JPH04303760A - Device for measuring vibration of attachment of steel tower - Google Patents

Abstract

PURPOSE:To quickly set the device in a state capable of measurement without any change of the set position of a laser beam generation device for vibration detection and its beam receiver by relaying the laser beam for the vibration detection on route. CONSTITUTION:When visible radiation S is emitted on a reflection mirror of a reflector 30 from a laser Doppler vibration measurement device 11, it is reflected to reach up to a suspended insulator body 6. Here, the reflected radiation S irradiates to reflect on the mirror 34 and returns to the device 11. This is confirmed by the use of a CCD camera 29 and a monitor television set TV. In the case where a strong reflection point on the body 6 is unclear and the like, a joy stick circuit is handled to adjust the inclined angle and the horizontal position of the mirror 34 and the reflection point is introduced to the proper position of the body surface. Next, when a laser beam for the vibration measurement from the device 11 is irradiated on the reflection point, the reflected laser beam surely returns to the device 11. In this state a suspended insulator 5 is vibrated by the use of a pulse laser beam generator to perform the measurement without any modification of the position of each device of emission and receiving.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is capable of reliably and quickly detecting vibrations of tower-mounted equipment when defects such as cracks occur in tower-mounted equipment such as suspension insulators that support the tower. This relates to a measuring device.

0002

2. Description of the Related Art The present inventor has proposed a vibration measuring device for a support insulator supporting an overhead power transmission line, as disclosed in Japanese Patent Application Laid-Open No. 2-35351. This measuring device consists of a laser beam generator for insulator vibration that irradiates the surface of the insulator with a laser beam to mechanically vibrate the insulator, and a vibration detection laser beam that irradiates the surface of the insulator with a laser beam for vibration detection. The laser beam irradiated from the vibration detection laser beam generator and the vibration detection laser beam generator is reflected from the same insulator, the reflected laser beam (object reflected light) is caused to interfere with the original laser beam, and the vibration of the insulator is detected from the interference light. The vibration detecting device includes a vibration detecting device, and an audio converting device for converting the detection signal output from the vibration detecting device into audible sound.

0003

[Problem to be Solved by the Invention] Normally, folds are formed concentrically on the back surface of the support insulator in order to increase the creepage insulation distance, and when the lower surface of the folds is irradiated with a laser beam, it is difficult to adjust the angle of incidence and reflection properly. Therefore, in the conventional vibration measuring device for tower support insulators, it is troublesome to move and adjust the installation locations of the vibration detection laser light generator and light receiver to appropriate positions, which reduces measurement work efficiency. The problem was that it could not be improved.

[0004] The first object of the present invention is to detect vibrations without changing the installation location of a laser beam generator and a light receiver.
An object of the present invention is to provide a vibration measuring device for tower-mounted equipment that can quickly set the device to a measurable state. or,
A second object of the present invention, in addition to the first object, is to provide a vibration measuring device for tower-mounted equipment that can maintain measurement accuracy even if the mounted equipment oscillates within a predetermined range. There is a particular thing.

Furthermore, a third object of the present invention is to
In addition to the second object, it is an object of the present invention to provide a vibration measuring device for tower-mounted equipment that can further improve measurement efficiency.

[0006]

[Means for Solving the Problems] In order to achieve the first object, the invention according to claim 1 includes an attached device vibrating means for mechanically vibrating the attached device, and a laser for vibration detection on the surface of the attached device. a vibration detection laser light generation device that irradiates light; a light receiving means that reflects the laser light irradiated from the vibration detection laser light generation device to the attached device from the attached device and receives the reflected laser light; A vibration detection device that detects the vibration of the attached device using the reflected laser light received by the light receiving means, and a quality determination device that compares the output signal from the vibration detection device with the vibration of a normal attached device to determine whether or not the attached device is defective. In the vibration measuring device for tower-mounted equipment, the vibration measuring device includes a discrimination means, in which a laser beam reflection device having an angle adjustment mechanism for relaying the laser beam is disposed in the middle of the path of the vibration detection laser beam.

In order to achieve the second object, the invention as claimed in claim 2, in the configuration as claimed in claim 1, is arranged such that the laser beam reflecting device is located above the attached equipment. Furthermore, in order to achieve the third object, in the structure of claim 1 or 2, the invention as set forth in claim 3 is arranged such that visible light irradiation means is disposed near the vibration detection laser light generating device, and the light receiving means The photographing means is placed near the.

