Research And Reliability Analysis Of Hydraulic Lifting System On Bridge-transporting Vehicle

The urban traffic condition has become an essential measure of a city development level as cities grew. Whether the city traffic is smooth, has a direct influence on the completeness of urban function. Therefore, it is a new challenge for city administrators to implement maintenance as well as transformation of the city overpasses as soon as possible. The development and design of BZT1000 t bridge-transporting vehicle is aiming at the reconstruction project of city overpasses. As a brand new product of the new technology for city bridge reconstruction project in China, it can pack、jack、erect the whole overpass bridge at the city road without affecting city traffic.This article mainly research hydraulic lifting system on bridge-transporting vehicle.Firstly, the hydraulic synchronous lifting system is designed on account of the bridge jack-up construction condition. The load-sensitive technology is used in this system to ensure the flow of each actuator is not affected by the load changes, and the feasibility that the sync jack-up device uses load-sensitive technology is verified by simulation analysis.Secondly, the mathematical model of the single channel jack-up system is developed. The conventional PID controller and the fuzzy PID controller are designed separately. The two controllers are analyzed by simulation software and results show that compared with the conventional PID controller, the fuzzy controller has better control effect.Finally, the reliability block diagram of the hydraulic jacking system of the bridge-transporting vehicle is made, meanwhile, the reliability mathematical model is built. The reliability prediction and analysis are carried out and the reliability curve is established; The fault tree model of the hydraulic jacking system is built up, and the qualitative and quantitative analysis for the model is conducted.