Tensile body inspection device

Abstract

A tensile body inspection device (1) is provided with: a plurality of magnetic sensors (20, 30) which are provided so as to face an object (6) including a tensile body (61), are capable of relative movement with respect to the object (6) in the direction of extension of the tensile body (61), and are arranged at a distance (D) in the direction of the relative movement; and processing devices (12, 15) for synthesizing the output waveforms of the plurality of magnetic sensors (20, 30) by shifting the output waveforms by a time ([Delta] T) obtained by dividing the interval (D) by the speed of the relative movement, and detecting the defect of the tensile body (61) on the basis of the synthesized waveform.

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 have cables built into them as tensile members. Cables are made, for example, by twisting together wires. The wires in cables can sometimes break due to fatigue.

[0003] For example, as a technology for detecting cable breaks, a technique has been developed that uses a magnet to strongly magnetize the cable and then uses a coil to detect the leakage magnetic flux leaking from the broken portion of the cable (see, for example, Patent Documents 1 and 2). Furthermore, an inspection device has been developed that uses a magnetic sensor to detect cable breakage caused by cable breakage (see, for example, Patent Document 3).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2022-70599 (see Figure 3 (A), (B)

[0007] Patent Document 2: International Publication WO2007 / 116884 (refer to Figure 3 )

[0008] Patent Document 3: Japanese Patent No. 7020564 (refer to Figure 4 ) Summary of the Invention

[0009] Problems to be solved by the invention

[0010] However, the moving handrail of the passenger conveyor may vibrate during the inspection of the cable. When the moving handrail vibrates, the distance between the cable and the magnetic sensor changes, affecting the detection results.

[0011] 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 that suppresses the influence of vibration and has high detection accuracy.

[0012] Means for solving problems

[0013] The tensile body inspection device disclosed herein comprises: a plurality of magnetic sensors, which are arranged to be opposite to an object containing the tensile body and can move relative to the object in the extension direction of the tensile body, and the plurality of magnetic sensors are arranged at intervals in the direction of the relative movement; and a processing device, which synthesizes the output waveforms of the plurality of magnetic sensors by a time obtained by dividing the interval by the speed of relative movement, and detects defects in the tensile body based on the synthesized waveform.

[0014] Effects of the Invention

[0015] The tensile member inspection device of the present disclosure combines the output waveforms of a plurality of magnetic sensors by shifting them by a time obtained by dividing the interval between the sensors by the relative movement speed. This eliminates the influence of vibration and enables accurate defect detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a perspective view showing the tensile body inspection device according to the first embodiment.

[0017] Figure 2 This is a cross-sectional view showing the tensile body inspection device according to the first embodiment.

[0018] Figure 3 This is a schematic diagram illustrating the detection principle of the magnetic sensor according to the first embodiment.

[0019] Figure 4 (A) and (B) show the output waveform of the first magnetic sensor and the output waveform of the second magnetic sensor in Embodiment 1.

[0020] Figure 5 (A) and (B) show the output waveform of the first magnetic sensor and the output waveform of the second magnetic sensor after offset processing according to the first embodiment.

[0021] Figure 6 This is a diagram showing a synthesized waveform obtained by synthesizing the output waveform of the first magnetic sensor and the processed output waveform of the second magnetic sensor according to the first embodiment.

[0022] Figure 7 This is a perspective view showing a tensile body inspection device according to a second embodiment.

[0023] Figure 8 This is a cross-sectional view showing a tensile body inspection device according to a second embodiment.

[0024] Figure 9 This is a cross-sectional view showing a tensile body inspection device according to a third embodiment.

[0025] Figure 10 This is a cross-sectional view showing a tensile body inspection device according to a fourth embodiment.

[0026] Figure 11 This is a cross-sectional view showing a tensile body inspection device according to a fifth embodiment.

[0027] Figure 12 This is a cross-sectional view showing a control system of the tensile body inspection device according to the fifth embodiment.

[0028] Figure 13 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.

[0029] Figure 14 This 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.

[0030] Figure 15 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.

[0031] Figure 16 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.

[0032] Figure 17 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.

[0033] 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.

[0034] Figure 19 This is a cross-sectional view showing another example of using the tensile member inspection device of the first embodiment for tire belt inspection.

[0035] Figure 20 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

[0036] 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.

[0037] Implementation method 1.

[0038] <Structure of the tensile body inspection device 1>

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 in the width direction inside the flat portion 62a of the base 62. The cables 61 are also annular like the base 62.

[0043] 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.

[0044] The tensile member inspection device 1 is disposed so as to face the flat portion 62a of the movable handrail 6. The tensile member inspection device 1 includes a first magnetic sensor 20, a second magnetic sensor 30, a signal processing circuit 12, and a housing 11 that accommodates these.

[0045] The first magnetic sensor 20 and the second magnetic sensor 30 as a plurality of magnetic sensors are arranged to face the movable handrail 6 which is an object including the cable 61 as a tension-resistant body, and can move relative to the movable handrail 6 in the extending direction of the cable 61 (ie, the Y direction).

[0046] The first magnetic sensor 20 and the second magnetic sensor 30 are arranged in the Y direction with a distance D therebetween. The distance D is also referred to as the inter-sensor distance. The first magnetic sensor 20 and the second magnetic sensor 30 are formed to be long in the direction crossing the movable handrail 6, that is, in the X direction.

[0047] like Figure 2 As shown, the housing 11 is movable relative to the moving handrail 6 in the direction in which the cable 61 extends (i.e., the Y direction). Here, the direction in which the housing 11 moves relative to the moving handrail 6 is defined as the +Y direction. Furthermore, the speed at which the housing 11 moves relative to the moving handrail 6 is defined as the relative movement speed V.

[0048] The housing 11 can be moved in the +Y direction by the driving force of a dedicated motor, or the movable handrail 6 can be moved in the -Y direction while the position of the housing 11 is fixed. If the movable handrail 6 is moved in the -Y direction, the existing drive source of the escalator or moving walkway can be utilized, so there is no need to provide a dedicated motor.

