CN113325066A - Wire inspection system and wire inspection device - Google Patents
Wire inspection system and wire inspection device Download PDFInfo
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- 238000007689 inspection Methods 0.000 title claims abstract description 107
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- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000011156 evaluation Methods 0.000 claims description 27
- 230000005540 biological transmission Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 10
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B31/00—Accessories for escalators, or moving walkways, e.g. for sterilising or cleaning
- B66B31/02—Accessories for escalators, or moving walkways, e.g. for sterilising or cleaning for handrails
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Abstract
The invention aims to suppress the influence of noise and inspect the state of a magnetic metal wire built in a lifter with high precision. The line inspection system includes: a plurality of coil/magnetic sensor units each including a first oscillation coil and a second oscillation coil that are arranged along an extension direction of a magnetic wire on a surface facing the magnetic wire of an inspection object and generate mutually opposite alternating magnetic fields, and a magnetic sensor that outputs, as inspection data, a magnetic field signal waveform based on a leakage magnetic field received from the first oscillation coil and the second oscillation coil; a plurality of signal generators that generate alternating currents of mutually different signal frequencies; a current output circuit that supplies the alternating current generated by the signal generator to the first oscillation coil and the second oscillation coil of the corresponding coil/magnetic sensor unit; and a detection unit that detects the inspection data output from the magnetic sensor at the signal frequency of the corresponding signal generator.
Description
Technical Field
The present invention relates to a wire inspection system and a wire inspection apparatus for inspecting a state of a magnetic wire incorporated in an elevator.
Background
Conventionally, there is a technique described in japanese patent No. 6211166 (patent document 1) for inspecting the state of a magnetic wire incorporated in an elevator. This publication describes the following: "on the bottom surface, a plurality of coil groups are provided with a shift in the width direction of the steel cord 3, and the coil groups are arranged in a row in the longitudinal direction of the oscillating coil (1), the oscillating coil (2) and the receiving coil positioned in the middle or in the vicinity of the middle of the oscillating coil and the oscillating coil, which generate mutually opposite alternating magnetic fields, thereby generating inspection data relating to the deterioration of the steel cord 3 of the handrail 1 incorporated in the passenger conveyor at a high SN ratio without using a permanent magnet (accordingly, the size and cost can be reduced).
Documents of the prior art
Patent document 1: japanese patent No. 6211166
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, an alternating-current magnetic field is generated at a predetermined frequency, and inspection data relating to deterioration of a steel cord incorporated in a handrail is generated. However, if there is a device that generates a magnetic field of the same frequency in the surroundings, the magnetic field in the surroundings is mixed as noise, which reduces the accuracy of the inspection.
For example, in a system for the purpose of merchandise management and theft prevention (Electronic Article Surveillance system), a device for stably generating a magnetic field may be installed at an entrance of a store. Further, since it is not rare that the entrance of the store is located near the escalator, it is important how to reduce the influence from the system.
Such a problem occurs not only in escalators but also in other elevators such as elevators. In an elevator, a wire rope suspending a car corresponds to a magnetic wire incorporated in an elevator. Further, a device that performs horizontal movement by using the mechanism of the elevator is included in the elevator. For example, a passenger conveyor that transports passengers in a horizontal direction by the same mechanism as an escalator is treated as one type of elevator.
Accordingly, an object of the present invention is to suppress the influence of noise and to inspect the state of a magnetic wire incorporated in an elevator with high accuracy.
Means for solving the problems
In order to achieve the above object, one of a line inspection system and a line inspection apparatus according to the present invention is typically characterized by comprising: a plurality of coil/magnetic sensor units each including: a first oscillation coil and a second oscillation coil which are disposed along an extension direction of the magnetic wire on a surface of the inspection object facing the magnetic wire and generate alternating magnetic fields in opposite directions to each other, and a magnetic sensor which is located at or near a middle of the first oscillation coil and the second oscillation coil and outputs a magnetic field signal waveform based on a leakage magnetic field received from the first oscillation coil and the second oscillation coil as inspection data; a plurality of signal generators provided in correspondence with the plurality of coil/magnetic sensor units, and generating alternating currents of different signal frequencies; a current output circuit that supplies the alternating current generated by the signal generator to the first oscillation coil and the second oscillation coil of the corresponding coil/magnetic sensor unit; and a detection unit that detects the inspection data output from the magnetic sensor at a signal frequency of the corresponding signal generator.
