Wheel dimension detection method and system based on two-dimensional laser position detection technology

Abstract

The invention discloses a wheel dimension detection method and system based on two-dimensional laser position detection technology and relates to the field of automatic measurement of geometric dimension of a wheel set. The method is characterized by emitting n(n>=4) linear laser to the wheel first, wherein in the wheel advancing process, the wheel cuts the linear laser, and the linear laser and arim vertex circle form n(n>=4) intersection points Pi totally; obtaining three-dimensional coordinates Pi (Xi, Yi, Zi) of the intersection points Pi; detecting vertical position change amount of eachemitting point, and correcting the three-dimensional coordinates of the intersection points Pi; and according to the corrected three-dimensional coordinates of the intersection points Pi, obtaining radius R of the vertex circle and the three-dimensional coordinate of the circle center O. The method and system can accurately measure wheel rim dimension and tread wear extent of the wheel in the dynamic operation process, and the measurement precision is not influenced by deformation quantity of the track; and in the long-term use process, wheel rim dimension and tread wear extent of the wheel can be measured automatically and dynamically, so that the method and system can realize dynamic correction and have a certain adaptive capability.

Description

technical field [0001] The present invention relates to the field of automatic measurement of the geometric dimensions of wheels and wheels, and more particularly, to a method and system for detecting wheel dimensions based on two-dimensional laser position detection technology. Background technique [0002] For a wheel based on track operation, the circumferential surface of the wheel is composed of two curved surfaces, the rim and the tread. The tread is in contact with the track to realize load-carrying operation. guide function. When the wheel runs along the track, the surface part of the wheel's circumferential surface that is in contact with the rail will be worn, that is, the tread will be worn or scratched, and the side of the wheel rim that is in contact with the inner side of the track will be worn, resulting in the thickness of the rim Thinned. Once the wheel tread wears abnormally, along with the circumferential wear of the tread, the diameter of the wheel beco...

AI Technical Summary

Problems solved by technology

When the train turns or passes through the curved track, the two wheels cannot roll smoothly at the same time, and the outer wheel will slide, which intensifies the wear of the wheel rim and the rail

②The rim becomes thinner and higher, aggravates the vertical wear of the rim, and the root of the rim is prone to cracks

At the same time, the abnormal wear of the wheels makes the tread surface too deep, which makes it easy for the train to cut and touch the connecting bolts of the track when it is running on the line, causing derailment. After the vertical wear of the wheel flange is intensified, the wheel is likely to cause derailment or crush the tip rail when passing the branch road. ACCIDENT

③Because after abnormal wear, the tread surface forms a groove-like shape, and its wear surface is prone to produce local planes, which makes the wheelset unable to roll smoothly and increases the impact vibration of the train

④ The standard shape of the tread is destroyed, the taper between the tread and the track becomes larger, the wavelength of the serpentine motion of the wheel decreases, and the frequency increases, which affects the stability of the train running

⑤ After the wheel tread is worn, especially after abnormal wear occurs, the contact surface with the rail increases, the contact area between the wheel tread and the rail increases, and the deviation of the distance between the contact points of the tread and the rail and the center of the axle increases, and the vehicle runs Increased resistance

However, since the rim of the wheel is a curved surface, there is no knife edge (i.e., the sharp point of the curved surface), and it is difficult to accurately locate the apex of the rim during the dynamic non-contact detection process, which will affect the accuracy of the wheel size detection

[0004] Secondly, due to changes in the slack of the foundation at the track, or in different seasons of rainfall, or changes in the load of the train, when the wheels loaded with the train pass on the track, the position of the wheel axis will change, which will also affect the detection of the wheel size. precision

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