JP7200697B2 - WIRE ROPE INSPECTION DEVICE AND WIRE ROPE INSPECTION METHOD - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wire rope inspection device and wire rope inspection method, and more particularly to a wire rope inspection device and wire rope inspection method for detecting magnetic flux of a wire rope.

2. Description of the Related Art Conventionally, there is known a wire rope inspection device that detects the magnetic flux of a wire rope (see Patent Document 1, for example).

The above Patent Document 1 discloses a wire rope monitoring system (wire rope inspection) including a detection coil for detecting leakage magnetic flux of a wire rope and a control unit for detecting the state of the wire rope based on a detection signal acquired by the detection coil. device) is disclosed. Specifically, the wire rope inspection device described in Patent Document 1 determines whether or not the wire rope (magnetic material) is damaged, depending on whether or not the intensity of the detection signal exceeds a threshold value. ing.

Here, if multiple damages occur locally in the wire rope (magnetic material), the mechanical strength of those parts decreases, so even if the number of damages is small, the wire rope (magnetic material) cannot be replaced. may be required. Therefore, in the wire rope (magnetic material) inspection, there is a need to obtain not only the strength of the detection signal but also the number of damages.

WO2007/116884

However, in the wire rope inspection device described in Patent Document 1, damage to the wire rope (magnetic material) is determined based on whether or not the strength of the detection signal exceeds the threshold. Therefore, it is impossible to distinguish whether the detection signal exceeding the threshold is based on one damage or a detection signal based on a set of multiple damages, and it is difficult to obtain the number of damages on the wire rope (magnetic material). There is a problem that it is not possible to

The present invention has been made to solve the above problems, and one object of the present invention is to provide a wire rope inspection device and wire rope inspection method capable of obtaining the number of damages on a wire rope. is to provide

In order to achieve the above object, the inventors of the present application conducted extensive studies and found that the shape of the waveform of the detection signal when a plurality of damages are superimposed on the wire rope is based on the waveform of the detection signal when one damage occurs. A new knowledge was obtained that simulation can be performed by superimposing the model waveforms created in the previous section. The wire rope inspection device according to the first aspect of the present invention utilizes this new knowledge to obtain the number of damages on the wire rope . That is, the wire rope inspection device according to the first aspect of the present invention includes a detection coil that detects a change in the total magnetic flux of the wire rope , a detection unit that outputs a detection signal, and a wire rope that detects a wire breakage. A storage unit for storing a model waveform of the damage indicating the waveform of the detection signal when the damage is superimposed, and a control unit for acquiring at least information about the number of damages superimposed on the wire rope based on the model waveform and the detection signal. and Note that the model waveform in the present invention is a concept that includes not only a diagram of the signal waveform based on the waveform of the detection signal when one damage occurs, but also a function (formula) representing the signal waveform.

With the wire rope inspection apparatus according to the first aspect of the present invention, the number of damages superimposed on the wire rope can be acquired from the model waveform and the detection signal by the configuration as described above. As a result, it is possible to provide a wire rope inspection device capable of obtaining the number of damages superimposed on the wire rope. In addition, by superimposing the model waveforms, it is possible to generate a model of the waveform of the detection signal when multiple damages are superimposed on the wire rope . You can get the number of damages superimposed on the rope . In this specification, "the number of damages superimposed on the wire rope " means the number based on the model waveform. Specifically, the signal intensity is acquired in advance when a break occurs in one wire, and a model waveform of the acquired signal intensity is generated. Since the generated model waveform has the signal intensity of one wire breakage, the number of damages superimposed on the wire rope is acquired based on the signal intensity of the wire rope detection signal and the signal intensity of the model waveform. be able to.

In the wire rope inspection device according to the first aspect, preferably, the control unit acquires the number of damages superimposed on the same region of the wire rope based on a difference in signal strength of the detection signal with respect to signal strength of the model waveform. is configured as With this configuration, it is possible to obtain the number of damages based on the signal intensity of the detection signal. The number of damages on the wire rope in the area where the detection signal exceeds the threshold can be accurately grasped, compared to the case of detecting whether or not. As a result, it is possible to accurately ascertain the number of pains superimposed on the same region of the wire rope , so that it is possible to accurately ascertain when to replace the wire rope .

The wire rope inspection apparatus according to the first aspect preferably further includes a position information acquisition section that acquires position information of the detection section when the detection signal of the wire rope is detected, and the control section includes a model waveform, a detection Based on the signal and the position information, at least distribution information of a plurality of damages superimposed on the wire rope is obtained. With this configuration, it is possible to grasp the number and localization of damages on the wire rope based on the distribution information on the damages on the wire rope. As a result, it becomes possible to grasp a partial decrease in the mechanical strength of the wire rope , and to grasp the replacement timing of the wire rope.

In this case, the model waveform is preferably a waveform model based on a model function based on the position information of the detection unit when the detection signal is detected in the wire rope and the strength of the detection signal. By using such a model waveform, by changing the position where the damage occurs in the model waveform and the intensity of the detection signal at the position where the damage occurs, the pattern of the waveform that serves as a reference for superimposition can be varied at various positions and intensities. Since it is possible to increase the number differently, model waveforms of various patterns can be obtained. As a result, it is possible to acquire the model waveform that best matches the waveform of the detection signal from among model waveforms of various patterns, so it is possible to improve the accuracy of acquiring the distribution information of damage to the wire rope . .

In the configuration using the model waveform, preferably, the model waveform is a waveform model based on a function obtained by adding model functions in the case where a plurality of damages are separated and superimposed on the wire rope . With this configuration, model waveforms capable of coping with superposition of various patterns of damage can be easily constructed by adding model functions when damage occurs at various positions.

In the wire rope inspection device according to the first aspect, preferably, the control unit acquires the number of damages on the wire rope based on the degree of approximation between the acquired waveform shape of the detection signal and the shape of the model waveform. is configured as With this configuration, it is possible to obtain a model waveform that is most similar to the waveform of the detection signal by obtaining the degree of approximation. As a result, the number of damages on the wire rope can be obtained from the waveform of the model waveform that is most similar to the waveform of the detection signal, so the number of damages on the wire rope can be obtained from the detection signal.

In this case, preferably, the control unit is configured to obtain the number of damages on the wire rope by analyzing the waveform of the detection signal and the model waveform by the method of least squares. With this configuration, the degree of approximation between the waveform of the detection signal and the waveform of the model waveform can be easily obtained by the method of least squares. As a result, the number of damaged wire ropes can be easily obtained.

