JPH1054827A - Probe fixing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a probe fixing tool, which is used for a deterioration diagnosing device for cable covering material that can securely perform the deterioration diagnosis of a cable. SOLUTION: This probe fixing tool is used for a deterioration diagnosing device for a cable covering material and fixes a probe for performing the trnasmission and reception of ultrasonic waves. The probe fixing tool comprises a probe 2, a cable supporting body 3 for supporting a cable under test located at the lower side of the probe 2 through the cable under test 1 and a linking body 4, which links the probe 2 and the cable supporting body 3 so as to surround the half of the outer surface of the cable under test 1. In the above described fixing tool, the center of the cable 1 is located at the upper side of the supporting body 3 when the cable 1 is arranged on the cable supporting body 3. Therefore, the probe 2 is fixed to the outer surface of the cable 1 at the angle directed to the center of the cable 1. In the device having the above described fixing tool, the deterioration diagnosis of the cable can be performed securely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe fixing device for fixing a probe used in an apparatus for diagnosing deterioration of a cable covering material.

[0002]

2. Description of the Related Art In many cases, a covering material of a cable is made of an organic material having excellent electric insulation, and the covering material deteriorates with time due to various factors. Such aging is greatly affected by the environmental atmosphere in which the cable is laid. For example, in a cable laid in a facility related to a nuclear power plant, heat and radiation often cause deterioration. Since there is a problem that the electrical insulation deteriorates as the deterioration progresses, it is important to diagnose the deterioration especially for the cable laid under the special environment as described above.

Conventionally, as a method of diagnosing deterioration of a cable coating material in a laid state, Japanese Patent Laid-Open No. 7-35733 discloses a method of measuring the degree of deterioration by measuring the ultrasonic wave propagation velocity of the cable coating material. The measurement of the ultrasonic wave propagation velocity of the cable covering material is specifically as follows. First, a probe for transmitting and receiving ultrasonic waves (hereinafter also referred to as a probe) and an apparatus capable of measuring the time from transmission to reception of ultrasonic waves by the probe are prepared. Next, as shown in FIG. 1, the probe 2 is fixed to an appropriate position on the outer peripheral surface of the covering material 12 of the cable 1 in a laid state,
The ultrasonic wave is transmitted from the ultrasonic transmitter 21 of the probe 2 to the cable 1.
The ultrasonic wave transmitted through the conductor 11 and propagated in the coating material and reflected on the inner surface of the coating material is received by the receiver 22. Then, the time from when the ultrasonic wave is transmitted from the transmitter to when the ultrasonic wave is received by the receiver is measured, and the ultrasonic wave propagation velocity in the coating material is obtained from this time and the thickness of the coating material.

However, when the above measurement is performed, for example, as shown in FIG. 2, when the fixed angle at which the probe 2 is fixed to the outer peripheral surface of the covering material 12 of the cable 1 in a laid state is inappropriate. Is an ultrasonic wave transmitted from the ultrasonic transmitter 21 of the probe 2 toward the conductor 11 of the cable 1,
The reflection angle at the time of reflection on the inner surface of the coating material becomes large, and in such a case, the ultrasonic wave cannot be received by the ultrasonic receiver 22 of the probe 2, so that it is impossible to measure the ultrasonic wave propagation velocity. There was a problem.

The present invention has been made in order to solve the above-mentioned problems, and provides a probe fixing tool for stabilizing a fixing angle of a probe to a test cable to be subjected to ultrasonic deterioration diagnosis. Things.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a probe for transmitting and receiving ultrasonic waves, and an ultrasonic wave of a coating material based on a time from transmission to reception of the ultrasonic waves and a coating material thickness of a cable under test. A calculation unit for calculating the propagation speed, and a judgment unit for comparing the measured ultrasonic wave propagation speed with the measured ultrasonic wave propagation speed as a predetermined criterion, and a judgment unit for estimating the degree of deterioration of the test cable. A probe fixture for fixing a probe used in a deterioration diagnosis device, wherein the probe fixture is located below the probe via a probe and a test cable. A probe fixing device comprising: a cable support for supporting a test cable; and a connecting body that connects the probe and the cable support so as to make a half circumference of the test cable. The above problem is solved by a tool.

