Cable defect detection device and method for detecting defects in a cable

Abstract

A cable defect detection device (1a) is provided with a sensor portion (3) having a magnetizer that magnetizes a cable (2) and a magnetic sensor that detects magnetic flux leakage due to a damaged portion of the cable (2). Further, the cable defect detection device (1a) is provided with a moving shaft (14a) that enables the sensor portion (3) to move in the arrangement direction of the cable (2), a front-rear shaft (15a) that guides the sensor portion (3) in a direction away from the cable (2), and a receiving surface portion (19a) that faces the sensor portion (3) across the cable (2). The sensor portion (3) is pressed against the cable (2) along the front-rear shaft (15a). The moving shaft (14a) enables the sensor portion (3) to move relative to the receiving surface portion (19a).

Description

Technical Field

[0001] This disclosure relates to a cable flaw detection device and a cable flaw detection method. Background Technology

[0002] Patent Document 1 discloses a cable flaw detection device. The cable flaw detection device described in Patent Document 1 includes: a magnetization unit that magnetizes the cable along its length; and a sensor unit that detects magnetic flux leaking from a damaged portion of the cable magnetized by the magnetization unit.

[0003] The cable flaw detection device described in Patent Document 1 includes a structure configured to face the sensor unit across a cable. This prevents cable bending and improves flaw detection accuracy.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 5331173 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In the cable flaw detection device described in Patent Document 1, when detecting multiple cables arranged in a row, the sensor unit needs to be separated from the structure and reassembled each time a cable is tested. In the prior art described in Patent Document 1, there is a problem that the operation time required for flaw detection increases when detecting multiple cables arranged in a row.

[0009] This disclosure was made to solve the problems described above. The purpose of this disclosure is to provide a cable inspection apparatus and method that can perform high-precision inspection on multiple cables arranged in a shorter operation time.

[0010] Methods for solving problems

[0011] The cable flaw detection device disclosed herein includes a sensor unit comprising a magnetizer and a magnetic sensor. The magnetizer magnetizes the cable, and the magnetic sensor detects leakage magnetic flux caused by damage to the cable. Furthermore, the cable flaw detection device includes: a movable shaft that allows the sensor unit to move in the cable's orientation direction; a guide shaft that guides the sensor unit in a direction away from the cable; and a bearing surface that faces the sensor unit across the cable. The sensor unit is pressed against the cable along the guide shaft. The movable shaft allows the sensor unit to move relative to the bearing surface.

[0012] The cable flaw detection method disclosed herein uses a cable flaw detection device, which includes: a sensor unit having a magnetizer and a magnetic sensor, the magnetizer magnetizing the cable and the magnetic sensor detecting leakage magnetic flux caused by damage to the cable; and a bearing surface facing the sensor unit across the cable. The cable flaw detection method of this disclosure includes: a first step of measuring the first cable by clamping it between the sensor unit and the bearing surface; a second step of moving the sensor unit relative to the bearing surface in the cable arrangement direction to a position of the second cable after the first step; and a third step of clamping the second cable between the sensor unit and the bearing surface after the second step to measure the second cable.

[0013] Invention Effects

[0014] According to the cable flaw detection device and method disclosed herein, multiple cables arranged in a row can be flawed with high precision in a shorter operation time. Attached Figure Description

[0015] Figure 1 This is a perspective view showing the cable flaw detection device according to Embodiment 1.

[0016] Figure 2 This is a perspective view showing the cable flaw detection device of Embodiment 1 installed on a cable.

[0017] Figure 3 This is a perspective view showing the internal structure of the sensor section of the cable flaw detection device according to Embodiment 1.

[0018] Figure 4 This is a cross-sectional schematic diagram of the cable flaw detection device according to Embodiment 1.

[0019] Figure 5 This is an explanation Figure 4 A diagram of localized magnetic flux leakage in the image.

[0020] Figure 6 This is a flowchart illustrating the cable flaw detection method of Embodiment 1.

