DAMAGE DETECTION DEVICE AND DAMAGE DETECTION METHOD

Abstract

A damage detection device and a damage detection method are provided that can easily detect damage to a wire rope. [Solution] A damage detection device comprising a probe that contacts the surface of a wire rope, an elastic wave sensor that detects elastic waves from the probe, and an evaluation unit that detects damage to the wire rope surface when the elastic wave sensor detects a signal of a predetermined waveform. When there is damage on the wire rope surface, the probe generates elastic waves when the probe is bounced off by the damage.

Description

[Technical field]

[0001] An embodiment of the present invention relates to a damage detection device and a damage detection method. [Background technology]

[0002] Wire ropes are widely used in industrial machinery, such as elevators and cargo handling machines. Wire ropes are made by twisting thin steel wires together to make strands, and then twisting multiple strands together around a rope core. This gives them great strength while maintaining their flexibility.

[0003] However, it is known that wire ropes used in hoists and the like can become damaged and eventually break through repeated use. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6797853 [Patent Document 2] International Publication No. 2011 / 158871 [Patent Document 3] JP 2018-54332 A Summary of the Invention [Problem to be solved by the invention]

[0005] For this reason, when inspecting wire ropes, it is essential to safe operation that damage (broken wires or deterioration) not be overlooked. Therefore, the present embodiment provides a damage detection device and a damage detection method capable of detecting damage to a wire rope. [Means for solving the problem]

[0006] The damage detection device of the embodiment comprises a probe that contacts the surface of the wire rope, an elastic wave sensor that detects elastic waves from the probe, and an evaluation unit that detects damage to the wire rope surface when the elastic wave sensor detects a signal of a predetermined waveform, and when there is damage on the wire rope surface, the probe generates elastic waves when the probe is bounced off by the damage.

[0007] In addition, in the damage detection method of the embodiment, a probe in contact with the wire rope surface is bounced off a damaged portion of the wire rope surface, generating an elastic wave, and damage to the wire rope surface is detected by detecting the elastic wave.

[0008] Here, damage to the wire rope surface refers to the unevenness or surface roughness of the wire rope surface, and includes not only dents caused by wear of the wires, etc., but also dents (gaps) in the surface caused by cutting. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a schematic configuration of a main part of a damage detection device according to a first embodiment. FIG. [Diagram 2] 2A to 2C are diagrams of the probe member shown in FIG. 1, where (a) is a plan view, (b) is a front view, and (c) is a right side view. [Diagram 3] 2A to 2C are diagrams showing the state in which the probe material shown in FIG. 1 is attached to a wire rope, in which (a) is a plan view showing the wire rope cut away, (b) is a front view, and (c) is a right side view. [Figure 4] 2 is a perspective view showing an outline of an installation state of the main part of the damage detection device shown in FIG. 1. FIG. [Diagram 5] 2 is a block diagram showing a detection processing process for elastic waves obtained by the damage detection device shown in FIG. 1. [Figure 6] 2 is a graph showing an elastic waveform obtained by the probe shown in FIG. 1 relative to time. [Figure 7] 1 is a graph showing the relationship between the time when a damaged portion of a wire rope is detected and the maximum amplitude value. [Figure 8] FIG. 8 is a graph showing an enlarged view of a part of the graph shown in FIG. [Figure 9] FIG. 11 is a perspective view showing the relationship between a probe member and a wire rope according to a second embodiment. [Figure 10] 10A and 10B are diagrams showing the relationship between the probe member and the wire rope shown in FIG. 9, where (a) is a side view and (b) is a front view showing the wire rope in section. [Figure 11] FIG. 11 is a perspective view showing a relationship between a probe material and an elastic wave sensor according to a modification of the second embodiment. [Figure 12] 1. FIG. 4 is a perspective view showing a modified example of the main part of the damage detection device shown in FIG. [Figure 13] 1. FIG. 4 is a perspective view showing a modified example of the main part of the damage detection device shown in FIG. [Figure 14] FIG. 4 is a plan view showing a modified example of the probe member according to the first embodiment. [Figure 15] FIG. 2 is a diagram showing modified examples of probe members according to the first embodiment, where (a) is a plan view of one probe member, and (b) is a plan view of the other probe member. [Figure 16] FIG. 11 is a diagram of a modified example of a probe material according to the first embodiment, where (a) is a perspective view of one of the probe materials, and (b) is a perspective view showing a state in which two probe materials are attached to a wire rope. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments will be described with reference to the drawings. The present invention is not limited to the embodiments. The same parts in the drawings are given the same numbers and detailed descriptions thereof are omitted as appropriate. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between parts, etc. are not necessarily the same as the actual ones. Even when the same part is shown, the dimensions and ratios of each part may be different depending on the drawing. (First embodiment) The first embodiment will be described with reference to FIGS. 1, the damage detection device 1 according to the first embodiment includes a probe 3 that contacts the surface of a wire rope W, an elastic wave sensor 5, and an evaluation unit 7 (see FIG. 5). In the first embodiment, the probe 3 and the elastic wave sensor 5 are fixed to a mounting material 9.

