Device and method for detecting wheel diameter of urban rail vehicle through sensors installed on arc in normal direction

Abstract

The invention discloses a device and method for detecting the wheel diameter of an urban rail vehicle through sensors installed on an arc in the normal direction. The device comprises a central processing unit and the plurality of laser sensors connected with the central processing unit. The portion, in a detection section, of a steel rail deflects outward, and a protective rail is arranged inside the portion, in the detection section, of the steel rail. The laser sensors are arranged between an area emptied due to deflection of the steel rail and the protective rail, are arrayed in the direction of the steel rail, and are evenly distributed on the arc with the fixed chord length radius, a probe of each laser sensor conducts measurement in the normal direction of the arc, a detection light beam is aligned with the circle center of the installation arc, and all the laser sensors are located below wheels and in the same plane with wheel circumferences undergoing diameter measurement. The multiple laser sensors are used in the method and arranged below the wheels according to the arc normal relation to simultaneously detect the wheels so that detection points can be obtained, least square fitting is conducted so that initial diameters can be obtained, and the initial diameters are averaged so that the wheel diameter can be obtained. When online non-contact type measurement is conducted, the device and method has the advantages of being high in speed, high in accuracy and large in measurement diameter range.

Description

technical field [0001] The invention relates to the field of railway wheel detection, in particular to a device and method for detecting the wheel diameter of an urban rail vehicle installed with a sensor arc normal. Background technique [0002] During the operation of urban rail vehicles, different degrees of wear will occur, which will affect the safe operation of wheels, and the change of wheel diameter caused by wear is particularly critical. During the running of the train on the main line, there are limited requirements for the wheel diameter difference between the coaxial wheel and the same bogie. If the wheel diameter difference of the coaxial wheel is too large, it will easily cause the wheel set to be scratched. The train vibrates abnormally, so the measurement of the wheel diameter is of great significance to the safe operation of the train. [0003] Commonly used arc radius measurement methods include the caliper method and the bow height chord length method. T...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the train speed information needs to be used at the same time, and the diameter measurement cannot be completed independently, and the tread information is recorded by a single laser sensor, and the diameter cannot be accurately located due to the change of the tread

Chinese patent CN101219672A (laser-based non-contact dynamic measurement method for wheel diameter, application number: 200810056339.8 application date: 2008-01-16) uses two laser displacement sensors to directly illuminate the rolling surface of the wheel tread, and measure the geometric position relationship of the installed sensors Wheel diameter, the disadvantage of this method is that the detection line does not solve the alignment problem, and the same approximate bevel method cannot accurately describe the wheel diameter

In summary, the current non-contact wheel diameter measurement technology still has shortcomings such as low measurement accuracy, slow measurement response speed, and difficult engineering implementation.

Images