Effects of the invention
According to the present invention, the state of the magnetic wire incorporated in the elevator can be inspected with high accuracy while suppressing the influence of noise. Problems, structures, and effects other than those described above will be apparent from the following description of the embodiments.
Drawings
Fig. 1 is a configuration diagram showing the configuration of a line inspection system according to embodiment 1.
Fig. 2 is an explanatory diagram of the coil unit.
Fig. 3 is an explanatory diagram of the principle of the inspection.
Fig. 4 is a circuit configuration diagram showing a circuit configuration of a control circuit of the line inspection apparatus.
Fig. 5 is a flowchart showing the processing steps of the line inspection system.
Fig. 6 is a flowchart showing details of the evaluation process.
Fig. 7 shows a specific example of a display screen of the evaluation result.
Fig. 8 is a circuit configuration diagram of a control circuit of the line inspection device of embodiment 2.
Fig. 9 shows a specific example of modulation that can be used in the line inspection system.
Fig. 10 shows a specific example of a setting screen for modulation.
Fig. 11 is a flowchart showing the processing procedure of the line inspection system in embodiment 2.
Description of the reference numerals
10: line inspection system, 20: line inspection device, 21: signal generator, 22: coil unit, 23: detection unit, 25, control circuit, 30: evaluation device, L1: first oscillating coil, L2: second oscillating coil, L3: and a receiving coil.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings.
[ example 1 ]
Fig. 1 is a configuration diagram showing the configuration of the line inspection system of embodiment 1. As shown in fig. 1, the line inspection system 10 includes a line inspection apparatus 20 and an evaluation apparatus 30. The line inspection apparatus 20 includes a plurality of coil units 22, a plurality of signal generators 21 corresponding to the plurality of coil units 22, and a plurality of detectors 23 corresponding to the plurality of coil units 22.
The coil unit 22 is provided with a first oscillation coil, a second oscillation coil, and a receiving coil inside the coil unit 22, which will be described in detail later. The receiving coil functions as a magnetic sensor that detects a leakage magnetic field received from the first oscillation coil and the second oscillation coil. The coil unit 22 thus corresponds to the coil/magnetic sensor unit in the patented solution.
The plurality of signal generators 21 generate alternating currents of different signal frequencies, and supply the alternating currents to the first oscillation coils and the second oscillation coils of the corresponding coil units 22. A path from the signal generator 21 to the coil unit 22 is a current output circuit.
The first oscillation coil and the second oscillation coil of the coil unit 22 oscillate by the alternating current supplied from the signal generator 21, and generate an alternating magnetic field. When the coil unit 22 is opposed to the handrail of the escalator, the coil unit 22 is opposed to a steel cord (magnetic wire) incorporated in the handrail, and the generated magnetic field is affected by the steel cord. Therefore, the inspection data obtained by the reception of the magnetic field by the receiver coil indicates the state of the steel cord.
The inspection data received by the receiving coil is detected by the detector 23 and output to the evaluation device 30. The evaluation device 30 can use a plurality of inspection data output from the plurality of detectors 23 for evaluation of the steel cord.
For example, if EAS is present in the vicinity of an escalator and the frequency of the magnetic field generated by the EAS is close to the frequency of the signal generated by any one of the signal generators 21, noise is mixed into the inspection data at that frequency and the SN ratio (signal-to-noise ratio) is lowered. However, since the line inspection apparatus 20 generates a plurality of signal frequencies and generates inspection data for each signal frequency, by selecting inspection data having a relatively small influence of noise, it is possible to reduce the influence of noise and evaluate the state of the magnetic metal line with high accuracy.
Fig. 2 is an explanatory diagram of the coil unit 22. In fig. 2, the wire inspecting apparatus 20 includes 3 coil units 22, that is, a coil unit 22a, a coil unit 22b, and a coil unit 22 c. Each coil unit 22 includes a first oscillation coil L1, a second oscillation coil L2, and a reception coil L3.
