JP6594065B2 - Rope inspection device and rope inspection system - Google Patents

Description

  The present invention relates to a technique for inspecting deterioration of a wire rope such as an elevator.

  Generally, a wire rope such as an elevator has a structure in which a plurality of strands made of steel wire are twisted together. If this wire rope is used over a long period of time under a load, it may deteriorate (break or the like). Therefore, it is necessary to inspect the wire rope regularly.

  For example, in Patent Document 1, as a flaw detector for an elevator wire rope, a pair of permanent magnets that magnetize the wire rope in the longitudinal direction, an excitation coil that applies an alternating magnetic field in the longitudinal direction of the wire rope, and a pair of permanent magnets And a detection coil that detects a leakage magnetic flux from a magnetized wire rope, and discloses a technique for identifying a disconnection point based on an output signal of the detection coil.

JP 2012-103177 A

  However, in the technique of Patent Document 1, as can be seen from FIG. 1 and the like of Patent Document 1, two excitation coils are connected in series, and a strong pair of permanent magnets that magnetize a measurement object up to saturation magnetization is not used. There is a problem that the S / N ratio cannot be realized. In addition, a component that occurs when the measurement object moves at a constant speed in the saturation magnetization state and a component that detects the amplitude of the output voltage component having a frequency equal to the excitation frequency are generated in the detection coil at the same time. There are problems such as signal cancellation and noise increase, and it is difficult to detect deterioration at a high S / N ratio.

  Then, this invention makes it a subject to test | inspect for deterioration of wire ropes, such as an elevator, by high SN ratio.

In order to solve the above-mentioned problems, the present invention is a rope inspection device that generates inspection data relating to deterioration of a wire rope having a twisted structure in which a plurality of strands are twisted together, and generates an alternating current of a predetermined frequency. A first oscillating coil, a second oscillating coil, which are arranged to be shifted in the extending direction of the wire rope to be inspected and generate alternating magnetic fields opposite to each other based on the alternating current received from the alternating current generating unit The coil is arranged in the middle of the first oscillation coil and the second oscillation coil or in the vicinity thereof, shifted in the circumferential direction of the wire rope to be inspected, and received from the first oscillation coil and the second oscillation coil. switching is connected to a plurality of receiving coils comprising a first and a second receiver coil outputs the magnetic field waveform based on the magnetic field as said test data to said plurality of receiving coils When the for first receiving coil, the magnetic field generated by the first oscillator coil is controlled to be smaller than the magnetic field generated by the second oscillator coil, for the second receiver coil, said second oscillator coil A control unit that controls the switching unit to switch the plurality of receiving coils so that the magnetic field generated by the switching unit is smaller than the magnetic field generated by the first oscillation coil, and the plurality of receiving coils operate sequentially. A data processing unit that subtracts a component generated based on the twisted structure from the waveform of the inspection data. Other means will be described later.

  According to the present invention, it is possible to inspect deterioration of a wire rope such as an elevator at a high SN ratio.

It is explanatory drawing of the principle which produces | generates the test | inspection data regarding deterioration of a test object (wire rope) using two oscillation coils and one receiving coil. It is explanatory drawing of the direction of the magnetic flux linked with a receiving coil in case a test object has a fracture | rupture. It is a graph which shows the relationship between the magnetic flux (PHI) linked to the receiving coil in the case of FIG. 2, and the position of a fracture | rupture location. It is a block diagram showing the whole rope inspection system composition concerning a 1st embodiment. It is a conceptual diagram which shows the whole structure of a rope inspection apparatus. The upper part is a diagram showing a magnetic field waveform output from the receiving coil. The lower part is a diagram showing a waveform after the noise component (noise) for the first one period is deleted from the upper part magnetic field waveform. It is a block diagram of the wire rope to be examined. It is a perspective view which shows the structural example of a rope inspection apparatus. It is a figure which shows the attachment state of the oscillation coil (1) and oscillation coil (2) in a rope inspection apparatus. (A) is a perspective view which shows the structural example of a 1st receiving coil part. (B) is a development view of the circuit portion in (a). (C) is a perspective view which shows the structural example of a 2nd receiving coil part. (A) is a schematic diagram at the time of seeing a rope inspection apparatus from the side. (B) is explanatory drawing of the magnetic field intensity | strength from each of the 1st oscillation coil part produced | generated for 1st receiving coil parts in (a), and a 2nd oscillation coil part. (C) is explanatory drawing of the magnetic field intensity | strength from each of the 1st oscillation coil part produced | generated for 2nd receiving coil parts in (a), and a 2nd oscillation coil part. It is a flowchart which shows the inspection process which pinpoints the degradation location of a wire rope by an evaluation apparatus. It is a schematic diagram at the time of seeing the rope inspection apparatus of 2nd Embodiment from the side. It is a schematic diagram at the time of seeing the rope inspection apparatus of 3rd Embodiment from the side. It is a schematic diagram at the time of seeing the rope inspection apparatus of 4th Embodiment from the side. It is a schematic diagram at the time of seeing the rope inspection apparatus of 5th Embodiment from the side.

Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings.
First, the principle of generating inspection data relating to deterioration of an inspection target (wire rope) using two oscillation coils and one receiving coil, which is employed in the present embodiment, will be described with reference to FIG.

  As shown in FIG. 1, in this embodiment, the oscillation coil (1) (first oscillation coil), the reception coil, and the oscillation coil (2) (second oscillation coil) are inspected at positions facing the inspection object M. The target M is arranged in a line in the extending direction (lateral direction in FIG. 1).

The oscillation coil (1) and the oscillation coil (2) generate alternating magnetic fields opposite to each other.
The receiving coil is positioned between the oscillation coil (1) and the oscillation coil (2), and outputs a magnetic field waveform based on the magnetic field received from the oscillation coil (1) and the oscillation coil (2) as inspection data.

  Magnetic field lines B1, B2, B3 generated from the oscillation coil (1) pass through the inspection object M, but leak from the inspection object M and return to the oscillation coil (1). At this time, the magnitudes of the magnetic lines B1, B2, and B3 returning to the oscillation coil (1) depend on the cross-sectional area of the inspection object M and the height h (distance from the inspection object M to the oscillation coil (1)). Further, the closer to the oscillation coil (1), the stronger the magnetic force, so that the magnitude relationship of the magnetic field lines B1, B2, B3 is B1> B2> B3.

  Similarly, the magnetic lines of force B11, B12, B13 generated from the oscillation coil (2) pass through the inspection object M, but leak from the inspection object M and return to the oscillation coil (2). Further, the magnitude relationship of the strengths of the magnetic lines of force B11, B12, and B13 is B11> B12> B13.

  Here, the upward direction in FIG. 1 is a positive direction of magnetic force. Further, it is assumed that the intensity of the alternating magnetic field generated by the oscillation coil (1) and the oscillation coil (2) is the same. Further, in the following, at a certain moment, the magnetic field generated from the oscillation coil (1) is generated in a direction passing through the inside of the oscillation coil (1) downward, and the magnetic field generated from the oscillation coil (2) passes through the interior of the oscillation coil upward. Consider a case that occurs in a direction.

At this time, at the position between the oscillation coil (1) and the receiving coil, the magnetic field lines B1 and B13 cancel each other, but the magnetic field lines B1 are stronger (B1 + B13> 0), so that upward magnetic field lines remain.
Further, at the position between the oscillation coil (2) and the receiving coil, the magnetic field lines B3 and B11 cancel each other, but the magnetic field lines B11 are stronger (B3 + B11 <0), so that downward magnetic field lines remain.

  In the receiving coil, the magnetic field lines B2 and B12 cancel each other, and the magnetic field lines B2 and B12 have the same strength (B2 + B12 = 0), so no magnetic field lines remain. Therefore, if the inspection object M is normal (if there is no deterioration such as breakage), no current is generated in the receiving coil.

Here, with reference to FIG. 2, the case where the test object M has a fracture will be described. Hereinafter, the magnetic flux interlinking with the receiving coil is represented by Φ.
As shown in FIG. 2 (a), when there is a break in the position between the oscillation coil (1) and the receiving coil in the inspection object M, the oscillation coil (1) generates and passes through the inspection object M. Since many lines of magnetic force come out upward from the broken part, the magnetic flux Φ <0.

Further, as shown in FIG. 2B, if there is a break in the inspection object M and at a position directly below the receiving coil, the magnetic flux Φ = 0.
Further, as shown in FIG. 2C, when the inspection object M is broken at the position between the receiving coil and the oscillation coil (2), the magnetic flux Φ> 0.

At this time, the relationship between the magnetic flux Φ interlinked with the receiving coil and the position of the broken portion is approximately as shown in FIG.
Therefore, it is possible to identify a deteriorated portion such as a breakage in the inspection target M based on the temporal change of the current (magnetic field waveform) output from the receiving coil. That is, the magnetic field waveform output from the receiving coil greatly fluctuates at the deteriorated portion of the inspection object M. Therefore, based on such a configuration and principle, inspection data relating to deterioration of the inspection object M can be generated with a high SN ratio without using a permanent magnet.