In the wire rope inspection device according to the first aspect, preferably, the detection coil includes a pair of differential coils, and the control unit obtains a difference value between detection signals detected by each of the pair of differential coils. At the same time, it is configured to acquire at least the number of damages on the wire rope based on the acquired difference value and the model waveform. With this configuration, noise is canceled by the differential coil to obtain a detection signal with less noise, and the number of damages to the wire rope can be determined based on the waveform of the detection signal with less noise. Since it can be obtained, the number of damages on the wire rope can be obtained with higher accuracy.

The wire rope inspection apparatus according to the first aspect preferably further includes a magnetic field applying section that adjusts the magnetization direction of the wire rope before the detecting section detects the detection signal. With this configuration, it is possible to adjust the orientation of the magnetization of the wire rope by the magnetic field applying section before the detection section detects a change in the total magnetic flux of the wire rope . It is possible to suppress the influence of noise caused by As a result, since the influence of noise is suppressed, it is possible to detect each damage caused to the wire rope with high accuracy, and the number of damages on the wire rope can be obtained with even higher accuracy.

A wire rope inspection method according to a second aspect of the present invention comprises steps of obtaining detection signal data based on a change in total magnetic flux of a wire rope detected by a detection unit including a detection coil; obtaining information about the number of damages, including breaks in the wires , superimposed on at least the wire rope based on the waveform and the detection signal data.

In the wire rope inspection method according to the second aspect of the present invention, with the configuration as described above, similar to the wire rope inspection device according to the first aspect, based on the new findings of the inventors of the present application, the wire rope inspection method A wire rope inspection method capable of acquiring the number of damages can be provided.

According to the present invention, as described above, it is possible to provide a wire rope inspection device and wire rope inspection method capable of acquiring the number of damages on a wire rope.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the structure of the magnetic body test|inspection apparatus by 1st Embodiment. FIG. 2 is a schematic diagram showing an elevator in which a wire rope inspected by the magnetic material inspection device according to the first embodiment is used; It is a figure for demonstrating the structure of the detection part of the magnetic material inspection apparatus by 1st Embodiment, and a magnetic field application part. It is a block diagram which shows the control-like structure of the magnetic material test|inspection apparatus by 1st Embodiment. FIG. 10 is a diagram showing waveforms of detection signals when measuring a magnetic material (wire rope) in which one disconnection has occurred by a differential coil; FIG. 10 is a diagram showing a model waveform of a detection signal when measuring a magnetic material (wire rope) in which one disconnection has occurred; FIG. 10 is a diagram showing model waveforms when the number of wire breaks and the positions where wire breaks occur are changed; FIG. 4 is a schematic diagram for explaining discretization of a magnetic body when the magnetic body inspection device inspects the magnetic body; 4 is a flow chart for explaining the flow of processing in which the magnetic body inspection device acquires the distribution of disconnection of the magnetic body (wire rope). FIG. 10 is a schematic diagram for explaining a disconnection point of a strand of a magnetic body (wire rope) according to the second embodiment; 8A and 8B are schematic diagrams for explaining a configuration for acquiring the number of disconnections of magnetic bodies in the same region according to the second embodiment; FIG. 9 is a flow chart for explaining the flow of processing in which the magnetic body inspection apparatus according to the second embodiment acquires the number of disconnections in the same region of the magnetic body (wire rope). FIG. 8 is a diagram showing waveforms of detection signals when a magnetic material (wire rope) on which different types of damage are superimposed is measured according to the first modification of the first embodiment; It is the schematic which shows the structure of the magnetic material inspection apparatus by the 2nd modification of 1st Embodiment. 8A and 8B are schematic diagrams (A) and (B) for explaining addition of detection signals of a plurality of magnetic bodies (wire ropes) having different disconnection positions according to a modification of the second embodiment; FIG. 8A and 8B are schematic diagrams (A) and (B) for explaining addition of detection signals when disconnections of a plurality of magnetic bodies (wire ropes) are located in the same region according to a modification of the second embodiment; FIG.

Embodiments embodying the present invention will be described below with reference to the drawings.

The configuration of a magnetic material inspection apparatus 100 according to the first embodiment will be described with reference to FIGS. 1 to 8. FIG.

(Configuration of magnetic material inspection device)
As shown in FIG. 1, the magnetic material inspection device 100 is configured to inspect damage to a wire rope W, which is an object to be inspected. The magnetic material inspection apparatus 100 includes a magnetic material inspection section 1 and an analysis section 2 . The magnetic material inspection unit 1 includes a detection unit 3 and a position information acquisition unit 46 . The analysis unit 2 includes a communication unit 21 , a control unit 22 , a storage unit 23 and a display unit 24 . Detailed configurations of the magnetic material inspection unit 1 and the analysis unit 2 will be described later. Note that, in the first embodiment, the magnetic material inspection apparatus 100 is configured to detect a disconnection Dp of the wires Ws (see FIG. 10) of the wire rope W as damage to the wire rope W. FIG. A detailed configuration in which the magnetic material inspection apparatus 100 detects a breakage Dp of the wires Ws of the wire rope W will be described later.

The example shown in FIG. 2 is an example in which the magnetic material inspection apparatus 100 inspects the wire rope W while relatively moving along the surface of the wire rope W in the direction in which the wire rope W extends (the X direction). In the example shown in FIG. 2, the wire rope W is used in an elevator E, for example. The elevator E includes a cage E1, a hoist E2 that winds up a wire rope W to raise and lower the cage E1, and a position sensor E3 that detects the position of the cage E1 (wire rope W). In the elevator E, since the wire rope W is moved by the hoist E2, inspection is performed as the wire rope W is moved while the magnetic material inspection device 100 is fixed. The wire rope W is arranged so as to extend in the X direction at the position of the magnetic material inspection device 100 .

The analysis unit 2 is connected to the magnetic material inspection apparatus 100 via the communication unit 47 .

As shown in FIG. 3 , the magnetic material inspection apparatus 100 is configured to detect changes in the magnetic field (total magnetic flux) of the wire rope W using the detection coil 30 .

(Structure of wire rope)
The wire rope W is a magnetic body made of a long material extending in the X direction. The wire rope W is formed by weaving (for example, strand weaving) a magnetic wire material. The wire rope W is monitored for its condition (presence or absence of scratches, etc.) in order to prevent breakage due to deterioration. Then, the wire rope W whose deterioration has progressed beyond a predetermined amount is replaced.

