JP7271866B2 - Magnetic inspection system and program - Google Patents

Description

The present invention relates to a magnetic material inspection system and program.

Conventionally, a magnetic material inspection system is known (see Patent Literature 1, for example).

The above Patent Document 1 discloses a wire rope inspection method comprising a detection coil that detects leakage magnetic flux of a wire rope (magnetic material) and transmits an inspection signal, and a control device that detects damage to the wire rope based on the inspection signal. An apparatus (magnetic material inspection system) is disclosed. The wire rope inspection device of Patent Document 1 inspects the wire rope while moving the wire rope with respect to the detection coil. Further, the control device is configured to issue a warning by turning on a lamp or sounding a buzzer when damage to the wire rope is detected during inspection.

WO2015/166533

In the wire rope inspection device (magnetic material inspection system) described in Patent Document 1, when damage to the wire rope is detected during inspection, a warning is generated by lighting a lamp or sounding a buzzer. When there is damage, it is necessary for the operator to stop moving the wire rope with respect to the coil based on a warning and mark the damaged position with chalk or the like. Therefore, there is a problem that the burden on the operator for identifying the damaged position of the wire rope increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and one object of the present invention is to suppress an increase in the burden on an operator for identifying the damaged position of a magnetic body. is to provide a magnetic material inspection system and program capable of

To achieve the above object, a magnetic material inspection system according to a first aspect of the present invention includes a detection coil wound around a magnetic material and configured to detect changes in the magnetic field of the magnetic material and transmit a detection signal. a detection unit for detecting the state of the magnetic material based on the detection signal from the detection coil; a display unit for displaying the state of the magnetic material; inspection position information of the magnetic material; and a control unit that associates the state with the inspection position information and displays it on the display unit, the control unit uses the horizontal axis of the waveform of the detection signal as the inspection position information, is associated with and displayed on the display unit, and the integration signal obtained by integrating the differential signal as the detection signal and the inspection position information are associated with each other and displayed on the display unit. there is

In the magnetic material inspection system according to the first aspect of the present invention, configured as described above, the operator can confirm the display on the display unit in which the state of the magnetic material and the inspection position information are displayed in association with each other. As a result, it is possible to easily specify the damaged position of the magnetic body, so that it is possible to suppress an increase in the burden on the operator for specifying the damaged position of the magnetic body. In addition, when performing an inspection while moving the magnetic body relative to the detection coil, even if there is damage, it is not necessary to stop the movement of the magnetic body relative to the detection coil. You can prevent it from getting longer.

In the magnetic material inspection system according to the first aspect, the control unit is preferably configured to associate information on the state of the magnetic material with inspection position information and store the information in the storage unit. According to this configuration, it is possible to compare the inspection result of the inspection with the previous inspection result stored in the storage unit, so that the temporal change of the magnetic material can be easily acquired. This makes it possible to accurately determine when to replace the magnetic material.

In the magnetic material inspection system according to the first aspect, preferably, the control unit displays, on the display unit, a display indicating the state of damage to the magnetic material in association with the inspection position information based on the magnitude of the detection signal. is configured to With this configuration, the operator can easily confirm the state and position of damage to the magnetic material based on the display on the display unit.

In the magnetic material inspection system according to the first aspect, preferably, the control unit is configured to display a threshold for determining the state of the magnetic material together with the waveform of the detection signal on the display unit. ing. With this configuration, the detection signal can be easily compared with the threshold value, so that the operator can easily check the state of the magnetic material.

In the magnetic material inspection system according to the first aspect, preferably, the control unit acquires the detection signal and the inspection position information in parallel, and associates the state of the magnetic material with the inspection position information. It is configured. With this configuration, it is possible to easily associate the state of the magnetic material with the inspection position information.

The magnetic material inspection system according to the first aspect preferably further includes a position acquisition unit for acquiring inspection position information, wherein the control unit controls the inspection position information acquired by the position acquisition unit and the detection signal. The state of the magnetic material and the inspection position information are associated with each other and displayed on the display unit. With this configuration, the inspection position can be easily acquired by the position acquiring unit, so that the state of the magnetic material and the inspection position information can be easily associated.

