Wire rope inspection system and wire rope inspection method

Abstract

To provide a wire rope inspection system and a wire rope inspection method, capable of accurately determining a defect of a wire rope through discriminating a peak waveform resulting from the defect of the wire rope and a peak waveform resulting from a state other than the defect of the wire rope.SOLUTION: A wire rope inspection system 100 includes a wire rope inspection device 101, and a processing unit 102 configured to determine a defect of a wire rope W. The wire rope inspection device 101 includes an excitation part 20 and a detector 30 configured to obtain a detection signal. The processing unit 102 obtains a differential waveform 1 through executing differential processing on the basis of a difference in signal values at different locations of a test object to a signal waveform based on a detection signal obtained by the detector 30, and determines whether or not a defect is present in the wire rope W on the basis of a height 2 of the peak waveform and a width 4 of the peak waveform in the obtained differential waveform 1.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a wire rope inspection system and a wire rope inspection method. [Background technology]

[0002] 2. Description of the Related Art A wire rope inspection system is known in the art (see, for example, Patent Document 1).

[0003] The eddy current flaw detector (wire rope inspection system) described in the above Patent Document 1 includes an excitation coil, a detection coil, and a controller. The excitation coil is configured to apply a magnetic field to the wire rope in the longitudinal direction of the wire rope. The detection coil is configured to detect leakage magnetization in the longitudinal direction of the wire rope generated from the wire rope and output a detection signal. The controller is configured to determine defects in the wire rope based on the presence or absence of a peak waveform based on the detection signal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-302379 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, the inventor of the present application has found that, for example, in the inspection of a wire rope that has been in use for a long time, in a portion of the wire rope corresponding to a position where the height of the peak waveform based on the generated signal waveform is high, there are cases where the wire rope has a defect such as a broken wire, and cases where the above defect does not occur. That is, the inventor of the present application has found that even in a portion of the wire rope where the above defect does not occur, a peak waveform may be detected as the same as in a portion where the above defect occurs. And, the inventor of the present application has found a problem that it is difficult to distinguish whether a detected peak waveform is a peak waveform caused by a defect in the wire rope or a peak waveform caused by a state other than the defect in the wire rope. Therefore, it is desired to accurately determine the defect in the wire rope by distinguishing between a peak waveform caused by a defect in the wire rope and a peak waveform caused by a state other than the defect in the wire rope.

[0006] The present invention has been made to solve the problems described above, and one object of the present invention is to provide a wire rope inspection system and a wire rope inspection method that are capable of accurately determining wire rope defects by distinguishing between peak waveforms caused by wire rope defects and peak waveforms caused by conditions other than wire rope defects. [Means for solving the problem]

[0007] A wire rope inspection system in a first aspect of the present invention includes a wire rope inspection device that detects changes in magnetic flux of a wire rope to be inspected, and a processing device that determines whether or not there is a defect in the wire rope based on the measurement results of the wire rope by the wire rope inspection device.The wire rope inspection device includes an excitation unit that applies a magnetic field to the wire rope, and a detection unit that acquires a detection signal by detecting changes in magnetic flux of the wire rope to which a magnetic field has been applied by the excitation unit while moving relative to the wire rope.The processing device acquires a differential waveform by performing differential processing on a signal waveform based on the detection signal acquired by the detection unit based on the difference in signal values ​​at different positions of the inspection object, and determines whether or not there is a defect in the wire rope based on the height and width of the peak waveform in the acquired differential waveform.

[0008] A wire rope inspection method in a second aspect of the present invention includes the steps of applying a magnetic field to a wire rope to be inspected, acquiring a detection signal by detecting changes in the magnetic flux of the wire rope to which the magnetic field is applied while moving relative to the wire rope, acquiring a differential waveform by performing differential processing on a signal waveform based on the acquired detection signal based on the difference in signal values ​​at different positions of the inspection object, and determining whether or not there is a defect in the wire rope based on the height and width of the peak waveform in the acquired differential waveform. Effect of the Invention

[0009] The inventors of the present application focused on not only the height of the peak waveform but also the width of the peak waveform in a differential waveform obtained by differentially processing a signal waveform based on a detection signal from a detection coil that detects changes in the magnetic flux of the wire rope. As a result of extensive research, the inventors of the present application found that it is possible to accurately determine whether or not the wire rope is defective by using both the height of the peak waveform in the differential waveform obtained by differentially processing the signal waveform and the width of the peak waveform in the differential waveform, and arrived at the present invention.

[0010] That is, in the wire rope inspection system in the first aspect and the wire rope inspection method in the second aspect, a differential waveform is obtained by performing differential processing based on the difference between signal values ​​at different positions of the inspection target for a signal waveform based on the acquired detection signal, and whether or not there is a defect in the wire rope is determined based on the height and width of the peak waveform in the acquired differential waveform. This makes it possible to distinguish between peak waveforms caused by wire rope defects and peak waveforms caused by conditions other than wire rope defects based on the height and width of the peak waveform in the differential waveform. Therefore, it is possible to accurately determine wire rope defects. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram showing an overview of a wire rope inspection system according to one embodiment. [Diagram 2] 1 is a block diagram showing an overall configuration of a wire rope inspection system according to one embodiment. [Diagram 3] 1 is a diagram showing the arrangement of a magnetic adjustment unit, a magnetic excitation unit, and a detection unit in a wire rope inspection device according to one embodiment. FIG. [Figure 4] 3 is a schematic diagram for explaining the configuration of a detector coil of a detection unit; FIG. [Diagram 5] FIG. 13 is a diagram showing an example of a differential waveform. [Figure 6] FIG. 13 is a diagram for explaining an example of a peak waveform at a portion where a defect occurs in a wire rope. [Figure 7] FIG. 13 is a diagram for explaining an example of a peak waveform of a portion of a wire rope in a state other than a defect. [Figure 8] 11A and 11B are diagrams for explaining the height and width of a peak waveform in a differential waveform. [Figure 9] FIG. 13 is a diagram for explaining differential processing. [Figure 10] FIG. 11 is a diagram showing the relationship between the effective height and half-width of a peak waveform and the determination result of whether or not there is a defect in the wire rope. [Figure 11]FIG. 11 is a diagram showing the peak waveform of (A) shown in FIG. [Figure 12] FIG. 11 is a diagram showing the peak waveform of (C) shown in FIG. [Figure 13] FIG. 11 is a diagram showing the peak waveform of (D) shown in FIG. [Figure 14] 1 is a flowchart for explaining a wire rope inspection process according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[0013] (Wire rope inspection system configuration) The configuration of a wire rope inspection system 100 according to the present embodiment will be described with reference to Fig. 1 to Fig. 13. In the following description, "orthogonal" means intersecting at an angle of 90 degrees or an angle close to 90 degrees.

