JP7081446B2 - Magnetic material inspection device and magnetic material inspection system - Google Patents

Description

The present invention relates to a magnetic material inspection device and a magnetic material inspection system, and more particularly to a magnetic material inspection device and a magnetic material inspection system capable of inspecting a plurality of magnetic materials.

Conventionally, wire ropes (magnetic materials) used for cranes, elevators, suspension bridges, robots, and the like are known. In such a wire rope, a visual inspection is performed in order to know the degree of deterioration due to wire breakage, wear, deformation, and the like. Further, for example, a non-destructive inspection by magnetism may be performed because the degree of deterioration inside the wire rope cannot be determined only by visual inspection.

As a device for performing such non-destructive inspection, a magnetic substance inspection device capable of inspecting a plurality of magnetic substances has been conventionally known (see, for example, Patent Document 1). The above-mentioned Patent Document 1 discloses a rope tester (magnetic material inspection apparatus) capable of inspecting a plurality of wire ropes (magnetic materials). This rope tester includes a plurality of magnetization detectors provided in the same number as the wire rope. Each of the plurality of magnetization detectors detects the magnetic flux of each of the plurality of wire ropes. The rope tester determines which of the plurality of wire ropes is damaged based on the detection result of the magnetic flux of the wire rope by the magnetization detector. In addition, each of the plurality of magnetization detectors includes a pancake coil for detecting the magnetic flux of the wire rope. The pancake coil around which the conducting wire is wound is provided so as to surround the wire rope so as to be curved in a U shape by bending.

Japanese Unexamined Patent Publication No. 2005-89172

However, in the rope tester described in Patent Document 1, since the pancake coil around which the lead wire is wound is provided so as to be curved in a U shape, the shape and structure of the coil (pancake coil) are complicated. To become. Further, since it is necessary to perform a bending process in order to form the pancake coil around which the conductor is wound into a U shape, the manufacturability (manufacturability) of the coil (pancake coil) is lowered. Further, since the pancake coil is provided in a U shape so as to surround the wire rope, the wire rope and the coil (pancake coil) are likely to come into contact with each other, and the quality of the coil is likely to deteriorate. As a result, among multiple wire ropes, the shape and structure of the coil around which the wire is wound is simplified, the manufacturability of the coil around which the wire is wound is improved, and the deterioration of the quality of the coil is suppressed. There is a problem that it is not possible to determine which wire rope is damaged.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to simplify the shape and structure of the coil, improve the manufacturability of the coil, and reduce the quality of the coil. It is an object of the present invention to provide a magnetic material inspection device and a magnetic material inspection system capable of determining which of a plurality of magnetic materials is damaged while suppressing the above.

In order to achieve the above object, the magnetic material inspection apparatus according to the first aspect of the present invention is provided with a number equal to or larger than the number of a plurality of magnetic materials, and a plurality of differential coils for detecting the magnetic flux of each of the plurality of magnetic materials. And a processing unit that acquires the detection signal of each of the plurality of differential coils, and each of the plurality of differential coils is differentially connected to the first receiving coil and the first receiving coil. At the same time, it has a second receiving coil provided so that the detection surface of the first receiving coil and the detection surface face each other, and when detecting the magnetic flux of each of the plurality of magnetic materials, the first receiving coil is provided. A magnetic material is arranged between the and the second receiving coil, and the processing unit uses the detection signal having the largest damage waveform among the detection signals of the plurality of differential coils. The corresponding magnetic material is configured to identify the damaged magnetic material .

In the magnetic material inspection apparatus according to the first aspect of the present invention, unlike the case where the coil is provided so as to be curved in a U shape by being configured as described above, it is not necessary to bend the coil. The manufacturability of the coil (differential coil) can be improved. Furthermore, even when the coil is exposed, the magnetic material and the coil (differential coil) are less likely to come into contact with each other than when the coil is provided in a U shape so as to surround the magnetic material. Therefore, it is possible to prevent the quality of the coil (differential coil) from deteriorating. Further, by providing a plurality of differential coils, it is possible to individually detect damage to a plurality of magnetic materials, so that it is possible to determine which of the plurality of magnetic materials is damaged. can. As a result , it is possible to determine which of the plurality of magnetic materials is damaged while improving the manufacturability of the coil and suppressing the deterioration of the quality of the coil. The device can be provided.

In the magnetic material inspection apparatus according to the first aspect, preferably, each of the plurality of differential coils has a portion on one side in the direction in which the magnetic material of the first receiving coil and the second receiving coil extends, and a first. It is provided so as to form a differential coil that outputs a differential signal from the receiving coil of the above and the portion of the second receiving coil on the other side in the extending direction of the magnetic material .

In this case, preferably, in the first receiving coil and the second receiving coil, the width in the direction substantially orthogonal to the direction in which the magnetic material extends is larger than the width in the direction in which the magnetic material extends. With this configuration, the portion of the first receiving coil and the second receiving coil in the direction in which the magnetic material extends can be provided so as to be far from the magnetic material. As a result, the contribution of the magnetic material of the first receiving coil and the second receiving coil in the direction in which the magnetic material is extended, which is not desired to contribute to the detection of the magnetic material damage, is reduced. Contributes to the detection of damage to the magnetic material in the portion of the first receiving coil and the second receiving coil that are substantially orthogonal to the extending direction of the magnetic material. The degree can be increased.

In the magnetic material inspection device according to the first aspect , the damaged magnetic material can be easily produced by utilizing the fact that the size of the damaged waveform obtained from the differential coil for detecting the damaged magnetic material is the largest. And it can be identified with certainty.