[0008]

According to the first aspect of the invention, when the surface of the attached device is irradiated with a laser beam from the laser beam generator for vibration of the attached device, the attached device is mechanically vibrated. In this state, when a laser beam is irradiated from the vibration detection laser beam generator to the reflection device and the laser beam reflected from here is irradiated onto the surface of the attached device, this laser beam is reflected from the attached device, and this laser beam is reflected again. A laser beam is irradiated onto the reflecting device, and the reflected laser beam is received by a light receiver. The received reflected laser light is then input to a vibration detection device to detect vibrations of the attached equipment. Further, the output signal from the vibration detection device is compared with vibration data of a normally installed device by a determining means to determine whether or not the device is a defective installed device.

Since the laser beam reflection device is equipped with an inclination angle adjustment mechanism, it is possible to adjust the laser beam to an appropriate irradiation angle and an appropriate reflection angle. The path of the laser beam can be quickly adjusted without adjusting the position of the laser beam generator and the light receiver. In addition, in the invention according to claim 2, since the reflecting device is located above the tower-mounted equipment, if the mounted equipment is a suspension insulator or the like, where the insulator surface is close to the comparison plane,
Since the flat insulator surface can be irradiated with laser light, even if the suspended insulator swings due to wind, etc., as long as it is within the specified range, the reflected laser light will reliably reach the receiver through the appropriate optical path. Therefore, measurement accuracy can be improved.

Furthermore, in the invention according to claim 3, when visible light is irradiated from the visible light irradiation means, the surface of the attached equipment is irradiated with the visible light, and this visible light is reflected again from the reflection device and is reflected near the light receiver. The photograph is taken by a photographing means placed at. Therefore, the reflection path of the light from the attached equipment and the part where the light is most strongly reflected can be confirmed, so the optical path can be quickly searched, and the vibration detection laser beam can be irradiated to the point of strong light reflection. It is possible to improve measurement accuracy.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 10. As shown in FIG. 2, a suspension insulator chain 4 that supports a power transmission line 3 is suspended from a support arm 2 of a steel tower 1. This suspension insulator chain 4 is constructed by connecting a large number of suspension insulators 5 shown in FIG. 1 in series. This suspension insulator 5 is composed of an insulator body 6, a cap metal fitting 7 fitted with cement on the upper part thereof, and a pin metal fitting 8 bonded with cement on the lower part.

On the other hand, a pulsed laser beam generator 10 as an insulator vibrating means for applying a mechanical shock to the suspended insulator 5 is installed at a stable location on the ground G, and a pulse laser beam generator 10 is installed on the porcelain surface 6a of the insulator body 6. By irradiating the suspended insulator 5 with , the suspended insulator 5 can be vibrated. In this embodiment, the pulsed laser light generator 10 outputs a TEA-CO2 laser (λ=10.6 μm, output ~ several J). T irradiated from the laser beam generator 10
When the surface of the insulator is irradiated with the EA-CO2 laser beam, the irradiated surface is heated in a pulsed manner to generate a shock wave, and this effect causes the insulator to vibrate.

Further, in a stable location on the ground G, a laser Doppler vibration measuring device 11 is installed which serves as both a vibration detection laser beam generator and a light receiving means in order to detect the vibration of the insulator 5 by using laser beam interference. is installed. As shown in FIG. 4, a He--Ne laser light generator 12 is installed within this vibration measuring device 11. This laser beam generator 1
2 outputs laser light of (λ=0.64 μm, output ~ several mW). In front of the laser beam generator 12, first and second beam splitters 13 and 14 are arranged to split the laser beam emitted from the generator 12 into two. The laser light that has gone straight from the beam splitters 13 and 14 passes through the lens 15, enters a laser light reflection device 30 (described later), is reflected, and is irradiated onto the suspension insulator 5, and then returns to the laser light reflection device 30 as object reflected light. The light enters and is reflected, enters the lens 15, is reflected from the second beam splitter 14, enters the mirror 16, and is input to the third beam splitter 17. Further, an acousto-optic device (AOM) 18 for applying a constant frequency (80 MHz) is connected to the first beam splitter 13, and a drive circuit 19 is provided to the acousto-optic device (AOM) 18. Further, the original laser light (reference light) branched from the first beam splitter 13 is supplied to the third beam splitter 17 via the acousto-optic element 18, where it is separated from the object reflected light from the insulator due to the optical path difference. It is starting to be interfered with. Furthermore, the laser beam emitted from the third beam splitter 17 is an avalanche photodiode (APD).
20 into an electrical signal.