[0011] In this embodiment, the wire rope W is a wire rope that raises and lowers an elevator car, and three of them are arranged in a row. As shown in the cross-sectional view of Fig. 3(a), each of the wire ropes W1 to W3 (W) is an eight-strand wire rope W, with eight strands WT arranged around a core rope WC, and each strand WT has a number of wires WS.

[0012] The probe 3 is repelled by damage if there is damage on the surface of the wire rope W, and is in contact with the surface of each wire rope W with a pressing force due to external compression or its own deformation. As shown in Fig. 2, the probe 3 is made of a probe material 3A, which is a spring plate having a substantially rectangular shape in a plan view. The probe material 3A has a tensile strength of 780 [N / mm 2 ]930[N / mm] or more 2 ] is less than. The probe member 3A includes a fixed portion 3B that is fixed to a mounting member (described later), and a probe 3 that applies a pressing force in the radial direction of the wire rope W to come into contact with the surface of the wire rope W. As shown in Figures 2 and 3, multiple probes 3 are arranged in a line around the circumference of the wire rope W, and the tip portions 3C of the multiple probes 3 form a ring having a concentric outer diameter r (see Figures 3(a) and 2(c)) smaller than the outer diameter R of the wire rope W (see Figures 3(a) and 3(c)). Each tip portion 3C of the probes 3 is divided into the probe material 3A by cuts K formed radially from the ring in proportion to the number of strands WT of the wire rope W. In the first embodiment, the wire rope W has eight strands WT and 32 incisions K, and 32 probes 3, which is four times the number of strands WT, are formed along the circumference of the wire rope W. The probe 3 has at least one contact point for each strand WT of the wire rope W, and one incision KS of the incisions K reaches the outer peripheral edge 3E of the probe material 3A. The probe material 3A is plate-shaped and has a thickness T1 smaller than the diameter of the wire WS of the wire rope W. In the first embodiment, the thickness T1 (see FIG. 2(c)) of the probe material 3A is preferably about 0.1 mm to about 0.3 mm, and is about 0.1 mm in this embodiment. The diameter of the wire WS (see FIGS. 3(a) and 3(c)) is, for example, about 1.3 mm.

[0013] Next, the elastic wave sensor 5 and its mounting member 9 will be described with reference to FIG. The elastic wave sensor 5 detects elastic waves from the probe 3, and in the first embodiment, two elastic wave sensors 5A and 5B are provided for one mounting member 9. In the first embodiment, the mounting material 9 is composed of two mounting materials 9A and 9B, each of which is also a transmission member that transmits the elastic waves of the probe 3 and is made of magnetic steel. Each elastic wave sensor 5 is a resonant type AE (Acoustic Emission) sensor having a resonant frequency between 50 KHz and 180 KHz, and detects an AE waveform having an amplitude for each time period as shown in FIG.