(Structure of magnetic field application unit)
As shown in FIG. 3 , the magnetic field application unit 5 is configured to adjust the magnetization direction of the wire rope W before the detection signal is detected by the detection unit 3 . Magnetic field applying section 5 includes a first magnetic field applying section including magnets 51 and 52 and a second magnetic field applying section including magnets 53 and 54 . The first magnetic field applying section (magnets 51 and 52) is arranged on one side (X1 direction side) of the detecting section 3 in the direction in which the wire rope W extends. Also, the second magnetic field applying section (magnets 53 and 54) is arranged on the other side (the X2 direction side) of the direction in which the wire rope W extends with respect to the detecting section 3 .

(Structure of detector)
The detection unit 3 includes a detection coil 30 that detects changes in the total magnetic flux of the wire rope W, and is configured to output a detection signal. Sense coil 30 includes a pair of differential coils 34 having receive coils 11 and 12 . Detector coil 30 (differential coil 34) and excitation coil 33 are arranged along the direction in which wire rope W extends (X direction), with the direction in which wire rope W extends as a central axis, as shown in FIG. It is wound multiple times. Further, the detection coil 30 and the excitation coil 33 are coils that include conductor portions that are formed to be cylindrical along the X direction in which the wire rope W extends. Therefore, the plane formed by the wire portions around which the detector coil 30 and the excitation coil 33 are wound is substantially orthogonal to the direction in which the wire rope W extends (the X direction). A wire rope W passes through the sensing coil 30 and the excitation coil 33 . Also, the detection coil 30 is provided inside the excitation coil 33 . Note that the arrangement of the detector coil 30 and the excitation coil 33 is not limited to this. Of the receiving coils 11 and 12, the receiving coil 11 is arranged on the X1 direction side. Further, the receiving coil 12 of the receiving coils 11 and 12 is arranged on the X2 direction side.

The sensing coil 30 is configured to sense changes in the total magnetic flux of the wire rope W. FIG. Specifically, the detection coil 30 is configured to detect a change in the magnetic field of the wire rope W, which is the object to be inspected, in the X direction by means of the pair of reception coils 11 and 12 . That is, the detection coil 30 detects changes in the total magnetic flux in the X direction with respect to the wire rope W to which the magnetic field is applied by the excitation coil 33 . Further, the detection coil 30 is configured to output the detected change in the magnetic field of the wire rope W in the X direction. Further, the detection coil 30 is arranged so that substantially all of the magnetic field generated by the excitation coil 33 can be detected (inputted).

The excitation coil 33 excites the magnetization state of the wire rope W. As shown in FIG. Specifically, when the exciting alternating current is supplied to the exciting coil 33, an alternating magnetic field generated based on the exciting alternating current is applied inside the exciting coil 33, thereby changing the magnetization state of the wire rope W. configured to excite.

If there is a defect (flaw etc.) in the wire rope W, the total magnetic flux (a value obtained by multiplying the magnetic field by the permeability and the area) of the wire rope W at the part with the defect (flaw etc.) smaller than the part without As a result, for example, when the receiving coil 11 is positioned at a location with a defect (such as a scratch), the amount of magnetic flux passing through the receiving coil 12 changes compared to that of the receiving coil 11, resulting in a difference in the voltage detected by the detecting coil 30. becomes large (difference value of detection signal). On the other hand, the detection signal in a portion without defects (scratches, etc.) is substantially zero. Thus, a clear signal (a signal with a good S/N ratio) representing the presence of a defect (such as a scratch) is detected in the detection coil 30 . Thereby, the electronic circuit section 4 can detect the presence of a defect (such as a flaw) in the wire rope W based on the value of the detection signal.

(Structure of magnetic material inspection section)

As shown in FIG. 4 , the magnetic material inspection section 1 includes a detection section 3 and an electronic circuit section 4 . The detector 3 includes a detector coil 30 and an excitation coil 33 . The electronic circuit section 4 includes an inspection control section 41 , a reception I/F 42 , a storage section 43 , an excitation I/F 44 , a power supply circuit 45 , a position information acquisition section 46 and a communication section 47 . The magnetic material inspection apparatus 100 also includes a magnetic field application unit 5 (see FIG. 3).

The inspection control section 41 of the electronic circuit section 4 shown in FIG. 4 is configured to control each section of the magnetic material inspection apparatus 100 . Specifically, the examination control unit 41 includes a processor such as a CPU (Central Processing Unit), a memory, an AD converter, and the like.

The inspection control section 41 is configured to acquire a detection signal based on the total magnetic flux detected by the detection coil 30 . Further, the inspection control section 41 is configured to receive detection signals detected by each of the pair of differential coils 34 and output them to the analysis section 2 via the communication section 47 . Further, the inspection control unit 41 is configured to perform control to excite the excitation coil 33 .

The inspection control unit 41 is also configured to acquire position information of the detection unit 3 (detection coil 40 ) in the wire rope W via the position information acquisition unit 46 . In the first embodiment, as the position information, the position where the detection unit 3 (the detection coil 40) detects the entire magnetic flux of the wire rope W and the discretized position x _i (see FIG. 8) are acquired. The inspection control unit 41 is configured to acquire the position information of the detection unit 3 from the position sensor E3 of the elevator E, for example. A position sensor (not shown) for detecting the position of the detection unit 3 may be provided in the magnetic material inspection apparatus 100 itself. Note that the position _xi is an example of "positional information of the detection unit" in the scope of claims.

The storage unit 43 stores detection information in which the position information when the detection signal of the wire rope W is detected by the inspection control unit 41 is associated with the detection signal of the wire rope W detected by the detection coil 30 (differential coil 34). is configured to store The storage unit 43 can be configured by, for example, an HDD (Hard Disk Drive) or an SSD (Solid State drive). Also, the inspection control unit 41 is configured to transmit detection information to the analysis unit 2 via the communication unit 47 .

The reception I/F 42 is configured to receive a signal (voltage value) based on the total magnetic flux from the detection coil 30 under the control of the inspection control section 41 and transmit it to the inspection control section 41 . Specifically, the reception I/F 42 includes an amplifier. The reception I/F 42 is also configured to amplify a signal based on the total magnetic flux of the detection coil 30 and transmit it to the inspection control section 41 .

The excitation I/F 44 is configured to control power supply to the excitation coil 33 under the control of the inspection control section 41 . Specifically, the excitation I/F 44 controls power supply from the power supply circuit 45 to the excitation coil 33 based on the control signal from the inspection control section 41 .

