Wire rope inspection device and wire rope inspection method

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

Technical Field

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[0001] The present invention relates to a wire rope inspection device and a wire rope inspection method.

Background Art

[0002] Conventionally, a magnetic inspection device for inspecting a wire rope has been known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a magnetic inspection device that detects the magnetic flux of a wire rope and inspects the wire rope. This magnetic inspection device integrates the measured waveform obtained by detecting the magnetic flux of the wire rope and converts it into an integrated waveform that makes it easier to grasp the state of the wire rope (defect state) than the measured waveform. Then, the presence or absence of defects in the wire rope can be obtained from the integrated waveform converted by the magnetic inspection device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the magnetic inspection device described in Patent Document 1, while it is possible to obtain the presence or absence of defects in the wire rope, it is not possible to obtain the size of the defects that have occurred in the wire rope. Therefore, there is a need for a wire rope inspection device and a wire rope inspection method capable of quantitatively obtaining the size of defects in the wire rope.

[0006] <O000031>This invention has been made to solve the above problems, and one object of this invention is to provide a wire rope inspection device and a wire rope inspection method capable of quantitatively obtaining the size of defects in the wire rope. [Means for solving the problem]

[0007] In the first aspect of this invention, the wire rope inspection device includes a detection coil that detects changes in the magnetic flux of the wire rope while moving relative to the wire rope, and a signal integral waveform obtained by integrating the signal waveform based on the detection signal of the detection coil. The rise and fall at the peak The system includes a processing unit that obtains the size of a defect in the wire rope based on the above.

[0008] The wire rope inspection method in the second aspect of this invention includes a detection step of detecting a change in the magnetic flux of a wire rope while moving relative to the wire rope, and a signal integrated waveform obtained by integrating the signal waveform based on the detection signal detected in the detection step. The rise and fall at the peak The system comprises an acquisition step of obtaining the size of a defect in the wire rope based on the above. [Effects of the Invention]

[0009] Here, the inventor focused on the integrated signal waveform obtained by integrating the signal waveform based on the detection signal of a detection coil that detects changes in the magnetic flux of a wire rope. As a result of diligent research by the inventor, the inventor discovered a correlation between the integrated signal waveform obtained by integrating the signal waveform based on the detection signal of the detection coil and the magnitude of defects in the wire rope, leading to the invention of the present invention.

[0010] In other words, according to the wire rope inspection apparatus in the first aspect of the present invention and the wire rope inspection method in the second aspect, the magnitude of defects in the wire rope is obtained based on a signal integral waveform obtained by integrating the signal waveform based on the detection signal of the detection coil. As a result, the magnitude of defects in the wire rope can be quantitatively obtained from the magnitude of defects in the wire rope obtained based on the signal integral waveform. [Brief explanation of the drawing]

[0011] [Figure 1]This is a schematic diagram showing the overall configuration of a wire rope inspection device according to one embodiment of the present invention. [Figure 2] This is a block diagram showing the overall configuration of a wire rope inspection device according to one embodiment of the present invention. [Figure 3] This is a schematic diagram showing the arrangement of the detection coil and excitation coil in the Z direction. [Figure 4] This is a diagram showing the configuration of the magnetic regulating section. [Figure 5] This is a schematic diagram showing the arrangement of the detection coil and excitation coil in a cross-section along the 800-800 line in Figure 3. [Figure 6] This is a schematic diagram showing the arrangement of detection coils during normal elevator operation. [Figure 7] This diagram illustrates the detection of excitation magnetic flux by a detection coil. [Figure 8] This diagram shows the detection of the excitation magnetic flux at the point where a defect occurs by a detection coil. [Figure 9] This figure illustrates the integration process applied to a signal waveform. [Figure 10] This figure illustrates the subtraction process applied to an integrated signal waveform. [Figure 11] This graph shows the signal integral waveform and integral peak height obtained when inspecting the area where a defect occurs. [Figure 12] This graph shows the relationship between the height of the integral peak and the change in cross-sectional area. [Figure 13] This graph shows the signal integral waveform and the inflection point interval of the integral peak obtained when inspecting the area of ​​the wire rope where a defect occurs that reduces the cross-sectional area. [Figure 14] This graph shows the signal integral waveform and the inflection point interval of the integral peak obtained when inspecting the area of ​​the wire rope where a defect occurs that increases the cross-sectional area. [Figure 15] This graph shows the relationship between the inflection point interval of the integral peak and the length of the defect. [Figure 16] This diagram shows an example of defect information displayed on the display unit. [Figure 17]This is a diagram showing an example of a processing flow for obtaining defect information. [Figure 18] This is a diagram showing another example of defect information displayed on a display unit.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments embodying the present invention will be described based on the drawings.

[0013] Referring to FIGS. 1 to 16, the configuration of the wire rope inspection apparatus 100 according to this embodiment will be described. In the following description, "orthogonal" means intersecting at an angle of 90 degrees and in the vicinity of 90 degrees.

[0014] (Configuration of Wire Rope Inspection Apparatus) The wire rope inspection apparatus 100 (see FIG. 1) is an apparatus for inspecting defects 200 (see FIG. 8) such as strand breakage, foreign matter adhesion, and rust on the wire rope W that is the inspection object. The wire rope inspection apparatus 100 analyzes (judges) the state of the wire rope W, such as the presence or absence of defects 200 in the wire rope W, by the total magnetic flux method, and is an apparatus capable of confirming deterioration (abnormality) of the wire rope W that is difficult to visually confirm. When the wire rope W contains a defect 200, the magnetic flux at the occurrence part of the defect 200 is different from that of the normal part. Different from the method of measuring only the leakage magnetic flux from defects 200 on the surface of the wire rope W, the total magnetic flux method is a method capable of measuring defects 200 such as strand breakage and rust inside the wire rope W.

