JPH05172788A - Vibration detector for steel tower fixed equipment - Google Patents

Abstract

PURPOSE:To improve the measurement accuracy of fixed equipment vibration and work efficiency by monitoring with a ITV camera and applying laser beam and beam for confirmation to the fixed equipment in proper positions without lowering the intensity of each of the laser beams for vibration detection and one for reflection confirmation. CONSTITUTION:A mirror 36 reflecting the laser light 53 for reflection confirmation generated from a laser generator 31 is arranged on a position displaced from the light axis of the laser generator 12 generating a laser beam 51 for vibration detection. By preventing the lowering of the intensity of the laser beams 51, 52 for vibration detection and the laser beam 53 for reflection confirmation, the vibration measurement accuracy and work efficiency are improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel tower mounting device capable of reliably, swiftly and safely detecting a defective part such as a crack in a steel tower mounting device such as a suspension insulator for supporting a steel tower. The present invention relates to a vibration measuring device.

[0002]

2. Description of the Related Art The inventor of the present application has proposed a vibration measuring device for an insulator device supporting an overhead power transmission line, as disclosed in Japanese Patent Laid-Open No. 35351/1990. This measuring device irradiates the surface of the suspension insulator constituting the insulator device with a laser beam to mechanically vibrate the suspension insulator, and a laser beam generator for oscillator vibration, and a laser beam for detecting vibration on the surface of the suspension insulator. A laser beam generator for detecting vibration, a light receiver for receiving the reflected laser beam (object reflected light) emitted from the laser beam generator and reflected from the suspension insulator, and the reflected laser beam as the original laser beam. The vibration detecting device is configured to interfere with each other to detect the vibration of the suspension insulator from the interference light, and a voice converting device for converting the detection signal output from the vibration detecting device into audible voice. Then, the quality of the suspended insulator is determined by the state of the audible sound.

[0003]

The back surface of the suspension insulator is usually formed concentrically with the folds on the back surface of the cap portion, because the creeping insulation distance is usually long. Since the irradiation light on the measurement object is spot-like, the probability that the reflected light from the insulator returns is low,
Even when monitored with an ITV camera, the position where the reflected light returns was unknown, and vibration could not be detected in a practical time.

An object of the present invention is to provide a vibration measuring apparatus for a tower mounting device, which can adjust the irradiation position of the laser beam for detecting vibration to the mounting device quickly and reliably.

[0005]

In order to achieve the above object, according to the present invention, a vibration detecting laser beam is generated by irradiating a vibration detecting laser beam toward the surface of a tower-mounted device through an objective lens in a storage case. And a reflection confirmation light generator for confirming the reflection position from the attached device, and vibration detection of reflection confirmation light near the optical axis between the vibration detection laser light generator and the objective lens. A means for reflecting the vibration laser light in the same direction as that of the laser light is provided so that the vibration detection laser light and the reflection confirmation light can be irradiated substantially coaxially.

According to a second aspect of the invention, in the vibration detecting device according to the first aspect, the objective lens and the first intermediate lens are
A collimator type lens arrangement that can expand and irradiate the vibration measuring laser light is used. The second intermediate lens and the objective lens, which have a shorter focal length than the first intermediate lens, are used. With a collimator type lens arrangement that can be made larger than that, a mirror that reflects the reflection confirmation light in the same direction as the vibration detection laser light is used to detect vibration near the common focus of the objective lens and the first intermediate lens and the second intermediate lens. It is arranged at a position slightly displaced from the optical axis of the laser light.