The first oscillation coil L1 and the second oscillation coil L2 are disposed along the extending direction of the armrest on the surface facing the armrest, and generate mutually opposite alternating magnetic fields. The extending direction of the handrail is the same as that of the built-in steel cord.
The receiver coil L3 is located between the first oscillation coil L1 and the second oscillation coil L2, and outputs a magnetic field signal waveform based on the leakage magnetic field received from the first oscillation coil L1 and the second oscillation coil L2 as inspection data. The receiver coil L3 may be disposed not in the middle between the first oscillator coil L1 and the second oscillator coil L2, but in the vicinity of the middle.
In fig. 2, the coil unit 22a and the coil unit 22b are arranged in the width direction of the armrest, and the coil unit 22c is arranged at the center in the width direction of the armrest, so that the entire width of the armrest is located inside any one of the oscillation coils. Therefore, if the handrail is driven for 1 circumference, the entire handrail can be inspected.
Fig. 3 is an explanatory diagram of the principle of the inspection. First, as shown in fig. 3, the first oscillation coil L1, the receiving coil L3, and the second oscillation coil L2 of the coil unit 22 are arranged in a line in the extending direction (lateral direction in fig. 3) of the inspection object M at a position facing the inspection object M.
The first oscillation coil L1 and the second oscillation coil L2 generate mutually opposite alternating magnetic fields.
The receiver coil L3 is located between the first oscillation coil L1 and the second oscillation coil L2, and outputs a magnetic field waveform based on the magnetic field received from the first oscillation coil L1 and the second oscillation coil L2 as inspection data.
Magnetic lines of force B1, B2, B3 generated from the first oscillation coil L1 pass through the inspection object M, but leak from the inspection object M and return to the first oscillation coil L1. At this time, the size of the lines of magnetic force B1, B2, B3 returning to the first oscillation coil L1 depends on the sectional area and height h of the inspection object M (the distance from the inspection object M to the first oscillation coil L1). Further, the magnetic force becomes stronger as the coil approaches the first oscillation coil L1, and therefore the magnitude relationship of the strength of the magnetic lines of force B1, B2, and B3 is B1 > B2 > B3.
Similarly, magnetic lines of force B11, B12, and B13 generated from the second oscillation coil L2 pass through the inspection object M, but leak from the inspection object M and return to the second oscillation coil L2. The strength of the magnetic lines of force B11, B12, and B13 is in the relationship of B11 > B12 > B13.
Here, the upward direction in fig. 1 is defined as the positive direction of the magnetic force. The intensity of the ac magnetic field generated by the first oscillation coil L1 and the intensity of the ac magnetic field generated by the second oscillation coil L2 are equal to each other. In addition, a case where the magnetic field generated from the first oscillation coil L1 is generated in a direction passing through the inside thereof downward and the magnetic field generated from the second oscillation coil L2 is generated in a direction passing through the inside thereof upward at a certain moment will be considered below.
At this time, at the position between the first oscillation coil L1 and the receiving coil, the magnetic line of force B1 and the magnetic line of force B13 cancel each other out, but since the magnetic line of force B1 is stronger (B1+ B13 > 0), upward magnetic lines of force remain.
In addition, at the position between the second oscillation coil L2 and the receiving coil, the magnetic line of force B3 and the magnetic line of force B11 cancel each other out, but since the magnetic line of force B11 is stronger (B3+ B11 < 0), downward magnetic lines of force remain.
In the receiver coil, the magnetic flux B2 and the magnetic flux B12 cancel each other out, and the magnetic flux B2 and the magnetic flux B12 have the same strength (B2+ B12 is 0), so that no magnetic flux remains. Therefore, if the inspection object M is normal (if there is no degradation such as a break), no current is generated in the receiving coil.
Here, a case where the test object M is broken will be described. Hereinafter, the magnetic flux "B2 + B12" linked with the reception coil is represented by Φ.
