WO2016143088A1

WO2016143088A1 - Rope damage diagnostic examination device and rope damage diagnostic examination method

Info

Publication number: WO2016143088A1
Application number: PCT/JP2015/057145
Authority: WO
Inventors: 甚井上; 白附　晶英; 関　真規人; 孝吉岡; 豊弘野口
Original assignee: 三菱電機株式会社
Priority date: 2015-03-11
Filing date: 2015-03-11
Publication date: 2016-09-15
Also published as: CN107430090A; KR20170120167A; KR102020974B1; JPWO2016143088A1; JP6289732B2; CN107430090B; DE112015006279B4; DE112015006279T5

Abstract

This rope damage diagnostic examination device is provided with: a first yoke that applies a magnetic field for putting a rope in a magnetically saturated state; an AC magnetic field applicator that, by the supplying of a fixed current to an axially oriented coil, applies an AC magnetic field to the rope in the axial direction thereof and thereby generates an eddy current and an eddy current magnetic field in the rope; and a controller that, during application of the AC magnetic field to the rope that has been put in a magnetically saturated state by the first yoke, detects the presence of a breakage in the rope from the result of measuring the magnitude of leakage flux of the rope, calculates the cross-sectional area of the rope from the result of measuring a voltage that fluctuates due to the eddy current magnetic field generated in the axial direction of the rope, and performs an examination for a shape abnormality in the rope from the presence or absence of a breakage and the cross-sectional area.

Description

Rope damage diagnostic inspection apparatus and rope damage diagnostic inspection method

The present invention relates to an elevator rope damage diagnosis inspection apparatus and an elevator rope damage diagnosis inspection method for inspecting a breakage or a diameter reduction of a rope for hanging an elevator cage.

There is a conventional technique for detecting rope damage using an E-shaped iron core (see, for example, Patent Document 1). The E-shaped iron core (3) in Patent Document 1 has three leg portions (31, 32, 33), and U-shaped grooves (31U, 32U, 33U) are formed on the bottom surfaces thereof. Has been. Further, excitation coils (41, 42) are wound around the iron core (3), and a detection coil (43) is wound around the leg portion (33).

At the time of inspection, the wire rope (2) to be inspected is fitted in the grooves (31U, 32U, 33U), and the iron core (3) is connected to the exciting coils (41, 42). ) Along the wire rope (2). And when a leg part (33) passes the damaged part (21) of a wire rope (2), a damaged part (21) can be detected because a voltage generate | occur | produces in a detection coil (43).

In this Patent Document 1, since the iron core is excited by an AC power source, even if the iron core stops, the wire rope in that portion is not magnetized, and accurate and highly reliable flaw detection can be performed.

JP-A-10-19852

However, the prior art has the following problems.
In Patent Document 1, the output generated from the detection coil changes depending on the magnetic characteristics of the rope in addition to the shape of the damage. Therefore, although damage can be detected, other than damage may be detected due to variations in the magnetic characteristics of the rope.

In other words, such a conventional technique may detect a variation in the magnetic characteristics of the rope, not an abnormality in the shape of the rope (wire breakage, diameter reduction). As a result, there has been a problem that the detection accuracy is lowered or it is difficult to quantify the degree of damage.

The present invention has been made in order to solve the above-described problems, and quantitatively detects a rope shape abnormality more accurately than the prior art without depending on variations in magnetic characteristics. An object of the present invention is to obtain a rope damage diagnosis and inspection apparatus and a rope damage diagnosis and inspection method.

A rope damage diagnosis and inspection apparatus according to the present invention is a rope damage diagnosis and inspection apparatus that inspects an abnormality in the shape of a rope that suspends an elevator car. The rope damage diagnosis and inspection apparatus is attached to a rope and uses a magnetic field for bringing the rope into a magnetic saturation state. The first yoke to be applied, the first alternating current source that outputs a constant alternating current, and the axial coil are configured to supply a constant current from the first alternating current source to the axial coil. By applying an AC magnetic field to the axial direction of the rope, an AC magnetic field applicator that generates an eddy current and an eddy current magnetic field in the rope, and a leak that measures the leakage magnetic flux of the rope during the application of the AC magnetic field Control the AC magnetic field applicator for the magnetic flux measuring instrument, the first voltage measuring instrument that measures the voltage of the axial coil during application of the AC magnetic field, and the rope that is magnetically saturated by the first yoke. A value proportional to the voltage from the voltage measured by the first voltage measuring device is detected by detecting whether or not the rope is broken from the magnitude of the leakage magnetic flux measured by the leakage magnetic flux measuring device. And a controller for calculating the cross-sectional area of the rope and inspecting the rope for abnormal shape from the presence / absence of breakage and the cross-sectional area.

