JPH01229952A - Flaw detecting apparatus for overhead wire - Google Patents

Abstract

PURPOSE:To simplify the structure of an apparatus and to prevent abrasion of a coil holder, by providing the structure of the opening and closing mechanism of a coil holder wherein a motor and gears are used, and providing a guide mechanism on both end surfaces of the coil holder. CONSTITUTION:A releasing-mechanism holding part 16 is fixed at the end part of a supporting rod 15 which is held by a holding member. The upper parts of coil-holder half parts 7a and 7b are coupled into opening and closing shafts 20 and 21 of the holding part 16. Bushes 24 and 25 are attached to the end surfaces of the half parts 7a and 7b. A plurality of rollers 26 are attached to the bushes. Notched parts 24a and 25a are further provided. When this apparatus moves on an overhead wire 1, the half parts 7a and 7b are closed and a through hole 9 is formed. The wire 1 is brought into contact with the rollers 26. Therefore, the wire is not in direct contact with the inner surface of a coil holder 7. When a sensor detects a damper 14, a motor 18 is rotated, and the opening and closing shafts 20 and 21 are rotated through a driving gear 17, a speed reducing gear 19 and opening and closing gears 22 and 23. The half parts 7a and 7b are opened to specified positions. After the specified time passes, the motor 18 reverses, and the half parts 7a and 7b are closed.

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 outer periphery 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 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, dampers for vibration prevention and the like are installed at various places on the overhead electric wire, forming large diameter portions. When the flaw detection device passes through the large diameter part where this damper etc. is installed,
The coil holder must be opened to avoid dampers, etc., and after passing, the coil holder must be closed again.

FIG. 4 shows a front view and a side view of main parts 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. As shown in FIG. These running rollers 2 are engaged on the overhead electric wire 1 and are each pivotally supported by a shaft 3. Both ends of the shaft 3 are fixed to a pair of arms 4. A connecting portion 4a is provided at the end of the arm 4,
A support fitting 5 is fixed to the upper part. A sensor 8 is attached to the connecting portion 4a at a position above the overhead electric wire 1. An air cylinder 6 is fixed to the center of the upper surface of the support fitting 5. A cylindrical coil holder 7 is arranged between the two running rollers 2. The coil holder 7 has a holder half 7a.

7b, with an insertion hole 9 in the center.
The upper part is pivotally supported by a shaft 10. A link mechanism 11 is fixed to the upper outer periphery of the holder half parts 7a, 7b. In the link mechanism 11, a fulcrum 11a is fitted into the shaft 10, and a force point 11b is attached to the piston 6a of the air cylinder 6. A frame body 12 is fixed to the side surface of the arm 4, and a flaw detection circuit, a drive circuit, a recording section, a receiving section, etc. are housed in a housing section 13 at the bottom of the frame body 12.

The flaw detection device for overhead electric wires having the above configuration runs on the overhead electric wire 1 by connecting a traveling device (not shown) or the like to the connecting portion 4a.

Further, a damper or the like installed on the overhead wire 1 is detected by the sensor 8, and the coil holder 7 is opened. The open state of the coil holder 7 is maintained for a predetermined time by a delay circuit (not shown), and then returned to the closed state.

FIGS. 5(a) and 5(b) show side views of essential parts of the flaw detection apparatus for overhead wires described in FIG. 4.

FIG. 5(a) shows the normal state of the overhead wire flaw detection device moving on the overhead wire 1. FIG.

In the figure, since the piston 6a of the air cylinder 6 is in a retracted state, the link rock groove 11 is held in a predetermined state,
The holder halves 7a and 7b of the coil holder 7 are brought into contact with each other. Thereby, the overhead wire flaw detection device moves while bringing the inner periphery of the coil holder 7 into contact with the outer periphery of the overhead wire 1.

FIG. 5(b) shows the state when the overhead wire flaw detection device passes over the damper 14 installed on the overhead wire 1. FIG.

In the figure, when the overhead wire flaw detection device detects the damper 14 using the sensor 8 described in FIG. 4, air is sent to the air cylinder 6. As a result, the piston 6a is brought into the advanced state and the link mechanism 11 is operated. Therefore, the holder halves 7a and 7b are attached to the fulcrum 11a of the link mechanism 11.
, that is, the shaft 10 is the center of the opening operation, and the damper 14
Avoid and pass. After a predetermined period of time has elapsed, that is, after the damper 14 has passed, the air is removed from the air cylinder 6, the piston 6a is retracted, and the link mechanism 11 is returned to its predetermined state. As a result, the holder halves 7a and 7b are closed, returning to the state shown in FIG. 5(a).

However, in the above-configured overhead wire flaw detection device, the opening mechanism for the coil holder 7 is configured using the air cylinder 6 and the link mechanism 11, as explained in FIG. , it is necessary to install an air cylinder, a mini compressor, etc., and also to install air control valves, piping, etc., which increases manufacturing time and cost.

