Tensile body inspection device

Abstract

A tensile body inspection device (1) comprises: a plurality of magnetic sensors (20, 30) that are provided so as to face an object (6) including a tensile body (61) and to be capable of moving relative to the object (6) in an extension direction of the tensile body (61), and that are arranged with a distance (D) therebetween in the direction of the relative movement; and processing devices (12, 15) that synthesize an output waveform of the plurality of magnetic sensors (20, 30) so as to be offset by a time (ΔT) obtained by dividing the interval (D) by the speed of the relative movement, and detect a defect of the tensile body (61) on the basis of the synthesized waveform.

Description

Tensile body inspection device

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

[0002] Wire ropes are built into the handrails of passenger conveyors such as escalators as tension members. Wire ropes are made of stranded wires, for example. The wires in wire ropes can break due to fatigue.

[0003] For example, a technique for detecting wire rope breakage has been developed in which the wire rope is strongly magnetized with a magnet and leakage magnetic flux leaking from the broken portion of the wire rope is detected with a coil (see, for example, Patent Documents 1 and 2). Also, an inspection device has been developed that uses a magnetic sensor to detect fraying caused by wire rope breakage (see, for example, Patent Document 3).

[0004] JP 2022-70599 A (see FIGS. 3A and 3B), WO 2007 / 116884 (see FIG. 3), and Japanese Patent Publication No. 7020564 (see FIG. 4).

[0005] However, the moving handrail of the passenger conveyor may vibrate during the wire rope inspection, and when the moving handrail vibrates, the distance between the wire rope and the magnetic sensor or the like changes, which affects the detection results.

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

[0007] The tensile body inspection device of the present disclosure comprises a plurality of magnetic sensors that face an object including a tensile body, are arranged so as to be movable relative to the object in the direction of extension of the tensile body, and are spaced apart in the direction of the relative movement; and a processing device that combines the output waveforms of the plurality of magnetic sensors by offsetting them by a time obtained by dividing the spacing by the speed of the relative movement, and detects defects in the tensile body based on the combined waveform.

[0008] The tension material inspection device disclosed herein combines the output waveforms of multiple magnetic sensors by offsetting them by a time interval calculated by dividing the distance between them by the relative movement speed, thereby eliminating the effects of vibration and enabling accurate defect detection.

[0009] 1 is a perspective view showing a tensile material inspection device of embodiment 1. FIG. 2 is a cross-sectional view showing a tensile material inspection device of embodiment 1. FIG. 3 is a schematic diagram showing the detection principle using a magnetic sensor of embodiment 1. FIG. 4 is a diagram (A) and (B) showing an output waveform of a first magnetic sensor and an output waveform of a second magnetic sensor of embodiment 1. FIG. 5 is a diagram (A) and (B) showing an output waveform of the first magnetic sensor of embodiment 1 and an output waveform after offset processing of the second magnetic sensor. FIG. 6 is a diagram showing a composite waveform obtained by combining the output waveform of the first magnetic sensor of embodiment 1 and the output waveform after processing of the second magnetic sensor. FIG. 7 is a perspective view showing a tensile material inspection device of embodiment 2. FIG. 8 is a cross-sectional view showing a tensile material inspection device of embodiment 2. FIG. 9 is a cross-sectional view showing a tensile material inspection device of embodiment 3. FIG. 10 is a cross-sectional view showing a tensile material inspection device of embodiment 4. FIG. 11 is a cross-sectional view showing a tensile material inspection device of embodiment 5. FIG. 12 is a cross-sectional view showing a control system of a tensile material inspection device of embodiment 5. FIG. 13 is a schematic diagram showing an example in which the tensile material inspection device of embodiment 1 is used to inspect the wire rope of a belt rope. FIG. 1 is a perspective view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire carcass. FIG. 2 is a cross-sectional view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire carcass. FIG. 3 is a perspective view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 4 is a cross-sectional view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 5 is a cross-sectional view showing another example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 6 is a cross-sectional view showing another example in which the tensile material inspection device of embodiment 1 is used to inspect a tire belt. FIG. 7 is a perspective view showing an example in which the tensile material inspection device of embodiment 1 is used to inspect reinforcing bars in a concrete structure.

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

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

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

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

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

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

[0016] The tensile material inspection device 1 is disposed so as to face the flat portion 62a of the moving handrail 6. The tensile material inspection device 1 includes a first magnetic sensor 20, a second magnetic sensor 30, a signal processing circuit 12, and a housing 11 that houses these components.

[0017] The first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face the moving handrail 6, which is an object including a wire rope 61 as a tension member, and are arranged so as to be movable relative to the moving handrail 6 in the extension direction of the wire rope 61 (i.e., the Y direction).

[0018] The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D in the Y direction. 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 moving handrail 6, i.e., in the X direction.

[0019] 2, the housing 11 is movable relative to the moving handrail 6 in the extension direction of the wire rope 61 (i.e., the Y direction). Here, the movement direction of the housing 11 relative to the moving handrail 6 is defined as the +Y direction. The speed of the movement of the housing 11 relative to the moving handrail 6 is defined as the relative movement speed V.

[0020] The housing 11 may be moved in the +Y direction by the driving force of a dedicated motor, or the position of the housing 11 may be fixed and the moving handrail 6 may be moved in the -Y direction. If the method of moving the moving handrail 6 in the -Y direction is used, the existing driving source of the escalator or moving walkway can be used, and therefore there is no need to provide a dedicated motor.

