Tensile body inspection device

Abstract

A tensile body inspection device (1) is provided with a magnetic sensor (30) and a demagnetizer (2), the magnetic sensor (30) having: a detection element (31) that faces an object (6) including a tensile body (61) and detects a magnetic field; and a detection magnet (32) that generates a magnetic field acting on the object (6), and the demagnetizer (2) faces the object (6) at a position separated from the magnetic sensor (30) in the extension direction of the tensile body (61) and demagnetizes the tensile body (61).

Description

Technical Field

[0001] The present disclosure relates to a tensile body inspection device. Background Art

[0002] Moving handrails in passenger conveyors, such as escalators, incorporate cables as tensile strength members. Cables are made, for example, from twisted wires. Cable wires can sometimes break or unravel due to fatigue. Therefore, an inspection device has been developed that uses magnetic sensors to detect cable defects (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 7020564 (refer to Figure 4 ) Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Here, the moving handrail of the passenger conveyor is annular and has a joint. In the joint of the moving handrail, there are cases where both ends of the cable overlap or separate.

[0008] The magnetic field reaching the magnetic sensor differs when the cable ends are aligned and when they are separated. When the cable ends are separated, a strong magnetic field acts on the magnetic sensor in the gap between them, potentially exceeding the sensor's detection range. Alternatively, expanding the sensor's detection range is an option, but this would reduce detection accuracy.

[0009] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a tensile member inspection device having high detection accuracy.

[0010] Means for solving problems

[0011] The tensile body inspection device disclosed in the present invention includes a magnetic sensor and a demagnetizer. The magnetic sensor has: a detection element, which is opposite to an object including the tensile body and detects the magnetic field; and a detection magnet, which generates a magnetic field acting on the object. The demagnetizer is opposite to the object at a position away from the magnetic sensor in the extension direction of the tensile body and demagnetizes the tensile body.

[0012] Effects of the Invention

[0013] The disclosed tensile member inspection device demagnetizes the tensile member using a demagnetizer. The magnetic field of a detection magnet then acts on the member, and the detection element detects changes in the magnetic field. This prevents strong magnetic fields from acting on the magnetic sensor, even when there's a gap between the ends of the tensile member. As a result, a tensile member inspection device with high detection accuracy can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view showing the tensile body inspection device according to the first embodiment.

[0015] Figure 2 This is a cross-sectional view showing the tensile body inspection device according to the first embodiment.

[0016] Figure 3 This is a schematic diagram illustrating the detection principle of the magnetic sensor according to the first embodiment.

[0017] Figure 4 These are diagrams (A), (B), and (C) showing an example of arrangement of tension members at a joint portion of a moving handrail according to the first embodiment.

[0018] Figure 5 These are diagrams (A), (B), and (C) showing another arrangement example of the tension members at the joint portion of the moving handrail according to the first embodiment.

[0019] Figure 6 Schematic diagram showing the magnetic field at the gap between the ends of the tension member according to the first embodiment.

[0020] Figure 7 Schematic diagram showing the magnetic field at the overlapping portion of the tension member according to the first embodiment.

[0021] Figure 8 This is a cross-sectional view showing a tensile member inspection device according to a modified example of the first embodiment.

[0022] Figure 9 (A) and (B) are cross-sectional views showing a tensile member inspection device according to a second embodiment.

[0023] Figure 10 This is a perspective view showing a tensile member inspection device according to a third embodiment.

[0024] Figure 11 This is a cross-sectional view showing a tensile body inspection device according to a third embodiment.

[0025] Figure 12 This is a schematic diagram showing an example in which the tensile member inspection device of the first embodiment is used for inspecting a cable with a rope.

[0026] Figure 13This is a perspective view showing an example in which the tensile member inspection device according to the first embodiment is used for tire carcass inspection.

[0027] Figure 14 This is a cross-sectional view showing an example in which the tensile member inspection device according to the first embodiment is used for tire carcass inspection.

[0028] Figure 15 This is a perspective view showing an example in which the tensile member inspection device according to the first embodiment is used for tire belt inspection.

[0029] Figure 16 This is a cross-sectional view showing an example in which the tensile member inspection device according to the first embodiment is used for tire belt inspection.

[0030] Figure 17 This is a cross-sectional view showing another example of using the tensile member inspection device of the first embodiment for tire belt inspection.

[0031] Figure 18 This is a cross-sectional view showing another example of using the tensile member inspection device of the first embodiment for tire belt inspection.

[0032] Figure 19 This is a perspective view showing an example in which the tensile member inspection device according to the first embodiment is used for inspecting reinforcement bars of a concrete structure. DETAILED DESCRIPTION

[0033] Hereinafter, a tensile member inspection device according to an embodiment will be described with reference to the accompanying drawings. The following embodiments are merely examples, and the embodiments may be modified as appropriate, and the embodiments may be combined as appropriate.

[0034] Implementation method 1.

[0035] <Structure of the tensile body inspection device 1>

[0036] Figure 1 This is a perspective view showing the tensile body inspection device 1 according to the first embodiment. Figure 2 1 is a cross-sectional view showing the tensile body inspection device 1 according to the first embodiment. Figure 1 As shown, the tensile testing device 1 is installed on the upper part of the moving handrail 6. The moving handrail 6 is installed on a passenger conveyor. The passenger conveyor is, for example, an escalator, a moving walkway, etc.

[0037] The moving handrail 6 includes a resin base 62 and a cable 61 as a tension member provided inside the base 62. The cable 61 is made of a magnetic body.

[0038] The base 62 is made of a resin such as rubber or polyurethane. It is annular. Specifically, it is formed by joining the longitudinal ends of a long strip of resin. Furthermore, the base 62 has a flat portion 62a in a cross-section perpendicular to its extension direction and U-shaped curved portions 62b on either side of its width.

[0039] The cables 61 are formed by twisting together wires made of metal wires such as carbon steel. A plurality of cables 61 are arranged in parallel along the width direction inside the flat portion 62a of the base 62. Like the base 62, the cables 61 are ring-shaped.

