| China has vigorously developed railway technology,and the number of high-speed rail mileage has exceeded 2/3 of the world's total mileage,ranking first in the world.To ensure trouble-free operation of the EMU,the EMU must go to the EMU for inspection and maintenance every time it runs.During the maintenance of the EMU,the contact net above the EMU must be cut off and the residual voltage should be grounded to protect the personal safety of the operator.Since the existing mechanical automatic grounding device can only perform the grounding operation on the contact network,the feedback device to which the grounding rod is connected is not designed,and it is impossible to judge whether the rod movement is accurate and reliable,and there is a hidden danger that threatens the personal safety of the operator.This thesis designs and implements the safety protection of EMU maintenance work as the research object.After studying the maintenance process,maintenance content,and operation methods of the maintenance work,a set of EMU maintenance safety protection system is designed and developed.The overall structure of the system is divided into two parts: personnel detection and rod monitoring.For personnel detection,an entry ban system is designed.By setting access permissions,the purpose of identifying personnel and access detection is achieved;for rod monitoring,the design is designed to The LabVIEW visual control is the core rod monitoring system.The camera is used to collect the images of the rods and process and judge them to achieve the purpose of identifying the status of the rods.The access control system uses STM32 as the core.The hardware part uses TFTLCD as the display module,fingerprint recognition and radio frequency identification as the identity recognition module,combined with the power circuit and peripheral circuits to construct the hardware architecture of the access control system.The software part adopts modular program design,which mainly includes three major program modules: main program,identification program and display program.The host computer selects the LabVIEW platform and is embedded in the rod monitoring system.The hardware platform sends the personnel detection information to the host computer in real time,and accepts the linking status signal of the rod.The rod monitoring system mainly judges the linking state of rods and counts personnel information.Firstly,the camera module is used to collect images of the linking of grounding rods and contact nets,and secondly,the state of the rods is analyzed and judged by object matching recognition technology.The system programming takes full advantage of the functional functions provided by the LabVIEW machine vision control to complete the collection,graying,matching and other processing of the rod image;then the serial communication module is called to communicate with the access control system.Finally,module debugging and overall debugging are carried out on the safety protection system for the maintenance work of the EMU.The module testing is mainly carried out from three aspects: system communication,personnel detection and rod identification.The debugging results show that the rod monitoring system can identify the linking status of the rod in real time,and the access control system can communicate with the rod monitoring system in real time and can detect personnel.The overall safety protection system of the EMU preparation operation is stable and reliable,which meets the expected design requirements. |
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