That is, the probe fixing device of the present invention can fix a probe (hereinafter, also referred to as a probe) at an appropriate angle with respect to a cable by having the above specific configuration. The ultrasonic wave transmitted from the child can be received by the receiver, and the deterioration diagnosis of the cable can be reliably performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a probe fixing device according to the present invention will be described in detail. The probe fixing device of the present invention is used for an apparatus for diagnosing deterioration of a cable covering material, and is used for fixing a probe for transmitting and receiving ultrasonic waves. FIG. Shown in As shown in FIG. 3, the probe fixture includes a probe 2 and a test cable 1.
A cable support 3 for supporting a test cable located below the probe 2 through the probe, and a connector for connecting the probe 2 and the cable support 3 so as to make a half circumference of the test cable 1 There is no particular limitation as long as it consists of 4.

In the fixture, the shape of the cable support 3 is not particularly limited as long as it can support the test cable 1 to be subjected to deterioration diagnosis. Two rollers installed in parallel with the longitudinal direction of the cable may be used, or four spheres installed symmetrically around the test cable to mount the test cable 1 may be used. . When the cable support 3 is a roller as described above, the fixture can be moved in the circumferential direction of the cable disposed on the cable support, so that the fixture can be used for measuring the ultrasonic wave propagation velocity. It is convenient. Further, when the cable support 3 is the four spheres as described above, the fixture can move in the circumferential direction of the cable arranged on the cable support,
And since it becomes possible to move also in the longitudinal direction of the cable,
It is more convenient for measuring the ultrasonic wave propagation velocity.

In the above fixture, the cable support 3
Is located below the probe 2 via the test cable 1 so that the probe can be attached at an appropriate angle to the cable. For example, in the case of the cable support 3 as shown in FIG. 3, the cable support 51 is located below the probe 2 via the cable 1, and in particular, the intermediate portion of the two rollers is located below the probe 2. When the cable 1 is arranged on the cable support 3, the center of the cable 1 is located above the center of the cable support 3, so that the probe 2 moves toward the center of the cable 1. The probe 2 is fixed to the outer periphery of the cable at an angle.
Since the ultrasonic wave transmitted from 1 can be received by the receiver 22, the deterioration diagnosis of the cable can be performed more reliably. In addition, in the case of the cable support 3 as shown in FIG. 4, the deterioration diagnosis of the cable can be performed more reliably by setting the four spherical intermediate portions below the probe.

In the above-mentioned fixing device, the connecting member 4 is
There is no particular limitation as long as the probe 2 and the cable support 3 are connected so as to make a half circumference around the outer circumference of the test cable 1, and the half circumference is a half-circle in an arc shape and a half-circle in a U-shape. , A half-circle in a U-shape, etc.
Any probe may be used as long as the probe 2 and the cable support 3 located above and below the test cable 1 are connected through the outer periphery of the test cable 1. FIG. 3 shows an arc-shaped connector 4 as an example of the connector 4. 4 and 5 show another example of the connector 4 in the fixture. In FIGS. 4 and 5, the connector includes a probe mounting portion 41 on which the probe 2 is mounted, a cable support mounting portion 42 on which the cable support 3 is mounted, and a connecting rod 43. 41 and a cable support attaching portion 42 are connected by a connecting rod 43.

In the fixture according to the present invention, in particular, since cables of various sizes can be fixed, the connecting rod 43 of the connecting member is made movable so that the distance between the cable support 3 and the probe 2 can be reduced. Preferably, it is adjustable.
The structure for making the connecting rod 43 movable is not particularly limited. For example, as shown in FIG. 4, a connecting point between the probe mounting part 41 and the connecting rod 43 and a cable supporting body mounting part 42 and the connecting rod The connecting point with the connecting rod 43 is bendable, and the connecting rod 43 is provided with a bent portion 44, or as shown in FIG. 5, the connecting rod 43 has a telescopic structure. In the fixture shown in FIG. 4, in order to improve the stability at the time of fixing, the probe mounting portion 41 and the cable support mounting portion 42 are connected by a connecting rod 43 and further connected by an elastic body 45. Is preferred.

In the fixture of the present invention, the probe 2 is fixed to the fixture 5 via an elastic body because the probe 2 can be fixed to the deformed cable with a constant pressure. Is preferred. The elastic body is not particularly limited, and examples thereof include rubber and spring. Further, it is preferable that the probe 2 attached to the fixture 5 can be moved in the vertical direction from the viewpoint that the probe 2 can be applied to cables of various sizes.