[0014] 1, the elastic wave sensor 5 is housed in a sensor holder 11. The sensor holder 11 is composed of one sensor holder 11A and the other sensor holder 11B, two of which are provided on each of the mounting members 9A and 9B. The sensor holder 11 includes left and right magnet mounting portions 17, 17 and a sensor mounting portion 19 provided between the magnet mounting portions 17, 17, and the elastic wave sensor 5 is housed in the sensor mounting portion 19. The elastic wave sensor 5 is housed in the sensor holder 11 and is biased from above toward the mounting material 9 by a plunger (not shown) so as to be in intimate contact with the mounting material 9.

[0015] The mounting material 9 has a wire rope storage groove 21 formed in the center of its width so that the wire rope W is positioned in a row, and two sensor holders 11A, 11B are provided at a distance from each other on the side of one of the two bands 23A, 23B that sandwich the wire rope storage groove 21, that is, the band 23A side. The interval between the two sensor holders 11A and 11B is approximately the same as or wider than the interval M at which the three wire ropes W are arranged side by side. Each of the three probe members 3A is attached to a wire rope W, and each of the two fixing portions 3B is fixed to one band 23A of the mounting member 9 and the other band 23B.

[0016] Next, the installation position of the mounting material 9 relative to the elevator wire rope W will be described. The wire rope W that is the detection target of the damage detection device 1 according to this embodiment is an elevator wire rope. As shown in Figure 4, the installation position of the mounting material 9 is set up on a beam 13A on which the elevator hoist 13 is installed, by installing a frame 15 with a wall surface, and the mounting material 9 is installed between the elevator hoist main sheave 14 and secondary sheave 16 in a direction perpendicular to the longitudinal direction of the wire rope W.

[0017] Next, the configuration of the evaluation unit 7 will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the overall configuration of the damage detection device 1, and for the purpose of explanation, it shows a schematic diagram of the positional relationship between the wire ropes W1, W2, and W3 for one mounting member 9, the probe a (3), the probe b (3), and the probe c (3) attached to each rope W1, W2, and W3, and the elastic wave sensors 5A and 5B. That is, the probe a in Fig. 5 corresponds to the probe 3A of the wire rope W1 attached to one mounting member 9A in Fig. 1, the probe c in Fig. 5 corresponds to the probe 3A of the wire rope W3 attached to one mounting member 9A in Fig. 1, and the probe b in Fig. 5 corresponds to the probe 3A of the wire rope W2 attached to the other mounting member 9B in Fig. 1. As is clear from FIG. 5, elastic wave sensor 5A is positioned closer to wire rope W1, elastic wave sensor 5B is positioned closer to wire rope W3, and wire rope W2 is positioned approximately equidistant from the two elastic wave sensors 5A and 5B.

[0018] The evaluation unit 7 is connected in this order to an amplifier 27, a bandpass filter 29, and an AD converter 31, which are connected to each of the elastic wave sensors 5A and 5B. Connected downstream of the AD converter 31 are a feature extraction unit 33, a position locating unit 35, and a damage detection unit 37, which are provided in common to the elastic wave sensors 5A and 5B. A car position sensor 39 is connected to the position locating unit 35. The car position sensor 39 is a sensor provided for each elevator floor, and detects the time when the elevator car (not shown) passes through each floor (shown by a two-dot chain line in FIG. 7). 8, the feature extraction unit 33 compares a first feature TE1 of the AE waves detected by each of the elastic wave sensors 5A and 5B with a second feature TE2, which is the same type of physical quantity as the first feature TE1, to identify the detection signal. For example, a detection signal TE2 having a low amplitude corresponding to each TE1 is due to reflection or the like, and therefore TE2 is not regarded as a detection signal.

[0019] Next, the damage detection operation of the evaluation unit 7 will be described. The evaluation unit 7 detects the AE waves (see FIG. 6) detected by the elastic wave sensors 5A and 5B, and evaluates the damage to the wire rope surface by comparing the amplitude value exceeding a threshold and the duration of the detected AE waves. In FIG. 6, the dashed line H indicates the threshold. The damaged portion is detected, and the position of the damaged portion is identified based on information on the amount of movement of the generated elastic waves of the wire rope W. In this embodiment, three wire ropes W1 to W3 are arranged in parallel, and the two elastic wave sensors 5A and 5B identify one of the damaged wire ropes W1 to W3 based on the difference in arrival time of the amplitude values ​​exceeding a threshold value. The wire rope W2, which is in the middle of the three wire ropes W1 to W3, is detected by the two elastic wave sensors 5A and 5B at approximately the same time.