[0015] As shown in Figure 1, the wire rope inspection device 100 comprises 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. The processing terminal 102 is, for example, a tablet device such as a tablet PC (Personal Computer). The processing terminal 102 may also be a smartphone or a notebook PC. The processing terminal 102 is configured to display the measurement results of the magnetic flux of the wire rope W by the inspection device body 101, and the analysis results (inspection results) based on the measurement results of the magnetic flux of the wire rope W by the inspection device body 101, such as defect information 81 (see Figure 16), which will be described later. The defect information 81 is an example of "information based on the size of defects in the wire rope" as defined in the claims.

[0016] The user (worker) can use the wire rope inspection device 100 to inspect the wire rope W, thereby confirming defects 200 (abnormalities) in the wire rope W that are difficult to confirm by visual inspection. Figure 1 shows an example in which the inspection device body 101 inspects the wire rope W used to move the elevator car 901 of the elevator 900.

[0017] The elevator 900 comprises a car 901, a sheave (pulley) 902, a sheave 903, and a wire rope W. The elevator 900 is configured to move the car 901, which carries people and cargo, in the vertical direction by rotating the sheave 902, which is provided on the hoisting machine, to wind up the wire rope W.

[0018] The inspection device body 101 is fixed to the wire rope W so as not to move, and inspects for abnormalities in the wire rope W as it is moved by the sheave 902 of the hoisting machine. In Figure 1, the inspection device body 101 is mounted between the sheave 902 and the sheave 903, but the mounting position of the inspection device body 101 is not limited to this.

[0019] The wire rope W is formed by twisting together multiple strands of wire material and is a magnetic material consisting of a long length extending in the Z direction. Each strand is composed of multiple wires twisted together. To prevent breakage due to deterioration, the wire rope W is inspected by a wire rope inspection device 100 (inspection device body 101). Based on the measurement of the magnetic flux of the wire rope W, any wire rope W that is determined to have exceeded a predetermined standard of deterioration (abnormality) is replaced by the user (worker).

[0020] The inspection device body 101 measures the magnetic flux of the wire rope W while moving relative to the wire rope W along its surface. When the wire rope W itself moves, such as when used in an elevator 900, the inspection device body 101 measures the magnetic flux of the wire rope W while moving the wire rope W (elevator 900) relative to the inspection device body 101. This allows the magnetic flux to be measured at each position in the longitudinal direction (Z direction) of the wire rope W, making it possible to inspect for defects 200 (abnormalities) at each position in the longitudinal direction of the wire rope W.

[0021] (Configuration of the inspection device) As shown in Figure 2, the inspection device 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.

[0022] The detection coil 10 is configured to detect changes in the magnetic flux of the wire rope W while moving relative to the wire rope W. The detection coil 10 also includes a first detection coil 11 and a second detection coil 12.

[0023] The first detection coil 11 and the second detection coil 12 transmit a detection signal (output a voltage) corresponding 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. A detailed explanation of the detection coil 10 (first detection coil 11 and second detection coil 12) will be given later.

[0024] The excitation coil 20 is configured to apply a magnetic field to the wire rope W. Specifically, an alternating current flows through the excitation coil 20, and the periodic flow of this current causes the excitation coil 20 to generate a magnetic field inside (inside the coil), and this periodically generated magnetic field is applied to the wire rope W located inside. In other words, the excitation coil 20 is configured to excite the magnetization state of the wire rope W. Furthermore, the excitation coil 20 is configured to move relative to the wire rope W.

[0025] Furthermore, the circuit board 30 includes a control unit 31, an excitation interface 32, a receiving interface 33, a power supply circuit 34, a storage unit 35, and a communication unit 36. The circuit board 30 is a printed circuit board (PCB) on which wiring patterns are formed using conductors and electronic components are mounted.

[0026] The control unit 31 is configured to control various parts of the inspection device body 101. The control unit 31 includes a processor such as a CPU (Central Processing Unit), memory, an AD converter, and the like.

[0027] The excitation interface 32 receives control signals from the control unit 31. Based on the received control signals, the excitation interface 32 controls the power supply to the excitation coil 20.

[0028] The receiving interface 33 processes the detection signals detected by the detection coils 10 (each of the first detection coil 11 and the second detection coil 12). The receiving interface 33 receives (acquires) the detection signals from the detection coils 10 and transmits them to the control unit 31. The receiving interface 33 includes an amplifier. The receiving interface 33 amplifies the detection signals from the detection coils 10 using the amplifier and transmits them to the control unit 31.

[0029] The power supply circuit 34 receives power from an external source and supplies power to various parts of the inspection device body 101, such as the excitation coil 20. The storage unit 35 is a storage medium, such as flash memory, and stores (saves) information such as the measurement results (measurement data) of the wire rope W. The communication unit 36 ​​is a communication interface that connects the inspection device body 101 and the processing terminal 102 in a communication manner.

[0030] The magnetization unit 40 is configured to adjust the magnetic flux of the wire rope W to which a magnetic field has been applied by the excitation coil 20. The magnetization unit 40 is configured to adjust (magnetize) the direction of magnetization of the wire rope W by applying a magnetic field to the wire rope W. A detailed explanation of the magnetization unit 40 will be given later.

[0031] The coil moving mechanism 50 includes a support section 51 that supports the detection coils 10 (first detection coil 11 and second detection coil 12) and a drive section 52 for moving the support section 51. The drive section 52 includes an actuator, such as a motor (not shown), controlled by the control section 31. The drive section 52 is configured to move the support section 51 under the control of the control section 31. A detailed explanation of the movement of the detection coils 10 by the coil moving mechanism 50 will be given later.

[0032] (Configuration of the processing terminal) The processing terminal 102 of the wire rope inspection device 100 includes a communication unit 121, a processing unit 122, a storage unit 123, and a display unit 124.

[0033] The communication unit 121 is a communication interface that connects the inspection device body 101 and the processing terminal 102 in a communication manner. The processing terminal 102 receives the measurement results of the wire rope W from the inspection device body 101 (data of the detection signal detected by the detection coil 10) via the communication unit 121.

[0034] The processing unit 122 is configured to control various parts of the processing terminal 102. The processing unit 122 includes a processor such as a CPU, memory, and the like. In this embodiment, the processing unit 122 is configured to acquire the magnitude of the defect 200 in the wire rope W based on a signal integral waveform 72 obtained by integrating a signal waveform 71 based on the detection signal of the detection coil 10.

