JP2019168253A - Magnetic body inspection system, magnetic body inspection device and magnetic body inspection method - Google Patents

Abstract

Provided is a magnetic body inspection system that can intuitively understand the state of damage of a magnetic body even when measuring a portion where a plurality of damaged areas of a magnetic body are continuously distributed by a differential coil. I do. A magnetic material inspection system detects a magnetic flux of a wire rope by a differential coil while moving the differential coil relative to the wire rope, and acquires a measurement waveform. The apparatus includes a wire rope inspection apparatus 100 and a processing apparatus 200 that performs a process of integrating a measured waveform Wm and converts the integrated waveform into an integrated waveform Wi. [Selection diagram] FIG.

Description

  The present invention relates to a magnetic material inspection system, a magnetic material inspection device, and a magnetic material inspection method, and more particularly to a magnetic material inspection system, a magnetic material inspection device, and a magnetic material inspection method that detect magnetic flux of a magnetic material using a differential coil.

  2. Description of the Related Art Conventionally, a magnetic body inspection apparatus that detects a magnetic flux of a magnetic body using a differential coil is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a wire rope damage detector (magnetic material inspection device) that detects damage to a wire rope (magnetic material) such as wire breakage or local wear. This wire rope damage detector detects a pair of detections while moving the wire rope, which is an object to be inspected, with respect to a pair of differentially connected detection coils (differential coils) with the wire rope magnetized. The magnetic flux of the wire rope is detected (measured) by the coil. Since the measurement waveform different from the normal waveform is obtained at the damaged portion of the wire rope, the user can determine the damaged portion of the wire rope based on the obtained measured waveform. Although not described in the above-mentioned Patent Document 1, when measuring magnetic flux with a differential coil such as this pair of detection coils, if there is only one damaged part, the polarities of each other like a sine wave for one period A double-sided waveform having two waveform parts opposite to each other is obtained as a measurement waveform.

Utility Model Registration No. 2556957

  Here, although not described in the above-mentioned Patent Document 1, there may be a portion in which a damaged portion (wire breakage portion or the like) is continuously distributed in the wire rope that is an inspection object. In particular, the tendency of continuous distribution is often seen in the case of broken wires. When the magnetic flux in this portion is measured by the differential coil, a plurality of damaged portions are continuously distributed, so that a measurement waveform obtained by adding both side waveforms corresponding to each damaged portion is acquired. In addition, in the added measurement waveform, waveform portions having opposite polarities of both side waveforms corresponding to adjacent damaged portions may be added and canceled. In this case, since a measurement waveform that does not sufficiently represent the state of damage to the wire rope is obtained, it is difficult to intuitively understand the state of damage to the wire rope (magnetic material) simply by checking the measurement waveform. There is a problem.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to measure a portion in which a plurality of damaged portions of a magnetic material are continuously distributed by a differential coil. Another object is to provide a magnetic body inspection system, a magnetic body inspection apparatus, and a magnetic body inspection method capable of intuitively understanding the state of damage to a magnetic body.

  In order to achieve the above object, a magnetic body inspection system according to a first aspect of the present invention detects a magnetic flux of a magnetic body with a differential coil while moving the differential coil relative to the magnetic body, A magnetic substance inspection device that acquires a measurement waveform and a processing device that performs processing for integrating the measurement waveform and converts the measurement waveform into an integration waveform.

  In the magnetic substance inspection system according to the first aspect of the present invention, by configuring as described above, a portion where a damaged part (such as a broken wire part) of a magnetic substance is continuously distributed by a differential coil is measured. If the measurement waveform is canceled by adding the waveform parts with opposite polarities of the two side waveforms corresponding to the adjacent damaged part, the distribution range of the damaged part is obtained. Can be converted into an integrated waveform having one peak shape. As a result, even when measuring the part where multiple damage points of the magnetic material are continuously distributed by the differential coil, the state of damage (scale) of the magnetic material can be understood intuitively by checking the integrated waveform. It is possible to provide a magnetic substance inspection system capable of doing this. In addition, since the original measurement waveform can be converted into a simpler integrated waveform, the magnetic material can also be used in cases other than the case where the portion where the damaged portion of the magnetic material is continuously distributed by the differential coil is measured. It is easy to intuitively understand the state of the bruise. Furthermore, in the magnetic substance inspection system according to the first aspect of the present invention, an integrated waveform can be obtained in a state where fine noise (noise) of the measurement waveform is reduced by performing processing for integrating the measurement waveform. As a result, a waveform (integrated waveform) that is easier to see and intuitively understand than the original measurement waveform can be presented to the user by the amount of noise reduction.