  If the alternating magnetic field generated by the oscillation coil (1) and the oscillation coil (2) have the same strength, the inspection object M is normal when the position of the reception coil deviates from either of them. Even if there is no deterioration such as breakage, the magnetic flux Φ interlinking with the receiving coil does not become zero. However, even if the position of the receiving coil is deviated from either of them, if it is within the limits of amplification and processing of the current output from the receiving coil, the oscillation with the oscillation coil (1) One of the alternating magnetic fields generated by the coil (2) can be adjusted to be stronger than the other (corresponding to magnetic flux Φ = 0). Therefore, the receiving coil does not necessarily have to be arranged in the exact middle between the oscillation coil (1) and the oscillation coil (2), and may be arranged in the vicinity of the middle. Further, when the deviation of the position of the receiving coil from the middle is small, even if the strength of the alternating magnetic field generated by the oscillating coil (1) and the oscillating coil (2) remains the same (magnetic flux Φ = 0). Effective test data can be obtained.

  In the present embodiment, the plurality of receiving coils are arranged while being shifted in the circumferential direction of the wire rope to be inspected so that the entire circumferential direction of the wire rope can be covered with the plurality of receiving coils. Thereby, the inspection regarding the whole circumferential direction of a wire rope can be performed at once (details are mentioned later).

(First embodiment)
Next, the overall configuration of the rope inspection system according to the first embodiment will be described. As shown in FIG. 4, the rope inspection system 1000 includes a rope inspection device 1100, an evaluation device 1200, an operation input unit 1300, and a display unit 1400.

The rope inspection apparatus 1100 generates inspection data relating to deterioration of a wire rope such as an elevator.
The evaluation apparatus 1200 executes an inspection process that identifies a deteriorated portion of the wire rope based on the inspection data received from the rope inspection apparatus 1100.

The operation input unit 1300 is information input means such as a keyboard and a mouse.
The display unit 1400 is an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or the like that displays inspection results (analysis results of inspection data).

  The rope inspection apparatus 1100 includes a sensor unit 1500 and a sensor unit 1510, a switching unit 1111, an AC generation unit 1120, an amplification / filter unit 1130, an analog / digital (AD) conversion unit 1150, a time adjustment / detection unit 1160, A downsampling unit 1170, a memory unit 1180, and a data communication unit 1190.

  The sensor unit 1500 includes an oscillation coil (1) 1501 that generates an alternating magnetic field and eight reception coils (1) to (8) 1511. Note that the oscillation coil (1) 1501 is the oscillation coil (1) shown in FIG. 1, and the description of the reference numeral “1501” may be omitted hereinafter. Further, each of the receiving coils (1) to (8) 1511 is the receiving coil shown in FIG. 1, and hereinafter, the description of the reference numeral “1511” is omitted, and the receiving coils (1) and (1) to (1) to (1) ( 8) may be described as a receiving coil or the like.

  The sensor unit 1510 includes an oscillation coil (2) 1502 that generates an alternating magnetic field and eight reception coils (9) to (16) 1512. The oscillation coil (2) 1502 is the oscillation coil (2) shown in FIG. 1, and the description of the reference numeral “1502” may be omitted hereinafter. In addition, each of the receiving coils (9) to (16) 1512 is the receiving coil shown in FIG. 1, and hereinafter, the description of the reference numeral “1512” is omitted, and the receiving coil (9) and the receiving coils (9) to (9) ( 16) etc.

  In the rope inspection apparatus 1100, the oscillation coil (1) and the oscillation coil (2) are arranged so as to be shifted in the extending direction of the wire rope to be inspected, and are opposite to each other based on the alternating current received from the alternating current generating unit 1120. An alternating magnetic field is generated (see FIG. 8).

  The receiving coils (1) to (8) and (9) to (16) are arranged in the vicinity of the middle of the oscillation coil (1) and the oscillation coil (2) and shifted in the circumferential direction of the wire rope to be inspected, A magnetic field waveform based on the magnetic field received from the oscillation coil (1) and the oscillation coil (2) is output as inspection data (see FIGS. 8 and 10).

  As shown in FIG. 5, one AC generator 1120 is connected to the oscillation coil (1) and the oscillation coil (2). The oscillation coil (1) and the oscillation coil (2) generate alternating magnetic fields opposite to each other based on the alternating current (for example, 20 kHz) from the alternating current generating unit 1120. In order to generate the alternating magnetic fields in the oscillating coil (1) and the oscillating coil (2) in opposite directions, for example, the winding directions of the respective coils may be reversed.

  The AC generating unit 1120 generates an AC current having a predetermined frequency, and the timing at which the current flows is controlled by the control unit 1140. Specifically, in order to save power, the control unit 1140 stops the oscillation operation by the AC generation unit 1120 during the time period T3 in FIG. 6 (details will be described later). The signal generated by the AC generator 1120 is used as a reference signal 3100 for detection operation of the time adjustment / detection unit 1160.