[0035] The storage unit 123 is a storage medium including, for example, flash memory, and stores (saves) data such as the 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.

[0036] 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 accepts touch operations from the user (operator). In this embodiment, the display unit 124 is configured to display defect information 81 (see Figure 16), which will be described later. The wire rope inspection device 100 is also configured so that the user can operate the inspection device body 101 by operating the processing terminal 102.

[0037] Furthermore, as shown in Figure 3, the elevator 900 is equipped with multiple wire ropes W. The multiple wire ropes W are arranged in a direction perpendicular to their respective longitudinal directions (Z direction) (X direction) (parallel to each other). The inspection device body 101 also includes a detection unit 60 equipped with detection coils 10 (first detection coil 11 and second detection coil 12) and an excitation coil 20. The detection unit 60 of the inspection device body 101 is fixed so as not to come into contact with the wire ropes W.

[0038] Furthermore, multiple detection coils 10 are provided to correspond to multiple wire ropes W. That is, the number of detection coils 10 is equal to the number of wire ropes W. For example, if there are 6 wire ropes W, 6 detection coils 10 (first detection coil 11 and second detection coil 12) are provided. The detection coils 10 are configured to move relative to each other along the Z direction in which the multiple wire ropes W extend, and to detect changes in the magnetic flux of the wire ropes W.

[0039] Furthermore, the magnetic regulating unit 40 is provided separately from the detection unit 60. The magnetic regulating unit 40 is also fixed to the detection unit 60 on the Z2 direction side so as not to come into contact with the multiple wire ropes W. Alternatively, the magnetic regulating unit 40 may be provided integrally with the detection unit 60, which contains the detection coil 10 and the excitation coil 20.

[0040] (Configuration of the magnetic shaping section) The magnetization unit 40 is configured to pre-apply a magnetic field to the wire rope W to adjust the magnitude and direction of the magnetization of the wire rope W. As shown in Figure 4, the magnetization unit 40 is configured to pre-apply a magnetic field to the wire rope W, which is the object to be inspected, from a direction intersecting the longitudinal direction of the wire rope (the direction in which the wire rope W extends), to adjust (regulate) the magnitude and direction of the magnetization of the wire rope W. The magnetization unit 40 also includes magnets 40a and 40b.

[0041] When the wire rope W moves in the Z1 direction, a magnetic field is applied to the wire rope W before it enters the detection coil 10 (first detection coil 11 and second detection coil 12) by the magnetization unit 40 (magnets 40a and 40b) located on one side (Z2 direction side) of the wire rope W in the longitudinal direction (Z direction), thereby adjusting the magnitude and direction of the magnetization of the wire rope W (magnetization). The magnetization unit 40 is configured to apply a magnetic field in advance from the Y direction, which is perpendicular to the Z direction (longitudinal direction of the wire rope W) in which the wire rope W extends and the X direction in which multiple wire ropes W are adjacent. In Figure 4, an example is shown in which the north poles of magnets 40a and 40b are arranged facing each other, but they may also be arranged so that the south poles of magnets 40a and 40b face each other. Furthermore, the magnetization unit 40 may be configured with only one of the magnets 40a and 40b.

[0042] (Configuration of excitation coil and detection coil) As shown in Figure 4, the detection coil 10 is located inside the excitation coil 20, near the center of the excitation coil 20 in the Z direction. The wire rope W passes inside the detection coil 10 and the excitation coil 20, as shown in Figure 5. The excitation coil 20 is provided so as to surround multiple wire ropes W. That is, the excitation coil 20 is provided in common for multiple wire ropes W and is configured to simultaneously excite the magnetization state of multiple wire ropes W.

[0043] Specifically, when current flows through the excitation coil 20, a magnetic field (magnetic flux) generated within the excitation coil 20 based on the current flowing through it is periodically applied to the multiple wire ropes W. That is, the detection coils 10 (first detection coil 11 and second detection coil 12) are configured to move relative to the wire ropes W and detect (measure) the change in magnetic flux of the wire ropes W to which the magnetic field is applied by the excitation coil 20. The excitation coil 20 is also provided in common for each of the multiple detection coils 10. The circuit board 30 is provided on the outside (Y1 direction side) of the detection coils 10 and the excitation coils 20.

[0044] Furthermore, the detection coil 10 includes a first detection coil 11 positioned on one side of the wire rope W (Y1 direction side) and a second detection coil 12 positioned on the other side of the wire rope W (Y2 direction side) in the Y direction. That is, the first detection coil 11 and the second detection coil 12 are positioned so as to sandwich the wire rope W from each other.

[0045] The detection coil 10 is supported by a support portion 51 of the coil movement mechanism 50. The support portion 51 includes a first support portion 51a that supports the first detection coil 11 and a second support portion 51b that supports the second detection coil 12.

[0046] The inspection device body 101 is configured so that the distance C1 (see Figure 5) between the center of the detection coil 10 (center Wa of the wire rope W) and the first detection coil 11 can be changed (adjusted) by moving the first support part 51a in the Y direction (Y1 direction or Y2 direction) using the drive unit 52. The inspection device body 101 is also configured so that the distance C2 (see Figure 5) between the center of the detection coil 10 (center Wa of the wire rope W) and the second detection coil 12 can be changed (adjusted) by moving the second support part 51b in the Y direction (Y1 direction or Y2 direction) using the drive unit 52.

[0047] During inspection of the wire rope W, the drive unit 52 moves the support unit 51 (detection coil 10) under the control of the control unit 31 so that the separation distances C1 and C2 become approximately equal. Note that the movement of the support unit 51 (detection coil 10) by the drive unit 52 may be controlled by the user (manually).

[0048] During inspection of the wire rope W, the inspection device body 101 uses the drive unit 52 to bring the support unit 51 closer to the wire rope W, thereby bringing the detection coils 10 (first detection coil 11 and second detection coil 12) closer to the wire rope W. During inspection of the wire rope W, the movement speed of the wire rope W (elevator 900) is slower than during normal operation of the elevator 900.