Further, a demodulator 21 is connected to the APD 20 for detecting the vibration frequency and vibration speed of the insulator 5 by FM modulating the electric signal converted from the optical signal through a signal line, and furthermore, the demodulator 21 detects the vibration frequency and vibration speed of the insulator 5. The device 21 is equipped with a frequency analyzer (FF) for analyzing vibration frequency and velocity.
T analyzer) 22 is connected. As shown in FIG. 3, a visible light irradiation device 23 for irradiating the insulator with visible light is built into the case housing the laser Doppler vibration measurement device 11. To explain this device, a visible light generator 23A is placed near the vibration measuring device 11, and the visible light output from the generator 23A passes through a concave lens 25 supported by a movable support 24, and then First to third mirrors 26A, 26B, 26C
The laser beam enters and is reflected, is guided to the perforated mirror 27, and is irradiated to the outside through the same path as the vibration detection laser beam. This visible light enters a convex lens 28B supported by a movable support 24B, and is irradiated onto the suspended insulator 5 from here. This visible light ray S is circularly irradiated onto the upper surface of the insulator body 6 as shown in FIG. Further, a convex lens 2 is provided between the vibration measuring device 11 and the perforated mirror 27.
8A is placed. Then, the reflected laser beam for vibration detection that is reflected from the insulator and passed through the window hole 27a of the perforated mirror 27 from the convex lens 28B is guided into the vibration measuring device 11 by the convex lens 28A.

On the other hand, the laser Doppler vibration measuring device 1
1, a CCD camera 29 is arranged as a means for photographing the reflected visible light S irradiated onto the suspended insulator 5 from the visible light irradiation device 23, and the camera 29 detects the reflection point P with the strongest reflection intensity as shown in FIG. is photographed, and this state can be seen on a monitor television MT connected to the camera 29.

Next, FIG. 6 shows a laser beam reflecting device 30 attached to the support arm 2 of the steel tower, which is the main part of the present invention.
- Explanation will be centered on FIG. 10. A transport mechanism 32 is attached to a guide rail 31 attached to the support arm 2. A reflection mirror 34 is supported by the transport mechanism 32 via an angle adjustment mechanism 33.

The transport mechanism 32 includes a movable support frame 35 that moves in the horizontal direction along the guide rail 31, and a movable support frame 35 that is rotatably supported by the frame 35 by a support shaft 38, and that supports the horizontal rail of the guide rail 31. An upper roller 36 and a lower roller 37 that roll while sandwiching the portion 31a from above and below, a motor 39 that rotates a support shaft 38 of the upper roller 36, and a motor 39 that is interposed between the rotation shaft of the motor 39 and the support shaft 38. The gear train 40 is composed of a gear train 40 and a gear train 40.

A mounting cylinder 41 is connected to the lower surface of the movable support frame 35, and a rotary support cylinder 42 is rotatable in the horizontal direction around a vertical axis via a bearing 43 at the bottom of the mounting cylinder 41. A motor 44 and a speed reducer 46 for rotating the rotary support cylinder 42 are attached to the upper part of the mounting cylinder 41. An inverted U-shaped mirror mounting frame 47 is connected to the lower end surface of the rotary support cylinder 42, and the reflecting mirror 34 is supported by a support shaft 48 at the lower end thereof. A mirror inclination angle adjustment mechanism 49 for adjusting the vertical inclination angle of the reflecting mirror 34 around the horizontal axis is provided on the rotation support tube 42 and the mirror mounting frame 47. To explain this mechanism, the rotation support cylinder 42
A motor 50 is housed in the lower part of the motor 50 , and a drive pulley 52 is provided at the lower end of a rotating shaft 51 , and rotation is transmitted via a belt 53 to a driven pulley 54 fitted and fixed to a connecting shaft 55 . Further, a worm 56 and a worm wheel 57 are installed on the connecting shaft 55 and the support shaft 48, and when the motor 50 is driven, the inclination angle of the reflecting mirror 34 is adjusted.

Each of the motors 39, 44, 50 is provided with an angle detector 58, 59, 6 such as a rotary encoder.
0 is provided so that the inclination state of the reflection mirror 34 can be confirmed. Next, the laser beam reflection device 3
A control device for manually rotating each of the motors 39, 44, and 50 of No. 0 will be explained based on FIG. 10 on the ground side.

As shown in FIG. 2, a power supply cable 61 and an optical fiber cable 62 are attached to the steel tower 1, and a relay unit 63 connected to the lower ends of both cables is provided with a power supply terminal 64 and an optical connector 65. A control device 66 on the ground side is connected to the connector 65. Further, the control device 67 on the side of the laser beam reflection device 30 is connected to the control device 66 on the ground side by the optical fiber cable 62.