In the magnetic material inspection apparatus according to the first aspect, preferably, the processing unit makes the magnetic material based on the addition signal obtained by adding the detection signals of each of the determined differential coils among the plurality of differential coils. It is configured to determine whether or not an abnormality has occurred. With this configuration, it is possible to collectively determine anomalies (in a bundled state) for several magnetic materials based on the addition signal, so that one of the several magnetic materials has an abnormality. It is possible to detect that it has occurred. Further, even if the waveform caused by the abnormality is small in each detection signal, the waveform caused by the abnormality can be increased by addition in the addition signal, so that it is possible to detect the occurrence of the abnormality in the magnetic material at an early stage. Can be done.

In this case, preferably, the processing unit is configured to output an abnormality determination signal indicating that an abnormality has occurred in the magnetic material when it is determined that an abnormality has occurred in the magnetic material. With this configuration, the user can know at an early stage that an abnormality has occurred in the magnetic material based on the abnormality determination signal, so that the abnormality that has occurred in the magnetic material can be resolved at an early stage.

The magnetic material inspection system according to the second aspect of the present invention includes a magnetic material inspection apparatus provided with a number equal to or larger than the number of a plurality of magnetic materials and including a plurality of differential coils for detecting the magnetic flux of each of the plurality of magnetic materials. A processing device for acquiring the detection signal of each of the plurality of differential coils is provided, and each of the plurality of differential coils is differentially connected to the first receiving coil and the first receiving coil, and is also provided. It has a detection surface of the first receiving coil and a second receiving coil provided so that the detection surfaces face each other, and when detecting the magnetic flux of each of the plurality of magnetic materials, the first receiving coil and the first receiving coil are provided. A magnetic material is arranged between the two receiving coils, and the processing device corresponds to the detection signal having the largest damage waveform among the detection signals of each of the plurality of differential coils. The magnetic material is configured to identify the magnetic material as a damaged magnetic material .

In the magnetic material inspection system according to the second aspect of the present invention, by configuring as described above, any one of a plurality of magnetic materials can be simplified while simplifying the configuration as in the magnetic material inspection apparatus according to the first aspect. It is possible to provide a magnetic material inspection system capable of determining whether or not the magnetic material of the above is damaged.

In the magnetic material inspection system according to the second aspect, preferably, the processing device is made of a magnetic material based on an addition signal obtained by adding the detection signals of each of the determined differential coils among the plurality of differential coils. It is configured to determine whether or not an abnormality has occurred. With this configuration, similar to the magnetic material inspection device according to the first aspect, it is possible to detect that an abnormality has occurred in one of several magnetic materials, and it is possible to detect that the magnetic material has an abnormality. It is possible to detect the occurrence of an abnormality at an early stage.

According to the present invention, as described above, any of a plurality of magnetic materials can be used while simplifying the shape and structure of the coil, improving the manufacturability of the coil, and suppressing the deterioration of the quality of the coil. It is possible to determine whether or not the damage has occurred.

It is a schematic diagram which shows the structure of the magnetic material inspection system by 1st and 2nd Embodiment. It is a block diagram which shows the structure of the magnetic material inspection apparatus by 1st and 2nd Embodiment. It is a schematic diagram which looked at the state which the magnetic material inspection apparatus by 1st Embodiment inspects a wire rope from the Y direction. It is a schematic diagram which looked at the state which the magnetic material inspection apparatus by 1st Embodiment inspects a wire rope from the Z direction. It is a schematic perspective view which shows the differential coil by 1st Embodiment. It is a schematic perspective view which shows the 1st receiving coil and the 2nd receiving coil of the differential coil according to 1st Embodiment. (A) is a schematic diagram showing a state in which the differential coil wound around the wire rope detects the magnetic flux of the wire rope, and (B) is the differential coil according to the first-order embodiment. Is a schematic diagram showing a state in which the magnetic flux of the wire rope is detected. It is a figure for demonstrating the detection signal of each of the plurality of differential coils according to 1st Embodiment. It is a figure for demonstrating 1st example of addition of the detection signal of the differential coil by 1st Embodiment. It is a figure for demonstrating the 2nd example of addition of the detection signal of the differential coil by 2nd Embodiment.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the magnetic material inspection system 300 according to the first embodiment will be described with reference to FIGS. 1 to 10.

(Structure of magnetic material inspection system)
As shown in FIG. 1, the magnetic material inspection system 300 is a system for inspecting damage (such as wire breakage) of a wire rope W which is an inspection target and a magnetic material. The magnetic material inspection system 300 displays a magnetic material inspection device 100 that measures the magnetic flux of the wire rope W, a display of the measurement result of the magnetic flux of the wire rope W by the magnetic material inspection device 100, and the wire rope W by the magnetic material inspection device 100. It is provided with a processing device 200 that performs analysis based on the measurement result of the magnetic flux of the above. By inspecting the damage of the wire rope W by the magnetic material inspection system 300, it is possible to confirm the damage of the wire rope W which is difficult to visually confirm. The wire rope W is an example of a "magnetic material" in the claims.

The wire rope W is formed by knitting (for example, strand knitting) a magnetic wire material, and is a magnetic material made of a long material extending in the Z direction. The wire rope W is inspected for a state (presence or absence of scratches or the like) by the magnetic material inspection device 100 in order to prevent cutting due to deterioration. As a result of measuring the magnetic flux of the wire rope W, the wire rope W whose degree of deterioration is determined to exceed the determined standard is replaced by the operator.