Further, the fixing device may be used by moving it in the circumferential direction of the cable arranged on the cable support. In the fixing device of the present invention, the moving angle of the fixing device in the circumferential direction is used. In order to know the angle, the fixture may be provided with an angle adjuster. The angle adjuster is not particularly limited as long as the angle of movement of the fixture is known.For example, a needle is placed on a graduated disk, and the needle rotates around the center of the disk along the surface of the disk. In order to make this possible, one end of the needle is attached to the center of the disk, and the other end of the needle is weighted. In this angle adjuster, the end where the weight of the needle is attached is used. Section is always vertically downward,
On the other hand, since the disk rotates together with the fixture, the movement angle of the fixture can be determined by the angle at which the needle points to the scale of the disk.

The probe 2 provided in the probe fixing device of the present invention is used for a device for diagnosing deterioration of a cable coating material. FIG. 6 is a block diagram showing an example of the device. The apparatus includes a probe 2 for transmitting and receiving ultrasonic waves, an arithmetic unit 5 for calculating an ultrasonic wave propagation velocity of the coating material from a time from transmission to reception of the ultrasonic waves and a coating material thickness of the test cable, A determination unit 6 is provided for comparing the ultrasonic wave propagation velocity as a predetermined criterion and the measured ultrasonic wave propagation velocity to estimate the degree of deterioration of the test cable.

In the present invention, the probe 2 includes a transmitter 21 and a receiver 22 for ultrasonic waves, and when performing a cable deterioration diagnosis, the probe 2 is connected to the cable 1 to be diagnosed.
The probe 2 is attached to an appropriate location on the outer peripheral surface of the
Of ultrasonic waves from the ultrasonic transmitter 21 of the conductor 11 of the cable 1
, And the ultrasonic wave transmitted through the coating material and reflected by the inner surface of the coating material is received by the receiver 22.

The arithmetic unit 5 determines the time from transmission to reception of the ultrasonic wave, that is, the ultrasonic wave emitted from the transmitter 21 of the probe 2 is reflected by the conductor 11 of the cable 1 and received by the receiver 22. Is measured by a pulse counter or the like, and the ultrasonic wave propagation velocity in the coating material is calculated from this time and the thickness of the coating material input in advance.

The judging unit 6 calculates the ultrasonic wave propagation speed as a predetermined judgment standard, that is, the ultrasonic wave propagation speed when the coating material is healthy (hereinafter, also referred to as a reference value). This is for estimating the degree of deterioration of the cable in comparison with the ultrasonic wave propagation speed. The estimation of the degree of deterioration of the cable is performed in detail as follows.

The ultrasonic wave propagation velocity changes due to the deterioration of the coating material as compared with the normal state, and the change depends on the degree of the deterioration. Therefore, from the time from the transmission of the ultrasonic wave from the transmitter to the reception of the ultrasonic wave by the receiver, and the thickness of the coating material, the ultrasonic wave propagation speed in the coating material is obtained by the calculation unit, and this speed and the reference value are calculated. The degree of deterioration can be determined by making a comparison in the determination unit. Usually, the ultrasonic wave propagation speed in the deteriorated coating material becomes faster than the reference value, and the ultrasonic wave propagation speed becomes higher as the deterioration progresses. That is, the magnitude of the difference between the reference value and the calculated ultrasonic wave propagation velocity indicates the degree of progress of the deterioration, and the determination unit estimates the degree of the deterioration based on this.

In the above apparatus, the reference value input section 7 is connected to the determination section 6, and a reference value for setting the ultrasonic wave propagation velocity serving as the above-mentioned determination reference is input to the reference value input section 7. Is preferred. This reference value is most preferably obtained in advance at the time of soundness before cable laying, but it is also possible to prepare a sheet of the same material as the covering material and obtain a reference ultrasonic propagation velocity from this sheet. good.

Further, in the above apparatus, the display device 8 is connected to the judging unit 6, and the display device 8 displays the measurement result of the ultrasonic wave propagation velocity in the coating material of the test cable, the estimation result of the deterioration, and the like. Is preferred. Examples of the display device include, for example, a display and a printer. These devices may be configured to be connected to, for example, a personal computer or the like and be operated collectively by predetermined processing software.

The coating material to be diagnosed by the above-mentioned apparatus is not particularly limited, and various organic coating materials are to be diagnosed.
For example, ethylene-propylene rubber, silicone rubber, butyl rubber, polyvinyl chloride, polyethylene, polychlorosulfonated polyethylene, ethylene ethyl acrylate and the like can be mentioned.

