JP2020132395A - Rope tester for elevator rope - Google Patents

Abstract

To provide a rope tester which can perform magnetic flux detection for diagnosis of both of leakage magnetic flux method and total magnetic flux method at once.SOLUTION: A rope tester for an elevator rope comprises: a magnetization part 3 which magnetizes an elevator rope; a leakage magnetic flux detection part 4 which detects magnetic flux leaking from the rope; and an internal magnetic flux detection part 5 which detects magnetic flux inside the rope.SELECTED DRAWING: Figure 4

Description

The present invention relates to a rope tester for elevator ropes.

Conventionally, for example, a rope tester for an elevator rope has been used for diagnosing an elevator rope using magnetic flux. The diagnosis using magnetic flux includes, for example, a leakage flux method and a total magnetic flux method (for example, Patent Document 1).

The leakage flux method is to detect the magnetic flux leaking from the magnetized rope and diagnose the deterioration of the rope. For example, when the surface of the rope is uneven due to the disconnection of the wire, the magnetic flux leaks from the unevenness. Therefore, the rope is diagnosed (for example, the detection of the disconnection) by detecting the leakage flux. be able to.

On the other hand, the total magnetic flux method detects the magnetic flux passing through the inside of the magnetized rope and diagnoses the deterioration of the rope. For example, when the effective cross-sectional area (cross-sectional area through which magnetic flux can pass) changes due to partial thinning of the rope, corrosion, wear, etc., the magnetic flux passing through the inside of the part changes. By detecting the magnetic flux, the rope can be diagnosed (for example, detection of thinning, corrosion, wear, and disconnection).

By the way, since the principles of the leakage flux method and the total flux method are different, when diagnosing by both methods, a rope tester (for example, Patent Document 2) used for diagnosis by the leakage flux method and a diagnosis by the total flux method are used. It is necessary to prepare a rope tester to be used for. Moreover, since it is necessary to detect the magnetic flux with each rope tester, it is also necessary to perform the work of detecting the magnetic flux twice or to detect the magnetic flux by two people.

Japanese Unexamined Patent Publication No. 2005-248405 Japanese Unexamined Patent Publication No. 2009-91127

Therefore, an object is to provide a rope tester capable of detecting magnetic flux for diagnosis of both the leakage flux method and the total magnetic flux method at one time.

The rope tester of the rope for an elevator includes a magnetizing part that magnetizes the rope for the elevator, a leakage magnetic flux detecting part that detects the magnetic flux leaking from the rope, and an internal magnetic flux detecting part that detects the magnetic flux passing through the inside of the rope. Be prepared.

Further, in the rope tester of the elevator rope, the magnetized portion includes the first and second magnet portions and a magnetic path portion connecting the first magnet portion and the second magnet portion, and the leakage magnetic flux. The detection unit detects the magnetic flux leaking from the rope magnetized by the first and second magnet portions and the magnetic path portion, and the internal magnetic flux detection unit detects the magnetic flux passing through the inside of the magnetic path portion. It may be configured to do.

Further, in the rope tester of the rope for an elevator, the magnetic path portion is the first magnet section in which the first and second separation paths parallel to each other and the first and second separation paths are coupled and connected to the first magnet section. A coupling path and a second coupling path for connecting the first and second separation paths to the second magnet portion are provided, and the cross-sectional area of the first separation path is the cross-sectional area of the second separation path. The internal magnetic flux detecting unit may be smaller than the above, and may be configured to detect the magnetic flux passing through the inside of the first separation path.

FIG. 1 is a perspective view of a rope tester according to an embodiment. FIG. 2 is a front view of the rope tester according to the same embodiment. FIG. 3 is a front view showing a partial vertical cross section of the rope tester according to the same embodiment. FIG. 4 is an enlarged view of a main part of FIG. FIG. 5 is a perspective view of a main part of the rope tester according to the same embodiment. FIG. 6 is a front view of a main part of the rope tester according to the same embodiment.

Hereinafter, an embodiment of an elevator rope in a rope tester will be described with reference to FIGS. 1 to 6. In each drawing, the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratios between the drawings do not necessarily match.