[0020] Regarding the above-mentioned first embodiment, an experiment was conducted to search for damaged parts during inspection of the wire rope of an elevator by installing a mounting member 9 on the hoist 13 as shown in FIG. 4, and the results will be described. Fig. 7 shows the detection results when an elevator car (not shown) is lowered by wire ropes W1 to W3 from the rooftop (fourth floor) to the lobby floor (first floor). In Fig. 7, the horizontal axis represents time, and the vertical axis represents the peak amplitude value (Peak amp (dB)) of the waveform signal and the external input voltage (Ext.Param.0 (mv)) that detects the passage of the car position sensor 39. FIG. 8 shows an enlarged view of the area between the second and third floors in FIG. As can be seen from Figure 8, one elastic wave sensor 5A and the other elastic wave sensor 5B detected amplitude values ​​of a peak waveform signal greater than an amplitude value of approximately 70 dB, and the relationship between time and the car speed indicates that damage occurred at three locations W1 to W3 spaced 300 mm apart. As shown in Figure 8, the detected waveform L (approximately 84 dB) was compared to the background noise J (approximately 74 dB), and therefore the elastic waves generated from the damaged area located between the second and third floors, where the elevator stops, were detected with an S / N ratio of more than 10 dB. Therefore, an inspector can again check for damaged areas by visually inspecting the wire ropes W1 to W3 between approximately 7 seconds and approximately 12 seconds after the car passes the third floor when it is descending.

[0021] The effects of the first embodiment will be described. According to the first embodiment, as shown in Figure 1, the probe 3 is in contact with the surface of the wire rope W, and if there is damage, it is bounced off and generates an elastic wave (see Figure 6).Therefore, as shown in Figure 5, the evaluation unit 7 detects this elastic wave, thereby making it possible to detect damage to the wire rope W. The damage detection device 1 has a simple configuration, as it is configured to include a probe 3 that contacts the surface of the wire rope W, an elastic wave sensor 5 that detects elastic waves from the probe 3, and an evaluation unit 7 that detects damage to the surface of the wire rope W when the elastic wave sensor 5 detects a signal of a predetermined waveform. In the evaluation unit 7, the feature extraction unit 33 detects whether or not the signal of a predetermined waveform from the elastic wave sensor 5 exceeds a predetermined threshold, and also identifies the detection signal by comparing the first feature TE1 of the AE wave detected by each of the elastic wave sensors 5A and 5B with the second feature TE2, which is the same type of physical quantity as the first feature TE1, as shown in Fig. 8, so that erroneous detection can be prevented. That is, in this embodiment, since the detection signal TE2 having a low amplitude corresponding to each TE1 is due to reflection or the like, TE2 is not considered to be a detection signal.

[0022] The probe 3 is made of a spring material, and the tip portion 3C simply applies a pressing force to the wire rope W in its radial direction, so that the probe 3 has a simple structure and is easy to manufacture. As shown in Figure 3, multiple probes 3 are formed on the probe material 3A, and the tips 3C of the multiple probes 3 form a ring that is smaller than the outer diameter of the wire rope W and concentric with the wire rope W. The ring is divided by notches K formed radially from the ring in proportion to the number of strands WT of the wire rope W, and has at least one contact point for each strand WT of the wire rope W, so that the probe 3 can reliably detect damage to each strand WT that makes up the wire rope W. Furthermore, as shown in Figures 2 and 3, there is a notch KS that reaches the outer peripheral edge 3E of the probe material 3A. Therefore, when attaching the probe material 3A to the wire rope W, one of the parts separated from the notch KS is pulled toward you (pulled toward you relative to the paper surface shown in Figure 2) and the other is pushed in (pressed against the paper surface shown in Figure 2), so that even if the tips 3C of the multiple probes 3 form a ring that is smaller than the outer diameter of the wire rope W and concentric with the wire rope W, a large space can be formed in the probe material 3A to attach the wire rope W.

