JPH02236156A - Apparatus for inspecting overhead wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an overhead wire inspection device for inspecting the outer surface of overhead wires and flaws in strands.

(Prior Art) For example, overhead lines such as ACSR are often installed through mountainous areas, and are frequently damaged by lightning. The degree of damage varies widely, from slight damage to damage such as partial wire breakage, which cannot be left untreated. Breakage of the strands causes corona discharge and reduces the tensile strength of the overhead wire, which may lead to major accidents such as breakage. Therefore, inspection devices that automatically detect flaws over the entire length of overhead wires have been developed.

FIG. 5 shows a schematic configuration diagram of a conventional overhead wire inspection device.

In the figure, this device has a pair of driving wheels 3 so that it can run on the overhead wire 1 by itself, and these driving wheels 3 are moved along the overhead wire 1 by an arrow 10 by a drive unit 4 such as a motor.
It is driven to move in direction a. Furthermore, several flaw detection coils 5 are provided inside this device, and are positioned by guide wheels 6 that maintain a predetermined distance from the overhead wire 1. The guide wheels 6 are provided so as to trace the outer peripheral surface of the overhead wire 1. Coil holder 7 that supports each flaw detection coil 5
is movably suspended from the frame 2 of the device in the direction of the arrow 10b using a hanging fitting 8. This hanging fitting 8 absorbs the vertical vibration of the coil holder 7, and functions together with the guide wheel ring 6 to maintain the distance between the flaw detection coil 5 and the overhead wire 1 at a predetermined distance.

A control section 9 is provided to process the output signal of the flaw detection coil 5 or to output a predetermined drive signal to the drive section 4. On the other hand, a camera 11 and a mirror 12 are arranged on the rear side of the frame 2 so as to sandwich the overhead wire 1 therebetween. The above device operates as follows.

First, the drive unit 4 rotates the drive wheels 3 and causes the frame 2 to run at a constant speed along the overhead line 1 in the direction of the arrow 10a in the figure. While the frame 2 is running, the flaw detection coil 5 detects flaws on the outer surface of the overhead wire 1 using eddy current or the like while maintaining a predetermined distance from the overhead wire 1. And if overhead line 1
When more than a certain number of scratches are detected on the surface, the control section 9 records the detection signal and operates the camera 11 to take a photograph of the outer surface of the overhead wire 1. The mirror 12 is provided for photographing the backside portion of the overhead wire l that cannot be directly photographed by the camera 11.

(Problem to be solved by the invention) By the way, in areas where there is a lot of snow in the winter, in order to prevent snow from adhering to the overhead lines, a snow accretion prevention device called an anti-snow ring is installed on the overhead lines. Installation is in progress.

FIG. 6 shows the state in which the anti-snow ring is installed.

A bracelet-shaped ring 13 having concave portions on its outer circumferential surface at predetermined intervals is attached to the overhead wire l.

FIG. 7 shows a perspective view of this anti-snow ring before it is installed.

As shown in the figure, the anti-snow ring 13 is attached to the overhead wire by fitting its protrusion 13a into the recess 13b.

In order to facilitate this operation, the anti-snow ring 13 is provided with a bent portion 13c. Usually, this is manufactured by integrally molding plastic such as vinyl chloride resin. In addition, the installation interval to the overhead wire is 30cm to 50cm.
It is said to be about m.

If the apparatus shown in FIG. 5 is used to detect flaws in the overhead wire 1 to which the anti-snow ring 13 is attached, the following problem will occur.

First, when the guide wheel 6 that holds the flaw detection coil 5 shown in FIG.
vibrates. When the flaw detection coil 5 performs flaw detection by electromagnetic induction, if the flaw detection coil 5 vibrates, its output signal will be disturbed. This output signal is similar to the output signal when the outer surface of the overhead line l is damaged, and there is a possibility that the control unit 9 may mistakenly recognize that there is damage on the surface of the overhead line l. On the other hand, when the driving wheels 3 shown in FIG. 5 run on the overhead wire 1 and pass over the anti-snow ring 13 shown in FIG. 6, the frame 2 vibrates. Therefore, if the camera 11 is operating at that time, the captured image will be distorted.

Also, the direction of the camera when taking pictures. Relationship with light. Focus. Exposure. The system maintains a constant running speed and the quality of the photos taken to improve the efficiency of damage analysis.