[0021] Figure 7 This is a perspective view of a cable flaw detection device according to a first variation of Embodiment 1.

[0022] Figure 8 This is a perspective view of a cable flaw detection device according to a second variation of Embodiment 1.

[0023] Figure 9 This is a perspective view of the cable flaw detection device shown in the third variation of Embodiment 1.

[0024] Figure 10This is a perspective view showing the cable flaw detection device of the third variation of Embodiment 1 installed on a cable. Detailed Implementation

[0025] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, in the drawings, the same or corresponding elements are labeled with the same reference numerals, and repeated descriptions are simplified or omitted in this disclosure. Additionally, this disclosure is not limited to the embodiments described below, and may include all combinations and variations of the structures disclosed in the following embodiments.

[0026] Implementation method 1.

[0027] Figure 1 This is a perspective view showing the cable flaw detection device 1a according to Embodiment 1. Figure 2 This is a perspective view showing the state in which the cable flaw detection device 1a of Embodiment 1 is installed on the cable 2. Figure 3 This is a perspective view showing the internal structure of the sensor unit 3 included in the cable flaw detection device 1a according to Embodiment 1. Figure 3 The sensor unit 3 is shown in detail with the protective cover 4 removed.

[0028] The cable flaw detection device 1a comprises a sensor unit 3 and a mounting unit 5, which constitutes the parts other than the sensor unit 3, as its main components. The sensor unit 3 includes a magnetizer that magnetizes the cable 2, and a magnetic sensor 6 that detects leakage magnetic flux generated due to damage to the cable 2 after it has been magnetized by the magnetizer. The mounting unit 5 presses the sensor unit 3 against the cable 2 using a spring or similar component. This maintains the relative positional relationship between the sensor unit 3 and the cable 2. The mounting unit 5 ensures the detection accuracy of the magnetic sensor 6 in detecting the aforementioned leakage magnetic flux.

[0029] The magnetizer of the sensor section 3 forms the main magnetic circuit within a predetermined axial range of the cable 2. The magnetizer, for example, consists of a back yoke 7, a pair of permanent magnets 8a and 8b for excitation, and magnetic pole pieces 9a and 9b. The back yoke 7, magnetic pole pieces 9a and 9b are formed of a strongly magnetic material such as iron. The pair of permanent magnets 8a and 8b are respectively arranged on both ends of the back yoke 7 with their polarities opposite to each other. Magnetic pole piece 9a is arranged on the side of the permanent magnet 8a opposite to the back yoke 7. Magnetic pole piece 9b is arranged on the side of the permanent magnet 8b opposite to the back yoke 7. Magnetic pole pieces 9a and 9b are formed in a U-shape along the outer circumference curvature of the cable 2.

[0030] The magnetic sensor 6, which detects leakage flux, consists of a coil and a Hall element. The magnetic sensor 6 is assembled on a support platform 10. The support platform 10 is magnetically insulated from the magnetizer, which consists of permanent magnets 8a and 8b, magnetic pole pieces 9a and 9b, and a back yoke 7. The support platform 10, on which the magnetic sensor 6 is assembled, is connected to the back yoke 7 via a non-magnetic component 11, in a manner that is magnetically insulated from the main magnetic circuit formed by the magnetizer.

[0031] To prevent magnetic flux other than the leakage flux from the cable 2 from mixing into the magnetic flux detected by the magnetic sensor 6, the support platform 10 is preferably made of a strongly magnetic material. To prevent leakage current from the magnetic sensor 6 to the support platform 10, an insulating coating is preferably applied to the surface of the support platform 10. Furthermore, as... Figure 3 As shown, it is preferable that the magnetic sensor 6 and the support platform 10 are formed in a U-shape, similar to the magnetic pole pieces 9a and 9b. This allows the magnetic sensor 6 to approach the cable 2 over a wider range, thereby expanding the detection range for damaged portions of the cable 2. Furthermore, the support platform 10 can also be made of a non-magnetic material. Alternatively, the magnetic sensor 6 and the support platform 10 can be formed as planar components with their surfaces facing the center of the cable 2.