  Further, the control unit 1140 generates a switching signal 3101 for controlling the switching unit 1111. The switching unit 1111 performs a switching operation according to the switching signal 3101.

  Further, the 16 reception coils (1) to (16) are connected to the amplification / filter unit 1130 via the switching unit 1111. The output signal from the amplification / filter unit 1130 is converted into a digital signal by the AD conversion unit 1150. After being converted, the digital signal is transmitted to the time adjustment / detection unit 1160. Note that the analog-to-digital conversion by the analog-to-digital conversion unit 1150 facilitates subsequent processing (such as downsampling). The time adjustment / detection unit 1160 performs a process of deleting a magnetic field waveform (noise part) for a predetermined period immediately after switching by the switching unit 1111 from the magnetic field waveforms detected by the receiving coil (details will be described with reference to FIG. 6). .

  In addition, the time zone for the deletion process in the magnetic field waveform of each receiving coil is accurately controlled by the control unit 1140. After this deletion processing, the time adjustment / detection unit 1160 performs full-wave rectification processing and filter processing (mainly processing by a low-pass filter (LPF)) using the reference signal 3100. Next, the digital signal processed by the time adjustment / detection unit 1160 has a sampling frequency (for example, 200 Hz) that is approximately 1/1000 of the sampling frequency (for example, 200 kHz) by the analog / digital conversion unit 1150 by the downsampling unit 1170. Conversion to coarse data (downsampling). Thereby, the capacity | capacitance of the whole data can be made small.

  The data converted by the downsampling unit 1170 is stored in the memory unit 1180 and output from the data communication unit 1190 as an output signal 3200. Since the data amount is small, the data communication unit 1190 can transmit data related to the plurality of receiving coils to the evaluation device 1200 wirelessly or by wire.

  Next, with reference to FIG. 6, the time interval for switching the receiving coil and the like will be described. In FIG. 6, the upper stage (upper half) is a diagram showing the magnetic field waveform output by the receiving coil, and the lower stage (lower half) is after removing the noise component (noise) for the first cycle from the upper stage magnetic field waveform. It is a figure which shows these waveforms.

  An alternating current flows through each receiving coil for a time width T1 (for example, 50 μs (200 kHz)). The time width T2 is, for example, 10 ms which is a sampling time of about 100 Hz (that is, the time width between time 1 and time 2 is 10 ms). The time width T3 is “time width T2−time width T1 × 16”. During the time width T3, the control unit controls the current from the AC generator 1120 to the oscillation coil (1) and the oscillation coil (2). 1140 (FIG. 5). The relationship between these time widths is T1 << T2, T1 × 16 << T3, and T2≈T3 (in FIG. 6, these relationships are not accurately described for the sake of drawing). Therefore, current consumption can be suppressed by controlling to stop the current from the AC generator 1120 to the oscillation coil (1) and the oscillation coil (2) during the time period T3 occupying most of the time period T2. Power saving can be realized.

  On the other hand, connection of the 16 receiving coils (1) to (16) is sequentially switched by the switching unit 1111 (FIG. 5), and a signal is input to the amplification / filtering unit 1130 (FIG. 5). As shown in the upper part of FIG. 6, each magnetic field waveform 5100 is mixed with noise in the first part. This reception noise is noise generated when the connection is switched by the switching unit 1111 (FIG. 5) that switches the reception coil.

  Here, processing for deleting a noise component detected by the receiving coil by the time adjustment function of the time adjustment / detection unit 1160 will be described. The magnetic field induced by the oscillation coil (1) and the oscillation coil (2) through which the alternating current generated by the AC generator 1120 flows is detected by each receiving coil. As described above, at this time, since the connection of the receiving coil is sequentially switched by the switching unit 1111 (FIG. 5), switching noise is generated. The waveform 5200 after the noise deletion processing in the lower part of FIG. 6 is an example in which the first one period is deleted and the time width T4 for the remaining three periods is detected as a signal component. This noise removal processing can be operated by, for example, a microcomputer (time adjustment / detection unit 1160) equipped with a CPU (Central Processing Unit).

Next, before describing the evaluation device 1200 illustrated in FIG. 4, a configuration example of the rope inspection device 1100 will be described.
As shown in FIG. 7, a wire rope 100 to be inspected has a structure in which a plurality of strands made of steel wires are twisted together. More specifically, the wire rope 100 has a structure in which, for example, six strands (small ropes) obtained by twisting several strands are twisted around a cord.

  Next, a configuration example of the rope inspection device 1100 will be described. As shown in FIG. 8, the rope inspection apparatus 1100 includes a main body unit 1, a first oscillation coil unit 11, a second oscillation coil unit 12, a first reception coil unit 21, and a second reception coil unit 22 as main components. I have.

