Stranded wire internal deterioration detection device

Abstract

The present invention provides a corrosion degradation detection device that can determine the deterioration of stranded wire while the winding grip is still wound and installed on a support material. [Solution] The stranded wire internal deterioration detection device detects deterioration inside a stranded wire supported by a support material. The stranded wire internal deterioration detection device includes an eddy current flaw detection probe for detecting deterioration inside the stranded wire. The support material supports the stranded wire in a direction intersecting the stranded wire and has an opening that extends in a direction along the stranded wire. The eddy current flaw detection probe has a shape that follows only a part of the outer circumference of the stranded wire. The device includes a jig for holding the eddy current flaw detection probe, and the jig is movable along the stranded wire by passing through the opening in the support material.

Description

Technical Field

[0001] This invention relates to a twisted wire internal deterioration detection device for detecting deterioration inside a twisted wire.

Background Art

[0002] The inspection of twisted wires used in electric railway trolley wires (so-called overhead wires) mainly relies on visual inspection. While the outer surface strands can be confirmed, the internal strands cannot be inspected. In the inspection of twisted wires, eddy current flaw detection may be applied in some cases, but conventional methods using a through coil or the like could not be applied when there were obstacles at the inspection location.

[0003] Such an automatic inspection of twisted wires is disclosed, for example, in "Automatic Inspection of Electric Wires" (Non-Patent Document 1). According to Non-Patent Document 1, a corrosion deterioration determination device using eddy current is used to perform corrosion deterioration determination of twisted wires. When there is a corrosion deterioration location in the twisted wire, the flow of eddy current changes at that location, so the current of the detector (inspection coil) of the corrosion deterioration determination device changes. Here, the detector of the corrosion deterioration determination device is attached so as to cover the entire circumference of the twisted wire being inspected, and detects the corrosion of the twisted wire.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional devices for detecting the corrosion and deterioration of stranded wires using eddy currents had the configuration described above to determine the corrosion and deterioration of stranded wires. In conventional devices for detecting the corrosion and deterioration of stranded wires, it was necessary to cover the stranded wire from the surroundings with the excitation coil and detection coil of the flaw detection probe. On the other hand, the stranded wire is supported by support material at regular intervals, and deterioration of the stranded wire occurs near the support material. Since the stranded wire near the support material is wrapped with a protective grip, the support material hinders the movement of the flaw detection probe, resulting in the problem that deterioration of the stranded wire cannot be detected.

[0006] This invention was made to address the above-mentioned problems, and aims to provide a corrosion deterioration detection device that can determine the deterioration of stranded wire while the winding grip is still wound and installed on a support material. [Means for solving the problem]

[0007] The stranded wire internal deterioration detection device according to this invention detects deterioration inside a stranded wire supported by a support material. The stranded wire internal deterioration detection device includes an eddy current flaw detection probe for detecting deterioration inside the stranded wire. The support material supports the stranded wire in a direction intersecting the stranded wire and has an opening that extends in a direction along the stranded wire. The eddy current flaw detection probe has a split shape that follows only a part of the outer circumference of the stranded wire. The device includes a jig for holding the eddy current flaw detection probe, and the jig is movable along the stranded wire through the opening in the support material.

[0008] Preferably, the eddy current testing probe detects deterioration inside the stranded wire using signals of multiple different frequencies.

[0009] More preferably, a shielding plate is placed around the eddy current testing probe.

[0010] The fixture may be a guided scanning fixture in which the eddy current testing probe moves along the stranded wire. [Effects of the Invention]

[0011] According to this invention, deterioration inside the stranded wire is detected using a split-shaped eddy current flaw detection probe held by a jig, and the jig is movable along the stranded wire by passing through an opening in the support material. As a result, a stranded wire internal deterioration detection device is provided that can detect deterioration inside the stranded wire from above the winding grip while the equipment remains in place. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing the detection of stranded wire deterioration using an eddy current flaw detection probe held in a jig according to the present invention. [Figure 2] Figure 1 shows the view from the direction indicated by arrow 2-2. [Figure 3] Figure 1 shows a cross-sectional view taken from the direction indicated by arrow 3-3. [Figure 4] Figure 1 shows the view from the direction indicated by arrow 4. [Figure 5] This is a block diagram showing the configuration of the control unit for an eddy current testing device. [Modes for carrying out the invention]

[0013] Hereinafter, an embodiment of this invention will be described with reference to the drawings. Figure 1 is a perspective view showing the state in which deterioration of stranded wire 25 is detected by the eddy current flaw detection probe 10 held in the jig 14 in the present invention, Figure 2 is a view from the direction indicated by arrow 2-2 in Figure 1, Figure 3 is a cross-sectional view from the direction indicated by arrow 3-3 in Figure 1, and Figure 4 is a front view from the direction indicated by arrow 4 in Figure 1 showing the state in which deterioration of stranded wire (not shown) is detected by the eddy current flaw detection probe 10 held in the jig 14. The state in which deterioration of stranded wire 25 is detected by the eddy current flaw detection probe 10 in the present invention will be described with reference to Figures 1 to 4.

[0014] Here, the stranded wire 25 is, for example, a feeder wire or a suspension wire, which extends in a straight line, but here we are showing a state where deterioration has been detected in a portion of it.

[0015] As shown in Fig. 1, the twisted wire 25 is supported by the support member 22 at regular intervals. The support member 22 supports the twisted wire 25 in a direction intersecting the twisted wire 25 and has an opening 22a extending in the direction along the twisted wire 25.