[0032] Figure 4 This is a cross-sectional schematic diagram of the cable flaw detection device 1a. Figure 4 The diagram illustrates the flow of magnetic flux when the damaged section 12 of cable 2 passes near the magnetic sensor 6. (As shown...) Figure 4 As shown, the main magnetic flux generated from the permanent magnet 8a passes through the cable 2, through the permanent magnet 8b, through the back yoke 7, and returns to the permanent magnet 8a. The local leakage magnetic flux 13 generated near the damaged part 12 of the cable passes through the protective cover 4 (which is a non-magnetic body), the magnetic sensor 6, and the support platform 10, and returns to the cable 2.

[0033] Figure 5 This is an explanation Figure 4 The diagram shows the local leakage flux 13 in the image. Figure 5 (a) is shown Figure 4 A magnified view of the flow of local leakage flux 13 in the image. Figure 5 (b) is a graph showing the magnetic flux density distribution in the radial direction x of cable 2. Figure 5 Curves a, b, and c in graph (b) respectively show Figure 5 The magnetic flux density distribution at the locations of dotted lines a, b, and c in (a).

[0034] The localized leakage flux 13 flowing out to the outside of cable 2 attempts to return to cable 2 via the shortest possible magnetic path. Therefore, the area of ​​the localized leakage flux 13 distributed on the outside of cable 2 becomes smaller. As the flux density distribution decreases along the axial and radial directions of cable 2, originating from the cable damage section 12, the distribution becomes smaller. Therefore, if the distance between cable 2 and magnetic sensor 6 is large, the signal strength detected by magnetic sensor 6 will be low.

[0035] Furthermore, in order to generate localized magnetic flux leakage 13 through the cable damage section 12, it is necessary to magnetically saturate the cable 2. If there is no magnetic saturation within the cable 2, even if the cable damage section 12 exists, the magnetic flux will not leak from the cable 2, but will instead pass through areas within the cable 2 with relatively low magnetic flux density.

[0036] On the other hand, when the cable 2 is magnetically saturated, a significant amount of magnetic flux will leak from locations other than the damaged section 12. This leaked magnetic flux will pass through the magnetic sensor 6. Therefore, if the relative positional relationship between the cable 2 and the magnetic sensor 6 changes, the magnetic flux passing through the magnetic sensor 6 will also change. This change in the relative positional relationship between the cable 2 and the magnetic sensor 6 becomes a source of noise in the detection of leaked magnetic flux. If the noise increases, the signal detected by the magnetic sensor 6 will be buried in the noise, resulting in a decrease in the detection accuracy of the cable flaw detection device 1a in detecting the damaged section 12 of the cable. Hereinafter, the detection accuracy of the cable flaw detection device 1a in detecting the damaged section 12 of the cable will also be referred to as "flaw detection accuracy".

[0037] To ensure flaw detection accuracy, the relative positional relationship between the cable 2 and the magnetic sensor 6 needs to be maintained. A magnetic force is generated on the cable 2 by permanent magnets 8a and 8b to attract it to the sensor section 3. This magnetic force presses the cable 2 against the protective cover 4 of the sensor section 3. Thus, the relative positional relationship between the cable 2 and the magnetic sensor 6 is maintained.

[0038] To completely suppress vibrations generated during the movement of cable 2, it is considered to enhance the aforementioned magnetic force or add forces other than magnetic force. In this embodiment, as an example of a method with less noise and cost advantages, the method of adding forces other than magnetic force will be described.

[0039] The mounting part 5 of this embodiment has the function of generating a force other than magnetic force to maintain the relative positional relationship between the cable 2 and the magnetic sensor 6. The mounting part 5 with this function includes a moving shaft 14a and a moving shaft 14b, which allow the sensor part 3 to move in the arrangement direction of the cable 2. Furthermore, the mounting part 5 includes front and rear shafts 15a and 15b as guide shafts to guide the sensor part 3 in the direction away from the cable 2.