FIG. 1 shows an example in which the magnetic material inspection device 100 inspects the wire rope W used for moving the car 111 of the elevator 110. The elevator 110 includes a car 111 and a winding machine 112 for driving the wire rope W. The elevator 110 is configured to move the car 111 in the vertical direction (Z direction) by moving the wire rope W by the winding machine 112. The magnetic material inspection device 100 inspects the wire rope W moved by the winding machine 112 in a state of being fixed so as not to move with respect to the wire rope W.

The wire rope W is arranged so as to extend in the Z direction at the position of the magnetic material inspection device 100. The magnetic material inspection device 100 measures the magnetic flux of the wire rope W while moving along the surface of the wire rope W in the Z direction (longitudinal direction of the wire rope W) relative to the wire rope W. When the wire rope W itself moves like the wire rope W used for the elevator 110, the magnetic flux of the wire rope W is measured by the magnetic material inspection device 100 while moving the wire rope W in the Z direction. Will be. As a result, the magnetic flux at each position of the wire rope W in the Z direction can be measured, so that damage can be inspected at each position of the wire rope W in the Z direction.

(Configuration of processing equipment)
As shown in FIG. 1, the processing device 200 is, for example, a personal computer. The processing device 200 is arranged in a space different from the space in which the magnetic material inspection device 100 is arranged. 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 material inspection device 100 and the processing device 200 so as to be communicable. The processing device 200 receives the measurement result (measurement data) of the wire rope W by the magnetic material 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. The processing unit 202 analyzes the damage of the wire rope W such as the wire breakage based on the measurement result of the wire rope W received via the communication unit 201. The storage unit 203 is, for example, a storage medium including a flash memory, and stores (stores) 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, for example, a liquid crystal monitor, and displays information such as a measurement result of the wire rope W and an analysis result of the measurement result of the wire rope W by the processing unit 202.

(Structure of magnetic material inspection device)
As shown in FIG. 2, the magnetic material inspection device 100 includes a detection unit 1 and an electronic circuit unit 2. 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 receiving coils 121 and 122. The excitation coil 11 excites the state of magnetization of the wire rope W. The exciting coil 11 generates a magnetic field along the Y direction (longitudinal direction and axial direction of the wire rope W) inside (inside the ring) by flowing an exciting AC current, and arranges the generated magnetic field inside. It is applied to the wire rope W. The differential coil 12 detects (measures) the magnetic flux in the Y direction of the wire rope W to which the magnetic field is applied by the exciting coil 11. The differential coil 12 transmits a detection signal (differential signal) according to the magnetic flux of the detected wire rope W. A detailed description of the differential coil 12 will be described later. Further, the receiving coils 121 and 122 are examples of the "first receiving coil" and the "second receiving coil" in the claims, respectively.

The electronic circuit unit 2 includes a processing unit 21, a receiving I / F (interface) 22, an excitation I / F 23, a power supply circuit 24, a storage unit 25, and a communication unit 26. The processing unit 21 is configured to control each unit of the magnetic material inspection device 100. The processing unit 21 includes a processor such as a CPU (central processing unit), a memory, an AD converter, and the like. The reception I / F 22 receives the detection signal (differential signal) of the differential coil 12 and transmits it to the processing unit 21. The receiving I / F 22 includes an amplifier. The reception I / F 22 amplifies the detection signal of the differential coil 12 by an amplifier and transmits it to the processing unit 21. The excitation I / F 23 receives a control signal from the processing unit 21. The excitation I / F 23 controls the supply of electric power to the excitation coil 11 based on the received control signal. The power supply circuit 24 receives electric power from the outside and supplies electric power to each part of the magnetic material inspection device 100 such as the excitation coil 11. The storage unit 25 is, for example, a storage medium including a flash memory, and stores (stores) information such as a measurement result (measurement data) of the wire rope W. The communication unit 26 is an interface for communication, and connects the magnetic material inspection device 100 and the processing device 200 so as to be communicable.

(Configuration related to differential coil)
As shown in FIGS. 3 and 4, the elevator 110 (see FIG. 1) is provided with a plurality (8) wire ropes W. The plurality of wire ropes W are provided so as to be arranged in a direction (X direction) substantially orthogonal to each longitudinal direction (Z direction).

The magnetic material inspection device 100 is configured to be able to inspect a plurality of (eight) wire ropes W at the same time. Specifically, the magnetic material inspection device 100 is provided with the same number (8) differential coils 12 as the number of the plurality of wire ropes W. The plurality of differential coils 12 are provided so as to be arranged in the direction (X direction) in which the wire ropes W are arranged. Each of the plurality of differential coils 12 detects the magnetic flux of each of the plurality of wire ropes W and transmits a detection signal corresponding to each of the plurality of wire ropes W. The processing unit 21 acquires the detection signals of each of the plurality of differential coils 12.

Further, the exciting coil 11 is provided so as to surround the plurality of wire ropes W. Further, the excitation coil 11 is configured to simultaneously excite the magnetized states of the plurality of wire ropes W. As a result, the configuration of the magnetic material inspection device 100 can be simplified as compared with the case where the excitation coil is provided for each of the plurality of wire ropes W. Further, the exciting coil 11 is provided so as to surround the plurality of differential coils 12 together with the plurality of wire ropes W. The plurality of wire ropes W and the plurality of differential coils 12 are arranged inside the excitation coil 11 (inside the ring). The plurality of differential coils 12 may be arranged outside the excitation coil 11 (outside the ring). Further, since the plurality of differential coils 12 have substantially the same configuration, one differential coil 12 will be described below unless it is necessary to distinguish them.

