JP6481003B1 - AE measuring device for electric wires - Google Patents

Abstract

An AE measuring device for an electric wire that can easily perform AE measurement for determining the disconnection of the electric wire is provided.
A main pulley 20, a first sub pulley 30, and a second sub pulley 40 are arranged in a staggered pattern on a substrate 10 of an AE measuring apparatus 1, and the main pulley 20 and the first pulley are arranged on each axis. The sub pulley 30 and the second sub pulley 40 are provided, and the main pulley 20, the first sub pulley 30 and the second sub pulley 40 move along the electric wire 300 while holding the electric wire 300. 300 AE waves were measured. Thereby, the AE wave can be measured while keeping the curvature radius, angle, and strength of the electric wire 300 constant, and the stable and accurate AE wave can be easily measured.
[Selection] Figure 1

Description

  The present invention relates to an AE measuring apparatus that detects an AE wave, and more particularly, to an AE measuring apparatus for an electric wire that detects an AE wave for determining whether or not the electric wire is disconnected.

  Conventionally, as a method of detecting disconnection of electric wires such as power lines and signal lines, the conductors at both ends of the electric wires are exposed, an adapter is attached to one end of the conductor, an accelerometer is attached to the other end, and the conductor is connected via the adapter. A method has been proposed in which a reproducible impact is applied and the presence or absence of a broken conductor is detected from a vibration waveform detected by an accelerometer attached to the other end (see Patent Document 1).

  Further, in recent years, an AE (Acoustic Emission) method has been proposed as one index for determining whether or not a wire is disconnected. In this AE method, for example, as shown in FIG. 6, a specific place of the electric wire 300 is bent using a hand or a machine, and the AE wave at the place is measured by the AE sensor 400, thereby The presence or absence of disconnection at that location is determined.

Japanese Patent Laid-Open No. 08-130811

  However, the first conventional method has problems that the conductors at both ends of the electric wire must be exposed and the conductor must be impacted. Furthermore, although this method can detect the presence or absence of disconnection, there is a problem that it cannot detect where the wire is disconnected.

  In the second conventional method, it is difficult to bend the electric wire with a certain radius of curvature, angle and strength, and when the sensor is slid on the electric wire surface for continuous measurement in the length direction. There was a problem that AE due to friction occurred and there was a possibility that it was mistaken for disconnection, and that continuous measurement over the entire length was difficult.

  The present invention has been made to solve such a conventional problem, and suppresses the load on the electric wire as much as possible, facilitates the measurement of the entire length and the location of the broken wire, and the AE measurement for determining the broken wire. It is an object of the present invention to provide an AE measuring device for electric wires that can be easily performed.

  In order to solve such a problem, an AE measuring apparatus for an electric wire according to the present invention is supported by a rotating shaft and supported by a main pulley around which the electric wire is wound, and each rotating shaft. A plurality of sub-pulleys sandwiched between the main pulley and an AE sensor that detects AE waves generated from the electric wires, and the electric wires are held while the electric wires are being clamped by rotation of the main pulley and the plurality of sub-pulleys. It moves along.

  The electric wire AE measuring apparatus according to the present invention includes a main pulley that is pivotally supported on a rotating shaft and on which the electric wire is wound, and a plurality of sub-axes that are pivotally supported on the respective rotating shafts and sandwich the electric wire with the main pulley. A pulley, and an AE sensor that detects an AE wave generated from the electric wire, wherein the electric wire is moved around the main pulley by rotating the main pulley and the plurality of sub pulleys. The position is moved.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized in that the AE sensor is provided on a shaft of the main pulley.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized in that grooves for gripping the electric wires are provided on outer peripheral surfaces of the main pulley and the sub pulley.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized in that it includes driving means for rotating either the main pulley or the sub pulley.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized in that the main pulley or the sub pulley can be attached and detached.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized in that the main pulley and the sub pulley can be changed in diameter.

  Furthermore, the AE measuring apparatus for electric wires according to the present invention is characterized by comprising a disconnection determining means for determining the presence or absence of disconnection of the electric wires based on a detection result of the AE sensor.