[0040] The mounting section 5 includes a middle section 16a and a middle section 16b, which move along the front and rear axes 15a and 15b, respectively, just like the sensor section 3. Moving shafts 14a and 14b are respectively disposed in the middle sections 16a and 16b. Furthermore, the mounting section 5 includes a base section 17a, which is fixed to a structure surrounding the cable 2. The front and rear axes 15a and 15b are disposed in the base section 17a.

[0041] Furthermore, as an example, the mounting part 5 includes springs 18a and 18b, which generate a force pressing the sensor part 3 against the cable 2. Spring 18a is arranged parallel to the front and rear shafts 15a. Spring 18b is arranged parallel to the front and rear shafts 15b. Springs 18a and 18b press the sensor part 3, the moving shaft 14a, the moving shaft 14b, the intermediate part 16a, and the intermediate part 16b into the cable 2 along the front and rear shafts 15a and 15b. Additionally, the mounting part 5 includes a bearing surface 19a, which faces the sensor part 3 across the cable 2. In this embodiment, the bearing surface 19a is configured to be able to be mounted and detached relative to the base part 17a.

[0042] The moving shaft 14a passes through the hole provided in the sensor section 3. Similarly, the moving shaft 14b also passes through the hole provided in the sensor section 3. The two axial ends of the moving shaft 14a are supported by the intermediate portion 16a. The two axial ends of the moving shaft 14b are supported by the intermediate portion 16b. With this structure, the sensor section 3 can move along the moving shafts 14a and 14b. Furthermore, by having both the moving shafts 14a and 14b pass through the sensor section 3, the tilting of the sensor section 3 is restricted.

[0043] Furthermore, the mechanism enabling the sensor unit 3 to move in the direction of the cable 2 is not limited to the mechanism consisting of the moving shafts 14a and 14b described above. For example, the sensor unit 3 can also be moved in the direction of the cable 2 by using a linear guide. More specifically, a guide rail can be provided instead of the moving shafts 14a and 14b on the basis of mounting the block on the side of the sensor unit 3, allowing the sensor unit 3 to move along the guide rail. The movement of the sensor unit 3 can also be smoothed by adding a metal bushing or a non-lubricated bushing or a ball bushing to the hole in the sensor unit 3. In addition, a protrusion can be provided in the sensor unit 3 instead of the hole, and holes can be provided in the intermediate portions 16a and 16b instead of the moving shafts 14a and 14b. By allowing the protrusion provided in the sensor unit 3 to pass through the holes provided in the intermediate portions 16a and 16b, the sensor unit 3 can also be moved. Thus, various known moving mechanisms can be used to enable the sensor unit 3 to move in the direction of the cable 2.

[0044] The front and rear shafts 15a pass through a hole provided in the intermediate portion 16a. One axial end of the front and rear shafts 15a is supported by the base portion 17a. Similarly, the front and rear shafts 15b also pass through a hole provided in the intermediate portion 16a. One axial end of the front and rear shafts 15b is supported by the base portion 17a. With this structure, the sensor portion 3 can move along the front and rear shafts 15a and 15b, thereby limiting the tilting of the sensor portion 3.

[0045] Furthermore, the mechanism that enables the sensor unit 3 to move in the direction of approaching the cable 2 and away from the cable 2 is not limited to the structure consisting of the front and rear shafts 15a and 15b. Various known moving mechanisms can be used to enable the sensor unit 3 to move in the direction of approaching the cable 2 and away from the cable 2.