[0007]

According to the present invention, the vibration detecting laser light output from the vibration detecting laser light generator is applied to the surface of the mounting device through the objective lens without being influenced by the mirror. Further, the reflection confirmation light output from the reflection confirmation light generator is reflected by the mirror in the same direction as the optical axis direction of the vibration detection laser light, and is irradiated onto the surface of the mounting device through the objective lens.
Therefore, the vibration confirmation laser light is not attenuated by the mirror, and the reflection confirmation light is also reflected by the reflection mirror substantially on the optical axis of the detection laser light. Since it is not necessary to increase the power of the laser light for reflection and the confirmation light for reflection, use a half mirror, etc.
It can be made more compact than when two lights are coaxial. When the reflected light of the insulator is captured by the ITV camera, the reflection point of the equipment for mounting the steel tower becomes stronger in the reflection of the reflection confirmation light.
Further, since the vibration detection laser light has a high light intensity, the irradiation position is bright even at a strong reflection point. By adjusting the reflection positions of the two lights at these two points to coincide with each other, the irradiation position can be adjusted quickly and reliably.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the suspension armature 3 supporting the power transmission line 4 is suspended from the support arm of the steel tower 1. This suspension insulator string 3 is configured by connecting a large number of suspension insulators 2 shown in FIG. 3 in series. This suspension insulator 2 is composed of an insulator body 5, a cap metal fitting 6 which is cement-fitted on the upper portion thereof, and a pin metal fitting 7 which is cemented on the lower portion thereof.

On the other hand, a suspension insulator 5 is provided at a stable place on the ground.
A speaker 8 for mechanically giving vibration to the
A sound pressure is applied to the insulator 5 through a space so that the suspension insulator 5 vibrates.

Further, as shown in FIG. 1, a laser Doppler vibration measuring device 10 for detecting the vibration of the insulator 2 by utilizing the interference of laser light is provided in a storage case 9 installed at a stable position on the ground. is set up. A reflection confirmation light generator 11 is housed in the housing case 9.

Therefore, the laser Doppler vibration measuring device 1
0 will be described in the storage case 9 as shown in FIG.
The He-Ne laser light generator 12 is arranged as shown in FIG. From this laser light generator 12, (λ = 0.64
The vibration detecting laser light 51 of μm, output to several mW) is output. In front of the laser light generator 12, a first polarization beam splitter 13 for splitting the vibration detecting laser light 51 into two, and an irradiation laser light 51.
And a second polarization beam splitter 14 for directing the reflected laser light from the suspension insulator in a perpendicular direction.

A first intermediate lens 15 having a focal length of, for example, about 50 mm is arranged between the beam splitters 13 and 14, and the beam diameter of the laser beam 51 is expanded by a collimator type lens arrangement with the objective lens 18. Then, the object, that is, the suspension insulator 2, is irradiated. Further, a first mirror 16 for reflecting the laser light 51 backward is arranged in front of the second beam splitter 14, and the laser light 51 reflected from the first mirror 16 is arranged at the center of the upper part of the storage case 9. A second mirror 17 for reflecting forward is installed. Further, an objective lens 18 is installed above the front end of the storage case 9. Both mirrors 1
A λ / 4 plate 19 is arranged between 6 and 17.

The objective lens 18 has a large diameter (100 to 150 mmφ) in order to measure the vibration of the irradiating beam 2 and the vibration of the suspension insulator 2 at a long distance, and has a long focal length for low aberration. used. The beam diameter of the irradiation laser light 51 is parallel light of about 10 mmφ.

The first polarization beam splitter 13, the first
The laser light 51 straightly traveling from the intermediate lens 15 and the second polarization beam splitter 14 is reflected by the first mirror 16, then passes through the λ / 4 plate 19, is reflected by the second mirror 17, and passes through the objective lens 18. , The insulator main body 5 of the suspension insulator 2 is irradiated, and then enters the objective lens 18 again as the object-reflected laser light 52, and passes through the same path as the irradiation path up to the second polarization beam splitter 14, and the second polarization beam splitter 1
The pinhole plate 25, which will be described later, is reflected by 4
Is incident on.

In addition, the original beam (reference beam) 54 branched by the first beam splitter 13 has a constant frequency (8).
Acousto-optic device (AO) for lowering 0 MHz
M) 20 is connected, and the acousto-optic element 20 is provided with a drive circuit 21 thereof.