  In the magnetic substance inspection system according to the first aspect, preferably, the processing device includes a display unit that displays an integrated waveform. With this configuration, since the integrated waveform displayed on the display unit of the processing apparatus can be confirmed, the user can check the state of damage to the magnetic material based on the integrated waveform displayed on the display unit of the processing apparatus. Can be easily understood.

  In the magnetic substance inspection system according to the first aspect, preferably, the processing device is configured to perform at least one of a process of analyzing the waveform and a process of determining abnormality of the magnetic substance based on the integrated waveform. ing. According to this configuration, waveform analysis or magnetic substance abnormality determination can be performed based on the integrated waveform with reduced noise (noise). Therefore, waveform analysis or magnetic substance based on the original measurement waveform can be performed. Compared to the case where the abnormality determination is performed, the waveform analysis or the magnetic substance abnormality determination can be performed with high accuracy.

  In the magnetic substance inspection system according to the first aspect, preferably, when the integrated waveform reaches the threshold value, the processing device shifts the position of the integrated waveform from the position at which the threshold value is reached with respect to the integrated waveform. An offset process is performed. With this configuration, even when the integrated waveform becomes a waveform that rises to the right due to noise in the measurement waveform, the position of the integrated waveform can be shifted from the position where the threshold value is reached. As a result, it is possible to present to the user a waveform (integrated waveform) that is easier to see and intuitively understand than when the integrated waveform continues to rise.

  In the magnetic substance inspection system according to the first aspect, preferably, the processing device is configured to perform processing with a high-pass filter on the integrated waveform. If comprised in this way, it can suppress that an integrated waveform turns into a waveform with a big offset, such as rising to the right. As a result, a waveform (integrated waveform) that is easier to see and intuitively understand can be presented to the user.

  A magnetic substance inspection apparatus according to a second aspect of the present invention detects a magnetic flux of a magnetic substance while moving relative to the magnetic substance, and integrates the measurement waveform with a differential coil that acquires the measurement waveform. And a processing unit for performing processing to convert to an integrated waveform.

  In the magnetic body inspection apparatus according to the second aspect of the present invention, by configuring as described above, a plurality of damaged portions of the magnetic body are continuously provided by the differential coil as in the magnetic body inspection system according to the first aspect. Even in the case of measuring a distributed portion, it is possible to provide a magnetic substance inspection apparatus capable of intuitively understanding the state of damage to the magnetic substance by checking the integrated waveform.

  A magnetic body inspection method according to a third aspect of the present invention includes a step of detecting a magnetic flux of a magnetic body by a differential coil while relatively moving the differential coil with respect to the magnetic body, and obtaining a measurement waveform; Performing a process of integrating the measurement waveform and converting the measurement waveform into an integrated waveform.

  In the magnetic body inspection method according to the third aspect of the present invention, by configuring as described above, a plurality of damaged portions of the magnetic body are continuously provided by the differential coil as in the magnetic body inspection system according to the first aspect. Even in the case of measuring a distributed portion, it is possible to provide a magnetic body inspection method capable of intuitively understanding the state of damage to the magnetic body by checking the integrated waveform.

  According to the present invention, as described above, it is possible to intuitively understand the state of damage to a magnetic material even when measuring a portion where a plurality of magnetic material damage locations are continuously distributed using a differential coil. it can.

It is the schematic which shows the structure of the magnetic body test | inspection system by 1st and 2nd embodiment. It is a figure which shows the structure of the magnetic body test | inspection apparatus by 1st and 2nd embodiment. It is a block diagram which shows the control structure of the magnetic body test | inspection apparatus by 1st and 2nd embodiment. It is a figure which shows the measurement waveform at the time of measuring the magnetic body (wire rope) in which the disconnection of one place produced with the differential coil. It is a figure which shows the measurement waveform and integral waveform at the time of measuring the magnetic body (wire rope) which one place disconnection produced with the differential coil. It is a figure which shows the measurement waveform at the time of measuring the magnetic body (wire rope) in which the disconnection of two places produced with the differential coil. It is a figure which shows the measurement waveform and integration waveform at the time of measuring the magnetic body (wire rope) in which the disconnection of two places produced with the differential coil. It is a figure which shows the measurement waveform at the time of measuring the magnetic body (wire rope) in which the disconnection of 12 places produced with the differential coil. It is a figure which shows the measurement waveform and integration waveform at the time of measuring the magnetic body (wire rope) in which the disconnection of 12 places produced with the differential coil. It is a figure for demonstrating the offset process of the integral waveform by the processing apparatus by 1st Embodiment.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

