Tensile body inspection device

Abstract

This tensile body inspection device (1) comprises: a magnetic sensor (30) having a detection element (31) for detecting a magnetic field, the detection element (31) facing an object (6) that includes a tensile body (61), and a detection magnet (32) for generating a magnetic field that acts on the object (6); and a demagnetizer (2) for demagnetizing the tensile body (61), the demagnetizer (2) facing the object (6) at a position that is set apart from the magnetic sensor (30) in the extension direction of the tensile body (61).

Description

Tensile body inspection device

[0001] The present disclosure relates to a tensile body testing device.

[0002] Moving handrails and other components of passenger conveyors, such as escalators, contain wire ropes as tension members. Wire ropes are typically made of stranded wires. The wires of wire ropes can break or fray due to fatigue. For this reason, an inspection device has been developed that uses a magnetic sensor to detect defects in wire ropes (see, for example, Patent Document 1).

[0003] Japanese Patent No. 7020564 (see Figure 4)

[0004] Here, the moving handrail of the passenger conveyor is endless and has a joint. At the joint of the moving handrail, both ends of the wire rope may overlap or may be separated.

[0005] The magnetic field that reaches the magnetic sensor differs depending on whether the ends of the wire rope are overlapping or separated. When the ends of the wire rope are separated, a strong magnetic field acts on the magnetic sensor in the gap between the ends, which may exceed the sensor's detectable range. While it is possible to widen the sensor's detectable range to address such cases, this would result in a decrease in inspection accuracy.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a tensile body inspection device with high detection accuracy.

[0007] The tensile body inspection device of the present disclosure comprises a magnetic sensor that faces an object including a tensile body and has a detection element that detects a magnetic field and a detection magnet that generates a magnetic field that acts on the object, and a demagnetizer that faces the object at a position spaced from the magnetic sensor in the extension direction of the tensile body and demagnetizes the tensile body.

[0008] The tensile body inspection device of the present disclosure demagnetizes the tensile body using a demagnetizer, then applies a magnetic field from a detection magnet to the tensile body and detects the change in the magnetic field using a detection element. Therefore, even if the tensile body has a gap between its ends, it is possible to prevent a strong magnetic field from reaching the magnetic sensor. As a result, it is possible to provide a tensile body inspection device with high detection accuracy.

[0009] 1 is a perspective view showing a tension body inspection device of embodiment 1. FIG. 2 is a cross-sectional view showing a tension body inspection device of embodiment 1. FIG. 3 is a schematic diagram showing the detection principle by a magnetic sensor of embodiment 1. FIG. 4 is views (A), (B), and (C) showing an example of an arrangement of tension bodies at a joint of a moving handrail of embodiment 1. FIG. 5 is views (A), (B), and (C) showing another example of an arrangement of tension bodies at a joint of a moving handrail of embodiment 1. FIG. 6 is a schematic diagram showing a magnetic field in a gap between the ends of the tension body of embodiment 1. FIG. 7 is a schematic diagram showing a magnetic field at an overlapping portion of the tension body of embodiment 1. FIG. 8 is a cross-sectional view showing a tension body inspection device of a modified example of embodiment 1. FIG. 9 is cross-sectional views (A) and (B) showing a tension body inspection device of embodiment 2. FIG. 10 is a perspective view showing a tension body inspection device of embodiment 3. FIG. 11 is a cross-sectional view showing a tension body inspection device of embodiment 3. FIG. 12 is a schematic diagram showing an example of using the tension body inspection device of embodiment 1 to inspect the wire rope of a belt rope. FIG. 13 is a perspective view showing an example of using the tension body inspection device of embodiment 1 to inspect the carcass of a tire. FIG. 1 is a cross-sectional view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire carcass. FIG. 2 is a perspective view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 3 is a cross-sectional view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 4 is a cross-sectional view showing another example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 5 is a cross-sectional view showing another example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 6 is a perspective view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect reinforcing bars in a concrete structure.

[0010] Hereinafter, a tension body inspection device according to an embodiment will be described with reference to the drawings. The following embodiments are merely examples, and the embodiments may be modified as appropriate, or the embodiments may be combined as appropriate.

[0011] Embodiment 1. <Configuration of tensile body inspection device 1> Fig. 1 is a perspective view showing a tensile body inspection device 1 of embodiment 1. Fig. 2 is a cross-sectional view showing the tensile body inspection device 1 of embodiment 1. As shown in Fig. 1, the tensile body inspection device 1 is installed above a moving handrail 6. The moving handrail 6 is provided on a passenger conveyor. The passenger conveyor is, for example, an escalator, a moving walkway, or the like.

[0012] The moving handrail 6 includes a base body 62 made of resin and a wire rope 61 serving as a tension member provided inside the base body 62. The wire rope 61 is made of a magnetic material.

[0013] The base 62 is made of a resin such as rubber or polyurethane. The base 62 is endless. That is, the base 62 is an elongated resin member with both longitudinal ends joined together. In addition, the base 62 has, in a cross section perpendicular to its extension direction, a flat portion 62a and U-shaped curved portions 62b on both sides in the width direction.

[0014] The wire rope 61 is made by twisting together strands of metal wire such as carbon steel. A plurality of wire ropes 61 are arranged side by side in the width direction inside the flat portion 62a of the base body 62. Like the base body 62, the wire rope 61 is endless.

[0015] In the following, the width direction of the moving handrail 6 is referred to as the X direction, and the extension direction of the moving handrail 6 is referred to as the Y direction. The direction perpendicular to both the X direction and the Y direction is referred to as the Z direction. Here, the Z direction is the up-down direction. In Figure 1 etc., the Y direction is a linear direction, but it may also be, for example, a circumferential direction.

[0016] The tensile body inspection device 1 is disposed so as to face the flat portion 62a of the moving handrail 6. The tensile body inspection device 1 has a demagnetizer / magnetizer 2 and a sensor unit 3. The demagnetizer / magnetizer 2 and the sensor unit 3 are disposed at a distance in the Y direction. The demagnetizer / magnetizer 2 and the sensor unit 3 are also formed to be long in the direction crossing the moving handrail 6, i.e., in the X direction.