Here, in the first embodiment, the differential coils 12 are both planar coils, are differentially connected to each other, and receive coils 121 provided so that the detection surfaces face each other in the Y direction. It has a receiving coil 122. The differential coil 12 is configured such that the wire rope W is arranged in a non-contact manner between the receiving coil 121 and the receiving coil 122 when the magnetic flux of the wire rope W is detected. The receiving coil 121 and the receiving coil 122 are provided so as not to come into contact with the wire rope W when detecting the magnetic flux of the wire rope W. The differential coil 12 is provided so as to output a differential signal between the signal obtained by the receiving coil 121 and the signal obtained by the receiving coil 122 as a detection signal.

As shown in FIG. 5, the receiving coil 121 is a flat coil provided on the printed circuit board PB1 arranged on the Y1 direction side. Specifically, the receiving coil 121 is composed of a spiral conducting wire wound in a plane on the substrate surface of the printed circuit board PB1. Similarly, the receiving coil 122 is a flat coil provided on the printed circuit board PB2 arranged on the Y2 direction side. Specifically, the receiving coil 122 is composed of a spiral conducting wire wound in a plane on the substrate surface of the printed circuit board PB2.

The receiving coil 121 of each of the plurality of differential coils 12 is provided on a single printed circuit board PB1. Similarly, the receiving coils 122 of the plurality of differential coils 12 are both provided on a single printed circuit board PB2. This makes it possible to simplify the configuration of the magnetic material inspection device 100 as compared with the case where the receiving coils 121 (122) of each of the plurality of differential coils 12 are provided on separate printed circuit boards. Further, when the magnetic material inspection device 100 has a structure (structure divided in half) divided into a Y1 direction side and a Y2 direction side, it is possible to facilitate the division of the magnetic material inspection device 100.

As shown in FIG. 6, the end portion of the receiving coil 121 and the end portion of the receiving coil 122 are differentially connected to each other. Specifically, the inner end of the receiving coil 121 and the inner end of the receiving coil 122 are differentially connected to each other. The receiving coil 121 and the receiving coil 122 are configured so that currents flow in opposite directions to each other.

The receiving coil 121 is formed in a substantially rectangular shape when viewed from the Y direction. Specifically, the receiving coil 121 has a longitudinal direction in a direction substantially orthogonal to the direction in which the wire rope W extends (hereinafter, simply referred to as "X direction"), and the direction in which the wire rope W extends (hereinafter, simply "Z"). It is formed in a substantially rectangular shape having a lateral direction (referred to as "direction"). Further, the receiving coil 121 has a width W1 in the X direction and a width W2 in the Z direction. The width W1 is, for example, the width from one end of the receiving coil 121 in the X direction to the other end. The width W2 is, for example, the width from one end of the receiving coil 121 in the Z direction to the other end. The width W1 in the X direction is larger than the width W2 in the Z direction. The width W1 is, for example, about four times the width W2.

The receiving coil 121 has a longitudinal portion 121a which is a conducting wire portion on one side (Z1 direction side) in the Z direction, a longitudinal portion 121b which is a conducting wire portion on the other side (Z2 direction side) in the Z direction, and one side in the X direction. It has a short portion 121c which is a conducting wire portion (X1 direction side) and a short hand portion 121d which is a conducting wire portion on the other side (X2 direction side) in the X direction. The longitudinal portions 121a and 121b are provided so as to extend in the X direction. The short portions 121c and 121d are provided so as to extend in the Z direction. Further, the receiving coil 121 has a non-conducting wire portion 121e in the central portion. The non-conducting wire portion 121e is a space surrounded by the longitudinal portions 121a and 121b and the short portions 121c and 121d.

The receiving coil 122 has a shape corresponding to the receiving coil 121. That is, the receiving coil 122 is formed in a substantially rectangular shape when viewed from the Y direction. Specifically, the receiving coil 122 is formed in a substantially rectangular shape having a longitudinal direction in the X direction and a lateral direction in the Z direction. Further, the receiving coil 122 has a width W3 in the X direction and a width W4 in the Z direction. The width W3 is, for example, the width from one end of the receiving coil 122 in the X direction to the other end. The width W4 is, for example, the width from one end of the receiving coil 122 in the Z direction to the other end. The width W3 in the X direction is larger than the width W4 in the Z direction. The width W3 is, for example, about four times the width W4. The width W3 has the same size as the width W1, and the width W4 has the same size as the width W2.

The receiving coil 122 has a longitudinal portion 122a which is a conducting wire portion on one side (Z1 direction side) in the Z direction, a longitudinal portion 122b which is a conducting wire portion on the other side (Z2 direction side) in the Z direction, and one side in the X direction. It has a short portion 122c which is a conducting wire portion (X1 direction side) and a short hand portion 122d which is a conducting wire portion on the other side (X2 direction side) in the X direction. The longitudinal portions 122a and 122b are provided so as to extend in the X direction. The short portions 122c and 122d are provided so as to extend in the Z direction. Further, the receiving coil 122 has a non-conducting wire portion 122e in the central portion. The non-conducting portion 122e is a space surrounded by the longitudinal portions 122a and 122b and the lateral portions 122c and 122d.

Here, referring to FIGS. 7A and 7B, the differential coil 12 can obtain a detection signal equivalent to that of the differential coil 130 provided so as to be wound around the wire rope W. Will be explained.

As shown in FIG. 7A, the differential coil 130 has a receiving coil 131 that is differentially connected to each other and is provided so as to be wound around the wire rope W, and a receiving coil 132. is doing. The differential coil 130 is provided so as to output a differential signal between the signal obtained by the receiving coil 131 and the signal obtained by the receiving coil 132 as a detection signal.