[0023]

According to the probe fixing device of the present invention, the probe for transmitting and receiving ultrasonic waves, and the ultrasonic wave of the coating material are determined from the time from transmission to reception of the ultrasonic waves and the coating material thickness of the cable under test. A calculation unit for calculating the propagation speed, and a judgment unit for comparing the measured ultrasonic wave propagation speed with the measured ultrasonic wave propagation speed as a predetermined criterion, and a judgment unit for estimating the degree of deterioration of the test cable. A probe fixture for fixing a probe used in a deterioration diagnosis device, wherein the probe fixture is located below the probe via a probe and a test cable. The probe can be properly connected to the cable by comprising a cable support for supporting the cable under test and a connecting body connecting the probe and the cable support so as to make a half circumference of the cable under test. Can be fixed at various angles The ultrasonic wave transmitted from the transmission terminal of the probe can be received by the probe of the receiving element, it is possible to reliably deterioration diagnosis of the cable. Further, since the probe is attached to the fixture via the elastic body, the deterioration diagnosis of the cable can be performed more reliably. Also, the connecting means is more securely connected to the probe by attaching the probe mounting portion to which the probe is mounted and the cable support mounting portion to which the cable support is mounted by a connecting rod. Deterioration diagnosis can be performed. Further, since the connecting rod is movable, the deterioration diagnosis of the cable can be performed more reliably, and cables of various sizes can be fixed. In addition, the cable support is composed of two rollers installed in parallel with the longitudinal direction of the test cable for mounting the test cable, so that the fixing device is provided for the cable provided on the cable support. Since it can move in the circumferential direction, it is convenient for measuring the ultrasonic wave propagation velocity. Further, the cable support is composed of four spheres which are symmetrically placed around the test cable in order to place the test cable, so that the fixing device is a circle of the cable arranged on the cable support. Since it is possible to move in the circumferential direction and also in the longitudinal direction of the cable, it is more convenient to measure the ultrasonic wave propagation velocity.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a conventional method for diagnosing deterioration of a cable covering material.

FIG. 2 is a diagram for explaining a conventional method for diagnosing deterioration of a cable coating material.

FIG. 3 is a view showing one embodiment of a probe fixing device of the present invention.

FIG. 4 is a view showing another embodiment of the probe fixing device of the present invention.

FIG. 5 is a view showing another embodiment of the probe fixing device of the present invention.

FIG. 6 is a block diagram showing an example of a device for diagnosing deterioration of a cable covering member provided with a probe used in the probe fixing device of the present invention.

[Brief description of reference numerals]

 1: Cable 11: Conductor 12: Coating material 2: Probe 21: Ultrasonic transmitter 22: Ultrasonic receiver 3: Cable support 4: Connecting means 41: Probe mounting part 42: Cable support mounting Part 43: Connecting rod 44: Bend part 45: Elastic body 5: Operation part 6: Judgment part 7: Reference value input part 8: Display device

Claims (6)

[Claims] A probe for transmitting and receiving ultrasonic waves,
An arithmetic unit that calculates the ultrasonic propagation velocity of the coating material from the time from transmission to reception of the ultrasonic wave and the thickness of the coating material of the test cable, and the ultrasonic propagation velocity that is a predetermined criterion and the measured ultrasonic propagation A probe fixing tool for fixing a probe used in a cable coating material deterioration diagnosis apparatus, comprising: a determination unit for estimating the degree of deterioration of the test cable by comparing the speed with the probe; The probe fixing device includes a probe, a cable support for supporting the test cable located below the probe via the test cable, and a probe that extends around the outer periphery of the test cable halfway. A probe fixing device comprising a connector for connecting a probe and a cable support. 2. The probe fixture according to claim 1, wherein the probe is attached to the probe fixture via an elastic body. 3. The connecting means, wherein the probe mounting portion to which the probe is mounted and the cable support mounting portion to which the cable support is mounted are connected by a connecting rod.
The described probe fixture. 4. The probe fixing device according to claim 4, wherein the connecting rod is movable. 5. A cable support is provided in parallel with a longitudinal direction of the test cable for mounting the test cable.
The probe fixing device according to claim 1, which is a book roller. 6. The probe fixing device according to claim 1, wherein the cable support is four spheres symmetrically placed around the test cable for mounting the test cable.