[First Embodiment]
With reference to FIGS. 1-10, the structure of the magnetic body test | inspection system 300 by 1st Embodiment is demonstrated.

(Configuration of magnetic material inspection system)
As shown in FIG. 1, the magnetic body inspection system 300 is a system for inspecting a damage (such as a broken wire) of a wire rope W that is an inspection object and is a magnetic body. The magnetic body inspection system 300 includes a magnetic body inspection apparatus 100 that measures the magnetic flux of the wire rope W, a display of a measurement result of the magnetic flux of the wire rope W by the magnetic body inspection apparatus 100, and a wire rope W by the magnetic body inspection apparatus 100. And a processing device 200 that performs analysis based on the measurement result of the magnetic flux of the magnetic field. By inspecting the wire rope W for damage by the magnetic substance inspection system 300, it is possible to confirm the damage of the wire rope W that is difficult to visually confirm. The wire rope W is an example of the “magnetic body” in the claims.

  The wire rope W is used for, for example, a crane, an elevator, a suspension bridge, a robot, and the like. The wire rope W is formed by knitting a wire material having magnetism (for example, strand knitting), and is a magnetic body made of a long material extending in the X direction. The state of the wire rope W (whether there is a scratch or the like) is monitored by the magnetic body inspection device 100 in order to prevent the wire rope W from being cut due to deterioration. As a result of the measurement of the magnetic flux, the wire rope W determined that the degree of deterioration exceeds the determined standard is replaced by the operator.

  The wire rope W is disposed so as to extend in the X direction at the position of the magnetic substance inspection apparatus 100. The magnetic substance inspection apparatus 100 measures the magnetic flux of the wire rope W while moving in the X direction (longitudinal direction of the wire rope W) relative to the wire rope W along the surface of the wire rope W. For example, when the wire rope W itself moves like a wire rope W used in a crane or an elevator, the wire rope W is moved in the X direction with the magnetic substance inspection device 100 fixed to the wire rope W. The magnetic flux of the wire rope W is measured by the magnetic substance inspection apparatus 100 while being moved to. Further, when the wire rope W itself does not move like the wire rope W used for the suspension bridge, the magnetic body inspection apparatus 100 is fixed in the X direction with the wire rope W fixed to the magnetic body inspection apparatus 100. The magnetic flux of the wire rope W is measured by the magnetic substance inspection apparatus 100 while being moved to. Thereby, the magnetic flux in each position of the wire rope W is measured.

  As shown in FIGS. 2 and 3, the magnetic substance inspection apparatus 100 includes a detection unit 1, a magnetic field application unit 2 (see FIG. 2), and an electronic circuit unit 3. In the magnetic substance inspection apparatus 100, no DC magnetizer is disposed in the vicinity of the detection unit 1.

  The detection unit 1 detects (measures) the magnetic flux of the wire rope W. Specifically, the detection unit 1 includes an excitation coil 11 and a differential coil 12 having a pair of reception coils 12a and 12b. The excitation coil 11 excites the magnetization state of the wire rope W. The excitation coil 11 is formed by winding a conductive wire a plurality of times, and is arranged around the axis of the wire rope W so as to surround the wire rope W. The excitation coil 11 generates a magnetic field along the X direction (longitudinal direction and axial direction of the wire rope W) inside (inside the ring) when an excitation alternating current flows, and the generated magnetic field is disposed inside. Applied to the wire rope W.