[0014] As shown in FIG. 1, the wire rope inspection system 100 includes a wire rope inspection device 101 and a processing device 102. The wire rope inspection device 101 detects changes in magnetic flux in the wire rope W to be inspected. The wire rope inspection device 101 is configured to transmit the measurement results measured by detecting the changes in magnetic flux in the wire rope W to the processing device 102. The processing device 102 executes a process for determining whether or not the wire rope W is defective based on the measurement results of the wire rope W by the wire rope inspection device 101. The processing device 102 also displays the results of the determination of defects in the wire rope W by the wire rope inspection device 101, etc.

[0015] Here, in this specification, the "defect of the wire rope W" means, for example, a break in a wire of the wire rope W and a kink in the wire rope W. A kink in the wire rope W means a state in which the wire rope W has undergone irreparable plastic deformation, such as a twist or a knot-like bend, due to improper handling when the wire rope W is pulled out from a winding drum or the like or stretched.

[0016] In addition, in this specification, "a condition other than a defect in the wire rope W" refers to a distortion of the regular symmetry of the wires constituting the wire rope W, a disturbance in the magnetic properties caused by the stress caused by the operation of the elevator 103 being applied to the wire rope W, and a disturbance in the twist of the wire rope W. The disturbance in the twist of the wire rope W refers to a state in which the twist state of the wire rope W differs from the normal part due to, for example, a part of the wire material being unintentionally crossed and twisted when twisting the wire material.

[0017] Wire rope inspection system 100 inspects wire rope W installed in elevator 103. Wire rope inspection system 100 is also a system capable of checking defects in wire rope W that are difficult to check visually by a total magnetic flux method that measures magnetic flux inside wire rope W. Unlike methods that measure only leakage magnetic flux from defects on the surface of wire rope W, the total magnetic flux method is a method that can also measure defects inside wire rope W.

[0018] (Elevator configuration) As shown in FIG. 1, the elevator 103 includes a car room 103a, a sheave 103b, a sheave 103c, a control device 103d, and a wire rope W. The elevator 103 is configured to move the car room 103a carrying people and cargo in the vertical direction by rotating a sheave 103b (pulley) provided on a hoist to wind up the wire rope W. The elevator 103 is a rope-type elevator of a double wrap type (full wrap type) including two sheaves 103b and 103c. The double wrap type is a structure in which the wire rope W is looped around the sheave 103b twice by returning the wire rope W led from the sheave 103b of the hoist to the sheave 103c, which is a deflector, back to the sheave 103b of the hoist. The control device 103d includes a control panel that controls the operation of each part of the elevator 103. The control device 103d includes a wireless communication module and is configured to be able to communicate with the processing device 102.

[0019] The wire rope W is formed by weaving (for example, strand weaving) magnetic wire material, and is a magnetic body made of a long material. The wire rope W is inspected for condition (presence or absence of defects) by a wire rope inspection device 101 to prevent breakage due to deterioration. If the wire rope W is determined to have a degree of deterioration exceeding a predetermined standard as a result of measuring the magnetic flux of the wire rope W, it is replaced by an inspection operator. Note that, for convenience, only one wire rope W is shown in the example shown in FIG. 1, but the elevator 103 is equipped with multiple wire ropes W. For example, the elevator 103 is equipped with four wire ropes W.

[0020] The wire rope W is disposed so as to extend in the X direction (see FIG. 3) at the position of the wire rope inspection device 101. The wire rope inspection device 101 measures the magnetic flux of the wire rope W while moving along the surface of the wire rope W in the direction in which the wire rope W extends (X direction) relative to the wire rope W. In the case where the wire rope W itself moves, such as the wire rope W used in an elevator 103, the wire rope inspection device 101 measures the magnetic flux of the wire rope W while moving the wire rope W in the X2 direction. In this way, the wire rope inspection device 101 inspects damage to the wire rope W at each position in the X direction by measuring the magnetic flux at each position in the X direction of the wire rope W.

[0021] (Configuration of wire rope inspection device) 2 and 3, the wire rope inspection device 101 includes a magnetic adjustment unit 10, a magnetic excitation unit 20, a detection unit 30, and a control board 40. The wire rope inspection device 101 is disposed between the sheaves 103b and 103c of the elevator 103 so as to inspect the wire rope W.

[0022] The magnetic adjustment unit 10 adjusts the direction of magnetization of the wire rope W by applying a magnetic field to the wire rope W in advance. For example, the magnetic adjustment unit 10 is a permanent magnet. The magnetic adjustment unit 10 includes a pair of magnetic adjustment units 10a and 10b. The pair of magnetic adjustment units 10a and 10b are arranged on both sides of the short direction of the wire rope W (the direction perpendicular to the extension direction of the wire rope W, the Z direction) so as to sandwich the wire rope W. Specifically, the magnetic adjustment unit 10a is arranged on the Z1 direction side of the wire rope W. The magnetic adjustment unit 10b is arranged on the Z2 direction side of the wire rope W. The magnetic adjustment unit 10 is arranged such that the N pole (hatched) of the magnetic adjustment unit 10a facing the Z2 direction and the N pole (hatched) of the magnetic adjustment unit 10b facing the Z1 direction face each other across the wire rope W. The magnetic adjustment units 10a and 10b are configured to be capable of applying a relatively strong magnetic field in order to adjust the direction of magnetization of the wire rope W to a substantially uniform direction.

[0023] The excitation unit 20 is configured to apply a magnetic field (magnetic flux) to the wire rope W so as to excite (vibrate) the magnetized state of the wire rope W. Specifically, the excitation unit 20 includes an excitation coil 21. The excitation coil 21 is provided so as to wind all of the multiple (four) wire ropes W together along the direction in which the wire rope W extends (X direction). The excitation coil 21 is also provided so as to wind around the outside of the detection coils 31a and 31b of the detection unit 30 with respect to the wire rope W.

[0024] When an excitation AC current flows through the excitation coil 21, the excitation coil 21 generates a magnetic flux (magnetic field) inside the coil (inside the coil loop) along the extension direction (X direction) of the wire rope W. Specifically, an AC current (excitation current) having a constant magnitude and a constant frequency is caused to flow through the excitation unit 20 (excitation coil 21) under the control of a processing unit 41 of a control board 40 described later, and a magnetic field is applied so as to vibrate in the extension direction (X direction) of the wire rope W. That is, in the wire rope W, the magnetic field (magnetic flux) previously adjusted by the magnetic conditioning unit 10 is vibrated by the excitation unit 20 so that a magnetic field in the X1 direction and a magnetic field in the X2 direction appear periodically.

[0025] The detection unit 30 is configured to acquire a detection signal by detecting a change in the magnetic flux of the wire rope W to which a magnetic field has been applied (excited) so as to vibrate by the excitation unit 20 after a magnetic field has been applied in advance (after magnetization) by the magnetization unit 10 while moving relative to the wire rope W. In the wire rope inspection system 100 of this embodiment, the detection unit 30 detects the change in the magnetic flux of the wire rope W while moving relative to the wire rope W by detecting the change in the magnetic flux of the wire rope W moving in the X2 direction.