In the magnetic material inspection system according to the first aspect, preferably, the control unit displays the cumulative number of abnormal states to be notified according to the state of the magnetic material in association with the state of the magnetic material and the inspection position information. In addition, it is configured to be displayed on the display unit. With this configuration, the operator can easily recognize the number of abnormal states such as damage at the inspection position based on the display on the display unit.

In the magnetic material inspection system according to the first aspect, the magnetic material is preferably a wire rope formed of a plurality of strands. By configuring in this way, it is possible to suppress an increase in the burden on the operator for identifying the damaged position in the length direction of the wire rope. Moreover, even if some of the strands are broken, it is not necessary to stop the relative movement of the wire rope with respect to the detector coil, so it is possible to prevent the inspection time from becoming longer due to interruption of the inspection.

In order to achieve the above object, a program according to a second aspect of the present invention provides a detection signal for detecting a change in the magnetic field of a magnetic body, which is detected by a detection coil wound around the magnetic body; Based on the inspection position information, the horizontal axis of the waveform of the detection signal is displayed as inspection position information, and the state of the magnetic material and the inspection position information are associated with each other and displayed on the display unit, and the differential signal as the detection signal is displayed. The computer is caused to execute control for displaying the integrated signal and the inspection position information in association with each other on the display unit.

In the program according to the second aspect of the present invention, configured as described above, the operator can easily check the display section on which the state of the magnetic material and the inspection position information are displayed in association with each other. Since it is possible to specify the damaged position of the magnetic body, it is possible to provide a program capable of suppressing an increase in the burden on the operator for specifying the damaged position of the magnetic body. In addition, when performing an inspection while moving the magnetic body relative to the detection coil, even if there is damage, it is not necessary to stop the movement of the magnetic body relative to the detection coil. You can prevent it from getting longer.

ADVANTAGE OF THE INVENTION According to this invention, as mentioned above, it can suppress that the operator's burden for pinpointing the damaged position of a magnetic body increases.

1 is a schematic diagram showing the configuration of a magnetic material inspection system according to one embodiment; FIG. It is a figure for demonstrating the structure of the magnetic field application part of the magnetic material inspection apparatus by one Embodiment, and a detection part. It is the figure which showed the example of a display of the display part of the magnetic material inspection system by one Embodiment. It is a figure for demonstrating correlation with the detection signal and positional information of the magnetic material inspection system by one Embodiment. It is a figure for demonstrating the position acquisition part of the magnetic material inspection system by one Embodiment. FIG. 5 is a diagram for explaining the relationship between the position of the wire rope and the signal intensity when the position acquisition unit of the magnetic material inspection system according to one embodiment acquires the position; It is the graph which showed an example of the relationship of the time and signal strength at the time of position acquisition of the position acquisition part of the magnetic material inspection system by one Embodiment. It is a figure for demonstrating the position acquisition part of the 1st modification of the magnetic material inspection system by one Embodiment. It is a figure for demonstrating the position acquisition part of the 2nd modification of the magnetic body inspection system by one Embodiment.

Embodiments embodying the present invention will be described below with reference to the drawings.

A configuration of a magnetic material inspection system 100 according to an embodiment will be described with reference to FIGS. 1 to 4. FIG.

(Configuration of magnetic material inspection system)
As shown in FIG. 1, the magnetic material inspection system 100 is configured to inspect a magnetic wire rope W, which is an inspection target. A magnetic material inspection system 100 includes a magnetic material inspection apparatus 200 and a computer 300 . A position acquisition unit 201 is provided in the magnetic material inspection apparatus 200 . The computer 300 includes a communication section 301 , a control section 302 , a storage section 303 and a display section 304 . Wire ropes W are used for cranes, elevators, suspension bridges, robots, and the like. The magnetic material inspection system 100 is configured to inspect the wire rope W periodically. The magnetic material inspection system 100 is configured to inspect the wire rope W for damage. The magnetic material inspection system 100 inspects the wire rope W while relatively moving the magnetic material inspection apparatus 200 along the surface of the wire rope W, which is an inspection target. For example, when the wire rope W moves as in a crane or an elevator, inspection is performed as the wire rope W moves while the magnetic material inspection device 200 is fixed. In addition, when the wire rope W does not move like a suspension bridge, inspection is performed while moving the magnetic material inspection device 200 along the wire rope W. The wire rope W is arranged so as to move relatively in the X direction at the position of the magnetic material inspection device 200 . The wire rope W is an example of the "magnetic body" in the scope of claims.