  The differential coil 12 (receiver coils 12a and 12b) detects (measures) the magnetic flux in the X direction of the wire rope W to which the magnetic field is applied by the excitation coil 11. The receiving coils 12a and 12b of the differential coil 12 are each formed by winding a conducting wire a plurality of times and are differentially connected to each other. The receiving coils 12a and 12b of the differential coil 12 are arranged around the axis of the wire rope W so as to surround the wire rope W. The receiving coils 12a and 12b of the differential coil 12 move in the X direction relative to the wire rope W, while the X direction magnetic flux inside the wire rope W arranged inside (inside the ring) (all Magnetic flux) is detected. The differential coil 12 transmits a differential signal (detection signal) as a voltage in accordance with the detected magnetic flux in the X direction of the wire rope W. The differential signal is a signal indicating a difference between the signal from the receiving coil 12a and the signal from the receiving coil 12b.

  For example, the differential coil 12 transmits a differential signal having a value of substantially zero when both the receiving coils 12a and 12b are located at a normal location (a location where there is no damage) of the wire rope W. This is because in the normal location of the wire rope W, the total magnetic flux (the value obtained by multiplying the magnetic field magnitude by the magnetic permeability and the area) is substantially the same. Further, for example, when one of the receiving coils 12a and 12b is located at a damaged portion of the wire rope W and the other is located at a normal portion of the wire rope W, the differential coil 12 has a relatively large value (varies). A differential signal (see FIG. 4) having a value) is transmitted. This is because the total magnetic flux at the damaged portion of the wire rope W is different from the normal portion of the wire rope W. In this manner, the differential coil 12 can obtain a signal indicating the damaged portion of the wire rope W. In the differential coil 12, noise can be canceled out by taking the difference between the signals of the receiving coils 12a and 12b, so that a signal with a good S / N ratio can be obtained. The magnetic substance inspection apparatus 100 detects (measures) the magnetic flux of the wire rope W by the differential coil 12 while moving the differential coil 12 relative to the wire rope W in the X direction, and the measurement waveform Wm ( (See FIGS. 4, 6 and 8).

  The differential coil 12 is provided inside the excitation coil 11 (inside the ring). The differential coil 12 may be provided outside the excitation coil 11 (outside of the ring). The receiving coils 12a and 12b of the differential coil 12 are arranged along the X direction in this order from the X1 direction side to the X2 direction side. Note that the distance L1 between the pair of receiving coils 12a and 12b in the X direction (the relative movement direction of the wire rope W and the differential coil 12) is preferably as small as possible. Further, the lengths L2 and L3 of the pair of receiving coils 12a and 12b in the X direction are preferably as small as possible.

  The magnetic field application unit 2 is configured to adjust the magnitude and direction of the magnetization of the wire rope W in advance before the detection unit 1 detects the magnetic flux of the wire rope W. Thereby, when detecting the magnetic flux of the wire rope W by the detection unit 1, it is possible to suppress the occurrence of noise (noise) due to the disturbance of magnetization. The magnetic field application unit 2 includes a first magnetic field application unit 2 a having magnets 21 and 22 and a second magnetic field application unit 2 b having magnets 23 and 24. The first magnetic field application unit 2a (magnets 21 and 22) is arranged on the X1 direction side (one side in the longitudinal direction of the wire rope W) with respect to the detection unit 1. The second magnetic field application unit 2b (magnets 23 and 24) is disposed on the X2 direction side (the other side in the longitudinal direction of the wire rope W) with respect to the detection unit 1.

  As shown in FIG. 3, the electronic circuit unit 3 includes a processing unit 31, a reception I / F (interface) 32, an excitation I / F 33, a power supply circuit 34, a storage unit 35, and a communication unit 36. . The processing unit 31 is configured to control each unit of the magnetic substance inspection apparatus 100. The processing unit 31 includes a processor such as a CPU (Central Processing Unit), a memory, an AD converter, and the like.

  The reception I / F 32 receives the differential signal from the differential coil 12 and transmits it to the processing unit 31. The reception I / F 32 includes an amplifier. The reception I / F 32 amplifies the differential signal from the differential coil 12 using an amplifier and transmits the amplified signal to the processing unit 31. The excitation I / F 33 receives the control signal from the processing unit 31 and controls the supply of power to the excitation coil 11 based on the received control signal. The power supply circuit 34 receives electric power from the outside, and supplies electric power to each part of the magnetic substance inspection apparatus 100 such as the excitation coil 13. The storage unit 35 is a storage medium including, for example, a flash memory, and stores (saves) information such as measurement results (measurement data) of the wire rope W. The communication unit 36 is a communication interface, and connects the magnetic substance inspection device 100 and the processing device 200 so that they can communicate with each other.