[0017] The demagnetizer / magnetizer 2 is an integrated device consisting of a demagnetizer and a magnetizer. When the demagnetizer / magnetizer 2 demagnetizes the wire rope 61, the demagnetizer / magnetizer 2 can be referred to as a "demagnetizer." When the demagnetizer / magnetizer 2 magnetizes the wire rope 61, the demagnetizer / magnetizer 2 can be referred to as a "magnetizer."

[0018] 2, the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the moving handrail 6 in the extension direction of the moving handrail 6. Here, the direction of relative movement of the demagnetizer / magnetizer 2 and the sensor unit 3 with respect to the moving handrail 6 is defined as the +Y direction.

[0019] Specifically, the demagnetizer / magnetizer 2 and the sensor unit 3 may be moved in the +Y direction by the driving force of a dedicated motor, or the positions of the demagnetizer / magnetizer 2 and the sensor unit 3 may be fixed and the moving handrail 6 may be moved in the -Y direction.

[0020] If the positions of the demagnetizer / magnetizer 2 and the sensor unit 3 are fixed and the moving handrail 6 is moved in the -Y direction, the existing drive source of the escalator or moving walkway can be used, so there is no need to provide a dedicated motor.

[0021] The demagnetizer / magnetizer 2 is disposed forward in the direction of relative movement of the demagnetizer / magnetizer 2 and the sensor unit 3 with respect to the moving handrail 6, that is, in the +Y direction.

[0022] The demagnetizer / magnetizer 2 faces the moving handrail 6, which is an object, at a position spaced apart from the magnetic sensor 30 in the direction in which the wire rope 61, which is a tension body, extends, and demagnetizes the wire rope 61, which is a tension body. The demagnetizer / magnetizer 2 also faces the moving handrail 6, which is an object, at a position spaced apart from the magnetic sensor 30 in the direction in which the wire rope 61, which is a tension body, extends, and magnetizes the wire rope 61, which is a tension body.

[0023] The sensor unit 3 has a magnetic sensor 30, a signal processing circuit 33, and a housing 35 that houses these components. The housing 35 forms the outer shell of the sensor unit 3. A pair of rollers 36 that come into contact with the moving handrail 6 is provided on both ends of the housing 35 in the Y direction.

[0024] The magnetic sensor 30 has a detection element 31 arranged to face the moving handrail 6, and a detection magnet 32 ​​arranged on the opposite side of the detection element 31 from the moving handrail 6 (here, in the +Z direction). The detection element 31 faces the moving handrail 6, which is an object that includes a wire rope 61 as a tension member, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field (a detection magnetic field F, described below) that acts on the moving handrail 6, which is an object. The roller 36 maintains a constant distance between the magnetic sensor 30 and the moving handrail 6.

[0025] 1, the detection element 31 and detection magnet 32 ​​of the magnetic sensor 30 extend in the direction across the moving handrail 6, i.e., in the X direction. It is desirable that the length of the detection element 31 and detection magnet 32 ​​in the X direction be equal to or greater than the width of the flat portion 62a of the moving handrail 6.

[0026] The detection element 31 is composed of a magnetic detection element, a magnetic impedance element, or a pickup coil. Examples of the magnetic detection element include an anisotropic magnetoresistance (AMR) element, a giant magnetoresistance (GMR) element, and a tunnel magnetoresistance (TMR) element. The detection element 31 detects changes in a magnetic field.

[0027] The detection magnet 32 ​​is composed of, for example, a permanent magnet. The detection magnet 32 ​​has a north pole on the moving handrail 6 side and a south pole on the opposite side. The detection element 31 is located between the detection magnet 32 ​​and the moving handrail 6. The detection magnet 32 ​​may also be an electromagnet.

[0028] The signal processing circuit 33 is connected to the detection element 31 via a cable 34 (FIG. 1) and is also connected to the control device 15 via lead wires 14. The signal processing circuit 33 receives an output signal from the detection element 31 and transmits it to the control device 15. Note that the signal processing circuit 33 does not necessarily have to be mounted on the sensor unit 3, as long as it is disposed in a position where it can detect the output signal from the detection element 31.

[0029] The control device 15 is a computer or the like provided outside the tensile body inspection device 1. The control device 15 includes a CPU (Central Processing Unit), a storage device such as a memory, a display unit that displays information, and an input unit through which the user inputs information. The control device 15 can be placed in a position separate from the demagnetizer / magnetizer 2 and the sensor unit 3.

[0030] The demagnetizer / magnetizer 2 has a magnetic body 21, a coil 22 wound around the magnetic body 21, a power supply 23 connected to the coil 22, and a housing 25 that houses these components. The housing 25 forms the outer shell of the demagnetizer / magnetizer 2. A pair of rollers 26 that come into contact with the moving handrail 6 is provided on both ends of the housing 25 in the Y direction.

[0031] It should be noted that the distance between the demagnetizer / magnetizer 2 and the moving handrail 6 does not need to be controlled with as high precision as the distance between the magnetic sensor 30 and the moving handrail 6, and therefore the demagnetizer / magnetizer 2 does not necessarily have to have the roller 26. In other words, it is sufficient that the demagnetizer / magnetizer 2 is held so as to be movable relative to the moving handrail 6.

[0032] The magnetic body 21 has a first magnetic pole portion 21a and a second magnetic pole portion 21b that face each other in the Y direction, and a yoke portion 21c that connects the first magnetic pole portion 21a and the second magnetic pole portion 21b. The first magnetic pole portion 21a is located in the +Y direction, and the second magnetic pole portion 21b is located in the −Y direction.

[0033] The magnetic material 21 extends in the direction across the moving handrail 6, i.e., in the X direction. It is desirable that the length of the magnetic material 21 in the X direction be equal to or greater than the width of the flat portion 62a of the moving handrail 6 (FIG. 1).

[0034] 2, the coil 22 is wound around the yoke portion 21c of the magnetic body 21, with the winding axis direction being the Y direction. The power supply 23 passes a direct current or an alternating current through the coil 22. The current flowing through the coil 22 generates a magnetic field in the magnetic body 21. The polarity of the first magnetic pole portion 21a and the second magnetic pole portion 21b is switched depending on the direction of the current supplied from the power supply 23 to the coil 22.

