JP2023137140A - Wire rope inspection device and wire rope inspection method - Google Patents

Abstract

To provide a wire rope inspection device capable of quantitatively acquiring the size of a defect of a wire rope.SOLUTION: A wire rope inspection device (100) includes: a detection coil (10) for detecting a change of a magnetic flux of a wire rope while moving relative to the wire rope; and a processing section (122) for acquiring the size of a defect of the wire rope on the basis of a signal integration waveform obtained by integration processing on a signal waveform based on a detection signal of the detection coil (10).SELECTED DRAWING: Figure 2

Description

The present invention relates to a wire rope inspection device and a wire rope inspection method.

BACKGROUND ART Conventionally, a magnetic material inspection device for inspecting a wire rope is known (for example, see Patent Document 1).

The above-mentioned Patent Document 1 discloses a magnetic substance inspection device that detects the magnetic flux of a wire rope and inspects the wire rope. This magnetic material inspection device integrates a measurement waveform that detects the magnetic flux of a wire rope, and converts it into an integral waveform that makes it easier to understand the state of the wire rope (defect state) than the measurement waveform. The presence or absence of defects in the wire rope can be determined by the integrated waveform converted by the magnetic material inspection device.

JP 2019-168253 Publication

According to the magnetic substance inspection apparatus described in Patent Document 1, although it is possible to obtain the presence or absence of a defect in the wire rope, it is not possible to obtain the size of the defect that has occurred in the wire rope. Therefore, there is a need for a wire rope inspection device and a wire rope inspection method that can quantitatively obtain the size of defects in wire ropes.

This invention has been made to solve the above-mentioned problems, and one object of the invention is to provide a wire rope inspection device that can quantitatively obtain the size of defects in a wire rope. and a wire rope inspection method.

A wire rope inspection device according to a first aspect of the invention includes a detection coil that detects a change in magnetic flux of the wire rope while moving relative to the wire rope, and a signal waveform that is integrated based on a detection signal of the detection coil. A processing unit that obtains the size of a defect in the wire rope based on the processed signal integral waveform.

A wire rope inspection method according to a second aspect of the invention includes a detection step of detecting a change in the magnetic flux of the wire rope while moving relative to the wire rope, and a signal waveform based on the detection signal detected in the detection step. and an acquisition step of acquiring the size of the defect in the wire rope based on the signal integral waveform obtained by integrating the signal.

Here, the inventor of the present application focused on a signal integral waveform obtained by integrating a signal waveform based on a detection signal of a detection coil that detects a change in magnetic flux of a wire rope. As a result of intensive studies, the inventor has found that there is a correlation between the signal integral waveform obtained by integrating the signal waveform based on the detection signal of the detection coil and the size of the defect in the wire rope. This heading led us to the invention of the present application.

That is, according to the wire rope inspection device according to the first aspect of the present invention and the wire rope inspection method according to the second aspect, the wire rope is The size of the defect at is obtained. Thereby, the size of the defect in the wire rope can be quantitatively obtained from the size of the defect in the wire rope obtained based on the signal integral waveform.

1 is a schematic diagram showing the overall configuration of a wire rope inspection device according to an embodiment of the present invention. 1 is a block diagram showing the overall configuration of a wire rope inspection device according to an embodiment of the present invention. FIG. 3 is a schematic diagram showing the arrangement of a detection coil and an excitation coil in the Z direction. FIG. 3 is a diagram showing the configuration of a magnetic shunt section. 4 is a schematic diagram showing the arrangement of a detection coil and an excitation coil in a cross section taken along line 800-800 in FIG. 3. FIG. FIG. 2 is a schematic diagram showing the arrangement of detection coils during normal operation of the elevator. FIG. 3 is a diagram showing detection of excitation magnetic flux by a detection coil. FIG. 6 is a diagram showing detection of excitation magnetic flux in a defect-occurring portion by a detection coil. FIG. 3 is a diagram showing integration processing for a signal waveform. FIG. 3 is a diagram showing subtraction processing for a signal integral waveform. 2 is a graph showing a signal integral waveform and an integral peak height obtained when inspecting a portion where a defect occurs. 7 is a graph showing the relationship between the height of an integral peak and the amount of change in cross-sectional area. 2 is a graph showing a signal integral waveform and an inflection point interval of integral peaks obtained when inspecting a defect-occurring portion where the cross-sectional area of a wire rope is reduced. 2 is a graph showing a signal integral waveform and an inflection point interval of integral peaks obtained when inspecting a defect-occurring portion where the cross-sectional area of the wire rope increases. It is a graph showing the relationship between the inflection point interval of the integral peak and the length of a defect. It is a figure showing an example of defect information displayed on a display part. FIG. 3 is a diagram illustrating an example of a processing flow for acquiring defect information. FIG. 7 is a diagram showing another example of defect information displayed on the display unit.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described based on the drawings.

The configuration of the wire rope inspection device 100 according to this embodiment will be described with reference to FIGS. 1 to 16. In the following description, "orthogonal" means intersecting at 90 degrees and at an angle near 90 degrees.

(Configuration of wire rope inspection device)
The wire rope inspection apparatus 100 (see FIG. 1) is an apparatus for inspecting a wire rope W, which is an object to be inspected, for defects 200 (see FIG. 8) such as wire breakage, adhesion of foreign matter, and rust. The wire rope inspection device 100 analyzes (determines) the condition of the wire rope W, such as the presence or absence of defects 200 in the wire rope W, using the total magnetic flux method, thereby detecting deterioration (abnormality) of the wire rope W that is difficult to visually confirm. It is a device that can be confirmed. When the wire rope W includes a defect 200, the magnetic flux in the portion where the defect 200 occurs is different from that in the normal portion. The total magnetic flux method is different from a method that measures only leakage magnetic flux from defects 200 on the surface of the wire rope W, and is a method that can also measure defects 200 such as wire breaks and rust inside the wire rope W.

As shown in FIG. 1, the wire rope inspection device 100 includes an inspection device body 101 that measures the magnetic flux of the wire rope W, and a processing terminal 102 that acquires and processes data based on the detection signal acquired by the inspection device body 101. It is equipped with The processing terminal 102 is, for example, a tablet terminal such as a tablet PC (Personal Computer). Note that the processing terminal 102 may be a smartphone or a notebook PC. The processing terminal 102 analyzes results based on the measurement results of the magnetic flux of the wire rope W by the inspection apparatus main body 101 and the measurement results of the magnetic flux of the wire rope W by the inspection apparatus main body 101, such as defect information 81 (see FIG. 16), which will be described later. It is configured to display (inspection results), etc. Note that the defect information 81 is an example of "information based on the size of a defect in the wire rope" in the claims.