  As illustrated in FIG. 1, the processing device 200 includes a communication unit 201, a processing unit 202, a storage unit 203, and a display unit 204. The communication unit 201 is an interface for communication, and connects the magnetic substance inspection apparatus 100 and the processing apparatus 200 so that they can communicate with each other. The processing device 200 receives the measurement result (measurement data) of the wire rope W by the magnetic substance inspection device 100 via the communication unit 201. The processing unit 202 controls each unit of the processing device 200. The processing unit 202 includes a processor such as a CPU, a memory, and the like. Based on the measurement result of the wire rope W received via the communication unit 201, the processing unit 202 analyzes the damage of the wire rope W such as a broken wire. The storage unit 203 is a storage medium including a flash memory, for example, and stores (saves) information such as the measurement result of the wire rope W and the analysis result of the measurement result of the wire rope W by the processing unit 202. The display unit 204 is a liquid crystal monitor, for example, and displays information such as the measurement result of the wire rope W and the analysis result of the measurement result of the wire rope W by the processing unit 202.

  Here, in the first embodiment, as illustrated in FIGS. 4 to 9, the processing unit 202 of the processing device 200 has a measurement waveform Wm (consisting of a differential signal acquired by the differential coil 12 of the magnetic substance inspection device 100). The measurement data is integrated to convert the measurement waveform Wm into an integration waveform Wi (integration data). 4 to 9 are graphs showing the measured waveform Wm or the integrated waveform Wi. The vertical axis is an axis indicating signal intensity (voltage or the like). The horizontal axis is a time axis indicating the relative movement amount between the wire rope W and the differential coil 12 at the time of measurement. The processing unit 202 of the processing device 200 converts the measurement waveform Wm into an integrated waveform Wi by integrating the signal value of the measurement waveform Wm in the time axis direction.

  For example, as shown in FIG. 4, when a wire rope W having a single wire breakage point is measured by the differential coil 12, one double-sided waveform having two waveform portions with opposite polarities (convex upward) ) And a measured waveform Wm as a waveform including one waveform portion convex downward. In this case, as shown in FIG. 5, the measurement waveform Wm as one side waveform is converted into a mountain-shaped integrated waveform Wi having one sharp peak by the processing unit 202 of the processing device 200. In FIGS. 4 to 9, for easy understanding, the broken wire portions of the wire rope W are schematically shown by black circles so as to correspond to the respective waveforms.

  Further, for example, as shown in FIG. 6, when a wire rope W having two wire breaks is measured by the differential coil 12, a measurement waveform Wm in which two both-side waveforms are added is obtained. In this case, as shown in FIG. 7, the measurement waveform Wm as a waveform obtained by adding two two-side waveforms is converted into a mountain-shaped integrated waveform Wi having two sharp peaks by the processing unit 202 of the processing device 200. Converted.

  Further, for example, as shown in FIG. 8, when a wire rope W in which 12 wire breakage points are continuously and closely distributed by the differential coil 12 is measured, 12 side-by-side waveforms are added. A waveform Wm is obtained. In this measurement waveform Wm, since the waveform parts having opposite polarities of the both-side waveforms corresponding to adjacent wire break locations are added and cancelled, the wire rope particularly at an intermediate position between a plurality of wire break locations. It is difficult to intuitively understand whether or not the W wire breakage has occurred. In this case, as shown in FIG. 9, the measurement waveform Wm as a waveform obtained by adding 12 side-side waveforms is integrated by the processing unit 202 of the processing device 200 in a mountain-shaped integrated waveform Wi having one gentle peak. Is converted to In this integrated waveform Wi, since the mountain-shaped portion substantially corresponds to the distribution range of the broken wire portions, it is easy to intuitively understand the state (scale) of the broken wires of the wire rope W. In the first embodiment, the magnetic field application unit 2 is provided in order to improve the S / N ratio. However, depending on the noise environment and the properties of the magnetic material to be measured, integration is possible without providing the magnetic field application unit 2. The magnetic state of the magnetic material can be expressed by the waveform.