If a break occurs in the test object M at a position between the first oscillation coil L1 and the receiving coil, the magnetic flux Φ < 0 is generated from the first oscillation coil L1 and passes through the magnetic lines of force in the test object M, and largely extends upward from the broken portion.
In addition, if there is a break in the inspection object M at a position directly below the receiving coil, the magnetic flux Φ becomes 0.
In addition, if there is a break in the inspection object M at a position between the receiving coil and the second oscillation coil L2, the magnetic flux Φ > 0.
Therefore, if the test object with a break is moved from the first oscillation coil L1 side to the second oscillation coil L2 side for testing, a waveform in which the magnetic flux Φ changes in the order of zero, negative, zero, positive, and zero is obtained.
Therefore, based on the temporal change in the current (magnetic field waveform) output from the receiving coil, a deteriorated portion such as a break in the inspection object M can be specified. That is, the magnetic field waveform output from the receiving coil is significantly vertical at the deteriorated portion of the inspection object M. Therefore, by using such a configuration and principle, it is possible to generate inspection data relating to deterioration of the inspection object M with a high SN ratio without using a permanent magnet in particular.
Further, if the intensities of the alternating-current magnetic fields generated by the first oscillation coil L1 and the second oscillation coil L2 are equal, when the position of the receiving coil is shifted from the middle thereof to one direction, the magnetic flux Φ interlinked with the receiving coil does not become 0 even if the inspection object M is normal (even if there is no deterioration such as breakage). However, even when the position of the receiver coil is deviated from the middle thereof to one of them, one of the ac magnetic fields generated by the first oscillator coil L1 and the second oscillator coil L2 can be adjusted to be stronger than the other (the magnetic flux Φ is set to 0) so long as it is within the range of the limit of amplification or processing of the current output from the receiver coil. Therefore, the receiving coil does not have to be arranged exactly in the middle between the first oscillation coil L1 and the second oscillation coil L2, and may be arranged in the vicinity of the middle. In addition, when the position of the receiving coil is slightly shifted from the middle of the receiving coil, effective inspection data can be obtained even if the intensity of the ac magnetic field generated in the first oscillation coil L1 and the second oscillation coil L2 is kept equal (magnetic flux Φ ≈ 0).
Fig. 4 is a circuit configuration diagram showing a circuit configuration of a control circuit of the line inspection apparatus 20. As shown in fig. 4, the control circuit 25 is composed of a controller, a buffer, a DDS (Direct Digital Synthesizer), a High Pass Filter (HPF), a Low Pass Filter (LPF), an amplifier, a lock-in amplifier, an analog-to-Digital converter (ADC), and the like.
The buffer receives and holds a signal indicating a measurement result from an encoder that measures a relative movement distance of the linear inspection device 20 with respect to the handrail, and supplies the signal to the controller. The relative movement distance with respect to the armrest can be expressed by the inspection data regarding the position in the extending direction of the armrest by correlating with the detection result. That is, the encoder corresponds to the drive amount detecting unit in the claim.
The DDS operates as a signal generator 21 that outputs a signal of a frequency specified by the controller. In fig. 4, 3 DDSs are connected to the controller. Each DDS is connected to the oscillation coil (first oscillation coil and second oscillation coil) of the corresponding coil unit 22 via the HPF and 2 amplifiers, and an alternating current is supplied to the oscillation coil.
On the other hand, the magnetic field signal waveform received by the reception coil is input to the ADC via the amplifier, the HPF, the amplifier, the lock-in amplifier, and the LPF in this order, converted into a digital signal by the ADC, and input to the controller. An amplifier, an HPF, an amplifier, a lock-in amplifier, and an LPF are provided for each reception coil. In this path, the lock-in amplifier operates as the detector 23.
The controller specifies the frequency of each DDS and instructs the start and end of oscillation. The inspection data of each receiving coil input as a digital signal from the ADC is output to the evaluation device 30 in association with the relative movement distance with respect to the armrest acquired from the encoder.
Fig. 5 is a flowchart showing the processing steps of the line inspection system 10. First, the line inspection device 20 performs excitation output and start of an encoder operation (step S101). Specifically, the start of the excitation output is the start of the operation of the signal generator 21. The start of the encoder operation is the start of the measurement of the relative movement distance by the encoder.
