Research On Mechanical Structure And Motion Control Of Track Plate 3d Scanning Measurement System

The ballastless track slabs is an important part of laying high-speed railways in China.The speed and stability of trains have a lot to do with their dimensional accuracy.At present,the size measurement of ballastless track slabs is mainly manual,with low work efficiency.Therefore,the thesis developed an automatic and intelligent three-dimensional scanning device for track plate measurement in combination with the board slab measurement.Based on the complete scan of the ballastless track slab to obtain the 3D graphics,and then analyzed the 3D graphics according to the data processing software,automatically generated a measurement report,and finally determined whether each produced track slab had met the requirements of the track slab size standards.The thesis mainly researched and developed the mechanical structure of the 3D scanning device and the track board transport vehicle,and also developed the control system of the 3D scanning device.Firstly,a great amount of domestic and foreign literatures about ballastless track slab measurement technology were reviewed in recent years.The existing track slab measurement technology was analyzed and summarized,and then initially formulated research methods and ideas for the actual measurement needs of domestic track slab manufacturers.Secondly,the size requirements of the track plate were analyzed,and the structure of the 3D scanning device and the track plate transport vehicle were designed by Solidworks software,and determine the overall plan of the 3D scanning.The 3D scanning device includes a longitudinal movement mechanism,a lateral movement mechanism,a vertical movement mechanism,and a brush movement mechanism,and the track board transport vehicle includes important parts such as frame,running gear,track foundation and so on.The transmission part involved in the three-dimensional scanning device was designed and selected.Thirdly,Ansys Workbench finite element analysis software was used to analyzethe statics of the bottom beam foundation and the portal frame under various working conditions.Dynamic modal analysis of the portal frame verified that the structural design was reasonable.On this basis,the response surface optimization design method was used for lightweight design of the portal frame beam,and the static and dynamic characteristics of the optimized portal frame were analyzed.The results showed that the lightweighting effect was obvious and the optimized portal frame met the strength and stiffness requirements.Finally,according to the mechanical structure and scanning process of the 3D scanning device,the overall system scheme of the 3D scanning control system was determined.The selection of the control system hardware,the design of the control circuit of the servo driver and the control circuit of the single chip microcomputer were completed.Under the premise of analyzing and mastering the movement mode and working requirements of the three-dimensional scanning device,the software programming of the microcontroller was completed with MDK5 software,and the servo control system was simulated with the Lab VIEW virtual instrument development platform and Proteus embedded simulation software.The measurement and control system of the servo motor was developed,real-time monitoring of the working state of the servo motor was realized,and a solid foundation was established for the automation of 3D scanning.