Structure Analysis And Optimization For Key Parts Of The Sand Removal Vehicle

In recent years,China's high-speed railway are developing rapidly and railway lines are increasing.However,the sandstorm disasters in some areas seriously threaten the operational safety of railway lines.The railway track sand removal system is a railway maintenance equipment for clearing sand in the sand areas,the design level of the equipment has a direct impact on the efficiency of sand removal and its working life.In this paper,the sand removal device of the sand removal vehicle and sands are the main research objects.The research is studied in discrete element analysis,structural statics analysis,fatigue life analysis and structural optimization design of the desilting device,including the following research works.(1)The discrete element method,which is used to study the analysis of granular materials,is used in the study of the sand removal vehicles.The structure principle of the track desilting vehicle is introduced,and the three-dimensional model of the sand removal device is set up.Through the method of virtual calibration,we get the model parameters of sand,and establish the discrete element simulation model of sand and sand removal device,and simulate the movement process of sand collecting,sediment discharging and sand throwing in the desilting device.(2)Using the EDEM software to perform discrete element simulation analysis on the sediment removal process of the sand removal device under different working conditions,We find that at the speed of 100 r/min,the sand removal capacity is best,and the speed of the sand throwing fan meets the design index of the nearest sand throwing distance when the speed of the sand fan is 250 r/min.The influence of sand size and moving speed of sand removal vehicle on sand removal efficiency,force and torque characteristics is analyzed.(3)Based on the coupling method of EDEM and ANSYS Workbench,the discrete element simulation data are imported into ANSYS Workbech,and an analysis statics of the transient stress status of the key components of the desilting device is carried out.And the stress and deformation clouds of the sand shovel and the sand throwing fan are obtained.The fatigue life of sand shovel and sand throwing fan are analyzed by nCode Design-Life fatigue analysis software.And it is verified that sand shovel and sand throwing fan meet the requirements of statics performance and meet the reliability life design requirements.(4)Using the Design Explorer module in ANSYS Workbech to optimize the structure of the sand shovel.Under the requirements of static mechanical performance,the quality of the optimized sand shovel is reduced by 21.5 kg,which is 18.9% lower than that before the optimization.In view of the phenomenon of sand removal in the sand removal vehicle simulation,the EDEM is used to optimize the frame part of the sand removal device.After optimization,the sand removal efficiency increase by 30 kg/s,which is 27% higher than that before optimization.After optimization,the energy of sand decreases by 40% compared with that before optimization,which reduces the impact and energy consumption of sand on the rack,and improves Sand removal efficiency.