[0049] Furthermore, since the movement speed of the wire rope W (elevator 900) is faster during normal operation of the elevator 900 than during wire rope W inspection, the vibration amplitude of the wire rope W is also larger during normal operation than during wire rope W inspection. Therefore, as shown in Figure 6, the inspection device body 101 separates the support parts 51 (first support part 51a and second support part 51b) from the wire rope W using the drive unit 52, thereby separating the detection coils 10 (first detection coil 11 and second detection coil 12) from the wire rope W. As a result, the inspection device body 101 can prevent the vibrating wire rope W from coming into contact with the support parts 51 (detection coils 10) even during normal operation of the elevator 900 (other than during wire rope W inspection). As a result, the wire rope inspection device 100 does not need to be removed from the wire rope W during normal operation of the elevator 900 (except when inspecting the wire rope W), making it possible to permanently install the inspection device 101 on multiple wire ropes W of the elevator 900.

[0050] Furthermore, if the sensitivity (detection characteristics) of the first detection coil 11 and the second detection coil 12 are matched, the sum of the detection signals from the first detection coil 11 and the second detection coil 12 will remain constant even if the wire rope W vibrates. Therefore, by matching the sensitivity (detection characteristics) of the first detection coil 11 and the second detection coil 12 and accurately summing the detection signals from the first detection coil 11 and the second detection coil 12, noise caused by the vibration of the wire rope W (the position of the wire rope W) can be eliminated (canceled).

[0051] As shown in Figures 5 and 6, the first detection coil 11 and the second detection coil 12 are arranged (formed) in a convex U-shape (saddle shape) that moves away from the wire rope W when viewed from the Z direction (Z1 direction side or Z2 direction side). The first detection coil 11 and the second detection coil 12 are formed from a flexible material. For example, the first detection coil 11 and the second detection coil 12 are formed from a conductor pattern of an FPC (Flexible Printed Circuits). Alternatively, the first detection coil 11 and the second detection coil 12 may be arranged (formed) in a convex semicircular shape that moves away from the wire rope W when viewed from the Z direction (Z1 direction side or Z2 direction side). Furthermore, the detection coil 10, consisting of 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).

[0052] As shown in Figures 7 and 8, the detection coils 10 (first detection coil 11 and second detection coil 12) detect changes in the excitation magnetic flux in the radial direction of the wire rope W (a direction perpendicular to the length direction of the wire rope W). As shown in Figure 8, if a defect 200 exists in the wire rope W, the excitation magnetic flux deforms due to the defect 200, causing a change in the magnetic flux passing through the inside of the wire rope W. The detection coils 10 then detect this change in magnetic flux and output the change in magnetic flux caused by the defect 200 as a detection signal.

[0053] (Processing by the processing unit) In this embodiment, as shown in Figure 9, the processing unit 122 integrates the detection signal acquired by the detection coil 10, thereby converting the signal waveform 71 into an integrated signal waveform 72. By integrating the detection signal acquired by the detection coil 10, the change in magnetic flux passing through the inside of the wire rope W due to the defect 200 appears as a peak in the integrated signal waveform 72. Furthermore, when acquiring the integrated signal waveform 72, the processing unit 122 is configured to divide the integral value of a 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, by the sampling frequency (sampling rate) of the detection signal acquired by the detection coil 10. For example, if 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. If 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. Furthermore, the processing unit 122 may calculate the difference data between the detection signal (signal waveform 71) of the detection coil 10 during past inspections and the detection signal (signal waveform 71) of the detection coil 10 during the current inspection, and acquire the integrated signal waveform 72 based on the calculated difference data. In other words, the processing unit 122 may acquire the integrated signal waveform 72 based on the historical 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 integrated signal waveform 72.

[0054] Furthermore, in this embodiment, when acquiring the integrated signal waveform 72, the processing unit 122 is configured to correct the overall slope of the signal waveform 71 based on the detection signal of the detection coil 10 by subtracting the value based on the detection signal of the detection coil 10 from the 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 becomes 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), as shown in Figure 10, the processing unit 122 converts the signal waveform 71a, which has been tilted upward to the right due to an increase in the reference value (ground level) of the detection signal, into a corrected signal waveform 71b so that the slope of the entire waveform becomes flat by subtracting it using the approximation line 73. Then, the processing unit 122 converts the corrected signal waveform 71b into an integrated signal waveform 72 by integration processing. In other words, in this embodiment, the integrated signal waveform 72 is acquired after the detection of changes in magnetic flux in the inspection area of ​​the wire rope W is completed (post-processing). Note that the approximation line 73 is an example of the "approximation line" in the claims.

[0055] In this embodiment, the processing unit 122 is configured to acquire the peak portion of the signal integral waveform 72 as the portion where a defect 200 occurs in the wire rope W, and to output defect information 81 (information based on the magnitude of the defect 200 in the wire rope W) based on the acquired peak portion of the signal integral waveform 72.

[0056] In this embodiment, the processing unit 122 is configured to obtain the amount of change in the cross-sectional area of ​​the wire rope W caused by the defect 200, based on the peak height of the signal integral waveform 72, as the magnitude of the defect 200.

[0057] Figure 11 shows multiple signal integral waveforms 72 (signal integral waveforms A1, A2, A3, and A4) when detecting locations where changes in magnetic flux occur due to defect 200. The vertical axis of Figure 11 represents the integral value of each signal integral waveform A1 to A4, and the horizontal axis represents the distance traveled by the wire rope W (inspection position on the wire rope W). Signal integral waveforms A1 to A4 are signal integral waveforms 72 obtained when inspecting areas where the cross-sectional area has increased compared to the normal area (areas where defect 200 occurs) due to foreign matter adhering to the wire rope W. Furthermore, in signal integral waveforms A1, A2, A3, and A4, the changes in magnetic flux due to the increase in cross-sectional area by change amounts S1, S2, S3, and S4 (see Figure 12), respectively, due to the area where foreign matter has adhered (defect 200), are expressed as integral peak heights H1, H2, H3, and H4, respectively. In other words, the integral peak heights H1, H2, H3, and H4 represent the peak heights corresponding to the portions (defects 200) where the cross-sectional area of ​​the wire rope W increased by amounts S1, S2, S3, and S4, respectively. Furthermore, the values ​​of the integral peak heights H1, H2, H3, and H4 are, for example, the average values ​​of the integral values ​​within a predetermined interval 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 the signal integral waveform" in the claims. Also, the amounts of change S1, S2, S3, and S4 increase in this order.

