JPH05103407A - Flaw detecting apparatus for overhead wire - Google Patents

Abstract

PURPOSE:To precisely examine the flaws by photographing the coil which is read from a memory after allowing a traveling device running on an overhead wire to travel for a distance between the coil and a camera when one output of a plurality of flaw detection coils mounted in the longitudinal direction on the traveling device exceeds a given value. CONSTITUTION:A plurality of flaw detection coils 16A to 16D are mounted distributively in the longitudinal direction on a traveling device running on an overhead wire. The output of each of the coils 16A to 16D is inputted into a photographing control unit 2B through each of the controllers 30A to 30D. The output of one coil, the coil 16A, for example, is processed by a waveform adjustment (21) to compare it with the fiducial value of a set value register 23 for judgment. If the output exceeds the fiducial value, the distance between the coil 16A and a camera 13 is read from a distance data storage 26 and inputted into a subtracting counter. The rotation of the wheel 3 of the traveling device is encoded (27) and inputted into a subtracting counter 25. When the counted value becomes zero, the camera 13 is controlled through a photographing control unit 28 to photograph the flaws. Thus, the flaws are precisely photographed closely to make it easy to analyze them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead line flaw detector for detecting flaws in overhead lines such as high voltage power lines.

[0002]

2. Description of the Related Art A high voltage power transmission line is formed by twisting a large number of strands. If these strands are damaged or one of them breaks due to wind-induced vibration or various natural disasters, power loss due to corona discharge or various accidents may occur. .. Therefore, an overhead wire flaw detector is used to regularly inspect the outer surface of the overhead wire. FIG. 3 shows a side view of a conventionally known overhead wire flaw detector. In the figure, this overhead wire flaw detector 1
Are housed in a frame 2, and a pair of wheels 3 are attached to the front and rear of the frame. The wheels 3 are configured to run on overhead lines 4. Each wheel 3
Are both driven by a motor 5 via chains 6 and 7. Thereby, the device travels on the overhead wire 4 in the direction of the arrow 8, but an obstacle sensor 9 is provided to detect various obstacles attached to the overhead wire 4. A flaw detection unit 11 and a control unit 12 are housed inside the frame 2. The flaw detection unit 11 is equipped with a flaw detection coil described later.

As described above, when the apparatus 1 travels on the overhead line 4 and the flaw detection section 11 detects a flaw on the overhead line 4 by, for example, an eddy current, the control section 12 records or stores the detection signal. It is stored in the device and the data is transmitted to the receiving device on the ground. On the other hand, in order to actually recognize such a scratch with the naked eye, a camera 13 for taking a photograph of the scratch is attached. As shown in FIG. 4, a roof-shaped mirror 14 is arranged above the camera 13 so as to cover the overhead wire 4. As a result, the rear surface of the overhead line 4 is projected on the mirror 14, and the camera 13 can capture the entire circumference of the overhead line 4.

[0004]

By the way, the structure of the flaw detection portion 11 as described above is as shown in FIG.
In FIG. 5A, for example, four flaw detection coils 16A, 16B, 16C, 16D are arranged in point symmetry on the outer circumference of the overhead wire 4. Here, in practice, for the convenience of a mechanism for supporting each coil and other arrangements, a pair of flaw detection coils symmetrically arranged with the overhead wire 4 as a boundary is used as a set, and these are installed in the longitudinal direction of the overhead wire 4. The positions are shifted from each other in the direction. That is, as shown in FIG. 5 (b), the pair of flaw detection coils 16A and 16C are arranged at substantially the same position with the overhead wire 4 interposed therebetween, and the remaining pair of flaw detection coils 16B are separated by a distance X. 16D is arranged.

Here, when the apparatus shown in FIG. 3 travels in the direction of arrow 8 and any flaw detection coil detects a flaw on the overhead line 4, after traveling for a certain distance after the detection, the photographing apparatus of FIG. 13 is controlled to operate the shutter. That is, when the flaw detection coil of the flaw detection unit 11 detects a flaw on the overhead wire 4, the flaw can be clearly photographed by operating the shutter of the camera 13 when the flaw reaches the center of the mirror 14. However, as shown in FIG. 5, for example, the four flaw detection coils 16A to 16D are not all in the same position when viewed in the longitudinal direction of the overhead wire 4. Therefore,
The position of the flaw in the photographed picture is not always constant depending on the coil that detected the flaw. Therefore, there is a problem that it is relatively difficult to match the electric signal at the time of finding the flaw recorded in the control unit 12 shown in FIG. 3 and the photograph of the taken flaw.