As shown in FIG. 10, the ground side control device 66
is provided with an E/O converter 78, an O/E converter 79, and an addition/subtraction circuit 70, and a manually operable joystick circuit 71 is connected to the addition/subtraction circuit 70. In addition, the control device 67 on the reflection device 30 side includes an O/E converter 72 and an E
A /O converter 73 and an amplifier 74 are provided so that the amount of rotation of the motor 39 can be controlled based on a detection signal from the angle detector 58. Said motor 4
4 and 50 are rotationally controlled by a device similar to the control device shown in FIG. And each motor 38,
The coordinates of the reflection mirror 34 of the reflection device 30 can be adjusted to a desired position by controlling the rotations of 44 and 50.

Next, the operation of the vibration measuring device for tower-mounted equipment constructed as described above will be explained. First, He
When the light from the -Ne laser generator 12 is kept blocked by the shutter and the visible light irradiation device 23 is operated to illuminate the reflection mirror 34 of the reflection device 30 attached to the support arm 2, visible light S is reflected. and reaches the suspension insulator 5. The visible light reflected here then returns to the reflection mirror 34.
laser Doppler vibration measuring device 11
returned to the side. This feedback visible light is captured by a CCD camera 29 placed near the laser Doppler vibration measuring device 11 and displayed on a monitor TV. Therefore, the state of irradiation of visible light onto the insulator main body 6 is determined, and the strong reflection point P that reflects the most strongly is confirmed. If the strong reflection point P is unclear or does not appear on the insulator main body 6, operate the joystick circuit 71 to adjust the inclination angle and horizontal position of the reflection mirror 34. appears at an appropriate position on the surface of the insulator body 6.

Next, with the shutter open, the laser Doppler vibration measuring device 11 is operated to irradiate a vibration measuring laser beam from the He-Ne laser generator 12 to the strong reflection point P. The reflected laser light is reliably returned to the laser Doppler vibration measuring device 11, and measurement work can be performed quickly. In this state, the suspension insulator 5 is vibrated by the pulse laser generator 10.

Now, in the vibration measuring device of the first embodiment, since the reflection device 30 is installed above the suspended insulator 5, it is possible to irradiate the vibration measuring laser beam onto the relatively flat upper surface of the insulator body 6. Therefore, even if the suspended insulator chain 4 sways somewhat due to wind pressure or the like, the reflected laser light can be returned to the laser Doppler vibration measuring device 11, and as a result, vibration measurement work can be performed with high accuracy.

Furthermore, since the reflection device 30 is attached, when adjusting the laser beam irradiation path and return path to appropriate paths, the direction of the laser Doppler vibration measuring device 11 is also adjusted at the same time. Therefore, since the optical path can be easily adjusted, the efficiency of measurement work can be improved. Next, the second aspect of this invention
An example will be described based on FIGS. 11 to 16.

As shown in FIG. 11, in this embodiment, a laser reflection device 30 is supported so as to be movable along a ground wire 9 installed at the upper end of the steel tower 1. To explain the configuration of this laser beam reflecting device 30, as shown in FIG.
4 is supported. The support shaft 84 of the lower wheel 82C is supported by an arm 85, and one end of this arm 85 is supported by a rotating shaft 87a of a motor 87 so as to press the wheel 82C against the ground wire. A belt 89 is hung between a pulley 88 provided on the shaft and a pulley 90 supported on the support shaft 84, and the wheel 82c is rotated by the rotation of the motor via the pulley 88, belt 89, and pulley 90. Therefore, the movable support frame 11
is movable on the ground wire 9. The arm 85 is biased by a compression spring 86 so as to press the wheel 82C toward the ground wire 9 side. The laser reflecting device 30 is attached to the lower part of the movable support frame 81. Further, a battery 91 is attached near the mounting cylinder 41. Power is supplied to this battery 91 by a circuit shown in FIG. A current transformer 92 is attached to the ground wire 9, and the alternating current output from the current transformer 92 is supplied to a rectifier 93. Further, a constant voltage power supply circuit 94 is connected to the rectifier 93, and this circuit is connected to the battery 91. And capacitor C
When the voltage applied across both ends reaches a constant value, the relay R is operated, its contacts Ra1 and Ra2 are closed, and the battery 91 is charged.