Further, the receiving coil 131 (132) is formed in a substantially rectangular shape having a longitudinal direction in the X direction and a lateral direction in the Y direction when viewed from the Z direction. The receiving coil 131 (132) has a longitudinal portion 131a (132a) which is a conducting wire portion on one side (Y1 direction side) in the Y direction and a longitudinal portion 131b (longitudinal portion 131b) which is a conducting wire portion on the other side (Y2 direction side) in the Y direction. 132b), the short portion 131c (132c) which is the lead portion on one side (X1 direction side) in the X direction, and the short portion 131d (132d) which is the lead portion on the other side (X2 direction side) in the X direction. And have.

Here, in the differential coil 130, the short portions 131c (132c) and 131d (132d) are provided so as to be sufficiently farther from the wire rope W than the longitudinal portions 131a (132a) and 131b (132b). .. In this case, since the obtained signal is attenuated in proportion to the cube of the distance from the wire rope W, the signals obtained by the short portions 131c (132c) and 131d (132d) become relatively small, and the longitudinal portion 131a The signals obtained by (132a) and 131b (132b) are relatively large.

In other words, the contribution of the short portions 131c (132c) and 131d (132d) to the detection of damage to the wire rope W is small, and the contribution of the long portions 131a (132a) and 131b (132b) to the damage of the wire rope W is small. The contribution to detection increases. As a result, the differential coil 130 substantially outputs the signal obtained by the longitudinal portions 131a and 131b of the receiving coil 131 and the longitudinal portions 132a and 132b of the receiving coil 132 as a detection signal. Specifically, the differential coil 130 is substantially a differential signal between the signal obtained by the longitudinal portions 131a and 131b of the receiving coil 131 and the signal obtained by the longitudinal portions 132a and 132b of the receiving coil 132. Is output as a detection signal.

As shown in FIG. 7B, in the differential coil 12, the short portions 121c (122c) and 121d (122d) are sufficiently farther from the wire rope W than the longitudinal portions 121a (122a) and 121b (122b). It is provided so as to be. In this case, since the obtained signal is attenuated in proportion to the cube of the distance from the wire rope W, the signals obtained by the short portions 121c (122c) and 121d (122d) are relatively small, and the longitudinal portion 121a The signals obtained by (122a) and 121b (122b) are relatively large.

In other words, the contribution of the short portions 121c (122c) and 121d (122d) to the detection of damage to the wire rope W is small, and the damage of the long portions 121a (122a) and 121b (122b) to the wire rope W is reduced. The contribution to detection increases. As a result, the differential coil 12 substantially outputs the signal obtained by the longitudinal portions 121a and 121b of the receiving coil 121 and the 122a and 122b of the receiving coil 122 as a detection signal. Specifically, the differential coil 12 substantially includes the signal obtained by the longitudinal portion 121a of the receiving coil 121 and 122a of the receiving coil 122, and the longitudinal portion 121b of the receiving coil 121 and the longitudinal portion 122b of the receiving coil 122. The differential signal from the signal obtained by is output as a detection signal.

As described above, since the differential coil 12 and the differential coil 130 both obtain a signal substantially only in the longitudinal portion, an equivalent detection signal can be obtained.

(Configuration related to signal processing of detection signal)
As shown in FIG. 8, when a certain wire rope W is damaged, if the differential coils 12 are provided close to each other, not only the differential coil 12 for detecting the damaged wire rope W but also the differential coils 12 are provided. The damaged waveform Wd may also be obtained from the differential coil 12 that detects the undamaged wire rope W near the differential coil 12. Note that FIG. 8 shows an example in which the 1st to 3rd and 5th to 8th wire ropes W are not damaged and the 4th wire rope W is damaged.

Therefore, in the present embodiment, the processing unit 21 is configured to identify the damaged wire rope W based on the magnitude of the damaged waveform Wd of each detection signal of the plurality of differential coils 12. .. Specifically, first, the processing unit 21 extracts the damage waveform Wd of each detection signal of the plurality of differential coils 12, and acquires the magnitude of the extracted damage waveform Wd. The magnitude of the damaged waveform Wd is, for example, the magnitude of the peak of the damaged waveform Wd. Then, the processing unit 21 compares the magnitudes of the damage waveforms Wd of the detection signals of the plurality of differential coils 12. Then, the processing unit 21 uses a wire rope W (fourth wire rope W in FIG. 8) corresponding to the detection signal having the largest damage waveform Wd among the detection signals of the plurality of differential coils 12. , It is configured to identify the damaged wire rope W.

Further, in the present embodiment, as shown in FIGS. 9 and 10, the processing unit 21 is based on an addition signal obtained by adding the detection signals of each of the determined differential coils 12 among the plurality of differential coils 12. Therefore, it is configured to determine whether or not an abnormality has occurred in the wire rope W. The determined differential coil 12 is preset by the user, for example.

For example, as shown in FIG. 9, the processing unit 21 uses all the differential coils 12 among the plurality of differential coils 12 as the determined differential coils 12, and detects each detection signal of all the differential coils 12. Based on the addition signal obtained by adding the above, it is determined whether or not an abnormality has occurred in the wire rope W. As a result, it is possible to collectively determine (in a bundled state) an abnormality for all the wire ropes W. Further, for example, as shown in FIG. 10, the processing unit 21 has determined a part of the differential coils 12 that are continuous in the direction (X direction) in which the differential coils 12 among the plurality of differential coils 12 are arranged. As the differential coil 12, it is determined whether or not an abnormality has occurred in the wire rope W based on the addition signal obtained by adding the detection signals of some of the differential coils 12. Thereby, it is possible to collectively determine the abnormality (in a bundled state) of some of the wire ropes W for which measurement is desired.