As shown in FIGS. 1 and 2, the rope tester 1 is used for diagnosing the elevator rope X1. A plurality of elevator ropes X1 are usually provided, and the gap between the ropes X1 and X1 is narrow. For example, the gap between the ropes X1 and X1 is 30% to 100% of the outer diameter of the rope X1. Further, for example, the outer diameter of the rope X1 is 8 mm to 16 mm, and the gap between the ropes X1 and X1 is 2.4 mm to 16 mm.

The rope tester 1 includes a main body 2, a magnetizing unit 3 that magnetizes the rope X1, a leakage magnetic flux detecting unit 4 that detects the magnetic flux leaking from the rope X1, and an internal magnetic flux detecting unit that detects the magnetic flux passing through the inside of the rope X1. It has 5 and. Further, the rope tester 1 includes a displacement detection unit 6 that detects a displacement amount with respect to the rope X1. Then, the rope tester 1 outputs the information detected by each of the detection units 4 to 6 to the outside (for example, a diagnostic system that diagnoses the rope X1 based on the information) by wire or wirelessly.

The leakage flux detection unit 4 detects the magnetic flux for the diagnosis of the leakage flux method, and the internal magnetic flux detection unit 5 detects the magnetic flux for the diagnosis of the total magnetic flux method. Further, since the amount of magnetic flux passing through the inside of the rope X1 changes depending on the size (cross-sectional area) of the rope X1, the size of the rope X1 is calculated as the detection value of the internal magnetic flux detection unit 5 on the outside (for example, a diagnostic system). It may be used as information to do so.

The displacement detection unit 6 includes a rotating portion 6a whose outer circumference is in contact with the rope X1, a rotation detecting portion 6b that detects the amount of rotation of the rotating portion 6a, and a rotating portion 6a and a main body portion 2 so that the rotating portion 6a can rotate. It is provided with a connecting portion 6c for connecting to. The configuration of the rotation detection unit 6b is not particularly limited, but for example, the rotation detection unit 6b may be various sensors (for example, an encoder) for detecting the amount of rotation of the rotation unit 6a.

The connecting portion 6c is rotatably connected to the main body portion 2, and the displacement detecting portion 6 includes an elastic portion 6d (shown only in FIG. 2) that applies a force to the connecting portion 6c. There is. As a result, the elastic portion 6d is elastically deformed, so that the rotating portion 6a is in contact with the rope X1 under pressure. The outer peripheral portion of the rotating portion 6a may be formed in a concave shape in order to hook and position the rope X1.

The configuration of the displacement detection unit 6 is not particularly limited as long as it can detect the amount of displacement of the reference position (for example, the end portion, the diagnosis start position) of the rope X1 with respect to the rope tester 1. For example, the rotation unit 6a, the rotation detection unit 6b, the connection unit 6c, and the elastic unit 6d may have different configurations from the configuration according to the present embodiment, or may not be provided. Further, for example, the rope tester 1 does not have to include the displacement detection unit 6.

The main body 2 is formed in a flat plate shape. The main body 2 is provided with a guide portion 2a for guiding the rope X1 at one end, and a grip portion 2b to be gripped at the other end on the opposite side. The guide portion 2a is formed in a concave shape for hooking and positioning the rope X1. Further, the guide portion 2a is formed in a concave shape with a part open. As a result, the rope tester 1 can be brought closer to the rope X1 from the direction in which the adjacent rope X1 does not exist with respect to the rope X1 having a narrow gap, and the rope tester 1 can detect the magnetic flux of the rope X1.

The leakage flux detection unit 4 and the internal magnetic flux detection unit 5 are housed inside the main body 2. The configuration of each magnetic flux detection unit 4 and 5 is not particularly limited. For example, each magnetic flux detection unit 4 and 5 has various magnetic sensors (Hall elements) that convert the magnitude of magnetic flux into the magnitude of voltage (current). , Coil).

Therefore, the main body 2 includes shielding portions 2c and 2c that cover the magnetic flux detecting portions 4 and 5. The shielding portions 2c and 2c are arranged on both sides of the magnetic flux detecting portions 4 and 5. Since the shielding portion 2c has a high magnetic permeability, the shielding portion 2c shields the inside of the main body portion 2 from the external magnetic field. As a result, it is possible to prevent the magnetic flux due to the external magnetic field from being detected by the magnetic flux detection units 4 and 5.

