JPH01229953A - Flaw detecting apparatus for overhead wire - Google Patents

Abstract

PURPOSE:To make it to pass an apparatus along an overhead wire at the curved large-diameter part, by attaching a coil holder to a roller holding part with an elastic linking plate and a hinge, holding the holder so that it can be moved in all directions, and supporting the holder with the overhead wire. CONSTITUTION:One end of each of two linking plates 34 is attached to a roller holding part (not shown) with pins, and the other end thereof is attached to a hinge 33 with pins. Each pins is in a loosely fixed state in a long hole and the like so as not to hinder the operation of the linking plate 34. The hinge 33 is attached to the upper part of a coil holder 32. The coil holder 32 can be moved in all the directions including the up and down and right and left directions and the rotating direction with respect to the axial part of an overhead wire 1 by the movement of the linking plate 34. The holder 32 moves on the wire 1. When the holder passes the curved large-diameter part on the wire 1, guide rollers 35 which are attached to holder half parts 32a and 32b are brought into contact with the large-diameter part. The holder half parts 32a and 32b are expanded on the hinge 33. The entire holder 32 is turned on a shaft 38. The linking plate 34 is pushed up. Thus the holder can pass the large-diameter part. After passing, the apparatus is returned to the home position by the elasticity of the linking plate and the weight of the holder 32.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a flaw detection device for overhead electric wires for detecting flaws in overhead electric wires, breaks in strands, etc.

(Technical background of the invention and its problems) Overhead power transmission lines and overhead ground wires are constructed by twisting together a large number of strands of wire, but they are often installed in high places such as mountains, and can easily be damaged by lightning strikes. The strands of the wire may melt or melt. Furthermore, the wire may be damaged or broken.

If these scratches and disconnections are left untreated, there is a risk of reducing power transmission efficiency and causing radio interference due to corona discharge.

For this reason, workers have conventionally inspected overhead wires directly with their naked eyes or using binoculars.

However, in mountainous areas, etc., it is difficult to inspect the entire circumferential surface of overhead electric wires, and since this is done manually, it is difficult to reliably detect all flaws, breaks, etc. in the wires.

Therefore, recently, a self-propelled flaw detection device is attached to the overhead electric wire, and this flaw detection device is run on the overhead electric wire to detect flaws, breaks, etc. in the wire.

This flaw detection device uses a detection coil to generate an eddy current in an overhead wire and measures the impedance change at that time.

By the way, sleeves for covering and protecting connecting portions between overhead electric wires, armor rods for preventing bending of the overhead electric wires, and the like are provided at various places on the overhead electric wires. When the flaw detection device passes through a large-diameter portion of an overhead wire on which these sleeves and the like are installed, the coil holder must be moved to match the large-diameter portion.

FIGS. 4 and 5 show a front view and a side view of a conventional flaw detection device for overhead electric wires.

In the figure, the overhead wire flaw detection device includes a pair of running rollers 2. These running rollers 2 are engaged on the overhead electric wire 1, and are rotatably penetrated through a frame 3 disposed perpendicularly to the side of the overhead electric wire 1.
They are each fixed to the shaft 4 of the book. A sprocket 5 is attached to each shaft 4, and a sprocket 6 is arranged between the two sprockets 5. This sprocket 6 is connected to an input shaft of an encoder 7 (FIG. 5) via a gear mechanism (not shown). A motor 8 is fixed to the lower part of the frame 3, and a sprocket 9 is attached to the output shaft of the motor 8. A chain 10 is attached to the sprockets 5, 6, and 9. Therefore, when the motor 8 is rotated, the sprocket 6.5 rotates via the sprocket 9. Therefore, the traveling roller 2 also starts rotating, and the flaw detection device moves on the overhead wire. Further, along with this movement, the encoder 7 outputs a number of pulses corresponding to the moving (traveling) distance.

A cylindrical coil holder 11 is arranged between the two running rollers 2. The coil holder 11 is suspended from one end of the bracket 13 by two hanging shafts 12 so as to be vertically movable. An L-shaped angle 14 is attached to the lower edge of the frame 3, and a housing 15 is supported.