[0040] In the following, the width direction of the movable armrest 6 is referred to as the X direction, and the extending direction of the movable armrest 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. Figure 1 In the figures etc., the Y direction is a linear direction, but it may be a circumferential direction, for example.

[0041] The tensile member inspection device 1 is positioned opposite the flat portion 62a of the movable handrail 6. The tensile member inspection device 1 includes a demagnetizer / magnetizer 2 and a sensor unit 3. The demagnetizer / magnetizer 2 and the sensor unit 3 are spaced apart in the Y direction. Furthermore, the demagnetizer / magnetizer 2 and the sensor unit 3 are formed to be elongated in the direction transverse to the movable handrail 6, i.e., in the X direction.

[0042] The demagnetizer / magnetizer 2 is an integrated demagnetizer and a magnetizer. When the demagnetizer / magnetizer 2 demagnetizes the cable 61, it can be referred to as a "demagnetizer." When the demagnetizer / magnetizer 2 magnetizes the cable 61, it can be referred to as a "magnetizer."

[0043] like Figure 2 As shown, the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the moving handrail 6 in the extending direction of the moving handrail 6. Here, the relative movement direction of the demagnetizer / magnetizer 2 and the sensor unit 3 relative to the moving handrail 6 is set as the +Y direction.

[0044] Specifically, the demagnetization / magnetization device 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 demagnetization / magnetization device 2 and the sensor unit 3 may be fixed and the movable handrail 6 may be moved in the -Y direction.

[0045] If the positions of the demagnetizer / magnetizer 2 and the sensor unit 3 are fixed and the movable 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.

[0046] The demagnetization / magnetization device 2 is arranged in front of the relative movement direction of the demagnetization / magnetization device 2 and the sensor unit 3 relative to the movable handrail 6 , that is, in the +Y direction.

[0047] The demagnetizer / magnetizer 2 is positioned opposite the movable handrail 6, which is the object, at a position away from the magnetic sensor 30 in the direction in which the cable 61, which is the tension member, extends, and demagnetizes the cable 61, which is the tension member. Furthermore, the demagnetizer / magnetizer 2 is positioned opposite the movable handrail 6, which is the object, at a position away from the magnetic sensor 30 in the direction in which the cable 61, which is the tension member, extends, and magnetizes the cable 61, which is the tension member.

[0048] The sensor unit 3 includes a magnetic sensor 30, a signal processing circuit 33, and a housing 35 that accommodates these. The housing 35 forms the outer shell of the sensor unit 3. A pair of rollers 36 that abut against the movable handrail 6 are provided at both ends of the housing 35 in the Y direction.

[0049] The magnetic sensor 30 includes a detection element 31 positioned opposite the moving handrail 6 and a detection magnet 32 ​​positioned opposite the moving handrail 6 (in this case, the +Z direction) across the detection element 31. The detection element 31 faces the moving handrail 6, an object including a cable 61 serving as a tensile member, and detects magnetic fields. The detection magnet 32 ​​generates a magnetic field (described later as a detection magnetic field F) that acts on the moving handrail 6. The roller 36 maintains a constant distance between the magnetic sensor 30 and the moving handrail 6.

[0050] like Figure 1 As shown, the detection element 31 and the detection magnet 32 ​​of the magnetic sensor 30 extend in the direction transverse to the movable handrail 6, that is, in the X direction. The length of the detection element 31 and the detection magnet 32 ​​in the X direction is preferably greater than the width of the flat portion 62a of the movable handrail 6.

[0051] Detection element 31 is composed of a magnetic detection element, a magnetoresistive element, or a pickup coil. Examples of magnetic detection elements include an AMR (Anisotropic Magneto Resistance) element, a GMR (Giant Magneto Resistance) element, and a TMR (Tunnel Magneto Resistance) element. Detection element 31 detects changes in the magnetic field.

[0052] The detection magnet 32 ​​is composed of, for example, a permanent magnet. The detection magnet 32 ​​has an N pole on the side facing the movable handrail 6 and an S pole on the opposite side. The detection element 31 is located between the detection magnet 32 ​​and the movable handrail 6. Alternatively, the detection magnet 32 ​​may be an electromagnet.

[0053] The signal processing circuit 33 is connected to the signal processing circuit 33 through the cable 34 ( Figure 1 ) is connected to the detection element 31 and is also connected to the control device 15 via the lead 14. The signal processing circuit 33 receives the output signal of the detection element 31 and transmits it to the control device 15. The signal processing circuit 33 does not need to be mounted on the sensor unit 3; it can be placed at a position where it can detect the output signal of the detection element 31.

[0054] The control device 15 is a computer or the like installed externally to the tensile-resistant body inspection device 1. The control device 15 includes a CPU (Central Processing Unit), a storage device such as a memory, a display unit for displaying information, and an input unit for user input. The control device 15 can be located separately from the demagnetizer / magnetizer 2 and the sensor unit 3.

[0055] The demagnetizer / magnetizer 2 includes 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 are provided at both ends of the housing 25 in the Y direction, which contact the movable handrail 6.

[0056] Furthermore, since the distance between the demagnetizer / magnetizer 2 and the movable handrail 6 does not need to be managed with as high precision as the distance between the magnetic sensor 30 and the movable handrail 6, the demagnetizer / magnetizer 2 does not necessarily need to include the roller 26. In other words, the demagnetizer / magnetizer 2 only needs to be held so as to be movable relative to the movable handrail 6.

[0057] The magnetic body 21 has a first magnetic pole portion 21a and a second magnetic pole portion 21b facing each other in the Y direction, and a yoke portion 21c connecting 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.

[0058] The magnetic body 21 extends in the direction crossing the movable handrail 6, that is, in the X direction. The length of the magnetic body 21 in the X direction is preferably equal to the length of the flat portion 62a ( Figure 1 ) is greater than the width of the

[0059] like Figure 2 As shown, coil 22 is wound around yoke 21c of magnetic body 21, with the winding axis oriented in the Y direction. Power supply 23 flows direct current or alternating current through coil 22. The current flowing through coil 22 generates a magnetic field in magnetic body 21. The polarity of first magnetic pole portion 21a and second magnetic pole portion 21b is switched by the direction of the current supplied from power supply 23 to coil 22.