[0049] Here, the first magnetic sensor 20 is arranged in front of the housing 11 in the relative movement direction relative to the movable handrail 6 (ie, +Y direction), and the second magnetic sensor 30 is arranged in the rear (ie, -Y direction).

[0050] The first magnetic sensor 20 includes a detection element 21 disposed to face the movable handrail 6 , and a detection magnet 22 disposed on the opposite side of the movable handrail 6 (here, in the +Z direction) across the detection element 21 .

[0051] The detection element 21 and the detection magnet 22 of the first magnetic sensor 20 extend in the direction crossing the movable handrail 6, that is, in the X direction. The length of the detection element 21 and the detection magnet 22 in the X direction is preferably the same as the flat portion 62a ( Figure 1 ) is greater than the width of the

[0052] Detection element 21 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 21 detects changes in the magnetic field.

[0053] The detection magnet 22 is composed of, for example, a permanent magnet. The detection magnet 22 has an N pole on the side of the movable handrail 6 and an S pole on the opposite side. The detection element 21 is located between the detection magnet 22 and the movable handrail 6. The detection magnet 22 generates a magnetic field (described later as the detection magnetic field F) that acts on the movable handrail 6. Alternatively, the detection magnet 22 may be an electromagnet.

[0054] The second magnetic sensor 30 includes a detection element 31 disposed opposite the movable handrail 6 and a detection magnet 32 ​​disposed on the opposite side of the movable handrail 6 (in this case, the +Z direction) across the detection element 31. The detection element 31 is configured similarly to the detection element 21 of the first magnetic sensor 20, and the detection magnet 32 ​​is configured similarly to the detection magnet 22 of the first magnetic sensor 20.

[0055] A pair of rollers 13 are provided at both ends of the housing 11, for example, in the Y direction. These rollers 13 abut against the movable handrail 6. These rollers 13 maintain a constant distance between the detection elements 21 and 31 of the first and second magnetic sensors 20 and 30 and the movable handrail 6. In other words, the rollers 13 function as distance-maintaining members.

[0056] The signal processing circuit 12 is connected to the cable 102 ( Figure 1) is connected to the detection element 21 and is connected to the detection element 21 via the cable 103 ( Figure 1 ) is connected to the detection element 31. In addition, the signal processing circuit 12 is connected to the control device 15 through the lead 14.

[0057] The signal processing circuit 12 receives the output signals of the detection element 21 of the first magnetic sensor 20 and the detection element 31 of the second magnetic sensor 30 and transmits them to the control device 15. The signal processing circuit 12 does not need to be housed in the housing 11; it can be located in a position where it can detect the output signals of the detection elements 21 and 31.

[0058] The control device 15 is a computer or the like installed outside the tensile testing device 1. The control device 15 includes a CPU (Central Processing Unit), a storage device such as a memory, a display for displaying information, and an input unit for user input. The control device 15 can be located remotely from the housing 11.

[0059] <Defect Detection Principle of the First Magnetic Sensor 20 and the Second Magnetic Sensor 30>

[0060] Figure 3 This is a schematic diagram illustrating the principle of detecting defects in cable 61 using first magnetic sensor 20. Detection magnet 22 is positioned with its north pole 22a facing toward movable handrail 6 and its south pole 22b facing the opposite side. Detection element 21 is positioned between north pole 22a of detection magnet 22 and movable handrail 6.

[0061] The magnetic flux from the north pole 22a of the detection magnet 22 returns to the south pole 22b of the detection magnet 22. That is, the detection magnet 22 generates a detection magnetic field F. The detection element 21 and the moving handrail 6 are located in this detection magnetic field F. Therefore, if the cable 61 of the moving handrail 6 is not defective, the detection element 21 will always detect a constant magnetic field.

[0062] 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, the wire 61c protrudes onto the surface of the moving handrail 6, causing a change in the detection magnetic field F acting on the detection element 21. The detection element 21 detects this change. The output signal of the detection element 21 is sent to the signal processing circuit 12.

[0063] The detection principle of the second magnetic sensor 30 is also the same as the detection principle of the first magnetic sensor 20 .

[0064] <Processing of Output Signals of the First and Second Magnetic Sensors 20 and 30>

[0065] Figure 4(A) is a diagram showing the output waveform of the first magnetic sensor 20, Figure 4 (B) is a diagram showing the output waveform of the second magnetic sensor 30 . Figure 4 The vertical axis of (A) represents the output voltage of the first magnetic sensor 20, and the horizontal axis represents time T. Similarly, Figure 4 In (B), the vertical axis represents the output voltage of the second magnetic sensor 30 , and the horizontal axis represents time T.

[0066] like Figure 4 As shown in (A), the output waveform of the first magnetic sensor 20 fluctuates between positive and negative values ​​around time T0 when the first magnetic sensor 20 passes through the open portion of the wire 61c of the cable 61. The fluctuation in the output waveform caused by the open portion of the wire 61c of the cable 61 is referred to as the open component B1.

[0067] The movable handrail 6 may have uneven surfaces during manufacture or use, and vibrations may occur at these uneven surfaces during inspection of the cable 61. When the vibration occurs, the output waveform of the first magnetic sensor 20 fluctuates around time T1. The portion of the output waveform that fluctuates due to the vibration of the movable handrail 6 is referred to as vibration component B2.

[0068] like Figure 4 As shown in (B), the output waveform of the second magnetic sensor 30 fluctuates between positive and negative around time T2 when the second magnetic sensor 30 passes through the open wire portion of the wire 61c of the cable 61. That is, an open wire component B1 appears around time T2.

[0069] The time T1 ( Figure 4 The difference ΔT between (A) and the time T2 when the second magnetic sensor 30 passes through the open line portion corresponds to the value obtained by dividing the distance D between the magnetic sensors 20 and 30 by the relative movement speed V of the housing 11 relative to the moving handrail 6 (ΔT=D / V).