[0023] The probe 3 is plate-shaped and has a thickness smaller than the diameter of the wires WS of the wire rope W, so that the probe 3 is flexible and unlikely to break even when it is folded back to one side and the other side in the longitudinal direction of the wire rope W. Therefore, damage can be detected whether the wire rope W runs on either side in the longitudinal direction. Furthermore, if the wire rope W is run only on one side or the other side in its longitudinal direction, the probe 3 will not be folded back regardless of the thickness of the probe 3, and therefore its service life can be extended. Since the fixing portion 3B of the probe member 3A is provided on the mounting member 9 on which the elastic wave sensor 5 is mounted, the elastic waves of the probe 3 can be easily received by the elastic wave sensor 5. The mounting member 9 is made of a magnetic material, and the elastic wave sensor 5 is housed in a sensor holder 11 with a magnet and fixed to the fixing member by magnetic force, so that the elastic wave sensor 5 can be easily attached to the sensor mounting member 9 by magnetic force.

[0024] As shown in Fig. 4, in an elevator, the mounting material 9 is installed between the main sheave 14 and secondary sheave 16 of the hoisting machine 13 in a direction perpendicular to the length direction of the rope, so that by installing it between the main sheave 14 and secondary sheave 16 where a stable tension is applied to the wire rope W, noise caused by twisting and oscillation of the wire rope W is avoided, and detection accuracy is improved. In addition, by contacting the wire rope W immediately after it passes through the main sheave 14, there is an effect that the progression of damage in the event of a crack occurring at the timing of passing through the main sheave 14 can be detected early. As shown in FIG. 5, the elevator is equipped with a car position sensor 39 that detects the position of the elevator car and acquires car position information, so that the location of damage to the wire rope W can be easily determined from the position of the car. As shown in Fig. 1, multiple mounting members 9A, 9B are used to determine the wire ropes W1 to W3 to be detected by each mounting member 9A, 9B, so that multiple mounting members 9A, 9B can be installed offset to simultaneously detect damage to multiple wire ropes W1 to W3. Note that when only a single wire rope W is to be inspected by one mounting member 9, only one sensor may be used.

[0025] Other embodiments will be described below. In the embodiments described below, the parts that have the same action and effect as the first embodiment described above will be given the same reference numerals and the description of those parts will be omitted. The following description will mainly focus on the points that are different from the first embodiment. The second embodiment will be described with reference to FIGS. As shown in FIG. 9, the second embodiment differs from the first embodiment in the shape and number of the probe member 3A and the probes 3. Four probe members 3A are provided around the wire rope W so as to surround it on all four sides. Each probe member 3A has three bent portions 41a, 41b, and 41c formed in the longitudinal direction of the band-shaped sheet metal, and has a spring constant in the longitudinal direction. The fixed portion 3B of the probe member 3A is fixed to a mounting member 9, which is not shown in the figure. The tip portion 3C of the probe 3 has a contact surface that matches the circumferential surface of the wire rope W, and is pressed with a pressing force in the radial direction of the wire rope W by being fixed to a mounting plate 9 (not shown). Fig. 10 (a) shows a side view of the wire rope W, and (b) shows the appearance of a front view showing a cut-away view of the wire rope W. By pressing the tip portions 3C of the four probes 3 against the four divided surfaces of the circumferential surface of the wire rope W, respectively, the circumferential direction of the wire rope W can be scanned without missing anything. The other configurations are similar to those of the first embodiment.

[0026] According to the second embodiment, it is possible to obtain the same effects as in the first embodiment, and damage to the circumferential surface of the wire rope W can be detected with a small number of probes 3, that is, four. The probe 3 is easy to manufacture because the three bent portions 41a, 41b, and 41c are formed in the longitudinal direction of a strip-shaped metal sheet.

[0027] 11 shows a modified example of the second embodiment, in which an elastic wave sensor 5 is provided on the fixed portion 3B of the probe member 3A. According to the modified example of the second embodiment, the elastic wave generated in the probe 3 can be directly detected.