[0060] 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, magnetizing the cable 61 of the handrail 6. Magnetization of the cable 61 means increasing magnetization within the cable 61.

[0061] 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, demagnetizing the cable 61 of the handrail 6. Demagnetizing the cable 61 means reducing magnetization in the cable 61.

[0062] The power supply 23 is connected to the control device 15 via 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 different from the control device 15.

[0063] <Defect Detection Principle of Magnetic Sensor 30>

[0064] Figure 3 This is a schematic diagram illustrating the principle of detecting defects in the cable 61 using the magnetic sensor 30. The detection magnet 32 ​​is positioned with its north pole 32a facing the moving handrail 6 and its south pole 32b facing the opposite side. The detection element 31 is positioned between the north pole 32a of the detection magnet 32 ​​and the moving handrail 6.

[0065] The magnetic flux from the north pole 32a of the detection magnet 32 ​​returns to the south pole 32b of the detection magnet 32. That is, the detection magnet 32 ​​generates a detection magnetic field F. The detection element 31 and the movable handrail 6 are located in this detection magnetic field F.

[0066] After passing through the demagnetization / magnetization device 2 ( Figure 2 ) When the cable 61 is magnetized, the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the +Y direction of the movable handrail 6, so that the remaining magnetized portion of the cable 61 is opposite to the detection element 31 of the magnetic sensor 30.

[0067] The detection element 31 of the magnetic sensor 30 detects the combined magnetic field resulting from the detection magnetic field F generated by the detection magnet 32 ​​and the magnetic field generated by the residual magnetization within the cable 61. Therefore, if the cable 61 of the moving handrail 6 is not defective, the detection element 31 will always detect a constant magnetic field.

[0068] A defect in the cable 61 is, for example, a break in the wire 61c of the cable 61. If the wire 61c of the cable 61 of the moving handrail 6 breaks and becomes broken, and the wire 61c protrudes toward the surface of the moving handrail 6, the detection magnetic field F acting on the detection element 31 changes, and the detection element 31 detects this change.

[0069] 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 indicating that a defect in the cable 61 has been detected on the display unit.

[0070] <Regarding the Joint of the Moving Handrail 6>

[0071] Next, the joint portion of the movable handrail 6 will be described. Figure 4 (A)~(C) and Figure 5 (A) to (C) are schematic diagrams showing examples of arrangement of the cables 61 at the joints of the moving handrail 6 .

[0072] As described above, the movable handrail 6 is annular and has a joint. At the joint of the movable handrail 6, one end (referred to as the first end) 61a of the cable 61 and the other end (referred to as the second end) 61b may be separated in the Y direction, or one end (referred to as the first end) 61a of the cable 61 and the other end (referred to as the second end) 61b may overlap in the Y direction.

[0073] exist Figure 4 In the examples shown in (A) to (C), the first end 61a and the second end 61b of the cable 61 are separated in the Y direction. The gap between the first end 61a and the second end 61b of the cable 61 is referred to as an end-to-end gap 64 .

[0074] exist Figure 4 In the example shown in (A), the Y-direction positions of the gaps 64 between the ends of the plurality of cables 61 of the moving handrail 6 are the same. Figure 4 (B) and Figure 4 In the example shown in (C), the Y-direction positions of the gaps 64 between the ends of the plurality of cables 61 of the moving handrail 6 differ depending on the X-direction positions of the cables 61 .

[0075] Specifically, in Figure 4 In (B), the closer the cable 61 is to the +X direction, the closer the gap 64 between its ends is to the -Y direction. Figure 4 In (C), the closer the cable 61 is to the X-direction center of the moving handrail 6, the closer the gap 64 between its ends is to the -Y direction.

[0076] like Figure 4 As shown in (A) to (C), when the first end 61a and the second end 61b of the cable 61 are separated in the Y direction, the Y direction distance between these ends 61a and 61b (i.e., the gap 64 between the ends) is called the negative overlap distance A.

[0077] On the other hand, Figure 5 In the examples shown in (A) to (C), the portion including the first end 61a and the portion including the second end 61b of the cable 61 overlap. The overlapping portion of the portion including the first end 61a and the portion including the second end 61b of the cable 61 is referred to as an overlapping portion 65.

[0078] exist Figure 5 In (A), the Y-direction positions of the overlapping portions 65 of the plurality of cables 61 of the moving handrail 6 are the same. Figure 5 (B) and Figure 5 In (C), the Y-direction position of the overlapping portion 65 of the plurality of cables 61 of the moving handrail 6 differs depending on the X-direction position of the cables 61 .

[0079] Specifically, in Figure 5 In (B), the closer the cable 61 is to the +X direction, the closer its overlapping portion 65 is to the -Y direction. Figure 5 In (C), the closer the cable 61 is to the X-direction center of the moving handrail 6, the closer its overlapping portion 65 is to the -Y direction.

[0080] like Figure 5 As shown in (A) to (C), when the portion including the first end 61a of the cable 61 overlaps with the portion including the second end 61b, the length in the Y direction of these overlapping portions (i.e., overlapping portion 65) is referred to as the positive overlapping distance A.

[0081] In the case where the overlap distance A of the cable 61 is negative ( Figure 4 (A) to (C)) and the case where the overlap distance A is positive ( Figure 5 In (A) to (C), the magnetic field acting on the detection element 31 of the magnetic sensor 30 is different. This will be described below.

[0082] Figure 6 : is a diagram showing the magnetic field in the cable 61 when the overlap distance A of the cable 61 is negative. Figure 3 As explained above, after passing through the demagnetization / magnetization device 2 ( Figure 2 ) When the cable 61 is magnetized, a magnetic field in the Y direction (here, the -Y direction) is generated by the residual magnetization in the cable 61.

