| Urban rail transit reshapes the pattern of every city and leads the future direction of the city.More and more metro lines adopt the way of power supply by contact rail.The detection of spatial shape and position parameters of contact rail can effectively monitor the service status of contact rail.In order to improve the accuracy and efficiency of contact rail detection,a non-contact dynamic detection system of contact rail is developed on the basis of field investigation.In this paper,we design and study the detection arm system and the portable detection vehicle from the reasonable,economic,efficient and safe point of view.The detection arm system is an independent unit suspended on the vehicle body.The detection of conductor height and pull-out value of contact rail is completed by photoelectric technology,which mainly includes the following aspects:(1)The method of non-contact detection of contact rail is studied.The laser structure light source is used to irradiate the light source on the contact rail and the running rail,and the non-contact detection is realized by obtaining the measurement parameters of the guide height and the pull-out value.Pull out value and guide height value are the numerical response of the space position parameters of the contact rail,and are important indexes to measure the space position relationship of the contact rail.This rail transit contact rail detection system uses machine vision measurement technology,through a number of groups of distance sensors to contact rail for data collection.(2)Structure design of non-contact detection system for contact rail.The mechanical structure of the system is designed according to the inspection principle and hardware installation process of the contact rail,mainly including the design of the inspection arm structure and the design of the portable inspection vehicle.The design can carry sensor,high-definition camera and other modules,and the structure is reliable and flexible detection arm structure;the design of portable contact rail detection vehicle can meet the characteristics of convenient carrying of staff,and can carry detection arm system for contact rail detection.The structure model is drawn by Solid Works,and the strength ofmain bolt connection is checked.(3)Finite element analysis of non-contact detection system structure of contact rail.The static analysis,extension and compensation optimization,dimension optimization and modal analysis of the structure designed by the contact rail detection system are carried out with the finite element method,and the optimal solution of the structure design is obtained and verified.In this paper,through ANSYS Workbench simulation,the static analysis of the contact rail inspection arm structure is carried out,and the inspection arm structure has good strength;on this basis,through shape The finder module carries on the topology optimization,according to the extension and supplement optimization results,carries on the secondary design to the detection arm structure,realizes the lightweight goal;improves the detection arm structure stability through the size optimization,selects the optimal solution through the data comparison.(4)Complete the physical production of the inspection arm structure,load it on the inspection vehicle,conduct field experiments on a line of Shentong Metro,complete the data collection related to the guide height value by using the gocator sensor,analyze the data obtained,calculate the guide height value according to the derived detection principle,and the guide height indication error is within ± 5mm,which meets the design requirements.Through the above research,the structure design of the contact rail spatial shape and position parameter detection system is completed,and the data collection of the non-contact detection of the contact rail is completed.The detection arm system can be used for the collection of the high value data of the contact rail guide,providing a reference for the equipment maintenance. |
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