[0026] Specifically, the detection unit 30 includes a detector coil 31a disposed on one side (Z1 direction side) in a direction (Z direction) perpendicular to the extension direction (X direction) of the wire rope W, and a detector coil 31b disposed on the other side (Z2 direction side). The detector coils 31a and 31b are disposed so as to sandwich one wire rope W in a state in which the two coils surround it. The detector coils 31a and 31b are provided for each of the multiple (four) wire ropes W.

[0027] As shown in FIG. 4, the detector coils 31a and 31b are provided so as to be wound around the wire rope W along the direction in which the wire rope W extends. Specifically, the detector coils 31a and 31b are each an independent saddle-shaped coil. The detector coils 31a and 31b are each arranged so as to cover half a turn of the wire rope W. Therefore, the detector coils 31a and 31b are provided so as to wind the entire circumference of the wire rope W by combining the detector coils 31a and 31b along the direction in which the wire rope W extends (X direction). Also, the detector coils 31a and 31b are each formed of a conductor pattern provided on a flexible substrate. In this specification, the term "wind" is described as a concept including not only winding (wrapping) for one or more turns, but also winding for a number (angle) of one turn or less (for example, half a turn).

[0028] Each of the detector coils 31a and 31b is wound along the extension direction (X direction) of the wire rope W, and detects (measures) a change in magnetic flux that penetrates the inside of the coil along the extension direction (X direction) of the wire rope W. The detector coils 31a and 31b are configured to detect a change in magnetic flux (magnetic field) that is periodically changed over time by the excitation unit 20 (excitation coil 21). The detector coils 31a and 31b output a detection signal indicating the detected change in magnetic flux to a signal acquisition unit 42 (see FIG. 2) of the control board 40 described later.

[0029] The detector coil 31a and the detector coil 31b are differentially connected. In detail, by combining the detector coil 31a and the detector coil 31b, two coil loops in opposite directions are formed around the wire rope W on the X1 direction side and the X2 direction side, respectively. Then, the detection signal by the detector coil 31a and the detection signal by the detector coil 31b are combined to obtain a detection signal in which the changes in magnetic flux detected by the two coil loops in the opposite directions are combined. That is, the detector 30 is configured to obtain a detection signal by a differential coil by combining the detection signal by the detector coil 31a and the detection signal by the detector coil 31b.

[0030] As shown in FIG. 2, the control board 40 includes a processing unit 41, a signal acquisition unit 42, and a first communication unit 43. The control board 40 controls each unit of the wire rope inspection device 101 by the control processing by the processing unit 41. The processing unit 41 includes a processor such as a CPU (Central Processing Unit), a memory, and an AD converter. The control board 40 controls the operation of the excitation unit 20 (excitation coil 21) based on a control signal from the processing unit 41. The signal acquisition unit 42 acquires (receives) a detection signal from the detection unit 30 (detection coils 31a and 31b). The signal acquisition unit 42 includes an amplifier. The signal acquisition unit 42 amplifies the acquired detection signal and outputs (transmits) it to the processing unit 41. The first communication unit 43 is configured to be able to communicate with the processing device 102. The first communication unit 43 includes a wireless communication module capable of wireless communication by wireless LAN, Bluetooth (registered trademark), or the like. The first communication unit 43 outputs (transmits) the acquired detection signal to the processing device 102. The connection between the wire rope inspection device 101 and the processing device 102 via the first communication unit 43 may be a wired connection.

[0031] (Processing device configuration) 2, the processing device 102 includes a control unit 50, a storage unit 60, a touch panel 70, and a second communication unit 80. The processing device 102 is provided separately from the wire rope inspection device 101. The processing device 102 is, for example, a tablet terminal such as a tablet PC (Personal Computer) used by an inspection operator who inspects the wire rope W. Note that the processing device 102 is not limited to a tablet PC, and may be, for example, a device installed in a remote location such as a server device.

[0032] Here, the wire rope W and the detector coils 31a and 31b are arranged so as to be out of contact with each other. In order to prevent the wire rope W from coming into contact with the detector coils 31a and 31b even when the wire rope W provided in the elevator 103 swings, the detector coils 31a and 31b are arranged so as to be spaced apart from each other by a certain distance around the wire rope W. Therefore, due to the magnetic field strength being reduced due to the distance between the wire rope W and the detector coils 31a and 31b, a peak waveform may be detected in a portion of the wire rope W where there is no defect such as a broken wire or a kink, as in a portion where there is a defect in the wire rope W. For example, a disturbance in the magnetic properties or a disturbance in the twist of the wire rope W caused by the stress applied to the wire rope W due to the use of the elevator 103 is detected as a peak waveform. Note that even if a peak waveform based on the disturbance in the magnetic properties or the twist caused by the stress due to the use of the elevator 103 is detected, the wire rope W to be inspected can be used continuously if a peak waveform due to a broken wire or a kink is not detected.

[0033] 5 to 7 are diagrams for explaining an example of a peak waveform of a part of the wire rope W where a defect occurs and an example of a peak waveform of a part of the wire rope W in a state other than the defect. FIG. 5 is a diagram showing an example of a differential waveform 201 acquired by performing a differential processing to be described later on a signal waveform based on a detection signal acquired by the detection unit 30. FIG. 6 is a diagram showing a peak waveform of a part of the wire rope W where a defect occurs in an area 90 surrounded by a two-dot chain line in FIG. 5. FIG. 7 is a diagram showing a peak waveform of a part of the wire rope W in a state other than the defect in an area 91 surrounded by a one-dot chain line in FIG. 5. As shown in FIG. 7, a peak waveform is detected in the part of the wire rope W in a state other than the defect, similar to the part of the wire rope W where the defect occurs.

[0034] Therefore, the processing device 102 is configured to obtain a differential waveform 201 by performing differential processing on the signal waveform based on the detection signal obtained by the detection unit 30, and to determine whether or not there is a defect in the wire rope W based on the peak waveform height 202 (see FIG. 8) and peak waveform width 204 (see FIG. 8) in the obtained differential waveform 201. In detail, when the peak waveform height 202 in the differential waveform 201 is greater than the height threshold value 62 (see FIG. 2), the processing device 102 determines whether or not there is a defect in the wire rope W based on the peak waveform width 204 in the differential waveform 201.

[0035] 2, the control unit 50 controls each part of the processing device 102. The control unit 50 includes a processor such as a CPU, a memory, and the like. The control unit 50 executes a process of determining defects in the wire rope W, such as a broken wire, based on the measurement results (detection signals) of the wire rope W received via the second communication unit 80. Details of the defect determination process performed by the control unit 50 will be described later.

[0036] The storage unit 60 is, for example, a storage device including a flash memory. The storage unit 60 stores (preserves) information such as the acquired measurement results of the wire rope W and the results of the determination of defects in the wire rope W by the control unit 50. The storage unit 60 also stores a program 61 for determining defects in the wire rope W, a height threshold 62, a first width threshold 63, and a second width threshold 64.