The rope damage diagnosis and inspection method according to the present invention is a rope damage diagnosis and inspection method for inspecting an abnormality in the shape of a rope that suspends an elevator car, and applies a magnetic field to the rope to make the rope magnetically saturated. A second step of applying an alternating magnetic field to the rope that has become magnetically saturated, a third step of measuring the leakage flux of the rope during application of the alternating magnetic field, and the measured leakage flux A fourth step for detecting the presence or absence of a rope break from the magnitude of the wire, a fifth step for measuring a voltage fluctuating due to an eddy current magnetic field generated in the axial direction of the rope during application of an alternating magnetic field, and a measured voltage The sixth step of calculating the cross-sectional area of the rope as a value proportional to the value, the detection result of the presence or absence of breakage in the fourth step, and the calculation result of the cross-sectional area in step 6 From those having a seventh step of determining the abnormal shape of the rope.

According to the present invention, an alternating magnetic field is applied to a rope that is in a magnetic saturation state, and during the application of the alternating magnetic field, the presence or absence of a rope breakage is detected from the measurement result of the magnitude of the leakage magnetic flux of the rope. The cross-sectional area of the rope is calculated from the measurement result of the voltage that fluctuates due to the eddy current magnetic field generated in the axial direction, and the configuration of the rope is inspected for the presence of breakage and the cross-sectional area. As a result, it is possible to obtain a rope damage diagnostic inspection apparatus and a rope damage diagnostic inspection method capable of detecting a rope shape abnormality quantitatively and with higher accuracy than conventional techniques without depending on variations in magnetic characteristics. Can do.

It is a block diagram of the rope damage diagnostic inspection apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the principle of the disconnection detection in Embodiment 1 of this invention. It is the figure which showed the 1st magnetic characteristic of the rope in Embodiment 1 of this invention. It is the figure which showed the 2nd magnetic characteristic of the rope in Embodiment 1 of this invention. In Embodiment 1 of this invention, it is a figure for demonstrating the relationship between the penetration | invasion of the eddy current in the rope 1 in the state of a rope without a magnetic field, and the strength of a magnetic field. In Embodiment 1 of this invention, it is a figure for demonstrating the relationship between the penetration | invasion of the eddy current in the rope 1 in the state of a strong magnetic field, and the strength of a magnetic field. It is a block diagram of the rope damage diagnostic inspection apparatus in Embodiment 2 of this invention. It is a figure for demonstrating the principle of the disconnection detection in Embodiment 2 of this invention. It is the flowchart which showed the series of processes of the fracture | rupture detection and cross-sectional area measurement in Embodiment 2 of this invention. It is a block diagram of the rope damage diagnostic inspection apparatus in Embodiment 3 of this invention. It is a perspective view of the axial coil in Embodiment 3 of this invention.

Hereinafter, preferred embodiments of the rope damage diagnosis and inspection apparatus and the rope damage diagnosis and inspection method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a rope damage diagnosis and inspection apparatus according to Embodiment 1 of the present invention. The rope damage diagnosis / inspection apparatus according to the first embodiment includes a first yoke 10, a second yoke 20, an axial coil 30, a magnetic sensor array 40, an alternating current source 50, and a voltage measuring device 60. .

The first yoke 10 is a yoke for applying a first magnetic field to the rope 1 by being attached to the rope 1 to be inspected, and includes a magnet 11. When the permanent magnet 11a is used as the magnet 11, a direct current magnetic field is applied to the rope 1 via the first yoke 10 as a first magnetic field, whereby the rope 1 can be magnetically saturated. .

When the electromagnet 11b is used as the magnet 11, a pulse magnetic field is applied as a first magnetic field to the rope 1 via the first yoke 10, and this also magnetically saturates the rope 1. Can do. Hereinafter, a case where a DC magnetic field is applied will be described as an example.