As shown in FIGS. 2 to 4, the magnetizing portion 3 includes the first and second magnet portions 3a and 3b, and the magnetic path portion 7 that magnetically connects the first magnet portion 3a and the second magnet portion 3b. It has. Then, the first and second magnet portions 3a and 3b and the magnetic path portion 7 form a magnetic circuit by cooperating with the rope X1. That is, the magnetic circuit is composed of the first magnet portion 3a, the second magnet portion 3b, the magnetic path portion 7, and the rope X1 (see the solid line arrow in FIG. 4).

The configuration of each magnet portion 3a, 3b is not particularly limited, but for example, each magnet portion 3a, 3b may be a permanent magnet or an electromagnet. The material of the magnetic path portion 7 is not particularly limited, but the magnetic path portion 7 has a high magnetic permeability, and may be formed of, for example, pure iron or low carbon steel.

Further, the shielding portion 2c is arranged so as to cover a part of the magnetizing portion 3. For example, the shielding portion 2c is detached from the first magnet portion 3a and the second magnet portion 3b so as not to overlap the first magnet portion 3a and the second magnet portion 3b in the directional view sandwiched by the pair of shielding portions 2c, 2c. Are arranged. According to such a configuration, the change in the magnetic flux detected by the internal magnetic flux detecting unit 5 becomes large as the effective cross section of the rope X1 changes. Therefore, the change in the effective cross section of the rope X1 can be easily detected. The shielding portion 2c may be arranged so as to cover the entire magnetizing portion 3.

Then, the leakage flux detection unit 4 detects the magnetic flux leaking from the rope X1 magnetized by the first and second magnet units 3a and 3b and the magnetic path portion 7. The main body 2 includes a magnetic part 2d arranged so as to cover the rope X1 in order to collect the leakage flux from the rope X1, and the leakage flux detecting part 4 has a magnetic flux passing through the inside of the magnetic part 2d. Is being detected.

The magnetic portion 2d constitutes a part of the guide portion 2a. Specifically, the guide portion 2a is composed of a magnetic portion 2d and a non-magnetic portion 2e having a magnetic permeability lower than that of the magnetic portion 2d. The magnetic portion 2d and the non-magnetic portion 2e are connected to each other.

The material of the magnetic portion 2d is not particularly limited, but the magnetic portion 2d is formed of a magnetic material and has a high magnetic permeability, and may be formed of, for example, pure iron or low carbon steel. The material of the non-magnetic portion 2e is not particularly limited, but the non-magnetic portion 2e is formed of a non-magnetic material and has a low magnetic permeability, and may be formed of, for example, bronze or a hard resin.

Further, for example, the magnetic permeability of the magnetic portion 2d is preferably 100 times or more, and more preferably 1000 times or more, the magnetic permeability of the non-magnetic portion 2e. Further, for example, the magnetic permeability of the magnetic portion 2d is preferably 100 times or more, more preferably 1000 times or more, the magnetic permeability of the atmosphere.

Then, as shown in FIGS. 5 and 6, the magnetic portion 2d includes end portions 2f and 2f, and a connecting portion 2g that connects the end portions 2f and the leakage flux detecting portion 4. The tip of the end portion 2f is formed in a concave shape to form the guide portion 2a, and the connecting portion 2g is connected to the base end of the end portion 2f and extends along the rope X1 (guide portion 2a). There is. As a result, the magnetic portion 2d covers the portion of the rope X1 between the end portions 2f and 2f.

By the way, as shown in FIG. 6, when the rope X1 has a broken portion, a large unevenness is present on the surface of the rope X1, so that a large magnetic flux leaks from the broken portion of the rope X1. When the broken portion of the rope X1 is located between the end portions 2f and 2f, the magnetic flux leaked from the broken portion is collected by the magnetic portion 2d, and the leakage flux detecting portion 4 passes through the inside of the magnetic portion 2d. Detect magnetic flux. Therefore, the leakage flux from the rope X1 can be reliably detected. In addition, for example, the main body portion 2 may be configured not to include the magnetic portion 2d.

Returning to FIG. 4, the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the rope X1 by detecting the magnetic flux passing through the inside of the magnetic path portion 7. As a result, the configuration in which the leakage magnetic flux detecting unit 4 magnetizes the rope X1 in order to detect the magnetic flux and the configuration in which the internal magnetic flux detecting unit 5 magnetizes the rope X1 in order to detect the magnetic flux are shared. ..