[0037] The touch panel 70 displays information such as the measurement results of the wire rope W, and the analysis results (defect determination results) of the measurement results of the wire rope W by the control unit 50. The touch panel 70 also accepts input operations by an inspection operator.

[0038] The second communication unit 80 is configured to be able to communicate with the wire rope inspection device 101 and the control device 103d of the elevator 103. The second communication unit 80 is an interface for communication. Specifically, the second communication unit 80 includes a wireless communication module capable of wireless communication by wireless LAN, Bluetooth (registered trademark), and the like. The processing device 102 receives the measurement result (detection signal) of the wire rope W by the wire rope inspection device 101 via the second communication unit 80. In addition, when starting inspection of the wire rope W based on an input operation by an inspection operator, the processing device 102 transmits a signal indicating the start of inspection to the wire rope inspection device 101 and the elevator 103 (the control device 103d of the elevator 103) via the second communication unit 80.

[0039] The processing device 102 is configured to acquire a signal indicating the position of the wire rope W together with the acquired detection signal (measurement result). The processing device 102 is configured to store the detection signal in association with position information indicating the position of the wire rope W corresponding to the detection signal. The position information of the wire rope W may be acquired by a position sensor such as an encoder, or may be calculated based on the operating speed of the elevator 103 and the elapsed inspection time during which the inspection is performed.

[0040] (Defect determination process by processing device) Next, the process of determining whether or not there is a defect in the wire rope W by the processing device 102 will be described with reference to FIG. 2 and FIGS.

[0041] 2, the control unit 50 of the processing device 102 includes a waveform generating unit 51, a difference processing unit 52, a peak waveform detecting unit 53, and a judgment processing unit 54. Specifically, the control unit 50 as hardware is configured to include, as functional blocks of software (program 61), the waveform generating unit 51, the difference processing unit 52, the peak waveform detecting unit 53, and the judgment processing unit 54. The control unit 50 is configured to execute a process of judging a defect in the wire rope W by executing the program 61 based on the acquired detection signal.

[0042] Signal Waveform Generation Processing and Moving Average Processing The waveform generating unit 51 (control unit 50) generates a magnetic flux waveform, which is a signal waveform based on a detection signal acquired from the wire rope inspection device 101 (detection unit 30) via the second communication unit 80. The generated magnetic flux waveform is a collection of discrete detection signals acquired at each predetermined sampling period. Then, the waveform generating unit 5151 acquires a moving average waveform by performing moving average processing on the generated magnetic flux waveform in order to reduce electrical noise. The waveform generating unit 51 acquires the moving average waveform by performing moving average processing for each predetermined interval (for example, 16 samplings). Note that the above-mentioned predetermined interval is not limited to the interval of 16 samplings and can be set appropriately.

[0043] Differential Processing The difference processing unit 52 (control unit 50) performs difference processing on the acquired moving average waveform based on the difference between the signal values ​​at different positions of the wire rope W to be inspected, thereby acquiring a difference waveform 201 (see FIG. 8). As shown in FIG. 9, the difference processing unit 52 performs difference processing on the moving average waveform sequentially along the time axis (horizontal axis). For example, when performing difference processing at position a in the longitudinal direction of the wire rope W in the moving average waveform, the difference processing at position a is acquired by acquiring the difference between the value F(b) of the moving average waveform at position b a predetermined interval dt1 after position a and the value F(a) of the moving average waveform at position a. That is, when the value resulting from performing difference processing at position a is F′(a), the relationship F′(a)=F(b)−F(a) and b=a+dt1 is established. The predetermined interval dt1 is, for example, an interval corresponding to six samplings. The difference processing unit 52 performs difference processing sequentially for each sampling period along the time axis (horizontal axis) to acquire the difference waveform 201. The value of the differential waveform 201 is represented as F'(t). The above-mentioned predetermined section dt1 is not limited to a section of six samples, and can be set appropriately. Furthermore, the value of the differential waveform 201, F'(t), may be obtained as a value corresponding to the slope by dividing the value of F(b)-F(a) by dt1.

[0044] By performing differential processing on the acquired moving average waveform based on the difference in signal values ​​at different positions on the wire rope W being inspected, the parts of the moving average waveform where the signal value changes sharply can be more emphasized in the differential waveform 201.

[0045] <Processing for obtaining peak waveform height and width in differential waveform> 8, the peak waveform detection unit 53 (control unit 50) acquires the height 202 of the peak waveform in the differential waveform 201 based on the acquired differential waveform 201. In this embodiment, the height 202 of the peak waveform in the differential waveform 201 is the effective height 203 of the peak waveform. The effective height 203 of the peak waveform is the height from a value 203a based on the bottom of the valleys at both ends of the peak waveform to a value 203b based on the peak of the peak waveform.

[0046] Value 203a based on the bottom of the valley at both ends of the peak waveform is the average value of value 203c of differential waveform 201 at the bottom of the valley at one end of the peak waveform and value 203d of differential waveform 201 at the bottom of the valley at the other end of the peak waveform (the median value between value 203c of differential waveform 201 at one end and value 203d of differential waveform 201 at the other end). By setting value 203a based on the bottom of the valley at both ends of the peak waveform as the average value of value 203c of differential waveform 201 at the bottom of the valley at one end of the peak waveform and value 203d of differential waveform 201 at the bottom of the valley at the other end of the peak waveform, effective height 203 of the peak waveform can be set without relying too much on either value 203c of differential waveform 201 at the bottom of the valley at one end or value 203d of differential waveform 201 at the bottom of the valley at the other end.

[0047] The value 203b based on the peak of the peak waveform is the value of the peak top of the peak waveform, which is, for example, the apex of a result of fitting the signal value with a quadratic function.

[0048] That is, the effective height 203 of the peak waveform is the height from the average value of the value 203c of the differential waveform 201 at the bottom of the valley at one end of the peak waveform and the value 203d of the differential waveform 201 at the bottom of the valley at the other end of the peak waveform to the value of the peak top of the peak waveform. The peak waveform detection unit 53 sequentially acquires the effective heights 203 of the peak waveform in the differential waveform 201 along the time axis (horizontal axis).

[0049] Then, the peak waveform detection unit 53 acquires the peak waveform width 204 for the peak waveform whose effective height 203 is greater than the height threshold 62 (see FIG. 2). The peak waveform width 204 is the width 204 of the peak waveform at a height position within the range of the effective height 203 of the peak waveform. In this embodiment, the peak waveform width 204 in the differential waveform 201 is the half-width 205 of the effective height 203 of the acquired peak waveform.

[0050] <Determination Process> 10, the determination processing unit 54 (control unit 50) determines that the wire rope W is defective when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62 and the width 204 of the peak waveform in the differential waveform 201 is within a predetermined range. In this embodiment, the determination processing unit 54 (control unit 50) determines that the wire rope W is defective when the effective height 203 of the peak waveform in the differential waveform 201 is greater than the height threshold 62 and the half width 205 of the effective height 203 of the peak waveform is within a predetermined range. The predetermined range is a range in which the half width 205 is smaller than the first width threshold 63 and a range in which the half width 205 is larger than the second width threshold 64.