[0070] Meanwhile, the vibration of the moving handrail 6 is detected simultaneously by the first magnetic sensor 20 and the second magnetic sensor 30. Therefore, the output waveform of the second magnetic sensor 30 fluctuates around time T1, similar to the output waveform of the first magnetic sensor 20. In other words, a vibration component B2 appears around time T1.

[0071] The signal processing circuit 12 of the tensile member inspection device 1 according to the first embodiment performs offset processing on the output waveform of the second magnetic sensor 30 and then combines the output waveform of the first magnetic sensor 20 and the output waveform of the second magnetic sensor 30. This will be described below.

[0072] Figure 5 (A) is shown Figure 4(A) is a diagram showing an output waveform of the first magnetic sensor 20 . Figure 5 (B) is a diagram showing Figure 4 (B) is a diagram showing a waveform of the output waveform of the second magnetic sensor 30 after processing to shift the output waveform by -ΔT.

[0073] exist Figure 5 In the waveform after offset processing (B), Figure 5 (A) Similarly, a wire break component B1 caused by the wire 61 c of the cable 61 breaking appears around time T0.

[0074] In the waveform after the offset process, the fluctuation caused by the vibration of the moving handrail 6 is also offset by -ΔT, so the vibration component B2 caused by the vibration appears before and after the time T1-ΔT. In other words, Figure 5 The vibration component B2 in the output waveform of (B) is Figure 5 The vibration component B2 in the output waveform of (A) appears earlier by ΔT.

[0075] Figure 6 is an output waveform of the first magnetic sensor 20 ( Figure 5 (A)) Output waveform of the second magnetic sensor 30 after offset processing ( Figure 5 (B)) A diagram of a synthesized waveform after synthesis. The synthesis method is preferably addition, multiplication, or cross-correlation.

[0076] In the output waveform of the first magnetic sensor 20 ( Figure 5 (A)) Output waveform of the second magnetic sensor 30 after offset processing ( Figure 5 In (B), the open line component B1 is generated at the same time T0. Therefore, Figure 6 In the synthesized waveform, the open-line component B1 is amplified.

[0077] In contrast, in the output waveform of the first magnetic sensor 20 ( Figure 5 (A)) Output waveform of the second magnetic sensor 30 after offset processing ( Figure 5 In (B), the vibration component B2 is generated at a different time. Figure 6 In the synthesized waveform, the vibration component B2 is not amplified and remains dispersed.

[0078] That is, in Figure 6 In the synthesized waveform, the open wire component B1 is amplified, but the vibration component B2 is not amplified. Therefore, the difference in amplitude between the open wire component B1 and the vibration component B2 becomes larger. Therefore, the presence of open wires in the wire 61c of the cable 61 can be determined based on the open wire component B1, eliminating the influence of vibration.

[0079] The vibration component B2 in the synthesized waveform can be removed by, for example, cutting off components with amplitudes smaller than a predetermined value. If the vibration component B2 is removed, the presence of a broken wire in the wire 61c of the cable 61 can be determined more accurately based on the broken wire component B1.

[0080] When the signal processing circuit 12 detects a break in the wire 61c of the cable 61 based on the synthesized waveform, it transmits a defect detection signal to the control device 15. Based on the defect detection signal from the signal processing circuit 12, the control device 15 displays a message on the display unit indicating that a defect in the cable 61 has been detected.

[0081] In addition, although the signal processing circuit 12 is described here as performing the shifting and combining of the output waveforms and the defect detection based on the shifting and combining, these processes may be performed by the control device 15. That is, the signal processing circuit 12 and the control device 15 constitute a processing device.

[0082] The distance D between the first magnetic sensor 20 and the second magnetic sensor 30 is preferably longer than the length obtained by multiplying the vibration period of the moving handrail 6 by the relative movement speed V. This prevents the vibration components B2 from overlapping when the output waveform of the first magnetic sensor 20 and the offset output waveform of the second magnetic sensor 30 are synthesized. This effectively eliminates the effects of vibration.

[0083] The vibration period of the moving handrail 6 can be calculated based on the shape of the moving handrail 6 and the occurrence of irregularities during manufacture or use.

[0084] As described above, as the output waveforms ( Figure 5 (A) and (B)) are synthesized to obtain the synthesized waveform ( Figure 6 ) method, preferably addition processing, multiplication processing or cross-correlation processing.

[0085] When using addition or multiplication, the vibration component B2 in the synthesized waveform can be made sufficiently smaller than the open-line component B1, effectively eliminating the influence of vibration. When using cross-correlation, the vibration component B2 can be further reduced relative to the open-line component B1, further effectively eliminating the influence of vibration.

[0086] Here, an example is described in which the output waveform of the first magnetic sensor 20 and the output waveform of the second magnetic sensor 30 are offset by -ΔT. However, the output waveform of the first magnetic sensor 20 may be offset by +ΔT.

[0087] While this example describes synthesizing the output waveforms of two magnetic sensors 20 and 30, it is also possible to synthesize the output waveforms of three or more magnetic sensors. For example, if three magnetic sensors are arranged at a constant interval D, the output waveform of the first magnetic sensor in the +Y direction, the waveform of the output waveform of the second magnetic sensor offset by -ΔT (= D / V), and the waveform of the output waveform of the third magnetic sensor offset by -2×ΔT (= 2×D / V) can be synthesized.

[0088] <Effects of Implementation Method 1>

[0089] As described above, the anti-tension body inspection device 1 of embodiment 1 includes: a first magnetic sensor 20 and a second magnetic sensor 30, which are arranged to be opposite to the movable handrail 6 (i.e., the object) including the cable 61 (i.e., the anti-tension body), and move relative to the movable handrail 6 in the extension direction of the cable 61, and the first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D between them in the direction of the relative movement; and a signal processing circuit 12 or a control device 15 (i.e., a processing device), which synthesizes the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30 by the time ΔT obtained by dividing the offset interval D by the relative movement speed V, and detects defects in the cable 61 based on the synthesized waveform.