Therefore, the portion of the rope X1 in which the internal magnetic flux detecting unit 5 detects the magnetic flux overlaps with the portion of the rope X1 in which the leakage flux detecting unit 4 detects the magnetic flux. In the present embodiment, the internal magnetic flux detection unit 5 detects the entire portion of the magnetized rope X1, and the leakage flux detection unit 4 detects the magnetic portion 2d of the magnetized rope X1. The covered part is detected.

In this way, the magnetic fluxes for diagnosis of both the leakage flux method and the total magnetic flux method are detected not only at once but also the magnetic fluxes of the portions corresponding to each other. As a result, for example, when diagnosing the rope X1, not only the detection values of the magnetic flux detection units 4 and 5 are individually diagnosed, but also the detection value of the leakage flux detection unit 4 and the detection value of the internal magnetic flux detection unit 5 May be associated and comprehensively diagnosed.

Further, the magnetic path portion 7 is a first coupling path 7c that connects the first and second separation paths 7a and 7b and the first and second separation paths 7a and 7b to be connected to the first magnet portion 3a. And a second coupling path 7d that connects the first and second separation paths 7a and 7b to the second magnet portion 3b. As a result, the magnetic flux passing through the inside of the rope X1 is divided into the first separation path 7a and the second separation path 7b.

Then, the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the first separation path 7a of the magnetic path unit 7. The amount of magnetic flux passing through the inside of the rope X1 is proportional to the amount of magnetic flux passing through the inside of the first separation path 7a. Thereby, by detecting the magnetic flux passing through the inside of the first separation path 7a, the magnetic flux passing through the inside of the rope X1 can be detected.

Therefore, the internal magnetic flux detection unit 5 does not have to be arranged around the guide unit 2a. As a result, it is possible to prevent one end of the main body portion 2, that is, the guide portion 2a from becoming thick. Therefore, it can be used even for the rope X1 having a narrow gap. The internal magnetic flux detection unit 5 is arranged at a distance from the leakage flux detection unit 4 with respect to the guide unit 2a. That is, the internal magnetic flux detecting unit 5 is arranged at a distance from the leakage flux detecting unit 4 with respect to the rope X1.

By the way, the leakage magnetic flux detecting unit 4 detects the magnetic flux leaked from the rope X1, while the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the rope X1. Therefore, the magnitudes of the magnetic fluxes targeted by the magnetic flux detection units 4 and 5 are different. For example, the magnitude of the magnetic flux targeted by the leakage flux detecting unit 4 is 2% to 3% of the magnitude of the magnetic flux targeted by the internal magnetic flux detecting unit 5.

Therefore, the cross-sectional area of the first separation path 7a is smaller than the cross-sectional area of the second separation path 7b, and the internal magnetic flux detection unit 5 detects the magnetic flux passing through the inside of the first separation path 7a. .. As a result, the magnetic flux value actually detected by the internal magnetic flux detection unit 5 becomes smaller. Therefore, for example, the size of the internal magnetic flux detection unit 5 can be reduced, the internal magnetic flux detection unit 5 can be a general-purpose (commercially available) magnetic sensor, or the same sensor as the leakage flux detection unit 4 can be used. Can be done.

The number of separation paths 7a and 7b is not particularly limited, but in the present embodiment, the number of separation paths 7a and 7b is two. In a configuration in which the number of separation paths 7a and 7b is three or more, it is preferable that the internal magnetic flux detection unit 5 detects the magnetic flux passing through the inside of the separation path 7a other than the separation path 7b having the largest cross section. ..

By the way, the first separation path 7a includes a pair of long portions 7e and 7e that sandwich the internal magnetic flux detecting portion 5, and a holding portion 7f that holds each long portion 7e. The base end portion of each long portion 7e is held by the connecting paths 7c and 7d, and the tip end portion of each long portion 7e is held by the holding portion 7f. The tips of the pair of long portions 7e and 7e are held by one holding portion 7f.

As a result, it is possible to prevent the pair of long portions 7e and 7e from being displaced from each other as compared with the configuration in which the tip portions of the long portions 7e are held by separate members. Therefore, for example, it becomes easy to limit the measurement point of the magnetic flux (magnetic flux density) of the internal magnetic flux detection unit 5 to the gap between the long portions 7e and 7e, so that the internal magnetic flux detection between the rope testers 1 and 1 can be easily performed. Performance Individual differences can be reduced.

