KR20210105167A - Chanin diagnostic apparatus and method - Google Patents

Abstract

The present invention relates to a chain diagnostic apparatus and a chain diagnostic method, and the chain diagnostic apparatus according to an embodiment of the present invention includes a housing having a tunnel having a cross section corresponding to the cross section of a chain so that the chain can pass therethrough, a magnetization unit positioned adjacent to the tunnel and magnetizing the chain passing through the tunnel, a sensing unit positioned adjacent to the tunnel and sensing a magnetic signal from the magnetized chain, and a diagnostic unit analyzing the magnetic signal to diagnose the state of the chain. The chain diagnostic apparatus and method of the present invention can detect defects of a chain without being affected by surrounding noises by using magnetic signals.

Description

CHAIN DIAGNOSTIC DEVICE AND METHOD {CHANIN DIAGNOSTIC APPARATUS AND METHOD}

The present invention relates to an apparatus and method for diagnosing chain damage. More particularly, the present invention relates to an apparatus and method for diagnosing damage to a chain by analyzing a magnetic signal from the chain.

An escalator is a device for transporting passengers by using a plurality of steps that are installed obliquely between floors and move in an inclined direction. Since the step on which the occupant climbs is connected to the rotating driving chain by the driving unit and moves, an accident in which the occupant is overturned occurs frequently when the chain is broken.

To prevent such a problem, it is mandatory to install an auxiliary brake, but since this is done after the chain has already been broken, even if the auxiliary brake is activated, reverse push occurs, and as a result, an accident in which the occupant is overturned still occurs.

Therefore, it is obligatory to periodically check whether there is any problem in the chain of the escalator, but currently, it is completely dependent on the visual inspection, and the diagnosis accuracy is low because it is dependent on the subjectivity of the inspector.

In particular, since the actual drive chain is coated with oil, grease, etc., it is difficult to diagnose the problem even if a problem such as local damage occurs before it is completely broken.

In addition, in the current diagnosis method, there is a risk that an expert must directly access the chain drive unit to diagnose the chain, and there is a problem that the operation of the escalator must be stopped for inspection.

Japanese Patent Laid-Open No. 2007-230667 "Escalator Abnormality Diagnosis Device"

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and method for diagnosing a chain capable of detecting a precursor phenomenon of chain breakage, such as cracks and wear of the chain.

Another object of the present invention is to provide a chain diagnosis apparatus and method capable of detecting whether a chain is damaged without being affected by ambient noise by using a magnetic signal.

Another object of the present invention is to provide a chain diagnosis apparatus and method capable of diagnosing the state of a chain while the escalator is operating by detecting chain damage using a magnetic signal.

Another object of the present invention is to provide a chain diagnosis apparatus and method for processing a measured magnetic signal so that chain damage can be easily detected.

Another object of the present invention is to provide a chain diagnosis apparatus and method capable of reducing maintenance costs by rational replacement of chain parts according to accurate condition evaluation.

The above and other objects of the present invention can all be achieved by the chain diagnosis apparatus and method according to the present invention.

A chain diagnosis apparatus according to an embodiment of the present invention includes: a housing having a tunnel having a cross section corresponding to the cross section of the chain so that the chain can pass therethrough; a magnetizer positioned adjacent to the tunnel to magnetize a chain passing through the tunnel; a sensing unit positioned adjacent to the tunnel to sense a magnetic signal from the magnetized chain; and a diagnostic unit for diagnosing the state of the chain by analyzing the magnetic signal.

The housing may include an upper housing and a lower housing that can be separated and combined, wherein a first concave portion constituting an upper region of the tunnel is formed in the upper housing, and a second concave portion constituting a lower region of the tunnel is formed in the lower housing. A concave portion is formed, and the first concave portion and the second concave portion are coupled to face each other to form the tunnel.

In addition, the magnetization part may include an upper magnetization part positioned in the upper housing and a lower magnetization part positioned in the lower housing, and the upper magnetization part and the lower magnetization part are a steel plate, an N pole protruding from one end of the steel plate toward the tunnel. The magnet and the S-pole magnet protruding from the other end of the steel plate toward the tunnel may be formed, respectively.

In addition, the sensing unit may include an upper sensor located in the upper housing and a lower sensor located in the lower housing, wherein the upper sensor is located between the N-pole magnet and the S-pole magnet of the upper magnetization unit, and the lower The sensor may be located between the N-pole magnet and the S-pole magnet of the lower magnetization part.