  For example, the processing unit 202 of the processing device 200 performs processing for integrating the measurement waveform Wm in real time. Thereby, the measurement waveform Wm can be converted into the integrated waveform Wi in real time, and the integrated waveform Wi can be confirmed in real time. Further, the processing unit 202 of the processing device 200 reads out the measured waveform Wm stored in the storage unit 203 based on an integration instruction from the user using an input operation unit such as a keyboard or a mouse, for example. A process of integrating with respect to Wm is performed. As a result, the measured waveform Wm can be converted into the integrated waveform Wi afterwards to check the integrated waveform Wi. When the measured waveform Wm is converted into the integrated waveform Wi afterwards, a range to be integrated may be specified from the measured waveform Wm, and the measured waveform Wm in the specified range may be converted into the integrated waveform Wi.

  In addition, the processing unit 202 of the processing device 200 performs processing for displaying the integrated waveform Wi converted from the measurement waveform Wm on the display unit 204. When displaying the integrated waveform Wi on the display unit 204, only the integrated waveform Wi may be displayed, or both the integrated waveform Wi and the measured waveform Wm may be displayed. Further, as will be described later, when the waveform is analyzed based on the integrated waveform Wi, the analysis result (such as a broken wire portion) may be displayed on the display unit 204 together with the integrated waveform Wi.

  In the first embodiment, the processing unit 202 of the processing device 200 performs processing for analyzing the waveform based on the integrated waveform Wi. For example, the processing unit 202 of the processing apparatus 200 performs a process of analyzing a broken wire portion (wire breakage distribution) in the waveform based on the integrated waveform Wi. Specifically, the processing unit 202 of the processing device 200 performs a process of analyzing a broken wire portion in the waveform by comparing a predetermined model waveform with an integrated waveform Wi as a measurement result. Further, the processing unit 202 of the processing device 200 performs processing for determining an abnormality (scratch) of the wire rope W based on the integrated waveform Wi. For example, when the integrated waveform has a peak that exceeds a threshold value for abnormality determination, the processing unit 202 of the processing apparatus 200 determines that the wire rope W is abnormal (damaged) and determines that the wire rope W is abnormal. Process to notify the user.

  Although not shown in FIGS. 3 to 9, the measurement waveform Wm actually has noise (noise) caused by an external magnetic material or the like. For this reason, as shown in FIG. 10, when the measurement waveform Wm is integrated, the integration waveform Wi may become a waveform that rises to the right due to noise in the measurement waveform Wm. Therefore, in the first embodiment, the processing unit 202 of the processing device 200 performs an offset process for offsetting the integrated waveform Wi at a position where the integrated waveform Wi reaches the threshold when the integrated waveform Wi reaches the offset determination threshold. Do. In the offset processing, the processing unit 202 of the processing device 200 causes the integrated waveform Wi to be lowered by a predetermined amount on the graph indicating the integrated waveform Wi so that the position of the integrated waveform Wi after the position where the threshold is reached is lowered. A process of offsetting Wi is performed.

(Effect of 1st Embodiment)
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the processing device 200 is configured to perform a process of integrating the measurement waveform Wm and convert the measurement waveform Wm into the integrated waveform Wi. As a result, when the differential coil 12 measures a portion where the damaged portions (wire disconnection portions, etc.) of the wire rope W are continuously distributed, the polarities of both side waveforms corresponding to the adjacent damaged portions are opposite to each other. Even if the waveform portions Wm are added to each other and a measurement waveform Wm canceled is obtained, the obtained measurement waveform Wm can be converted into an integrated waveform Wi having one peak shape in the distribution range of the damaged portion. it can. As a result, even when a portion where the damaged portion of the wire rope W is continuously distributed by the differential coil 12 is measured, the state (scale) of the damaged wire rope W can be determined by checking the integrated waveform Wi. A magnetic substance inspection system 300 that can be intuitively understood can be provided. In addition, since the original measurement waveform Wm can be converted into a simpler integrated waveform Wi, the differential coil 12 can be used in cases other than the case where a portion where the damaged portions of the wire rope W are continuously distributed is measured. However, it is possible to intuitively understand the damaged state of the wire rope W. Further, by performing the process of integrating the measurement waveform Wm, the integration waveform Wi can be obtained in a state where the fine noise (noise) of the measurement waveform Wm is reduced. As a result, the waveform (integrated waveform Wi) that is easier to see and intuitively understand than the original measurement waveform Wm can be presented to the user by the amount of noise reduction.

