Non-contact wheel set dimension online detection method and device based on various sensors

Abstract

The invention discloses a non-contact wheel set dimension online detection method and device based on various sensors. The device comprises the two laser displacement sensors symmetrically arranged on the inner side and the outer side of a track, and the two eddy current displacement sensors arranged on the inner side of the tract. The method comprises the steps that the two laser displacement sensors detect and obtain tread contour lines, and the rim height and the rim thickness are calculated through the extracted tread contour lines according to the geometric relation; the two eddy current displacement sensors are used for detecting the distances to the vertexes of the rims in the vertical direction, measurement data of the three sensors on the inner side of the track are extracted at the moment when wheels pass through the effective measurement range of the eddy current displacement sensors and the laser displacement sensors on the inner side of the rack simultaneously, the diameters of the vertex circles of the rims are calculated according to the measurement data and the geometric relation, and then the diameters of the wheels are calculated according to the wheel rim height. The non-contact wheel set dimension online detection method and device based on various sensors have the advantages that the measurement principle is simple and practical, cost is low, and precision is high; non-contact and real-time measurement can be achieved.

Description

technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to a non-contact wheel set size online detection method and device based on various sensors. Background technique [0002] With the large-scale construction of domestic rail transit and the continuous improvement of train speed, its safety issues have been paid more and more attention. As an important running part of a wheel-rail vehicle, the wheel set has defects such as wear, abrasion, and peeling on the tread surface of the wheel set due to long-term friction with the track, braking, and vibration under harsh working conditions. These defects seriously threaten Driving safety. Therefore, it is necessary to detect the state of the train wheel set in time and effectively, find the wheel set defect in time, repair or replace the overrun wheel set, so as to avoid the occurrence of train accidents. [0003] The dynamic online detection technology of wheel set size...

AI Technical Summary

Problems solved by technology

The on-line detection technology and application of foreign wheelset size are relatively mature, but due to the large scale of equipment, high requirements for installation base and high price, foreign systems are not suitable for the actual situation of domestic subway companies

For the online detection technology of domestic wheel set size, Cheng Wenping studied the wheel set size detection technology based on machine vision, which improved the detection efficiency. However, due to the strong reflection phenomenon of the worn part of the wheel, the edge of the wheel set in the digital image becomes blurred. Fuzzy, which brings difficulty to the later image processing; Hu Bo proposed a dynamic monitoring system of wheel set size based on PSD laser displacement measurement technology, which has the characteristics of strong real-time performance and high resolution, but the system requires many sensors. , high installation requirements and expensive; Chinese patent CN103693073A (a non-contact wheel diameter dynamic measurement device and its measurement method, application number 201410005647.3, application date: 2014-01-06) discloses a wheel diameter dynamic measurement device And its measurement method, the method uses two eddy current sensors and a laser displacement sensor to detect the diameter of the wheel, wherein the two eddy current sensors only realize the positioning of the wheel, and the distance reading measured by the eddy current sensor is not involved in the calculation of the wheel diameter, And only one laser displacement sensor is used to measure the distance between the tread surface and a point on the rolling circle. This detection method is unstable during the rolling process of the wheel, which will reduce the measurement accuracy.

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