[0051] The height threshold 62, the first width threshold 63, and the second width threshold 64 are stored in advance in a storage unit. For example, the first width threshold 63 and the second width threshold 64 are set in advance based on the most frequent width of wire breaks and kinks, the distance between the wire rope W and the detection coils 31a and 31b, and a resolution based on waveform processing. For example, the first width threshold 63 is set to a value larger than the length based on a predetermined section dt1 in the difference processing and the length based on a predetermined section in the moving average processing.

[0052] In this embodiment, the height threshold 62 is set to "2.2". The first width threshold 63 is set to "12.5". The second width threshold 64 is set to "50.0". However, each of the height threshold 62, the first width threshold 63 and the second width threshold 64 is not limited to the above values.

[0053] The judgment processing unit 54 (control unit 50) is configured to judge that a wire of the wire rope W is broken as a defect in the wire rope W when the effective height 203 of the peak waveform is greater than the height threshold 62 and the half-width 205 at the effective height 203 of the peak waveform is in a range smaller than the first width threshold 63.

[0054] Then, in the above case, the determination processing unit 54 generates a determination result that the defect in the wire rope W is a wire break in the wire rope W. The generated determination result includes information that can identify the position of the wire rope W determined to be a wire break.

[0055] FIG. 11 is a diagram showing the peak waveform of (A) in FIG. 10. In the peak waveform shown in FIG. 11, the effective height 203 of the peak waveform is 4.5, which is greater than the height threshold value 62. In addition, the half-width 205 at the effective height 203 of the peak waveform is 8.5, which is in a range smaller than the first width threshold value 63. At the longitudinal position of the wire rope W where the peak waveform shown in FIG. 11 was acquired, a wire breakage of the wire rope W was confirmed by a palpable inspection by an inspector. In addition, at the longitudinal position of the wire rope W where other peak waveforms other than (A) shown in FIG. 10 were acquired where the effective height 203 of the peak waveform is greater than the height threshold value 62 and the half-width 205 at the effective height 203 of the peak waveform is in a range smaller than the first width threshold value 63, a wire breakage of the wire rope W was also confirmed by a palpable inspection by an inspector.

[0056] Furthermore, as shown in (B) of Figure 10, the judgment processing unit 54 (control unit 50) is configured to judge that a kink in the wire rope W is a defect in the wire rope W when the effective height 203 of the peak waveform is greater than the height threshold 62 and the half-width 205 at the effective height 203 of the peak waveform is in a range greater than a second width threshold 64 that is greater than the first width threshold 63.

[0057] Then, in the above case, the determination processing unit 54 generates a determination result that the defect is a kink in the wire rope W. The generated determination result includes information that can identify the position of the wire rope W that is determined to be a kink.

[0058] 10, the determination processing unit 54 (control unit 50) is configured to determine that the wire rope W is not defective when the half-width 205 at the effective height 203 of the peak waveform is between the first width threshold 63 and the second width threshold 64. That is, when the half-width 205 at the effective height 203 of the peak waveform is between the first width threshold 63 and the second width threshold 64, the determination processing unit 54 (control unit 50) determines that the wire rope W is not defective, such as a wire break or kink, but is in a state other than a defect of the wire rope W, such as a distortion of the regular symmetry of the wires constituting the wire rope W, a disturbance in the magnetic properties caused by the application of stress due to the operation of the elevator 103 to the wire rope W, and a disturbance in the twist of the wire rope W.

[0059] Then, the determination processing unit 54 generates a determination result that, in the above case, the wire rope W is not defective, such as a broken wire or a kink, but is in a state other than a defect. The generated determination result includes information that can identify the position of the wire rope W that has been determined to be in a state other than a defect.

[0060] FIG. 12 is a diagram showing the peak waveform of (C) in FIG. 10. In the peak waveform shown in FIG. 11, the effective height 203 of the peak waveform is 3.4, which is greater than the height threshold value 62. The half-width 205 at the effective height 203 of the peak waveform is 17.2, which is between the first width threshold value 63 and the second width threshold value 64. At the longitudinal position of the wire rope W where the peak waveform shown in FIG. 12 was acquired, the inspection worker confirmed the distortion (deformation) of the wire of the wire rope W by palpation inspection, but did not confirm the wire breakage and kink of the wire rope W. Also, at the longitudinal position of the wire rope W where the peak waveform other than (C) shown in FIG. 10 was acquired where the half-width 205 at the effective height 203 of the peak waveform is between the first width threshold value 63 and the second width threshold value 64, the inspection worker confirmed the state other than the defect of the wire rope W by palpation inspection, but did not confirm the wire breakage and kink of the wire rope W.

[0061] In addition, the judgment processing unit 54 (control unit 50) is configured to judge that when the effective height 203 of the peak waveform is equal to or less than the height threshold value 62, the wire rope W is in a normal state, which does not correspond to either a defect in the wire rope W or a state other than a defect in the wire rope W.

[0062] In the above case, the determination processing unit 54 generates a determination result indicating that the wire rope W is in a normal state. The generated determination result includes information that can identify the position of the wire rope W that is determined to be in a normal state.

[0063] Fig. 13 is a diagram showing the peak waveform of (D) in Fig. 10. The peak waveform shown in Fig. 13 has an effective height 203 of 1.9, which is smaller than the height threshold value 62. At the longitudinal positions of the wire rope W where the peak waveform shown in Fig. 13 was acquired, defects such as wire breakage and kinks of the wire rope W were not confirmed by palpation inspection by an inspector. Furthermore, at the longitudinal positions of the wire rope W where peak waveforms other than (D) shown in Fig. 10 where the effective height 203 of the peak waveform is equal to or smaller than the height threshold value 62 were acquired, defects such as wire breakage and kinks of the wire rope W were not confirmed by palpation inspection by an inspector.

[0064] <Judgment result display> The control unit 50 displays the defect determination result (analysis result) by the determination processing unit 54 on the touch panel 70. For example, the control unit 50 causes the touch panel 70 to display, as a numerical value, a display indicating the position of the defect in the wire rope W determined to be defective. The control unit 50 also displays text information that allows identification of the type of the determined defect (wire break or kink). The control unit 50 may cause the touch panel 70 to display, as a numerical value, a display indicating the position of the wire rope W determined to be in a state other than a defect by the determination processing unit 54.

[0065] (Wire rope inspection processing) The wire rope W inspection process (inspection method) of this embodiment will be described with reference to Fig. 14. This wire rope W inspection process is executed by the wire rope inspection device 101 and processing device 102 of the wire rope inspection system 100. That is, steps 601 to 603 indicate control processes by the processing unit 41 of the wire rope inspection device 101. And steps 604 to 611 indicate control processes by the control unit 50 of the processing device 102. Note that the order of the processing steps can be reversed or executed simultaneously as long as there is no contradiction between them.