[0028] FIG. 12 shows a modification of the first embodiment. In this modification, the shape of mounting material 9, the shape of sensor holder 11, and the method of fixing sensor holder 11 to mounting material 9 are different. That is, there are cases where the rope pitch of the wire rope W is narrow, such as in an elevator. In the modified example shown in FIG. 12, the subject shown here is an example of only three wire ropes W. The bands 23A, 23B forming each mounting member 9A(9), 9B(9) are separated, and each band 23A, 23B has a U-shaped recessed notch 42 formed on the opposing sides. Each band 23A, 23B is installed so that its plane is perpendicular to the length direction of the wire rope W, and the inside of the probe 3 is fixed so that it contacts the entire circumference of the wire rope W. The probe material 3A, in which the probe 3 is formed in the circumferential direction, has a dimension that does not interfere with the adjacent wire rope W. As shown in FIG. 12, two mounting members 9A, 9B are installed on the adjacent wire ropes W with an offset in the length direction of the wire rope W, and the probe material 3A is fixed. At least two sensor holders 11 housing elastic wave sensors 5 are arranged symmetrically with respect to the center in the width direction of each mounting material 9A(9), 9B(9). This makes it possible to identify damaged wire ropes W1-W3 based on the difference in arrival time when the elastic wave sensor 5 detects elastic waves (AE waves). In this embodiment, the sensor holders 11 are fixed to the corresponding bands 23A, 23B by handles 46 integrated with a magnet and compression spring to bias the sensor surfaces. In this modified example, when there is not enough clearance around the wire rope W, the mounting material 9 can be easily handled because it can be divided into two bands 23A and 23B on one side and the other side of the wire rope W. In this case, since a boundary surface or gap is generated in the divided mounting material 9, a separate vibration transmission plate 44 is provided to bridge the boundary surface and ensure a propagation path for elastic waves from both mounting materials 9 to the detection surface of the elastic wave sensor 5.

[0029] The modified example shown in FIG. 13 illustrates an example in which two sensor holders 11 are provided for only one wire rope W. In this modified example, similarly to the first embodiment, damage to even a single wire rope W can be easily detected.

[0030] Fig. 14 shows a modified example of the probe 3 and the probe member 3A. In this modified example, the probe 3 does not have the fold 3F (see Fig. 2(a)) at its base. Even in this modified example, by attaching the probe member 3A to the wire rope W, a fold is formed, and the tip portion 3C of the probe 3 can come into contact with the surface of the wire rope W.

[0031] A modified example of the probe 3 and the probe material 3A is shown in Fig. 15. In this modified example, the probe material 3A is configured by overlapping one probe material 43A shown in Fig. 15(a) with the other probe material 43B shown in Fig. 15(b), so that the probe 3 is disposed over the entire peripheral surface of the wire rope W. Each of the probe members 43A and 43B has a probe 3 formed thereon corresponding to half of the circumference of the wire rope W. Also, each of the probe members 43A and 43B has an insertion groove 45 for the wire rope W formed on one side. According to each of the probe materials 43A and 43B shown in FIG. 15, by inserting each of the probe materials 43A and 43B into the wire rope W through the insertion groove 45 and stacking and fixing them, the probes 3 can be arranged around half of the entire circumference of the wire rope W, so that the probes 3 can be easily arranged around the entire circumference of the wire rope W.

[0032] A modified example of the probe 3 and the probe material 3A is shown in Fig. 16. In this modified example, as shown in Fig. 16(a), the probe material 3A is divided into two pieces, and the upper and lower sides of each divided part (probe material) 47 are sandwiched between upper and lower mounting members 49A, 49B to form one of the probe materials 51A.