[0035] When a DC current flows through the coil 22, a DC magnetic field is generated between the first magnetic pole portion 21a and the second magnetic pole portion 21b, and the wire rope 61 of the moving handrail 6 is magnetized. Magnetizing the wire rope 61 means increasing the magnetization within the wire rope 61.

[0036] When an AC current flows through the coil 22, an AC magnetic field is generated between the first magnetic pole portion 21a and the second magnetic pole portion 21b, and the wire rope 61 of the moving handrail 6 is demagnetized. Demagnetizing the wire rope 61 means reducing the magnetization within the wire rope 61.

[0037] The power supply 23 is connected to the control device 15 by a lead wire (not shown) and is controlled by the control device 15. Alternatively, the power supply 23 may be controlled by a control unit separate from the control device 15.

[0038] 3 is a schematic diagram showing the principle of detecting defects in the wire rope 61 by the magnetic sensor 30. The detection magnet 32 ​​is arranged with its north pole 32a facing the moving handrail 6 and its south pole 32b facing the opposite side. The detection element 31 is arranged between the north pole 32a of the detection magnet 32 ​​and the moving handrail 6.

[0039] The magnetic flux emitted from the north pole 32a of the detection magnet 32 ​​returns to the south pole 32b of the detection magnet 32. In other words, the detection magnet 32 ​​generates a detection magnetic field F. The detection element 31 and the moving handrail 6 are located in this detection magnetic field F.

[0040] When the wire rope 61 is magnetized by the demagnetizer / magnetizer 2 (Figure 2), the remaining magnetized part of the wire rope 61 faces the detection element 31 of the magnetic sensor 30 due to the relative movement of the demagnetizer / magnetizer 2 and the sensor unit 3 in the +Y direction with respect to the moving handrail 6.

[0041] The detection element 31 of the magnetic sensor 30 detects a composite magnetic field that is a combination of the detection magnetic field F generated by the detection magnet 32 ​​and the magnetic field generated by residual magnetization within the wire rope 61. Therefore, if there is no defect in the wire rope 61 of the moving handrail 6, the detection element 31 always detects a constant magnetic field.

[0042] A defect in the wire rope 61 is, for example, fraying of the wires 61c of the wire rope 61. When the wires 61c of the wire rope 61 of the moving handrail 6 break and fray, causing the wires 61c to protrude onto the surface of the moving handrail 6, a change occurs in the detection magnetic field F acting on the detection element 31, and the detection element 31 detects this change.

[0043] When the detection element 31 detects a change in the magnetic field, the signal processing circuit 33 connected to the detection element 31 outputs a defect detection signal to the control device 15. Based on the defect detection signal from the signal processing circuit 33, the control device 15 displays a message or the like on the display unit indicating that a defect in the wire rope 61 has been detected.

[0044] <Regarding the joints of the moving handrail 6> Next, we will explain the joints of the moving handrail 6. Figures 4(A) to 4(C) and Figures 5(A) to 5(C) are schematic diagrams showing examples of the arrangement of wire ropes 61 at the joints of the moving handrail 6.

[0045] As described above, the moving handrail 6 is endless and has a joint. At the joint of the moving handrail 6, one end (referred to as the first end) 61a and the other end (referred to as the second end) 61b of the wire rope 61 may be spaced apart in the Y direction or may overlap each other.

[0046] 4A to 4C, the first end 61a and the second end 61b of the wire rope 61 are spaced apart in the Y direction. The gap between the first end 61a and the second end 61b of the wire rope 61 is referred to as an end-to-end gap 64.

[0047] In the example shown in Figure 4(A), the Y-direction positions of the gaps 64 between the ends of the multiple wire ropes 61 of the moving handrail 6 are the same. On the other hand, in the examples shown in Figures 4(B) and 4(C), the Y-direction positions of the gaps 64 between the ends of the multiple wire ropes 61 of the moving handrail 6 differ depending on the X-direction position of the wire ropes 61.

[0048] Specifically, in Fig. 4(B), the gap 64 between the ends of the wire rope 61 that is located closer to the +X direction is located in the -Y direction. Also, in Fig. 4(C), the gap 64 between the ends of the wire rope 61 that is closer to the center of the X direction of the moving handrail 6 is located in the -Y direction.

[0049] When the first end 61a and the second end 61b of the wire rope 61 are spaced apart in the Y direction as shown in Figures 4(A) to (C), the Y direction distance between these ends 61a, 61b (i.e., the end-to-end gap 64) is referred to as the negative overlap distance A.

[0050] 5A to 5C, the portion including the first end 61a of the wire rope 61 overlaps with the portion including the second end 61b. The overlapping portion of the portion including the first end 61a of the wire rope 61 and the portion including the second end 61b is referred to as an overlap portion 65.

[0051] In Fig. 5(A), the Y-direction positions of the overlapping portions 65 of the multiple wire ropes 61 of the moving handrail 6 are the same. On the other hand, in Fig. 5(B) and Fig. 5(C), the Y-direction positions of the overlapping portions 65 of the multiple wire ropes 61 of the moving handrail 6 differ depending on the X-direction positions of the wire ropes 61.

[0052] Specifically, in Fig. 5(B), the overlapping portion 65 of the wire rope 61 that is located closer to the +X direction is located in the -Y direction. Also, in Fig. 5(C), the overlapping portion 65 of the wire rope 61 that is closer to the center of the moving handrail 6 in the X direction is located in the -Y direction.

[0053] As shown in Figures 5(A) to (C), when the portion including the first end 61a of the wire rope 61 overlaps with the portion including the second end 61b, the Y-direction length of these overlapping portions (i.e., overlap portion 65) is referred to as the positive overlap distance A.

[0054] The magnetic field that reaches the detection element 31 of the magnetic sensor 30 differs when the overlap distance A of the wire rope 61 is negative (FIGS. 4A to 4C) and when the overlap distance A is positive (FIGS. 5A to 5C). This will be explained below.