Further, the processing unit 21 divides the plurality of differential coils 12 into a plurality of groups and generates an addition signal for each of the plurality of groups. FIG. 10 shows an example in which each addition signal of a plurality of groups including three differential coils 12 is generated. Specifically, in FIG. 10, the group of the first to third differential coils 12, the group of the second to fourth differential coils 12, the group of the third to fifth differential coils 12, and the fourth. An example is shown in which an addition signal of a group of the sixth differential coil 12, a group of the fifth to seventh differential coils 12, and a group of the sixth to eighth differential coils 12 is generated. .. The processing unit 21 determines whether or not an abnormality has occurred in the wire rope W based on the addition signals of each of the plurality of groups. Specifically, the processing unit 21 determines that an abnormality has occurred in the wire rope W corresponding to the addition signal having the largest damage waveform among the addition signals of each of the plurality of groups.

Further, the processing unit 21 is configured to output an abnormality determination signal indicating that an abnormality has occurred in the wire rope W when it is determined that an abnormality has occurred in the wire rope W. For example, the processing unit 21 outputs an abnormality determination signal to the processing device 200, and causes the display unit 204 of the processing device 200 to display that an abnormality has occurred in the wire rope W. As a result, the user can easily confirm that the wire rope W has an abnormality. Further, for example, the processing unit 21 outputs the abnormality determination signal to the device (elevator 110) in which the inspected wire rope W is used, and causes the device to perform an operation (stop operation, etc.) according to the abnormality determination signal. Let me do it.

When the detection signals of all the differential coils 12 are added, a detection signal equivalent to the differential coils provided so as to be wound around all the wire ropes W is obtained as the addition signal. Further, when the detection signals of some of the differential coils 12 are added, the differential coils provided so as to be wound around a part of the wire rope W corresponding to the differential coils 12 to which the detection signals are added. A detection signal equivalent to is obtained as an addition signal.

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

In the first embodiment, as described above, each of the plurality of differential coils 12 is differentially connected to the receiving coil 121, which is a planar coil, and the receiving coil 121, and is detected with the detection surface of the receiving coil 121. It is configured to have a receiving coil 122, which is a planar coil provided so that the surfaces face each other. Then, each of the plurality of differential coils 12 is configured so that the wire rope W is arranged between the receiving coil 121 and the receiving coil 122 when detecting the magnetic flux of each of the plurality of wire ropes W. As a result, both the receiving coil 121 and the receiving coil 122 of the differential coil 12 can be configured by a flat coil. Therefore, when the coil is provided so as to be curved in a U shape or the coil is wound around the wire rope W. The shape and structure of the coil (differential coil 12) can be simplified as compared with the case where the coil (differential coil 12) is provided so as to rotate. Further, unlike the case where the coil is provided so as to be curved in a U shape, it is not necessary to bend the coil, so that the manufacturability of the coil (differential coil 12) can be improved. Further, even when the coil is exposed, the wire rope W and the coil (differential coil 12) are less likely to come into contact with each other as compared with the case where the coil is provided in a U shape so as to surround the wire rope W. Therefore, it is possible to prevent the quality of the coil (differential coil 12) from deteriorating. Further, since the damage of the plurality of wire ropes W can be individually detected by providing the plurality of differential coils 12, it is possible to determine which of the plurality of wire ropes W is damaged. It can be determined. As a result, which of the plurality of wire ropes W is damaged while simplifying the shape and structure of the coil, improving the manufacturability of the coil, and suppressing the deterioration of the quality of the coil. Can be determined.

Further, in the first embodiment, as described above, each of the plurality of differential coils 12 is formed with one side portion (longitudinal portions 121a, 122a) of the receiving coil 121 and the receiving coil 122 in the direction in which the wire rope W extends. The receiving coil 121 and the wire rope W of the receiving coil 122 are provided so as to form a differential coil that outputs a differential signal from the other side portion (longitudinal portions 121b, 122b) in the extending direction. As a result, even when the receiving coil 121 and the receiving coil 122 are planar coils, the receiving coil 121 and the receiving coil 122 can function as the differential coil 12. As a result, the receiving coil 121 and the receiving coil 122 can function as the differential coil 12 while simplifying the configuration of the differential coil 12 by the receiving coil 121 and the receiving coil 122 which are planar coils.

Further, in the first embodiment, as described above, in the receiving coil 121 and the receiving coil 122, the widths (widths W1 and W3) in the direction substantially orthogonal to the direction in which the wire rope W extends are the widths (widths W1 and W3) in the direction in which the wire rope W extends. Make it larger than the width (widths W2, W4). As a result, the portions (short portions 121c, 121d, 122c, 122d) of the receiving coil 121 and the receiving coil 122 in the direction in which the wire rope W extends can be provided so as to be far from the wire rope W. As a result, the portion of the wire rope W in the direction in which the wire rope W extends (short portions 121c, 121d, 122c, 122d) between the receiving coil 121 and the receiving coil 122, which do not want to contribute to the detection of damage to the wire rope W. A portion (longitudinal length) in which the wire rope W of the receiving coil 121 and the receiving coil 122, which is desired to contribute to the detection of damage of the wire rope W while being able to reduce the contribution to the detection of damage, is substantially orthogonal to the extending direction. The contribution of the portions 121a, 121b, 122a, 122b) to the detection of damage to the wire rope W can be increased.