[0083] Since there is no conductor in the gap 64 between the ends of the cable 61, the magnetic field spreads outward as shown by the arrow C1. In other words, a strong magnetic field is generated around the gap 64 between the ends. When the magnetic sensor 30 reaches a position facing the gap 64 between the ends, the magnetic field generated in the gap 64 between the ends acts on the detection element 31 ( Figure 3 ), therefore, the magnetic field detected by the detection element 31 increases.

[0084] Therefore, the detection element 31 needs to have a larger detectable range (also called dynamic range) so that it can also detect such magnetic fields. However, if the detectable range of the detection element 31 is increased, the detection accuracy will decrease.

[0085] Figure 7 is a diagram showing the magnetic field in the cable 61 when the overlap distance A of the cable 61 is positive. Figure 6 Likewise, a magnetic field in the Y direction (here, −Y direction) is generated by the residual magnetization in the cable 61 .

[0086] In this case, the conductors are in contact with each other at the overlapping portion 65 of the cable 61. Therefore, as shown by arrow C2, the magnetic field does not spread outward but moves from one end side to the other end side of the cable 61. Therefore, the magnetic field acting on the detection element 31 of the magnetic sensor 30 does not change significantly.

[0087] Therefore, when the tensile member inspection device 1 of Embodiment 1 uses a movable handrail 6 in which the overlap distance A of the cables 61 is negative, that is, when the cables 61 serving as the tensile member have gaps in the extension direction, the cables 61 are demagnetized by the demagnetizer / magnetizer 2. The operating mode of the tensile member inspection device 1 in this case is referred to as the first operating mode (or demagnetization mode). Specifically, the first operating mode is an operating mode in which the cables 61 serving as the tensile member are demagnetized by the demagnetizer.

[0088] In the first operating mode, the power supply 23 of the demagnetizer / magnetizer 2 flows an AC current through 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. Specifically, the demagnetizer applies an AC magnetic field to the cable 61, which serves as a tensile member. This demagnetizes the portion of the cable 61 facing the demagnetizer / magnetizer 2, reducing the magnetization of that portion.

[0089] When the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the cable 61 in the +Y direction so that the demagnetized portion of the cable 61 faces the magnetic sensor 30 , the detection magnetic field F of the detection magnet 32 ​​acts on this portion.

[0090] When the wire 61c of the cable 61 is broken, the detection element 31 of the magnetic sensor 30 can detect this by the change of the detection magnetic field F. Since the cable 61 is demagnetized before the magnetic sensor 30 detects it, even if Figure 6 As shown, the magnetic field spreads to the surroundings at the gap 64 between the ends, and the magnetic field acting on the detection element 31 also weakens.

[0091] Furthermore, in the first operation mode, since the cable 61 is demagnetized by the demagnetizer / magnetizer 2, the magnetic field generated by the residual magnetization in the cable 61 becomes extremely small, and even with only the detection magnetic field F of the detection magnet 32, a break in the wire 61 c of the cable 61 can be detected.

[0092] On the other hand, when using a movable handrail 6 in which the overlap distance A of the cables 61 is positive, that is, when the cables 61, serving as the tensile member, have overlapping portions in the extension direction, no significant magnetic field changes will act on the detection element 31. Therefore, the tensile member inspection device 1 magnetizes the cables 61 using the demagnetization / magnetizer 2. The operating mode of the tensile member inspection device 1 at this time is referred to as the second operating mode (or magnetization mode). Specifically, the second operating mode is an operating mode in which the cables 61, serving as the tensile member, are magnetized by the magnetizer.

[0093] In the second operating mode, a DC current flows through coil 22 from power supply 23 of demagnetizer / magnetizer 2, generating a DC magnetic field between first magnetic pole portion 21a and second magnetic pole portion 21b of magnetic body 21. Specifically, a DC magnetic field is applied from the magnetizer to cable 61, which serves as a tensile member. This uniformly aligns the magnetization direction within cable 61 before detection by magnetic sensor 30.

[0094] When the demagnetizer / magnetizer 2 and the sensor unit 3 move relative to the cable 61 in the +Y direction so that the magnetized portion of the cable 61 faces the magnetic sensor 30 , the detection magnetic field F of the detection magnet 32 ​​acts on this portion.

[0095] When a break occurs in the wire 61 c of the cable 61, the detection element 31 of the magnetic sensor 30 can detect this based on changes in the combined magnetic field between the magnetic field generated by the residual magnetization within the cable 61 and the detection magnetic field F. Since the detection element 31 detects the combined magnetic field, a break in the wire 61 c of the cable 61 can be detected with higher accuracy.

[0096] The first and second operating modes of the tensile member inspection device 1 are controlled by the control device 15 according to the type of the cable 61. Specifically, the control device 15 selects the first operating mode for cables 61 having a negative overlap distance A and selects the second operating mode for cables 61 having a positive overlap distance A.

[0097] The user of the tensile member inspection device 1 is, for example, an operator performing maintenance and inspection of a passenger conveyor. Whether the overlap distance A of the cable 61 is positive or negative varies depending on the type of movable handrail 6. Therefore, the user can input the positive or negative value of the overlap distance A into the input unit of the control device 15. Alternatively, the control device 15 can perform an automatic determination.

[0098] Here, the demagnetization / magnetizer 2 performs magnetization and demagnetization of the cable 61 , but a magnetizer and a demagnetizer may also be provided.

[0099] <Effects of Implementation Method 1>

[0100] As described above, the anti-tension body inspection device 1 of embodiment 1 includes a magnetic sensor 30 and a demagnetizer / magnetizer 2. The magnetic sensor 30 has: a detection element 31, which is opposite to the movable handrail 6 (i.e., the object) including the cable 61 (i.e., the anti-tension body) and detects changes in the magnetic field; and a detection magnet 32, which generates a magnetic field acting on the movable handrail 6. The demagnetizer / magnetizer 2 is opposite to the movable handrail 6 at a position away from the magnetic sensor 30 in the extension direction of the cable 61, and magnetizes or demagnetizes the cable 61.