[0090] In this manner, by offsetting and combining the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30 , the influence of vibration can be suppressed, and the breakage of the wire 61 c of the cable 61 can be detected with high accuracy.

[0091] In addition, by making the interval D between the first magnetic sensor 20 and the second magnetic sensor 30 longer than the length obtained by multiplying the vibration period of the movable armrest 6 by the relative moving speed V, the vibration components B2 of each vibration waveform can be made non-overlapping, thereby effectively eliminating the influence of vibration.

[0092] Furthermore, by using addition or multiplication in the synthesis of the output waveforms, the vibration component B2 in the synthesized waveform can be sufficiently reduced, thereby effectively eliminating the influence of the vibration.

[0093] Furthermore, by using cross-correlation processing in the synthesis of the output waveforms, the vibration component B2 in the synthesized waveform can be further reduced, thereby more effectively eliminating the influence of vibration.

[0094] In addition, since the first magnetic sensor 20 and the second magnetic sensor 30 are housed in a common shell 11, and the shell 11 has a roller 13 for abutment, the distance between the detection elements 21, 31 and the movable armrest 6 can be kept constant, thereby improving the detection accuracy of the first magnetic sensor 20 and the second magnetic sensor 30 for the magnetic field.

[0095] Implementation method 2.

[0096] Figure 7 This is a perspective view showing a tensile member inspection apparatus 1A according to a second embodiment. Figure 8 1A is a cross-sectional view showing a tensile member inspection apparatus 1A according to Embodiment 2. The tensile member inspection apparatus 1A according to Embodiment 2 is different from the tensile member inspection apparatus 1 according to Embodiment 1 in that magnetizers 41 and 42 are provided.

[0097] like Figure 8 As shown, the magnetizer 41 is arranged in the +Y direction of the first magnetic sensor 20. The magnetizer 41 includes a permanent magnet 41a. The permanent magnet 41a has a first magnetic pole portion 411 and a second magnetic pole portion 412 that are opposed to each other in the Y direction, and a yoke portion 410 that connects these magnetic pole portions 411 and 412. The first magnetic pole portion 411 is located in the +Y direction, and the second magnetic pole portion 412 is located in the -Y direction.

[0098] Here, the first magnetic pole 411 of the permanent magnet 41a is the north pole, and the second magnetic pole 412 is the south pole. However, the polarities may be reversed. A magnetic field oriented in the -Y direction is formed between the first magnetic pole 411 and the second magnetic pole 412 of the permanent magnet 41a. This magnetic field magnetizes the cable 61 that moves the handrail 6. Magnetization of the cable 61 refers to increasing the magnetization within the cable 61.

[0099] The magnetizer 42 is positioned in the -Y direction relative to the second magnetic sensor 30. The magnetizer 42 includes a permanent magnet 42a. The permanent magnet 42a includes a first magnetic pole portion 421 and a second magnetic pole portion 422 that oppose each other in the Y direction, and a yoke portion 420 that connects the magnetic pole portions 421 and 422. The first magnetic pole portion 421 is positioned in the +Y direction, and the second magnetic pole portion 422 is positioned in the -Y direction.

[0100] Here, the first magnetic pole portion 421 of the permanent magnet 42a is the S pole, and the second magnetic pole portion 422 is the N pole, but the polarity can be reversed. A magnetic field in the opposite direction to that of the permanent magnet 41a, i.e., in the +Y direction, is formed between the first magnetic pole portion 421 and the second magnetic pole portion 422 of the permanent magnet 42a.

[0101] The permanent magnets 41a and 42a of the magnetizers 41 and 42 extend in the direction crossing the movable handrail 6, that is, in the X direction. In addition, the length of the permanent magnets 41a and 42a in the X direction is preferably equal to the flat portion 62a ( Figure 7 ) is greater than the width of the

[0102] The first magnetic sensor 20, the second magnetic sensor 30, the magnetizers 41 and 42, and the signal processing circuit 12 are housed in the housing 11. As in the first embodiment, rollers 13 are provided at both ends of the housing 11 in the Y direction, for example, to contact the movable handrail 6.

[0103] During inspection, the housing 11 is moved in the +Y direction relative to the movable handrail 6. The cable 61 is magnetized by the magnetic field of the permanent magnet 41a of the magnetizer 41.

[0104] When the first magnetic sensor 20 reaches the magnetized portion of the cable 61, the combined magnetic field of the detection magnetic field generated by the detection magnet 22 and the magnetic field generated by the residual magnetization within the cable 61 acts on the detection element 21 of the first magnetic sensor 20. If the wire 61c of the cable 61 breaks, the detection element 21 detects the change in the combined magnetic field.

[0105] Next, when the second magnetic sensor 30 reaches the magnetized portion of the cable 61, the combined magnetic field of the detection magnetic field generated by the detection magnet 32 ​​and the magnetic field generated by the residual magnetization within the cable 61 acts on the detection element 31 of the second magnetic sensor 30. If the wire 61c of the cable 61 breaks, the detection element 31 detects a change in the combined magnetic field.

[0106] In this manner, since the combined magnetic field is detected by the detection elements 21 and 31 of the first magnetic sensor 20 and the second magnetic sensor 30 , the accuracy of detecting the breakage of the wire 61 c of the cable 61 can be improved.

[0107] Since the tensile member inspection device 1A includes a magnetizer 41 in the +Y direction and a magnetizer 42 in the -Y direction relative to the magnetic sensors 20 and 30, the cable 61 can be inspected by reversing the orientation of the housing 11 of the tensile member inspection device 1A. In this case, after the cable 61 is magnetized by the permanent magnet 42a of the magnetizer 42, the magnetic field is detected by the second magnetic sensor 30 and the first magnetic sensor 20.