Further, for example, by making the width of the gap between the long portions 7e and 7e the same, it is possible to further reduce the individual difference in the performance of the internal magnetic flux detection between the rope testers 1 and 1. These effects are exhibited by, for example, a rope tester 1 that employs an internal magnetic flux detection unit 5 composed of a Hall element, a magnetoresistive element (MR element), and the like. The holding portion 7f is made of a non-magnetic material and is fixed to the second separation path 7b.

Further, the rope tester 1 includes a substrate 8 that is electrically connected to the magnetic flux detection units 4 and 5 by a conductive material (for example, an electric wire or a bus bar) (not shown). The substrate 8 is arranged inside the main body 2, and is arranged between the leakage flux detecting unit 4 and the internal magnetic flux detecting unit 5. Then, each magnetic flux detection unit 4 and 5 outputs the detected value to the outside via the substrate 8.

From the above, the rope tester 1 of the elevator rope X1 according to the present embodiment includes a magnetizing portion 3 that magnetizes the elevator rope X1, a leakage magnetic flux detecting portion 4 that detects the magnetic flux leaking from the rope X1, and the rope X1. The internal magnetic flux detecting unit 5 for detecting the magnetic flux passing through the inside of the above is provided.

According to such a configuration, the leakage magnetic flux detecting unit 4 detects the magnetic flux leaking from the magnetized rope X1, and the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the magnetized rope X1. Thereby, the magnetic flux for diagnosis of both the leakage flux method and the total magnetic flux method can be detected at once.

Further, in the rope tester 1 of the elevator rope X1 according to the present embodiment, the magnetizing portion 3 includes the first and second magnet portions 3a and 3b, and the first magnet portion 3a and the second magnet portion 3b. The leakage magnetic flux detecting unit 4 includes a magnetic path portion 7 to be connected, and detects the magnetic flux leaking from the rope X1 magnetized by the first and second magnet portions 3a and 3b and the magnetic path portion 7. However, the internal magnetic flux detecting unit 5 has a configuration of detecting the magnetic flux passing through the inside of the magnetic path unit 7.

According to such a configuration, the first and second magnet portions 3a and 3b and the magnetic path portion 7 form a magnetic circuit by cooperating with the rope X1. Then, the leakage flux detection unit 4 detects the magnetic flux leaking from the rope X1 magnetized by the first and second magnet units 3a and 3b and the magnetic path portion 7. Further, the internal magnetic flux detecting unit 5 can detect the magnetic flux passing through the inside of the rope X1 by detecting the magnetic flux passing through the inside of the magnetic path portion 7.

Further, in the rope tester 1 of the elevator rope X1 according to the present embodiment, the magnetic path portions 7 are arranged in parallel with the first and second separation paths 7a and 7b and the first and second separation paths 7a and 7b. A first coupling path 7c for coupling and connecting to the first magnet portion 3a, and a second coupling path 7d for coupling the first and second separation paths 7a and 7b and connecting them to the second magnet portion 3b. The cross-sectional area of the first separation path 7a is smaller than the cross-sectional area of the second separation path 7b, and the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the first separation path 7a. , Is the configuration.

According to such a configuration, the magnetic flux passing through the inside of the rope X1 is separated into the first separation path 7a and the second separation path 7b. Since the cross section of the first separation path 7a is smaller than the cross section of the second separation path 7b, the magnetic flux value actually detected by the internal magnetic flux detection unit 5 can be reduced. The amount of magnetic flux passing through the inside of the rope X1 is proportional to the amount of magnetic flux passing through the inside of the first separation path 7a. Thereby, by detecting the magnetic flux passing through the inside of the first separation path 7a, the magnetic flux passing through the inside of the rope X1 can be detected.

The rope tester 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-mentioned action and effect. Further, it goes without saying that the rope tester 1 can be modified in various ways without departing from the gist of the present invention. For example, it goes without saying that one or a plurality of configurations and methods according to the following various modification examples may be arbitrarily selected and adopted for the configurations and methods according to the above-described embodiment.