[0101] Therefore, when the overlap distance A of the cable 61 of the moving handrail 6 is negative, the cable 61 can be demagnetized by the demagnetizer / magnetizer 2 (first operating mode). This prevents a strong magnetic field from acting on the detection element 31 of the magnetic sensor 30. As a result, there is no need to expand the detectable range of the detection element 31, and detection accuracy can be improved.

[0102] Furthermore, when the overlap distance A of the cable 61 of the movable handrail 6 is positive, the cable 61 can be magnetized by the demagnetizer / magnetizer 2 (second operating mode). This allows the detection element 31 of the magnetic sensor 30 to detect the combined magnetic field of the magnetized cable 61 and the detection magnetic field F generated by the detection magnet 32, thereby improving detection accuracy.

[0103] When the moving handrail 6 is in use, the cable 61 may be non-uniformly magnetized by the magnetic force of magnets or the like possessed by passengers. However, by magnetizing or demagnetizing the inside of the cable 61 using the demagnetizer / magnetizer 2 , this influence can be suppressed.

[0104] Furthermore, since the demagnetizer / magnetizer 2 applies an AC magnetic field to the cable 61 in the first operation mode and a DC magnetic field to the cable 61 in the second operation mode, the cable 61 can be efficiently demagnetized and magnetized.

[0105] Furthermore, the magnetic body 21 has a first magnetic pole portion 21a and a second magnetic pole portion 21b facing each other in the extending direction of the cable 61 (ie, the Y direction), so that a magnetic field can be generated between the magnetic pole portions 21a and 21b, and the cable 61 can be magnetized efficiently.

[0106] Furthermore, since the signal processing circuit 33 for processing the output of the detection element 31 is provided, a detection signal indicating a break in the wire 61 c of the cable 61 can be output to the control device 15 based on changes in the magnetic field detected by the detection element 31 .

[0107] Variation example.

[0108] Figure 8 1A is a cross-sectional view showing a tensile member inspection apparatus 1A according to a modification of Embodiment 1. The tensile member inspection apparatus 1A according to the modification differs from the tensile member inspection apparatus 1 according to Embodiment 1 in the structure of the magnetic body 24 of the demagnetization / magnetization device 2A.

[0109] The magnetic body 24 includes a first magnetic pole portion 24a facing the movable handrail 6 and a second magnetic pole portion 24b facing the opposite side. The coil 22 is wound around the magnetic body 24, with the winding axis direction being the Z direction.

[0110] When 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 cable 61 of the movable handrail 6 is positioned within this magnetic field. When a DC current flows through the coil 22, a DC magnetic field is generated between the magnetic pole portions 24a and 24b, which can magnetize the cable 61 of the movable handrail 6. When an AC current flows through the coil 22, an AC magnetic field is generated between the magnetic pole portions 24a and 24b, which can demagnetize the cable 61 of the movable handrail 6.

[0111] In the tensile member inspection device 1A of the modified example, the structure of the magnetic body 24 is simple, and thus the manufacturing cost can be reduced.

[0112] Implementation method 2.

[0113] Figure 9 (A) is a cross-sectional view showing a tensile member inspection device 1B according to Embodiment 2. In Embodiment 2, a magnetizer 2B ( Figure 9 (B)) and demagnetizer 2C( Figure 9 (A) The magnetizer 2B and the demagnetizer 2C are constructed separately.

[0114] like Figure 9 As shown in (A), 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 constructed 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, the power supply 23 may only supply an alternating current for demagnetization to the coil 22. Alternatively, a power supply 23 may be provided in the housing 25. Figure 2 The roller 26 shown is the same roller.

[0115] like Figure 9As shown in Figure 2B, the magnetizer 2B includes a permanent magnet 27 and a housing 28. The permanent magnet 27 includes a first magnetic pole portion 27a and a second magnetic pole portion 27b that oppose 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.

[0116] Here, 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 polarity may be reversed. The cable 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.

[0117] The housing 28 is an outer shell of the magnetizer 2B, and houses the permanent magnet 27 inside the housing 28. Alternatively, a roller similar to the roller 26 may be provided in the housing 28.

[0118] In the second embodiment, since the magnetizer 2B and the demagnetizer 2C are provided separately, the user can select one of the magnetizer 2B and the demagnetizer 2C according to the type of the movable handrail 6 to be inspected, and use it in combination with the sensor unit 3 .

[0119] like Figure 9 As shown in Figure (A), when the overlap distance A of the cable 61 is negative, the demagnetizer 2C and the sensor unit 3 form a tensile member inspection device 1B. In this case, the tensile member inspection device 1B operates in the first operating mode. Specifically, the demagnetizer 2C applies an AC current to the coil 22, applying an AC magnetic field to the cable 61 via the magnetic body 21, thereby demagnetizing the cable 61. In the sensor unit 3, the detection magnetic field generated by the detection magnet 32 ​​is detected by the detection element 31.

[0120] like Figure 9 As shown in Figure (B), when the overlap distance A of the cable 61 is positive, the magnetizer 2B and the sensor unit 3 form the tensile member inspection device 1B. In this case, the tensile member inspection device 1B operates in the second operating mode. In the demagnetizer 2C, the cable 61 is magnetized by the magnetic field of the permanent magnet 27. In the sensor unit 3, the detection element 31 detects changes in the magnetic field using the combined magnetic field of the detection magnet 32 ​​and the magnetic field generated by the residual magnetization within the cable 61.

[0121] For example, if the method is to use only the cables 61 with a negative overlap distance A, then Figure 9 As shown in (A), only the tensile member inspection device 1B including the demagnetizer 2C and the sensor unit 3 is used. Therefore, the cost required for the inspection can be reduced.

[0122] The tensile-resistant body inspection device 1B according to the second embodiment is configured similarly to the tensile-resistant body inspection device 1 according to the first embodiment except for the above-described points.

[0123] As described above, in embodiment 2, the magnetizer 2B and the demagnetizer 2C are provided separately. Therefore, one of the magnetizer 2B and the demagnetizer 2C can be selected according to the type of the movable handrail 6 to be inspected, and can be combined with the sensor unit 3 to be used as the tensile body inspection device 1B.