[0055] 6 is a diagram showing the magnetic field inside the wire rope 61 when the overlap distance A of the wire rope 61 is negative. As described with reference to FIG. 3, when the wire rope 61 is magnetized by the demagnetizer / magnetizer 2 (FIG. 2), residual magnetization inside the wire rope 61 generates a magnetic field in the Y direction (here, the −Y direction).

[0056] Because there is no conductor in the end-to-end gap 64 of the wire rope 61, a magnetic field spreads around it as shown by arrow C1. In other words, a strong magnetic field is generated around the end-to-end gap 64. When the magnetic sensor 30 reaches a position facing the end-to-end gap 64, the magnetic field generated in the end-to-end gap 64 reaches the detection element 31 ( FIG. 3 ) of the magnetic sensor 30, and the magnetic field detected by the detection element 31 increases.

[0057] Therefore, the detection element 31 needs to have a wide detectable range (also called a dynamic range) so that it can detect such magnetic fields. However, widening the detectable range of the detection element 31 reduces the detection accuracy.

[0058] 7 is a diagram showing the magnetic field in the wire rope 61 when the overlap distance A of the wire rope 61 is positive. As in FIG. 6, residual magnetization in the wire rope 61 generates a magnetic field in the Y direction (here, the −Y direction).

[0059] In this case, since the conductors of the wire rope 61 are in contact with each other at the overlapping portion 65, the magnetic field does not spread to the surrounding area but moves from one end of the wire rope 61 to the other end, as shown by arrow C2. Therefore, there is no significant change in the magnetic field acting on the detection element 31 of the magnetic sensor 30.

[0060] Therefore, when the moving handrail 6 is used in which the overlap distance A of the wire rope 61 is negative, that is, when the wire rope 61, which is a tension body, has a gap in the extension direction, the tension body inspection device 1 of the first embodiment demagnetizes the wire rope 61 using the demagnetizer / magnetizer 2. The operating mode of the tension body inspection device 1 in this case is referred to as the first operating mode (or demagnetization mode). In other words, the first operating mode is an operating mode in which the wire rope 61, which is a tension body, is demagnetized by the demagnetizer.

[0061] In the first operating mode, an AC current is applied from the power supply 23 of the demagnetizer / magnetizer 2 to the coil 22, generating an AC magnetic field between the first magnetic pole portion 21a and the second magnetic pole portion 21b of the magnetic body 21. In other words, an AC magnetic field is applied from the demagnetizer to the wire rope 61, which is a tensile body. As a result, the portion of the wire rope 61 facing the demagnetizer / magnetizer 2 is demagnetized, and the magnetization of that portion is reduced.

[0062] When the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the wire rope 61 in the +Y direction and the demagnetized portion of the wire rope 61 faces the magnetic sensor 30, the detection magnetic field F of the detection magnet 32 ​​acts on that portion.

[0063] If there is a fray in the wire 61c of the wire rope 61, the detection element 31 of the magnetic sensor 30 can detect this by a change in the detection magnetic field F. Because the wire rope 61 is demagnetized before detection by the magnetic sensor 30, even if the magnetic field spreads to the surrounding area in the end-to-end gap 64 as shown in Figure 6, the magnetic field that reaches the detection element 31 is weaker.

[0064] In the first operating mode, the wire rope 61 is demagnetized by the demagnetizer / magnetizer 2, so the magnetic field caused by residual magnetization in the wire rope 61 is very small, but fraying of the wires 61c of the wire rope 61 can be detected using only the detection magnetic field F from the detection magnet 32.

[0065] On the other hand, when a moving handrail 6 is used in which the overlap distance A of the wire rope 61 is positive, that is, when the wire rope 61, which is a tension body, has an overlap portion in the extension direction, no large magnetic field change acts on the detection element 31. Therefore, the tension body inspection device 1 magnetizes the wire rope 61 using the demagnetizer / magnetizer 2. The operating mode of the tension body inspection device 1 in this case is referred to as the second operating mode (or magnetization mode). In other words, the second operating mode is an operating mode in which the wire rope 61, which is a tension body, is magnetized using the magnetizer.

[0066] In the second operation mode, a DC current is passed from the power supply 23 of the demagnetizer / magnetizer 2 to the coil 22, generating a DC magnetic field between the first magnetic pole portion 21a and the second magnetic pole portion 21b of the magnetic body 21. In other words, a DC magnetic field is applied from the magnetizer to the wire rope 61, which is a tension body. This aligns the magnetization direction in the wire rope 61 in one direction before detection by the magnetic sensor 30.

[0067] When the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the wire rope 61 in the +Y direction and the magnetized portion of the wire rope 61 faces the magnetic sensor 30, the detection magnetic field F of the detection magnet 32 ​​acts on that portion.

[0068] If there is a fray in the wire 61c of the wire rope 61, the detection element 31 of the magnetic sensor 30 can detect this by a change in the composite magnetic field of the magnetic field due to residual magnetization in the wire rope 61 and the detection magnetic field F. Because the detection element 31 detects the composite magnetic field, it can detect fraying in the wire 61c of the wire rope 61 with greater accuracy.

[0069] The first and second operating modes of the tension member inspection device 1 are controlled by the control device 15 according to the type of wire rope 61. That is, the control device 15 selects the first operating mode when the wire rope 61 has a negative overlap distance A, and selects the second operating mode when the wire rope 61 has a positive overlap distance A.

[0070] A user of the tension member inspection device 1 is, for example, a worker performing maintenance and inspection of a passenger conveyor. Whether the overlap distance A of the wire rope 61 is positive or negative depends on the type of moving handrail 6. Therefore, the user may input the positive or negative value of the overlap distance A into the input section of the control device 15. Alternatively, the control device 15 may automatically determine this.

[0071] Here, the demagnetizer / magnetizer 2 magnetizes and demagnetizes the wire rope 61, but a magnetizer and a demagnetizer may also be provided.

[0072] <Effects of First Embodiment> As described above, the tension member inspection device 1 of the first embodiment faces the moving handrail 6 (i.e., an object) including the wire rope 61 (i.e., a tension member), and is equipped with the magnetic sensor 30 having the detection element 31 that detects changes in the magnetic field and the detection magnet 32 ​​that generates a magnetic field that acts on the moving handrail 6, and the demagnetizer / magnetizer 2 that faces the moving handrail 6 at a position spaced from the magnetic sensor 30 in the extension direction of the wire rope 61, and magnetizes or demagnetizes the wire rope 61.