The second yoke 20 is a yoke for applying an alternating magnetic field to the rope 1. Specifically, by supplying a constant alternating current from the alternating current source 50 to the axial coil 30 wound around the second yoke 20, the alternating magnetic field is applied to the rope 1 via the second yoke 20. Can be applied. As a result, an eddy current is generated in the rope 1 and an eddy current magnetic field due to the eddy current is also generated.

The magnetic sensor array 40 is a leakage flux measuring instrument that measures the leakage flux of the eddy current magnetic field from the breaking portion of the rope 1 and detects the breaking when an alternating magnetic field is applied via the second yoke 20. Here, the direction of the magnetic field detected using the magnetic sensor array 40 may be not only the radial direction but also the axial direction and the circumferential direction. Details of the principle of break detection will be described later.

In addition, as such a leakage magnetic flux measuring instrument, a Hall element, a magnetoresistive element (AMR, GMR, TMR), or a coil can be used instead of the magnetic sensor array 40. Furthermore, when a coil is used as the leakage flux measuring instrument, a single coil may be used.

The voltage measuring device 60 measures the voltage V of the axial coil 30 that fluctuates due to the eddy current magnetic field when an AC magnetic field is applied via the second yoke 20, and measures the cross-sectional area S of the rope 1 proportional to the voltage V. Details of the principle of cross-sectional area measurement will be described later.

Although not shown in FIG. 1, the rope damage diagnostic inspection apparatus according to the first embodiment has a controller 70. Then, the controller 70 controls the output from the AC current source 50, and executes the break detection process and the cross-sectional area measurement process based on the measurement results by the magnetic sensor array 40 and the voltage measuring device 60.

Next, the principle of fracture detection and the principle of cross-sectional area measurement executed by the rope damage diagnosis and inspection apparatus according to the first embodiment will be described in detail with reference to the drawings.

<About the principle of break detection>
FIG. 2 is a diagram for explaining the principle of disconnection detection in the first embodiment of the present invention. Specifically, an explanatory diagram showing a state in which the magnetic sensor array 40 detects a change in an eddy current magnetic field. It is.

When an AC magnetic field is applied to the rope 1 through the second yoke 20, an eddy current flows in the circumferential direction of the rope 1 due to electromagnetic induction. And when there exists a fracture | rupture location of the rope 1 as shown as "A part" in the center part of FIG. 2, the flow path of eddy current will change. As a result, the “eddy current magnetic field” corresponding to the magnetic field generated by the eddy current varies.

Therefore, the controller 70 according to the first embodiment of the present invention measures the change of the eddy current magnetic field by the magnetic sensor array 40, and when the magnitude of the change deviates from the allowable value, the rope 70 It can be detected that 1 breakage has occurred.

<About the principle of cross-sectional area measurement>
The AC magnetic flux in the rope 1 by the axial coil 30 is proportional to the rope cross-sectional area and the rope permeability μ. Here, the rope 1 is mainly made of iron, and its magnetic properties change depending on the temperature, material, rolling, etc. during manufacture. Also, the magnetic characteristics change depending on the tension applied to the rope.

FIG. 3 is a diagram showing a first magnetic characteristic of the rope 1 according to the first embodiment of the present invention. Specifically, the first magnetic characteristic shown in FIG. 3 is a magnetic characteristic by a BH curve in which the horizontal axis represents the applied magnetic field H and the vertical axis represents the magnetic field in the rope 1.

FIG. 4 is a diagram showing a second magnetic characteristic of the rope 1 according to the first embodiment of the present invention. Specifically, the second magnetic characteristic shown in FIG. 4 is a magnetic characteristic based on a μ-H curve with the applied magnetic field H on the horizontal axis and the permeability μ on the vertical axis. The magnetic permeability μ corresponds to the slope of the BH curve shown in FIG.

As described above as a problem of the prior art, the magnetic permeability μ in the applied magnetic field H1 shown in FIG. 4 is affected by the magnetic characteristics of each rope 1 and varies greatly. In order to solve such a problem, in the first embodiment, the internal magnetic flux of the rope 1 is saturated by applying a DC magnetic field, and the applied magnetic field H2 shown in FIG. 4 is obtained. As a result, the controller 70 can measure the cross-sectional area in a state where the variation of the magnetic permeability μ is small and the influence of the magnetic characteristics that are different for each rope 1 is suppressed.