[0016] The eddy current flaw detection probe 10 is held by the jig 14 and has a half-cracked shape covering approximately half of the circumference of the twisted wire 25. The eddy current flaw detection probe 10 held by the jig 14 is held by the holding rod 16 via the holding portion 15, can move along the twisted wire 25 through the opening 22a of the support member 22, and can detect deterioration inside the twisted wire 25 while moving.

[0017] As shown in Fig. 3, the jig 14 includes a rectangular parallelepiped holding portion 15 that holds the eddy current flaw detection probe 10, a holding rod 16 extending from the holding portion 15, and a gripping portion 17 provided at the tip of the holding rod 16. The holding rod 16 includes a ball joint 18 in the middle thereof, and the holding rod 16 can be bent in a direction intersecting the direction in which the holding rod 16 extends at that position.

[0018] A pair of twisted wire clamps 20, 21 are provided to support the twisted wire 25 in the direction of its extension so as to sandwich the support member 22 of the twisted wire 25. The pair of twisted wire clamps 20, 21 have a connecting rod holding portion 23 that holds a connecting rod 19 extending along the twisted wire 25 from the holding portion 15.

[0019] That is, a pair of twisted wire clamps 20, 21 are provided along the twisted wire 25 to be detected so that the eddy current flaw detection probe 10 smoothly moves along the twisted wire 25 during detection. In this way, since the jig 14 is a guided scanning jig, the rattle signal during probe scanning can be reduced.

[0020] As shown in Fig. 3, the holding portion 15 holds a semi-cylindrical eddy current flaw detection probe 10 and a shielding plate (steel plate) 12c made of a thin steel plate with an arc shape provided on the outer periphery of the eddy current flaw detection probe 10. The eddy current flaw detection probe 10 has an arc-shaped inner peripheral portion 10a along approximately half of the circumference of the twisted wire 25 and an arc-shaped outer peripheral portion 10b provided outside thereof.

[0021] As the shielding plate covering the outer periphery of the eddy current flaw detection probe 10, not only the above-described arc-shaped shielding plate 12c but also shielding plates 12a and 12b that cover the semi-cylindrical side surfaces of the eddy current flaw detection probe 10 extending in a direction intersecting it are provided.

[0022] Thus, by providing the shielding plates 12a to 12c around the eddy current flaw detection probe 10, unnecessary signals such as support material signals emitted from the support material 22 can be removed.

[0023] Next, the configuration of the control unit of the eddy current flaw detection test device that performs the above-described processing of the eddy current flaw detection probe 10 in this embodiment will be described. FIG. 5 is a block diagram showing the configuration of the control unit 28 of the eddy current flaw detection test device 26. Referring to FIG. 5, the eddy current flaw detection test device 26 includes a measurement device 27 and an eddy current flaw detection probe 10 connected to the measurement device 27. The measurement device 27 includes a transmission / reception device 29 that receives detection data from the eddy current flaw detection probe 10 and transmits it to the control unit 28. The control unit 28 includes a CPU 30 that controls the entire measurement device 27, an interface 31, an input / output unit (I / O) 32, a memory 33, a display unit 34, and a transmitter 35 that emits the frequency used for the detection of the eddy current flaw detection probe 10.

[0024] In this embodiment, the eddy current flaw detection probe 10 removes noise by simultaneously adding and synthesizing a plurality of different frequencies emitted by the transmitter 35, and detects the deterioration of the stranded wire 25.

[0025] That is, in this embodiment, since the eddy current flaw detection probe 10 performs flaw detection of the stranded wire using dual frequencies, unnecessary signals from the support material can be removed.

[0026] Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various changes can be made to the illustrated embodiments within the same range or equivalent range of the present invention.

Industrial Applicability

[0027] This invention provides a stranded wire internal deterioration detection device that can detect deterioration inside the stranded wire from above the winding grip while the device remains in its installed state, and is therefore advantageously used as a stranded wire internal deterioration detection device. [Explanation of symbols]

[0028] 10 Eddy current flaw detection probe, 12 Shielding plate (steel plate), 14 Jig, 15 Holding part, 16 Holding rod, 17 Gripping part, 18 Ball joint, 19 Connecting rod, 20, 21 Stranded wire clamp, 22 Support material, 22a Opening, 23 Connecting rod holding part, 24 Winding grip, 25 Stranded wire, 26 Eddy current flaw detection testing apparatus, 27 Measuring device, 28 Control unit, 29 Transmitter / receiver, 30 CPU, 31 I / F, 32 I / O, 33 Memory, 34 Display unit, 35 Transmitter.

Claims

1. A device for detecting deterioration inside a stranded wire supported by a support material, Includes an eddy current testing probe for detecting deterioration inside the stranded wire, The support material supports the stranded wire in a direction intersecting the stranded wire and has an opening that extends in a direction along the stranded wire. The eddy current flaw detection probe has a split shape that follows only a portion of the outer circumference of the stranded wire, The fixture has a jig for holding the eddy current flaw detection probe, The jig is movable along the stranded wire, passing through the opening of the support material. A device for detecting internal deterioration of stranded wire.

2. The stranded wire internal deterioration detection device according to claim 1, wherein the eddy current flaw detection probe detects deterioration inside the stranded wire using signals of multiple different frequencies.

3. The twisted wire internal deterioration detection device according to claim 1 or 2, wherein a shielding plate is arranged around the eddy current flaw detection probe.

4. The twisted wire internal deterioration detection device according to claim 1 or 2, wherein the jig is a guided scanning jig on which the eddy current flaw detection probe moves along the twisted wire.

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