  In the first embodiment, as described above, the processing device 200 is configured to include the display unit 204 that displays the integrated waveform Wi. Thereby, since the integrated waveform Wi displayed on the display unit 204 of the processing apparatus 200 can be confirmed, the user can determine the wire rope W based on the integrated waveform Wi displayed on the display unit 204 of the processing apparatus 200. Can easily understand the state of damage.

  In the first embodiment, as described above, the differential coil 12 is configured to have a pair of receiving coils 12a and 12b. The distance L1 between the pair of reception coils 12a and 12b in the relative movement direction between the wire rope W and the differential coil 12 and the pair of reception coils 12a in the relative movement direction between the wire rope W and the differential coil 12 are used. The lengths L2 and L3 of 12b are made as small as possible. Thereby, the measurement waveform Wm can be obtained as a waveform from which the differential magnetic value of the wire rope W can be obtained more accurately. As a result, the waveform (integrated waveform Wi) obtained by integrating this accurately reflects the magnetism of the wire rope W.

  In the first embodiment, as described above, the processing device 200 is configured to perform a process of analyzing a waveform and a process of determining an abnormality in the wire rope W based on the integrated waveform Wi. As a result, waveform analysis and wire rope W abnormality determination can be performed based on the integrated waveform Wi with reduced noise (noise), and therefore, waveform analysis and wire rope W based on the original measurement waveform Wm. Compared to the case where the abnormality determination is performed, the waveform analysis or the wire rope W abnormality determination can be performed with high accuracy.

  Further, in the first embodiment, as described above, when the integrated waveform Wi reaches the threshold value, the processing device 200 determines the position of the integrated waveform Wi from the position at which the threshold value is reached with respect to the integrated waveform Wi. Is configured to perform offset processing. As a result, even when the integrated waveform Wi rises to the right due to noise in the measurement waveform Wm, the position of the integrated waveform Wi can be shifted from the position where the threshold value is reached. As a result, it is possible to present to the user a waveform (integrated waveform Wi) that is easier to see and intuitively understand than when the integrated waveform Wi continues to rise.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. 1 and 3 to 9. In the second embodiment, unlike the first embodiment in which the processing device converts the measurement waveform into an integral waveform, an example in which the magnetic substance inspection device converts the measurement waveform into an integral waveform will be described. In addition, about the structure same as the said 1st Embodiment, the same code | symbol is attached | subjected and shown in the figure, and the description is abbreviate | omitted.

(Configuration of magnetic material inspection system)
As shown in FIG. 1, the magnetic body inspection system 600 is different from the magnetic body inspection system 300 of the first embodiment in that a magnetic body inspection apparatus 400 and a processing apparatus 500 are provided. Further, as shown in FIGS. 1 and 3, the magnetic substance inspection apparatus 400 and the processing apparatus 500 include a processing unit 331 and a processing part 502, respectively, and thus the magnetic substance inspection apparatus 100 and the processing of the first embodiment. Different from the apparatus 200.

  In the second embodiment, the processing unit 331 of the magnetic substance inspection apparatus 400 is configured to perform a process of integrating the measurement waveform Wm and convert the measurement waveform Wm to the integration waveform Wi (FIGS. 4 to 5). 9). Further, the processing unit 331 of the magnetic substance inspection apparatus 400 performs a process of transmitting the integrated waveform Wi to the processing apparatus 500 via the communication unit 36. The processing unit 502 of the processing device 500 performs processing for displaying the integrated waveform Wi received from the magnetic substance inspection device 400 on the display unit 204.

  Also in the second embodiment, the integration process is the same as in the first embodiment. That is, the processing unit 331 of the magnetic substance inspection apparatus 400 integrates the measurement waveform Wm by sequentially integrating the signal value of the measurement waveform Wm in the direction in which the relative movement amount between the wire rope W and the differential coil 12 increases. Convert to waveform Wi. Further, the processing unit 331 of the magnetic substance inspection apparatus 400 may perform the process of integrating the measurement waveform Wm in real time, or is stored in the storage unit 35 based on an instruction from the user via the processing apparatus 500. Alternatively, the measured waveform Wm may be read and integrated with respect to the read measured waveform Wm. Further, when the integration process is performed, the offset process of the first embodiment may be performed.

  Other configurations of the second embodiment are the same as those of the first embodiment.

