed rail line,and the frequency of the frequency is compared with the frequency of the operation of a high speed rail.The important components with close rate are optimized,and the modal frequency and static strength of the optimized structure are verified.After verification,the optimized structure can improve the static state of the structure,so that the desired requirements are better satisfied.Finally,combined with the above analysis of the polished trolley model,using the multi-body dynamics simulation software Simpack to establish a dynamic model of the grinding trolley;analyzing the dynamic performance of the straight line and the curve at different speeds under the grinding working conditions,mainly analyzing the dynamic performance.The learning performance includes:vertical vibration acceleration,lateral vibration acceleration,wheelset lateral force and derailment coefficient.The analysis result is compared with the rail vehicle dynamics index specified in GB/T17426-1998.The final result shows that the open track belt of the rail The kinetics of grinding the cart meets the design criteria.