[0124] Implementation method 3.

[0125] Figure 10 This is a perspective view showing a tensile body inspection device 1C according to a third embodiment. Figure 11 1C is a cross-sectional view showing a tensile member inspection device 1C according to Embodiment 3. In the tensile member inspection device 1C according to Embodiment 3, the demagnetization / magnetization device 20 and the magnetic sensor 30 are housed in a common housing 50 to form a single unit.

[0126] The housing 50 is the outer shell of the tensile member inspection device 1C, and houses 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 movable handrail 6 side of the housing 50.

[0127] The demagnetization / magnetization device 20 is configured similarly to the demagnetization / magnetization device 20 of the first embodiment, but is surrounded by the housing 50. Therefore, the housing 25 may not be provided. Figure 2 ) The magnetic sensor 30 is configured similarly to the magnetic sensor 30 of the first embodiment.

[0128] In the third embodiment, the demagnetization / magnetization device 20, the magnetic sensor 30, the signal processing circuit 33, and the housing 50 that accommodates them constitute the tensile member inspection unit 5. Since both the demagnetization / magnetization device 20 and the magnetic sensor 30 are mounted on the tensile member inspection unit 5, during inspection, the tensile member inspection unit 5 only needs to be moved relative to the movable handrail 6 in the +Y direction.

[0129] The tensile-resistant body inspection device 1C according to the third embodiment is configured similarly to the tensile-resistant body inspection device 1 according to the first embodiment except for the above-described points.

[0130] As described above, in the third embodiment, the demagnetizer / magnetizer 20 and the magnetic sensor 30 are housed in the common housing 50 and constitute one tensile member inspection unit 5 . This simplifies the handling of the tensile member inspection device 1C during inspection.

[0131] In the first to third embodiments, the tensile member to be inspected is described as the cable 61 of the moving handrail 6 of a passenger conveyor. However, as described below, other tensile members can also be inspected. The following describes the inspection of various tensile members using the tensile member inspection device 1 of the first embodiment.

[0132] <Inspection with rope>

[0133] Figure 12 This 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.

[0134] The power transmission belt 7 is annular and has a rectangular cross section in a plane perpendicular to its extension direction. The width direction of the power transmission belt 7 is defined as the X direction, the extension direction of the power transmission belt 7 is defined as the Y direction, and the direction perpendicular to the X and Y directions is defined as the Z direction.

[0135] The power transmission belt 7 includes a resin base 72 and a belt cord 71 as a tension member disposed within the base 72. The belt cord 71 is formed by twisting together metal wires. The belt cords 71 ​​extend in the Y direction, with multiple belt cords arranged in the X direction.

[0136] When inspecting the belt rope 71, the demagnetizer / magnetizer 2 and the sensor unit 3 are relatively moved in the +Y direction, which is along the extension direction of the belt rope 71. The demagnetizer / magnetizer 2 is positioned in front of the relative movement direction, i.e., in the +Y direction. Furthermore, the longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is transverse to the belt rope 71, i.e., in the X direction. The detection element 31 is positioned opposite the object, i.e., the power transmission belt 7, which includes the belt rope 71 as a tension member, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the power transmission belt 7, which is the object.

[0137] Since the belt rope 71 is looped, the overlap distance may be negative in some cases, similar to the cable 61 of the moving handrail 6 (see Figure 6 ) and the case where the overlap distance is positive (refer to Figure 7 ).

[0138] When the overlap distance of the ribbon cord 71 is negative, the tensile member inspection device 1 operates in the first operating mode, demagnetizing the ribbon cord 71 using the demagnetizer / magnetizer 2. When the overlap distance of the ribbon cord 71 is positive, the tensile member inspection device 1 operates in the second operating mode, magnetizing the ribbon cord 71 using the demagnetizer / magnetizer 2. The tensile member inspection device 1 detects defects in the ribbon cord 71 based on the magnetic field detected by the magnetic sensor 30.

[0139] <Tire Carcass Inspection>

[0140] Figure 13 and Figure 14 The figures are a perspective view and a cross-sectional view showing a method of inspecting a carcass 81 of a tire 8. The tire 8 is, for example, a radial tire.

[0141] The tire 8 includes a rubber base 80, a plurality of carcasses 81 forming the skeleton of the tire 8, a belt 82 serving as a reinforcing belt, and a pair of beads 83 ( Figure 14 ).

[0142] The carcass 81 is circumferentially aligned with the tire 8 ( Figure 13 The tire 8 is formed into a U-shaped section (indicated by arrow R in FIG). Furthermore, the carcass 81 has two end portions 81a on the inner circumference of the tire 8. The belt 82 extends circumferentially along the outer circumference of the tire 8. The beads 83 are connected to the end portions 81a of the carcass 81 and extend circumferentially along the inner circumference of the tire 8.

[0143] The carcass 81 is formed by twisting together wire rods, for example, which are metal wires. The belt 82 is formed by, for example, a metal belt formed into a cylindrical shape. The beads 83 are formed by bundling wire rods, for example, which are metal wires.

[0144] exist Figure 13 and Figure 14 In the figure, the extension direction of the carcass 81 of the tensile body to be inspected is set to the Y direction, the width direction of the carcass 81 (i.e., the circumferential direction of the tire 8) is set to the X direction, and the direction perpendicular to the X and Y directions is set to the Z direction.

[0145] When inspecting the tire carcass 81, the demagnetizer / magnetizer 2 and sensor unit 3 are relatively moved in the +Y direction, which is along the extension direction of the tire carcass 81. The demagnetizer / magnetizer 2 is positioned forward of the relative movement direction, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and sensor unit 3 is oriented transversely to the tire carcass 81, i.e., in the X direction. The detection element 31 is positioned opposite the tire 8, an object including the tire carcass 81 as a tensile member, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the tire 8, the object.

[0146] In addition, Figure 13 and Figure 14 , a control device 15 is also shown together with the demagnetization / magnetization device 2 and the sensor unit 3 . The control device 15 may also be arranged at a position away from the demagnetization / magnetization device 2 and the sensor unit 3 .