The magnetic material inspection device 200 includes a detection section 1 and an electronic circuit section 2, as shown in FIG. The detector 1 includes a differential coil 10 having a pair of receiver coils 11 and 12 and an excitation coil 13 . The magnetic material inspection device 200 also includes a magnetic field application unit 3 . The electronic circuit section 2 is an example of the "detection section" in the scope of claims. Also, the differential coil 10 is an example of a "detection coil" in the scope of claims.

A magnetic material inspection apparatus 200 is connected to a computer 300 . The computer 300 is configured to receive measurement data of the wire rope W by the magnetic material inspection device 200 via the communication unit 301 . The control unit 302 of the computer 300 is configured to analyze the type of damage such as wire breakage and change in cross-sectional area. The computer 300 is also configured to display the analysis results on the display unit 304 . The computer 300 is also configured to store the analysis results in the storage unit 303 . Further, the computer 300 is configured to perform abnormality determination based on the analysis result and display the result on the display unit 304 .

The wire rope W is formed by weaving (for example, strand weaving) a plurality of magnetic strand materials. The wire rope W is a magnetic body made of a long material extending in the X direction. The wire rope W is monitored for its condition (presence or absence of scratches, etc.) in order to prevent breakage due to deterioration. Then, the wire rope W whose deterioration has progressed beyond a predetermined amount is replaced.

As shown in FIG. 2, the magnetic material inspection device 200 is configured to detect changes in the magnetic field (magnetic flux) of the wire rope W. As shown in FIG. The magnetic material inspection device 200 includes an all-flux sensor. That is, the magnetic material inspection device 200 detects substantially all of the magnetic flux passing through the wire rope W detection position.

The magnetic field applying unit 3 is configured to apply a magnetic field in advance to the wire rope W, which is an object to be inspected, to adjust the magnitude and direction of magnetization of the magnetic material. The magnetic field applying section 3 includes a first magnetic field applying section including magnets 31 and 32 and a second magnetic field applying section including magnets 33 and 34 . The first magnetic field applying section (magnets 31 and 32) is arranged on one side (X1 direction side) of the detecting section 1 in the direction in which the wire rope W extends. Further, the second magnetic field applying section (magnets 33 and 34) is arranged on the other side (the X2 direction side) of the direction in which the wire rope W extends with respect to the detecting section 1 .

As shown in FIG. 2, the differential coil 10 (receiving coils 11 and 12) and the excitation coil 13 extend along the longitudinal direction with the direction in which the wire rope W, which is a magnetic body made of a long material, extends as a central axis. are wound multiple times. In addition, the differential coil 10 and the excitation coil 13 are coils including conductor portions formed to be cylindrical along the X direction (longitudinal direction) in which the wire rope W extends. Therefore, the surfaces formed by the wire portions around which the differential coil 10 and the excitation coil 13 are wound are substantially perpendicular to the longitudinal direction. A wire rope W passes through the differential coil 10 and the excitation coil 13 . Also, the differential coil 10 is provided inside the excitation coil 13 . Note that the arrangement of the differential coils 10 and the excitation coils 13 is not limited to this. The receiving coil 11 of the differential coil 10 is arranged on the X1 direction side. Also, the receiving coil 12 of the differential coil 10 is arranged on the X2 direction side.

The excitation coil 13 excites the magnetization state of the wire rope W. As shown in FIG. Specifically, when an exciting alternating current is supplied to the exciting coil 13, a magnetic field generated based on the exciting alternating current is applied inside the exciting coil 13 along the X direction.

Differential coil 10 is configured to transmit a differential signal of a pair of receive coils 11 and 12 . Specifically, the differential coil 10 is configured to detect a change in the magnetic field of the wire rope W and transmit a differential signal. The differential coil 10 is configured to detect a change in the magnetic field of the wire rope W, which is an object to be inspected, in the X direction and output a detection signal (voltage). That is, the differential coil 10 detects changes in the magnetic field in the X direction with respect to the wire rope W to which the magnetic field is applied by the magnetic field applying section 3 . The differential coil 10 is also configured to output a differential signal (voltage) based on the detected change in the magnetic field of the wire rope W in the X direction. Further, the differential coil 10 is arranged so that substantially all of the magnetic field generated by the excitation coil 13 can be detected (input).