  ADVANTAGE OF THE INVENTION According to this invention, the AE measuring apparatus of the electric wire which can perform AE measurement for the disconnection determination of an electric wire easily can be provided.

It is a perspective view which shows an example of the AE measuring apparatus of the electric wire in embodiment of this invention, and a figure which shows the data storage device connected to an AE sensor. It is the front view which shows an example of AE measuring apparatus, and sectional drawing of a pulley. It is a figure which shows an example of the AE measuring apparatus from which the position of an AE sensor differs. It is a figure which shows an example of a perspective view of a motor, and an assembly drawing of a motor. It is a front view which shows an example of the AE measuring device at the time of providing five pulleys. It is a figure explaining the method of the AE measurement of the conventional electric wire.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are diagrams illustrating an example of an AE measuring device for detecting a breakage of an electric wire according to an embodiment of the present invention. In addition, although the electric wire of this Embodiment targets a power line and a signal line, it can respond also to a power transmission line etc. Further, the AE measuring device can measure the electric wire either in an energized state or in a non-energized state. In the energized state, there is an increased possibility of measuring the sound of a minute discharge at a partially disconnected portion as compared to the non-energized state.

  As shown in FIG. 1, the AE measuring apparatus 1 includes a substrate 10, a main pulley 20, a first sub pulley 30, a second sub pulley 40, and an AE sensor 90. The data storage device 200 is connected to the AE sensor 90 via a sensor cable.

  The data storage device 200 stores the detection result detected by the AE sensor 90, and is, for example, a mobile terminal. The data stored in the data storage device 200 is transferred to, for example, a disconnection determination means such as a personal computer in which predetermined analysis software is installed after the detection process is completed, and the detection result of the AE sensor 90 and the presence or absence of disconnection of the electric wire 300 The determination result is analyzed and displayed. Further, the data storage device 200 may have the function of the personal computer, and may determine and notify whether or not the electric wire 300 is disconnected based on the detection result of the AE sensor 90.

  In the present embodiment, the data storage device 200 is connected to the AE sensor 90 by wire, but may be connected wirelessly. The data storage device 200 and the personal computer may be connected wirelessly. In this case, the measurement result and the analysis result may be displayed during the measurement. Further, although the data storage device 200 is a separate medium from the AE measurement device 1, the data storage device 200 may be mounted on the AE measurement device 1. As described above, the determination of whether or not the electric wire 300 is disconnected can be performed by the single unit of the AE measuring apparatus 1.

  Returning to the description of the AE measuring apparatus 1, the substrate 10 is provided with the shaft of the main pulley 20, the shaft of the first sub-pulley 30, and the shaft of the second sub-pulley 40.

  The main pulley 20 is inserted into the shaft of the main pulley 20, and is pivotally supported so as to rotate about this shaft. An electric wire 300 is wound around the main pulley 20.

  The first sub-pulley 30 is inserted into the shaft of the first sub-pulley 30 and is pivotally supported so as to rotate about this shaft. The first sub pulley 30 is configured to rotate while sandwiching the electric wire 300 wound around the main pulley 20 with the main pulley 20.

  Similar to the first sub-pulley 30, the second sub-pulley 40 is inserted into the shaft of the second sub-pulley 40 and is pivotally supported so as to rotate about this shaft. The second sub pulley 40 is configured to rotate while sandwiching the electric wire 300 wound around the main pulley 20 with the main pulley 20.

  Moreover, as shown in FIG. 1, three pulleys (the main pulley 20, the 1st sub pulley 30, and the 2nd sub pulley 40) are arrange | positioned in zigzag form, and each pulley can rotate freely. With this arrangement, the electric wire 300 provided between the pulleys is bent at a predetermined radius of curvature, angle, and strength by the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40.

  The AE sensor 90 is provided on the shaft of the main pulley 20 and detects an AE wave generated from the electric wire 300. In addition, since the AE sensor 90 is provided on the shaft of the main pulley 20 as described above, the AE sensor 90 can always maintain the same distance as the electric wire 300 that is the source of the AE wave. Thereby, the AE sensor 90 can always detect the AE wave generated from the electric wire 300 under a constant condition.

