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

[Technical field]

[0001] The present disclosure relates to a tension body inspection device. [Background technology]

[0002] Wire ropes are built into handrails and other structures of passenger conveyors such as escalators as tension members. The wire ropes are made of strands of wires, for example. The wires of the wire ropes may break due to fatigue.

[0003] For example, a technique for detecting breakage of a wire rope has been developed in which the wire rope is strongly magnetized with a magnet and the leakage magnetic flux leaking from the broken part 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 breakage of the wire rope (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-70599 A (see Figs. 3(A) and (B)) [Patent Document 2] International Publication WO2007 / 116884 (see Figure 3) [Patent Document 3] Patent Publication No. 7020564 (see Figure 4) Summary of the Invention [Problem to be solved by the invention]

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

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

[0007] The tension member inspection device of the present disclosure is An inspection device for a tensile body of an object including a tensile body, the object being movable in an extension direction of the tensile body and having a predetermined vibration period, Facing the object , the The direction of movement corresponds to the period of vibration of the object. The transfer A plurality of magnetic sensors are arranged at intervals longer than the length multiplied by the speed of relative movement, and the output waveforms of the plurality of magnetic sensors are offset by a time obtained by dividing the interval by the speed of relative movement, and components with amplitudes smaller than a specified value are removed from the composite waveform. cut and a processing device for detecting defects in the tension member based on the waveform. Effect of the Invention

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

[0009] [Figure 1] 1 is a perspective view showing a tension body inspection device according to a first embodiment. [Diagram 2] 1 is a cross-sectional view showing a tension body inspection device according to a first embodiment. [Diagram 3] 1 is a schematic diagram showing the detection principle of the magnetic sensor according to the first embodiment. [Figure 4] 5A and 5B are diagrams showing output waveforms of a first magnetic sensor and a second magnetic sensor according to the first embodiment. [Diagram 5] 5A and 5B are diagrams illustrating an output waveform of a first magnetic sensor and an output waveform of a second magnetic sensor after offset processing in the first embodiment. [Figure 6] 4 is a diagram showing a composite waveform obtained by combining an output waveform of the first magnetic sensor and a processed output waveform of the second magnetic sensor according to the first embodiment. FIG. [Figure 7] FIG. 11 is a perspective view showing a tension body inspection device according to a second embodiment. [Figure 8] FIG. 11 is a cross-sectional view showing a tension body inspection device according to a second embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing a tension body inspection device according to a third embodiment. [Figure 10] FIG. 11 is a cross-sectional view showing a tensile body inspection device according to a fourth embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a tension body inspection device according to a fifth embodiment. [Figure 12] FIG. 13 is a cross-sectional view showing a control system of the tension body inspection apparatus of the fifth embodiment. [Figure 13] FIG. 2 is a schematic diagram showing an example in which the tension member inspection device of the first embodiment is used to inspect a wire rope of a belt rope. [Figure 14] FIG. 1 is a perspective view showing an example in which the tensile body inspection device of the first embodiment is used to inspect a tire carcass. [Figure 15] 1 is a cross-sectional view showing an example in which the tensile body inspection device of the first embodiment is used to inspect a tire carcass. [Figure 16] FIG. 1 is a perspective view showing an example in which the tension member inspection device of the first embodiment is used to inspect a belt of a tire. [Figure 17] FIG. 2 is a cross-sectional view showing an example in which the tensile material inspection device of the first embodiment is used to inspect a belt of a tire. [Figure 18] FIG. 4 is a cross-sectional view showing another example in which the tensile member inspection device of the first embodiment is used to inspect a belt of a tire. [Figure 19] FIG. 4 is a cross-sectional view showing another example in which the tensile member inspection device of the first embodiment is used to inspect a belt of a tire. [Figure 20] 1 is a perspective view showing an example in which the tension member inspection device of the first embodiment is used to inspect reinforcing bars in a concrete structure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a tension member 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 appropriately modified or combined.