The position information acquisition unit 46 is configured to acquire position information of the detection unit 3 when the detection signal of the wire rope W of the detection unit 3 is detected under the control of the inspection control unit 41 . The position information acquisition unit 46 is configured to acquire the position information of the detection unit 3 acquired by the position sensor E3 of the elevator E. As shown in FIG. For example, including serial communication ports.

(Configuration related to acquisition of wire rope disconnection distribution information)
In the first embodiment, the magnetic material inspection apparatus 100 is configured to acquire the disconnection Dp (distribution information of the disconnection Dp) occurring in the wire rope W by the analysis unit 2 . A magnetic material inspection apparatus 100 is connected to the analysis unit 2 via a communication unit 21 . The communication unit 21 is configured to receive detection information of the wire rope W acquired by the magnetic material inspection unit 1 under the control of the control unit 22 . Communication unit 21 includes, for example, a serial communication port.

The control unit 22 is composed of a CPU, memory, etc., and is configured to function as the control unit 22 of the analysis unit 2 by executing various programs stored in the storage unit 23 . Further, the control unit 22 is configured to acquire a difference value between the detection signals detected by each of the pair of differential coils 34 . Further, the control unit 22 is configured to acquire distribution information of the disconnection Dp of the wires Ws of the wire rope W based on the detection information of the wire rope W received. A detailed configuration in which the control unit 22 acquires the distribution information of the wire breakage Dp of the wire rope W will be described later.

The storage unit 23 stores various programs executed by the control unit 22 . Further, the storage unit 23 is configured to store a model waveform Wm of the disconnection Dp that indicates the waveform of the detection signal when the wire rope W has the disconnection Dp. Storage unit 23 includes, for example, an HDD or an SSD.

The display unit 24 is configured to display the wire breakage Dp occurring in the wire rope W acquired by the control unit 22 (distribution information of the wire breakage Dp). Display unit 24 includes, for example, a liquid crystal monitor.

FIG. 5 is a schematic diagram of the waveform Wd of the detection signal when one wire breakage Dp occurs in the wire rope W. As shown in FIG. The inventor of the present invention has found that the shape of the waveform Wd of the detection signal when the disconnection Dp is superimposed on the wire rope W is obtained by superimposing the model waveform Wm obtained from the waveform Wd of the detection signal when one disconnection Dp occurs. The knowledge that it can be obtained by Therefore, the inventor of the present invention constructed a model waveform Wm showing a waveform as shown in FIG. 6 based on the waveform Wd of the detection signal when one disconnection Dp shown in FIG. 5 occurs. Details of the model waveform Wm will be described later. In the graph of the waveform Wd shown in FIG. 5 and the graph of the model waveform Wm shown in FIG.

The model waveform Wm when the wire rope W has a wire breakage Dp changes in shape as shown in FIG. The examples shown in FIG. 7 are examples in which the wire rope W has 1, 3, 4, 6, 12, and 2 breaks Dp. When there are 1, 3, 4, 6, 12, and 2 disconnections Dp in the wire rope W, the shapes of the model waveforms Wm are waveforms Wm1, Wm2, and Wm2, respectively. It becomes the shape shown by waveform Wm3, waveform Wm4, waveform Wm5, and waveform Wm6. In the graph of the model waveform Wm shown in FIG. 7, the vertical axis indicates the signal strength, and the horizontal axis indicates the detection position of the detection coil 30 .

In the example shown in FIG. 7, for convenience, the intensity of the waveform Wd of each detection signal is changed from the actual intensity. That is, the model waveform Wm2 in the case where the wire breakage Dp occurs at three locations shown in the graph f2 has a signal strength of 1 compared to the model waveform Wm1 in the case where the wire breakage Dp occurs at one location shown in the graph f1. /3. In addition, when there are 4, 6, 12, and 2 breaks Dp at the positions shown in graphs f3 to f6, the signal strength is set to 1 for the model waveform Wm1 of graph f1. /4, 1/6, 1/6 and 1/2 are shown.

By comparing the waveform Wd of the detection signal when the disconnection Dp is superimposed in the vicinity of a plurality of places on the wire rope W, and the model waveform Wm obtained by adding waveforms corresponding to the number of disconnections Dp, the wire rope W It is possible to acquire the distribution information of the disconnection Dp of . For example, as shown in FIG. 7, when a model waveform Wm2 obtained by adding three detection signals and a waveform Wd of a detection signal having a high degree of approximation are obtained, there are three disconnections Dp in the wire rope W ( are superimposed). Further, when the waveform Wd of the detection signal is obtained, which is highly similar to the waveform Wd6 of the model waveform Wm obtained by adding 12 waveforms, the wire rope W has 12 consecutive disconnections Dp. It can be seen that there is (overlapping).

Therefore, in the first embodiment, the control unit 22 uses a model waveform Wm that indicates the waveform of the detection signal when the disconnection Dp occurs in the wire rope W. (Distribution information of disconnection Dp) is acquired. Specifically, the control unit 22 is configured to acquire at least the wire breakage Dp occurring in the wire rope W based on the model waveform Wm and the detection signal. More specifically, the control unit 22 is configured to acquire distribution information of at least wire breaks Dp superimposed on the wire rope W based on the model waveform Wm, the detection signal, and the position information. The control unit 22 is configured to use the difference value of the detection signal acquired by the differential coil 34 as the detection signal. Since the shape of the waveform Wd of the detection signal differs depending on the distribution and number of wire breaks Dp, the model waveform Wm used by the control unit 22 is the waveform Wd of the detection signal when one wire breakage Dp occurs in the wire rope W. It is constructed so as to be a model of a waveform used as a reference waveform for superimposition.

In the first embodiment, the magnetic material inspection apparatus 100 is configured on the assumption that the wire rope W is inspected at predetermined intervals R, as shown in FIG. The control unit 22 acquires the distribution information of the disconnection Dp using the detection signal detected from the wire rope W at each predetermined interval R. In addition, the control unit 22 discretizes the wire rope W by a predetermined number at a predetermined interval R, and obtains whether or not the disconnection Dp has occurred based on the detection signal in each discretized section _xi . The example shown in FIG. 8 shows an example in which the predetermined interval R is discretized into 10 equal parts. That is, in the example shown in FIG. 8, the predetermined interval R is discretized into 10 equally divided sections x1 to x10, and it is checked whether or not there is a disconnection Dp in each section _xi .