Therefore, the distance between the camera 11 and the overhead wire l may change,
If the camera 11 vibrates, stable shooting conditions cannot be maintained and analysis becomes extremely difficult. The present invention has been made with attention to the above points, and an object of the present invention is to provide an overhead wire inspection device that can stably and accurately perform inspections such as flaw detection on overhead wires without errors.

(Means for Solving the Problems) The overhead wire inspection device of the present invention includes wheels that support the device and rotate in contact with the overhead wire, and a side facing the overhead wire when the device runs on the overhead wire. a guide circumscribing the anti-snow ring attached to the overhead line and elastically supporting the guide wheel so that the wheel elastically retreats in a direction away from the overhead line due to an external force. The present invention is characterized by comprising a retraction support means.

(Function) In the above device, when the anti-snow ring is not attached to the overhead wire, the guide wheels hold the device on the overhead wire. On the other hand, when the anti-snow ring is attached, a guide circumscribing the outer peripheral surface of the anti-snow ring holds the device.

On the other hand, if the device is run along an overhead line with the guide circumscribing the anti-snow ring, the guide wheels will interfere with smooth running. Therefore, the guide wheels are elastically supported by evacuation support means, and when climbing over the difficult-to-snow ring,
Elastically evacuate in the direction away from the overhead wire. As a result, the device maintains a constant posture on the overhead wire and runs stably.

(Example) Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the overhead wire inspection device of the present invention. Further, FIG. 2 shows a right side view thereof, and FIG. 3 shows a top view thereof.

The configuration of the overhead wire inspection device of the present invention will be explained using these figures.

First, as shown in FIG. 1, this device is equipped with a coil holder 22 that fixedly supports a flaw detection coil 21 in the center. A screw 21a is provided on the outer wall of this coil holder 22, and by tightening this screw 21a,
The flaw detection coil 21 is fixed inside the coil holder. In addition, on the surface of the coil holder 22 facing the overhead wire l,
A guide 23 having a shape similar to a ski is arranged so as to extend in the longitudinal direction of the overhead line 1. This guide 2
3 is selected to be a length that circumscribes two or more anti-snow rings l3 at the same time.

On the other hand, an upper arm 22a and a lower arm 22b are attached to the upper end and side surface of the coil holder 22, respectively, in parallel with the overhead wire 1. And the lower arm 22
b includes a guide wheel support frame 2 that supports the guide wheels 24;
5 is attached to swing in the direction of arrow 31 about shaft 25a. The guide wheel 24 is rotatably attached to the guide wheel support frame 25 by a shaft 24a.

Furthermore, the guide wheel support frame 25 has a projection 25 at its upper end.
b is provided. One end of the spring 26 is fitted into the projection 25b, and the other end of the spring 26 is fitted into the projection 27b of the spring holding pin 27. Spring presser bottle 2
7 is attached to the upper arm 22a so as to swing in the direction of arrow 32 about a shaft 27a.

That is, the guide wheel support frame 25 swings in the direction of arrow 31, as shown in the left half of FIG. move. The springs 26 fitted into the protrusions 25b and 27b are configured to expand and contract in an arcuate manner as shown in the figure as the two protrusions 25b and 27b swing. Incidentally, as shown in FIG. 2, the tip of the ski 23 is
It is divided into fork shapes in the longitudinal direction, and is configured to smoothly circumscribe the outer peripheral surface of the anti-snow ring 13 attached to the outer periphery of the overhead wire 1.

Further, as shown in the top view of FIG. 3, the skis 23 are configured to extend sufficiently long in the longitudinal direction of the overhead line 1. FIG. 4 shows an exploded schematic perspective view of essential parts of the apparatus of the present invention.

The device of the present invention has a coil holder 2 as shown in this schematic diagram.
An upper arm 22a is provided at the upper end of 2, and a guide 23 is provided at the lower end.
, and a lower arm 22b is provided on the side surface. A guide wheel support frame 25 and a spring holding pin 27 as shown on the right side of the figure are attached to the lower arm 22b and the upper arm 22a, respectively. There is. The above device operates as follows. The device shown in FIG. 1 is assumed to be replaced with the coil holder 7 described in FIG. 5.