Therefore, in the first embodiment, first, a DC magnetic field is applied to the rope 1 via the first yoke 10 to saturate the internal magnetic flux B of the rope 1. Thereby, irrespective of the magnetic characteristics and dimensions of the rope 1, the permeability μ corresponding to the differential value of the magnetic flux B can be made substantially constant as shown in FIG.

Next, the controller 70 can obtain the cross-sectional area S from the following calculation formula (1) regarding the axial coil 30.
L = n × φ = n × μH _rf × S (1)
Here, n is the number of coil turns per unit length, and H _rf is an AC magnetic field.

In the first embodiment, the controller 70 controls the axial coil 30 wound around the second yoke 20 so that a constant alternating current is supplied from the alternating current source 50. As a result, n × μH _rf in the above equation (1)
Can be a known constant value. Therefore, the controller 70 can measure a value proportional to the cross-sectional area S by measuring the voltage V of the axial coil 30 with the voltage measuring device 60.

Note that applying a DC magnetic field to saturate the internal magnetic flux B of the rope 1 not only enables the measurement of the cross-sectional area S but also detects the breakage of the rope 1 based on the measurement result of the change in the eddy current magnetic field. The fact that it contributes to the improvement of detection accuracy when performing the following will be described.

Since the eddy current magnetic field is generated by the electromagnetic induction action of the exciting magnetic field by the axial coil 30, it is generated in the direction to cancel the exciting magnetic field. Therefore, the exciting magnetic field that reaches the inside of the rope 1 becomes smaller as the inside of the rope is reduced by the eddy current magnetic field. As a result, the eddy current becomes smaller toward the inside of the rope 1.

The depth (skin depth) δ at which the magnitude of the eddy current decreases to 1 / e from the value on the rope surface is expressed by the following equation (2).
δ = 1 / √ (π × μ × σ × f) (2)
Here, each coefficient in the above equation (2) is as follows.
π: Circumference μ: Magnetic permeability σ: Electrical conductivity f: Frequency of excitation magnetic field

Therefore, as is clear from the above equation (2), the eddy current can penetrate deeper into the rope 1 as the permeability μ is smaller. FIG. 5 is a diagram for explaining the relationship between the penetration of eddy currents into the rope 1 and the strength of the magnetic field when the rope 1 is in a state of no magnetic field in the first embodiment of the present invention. On the other hand, FIG. 6 is a diagram for explaining the relationship between the penetration of eddy currents into the rope 1 and the strength of the magnetic field when the rope 1 is in a strong magnetic field in the first embodiment of the present invention. .

As shown in FIG. 5, in the absence of a magnetic field, the permeability μ is large, so that the skin depth δ obtained by the above equation (2) becomes shallow. As a result, the AC magnetic field and eddy current cannot enter the inside of the rope 1, and there is a possibility that a state where the eddy current does not reach the defect position may occur.

On the other hand, as shown in FIG. 6, since the magnetic permeability μ is small in a strong magnetic field, the skin depth δ obtained by the above equation (2) is more compared to the case of FIG. Deepen. As a result, an alternating magnetic field and eddy current can penetrate into the inside of the rope 1 and the eddy current reaches the defect position. Therefore, by applying a DC magnetic field to keep the internal magnetic flux B of the rope 1 in a saturated state, it becomes possible to improve the breakage detection accuracy of the rope 1 based on the measurement result of the leakage flux of the eddy current magnetic field.

From the above description, the technical features of the present invention are summarized as follows.
(Characteristic 1) By applying a DC magnetic field to the rope 1, variations in the magnetic properties of the rope 1 can be suppressed, and the cross-sectional area can be measured with high accuracy.
(Characteristic 2) By applying a DC magnetic field to the rope 1, the permeability μ of the rope 1 can be lowered. As a result, the AC magnetic field can easily enter the inside of the rope, and the breakage detection accuracy of the rope 1 can be improved. Is possible.