Next, the handrail driving is started (step S102), and the process proceeds to step S103. The start of the driving of the handrail may be, for example, a control instruction transmitted from the evaluation device 30 or the like. Further, if the handrail is driven under the control of another system or the like, the process of step S102 may be a process of detecting the start of driving of the handrail. Alternatively, step S102 may be omitted and the process may proceed to step S103.
In step S103, the receiving coil L3 of each coil unit 22 acquires the magnetic field signal waveform as inspection data, and acquires the signal detected by the detector 23. The evaluation device 30 performs evaluation processing of the detected inspection data (step S104), displays and outputs the evaluation result (step S105), and ends the processing.
Fig. 6 is a flowchart showing details of the evaluation process. As shown in fig. 5, the evaluation device 30 detects a signal from a plurality of inspection data from a plurality of receiving coils L3 (step S201), and determines the SN ratio (step S202). If there is inspection data whose SN ratio is smaller than the reference (yes in step S203), the evaluation device 30 removes the corresponding inspection data from the evaluation target (step S204).
After step S204, or when there is no inspection data having an SN ratio smaller than the reference (no in step S203), the evaluation device 30 calculates the crest factor of the amplitude in the signal (step S205).
If the crest factor does not exceed the threshold value (NO at step S206), the evaluation device 30 determines that the handrail is not abnormal (step S207), and returns to the original processing. On the other hand, if the crest factor exceeds the threshold value (step S206: YES), the evaluation device 30 determines that there is an abnormality in the corresponding portion of the armrest (step S208), and returns to the original processing.
Fig. 7 shows a specific example of a display screen of the evaluation result. In fig. 7, the date and time of inspection, the product number, the judgment, the abnormal position, and the inspection data are displayed. Specifically, the amplitude variation of the data was examined at a position of 8m of the armrest, and it was determined that there was an abnormality.
As described above, the line inspection apparatus 20 of embodiment 1 includes a plurality of coil/magnetic sensor units each including: the inspection apparatus includes a first oscillation coil, a second oscillation coil, and a magnetic sensor, wherein the first oscillation coil and the second oscillation coil are disposed along an extension direction of a magnetic wire on a surface facing the magnetic wire of an inspection object, the magnetic sensor is positioned at or near a middle of the first oscillation coil and the second oscillation coil to generate mutually opposite alternating magnetic fields, and outputs a magnetic field signal waveform based on a leakage magnetic field received from the first oscillation coil and the second oscillation coil as inspection data. The wire inspection device 20 further includes: a plurality of signal generators provided corresponding to the plurality of coil/magnetic sensor units, and generating alternating currents of different signal frequencies; a current output circuit that supplies the alternating current generated by the signal generator to the first oscillation coil and the second oscillation coil of the corresponding coil/magnetic sensor unit; and a detection unit that detects the inspection data output from the magnetic sensor at the signal frequency of the corresponding signal generator.
With this configuration, the wire inspecting apparatus 20 can accurately inspect the state of the magnetic wire incorporated in the elevator while suppressing the influence of noise.
The evaluation device 30, which is an evaluation unit connected to the wire inspection device 20 and constitutes the wire inspection system 10, evaluates the state of the magnetic wire using a plurality of detection results obtained from the magnetic sensors of the plurality of coil/magnetic sensor units, respectively. Further, since the evaluation device 30 determines the detection result to be used for evaluation based on the signal-to-noise ratios of the plurality of detection results, evaluation can be performed using the evaluation result that is not affected by noise.
The wire inspection device 20 further includes an encoder as a drive amount detection unit that detects the drive amount of the magnetic wire, and detects the drive amount during the driving of the magnetic wire to correlate the detection result with the drive amount, thereby outputting the inspection result for each position in the extension direction of the magnetic wire.
[ example 2 ]
In embodiment 2, a configuration in which modulation is applied to a signal frequency will be described.