  The main body unit 1 includes an AC generation unit 1120, an amplification / filter unit 1130, an analog / digital (AD) conversion unit 1150, a time adjustment / detection unit 1160, a downsampling unit 1170, a memory unit 1180, a data communication unit 1190, and the like shown in FIG. Although not shown in FIG. In addition, it is not necessary to put all the above-described components in the main body unit 1. For example, only the amplification / filter unit 1130 among them is arranged in the main body unit 1, and the other AC generation unit 1120, time The adjustment / detection unit 1160, the downsampling unit 1170, the memory unit 1180, the data communication unit 1190, and the like can be configured as separate units (not shown) outside the main unit 1 as separate circuit devices. It is good also as a structure connected with the main-body part 1 via wiring. As described above, the circuit configuration in the separate unit can be optimally arranged from the viewpoint of circuit power consumption and noise.

The first oscillating coil unit 11 includes an oscillating coil (1) on an inner wall surface (a semicircular cross section) of the passage of the wire rope to be inspected (see FIG. 9).
The 2nd receiving coil part 21 is provided with the oscillation coil (2) on the inner wall surface (a cross section is a semicircle) of the path | route of the wire rope to be examined (refer FIG. 9).

  The 1st receiving coil part 21 is provided with receiving coils (1)-(8) on the inner wall surface (the section is a semicircle) of the passage of the wire rope to be examined. Specifically, as shown in FIGS. 10A and 10B, the first reception coil unit 21 includes a wiring 211, a circuit including terminals 212 and 213, and reception coils (1) to (8). I have. In this way, by arranging the plurality of receiving coils (1) to (8) to be shifted in the circumferential direction of the wire rope to be inspected, the plurality of receiving coils (1) to (8) The upper half of the circumferential direction can be covered.

  Similarly, as shown in FIG. 8, the second receiving coil section 22 includes receiving coils (9) to (16) on the inner wall surface (the semicircular cross section) of the path of the wire rope to be inspected. Specifically, as shown in FIG. 10 (c), in the second receiving coil section 22, a plurality of receiving coils (9) to (16) are arranged by being shifted in the circumferential direction of the wire rope to be inspected. The receiving coils (9) to (16) can cover the lower half of the wire rope in the circumferential direction.

  In this manner, the receiving coils (1) to (16) can perform the inspection on the entire circumferential direction of the wire rope at a time.

  FIG. 11A is a schematic diagram when the rope inspection apparatus 1100 is viewed from the side. Here, the first reception coil unit 21 is arranged closer to the first oscillation coil unit 11 side than the middle between the first oscillation coil unit 11 and the second oscillation coil unit 12. The second receiving coil unit 22 is arranged closer to the second oscillation coil unit 12 side than the middle between the first oscillation coil unit 11 and the second oscillation coil unit 12.

  In this case, if the magnetic field intensity of the oscillation coil (1) in the first oscillation coil unit 11 and the oscillation coil (2) in the second oscillation coil unit 12 are the same, the reception coils (1) to (1) to The magnetic field from the oscillation coil (1) acts strongly on (8), and the magnetic field from the oscillation coil (2) is strong on the reception coils (9) to (16) of the second reception coil unit 22. Will work.

Therefore, as shown in FIG. 11B, for the first receiving coil unit 21, control is performed so that the magnetic field generated by the oscillation coil (1) is smaller than the magnetic field generated by the oscillation coil (2). Adjustment is performed by the unit 1140.
Further, as shown in FIG. 11C, the second receiving coil unit 22 is controlled so that the magnetic field generated by the oscillation coil (2) is smaller than the magnetic field generated by the oscillation coil (1). Adjustment is performed by the unit 1140.

  By such adjustment, the accuracy of the inspection data generated in the reception coils (1) to (8) of the first reception coil unit 21 and the reception coils (9) to (16) of the second reception coil unit 22 is increased. Can do.

  As can be seen from FIGS. 8 and 10 (a), the receiving coils (1) to (4) and the receiving coils (5) to (8) in the first receiving coil section 21 have the oscillation coil (1) and oscillation. The distance from each coil (2) is slightly different. Therefore, when the receiving coils (1) to (4) are operated and when the receiving coils (5) to (8) are operated, the relationship between the magnetic field strengths of the oscillation coil (1) and the oscillation coil (2) is the same. However, since the difference in the distance is very small, it is not necessary to adjust the relationship between the magnetic field strengths. The same applies to the reception coils (9) to (12) and the reception coils (13) to (16) in the second reception coil unit 22.