[0021] Here, the first magnetic sensor 20 is disposed in front of the housing 11 in the direction of relative movement with respect to the moving handrail 6 (i.e., the +Y direction), and the second magnetic sensor 30 is disposed behind it (i.e., the -Y direction).

[0022] The first magnetic sensor 20 has a detection element 21 arranged to face the moving handrail 6, and a detection magnet 22 arranged on the opposite side of the detection element 21 from the moving handrail 6 (here, in the +Z direction).

[0023] The detection element 21 and detection magnet 22 of the first magnetic sensor 20 extend in the direction across the moving handrail 6, i.e., in the X direction. It is desirable that the length of the detection element 21 and detection magnet 22 in the X direction be equal to or greater than the width of the flat portion 62a of the moving handrail 6 (FIG. 1).

[0024] The detection element 21 is composed of a magnetic detection element, a magnetic impedance element, or a pickup coil. Examples of the magnetic detection element include an anisotropic magnetoresistance (AMR) element, a giant magnetoresistance (GMR) element, and a tunnel magnetoresistance (TMR) element. The detection element 21 detects changes in a magnetic field.

[0025] The detection magnet 22 is composed of, for example, a permanent magnet. The detection magnet 22 has a north pole on the moving handrail 6 side and a south pole on the opposite side. The detection element 21 is located between the detection magnet 22 and the moving handrail 6. The detection magnet 22 generates a magnetic field (a detection magnetic field F, described below) that acts on the moving handrail 6. The detection magnet 22 may also be an electromagnet.

[0026] The second magnetic sensor 30 has a detection element 31 arranged to face the moving handrail 6, and a detection magnet 32 ​​arranged on the opposite side of the detection element 31 from the moving handrail 6 (here, in the +Z direction) across from the detection element 31. The detection element 31 is configured in the same way as the detection element 21 of the first magnetic sensor 20, and the detection magnet 32 ​​is configured in the same way as the detection magnet 22 of the first magnetic sensor 20.

[0027] A pair of rollers 13 that come into contact with the moving handrail 6 are provided, for example, at both ends of the housing 11 in the Y direction. These rollers 13 maintain a constant distance between the detecting elements 21, 31 of the first magnetic sensor 20 and the second magnetic sensor 30 and the moving handrail 6. In other words, the rollers 13 function as distance maintaining members.

[0028] The signal processing circuit 12 is connected to the detection element 21 via a cable 102 (FIG. 1) and to the detection element 31 via a cable 103 (FIG. 1). The signal processing circuit 12 is also connected to the control device 15 via a lead wire 14.

[0029] The signal processing circuit 12 receives output signals from 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. Note that the signal processing circuit 12 does not necessarily have to be housed in the housing 11, as long as it is placed in a position where it can detect the output signals from the detection elements 21 and 31.

[0030] The control device 15 is a computer or the like provided outside the tensile body inspection device 1. The control device 15 includes a CPU (Central Processing Unit), a storage device such as a memory, a display unit that displays information, and an input unit through which the user inputs information. The control device 15 can be placed in a location away from the housing 11.

[0031] <Principle of Defect Detection by First Magnetic Sensor 20 and Second Magnetic Sensor 30> Figure 3 is a schematic diagram showing the principle of detecting defects in the wire rope 61 by the first magnetic sensor 20. The detection magnet 22 is arranged with its north pole 22a facing toward the moving handrail 6 and its south pole 22b facing the opposite side. The detection element 21 is arranged between the north pole 22a of the detection magnet 22 and the moving handrail 6.

[0032] The magnetic flux emitted from the north pole 22a of the detection magnet 22 returns to the south pole 22b of the detection magnet 22. In other words, 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 there is no defect in the wire rope 61 of the moving handrail 6, the detection element 21 will always detect a constant magnetic field.

[0033] A defect in the wire rope 61 is, for example, fraying of the wires 61c of the wire rope 61. When the wires 61c of the wire rope 61 of the moving handrail 6 break and fray, causing the wires 61c to protrude from the surface of the moving handrail 6, a change occurs in the detection magnetic field F acting on the detection element 21, and the detection element 21 detects this change. The output signal of the detection element 21 is sent to the signal processing circuit 12.

[0034] The detection principle of the second magnetic sensor 30 is the same as that of the first magnetic sensor 20 .

[0035] <Processing of Output Signals of First Magnetic Sensor 20 and Second Magnetic Sensor 30> Fig. 4(A) is a diagram showing the output waveform of the first magnetic sensor 20, and Fig. 4(B) is a diagram showing the output waveform of the second magnetic sensor 30. The vertical axis of Fig. 4(A) represents the output voltage of the first magnetic sensor 20, and the horizontal axis represents time T. Similarly, the vertical axis of Fig. 4(B) represents the output voltage of the second magnetic sensor 30, and the horizontal axis represents time T.

[0036] 4A, the output waveform of the first magnetic sensor 20 fluctuates between positive and negative before and after time T0 when the first magnetic sensor 20 passes over the frayed portion of the wire 61c of the wire rope 61. The fluctuating portion of the output waveform due to the fraying of the wire 61c of the wire rope 61 is referred to as a fray component B1.

[0037] The moving handrail 6 may have unevenness during manufacture or use, and vibrations may occur at the uneven areas when inspecting the wire rope 61. If the time when vibration occurs is T1, the output waveform of the first magnetic sensor 20 fluctuates before and after time T1. The fluctuating portion of the output waveform due to vibration of the moving handrail 6 is designated as vibration component B2.