If the wire rope W has a defect (such as a flaw), the total magnetic flux (a value obtained by multiplying the magnetic field by the magnetic permeability and the area) of the wire rope W is reduced at the defective portion (such as the flaw). As a result, for example, when the receiving coil 11 is positioned at a location with a defect (such as a scratch), the amount of magnetic flux passing through the receiving coil 12 changes compared to that of the receiving coil 11, so that the voltage detected by the differential coil 10 changes. The absolute value of the difference (differential signal) increases. On the other hand, the differential signal is substantially zero in a portion without defects (scratches, etc.). Thus, in the differential coil 10, a clear signal (a signal with a good S/N ratio) representing the presence of defects (scratches, etc.) is detected. Thereby, the electronic circuit section 2 can detect the presence of a defect (such as a flaw) in the wire rope W based on the value of the differential signal.

The electronic circuit section 2 is configured to control each section of the magnetic material inspection device 200 . Specifically, the electronic circuit section 2 includes a processor such as a CPU (Central Processing Unit), a memory, an AD converter, and the like. The electronic circuit section 2 is configured to detect the state of the wire rope W by receiving a differential signal (detection signal) from the differential coil 10 . Further, the electronic circuit section 2 is configured to perform control to excite the excitation coil 13 . Further, the electronic circuit section 2 is configured to perform synchronous detection of the excitation coil signal and the detection coil signal. The electronic circuit section 2 is also configured to transmit the detection result of the state of the wire rope W to the computer 300 . Further, the electronic circuit section 2 is configured to receive inspection position information of the wire rope W by the magnetic material inspection apparatus 200 acquired by the position acquisition section 201 . The electronic circuit section 2 is also configured to transmit inspection position information to the computer 300 .

The position acquisition unit 201 is configured to acquire inspection position information. For example, the position acquisition unit 201 has a light emitting unit and a light receiving unit, and acquires the position of the wire rope W by reflecting the light emitted from the light emitting unit to the wire rope W and receiving it by the light receiving unit. do. Specifically, the position acquisition unit 201 acquires the position information of the wire rope W by acquiring the number of unevennesses of the wire rope W based on the intensity of the light received by the light receiving unit. That is, since the wire rope W is formed by weaving strands, the surface thereof has a cyclically uneven shape. The position acquisition unit 201 acquires position information of the wire rope W by counting the number of concave portions or convex portions of the periodic concave-convex shape. In addition, the intensity of the received light increases in the convex portions, and the intensity of the received light decreases in the concave portions. A specific configuration will be described later. In addition, when the inspection is performed while moving the magnetic material inspection apparatus 200, the position acquisition unit 201 has an acceleration sensor or GPS, and based on the acceleration or GPS position information, the inspection position of the wire rope W to get Also, when inspecting elevator wires, the location information of the wires may be sent to the computer 300 from the elevator system.

Here, in this embodiment, the state of the inspected wire rope W is displayed on the display unit 304 . Specifically, as shown in FIG. 3, the control unit 302 controls the state of the wire rope W and the inspection position information based on the inspection position information of the wire rope W and the detection signal of the differential coil 10. are associated with each other and displayed on the display unit. Specifically, based on the inspection position information acquired by the position acquisition unit 201 and the detection signal, the control unit 302 causes the display unit 304 to display the state of the wire rope W and the inspection position information in association with each other. is configured to Further, the control unit 302, based on a program, detects the state of the wire rope W and the inspection position information based on the detection signal for detecting the change in the magnetic field of the wire rope W and the inspection position information of the wire rope W. Displayed on the display unit 304 in association with each other.

Further, the control unit 302 is configured to store the information on the state of the wire rope W and the inspection position information in the storage unit 303 in association with each other. Saving to the storage unit 303 is performed, for example, for each examination. Thereby, the detection signals stored in the storage unit 303 can be compared at the same inspection position. For example, by taking the difference from the detection signal of the initial value, the amount of change over time from the time of the initial inspection can be obtained. Further, by taking the difference from the detection signal at the time of the previous inspection, it is possible to acquire the amount of change over time from the time of the previous inspection.