[0058] As shown in Figure 12, the integral peak heights H1, H2, H3, and H4 of the signal integral waveforms A1, A2, A3, and A4, respectively, increase with the increase in the cross-sectional area of ​​the wire rope W detected during each inspection. In other words, a proportional relationship is observed between the change in the cross-sectional area of ​​the wire rope W S1 to S4 and the integral peak heights H1 to H4 of the signal integral waveform 72.

[0059] The processing unit 122 obtains the integral peak height of the signal integral waveform 72, and from the obtained integral peak height of the signal integral waveform 72, based on the correlation (proportional relationship) described above, obtains the amount of change in the cross-sectional area of ​​the wire rope W caused by the defect 200 in the cross-sectional direction of the wire rope W as the magnitude of the defect 200 in the cross-sectional direction of the wire rope W. In other words, the processing unit 122 obtains the magnitude 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 which changes in proportion to the amount of change in the cross-sectional area.

[0060] Furthermore, in this embodiment, the processing unit 122 is configured to obtain the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W as the size of the defect 200, based on the interval between the rising and falling edges of the peak (integral peak) of the signal integral waveform 72.

[0061] Figure 13 shows multiple signal integral waveforms 72 (signal integral waveforms B1, B2, B3, and B4) when detecting locations where changes in magnetic flux occur due to defects 200. The vertical axis of Figure 13 represents the integral value of each signal integral waveform B1 to B4, and the horizontal axis represents the distance traveled by 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 areas of the wire rope W where the cross-sectional area is reduced compared to the normal portion due to defects such as wire breakage. Furthermore, in each of the signal integral waveforms B1 to B4, the change in magnetic flux due to the reduction in cross-sectional area caused by defects 200 such as wire breakage is represented as a negatively convex peak. The length of the defects 200 detected in each of the signal integral waveforms B1 to B4 increases in the order of signal integral waveforms B1, B2, B3, and B4.

[0062] Furthermore, the intervals P1, P2, P3, and P4 between the rising and falling inflection points of the respective peaks (integral peaks) of the signal integral waveforms B1, B2, B3, and B4 change in accordance with the length of the defect 200 in the longitudinal direction. Specifically, the intervals P1, P2, P3, and P4 increase in this order.

[0063] Figure 14 shows multiple signal integral waveforms 72 (signal integral waveforms B5, B6, B7, and B8) when detecting locations where changes in magnetic flux occur due to defects 200. The vertical axis of Figure 14 represents the integral value of each signal integral waveform B5 to B8, and the horizontal axis represents the travel 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 areas where the cross-sectional area has increased compared to the normal portion due to foreign matter adhering to the wire rope W. Furthermore, in each of the signal integral waveforms B5 to B8, the change in magnetic flux due to the increase in cross-sectional area caused by defects 200 such as foreign matter adhesion is represented as a positively convex peak. The length of the defects 200 detected in each of the signal integral waveforms B5 to B8 increases in the order of signal integral waveforms B5, B6, B7, and B8.

[0064] Furthermore, the intervals P5, P6, P7, and P8 between the rising and falling inflection points of the respective peaks (integral peaks) of the signal integral waveforms B5, B6, B7, and B8 change in accordance with the length of the defect 200 in the longitudinal direction. Specifically, the intervals P5, P6, P7, and P8 increase in this order.

[0065] As shown in Figure 15, a correlation is observed between the intervals of inflection points (intervals P1 to P8) at each peak (integration peak) of the signal integral waveforms B1 to B8 and the length of the defect 200 in the longitudinal direction, as is clear from the relationship with the lengths L3 to -L3 shown on the vertical and horizontal axes. Furthermore, the intervals of inflection points (intervals P1 to P8) at each peak of the signal integral waveforms B1 to B8 are approximately the same as the length of the defect 200 detected in the longitudinal direction during each inspection.

[0066] The processing unit 122 obtains the interval between the rising and falling inflection points of the peaks (integration peaks) of the signal integral waveform 72, and from the obtained intervals of inflection points, obtains the length of the defect 200 in the wire rope W in the longitudinal direction based on the correlation described above. Specifically, the processing unit 122 obtains the interval between the inflection points at each peak of the signal integral waveform 72 as the magnitude (length) of the defect 200 in the wire rope W in the longitudinal direction.

[0067] As shown in Figure 16, in the wire rope inspection device 100, the display unit 124 displays defect information 81, which includes the lengths L4 and L5 of the defects 200 in the longitudinal direction of the wire rope W, and the size of the defects 200 in the cross-sectional direction of the wire rope W (changes in cross-sectional area S5 and S6), in correspondence with the signal integral waveform 72. By visually observing the signal integral waveform 72, the user can easily grasp the range and shape of the defects 200 (changes in magnetic flux caused by the defects 200). Furthermore, by visually observing the defect information 81, the user can easily grasp the length of the defects 200 in the longitudinal direction of the wire rope W and the size of the defects 200 in the cross-sectional direction of the wire rope W. In this embodiment, the display unit 124 is configured to display positional information of the wire rope W in the longitudinal direction in association with information based on the size of the defects 200 in the wire rope W. Specifically, the defect information 81 displayed on the display unit 124 associates the positional information of the wire rope W in the longitudinal direction with the movement distances D1 to D7 of the wire rope W during inspection (inspection positions on the wire rope W) in the signal integral waveform 72. In Figure 16, the portion of the defect 200 where the inspection position is at the movement distance D2 of the wire rope W has an increased cross-sectional area by a change of S5, so the defect information 81 shows the size of the defect 200 as "S5". Similarly, the portion of the defect 200 where the inspection position is at the movement distance D6 of the wire rope W has a decreased cross-sectional area by a change of S6, so the defect information 81 shows the size of the defect 200 as "-S6". The display unit 124 may also display a line representing the threshold value that the processing unit 122 detects as a defect 200 superimposed on the signal integral waveform 72.

