JPS61201108A - Non-contacting measuring device for third rail irregularity - Google Patents

Abstract

PURPOSE:To secure the titled device and to improve its measuring speed by arranging respectively non-contacting displacement measuring sensors to respective rails, and detecting the relative position for the special reference surface of the peak of the rails which are respectively objects, by three pairs of the sensors. CONSTITUTION:Peaks Pa, Pb and Pc of the first, second and third rails are respectively the peaks of rails 1a, 1b and 1c, the height from a reference surface Ho is respectively (a), (b) and (c), and then, the third rail irregularity DELTAH is expressed as the formula. A Gab is an actually measured size between the peak Pa and Pb of the first and second rails, a Gbc is an actually measured size between the peaks Pb and Pc of the second and third rails and are the already known constants. At such a time, the height (a), (b) and (c) are detected by non-contacting displacement measuring sensors 5a, 5b and 5c, and the calculation shown in the formula is executed, the symbol DELTAH is counted and then, the third rail irregularity can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention can safely measure the third rail deviation even at discontinuous points of the third rail, and moreover, the third rail deviation can be safely measured even at discontinuous points of the third rail, and the measurement speed and accuracy are improved compared to the conventional third rail. Concerning a non-contact measurement device for track deviation.

[Conventional technology]

Figure 2 (a) shows a plan view of, for example, a subway track where power is supplied from the third rail, where 1a is the first rail, ■b is the second rail, IC is the third rail, and the train is on the third rail. The first rail 1a and the second rail 1b are used as running rails, and the vehicle is supported and guided by these rails, and is powered by the third rail 1c to run.

As shown in the side view of FIG. 2(b), the third rail IC has discontinuous parts at each section change.
When trying to measure the third track deviation using the mechanical contact method, each time the machine comes to a discontinuity, it is necessary to stop and pull up the displacement measurement sensor to pass the discontinuity, or take measures such as installing a guide shoe. There must be.

Furthermore, in the conventional mechanical contact type measuring device, the misalignment of the traveling rail affects the measurement accuracy of the third rail misalignment.

[Problem that the invention seeks to solve]

The present invention eliminates the need to operate the conventional mechanical contact type third rail deviation measuring device, which requires stopping or pulling up the sensor every time it reaches a discontinuous part of the third rail at the change of section. The purpose of the present invention is to provide a non-contact measuring device for third track deviation that solves these problems, as it is complicated and takes a long time to measure.

[Means for solving problems]

The problems with the conventional third track deviation measuring device are all due to the fact that the conventional method is a mechanical contact method, so in the present invention, a reliable non-contact measuring device is used.

At present, a non-contact displacement measurement sensor as shown in FIG. 3 has already been developed, and its performance is sufficiently reliable. In Figure 3, 1a is a rail, 7 is a laser oscillator, 8 is a light projection lens, 9
is a cylindrical lens, 10 is a scanning image camera, 1
1 is a deflection coil, 12 is a signal processing section, and this sensor can simultaneously measure horizontal and vertical displacements of the rail.

A non-contact displacement measurement sensor like this is installed on each rail.
If they are arranged respectively, the relative position of the apex of the target rail detected by the three sets of sensors with respect to a specific reference plane will be:
It should match the actual relative position. Furthermore, even at discontinuous points in the third rail, there is no need to pull up the sensor, which greatly improves operability and also dramatically improves safety. Therefore, the time required for measurement is significantly reduced.

〔Example〕

FIG. 1 is a perspective view of essential parts of an embodiment of the present invention, in which 2 is a sufficiently rigid beam attached to the undercarriage frame parallel to the axle; 3 is a beam of sufficient rigidity;
is a bogie, 3-1.3-2 is a chassis frame, 4-1.4-2 is an axle, 4-3.4-4.4-5.4-6 is a running wheel, 5a
, 5b and 5c are rails 1a and tb fixed to the beam 2, respectively.
Non-contact vertical and horizontal displacement measurement sensor that measures ICs,
6 is a pulse generator that sends a pulse signal to the displacement measurement sensors 5a, 5b, and 5C for simultaneous measurement operation when the axle rotates by a certain angle (that is, when the axle moves a predetermined distance).Using this embodiment, Assume that data as shown in Figure 4 is obtained at a certain location on the rail. In Fig. 4, P a % P b and P c are the vertices of the rails 1a, tb, and IC, respectively, and the heights from the reference plane Ho are a and bsc, respectively, and the third rail deviation Δ
As is already known, H is expressed by the following formula.