Further, the control unit 302 is configured to display, on the display unit 304, a display showing the damage state of the wire rope W in association with the inspection position information based on the magnitude of the detection signal. For example, based on the value of the detection signal, a display indicating "caution" or "warning" is displayed in association with the inspection position information. Also, a display indicating the type of damage such as "kink" or "disconnection" is displayed in association with the inspection position information. In the example shown in FIG. 3, the word "caution" and arrows indicate the state of damage. Further, detailed information is displayed by mousing over the display indicating the state of damage. Also, the color is changed and displayed according to the type of damage and progress.

The control unit 302 is also configured to display a threshold for determining the state of the wire rope W on the display unit 304 together with the waveform of the detection signal. Specifically, as shown in FIG. 3, lines of P1 and P2 as thresholds to be noted are displayed together with the waveform of the detection signal. In this case the difference between P1 and P2 is set to 5V. Along with the waveform of the detection signal, the lines of P3 and P4 are displayed as thresholds for warning. In this case the difference between P3 and P4 is set to 8V. Note that the threshold can be changed by the operator.

In the example shown in FIG. 3, the differential signal is displayed on the display unit 304 in association with the examination position information. Also, by switching the display, the integrated signal obtained by integrating the differential signal is displayed on the display unit 304 in association with the inspection position information. The integrated signal may be displayed in association with the inspection position information after integrating the differential signal for an appropriately set time, or may be displayed with an appropriately set length after associating the differential signal with the inspection position information. (Position) may be integrated. Thereby, the visibility of the displayed signal can be improved. Also, it is possible to easily determine the type of damage. For example, the integration signal in the case of kink has a smooth waveform, and the integration signal in the case of disconnection has a sharp waveform.

In addition, the control unit 302 causes the display unit 304 to display the cumulative number of abnormal states to be notified according to the state of the wire rope W together with the display that associates the state of the wire rope W with the inspection position information. is configured to Specifically, as shown in FIG. 3 , the cumulative points for “caution” and the cumulative points for “warning” are displayed on the display unit 304 . A threshold for the cumulative number of points is set by the operator. When the cumulative number of points exceeds the threshold, it is determined that the damage to the wire rope W has progressed. The display unit 304 also displays the rope feed speed, the current value of the detection level Vp, and the measurement span.

If the wire rope W is long, the detection signals at all inspection positions may not fit on one screen of the display unit 304 . In this case, by enlarging or reducing the waveform of the detection signal, it is possible to check the local waveform or the overall waveform. Also, the abnormal portions (damaged portions) may be sequentially displayed on the display section 304 .

When the excitation coil is not provided and the wire rope W is not excited, when DC excitation is performed instead of AC excitation, or when a fixed magnetic field is applied by a magnet, the signal level changes depending on the rope feed speed. In this case, the detection signal is corrected according to the rope speed and displayed on the display unit 304 in association with the inspection position information.

The control unit 302 is configured to acquire the detection signal and the inspection position information in parallel, and associate the state of the wire rope W with the inspection position information. Specifically, as shown in FIG. 4, the detection signal is sampled at predetermined time intervals. Thereby, the times T1, T2, T3, . . . and the detection levels V1, V2, V3, . Further, position information is obtained at predetermined time intervals. Thereby, the times T1, T2, T3, . . . are associated with the position information x1, x2, x3, . Position information x1, x2, x3, . . . and detection levels V1, V2, V3, . When time is converted into a position, the relative movement speed of the wire rope W is kept constant, and the movement time is multiplied by the speed. Alternatively, when converting time into position, the relative speed of the wire rope W is obtained moment by moment and converted by integrating the speed with time.

The latest detection signal is displayed on the display unit 304 . That is, when the wire rope W reciprocates and the detection signal is detected at the same position, new information is displayed on the display unit 304 . Further, when the relative movement of the wire rope W is stopped, the detection signal is not detected so that the same position of the wire rope W is not continuously inspected.

(Configuration of position acquisition unit)
As shown in FIG. 5 , the position acquisition section 201 includes a light emitting section 210 , a light receiving section 220 , a converging lens 231 , a half mirror 232 and an imaging lens 233 . The light receiving section 220 has a light receiving element 221 and an electronic circuit 222 . The position acquisition section 201 is provided to acquire position information of the wire rope W based on the intensity of light received by the light receiving section 220 .