By inspecting the wire rope W using the wire rope inspection device 100, a user (worker) can confirm defects 200 (abnormalities) in the wire rope W that are difficult to visually confirm. FIG. 1 shows an example in which the inspection device main body 101 inspects a wire rope W used for moving a car 901 of an elevator 900.

The elevator 900 includes a car 901, a sheave (pulley) 902, a sheave 903, and a wire rope W. The elevator 900 is configured to move a car 901 carrying people, cargo, etc. in an up-down direction (vertical direction) by rotating a sheave 902 provided in a hoist and hoisting a wire rope W. .

The inspection device main body 101 is fixed so as not to move relative to the wire rope W, and inspects the wire rope W moved by the sheave 902 of the hoist for abnormalities. In FIG. 1, the inspection apparatus main body 101 is attached to a position between the sheave 902 and the sheave 903, but the attachment position of the inspection apparatus main body 101 is not limited to this.

The wire rope W is formed by twisting a plurality of strands of wire material, and is a magnetic body made of a long material extending along the Z direction. Note that the strand is composed of a plurality of wires twisted together. The wire rope W is inspected by a wire rope inspection device 100 (inspection device main body 101) in order to prevent breakage due to deterioration. Then, the wire rope W whose degree of deterioration (abnormality) is determined to exceed a predetermined standard based on the result of measuring the magnetic flux of the wire rope W is replaced by the user (worker).

The inspection device main body 101 measures the magnetic flux of the wire rope W while moving relatively to the wire rope W along the surface of the wire rope W. When the wire rope W itself moves, such as the wire rope W used in the elevator 900, the wire rope W (elevator 900) is moved relative to the inspection device main body 101 while the wire rope W is moved by the inspection device main body 101. The magnetic flux of W is measured. Thereby, the magnetic flux at each position in the longitudinal direction (Z direction) of the wire rope W can be measured, so that the defect 200 (abnormality) at each position in the longitudinal direction of the wire rope W can be inspected.

(Configuration of inspection device body)
As shown in FIG. 2, the inspection device main body 101 of the wire rope inspection device 100 includes a detection coil 10, an excitation coil 20, a circuit board 30, a magnetization unit 40, and a coil moving mechanism 50.

The detection coil 10 is configured to detect changes in the magnetic flux of the wire rope W while moving relatively to the wire rope W. Further, the detection coil 10 includes a first detection coil 11 and a second detection coil 12.

The first detection coil 11 and the second detection coil 12 transmit a detection signal (output a voltage) according to the detected magnetic flux of the wire rope W. The first detection coil 11 and the second detection coil 12 are electrically connected to the circuit board 30. The detection coil 10 is configured to detect the magnetic flux inside the wire rope W using the total magnetic flux method. Note that a detailed description of the detection coil 10 (first detection coil 11 and second detection coil 12) will be given later.

The excitation coil 20 is configured to apply a magnetic field to the wire rope W. Specifically, an alternating current is passed through the excitation coil 20, and as the current periodically flows, the excitation coil 20 generates a magnetic field inside (inside the coil) and periodically generates a magnetic field. This magnetic field is applied to the wire rope W disposed inside. That is, the excitation coil 20 is configured to excite the state of magnetization of the wire rope W. Further, the excitation coil 20 is configured to move relative to the wire rope W.

Further, the circuit board 30 includes a control section 31 , an excitation I/F 32 (interface), a reception I/F 33 , a power supply circuit 34 , a storage section 35 , and a communication section 36 . The circuit board 30 is a printed circuit board (PCB) on which a wiring pattern is formed using a conductor and electronic components are mounted.

The control unit 31 is configured to control each part of the inspection device main body 101. The control unit 31 includes a processor such as a CPU (Central Processing Unit), a memory, an AD converter, and the like.

Excitation I/F 32 receives a control signal from control section 31. The excitation I/F 32 controls the supply of power to the excitation coil 20 based on the received control signal.

The reception I/F 33 processes the detection signal detected by the detection coil 10 (each of the first detection coil 11 and the second detection coil 12). The reception I/F 33 receives (obtains) the detection signal from the detection coil 10 and transmits it to the control unit 31 . The reception I/F 33 includes an amplifier. The reception I/F 33 amplifies the detection signal of the detection coil 10 using an amplifier and transmits it to the control unit 31.

The power supply circuit 34 receives power from the outside and supplies power to each part of the inspection apparatus main body 101 such as the excitation coil 20. The storage unit 35 is a storage medium including, for example, a flash memory, and stores (saves) information such as measurement results (measurement data) of the wire rope W. The communication unit 36 is a communication interface, and connects the inspection apparatus main body 101 and the processing terminal 102 in a communicable manner.

The magnetic adjustment section 40 is configured to adjust the magnetic flux of the wire rope W to which a magnetic field is applied by the excitation coil 20. The magnetization section 40 is configured to apply a magnetic field to the wire rope W to adjust the magnetization direction of the wire rope W (magnetization adjustment). Note that a detailed explanation of the magnetization unit 40 will be given later.

The coil moving mechanism 50 includes a support section 51 that supports the detection coil 10 (the first detection coil 11 and the second detection coil 12), and a drive section 52 that moves the support section 51. The drive unit 52 includes an actuator (not shown) such as a motor that is controlled by the control unit 31. The drive section 52 is configured to move the support section 51 under the control of the control section 31. Note that a detailed explanation of the movement of the detection coil 10 by the coil movement mechanism 50 will be described later.

(Processing terminal configuration)
The processing terminal 102 of the wire rope inspection device 100 includes a communication section 121, a processing section 122, a storage section 123, and a display section 124.

The communication unit 121 is a communication interface, and connects the inspection apparatus main body 101 and the processing terminal 102 in a communicable manner. The processing terminal 102 receives the measurement results of the wire rope W by the inspection device main body 101 (data of the detection signal detected by the detection coil 10) via the communication unit 121.

The processing section 122 is configured to control each section of the processing terminal 102. The processing unit 122 includes a processor such as a CPU, a memory, and the like. In the present embodiment, the processing unit 122 is configured to obtain the size of the defect 200 in the wire rope W based on the signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. There is.