[0068] (Process flow for wire rope inspection) Next, an example of the processing flow for acquiring defect information 81 (wire rope W inspection method) using the wire rope inspection device 100 according to this embodiment will be explained with reference to Figure 17.

[0069] In step 901, the magnetic flux of the wire rope W is detected. In step 901, the change in the magnetic flux of the wire rope W is detected while moving the detection coil 10 relative to the wire rope W, whose magnetization state has been excited by the excitation coil 20. Step 901 is an example of the "detection step" in the claims. After the completion of step 901, the processing steps proceed to step 902.

[0070] 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 a signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal detected in step 901. Step 902 is an example of the "acquisition step" in the claims. After the completion of step 902, the processing steps proceed to step 903.

[0071] In this embodiment, in step 902, the peak portion of the signal integral waveform 72 is obtained 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 is obtained as the magnitude of the defect 200. In addition, based on the interval between the inflection point of the rising edge and the inflection point of the falling edge of the peak in the signal integral waveform 72, the length of the defect 200 in the longitudinal direction of the wire rope W is obtained as the magnitude of the defect 200.

[0072] In step 903, defect information 81 is output. In step 903, defect information 81 is output based on the size of the defect 200 in the wire rope W obtained in step 902. Step 903 is an example of an "output step" in the claims. After the completion of step 903, the processing steps proceed to step 904.

[0073] In step 904, defect information 81 is displayed. In step 904, the defect information 81 output in step 903 is displayed on the display unit 124.

[0074] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0075] In this embodiment, the size of the defect 200 in the wire rope W is obtained based on a signal integral waveform 72, which is obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. This makes it possible to quantitatively obtain the size of the defect 200 in the wire rope W from the size of the defect 200 in the wire rope W obtained based on the signal integral waveform 72.

[0076] Furthermore, the wire rope inspection device 100 and wire rope inspection method according to the above embodiment are configured as follows, which provides the following additional benefits.

[0077] In the wire rope inspection device 100 and wire rope inspection method of this embodiment, the peak portion of the signal integral waveform 72 is acquired as the location where a defect 200 occurs in the wire rope W, and defect information 81 (information based on the size of the defect 200 in the wire rope W) based on the acquired peak portion of the signal integral waveform 72 is output. As a result, the user can determine 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.

[0078] Furthermore, in the wire rope inspection device 100 and wire rope inspection method of this embodiment, the change in the cross-sectional area of ​​the wire rope W caused by the defect 200 is obtained as the magnitude of the defect 200, based on the peak height (integration peak height) of the signal integral waveform 72. As a result, defect information 81 (information based on the magnitude of the defect 200 in the wire rope W) is obtained, which includes the change in the cross-sectional area of ​​the wire rope W caused by the defect 200 as the magnitude of the defect 200. As a result, the user can grasp the change in the cross-sectional area of ​​the wire rope W caused by the defect 200 from the defect information 81, and thus grasp the magnitude of the defect 200 in the cross-sectional direction of the wire rope W (the direction perpendicular to the longitudinal direction of the wire rope W).

[0079] Furthermore, in the wire rope inspection device 100 and wire rope inspection method of this embodiment, the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W is obtained as the size of the defect 200 based on the interval between the rising and falling edges of the peak (integration peak) of the signal integral waveform 72. As a result, defect information 81 (information based on the size of the defect 200 in the wire rope W) is obtained, which includes the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W as the size of the defect 200. Consequently, the user can understand the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W from the defect information 81.

[0080] 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). As a result, 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.

[0081] Furthermore, in this embodiment, the display unit 124 is configured to display positional information of the wire rope W in the longitudinal direction (Z direction) in association with defect information 81 (information based on the size of the defect 200 in the wire rope W). This allows the user to easily and visually grasp the size of the defect 200 in the wire rope W and its position in the longitudinal direction (Z direction) of the wire rope W.

[0082] Furthermore, in this embodiment, the processing unit 122 is configured to perform division by the sampling frequency of the detection signal acquired by the detection coil 10 on the integral value of the value based on the detection signal of the detection coil 10 when acquiring the signal integral waveform 72. As a result, even when a change in the magnetic flux of the wire rope W is detected by a different sampling frequency, division by the sampling frequency is performed, so fluctuations in the magnitude of the peak of the signal integral waveform 72 due to differences in sampling frequency can be suppressed. As a result, even when the sampling frequency during inspection is different, the magnitude of the defect 200 of the wire rope W can be appropriately acquired.

[0083] Furthermore, in this embodiment, the processing unit 122 is configured to correct the overall slope of the signal waveform 71 based on the detection signal of the detection coil 10 by subtracting the value based on the detection signal of the detection coil 10 by an approximation line (approximation straight line 73) of the value based on the detection signal of the detection coil 10 when acquiring the signal integral waveform 72, so that the slope of the entire signal waveform 71 based on the detection signal of the detection coil 10 becomes flat. As a result, even if the value of the detection signal gradually increases so that the entire signal waveform 71 slopes regardless of the presence or absence of defects 200 in the wire rope W, due to the gradual increase in the reference value (ground level) of the detection signal when the detection coil 10 detects the detection signal, 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, it is possible to suppress changes in the signal integral waveform 72 obtained by integrating the signal waveform 71, regardless of the presence or absence of defects 200 in the wire rope W. This makes it possible to prevent false detection of defects 200 based on the signal integral waveform 72.

[0084] [Differentiation] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than by the description of the embodiments above, and further includes all modifications (exceptions) within the meaning and scope equivalent to the claims.