  Returning to FIG. 4, the evaluation apparatus 1200 will be described. The evaluation device 1200 is a computer device that executes an inspection process that identifies a deteriorated portion of the wire rope based on the inspection data received from the rope inspection device 1100. The evaluation apparatus 1200 includes a data input unit 1210, a data processing unit 1220, a signal control unit 1230, an output processing unit 1240, a storage unit 1250, and a control unit 1260. In the present embodiment, the inspection data corresponds to data at all stages from the receiving coil of the rope inspection device 1100 to the data input unit 1210 of the evaluation device 1200.

  The data input unit 1210 receives an output signal (inspection data) from the data communication unit 1190 of the rope inspection device 1100.

  The data processing unit 1220 performs inspection processing based on an output signal (inspection data) supplied from the data input unit 1210 and obtained through the control unit 1260 (details will be described later in FIG. 12). Information such as inspection results is stored in the storage unit 1250 as appropriate. Further, the data processing unit 1220 can correct the detection sensitivities of the receiving coils (1) to (16). Specifically, for example, the detection sensitivity of each receiving coil is measured using a dummy sample, and the sensitivity correction value is recorded individually so that all receiving coils have the same detection sensitivity. In addition, sensitivity correction may be performed using the recording information.

  The signal control means 1230 (see FIG. 4) controls signals in communication with the rope inspection device 1100 in accordance with the operation signal sent from the operation input unit 1300.

  The output processing unit 1240 performs processing for causing the display unit 1400 to display inspection results and the like in a display format that is easy to visually understand by appropriately using a graph or table format.

  The storage unit 1250 stores data processed by the data processing unit 1220 and the like.

  The control unit 1260 (see FIG. 4) is configured by a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and controls data transfer and arithmetic processing.

  The data processing unit 1220, the signal control unit 1230, and the output processing unit 1240 are realized by loading a program or data stored in the storage unit 1250 into the control unit 1260 and executing arithmetic processing.

  Next, with reference to FIG. 12, the inspection process by the data processing unit 1220 of the evaluation apparatus 1200 will be described (refer to FIG. 4 and the like as appropriate). This inspection process is performed for each of the inspection data by each receiving coil. Here, a case where the inspection data from one receiving coil is performed will be described. Therefore, when there are 16 receiving coils, the inspection process of FIG. 12 is performed on the inspection data of all the receiving coils. In addition, the results of the inspection processing of all the receiving coils can be integrated into one.

  First, the data processing unit 1220 acquires the inspection data from the rope inspection device 1100 from the storage unit 1250 (step S1). Here, the waveform displayed on the graph G1 is an example of inspection data. As described above, the wire rope 100 to be inspected has a structure in which a plurality of strands (small ropes) are twisted around the core rope (see FIG. 7). Therefore, even if there is no deterioration (breakage etc.) in the wire rope 100, the waveform has a shape having a small cycle wave in a large cycle wave.

  Therefore, next, the data processing unit 1220 performs filter processing (step S2). In this filter processing, for example, a wave having a large period is specified by FFT (Fast Fourier Transform), and the wave having the large period is subtracted from the waveform of the inspection data. As a result, the waveform can be made quite flat if the wire rope 100 is not deteriorated (breakage or the like). The waveform after this filter processing is as shown in the graph G2.

  Next, the data processing unit 1220 performs enhancement processing (step S3). The enhancement process is a process for emphasizing a portion corresponding to a deteriorated portion in the inspection data, and can be executed by, for example, squaring each waveform value. The waveform after this enhancement processing is as shown in graph G3.

  Next, the data processing unit 1220 repeats the processing from step S5 to step S7 every predetermined time width (for example, about 0.5 ms or 100 ms) (step S4 to step S8).

  The data processing unit 1220 determines whether or not there is a waveform value that exceeds the threshold for a waveform having a predetermined time width (step S5). If NO, the data processing unit 1220 determines that the waveform is normal (step S6). (Step S7). As shown in the graph G4, if there is a waveform value exceeding the threshold value, it is determined as abnormal.

  When the processing of step S4 to step S8 is completed for the entire inspection data, the data processing unit 1220 displays the inspection result on the display unit 1400 (step S9). This inspection result may be displayed for each receiving coil, or if there is an abnormality in one of all the receiving coils, an indication that there is an abnormality along with the position in the extension direction of the wire rope 100 is displayed. You may go. In addition, the result display may be performed by a waveform such as the graph G4, or by displaying the portion where the degradation portion is present in red together with the extension direction position of the wire rope 100 and displaying the other portion in yellow. You may perform by a color map display.