Now, as shown in FIG. 1, the device of the present invention is arranged in advance so that the coil holder 22 is elastically pressed toward the overhead line 1 via a spring or the like (not shown). Then, when the device moves in the direction of arrow 10a,
If the anti-snow ring 13 is not installed on the overhead line 1,
The guide wheel 24 is supported by the guide wheel support frame 25 in the state shown on the right side of FIG. 1, and rotates while contacting the outer peripheral surface of the overhead wire 1. Thereby, the coil holder 22 and the flaw detection coil 21 are held at a position separated from the overhead wire 1 by a certain distance and run on the overhead wire 1. On the other hand, when the anti-snow ring 13 is attached to the overhead line l, when this device runs over it, the guide 23 circumscribes the anti-snow ring 13,
Slide the coil holder 22 in the direction of the arrow 10a.

As a result, the coil holder 22 faces the overhead line 1 with a distance exactly corresponding to the thickness of the anti-snow ring l3. The length of the guide wheel support frame 25 to which the guide wheel 24 is attached is selected so that the guide wheel 24 is exactly in contact with the overhead wire 1 in this state.

Now, when the device travels in the direction of the arrow 10a, the guide wheels 24 move around the anti-snow ring l as shown on the left side of the figure.
Collision with 3. And when trying to overcome this,
The guide wheel support frame 25 swings in the direction of arrow 31, and the guide wheel 24 moves as shown in FIG. Evacuate above. At this time, the spring 26
is bent in an arch shape as shown in the figure. After getting over the anti-snow ring 13, the elasticity of the spring 26 returns the guide wheel support frame 2 to the state shown on the right side of FIG.
5 and the spring presser pin 27 are returned.

By repeating such an operation, the coil holder 22 moves along the arrow 10a without vibrating along the overhead wire 1.
Drive in the direction.

In the present invention, when the guide wheel 24 rides over the anti-snow ring 13, it is elastically retracted in the direction away from the overhead line 1 due to the external force, so that when the guide wheel 24 rides over the anti-snow ring 13, it is elastically retracted in the direction away from the overhead line 1. , the coil holder 22 is substantially held in position by the guide 23.

In the device of the present invention, the guide wheel support frame 25, spring 26, and spring holding bin 27 are collectively referred to as a retraction support means. , or any other configuration is acceptable. Further, in the above embodiment, an example was explained in which the retraction support means was attached to the guide wheel that directly supports the coil holder 22, but the drive wheel 3 that supports the frame 2 that accommodates the coil holder shown in FIG. , it is safe to apply similar ideas.

That is, if the above configuration is applied to the drive wheels 3,
The frame 2 itself runs along the overhead wire 1 without vibration. As a result, camera 1 fixed to frame 2
1 can be prevented from vibrating during the photographing operation or from changing its positional relationship with the overhead wire 1. As described above, the wheels may be guide wheels, and the device supported by the wheels may be a coil holder or the entire inspection device. Furthermore, the device may be one that does not have a flaw detection coil and is only equipped with other inspection devices such as a camera.

(Effects of the Invention) The above-described overhead wire inspection device of the present invention, when the anti-snow ring is mounted on the overhead wire, uses a guide that slides circumscribed to the anti-snow ring to adjust the distance between the coil holder and the overhead wire, for example. is held constant. And the guide wheel
Since the coil holder is elastically supported so as to be elastically retracted in a direction away from the overhead wire due to an external force, vibration of the coil holder can be prevented when the device is running.

Moreover, if the above configuration is applied to the drive wheels, vibration of the device itself can be prevented. This makes it possible to stabilize the output of the flaw detection coil and also stably support the camera for photographing the overhead wire. Therefore, improving the accuracy of inspection,
Furthermore, it is possible to easily analyze the photographic results.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the overhead wire inspection device of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a top view thereof, Fig. 4 is an exploded schematic perspective view of the main part thereof, and Fig. 5 FIG. 6 is a schematic configuration diagram showing an example of a conventional overhead wire inspection device, FIG. 6 is a side view of the overhead wire equipped with a snow prevention ring, and FIG. 7 is a perspective view of the snow prevention ring. 1---1---1-11 Overhead line, 1 3---1111 Snow accretion difficult ring, 2 1---
11-1-1 flaw detection coil, 22-11-1--coil holder, 2 3--11-guide, 24--1--1 guide wheel, 25. 26.27-11 Evacuation support means. (Other names) Figure 5 Figure 7

Claims (1)

[Claims] When the device runs on the overhead wire, wheels that support the device and rotate in contact with the overhead wire, and wheels that are placed on the side facing the overhead wire and circumscribe the anti-snow ring attached to the overhead wire. An overhead wire inspection device comprising: a guide for moving the guide wheel; and a retraction support means for elastically supporting the guide wheel so that the wheel is elastically retracted in a direction away from the overhead wire due to an external force.