The housing 15 houses a flaw detection circuit, a drive circuit, a recording section, a receiving section, and the like. Further, a support rod 16 is attached to the end of the frame 3, and a camera 17 is attached to the upper part of this support rod 16, and a mirror 18 is attached to the lower part.

FIG. 6 shows a side view of the coil holder 11.

In the figure, the coil holder 11 includes a holder half 11a,
It has a two-sided structure consisting of llb. Holder half 1
1a and llb are connected to each other via a hinge 19,
A lock member 20 for closing is attached to the opposite side of the hinge 19. A through hole 11c is formed in the center of these holder halves 11a, llb. In addition, holder half 1
A substantially saddle-shaped bushing 21 that contacts the upper half of the overhead wire 1 is bolted to 1a. Inside the coil holder 11, six detection coils 22 are arranged radially every 60 degrees around the overhead electric wire l. Therefore, when the overhead wire 1 is passed through the through hole 11c of the coil holder 11, the bushing 21 comes into contact with the upper surface of the overhead wire 1, and the coil holder 11 aligns the center of the through hole 11c with the center of the overhead wire 1. is maintained in the same position.

In the overhead wire flaw detection apparatus having the above configuration, the coil holder 11 moves up and down in the axial direction of the hanging shaft 12 when passing through the large diameter portion of the overhead wire 1 . As a result, the overhead electric wire 1a passes as indicated by the broken line in the figure. However, the large diameter portion may form a curve in a direction perpendicular to the hanging shaft 12. In such a case, the coil holder 11 may not be able to pass through this large diameter portion simply by moving up and down.

(Objective of the Invention) The present invention has been made with attention to the above points, and is capable of holding a coil holder so that it can be moved not only up and down but also in all directions, and is capable of holding a coil holder so that it can be moved not only up and down but also in all directions. It is an object of the present invention to provide a flaw detection device for overhead electric wires that can pass through curved large-diameter portions.

(Summary of the Invention) The flaw detection device for overhead electric wires of the present invention comprises: a running roller that engages on an overhead electric wire; a frame that supports this running roller; a coil holder that moves along the overhead electric wire in accordance with the movement;
In an overhead wire flaw detection apparatus comprising a holding mechanism for attaching the coil holder to the frame, the holding mechanism supports the coil holder movably in all directions, and
The coil holder is supported by the overhead electric wire.

(Embodiments of the Invention) FIG. 1 shows a perspective view of a flaw detection device for overhead wires according to the present invention.

In the figure, the overhead wire flaw detection device includes a pair of running rollers 25. These running rollers 25 are engaged on the overhead electric wire l, and both ends thereof are provided with roller holding portions 26.
is held in The two roller holding parts 26 are connected by two connecting vibes 27. A cylindrical coil holder 32 is arranged between the two running rollers 25 . The coil holder 32 is suspended from the roller holding portion 26 by a hinge 33 and two link plates 34 so as to be rotatable in all directions. U-shaped frames 28 are attached to both ends of the roller holding section 26, respectively. A connecting vibe 29 is attached to the lower portions of the two U-shaped frames 28. A support plate 30 is attached to the upper part of the connecting vibe 29, and a housing 31 is attached to the support plate 30. The housing 31 houses a circuit (not shown) such as a flaw detection circuit. In addition, in the present invention, the roller holding part 26, the connecting vibrator 27, 29, the 0-shaped frame, and the support plate 30 are collectively referred to as a frame, and the hinge 33 and the link plate 34 are collectively referred to as a frame.
These will be collectively referred to as the holding mechanism.

FIG. 2 shows a front view of essential parts of the flaw detection device for overhead wires according to the present invention.

The figure shows a coil holder 32, a hinge 33, and a link plate 3.
4 and a roller holding section 26 are shown.