[0147] When the detection element 31 of the sensor unit 3 is aligned with the end portion 81a ( Figure 14), a strong magnetic field may act on the detection element 31. Therefore, when inspecting the tire carcass 81, the tensile member inspection device 1 operates in the first operating mode, demagnetizing the tire carcass 81 using the demagnetizer / magnetizer 2. The tensile member inspection device 1 detects defects in the tire carcass 81 based on the magnetic field detected by the magnetic sensor 30.

[0148] <Inspection of tire belt>

[0149] Figure 15 and Figure 16 The structure of the tire 8 is shown in the perspective view and the cross-sectional view. Figure 13 and Figure 14 As described. Figure 15 and Figure 16 In the example shown, the demagnetizer / magnetizer 2 and the sensor unit 3 are placed opposite to the side surface of the tire 8 .

[0150] exist Figure 15 and Figure 16 In the figure, the extending direction of the belt 82 of the tensile body to be inspected (i.e., the circumferential direction of the tire 8) is set as the Y direction, the direction across the belt 82 (i.e., the radial direction of the tire 8) is set as the X direction, and the direction perpendicular to the X and Y directions is set as the Z direction.

[0151] When inspecting the belt 82, the demagnetizer / magnetizer 2 and the sensor unit 3 are relatively moved in the +Y direction, along the extending direction of the belt 82. The demagnetizer / magnetizer 2 is positioned in front of the relative movement direction, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is oriented transversely to the belt 82, i.e., in the X direction. The detection element 31 is positioned opposite the tire 8, an object containing the belt 82 as a tensile member, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the tire 8, serving as the object.

[0152] In addition, Figure 15 , a control device 15 is also shown together with the demagnetization / magnetization device 2 and the sensor unit 3 . The control device 15 may also be arranged at a position away from the demagnetization / magnetization device 2 and the sensor unit 3 .

[0153] Since the belt 82 is annular, the overlap distance may be negative in some cases, similar to the rope 61 of the moving handrail 6 (see Figure 6 ) and the case where the overlap distance is positive (refer to Figure 7 ).

[0154] When the overlap distance A of the belt 82 is negative, the tensile member inspection device 1 operates in a first operating mode, demagnetizing the belt 82 using the demagnetizer / magnetizer 2. When the overlap distance A of the belt 82 is positive, the tensile member inspection device 1 operates in a second operating mode, magnetizing the belt 82 using the demagnetizer / magnetizer 2. The tensile member inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30.

[0155] Figure 17 1 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. Figure 17 In the illustrated example, the demagnetizer / magnetizer 2 and the sensor unit 3 are arranged to face the inner peripheral surface of the tire 8 .

[0156] exist Figure 17 In the figure, the extension direction of the belt 82 of the tensile body to be inspected (i.e., the width direction of the tire 8) is set as the Y direction, the width direction of the belt 82 (i.e., the circumferential direction of the tire 8) is set as the X direction, and the direction perpendicular to the X and Y directions is set as the Z direction.

[0157] When inspecting the tape 82, the demagnetizer / magnetizer 2 and the sensor unit 3 are relatively moved in the +Y direction, which is along the extending direction of the tape 82. The demagnetizer / magnetizer 2 is positioned forward of the relative movement direction, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is set to be the direction that crosses the tape 82, i.e., in the X direction.

[0158] Regarding the first and second action modes of the tensile testing device 1, as shown in FIG. Figure 15 and Figure 16 As described above, the tensile member inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30 .

[0159] exist Figure 17 In the example shown, the opposing area ratio of the demagnetizer / magnetizer 2 and the sensor unit 3 to the belt 82 can be made Figure 15 and Figure 16 The example shown is large, so the detection accuracy can be further improved.

[0160] Figure 18 8 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. Figure 18 In the illustrated example, the demagnetizer / magnetizer 2 and the sensor unit 3 are arranged to face the outer peripheral surface of the tire 8 .

[0161] When inspecting the belt 82, the demagnetizer / magnetizer 2 and the sensor unit 3 are relatively moved in the +Y direction, which is along the extending direction of the belt 82. The demagnetizer / magnetizer 2 is positioned in front of the relative movement direction, i.e., in the +Y direction. The longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is the direction transverse to the belt 82, i.e., in the X direction.

[0162] Regarding the first and second action modes of the tensile testing device 1, as shown in FIG. Figure 15 and Figure 16 As described above, the tensile member inspection device 1 detects defects in the belt 82 based on the magnetic field detected by the magnetic sensor 30 .

[0163] exist Figure 18 In the example shown, since the demagnetizer / magnetizer 2 and the sensor unit 3 are opposite to the outer peripheral surface of the tire 8, Figure 17 Compared with the example shown, the length of the demagnetization / magnetization device 2 and the sensor unit 3 can be increased. Therefore, the facing area of ​​the demagnetization / magnetization device 2 and the sensor unit 3 and the belt 82 can be further increased, and the detection accuracy can be further improved.

[0164] <Inspection of steel bars in concrete structures>

[0165] Figure 19 This is a perspective view illustrating a method for inspecting steel bars 91 of a concrete structure 9. Concrete structure 9 is, for example, reinforced concrete. Concrete structure 9 comprises concrete 90, and a plurality of steel bars 91 and 92 disposed within concrete 90. Steel bars 91 and 92 are disposed perpendicular to each other. Steel bars 91 and 92 are, for example, round steel bars.

[0166] The extending direction of the reinforcing bar 91 is the Y direction, the extending direction of the reinforcing bar 92 is the X direction, and the direction perpendicular to the X and Y directions is the Z direction. The plurality of reinforcing bars 91 are arranged in the X direction, and the plurality of reinforcing bars 92 are arranged in the Y direction.