(Effect of 2nd Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, the magnetic body inspection apparatus 400 is configured to include the processing unit 331 that performs the process of integrating the measurement waveform Wm and converts the measurement waveform Wm into the integrated waveform Wi. Thus, similarly to the first embodiment, even when a portion where the damaged portion of the wire rope W is continuously distributed by the differential coil 12 is measured, by checking the integrated waveform Wi, the wire rope W Thus, it is possible to provide the magnetic substance inspection apparatus 400 that can intuitively understand the state of the damage of each other.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims, and further includes meanings equivalent to the scope of claims and all modifications (variants) within the scope.

  For example, in the first and second embodiments, the example in which the magnetic body to be inspected in the magnetic body inspection system is a wire rope is shown, but the present invention is not limited to this. In the present invention, the magnetic body to be inspected in the magnetic body inspection system may be a magnetic body other than the wire rope.

  Moreover, in the said 1st and 2nd embodiment, although the wire rope which is a test object showed the example used for a crane, an elevator, a suspension bridge, a robot, etc., this invention is not limited to this. In this invention, the wire rope (magnetic body) which is a test object may be used other than a crane, an elevator, a suspension bridge, and a robot.

  Moreover, in the said 1st and 2nd embodiment, although the processing apparatus showed the example provided with a display part, this invention is not limited to this. In the present invention, the processing apparatus does not necessarily include the display unit. When the processing device does not include a display unit, information such as an integrated waveform may be displayed on an external display device.

  Further, in the first and second embodiments, the example in which the distance L1 between the pair of receiving coils and the lengths L2 and L3 of the pair of receiving coils are made as small as possible has been shown. Not limited.

  In the first and second embodiments described above, the processing apparatus is configured to perform both the processing for analyzing the waveform and the processing for determining abnormality of the wire rope (magnetic material) based on the integrated waveform. Although shown, the present invention is not limited to this. In the present invention, the processing device may be configured to perform only one of the process of analyzing the waveform and the process of determining the abnormality of the magnetic material based on the integrated waveform. Further, the processing device may be configured not to perform both the processing for analyzing the waveform and the processing for determining abnormality of the wire rope (magnetic material) based on the integrated waveform.

  In the first and second embodiments, the example in which the offset process is performed on the integrated waveform has been described. However, the present invention is not limited to this. In the present invention, it is not always necessary to perform offset processing on the integrated waveform. In the present invention, the processing unit of the processing device may perform processing by a high-pass filter on the integrated waveform so as to suppress the integrated waveform from rising to the right. In the processing using the high-pass filter, the processing unit of the processing device performs processing for cutting the waveform component in the low frequency band on the integrated waveform. Thereby, it can suppress that an integrated waveform turns into a waveform with big offsets, such as rising to the right. As a result, a waveform (integrated waveform) that is easier to see and intuitively understand can be presented to the user.

12 Differential coil 12a, 12b Reception coil 100, 400 Magnetic body inspection apparatus 200, 500 Processing apparatus 300, 600 Magnetic body inspection system 331 Processing unit W Wire rope (magnetic body)

Claims (7)

A magnetic body inspection device for detecting a magnetic flux of the magnetic body by the differential coil while moving the differential coil relative to the magnetic body and acquiring a measurement waveform;
A magnetic substance inspection system comprising: a processing device that performs a process of integrating the measurement waveform and converts the measurement waveform into an integrated waveform.   The magnetic body inspection system according to claim 1, wherein the processing device includes a display unit that displays the integrated waveform.   3. The magnetism according to claim 1, wherein the processing device is configured to perform at least one of a process of analyzing a waveform and a process of determining an abnormality of the magnetic body based on the integrated waveform. Body examination system.   When the integrated waveform reaches a threshold value, the processing device is configured to perform an offset process for shifting the position of the integrated waveform from a position at which the threshold value is reached with respect to the integrated waveform. The magnetic substance inspection system according to claim 1.   5. The magnetic substance inspection system according to claim 1, wherein the processing device is configured to perform processing by a high-pass filter on the integrated waveform. A differential coil that detects the magnetic flux of the magnetic body while being moved relative to the magnetic body and obtains a measurement waveform;
A magnetic substance inspection apparatus comprising: a processing unit that performs a process of integrating the measurement waveform and converts the measurement waveform into an integrated waveform. Detecting the magnetic flux of the magnetic body by the differential coil while moving the differential coil relative to the magnetic body to obtain a measurement waveform;
Performing a process of integrating the measured waveform and converting the measured waveform into an integrated waveform.

Images