Wheelset is an important part of the bogies of rolling stock. In actual use, the deviation of wheelrail shape and wheelset geometry will lead to the intensification of the wear of wheel tread and rim, which will affect the normal operation of rolling stock. Therefore, the detection of wheelsets is of great significance to the safe operation of vehicles. At present, there are roughly two kinds of detection methods for wheelset parameters in domestic manufacturers. One is manual detection, which is characterized by high labor intensity and low accuracy. The second is to use a coordinate measuring machine. Although this method has a high test accuracy, due to the use of contact measurement methods, the test time for large components like wheels is long and inefficient.

With the increasing speed of railway system, the reliability of wheelset, as a key component of vehicle safety, is facing a severe test. In order to detect wheelset dimensions reliably, automatic detection equipment is established, which avoids the error of manual detection, provides reliable detection data for customers, and improves the convenience of data management. Laser displacement sensor is a non-contact measuring device, which has the advantages of fast adoption and high measurement accuracy, and can ensure no wear and high measurement accuracy.

Measurement principle of laser displacement sensor

The laser emitter emits a visible red laser light through a lens on the surface of the object under test. The laser light reflected by the object is received through the receiving lens by the CCD matrix inside. According to different measuring distances, CCD linear matrix presents different signals at different angles. Based on this Angle information, the distance between the sensor and the measured object can be converted.

Test requirements:

Specifically, the detection process of railway wheelset tread can be divided into two categories: spot detection and dimension detection. Point detection can include wheel radial runout and brake disc end runout. During the detection process, the detection equipment remains stationary and the wheel set under test rotates along the axis. Dimensional test items include inside distance, wheel position, disc position, axle length, journal length, tread diameter, tread shape, and rim width. During the test, the tested wheelset is kept relatively static, and the distance between the feature surfaces of the wheelset (such as the end of the axle, the shoulder of the axle, the inside of the rim, etc.) or feature points (such as the distance between the tread and the inside 70mm, etc.) is detected.

Measuring method:

When the laser sensor moves along the axis from left to right, the cross-section data of different diameters can be processed during the test by calculating the coordinates of each point through the software component, just like the shape of the workpiece under test. According to the graphic data, the computer can accurately calculate the axial size. When the wheel set is rotated at a certain Angle at the center of the axis (the rotation Angle is selected equally according to the 360 degree circle), multiple sets of data can be measured and further analyzed according to the test requirements.

Shenzhen Liyi Technology Co., Ltd. is a professional production and sales of displacement sensor, laser displacement sensor, Angle displacement sensor, spectral confocal sensor company, in need of friends can call to consult Liyi fiber coaxial displacement sensor manufacturers. Welcome your call!