[0073] Therefore, when the overlap distance A of the wire rope 61 of the moving handrail 6 is negative, the wire rope 61 can be demagnetized by the demagnetizer / magnetizer 2 (first operation mode). This prevents a strong magnetic field from acting on the detection element 31 of the magnetic sensor 30. As a result, it is no longer necessary to widen the detectable range of the detection element 31, and detection accuracy can be improved.

[0074] Furthermore, when the overlap distance A of the wire rope 61 of the moving handrail 6 is positive, the wire rope 61 can be magnetized by the demagnetizer / magnetizer 2 (second operation mode). This allows the detection element 31 of the magnetic sensor 30 to detect a composite magnetic field of the magnetic field due to the magnetization in the wire rope 61 and the detection magnetic field F from the detection magnet 32, thereby improving detection accuracy.

[0075] Furthermore, when the moving handrail 6 is in use, the wire rope 61 may be unevenly magnetized by the magnetic force of magnets or the like carried by passengers, but this effect can be suppressed by magnetizing or demagnetizing the inside of the wire rope 61 using the demagnetizer / magnetizer 2.

[0076] In addition, in the first operating mode, an AC magnetic field is applied to the wire rope 61 from the demagnetizer / magnetizer 2, and in the second operating mode, a DC magnetic field is applied to the wire rope 61 from the demagnetizer / magnetizer 2, so that the wire rope 61 can be efficiently demagnetized and magnetized.

[0077] Furthermore, since the magnetic body 21 has a first magnetic pole portion 21a and a second magnetic pole portion 21b that face each other in the extension direction of the wire rope 61 (i.e., the Y direction), a magnetic field is generated between the magnetic pole portions 21a and 21b, and the wire rope 61 can be magnetized efficiently.

[0078] In addition, since it further includes a signal processing circuit 33 that processes the output of the detection element 31, a detection signal for fraying of the wire 61c of the wire rope 61 can be output to the control device 15 in accordance with changes in the magnetic field detected by the detection element 31.

[0079] 8 is a cross-sectional view showing a tensile material inspection apparatus 1A according to a modification of the first embodiment. The tensile material inspection apparatus 1A according to the modification differs from the tensile material inspection apparatus 1 according to the first embodiment in the configuration of the magnetic body 24 of the demagnetizer / magnetizer 2A.

[0080] The magnetic body 24 has a first magnetic pole portion 24a facing the moving handrail 6 and a second magnetic pole portion 24b facing the opposite side. The coil 22 is wound around the magnetic body 24, and the direction of the winding axis is the Z direction.

[0081] When a current flows through the coil 22, a magnetic field is generated between the first magnetic pole portion 24a and the second magnetic pole portion 24b, and the wire rope 61 of the moving handrail 6 is positioned in this magnetic field. When a direct current flows through the coil 22, a direct current magnetic field is generated between the magnetic pole portions 24a and 24b, and the wire rope 61 of the moving handrail 6 can be magnetized. When an alternating current flows through the coil 22, an alternating current magnetic field is generated between the magnetic pole portions 24a and 24b, and the wire rope 61 of the moving handrail 6 can be demagnetized.

[0082] In the modified tensile material inspection device 1A, the magnetic body 24 has a simple configuration, which allows for a reduction in manufacturing costs.

[0083] Embodiment 2. Fig. 9(A) is a cross-sectional view showing a tensile body inspection device 1B of embodiment 2. In embodiment 2, a magnetizer 2B (Fig. 9(B)) and a demagnetizer 2C (Fig. 9(A)) are provided instead of the demagnetizer / magnetizer 2 of embodiment 1. The magnetizer 2B and the demagnetizer 2C are configured separately.

[0084] 9A, the demagnetizer 2C has a magnetic body 21, a coil 22, a power supply 23, and a housing 25. The magnetic body 21, the coil 22, the power supply 23, and the housing 25 are configured in the same manner as the magnetic body 21, the coil 22, the power supply 23, and the housing 25 of the first embodiment. However, it is sufficient that the power supply 23 supplies only an AC current for demagnetization to the coil 22. Note that the housing 25 may be provided with a roller similar to the roller 26 shown in FIG. 2.

[0085] 9(B), the magnetizer 2B has a permanent magnet 27 and a housing 28. The permanent magnet 27 has a first magnetic pole portion 27a and a second magnetic pole portion 27b that face each other in the Y direction, and a yoke portion 27c that connects the first magnetic pole portion 27a and the second magnetic pole portion 27b. The first magnetic pole portion 27a is located in the +Y direction, and the second magnetic pole portion 27b is located in the -Y direction.

[0086] In this example, the first magnetic pole portion 27a of the permanent magnet 27 is the north pole and the second magnetic pole portion 27b is the south pole, but the polarities may be reversed. The wire rope 61 of the moving handrail 6 is magnetized by the magnetic field between the first magnetic pole portion 27a and the second magnetic pole portion 27b of the permanent magnet 27.

[0087] The housing 28 is the outer shell of the magnetizer 2B, and houses the permanent magnet 27 inside. The housing 28 may be provided with a roller similar to the roller 26 shown in FIG.

[0088] In the second embodiment, the magnetizer 2B and the demagnetizer 2C are provided separately, and therefore the user can select either the magnetizer 2B or the demagnetizer 2C depending on the type of moving handrail 6 to be inspected, and use it in combination with the sensor unit 3.

[0089] 9A, when the overlap distance A of the wire rope 61 is negative, the demagnetizer 2C and the sensor unit 3 constitute the tensile material inspection device 1B. In this case, the tensile material inspection device 1B executes the first operation mode. That is, the demagnetizer 2C applies an AC current to the coil 22, and the magnetic body 21 applies an AC magnetic field to the wire rope 61, thereby demagnetizing the wire rope 61. The sensor unit 3 performs detection using the detection element 31, utilizing the detection magnetic field of the detection magnet 32.