However, Gab is the actual measured dimension between points P a % P b, Gb
c is a measured dimension between points Pb and Pc, and is a known constant. At this time, a, b%G is detected by non-contact displacement measurement sensors 5a, 5b, and 5C, and the above formula is calculated to calculate Δ
By calculating H, the third track deviation can be determined.

Assume that there is one depressed part of the second rail, as shown in Figure 5. In the conventional mechanical contact type third track deviation measuring device, the mechanism needs to be simple, and the positions of the vertices of the first and second rails with respect to the reference plane are not measured, but the first and second track deviations are measured. When extending the straight line connecting the vertices of the second rail to the third rail side, does it match the apex of the third rail (no deviation) at the third rail (on the vertical line set at the third rail position)? It was designed to measure how far above and below the peak it passed. Therefore, at the second rail depression point, the apex of the third rail is measured as being out of place and protrudes upward. On the other hand, if the non-contact measurement is performed according to the present invention, the depression of the second rail will be measured to a certain extent, and the third rail will be correctly measured assuming that there is no abnormality. In the non-contact displacement measurement sensor used in this example, the displacement is calculated electrically in the signal processing section, but it is generally This is extremely easy for systems that process signals manually. In this example, the rail is irradiated with a thin, flat laser beam, and the intersection line that appears as a bright line on the rail surface is photographed to measure displacement. However, a gap-type sensor is used as a non-contact displacement measurement method. May be used.

〔Effect of the invention〕

As explained above, according to the present invention, even discontinuous portions of the third rail can be measured safely and without special operations, thereby improving measurement speed and generally improving measurement accuracy. Additionally, depending on the selection of a non-contact measurement sensor, mechanical simplification can be realized, and the price may be lowered.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main part of the present invention-embodiment, Fig. 2 (a) is a plan view of the overhead contact line that supplies electricity with the third rail, and Fig. 2 (b) is a plan view of the third rail with a discontinuous portion. A side view, Fig. 3 is an explanatory diagram of the principle of the non-contact displacement measurement sensor adopted in the example, Fig. 4 is an explanatory diagram of the third rail deviation, and Fig. 5 shows a defective line with a depressed part in the second rail. It is a diagram. 1a-first rail, 1b-second rail, lc-third rail, 2-beam, 3... one bogie, 3-1.3-2-car underframe, 5a, 5b, 5c-each rail 1a
, lb, non-contact displacement measurement sensor attached to the beam to measure the displacement of the IC, 6-pulse generator, 7-laser oscillator, 8-projection lens, 9-cylindrical lens, 10-scanning type. Image camera, 12-signal processing unit, Pa-vertex of first rail, pb.-second! l
Apex of article Al1, Pc-apex of article 3tlt, Ho
-・Reference plane, ΔH-3rd track deviation.

Claims (1)

[Scope of Claims] 1) A member having sufficient rigidity in the direction perpendicular to the rails at the lower part of the bogie or car body has specific standards at three points: the apexes of the two running rails and the apex of the third rail. A means is provided to measure the relative position to the surface at the same time and within a short period of time in a non-contact manner, and each time the vehicle travels a predetermined short distance,
Measure the position of the point, find the point where the straight line extending to the third rail side by connecting the vertices of the two running rails in a direction perpendicular to the rails intersects the vertical line set at the apex of the third rail, and measure this point. and third
A non-contact measuring device for third rail deviation, characterized in that the third rail deviation, which is the distance from the top of the rail, is measured in a non-contact manner. 2) The above measurement means includes three sets of non-contact displacement measurements that simultaneously measure horizontal and vertical displacement of the rail by irradiating the target rail with a laser beam and receiving the reflected light from the rail with a scanning imaging camera. A non-contact measuring device for third track deviation according to claim 1, which comprises a sensor.