Further, in the first embodiment, as described above, the processing unit 21 identifies the damaged wire rope W based on the magnitude of the damaged waveform Wd of each detection signal of the plurality of differential coils 12. It is configured as follows. Here, when a plurality of differential coils 12 are provided, if the differential coils 12 are provided close to each other, not only the differential coil 12 for detecting the damaged wire rope W but also the differential coil 12 is provided. The damaged waveform Wd may also be obtained from the differential coil 12 that detects the undamaged wire rope W near the. Therefore, by configuring as described above, even when the damage waveform Wd is obtained from the differential coil 12 that detects the wire rope W that is not damaged, the detection signals of each of the plurality of differential coils 12 can be obtained. Since the magnitudes of the damaged waveform Wd can be compared, the damaged wire rope W can be easily identified based on the magnitude of the damaged waveform Wd of each detection signal of the plurality of differential coils 12. ..

Further, in the first embodiment, as described above, the processing unit 21 uses the wire rope W corresponding to the detection signal having the largest damage waveform Wd among the detection signals of the plurality of differential coils 12. It is configured to identify the damaged wire rope W. As a result, the damaged wire rope W can be easily and surely identified by utilizing the fact that the damage waveform Wd obtained from the differential coil 12 for detecting the damaged wire rope W is the largest. be able to.

Further, in the first embodiment, as described above, the processing unit 21 uses the wire rope based on the addition signal obtained by adding the detection signals of each of the determined differential coils 12 among the plurality of differential coils 12. It is configured to determine whether or not an abnormality has occurred in W. As a result, the abnormality can be collectively determined (in a bundled state) for several wire ropes W based on the addition signal, so that an abnormality occurs in any one of the several wire ropes W. It is possible to detect that. Further, even if the waveform caused by the abnormality is small in each detection signal, the waveform caused by the abnormality can be increased by addition in the addition signal, so that the occurrence of the abnormality in the wire rope W can be detected at an early stage. be able to.

Further, in the first embodiment, as described above, when it is determined that an abnormality has occurred in the wire rope W, the processing unit 21 is configured to output an abnormality determination signal indicating that an abnormality has occurred in the wire rope W. do. As a result, the user can know at an early stage that an abnormality has occurred in the wire rope W based on the abnormality determination signal, so that the abnormality that has occurred in the wire rope W can be resolved at an early stage.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. 1 and 2. In this second embodiment, unlike the first embodiment, the processing device identifies the damaged wire rope, and determines whether or not an abnormality has occurred in the wire rope based on the addition signal. explain. The same configuration as that of the first embodiment is shown with the same reference numerals in the drawings, and the description thereof will be omitted.

(Configuration of processing equipment)
As shown in FIG. 1, the magnetic material inspection system 600 is different from the magnetic material inspection system 300 of the first embodiment in that it includes a magnetic material inspection device 400 and a processing device 500. Further, as shown in FIGS. 1 and 2, the magnetic material inspection device 400 and the processing device 500 include the processing unit 321 and the processing unit 502, respectively, in that the magnetic material inspection device 100 and the processing device 100 of the first embodiment are provided. It is different from the device 200.

In the second embodiment, the processing unit 321 of the magnetic material inspection device 400 performs a process of transmitting each detection signal of the plurality of differential coils 12 to the processing device 500 via the communication unit 26. The processing unit 502 of the processing device 500 acquires the detection signals of each of the plurality of differential coils 12 via the communication unit 201. The processing unit 502 of the processing device 500 is configured to identify the damaged wire rope W based on the damage waveform Wd of each detection signal of the plurality of differential coils 12 (see FIG. 8). Further, the processing unit 502 of the processing device 500 determines whether or not an abnormality has occurred in the wire rope W based on the addition signal obtained by adding the detection signals of each of the determined differential coils 12 among the plurality of differential coils 12. It is configured to determine whether or not (see FIGS. 9 and 10). Also in the second embodiment, the method for identifying the damaged wire rope W and the method for determining the abnormality of the wire rope W based on the addition signal are the same as those in the first embodiment. Therefore, detailed description thereof will be omitted.

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

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

In the second embodiment, as described above, the processing apparatus 500 identifies the damaged wire rope W based on the magnitude of the damaged waveform Wd of each detection signal of the plurality of differential coils 12. Configure. Thereby, as in the first embodiment, the damaged wire rope W can be easily identified based on the magnitude of the damaged waveform Wd of each of the detection signals of the plurality of differential coils 12.

Further, in the second embodiment, as described above, the processing device 500 uses the wire rope based on the addition signal obtained by adding the detection signals of each of the determined differential coils 12 among the plurality of differential coils 12. It is configured to determine whether or not an abnormality has occurred in W. As a result, as in the first embodiment, it is possible to detect that an abnormality has occurred in the wire rope W of some of the wire ropes W, and it is possible to detect that the wire rope W has an abnormality. It can be detected early.

The other effects of the second embodiment are the same as those of the first embodiment.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims, not the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

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

Further, in the first and second embodiments, an example is shown in which the magnetic material inspection system is a system for inspecting a wire rope (magnetic material) used in an elevator, but the present invention is not limited to this. In the present invention, the magnetic material inspection system may be a system for inspecting magnetic materials used in cranes, suspension bridges, robots, and the like. When the magnetic material itself does not move, such as a wire rope (magnetic material) used for a suspension bridge, the magnetic flux of the magnetic material by the magnetic material inspection device is moved while the magnetic material inspection device is moved along the magnetic material. It suffices if the measurement of is performed.