(1) In the rope tester 1 according to the above embodiment, the rope X1 is configured to magnetize the rope X1 in order for the leakage flux detecting unit 4 to detect the magnetic flux, and the rope X1 for the internal magnetic flux detecting unit 5 to detect the magnetic flux. The configuration that magnetizes the rope is a configuration that is also used. However, the rope tester 1 is not limited to such a configuration, although such a configuration is preferable.

For example, the configuration in which the leakage magnetic flux detecting unit 4 magnetizes the rope X1 to detect the magnetic flux is different from the configuration in which the internal magnetic flux detecting unit 5 magnetizes the rope X1 in order to detect the magnetic flux. It may be configured. Specifically, a pair of magnets that magnetize the rope X1 for the leakage flux detection unit 4 to detect the magnetic flux, and a pair of magnets that magnetize the rope X1 for the internal magnetic flux detection unit 5 to detect the magnetic flux. The structure may be different from that of the part.

(2) Further, in the rope tester 1 according to the above embodiment, the internal magnetic flux detecting unit 5 detects the magnetic flux passing through the inside of the magnetic path portion 7, that is, indirectly detects the magnetic flux passing through the inside of the rope X1. It is a structure to do. However, the rope tester 1 is not limited to such a configuration, although such a configuration is preferable. For example, the internal magnetic flux detection unit 5 may be arranged in the guide unit 2a to directly detect the magnetic flux passing through the inside of the rope X1.

(3) Further, in the rope tester 1 according to the above embodiment, the magnetic path portion 7 is provided with a plurality of separation paths 7a and 7b in parallel, whereby a plurality of paths are provided. Is. However, the rope tester 1 is not limited to such a configuration, although such a configuration is preferable. For example, the magnetic path portion 7 may be configured to include only one path.

(4) Further, in the rope tester 1 according to the above embodiment, the cross section of the first separation path 7a detected by the internal magnetic flux detection unit 5 is smaller than the cross section of the second separation path 7b. is there. However, the rope tester 1 is not limited to such a configuration, although such a configuration is preferable. For example, the cross-sectional area of the first separation path 7a detected by the internal magnetic flux detection unit 5 may be equal to or larger than the cross-sectional area of the second separation path 7b.

(5) Further, the rope tester 1 includes a selection unit capable of selecting a detection value to be output to the outside from the detection value of the leakage flux detection unit 4 and the detection value of the internal magnetic flux detection unit 5. It may be configured as. According to such a configuration, only necessary detection values can be output.

1 ... Rope tester, 2 ... Main body, 2a ... Guide, 2b ... Grip, 2c ... Shielding, 2d ... Magnetic, 2e ... Non-magnetic, 2f ... End, 2g ... Connecting, 3 ... Magnetized 3, 3a ... 1st magnet unit, 3b ... 2nd magnet unit, 4 ... Leakage magnetic flux detection unit, 5 ... Internal magnetic flux detection unit, 6 ... Displacement detection unit, 6a ... Rotation unit, 6b ... Rotation detection unit, 6c ... Connection unit , 6d ... elastic part, 7 ... magnetic path part, 7a ... first separation path, 7b ... second separation path, 7c ... first connection path, 7d ... second connection path, 7e ... long part, 7f ... holding part , 8 ... board, X1 ... rope

Claims (3)

The magnetizing part that magnetizes the elevator rope and
A leakage flux detection unit that detects the magnetic flux leaking from the rope,
A rope tester for an elevator rope, comprising an internal magnetic flux detection unit that detects magnetic flux passing through the inside of the rope. The magnetized portion includes first and second magnet portions, and a magnetic path portion that connects the first magnet portion and the second magnet portion.
The leakage flux detecting unit detects the magnetic flux leaking from the rope magnetized by the first and second magnet portions and the magnetic path portion, and detects the magnetic flux leaking from the rope.
The rope tester for an elevator rope according to claim 1, wherein the internal magnetic flux detecting unit detects a magnetic flux passing through the inside of the magnetic path portion. The magnetic path portion includes a first and second separation paths that are parallel to each other, a first coupling path that connects the first and second separation paths to the first magnet section, and a first and second separation path. A second coupling path for coupling and connecting to the second magnet portion,
The cross section of the first separation path is smaller than the cross section of the second separation path.
The rope tester for an elevator rope according to claim 2, wherein the internal magnetic flux detecting unit detects the magnetic flux passing through the inside of the first separation path.

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