[0167] When inspecting a rebar 91 using the tensile member inspection device 1, the demagnetizer / magnetizer 2 and the sensor unit 3 are relatively moved in the +Y direction, along the extension direction of the rebar 91. The demagnetizer / magnetizer 2 is positioned forward of the relative movement direction, i.e., in the +Y direction. Furthermore, the longitudinal direction of the demagnetizer / magnetizer 2 and the sensor unit 3 is oriented transversely to the rebar 91, i.e., in the X direction. The detection element 31 faces the concrete structure 9, an object including the tensile members 91 and 92, and detects the magnetic field. The detection magnet 32 ​​generates a magnetic field that acts on the concrete structure 9, the object.

[0168] In a large concrete structure 9, a plurality of reinforcing bars 91 are sometimes used in combination along the longitudinal direction, so there is a case where the overlap distance is negative (see Figure 6 ) and the case where the overlap distance is positive (refer to Figure 7 ).

[0169] When the overlap distance A of the steel bar 91 is negative, the tensile member inspection device 1 operates in a first operating mode, demagnetizing the steel bar 91 using the demagnetizer / magnetizer 2. When the overlap distance A of the steel bar 91 is positive, the tensile member inspection device 1 operates in a second operating mode, magnetizing the steel bar 91 using the demagnetizer / magnetizer 2. The tensile member inspection device 1 detects defects in the steel bar 91 based on the magnetic field detected by the magnetic sensor 30.

[0170] Furthermore, by changing the orientation of the tensile member inspection device 1 and relatively moving the demagnetization / magnetization device 2 and the sensor unit 3 in the extending direction of the reinforcing bar 92 , the reinforcing bar 92 can also be inspected.

[0171] Here, the concrete structure 9 is described as reinforced concrete and the tensile members are the steel bars 91 and 92. However, the concrete structure 9 may be a PC (prestressed concrete) steel material and the tensile members may be a steel material such as PC steel material.

[0172] exist Figures 12-19 In the example shown, an example of inspecting various tensile members using the tensile member inspection device 1 of embodiment 1 is described, but the invention is not limited to the tensile member inspection device 1 of embodiment 1, and the tensile member inspection devices 1A, 1B, and 1C of the modified example, embodiment 2, or embodiment 3 may also be used.

[0173] Furthermore, the tensile member inspection apparatuses 1, 1A, 1B, and 1C of the first to third embodiments and their modified examples can be used for inspection of tensile members other than the aforementioned cables, carcasses, belts, and reinforcing bars.

[0174] As mentioned above, although the preferred embodiment was specifically described, this disclosure is not limited to the above-mentioned embodiment, and various improvements and modifications can be made.

[0175] Description of labels

[0176] 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 supply; 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: cable (tensile body); 71: belt rope (tensile body); 81: carcass (tensile body); 82: belt (tensile body); 91, 92: steel bar (tensile body).

Claims

1. A tensile testing device, characterized in that: The tensile testing device includes a magnetic sensor and a demagnetizer. The magnetic sensor has: a detection element that is opposed to the object including the tension body and detects a magnetic field; and a detection magnet that generates a magnetic field acting on the object, The demagnetizer faces the object at a position away from the magnetic sensor in the extending direction of the tension member, and demagnetizes the tension member.

2. The tensile testing device according to claim 1, characterized in that: The tensile member inspection device further includes a magnetizer that faces the object at a position separated from the magnetic sensor in the extending direction of the tensile member and magnetizes the tensile member.

3. The tensile testing device according to claim 2, characterized in that: The demagnetizer and the magnetizer are integrally formed.

4. The tensile testing device according to claim 3, characterized in that: The tensile body inspection device comprises: a first action mode, in which the demagnetizer demagnetizes the anti-tension body; and A second operating mode is a mode in which the tension member is magnetized by the magnetizer.

5. The tensile testing device according to claim 4, characterized in that: When the tension member has a gap in the extending direction, the first action mode is executed. When the tension member has an overlapping portion in the extending direction, the second operation mode is executed.

6. The tensile body inspection device according to claim 4 or 5, characterized in that: In the first operation mode, an alternating magnetic field is applied from the demagnetizer to the tension member. In the second operation mode, a DC magnetic field is applied from the magnetizer to the tension member.

7. The tensile testing device according to claim 6, characterized in that: The demagnetizer includes a magnetic body facing the object, a coil wound around the magnetic body, and a power source for passing current through the coil. In the first operation mode, an alternating current is supplied from the power supply to the coil.

8. The tensile body inspection device according to claim 6 or 7, characterized in that: The magnetizer includes a magnetic body facing the object, a coil wound around the magnetic body, and a power source for passing current through the coil. In the second operation mode, a direct current is supplied from the power supply to the coil.

9. The tensile body inspection device according to claim 7 or 8, characterized in that: The magnetic body has a first magnetic pole portion and a second magnetic pole portion, and the first magnetic pole portion and the second magnetic pole portion are opposed to each other in the extending direction of the tension member.

10. The tensile body inspection device according to claim 7 or 8, characterized in that: The magnetic body includes a first magnetic pole portion facing the tension member and a second magnetic pole portion facing the opposite side.

11. The tensile body inspection device according to any one of claims 2 to 10, characterized in that: The demagnetizer and the magnetizer are constructed separately.

12. The tensile body inspection device according to any one of claims 2 to 10, characterized in that: The magnetizer, the demagnetizer, and the magnetic sensor are mounted on a common housing.

13. The tensile body inspection device according to any one of claims 1 to 12, characterized in that: The tensile member inspection device further includes a processing circuit configured to process an output of the detection element.

14. The tensile body inspection device according to any one of claims 1 to 13, characterized in that: The object is a moving handrail of a passenger conveyor, The tensile body is the cable of the moving handrail.

15. The tensile body inspection device according to any one of claims 1 to 13, characterized in that: The object is a power transmission belt, The tension body is the cable of the power transmission belt.

16. The tensile body inspection device according to any one of claims 1 to 13, characterized in that: The object is a tire, The tensile body is the carcass or belt of the tire.

17. The tensile body inspection device according to any one of claims 1 to 13, characterized in that: The object is a concrete structure, The tensile body is the steel bar or steel material of the concrete structure.

Images