The example shown in FIG. 5 is an example in which four flaw detection coils are used. However, even when six flaw detection coils are arranged on the radiation, flaw detection coils are prevented in order to prevent interference between the flaw detection coils. The coils must be dispersed and arranged in the longitudinal direction of the overhead wire, and therefore the flaw detection coil at the front end and the flaw detection coil at the rear end are displaced by, for example, about 200 mm in the longitudinal direction. .. Therefore, the scratch position in the image that fits in the photograph will further fluctuate back and forth. In addition, in order to absorb the deviation of the shooting timing, it is necessary to lengthen the length of the electric wire included in the photograph. Therefore, it is necessary to widen the field of view of the camera by increasing the distance between the camera and the electric wire or by using a wide-angle lens. However, this has a problem that the flaw on the overhead line cannot be photographed so much that the analysis becomes difficult. The present invention has been made in view of the above points, and an object thereof is to provide an overhead wire flaw detector capable of accurately and clearly photographing a flaw on an overhead wire detected by a flaw detection coil. is there.

[0007]

An overhead wire flaw detector according to the present invention comprises a traveling mechanism for traveling on an overhead wire, and a plurality of flaw detection coils mounted on the traveling mechanism and distributed in the longitudinal direction of the overhead wire. A photographing device mounted on the traveling mechanism for photographing the outer surface of the overhead wire, a judgment unit for judging and comparing whether or not the output signal of each flaw detection coil exceeds a set value, and a photographing unit between each flaw detection coil and the photographing equipment. A distance data storage unit that stores distance data indicating a distance, and when the output signal of any one of the flaw detection coils exceeds a set value, the corresponding distance data stored in the distance data storage unit is read and the traveling mechanism is used. And a photographing control unit for causing the photographing device to perform photographing after traveling the corresponding distance.

[0008]

In this device, when any of the plurality of flaw detection coils detects flaws on the overhead wire, the photographing timing is adjusted according to the distance data between the flaw detection coils and the photographing device stored in advance in the storage section. Therefore, no matter which flaw detection coil detects a flaw, the flaw is always displayed almost in the center of the photographed image, and the photographer can be brought close to the overhead line to take a precise photograph.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 shows a circuit block diagram used in the overhead wire flaw detector of the present invention. This circuit is housed inside the control unit 12 shown in FIG. 3, and one set is provided for each of the plurality of flaw detection coils. In the following description of the embodiments, an apparatus having four flaw detection coils will be described, and each coil will be referred to as an A coil 16A and a B coil 1 respectively.
6B, C coil 16C, and D coil 16D will be described below. The circuit shown in the figure includes a waveform shaping section 21 that receives the output of the A coil 16A, a comparison determination section 22 that receives the output and compares it with the output of the set value register 23, an AND gate 24, a subtraction counter 25, and a distance data storage section. Two
Have six. Further, the subtraction counter 25 has the wheels 3
Is connected so that the count pulse is input from the encoder 27 that detects the rotation of the. The output of the subtraction counter 25 controls the operation of the photographing control unit 28,
The photographing control unit 28 controls the photographing device 1 according to a signal input from
3 has a circuit configuration for controlling to operate the shutter.

The circuit shown operates as follows. When the A coil 16A detects a flaw on the overhead line, it outputs a pulsed electric signal. The waveform shaping section 21 is a circuit having a well-known configuration that shapes the electric signal into a pulse-shaped electric signal corresponding to the signal level. The setting value register 23 is A
A signal having a level slightly lower than the signal level output when the coil 16A actually detects a flaw is configured to be output to the comparison / determination unit 22. As a result, noise and the like are removed, and the comparison / determination unit 22 outputs the A coil 16
When A detects a flaw, a high level signal is output. The output of the comparison / determination unit 22 is input to the AND gate 24 and the load terminal of the subtraction counter 25.

On the other hand, the output signal of the distance data storage unit 26 is input to the AND gate 24. The distance data storage unit 26 stores data corresponding to the distance between the A coil 16A and the camera 13. This data is composed of, for example, a digital signal of about 4 bits. When the output of the comparison / determination unit 22 input to the AND gate 24 becomes high level, the distance data is input to the subtraction counter 25. At this time, the output of the comparison / determination unit 22 is simultaneously input to the load terminal of the subtraction counter 25, so that the subtraction counter 2
The signal output from the distance data storage unit 26 is loaded in 5. On the other hand, when the wheel 3 rotates by a certain angle, one pulse is input from the encoder 27 to the subtraction counter 25.

Therefore, when the device travels and the wheels 3 rotate, the number of pulses corresponding to the traveled distance is input to the subtraction counter 25. This pulse is 1 for the subtraction counter 25.
The distance data is decremented by 1 each time each piece is input. As a result, when the device travels the distance corresponding to the distance data, the output of the subtraction counter 25 becomes 0, and then the borrow signal is output to the photographing control unit 28. The photographing control unit 28 operates the shutter of the photographing device 13 at the timing when this signal is input. As a result, the A coil 16
A detects a flaw on the overhead line, and the device detects the distance data storage unit 2
After traveling for a certain distance stored in No. 6, shooting is performed. Therefore, the camera can clearly shoot the flaw detected by the A coil in the exact center of the picture. If the circuit as described above is provided for each coil, the optimum mileage will be calculated for each coil.
The shutter of the camera operates, and you can always clearly and clearly photograph scratches on the overhead line.