[0038] 4B, the output waveform of the second magnetic sensor 30 fluctuates between positive and negative before and after time T2 when the second magnetic sensor 30 passes through the frayed portion of the wire 61c of the wire rope 61. In other words, a fray component B1 appears before and after time T2.

[0039] The difference ΔT between the time T1 (Figure 4 (A)) when the first magnetic sensor 20 passes through the frayed portion and the time T2 when the second magnetic sensor 30 passes through the frayed 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 with respect to the moving handrail 6 (ΔT = D / V).

[0040] On the other hand, vibrations of the moving handrail 6 are 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, vibration component B2 appears around time T1.

[0041] The signal processing circuit 12 of the tensile body inspection device 1 of the first embodiment combines the output waveform of the first magnetic sensor 20 and the output waveform of the second magnetic sensor 30 after performing offset processing on the output waveform of the second magnetic sensor 30. This point will be described below.

[0042] Fig. 5A is a diagram showing the output waveform of the first magnetic sensor 20 in Fig. 4A. Fig. 5B is a diagram showing the waveform obtained by offsetting the output waveform of the second magnetic sensor 30 shown in Fig. 4B by -ΔT.

[0043] In the waveform after the offset process in FIG. 5(B), a fray component B1 due to fraying of the wire 61c of the wire rope 61 appears around time T0, similar to FIG. 5(A).

[0044] In the waveform after this offset processing, the fluctuation portion due to the vibration of the moving handrail 6 is also offset by -ΔT, so a vibration component B2 due to the vibration appears around time T1-ΔT. In other words, the vibration component B2 in the output waveform of Figure 5(B) appears at a timing ΔT earlier than the vibration component B2 in the output waveform of Figure 5(A).

[0045] 6 is a diagram showing a composite waveform obtained by combining the output waveform (FIG. 5A) of the first magnetic sensor 20 and the output waveform (FIG. 5B) after offset processing of the second magnetic sensor 30. The composite waveform is preferably an addition, multiplication, or cross-correlation method.

[0046] The fray component B1 occurs at the same time T0 in the output waveform of the first magnetic sensor 20 (FIG. 5A) and the output waveform after offset processing of the second magnetic sensor 30 (FIG. 5B). Therefore, the fray component B1 is amplified in the composite waveform of FIG.

[0047] In contrast, the vibration component B2 occurs at different times in the output waveform of the first magnetic sensor 20 (FIG. 5A) and the output waveform after offset processing of the second magnetic sensor 30 (FIG. 5B). Therefore, in the composite waveform of FIG. 6, the vibration component B2 is not amplified and remains dispersed.

[0048] 6, the fray component B1 is amplified but the vibration component B2 is not, resulting in a large difference in amplitude between the fray component B1 and the vibration component B2. Therefore, it is possible to determine whether or not the wire 61c of the wire rope 61 is frayed based on the fray component B1, and the influence of vibration can be eliminated.

[0049] The vibration component B2 in the composite waveform may be removed by, for example, cutting off components with amplitudes smaller than a specified value. By removing the vibration component B2, it is possible to more accurately determine whether or not the wires 61c of the wire rope 61 are frayed based on the fray component B1.

[0050] When the signal processing circuit 12 detects a fray in the wire 61c of the wire rope 61 based on the composite 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 or the like on the display unit indicating that a defect in the wire rope 61 has been detected.

[0051] Although the signal processing circuit 12 has been described as offsetting and synthesizing the output waveforms and detecting defects based thereon, these processes may be performed by the control device 15. In other words, the signal processing circuit 12 and the control device 15 constitute a processing device.

[0052] 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. In this way, when the output waveform of the first magnetic sensor 20 and the output waveform after offsetting of the second magnetic sensor 30 are combined, the vibration components B2 of the two sensors can be prevented from overlapping with each other, thereby effectively eliminating the effects of vibration.

[0053] The vibration period of the moving handrail 6 can be calculated from the shape of the moving handrail 6 and the occurrence of unevenness during manufacture or use.

[0054] As described above, the method of combining the output waveforms (FIGS. 5A and 5B) of the first magnetic sensor 20 and the second magnetic sensor 30 to obtain the composite waveform (FIG. 6) is preferably addition processing, multiplication processing, or cross-correlation processing.

[0055] When addition or multiplication processing is used, the vibration component B2 in the composite waveform can be made sufficiently smaller than the fray component B1, thereby effectively eliminating the influence of vibration. When cross-correlation processing is used, the vibration component B2 can be made even smaller than the fray component B1, thereby more effectively eliminating the influence of vibration.

[0056] Here, we have described an example in which the output waveform of the second magnetic sensor 30 is offset by -ΔT, but the output waveform of the first magnetic sensor 20 may also be offset by +ΔT.

[0057] Although the example described here is one in which the output waveforms of two magnetic sensors 20 and 30 are combined, the output waveforms of three or more magnetic sensors may also be combined. For example, if three magnetic sensors are arranged at a fixed interval D, the output waveform of the first magnetic sensor in the +Y direction, a waveform obtained by offsetting the output waveform of the second magnetic sensor by −ΔT (= D / V), and a waveform obtained by offsetting the output waveform of the third magnetic sensor by −2×ΔT (= 2×D / V) may be combined.