ここで、ｈ_ｉ（ｘ）は、断線Ｄｐが１か所の場合のモデル波形Ｗｍである。また、Ｈ（ｘ）は、断線Ｄｐが複数か所の場合のモデル波形Ｗｍである。また、ｘは、ワイヤロープＷにおける検知コイル３０の位置である。また、ｘ_ｉは、離散化したワイヤロープＷにおける、断線Ｄｐ（傷み）が生じた位置（区画）である。また、Ｍ_ｉは、断線Ｄｐ（傷み）が生じた位置における検知信号の強度である。なお、ｈ_ｉ（ｘ）およびＨ（ｘ）は、それぞれ、特許請求の範囲の「モデル関数」の一例である。 Assuming that the model waveform Wm when there is one wire breakage Dp is expressed by the following equation (1), the model waveform Wm when wire breaks Dp are superimposed at a plurality of locations can be expressed by the following equation (2). .

Here, h _i (x) is the model waveform Wm when there is one disconnection Dp. H(x) is a model waveform Wm in the case where there are multiple disconnections Dp. Also, x is the position of the sensing coil 30 on the wire rope W. FIG. Also, _xi is the position (section) where the breakage Dp (damage) occurs in the wire rope W that has been digitized. Moreover, M _i is the intensity of the detection signal at the position where the disconnection Dp (damage) occurs. Note that h _i (x) and H(x) are examples of the "model function" in the claims.

Here, in the first embodiment, the following formula (3) is used as h _i (x). Note that Equation (3) is a model function obtained based on the waveform Wd1 of the detection signal when there is one disconnection Dp.

As shown in Equation (3), the model waveform Wm is a model of the position x _i of the detection unit 3 (detection coil 30) when the detection signal is detected in the wire rope W and the strength M _i of the detection signal. It is a function-based model of waveforms.

Further, as shown in the above equation (2), the model waveform Wm is a waveform model based on a function obtained by adding model functions when a plurality of disconnections Dp are separated and superimposed on the wire rope W. That is, the model waveform Wm is a waveform model based on a function obtained by adding the model functions in each section _xi for the number of sections _xi .

ここで、ｒ（ｘ）は、誤差関数である。また、ｙ（ｘ）は、検知信号の実測値である。 In the first embodiment, the control unit 22 is configured to acquire the disconnection Dp of the wire rope W based on the degree of approximation between the shape of the waveform Wd of the acquired detection signal and the shape of the model waveform Wm. . Specifically, the control unit 22 is configured to acquire the disconnection Dp of the wire rope W by analyzing the waveform Wd of the detection signal and the model waveform Wm by the method of least squares. The control unit 22 obtains the disconnection _Dp of the wire rope W by using the following equation (4) as an error function and obtaining the intensity Mi of the detection signal that minimizes the square of the error function.

where r(x) is the error function. Also, y(x) is the measured value of the detection signal.

The control unit 22 can acquire the distribution information of the disconnection Dp (damage) in the wire rope W by acquiring the intensity Mi of the model waveform _Wm that minimizes the square of the error function.

(Distribution information acquisition processing of disconnection of wire rope)
Next, with reference to FIG. 9, the flow of processing for the magnetic material inspection apparatus 100 to acquire the distribution information of the disconnection Dp of the wire rope W will be described.

In step S<b>1 , the control unit 22 acquires detection signal data based on changes in the total magnetic flux of the wire rope W detected by the detection unit 3 including the detection coil 30 . After that, the process proceeds to step S2.

In step S<b>2 , the control unit 22 acquires the position information of the detection unit 3 when detecting the detection signal of the wire rope W stored in the storage unit 23 . After that, the process proceeds to step S3.

In step S3, the control unit 22 acquires at least the distribution information of the disconnection Dp (damage) of the wire rope W based on the model waveform Wm representing the waveform Wd of the detection signal data, the detection signal data, and the position information. End the process.

In the first embodiment, the control unit 22 is configured to display the acquired distribution information of the breakage Dp (damage) of the wire rope W on the display unit 24 .

(Effect of the first embodiment)
The following effects can be obtained in the first embodiment.

In the first embodiment, as described above, the magnetic material inspection apparatus 100 includes the detection coil 30 that detects changes in the total magnetic flux of the wire rope W, the detection unit 3 that outputs a detection signal, and the wire rope W that detects disconnection. A storage unit 23 that stores a model waveform Wm of a wire breakage Dp representing a waveform Wd of a detection signal when Dp (damage) occurs, and a wire breakage superimposed on at least the wire rope W based on the model waveform Wm and the detection signal. and a control unit 22 that acquires Dp. As a result, the disconnection Dp superimposed on the wire rope W can be acquired from the model waveform Wm and the waveform Wd of the detection signal. As a result, the magnetic material inspection device 100 capable of acquiring the disconnection Dp superimposed on the wire rope W can be provided. Moreover, by superimposing the model waveform Wm, it is possible to generate a model of the waveform Wd of the detection signal when the disconnection Dp occurs at various positions of the wire rope W. By comparing , the wire breakage Dp superimposed on the wire rope W can be obtained.

In addition, as described above, the first embodiment further includes the position information acquisition unit 46 that acquires the position information of the detection unit 3 when the detection signal of the wire rope W is detected. And, based on the detection signal and the position information, at least the distribution information of the disconnection Dp superimposed on the wire rope W is acquired. As a result, based on the distribution information of the wire breakage Dp of the wire rope W, the localization of the wire breakage Dp of the wire rope W can be grasped. As a result, it becomes possible to grasp a partial decrease in the mechanical strength of the wire rope W, and to grasp the replacement timing of the wire rope W.

Further, in the first embodiment, as described above, the model waveform Wm depends on the position information (position x _i ) of the detection unit 3 when the detection signal is detected in the wire rope W and the intensity M _i of the detection signal. It is a waveform model based on a model function. By using such a model waveform Wm, by changing the position _xi where the wire breakage Dp occurs in the model waveform Wm and the intensity Mi of the detection signal at the position where the _wire breakage Dp occurs, the waveform that serves as a reference for superimposition pattern can be increased with different positions and intensities, it is possible to obtain model waveforms Wm of various patterns. As a result, it is possible to acquire the model waveform Wm that best matches the waveform Wd of the detection signal from among the model waveforms Wm of various patterns. can be improved.

