The Design And Flow Field Simulation Of A New Cleaning Device For Electric Sweeper

Electric cleaning vehicles as the backbone of the road environmental protection work,cleaning device as the key parts of the electric cleaning vehicles,it’s cleaning ability and vacuum efficiency directly affect the vehicle cleaning performance,so the cleaning device structure design and performance optimization is of great significance.In this paper,the cleaning device and its key institutions as the research objectives,in order to improve the cleaning efficiency as a performance index,put forward a new retractable-adjustable double cleaning device layout structure;and put forward the application of gas-solid two-phase flow theory for flow field analysis of roll suction nozzle,the specific research work and conclusions are as follows:Firstly,according to the analysis of layout and working principle of the cleaning device,a new type of retractable-adjustable double cleaning device is designed.According to the performance requirements of the new cleaning device,the hydraulic system and the key mechanism are designed,and the main components are carried out calculation and selection;based on the preliminary design of the cleaning device,the paper discusses the cleaning performance of the brush hair.Secondly,by studying the trajectories of sand particles in the drum,the key parameters of the roller wall are indirectly optimized.The theoretical trajectory equations of the sand particles in the moving stage of the drum are established by means of modern contact dynamics,the front baffle and the drum parameters of the critical point value as the optimization object,and the parameters of the drum wall are optimized by MTALAB.The optimization results show that the baffle plate in front of the drum and the drum surface angle of =30 degrees;the critical point of roll center brush level line angle of =60 degrees for the optimal parameter solution.Again,in order to improve the vacuum efficiency of the new roller suction nozzle,the design criteria and performance indexes of the sucker are designed and analyzed;in order to ensure the reliability and accuracy of the simulation of the flow field of the suction port,analysis and discussion numerical simulation method of the working medium(gas phase)and the research object(particle).The results show that the Euler-Lagrangian method should be used to simulate the gas-solid two phase coupling of the suction port.Finally,based on ICEM and FLUENT,the grid model and flow field simulation of the initial nozzle model are analyzed,from the point view of velocity distribution and particle traces in gas-solid two phase flow,and analyze its structure unreasonable,put forward the change of outlet diameter and suction port width two optimization methods are simulated and analyze the internal velocity distribution of nozzle under the different structural parameters;cleaning performance of vacuum port using the discrete phase model for optimization,the performance parameters were analyzed before and after optimization,the optimal structure parameters to prove correctness and rationality.The simulation results show that the width of the suction port is 220 mm and the outlet diameter is 200 mm,which is the optimal structure parameter;and after optimization,the speed of inlet is increased to 4.8 m/s,the mass flow rate is increased by 0.543 kg/s,and the total pressure difference is reduced by 448 Pa;when the sand equivalent diameter is 8 mm,optimized to improve the efficiency of vacuum suction mouth 6.8%,and the maximum suction particle diameter size of 9 mm,the cleaning performance is better than industry standard.In summary,the overall design and research of the new double cleaning device are carried out,taking the dust removal efficiency as the performance index,this paper analyzes the structural parameters optimization and simulation analysis of the drum wall and the suction port,improve the cleaning performance of the cleaning device.