Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Reexamination Certificate
1999-07-09
2001-05-15
Pham, Hoa Q. (Department: 2877)
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
C356S389000
Reexamination Certificate
active
06233050
ABSTRACT:
FIELD OF THE INVENTION
The present invention refers to the measurement of the unroundness of wheels as the difference between the maximum and minimum height of the wheel flange, being based on the fact that the flange circumference does not go out of roundness, such that when the rolling band of the wheel does so, variations in flange height are produced along the wheel development. In this measurement, visual means is used.
The mean flange height is taken as the mean and true height value.
If the diameter value of the last rolling band lathing is taken, twice the flange height of the last lathing is added and twice the height obtained as a mean value of this equipment is subtracted, the current diameter of the rolling band is obtained.
With a suitable computerized program it is possible to determine the rolling diameter ovalization and mean diameter value parameters of the wheel.
BACKGROUND OF THE INVENTION
The prior art to measure the unroundness and diameter of railway wheels is based on mechanical contacts, and not by visual means. Nevertheless, visual means has been used to measure different rolling parameters in railway vehicle wheels, for example EP-A-0 751 371 of the present applicant.
SUMMARY OF THE INVENTION
For a train moving on a track at a speed between 5 and 10 Km/h, the invention basically consists in the projection of several compact beams of light, for example, four, over the wheel to be measured, in the direction of movement of the wheel and parallel to the rail such that the beams continuously intersect the periphery of the flange and the rolling band of the wheel. The light sources may consist of laser generators for producing cylindrical laser beams.
The images generated by the light beams are captured through a filter by a video camera, which stores the images obtained at a rate of 50 to 76 images per wheel. These images are sent to a computer, where they are stored for later processing.
The length of the measurement installation will be equal or less than the bogie wheelbase which has a minimum value of 1.8 m. Preferably, the installation length will be 200 mm shorter than the bogie wheelbase.
Under these conditions, the complete development of the wheel will not be checked, such that it will be necessary to double or triple the basic installation until managing to measure the entire wheel development.
REFERENCES:
patent: 4749870 (1988-06-01), Schmalfuss et al.
patent: 4798963 (1989-01-01), Wittkopp et al.
patent: 0751371 (1997-01-01), None
Gomez Jose Luis Lopez
Gomez Gomez Carlos Javier
Sanchez Revuelta Angel Luis
Ladas and Parry
Patenies Talgo, S.A.
Pham Hoa Q.
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