[0066] First, in step 601, the processing unit 41 starts inspection of the wire rope W based on receipt of an input operation to the touch panel 70. Then, the processing unit 41 transmits a signal indicating the start of inspection to the control device 103d of the elevator 103 and the processing unit 41 of the wire rope inspection device 101. After that, the process proceeds to 602.

[0067] In step 602, the magnetic excitation unit 20 applies a magnetic field to the wire rope W so as to excite the magnetization state of the wire rope W. Then, the process proceeds to 603.

[0068] In step 603, the detection unit 30 acquires a detection signal by detecting a change in the magnetic flux of the wire rope W to which a magnetic field is applied while moving relatively to the wire rope W. Thereafter, the process proceeds to step 604.

[0069] In step 604, the waveform generating unit 51 generates a magnetic flux waveform, which is a signal waveform, based on the acquired detection signal. After that, the process proceeds to step 605.

[0070] In step 605, the waveform generating unit 51 obtains a moving average waveform by performing a moving average process on the generated magnetic flux waveform. Then, the process proceeds to step 606.

[0071] In step 606, the difference acquisition unit acquires a difference waveform 201 by performing difference processing on the acquired moving average waveform based on the difference in signal values ​​at different positions of the wire rope W to be inspected. Then, the process proceeds to step 607.

[0072] In step 607, the peak waveform detection section 53 obtains the effective height 203 of the peak waveform in the differential waveform 201 based on the obtained differential waveform 201. After that, the process proceeds to step 608.

[0073] In step 608, the peak waveform detection unit 53 obtains the half-width 205 of the peak waveform for a peak waveform whose effective height 203 is greater than the height threshold 62. After that, the process proceeds to step 609.

[0074] In step 609, the determination processing unit 54 (control unit 50) determines whether or not there is a defect in the wire rope W based on the effective height 203 of the peak waveform in the differential waveform 201 and the half-width 205 of the peak waveform in the differential waveform 201. Thereafter, the process proceeds to step 610.

[0075] In step 610, the control unit 50 causes the touch panel 70 to display the determination result.

[0076] (Effects of this embodiment) In this embodiment, the following effects can be obtained.

[0077] In the wire rope inspection device 101 and the wire rope W inspection method of this embodiment, a differential waveform 201 is obtained by performing differential processing based on the difference between signal values ​​at different positions of the inspection target for a signal waveform based on the acquired detection signal, and it is determined whether or not there is a defect in the wire rope W based on the peak waveform height 202 and the peak waveform width 204 in the acquired differential waveform 201. As a result, it is possible to distinguish between peak waveforms caused by defects in the wire rope W and peak waveforms caused by conditions other than defects in the wire rope W based on the peak waveform height 202 and the peak waveform width 204 in the differential waveform 201. Therefore, defects in the wire rope W can be determined with high accuracy.

[0078] Furthermore, in the wire rope inspection device 101 according to the above embodiment, the following further effects can be obtained by configuring it as follows.

[0079] That is, in this embodiment, as described above, when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62, the processing device 102 (controller 50) determines whether or not the wire rope W is defective based on the width 204 of the peak waveform in the differential waveform 201. As a result, when the height 202 of the peak waveform in the differential waveform 201 is equal to or less than the height threshold 62, the processing device 102 does not acquire the width 204 of the peak waveform, thereby reducing the processing burden in determining whether or not the wire rope W is defective.

[0080] Furthermore, in this embodiment, as described above, the processing device 102 (control unit 50) determines that the wire rope W is defective when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62 and the width 204 of the peak waveform in the differential waveform 201 is within a predetermined range. As a result, when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62, it can be determined that the wire rope W is defective when the width 204 of the peak waveform in the differential waveform 201 is within a predetermined range, and it can be determined that the wire rope W is in a state other than a defect when the width 204 of the peak waveform in the differential waveform 201 is not within the predetermined range, so that it is possible to easily and accurately determine whether or not the wire rope W is defective.

[0081] Furthermore, in this embodiment, as described above, the processing device 102 (control unit 50) determines that the defect in the wire rope W is a wire break in the wire rope W when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62 and the width 204 of the peak waveform in the differential waveform 201 is in a range smaller than the first width threshold 63. As a result, whether or not the wire rope W is a wire break is determined based on not only the height threshold 62 but also the first width threshold 63, so that even if the height 202 of the peak waveform in the differential waveform 201 is high, it is possible to more easily and accurately determine whether the wire rope W is a wire break or a state other than a defect in the wire rope W. As a result, not only the presence or absence of a defect in the wire rope W but also the type of defect (wire break) can be determined.

[0082] In addition, in this embodiment, as described above, the processing device 102 (control unit 50) determines that the wire rope W is a kink, which is an irrecoverable plastic deformation as a defect of the wire rope W, when the height 202 of the peak waveform in the differential waveform 201 is greater than the height threshold 62 and the width 204 of the peak waveform in the differential waveform 201 is in a range greater than the second width threshold 64 which is greater than the first width threshold 63. As a result, whether or not the wire rope W is a kink is determined based on not only the height threshold 62 but also the second width threshold 64, so that even if the height 202 of the peak waveform in the differential waveform 201 is high, it is possible to more easily and accurately determine whether the wire rope W is a kink or a state other than a defect. As a result, not only the presence or absence of a defect in the wire rope W but also the type of defect (kink) can be determined.

[0083] Furthermore, in this embodiment, as described above, the processing device 102 (control unit 50) determines that the wire rope W is not defective when the width 204 of the peak waveform in the differential waveform 201 is between the first width threshold 63 and the second width threshold 64 that is larger than the first width threshold 63. As a result, whether or not the wire rope W is in a state other than a defect, rather than a defect such as a wire break or a kink, is determined based not only on the height threshold 62 but also on the first width threshold 63 and the second width threshold 64, so that even if the height 202 of the peak waveform in the differential waveform 201 is high, it is possible to more easily and accurately determine whether the wire rope W is in a state other than a defect.

[0084] Furthermore, in this embodiment, as described above, the peak waveform height 202 in the differential waveform 201 is the effective height 203 from a value based on the bottom of the valleys at both ends of the peak waveform to a value based on the peak of the peak waveform. By basing the peak waveform height 202 in the differential waveform 201 on the effective height 203 of the peak waveform, the height of the peak waveform can be obtained more accurately than when the peak waveform height 202 in the differential waveform 201 is based on the zero peak value of the peak waveform. Therefore, even if the zero peak value of the peak waveform in the differential waveform 201 is small, it is possible to more accurately determine whether or not the wire rope W is defective.

[0085] Furthermore, in this embodiment, as described above, the width 204 of the peak waveform in the differential waveform 201 is the width 204 of the peak waveform at a height position within the range of the effective height 203. As a result, compared to the case where the height 202 of the peak waveform is based on the width 204 of the peak waveform at a height position within the range of the accurate effective height 203, it is possible to determine whether or not the wire rope W is defective with even greater accuracy.