[0058] Effect of First Embodiment As described above, the tension member inspection device 1 of the first embodiment is provided with: a first magnetic sensor 20 and a second magnetic sensor 30 that face a moving handrail 6 (i.e., an object) including a wire rope 61 (i.e., a tension member); are provided so as to move relative to the moving handrail 6 in the direction of extension of the wire rope 61; and are arranged with a distance D in between in the direction of the relative movement; and a signal processing circuit 12 or a control device 15 (i.e., a processing device) that combines the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, offsetting them by a time ΔT obtained by dividing the distance D by the relative movement speed V, and detects defects in the wire rope 61 based on the combined waveform.

[0059] In this way, by offsetting and combining the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, the effects of vibration can be suppressed and fraying of the wires 61c of the wire rope 61 can be detected with high accuracy.

[0060] Furthermore, by making the distance 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 moving handrail 6 by the relative movement speed V, the vibration components B2 of each vibration waveform can be prevented from overlapping with each other, and the effects of vibration can be effectively eliminated.

[0061] Furthermore, by using addition or multiplication processing to synthesize the output waveform, the vibration component B2 in the synthesized waveform can be made sufficiently small, and the influence of vibration can be effectively eliminated.

[0062] Furthermore, by using cross-correlation processing to synthesize the output waveforms, the vibration component B2 in the synthesized waveform can be further reduced, and the influence of vibration can be more effectively eliminated.

[0063] Furthermore, since the first magnetic sensor 20 and the second magnetic sensor 30 are housed in a common housing 11 and have a roller 13 that contacts the housing 11, the distance between the detection elements 21, 31 and the moving handrail 6 can be maintained constant, thereby improving the accuracy of magnetic field detection by the first magnetic sensor 20 and the second magnetic sensor 30.

[0064] Embodiment 2. Fig. 7 is a perspective view showing a tensile body inspection apparatus 1A of embodiment 2. Fig. 8 is a cross-sectional view showing a tensile body inspection apparatus 1A of embodiment 2. The tensile body inspection apparatus 1A of embodiment 2 differs from the tensile body inspection apparatus 1 of embodiment 1 in that it includes magnetizers 41 and 42.

[0065] 8, the magnetizer 41 is disposed in the +Y direction of the first magnetic sensor 20. The magnetizer 41 has a permanent magnet 41a. The permanent magnet 41a has a first magnetic pole portion 411 and a second magnetic pole portion 412 that face 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.

[0066] Here, the first magnetic pole portion 411 of the permanent magnet 41a is the north pole and the second magnetic pole portion 412 is the south pole, but the polarities may be reversed. A magnetic field directed in the -Y direction is formed between the first magnetic pole portion 411 and the second magnetic pole portion 412 of the permanent magnet 41a. This magnetic field magnetizes the wire rope 61 of the moving handrail 6. Magnetizing the wire rope 61 means increasing the magnetization within the wire rope 61.

[0067] The magnetizer 42 is disposed in the −Y direction of the second magnetic sensor 30. The magnetizer 42 has a permanent magnet 42a. The permanent magnet 42a has a first magnetic pole portion 421 and a second magnetic pole portion 422 that face each other in the Y direction, and a yoke portion 420 that connects these magnetic pole portions 421 and 422. The first magnetic pole portion 421 is located in the +Y direction, and the second magnetic pole portion 422 is located in the −Y direction.

[0068] In this example, the first magnetic pole portion 421 of the permanent magnet 42a is an S pole and the second magnetic pole portion 422 is an N pole, but the polarities may be reversed. A magnetic field in the opposite direction to that of the permanent magnet 41a, i.e., a magnetic field directed 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.

[0069] The permanent magnets 41a, 42a of the magnetizers 41, 42 each extend in the direction across the moving handrail 6, i.e., in the X direction. It is also desirable that the length of the permanent magnets 41a, 42a in the X direction be equal to or greater than the width of the flat portion 62a (FIG. 7) of the moving handrail 6.

[0070] The first magnetic sensor 20, the second magnetic sensor 30, the magnetizers 41 and 42, and the signal processing circuit 12 are housed in a housing 11. As in the first embodiment, rollers 13 that come into contact with the moving handrail 6 are provided on both ends of the housing 11 in the Y direction, for example.

[0071] During inspection, the housing 11 is moved in the +Y direction relative to the moving handrail 6. The wire rope 61 is magnetized by the magnetic field of the permanent magnet 41a of the magnetizer 41.

[0072] When the first magnetic sensor 20 reaches the magnetized portion of the wire rope 61, the detection element 21 of the first magnetic sensor 20 is subjected to a composite magnetic field consisting of the detection magnetic field from the detection magnet 22 and the magnetic field due to residual magnetization within the wire rope 61. If fraying occurs in the wires 61c of the wire rope 61, the detection element 21 detects a change in the composite magnetic field.

[0073] Subsequently, when the second magnetic sensor 30 reaches the magnetized portion of the wire rope 61, the detection element 31 of the second magnetic sensor 30 is subjected to a composite magnetic field of the detection magnetic field from the detection magnet 32 ​​and the magnetic field due to residual magnetization within the wire rope 61. If fraying occurs in the wires 61c of the wire rope 61, the detection element 31 detects a change in the composite magnetic field.

[0074] In this way, since the combined magnetic field is detected by the detection elements 21, 31 of the first magnetic sensor 20 and the second magnetic sensor 30, the accuracy of detecting fraying of the wires 61c of the wire rope 61 can be improved.

