Device and method for detecting wheel diameter of urban rail vehicle with sensor arc vertically installed

Abstract

The invention discloses a device and method for detecting urban rail vehicle wheel diameters through arc vertical installation of sensors. The device comprises a central processing unit and a plurality of laser sensors connected with the central processing unit. A steel rail at a detection zone deviates outwards, and a protective rail is arranged on the inner side of the steel rail at the detection zone. The laser sensors are arranged between the area vacated by deviation of the steel rail and the protective rail, and probes of the laser sensors are arranged in the direction of the steel rail and evenly distributed on an arc with a fixed chord length radius. Detection light beams of each laser sensor are perpendicular to the steel rail and face upwards, and all the laser sensors are located under wheels and are coplanar with the circumferences of wheels subjected to diameter measurement. According to the method, the laser sensors are used and are installed under the wheels according to the arc vertical relationship, and the wheels are detected to obtain detection points; the initial diameters of the wheels can be obtained through least square fit, and the initial diameters are averaged to obtain the diameters of the wheels. According to the device and method, the advantages of high speed, high accuracy and big diameter measurement scope can be achieved through on-line no-contact type measurement.

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 in which a sensor arc is vertically installed. 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 lengt...

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.

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