  As described above, according to the rope inspection apparatus 1100 of the present embodiment, the oscillation coil (1) and the oscillation coil (2) that generate AC magnetic fields in opposite directions, and the wire rope to be inspected in the middle or the vicinity thereof. By using a plurality of receiving coils (1) to (16) that are shifted in the circumferential direction of 100, a high SN ratio can be achieved without using a permanent magnet (the size and cost can be reduced accordingly). Thus, the deterioration of the wire rope such as an elevator can be inspected.

  Further, by switching the operations of the plurality of receiving coils (1) to (16) by the switching unit 1111, two oscillation coils and one AC generation unit 1120 are required, and the circuit scale can be reduced. Power saving, low cost, and compactness can be realized.

  11B and 11C, the magnetic field generated by the oscillation coil (1) and the generation of the oscillation coil (2) for the first reception coil unit 21 and the second reception coil unit 22 are used. By adjusting the magnitude of the magnetic field to be performed, the accuracy of the inspection data generated in the first receiving coil unit 21 and the second receiving coil unit 22 can be increased.

  Also, as shown in FIG. 6, the SN ratio can be further increased by deleting the switching noise for a predetermined period immediately after switching by the switching unit 1111 from the magnetic field waveforms obtained from each of the plurality of receiving coils.

  In addition, the evaluation device 1200 can specify a deteriorated portion of the wire rope 100 by executing an inspection process based on the inspection data received from the rope inspection device 1100.

(Second Embodiment)
As shown in FIG. 13, in the rope inspection apparatus 1100 of the second embodiment, in order from the left of the drawing, the first oscillation coil unit 11, the first reception coil unit 21, the third oscillation coil unit 13, and the second reception coil. The part 22 and the second oscillation coil part 12 are arranged.

Then, alternating magnetic fields opposite to each other are generated from the first oscillation coil unit 11 and the third oscillation coil unit 13, and these magnetic fields are received by the first reception coil unit 21.
Further, alternating magnetic fields opposite to each other are generated from the third oscillation coil unit 13 and the second oscillation coil unit 12, and these magnetic fields are received by the second reception coil unit 22.
The detection process is switched every two sets.

  With this configuration, the first receiving coil unit 21 is positioned between the first oscillating coil unit 11 and the third oscillating coil unit 13, and the second receiving coil unit 22 is connected to the third oscillating coil unit 13 and the second oscillating coil unit 13. Since it is located in the middle of the oscillating coil section 12, it is not necessary to adjust the magnetic field intensity as shown in FIGS. 11B and 11C, and the accuracy of the inspection data can be improved.

(Third embodiment)
As shown in FIG. 14, in the rope inspection apparatus 1100 of the third embodiment, the first receiving coil unit 21 and the second receiving coil are vertically arranged at an intermediate position between the first oscillating coil unit 11 and the second oscillating coil unit 12. The part 22 is arranged.

Then, alternating magnetic fields opposite to each other are generated from the first oscillation coil unit 11 and the second oscillation coil unit 12, and these magnetic fields are received by the first reception coil unit 21.
Further, alternating magnetic fields opposite to each other are generated from the first oscillation coil unit 11 and the second oscillation coil unit 12, and these magnetic fields are received by the second reception coil unit 22.
The detection process is switched every two sets.

  With such a configuration, the entire rope inspection apparatus 1100 can be made compact, and both the first receiving coil unit 21 and the second receiving coil unit 22 are the first oscillating coil unit 11 and the second oscillating coil. Since it is located in the middle of the part 12, it is not necessary to adjust the magnetic field intensity as shown in FIGS. 11B and 11C, and the accuracy of the inspection data can be improved.

(Fourth embodiment)
As shown in FIG. 15, in the rope inspection apparatus 1100 of the fourth embodiment, the first oscillation coil unit 11, the first reception coil unit 21, and the third oscillation coil unit 13 are arranged in order from the left on the upper side, and the lower side In addition, the fourth oscillation coil unit 14, the second reception coil unit 22, and the second oscillation coil unit 12 are arranged in this order from the left.

Then, alternating magnetic fields opposite to each other are generated from the first oscillation coil unit 11 and the third oscillation coil unit 13, and these magnetic fields are received by the first reception coil unit 21.
Further, alternating magnetic fields opposite to each other are generated from the fourth oscillating coil unit 14 and the second oscillating coil unit 12, and these magnetic fields are received by the second receiving coil unit 22.
The detection process is switched every two sets.

  With such a configuration, since the horizontal position of the oscillation coil and the reception coil are aligned every two upper and lower sets, it is possible to avoid the occurrence of inspection errors due to the horizontal position being shifted. Further, it is not necessary to adjust the magnetic field intensity as shown in FIGS.