As described above, according to the first embodiment, when detecting an abnormal shape of the rope, a DC magnetic field is applied to the rope to saturate the internal magnetic flux of the rope. Then, by applying an alternating magnetic field to the saturated rope, rope breakage detection and cross-sectional area measurement are performed. As a result, it is possible to realize an improvement in the accuracy of breakage detection and cross-sectional area measurement while suppressing the influence due to the difference in magnetic characteristics for ropes having different magnetic characteristics.

Embodiment 2. FIG.
In the second embodiment, a rope damage diagnostic inspection apparatus that realizes the above-described features 1 and 2 with a configuration different from that of the first embodiment will be described.

FIG. 7 is a configuration diagram of a rope damage diagnostic inspection apparatus according to Embodiment 2 of the present invention. The rope damage diagnosis and inspection apparatus according to the second embodiment includes a first yoke 10, a second yoke 20, an axial coil 30, a circumferential coil 41, alternating

current sources

50 and 51, and

voltage measuring devices

60 and 61. It is configured. In FIG. 7, the controller 70 is not shown.

As a structural difference from the first embodiment, the rope damage diagnosis and inspection apparatus according to the second embodiment includes a circumferential coil 41 instead of the magnetic sensor array 40, and an alternating current source 51 and a voltage measuring device. 61 is newly provided. In the second embodiment, the cross-sectional area measurement is the same as in the previous embodiment, but the break detection is performed using the circumferential coil 41 arranged in the vicinity of the rope 1. Hereinafter, it explains in detail using a drawing.

In the first embodiment, the controller 70 applies the alternating magnetic field generated by the alternating current source 50, the axial coil 30, and the second yoke 20 to the rope 1, and measures the leakage magnetic flux by the magnetic sensor array 40. By doing so, the breakage was detected.

In contrast, in the second embodiment, the controller 70 applies an alternating magnetic field generated by the alternating current source 51 and the circumferential coil 41 to the rope 1 and measures the leakage magnetic flux by the circumferential coil 41. By doing so, rupture detection is performed.

<About the principle of fracture detection in Embodiment 2>
FIG. 8 is a diagram for explaining the principle of disconnection detection in the second embodiment of the present invention. Specifically, the circumferential coil 41 generates an alternating magnetic field 2 and changes the eddy current magnetic field. It is explanatory drawing which showed the state detected.

In the second embodiment, the controller 70 generates the AC magnetic field 2 by the AC current source 51 and the circumferential coil 41 and applies it to the rope 1 when performing break detection, and when measuring the cross-sectional area. As in the first embodiment, an AC magnetic field 1 is generated by the AC current source 50, the axial coil 30, and the second yoke 20 and applied to the rope 1.

Therefore, in the second embodiment, when the AC magnetic field 2 is being applied by the circumferential coil 41 in order to perform the fracture detection operation, the axial coil 30 is not operated and a current is passed through the axial coil 30. It is controlled by the controller 70 so as not to exist. On the contrary, when the AC magnetic field 1 is being applied by the axial coil 30 in order to measure the cross-sectional area, the controller 70 does not operate the circumferential coil so that no current flows through the circumferential coil 41. Be controlled.

When performing the disconnection detection in the second embodiment, the controller 70 causes an eddy current to flow in the axial direction by applying an alternating magnetic field 2 in the circumferential direction as shown in FIG. And the controller 70 detects the change of the eddy current magnetic field in a fracture | rupture location (A part) by reading the voltage V2 of the circumferential coil 41 with the voltage measuring device 61. FIG.

FIG. 9 is a flowchart showing a series of processing for fracture detection and cross-sectional area measurement according to Embodiment 2 of the present invention. The series of processes in FIG. 9 is executed by the controller 70 included in the rope damage diagnostic inspection apparatus. Moreover, in FIG. 9, although it performs in order of a fracture | rupture detection-> cross-sectional area measurement, there is no problem even if the order is reverse. Further, the operation of FIG. 9 is based on the premise that the internal magnetic flux of the rope 1 is saturated by application of a DC magnetic field or a pulse magnetic field.

First, in step S <b> 901, the controller 70 applies an alternating current magnetic field 2 to the rope 1 by supplying a constant alternating current to the circumferential coil 41 from the alternating current source 51.