[0075] Since the tensile material inspection device 1A has the magnetizer 41 in the +Y direction of the magnetic sensors 20 and 30 and the magnetizer 42 in the -Y direction, it is also possible to reverse the orientation of the housing 11 of the tensile material inspection device 1A and inspect the wire rope 61. In this case, after the wire rope 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.

[0076] Although the tension body inspection device 1A has two magnetizers 41 and 42 here, it may have only one of the magnetizers 41 and 42. That is, it is sufficient that the magnetizer is disposed in front of the first magnetic sensor 20 and the second magnetic sensor 30 in the direction of relative movement of the housing 11 with respect to the moving handrail 6 (i.e., in the +Y direction).

[0077] Except for the points described above, the tensile body inspection apparatus 1A of the second embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0078] As described above, in the tension member inspection device 1A of the second embodiment, the magnetizer 41 is provided in the +Y direction of the first magnetic sensor 20, so that the wire rope 61 can be magnetized by the magnetizer 41 before detecting the magnetic field. Therefore, the detection elements 21, 31 of the magnetic sensors 20, 30 can detect a composite magnetic field of the detection magnetic field from the detection magnets 22, 32 and the magnetic field due to residual magnetization in the wire rope 61, thereby improving detection accuracy.

[0079] 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 wire rope 61 can be inspected by reversing the orientation of the housing 11, thereby improving convenience.

[0080] 9 is a perspective view showing a tensile body inspection apparatus 1B of embodiment 3. The tensile body inspection apparatus 1B of embodiment 3 differs from the tensile body inspection apparatus 1 of embodiment 1 in that it includes a magnetizer 50 having an electromagnet.

[0081] The magnetizer 50 is disposed in the +Y direction of the first magnetic sensor 20. The magnetizer 50 has 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.

[0082] The magnetic body 51 has a first magnetic pole portion 511 and a second magnetic pole portion 512 that face each other in the Y direction, and a yoke portion 510 that connects 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.

[0083] The magnetic body 51 extends in the X direction, i.e., in the direction across the moving handrail 6. It is desirable that the length of the magnetic body 51 in the X direction be equal to or greater than the width of the flat portion 62a of the moving handrail 6 (FIG. 1).

[0084] 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 passes 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 wire rope 61 of the moving handrail 6.

[0085] The first magnetic sensor 20, the second magnetic sensor 30, the magnetizer 50, and the signal processing circuit 12 are housed in a housing 11. As in the first embodiment, rollers 13 that come into contact with the moving handrail 6 are provided on both ends of the housing 11 in the Y direction, for example.

[0086] During inspection, the housing 11 is moved in the +Y direction relative to the moving handrail 6. A DC current flows from the power supply 53 of the magnetizer 50 to the coil 52, generating a DC magnetic field in the magnetic body 51 and magnetizing the wire rope 61.

[0087] When the first magnetic sensor 20 reaches the magnetized portion of the wire rope 61, the detection element 21 of the first magnetic sensor 20 is subjected to a composite magnetic field consisting of the detection magnetic field from the detection magnet 22 and the magnetic field due to residual magnetization within the wire rope 61. If fraying occurs in the wires 61c of the wire rope 61, the detection element 21 detects a change in the composite magnetic field.

[0088] Subsequently, when the second magnetic sensor 30 reaches the magnetized portion of the wire rope 61, the detection element 31 of the second magnetic sensor 30 is subjected to a composite magnetic field of the detection magnetic field from the detection magnet 32 ​​and the magnetic field due to residual magnetization within the wire rope 61. If fraying occurs in the wires 61c of the wire rope 61, the detection element 31 detects a change in the composite magnetic field.

[0089] In this way, since the combined magnetic field is detected by the detection elements 21, 31 of the first magnetic sensor 20 and the second magnetic sensor 30, the accuracy of detecting fraying of the wires 61c of the wire rope 61 can be improved.

[0090] Although the magnetizer 50 is provided in the +Y direction of the first magnetic sensor 20 here, a similar magnetizer 50 may be provided in the −Y direction of the second magnetic sensor 30 in addition to this.

[0091] Except for the points described above, the tensile body inspection apparatus 1B of the third embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0092] As described above, the tension body inspection device 1B of embodiment 3 has the magnetizer 50 in the +Y direction of the first magnetic sensor 20, and therefore, as in embodiment 2, the wire rope 61 can be magnetized by the magnetizer 50 before detecting the magnetic field, thereby improving detection accuracy.

[0093] 10 is a perspective view showing a tensile body inspection apparatus 1C of embodiment 4. The tensile body inspection apparatus 1C of embodiment 4 differs from the tensile body inspection apparatus 1 of embodiment 1 in that it has a magnetizer 50C that is separate from the housing 11.

[0094] Magnetizer 50C is disposed in the +Y direction of housing 11. Magnetizer 50C has a magnetic body 51, a coil 52 wound around magnetic body 51, a power supply 53 connected to coil 52, and housing 55 accommodating these components. Magnetic body 51 and coil 52 form an electromagnet.

[0095] The magnetic body 51 has a first magnetic pole portion 511 and a second magnetic pole portion 512 that face each other in the Y direction, and a yoke portion 510 that connects 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.

[0096] The magnetic body 51 extends in the X direction, i.e., in the direction across the moving handrail 6. It is desirable that the length of the magnetic body 51 in the X direction be equal to or greater than the width of the flat portion 62a of the moving handrail 6 (FIG. 1).

[0097] 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 passes 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 wire rope 61 of the moving handrail 6.