In addition, the weight of the device increases, making it difficult to control and handle. Further, the insertion hole 9 comes into contact with the overhead electric wire 1 and rubs against each other, causing the coil holder 7 to wear out.

(Object of the Invention) The present invention has been made with attention to the above points, and the opening/closing mechanism of the coil holder has a simple structure using a motor, and furthermore, a guide mechanism is provided on the coil holder, and the coil holder is The object of the present invention is to provide a flaw detection device for overhead wires that can prevent wear of the wires.

(Summary of the Invention) The flaw detection device for overhead electric wires of the present invention has a running roller that engages on the overhead electric wire, and an insertion hole through which the overhead electric wire is passed. In an overhead wire flaw detection device comprising a coil holder that moves along an overhead wire, and a detection coil disposed inside the coil holder to face the outer periphery of the overhead wire, the coil holder has the above-mentioned A bushing that forms the insertion hole with a diameter corresponding to the outer diameter of the electric wire is disposed, and the coil holder has a two-part structure that is divided along with the bushing by a surface that includes the overhead electric wire, and the coil holder includes: An opening/closing mechanism is attached to the coil holder to open and close the coil holder so as to allow the large diameter portion of the overhead wire to pass through, and the bushing is provided with an opening/closing mechanism that circumscribes and rolls around the outer periphery of the overhead wire to insert the overhead wire into the center of the insertion hole. A plurality of radially arranged guide rollers are provided for holding.

(Embodiment of the Invention) FIGS. 1(a) and 1(b) are side views of essential parts of an overhead wire flaw detection apparatus of the present invention equipped with an opening/closing mechanism and a guide mechanism.

The present invention differs from the overhead wire flaw detection device described in FIG. 4 in the opening/closing mechanism and the structure of the coil holder. Therefore, description of parts that overlap with those in FIG. 4 will be omitted.

In the figure, a support rod 15 is held by a holding member (not shown), and an opening mechanism holding portion 1 is attached to the end of the support rod 15.
6 is fixed. A motor 18 to which a drive gear 17 is attached, a reduction gear 19, and an opening/closing shaft 20.21 are attached to the opening mechanism holder 16. An opening/closing gear 22.23 is fixed to the end of the opening/closing shaft 20.21. Here, the above configuration will be referred to as an opening/closing mechanism.

Next, the opening/closing shaft 20.21 includes a holder half 7a,
The upper part of 7b is fitted and fixed. Bushes 24, 25 are attached to the end faces of the holder halves 7a, 7b. A plurality of guide rollers 26 are attached to the bushes 24 and 25, and cutouts 24a and 25a that form the insertion hole 9 for the coil holder 7 are provided.

FIG. 1(a) shows the normal state of the overhead wire flaw detection device moving on the overhead wire 1. As shown in FIG.

In the figure, since the opening/closing mechanism is not operating, the holder halves 7a and 7b are closed to form the insertion hole 9. At this time, the overhead wire 1 contacts the guide roller 24, and therefore does not directly contact the inner periphery of the coil holder 7.

FIG. 1(b) shows a state in which the overhead wire flaw detection device passes over the damper 14 installed on the overhead wire 1.

In the figure, the sensor 8 explained in FIG.
When detected, the motor 18 starts rotating. As a result, the opening/closing gear 2
2. Rotational force is transmitted to 23. Therefore, the opening/closing shaft 20.21 rotates, and with this rotation, the holder halves 7a, 7b are opened, and after opening to a predetermined position, the rotation of the motor 18 is stopped.

After a predetermined period of time has elapsed, that is, after passing over the damper 14, the motor 18 rotates in the opposite direction, and when the rotational force of the motor 18 is transmitted in the same manner as explained in FIG. 1(a), the holder half 7a
, 7b close and return to the state shown in FIG. 1(a). At this time,
The cutouts 24a and 24b of the bushes 24 and 25 allow the overhead wire 1 to be smoothly positioned at the center of the coil holder 7.

Now, a more detailed embodiment of the flaw detection device for overhead electric wires of the present invention will be described.

FIGS. 2(a) and 2(b) show a front view and a side view of the main parts of the flaw detection device for overhead wires according to the present invention.

In this device, a support rod 15 is held by a holding member (not shown), and an opening mechanism holder 16 is fixed via a support plate 15a at the end of the support rod 15. The opening mechanism holding portion 16 includes a motor 18 to which a driving gear 17 is attached.
, a reduction gear 19, opening/closing shafts 20 and 21, and a limit switch 27 are attached. An opening/closing gear 22.23 is fixed to the end of the opening/closing shaft 20.21.