Next, a third embodiment of the present invention will be explained based on FIGS. 17 and 18. In this embodiment, the laser reflection device 30 is placed on the ground side, and the laser Doppler vibration measurement device 11 and CCD camera 29 are directed toward the reflection mirror 34 of this reflection device 30 to measure vibrations. In this embodiment, visible light is irradiated onto the back surface of the insulator body 6a as shown in FIG.
The brightest part (marked with *) is detected. Therefore, it is possible to determine whether the insulator body 6 is good or bad by irradiating it with a vibration measuring laser beam from the laser Doppler vibration measuring device 11.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the visible light irradiation device 23 may be provided independently from and near the vibration measuring device 11, or instead of the laser Doppler vibration measuring device 11, The present invention may be modified and embodied in any way without departing from the spirit of the invention, such as using a measuring device with a separate light receiver or using a searchlight as a visible light irradiation device. can.

[0029]

As described in detail above, in the invention according to claim 1, since the laser beam reflection device is provided with an inclination angle adjustment mechanism, the laser beam can be adjusted to the appropriate irradiation path and the appropriate reflection path. Can be large compared to reflector devices,
The path of the laser beam can be quickly adjusted without adjusting the position of the heavy vibration detection laser beam generator and light receiver.

[0030] Furthermore, in the invention as claimed in claim 2, since the reflecting device is located above the tower-mounted equipment, if the mounted equipment is a suspension insulator or the like where the insulator surface is close to the comparison plane, the flatness of the equipment is Since the laser beam can be irradiated onto the surface of the insulator, even if the suspended insulator swings due to wind, etc., as long as it is within the specified range, the reflected laser beam will reliably reach the receiver side through the appropriate optical path. Therefore, measurement accuracy can be improved.

Furthermore, according to the third aspect of the invention, since the reflection path of the light from the attached equipment and the part where the light is most strongly reflected can be confirmed, the light irradiation path and the reflection path can be quickly searched. , it is possible to irradiate a laser beam for vibration detection to a point where light is strongly reflected, and measurement accuracy can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged front view of the vicinity of a laser beam reflecting device embodying a first embodiment of the present invention.

FIG. 2 is a schematic front view showing the entire vibration measuring device.

FIG. 3 is a sectional view showing a laser Doppler vibration measurement device.

FIG. 4 is a detailed view of the main parts of the laser Doppler vibration measurement device.

FIG. 5 is an enlarged plan view of the insulator body.

FIG. 6 is a cross-sectional view of a laser beam reflection device.

FIG. 7 is a side view of the laser light reflection device.

FIG. 8 is a plan cross-sectional view of the conveyance mechanism of the laser beam reflection device.

9 is a sectional view taken along line AA in FIG. 6. FIG.

FIG. 10 is a circuit diagram of a control device.

FIG. 11 is a schematic front view showing a second embodiment of the invention.

FIG. 12 is a front view of a reflection device according to a second embodiment.

FIG. 13 is a longitudinal sectional view of a reflection device according to a second embodiment.

FIG. 14 is a plan cross-sectional view showing a drive mechanism of the reflection device.

15 is a sectional view taken along line BB in FIG. 14. FIG.

FIG. 16 is a power supply circuit diagram for the reflection device.

FIG. 17 is a schematic explanatory diagram showing a third embodiment of the present invention.

FIG. 18 is a back view of the insulator body.

[Explanation of symbols]

6 insulator body, 10 pulse laser light generator as attached equipment vibration means, 11 laser doppler vibration measuring device, 12 He-Ne laser light generator, 21 demodulator, 23 visible light irradiation device, 29 CCD as imaging means Camera, 30 Laser light reflection device, 31
Guide rail, 33 Angle adjustment mechanism, 34 Reflection mirror, 49 Mirror tilt angle adjustment mechanism, 66 Control device, 67 Control device, 71 Joystick circuit.

Claims (3)

[Claims] 1. An attached device vibrating means for mechanically vibrating an attached device, a vibration detection laser beam generator that irradiates a vibration detection laser beam onto the surface of the attached device, and the vibration detection laser beam generator. a light receiving means for reflecting a laser beam irradiated onto the mounted equipment from the mounted equipment and receiving the reflected laser light; and a vibration detection device for detecting vibrations of the mounted equipment using the reflected laser light received by the light receiving means. , a vibration measuring device for tower-mounted equipment, comprising: a quality determination means for comparing the output signal from the vibration detection device with the vibration of a normal installed equipment to determine whether or not the installed equipment is defective; 1. A vibration measuring device for tower-mounted equipment, characterized in that a laser beam reflecting device having an angle adjustment mechanism for relaying the laser beam is disposed in the middle of the path of the laser beam. 2. The vibration measuring device for tower-mounted equipment according to claim 1, wherein the laser beam reflection device is located above the mounted equipment. 3. The steel tower mounting according to claim 1, wherein a visible light irradiation means is disposed near the vibration detection laser beam generator, and a photographing means is disposed near the light receiving means. Equipment vibration measurement device.