Online wheel set dimension detecting method and device based on two kinds of sensors

Abstract

The invention discloses an online wheel set dimension detecting method and device based on two kinds of sensors. The device comprises the first laser displacement sensor, the eddy current displacement sensor and the second laser displacement sensor which are sequentially arranged on the inner side of a track in the advancing direction of a train. The third laser displacement sensor at the outer side of the track and the second laser displacement sensor are symmetrical about the track between the third laser displacement sensor and the second laser displacement sensor. The eddy current displacement sensor is located under a vertex of a rim. According to the method, the two laser displacement sensors arranged symmetrical about the track obtain contour lines of wheel treads through probing, and the height and the thickness of the rim are calculated out according to the geometrical relationship by means of the extracted contour lines of the treads; the two laser sensors located on the inner side of the track and the eddy current sensor obtain coordinates of three points on the circumference of the vertex of the rim through probing, and the diameter of wheels is calculated according to the geometrical relationship in combination with the height of the rim. The method and the device have the advantages that the measurement principle is simple, practicality is high, cost is low, and non-contact high-precision measurement can be achieved.

Description

technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to an online detection method and device for a wheel set size based on two sensors. Background technique [0002] With the rapid development of my country's urban rail transit, the running speed of trains is getting faster and faster, and the safety problems of its online operation are becoming increasingly prominent. As an important part of the urban rail train, the wheelset plays the role of guiding, bearing and transmitting the load during the running process of the train, and its health status plays a vital role in the safe operation of the train. During the running of the train, friction between the wheel set and the rail surface is constantly generated, resulting in a smaller diameter of the wheel set and wear on the tread surface. In addition, when the train runs through the curve, the friction between the wheel rim and the inner surface of the track will ...

AI Technical Summary

Problems solved by technology

Tang Shu and others used lasers and area array CCD cameras to realize the automatic detection system of the geometric parameters of the wheel set. However, due to the high wear and smoothness of the wheel tread and the strong reflection phenomenon, the edge of the wheel rim in the digital image is blurred, which brings difficulties to the detection; Hu Bo proposed a dynamic monitoring system for 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 wheel diameter, two eddy current sensors only realize the positioning of the wheel, 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 corresponding rolling circle of the tread The distance from the previous point, this detection method is unstable during the rolling process of the wheel, which will reduce the measurement accuracy

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