[0085] For example, in the above embodiment, a processing unit 122 of a processing terminal 102, which is provided separately from the inspection device body 101, is shown to acquire the magnitude of the defect 200 in the wire rope W based on a signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. However, the present invention is not limited to this. In the present invention, the control unit 31 (see Figure 2) of the inspection device body 101 may acquire the magnitude of the defect 200 in the wire rope W based on a signal integral waveform 72 obtained by integrating the signal waveform 71 based on the detection signal of the detection coil 10. In this case, the control unit 31 is an example of a "processing unit" in the claims. Furthermore, in the present invention, a processing device such as a server that is communicably connected to the wire rope inspection device may acquire the magnitude 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.

[0086] Furthermore, in the above embodiment, the size of the defect 200 is shown to be the change in the cross-sectional area of ​​the wire rope W due to the defect 200, and the length of the defect 200 in the longitudinal direction (Z direction) of the wire rope W. However, the present invention is not limited to this. In the present invention, the size of the defect may be determined by obtaining only one of the following: the change in the cross-sectional area of ​​the wire rope due to the defect, and the length of the defect in the longitudinal direction of the wire rope.

[0087] Furthermore, in the above embodiment, an example was shown in which the display unit 124 displays defect information 81 including a signal integral waveform 72 as information based on the size of the defect 200 in the wire rope W (see Figure 16), but the present invention is not limited thereto. In the present invention, as shown in the modified example in Figure 18, the display unit 124 may display defect information 82 that does not include a signal integral waveform as information based on the size of the defect 200 in the wire rope. The defect information 82 displays the location of the defect in the longitudinal direction of the wire rope and the type of defect. In addition, in the present invention, the display unit 124 may be configured to switch between displaying defect information 81 and defect information 82. In addition, in the present invention, the location of the defect and the size of the defect may be displayed numerically as information based on the size of the defect in the wire rope.

[0088] Furthermore, in the above embodiment, an example was shown in which the display unit 124 is configured to display positional information of the wire rope W in the longitudinal direction (Z direction) in association with defect information 81 (information based on the size of the defect 200 in the wire rope W), but the present invention is not limited thereto. In the present invention, only the position and size of the defect detected in the inspection area may be displayed on the display unit.

[0089] Furthermore, in the above embodiment, an example was shown in which the processing unit 122 is configured to perform division by the sampling frequency of the detection signal acquired by the detection coil 10 on the integral value of the value based on the detection signal of the detection coil 10 when acquiring the signal integral waveform 72, but the present invention is not limited to this. In the present invention, when acquiring the signal integral waveform, division by the sampling frequency of the detection signal acquired by the detection coil on the integral value of the value based on the detection signal of the detection coil is not required. For example, the detection signal may be acquired at the same sampling frequency during all inspections, and the signal integral waveform may be acquired without performing division by the sampling frequency.

[0090] Furthermore, in the above embodiment, an example was shown in which the processing unit 122 is configured to correct the overall slope of the signal waveform 71 based on the detection signal of the detection coil 10 by subtracting the value based on the detection signal of the detection coil 10 by an approximation line (approximation line 73) of the value based on the detection signal of the detection coil 10 when acquiring the signal integral waveform 72 after the detection of the change in magnetic flux in the inspection area of ​​the wire rope W has been completed (post-processing), so that the slope of the overall signal waveform based on the detection signal of the detection coil becomes flat. However, the present invention is not limited to this. In the present invention, the processing unit may, when acquiring the signal integral waveform in real time while detecting the change in magnetic flux in the inspection area of ​​the wire rope, correct the overall slope of the signal waveform based on the detection signal of the detection coil by subtracting the value based on the detection signal of the detection coil by the average value of the value based on the detection signal of the detection coil, so that the slope of the overall 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 whether there are defects in the wire rope or not. As a result, it is possible to prevent false detection of defects based on the signal integral waveform.

[0091] Furthermore, in the above embodiment, an example was shown in which the processing unit 122 is configured to correct the overall slope of the signal waveform 71 based on the detection signal of the detection coil 10 by subtracting the value based on the detection signal of the detection coil 10 by an approximate straight line 73 of the value based on the detection signal of the detection coil 10 when acquiring the signal integral waveform 72, so that the slope of the overall signal waveform based on the detection signal of the detection coil becomes flat. However, the present invention is not limited to this. In the present invention, the processing unit may correct the overall slope of the signal waveform based on the detection signal of the detection coil by subtracting 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 when acquiring the signal integral waveform. In this case, the approximate curve is an example of the "approximation line" in the claims.

[0092] Furthermore, although the above embodiment shows an example in which the detection coil 10 includes a first detection coil 11 and a second detection coil 12 arranged to sandwich the wire rope W from each other, the present invention is not limited thereto. In the present invention, the detection coil may be a coil wound along the circumferential direction of the wire rope. Also, the detection coil may not surround the wire rope but be arranged only in a part of the circumferential direction of the wire rope, and may detect only a part of the leakage magnetic flux of the wire rope. In other words, 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 by the total magnetic flux method.

[0093] Furthermore, in the above embodiment, for the sake of explanation, the processing when acquiring defect information 81 (during wire rope W inspection) was described using a flow-driven flowchart that processes the information sequentially according to the processing flow, but the present invention is not limited to this. In the present invention, the processing operation may be performed by event-driven processing, which executes processing on an event-by-event basis. In this case, it may be performed as a completely event-driven system, or a combination of event-driven and flow-driven systems may be used.

[0094] Furthermore, although the above embodiment shows an example of inspecting a wire rope W used in an elevator 900, the present invention is not limited to this. The present invention may also be a wire rope inspection device and wire rope method for inspecting wire ropes used in cranes, ropeways, suspension bridges, and robots. In cases where the wire rope itself does not move, such as wire ropes used in suspension bridges, the detection coil of the wire rope inspection device can be moved along the wire rope while the magnetic flux of the wire rope is measured by the wire rope inspection device.

[0095] [Pattern] Those skilled in the art will understand that the exemplary embodiments described above are specific examples of the following embodiments.

[0096] (Item 1) A detection coil that moves relative to the wire rope and detects changes in the magnetic flux of the wire rope, A wire rope inspection device comprising: a processing unit that acquires the magnitude of a defect in the wire rope based on a signal integrated waveform obtained by integrating the signal waveform based on the detection signal of the detection coil; and a processing unit that acquires the magnitude of a defect in the wire rope based on a signal integrated waveform obtained by integrating the signal waveform based on the detection signal of the detection coil.