Further, in the first embodiment, as described above, the model waveform Wm is a waveform model based on a function obtained by adding model functions when a plurality of disconnections Dp are superimposed in the wire rope W at a distance. . As a result, model waveforms Wm that can correspond to detection signals of various patterns can be easily constructed by adding model functions when disconnection Dp (damage) is superimposed at various positions.

Further, in the first embodiment, as described above, the control unit 22 acquires the disconnection Dp of the wire rope W based on the degree of approximation between the shape of the waveform Wd of the acquired detection signal and the shape of the model waveform Wm. is configured to Accordingly, by obtaining the degree of approximation, it is possible to obtain the model waveform Wm that is most similar to the waveform of the detection signal. As a result, it is possible to obtain the disconnection Dp of the wire rope W from the model waveform Wm that is most similar to the waveform of the detection signal, so that the disconnection Dp of the magnetic material can be obtained from the detection signal.

Further, in the first embodiment, as described above, the control unit 22 acquires the wire breakage Dp of the wire rope W by analyzing the waveform Wd of the detection signal and the model waveform Wm by the method of least squares. It is configured. Thereby, the degree of approximation between the waveform Wd of the detection signal and the model waveform Wm can be easily obtained by the method of least squares. As a result, the disconnection Dp of the wire rope W can be easily obtained.

Further, in the first embodiment, as described above, the detection coil 30 includes a pair of differential coils 34, and the control unit 22 controls the difference value of the detection signals detected by each of the pair of differential coils 34. is acquired, and at least the wire breakage Dp of the wire rope W is acquired based on the acquired difference value and the model waveform Wm. As a result, noise is canceled by the differential coil 34 to obtain a detection signal with less noise, and the disconnection Dp of the magnetic material can be obtained based on the waveform Wd of the detection signal with less noise. can be obtained, the wire breakage Dp of the wire rope W can be obtained with higher accuracy.

Further, in the first embodiment, as described above, the magnetic field application unit 5 is further provided for adjusting the magnetization direction of the wire rope W before the detection signal is detected by the detection unit 3 . As a result, the magnetization direction of the wire rope W can be adjusted by the magnetic field applying unit 5 before the change in the total magnetic flux of the wire rope W is detected by the detection unit 3. It is possible to suppress the influence of noise caused by this. As a result, since the influence of noise is suppressed, it is possible to accurately detect individual wire breakages Dp occurring in the wire rope W, and the wire breakage Dp of the wire rope W can be obtained with even higher accuracy.

Further, in the first embodiment, as described above, the magnetic material inspection method includes step S1 of acquiring detection signal data based on changes in the total magnetic flux of the wire rope W detected by the detection unit 3 including the detection coil 30; , a step S2 of acquiring position information of the detection unit 3 when the detection signal data of the wire rope W is detected, a model waveform Wm representing the waveform Wd of the detection signal data, the detection signal data, and the position information. , and a step S3 of acquiring at least the breakage Dp of the wire rope W. A magnetic material inspection method capable of acquiring a break Dp of the wire rope W thereby.

[Second embodiment]
Next, a magnetic material inspection apparatus 200 (see FIG. 1) according to a second embodiment will be described with reference to FIGS. 1, 10 and 11. FIG. Unlike the first embodiment that inspects the wire rope W in which a plurality of wire breaks Dp are spaced apart and superimposed, in the second embodiment, the magnetic material inspection apparatus 200 acquires the wire breaks Dp superimposed on the same area SA of the wire rope W. is configured to In addition, the same code|symbol is attached|subjected about the structure similar to the said 1st Embodiment, and description is abbreviate|omitted.

As shown in FIG. 1, in the second embodiment, the magnetic material inspection device 200 includes a control section 25. As shown in FIG. The control unit 25 is configured to acquire the number of wire breaks Dp superimposed on the same area SA (see FIG. 10) of the wire rope W. As shown in FIG.

FIG. 10 is a schematic diagram of a case in which a plurality of disconnections Dp are superimposed on the same area SA of the wire rope W. As shown in FIG. In the second embodiment, the magnetic material inspection apparatus 200 inspects the wire rope W in the case where a plurality of strands Ws of the wire rope W are broken Dp in the same region SA of the wire rope W. FIG. Specifically, as shown in FIG. 10, the magnetic material inspection apparatus 200 inspects the wire rope W in which the disconnection Dp of each of the three wires Ws occurs in the same area SA. In the second embodiment, for the sake of simplicity, it is assumed that the signal intensity of the detection signal detected from the disconnection Dp of each strand Ws is the same as the signal intensity of the model waveform Wm.

FIG. 11A is a graph f1 representing the detection signal of the model waveform Wm when one wire breakage Dp occurs in one wire Ws. FIG. 11B is a graph f7 showing a waveform Wd7 of the detection signal of the wire rope W in which the disconnection Dp of each of the three strands Ws overlaps in the same area SA.

The inventors of the present invention have found that detection signals are added together when a plurality of disconnections Dp are superimposed in the same area SA. Specifically, the inventors of the present invention found that the amplitude A2 of the detection signal when a plurality of disconnections Dp are superimposed in the same area SA is an integer of the amplitude A1 of the model waveform Wm according to the number of disconnections Dp. I have found that it doubles. Based on the above findings, the inventors of the present invention found that the number of disconnections Dp in the same area SA can be obtained by obtaining the difference in the signal strength of the detection signal with respect to the signal strength of the model waveform Wm. . In the example shown in FIG. 11B, three disconnections Dp are superimposed on the same area SA, so the amplitude A2 of the detection signal is three times the amplitude A1 of the model waveform Wm.

The control unit 25 is configured to acquire the number of wire breaks Dp superimposed on the same region SA of the wire rope W based on the difference in the signal intensity of the detection signal with respect to the signal intensity of the model waveform Wm. In the second embodiment, the controller 25 acquires the number of wire breaks Dp superimposed on the same region SA of the wire rope W based on the ratio between the amplitude A1 of the model waveform Wm and the amplitude A2 of the detection signal. It is configured. Note that the control unit 25 is configured to acquire the number of wire breaks Dp superimposed on the same region SA of the wire rope W based on factors other than the ratio between the amplitude A1 of the model waveform Wm and the amplitude A2 of the detection signal. may For example, the control unit 15 may be configured to obtain the number of lines Dp superimposed on the same region SA of the wire rope W based on the difference between the amplitude A1 of the model waveform Wm and the amplitude A2 of the detection signal. good.

Next, with reference to FIG. 12, the flow of processing for acquiring the number of disconnections Dp superimposed on the same area SA of the wire rope W by the magnetic material inspection apparatus 200 will be described. It should be noted that the description of steps that are the same as in the first embodiment will be omitted.