[0086] In this embodiment, as described above, the width 204 of the peak waveform in the differential waveform 201 is the half-width 205 of the effective height 203 of the peak waveform. This makes it easier to stably obtain the width of the portion having a waveform at both ends of the peak waveform even when there is a large variation in the positions of the bottoms of the valleys at both ends of the peak waveform, and also makes it possible to prevent the width from becoming excessively small, so that it is possible to appropriately determine whether or not the wire rope W is defective.

[0087] In addition, in this embodiment, as described above, the processing device 102 (control unit 50) acquires a moving average waveform by performing moving average processing on the signal waveform based on the detection signal acquired by the detection unit 30, acquires a differential waveform 201 by performing difference processing on the acquired moving average waveform, and judges a defect in the wire rope W based on the height 202 of the peak waveform and the width 204 of the peak waveform in the acquired difference waveform 201. In this way, a moving average waveform with reduced noise can be acquired by acquiring a moving average waveform by performing moving average processing on the signal waveform. Therefore, a defect in the wire rope W can be judged based on the differential waveform 201 acquired based on the moving average waveform with reduced noise, and therefore a judgment process of whether or not the wire rope W is defective can be easily executed.

[0088] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope of the claims.

[0089] For example, in the above embodiment, the defects to be judged are two types, a wire break and a kink, but the present invention is not limited to this. For example, instead of a kink, the adhesion of a foreign matter such as iron powder may be judged as a defect. Also, the configuration may be such that more than two types of defects are judged. Also, only a wire break may be judged as a defect.

[0090] In the above embodiment, the height of the peak waveform in the differential waveform is the effective height from the value based on the bottom of the valley at either end of the peak waveform to the value based on the peak of the peak waveform, but the present invention is not limited to this. For example, the height of the peak waveform in the differential waveform may be the height from the value based on the bottom of the valley at either end of the peak waveform to the value based on the peak of the peak waveform.

[0091] In the above embodiment, the value based on the bottom of the valley at both ends of the peak waveform is the average value (median value) of the difference waveform value of the bottom of the valley at one end of the peak waveform and the difference waveform value of the bottom of the valley at the other end of the peak waveform, but the present invention is not limited to this. For example, the value based on the bottom of the valley at both ends of the peak waveform may be one-third, two-thirds, or another value obtained by adding the difference waveform value of the bottom of the valley at one end of the peak waveform and the difference waveform value of the bottom of the valley at the other end of the peak waveform.

[0092] In the above embodiment, the width of the peak waveform in the differential waveform is the half-width of the effective height of the peak waveform, but the present invention is not limited to this. For example, the width of the peak waveform in the differential waveform is not particularly limited, and may be the width at one-third of the effective height of the peak waveform, the width at two-thirds of the effective height of the peak waveform, or the half-width of a predetermined height of the peak waveform.

[0093] In the above embodiment, the peak waveform detector obtains the half-width of the peak waveform for a peak waveform whose effective height is greater than the height threshold, but the present invention is not limited to this. For example, the peak waveform detector may be configured to obtain the half-width of the peak waveform regardless of the effective height of the acquired peak waveform.

[0094] In the above embodiment, the determination processing unit has been described as determining that the wire rope is in a normal state, i.e., not corresponding to a wire rope defect or a state other than a wire rope defect, when the effective height of the peak waveform is equal to or less than the height threshold value, but the present invention is not limited thereto. For example, the determination processing unit may be configured to determine that the wire rope is in a normal state, i.e., not corresponding to a wire rope defect or a state other than a wire rope defect, when the effective height of the peak waveform is equal to or less than the height threshold value and the half-width of the effective height of the peak waveform is in a range smaller than the first width threshold value. In this case, the determination processing unit may be configured to determine that the wire rope is in a state other than a wire rope defect, when the effective height of the peak waveform is equal to or less than the height threshold value and the half-width of the effective height of the peak waveform is between the first width threshold value and the second width threshold value.

[0095] In the above embodiment, the height threshold, the first width threshold, and the second width threshold are set in advance, but the present invention is not limited to this. For example, the height threshold, the first width threshold, and the second width threshold may be set by selecting from a plurality of candidates based on an input operation by an inspector.

[0096] In the above embodiment, a moving average waveform is obtained by performing moving average processing on a signal waveform based on a detection signal, and a difference process is performed on the obtained moving average waveform, but the present invention is not limited to this. For example, moving average processing may not be performed on a signal waveform based on a detection signal. In addition, noise removal processing other than moving average processing, such as low-pass filter processing, may be performed.

[0097] In addition, in the above embodiment, an example of inspecting the wire rope of an elevator has been described, but the present invention is not limited to this. For example, the present invention may be configured to inspect wire ropes of devices other than elevators, such as cranes and ropeways.

[0098] In the above embodiment, the two detection coils of the detection unit are independent saddle-shaped coils, but the present invention is not limited to this. For example, the detection unit may be a pair of solenoid coils that are wound around the wire rope and are differentially connected.

[0099] In the above embodiment, the excitation coil is wound around the outside of the detection coil with respect to the wire rope, but the present invention is not limited to this. For example, the excitation unit and the detection unit may be arranged side by side along the extension direction of the wire rope.

[0100] In the above embodiment, the magnetic field adjusting units are arranged to face each other across the wire rope, but the present invention is not limited to this. For example, the two magnetic field adjusting units may be arranged to face the N pole and the S pole, respectively, toward the wire rope. The two magnetic field adjusting units may be arranged to face the S pole, respectively, toward the wire rope. The two magnetic field adjusting units may be arranged to have the N pole and the S pole along the extension direction of the wire rope, rather than facing each other. In this case, the two magnetic field adjusting units may be oriented in the same direction or different directions. The magnetic field adjusting units may be arranged to apply a magnetic field in a direction that is shifted obliquely from a direction parallel to the extension direction of the wire rope. The two magnetic field adjusting units may be arranged on both sides of the direction intersecting the extension direction of the wire rope. The magnetic field adjusting units may not be provided, and the magnetic flux may be detected without adjusting the magnetic field.

[0101] In the above embodiment, the magnetic flux adjusting unit is formed of a permanent magnet, but the present invention is not limited to this. For example, the magnetic flux adjusting unit may be formed of an electromagnet.

[0102] In the above embodiment, the detector coil is provided on each of the four wire ropes, but the present invention is not limited to this. For example, the detector coil may be configured to detect the magnetic flux of one to three wire ropes, or may be configured to detect the magnetic flux of five or more wire ropes. Also, the magnetic flux of multiple wire ropes may be detected by one detector coil.

[0103] [Aspects] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0104] (Item 1) a wire rope inspection device for detecting a change in magnetic flux of a wire rope to be inspected; A processing device that determines defects in the wire rope based on the measurement results of the wire rope by the wire rope inspection device, The wire rope inspection device includes an excitation unit that applies a magnetic field to the wire rope, and a detection unit that acquires a detection signal by detecting a change in magnetic flux of the wire rope to which a magnetic field has been applied by the excitation unit while moving relative to the wire rope, The processing device obtains a differential waveform by performing differential processing based on the difference in signal values ​​at different positions of the object to be inspected for a signal waveform based on the detection signal acquired by the detection unit, and determines whether or not there is a defect in the wire rope based on the height of the peak waveform and the width of the peak waveform in the acquired differential waveform.