[0011] Embodiment 1 <Configuration of tensile body inspection device 1> Fig. 1 is a perspective view showing a tensile material inspection apparatus 1 of the first embodiment. Fig. 2 is a cross-sectional view showing the tensile material inspection apparatus 1 of the first embodiment. As shown in Fig. 1, the tensile material inspection apparatus 1 is installed on an upper portion of 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 resin base body 62 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 body 62 is made of a resin such as rubber or polyurethane. The base body 62 has no ends. That is, the base body 62 is formed by joining both ends of a long resin member in the longitudinal direction. The base body 62 has a flat portion 62a and U-shaped curved portions 62b on both sides in the width direction in a cross section perpendicular to the extending direction.

[0014] The wire rope 61 is formed by twisting together wires made of metal wires such as carbon steel. A plurality of wire ropes 61 are arranged 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 defined as the X direction, and the extension direction of the moving handrail 6 is defined as the Y direction. The direction perpendicular to both the X direction and the Y direction is defined as the Z direction. Here, the Z direction is the up-down direction. In FIG. 1 etc., the Y direction is a linear direction, but it may 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 in which these are housed.

[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 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 disposed with a distance D therebetween 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 elongated in the direction crossing the moving handrail 6, i.e., in the X direction.

[0019] 2, the housing 11 is capable of moving 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. Also, 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 involves moving the moving handrail 6 in the -Y direction, the existing driving source of the escalator or moving walkway can be used, so 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 relative movement direction with respect to the moving handrail 6 (ie, +Y direction), and the second magnetic sensor 30 is disposed behind it (ie, -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 to 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 a direction transverse to the moving handrail 6, i.e., in the X direction. It is desirable that the length of the detection element 21 and the 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. The magnetic detection element is, for example, an anisotropic magnetoresistance (AMR) element, a giant magnetoresistance (GMR) element, or a tunnel magnetoresistance (TMR) element. The detection element 21 detects a change 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 later) that acts on the moving handrail 6. The detection magnet 22 may 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). 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.

[0027] A pair of rollers 13 that come into contact with the moving handrail 6 is provided, for example, at both ends of the housing 11 in the Y direction. These rollers 13 keep a constant distance between the detection 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] Signal processing circuit 12 is connected to detection element 21 via cable 102 (FIG. 1), and is connected to detection element 31 via cable 103 (FIG. 1). Signal processing circuit 12 is also connected to control device 15 via 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, and it is sufficient if it is disposed in a position where the output signals of the detection elements 21 and 31 can be detected.

[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 a user inputs information. The control device 15 can be placed at a position away from the housing 11.

[0031] <Principle of Defect Detection by First Magnetic Sensor 20 and Second Magnetic Sensor 30> 3 is a schematic diagram showing the principle of detecting a defect in a wire rope 61 by a first magnetic sensor 20. The detection magnet 22 is arranged with the N pole 22a facing the moving handrail 6 and the S pole 22b facing the opposite side. The detection element 21 is arranged between the N 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. 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, unless there is a defect in the wire rope 61 of the moving handrail 6, the detection element 21 always detects 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 onto 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 similar to that of the first magnetic sensor 20.

[0035] <Processing of Output Signals from First Magnetic Sensor 20 and Second Magnetic Sensor 30> Fig. 4(A) is a diagram showing an output waveform of the first magnetic sensor 20, and Fig. 4(B) is a diagram showing an 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] 4(A), 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 through 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 spots 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 defined as vibration component B2.

[0038] 4(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 frayed portion of the wire 61c of the wire rope 61. In other words, a frayed component B1 appears around 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 distance D between the magnetic sensors 20, 30 divided 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, 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, vibration component B2 appears around time T1.

[0041] The signal processing circuit 12 of the tensile material 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. 5(A) is a diagram showing an output waveform of the first magnetic sensor 20 in Fig. 4(A). Fig. 5(B) is a diagram showing a waveform obtained by offsetting the output waveform of the second magnetic sensor 30 shown in Fig. 4(B) by -ΔT.