[0090] 9(B), when the overlap distance A of the wire rope 61 is positive, the magnetizer 2B and the sensor unit 3 constitute the tensile material inspection device 1B. In this case, the tensile material inspection device 1B executes the second operating mode. The demagnetizer 2C magnetizes the wire rope 61 with the magnetic field of the permanent magnet 27. The sensor unit 3 detects magnetic field changes with the detection element 31, utilizing a composite magnetic field of the detection magnetic field of the detection magnet 32 ​​and the magnetic field due to residual magnetization in the wire rope 61.

[0091] For example, in a case where only a wire rope 61 having a negative overlap distance A is used, it is possible to use only the tension body inspection device 1B having the demagnetizer 2C and the sensor unit 3 as shown in Fig. 9(A), thereby reducing the cost required for inspection.

[0092] Except for the points described above, the tensile body inspection apparatus 1B of the second embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0093] As described above, in the second embodiment, the magnetizer 2B and the demagnetizer 2C are provided separately, and therefore one of the magnetizer 2B and the demagnetizer 2C can be selected depending on the type of moving handrail 6 to be inspected, and can be used in combination with the sensor unit 3 as the tensile body inspection device 1B.

[0094] Embodiment 3. Fig. 10 is a perspective view showing a tensile body inspection apparatus 1C of embodiment 3. Fig. 11 is a cross-sectional view showing a tensile body inspection apparatus 1C of embodiment 3. In the tensile body inspection apparatus 1C of embodiment 3, the demagnetizer / magnetizer 20 and the magnetic sensor 30 are housed in a common housing 50 and form a single unit.

[0095] The housing 50 is the outer shell of the tensile body inspection device 1C, and houses inside it the demagnetizer / magnetizer 20, the magnetic sensor 30, and the signal processing circuit 33. A roller 51 similar to the roller 36 of the first embodiment is provided on the moving handrail 6 side of the housing 50.

[0096] The demagnetizer / magnetizer 20 has the same configuration as the demagnetizer / magnetizer 20 of the first embodiment, but does not need to have the housing 25 ( FIG. 2 ) because it is surrounded by the housing 50. The magnetic sensor 30 has the same configuration as the magnetic sensor 30 of the first embodiment.

[0097] In the third embodiment, the demagnetizer / magnetizer 20, the magnetic sensor 30, the signal processing circuit 33, and the housing 50 that houses them constitute the tension body inspection unit 5. Since both the demagnetizer / magnetizer 20 and the magnetic sensor 30 are mounted on the tension body inspection unit 5, the tension body inspection unit 5 can be moved relative to the moving handrail 6 in the +Y direction during inspection.

[0098] Except for the points described above, the tensile body inspection apparatus 1C of the third embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0099] As described above, in the third embodiment, the demagnetizer / magnetizer 20 and the magnetic sensor 30 are housed in a common housing 50 and configured as a single tensile body inspection unit 5, which simplifies handling of the tensile body inspection device 1C during inspection.

[0100] In the first to third embodiments, the case where the tensile member to be inspected is the wire rope 61 of the moving handrail 6 of a passenger conveyor has been described, but as will be described below, inspection of other tensile members is also possible. In the following, inspection of various tensile members using the tensile member inspection device 1 of the first embodiment will be described.

[0101] 12 is a perspective view showing a method for inspecting the belt rope 71 of the power transmission belt 7. The power transmission belt 7 is, for example, an elevator belt, a timing belt, a V-belt, or a conveyor belt.

[0102] The power transmission belt 7 is endless and has a rectangular cross section in a plane perpendicular to its extending direction. The width direction of the power transmission belt 7 is defined as the X direction, the extending direction of the power transmission belt 7 is defined as the Y direction, and the direction perpendicular to the X direction and the Y direction is defined as the Z direction.

[0103] The power transmission belt 7 has a resin base body 72 and a belt rope 71 serving as a tension member provided inside the base body 72. The belt rope 71 is made by twisting together element wires made of metal wires. The belt ropes 71 extend in the Y direction and are arranged in multiple rows in the X direction.

[0104] When inspecting the belt rope 71, the demagnetizer / magnetizer 2 and sensor unit 3 are moved relatively in the +Y direction along the extension direction of the belt rope 71. The demagnetizer / magnetizer 2 is placed forward of the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and sensor unit 3 is the direction crossing the belt rope 71, i.e., the X direction. The detection element 31 faces the power transmission belt 7, which is an object including the belt rope 71 as a tension member, and detects a magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the power transmission belt 7, which is an object.

[0105] Since the belt rope 71 is endless, like the wire rope 61 of the moving handrail 6, the overlap distance may be negative (see FIG. 6) or positive (see FIG. 7).

[0106] When the overlap distance of the belt rope 71 is negative, the tensile material inspection device 1 executes the first operation mode and demagnetizes the belt rope 71 with the demagnetizer / magnetizer 2. When the overlap distance of the belt rope 71 is positive, the tensile material inspection device 1 executes the second operation mode and magnetizes the belt rope 71 with the demagnetizer / magnetizer 2. The tensile material inspection device 1 detects defects in the belt rope 71 based on the magnetic field detected by the magnetic sensor 30.

[0107] 13 and 14 are a perspective view and a cross-sectional view showing a method for inspecting the carcass 81 of the tire 8. The tire 8 is, for example, a radial tire.

[0108] The tire 8 has a rubber substrate 80, a plurality of carcasses 81 that form the framework of the tire 8, a belt 82 that is a reinforcing band, and a pair of beads 83 (FIG. 14) that are connected to the wheel.

[0109] The carcass 81 extends in a U-shape in a cross section perpendicular to the circumferential direction of the tire 8 (indicated by arrow R in FIG. 13 ). The carcass 81 has both end portions 81 a on the inner circumferential side of the tire 8. The belt 82 extends in the circumferential direction along the outer periphery of the tire 8. The beads 83 are connected to the end portions 81 a of the carcass 81 and extend in the circumferential direction along the inner periphery of the tire 8.

[0110] The carcass 81 is, for example, a strand of metal wire. The belt 82 is, for example, a cylindrical metal belt. The bead 83 is, for example, a bundle of metal wires.