The storage unit 123 is a storage medium including, for example, a flash memory, and stores data such as measurement results of the wire rope W (data of the detection signal detected by the detection coil 10) and analysis results based on the measurement results of the wire rope W. to remember (save).

The display unit 124 is, for example, a touch panel display including a liquid crystal display or an organic EL display. That is, the display unit 124 displays information such as the measurement results of the wire rope W and the analysis results based on the measurement results of the wire rope W, and also accepts touch operations from the user (worker). In this embodiment, the display unit 124 is configured to display defect information 81 (see FIG. 16), which will be described later. Further, the wire rope inspection device 100 is configured such that the inspection device main body 101 can be operated by a user operating the processing terminal 102 .

Further, the elevator 900 is provided with a plurality of wire ropes W, as shown in FIG. The plurality of wire ropes W are provided so as to be lined up (parallel to each other) in a direction (X direction) orthogonal to each longitudinal direction (Z direction). The inspection device main body 101 also includes a detection unit 60 in which a detection coil 10 (a first detection coil 11 and a second detection coil 12) and an excitation coil 20 are provided. The detection unit 60 of the inspection device main body 101 is fixed so as not to come into contact with the wire rope W.

A plurality of detection coils 10 are provided corresponding to the plurality of wire ropes W. That is, the same number of detection coils 10 as the plurality of wire ropes W are provided. For example, when there are six wire ropes W, six detection coils 10 (first detection coil 11 and second detection coil 12) are provided. The detection coil 10 is configured to move relatively along the Z direction in which the plurality of wire ropes W extend, and to detect changes in the magnetic flux of the wire ropes W.

Further, the magnetic adjustment section 40 is provided separately from the detection unit 60. Further, the magnetic shunt section 40 is fixed on the Z2 direction side of the detection unit 60 so as not to come into contact with the plurality of wire ropes W. Note that the magnetization adjusting section 40 may be provided integrally with the detection unit 60 in which the detection coil 10 and the excitation coil 20 are provided.

(Configuration of magnetizing section)
The magnetic adjustment unit 40 is configured to apply a magnetic field to the wire rope W in advance to adjust the magnitude and direction of magnetization of the wire rope W. As shown in FIG. 4, the magnetization unit 40 applies a magnetic field to the wire rope W, which is the object to be inspected, in advance from a direction intersecting the longitudinal direction of the wire rope (the direction in which the wire rope W extends). , is configured to adjust the magnitude and direction of magnetization of the wire rope W (magnetization adjustment). Moreover, the magnetism adjusting section 40 includes magnets 40a and 40b.

When the wire rope W moves in the Z1 direction, the wire rope is Before W enters the detection coil 10 (first detection coil 11 and second detection coil 12), a magnetic field is applied to the wire rope W in advance, and the magnitude and direction of magnetization of the wire rope W is determined. is arranged (magnetized). The magnetism adjustment unit 40 is configured to apply a magnetic field in advance from the Y direction that is orthogonal to the Z direction in which the wire rope W extends (the longitudinal direction of the wire rope W) and the X direction in which the plurality of wire ropes W are adjacent to each other. There is. Although FIG. 4 shows an example in which the N poles of the magnets 40a and 40b are arranged to face each other, it is also possible to arrange the S poles of the magnets 40a and 40b to face each other. good. Moreover, the magnetism adjusting section 40 may have a configuration in which only one of the magnets 40a and 40b is provided.

(Configuration regarding excitation coil and detection coil)
As shown in FIG. 4, the detection coil 10 is arranged inside the excitation coil 20 near the center of the excitation coil 20 in the Z direction. Further, the wire rope W passes inside (inside) the detection coil 10 and the excitation coil 20, as shown in FIG. The excitation coil 20 is provided so as to surround the plurality of wire ropes W. That is, the excitation coil 20 is provided in common for the plurality of wire ropes W, and is configured to simultaneously excite the magnetization state of the plurality of wire ropes W.

Specifically, when a current is passed through the excitation coil 20, a magnetic field (magnetic flux) generated based on the current passed through the excitation coil 20 is generated periodically with respect to the plurality of wire ropes W inside the excitation coil 20. is applied to That is, the detection coil 10 (the first detection coil 11 and the second detection coil 12) detects changes in the magnetic flux of the wire rope W to which the magnetic field is applied by the excitation coil 20 while moving relative to the wire rope W. It is configured to detect (measure). Further, the excitation coil 20 is also provided in common to each of the plurality of detection coils 10. Further, the circuit board 30 is provided outside the detection coil 10 and the excitation coil 20 (on the Y1 direction side).

In addition, the detection coil 10 includes a first detection coil 11 disposed on one side of the wire rope W (Y1 direction side) and a second detection coil 11 disposed on the other side of the wire rope W (Y2 direction side) in the Y direction. and a detection coil 12. That is, the first detection coil 11 and the second detection coil 12 are arranged so as to sandwich the wire rope W between them.

The detection coil 10 is supported by a support portion 51 of a coil moving mechanism 50. The support section 51 includes a first support section 51 a that supports the first detection coil 11 and a second support section 51 b that supports the second detection coil 12 .

The inspection device main body 101 moves the first support section 51a in the Y direction (Y1 direction or Y2 direction) using the drive section 52, thereby aligning the center of the detection coil 10 in the Y direction (the center Wa of the wire rope W) with the first support section 51a in the Y direction (Y1 direction or Y2 direction). It is configured such that the separation distance C1 (see FIG. 5) between the first detection coil 11 and the first detection coil 11 can be changed (adjusted). In addition, the inspection device main body 101 moves the second support section 51b in the Y direction (Y1 direction or Y2 direction) by the drive section 52, thereby moving the center of the detection coil 10 in the Y direction (the center Wa of the wire rope W). ) and the second detection coil 12 (see FIG. 5) can be changed (adjusted).

When inspecting the wire rope W, the drive section 52 moves the support section 51 (detection coil 10) under the control of the control section 31 so that the separation distances C1 and C2 are approximately equal. Note that the movement of the support section 51 (detection coil 10) by the drive section 52 may be controlled by the user's hands (manually).

When inspecting the wire rope W, the inspection device main body 101 moves the detection coil 10 (the first detection coil 11 and the second detection coil 12) to the wire rope by bringing the support section 51 close to the wire rope W using the driving section 52. Close to W. Note that when inspecting the wire rope W, the moving speed of the wire rope W (elevator 900) is made slower than when the elevator 900 is normally operating.