Next, in step S <b> 902, the controller 70 detects the voltage V <b> 2 of the circumferential coil 41 via the voltage measuring device 61, thereby executing break detection. Specifically, the controller 70 determines that a break has occurred when the voltage V2 exceeds a voltage level corresponding to the allowable change amount of the eddy current magnetic field.

Next, in step S903, the controller 70 stops supplying an AC constant current from the AC current source 51 to the circumferential coil 41, ends the break detection process, and performs a cross-sectional area measurement process after step S911. Migrate to

In step S911, the controller 70 supplies the AC magnetic field 1 to the rope 1 by supplying an AC constant current from the AC current source 50 to the axial coil 30.

Next, in step S912, the controller 70 detects the voltage V1 of the axial coil 30 through the voltage measuring device 60, thereby executing cross-sectional area measurement. Specifically, the controller 70 measures the cross-sectional area based on the mathematical formula (1) described above.

Next, in step S913, the controller 70 stops supplying the constant AC current from the AC current source 50 to the axial coil 30, ends the cross-sectional area measurement process, and performs the break process after step S901. Return.

Since defects due to the breakage of the rope 1 occur in the circumferential direction, it becomes easy to disturb the eddy current in the axial direction. As a result, according to the break detection process according to the second embodiment using the circumferential coil 41, the eddy current due to the break is higher than in the first embodiment in which the break process is performed using the magnetic sensor array 40. Therefore, the output of the voltage V2 becomes larger. As a result, the breakage detection accuracy can be further improved.

As described above, according to the second embodiment, when an abnormal shape of the rope is detected, a DC magnetic field is applied to the rope so that the internal magnetic flux of the rope is saturated. Then, by applying an alternating magnetic field to the saturated rope, rope breakage detection and cross-sectional area measurement are performed. As a result, it is possible to realize an improvement in the accuracy of breakage detection and cross-sectional area measurement while suppressing the influence due to the difference in magnetic characteristics for ropes having different magnetic characteristics. Furthermore, a circumferential coil is used when detecting breakage. As a result, it becomes possible to further improve the detection accuracy of breakage as compared with the first embodiment.

Embodiment 3 FIG.
In the third embodiment, a rope damage diagnostic inspection apparatus that realizes the above-described feature 1 and feature 2 with a configuration different from that of the first and second embodiments will be described.

FIG. 10 is a configuration diagram of a rope damage diagnostic inspection apparatus according to Embodiment 3 of the present invention. The rope damage diagnosis and inspection apparatus according to the third embodiment includes a first yoke 10, an axial coil 31, a magnetic sensor array 40, an AC current source 50, and a voltage measuring device 60.

As a structural difference from the first embodiment, the rope damage diagnosis and inspection apparatus according to the third embodiment is arranged around the rope 1 instead of the axial coil 30 wound around the second yoke 20. An axial coil 31 is provided.

The specific principle and method regarding break detection and cross-sectional area measurement are the same as those in the first embodiment, and a description thereof will be omitted.

In the third embodiment, the second yoke 20 is not required by adopting a configuration in which the axial coil 31 is disposed around the rope 1. As a result, the absorption of the DC magnetic field by the yoke can be eliminated, and variations in the magnetic permeability μ can be suppressed.

FIG. 11 is a perspective view of the axial coil 31 according to the third embodiment of the present invention. As shown on the right side of FIG. 10 together with FIG. 11, the axial coil 31 can be easily attached to and detached from the rope 1 by adopting a two-part configuration.

As described above, according to the third embodiment, the configuration is such that the axial coil is arranged around the rope and the second yoke for applying the alternating magnetic field is not required. As a result, the absorption of the DC magnetic field by the yoke can be eliminated, the influence of the variation of the magnetic permeability μ can be suppressed, and further improvement in the accuracy of fracture detection and cross-sectional area measurement can be realized.