Light emitting unit 210 has a semiconductor laser element that generates laser light of a predetermined wavelength (eg, 635 nm). The light emitting unit 210 is configured to irradiate the wire rope W with laser light having a predetermined wavelength. Note that the light emitting unit 210 may emit visible light or non-visible light (such as infrared light). Also, the light emitting unit 210 may be a laser element other than a semiconductor.

The light receiving section 220 is configured to receive the light emitted from the light emitting section 210 and reflected by the wire rope W. As shown in FIG. Further, the light receiving section 220 is configured to output a signal to the outside according to the intensity of the received light. The light receiving element 221 is configured to receive light and convert it into an electrical signal according to its intensity. The light receiving element 221 is composed of, for example, a photodiode. The electronic circuit 222 is configured to receive the electrical signal from the light receiving element 221, amplify it, and output the signal to the outside.

The converging lens 231 is configured to condense the light from the light emitting section 210 onto the wire rope W. As shown in FIG. The converging lens 231 is arranged between the light emitting section 210 and the half mirror 232 . The half mirror 232 is configured to guide part of the light reflected by the surface of the wire rope W to the light receiving section 220 . The half mirror 232 is arranged between the converging lens 231 and the wire rope W. The imaging lens 233 is configured to form an image of the light reflected by the surface of the wire rope W and guided by the half mirror 232 on the light receiving element 221 of the light receiving section 220 . The imaging lens 233 is arranged between the half mirror 232 and the light receiving section 220 .

As shown in FIGS. 6 and 7, the light irradiated to the wire rope W is reflected toward the half mirror 232 at (A) the convex portion (flat portion). Therefore, the intensity of the light received by the light receiving unit 220 increases at the position of (A) the convex portion (flat portion). Further, the light irradiated to the wire rope W is obliquely reflected at the (B) inclined portion. Therefore, the intensity of the light received by the light receiving unit 220 is reduced at the (B) position of the inclined portion. In addition, the light irradiated to the wire rope W is reflected toward the half mirror 232 while being scattered obliquely at the bottom (C). Therefore, at the position (C) of the bottom portion, the intensity of the light received by the light receiving portion 220 is small (however, it is slightly higher than at the position of (B) the inclined portion). That is, by moving the wire rope W relative to the position acquisition unit 201, as shown in FIG. 7, a signal in which the light intensity changes with time is acquired.

Here, since the pitch of the unevenness of the wire rope W is known, it is possible to acquire the position of the wire rope W by detecting the unevenness of the wire rope W using a threshold value. Specifically, first, (1) the distance L between the uneven pitches of the wire rope W (see FIG. 6) is divided by the time interval Δt when the strength threshold value is exceeded. Calculate the velocity between pitches. For example, when an elevator is accelerating from a stationary state, the speed is slow at the beginning, so the time interval Δt between pitches increases. Then, as the vehicle accelerates, the speed increases, so the time interval Δt between pitches gradually decreases.

(2) It is possible to convert to the distance from the starting point of the wire rope W by multiplying the velocity between each pitch by the time interval Δt and adding the result. In this case, the velocity between each pitch may be approximated by a polynomial (for example, within a cubic equation) to be smoothed, and then converted into a distance. Through the above processing, it is possible to acquire both the relative movement speed and the relative position of the wire rope W. In addition, when acquiring only the relative position of the wire rope W, the number of irregularities may be multiplied by the pitch of the irregularities.

Note that the position acquisition unit may be configured as shown in FIG. Specifically, as shown in FIG. 8, the position acquisition section 202 includes a light emitting section 210, a light receiving section 220, a half mirror 232, and a lens 234. As shown in FIG. The light receiving section 220 has a light receiving element 221 and an electronic circuit 222 . The lens 234 is arranged between the half mirror 232 and the wire rope W in the configuration of FIG. Further, the lens 234 integrally has both functions of converging light onto the wire rope W and forming an image of light onto the light receiving section 220 . This makes it possible to reduce the number of parts.

Also, the position acquisition unit may be configured as shown in FIG. Specifically, as shown in FIG. 9, the position acquisition unit 203 includes a light emitting unit 210, a light receiving unit 220, a converging lens 231, an imaging lens 233, a polarizing beam splitter 235, and a wavelength plate 236. contains. The light receiving section 220 has a light receiving element 221 and an electronic circuit 222 . In the configuration of FIG. 9 , the polarization beam splitter 235 and the wavelength plate 236 guide the light reflected by the surface of the wire rope W to the light receiving section 220 . A polarizing beam splitter 235 is positioned between the converging lens 231 and the wave plate 236 . A wave plate 236 is arranged between the polarizing beam splitter 235 and the wire rope W. FIG. Wave plate 236 includes a quarter wave plate.