[0098] The housing 55 is the outer shell of the magnetizer 50C, and houses inside it the magnetic body 51, the coil 52, and the power source 53. The housing 55 may be provided with rollers 56 that come into contact with the moving handrail 6, for example, at both ends in the Y direction.

[0099] The first magnetic sensor 20, the second magnetic sensor 30, and the signal processing circuit 12 are housed in a housing 11. The housing 11 is provided with rollers 13 that come into contact with the moving handrail 6, as in the first embodiment.

[0100] During inspection, the housing 11 and the magnetizer 50C are moved in the +Y direction relative to the moving handrail 6. The housing 11 and the magnetizer 50C may be moved in the +Y direction by the driving force of a dedicated motor. Alternatively, the positions of the housing 11 and the magnetizer 50C may be fixed, and the moving handrail 6 may be moved in the -Y direction.

[0101] A direct current flows from the power supply 53 of the magnetizer 50C to the coil 52, which generates a direct current magnetic field in the magnetic body 51, thereby magnetizing the wire rope 61. The magnetic field detection by the first magnetic sensor 20 and the second magnetic sensor 30 is as described in the third embodiment.

[0102] Here, the magnetizer 50C has an electromagnet, but it may have a permanent magnet. Also, here, the magnetizer 50C is provided in the +Y direction of the housing 11, but in addition, a similar magnetizer 50C may be provided in the -Y direction of the housing 11.

[0103] Except for the points described above, the tensile body inspection apparatus 1C of the fourth embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0104] As described above, the tension body inspection device 1C of embodiment 4 has a magnetizer 50C in the +Y direction of the first magnetic sensor 20, so that the wire rope 61 can be magnetized by the magnetizer 50C before detecting the magnetic field, thereby improving detection accuracy.

[0105] 11 is a cross-sectional view showing a tensile body inspection device 1D of embodiment 5. The tensile body inspection devices 1, 1A, 1B, and 1C of the above-described embodiments 1 to 4 have multiple magnetic sensors 20 and 30, but the tensile body inspection device 1D of embodiment 5 has a single magnetic sensor 20D and further has an acceleration sensor 16.

[0106] The tensile body inspection device 1D has a magnetic sensor 20D, an acceleration sensor 16, a signal processing circuit 12, and a housing 11 that houses these components. The housing 11 moves in the +Y direction relative to the moving handrail 6. A pair of rollers 13 that come into contact with the moving handrail 6 is provided, for example, on both ends of the housing 11 in the Y direction.

[0107] The configuration and detection principle of the magnetic sensor 20D are similar to those of the first magnetic sensor 20 of the first embodiment.

[0108] The acceleration sensor 16 detects vibrations in a direction perpendicular to the direction of movement of the housing 11 (i.e., the +Y direction). More specifically, the acceleration sensor 16 detects vibrations in the Z direction. The acceleration sensor 16 is connected to the signal processing circuit 12 by a cable 101.

[0109] 12 is a functional block diagram showing the correction processing unit 19 of the signal processing circuit 12. The correction processing unit 19 is described here as part of the signal processing circuit 12, but may be part of the control device 15. The correction processing unit 19 receives the output of the magnetic sensor 20D and the output of the acceleration sensor 16.

[0110] As explained in the first embodiment, if the moving handrail 6 vibrates during inspection of the wire rope 61, a vibration component is included in the output waveform of the magnetic sensor 20D. In other words, the vibration component corresponds to noise (N) in the output waveform of the magnetic sensor 20D.

[0111] 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 has an adaptive filter (ADF) 17 and a subtractor .

[0112] The adaptive filter 17 generates an output signal (N) corresponding to the vibration of the moving handrail 6 based on the output signal (N') of the acceleration sensor 16. The subtractor 18 subtracts the output signal (N) of the adaptive filter 17 from the output signal (S+N) of the magnetic sensor 20D. The subtractor 18 outputs a waveform (S) obtained by removing the vibration component (N) from the output waveform (S+N) of the magnetic sensor 20D. The signal processing circuit 12 detects defects in the wire rope 61, specifically fraying of the wires, based on the output of the correction processing unit 19.

[0113] In this way, in the tension member inspection device 1D of embodiment 5, the output signal of the acceleration sensor 16 is used to correct the output signal of the magnetic sensor 20D, so that defects in the wire rope 61 can be detected using a single magnetic sensor 20D while eliminating the effects of vibration.

[0114] Except for the points mentioned above, the tensile body inspection apparatus 1D of the fifth embodiment is configured similarly to the tensile body inspection apparatus 1 of the first embodiment.

[0115] As described above, the tension member inspection device 1D of the fifth embodiment is equipped with a magnetic sensor 20D that faces the moving handrail 6 (i.e., an object) including the wire rope 61 (i.e., a tension member) and is provided so as to be movable relative to the moving handrail 6 in the direction of extension of the wire rope 61, an acceleration sensor 16 that detects vibrations in a direction perpendicular to the relative movement direction of the moving handrail 6, and a signal processing circuit 12 that corrects 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, it is possible to detect defects in the wire rope 61 without the effects of vibrations.

[0116] The tension body inspection device 1D of the fifth embodiment may be provided with a plurality of magnetic sensors as described in the first embodiment. Also, the magnetizers 41 and 42 having permanent magnets 41 a and 42 a may be provided as described in the second embodiment, or the magnetizer 50 having an electromagnet may be provided as described in the third and fourth embodiments.