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

[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 that vibration component B2 due to the vibration appears around time T1-ΔT. In other words, vibration component B2 in the output waveform in Fig. 5(B) appears at a timing ΔT earlier than vibration component B2 in the output waveform in Fig. 5(A).

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

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

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

[0048] 6, the fraying component B1 is amplified but the vibration component B2 is not amplified, so the difference in amplitude between the fraying component B1 and the vibration component B2 becomes large. Therefore, it becomes possible to determine the presence or absence of fraying in the wire 61c of the wire rope 61 based on the fraying component B1, and the influence of vibration can be eliminated.

[0049] The vibration component B2 in the composite waveform may be removed, for example, by cutting components whose amplitude is 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 fraying of the wires 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 it has been described here that the signal processing circuit 12 performs offset and synthesis of the output waveforms and detects 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] It is desirable that the distance D between the first magnetic sensor 20 and the second magnetic sensor 30 is 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 offset of the second magnetic sensor 30 are combined, it is possible to prevent the vibration components B2 from overlapping with each other. Therefore, it is possible to effectively eliminate the influence 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 synthesizing the output waveforms (FIGS. 5(A) and (B)) of the first magnetic sensor 20 and the second magnetic sensor 30 to obtain the synthetic waveform (FIG. 6) is preferably addition processing, multiplication processing, or cross-correlation processing.

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

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

[0057] Also, although an example of combining the output waveforms of two magnetic sensors 20, 30 has been described here, the output waveforms of three or more magnetic sensors may be combined. For example, when three magnetic sensors are arranged at a constant interval D, it is sufficient to combine 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).

[0058] <Advantages of the First Embodiment> As described above, the tension member inspection device 1 of embodiment 1 faces a moving handrail 6 (i.e., an object) including a wire rope 61 (i.e., a tension member), and is provided for relative movement with respect to the moving handrail 6 in the extension direction of the wire rope 61, and is arranged with a distance D between them in the direction of the relative movement, and is equipped with 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 by 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 effects of vibration can be eliminated more effectively.

[0063] In addition, 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 detection accuracy of the magnetic field 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 the 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, 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 an N pole and the second magnetic pole portion 412 is an S pole, but the polarities may be reversed. A magnetic field facing 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. The wire rope 61 of the moving handrail 6 is magnetized by this magnetic field. Magnetizing the wire rope 61 refers to 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, 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] Here, 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 above-mentioned permanent magnet 41a, i.e., a magnetic field heading 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 a direction transverse to the moving handrail 6, i.e., in the X direction. In addition, it is desirable that the length of the permanent magnets 41a, 42a in the X direction is 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, for example, in the Y direction.

[0071] During the 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 of the detection magnetic field from the detection magnet 22 and the magnetic field due to residual magnetization in the wire rope 61. If fraying occurs in the strands 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 in the wire rope 61. If fraying occurs in the strands 61c of the wire rope 61, the detection element 31 detects a change in the composite magnetic field.

[0074] In this manner, since the composite 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, the direction of the casing 11 of the tensile material inspection device 1A can be reversed to 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 second magnetic sensor 30 and the first magnetic sensor 20 detect the magnetic field.

[0076] Here, the tensile body inspection device 1A has two magnetizers 41 and 42, but 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 relative movement direction of the housing 11 with respect to the moving handrail 6 (i.e., in the +Y direction).

[0077] Except for the above-mentioned points, 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 tensile 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 the magnetic field is detected. Therefore, the detection elements 21, 31 of the magnetic sensors 20, 30 can detect a composite magnetic field of the detection magnetic field caused by the detection magnets 22, 32 and the magnetic field caused by the residual magnetization in the wire rope 61, and the detection accuracy can be improved.