Since the moving speed of the wire rope W (elevator 900) is faster than when inspecting the wire rope W, the vibration width of the wire rope W during normal operation of the elevator 900 is also lower than when inspecting the wire rope W. also becomes larger. Therefore, as shown in FIG. The first detection coil 11 and the second detection coil 12) are separated from the wire rope W. Thereby, the inspection device main body 101 can prevent the vibrated wire rope W from coming into contact with the support part 51 (detection coil 10) even during normal operation of the elevator 900 (other than when inspecting the wire rope W). can. As a result, the wire rope inspection device 100 eliminates the need to remove the inspection device main body 101 from the wire rope W during normal operation of the elevator 900 (other than when inspecting the wire rope W). However, it is possible to permanently install the inspection device main body 101.

Note that if the sensitivities (detection characteristics) of the first detection coil 11 and the second detection coil 12 as sensors are the same, even if the wire rope W vibrates, the detection of each of the first detection coil 11 and the second detection coil 12 will be The value obtained by summing (adding) the signals remains constant. Therefore, if the sensitivities (detection characteristics) of the first detection coil 11 and the second detection coil 12 as sensors are made equal, and the detection signals of each of the first detection coil 11 and the second detection coil 12 are accurately summed (added), , noise caused by vibrations of the wire rope W (position of the wire rope W) can be removed (cancelled).

As shown in FIGS. 5 and 6, each of the first detection coil 11 and the second detection coil 12 has a convex shape in a direction away from the wire rope W when viewed from the Z direction (Z1 direction side or Z2 direction side). They are arranged (formed) in a U-shape (saddle shape). The first detection coil 11 and the second detection coil 12 are formed of flexible members. For example, the first detection coil 11 and the second detection coil 12 are formed of conductive patterns of FPC (Flexible Printed Circuits). Note that each of the first detection coil 11 and the second detection coil 12 is arranged in a semicircular shape convex in the direction away from the wire rope W when viewed from the Z direction (Z1 direction side or Z2 direction side). (formation). Further, the detection coil 10 including the first detection coil 11 and the second detection coil 12 may be arranged (formed) in a rectangular shape when viewed from the Z direction (Z1 direction side or Z2 direction side).

As shown in FIGS. 7 and 8, the detection coil 10 (the first detection coil 11 and the second detection coil 12) is arranged in the radial direction of the wire rope W (the direction perpendicular to the longitudinal direction of the wire rope W). Detects changes in excitation magnetic flux. As shown in FIG. 8, when a defect 200 exists in the wire rope W, the excitation magnetic flux is deformed due to the defect 200, so that the magnetic flux passing through the inside of the wire rope W changes. The detection coil 10 detects such a change in magnetic flux and outputs the change in magnetic flux caused by the defect 200 as a detection signal.

(Processing by the processing unit)
In this embodiment, as shown in FIG. 9, the processing unit 122 performs an integral process on the detection signal acquired by the detection coil 10, thereby converting a signal waveform 71 into a signal integral waveform 72. Then, by integrating the detection signal acquired by the detection coil 10, a change in the magnetic flux passing through the inside of the wire rope W caused by the defect 200 appears as a peak in the signal integration waveform 72. In addition, when acquiring the signal integral waveform 72, the processing unit 122 performs processing on the integral value of the value based on the detection signal of the detection coil 10, such as the detection signal value of the detection coil 10 or the detection signal value after noise processing. It is configured to divide the detection signal acquired by the detection coil 10 by the sampling frequency (sampling frequency). For example, when the sampling frequency is 1 kHz (1000 times), the processing unit 122 divides the integral value of the value based on the detection signal of the detection coil 10 by 1000. Further, when the sampling frequency is 100 Hz (100 times), the processing unit 122 divides the integral value of the value based on the detection signal of the detection coil 10 by 100. In addition, the processing unit 122 calculates difference data between the detection signal (signal waveform 71) of the detection coil 10 at the time of the past inspection and the detection signal (signal waveform 71) of the detection coil 10 at the time of the current inspection, The signal integral waveform 72 may be obtained based on the calculated difference data. That is, the processing unit 122 may acquire the signal integral waveform 72 based on the history difference. In this case, the processing unit 122 can remove changes in magnetic flux (noise) caused by the wire rope W itself when acquiring the signal integral waveform 72.

Furthermore, in the present embodiment, when acquiring the signal integral waveform 72, the processing unit 122 subtracts the value based on the detection signal of the detection coil 10 by an approximation line of the value based on the detection signal of the detection coil 10. , so that the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 is corrected to be flat. For example, after the detection of changes in magnetic flux in the inspection area of the wire rope W (inspection of the wire rope W) is completed (post-processing), the processing unit 122 determines the reference value (ground) of the detection signal as shown in FIG. By subtracting the signal waveform 71a, which is tilted upward to the right due to an increase in the signal level), using the approximate straight line 73, the signal waveform 71a is corrected so that the slope of the entire waveform becomes flat. It is converted into a waveform 71b. Then, the processing unit 122 converts the corrected signal waveform 71b into a signal integral waveform 72 by integral processing. That is, in this embodiment, the signal integral waveform 72 is acquired after the detection of the change in magnetic flux in the inspection area of the wire rope W is completed (post-processing). Note that the approximate straight line 73 is an example of an "approximate line" in the claims.

In this embodiment, the processing unit 122 acquires the peak portion of the signal integral waveform 72 as the occurrence portion of the defect 200 in the wire rope W, and the defect information 81 (wire rope It is configured to output information based on the size of the defect 200 in W.

In the present embodiment, the processing unit 122 determines the amount of change in the cross-sectional area of the wire rope W due to the defect 200 of the wire rope W as the size of the defect 200 based on the height of the peak of the signal integral waveform 72. is configured to obtain.