Fig. 8 is a circuit configuration diagram of a control circuit of the line inspection device of embodiment 2. The control circuit 125 shown in fig. 8 further includes a DDS for a transmission frequency, and an output of the DDS for a signal frequency and an output of the DDS for a transmission frequency are input to the modulation circuit. Then, the output of the modulation circuit is configured to supply an alternating current to the oscillation coils (first oscillation coil and second oscillation coil) of the corresponding coil unit 22 via the HPF and 2 amplifiers.
The magnetic field signal waveform received by the reception coil is input to the ADC via an amplifier, an HPF, an amplifier, a demodulation circuit, an LPF, an HPF, an amplifier, a lock-in amplifier, and an LPF in this order.
The other structures are the same as those in fig. 4, and therefore, the description thereof is omitted.
Fig. 9 shows a specific example of modulation that can be used by the line inspection system 10. In fig. 9, Amplitude Modulation (AM), frequency Modulation (FSK), and Phase Modulation (PSK) are shown.
In amplitude modulation, the signal generator 21 generates a signal frequency and a frequency of the carrier wave 1, and obtains an amplitude modulation waveform by varying the amplitude of the frequency of the carrier wave 1 in a cycle of the signal frequency.
In FSK, the signal generator 21 generates a signal frequency, a frequency of the carrier 1, and a frequency of the carrier 2, and switches the carrier 1 and the carrier 2 at a cycle of the signal frequency, thereby obtaining an FSK waveform.
In PSK, signal generator 21 generates a signal frequency and the frequency of carrier 1, and switches the phase of carrier 1 at the cycle of the signal frequency, thereby obtaining a PSK waveform.
Fig. 10 shows a specific example of a setting screen for modulation. In the setting screen shown in fig. 10, AM, FSK, PSK, or a single excitation method can be selected. When a single carrier is selected, the operation is the same as that of embodiment 1 without generating and modulating a carrier.
In the setting screen shown in fig. 10, the carrier 1 frequency, the carrier 2 frequency, the carrier 1 phase, the carrier 2 phase, the signal frequency, the signal phase, and the excitation output can be set for each coil unit 22. The carrier 2 frequency setting is used when frequency modulation is performed. Similarly, the carrier phase setting is used when performing phase modulation.
In the setting screen shown in fig. 10, the input gain, the lock gain, and the output gain can be set as the entire setting.
Fig. 11 is a flowchart showing the processing procedure of the line inspection system in embodiment 2. In this processing flow, first, the line inspection system receives selection of the excitation method on the setting screen shown in fig. 10 (step S301), and sets a numerical value for each excitation method (step S302). The subsequent steps S303 to S307 are the same as steps S101 to S105 shown in fig. 5. That is, in embodiment 2, various settings relating to modulation are performed, and the signal wave is modulated in accordance with the settings to excite the oscillation coil.
As described above, in embodiment 2, by modulating the signal frequency, the influence of noise from EAS or the like can be suppressed, and the state of the magnetic wire incorporated in the elevator can be inspected with high accuracy.
Specifically, in example 2, the signal generator 21 generates not only the alternating current of the signal frequency but also the alternating current of the transmission frequency, and performs amplitude modulation in which the amplitude of the transmission frequency is varied in a cycle of the signal frequency, thereby enabling the first oscillation coil and the second oscillation coil to be excited.
The signal generator 21 generates not only an alternating current of a signal frequency but also an alternating current of a first transmission frequency and an alternating current of a second transmission frequency, and performs frequency modulation in which the first transmission frequency and the second transmission frequency are switched at a cycle of the signal frequency, thereby exciting the first oscillation coil and the second oscillation coil.
The signal generator 21 generates not only an alternating current of a signal frequency but also an alternating current of a transmission frequency, and performs phase modulation in which the phase of the transmission frequency is switched in a cycle of the signal frequency, thereby exciting the first oscillation coil and the second oscillation coil.
As described above, the line inspection system according to embodiment 2 can use any modulation scheme for modulating the signal frequency, and can be configured to be appropriately selected from a plurality of modulation schemes. Further, various parameters including the signal frequency and the transmission frequency can be appropriately changed to inspect the magnetic metal wire.
In the above-described embodiment, the case where 3 coil units are provided has been described as an example, but the number and arrangement of the coil units are not limited to the above-described embodiment and can be changed as appropriate.