One end of the two link plates 34 is attached to the roller holding part 26 by a pin 35, and the other end is attached to the hinge 33 by the pin 36.
It is installed by Further, a hinge 34a is arranged in the middle of the link plate 34. The bins 35 and 36 are loosely attached by elongated holes or the like so as not to interfere with the operation of the link plate 34. The link plate 34 is bent at the hinge 34a and is movable in the vertical direction. Also,
The coil holder 32 is always supported by the overhead electric wire 1 and its center coincides with the center of the overhead electric wire 1 because the link plate 34 is movable in all directions including up, down, left and right, and the direction of rotation with respect to the shaft portion of the overhead electric wire 1. so that it is held in place.

FIG. 3 shows a side view of the coil holder according to the present invention.

The figure shows a coil holder 32, a hinge 33, and a link plate 3.
4 is shown.

In the figure, the coil holder 32 includes a holder half 32a,
32b, on the ends of which bushes 36a, 36b with guide rollers 35 are attached. A hinge 33 is attached to the upper part of the coil holder 32. The hinge 33 has opening/closing parts 37a and 37b.
, a shaft 38, and three hanging parts.

The opening/closing parts 37a and 37b of the hinge 33 are connected to the holder half part 32a.
, 32b, respectively. Opening/closing part 3”
The upper parts of 7a and 37b are fitted into the shaft 38. Both ends of the shaft 38 are fitted into hanging parts 39.

A link plate 34 is attached to the upper part of the hanging portion 39 of the hinge 33 by a pin 36.

The hinge 33 configured as described above can open and close the coil holder 32 centering on the shaft 38. During normal overhead wire flaw detection, the holder halves 32a and 32b remain closed.

Now, referring back to FIG. 1, the operation of the overhead wire flaw detection device will be explained.

This device moves on the overhead electric wire 1 while passing the overhead electric wire 1 through the center of the coil holder 32.

At this time, the center of the overhead wire 1 and the center of the coil holder 32 are aligned with each other due to the elastic force of the link plate 34 to ensure a fixed position.

When passing through a linear large-diameter portion on the overhead electric wire 1, the guide roller 35 shown in FIG.
, 32b are pushed apart around the hinge 33 and passed through, and then returned to the normal position by the elasticity of the link plate 34 and the weight of the coil holder 32. When passing through a curved large-diameter portion on an overhead wire, the guide roller 35 comes into contact with the large-diameter portion,
While pushing the holder halves 32a and 32b apart, the entire coil holder 32 is rotated about the shaft 38, and the link plate 34 is further pushed upward.

In this way, the coil holder 32 can change its orientation in all directions, such as up, down, right and left, with respect to the overhead wire 1, and passes through the curved large diameter portion.

The present invention is not limited to the above embodiments.

Instead of the link plate 34, a leaf spring or the like having a predetermined elasticity may be used. Also, the shape of the hinge 33, the bushing 36
The configurations of a, 36b, etc. may be replaced with various known equivalent means.

(Effects of the Invention) In the above-described flaw detection device for overhead wires of the present invention, since the holding mechanism is composed of a resilient link plate and a hinge, the coil holder can be moved in all directions, and The coil holder can be quickly returned to its home position by quickly passing through not only the straight large diameter portion but also the curved large diameter portion on the wire.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flaw detection device for overhead wires according to the present invention, FIG. 2 is a front view of main parts of the flaw detection device for overhead wires according to the present invention, and FIG.
4 is a front view of a conventional flaw detection device for overhead wires, FIG. 5 is a side view of a conventional flaw detection device for overhead wires, and FIG. 6 is a side view of a conventional flaw detection device for overhead wires. FIG. 32--------- Coil holder, 33------
------One hinge, 34------------Link plate, 34a---Hinge, 35.36--------- Bin. (1 other person) Figure 3 Figure 5

Claims (1)

[Claims] A running roller that engages on an overhead electric wire, a frame that supports the running roller, and a coil holder through which the overhead electric wire is passed and moves along the overhead electric wire as the running roller rolls. , an overhead electric wire flaw detection apparatus comprising a holding mechanism for attaching the coil holder to the frame, wherein the holding mechanism supports the coil holder movably in all directions, and supports the coil holder with the overhead electric wire. Flaw detection equipment for overhead power lines.