[0046] The shapes of the intermediate portions 16a and 16b are designed based on the structure of the moving shafts 14a and 14b, the front and rear shafts 15a and 15b. For example, the intermediate portions 16a and 16b are both U-shaped. The moving shaft 14a is configured to join the ends of the U-shaped intermediate portions 16a together. Similarly, the moving shaft 14b is configured to join the ends of the U-shaped intermediate portions 16b together. Furthermore, a hole is provided in the center of the U-shaped intermediate portion 16a for the front and rear shafts 15a to pass through. A hole is also provided in the center of the U-shaped intermediate portion 16b for the front and rear shafts 15b to pass through. For example, the intermediate portions 16a and 16b are both formed in a linearly symmetrical shape.

[0047] The base portion 17a, which supports one end of the front and rear axles 15a and one end of the front and rear axles 15b, has a connecting portion 20. The connecting portion 20 is used to connect the bearing portion 19a. The base portion 17a is fixed to a certain structure, which serves to fix the overall position of the cable flaw detection device 1a. For example, if the cable 2 is an elevator cable, the certain structure is equivalent to a beam or the like located near the cable 2.

[0048] One end of spring 18a contacts the base portion 17a. The opposite end of spring 18a contacts the middle portion 16a. Similarly, one end of spring 18b contacts the base portion 17a. The opposite end of spring 18b contacts the middle portion 16b. Springs 18a and 18b function to press the sensor portion 3 against the cable 2 via the middle portions 16a and 16b. Furthermore, springs 18a and 18b can be configured coaxially with the front and rear shafts 15a and 15b as shown in the example, or they can be configured in a location different from the front and rear shafts 15a and 15b.

[0049] The bearing surface 19a, connected to the connecting portion 20 of the base portion 17a, serves to withstand the pressing force of the springs 18a and 18b. The bearing surface 19a is configured to contact all the arranged cables 2. The shape of the bearing surface 19a can be formed as a planar shape that contacts all the cables 2, or it can be formed, for example, as having a U-shaped cut that matches the diameter of the cable 2. In the latter case, the bearing surface 19a contacts the surface of the cable 2.

[0050] The connection point between the bearing surface 19a and the connecting portion 20 is located outside the movement range of the sensor portion 3. The bearing surface 19a is configured to be easily attached and detached relative to the base portion 17a. For example, the connecting portion 20 of the base portion 17a and the bearing surface 19a are fixed with screws. Here, if the screws used to fix the bearing surface 19a are wing bolts or clamps, the bearing surface 19a can be attached and detached without the use of tools. In this example, the operability when using the cable flaw detection device 1a can be further improved.

[0051] Furthermore, to ensure flaw detection accuracy, the reproducibility of the position of the bearing face 19a when it is mounted on the base portion 17a becomes important. Therefore, for example, a positioning pin 21 can be provided in the connecting portion 20, and a hole corresponding to the positioning pin 21 can be provided on the bearing face 19a side. The positioning pin 21 and the hole can ensure the reproducibility of the position of the bearing face 19a. In addition, even if the positioning pin 21 is provided on the bearing face 19a side and the hole is provided on the connecting portion 20 side, the reproducibility of the position of the bearing face 19a can still be ensured.

[0052] In the cable flaw detection device 1a configured as shown above, the cable 2 can be clamped by the sensor unit 3 and the bearing surface 19a. This reduces the impact of cable 2 vibration and maintains the relative positional relationship between the sensor unit 3 and the cable 2. Furthermore, by clamping the cable 2 by the sensor unit 3 and the bearing surface 19a, the possibility of the cable 2 kinking and escaping can be suppressed. In the cable flaw detection device 1a of this embodiment, the effect of improved flaw detection accuracy can be achieved. Furthermore, the connection point between the bearing surface 19a and the base 17a is outside the range where the sensor unit 3 can move along the moving shafts 14a and 14b. Moreover, the sensor unit 3 is configured to be movable relative to the bearing surface 19a. Therefore, flaw detection can be performed on all arranged cables 2 without removing the bearing surface 19a. According to this embodiment, a cable flaw detection device 1a that can perform flaw detection on arranged cables with high accuracy in a shorter operation time can be obtained.