The upper magnetization part and the lower magnetization part may each have a U-shape.

The upper sensor and the lower sensor may include a plurality of Hall sensors, and the plurality of Hall sensors may be arranged in a direction crossing the movement direction of the chain.

The upper magnetization part and the lower magnetization part may be positioned so that the same pole magnet faces each other.

The upper sensor and the lower sensor may include the number of Hall sensors corresponding to the chain plate of the chain, and the plurality of Hall sensors may be spaced apart from each other by the same distance as the distance between the chain plates.

It is preferable that a guide block extending along a movement direction of the chain is formed in the first concave portion or the second concave portion, and the position and cross section of the guide block correspond to the concave portion in the chain cross section.

The inlet and outlet of the tunnel may form an inclination as the cross section of the tunnel is gradually widened toward the end.

A chain diagnosis method according to an embodiment of the present invention is a chain diagnosis method performed by a chain diagnosis apparatus, comprising: a chain magnetizing step of magnetizing a part of a chain moving in a partial region in a movement path of the chain; a sensing step of detecting a detected magnetic signal from the magnetized chain; and a diagnosis step of determining that damage has occurred in the chain region in which the magnetic signal is detected when the magnetic signal exceeds a predetermined normal range.

The magnetic signal is a magnetic flux signal, the peak value of the magnetic flux signal is extracted in the diagnosis step, the average value of the extracted peak values is removed from the extracted peak value, and then the difference value of the peak is calculated, and the difference value is within the normal range Whether or not it is exceeded can determine whether the chain is damaged.

Also, in the diagnosis step, it is possible to obtain an envelope based on the Hilbert transform from the difference value of the peak, and determine whether the chain is damaged by whether or not there is a portion exceeding the normal range in the envelope.

By using the magnetic signal of the present invention, it is effective to provide a chain diagnosis apparatus and method capable of detecting a precursor of chain breakage, such as cracks and wear of the chain, without being affected by ambient noise.

In addition, the present invention can diagnose the state of the chain while the escalator is running by detecting the chain damage using the magnetic signal, and accurately determine whether the chain is damaged by processing the measured magnetic signal to easily detect the chain damage. It has the effect of reducing maintenance costs by rational replacement of chain parts.

1 is a view showing a chain diagnosis apparatus according to an embodiment of the present invention.
2 is a view showing an upper housing of a chain diagnosis apparatus according to an embodiment of the present invention.
3 is a view showing a lower housing of a chain diagnosis apparatus according to an embodiment of the present invention.
4 is a view showing a state in which the chain diagnosis apparatus according to an embodiment of the present invention is installed on a chain.
5 is a view showing a guide block and an inclined portion formed in a housing of a chain diagnosis apparatus according to an exemplary embodiment of the present invention.
6 is a photograph showing an exemplary double chain.
7 is a photograph showing a magnetization unit of a chain diagnosis apparatus according to an exemplary embodiment of the present invention.
8 is a view showing an upper surface and a lower surface of the sensor holder, respectively.
9 is a view showing a sensor unit receiving groove and a magnetizing unit receiving groove formed in the housing.
10 is a view showing a state in which the sensor holder is accommodated in the sensor unit receiving groove of the housing.
11 is a view showing a state in which the magnetization unit is accommodated in the magnetization unit receiving groove of the housing.
12 is a view showing a state in which a cover is installed on the upper housing or the lower housing.
13 is a view showing a state in which the assembly of the chain diagnosis apparatus according to an exemplary embodiment of the present invention is completed by combining the upper housing and the lower housing.
14 is a cross-sectional view taken along line AA′ of FIG. 13 .
15 is an exemplary graph of a magnetic flux signal in which a damaged portion is detected.
16 is a graph in which only the peak values are extracted from the graph of FIG. 15 and the average value of all peak values is removed therefrom.
17 is a graph in which a difference value of a peak signal is calculated in the graph of FIG. 16 .
18 is a graph illustrating an envelope based on a Filbert transform derived from the graph of FIG. 17 .
19 is a graph showing the determination of damage using a preset threshold value in the graph of FIG. 18 .
20 is a photograph showing a locally damaged chain.
21 is a photograph showing a state in which the damaged chain of FIG. 20 is installed in the chain diagnosis apparatus according to an embodiment of the present invention.
22 is a graph showing a magnetic flux signal detected by a chain diagnosis apparatus according to an embodiment of the present invention in a normal chain.
23 is a graph showing a magnetic flux signal detected by a chain diagnosis apparatus according to an embodiment of the present invention in a damaged chain.
24 is a graph showing only the magnetic flux signal sensed by the No. 1 Hall sensor Ch.1 in FIGS. 22 and 23 .
25 is a graph in which only the peak values are extracted from the graph of FIG. 24 and the average value of all peak values is removed therefrom.
FIG. 26 is a graph in which a difference value of a peak signal is calculated in the graph of FIG. 25 .
27 is a graph illustrating an envelope based on a Filbert transform derived from the graph of FIG. 26 .
28 is a graph illustrating an envelope based on a Filbert transformation derived from a magnetic flux signal sensed by the No. 5 Hall sensor (Ch.5).