FIG. 11 shows a plurality of signal integral waveforms 72 (signal integral waveforms A1, A2, A3, and A4) when a location where a change in magnetic flux occurs due to the defect 200 is detected. Note that the vertical axis in FIG. 11 is the integral value of each of the signal integral waveforms A1 to A4, and the horizontal axis is the moving distance of the wire rope W (inspection position on the wire rope W). Signal integral waveforms A1 to A4 are signal integrals obtained when inspecting a portion where the cross-sectional area is larger than the normal portion (portion where defect 200 occurs) due to foreign matter attached to the wire rope W. This is waveform 72. In addition, the signal integral waveforms A1, A2, A3, and A4 have their cross-sectional areas changed by amounts S1, S2, S3, and S4, respectively (see FIG. ) changes in the magnetic flux due to the increase are expressed as integral peak heights H1, H2, H3, and H4, respectively. That is, the integral peak heights H1, H2, H3, and H4 are the peak heights of the portions corresponding to the portions (defects 200) where the cross-sectional area of the wire rope W increases by the amount of change S1, S2, S3, and S4, respectively. It shows. Further, the values of the integral peak heights H1, H2, H3, and H4 are, for example, average values of integral values within a predetermined section including the vicinity of the center of each peak. Note that the integral peak heights H1, H2, H3, and H4 are examples of "peak heights of signal integral waveforms" in the claims. Further, the amounts of change S1, S2, S3, and S4 increase in this order.

As shown in FIG. 12, the integral peak heights H1, H2, H3, and H4 of the signal integral waveforms A1, A2, A3, and A4 vary depending on the increase in the cross-sectional area of the wire rope W detected during each inspection. It is increasing accordingly. That is, a proportional relationship can be seen between the amount of change S1 to S4 in the cross-sectional area of the wire rope W and the integral peak heights H1 to H4 of the signal integral waveform 72.

The processing unit 122 acquires the integral peak height of the signal integral waveform 72 and calculates the value of the wire rope W from the acquired integral peak height of the signal integral waveform 72 based on the correlation (proportional relationship) as described above. The amount of change in the cross-sectional area of the wire rope W due to the defect 200 in the wire rope W is obtained as the size of the defect 200 in the cross-sectional direction. That is, the processing unit 122 obtains the size of the defect 200 in the cross-sectional direction of the wire rope W based on the integral peak height of the signal integral waveform 72 that changes in proportion to the amount of change in the cross-sectional area.

Furthermore, in the present embodiment, the processing unit 122 determines the size of the defect 200 in the longitudinal direction (Z direction) of the defect 200.

FIG. 13 shows a plurality of signal integral waveforms 72 (signal integral waveforms B1, B2, B3, and B4) when a location where a change in magnetic flux occurs due to the defect 200 is detected. Note that the vertical axis in FIG. 13 is the integral value of each of the signal integral waveforms B1 to B4, and the horizontal axis is the moving distance of the wire rope W (inspection position on the wire rope W). Signal integral waveforms B1 to B4 are signal integral waveforms 72 obtained when inspecting a portion whose cross-sectional area is smaller than a normal portion due to a wire breakage occurring in the wire rope W. Further, in each of the signal integral waveforms B1 to B4, a change in magnetic flux due to a decrease in the cross-sectional area due to a defect 200 such as a wire breakage appears as a convex peak in the negative direction. Note that the length in the longitudinal direction of the defect 200 detected in each of the signal integral waveforms B1 to B4 increases in the order of the signal integral waveforms B1, B2, B3, and B4.

The intervals P1, P2, P3, and P4 between the rising inflection point and the falling inflection point of each peak (integral peak) of the signal integral waveforms B1, B2, B3, and B4 are the long length of the defect 200. It changes depending on the length in the direction. Specifically, the intervals P1, P2, P3, and P4 increase in this order.

FIG. 14 shows a plurality of signal integral waveforms 72 (signal integral waveforms B5, B6, B7, and B8) when a location where a change in magnetic flux occurs due to the defect 200 is detected. Note that the vertical axis in FIG. 14 is the integral value of each of the signal integral waveforms B5 to B8, and the horizontal axis is the moving distance of the wire rope W (inspection position on the wire rope W). Signal integral waveforms B5 to B8 are signal integral waveforms 72 obtained when inspecting a portion where the cross-sectional area is larger than the normal portion due to foreign matter attached to the wire rope W. Furthermore, in each of the signal integral waveforms B5 to B8, a change in magnetic flux due to an increase in cross-sectional area due to a defect 200 such as foreign matter adhesion appears as a peak convex in the positive direction. Note that the length in the longitudinal direction of the defect 200 detected in each of the signal integral waveforms B5 to B8 increases in the order of the signal integral waveforms B5, B6, B7, and B8.

The intervals P5, P6, P7, and P8 between the rising inflection point and the falling inflection point of the respective peaks (integral peaks) of the signal integral waveforms B5, B6, B7, and B8 are the long length of the defect 200. It changes depending on the length in the direction. Specifically, the intervals P5, P6, P7, and P8 increase in this order.

As shown in FIG. 15, there is a difference between the intervals (intervals P1 to P8) between the inflection points at the peaks (integral peaks) of the signal integral waveforms B1 to B8 and the length of the defect 200 in the longitudinal direction. , and the lengths L3 to -L3 shown on the vertical and horizontal axes, there is a correlation. The intervals (intervals P1 to P8) between the inflection points at the peaks of each of the signal integral waveforms B1 to B8 are approximately the same as the length in the longitudinal direction of the defect 200 detected during each inspection.

The processing unit 122 obtains the interval between the rising inflection point and the falling inflection point of the peak (integral peak) of the signal integral waveform 72, and calculates the above-mentioned interval from the obtained interval of the inflection points. Based on the correlation, the length of the defect 200 in the wire rope W in the longitudinal direction is obtained. Specifically, the processing unit 122 obtains the interval between the inflection points at each peak of the signal integral waveform 72 as the size (length) in the longitudinal direction of the defect 200 in the wire rope W.

As shown in FIG. 16, in the wire rope inspection apparatus 100, the display unit 124 displays the lengths L4 and L5 of the defect 200 in the longitudinal direction of the wire rope W and the cross section of the wire rope W as defect information 81. The size of the defect 200 in the direction (cross-sectional area changes S5 and S6) is displayed in correspondence with the signal integral waveform 72. By visually recognizing the signal integral waveform 72, the user can easily understand the range and shape of the defect 200 (changes in magnetic flux caused by the defect 200). By viewing the defect information 81, the user can easily grasp the length of the defect 200 in the longitudinal direction of the wire rope W and the size of the defect 200 in the cross-sectional direction of the wire rope W. . Furthermore, in the present embodiment, the display unit 124 is configured to display position information in the longitudinal direction of the wire rope W in association with information based on the size of the defect 200 in the wire rope W. Specifically, the defect information 81 displayed on the display unit 124 includes movement distances D1 to D7 of the wire rope W during the inspection (inspection position on the wire rope W) as position information in the longitudinal direction of the wire rope W. is associated with the signal integral waveform 72. In FIG. 16, the cross-sectional area of the portion where the defect 200 occurs whose inspection position is at the moving distance D2 of the wire rope W has increased by the amount of change S5, so the defect information 81 shows the size of the defect 200. It is indicated as "S5". In addition, the cross-sectional area of the defect 200 occurring portion whose inspection position is at the moving distance D6 of the wire rope W has decreased by the amount of change S6, so the defect information 81 indicates that the size of the defect 200 is "-" S6". Note that the display unit 124 may display a threshold line that the processing unit 122 detects as the defect 200 superimposed on the signal integral waveform 72.