[0053] Furthermore, the cable flaw detection device 1a of this embodiment only needs to have at least one magnetic sensor 6. The cable flaw detection device 1a does not require multiple magnetic sensors 6. Therefore, it is possible to avoid increasing the cost and overall weight of the cable flaw detection device 1a.

[0054] Furthermore, the cable flaw detection device 1a of this embodiment can press the sensor unit 3 against the cable 2 using springs 18a and 18b. Therefore, for example, even if the cable 2 vibrates due to a small magnetic force acting between the sensor unit 3 and the cable 2, the sensor unit 3 will follow the movement of the cable 2 due to the pressing force from springs 18a and 18b. In this embodiment, the relative positional relationship between the cable 2 and the sensor unit 3 can be maintained more reliably using springs 18a and 18b. As a result, the flaw detection accuracy can be improved. In addition, as a mechanism for pressing the sensor unit 3 into the cable 2 along the front and rear shafts 15a and 15b, a cylinder or an electric shaft may be provided instead of springs 18a and 18b.

[0055] Next, referring to the flowchart, the flaw detection method of cable 2 using cable flaw detection device 1a will be explained. Figure 6 This is a flowchart illustrating the flaw detection method for cable 2 according to Embodiment 1.

[0056] When performing flaw detection on cable 2, firstly, the cable flaw detection device 1a is installed relative to cable 2 (step S1), and the cable 2 is measured (step S2). Then, while cable 2 is still being measured (step S3), the pressing is released (step S4), the sensor unit is moved (step S5), and pressing is performed (step S6), and then the next measurement of cable 2 is performed (step S2). The above steps are repeated until the measurement of all cables 2 is completed (step S3), and then the cables are disassembled (step S7).

[0057] In step S1, during "installation," firstly, the mounting part 5, with the sensor unit 3 and the bearing face 19a removed, is installed onto the structure. Then, the sensor unit 3 is positioned so that it contacts the cable 2 before installation. Finally, the bearing face 19a is installed relative to the base part 17a of the mounting part 5.

[0058] Step S2, "measurement," refers to performing flaw detection by moving the cable 2 relative to the cable flaw detection device 1a. If the entire measurement range of the cable 2 passes through the cable flaw detection device 1a, the flaw detection is complete. Alternatively, the cable 2 can be moved in the opposite direction to allow it to reciprocate, or it can be moved multiple times in the same direction, thereby causing the measurement range to pass through the cable flaw detection device 1a multiple times. This improves the accuracy of the flaw detection.

[0059] The first "installation" and "measurement" correspond to the first step included in the cable flaw detection method of this disclosure. The first step is to clamp the first cable 2 between the sensor part 3 and the bearing part 19a and measure the first cable 2 using the cable flaw detection device 1a.

[0060] Step S4, "release pressing," refers to disengaging the sensor unit 3 from the cable 2. Specifically, by compressing springs 18a and 18b, the sensor unit 3, moving shafts 14a and 14b, intermediate section 16a, and intermediate section 16b are moved along the front and rear shafts 15a and 15b towards the base section 17a. At this time, each component needs to be moved to a position where the sensor unit 3 can move along the moving shafts 14a and 14b.

[0061] Step S5, "sensor unit movement," refers to moving the sensor unit 3 along the moving shafts 14a and 14b, aligning the position of the sensor unit 3 with the position of the cable 2 to be measured next. "Sensor unit movement" corresponds to the second step included in the cable flaw detection method of this disclosure. The second step is performed after the first step. The second step involves moving the sensor unit 3 relative to the bearing surface 19a in the cable 2 arrangement direction to move the sensor unit 3 to the position of the second cable 2.

[0062] The "pressing" in step S6 refers to bringing the sensor unit 3, which has been moved by the "sensor unit movement" in step S5, into contact with the cable 2 to be measured next. The "pressing" is performed by releasing the compressed springs 18a and 18b.