  The main pulley 20 can be detached from the shaft. Further, the AE sensor 90 may be removable along with the removal of the main pulley 20. Further, instead of the main pulley 20, the first sub pulley 30 and the second sub pulley 40 may be removable from the shaft. Furthermore, all of the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40 may be removable from the shaft.

  Further, the outer peripheral surfaces of the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40 are not flat cross sections as shown in FIG. 2 (e), but the center is depressed as shown in FIG. 2 (c). It has a V-shaped cross section. Here, the outer peripheral surface of each pulley is a surface that comes into contact with the electric wire 300, and is a surface that grips the electric wire between the pulleys. The outer peripheral surfaces of the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40 are not limited to a V-shaped cross section, but a U-shaped cross section as shown in FIG. It may be the cross-sectional shape of the mold. Thus, the outer peripheral surfaces of the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40 can be prevented from falling off the electric wire 300 being measured by making the center concave.

  Next, an AE measurement procedure in the AE measurement apparatus 1 configured as described above will be described.

  First, in the AE measuring device 1, the main pulley 20 is removed from the shaft of the main pulley 20. Then, the electric wire 300 is bridged along the grooves on the outer peripheral surfaces of the first sub pulley 30 and the second sub pulley 40. At this time, the first sub-pulley 30 and the second sub-pulley 40 are arranged so as to have a sufficient margin so that the electric wire 300 sag.

  Next, the main pulley 20 is inserted into the shaft. At this time, the electric wire 300 is fitted into the groove on the outer peripheral surface of the main pulley 20, and the electric wire 300 is held between the main pulley 20, the first sub-pulley 30 and the second sub-pulley 40. As described above, when the electric wire 300 is bent along the main pulley 20, sound (sound wave) is generated from the bent portion or the extended portion of the electric wire 300.

  Next, when the electric wire 300 can be disposed between the main pulley 20 and the first sub-pulley 30 and the second sub-pulley 40, detection of the AE wave of the electric wire 300 by the AE sensor 90 is started. The AE sensor 90 detects sound waves generated from the electric wire 300 generated as described above.

  When the detection by the AE sensor 90 can be started normally, the first sub pulley 30 and the second sub pulley 40 are rotated together with the main pulley 20, and the electric wire 300 is moved relative to the AE measuring device 1, The position of the electric wire 300 in contact with the outer peripheral surface of the main pulley 20 is shifted. In this movement, the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40 may be rotated and moved by pulling one of the wires 300, or both ends of the wire 300 may be moved. And the AE measuring device 1 is moved relative to the electric wire 300 (while rotating the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40). Also good.

  Thereby, the AE wave of the electric wire 300 is detected by the AE sensor 90 while moving the electric wire 300 relative to the AE measuring device 1, and the measurement is performed over the entire length of the electric wire 300. In addition, if detection is performed from one end to the other end of the electric wire 300 by the AE measuring device 1, detection accuracy can be further improved by performing detection from the other end to the other end in the reverse direction. In addition, when only a specific location is required to be detected, it is only necessary to measure only a location that requires a predetermined detection.

  As described above, the AE sensor 90 is attached to the shaft of the main pulley 20, the electric wire 300 is bent along the outer periphery of the main pulley 20, and the main pulley 20, the first sub pulley 30, and the second sub pulley 40 are used. Since the wire 300 is moved while being sandwiched, the electric wire 300 can be easily bent with a certain radius of curvature, angle, and strength. In this way, the inspection conditions can be easily made the same, and the electric wire 300 can be measured by the AE sensor 90. Therefore, the disconnection determination is accurately performed over the entire length of the electric wire 300 based on the measurement result by the AE sensor 90. be able to.

  Further, since the AE sensor 90 is attached to the shaft of the main pulley 20 and the electric wire 300 is bent along the outer periphery of the main pulley 20, no noise is generated due to friction during continuous measurement, and the sensor from the AE wave generating source is used. Can be made constant, and accurate measurement can be performed. Furthermore, since the electric wire 300 can be moved by the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40, continuous measurement over the entire length can be easily performed.