(Processing flow in wire rope inspection)
Next, an example of a processing flow for acquiring defect information 81 (wire rope W inspection method) using the wire rope inspection apparatus 100 according to the present embodiment will be described with reference to FIG. 17.

In step 901, the magnetic flux of the wire rope W is detected. In step 901, the excitation coil 20 detects a change in the magnetic flux of the wire rope W while moving the detection coil 10 relative to the wire rope W whose magnetization state is excited. Note that step 901 is an example of a "detection step" in the claims. After step 901 is completed, the process moves to step 902.

In step 902, the size of the defect 200 in the wire rope W is obtained. In step 902, the size of the defect 200 in the wire rope W is obtained based on the signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal detected in step 901. Note that step 902 is an example of an "obtaining step" in the claims. After completion of step 902, the process moves to step 903.

In this embodiment, in step 902, the peak portion of the signal integral waveform 72 is acquired as the portion where the defect 200 occurs in the wire rope W. Specifically, based on the height of the peak of the signal integral waveform 72, the amount of change in the cross-sectional area of the wire rope W due to the defect 200 of the wire rope W is obtained as the size of the defect 200. Furthermore, the length of the defect 200 in the longitudinal direction of the wire rope W is obtained as the size of the defect 200 based on the interval between the rising inflection point and the falling inflection point of the peak in the signal integral waveform 72. be done.

In step 903, defect information 81 is output. In step 903, defect information 81 based on the size of the defect 200 in the wire rope W acquired in step 902 is output. Note that step 903 is an example of an "output step" in the claims. After completion of step 903, the process moves to step 904.

In step 904, defect information 81 is displayed. In step 904, the defect information 81 output in step 903 is displayed on the display section 124.

(Effects of this embodiment)
In this embodiment, the following effects can be obtained.

In this embodiment, the size of the defect 200 in the wire rope W is acquired based on the signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. Thereby, the size of the defect 200 in the wire rope W can be quantitatively acquired from the size of the defect 200 in the wire rope W acquired based on the signal integral waveform 72.

In addition, the wire rope inspection device 100 and the wire rope inspection method according to the above embodiments are configured as follows, so that the following additional effects can be obtained.

In the wire rope inspection device 100 and the wire rope inspection method of this embodiment, the peak portion of the signal integral waveform 72 is acquired as the occurrence portion of the defect 200 in the wire rope W, and the defect is determined based on the peak portion of the acquired signal integral waveform 72. Information 81 (information based on the size of the defect 200 in the wire rope W) is output. Thereby, the user can grasp the size of the defect 200 in the wire rope W from the defect information 81 based on the peak portion of the signal integral waveform 72 output by the processing unit 122.

In addition, in the wire rope inspection apparatus 100 and the wire rope inspection method of the present embodiment, the size of the defect 200 of the wire rope W is determined based on the height of the peak (integral peak height) of the signal integral waveform 72. The amount of change in the cross-sectional area of the wire rope W due to is obtained. As a result, defect information 81 (information based on the size of the defect 200 in the wire rope W) including the amount of change in the cross-sectional area of the wire rope W due to the defect 200 in the wire rope W as the size of the defect 200 is obtained. Ru. As a result, the user can grasp the amount of change in the cross-sectional area of the wire rope W due to the defect 200 from the defect information 81. The size of the defect 200 in the direction) can be grasped.

Furthermore, in the wire rope inspection apparatus 100 and the wire rope inspection method of the present embodiment, the size of the defect 200 is determined based on the interval between the rise and fall of the peak (integral peak) of the signal integral waveform 72. The length of the defect 200 in the longitudinal direction (Z direction) is obtained. As a result, defect information 81 (information based on the size of the defect 200 in the wire rope W) including the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W as the size of the defect 200 is acquired. . As a result, the user can grasp the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W based on the defect information 81.

Furthermore, in this embodiment, the display unit 124 is configured to display defect information 81 (information based on the size of the defect 200 in the wire rope W). Thereby, the user can easily visually grasp the size of the defect 200 in the wire rope W by viewing the defect information 81 displayed on the display unit 124.

Further, in the present embodiment, the display unit 124 displays position information in the longitudinal direction (Z direction) of the wire rope W in association with defect information 81 (information based on the size of the defect 200 in the wire rope W). It is configured as follows. Thereby, the user can easily visually grasp the position of the defect 200 in the longitudinal direction (Z direction) of the wire rope W at the same time as the size of the defect 200 in the wire rope W.

In the present embodiment, when acquiring the signal integral waveform 72, the processing unit 122 calculates the sampling frequency of the detection signal acquired by the detection coil 10 with respect to the integral value of the value based on the detection signal of the detection coil 10. It is configured to perform division by . As a result, even when a change in the magnetic flux of the wire rope W is detected using a different sampling frequency, division by the sampling frequency is performed, so that fluctuations in the peak size of the signal integral waveform 72 due to the difference in sampling frequency can be suppressed. I can do it. As a result, the size of the defect 200 in the wire rope W can be appropriately acquired even when the sampling frequency at the time of inspection is different.

Furthermore, in the present embodiment, when acquiring the signal integral waveform 72, the processing unit 122 converts the value based on the detection signal of the detection coil 10 into an approximate line (approximate straight line 73) of the value based on the detection signal of the detection coil 10. By subtracting , the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 is corrected to be flat. As a result, when the detection coil 10 detects the detection signal, the reference value (ground level) of the detection signal gradually increases, so that the entire signal waveform 71 changes regardless of the presence or absence of the defect 200 in the wire rope W. Even if the value of the detection signal gradually increases in a sloped manner, the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 can be corrected to become flat. As a result, regardless of the presence or absence of the defect 200 in the wire rope W, it is possible to prevent the signal integral waveform 72 obtained by integrating the signal waveform 71 from changing. Thereby, erroneous detection of the defect 200 based on the signal integral waveform 72 can be prevented.