[0108] The tensile member inspection device 1A includes two magnetizers 41 and 42, but may also include only one of the magnetizers 41 and 42. Specifically, the magnetizer may be provided in front of the first magnetic sensor 20 and the second magnetic sensor 30 in the direction of relative movement of the housing 11 relative to the movable handrail 6 (i.e., in the +Y direction).

[0109] The tensile-resistant body inspection apparatus 1A according to the second embodiment is configured similarly to the tensile-resistant body inspection apparatus 1 according to the first embodiment except for the above-mentioned points.

[0110] As described above, in the tensile member inspection device 1A of the second embodiment, since the magnetizer 41 is provided in the +Y direction of the first magnetic sensor 20, the cable 61 can be magnetized by the magnetizer 41 before detecting the magnetic field. Consequently, the detection elements 21 and 31 of the magnetic sensors 20 and 30 can detect the combined magnetic field of the detection magnetic field generated by the detection magnets 22 and 32 and the magnetic field generated by the residual magnetization within the cable 61, thereby improving detection accuracy.

[0111] Furthermore, since the magnetizer 41 is provided in the +Y direction of the first magnetic sensor 20 and the magnetizer 42 is provided in the -Y direction of the second magnetic sensor 30 , the cable 61 can be inspected by reversing the direction of the housing 11 , thereby improving convenience.

[0112] Implementation method 3.

[0113] Figure 9 1B is a perspective view showing a tensile member inspection apparatus 1B according to Embodiment 3. The tensile member inspection apparatus 1B according to Embodiment 3 is different from the tensile member inspection apparatus 1 according to Embodiment 1 in that the apparatus 1B includes a magnetizer 50 having an electromagnet.

[0114] The magnetizer 50 is arranged in the +Y direction of the first magnetic sensor 20. The magnetizer 50 includes a magnetic body 51, a coil 52 wound around the magnetic body 51, and a power supply 53 connected to the coil 52. The magnetic body 51 and the coil 52 constitute an electromagnet.

[0115] The magnetic body 51 includes a first magnetic pole portion 511 and a second magnetic pole portion 512 facing each other in the Y direction, and a yoke portion 510 connecting these magnetic pole portions 511 and 512. The first magnetic pole portion 511 is located in the +Y direction, and the second magnetic pole portion 512 is located in the -Y direction.

[0116] The magnetic body 51 extends in the direction crossing the movable handrail 6, that is, in the X direction. The length of the magnetic body 51 in the X direction is preferably equal to the length of the flat portion 62a ( Figure 1 ) is greater than the width of the

[0117] The coil 52 is wound around the yoke portion 51c of the magnetic body 51, with the winding axis oriented in the Y direction. The power supply 53 is connected to the signal processing circuit 12 via a cable (not shown). The power supply 53 flows a DC current through the coil 52. The DC current flowing through the coil 52 generates a DC magnetic field between the first magnetic pole portion 511 and the second magnetic pole portion 512, magnetizing the cable 61 of the movable handrail 6.

[0118] The first magnetic sensor 20, the second magnetic sensor 30, the magnetizer 50, and the signal processing circuit 12 are housed in the housing 11. As in the first embodiment, rollers 13 are provided at both ends of the housing 11 in the Y direction, for example, to contact the movable handrail 6.

[0119] During inspection, the housing 11 is moved in the +Y direction relative to the movable handrail 6. A DC current flows from the power supply 53 of the magnetizer 50 through the coil 52, generating a DC magnetic field in the magnetic body 51, thereby magnetizing the cable 61.

[0120] When the first magnetic sensor 20 reaches the magnetized portion of the cable 61, the combined magnetic field of the detection magnetic field generated by the detection magnet 22 and the magnetic field generated by the residual magnetization within the cable 61 acts on the detection element 21 of the first magnetic sensor 20. If the wire 61c of the cable 61 breaks, the detection element 21 detects the change in the combined magnetic field.

[0121] Next, when the second magnetic sensor 30 reaches the magnetized portion of the cable 61, the combined magnetic field of the detection magnetic field generated by the detection magnet 32 ​​and the magnetic field generated by the residual magnetization within the cable 61 acts on the detection element 31 of the second magnetic sensor 30. If the wire 61c of the cable 61 breaks, the detection element 31 detects a change in the combined magnetic field.

[0122] In this manner, since the combined magnetic field is detected by the detection elements 21 and 31 of the first magnetic sensor 20 and the second magnetic sensor 30 , it is possible to improve the accuracy of detecting the breakage of the wire 61 c of the cable 61 .

[0123] In addition, here, the magnetizer 50 is provided in the +Y direction of the first magnetic sensor 20 . However, in addition to this, the same magnetizer 50 may be provided in the −Y direction of the second magnetic sensor 30 .

[0124] The tensile-resistant body inspection device 1B 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-mentioned points.

[0125] As described above, the tensile member inspection device 1B of the third embodiment includes the magnetizer 50 in the +Y direction of the first magnetic sensor 20 . Therefore, similar to the second embodiment, the cable 61 can be magnetized by the magnetizer 50 before detecting the magnetic field, thereby improving detection accuracy.

[0126] Implementation method 4.

[0127] Figure 10 1C is a perspective view showing a tensile member inspection apparatus 1C according to Embodiment 4. The tensile member inspection apparatus 1C according to Embodiment 4 differs from the tensile member inspection apparatus 1 according to Embodiment 1 in that it includes a magnetizer 50C that is separate from the housing 11 .

[0128] The magnetizer 50C is arranged in the +Y direction of the housing 11. The magnetizer 50C includes a magnetic body 51, a coil 52 wound around the magnetic body 51, a power supply 53 connected to the coil 52, and a housing 55 that accommodates these. The magnetic body 51 and the coil 52 constitute an electromagnet.

[0129] The magnetic body 51 includes a first magnetic pole portion 511 and a second magnetic pole portion 512 facing each other in the Y direction, and a yoke portion 510 connecting these magnetic pole portions 511 and 512. The first magnetic pole portion 511 is located in the +Y direction, and the second magnetic pole portion 512 is located in the -Y direction.

