Wheel set size on-line detection method and device based on various sensors

Abstract

The invention discloses a wheel set size on-line detection method and device based on various sensors. The device comprises the first eddy current displacement sensor, the second eddy current displacement sensor and the second laser displacement sensor which are sequentially arranged on the inner side of a rail in the train heading direction, and comprises the first laser displacement sensor which is arranged on the outer side of the rail, wherein the first laser displacement sensor and the second laser displacement sensor are symmetrical about the rail. The method comprises the steps that the two laser displacement sensors detect and obtain a tread contour line, and a rim height and a rim thickness are worked out according to the geometrical relationship by extracting the tread contour line; the two eddy current displacement sensors are used for detecting the distances between the rim top point and the two eddy current displacement sensors, when the distances detected by the two eddy current displacement sensors are the same, the lowest point on the wheel rim top point circle passes through the middles of the two eddy current displacement sensors, and the wheel diameter is worked by extracting the distance readings on the eddy current displacement sensors and combining the distance readings with the rim height. According to the wheel set size on-line detection method and device, the cost is low, the principle is simple, practicability is high, and non-contact high-precision measurement is 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 various sensors. Background technique [0002] In the entire rail transit operation system, the train wheel set is an important factor that affects the safety of the locomotive as the running part of the locomotive. Especially in recent years, the speed of trains has been continuously improved, and the safety problems of vehicle operation have become increasingly prominent. During the operation of the vehicle, there is a force transmission between the wheel and the rail, which causes the friction and wear of the wheel tread, which has a great impact on the safety, riding comfort and running stability of the vehicle. When the wheel wear rate exceeds a certain limit, it may even cause driving safety accidents such as derailment. Therefore, it is necessary to regularly detect the friction and we...

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 on-line detection technology of domestic wheel set size, Cao He et al. used CCD image measurement technology for measurement. This method has advantages in price compared with foreign countries, but the system structure layout is relatively complicated and is easily disturbed by the outside world; Chinese patent CN103322936 (on-line monitoring method for wheel set size, application number 201310256167.X, application date: 2013-06-24) discloses an online wheel set size detection method, which uses four sets of laser displacement sensors to monitor the Thickness, wheel diameter and other dimensions are detected, and the cost of this detection method is too high; Chinese patent CN103693073A (a non-contact wheel diameter dynamic measurement device and its measurement method, application number 201410005647.3, application date: 2014-01-06) published A dynamic wheel diameter measurement device and its measurement method are proposed. The method uses two eddy current sensors and a laser displacement sensor to detect the wheel diameter. The two eddy current sensors only realize the positioning of the wheel, and do not involve in the calculation of the wheel diameter. To the distance reading measured by the eddy current sensor, and only one laser displacement sensor is used to measure the distance from the tread surface to 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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