[0111] 13 and 14, the extension direction of the carcass 81, which is the tensile member to be inspected, is defined as the Y direction, the width direction of the carcass 81 (i.e., the circumferential direction of the tire 8) is defined as the X direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction.

[0112] When inspecting the carcass 81, the demagnetizer / magnetizer 2 and sensor unit 3 are moved relatively in the +Y direction along the extension direction of the carcass 81. The demagnetizer / magnetizer 2 is placed forward of the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and sensor unit 3 is the direction crossing the carcass 81, i.e., the X direction. The detection element 31 faces the tire 8, which is an object including the carcass 81 as a tensile body, and detects a magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the tire 8, which is an object.

[0113] Although Figures 13 and 14 show the control device 15 together with the demagnetizer / magnetizer 2 and the sensor unit 3, the control device 15 may be placed in a location away from the demagnetizer / magnetizer 2 and the sensor unit 3.

[0114] When the detection element 31 of the sensor unit 3 faces the end 81a (FIG. 14) of the carcass 81, a strong magnetic field may act on the detection element 31. Therefore, when inspecting the carcass 81, the tensile material inspection device 1 executes the first operation mode and demagnetizes the carcass 81 using the demagnetizer / magnetizer 2. The tensile material inspection device 1 detects defects in the carcass 81 based on the magnetic field detected by the magnetic sensor 30.

[0115] <Inspection of Tire Belt> Figures 15 and 16 are a perspective view and a cross-sectional view showing a method for inspecting a belt 82 of a tire 8. The configuration of the tire 8 is as described with reference to Figures 13 and 14. In the example shown in Figures 15 and 16, the demagnetizer / magnetizer 2 and the sensor unit 3 are placed opposite the side surface of the tire 8.

[0116] 15 and 16, the extension direction of the belt 82, which is the tensile member to be inspected (i.e., the circumferential direction of the tire 8), is defined as the Y direction, the direction across the belt 82 (i.e., the radial direction of the tire 8) is defined as the X direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction.

[0117] When inspecting the belt 82, the demagnetizer / magnetizer 2 and sensor unit 3 are moved relatively in the +Y direction along the extension direction of the belt 82. The demagnetizer / magnetizer 2 is placed forward of the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and sensor unit 3 is the direction crossing the belt 82, i.e., the X direction. The detection element 31 faces the tire 8, which is an object including the belt 82 as a tensile body, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the tire 8, which is an object.

[0118] Although FIG. 15 shows the control device 15 together with the demagnetizer / magnetizer 2 and the sensor unit 3, the control device 15 may be placed in a location away from the demagnetizer / magnetizer 2 and the sensor unit 3.

[0119] Because the belt 82 is endless, like the wire rope 61 of the moving handrail 6, the overlap distance may be negative (see FIG. 6) or positive (see FIG. 7).

[0120] When the overlap distance A of the belt 82 is negative, the tensile material inspection device 1 executes the first operation mode and demagnetizes the belt 82 using the demagnetizer / magnetizer 2. When the overlap distance A of the belt 82 is positive, the tensile material inspection device 1 executes the second operation mode and magnetizes the belt 82 using the demagnetizer / magnetizer 2. The tensile material inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30.

[0121] 17 is a cross-sectional view showing another example of the relative position of the tensile body inspection device 1 with respect to the tire 8. In the example shown in FIG. 17, the demagnetizer / magnetizer 2 and the sensor unit 3 are arranged to face the inner circumferential surface of the tire 8.

[0122] In Figure 17, the extension direction of the belt 82, which is the tensile member to be inspected (i.e., the width direction of the tire 8), is the Y direction, the width direction of the belt 82 (i.e., the circumferential direction of the tire 8) is the X direction, and the direction perpendicular to both the X direction and the Y direction is the Z direction.

[0123] When inspecting the belt 82, the demagnetizer / magnetizer 2 and the sensor unit 3 are moved relatively in the +Y direction along the extension direction of the belt 82. The demagnetizer / magnetizer 2 is placed forward in the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is the direction across the belt 82, i.e., the X direction.

[0124] The first and second operation modes of the tensile material inspection device 1 are as described with reference to Figures 15 and 16. The tensile material inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30.

[0125] In the example shown in Figure 17, the opposing area between the demagnetizer / magnetizer 2 and the sensor unit 3 and the belt 82 can be made larger than in the examples shown in Figures 15 and 16, thereby further improving detection accuracy.

[0126] 18 is a cross-sectional view showing another example of the relative position of the tensile body inspection device 1 with respect to the tire 8. In the example shown in FIG. 18, the demagnetizer / magnetizer 2 and the sensor unit 3 are arranged to face the outer peripheral surface of the tire 8.

[0127] When inspecting the belt 82, the demagnetizer / magnetizer 2 and the sensor unit 3 are moved relatively in the +Y direction along the extension direction of the belt 82. The demagnetizer / magnetizer 2 is placed forward in the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is the direction across the belt 82, i.e., the X direction.

[0128] The first and second operation modes of the tensile material inspection device 1 are as described with reference to Figures 15 and 16. The tensile material inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30.

[0129] 18, the demagnetizer / magnetizer 2 and the sensor unit 3 face the outer peripheral surface of the tire 8, so the lengths of the demagnetizer / magnetizer 2 and the sensor unit 3 can be made longer than in the example shown in Fig. 17. Therefore, the facing area between the demagnetizer / magnetizer 2 and the sensor unit 3 and the belt 82 can be made even larger, and the detection accuracy can be further improved.

[0130] <Inspection of reinforcing bars in a concrete structure> Fig. 19 is a perspective view showing a method for inspecting reinforcing bars 91 in a concrete structure 9. The concrete structure 9 is, for example, reinforced concrete. The concrete structure 9 has concrete 90 and a plurality of reinforcing bars 91 and a plurality of reinforcing bars 92 arranged inside the concrete 90. The reinforcing bars 91 and the reinforcing bars 92 are arranged in directions perpendicular to each other. Both the reinforcing bars 91 and the reinforcing bars 92 are, for example, round steel bars.

[0131] The extension direction of reinforcing bars 91 is the Y direction, the extension direction of reinforcing bars 92 is the X direction, and the direction perpendicular to the X and Y directions is the Z direction. Multiple reinforcing bars 91 are arranged side by side in the X direction, and multiple reinforcing bars 92 are arranged side by side in the Y direction.

