Development And Research For Control System Of Automatic Car Ladder Of Railway Catenaries Maintenance

Electrified railway system is a very important transport system in our country. By the rail catenaries erected above the rails, electricity is transported to the electric locomotives of electric railway system to ensure their normal operation, so what catenaries is reliable or not affects the efficiency and safety of the entire electrified railway transportation. Catenaries is often erected in open-air, so catenaries is easily influenced by climate and natural environment, which makes the railway catenaries becoming the most important point of failure in the transportation system, so catenaries maintenance is a very critical job. Currently, the platforms for catenaries maintenance are mostly simple car ladders by human, which wastes a lot of labor, while the existing fuel rail catenaries maintenance working vehicles are very expensive, meanwhile, they cost too much and the maintenance cost is very high. These Disadvantages make the fuel maintenance operations vehicles can not be widely used. Therefore, the development of a new railway catenaries maintenance work car ladder is very important for improving the efficiency of maintenance operations and the labor utilization.First, the requirements of the car ladder are analyzed, then the mechanical mechanism and control system of the car ladder are designed, in the end, the car ladder can travel automatically, while, when workers are doing the maintenance operations, the car ladder is fixed, so the workers are protected. In order to meet the requirements of the control system, the hardware structure of the control system is designed, then the PLC, DC motors, stepper motors and other electrical component are selected, then the input and output points of the PLC are allocated. For the convenient arrangement of lines and the maintenance, the electrical system of the car ladder is designed, including the design of the main primary circuit, the design of PLC circuit, the design of the main DC motor circuit, the design of stepper grabbing system circuit, meanwhile, for the convenient wiring, the wiring diagram is designed.In order to meet the requests of the car ladder operation, the control system software is designed. By the wireless remote control system, the car ladder is controlled by workers. According to the requirements of walking and grabbing, the PLC program is designed, then the car ladder can start and stop smoothly, the grapples can grab the rail, the workers are protected. In order to test the performance of the car ladder, the car ladder is test.In order to make car ladder more humanize, another set of control system is developed:the control system of the intelligent car ladder. The selection of the DC servo motor and the design of the wiring circuit of the servo motor is done, meanwhile, in the software design of control system of the intelligent car ladder, the system of obstacle detection, the car ladder can avoid obstacles. Currently, the automatic car ladder of the railway catenaries maintenance works well and the favorable comment is received.