[0130] The magnetic body 51 extends in the direction crossing the movable handrail 6, that is, in the X direction. The length of the magnetic body 51 in the X direction is preferably equal to the length of the flat portion 62a ( Figure 1 ) is greater than the width of the

[0131] The coil 52 is wound around the yoke portion 51c of the magnetic body 51, with the winding axis oriented in the Y direction. The power supply 53 is connected to the signal processing circuit 12 or the control device 15 via a cable (not shown). The power supply 53 flows a DC current through the coil 52. The DC current flowing through the coil 52 generates a DC magnetic field between the first magnetic pole portion 511 and the second magnetic pole portion 512, magnetizing the cable 61 of the movable handrail 6.

[0132] The housing 55 is the outer shell of the magnetizer 50C, and houses the magnetic body 51, the coil 52, and the power supply 53. The housing 55 may be provided with rollers 56 at both ends in the Y direction, for example, to contact the movable handrail 6.

[0133] The first magnetic sensor 20, the second magnetic sensor 30, and the signal processing circuit 12 are housed in the housing 11. As in the first embodiment, the housing 11 is provided with a roller 13 that contacts the movable handrail 6.

[0134] During inspection, the housing 11 and magnetizer 50C are moved relative to the movable handrail 6 in the +Y direction. The housing 11 and magnetizer 50C can be moved in the +Y direction by the driving force of a dedicated motor. Alternatively, the housing 11 and magnetizer 50C can be fixed in position while the movable handrail 6 is moved in the -Y direction.

[0135] A DC current flows from the power supply 53 of the magnetizer 50C to the coil 52, generating a DC magnetic field in the magnetic body 51, thereby magnetizing the cable 61. The magnetic field detection by the first magnetic sensor 20 and the second magnetic sensor 30 is as described in the third embodiment.

[0136] Here, the magnetizer 50C includes an electromagnet, but may also include a permanent magnet. Here, the magnetizer 50C is provided in the +Y direction of the housing 11, but in addition, the same magnetizer 50C may be provided in the -Y direction of the housing 11.

[0137] The tensile-resistant body inspection device 1C according to the fourth embodiment has the same configuration as the tensile-resistant body inspection device 1 according to the first embodiment except for the above-mentioned points.

[0138] As described above, the tensile member inspection device 1C of the fourth embodiment includes the magnetizer 50C in the +Y direction of the first magnetic sensor 20 . Therefore, the cable 61 can be magnetized by the magnetizer 50C before detecting the magnetic field, thereby improving detection accuracy.

[0139] Implementation method 5.

[0140] Figure 11 This is a cross-sectional view showing a tensile member inspection device 1D according to Embodiment 5. While the tensile member inspection devices 1 , 1A, 1B, and 1C according to Embodiments 1 to 4 described above include multiple magnetic sensors 20 and 30 , the tensile member inspection device 1D according to Embodiment 5 includes a single magnetic sensor 20D and further includes an acceleration sensor 16 .

[0141] The tensile testing device 1D includes a magnetic sensor 20D, an acceleration sensor 16, a signal processing circuit 12, and a housing 11 that accommodates these components. The housing 11 moves relative to the movable handrail 6 in the +Y direction. A pair of rollers 13 are provided at both ends of the housing 11 in the Y direction, for example, to contact the movable handrail 6.

[0142] The structure and detection principle of the magnetic sensor 20D are the same as those of the first magnetic sensor 20 in the first embodiment.

[0143] The acceleration sensor 16 detects vibration in a direction perpendicular to the moving direction (ie, +Y direction) of the housing 11 . More specifically, the acceleration sensor 16 detects vibration in the Z direction. The acceleration sensor 16 is connected to the signal processing circuit 12 via a cable 101 .

[0144] Figure 12 1 is a functional block diagram illustrating the correction processing unit 19 of the signal processing circuit 12. While the correction processing unit 19 is described herein as being part of the signal processing circuit 12, the correction processing unit 19 may also be part of the control device 15. The output of the magnetic sensor 20D and the output of the acceleration sensor 16 are input to the correction processing unit 19.

[0145] As described in the first embodiment, when the handrail 6 vibrates during inspection of the cable 61, the output waveform of the magnetic sensor 20D includes a vibration component. That is, the vibration component corresponds to noise (N) in the output waveform of the magnetic sensor 20D.

[0146] Therefore, the correction processing unit 19 corrects the output of the magnetic sensor 20D based on the output of the acceleration sensor 16. Specifically, the correction processing unit 19 includes an adaptive filter (ADF) 17 and a subtractor 18.

[0147] Adaptive filter 17 generates an output signal (N) corresponding to the vibration of moving handrail 6 based on the output signal (N') of acceleration sensor 16. Subtractor 18 subtracts the output signal (N) of adaptive filter 17 from the output signal (S+N) of magnetic sensor 20D. Subtractor 18 outputs a waveform (S) obtained by removing the vibration component (N) from the output waveform (S+N) of magnetic sensor 20D. Signal processing circuit 12 detects defects in cable 61, specifically, breaks in the wire, based on the output of correction processing unit 19.

[0148] As described above, in the tensile member inspection device 1D of the fifth embodiment, the output signal of the magnetic sensor 20D is corrected using the output signal of the acceleration sensor 16 . Therefore, the single magnetic sensor 20D can be used to detect defects in the cable 61 without the influence of vibration.

[0149] Except for the above-mentioned points, the tensile-resistant body inspection device 1D according to the fifth embodiment has the same configuration as the tensile-resistant body inspection device 1 according to the first embodiment.

[0150] As described above, the tensile member inspection device 1D of the fifth embodiment includes: a magnetic sensor 20D disposed opposite the movable handrail 6 (i.e., the object) including the cable 61 (i.e., the tensile member) and capable of relative movement relative to the movable handrail 6 in the direction in which the cable 61 extends; an acceleration sensor 16 for detecting vibration in a direction perpendicular to the relative movement direction of the movable handrail 6; and a signal processing circuit 12 for correcting the output of the magnetic sensor 20D based on the output of the acceleration sensor 16. By correcting the output of the magnetic sensor 20D using the output of the acceleration sensor 16, defect detection of the cable 61 can be performed without the influence of vibration.

