JPS6333082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floodlight for measuring trolley wire wear in a tunnel, which can suppress reflected light from the upper wall surface of the tunnel.

Conventionally, in optical trolley wire wear measurement devices using electric inspection vehicles (hereinafter simply referred to as inspection vehicles),
A method has been put into practice in which a floodlight installed on the roof of the inspection vehicle illuminates the sliding surface of the trolley wire, and the reflected light is captured by a light receiver installed inside the inspection vehicle. In this case, the trolley wire is installed so as to meander in a zigzag pattern (hereinafter referred to as deviation) in a horizontal plane in order to equalize the wear of the sliding plate of the pantograph that comes into sliding contact with the trolley wire, and the above-mentioned floodlight is attached to the trolley wire. It is necessary to arrange the beams so that the luminous intensity is sufficient and uniform over the range of deviation of the line.

FIGS. 1a and 1b illustrate the conventional arrangement of a projector, in which the trolley wire 1 is deviated within the range indicated by arrow D. Opposed to this, floodlights 2 are arranged on the roof 3 of the inspection vehicle, and the six floodlights 2a to 2f are placed in roughly the same range as the deviation range D, and emit light almost vertically upward. It is something. Note that the sliding surface of the trolley wire 1 is not necessarily a smooth surface with good reflection, and in order to obtain good reflected light, floodlights 2g to 2j are provided on both left and right sides of the trolley wire 1 so that the contact surface is within the deflection range D. The method is to irradiate the light obliquely upward. Each floodlight 2a,... used is a 300w normal incandescent light.
It is for outdoor use, and the power required in this case is
It is 3kw.

FIG. 2 explains the optical path of the reflected light from the sliding surface of the trolley wire 1. Of the reflected light, the vertically downward component passes through the window 4 provided in the roof 3, and passes through the mirrors 5, 6, 7. The light is reflected by the light receiving lens 8a, and an image is obtained within the image receptor 8. Here, since the height of the trolley wire 1 changes over a fairly wide range, there is a risk that the above-mentioned optical path length changes and the image on the image receptor 8 becomes out of focus. The mirrors 6 and 7 are controlled to move in the direction of arrow A based on the height signal from the height detector, so that a constant optical path length can be maintained at all times. As described above, a stable image without defocusing can be obtained on the image receptor 8 with an appropriate amount of light, and highly reliable measurements can be performed.

However, the above-mentioned system causes serious problems in tunnel sections of railway tracks.
That is, in the tunnel section, as shown in FIG. 1b, the projected beam from the projector 2 is reflected by the upper wall surface 9 of the tunnel, enters the receiving optical path shown in FIG. It becomes noise and interferes with the reflected light.

There are various types of tunnel structures.
Among them, those called narrow tunnels have relatively small cross-sectional dimensions, so the height of the wall surface 9 is low;
The ground clearance of the trolley line 1 is therefore also particularly low. As a result, the interference caused by light reflected from the wall surface 9 is actually greatest in narrow tunnels.

The above-described method of placing the floodlight 2 on the roof 3 has a disadvantage that it is not necessarily convenient for maintenance due to the danger of the high voltage of the trolley wire 1.

It is an object of the present invention to provide a floodlight for measuring trolley wire abrasion that can eliminate the measurement interference caused by the light reflected from the tunnel wall surface and has excellent efficiency and workability.

In the light projector for measuring trolley wire wear according to the present invention, the aim is to prevent the above-mentioned reflected light from the tunnel wall surface from entering the light receiving optical path as much as possible. However, as long as the method uses a floodlight to illuminate the trolley wire from below, the wall above the trolley wire will always be illuminated with the floodlight, and the reflected light will be directed downward along with the light reflected by the trolley wire. Yes, there is no definitive method that can block only the light reflected from the wall surface. However, the reflected light from the tunnel wall surface has directional characteristics that are considered advantageous in this case. That is, in FIG. 1b, a relatively large amount of light reflected from the wall surface 9 by the vertically upward projectors 2a to 2f enters the light receiving optical path, but the light reflected from the wall surface 9 by the obliquely upward projectors 2g to 2j is It has been confirmed that a considerable portion of the reflection is directed in the direction of specular reflection according to the law of light reflection, that is, diagonally downward, and as a result, the amount that enters the receiving optical path is considerably smaller than that caused by the vertically upward projectors 2a to 2f. has been done.

Now, as a reflector plate generally used for the verification of optical equipment, it can be used as a reflector for incident light from any direction.
The reflected light can be diffusely reflected evenly in all spatial directions (of course within the reflecting hemisphere). In other words, although non-directional reflectors exist and are in practical use, it is true that, except in special cases like this, the light reflected by an ordinary object with a rough surface has a relatively large component in the specular direction. It is. It is thought that the above-mentioned directional characteristics of the reflected light by the tunnel wall surface are due to this fact.