Also, the arrangement of the light emitting unit 210 and the light receiving unit 220 of the position acquisition unit may be reversed. That is, the direction of the light emitted from the light emitting unit 210 is changed by the half mirror 232 or the polarizing beam splitter 235, and the wire rope W is irradiated with the reflected light. You can guide me.

(Effect of Embodiment)
The following effects can be obtained in this embodiment.

In this embodiment, as described above, the control unit 302 causes the display unit 304 to display the state of the wire rope W and the inspection position information in association with each other based on the inspection position information of the wire rope W and the detection signal. configured to control the As a result, the worker can easily identify the damaged position of the wire rope W by checking the display on the display unit 304 in which the state of the wire rope W and the inspection position information are displayed in association with each other. , it is possible to suppress an increase in the burden on the operator for specifying the damaged position of the wire rope W. Further, when performing inspection while moving the wire rope W relative to the differential coil 10, even if there is damage, the relative movement of the wire rope W to the differential coil 10 does not have to be stopped. It is possible to suppress the inspection time from becoming long due to the interruption of the inspection.

Further, in the present embodiment, as described above, the control unit 302 is configured to associate the information on the state of the wire rope W with the inspection position information and store them in the storage unit 303 . As a result, it is possible to compare the inspection result of the inspection with the previous inspection result stored in the storage unit 303, so that changes in the wire rope W over time can be easily obtained. As a result, it is possible to accurately determine when the wire rope W should be replaced.

Further, in the present embodiment, as described above, the control unit 302 causes the display unit 304 to display a display indicating the damage state of the wire rope W in association with the inspection position information based on the magnitude of the detection signal. configured to As a result, the operator can easily check the state and position of damage to the wire rope W based on the display on the display unit 304 .

Further, in this embodiment, as described above, the threshold value for judging the state of the wire rope W is displayed on the display unit 304 together with the waveform of the detection signal. As a result, the detection signal and the threshold value can be easily compared, so that the operator can easily check the state of the wire rope W.

Further, in the present embodiment, as described above, the control unit 302 is configured to acquire the detection signal and the inspection position information in parallel, and associate the state of the wire rope W with the inspection position information. do. This makes it possible to easily associate the state of the wire rope W with the inspection position information.

Further, in the present embodiment, as described above, the control unit 302 associates the state of the wire rope W with the inspection position information based on the inspection position information acquired by the position acquisition unit 201 and the detection signal. It is configured to be displayed on the display unit 304 . As a result, the inspection position can be easily acquired by the position acquiring unit 201, so that the state of the wire rope W and the inspection position information can be easily associated.

Further, in the present embodiment, as described above, the cumulative number of abnormal states to be notified according to the state of the wire rope W is displayed on the display unit together with the display that associates the state of the wire rope W with the inspection position information. 304 for display. Accordingly, the operator can easily recognize the number of abnormal states such as damage at the inspection position based on the display on the display unit 304 .

(Modification)
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the above description of the embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the above embodiments, the magnetic material inspected by the magnetic material inspection system is a wire rope, but the present invention is not limited to this. In the present invention, the magnetic material inspected by the magnetic material inspection system may be a magnetic material other than the wire rope.

Moreover, although the wire ropes to be inspected are used in cranes, elevators, suspension bridges, robots, and the like in the above embodiments, the present invention is not limited thereto. In the present invention, the wire rope (magnetic material) to be inspected may be used for cranes, elevators, suspension bridges, and robots.

Further, in the above-described embodiment, an example of a configuration in which the magnetic material inspection system includes the magnetic field applying unit has been described, but the present invention is not limited to this. In the present invention, the magnetic material inspection system does not have to include the magnetic field applying section.

Further, in the above embodiment, an example of a configuration in which a control unit is provided in an external computer for the magnetic material inspection apparatus provided with a differential coil (detection coil) has been shown, but the present invention is not limited to this. do not have. In the present invention, the control unit may be provided in the magnetic material inspection device provided with the detection coil. Also, the detection unit and the control unit may be provided integrally.