[0132] When inspecting reinforcing bars 91 using the tensile body inspection device 1, the demagnetizer / magnetizer 2 and sensor unit 3 are moved relatively in the +Y direction along the extension direction of the reinforcing bars 91. The demagnetizer / magnetizer 2 is placed forward of the direction of relative movement, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and sensor unit 3 is the direction crossing the reinforcing bars 91, i.e., the X direction. The detection element 31 faces the concrete structure 9, which is an object including reinforcing bars 91, 92 as tensile bodies, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the concrete structure 9, which is an object.

[0133] In large concrete structures 9, multiple reinforcing bars 91 may be used in combination in the longitudinal direction, so the overlap distance may be negative (see Figure 6) or positive (see Figure 7).

[0134] When the overlap distance A of the reinforcing bar 91 is negative, the tensile material inspection device 1 executes a first operation mode and demagnetizes the reinforcing bar 91 using the demagnetizer / magnetizer 2. When the overlap distance A of the reinforcing bar 91 is positive, the tensile material inspection device 1 executes a second operation mode and magnetizes the reinforcing bar 91 using the demagnetizer / magnetizer 2. The tensile material inspection device 1 detects defects in the reinforcing bar 91 based on the magnetic field detected by the magnetic sensor 30.

[0135] In addition, the reinforcing bar 92 can also be inspected by changing the orientation of the tensile material inspection device 1 and moving the demagnetizer / magnetizer 2 and the sensor unit 3 relatively in the extension direction of the reinforcing bar 92.

[0136] Here, the case has been described where the concrete structure 9 is reinforced concrete and the tension members are reinforcing bars 91, 92. However, the concrete structure 9 may be a prestressed concrete (PC) steel material, and the tension members may be steel materials such as PC steel materials.

[0137] In the examples shown in Figures 12 to 19, examples of inspecting various tensile bodies using the tensile body inspection device 1 of embodiment 1 are described, but this is not limited to the tensile body inspection device 1 of embodiment 1, and modified examples, or the tensile body inspection devices 1A, 1B, and 1C of embodiment 2 or embodiment 3 may also be used.

[0138] Furthermore, the tension body inspection devices 1, 1A, 1B, and 1C of the first to third embodiments and the modified examples can be used to inspect tension bodies other than the above-mentioned wire ropes, carcasses, belts, and reinforcing bars.

[0139] Although the preferred embodiments have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various improvements and modifications can be made.

[0140] 1, 1A, 1B, 1C Tensile body inspection device, 2, 2A, 2B, 2C Demagnetizer / magnetizer, 3 Sensor unit, 5 Tensile body inspection unit, 6 Moving handrail (object), 7 Power transmission belt (object), 8 Tire (object), 9 Concrete structure (object), 15 Control device, 21, 24 Magnetic body, 22 Coil, 23 Power source, 25, 28 Housing, 27 Permanent magnet, 30 Magnetic sensor, 31 Detection element, 32 Detection magnet, 33 Signal processing circuit, 35 Housing, 36 Roller, 50 Housing, 51 Roller, 61 Wire rope (tension body), 71 Belt rope (tension body), 81 Carcass (tension body), 82 Belt (tension body), 91, 92 Reinforcing bar (tension body).

Claims

1. A detection element that faces an object including a tension body and detects a magnetic field; A detection magnet that generates a magnetic field acting on the object; A magnetic sensor having a demagnetizer that faces the object at a position separated from the magnetic sensor in the extension direction of the tension body and demagnetizes the tension body; a magnetizer that faces the object at a position separated from the magnetic sensor in the extension direction of the tension body and magnetizes the tension body; Equipped with When the tension body has a gap in the extension direction, a first operation mode is executed in which the tension body is demagnetized by the demagnetizer; When the tension body has an overlapping portion in the extending direction, a second operation mode is executed in which the tension body is magnetized by the magnetizer. A tension member inspection device characterized by:

2. In the first operation mode, an AC magnetic field is applied to the tension body from the demagnetizer; In the second operation mode, a DC magnetic field is applied to the tension body from the magnetizer.

2. The tension member inspection device according to claim 1, further comprising:

3. the demagnetizer includes a magnetic body facing the object, a coil wound around the magnetic body, and a power source that supplies a current to the coil, In the first operating mode, the power supply supplies an alternating current to the coil.

3. The tension member inspection device according to claim 2.

4. the magnetizer includes a magnetic body facing the object, a coil wound around the magnetic body, and a power source that supplies a current to the coil; In the second operating mode, a direct current is supplied from the power source to the coil.

3. The tension member inspection device according to claim 2.

5. The magnetic body has a first magnetic pole portion and a second magnetic pole portion that face each other in the extending direction of the tension member.

4. The tension member inspection device according to claim 3.

6. The magnetic body has a first magnetic pole portion facing the tension member and a second magnetic pole portion facing the opposite side.

4. The tension member inspection device according to claim 3.

7. The demagnetizer and the magnetizer are integrally configured.

2. The tension member inspection device according to claim 1 .

8. The demagnetizer and the magnetizer are configured separately.

2. The tension member inspection device according to claim 1 .

9. The magnetizer, the demagnetizer, and the magnetic sensor are mounted in a common housing.

2. The tension member inspection device according to claim 1 .

10. and a processing circuit for processing the output of the detection element.

2. The tension member inspection device according to claim 1 .

11. The object is a moving handrail of a passenger conveyor, The tension member is a wire rope of the handrail.

11. The tension member inspection device according to claim 1, wherein the tension member is a tension member having a tension component.

12. the object is a power transmission belt; The tension member is a wire rope of the power transmission belt.

11. The tension member inspection device according to claim 1, wherein the tension member is a tension member having a tension component.

13. the object is a tire, The tension member is a carcass or a belt of the tire.

11. The tension member inspection device according to claim 1, wherein the tension member is a tension member having a tension component.

14. the object is a concrete structure, The tension member is a reinforcing bar or a steel material of the concrete structure.

11. The tension member inspection device according to claim 1, wherein the tension member is a tension member having a tension component.