Further, opening/closing plates 28.29 are fitted and fixed to the opening/closing shafts 2o, 21, and holder halves 7a, 7b of the coil holder 7 are attached to the opening/closing plates 28.29. Bushes 24.2 are provided on the end faces of the holder halves 7a and 7b.
A plurality of guide rollers 26 are attached to the bushes 24 and 25, and notches 24a and 25a forming the insertion hole 9 are provided. The opening end surfaces of the notches 24a and 25a widen in a tapered shape.

FIG. 3 shows a vertical sectional view of the main part of the coil holder 7.

The holder halves 7a and 7b of the coil holder 7 have 60
The holder halves 7a and 7b are held in a state where their positions are shifted by degrees.
Six square coil holes 30 are provided radially from the outer periphery toward the overhead electric wire 1. In this coil hole 30,
A support member 32 and a roller 31 pivotally supported by this support member 32
A coil frame 33 is fitted into the coil frame 33, and a detection coil 34 is fitted into the through hole of the coil frame 33. The detection coil 34 and the holding plate 35 have recesses 34a and 3 on their end faces.
5a is provided. The coil hole 30 is closed by a holding plate 35, and a spring 36 is disposed between the detection coil 34 and the holding plate 35 and held in recesses 34a and 35a.

Therefore, the elastic force of the spring 36 acts on the roller 31 via the coil frame 33 and the support member 32, and the roller 31 is always
is pressed against the outer periphery of the Furthermore, the elastic force of the spring 36 acts on the detection coil 34, and it is constantly pressed toward the outer circumference of the overhead wire 1. However, since the roller 31 comes into contact with the outer circumference of the overhead wire 1 before the detection coil 34, the detection coil 34 is set at a predetermined interval (0.5 to 1
mm) is maintained.

With the above configuration, when the damper 14 is detected on the overhead electric wire 1, the motor 18 starts rotating, and the opening/closing gears 22 and 23 rotate via the drive gear 17 and the reduction gear 19. This causes shaft 20.21 to rotate and shaft 2o
, 21 are driven, and the holder halves 7a and 7b of the coil holder 7 are opened and closed. When the limit switch 27 is turned on, the motor 18 is stopped and the coil holder 7 is opened. is retained. Next, when it passes over the damper 14, the motor 18 rotates in the opposite direction, closing the holder halves 7a and 7b of the coil holder 7. At this time, the bushings 24 and 25 have notches 24
．． 25a, the overhead electric wire 1 can be easily guided to the center of the insertion hole 9.

(Effects of the Invention) The overhead wire flaw detection device of the present invention having the above structure is constructed by a motor and a gear as an opening/closing mechanism, so the structure is simplified and manufacturing and handling are facilitated. Further, since the guide mechanisms are arranged on both end faces of the coil holder, there is no sliding movement between the overhead wire and the coil holder insertion hole, and wear of the coil holder can be prevented.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are side views of the main parts of the flaw detection apparatus for overhead electric wires according to the present invention, and FIGS. 2(a) and (b) are front views of the main parts of the flaw detection apparatus for overhead electric wires according to the present invention. Figure and side view, Figure 3 is a vertical sectional view of the main part of the coil holder according to the present invention, Figure 4 (a
) and (b) are a front view and a side view of a main part of a conventional flaw detection apparatus for overhead electric wires, and FIG. 5 is a side view of a main part of a conventional flaw detection apparatus for overhead electric wires. 7--------- Coil holder, 9------
----One insertion hole, 17---------Drive gear, 18---------Motor, 2o, 21--Shaft, 22.23---- 1--opening/closing gear, 24.25--buttons, 24a, 25b--1 notch, 26--guiding roller, 27--------- -Limit switch, 28.29
-11-- Opening/closing plate, 30-- Coil hole, 31-- Roller, 32-- Support material, 33-- -1----Coil frame, 34-1--Detection coil, 35--1--Press plate, 36--------Spring. (1 other person) 9-------1 insertion hole 17--1--Moving gear +8---1-motor 19--1--Reduction gear 20.21 -1 --- Shaft 22.23 --- One opening/closing gear 26 --- Guide roller 24.25 --- Bushings 24a, 25a -- One notch part multi-capacity 5 (b)

Claims (1)

[Claims] A running roller that engages on an overhead electric wire, a coil holder that has an insertion hole through which the overhead electric wire is passed and moves along the overhead electric wire as the running roller rolls, and an inside of the coil holder. and a detection coil disposed opposite to the outer periphery of the overhead wire,
A bush is disposed on both end faces of the coil holder to form the insertion hole with a diameter corresponding to the outer diameter of the overhead electric wire, and the coil holder is divided into two by a plane including the overhead electric wire together with the bush. The coil holder is equipped with an opening/closing mechanism that opens and closes the coil holder so that the large diameter portion of the overhead wire passes through, and the bush is provided with a rotating mechanism that circumscribes the outer periphery of the overhead wire. 1. A flaw detection device for an overhead electric wire, comprising a plurality of guide rollers arranged radially so as to move and hold the overhead electric wire at the center of the insertion hole.