[0079] In addition, since magnetizer 41 is provided in the +Y direction of the first magnetic sensor 20 and 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] Embodiment 3 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 source 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 facing each other in the Y direction, and a yoke portion 510 connecting these magnetic pole portions 511, 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 a direction transverse to the moving handrail 6, that is, in the X direction. It is desirable that the length of the magnetic body 51 in the X direction is 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, and the winding axis direction is the Y direction. The power source 53 is connected to the signal processing circuit 12 by a cable (not shown). The power source 53 passes a direct current through the coil 52. The direct current flowing through the coil 52 generates a direct current magnetic field between the first magnetic pole portion 511 and the second magnetic pole portion 512, and the wire rope 61 of the moving handrail 6 is magnetized.

[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, for example, in the Y direction.

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

[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 of the detection magnetic field from the detection magnet 22 and the magnetic field due to residual magnetization in the wire rope 61. If fraying occurs in the strands 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 in the wire rope 61. If fraying occurs in the strands 61c of the wire rope 61, the detection element 31 detects a change in the composite magnetic field.

[0089] In this manner, since the composite 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] In this embodiment, the magnetizer 50 is provided in the +Y direction of the first magnetic sensor 20, but in addition to this, a similar magnetizer 50 may be provided in the -Y direction of the second magnetic sensor 30.

[0091] Except for the above-mentioned points, 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 tensile material inspection device 1B of embodiment 3 has the magnetizer 50 in the +Y direction of the first magnetic sensor 20, so that, similar to embodiment 2, the wire rope 61 can be magnetized by the magnetizer 50 before detecting the magnetic field, thereby improving the detection accuracy.

[0093] Embodiment 4 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 the tensile body inspection apparatus 1C of embodiment 4 has a magnetizer 50C separate from the housing 11.

[0094] The magnetizer 50C is disposed in the +Y direction of the housing 11. The magnetizer 50C has a magnetic body 51, a coil 52 wound around the magnetic body 51, a power source 53 connected to the coil 52, and a housing 55 that houses these. The magnetic body 51 and the coil 52 form an electromagnet.

[0095] The magnetic body 51 has 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, 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 a direction transverse to the moving handrail 6, that is, in the X direction. It is desirable that the length of the magnetic body 51 in the X direction is 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, and the winding axis direction is the Y direction. The power source 53 is connected to the signal processing circuit 12 or the control device 15 by a cable (not shown). The power source 53 passes a direct current through the coil 52. The direct current flowing through the coil 52 generates a direct current magnetic field between the first magnetic pole portion 511 and the second magnetic pole portion 512, and the wire rope 61 of the moving handrail 6 is magnetized.

[0098] Housing 55 is the outer shell of magnetizer 50C, and houses magnetic body 51, coil 52, and power source 53 inside. Housing 55 may be provided with rollers 56 that come into contact with 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, similar to the first embodiment.

[0100] During the 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. Also, 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 a power source 53 of the magnetizer 50C to the coil 52, which generates a direct current magnetic field in the magnetic body 51 to magnetize 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 to this, a similar magnetizer 50C may be provided in the -Y direction of the housing 11.

[0103] Except for the above-mentioned points, 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 tensile material inspection apparatus 1C of embodiment 4 has the 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 the detection accuracy.

[0105] Embodiment 5. 11 is a cross-sectional view showing a tensile material inspection apparatus 1D of embodiment 5. The tensile material inspection apparatuses 1, 1A, 1B, and 1C of the above-mentioned embodiments 1 to 4 have a plurality of magnetic sensors 20 and 30, but the tensile material inspection apparatus 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. 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 on both ends of the housing 11 in the Y direction, for example.

[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 a part of the signal processing circuit 12, but may be a part of the control device 15. The output of the magnetic sensor 20D and the output of the acceleration sensor 16 are input to this correction processing unit 19.

[0110] As described in the first embodiment, when 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 wire, 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 magnetic sensor 20D is corrected using the output signal of the acceleration sensor 16, so that a single magnetic sensor 20D can be used to detect defects in the wire rope 61 while eliminating the effects of vibration.