[0063] The "pressing" and the subsequent "measurement" constitute the third step in the cable flaw detection method of this disclosure. The third step is performed after the second step. The third step is the step of clamping the second cable 2 between the sensor part 3 and the bearing surface 19a and measuring the second cable 2 using the cable flaw detection device 1a.

[0064] In the final step S7, “disassembly”, first, the bearing face 19a is removed. Then, the components other than the bearing face 19a are removed from the structure.

[0065] According to the flaw detection steps shown in this embodiment, all of the multiple cables 2 arranged together can be measured without disassembling the bearing face 19a midway.

[0066] also, Figure 7 This is a perspective view of the cable flaw detection device 1b, showing a first modification of Embodiment 1. In this first modification, the configurations of the moving shaft, front and rear shafts, and springs in the above embodiment are interchanged.

[0067] Specifically, such as Figure 7 As shown, the cable flaw detection device 1b includes a moving shaft 14c, a moving shaft 14d, front and rear shafts 15c and 15d, an intermediate section 16c and 16d, and a base section 17b. The front and rear shafts 15c and 15d pass through holes provided in the sensor section 3. One end of the front and rear shafts 15c is mounted in the intermediate section 16c, and one end of the front and rear shafts 15d is mounted in the intermediate section 16d. Holes are provided in the intermediate sections 16c and 16d respectively. The moving shaft 14c passes through the hole in the intermediate section 16c, and the moving shaft 14d passes through the hole in the intermediate section 16d. Both ends of the moving shafts 14c and 14d are fixed to the base section 17b. According to this modified example, compared to the intermediate sections 16a and 16b, the intermediate sections 16c and 16d can be miniaturized and made lighter. In the cable flaw detection device 1b of this modified example, workability can be further improved.

[0068] Figure 8 This is a perspective view of the cable flaw detection device 1c, showing a second modification of Embodiment 1. Figure 8 In China, regarding and Figure 1 and Figure 2 Repeating elements have had their labels omitted.

[0069] exist Figure 8 In the second modified example shown, the bearing surface 19b is composed of rotatable rollers 22a and 22b. According to this modified example, the wear caused by the cable 2 sliding on the bearing surface 19b can be reduced. According to this modified example, the mechanical life of the cable 2 and the bearing surface 19b can be extended.

[0070] Figure 9 This is a perspective view of the cable flaw detection device 1d, which is a third variation of Embodiment 1. Figure 10 This is a perspective view showing the cable flaw detection device 1d of the third modification of Embodiment 1 installed on the cable 2. Figure 9 and Figure 10 In China, regarding and Figure 1 and Figure 2 Repeating elements have had their labels omitted.

[0071] like Figure 9 and Figure 10As shown, the cable flaw detection apparatus 1d of this modified example includes comb teeth 23a and 23b as constraint members for constraining the movement of the cable 2 in the arrangement direction. Comb teeth 23a and 23b are mounted on the base portion 17a. At the front ends of comb teeth 23a and 23b, U-shaped cuts 24 are formed in a number corresponding to the number of cables 2, and these cuts 24 have a diameter set larger than the diameter of the cable 2. Comb teeth 23a and 23b are configured to continuously constrain the cable 2 within the cuts 24. According to this modified example, even if the sensor portion 3 is temporarily removed from the cable 2 when changing the cable 2 to be detected, the cable 2 can be easily grasped when the sensor portion 3 is pressed back onto the cable 2. According to this modified example, the workability when changing the cable 2 to be detected can be improved. Furthermore, the constraint members disclosed herein are not limited to comb teeth 23a and 23b with U-shaped cuts 24. The constraint components can be of any shape and structure. For example, the shape of the cutout 24 can also be a quadrilateral or a circle, etc.

[0072] Industrial availability

[0073] The cable flaw detection device and method disclosed herein can be used, for example, to detect damaged parts of cables used in elevators, lifts, and cranes.