In the above-described embodiment, the case where the inspection of the steel cord provided inside the handrail of the elevator is performed is described as an example, but the present invention can also be applied to a passenger conveyor that transports passengers in the horizontal direction. In addition, the present invention can also be applied to inspection of a wire rope suspending a car of an elevator.
The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are described in detail to explain the present invention easily and understandably, and are not limited to having all the configurations described. The structure is not limited to deletion, and replacement and addition of the structure can be performed.
Claims (9)
1. A wire inspection system for inspecting a state of a magnetic wire incorporated in an elevator, comprising:
a plurality of coil/magnetic sensor units each including: a first oscillation coil and a second oscillation coil which are disposed along an extension direction of the magnetic wire on a surface of the inspection object facing the magnetic wire and generate alternating magnetic fields in opposite directions to each other, and a magnetic sensor which is located at or near a middle of the first oscillation coil and the second oscillation coil and outputs a magnetic field signal waveform based on a leakage magnetic field received from the first oscillation coil and the second oscillation coil as inspection data;
a plurality of signal generators provided in correspondence with the plurality of coil/magnetic sensor units, and generating alternating currents of different signal frequencies;
a current output circuit that supplies the alternating current generated by the signal generator to the first oscillation coil and the second oscillation coil of the corresponding coil/magnetic sensor unit; and
and a detection unit that detects the inspection data output from the magnetic sensor at a signal frequency of the corresponding signal generator.
2. The line inspection system of claim 1,
the wire inspection system further includes an evaluation unit that evaluates a state of the magnetic wire using a plurality of detection results obtained from the magnetic sensors of the plurality of coil/magnetic sensor units,
the evaluation unit determines a detection result to be used for the evaluation based on a signal-to-noise ratio of the plurality of detection results.
3. The line inspection system of claim 1,
the magnetic wire is a steel cord disposed inside a handrail in a passenger conveyor.
4. The line inspection system of claim 1,
the magnetic metal wire is a wire rope suspending a car of an elevator.
5. The line inspection system of claim 1,
the plurality of signal generators generate not only an alternating current at the signal frequency but also an alternating current at the delivery frequency,
the plurality of coil/magnetic sensor units perform amplitude modulation for varying the amplitude of the transmission frequency in a cycle of the signal frequency, and excite the first oscillation coil and the second oscillation coil.
6. The line inspection system of claim 1,
the plurality of signal generators generate not only alternating currents at the signal frequency but also alternating currents at a first delivery frequency and alternating currents at a second delivery frequency,
the plurality of coil/magnetic sensor units perform frequency modulation for switching the first transmission frequency and the second transmission frequency in a cycle of the signal frequency, and excite the first oscillation coil and the second oscillation coil.
7. The line inspection system of claim 1,
the plurality of signal generators generate not only an alternating current at the signal frequency but also an alternating current at the delivery frequency,
the plurality of coil/magnetic sensor units perform phase modulation in which the phase of the transmission frequency is switched at a cycle of the signal frequency, and excite the first oscillation coil and the second oscillation coil.
8. The line inspection system of claim 1,
the wire inspection system further includes a drive amount detection unit for detecting a drive amount of the magnetic wire,
the detection unit detects the magnetic wire during driving and correlates the detection result with the driving amount, thereby outputting the inspection result for each position in the direction of elongation of the magnetic wire.
9. A wire inspection device for inspecting a state of a magnetic wire incorporated in an elevator, comprising:
a plurality of coil/magnetic sensor units each including: a first oscillation coil and a second oscillation coil which are disposed along an extension direction of the magnetic wire on a surface of the inspection object facing the magnetic wire and generate alternating magnetic fields in opposite directions to each other, and a magnetic sensor which is located at or near a middle of the first oscillation coil and the second oscillation coil and outputs a magnetic field signal waveform based on a leakage magnetic field received from the first oscillation coil and the second oscillation coil as inspection data;
a plurality of signal generators provided in correspondence with the plurality of coil/magnetic sensor units, and generating alternating currents of different signal frequencies;
a current output circuit that supplies the alternating current generated by the signal generator to the first oscillation coil and the second oscillation coil of the corresponding coil/magnetic sensor unit; and
and a detection unit that detects the inspection data output from the magnetic sensor at a signal frequency of the corresponding signal generator.