[0151] In the tensile member inspection device 1D of the fifth embodiment, a plurality of magnetic sensors may be provided as described in the first embodiment. Furthermore, the magnetizers 41 and 42 having the permanent magnets 41 a and 42 a may be provided as described in the second embodiment, or the magnetizer 50 having the electromagnet may be provided as described in the third and fourth embodiments.

[0152] In the first to fifth 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.

[0153] <Inspection with rope>

[0154] Figure 13 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.

[0155] 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.

[0156] 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.

[0157] When inspecting the ribbon cord 71, the housing 11 is relatively moved in the +Y direction along the extending direction of the ribbon cord 71. The longitudinal direction of the first and second magnetic sensors 20 and 30 is the direction crossing the ribbon cord 71, that is, the X direction.

[0158] The first magnetic sensor 20 and the second magnetic sensor 30, which are a plurality of magnetic sensors, are disposed opposite to the power transmission belt 7, which includes a belt rope 71 as a tension-resistant member, and are movable relative to the power transmission belt 7 in the direction in which the belt rope 71 extends (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a gap D therebetween in the Y direction.

[0159] The first magnetic sensor 20 and the second magnetic sensor 30 detect changes in the magnetic field. As described in the first embodiment, the signal processing circuit 12 generates a composite waveform based on the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30. This eliminates the influence of vibration and accurately detects defects in the belt cord 71.

[0160] <Tire Carcass Inspection>

[0161] Figure 14 and Figure 15 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.

[0162] 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 15 ).

[0163] The carcass 81 is circumferentially aligned with the tire 8 (in Figure 14 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.

[0164] 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.

[0165] exist Figure 14 and Figure 15 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.

[0166] When inspecting the tire body 81, the housing 11 is relatively moved in the +Y direction along the extending direction of the tire body 81. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction crossing the tire body 81, that is, the X direction.

[0167] The first magnetic sensor 20 and the second magnetic sensor 30, which are a plurality of magnetic sensors, are disposed opposite to the tire 8, which includes a carcass 81 serving as a tensile member, and are movable relative to the tire 8 in the direction in which the carcass 81 extends (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are disposed at a distance D from each other in the Y direction.

[0168] In addition, Figure 14 and Figure 15 , the control device 15 is shown together with the housing 11 , but the control device 15 may be arranged at a location away from the housing 11 .

[0169] First magnetic sensor 20 and second magnetic sensor 30 detect changes in the magnetic field. As described in Embodiment 1, signal processing circuit 12 generates a composite waveform based on the output waveforms of first magnetic sensor 20 and second magnetic sensor 30. Therefore, defects in carcass 81 can be accurately detected without the influence of vibration.

[0170] <Inspection of tire belt>

[0171] Figure 16 and Figure 17 The structure of the tire 8 is shown in the perspective view and the cross-sectional view. Figure 14 and Figure 15 As explained. Figure 16 and Figure 17 In the example shown, the housing 11 is placed opposite to the side surface of the tire 8 .

[0172] exist Figure 16 and Figure 17 In the figure, the extension 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 (here, 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.

[0173] When inspecting the tape 82, the housing 11 is relatively moved in the +Y direction along the extending direction of the tape 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction crossing the tape 82, that is, the X direction.

[0174] The first and second magnetic sensors 20, 30, which are multiple magnetic sensors, are disposed opposite the tire 8, which includes the belt 82 serving as a tension member, and are movable relative to the tire 8 in the direction in which the belt 82 extends (i.e., the Y direction). The first and second magnetic sensors 20, 30 are disposed at a distance D in the Y direction.

[0175] In addition, Figure 16 , the control device 15 is shown together with the housing 11 , but the control device 15 may be arranged at a location away from the housing 11 .

[0176] First magnetic sensor 20 and second magnetic sensor 30 detect changes in the magnetic field. As described in Embodiment 1, signal processing circuit 12 generates a composite waveform based on the output waveforms of first magnetic sensor 20 and second magnetic sensor 30, thereby eliminating the influence of vibration and accurately detecting defects in belt 82.

[0177] Figure 18 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 18 In the illustrated example, the casing 11 is arranged to face the inner peripheral surface of the tire 8 .

[0178] exist Figure 18 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.

[0179] When inspecting the tape 82, the housing 11 is relatively moved in the +Y direction along the extending direction of the tape 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction crossing the tape 82, that is, the X direction.

[0180] First magnetic sensor 20 and second magnetic sensor 30 detect changes in the magnetic field. As described in Embodiment 1, signal processing circuit 12 generates a composite waveform based on the output waveforms of first magnetic sensor 20 and second magnetic sensor 30, thereby eliminating the influence of vibration and accurately detecting defects in belt 82.

[0181] exist Figure 18 In the example shown, the facing area ratio of the first magnetic sensor 20, the second magnetic sensor 30 and the belt 82 can be made smaller than Figure 16 and Figure 17 The example shown is large, so the detection accuracy can be further improved.

[0182] Figure 19 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 19 In the illustrated example, the housing 11 is opposed to the outer peripheral surface of the tire 8 .

[0183] When inspecting the tape 82, the housing 11 is relatively moved in the +Y direction along the extending direction of the tape 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction crossing the tape 82, that is, the X direction.

[0184] First magnetic sensor 20 and second magnetic sensor 30 detect changes in the magnetic field. As described in Embodiment 1, signal processing circuit 12 generates a composite waveform based on the output waveforms of first magnetic sensor 20 and second magnetic sensor 30, thereby eliminating the influence of vibration and accurately detecting defects in belt 82.