In step S1, the controller 25 acquires detection signal data of the wire rope W. FIG. After that, the process proceeds to step S4.

In step S4, the control unit 25 acquires the number of wire breaks Dp superimposed on the same region SA of the wire rope W based on the difference in signal intensity of the detection signal with respect to the signal intensity of the model waveform Wm, and ends the process.

Other configurations in the second embodiment are the same as those in the first embodiment.

(Effect of Second Embodiment)
In the second embodiment, as described above, the control unit 25 acquires the number of disconnections Dp superimposed on the same region SA of the wire rope W based on the difference in the signal intensity of the detection signal with respect to the signal intensity of the model waveform Wm. is configured to As a result, it is possible to obtain the number of wire breaks Dp based on the signal strength of the detection signal. The number of disconnections Dp of the wire rope W in the area where the detection signal exceeds the threshold can be accurately grasped, compared to the case of detecting whether or not. As a result, it is possible to accurately ascertain the number of wire breaks Dp superimposed on the wire rope W, so that it is possible to accurately ascertain when the wire rope W should be replaced.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the above description of the embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the above-described first and second embodiments, the magnetic material inspected by the magnetic material inspection apparatus 100 (200) is the wire rope W, but the present invention is not limited to this. For example, the magnetic material to be inspected by the magnetic material inspection apparatus 100 (200) may be a magnetic material other than the wire rope W.

Moreover, although the magnetic material inspection apparatus 100 (200) showed the example provided with the magnetic field application part 5 in the said 1st and 2nd embodiment, this invention is not limited to this. The magnetic material inspection device 100 ( 200 ) does not have to include the magnetic field applying section 5 . However, in the case of the configuration without the magnetic field applying unit 5, the detection accuracy of the disconnection Dp (damage) of the wire rope W decreases due to the influence of noise. A configuration with 5 is preferred.

Further, in the above-described first and second embodiments, an example in which the magnetic material inspection device 100 (200) inspects the wire rope W provided in the elevator E was shown, but the present invention is not limited to this. In the present invention, for example, the magnetic material inspection device 100 (200) may be used to inspect wire ropes W used in cranes, suspension bridges, robots, and the like.

Further, in the first and second embodiments, the magnetic flux of the wire rope W is measured while moving the wire rope W in the X direction while the magnetic material inspection device 100 (200) is fixed to the wire rope W. Although an example is shown, the present invention is not limited to this. For example, when the wire rope W itself does not move, such as the wire rope W used in a suspension bridge, the magnetic material inspection is performed while moving the wire rope W in the X direction with respect to the magnetic material inspection apparatus 100 (200). The magnetic flux of the wire rope W may be measured by the device 100 (200).

なお、Ｎ_ｉは断線Ｄｐ（傷み）が生じた位置における検知信号の強度である。 Further, in the above-described first and second embodiments, an example is shown in which the detection unit 3 includes the differential coil 34 having the pair of receiving coils 11 and 12, but the present invention is not limited to this. For example, the detection unit 3 may include a detection coil 30 composed of a single coil. When the magnetic flux of the wire rope W (magnetic body) is detected by the detection coil 30 composed of a single coil, the disconnection Dp of the magnetic body can be obtained from the model waveform Wm according to the following equation (5). good.

Note that Ni is the intensity of the detection signal at the position where the disconnection _Dp (damage) occurs.

Further, in the above-described first and second embodiments, an example in which the control unit 22 analyzes the detection signal by the method of least squares was shown, but the present invention is not limited to this. For example, the control unit 22 may be configured to analyze the detection signal by maximum likelihood estimation. Further, for example, waveforms of all patterns of the waveform Wd of the detection signal as shown in FIG. By pattern matching the waveform Wd of the signal and each waveform stored in the storage unit 23, the distribution information of the disconnection Dp (damage) of the wire rope W may be obtained.

Further, in the above-described first and second embodiments, an example in which the control unit 22 acquires the wire breakage Dp as damage to the wire rope W was shown, but the present invention is not limited to this. For example, the control unit 22 may be configured to acquire distribution information of foreign matter adhesion as damage to the wire rope W. FIG. When a foreign object adheres to the wire rope W, the waveform Wd of the detection signal becomes a waveform Wdf as shown in FIG. That is, the waveform Wdf of the detection signal when a foreign object is attached to the wire rope W has a polarity different from the waveform Wd of the detection signal when the wire rope W is broken Dp. Therefore, different types of damage can be detected according to the shape of the waveform Wd of the detection signal. In the example shown in FIG. 13, for the sake of convenience, the waveform Wd (Wdf) of the detection signal is shown as a waveform acquired in an ideal state without noise.

Further, in the above-described first and second embodiments, an example in which the magnetic material inspection device 100 (200) transmits detection information to the analysis unit 2 was shown, but the present invention is not limited to this. For example, as shown in FIG. 14, the magnetic material inspection unit 1 may be configured to transmit detection information to the server Sv on the cloud CL. When the magnetic material inspection unit 1 transmits the detection information to the server Sv, the server Sv may be configured to acquire the disconnection Dp of the wire rope W. FIG. The user may obtain the disconnection Dp of the wire rope W by accessing the server Sv on the cloud CL using his or her personal computer P.

Moreover, although the magnetic material inspection apparatus 100 (200) showed the example provided with the analysis part 2 in the said 1st and 2nd embodiment, this invention is not limited to this. The magnetic material inspection device 100 ( 200 ) does not have to include the analysis section 2 . For example, if the magnetic material inspection apparatus 100 (200) does not include the analysis unit 2, the inspection control unit 41 may be configured to acquire the disconnection Dp of the wire rope W.

Moreover, although the detection part 3 showed the example provided with the excitation coil 33 in the said 1st and 2nd embodiment, this invention is not limited to this. For example, if the wire rope W and the magnetic material inspection device 100 (200) are configured to move relative to each other, the detector 3 may not include the excitation coil 33 .

Further, in the above-described first and second embodiments, an example in which the control unit 22 (25) acquires the difference value based on the detection signal of the differential coil 34 is shown, but the present invention is not limited to this. For example, the inspection control section 41 may be configured to acquire the difference value based on the detection signal of the differential coil 34 .