[0097] (Item 2) The wire rope inspection apparatus according to item 1, wherein the processing unit is configured to acquire the peak portion of the signal integral waveform as the portion where the defect occurs in the wire rope, and to output information based on the magnitude of the defect in the wire rope based on the acquired peak portion of the signal integral waveform.

[0098] (Item 3) The wire rope inspection apparatus according to item 1 or 2, wherein the processing unit is configured to obtain, based on the peak height of the signal integral waveform, the amount of change in the cross-sectional area of ​​the wire rope caused by the defect in the wire rope as the magnitude of the defect.

[0099] (Item 4) The wire rope inspection apparatus according to any one of items 1 to 3, wherein the processing unit is configured to obtain the length of the defect in the longitudinal direction of the wire rope as the magnitude of the defect, based on the interval between the rising and falling edges of the peak of the signal integral waveform.

[0100] (Item 5) A 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.

[0101] (Item 6) The wire rope inspection device according to item 5, wherein the display unit is configured to display positional information of the wire rope in the longitudinal direction in association with information based on the size of the defect in the wire rope.

[0102] (Item 7) The wire rope inspection apparatus according to any one of items 1 to 6, wherein the processing unit is configured to perform division by the sampling frequency of the detection signal acquired by the detection coil on the integral value of the value based on the detection signal of the detection coil when acquiring the signal integral waveform.

[0103] (Item 8) The wire rope inspection device according to any one of items 1 to 7, wherein the processing unit is configured to correct the overall slope of the signal waveform based on the detection signal of the detection coil by subtracting the value based on the detection signal of the detection coil by the average value or approximation line of the value based on the detection signal of the detection coil when acquiring the signal integral waveform.

[0104] (Item 9) A detection step for detecting a change in the magnetic flux of a wire rope, A wire rope inspection method comprising: an acquisition step of acquiring the magnitude of a defect in the wire rope based on a signal integrated waveform obtained by integrating the signal waveform based on the detection signal detected in the detection step.

[0105] (Item 10) The acquisition step includes acquiring the peak portion of the signal integral waveform as the portion in the wire rope where the defect occurs. 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, based on the size of the defect in the wire rope acquired in the acquisition step.

[0106] (Item 11) The wire rope inspection method according to item 9 or 10, wherein the acquisition step includes acquiring, based on the peak height of the signal integral waveform, the amount of change in the cross-sectional area of ​​the wire rope due to the defect, as the magnitude of the defect.

[0107] (Item 12) The wire rope inspection method according to any one of items 9 to 11, wherein the acquisition step includes acquiring the length of the defect in the longitudinal direction of the wire rope as the magnitude of the defect, based on the interval between the rising and falling edges of the peak of the signal integral waveform. [Explanation of symbols]

[0108] 10 detection coils 71, 71a, 71b signal waveform 72, A1~A4, B1~B8 Signal integral waveform 73 Approximate straight line (approximate line) 81, 82 Defect information (information based on the size of defects in wire ropes) 100 Wire Rope Inspection Device 122 Processing Unit 124 Display section 200 defects H1~H4 Integral peak height (height of the peak in the integrated waveform of the signal) L4, L5 (defect) length P1~P8 interval Changes in S1-S6 W Wire Rope

Claims

1. A detection coil that moves relative to the wire rope and detects changes in the magnetic flux of the wire rope, A wire rope inspection device comprising: a processing unit that acquires the magnitude of a defect in the wire rope based on the rising and falling edges of the peak of a signal integral waveform obtained by integrating the signal waveform based on the detection signal of the detection coil.

2. The wire rope inspection apparatus according to claim 1, wherein the processing unit is configured to acquire the peak portion of the signal integral waveform as the portion where the defect occurs in the wire rope, and to output information based on the magnitude of the defect in the wire rope based on the acquired peak portion of the signal integral waveform.

3. The wire rope inspection apparatus according to claim 1 or 2, wherein the processing unit is configured to acquire, based on the peak height of the signal integral waveform, the amount of change in the cross-sectional area of ​​the wire rope caused by the defect in the wire rope as the magnitude of the defect.

4. The wire rope inspection apparatus according to any one of claims 1 to 3, wherein the processing unit is configured to obtain the length of the defect in the longitudinal direction of the wire rope as the magnitude of the defect, based on the interval between the rising and falling edges of the peak of the signal integral waveform.

5. 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.

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

7. The wire rope inspection apparatus according to any one of claims 1 to 6, wherein the processing unit is configured to perform division by the sampling frequency of the detection signal acquired by the detection coil on the integral value of the value based on the detection signal of the detection coil when acquiring the signal integral waveform.

8. The wire rope inspection apparatus according to any one of claims 1 to 7, wherein the processing unit is configured to correct the overall slope of the signal waveform based on the detection signal of the detection coil by subtracting the value based on the detection signal of the detection coil by the average value or approximation line of the value based on the detection signal of the detection coil when acquiring the signal integral waveform.

9. A detection step for detecting a change in the magnetic flux of a wire rope, A wire rope inspection method comprising: an acquisition step of acquiring the magnitude of a defect in the wire rope based on the rising and falling edges of the peak of a signal integral waveform obtained by integrating the signal waveform based on the detection signal detected in the detection step.

10. The acquisition step includes acquiring the peak portion of the signal integral waveform as the portion in the wire rope where the defect occurs. 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, based on the size of the defect in the wire rope acquired in the acquisition step.

11. The wire rope inspection method according to claim 9 or 10, wherein the acquisition step includes acquiring, based on the height of the peak of the signal integral waveform, the amount of change in the cross-sectional area of ​​the wire rope due to the defect, as the magnitude of the defect.

12. The wire rope inspection method according to any one of claims 9 to 11, wherein the acquisition step includes acquiring the length of the defect in the longitudinal direction of the wire rope as the magnitude of the defect, based on the interval between the rising and falling of the peak of the signal integral waveform.

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