Study And Application Of Synchronous Lifting System In The Monorail Vehicle Bogie Separation Device

With the deepening and accelerating of urbanization process in China and the rapid development of national economy, the urban floating population becomes continues to increase. As a result the traditional public transit operators can not satisfy such a huge demand for urban floating population, which has become a constraint to economic development and further urban the bottleneck. Rail transit system is an effective way to solve urban traffic congestion and to increase the amount of traffic operation capacity,so it has been developed rapidly in major cities. Compared with the subway, straddle rail transportation system has the advantages of less land occupation, safe, reliable,comfortable, low noise, Small turning radius and strong climbing ability which is ideal for building highly concentrated urban and complex terrain or mountainous cities.Monorail train bogie with rubber tires which need regular maintenance.. Bogie separation device is used to separating carriages and bogies. According to the basic function requirements of bogie separation device and the existing problems, etc.,compared several common lifting mechanism, two single-stage hydraulic cylinder direct lifting mechanism combined with rigidity synchronization and level holding mechanism synchronous lifting system has been chosen. And proportional control valve has been used.Firstly, some commonly used lifting mechanism structure and their basic characteristics were compared. According to the basic work requirement, a suitable lifting mechanism has been chosen for the bogie separation device. The basic layout and structure of the bogie separation device was introduced, describing the work processes and procedures bogie separation device. And several key parameters of the hydraulic circuit were calculated, in order to determine the lifting loop as the main object of the hydraulic pressure and flow. The hydraulic pressure and flow were determined.Secondly, according to the valve controlled asymmetrical cylinder model derived transfer function, and determined the parameters of the transfer function according to the basic parameters of the bogie separate device. The features of the master-slave mode and equivalents model synchronous control system were analyzed. The synchronous control mode was finalized that is based on the combination of master-slave model and equivalents model. And PID controller added in accordance with actual control needs.The stability of the system was judged by Nyquist and Bode diagram. The blockdiagram of the control system is set up in SIMULINK. PID parameters have been determined. Then the unit step response curve of single hydraulic cylinder system and synchronous control system were obtained. System synchronization been verified.Finally, according to the requirements of the control functions, selecting the PLC as the core electrical control system hardware. The electrical schematics were designed,PID control program was written according to incremental PID control procedures, as well as other functions of the program. Installed and commissioning the device in the field, determined the final PID parameters. The problems encountered in the practical application were resolved and instructed.