Study And Design For No-load Test Platform Of The Straddle-type Monorail Bogie

As a new way of public transportation, urban rail transit has the merit of lowpollution, low energy consumption, vast capacity, etc. It has been the trend of thedevelopment of urban public transport. Because of the geographical characteristics ofhills, Chongqing has constructed the first straddle-type monorail transit system, whichhas the advantages of low noise, strong climbing ability and small turning radius. As animportant part of the monorail vehicle, to a large extent, the performance of the bogiedirectly determines the monorail vehicle runs safely and steadily. The no-load testplatform of the monorail bogie is used to test the bogie after being maintained.This paper states the research background and the development situation of thebogie test platform and makes the goal, the meaning and main contents clear. After fullyaware of the straddle-type monorail bogie, based on the existing on-load test platform ofmonorail bogie, the test platform is optimally designed and broken into5parts, i.e.,supporting, sending, compression and stop, drive and control component.The supporting, the sending, the compression and stop and the drive componentconstitute the mechanical part of the test platform. In the process of testing, the powersource is provided by the drive motor in the test platform, ignoring the bogie type. Theway of speed control is variable frequency motor with frequency converter. Thelongmen loading device is adopted in the compression component. Two loading discsare used to exert pre-pressure on the bogie to weaken vertical vibration during testing.The slides are adopted in the stop component, which have the function of rise and fall.With the combination of stop baffle, the stop component can not only prevent the bogiefrom moving horizontally, but also supporting the bogie. The supporting and sendingcomponent are little changed.The control component consists of hydraulic and electrical control system. Thecompression loop and sending loop constitute the hydraulic control system. This papercompletes the design of the hydraulic system schematic. In order to prevent the airspring in the bogie from unbalance loading, the compression loop guaranteessynchronous movement of the two loading discs via closed-loop control mode ofelectro-hydraulic proportional directional valve.Electrical control system uses PLC as the control center and upper and lowercomputers control system as the man-machine interaction mode. This paper designs the main circuit diagram of the entire test platform. The logical control of the test processesis completed by PLC. The free-port communication between PLC, sensors and datadisplay instruments. By using visual basic assembly language, the upper computer clientis designed. And the communication between the upper computer and PLC is completedby the OPC communication technology, which realizes the interaction control betweenthe upper and lower computer.