Hereinafter, a chain diagnosis apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, only the parts necessary for understanding the chain diagnosis apparatus and method according to the embodiment of the present invention will be described, and descriptions of other parts may be omitted so as not to obscure the gist of the present invention.

In addition, the terms or words used in the present specification and claims described below should not be construed as being limited to conventional or dictionary meanings, and meanings consistent with the technical spirit of the present invention so that the present invention can be most appropriately expressed. and should be interpreted as a concept.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated. In addition, terms such as “…unit”, “…group”, and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

In various embodiments, components having the same configuration will be typically described in one embodiment using the same reference numerals, and configurations different from the one embodiment will be described in other embodiments.

1 shows a chain diagnosis apparatus 100 according to an embodiment of the present invention.

The chain diagnosis apparatus 100 according to an embodiment of the present invention includes a housing 10 , a magnetization unit 20 , and a sensing unit 30 .

The housing 10 of the chain diagnosis apparatus 100 according to an embodiment of the present invention includes a tunnel 11 as shown in FIG. 1 . The tunnel 11 is formed to penetrate from one side to the other side of the housing 10 so that the chain can pass through the housing through the tunnel. Inspect the chain and diagnose whether the chain is abnormal.

At this time, the cross section of the tunnel may be formed equal to or larger than the cross section of the chain passing through the housing. do.

In addition, it is preferable that the inlet and outlet of the tunnel are designed such that the cross section of the tunnel is gradually widened toward the end to form a slope so that the chain passes through the chain diagnosis apparatus 100 according to the embodiment of the present invention without impact.

In addition, as shown in FIGS. 2 and 3 , the housing 10 of the chain diagnosis apparatus 100 according to an embodiment of the present invention includes an upper housing 12 and a lower housing 13 that can be separated and combined. desirable.

More specifically, a first concave portion 11-1 constituting an upper region of the tunnel is formed in the upper housing 12, and a second concave portion 11-2 constituting a lower region of the tunnel is formed in the lower housing 13. is formed, and the first concave portion and the second concave portion are combined to form one tunnel 11 .

Therefore, as shown in FIG. 4, a chain is placed in the second concave portion 11-2 of the lower housing 13, covered with the upper housing 12, and then the upper housing and the lower housing are combined. The chain diagnosis apparatus 100 according to an embodiment of the present invention can be easily installed even on a chain that is already used in the present invention.

Also, as shown in FIG. 5 , a guide block B may be formed in the second concave portion 11 - 2 of the lower housing 13 . Also, a guide block may be formed in the first concave portion 11-1 of the upper housing.

The guide block (B) is formed to extend along the movement direction of the chain (C) passing through the tunnel, and the position and cross section of the guide block are designed to correspond to the concave portion in the cross section of the chain passing through the tunnel.

Therefore, when designing the chain diagnosis device 100 for diagnosing a double chain as shown in FIG. 6, two guide blocks are formed, and the width (D) of each guide block is the distance (d) between the chain plate and the chain plate. ) and the height (H) of the block is preferably designed to correspond to the step (h) between the chain plate and the roller.

This guide block allows the chain to pass through the tunnel 11 along a defined position with minimal lift-off.

Next, the magnetizer 20 of the chain diagnosis apparatus 100 according to an embodiment of the present invention is provided to magnetize the chain penetrating the housing.

The magnetizing unit 20 is preferably located adjacent to the tunnel in order to magnetize the chain passing through the tunnel. In particular, the upper magnetizing unit 20-1 and the lower housing located in the upper housing rather than located only on one side of the housing. It is preferable to include the lower magnetization part 20-2 located in the .