[0033] As shown in FIG. 16(b), two of these probe materials 51A are used, and one of them is turned upside down and attached so that the wire rope W is sandwiched between each divided part 47, so that the tip 3C of the probe 3 is brought into contact with the wire rope W. According to this modification, by using two of the probe members 51A on one side and attaching them so that the wire rope W is sandwiched between the divided parts 47, the probe 3 can be easily arranged around the wire rope W. [Explanation of symbols]

[0034] 1 Damage detection device 3 transducer 3A, 43A, 43B, 47 Probe material 3B Fixed part 3C Tip 3E Outer edge 5. Elastic wave sensor 7 Evaluation section W Wire Rope WT Strand WS wire

Claims

1. The wire rope measuring device includes a probe that contacts a surface of the wire rope, an elastic wave sensor that detects elastic waves of the probe, and an evaluation unit that detects damage to the surface of the wire rope when the elastic wave sensor detects a signal having a predetermined waveform, The probe generates an elastic wave when the probe is bounced off the surface of the wire rope when the surface of the wire rope is damaged, A damage detection device in which the evaluation unit has a propagation velocity detection unit for the elastic wave, a time difference information detection unit for detecting time difference information between multiple detection times of the elastic waves detected by multiple elastic wave sensors, and a position information detection unit for indicating the position of each of the elastic wave sensors.

2. The damage detection device of claim 1, wherein the probe is made of spring material and has a fixed portion fixed to a mounting member and a tip portion that applies a pressing force in the radial direction of the wire rope to contact the surface of the wire rope.

3. 2. The damage detection device according to claim 1, wherein the probes are formed in a plurality of probes on the probe material, the tips of the probes form a concentric ring with the wire rope which is smaller than the outer diameter of the wire rope, the tips of the probes are divided by notches formed radially from the ring in proportion to the number of strands of the wire rope, and have at least one contact point for each strand of the wire rope, and one of the notches reaches the outer peripheral edge of the probe material.

4. 2. The damage detection device according to claim 1, wherein the probe is plate-shaped and has a thickness smaller than a diameter of the wires of the wire rope.

5. The damage detection device according to claim 2 , wherein the fixing portion of the probe is provided on a sensor mounting member on which the elastic wave sensor is mounted.

6. 6. The damage detection device according to claim 5, wherein the sensor mounting member is made of a magnetic material, and the elastic wave sensor is housed in a holder with a magnet and fixed to the sensor mounting member by magnetic force.

7. 2. The damage detection device according to claim 1, wherein the wire ropes are a plurality of main ropes used in an elevator and are installed between a main sheave and a secondary sheave of the elevator.

8. The damage detection device according to claim 7 , further comprising a position information detection unit that detects a position of the elevator car and acquires car position information indicating a position of the car according to time.

9. A damage detection method for detecting damage to a wire rope surface, comprising: a probe in contact with the wire rope surface is bounced off a damaged portion of the wire rope surface, generating an elastic wave; and detecting the elastic wave, the damage being detected on the wire rope surface; The wire ropes are multiple, and each wire rope has an elastic wave sensor with a probe that contacts each surface, and the damage detection method detects the propagation speed of the elastic wave for each rope and detects the time difference between the detection times of each elastic wave to identify the location of damage.

10. The damage detection method according to claim 9, wherein the wire ropes are a plurality of main ropes used in an elevator, and damage to the surface of the wire ropes is detected between a main sheave and a secondary sheave of the elevator.

11. A damage detection method as described in claim 10, which detects the position of the elevator car, obtains car position information indicating the position of the car according to the time, and detects the location of damage on the wire rope surface.

12. The damage detection method according to claim 9, wherein the wire rope runs in only one direction along its length.

13. The probe has a tensile strength of 780 [N / mm ２ ] or more than 930 [N / mm ２ 10. The damage detection method according to claim 9, wherein the distance between the first and second electrodes is less than 10 mm.

14. The wire rope measuring device includes a probe that contacts a surface of the wire rope, an elastic wave sensor that detects elastic waves of the probe, and an evaluation unit that detects damage to the surface of the wire rope when the elastic wave sensor detects a signal having a predetermined waveform, The probe generates an elastic wave when the probe is bounced off the surface of the wire rope when the surface of the wire rope is damaged, A damage detection device in which multiple probes are formed on a single plate, and the tips of the multiple probes form a concentric ring with the wire rope which is smaller than the outer diameter of the wire rope, and each tip of the probe is divided by notches formed radially from the ring in proportion to the number of strands of the wire rope, and has at least one contact point for each strand of the wire rope, and one of the notches reaches the outer peripheral edge of the plate.

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