  Since the main pulley 20 is attached to the shaft with the AE sensor 90, it is preferable that the main pulley 20 be made of metal in order to avoid attenuation of the AE wave. However, the first sub-pulley 30 and the second sub-pulley 40 other than that are made of MC nylon, , Made of resin such as UHMW (ultra high molecular weight polyethylene).

  Further, the AE sensor 90 may be attached not only to the shaft of the main pulley 20 but also to the shaft of the first sub pulley 30, the shaft of the second sub pulley 40, or the like. In this case, the pulley to which the AE sensor 90 is attached is preferably made of metal, but the main pulley 20 and the first sub pulley 30 or the second sub pulley 40 to which the AE sensor 90 is not attached are made of resin. May be.

  Further, the AE sensor 90 is not limited to the shaft of each pulley, and may be provided at a predetermined fixed position such as just below the shaft of the main pulley 20 outside the main pulley 20 as shown in FIG.

Furthermore, as shown in FIG. 4, the main pulley 20 may be provided with driving means such as a motor 80 to drive the main pulley 20. Thereby, by driving the motor 80, the AE measuring device 1 can be automatically moved along the electric wire 300, and the measurement of the AE wave can be measured over the entire length of the electric wire 300.
Further, the driving means such as the motor 80 may be attached to the first sub pulley 30 or the second sub pulley 40 without being limited to the main pulley 20.

It is also possible to change the diameters of the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40.
For example, instead of the main pulley 20, a main pulley having a larger diameter than the main pulley 20 is provided, and instead of the first sub-pulley 30 and the second sub-pulley 40, the first sub-pulley having the smaller diameter and the first sub-pulley What is necessary is just to provide 2 sub pulleys.
Thereby, the curvature radius can be changed and the AE wave of the electric wire 300 can be measured.

  Further, the positions of the shafts of the first sub-pulley 30 and the second sub-pulley 40 can be changed, and the main pulley, the first sub-pulley, and the second sub-pulley can be installed with the same diameter. In this case, for example, the substrate 10 may be provided with a plurality of installation locations for the shafts of the first sub-pulley and the second sub-pulley. It can be changed).

Further, FIG. 5 shows and describes another embodiment of the AE measuring apparatus.
As shown in FIG. 5, the AE measuring device 2 includes a substrate 11, a main pulley 20, a first sub pulley 30, a second sub pulley 40, an AE sensor 90, and a third sub pulley 50. , A fourth sub pulley 60. In the AE measuring device 2, the data storage device 200 is connected to the AE sensor 90 with a sensor cable.

  Here, the main pulley 20, the first sub pulley 30, the second sub pulley 40, the AE sensor 90, and the data storage device 200 are the same as those described in the AE measuring device 1, and thus the description thereof is omitted.

  The substrate 11 includes an axis of the main pulley 20, an axis of the first sub pulley 30, an axis of the second sub pulley 40, an axis of the third sub pulley 50, and an axis of the fourth sub pulley 60. Is provided.

  The third sub-pulley 50 is inserted into the shaft of the third sub-pulley 50 and is pivotally supported so as to rotate about this shaft. The third sub pulley 50 is configured to rotate while sandwiching one end of the electric wire 300 wound around the main pulley 20 with the first sub pulley 30.

  The fourth sub-pulley 60 is inserted into the shaft of the fourth sub-pulley 60 and is pivotally supported so as to rotate about this shaft. The fourth sub pulley 60 is configured to rotate while sandwiching the other end of the electric wire 300 wound around the main pulley 20 with the second sub pulley 40.

As described above, the AE measuring device 2 connects the ends of the electric wire 300 wound around the main pulley 20 to the first sub pulley 30 and the third sub pulley 50, and the second sub pulley 40 and the fourth sub pulley 60. Therefore, the position of the electric wire 300 can be stabilized, the labor of the operator can be saved, and the measurement accuracy of AE can be improved.
Note that when there are three pulleys, there are advantages such as a reduction in the number of parts and a reduction in the size of the device itself, so it is preferable to select according to the situation.