As shown in FIG. 7, each of the upper magnetization part and the lower magnetization part consists of a steel plate 21, an N-pole magnet 22 protruding from one end of the steel plate, and an S-pole magnet 23 protruding from the other end of the steel plate. It is made in a U-shape or more preferably a U-shape to form a magnetic field closed loop connecting the steel plate, the N-pole magnet, and the S-pole magnet.

Next, the sensing unit 30 of the chain diagnosis apparatus 100 according to an embodiment of the present invention is provided to sense a magnetic signal from the magnetized chain.

The sensing unit 30 is preferably located adjacent to the tunnel in order to sense a magnetic signal from a chain passing through the tunnel, and like the magnetization unit, the sensing unit 30 is also located in the upper housing of the upper sensing unit 30-1. ) and the lower sensing unit 30-2 located in the how housing is preferably formed.

In particular, since the sensing unit 30 is preferably positioned between the N-pole magnet and the S-pole magnet of the magnetization unit to sense a magnetic signal from the magnetized chain, the upper sensing unit 30-1 is connected to the upper magnetized unit 20-1. ) is located between the N pole magnet and the S pole magnet, and the lower sensing unit 30-2 is preferably located between the N pole magnet and the S pole magnet of the lower magnetization unit 20-2.

Also, the sensing unit 30 may include a plurality of Hall sensors 31 . At this time, in order to easily install a plurality of Hall sensors at once, the sensor holder 32 as shown in FIG. 8 may be used. That is, a plurality of Hall sensors can be easily positioned in the housing by placing the Hall sensor in the sensor holder and then installing the sensor holder in the housing.

At this time, an arbitrary number of Hall sensors may be arranged in the sensor holder 32 at regular intervals, but since the part where damage occurs mainly in the chain is the chain plate, it is recommended that the plurality of Hall sensors be arranged at the number and spacing corresponding to the chain plate. desirable.

That is, since four chain plates are used in the width direction in the double chain as shown in FIG. 6 (or chain plates are located in four areas in the width direction), the four hall sensors 31 are installed in the sensor holder 32 . It is desirable to design the sensor holder to be installed at intervals corresponding to the chain plate.

In addition, by configuring the upper sensing unit 30-1 and the lower sensing unit 30-2 to include these sensor holders, respectively, magnetic signals from the four chain plates of the double chain are transmitted by the four Hall sensors of the upper sensing unit and the lower sensing unit. It is preferable to combine 4 Hall sensors to configure a total of 8 Hall sensors to sense.

In addition, it is preferable that the plurality of Hall sensors be arranged in a direction crossing the movement direction of the chain so that all chain plates can be inspected.

In order to install the magnetization unit 20 and the sensing unit 30 described so far in the housing, as shown in FIG. 9 , the housing 10 has sensing unit accommodating grooves 12-1 and 13-1 and magnetizing unit accommodating grooves. (12-2, 13-2) is preferably formed. Specifically, the upper housing 12 has an upper sensing unit receiving groove 12-1 and an upper magnetizing unit receiving groove 12-2, and the lower housing includes lower sensing unit receiving grooves 12-1 and 13-2 and The lower magnetization unit receiving grooves 13-2 are respectively formed.

The sensing unit receiving grooves 12-1 and 13-1 are formed in a direction intersecting with the moving direction of the chain C (that is, the extension direction of the tunnel), preferably in a direction orthogonal, as shown in FIG. and has a width corresponding to the sensor holder, and as shown in FIG. 10, a plurality of hall sensors 31 are placed in a predetermined position by inserting the sensor holder 32 into the sensing unit receiving grooves 12-1 and 13-1. can be easily installed on

In addition, as shown in FIG. 9 , the magnetization unit receiving grooves 12-2 and 13-2 have a groove located on one side of the sensing unit receiving grooves 12-1 and 13-1 and a groove located on the other side of the sensing unit receiving groove. As shown in FIG. 11 in a method of inserting the N pole magnet 22 and the S pole magnet 23 of the magnetization unit 20 into the respective grooves, the magnetization unit 20 is attached to the housing 10. can be positioned. At this time, the magnets of the upper magnetization unit and the lower magnetization unit are preferably accommodated in the magnetization unit receiving groove so that the same pole magnets of the upper magnetization unit and the lower magnetization unit face each other when the upper housing and the lower housing face each other.