A pinhole plate 25 having a small hole 25a between the second beam splitter 14 and the third beam splitter 23, and a third intermediate lens 27 supported by an electric slide stage 26 in a positionally adjustable manner. And the object reflected laser light 52 reflected by the second beam splitter 14 is guided to the third intermediate lens 27 through the small hole 25a of the pinhole plate 25, and the lens 2
7, the beam diameter of the reflected laser light 52 is adjusted to be almost the same as the beam diameter of the reference laser light. Then, the original laser beam 54 is reflected by the third mirror 22 via the acousto-optic device 20, and then is incident on the third beam splitter 23, where the object-reflected laser beam 52 from the insulator and the reference beam 54. Are being interfered with.

Further, the interference light emitted from the third beam splitter 23 is avalanche photodiode (AP).
D) converted into an electric signal by 24. Further, the avalanche photodiode 24 is connected to a demodulator 28 for converting into an output signal proportional to the frequency (speed) of the suspension insulator, and the demodulator 28 analyzes the frequency and level of the suspension insulator. A frequency analysis device (FFT analyzer) 29 for performing the operation is connected.

Next, referring to FIG. 1, a laser beam 53 for confirmation of reflection is shown.
A laser light irradiation device 11 for reflection confirmation for irradiating the suspension insulator 2 will be described. A He-Ne laser light generator 31 for generating a reflection confirmation laser light 53 is disposed in the rear portion of the housing case 9 in parallel with the laser light generator 12 and toward the rear. This laser light generator 3
The laser light 53 output from the laser beam No. 1 is sequentially reflected and reflected by the fourth mirror 32, the fifth mirror 33, and the sixth mirror 34, which are arranged at predetermined positions in the storage case 9, and the optical axis direction of the vibration detection laser light 51. Irradiation is made in a direction orthogonal to. The confirmation laser light 53 reflected by the sixth mirror 34 has its beam diameter expanded by the second intermediate lens 35 for expanding the beam diameter, and then the seventh mirror 36.
Is reflected in the same direction as the optical axis direction of the detection laser beam 51. Further, the seventh mirror 36 is arranged near the common focus of the objective lens 18, the first intermediate lens 15 and the second intermediate lens 35 at a position slightly displaced from the optical axis of the vibration detecting laser beam 51, and detects the vibration. The laser light 51 for use is not blocked or the light intensity is not attenuated. Also, the seventh
The confirmation laser light 53 reflected from the mirror 36 is
The beam splitter 14 is incident on and reflected by the first mirror 16, and the objective laser 18 irradiates the suspension insulator 2 so that the detection laser light 51 passes through the beam diameter of the confirmation laser light 53. In this embodiment, the second
The focal length of the intermediate lens 35 is 20 mm.

After the confirmation laser light 53 is reflected from the suspension insulator 2, the reflection state is displayed by the monitor television 30 through the ITV camera 39 installed in the immediate vicinity.
Therefore, when the irradiation state of the reflection confirmation laser light 53 on the insulator body 5 as shown in FIG. 5 is confirmed and the strong reflection point E which is most strongly reflected among them is confirmed, the laser Doppler By operating the mirror drive device 37 that changes the irradiation direction of the vibration measuring device 10 to adjust the direction of the eighth mirror 38 and operate the position of the laser light 51 so as to match the strong reflection point E, the laser light It is possible to irradiate 51 with an appropriate irradiation position on the surface of the insulator body 5. Even when the strong reflection point E is unclear or does not appear on the insulator main body 5, the strong reflection point E is adjusted by operating the mirror driving device 37 to adjust the arrangement position of the eighth mirror 38. To appear on the surface of.

Next, when the vibration detecting laser beam 51 is irradiated from the He-Ne laser generator 12 so as to be directed to the strong reflection point E, the reflected laser beam 52 is surely returned to the laser Doppler vibration measuring device 10. However, vibration measurement work can be performed quickly. In this state, the suspension insulator 2 is vibrated by the speaker 8. Then, the frequency detected by the insulator body 5 is measured, and the demodulator 28 and the frequency analysis device 29 analyze whether or not the insulator is a defective insulator.