[0117] In the first to fifth embodiments, the case where the tensile member to be inspected is the wire rope 61 of the moving handrail 6 of a passenger conveyor has been described, but as will be described below, inspection of other tensile members is also possible. In the following, inspection of various tensile members using the tensile member inspection device 1 of the first embodiment will be described.

[0118] 13 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.

[0119] The power transmission belt 7 is endless and has a rectangular cross section in a plane perpendicular to its extending direction. The width direction of the power transmission belt 7 is defined as the X direction, the extending direction of the power transmission belt 7 is defined as the Y direction, and the direction perpendicular to the X direction and the Y direction is defined as the Z direction.

[0120] The power transmission belt 7 has a resin base body 72 and a belt rope 71 serving as a tension member provided inside the base body 72. The belt rope 71 is made by twisting together element wires made of metal wires. The belt ropes 71 extend in the Y direction and are arranged in multiple rows in the X direction.

[0121] When inspecting the belt rope 71, the housing 11 is moved relatively in the +Y direction along the extension direction of the belt rope 71. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is set to the direction crossing the belt rope 71, i.e., the X direction.

[0122] The first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face the power transmission belt 7, which is an object including a belt rope 71 as a tension member, and are provided so as to be movable relative to the power transmission belt 7 in the extension direction of the belt rope 71 (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D between them in the Y direction.

[0123] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the belt rope 71.

[0124] 14 and 15 are a perspective view and a cross-sectional view showing a method for inspecting the carcass 81 of the tire 8. The tire 8 is, for example, a radial tire.

[0125] The tire 8 has a rubber substrate 80, a plurality of carcasses 81 that form the framework of the tire 8, a belt 82 that is a reinforcing band, and a pair of beads 83 (FIG. 15) that are connected to the wheel.

[0126] The carcass 81 extends in a U-shape in a cross section perpendicular to the circumferential direction of the tire 8 (indicated by arrow R in FIG. 14 ). The carcass 81 has both end portions 81 a on the inner circumferential side of the tire 8. The belt 82 extends in the circumferential direction along the outer periphery of the tire 8. The beads 83 are connected to the end portions 81 a of the carcass 81 and extend in the circumferential direction along the inner periphery of the tire 8.

[0127] The carcass 81 is, for example, a strand of metal wire. The belt 82 is, for example, a cylindrical metal belt. The bead 83 is, for example, a bundle of metal wires.

[0128] 14 and 15, the extension direction of the carcass 81, which is the tensile member to be inspected, is defined as the Y direction, the width direction of the carcass 81 (i.e., the circumferential direction of the tire 8) is defined as the X direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction.

[0129] When inspecting the carcass 81, the housing 11 is moved relatively in the +Y direction along the extension direction of the carcass 81. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction across the carcass 81, i.e., the X direction.

[0130] The first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face the tire 8, which is an object including a carcass 81 as a tension member, and are provided so as to be movable relative to the tire 8 in the extension direction of the carcass 81 (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D between them in the Y direction.

[0131] Although FIGS. 14 and 15 show the control device 15 together with the housing 11, the control device 15 may be located at a location separate from the housing 11.

[0132] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the carcass 81.

[0133] <Inspection of tire belt> Figures 16 and 17 are a perspective view and a cross-sectional view showing a method for inspecting the belt 82 of a tire 8. The configuration of the tire 8 is as described with reference to Figures 14 and 15. In the example shown in Figures 16 and 17, the housing 11 is placed opposite the side surface of the tire 8.

[0134] 16 and 17, the extension direction of the belt 82, which is the tensile member to be inspected (i.e., the circumferential direction of the tire 8), is defined as the Y direction, the direction across the belt 82 (here, the radial direction of the tire 8) is defined as the X direction, and the direction perpendicular to both the X direction and the Y direction is defined as the Z direction.

[0135] When inspecting the belt 82, the housing 11 is moved relatively in the +Y direction along the extension direction of the belt 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction across the belt 82, i.e., the X direction.

[0136] The first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face the tire 8, which is an object including the belt 82 as a tension member, and are provided so as to be movable relative to the tire 8 in the extension direction of the belt 82 (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D between them in the Y direction.

[0137] Although FIG. 16 shows the control device 15 together with the housing 11, the control device 15 may be located at a location separate from the housing 11.

[0138] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the belt 82.

[0139] 18 is a cross-sectional view showing another example of the relative position of the tension body inspection device 1 with respect to the tire 8. In the example shown in FIG.

[0140] In Figure 18, the extension direction of the belt 82, which is the tensile member to be inspected (i.e., the width direction of the tire 8), is the Y direction, the width direction of the belt 82 (i.e., the circumferential direction of the tire 8) is the X direction, and the direction perpendicular to both the X direction and the Y direction is the Z direction.

[0141] When inspecting the belt 82, the housing 11 is moved relatively in the +Y direction along the extension direction of the belt 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction across the belt 82, i.e., the X direction.

[0142] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the belt 82.

[0143] In the example shown in Figure 18, the opposing area between the first magnetic sensor 20 and the second magnetic sensor 30 and the belt 82 can be made larger than in the examples shown in Figures 16 and 17, thereby enabling further improvement in detection accuracy.

[0144] 19 is a cross-sectional view showing another example of the relative position of the tension body inspection device 1 with respect to the tire 8. In the example shown in FIG.