[0105] (Item 2) The wire rope inspection system of item 1, wherein the processing device determines whether or not the wire rope is defective based on the width of the peak waveform in the difference waveform when the height of the peak waveform in the difference waveform is greater than a height threshold value.

[0106] (Item 3) 3. The wire rope inspection system of claim 1, wherein the processing device determines that the wire rope is defective when the height of the peak waveform in the difference waveform is greater than a height threshold and the width of the peak waveform in the difference waveform is within a predetermined range.

[0107] (Item 4) The wire rope inspection system described in item 3, wherein the processing device determines that a wire rope wire is defective due to a broken wire when the height of the peak waveform in the differential waveform is greater than a height threshold and the width of the peak waveform in the differential waveform is within a range smaller than a first width threshold.

[0108] (Item 5) The wire rope inspection system of item 3 or 4, wherein the processing device determines that a kink in the wire rope is an irrecoverable plastic deformation that is a defect in the wire rope when the height of the peak waveform in the differential waveform is greater than a height threshold and the width of the peak waveform in the differential waveform is in a range greater than a second width threshold that is greater than a first width threshold.

[0109] (Item 6) The defects of the wire rope include a break in a wire of the wire rope and a kink in the wire rope which is an irrecoverable plastic deformation. The wire rope inspection system according to any one of items 3 to 5, wherein the processing device determines that the wire rope is not defective when the width of the peak waveform in the differential waveform is between a first width threshold and a second width threshold that is greater than the first width threshold.

[0110] (Item 7) The height of the peak waveform in the differential waveform is an effective height from a value based on the bottom of the valley at both ends of the peak waveform to a value based on the peak of the peak waveform. A wire rope inspection system according to any one of claims 1 to 6.

[0111] (Item 8) 8. The wire rope inspection system of claim 7, wherein the width of the peak waveform in the differential waveform is the width of the peak waveform at a height position within the effective height range.

[0112] (Item 9) 9. The wire rope inspection system of claim 8, wherein the width of the peak waveform in the difference waveform is a half-width of the effective height of the peak waveform.

[0113] (Item 10) The processing device obtains a moving average waveform by performing moving average processing on the signal waveform based on the detection signal acquired by the detection unit, obtains the differential waveform by performing difference processing on the acquired moving average waveform, and determines whether or not there is a defect in the wire rope based on the height of the peak waveform and the width of the peak waveform in the acquired differential waveform.A wire rope inspection system as described in any one of items 1 to 9.

[0114] (Item 11) applying a magnetic field to a wire rope to be inspected; obtaining a detection signal by detecting a change in magnetic flux of the wire rope to which a magnetic field is applied while moving relative to the wire rope; A step of acquiring a differential waveform by performing differential processing on a signal waveform based on the acquired detection signal based on a difference in signal values ​​at different positions of the inspection object; and determining whether or not there is a defect in the wire rope based on the height and width of a peak waveform in the acquired differential waveform. [Explanation of symbols]

[0115] 20 Excitation section 30 Detection unit 62 Height Threshold 63 First Width Threshold 64 Second width threshold 100 Wire Rope Inspection System 101 Wire rope inspection device 102 Processing equipment 201 Differential Waveform 202 Peak Waveform Height 203 Effective height of peak waveform 203a Value based on the bottom of the valley at both ends of the peak waveform 203b Value based on the peak of the peak waveform 204 Peak Waveform Width 205 Peak waveform half-width W Wire Rope

Claims

1. a wire rope inspection device for detecting a change in magnetic flux of a wire rope to be inspected; A processing device that determines defects in the wire rope based on the measurement results of the wire rope by the wire rope inspection device, The wire rope inspection device includes an excitation unit that applies a magnetic field to the wire rope, and a detection unit that acquires a detection signal by detecting a change in magnetic flux of the wire rope to which a magnetic field has been applied by the excitation unit while moving relative to the wire rope, The processing device obtains a differential waveform by performing differential processing based on the difference in signal values ​​at different positions of the object to be inspected for a signal waveform based on the detection signal acquired by the detection unit, and determines whether or not there is a defect in the wire rope based on the height of the peak waveform and the width of the peak waveform in the acquired differential waveform.

2. The wire rope inspection system of claim 1 , wherein the processing device determines whether or not the wire rope is defective based on the width of the peak waveform in the difference waveform when the height of the peak waveform in the difference waveform is greater than a height threshold value.

3. 2. The wire rope inspection system of claim 1, wherein the processing device determines that the wire rope is defective when the height of the peak waveform in the difference waveform is greater than a height threshold and the width of the peak waveform in the difference waveform is within a predetermined range.

4. The wire rope inspection system of claim 3, wherein the processing device determines that a wire rope defect is a broken wire of the wire rope when the height of the peak waveform in the differential waveform is greater than a height threshold and the width of the peak waveform in the differential waveform is in a range smaller than a first width threshold.

5. The wire rope inspection system of claim 3, wherein the processing device determines that a kink in the wire rope is an irrecoverable plastic deformation that is a defect of the wire rope when the height of the peak waveform in the difference waveform is greater than a height threshold and the width of the peak waveform in the difference waveform is in a range greater than a second width threshold that is greater than a first width threshold.

6. The defects of the wire rope include a break in a wire of the wire rope and a kink in the wire rope which is an irrecoverable plastic deformation.

4. The wire rope inspection system of claim 3, wherein the processing device determines that the wire rope is not defective when the width of the peak waveform in the difference waveform is between a first width threshold and a second width threshold that is greater than the first width threshold.

7. 2. The wire rope inspection system of claim 1, wherein the height of the peak waveform in the difference waveform is an effective height from a value based on the bottom of the valleys at both ends of the peak waveform to a value based on the peak of the peak waveform.

8. 8. The wire rope inspection system of claim 7, wherein the width of the peak waveform in the difference waveform is the width of the peak waveform at a height position within the effective height range.

9. 9. The wire rope inspection system of claim 8, wherein the width of the peak waveform in the difference waveform is a half-width of the effective height of the peak waveform.

10. The wire rope inspection system of claim 1, wherein the processing device obtains a moving average waveform by performing moving average processing on the signal waveform based on the detection signal acquired by the detection unit, obtains the differential waveform by performing difference processing on the acquired moving average waveform, and determines whether or not there is a defect in the wire rope based on the height of the peak waveform and the width of the peak waveform in the acquired differential waveform.

11. applying a magnetic field to a wire rope to be inspected; obtaining a detection signal by detecting a change in magnetic flux of the wire rope to which a magnetic field is applied while moving relative to the wire rope; A step of acquiring a differential waveform by performing differential processing on a signal waveform based on the acquired detection signal based on a difference in signal values ​​at different positions of the inspection object; and determining whether or not there is a defect in the wire rope based on the height and width of a peak waveform in the acquired differential waveform.

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