| Iron and steel is the foundation of the development of heavy industry in the country.It is an important structure and functional material,which plays an irreplaceable role in national economic development and infrastructure construction.The transportation of steel slag is an indispensable part of smelting steel.In recent years,the output of steel mills has increased greatly,which has promoted the development of large Slag transport vehicle.Full hydraulic brake system which has good performance and reliability,develops rapidly in the field of engineering machinery.Applying a full hydraulic brake system to the Slag transport vehicle reveals some problems due to the difference in front and rear brakes.So it requires further exploration and research.Therefore,this paper studies the characteristics of a full hydraulic brake system of the100 t Slag transport vehicle,which is of great significance to improve the safety of the vehicle and the reliability of the braking.The full text can be included in following aspects:Firstly,analysis the work process of Slag transport vehicle brake system.The working principle of the accumulator filling,braking output and the front and rear axle brakes are analyzed emphatically.Secondly,the structural principle and working characteristics of the key hydraulic components in the brake system of the Slag transport vehicle are analyzed.This paper analyzes the working characteristics of charging valve which controls the upper and lower filling pressure of the accumulator and the hydraulic brake valve which provides brake operation in the brake system,and their respective static mathematical models are established.Thirdly,On the AMESim(Advanced Modeling Environment for performing Simulation of engineering systems)simulation platform,the braking system of the Slag transport vehicle is simulated and analyzed.The HCD model of the charging valve,the hydraulic brake valve and the service brake in the braking system is built,and the simulation model of the whole braking system is established.Then according to the structural dimensions of the components and the related parameters,the parameters of the simulation model are adjusted and simulated.In this paper,the simulation analysis is made on the charging characteristics of the charging valve,the response characteristics of the service brake pressure,the single circuit braking characteristics and the emergency brake pressure response characteristics.Fourthly,the simulation results and theoretical analysis are verified by experiments on the brake system of the Slag transport vehicle.Based on the CAN(Controller Area Network)bus monitoring system and data acquisition module,the brake system was tested.The charging characteristics and braking characteristics of the braking system are mainly tested.The experimental results are in good agreement with the simulation results,which verify the correctness of theoretical analysis and simulation results.Lastly,the existing braking system was optimized to match the braking form of the Slag transport vehicle.From the simulation results and experimental results,it was showed that the rear axle braking response speed lagged behind the front one.The main reason for this was that the rear axle brake cylinder requires a large amount of fluid to eliminate the piston-free travel and rear bridge brake supervisor road is longer.Through the combination of simulation analysis and experimental test,the feasibility of the optimized scheme was verified. |
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