[0074] Label Explanation

[0075] 1a: Cable flaw detection device; 1b: Cable flaw detection device; 1c: Cable flaw detection device; 1d: Cable flaw detection device; 2: Cable; 3: Sensor unit; 4: Protective cover; 5: Mounting unit; 6: Magnetic sensor; 7: Back yoke; 8a: Permanent magnet; 8b: Permanent magnet; 9a: Magnetic pole piece; 9b: Magnetic pole piece; 10: Support platform; 11: Non-magnetic component; 12: Damaged part of the cable; 13: Local leakage flux; 14a: Moving shaft; 14b: Moving shaft; 14c: Moving... 14d: Moving shaft; 15a: Front and rear shaft; 15b: Front and rear shaft; 15c: Front and rear shaft; 15d: Front and rear shaft; 16a: Middle part; 16b: Middle part; 16c: Middle part; 16d: Middle part; 17a: Base part; 17b: Base part; 18a: Spring; 18b: Spring; 19a: Bearing part; 20: Connecting part; 21: Positioning pin; 22a: Roller; 22b: Roller; 23a: Comb tooth; 23b: Comb tooth; 24: Cut.

Claims

1. A cable flaw detection device, characterized in that, The cable flaw detection device includes: The sensor unit has a magnetizer and a magnetic sensor, the magnetizer magnetizing the cable and the magnetic sensor detecting leakage magnetic flux caused by damage to the cable. A movable axis that enables the sensor unit to move in the direction of the arrangement of the plurality of cables; A guide shaft that guides the sensor unit in a direction away from the cable; as well as The face is supported, and it is positioned opposite the sensor unit via the cable. The sensor unit is pressed against the cable along the guide shaft. The movable axis enables the sensor unit to move relative to the receiving face. The bearing surface comes into contact with the multiple cables. The cable flaw detection device also includes a base, and the guide shaft is mounted on the base. The bearing surface can be attached to and detached relative to the base portion. The connection point between the bearing surface and the base is located outside the movement range of the sensor.

2. The cable flaw detection device according to claim 1, wherein, The bearing surface contacts multiple cables corresponding to the range of movement of the sensor unit via the moving axis.

3. The cable flaw detection device according to claim 1 or 2, wherein, The cable flaw detection device also includes a spring that generates a force that presses the sensor part against the cable along the guide shaft.

4. The cable flaw detection device according to claim 3, wherein, The movable axis enables the sensor unit to move relative to the spring.

5. The cable flaw detection device according to any one of claims 1 to 2 and claim 4, wherein, The bearing surface is composed of rotatable rollers.

6. The cable flaw detection device according to claim 3, wherein, The bearing surface is composed of rotatable rollers.

7. The cable flaw detection device according to any one of claims 1 to 2 and claims 4 and 6, wherein, The cable flaw detection device also includes a constraint component that constrains the movement of the cable relative to the sensor unit in the arrangement direction.

8. The cable flaw detection device according to claim 3, wherein, The cable flaw detection device also includes a constraint component that constrains the movement of the cable relative to the sensor unit in the arrangement direction.

9. The cable flaw detection device according to claim 5, wherein, The cable flaw detection device also includes a constraint component that constrains the movement of the cable relative to the sensor unit in the arrangement direction.

10. The cable flaw detection device according to claim 7, wherein, The constraint component is a comb with multiple U-shaped cuts.

11. The cable flaw detection device according to claim 8, wherein, The constraint component is a comb with multiple U-shaped cuts.

12. The cable flaw detection device according to claim 9, wherein, The constraint component is a comb with multiple U-shaped cuts.

13. A method for detecting flaws in a cable, wherein the method uses the cable flaw detection device according to any one of claims 1 to 12. The flaw detection methods for the cable include: In the first step, the first cable is clamped between the sensor part and the receiving surface to measure the first cable; The second step, after the first step, involves moving the sensor unit relative to the bearing surface in the arrangement direction of the plurality of cables, thereby moving the sensor unit to the position of the second cable; and In the third step, after the second step, the second cable is clamped between the sensor part and the bearing surface to measure the second cable.

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