[Modified example]
Note that the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and further includes all changes (modifications) within the meaning and range equivalent to the claims.

For example, in the embodiment described above, the processing unit 122 of the processing terminal 102 provided separately from the inspection apparatus main body 101 performs an integral process on the signal waveform 71 based on the detection signal of the detection coil 10 based on the signal integral waveform 72. , an example of acquiring the size of the defect 200 in the wire rope W has been shown, but the present invention is not limited to this. In the present invention, the control unit 31 (see FIG. 2) of the inspection device main body 101 determines the size of the defect 200 in the wire rope W based on the signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. You may also obtain In this case, the control unit 31 is an example of a “processing unit” in the claims. Further, in the present invention, a processing device such as a server that is communicatively connected to the wire rope inspection device determines the size of the defect in the wire rope based on a signal integral waveform obtained by integrating the signal waveform based on the detection signal of the detection coil. You may also obtain

In the above embodiment, the size of the defect 200 is the amount of change in the cross-sectional area of the wire rope W due to the defect 200 of the wire rope W, and the amount of change in the cross-sectional area of the wire rope W due to the defect 200, and the amount of change of the defect 200 in the longitudinal direction (Z direction) of the wire rope W. Although an example in which the length is obtained has been shown, the present invention is not limited to this. In the present invention, only one of the amount of change in the cross-sectional area of the wire rope due to the defect in the wire rope and the length of the defect in the longitudinal direction of the wire rope may be obtained as the size of the defect. .

Further, in the above embodiment, an example was shown in which the display section 124 displays the defect information 81 including the signal integral waveform 72 as information based on the size of the defect 200 in the wire rope W (see FIG. 16). The invention is not limited to this. In the present invention, as in a modification shown in FIG. 18, the display section 124 may display defect information 82 that does not include the signal integral waveform as information based on the size of the defect 200 in the wire rope. The defect information 82 displays the position of the defect in the longitudinal direction of the wire rope and the type of the defect. Further, in the present invention, the display section 124 may be configured to be able to switch the information to be displayed between the defect information 81 and the defect information 82. Further, in the present invention, the position and size of the defect may be displayed numerically as information based on the size of the defect in the wire rope.

Further, in the embodiment described above, the display unit 124 displays the position information in the longitudinal direction (Z direction) of the wire rope W in association with the defect information 81 (information based on the size of the defect 200 in the wire rope W). Although an example of such a configuration has been shown, the present invention is not limited to this. In the present invention, only the position and size of the defect detected in the inspection area may be displayed on the display section.

In the embodiment described above, when acquiring the signal integral waveform 72, the processing unit 122 calculates the sampling frequency of the detection signal acquired by the detection coil 10 with respect to the integral value of the value based on the detection signal of the detection coil 10. Although an example is shown in which the structure is configured to perform division by , the present invention is not limited to this. In the present invention, when acquiring a signal integral waveform, the integral value of the value based on the detection signal of the detection coil does not need to be divided by the sampling frequency of the detection signal acquired by the detection coil. For example, the detection signal may be obtained at the same sampling frequency during all inspections, and the signal integral waveform may be obtained without performing division by the sampling frequency.

Further, in the embodiment described above, when the processing unit 122 acquires the signal integral waveform 72 after the detection of the change in magnetic flux in the inspection area of the wire rope W is completed (post-processing), the detection signal of the detection coil 10 is By subtracting the value based on the value based on the detection signal of the detection coil 10 by the approximate line (approximate straight line 73) of the value based on the detection signal of the detection coil 10, the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 is corrected to be flat. Although an example configured as follows is shown, the present invention is not limited to this. In the present invention, when acquiring a signal integral waveform in real time while detecting a change in magnetic flux in an inspection area of a wire rope, the processing unit converts a value based on a detection signal of the detection coil to a value based on the detection signal of the detection coil. By subtracting the average value of the values, correction may be performed so that the slope of the entire signal waveform based on the detection signal of the detection coil becomes flat. This also makes it possible to suppress changes in the signal integral waveform obtained by integrating the signal waveform, regardless of the presence or absence of a defect in the wire rope. As a result, it is possible to prevent erroneous detection of defects based on the signal integral waveform.

Further, in the embodiment described above, when acquiring the signal integral waveform 72, the processing unit 122 subtracts the value based on the detection signal of the detection coil 10 by the approximate straight line 73 of the value based on the detection signal of the detection coil 10. Although an example is shown in which the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 is corrected to be flat, the present invention is not limited to this. In the present invention, when acquiring the signal integral waveform, the processing section subtracts the value based on the detection signal of the detection coil by an approximate curve of the value based on the detection signal of the detection coil, thereby adding the value to the detection signal of the detection coil. Correction may be performed so that the slope of the entire signal waveform based on the signal waveform is flat. In this case, the approximate curve is an example of an "approximate line" in the claims.

Further, in the above embodiment, the detection coil 10 includes the first detection coil 11 and the second detection coil 12 that are arranged to sandwich the wire rope W between them, but the present invention is not limited to this. . In the present invention, the detection coil may be a coil wound along the circumferential direction of the wire rope. Further, the detection coil may be arranged only in a part of the wire rope in the circumferential direction without surrounding the wire rope, and may detect only a part of the leakage magnetic flux of the wire rope. That is, in the present invention, the detection of changes in the magnetic flux of the wire rope by the detection coil is not limited to detection using the total magnetic flux method.

Further, in the above embodiment, for convenience of explanation, the process at the time of acquiring the defect information 81 of the present invention (at the time of inspecting the wire rope W) was explained using a flow-driven flowchart in which the process is performed in order along the process flow. However, the present invention is not limited thereto. In the present invention, the processing operation may be performed by event-driven processing in which processing is executed on an event-by-event basis. In this case, it may be completely event-driven, or it may be a combination of event-driven and flow-driven.

Further, in the above embodiment, an example was shown in which the wire rope W used in the elevator 900 is inspected, but the present invention is not limited to this. The present invention may be a wire rope inspection device and a wire rope method for inspecting wire ropes used in cranes, ropeways, suspension bridges, robots, and the like. In addition, when the wire rope itself does not move, such as the wire rope used for suspension bridges, the wire rope inspection device measures the magnetic flux of the wire rope while moving the detection coil of the wire rope inspection device along the wire rope. All it takes is measurement.