Further, in the above-described embodiment, an example of a configuration in which a display unit is provided in an external computer with respect to the magnetic material inspection apparatus provided with a differential coil (detection coil) has been shown, but the present invention is not limited to this. do not have. In the present invention, the display unit may be provided in the magnetic material inspection device provided with the detection coil.

Also, the display unit may be provided separately from the computer. Also, the display unit may be connected by wire or wirelessly. Also, the display unit may be a liquid crystal monitor.

Further, in the above embodiment, information on the state of the magnetic material and inspection position information are stored in association with each other in the storage unit of the computer external to the magnetic material inspection apparatus provided with the differential coil (detection coil). Although an example of the configuration is shown, the present invention is not limited to this. In the present invention, the information on the state of the magnetic material and the inspection position information may be associated and stored in another storage medium, a server on the cloud, or the like. Further, the information on the state of the magnetic material and the inspection position information may be associated and stored in a memory or a storage medium provided in the magnetic material inspection apparatus.

Also, the display indicating "caution" or "warning" on the display unit may be a symbol. In that case, for example, a symbol representing the presence of damage is displayed in association with the inspection position information. In addition, the symbol is displayed in a different color depending on the type of damage. Also, the size of the symbol is changed and displayed according to the progress of the damage.

Moreover, although the example of the structure which provides an excitation coil in a magnetic material inspection system was shown in the said embodiment, this invention is not limited to this. In the present invention, the excitation coil may not be provided in the magnetic material inspection system.

2 Electronic circuit part (detection part)
10 differential coil (detection coil)
100 magnetic material inspection system 201, 202, 203 position acquisition unit 302 control unit 303 storage unit 304 display unit W wire rope (magnetic material)

Claims (9)

a detection coil wound around a magnetic body for detecting a change in the magnetic field of the magnetic body and transmitting a detection signal;
a detection unit that detects the state of the magnetic material based on the detection signal from the detection coil;
a display unit that displays the state of the magnetic material;
a control unit that performs control to display the state of the magnetic material and the inspection position information in association with each other on the display unit based on the inspection position information of the magnetic material and the detection signal;
The control unit is configured to associate the state of the magnetic material and the inspection position information with the horizontal axis of the waveform of the detection signal as the inspection position information, and display the information on the display unit,
A magnetic material inspection system, wherein an integration signal obtained by integrating a differential signal as the detection signal and the inspection position information are associated with each other and displayed on the display unit. 2. The magnetic body inspection system according to claim 1, wherein said control section is configured to associate information on the state of said magnetic body with said inspection position information and store the information in a storage section. The control unit is configured to display, on the display unit, a display indicating the state of damage to the magnetic material in association with the inspection position information based on the magnitude of the detection signal. 3. The magnetic material inspection system according to 1 or 2. 4. The controller according to any one of claims 1 to 3, wherein the control unit is configured to display a threshold value for judging the state of the magnetic material on the display unit together with the waveform of the detection signal. The magnetic material inspection system according to item 1. Claims 1 to 4, wherein the control unit acquires the detection signal and the inspection position information in parallel, and associates the state of the magnetic material with the inspection position information. The magnetic material inspection system according to any one of . further comprising a position acquisition unit for acquiring the inspection position information;
The control unit is configured to display the state of the magnetic material and the inspection position information in association with each other on the display unit based on the inspection position information acquired by the position acquisition unit and the detection signal. The magnetic material inspection system according to any one of claims 1 to 5, wherein The control unit displays the cumulative number of abnormal states notified according to the state of the magnetic material on the display unit together with a display that associates the state of the magnetic material with the inspection position information. The magnetic material inspection system according to any one of claims 1 to 6, which is configured. The magnetic body inspection system according to any one of claims 1 to 7, wherein the magnetic body is a wire rope formed of a plurality of strands. The horizontal axis of the waveform of the detection signal based on the detection signal for detecting the change in the magnetic field of the magnetic material detected by the detection coil wound so as to surround the magnetic material and the inspection position information of the magnetic material. as the inspection position information, the state of the magnetic material and the inspection position information are displayed in association with each other on a display unit, and an integrated signal obtained by integrating the differential signal as the detection signal is associated with the inspection position information. A program that causes a computer to execute control to display on the display unit.

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