[0114] Except for the above-mentioned points, 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 provided 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 movable relative to the moving handrail 6 in the extension direction 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 vibration.

[0116] In the tensile body inspection device 1D of the fifth embodiment, a plurality of magnetic sensors may be provided as described in the first embodiment. In addition, the magnetizers 41 and 42 having the permanent magnets 41a and 42a 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 body to be inspected is the wire rope 61 of the moving handrail 6 of a passenger conveyor has been described, but as described below, inspection of other tensile bodies is also possible. In the following, inspection of various tensile bodies using the tensile body inspection device 1 of the first embodiment will be described.

[0118] <Belt rope inspection> 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 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 rope 71 extends in the Y direction and a plurality of belt ropes 71 are arranged 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] A first magnetic sensor 20 and a second magnetic sensor 30, which are multiple magnetic sensors, face a 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 disposed 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, so that it is possible to eliminate the influence of vibration and accurately detect defects in the belt rope 71.

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

[0125] The tire 8 has a rubber base 80, a plurality of carcasses 81 forming the framework of the tire 8, a belt 82 which is a reinforcing band, and a pair of beads 83 (FIG. 15) which 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 ends 81a 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 ends 81a 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 body 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 relatively moved 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 crossing the carcass 81, i.e., the X direction.

[0130] A first magnetic sensor 20 and a second magnetic sensor 30, which are multiple magnetic sensors, face a tire 8, which is an object including a carcass 81 as a tensile body, 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 disposed with a distance D between them in the Y direction.

[0131] Although FIG. 14 and FIG. 15 show the control device 15 together with the housing 11, the control device 15 may be disposed 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, so that it is possible to eliminate the influence of vibration and accurately detect defects in the carcass 81.

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

[0136] A first magnetic sensor 20 and a second magnetic sensor 30, which are multiple magnetic sensors, face a tire 8, which is an object including a belt 82 as a tensile body, 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 disposed 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 disposed 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, and therefore can eliminate the influence of vibration and accurately detect defects in the belt 82.

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

[0140] In FIG. 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 set to the direction crossing 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, and therefore can eliminate the influence of vibration and accurately detect 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 making it possible to further improve detection accuracy.

[0144] 19 is a cross-sectional view showing another example of the relative position of the tensile member 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 set to the direction crossing 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, and therefore can eliminate the influence of vibration and accurately detect 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 circumferential 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 larger, and the detection accuracy can be further improved.

[0148] <Inspection of rebars in concrete structures> 20 is a perspective view showing a method for inspecting reinforcing bars 91 of 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 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 with the tensile body 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 set to the direction crossing the reinforcing bar 91, i.e., the X direction.

[0151] A first magnetic sensor 20 and a 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 disposed with a distance 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, so that it is possible to eliminate the influence of vibration and accurately detect defects in the reinforcing bar 91.

[0153] Also, the reinforcing bars 92 can 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 including the reinforcing bars 92 as tensile 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. Also, the first magnetic sensor 20 and the second magnetic sensor 30 are arranged with a distance D between them in the X direction.

[0154] Here, a case has been described in which 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 apparatus 1 of embodiment 1 have been described, but the present invention is not limited to the tensile body inspection apparatus 1 of embodiment 1, and the tensile body inspection apparatuses 1A to 1D of embodiments 2 to 5 may also be used.

[0156] Moreover, the tensile body inspection devices 1 to 1D according to 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. [Explanation of symbols]

[0158] 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 member), 82 Belt (tension member), 91,92 Steel bar (tension member).

Claims

1. An inspection device for an object including a tension body, the object being movable in an extension direction of the tension body and having a predetermined vibration period, comprising: A plurality of magnetic sensors facing the object and arranged in the direction of the movement at intervals longer than a length obtained by multiplying the vibration period by a speed of the 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 movement, and detects defects in the tension member based on a waveform obtained by cutting 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 member is provided in front of the magnetic sensor in the direction of 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.

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