Further, in the first and second embodiments, the magnetic material inspection device 100 (200) supplies the analysis unit 2 with the position information when the disconnection Dp of the wire rope W is detected and the detection coil 30 (differential An example has been shown in which the detection information associated with the total magnetic flux of the wire rope W detected by the coil 34) is transmitted, but the present invention is not limited to this. For example, the magnetic material inspection apparatus 100 ( 200 ) may be configured to acquire a detection signal in the inspection control unit 41 and transmit detection information in which the detection signal and position information are associated with each other to the analysis unit 2 .

Further, in the above-described first and second embodiments, an example of a configuration in which the magnetic material inspection device 100 (200) includes the position information acquisition unit 46 is shown, but the present invention is not limited to this. If only the number of disconnections Dp of the wire rope W is obtained from the waveform Wd of the detection signal, the position information obtaining section 46 may not be provided.

In addition, in the above-described two embodiments, when a plurality of disconnections Dp superimposed on the same area SA of one wire rope W are detected, an example of a configuration in which detection signals are added is shown. Not limited. For example, the magnetic material inspection device 200 may be used to detect wire breaks Dp occurring in a plurality of wire ropes W. FIG. Even when detecting a plurality of wire ropes W, an added detection signal can be obtained. As shown in FIG. 15(A), when disconnection Dp (disconnection Dp1 and Dp2) occurring in two wire ropes W (wire ropes W1 and W2) is detected at once, waveform Wd9 of the detection signal obtained is shown in FIG. It becomes like the graph f8 shown to 15(B). As shown in graph f8, when wire breakages Dp occurring in a plurality of wire ropes W are detected at once, peaks of amplitude A3 and amplitude A4 appear at the respective wire breakage Dp positions. Note that the example shown in FIG. 15B is an example in which the amplitude A4 of the detection signal for the disconnection Dp2 is twice as large (intensity) as the amplitude A3 of the detection signal for the disconnection Dp1.

FIG. 16A shows an example in which the positions of wire breaks Dp (wire breaks Dp1 and Dp2) occurring in a plurality of wire ropes W (wire ropes W1 and W2) are within the same region SA. When the positions of the wire breaks Dp occurring in a plurality of wire ropes W are within the same area SA, the waveforms Wd10 of the obtained detection signals are added as shown in the graph f9 shown in FIG. 16(B). Therefore, even when the position of the wire breakage Dp in a plurality of wire ropes W is within the same area SA, the detection signal is added. You can get the number.

Further, in the second embodiment, the magnetic material inspection apparatus 200 has shown an example of a configuration for detecting the addition of the detection signals when the strengths of the detection signals of the disconnection Dp are equal, but the present invention is limited to this. can't For example, as shown in FIG. 15B, the magnetic material inspection apparatus 200 detects the added detection signal even when the amplitude A3 of the detection signal for the disconnection Dp1 and the amplitude A4 of the detection signal for the disconnection Dp2 are different. be able to. When the disconnection Dp1 and the disconnection Dp2 are in the same area SA as shown in FIG. 16A, the amplitude A5 of the waveform Wd10 of the obtained detection signal is The magnitude (strength) is the sum of the amplitude A3 of the detection signal for the disconnection Dp1 and the amplitude A4 of the detection signal for the disconnection Dp2.

Further, in the above-described second embodiment, an example of a configuration in which the magnetic material inspection device 200 detects the number of disconnections Dp of the strands Ws of the wire rope W has been described, but the present invention is not limited to this. For example, the magnetic material inspection apparatus 200 may be configured to detect the number of damages on the wire rope W other than the breakage Dp of the wire Ws, such as damages on one surface and damages on the other surface of the wire rope W. good.

3 detection unit 5 magnetic field application unit 22, 25 control unit 23 storage unit 30 detection coil 34 differential coil 41 inspection control unit (control unit)
46 Position information acquisition unit 100, 200 Magnetic material inspection device Dp Disconnection (damage to magnetic material)
h _i (x), H(x) model function M _i intensity of detection signal at position where damage is superimposed x _i position information of detection unit W wire rope (magnetic material)
Wd Detection signal waveform Wm Model waveform

Claims (10)

a detection unit that includes a detection coil that detects changes in the total magnetic flux of the wire rope and that outputs a detection signal;
a storage unit for storing a model waveform of wire breakage corresponding to the waveform of the detection signal when one wire breakage occurs in the wire rope;
A wire rope inspection device, comprising: a control unit that acquires at least information about the number of breaks in strands superimposed on the wire rope based on the model waveform and the detection signal. wherein the control unit is configured to acquire the number of wire breaks in the wires superimposed on the same region of the wire rope based on a difference in signal intensity of the detection signal with respect to signal intensity of the model waveform. Item 1. The wire rope inspection device according to Item 1. further comprising a position information acquisition unit that acquires position information of the detection unit when the detection signal of the wire rope is detected,
2. The control unit is configured to acquire at least distribution information of disconnection of wires superimposed on the wire rope based on the model waveform, the detection signal, and the position information. Or the wire rope inspection device according to 2. 4. The model waveform according to claim 3, wherein the model waveform is a waveform model based on a model function based on the position information of the detection unit when the detection signal is detected in the wire rope and the strength of the detection signal. Wire rope inspection equipment. 5. The wire rope inspection according to claim 4, wherein the model waveform is a waveform model based on a function obtained by adding the model functions in the case where a plurality of wire breaks in the wire rope are separated and overlapped. Device. wherein the control unit is configured to acquire the number of breaks in the wires of the wire rope based on the degree of approximation between the acquired waveform shape of the detection signal and the shape of the model waveform. The wire rope inspection device according to any one of items 1 to 5. 7. The control unit according to claim 6, wherein the control unit is configured to acquire the number of wire breaks in the wires of the wire rope by analyzing the waveform of the detection signal and the model waveform by a least-squares method. A wire rope inspection device as described. the sensing coil includes a pair of differential coils;
The control unit obtains a difference value between the detection signals detected by each of the pair of differential coils, and based on the obtained difference value and the model waveform, determines at least the strands of the wire rope. The wire rope inspection device according to any one of claims 1 to 7, configured to acquire the number of breaks . The wire rope inspection apparatus according to any one of claims 1 to 8, further comprising a magnetic field application section that adjusts the magnetization direction of the wire rope before the detection of the detection signal by the detection section. obtaining detection signal data based on changes in the total magnetic flux of the wire rope detected by a detection unit including a detection coil;
A wire rope inspection method comprising: a model waveform representing a waveform of the detection signal data; and obtaining information about the number of wire breaks in at least the wire rope superimposed on the wire rope based on the detection signal data.

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