[0145] When inspecting the belt 82, the housing 11 is moved relatively in the +Y direction along the extension direction of the belt 82. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction across the belt 82, i.e., the X direction.

[0146] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the belt 82.

[0147] In the example shown in Fig. 19, the first magnetic sensor 20 and the second magnetic sensor 30 face the outer peripheral surface of the tire 8, so the lengths of the first magnetic sensor 20 and the second magnetic sensor 30 can be made longer than in the example shown in Fig. 18. Therefore, the facing area between the first magnetic sensor 20 and the second magnetic sensor 30 and the belt 82 can be made even larger, and the detection accuracy can be further improved.

[0148] <Inspection of reinforcing bars in a concrete structure> Figure 20 is a perspective view showing a method for inspecting reinforcing bars 91 in a concrete structure 9. The concrete structure 9 is, for example, reinforced concrete. The concrete structure 9 has concrete 90 and a plurality of reinforcing bars 91 and a plurality of reinforcing bars 92 arranged inside the concrete 90. The reinforcing bars 91 and the reinforcing bars 92 are arranged in directions perpendicular to each other. Both the reinforcing bars 91 and the reinforcing bars 92 are, for example, round steel bars.

[0149] The extension direction of reinforcing bars 91 is the Y direction, the extension direction of reinforcing bars 92 is the X direction, and the direction perpendicular to the X and Y directions is the Z direction. Multiple reinforcing bars 91 are arranged side by side in the X direction, and multiple reinforcing bars 92 are arranged side by side in the Y direction.

[0150] When inspecting the reinforcing bar 91 using the tensile material inspection device 1, the housing 11 is moved relatively in the +Y direction along the extension direction of the reinforcing bar 91. The longitudinal direction of the first magnetic sensor 20 and the second magnetic sensor 30 is the direction crossing the reinforcing bar 91, i.e., the X direction.

[0151] The first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face a concrete structure 9, which is an object including reinforcing bars 91 as tension members, and are provided so as to be movable relative to the concrete structure 9 in the extension direction of the reinforcing bars 91 (i.e., the Y direction). The first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a gap D between them in the Y direction.

[0152] 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 from the output waveforms of the first magnetic sensor 20 and the second magnetic sensor 30, thereby eliminating the influence of vibration and enabling accurate detection of defects in the reinforcing bar 91.

[0153] Furthermore, the reinforcing bars 92 can also be inspected by changing the orientation of the housing 11 and moving the housing 11 relatively in the extension direction of the reinforcing bars 92. In this case, the first magnetic sensor 20 and the second magnetic sensor 30, which are multiple magnetic sensors, face the concrete structure 9, which is an object that includes the reinforcing bars 92 as tension members, and are provided so as to be movable relatively in the extension direction of the reinforcing bars 92 (i.e., the X direction) with respect to the concrete structure 9. Furthermore, the first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a gap D between them in the X direction.

[0154] Here, the case has been described where the concrete structure 9 is reinforced concrete and the tension members are reinforcing bars 91, 92. However, the concrete structure 9 may be a prestressed concrete (PC) steel material, and the tension members may be steel materials such as PC steel materials.

[0155] In the examples shown in Figures 13 to 19, examples of inspecting various tensile bodies using the tensile body inspection device 1 of embodiment 1 are described, but this is not limited to the tensile body inspection device 1 of embodiment 1, and the tensile body inspection devices 1A to 1D of embodiments 2 to 5 may also be used.

[0156] Furthermore, the tensile body inspection devices 1 to 1D of the first to fifth embodiments can be used to inspect tensile bodies other than the above-mentioned wire ropes, carcasses, belts, and reinforcing bars.

[0157] Although the preferred embodiments have been specifically described above, the present disclosure is not limited to the above-described embodiments, and various improvements and modifications can be made.

[0158] REFERENCE SIGNS LIST 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 Housing, 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 source, 61 Wire rope (tension body), 71 Belt rope (tension body), 81 Carcass (tension body), 82 Belt (tension member), 91, 92 Steel bar (tension member).

Claims

1. a plurality of magnetic sensors facing an object including a tension body, provided to be movable relative to the object in an extension direction of the tension body, and arranged at intervals in the direction of the relative movement that are longer than a length obtained by multiplying a vibration period of the object by a speed of the relative movement; a processing device that synthesizes output waveforms of the plurality of magnetic sensors by offsetting the output waveforms by a time obtained by dividing the interval by the speed of the relative movement, and detects defects in the tension member based on a waveform obtained by removing components having an amplitude smaller than a specified value from the synthesized waveform; A tension member inspection device comprising:

2. The processing device synthesizes output waveforms of the plurality of magnetic sensors by addition or multiplication.

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

3. The processing device synthesizes output waveforms of the plurality of magnetic sensors by cross-correlation processing.

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

4. A magnetizer for magnetizing the tension body is provided on both sides of the magnetic sensor in the extension direction of the tension body.

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

5. A magnetizer for magnetizing the tension body is provided in front of the magnetic sensor in the direction of the relative movement.

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

6. The magnetizer has a permanent magnet.

6. The tension member inspection device according to claim 4 or 5.

7. The magnetizer has an electromagnet 6. The tension member inspection device according to claim 4 or 5.

8. The magnetic sensor further includes a housing that houses the magnetic sensor. The magnetizer is provided at a distance from the housing.

6. The tension member inspection device according to claim 4 or 5.

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

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

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

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

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

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

12. the object is a concrete structure, The tension member is a reinforcing bar of the concrete structure.

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

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