Research On Dynamic Online Detection System Of Rail Profile

With the development and maturity of my country’s high-speed rail technology,train speeds are getting faster and faster,and communication between various regions is becoming more convenient,which greatly facilitates people’s travel and cargo transportation.But at the same time,high-speed trains bring greater damage to the rails.In order to ensure the safety of driving,the railway department has put forward strict requirements on the size and quality of steel rails.At present,major steel mills and welded rail bases mainly use manual measurement methods to inspect the quality of steel rails.As a contact measurement method,manual measurement methods have shortcomings such as small range,poor efficiency,low accuracy,and are easily affected by subjective factors.This has caused mis-check.Moreover,the lack of data support makes it impossible to review and compare,which seriously affects the efficiency of rail production.Based on the principle of structured light triangulation,a dynamic online detection system of rail profile with combined sensors is designed in this paper,which replaces manual completion of full-section profile reproduction and size measurement and determination of rails under moving conditions,achieving non-contact,high efficiency,high Accurate and intelligent rail geometry detection.The main research contents and results of this paper are as follows:1.This system uses four 3D smart sensors to establish a multi-sensor omnidirectional rail detection model.Based on structured light triangulation,the image coordinates of the cross-section covered by the light strip are obtained.After sensor calibration,the fusion of the scattered contours of the rail in the same coordinate system is completed.The contour registration splicing method based on the minimum distance constraint completes the restoration of the full-section profile of the rail.Finally,the irregular profile of the rail is fitted by the weighted least squares fitting method and the iterative optimization method to obtain the characteristic points of the profile to complete the rail.The measurement and comparison of geometrical parameters and the qualification judgment.2.This system simulates the on-site production line conveying roller table to build a mechanical transmission system of driving wheels combined with synchronous wheelrails,which realizes stable measurement under the condition of rapid advancement of steel rails,and greatly improves the measurement efficiency.3.The system has carried out a series of improved designs for the influence of light,temperature,dust,vibration,etc.to ensure the measurement accuracy of the system.In this paper,the accuracy and stability of the system are verified by static comparison measurement and dynamic repeatability measurement.The maximum static contrast error is 0.06 mm and the dynamic repeatability error is 0.06-0.09 mm respectively,which meets the requirements of rail quality inspection and confirms the stability and accuracy of the system.Availability,practicality and convenience.In addition,the algorithm of this system is streamlined,the system is perfect,and the operation is simple,which provides theoretical and practical reference value for rail full-section profile detection.