Claims

A rope damage diagnostic inspection device for inspecting the shape abnormality of a rope for hanging an elevator car,
A first yoke attached to the rope and applying a magnetic field to the rope to bring the rope into a magnetic saturation state;
A first alternating current source that outputs a constant alternating current;
An axial coil is configured, and a constant current is supplied from the first alternating current source to the axial coil, so that an alternating magnetic field is applied to the axial direction of the rope, An alternating magnetic field applicator for generating eddy currents and eddy current magnetic fields;
A leakage flux measuring instrument for measuring the leakage flux of the rope during application of the alternating magnetic field;
A first voltage measuring device for measuring a voltage of the axial coil during application of the alternating magnetic field;
The AC magnetic field is applied to the rope that is in the magnetic saturation state by the first yoke by controlling the AC magnetic field applicator, and the magnitude of the leakage magnetic flux measured by the leakage magnetic flux measuring instrument. Then, the presence or absence of breakage of the rope is detected, and the cross-sectional area of the rope is calculated as a value proportional to the voltage from the voltage measured by the first voltage measuring device. A rope damage diagnosis and inspection device comprising: a controller that inspects the rope shape abnormality from the area.
The AC magnetic field applicator is configured as a second yoke around which the axial coil is wound, and a constant current is supplied from the first AC current source to the axial coil based on control by the controller. The rope damage diagnosis and inspection apparatus according to claim 1, wherein the AC magnetic field is applied to the rope via the second yoke attached to the rope.
The AC magnetic field applicator is configured to be mounted so as to wind the axial coil around the rope, and from the first AC current source to the axial coil based on control by the controller. The rope damage diagnostic inspection apparatus according to claim 1, wherein the AC magnetic field is applied to the rope by supplying a constant current.
The rope damage diagnostic inspection apparatus according to claim 3, wherein the axial coil is configured by a coil divided into two.
The leakage magnetic flux measuring device is configured by a magnetic sensor array, and is arranged to measure the leakage magnetic flux in any one of a radial direction, an axial direction, and a circumferential direction of the rope. The rope damage diagnostic inspection apparatus according to claim 1.
The leakage flux measuring instrument is composed of a circumferential coil,
A second alternating current source for outputting an alternating constant current to the circumferential coil;
A second voltage measuring device that measures the voltage of the circumferential coil; and
The AC magnetic field applicator is:
A second yoke around which the axial coil is wound, and when measuring the cross-sectional area, a constant current is supplied from the first alternating current source to the axial coil based on control by the controller A first AC magnetic field applicator that applies a first AC magnetic field as the AC magnetic field to the rope via the second yoke attached to the rope;
When determining the presence or absence of the breakage, a second current is supplied as the AC magnetic field to the rope by supplying a constant current from the second AC current source to the circumferential coil based on the control by the controller. A second AC magnetic field applicator for applying an AC magnetic field,
The controller is
When measuring the cross-sectional area, the first AC magnetic field is applied to the rope that has been saturated with the first yoke by controlling the first AC magnetic field applicator, From the voltage measured by the first voltage measuring device, calculate the cross-sectional area of the rope as a value proportional to the voltage,
When determining the presence or absence of the break, the second AC magnetic field is applied to the rope that has been saturated with the first yoke by controlling the second AC magnetic field applicator. The rope damage diagnosis and inspection device according to claim 1, wherein presence or absence of breakage of the rope is detected from a voltage measured by the second voltage measuring device.
The rope damage diagnostic inspection apparatus according to any one of claims 1 to 6, wherein the first yoke has a permanent magnet and applies a DC magnetic field to the rope.
The rope damage diagnostic inspection apparatus according to any one of claims 1 to 6, wherein the first yoke includes an electromagnet and applies a pulse magnetic field to the rope.
A rope damage diagnostic inspection method for inspecting an abnormal shape of a rope for hanging an elevator car,
Applying a magnetic field to the rope to bring the rope into a magnetic saturation state;
A second step of applying an alternating magnetic field to the rope in the magnetic saturation state;
A third step of measuring leakage flux of the rope during application of the alternating magnetic field;
A fourth step of detecting presence or absence of breakage of the rope from the measured magnitude of the leakage magnetic flux;
A fifth step of measuring a voltage that fluctuates due to an eddy current magnetic field generated in the axial direction of the rope during application of the alternating magnetic field;
A sixth step of calculating a cross-sectional area of the rope as a value proportional to the measured voltage;
A rope damage diagnosis and inspection method comprising: a seventh step of determining an abnormality in the shape of the rope from the detection result of the presence or absence of the fracture in the fourth step and the calculation result of the cross-sectional area in the step 6.