[0185] exist Figure 19 In the example shown, the first magnetic sensor 20 and the second magnetic sensor 30 are opposite to the outer peripheral surface of the tire 8, and therefore, Figure 18 Compared to the example shown, the lengths of the first magnetic sensor 20 and the second magnetic sensor 30 can be increased. Therefore, the facing area of ​​the first magnetic sensor 20 and the second magnetic sensor 30 and the belt 82 can be further increased, thereby further improving detection accuracy.

[0186] <Inspection of steel bars in concrete structures>

[0187] Figure 20This 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.

[0188] 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.

[0189] When the tensile member inspection device 1 inspects the reinforcing bar 91, the housing 11 is relatively moved in the +Y direction along the extending direction of the reinforcing bar 91. The longitudinal direction of the first and second magnetic sensors 20 and 30 is the direction crossing the reinforcing bar 91, that is, the X direction.

[0190] The first and second magnetic sensors 20 and 30, which are multiple magnetic sensors, are disposed opposite a concrete structure 9, which includes a steel bar 91 serving as a tensile member, and are movable relative to the concrete structure 9 in the direction in which the steel bar 91 extends (i.e., the Y direction). The first and second magnetic sensors 20 and 30 are disposed at a distance D from each other in the Y direction.

[0191] The first magnetic sensor 20 and the second magnetic sensor 30 detect changes in the magnetic field. As described in the first embodiment, the signal processing circuit 12 generates a composite waveform based on the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and accurately detecting defects in the steel bar 91.

[0192] Furthermore, by changing the orientation of housing 11 and relatively moving housing 11 in the direction in which rebar 92 extends, inspection of rebar 92 is also possible. In this case, first magnetic sensor 20 and second magnetic sensor 30, which are multiple magnetic sensors, are positioned opposite concrete structure 9, an object including rebar 92 serving as a tensile member, and are relatively movable relative to concrete structure 9 in the direction in which rebar 92 extends (i.e., the X direction). Furthermore, first magnetic sensor 20 and second magnetic sensor 30 are arranged with a gap D in the X direction.

[0193] 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.

[0194] exist Figures 13-19In the illustrated example, various tensile members are inspected using the tensile member inspection apparatus 1 of the first embodiment. However, the invention is not limited to the tensile member inspection apparatus 1 of the first embodiment, and the tensile member inspection apparatuses 1A to 1D of the second to fifth embodiments may also be used.

[0195] Furthermore, the tensile member inspection apparatuses 1 to 1D according to the first to fifth embodiments can be used for inspection of tensile members other than the above-mentioned cables, carcasses, belts, and reinforcing bars.

[0196] 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.

[0197] Description of labels

[0198] 1, 1A, 1B, 1C, 1D: tensile body inspection device; 5: magnetizer; 6: moving handrail (object); 7: power transmission belt (object); 8: tire (object); 9: concrete structure (object); 11: shell; 12: signal processing circuit; 13: roller; 15: control device; 16: acceleration sensor; 17: adaptive filter; 18: subtractor; 20: first magnetic sensor; 21: detection element; 22: detection magnet; 30: second magnetic sensor; 31: detection element; 32: detection magnet; 41, 42: magnetizer; 41a, 42a: permanent magnet; 50: magnetizer; 51: magnetic body; 52: coil; 53: power supply; 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 body inspection device comprises: a plurality of magnetic sensors disposed opposite to an object including a tension member and capable of relative movement relative to the object in a direction in which the tension member extends, the plurality of magnetic sensors being spaced apart in the direction of relative movement; as well as A processing device is configured to synthesize output waveforms of the plurality of magnetic sensors by shifting them by a time obtained by dividing the interval by the speed of the relative movement, and detect a defect of the tension member based on the synthesized waveform.

2. The tensile testing device according to claim 1, characterized in that: The interval is longer than a length obtained by multiplying a vibration period of the object by a speed of the relative movement.

3. The tensile testing device according to claim 1 or 2, characterized in that: The processing device synthesizes the output waveforms of the plurality of magnetic sensors through addition processing or multiplication processing.

4. The tensile body inspection device according to claim 1 or 2, characterized in that: The processing device synthesizes the output waveforms of the plurality of magnetic sensors through cross-correlation processing.

5. A tensile testing device, characterized in that: The tensile body inspection device comprises: a magnetic sensor disposed opposite to an object including a tension-resistant member and capable of relative movement relative to the object in an extending direction of the tension-resistant member; an acceleration sensor that detects vibration in a direction perpendicular to the direction of the relative movement; as well as A correction processing unit corrects the output of the magnetic sensor based on the output of the acceleration sensor.

6. The tensile body inspection device according to any one of claims 1 to 5, characterized in that: The tension-resistant member inspection device includes magnetizers on both sides of the magnetic sensor in the extending direction of the tension-resistant member, and the magnetizers magnetize the tension-resistant member.

7. The tensile body inspection device according to any one of claims 1 to 5, characterized in that: The tension-resistant member inspection device includes a magnetizer located ahead of the magnetic sensor in the direction of relative movement, and the magnetizer magnetizes the tension-resistant member.

8. The tensile body inspection device according to claim 6 or 7, characterized in that: The magnetizer has a permanent magnet.

9. The tensile body inspection device according to claim 6 or 7, characterized in that: The magnetizer has an electromagnet.

10. The tensile body inspection device according to any one of claims 6 to 9, characterized in that: The tensile body inspection device further includes a housing for housing the magnetic sensor. The magnetizer is provided separately from the housing.

11. The tensile body inspection device according to any one of claims 1 to 10, characterized in that: The object is a moving handrail of a passenger conveyor, The tensile body is the cable of the moving handrail.

12. The tensile body inspection device according to any one of claims 1 to 10, characterized in that: The object is a power transmission belt, The tension body is the cable of the power transmission belt.

13. The tensile body inspection device according to any one of claims 1 to 10, characterized in that: The object is a tire, The tensile body is the carcass or belt of the tire.

14. The tensile body inspection device according to any one of claims 1 to 10, characterized in that: The object is a concrete structure, The tensile body is the steel bar of the concrete structure.

Images