In the vibration measuring apparatus according to the embodiment of the present invention, the vibration detecting laser light 51 emitted from the laser Doppler vibration measuring apparatus 10 and the reflection confirming laser light 53 are coaxially irradiated in the housing case 9. A seventh embodiment in which the reflection confirmation laser light generator 11 for irradiation is built in, and the confirmation laser light 53 is placed on the optical axes of the detection laser light 51, 52.
Since the arrangement position of the mirror 36 is slightly displaced from the optical axis of the laser light 51, it is possible to prevent the intensity of the laser light 51 from being lowered, and at the same time, it is possible to prevent the reflection confirmation laser light 53.
Can be placed on the almost same optical axis as the laser beam 51 with almost no attenuation by the mirror 36, so that the intensity of the laser beam 53 does not decrease. Therefore, the laser generator 1
Without increasing the output of 2, 31, both laser light 51,
It is possible to reliably irradiate the suspension insulator 2 with 53 with proper intensity, to easily confirm the strong reflection point E, and to irradiate the strong reflection point with the vibration detection laser light 51 reliably and quickly. , The efficiency of detection work can be improved.

The present invention is not limited to the above-described embodiment, but the vibration of an object other than the insulator can be detected, and the reflection confirmation laser light 53 reflected from the suspension insulator 2 can be stored in the case. Light is received by a light receiving unit (not shown) in 9 and its reflection state is confirmed,
The configuration of each part can be arbitrarily changed and embodied, for example, by using visible light instead of the reflection confirmation laser light 53, without departing from the spirit of the present invention.

[0023]

As described in detail above, according to the present invention, the arrangement position of the reflection mirror for placing the reflection confirmation light on the optical axis of the vibration detecting laser light is set at a predetermined distance from the optical axis of the laser light. Since they are arranged so as to be displaced, the laser light and the confirmation light are mounted at appropriate positions by monitoring the object with, for example, an ITV camera without lowering the respective intensities of the vibration detection laser light and the reflection confirmation light. It becomes possible to improve the accuracy of vibration measurement and the work efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vibration detecting device for a tower mounting device of the present invention.

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

FIG. 3 is a partial front view of a suspension insulator string.

FIG. 4 is a schematic perspective view of a vibration measuring device.

FIG. 5 is a back view of the insulator body showing the irradiation state of the laser light and the reflection confirmation light.

[Explanation of symbols]

5 Insulator body, 9 Storage case, 10 Laser Doppler vibration measuring device, 11 Laser light generating device for confirmation of reflection, 1
2 He-Ne laser generator, 15 1st intermediate lens,
18 objective lens, 31 He-Ne laser generator for confirmation of reflection, 35 second intermediate lens, 36 seventh mirror, 5
1,52 Vibration detection laser light, 53 Reflection confirmation laser light.

Claims (2)

[Claims] 1. A vibration detecting laser beam generator for irradiating a vibration detecting laser beam toward the surface of a steel tower mounting device through an objective lens is provided in a storage case, and a reflection position from the mounting device is confirmed. A reflection confirmation light generator is provided, and a mirror for reflecting the reflection confirmation light in the same direction as the vibration detection laser light is provided near the optical axis between the vibration detection laser light generator and the objective lens. Vibration detection device for steel tower mounting equipment that can irradiate laser light and reflection confirmation light almost coaxially. 2. The vibration detection device according to claim 1, wherein the objective lens (18) and the first intermediate lens (15) are arranged in a collimator type lens capable of enlarging and irradiating the vibration measuring laser light (51). , A second intermediate lens (35) having a shorter focal length than the first intermediate lens (15) and the objective lens (1
8) is a collimator type lens arrangement capable of making the beam diameter of the reflection confirmation light (53) larger than that of the vibration measurement laser light (51), and the reflection confirmation light (53) is the vibration detection laser light (51). Mirror that reflects in the same direction as (36)
Is arranged at a position slightly displaced from the optical axis of the vibration detection laser light (51) in the vicinity of the common focus of the objective lens (18), the first intermediate lens (15) and the second intermediate lens (35). Vibration detection device for equipment installed in steel towers.