  As described above, the AE measuring apparatus according to the present embodiment rotates and measures the AE wave while holding the electric wire 300 between the main pulley 20, the first sub-pulley 30, and the second sub-pulley 40. Therefore, the AE wave can be measured while keeping the radius of curvature, angle and strength constant, and the stable and accurate AE wave can be easily measured.

  Moreover, since the AE measuring apparatus in this Embodiment provided the AE sensor 90 in the axis | shaft of the main pulley 20, it can receive an AE wave equally with respect to the bending of the electric wire 300, and is stable. AE waves can be measured accurately.

  Furthermore, since the AE measuring apparatus in the present embodiment is provided with a groove for gripping the electric wire 300 on the outer peripheral surface of each pulley, the AE measuring device prevents the electric wire 300 from falling off during measurement, and provides a stable and accurate AE wave. It can be measured easily.

  Furthermore, since the AE measuring apparatus according to the present embodiment is provided with the motor 80 in the main pulley 20 and rotates the main pulley 20, the AE wave can be automatically measured over the entire length of the electric wire 300. .

  Furthermore, since the AE measuring apparatus in the present embodiment is configured such that the main pulley 20 or each sub pulley can be attached and detached, the electric wire 300 can be easily set.

  Furthermore, since the AE measuring apparatus in the present embodiment can change the diameter of the main pulley 20 and each sub-pulley, the radius of curvature, angle, and strength of the electric wire 300 can be easily changed. Measurements suitable for the electric wires to be measured can be performed.

  Furthermore, the AE measuring apparatus in the present embodiment can be provided with a portable terminal having an analysis function, and can easily perform the determination of the disconnection of the electric wire 300.

DESCRIPTION OF SYMBOLS 1, 2 AE measuring apparatus 10, 11 Board | substrate 20 Main pulley 30 1st sub pulley 40 2nd sub pulley 50 3rd sub pulley 60 4th sub pulley 80 Motor 90, 400 AE sensor 200 Data storage device 300 Electric wire

Claims (7)

A main pulley that is pivotally supported by a rotating shaft and on which an electric wire is wound;
A plurality of sub-pulleys that are pivotally supported by the respective rotation shafts and sandwich the electric wire with the main pulley;
An AE sensor for detecting an AE wave generated from the electric wire;
With
The AE sensor is provided on the shaft of the main pulley,
An AE measuring apparatus for an electric wire that moves along the electric wire while sandwiching the electric wire by rotation of the main pulley and the plurality of sub pulleys. A main pulley that is pivotally supported by a rotating shaft and on which an electric wire is wound;
A plurality of sub-pulleys that are pivotally supported by the respective rotation shafts and sandwich the electric wire with the main pulley;
An AE sensor for detecting an AE wave generated from the electric wire;
With
The AE sensor is provided on the shaft of the main pulley,
An electric wire AE measuring apparatus, wherein the electric wire is moved by the rotation of the main pulley and the plurality of sub pulleys to move the position of the electric wire wound around the main pulley. On the outer peripheral surface of the main pulley and the sub pulley, a groove for gripping the electric wire is provided,
The AE measuring apparatus for electric wires according to claim 1 or claim 2 , wherein Drive means for rotating either the main pulley or the sub pulley is provided,
The AE measuring apparatus for an electric wire according to any one of claims 1 to 3 , wherein the AE measuring apparatus is an electric wire. The main pulley or the sub pulley can be attached and detached.
The AE measuring device for an electric wire according to any one of claims 1 to 4 , wherein the AE measuring device is an electric wire. The main pulley and the sub pulley can be changed in diameter.
The electric wire AE measuring apparatus according to claim 5 . Disconnection determining means for determining the presence or absence of disconnection of the electric wire based on the detection result of the AE sensor;
The AE measuring device for an electric wire according to any one of claims 1 to 6 , wherein the AE measuring device is provided.