[Mode]
It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

(Item 1)
a detection coil that detects changes in magnetic flux of the wire rope while moving relative to the wire rope;
A wire rope inspection device, comprising: a processing unit that obtains the size of a defect in the wire rope based on a signal integral waveform obtained by performing integral processing on a signal waveform based on a detection signal of the detection coil.

(Item 2)
The processing unit acquires a peak portion of the signal integral waveform as a portion where the defect occurs in the wire rope, and determines the size of the defect in the wire rope based on the acquired peak portion of the signal integral waveform. The wire rope inspection device according to item 1, configured to output information.

(Item 3)
The processing unit is configured to obtain, as the size of the defect, an amount of change in the cross-sectional area of the wire rope due to the defect in the wire rope, based on the height of a peak of the signal integral waveform. The wire rope inspection device according to item 1 or 2.

(Item 4)
The processing unit is configured to obtain the length of the defect in the longitudinal direction of the wire rope as the size of the defect based on an interval between a rise and a fall of a peak of the signal integral waveform. The wire rope inspection device according to any one of items 1 to 3.

(Item 5)
The wire rope inspection device according to any one of items 1 to 4, further comprising a display unit that displays information based on the size of the defect in the wire rope.

(Item 6)
The wire rope inspection device according to item 5, wherein the display unit is configured to display position information in the longitudinal direction of the wire rope in association with information based on the size of the defect in the wire rope. .

(Item 7)
The processing unit is configured to divide an integral value of a value based on the detection signal of the detection coil by a sampling frequency of the detection signal obtained by the detection coil when obtaining the signal integral waveform. The wire rope inspection device according to any one of items 1 to 6, wherein

(Item 8)
When acquiring the signal integral waveform, the processing unit subtracts a value based on the detection signal of the detection coil by an average value or an approximation line of the value based on the detection signal of the detection coil. The wire rope inspection device according to any one of items 1 to 7, wherein the wire rope inspection device is configured to correct the slope of the entire signal waveform based on the detection signal to become flat.

(Item 9)
a detection step of detecting a change in the magnetic flux of the wire rope;
A wire rope inspection method, comprising: an obtaining step of obtaining a size of a defect in the wire rope based on a signal integrated waveform obtained by integrating a signal waveform based on a detection signal detected in the detecting step.

(Item 10)
The obtaining step includes obtaining a peak portion of the signal integral waveform as a portion where the defect occurs in the wire rope,
The wire rope inspection method according to item 9, further comprising an output step of outputting information based on the size of the defect in the wire rope that is based on the size of the defect in the wire rope acquired in the acquisition step.

(Item 11)
The obtaining step includes obtaining, as the size of the defect, an amount of change in the cross-sectional area of the wire rope due to the defect in the wire rope, based on the height of the peak of the signal integral waveform. The wire rope inspection method according to item 9 or 10.

(Item 12)
The obtaining step includes obtaining the length of the defect in the longitudinal direction of the wire rope as the defect size based on the interval between the rising and falling peaks of the signal integral waveform. The wire rope inspection method according to any one of items 9 to 11.

10 Detection coil 71, 71a, 71b Signal waveform 72, A1 to A4, B1 to B8 Signal integral waveform 73 Approximate straight line (approximate line)
81, 82 Defect information (information based on the size of defects in wire rope)
100 Wire rope inspection device 122 Processing section 124 Display section 200 Defects H1 to H4 Integral peak height (peak height of signal integrated waveform)
L4, L5 (Defect) length P1~P8 Interval S1~S6 Amount of change W Wire rope

Claims (12)

a detection coil that detects changes in magnetic flux of the wire rope while moving relative to the wire rope;
A wire rope inspection device, comprising: a processing unit that obtains the size of a defect in the wire rope based on a signal integral waveform obtained by performing integral processing on a signal waveform based on a detection signal of the detection coil. The processing unit acquires a peak portion of the signal integral waveform as a portion where the defect occurs in the wire rope, and determines the size of the defect in the wire rope based on the acquired peak portion of the signal integral waveform. The wire rope inspection device according to claim 1, configured to output information. The processing unit is configured to obtain, as the size of the defect, an amount of change in the cross-sectional area of the wire rope due to the defect in the wire rope, based on the height of a peak of the signal integral waveform. The wire rope inspection device according to claim 1 or 2. The processing unit is configured to obtain the length of the defect in the longitudinal direction of the wire rope as the size of the defect based on an interval between a rise and a fall of a peak of the signal integral waveform. The wire rope inspection device according to any one of claims 1 to 3. The wire rope inspection device according to any one of claims 1 to 4, further comprising a display unit that displays information based on the size of the defect in the wire rope. The wire rope inspection according to claim 5, wherein the display unit is configured to display position information in the longitudinal direction of the wire rope in association with information based on the size of the defect in the wire rope. Device. The processing unit is configured to divide an integral value of a value based on the detection signal of the detection coil by a sampling frequency of the detection signal obtained by the detection coil when obtaining the signal integral waveform. The wire rope inspection device according to any one of claims 1 to 6, wherein the wire rope inspection device is When acquiring the signal integral waveform, the processing unit subtracts a value based on the detection signal of the detection coil by an average value or an approximation line of the value based on the detection signal of the detection coil. The wire rope inspection device according to any one of claims 1 to 7, wherein the wire rope inspection device is configured to correct the slope of the entire signal waveform based on the detection signal to become flat. a detection step of detecting a change in the magnetic flux of the wire rope;
A wire rope inspection method, comprising: an obtaining step of obtaining a size of a defect in the wire rope based on a signal integrated waveform obtained by integrating a signal waveform based on a detection signal detected in the detecting step. The obtaining step includes obtaining a peak portion of the signal integral waveform as a portion where the defect occurs in the wire rope,
The wire rope inspection method according to claim 9, further comprising an output step of outputting information based on the size of the defect in the wire rope that is based on the size of the defect in the wire rope acquired in the acquisition step. The obtaining step includes obtaining, as the size of the defect, an amount of change in the cross-sectional area of the wire rope due to the defect in the wire rope, based on the height of the peak of the signal integral waveform. The wire rope inspection method according to claim 9 or 10. The obtaining step includes obtaining the length of the defect in the longitudinal direction of the wire rope as the defect size based on the interval between the rising and falling peaks of the signal integral waveform. The wire rope inspection method according to any one of claims 9 to 11.

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