(Fifth embodiment)
As shown in FIG. 16, in the rope inspection apparatus 1100 of the fifth embodiment, the first oscillation coil unit 11, the first reception coil unit 21, and the second oscillation coil unit 12 are arranged on the upper side in order from the left, and the lower side The third oscillation coil unit 13, the second reception coil unit 22, and the fourth oscillation coil unit 14 are arranged in order from the left.

Then, alternating magnetic fields opposite to each other are generated from the first oscillation coil unit 11 and the second oscillation coil unit 12, and these magnetic fields are received by the first reception coil unit 21.
Also, alternating magnetic fields that are opposite to each other are generated from the third oscillation coil unit 13 and the fourth oscillation coil unit 14, and these magnetic fields are received by the second reception coil unit 22.
The detection process is switched every two sets.

  With such a configuration, since the horizontal position of the oscillation coil and the reception coil are aligned every two upper and lower sets, it is possible to avoid the occurrence of inspection errors due to the horizontal position being shifted. Further, it is not necessary to adjust the magnetic field intensity as shown in FIGS. Furthermore, compared with the case of 4th Embodiment, the whole rope inspection apparatus 1100 can be compactized.

This is the end of the description of the embodiments, but the aspects of the present invention are not limited to these.
For example, the number of receiving coils may not be eight per receiving coil unit, but may be another number.
Further, step S2 in FIG. 12 may be performed by a digital filter.
In addition, about a concrete structure, it can change suitably in the range which does not deviate from the main point of this invention.

DESCRIPTION OF SYMBOLS 1 Main body part 11 1st oscillation coil part 12 2nd oscillation coil part 13 3rd oscillation coil part 14 4th oscillation coil part 21 1st receiving coil part 22 2nd receiving coil part 100 Wire rope 1000 Rope inspection system 1100 Rope inspection apparatus 1111 Switching unit 1120 AC generation unit 1130 Amplification / filter unit 1140 Control unit 1150 Analog-digital conversion unit 1160 Time adjustment / detection unit 1170 Downsampling unit 1180 Memory unit 1190 Data communication unit 1200 Evaluation device 1210 Data input unit 1220 Data processing unit 1230 Signal Control unit 1240 Output processing unit 1250 Storage unit 1260 Control unit 1300 Operation input unit 1400 Display unit 1500 Sensor unit 1501 Oscillation coil (1)
1511 Receiver coil (1) to (8)
1510 Sensor unit 1502 Oscillation coil (2)
1512 Receiver coils (9) to (16)
M inspection target

Claims (4)

A rope inspection device that generates inspection data regarding deterioration of a wire rope having a twisted structure in which a plurality of strands are twisted together,
An AC generator that generates an AC current of a predetermined frequency;
A first oscillating coil, a second oscillating coil, which are arranged shifted in the extending direction of the wire rope to be inspected and generate alternating magnetic fields opposite to each other based on the alternating current received from the alternating current generating unit;
Based on the magnetic field received from the first oscillation coil and the second oscillation coil, arranged in the middle of the first oscillation coil and the second oscillation coil or in the vicinity thereof, shifted in the circumferential direction of the wire rope to be inspected A plurality of receiving coils including first and second receiving coils that output magnetic field waveforms as the inspection data;
A switching unit connected to the plurality of receiving coils;
For the first receiving coil, the magnetic field generated in the first oscillating coil is controlled to be smaller than the magnetic field generated in the second oscillating coil, and generated in the second oscillating coil for the second receiving coil. A control unit that controls the plurality of receiving coils by the switching unit so that a magnetic field to be generated is smaller than a magnetic field generated by the first oscillation coil, and the plurality of receiving coils are sequentially operated;
A data processing unit that subtracts a component generated based on the twisted structure from the waveform of the inspection data. The controller is
Among the plurality of receiving coils, with respect to the receiving coil arranged to be shifted to one from the middle of the first oscillation coil and the second oscillation coil,
Of the first oscillation coil and the second oscillation coil, the first oscillation coil and the second oscillation are generated so that an alternating magnetic field generated by one of the first oscillation coil and the second oscillation coil is smaller than an alternating magnetic field generated by the other. The rope inspection device according to claim 1, wherein the magnitude of the alternating magnetic field generated from the coil is adjusted. An amplification / filter unit connected to the plurality of receiving coils via the switching unit;
A detection unit connected to the amplification / filter unit and detecting using a reference signal from the AC generation unit; and
The rope inspection device according to claim 1, wherein the detection unit deletes a predetermined period immediately after switching by the switching unit from the magnetic field waveforms obtained from the plurality of receiving coils. The rope inspection device according to any one of claims 1 to 3,
Based on the inspection data received from the rope inspection device, an evaluation device that executes an inspection process that identifies a deteriorated portion of the wire rope;
A rope inspection system comprising:

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