FIG. 1 (b) shows a block of such an entire circuit. As shown in the figure, A coil control unit 30A
Includes a circuit from the waveform shaping unit 21 to the subtraction counter 25 shown in FIG. 1A, and has a B coil control unit 30B, a C coil control unit 30C, and a D coil control unit 30D having the same configuration. The output of the
You will be connected to enter. The photographing control unit 28 accepts a signal input from any of the coil control units, and performs the photographing operation of the photographing device 13 at that timing.

In some cases, after one flaw detection coil detects a flaw on an overhead line and before the photographing device 13 photographs the flaw, the same flaw detection coil may detect another flaw. In such a case, only the circuit shown in FIG. 1 rewrites the contents of the subtraction counter each time, and it is not possible to photograph all scratches. FIG. 2 shows a block diagram of an apparatus having a configuration capable of photographing such a plurality of scratches. The AND gate 24 in the figure and the distance data storage unit 2
6 and the photographing control unit 28 and the constitution of the photographing device 13 are the same as those shown in FIG. Here, the output of the AND gate 24 is input to the counter selection unit 32, and the first subtraction counter 25-1, the second subtraction counter 25-2, or the third subtraction counter 25 is input via the counter selection unit 32.
Wired for input to 25-3. Counter selection unit 3
Reference numeral 2 is a circuit that operates similarly to, for example, a rotary switch, and is connected such that when distance data is first input from the AND gate 24, that signal is input to the first subtraction counter 25-1. Then, the first subtraction counter 25
When the loading to -1 is completed, the output direction of the counter selection unit 32 is switched to the second subtraction counter 25-2.

Therefore, when the distance data is input via the AND gate 24 immediately after that, the distance data is input to the second subtraction counter 25-2. When the loading of the counter selection unit 32 is completed, the third selection counter 25-3
Switch the output direction to. By performing such an operation, the three subtraction counters 25-1, 25-2, 25-3 are sequentially switched and used, and even if three flaws are continuously detected by one flaw detection coil, all the flaws will not be missed. You can shoot. It goes without saying that more scratches can be continuously photographed by increasing the number of subtraction counters shown in FIG. The present invention is not limited to the above embodiments. The circuit that processes the output of the flaw detection coil, the configuration of the storage unit that stores the distance data, the imaging control method that uses the distance data, and the like may be replaced with various circuits having equivalent functions.

[0016]

As described above, in the overhead wire flaw detector of the present invention, even if a plurality of flaw detection coils are relatively widely distributed in the longitudinal direction of the overhead wire, the flaws detected by the respective coils are always photographed. You can shoot in the center of. Therefore, it is possible to bring the photographing device close to the overhead line, accurately photograph the flaw, and facilitate work such as analysis of the flaw.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a circuit used in an overhead wire flaw detector of the present invention, in which (a) is a main part thereof and (b) is an overall block diagram thereof.

FIG. 2 is a block diagram showing a modified example of the device of the present invention.

FIG. 3 is a side view of a conventional overhead wire flaw detector.

4 is a cross-sectional view taken along the line YY of FIG.

FIG. 5 shows the relationship between the flaw detection coil and the overhead wire,
(A) is a front view and (b) is a side view.

[Explanation of symbols]

 3 Wheels (part of traveling mechanism) 13 Camera 16A A coil (flaw detection coil) 16B B coil (flaw detection coil) 16C C coil (flaw detection coil) 16D D coil (flaw detection coil) 21 Waveform shaping section 22 Comparison judgment section 23 Setting Value register 24 AND gate 25 Subtraction counter 26 Distance data storage unit 28 Imaging control unit

Claims (1)

[Claims] 1. A traveling mechanism that travels on an overhead wire, a plurality of flaw detection coils mounted on the traveling mechanism and distributed in the longitudinal direction of the overhead wire, and an outer surface of the overhead wire mounted on the traveling mechanism. A photographing device for photographing, a judgment unit for judging and comparing whether or not the output signal of each flaw detection coil exceeds a set value, and a distance data storage unit storing distance data indicating a distance between each flaw detection coil and the photographing device. When the output signal of any one of the flaw detection coils exceeds a set value, the corresponding distance data stored in the distance data storage unit is read out, and after the traveling mechanism travels a corresponding distance, An overhead line flaw detector, comprising: an imaging control unit for executing imaging.