Further, in the first and second embodiments, the example in which the magnetic material inspection device is provided with an exciting coil is shown, but the present invention is not limited to this. In the present invention, the magnetic material inspection device does not necessarily have to include an exciting coil.

Further, in the first and second embodiments, an example in which eight differential coils are provided is shown, but the present invention is not limited to this. In the present invention, a plurality of differential coils other than eight may be provided.

Further, in the first and second embodiments, the same number of differential coils as a plurality of wire ropes (magnetic materials) are provided, but the present invention is not limited to this. In the present invention, the number of differential coils may be larger than that of the plurality of magnetic materials. For example, a plurality of differential coils such as two or three may be provided for one magnetic material.

Further, in the first and second embodiments, an example is shown in which a plurality of differential coils are provided so as to be arranged in a direction in which wire ropes (magnetic materials) are arranged, but the present invention is not limited to this. .. In the present invention, the plurality of differential coils may not necessarily be provided so as to be arranged in the direction in which the magnetic materials are arranged. For example, a plurality of differential coils may be provided so as to be displaced in the direction in which the magnetic material extends.

Further, in the first and second embodiments, the example in which the differential coil is formed in a substantially rectangular shape is shown, but the present invention is not limited to this. In the present invention, the differential coil does not necessarily have to be formed in a substantially rectangular shape. For example, the differential coil may be formed in a substantially elliptical shape.

Further, in the first and second embodiments, the processing unit of the magnetic material inspection device or the processing unit of the processing device is damaged based on the magnitude of the damage waveform of each detection signal of the plurality of differential coils. Although an example configured to specify a wire rope (magnetic material) is shown, the present invention is not limited to this. In the present invention, the processing unit of the magnetic material inspection device or the processing unit of the processing device always identifies the damaged magnetic material based on the magnitude of the damage waveform of the detection signal of each of the plurality of differential coils. It does not have to be configured as such.

Further, in the first and second embodiments, the processing unit of the magnetic material inspection device or the processing unit of the processing device adds the detection signals of each of the determined differential coils among the plurality of differential coils. Although an example is shown in which it is configured to determine whether or not an abnormality has occurred in a wire rope (magnetic material) based on a signal, the present invention is not limited to this. In the present invention, the processing unit of the magnetic material inspection device or the processing unit of the processing device does not necessarily have a wire based on an addition signal obtained by adding the detection signals of each of the determined differential coils among the plurality of differential coils. It does not have to be configured to determine whether or not an abnormality has occurred in the rope (magnetic material).

12 Differential coil 121 Receiving coil (first receiving coil)
122 Receiving coil (second receiving coil)
21 Processing unit 100, 400 Magnetic material inspection device 200, 500 Processing device 300, 600 Magnetic material inspection system W Wire rope (magnetic material)
W1 width W2 width W3 width W4 width Wd damage waveform

Claims (7)

A plurality of differential coils provided in a number equal to or larger than the number of a plurality of magnetic materials and detecting the magnetic flux of each of the plurality of magnetic materials, and a plurality of differential coils.
A processing unit for acquiring detection signals of each of the plurality of differential coils is provided.
Each of the plurality of differential coils is differentially connected to the first receiving coil and the first receiving coil, and is provided so that the detection surface and the detection surface of the first receiving coil face each other. It has a second receiving coil, and when detecting the magnetic flux of each of the plurality of magnetic materials, the magnetic material is arranged between the first receiving coil and the second receiving coil. It is configured to
The processing unit identifies the magnetic material corresponding to the detection signal having the largest damage waveform among the detection signals of the plurality of differential coils as the damaged magnetic material. A magnetic material inspection device that is configured . Each of the plurality of differential coils includes a portion of the first receiving coil and the second receiving coil in the direction in which the magnetic body extends, and the first receiving coil and the second receiving coil. The magnetic material inspection apparatus according to claim 1, wherein a differential signal with a portion on the other side in the extending direction of the magnetic material is output. The magnetic material according to claim 2, wherein in the first receiving coil and the second receiving coil, the width in the direction substantially orthogonal to the extending direction of the magnetic material is larger than the width in the direction in which the magnetic material extends. Inspection device. The processing unit is configured to determine whether or not an abnormality has occurred in the magnetic material based on an addition signal obtained by adding the detection signals of each of the determined differential coils among the plurality of differential coils. The magnetic material inspection apparatus according to any one of claims 1 to 3 . The magnetic material inspection according to claim 4 , wherein the processing unit outputs an abnormality determination signal indicating that an abnormality has occurred in the magnetic material when it is determined that an abnormality has occurred in the magnetic material. Device. A magnetic material inspection device provided with a number equal to or larger than the number of a plurality of magnetic materials and provided with a plurality of differential coils for detecting the magnetic flux of each of the plurality of magnetic materials.
A processing device for acquiring the detection signal of each of the plurality of differential coils is provided.
Each of the plurality of differential coils is differentially connected to the first receiving coil and the first receiving coil, and is provided so that the detection surface and the detection surface of the first receiving coil face each other. It has a second receiving coil, and when detecting the magnetic flux of each of the plurality of magnetic materials, the magnetic material is arranged between the first receiving coil and the second receiving coil. It is configured to
The processing device identifies the magnetic material corresponding to the detection signal having the largest damage waveform among the detection signals of the plurality of differential coils as the damaged magnetic material. A magnetic material inspection system that is configured . The processing device is configured to determine whether or not an abnormality has occurred in the magnetic material based on an addition signal obtained by adding the detection signals of each of the determination differential coils among the plurality of differential coils. The magnetic material inspection system according to claim 6 .

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