According to these facts, it is considered that the solution to the problem is to use only the side projectors 2g to 2j in the tunnel. This is because it is possible to reduce as much as possible the reflection interference from the wall surface 9 that enters the light receiving optical path. However, when using such a system, the use of the vertically upward projectors 2a to 2j is stopped, resulting in an insufficient amount of light, so it is necessary to strengthen the side projectors by that amount. Not only is this difficult to achieve due to the conditions on the roof 3 of the surveying vehicle, but also because the height of the trolley wire 1 is particularly low in the narrow tunnel mentioned above, the trolley wire can be easily removed from the light projection range whose direction is properly adjusted in a normal section. 1 deviates downward. On the other hand, it is possible to use a floodlight that can illuminate such a wide range, but a floodlight that can illuminate the required wide area at a position on the roof 3 close to the trolley wire 1 will inevitably have low efficiency. This is never a good idea.

Therefore, in this invention, a projector is installed inside the inspection vehicle, and the efficiency is improved by narrowing the projecting angle range (directional characteristics), and by making the projecting angle oblique to the wall surface, it is possible to This method is designed to eliminate as much as possible interference from reflected light. In this case, as the height of the trolley wire 1 changes, the appropriate value of the above-mentioned light projection angle changes, resulting in the inconvenience that the trolley wire cannot always be effectively irradiated. A feature of the projector according to the present invention is to avoid such inconvenience by utilizing the optical path.

FIGS. 3a and 3b show an embodiment of a light projector for measuring trolley wire wear according to the present invention. In FIG. Provide one each on the left and right. In FIG. 3a, the light beam emitted by the light projector 10 illuminates the sliding surface of the trolley wire 1 through the same optical path as the received beam. In FIG. Light is projected towards the target. Here, the directivity angle S of the projected beam is the trolley wire 1 at the standard height.
Select an angle that can irradiate 1/2 of the deflection range D.
Furthermore, by adjusting the projection angle θ, the peripheral edges of the projection beams of the projectors 10a and 10b are made to coincide with each other at the center point C of the deflection range D. With this setting, since the light is incident on the wall surface 9 in an oblique direction, as described above, relatively few components of the reflected light enter the light receiving optical path, and interference is eliminated.

Here, to discuss the above-mentioned light projection angle θ again, as mentioned above, the ground height of the trolley wire varies greatly depending on the location, but the light projection angle θ
The projected light beams from a and 10b pass through mirrors 6 and 7 in FIG. 3a. As mentioned above, the mirrors 6 and 7 always keep the optical path length between the trolley wire 1 and the light receiver 8 constant regardless of changes in the height of the trolley wire 1, so the optical path in FIG. The length l is assumed to be constant, so once the projection angle θ is set using the method described above, irradiation can be performed reliably and evenly over the deflection range D, regardless of changes in the height of the trolley wire 1. It is something that can be done.

Note that the light sources used for the floodlights 10a and 10b may be any light source as long as it has the required luminous intensity and directivity, but a light source with good luminous efficiency such as a xenon lamp should be used, and the light source can be oriented using a reflector, lens, etc. By providing such characteristics, the sliding surface of the trolley wire 1 can be illuminated sufficiently brightly with low power.

As is clear from the above explanation, according to the trolley wire wear measurement floodlight according to the present invention, the reflected light beam is directed in an oblique direction by utilizing the reflection direction characteristics of the tunnel wall, thereby penetrating into the light receiving optical path from the tunnel wall surface. Not only does it eliminate interference light as much as possible, making it possible to measure wear in practically narrow tunnels, but it can also be used stably against changes in the height of the trolley wire, so it can be used in all sections other than tunnels. It is extremely effective as an alternative to conventional roof-mounted floodlights. Furthermore, by installing the floodlight inside the inspection vehicle, maintenance work is significantly improved compared to conventional roof-mounted floodlights, and the sharply directional floodlight improves power efficiency, among other benefits. It has a large contribution to make in this direction.

[Brief explanation of the drawing]

Figures 1a and b show the conventional arrangement of floodlights. Figure 1a is a plan view, Figure 1b is a vertical sectional view taken in a direction perpendicular to the trolley wire, and Figure 2 is a conventional arrangement of floodlights. FIGS. 3a and 3b are diagrams illustrating the arrangement of the projector and the path of the projected beam in an embodiment of the projector for measuring wear of the trolley wire according to the present invention. It is. Symbol explanation, 1... Trolley wire, 2, 10... Floodlight, 3... Roof of inspection vehicle, 4... Window, 5, 6, 7... Mirror, 8... Light receiver, 8a... Light receiving lens, 9... Tunnel upper wall surface.

Claims (1)

[Claims] 1. A trolley wire system consisting of a light projector that illuminates the sliding surface of the trolley wire, an image receiver that receives reflected light from the sliding surface, and a mirror that maintains the optical path length from the sliding surface to the image receiver at a constant value. In the wear measuring device,
One projector is provided near the left and right sides of the image receiver, and by fixing the projector to the image receiver, the optical path length between the trolley wire sliding surface and the projector is maintained constant, and the two projectors are fixed. The projected light beams intersect in front of the trolley wire, and each projected beam divides the deflection range of the trolley wire into two and illuminates the right and left ranges, and the projected light from the top wall of the tunnel A projector for measuring wear of a trolley wire, characterized in that the angle of the projecting beam is set so that reflected light of the beam cannot be input to an image receiver.