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| JP2020-034410 | 2020-02-28 | ||
| JP2020034410A JP7341922B2 (en) | 2020-02-28 | 2020-02-28 | Wire inspection system and wire inspection equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08304349A (en) * | 1995-05-12 | 1996-11-22 | Tawara Takako | Magnetic sensor system |
| JPH10282062A (en) * | 1997-04-02 | 1998-10-23 | Hitachi Building Syst Co Ltd | Damage defector of handrail for passenger conveyor |
| CN102818479A (en) * | 2012-08-29 | 2012-12-12 | 长沙理工大学 | Online cleaning robot based on wireless power supplying and magnetic-induction positioning for condensers |
| CN105905719A (en) * | 2015-02-23 | 2016-08-31 | 株式会社日立大厦系统 | Elevator position detecting device and elevator with same |
| CN106315350A (en) * | 2015-07-02 | 2017-01-11 | 株式会社日立大厦系统 | Rope inspection device and rope inspection system |
| JP2017088411A (en) * | 2016-12-05 | 2017-05-25 | 株式会社日立ビルシステム | Handrail inspection device and handrail inspection system |
| JP2018004555A (en) * | 2016-07-07 | 2018-01-11 | 株式会社日立ビルシステム | Inspection system for handrail and inspection method for handrail |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017351A (en) * | 1983-07-08 | 1985-01-29 | Sumitomo Metal Ind Ltd | Method and apparatus for detecting surface flaw |
| US6553838B2 (en) | 2000-08-25 | 2003-04-29 | Em-Tech Llc | Detection of anomalies on railroad tracks |
| JP6017351B2 (en) | 2013-03-04 | 2016-10-26 | 山陽特殊製鋼株式会社 | Lead-free bonding material |
| JP2017013974A (en) * | 2015-07-02 | 2017-01-19 | 株式会社日立ビルシステム | Handrail inspection device and handrail inspection system |
| JP6551885B2 (en) * | 2015-10-03 | 2019-07-31 | 国立大学法人 岡山大学 | Nondestructive inspection device and nondestructive inspection method |
| JP6681069B2 (en) * | 2016-10-24 | 2020-04-15 | 国立大学法人 岡山大学 | Magnetic nondestructive inspection method and magnetic nondestructive inspection apparatus |
| JP6768486B2 (en) | 2016-12-21 | 2020-10-14 | 株式会社日立ハイテクファインシステムズ | Rail inspection system |
-
2020
- 2020-02-28 JP JP2020034410A patent/JP7341922B2/en active Active
-
2021
- 2021-02-03 CN CN202110166006.6A patent/CN113325066A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08304349A (en) * | 1995-05-12 | 1996-11-22 | Tawara Takako | Magnetic sensor system |
| JPH10282062A (en) * | 1997-04-02 | 1998-10-23 | Hitachi Building Syst Co Ltd | Damage defector of handrail for passenger conveyor |
| CN102818479A (en) * | 2012-08-29 | 2012-12-12 | 长沙理工大学 | Online cleaning robot based on wireless power supplying and magnetic-induction positioning for condensers |
| CN105905719A (en) * | 2015-02-23 | 2016-08-31 | 株式会社日立大厦系统 | Elevator position detecting device and elevator with same |
| CN106315350A (en) * | 2015-07-02 | 2017-01-11 | 株式会社日立大厦系统 | Rope inspection device and rope inspection system |
| JP2018004555A (en) * | 2016-07-07 | 2018-01-11 | 株式会社日立ビルシステム | Inspection system for handrail and inspection method for handrail |
| JP2017088411A (en) * | 2016-12-05 | 2017-05-25 | 株式会社日立ビルシステム | Handrail inspection device and handrail inspection system |
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| Publication number | Publication date |
|---|---|
| JP7341922B2 (en) | 2023-09-11 |
| JP2021134081A (en) | 2021-09-13 |
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