In this way, the upper sensing unit and the upper magnetizing unit are positioned in the upper housing 12 , and the lower sensing unit and the lower magnetizing unit are positioned in the lower housing 13 , and then the outer and lower housings of the upper housing as shown in FIG. 12 . The first concave portion of the upper housing 12 and the lower housing ( The assembly of the chain diagnosis apparatus 100 according to an embodiment of the present invention may be completed by combining the upper housing and the lower housing so that the second concave portions of 13) face each other.

As shown in FIG. 14 , a magnetic field closed loop is formed in the upper region of the tunnel by the upper magnetization unit 21 and the lower magnetization is formed inside the tunnel of the chain diagnosis apparatus 100 according to the embodiment of the present invention assembled as described above. A magnetic field closed loop is formed in the lower region of the tunnel by the unit 22 to magnetize the entire chain C passing through the tunnel, and the sensing unit 30 can sense the resulting magnetic signal.

The chain diagnosis apparatus 100 according to an embodiment of the present invention may further include a diagnosis unit (not shown) for diagnosing the state of the chain C by analyzing the magnetic signal sensed by the sensing unit 30 . .

The magnetic signal sensed by the sensing unit 30 may be provided to the diagnosis unit through wired/wireless communication. At this time, when the diagnostic unit is accommodated in the housing 10 like the magnetization unit 20 and the sensing unit 30, it is preferable that the diagnosis unit and the sensing unit are connected by wire, so that the magnetic signal sensed by the sensing unit is transmitted to the diagnosis unit. When the additional housing is accommodated outside the housing, the diagnostic unit and the sensing unit may be connected by wire or wirelessly, and the magnetic signal detected by the sensing unit may be transmitted to the diagnosis unit.

After receiving the magnetic signal from the sensing unit, the diagnosis unit may analyze the received magnetic signal to diagnose the state of the chain, and then provide a diagnosis result to the user.

Hereinafter, a chain diagnosis method by the diagnosis unit will be described in more detail.

First, the magnetic signal sensed by the sensing unit 30 may be, for example, a magnetic flux signal. The magnetic flux signal has a sinusoidal shape with two peaks per one chain plate as shown in FIG. 15 . At this time, if the plate is damaged, since the peak value of the magnetic flux signal changes, the sensing unit 30 may determine whether the peak value of the magnetic flux signal changes to diagnose whether there is a problem in the chain. Specifically, when the peak value of the magnetic flux signal exceeds a predetermined normal range, it may be determined that damage has occurred in the chain region corresponding to the corresponding magnetic flux signal.

However, as shown in FIG. 15 , since the amount of change in the peak is not large compared to the overall magnitude of the magnetic flux signal, it is not easy to determine whether the peak value of the magnetic flux signal exceeds a predetermined normal range.

At this time, when only the peak value is extracted from the magnetic flux signal as shown in FIG. 15 and the average value of all peak values is removed therefrom, the signal of the damaged part is differentiated from the signal of the normal area, as shown in FIG. The site can be found more easily.

In addition, since a change in the peak occurs instantaneously, if the difference value of the peak signal is calculated to use it, a graph as shown in FIG. 17 can be obtained. can be found more easily.

In addition, if an envelope based on the Hilbert transform is obtained so that damage can be judged with one positive reference value, it appears as shown in FIG. 18, so a certain threshold (eg 1) that can be defined as a normal signal range is set and the By defining a peak value exceeding the threshold as damage as shown in 19, damage to the chain can be easily detected.

In order to verify the effectiveness of the chain diagnosis apparatus and chain diagnosis method according to an embodiment of the present invention, a normal chain without damage and a chain with a locally damaged side of the plate as shown in FIG. 20 were prepared. The magnetic flux signal was sensed by a chain diagnostic device according to At this time, as shown in FIG. 21, the numbers of the four Hall sensors of the upper sensing part and the four Hall sensors of the lower sensing part are numbered 1 to 8, and the damaged plate is positioned close to the Hall sensor 1 and Hall 5 did.

At this time, the magnetic flux signal of the normal chain sensed by Hall sensors No. 1 to No. 8 was as shown in FIG. 22, and the magnetic flux signal of the damaged chain sensed by Hall sensors No. 1 to No. 8 was as shown in FIG. 23.

For comparison, referring to FIG. 24 showing the magnetic flux signal of the normal chain and the magnetic flux signal of the damaged chain sensed by Hall sensor No. 1, it can be seen that a change in the peak value has occurred in the magnetic flux signal of the damaged chain, but the difference is It is so insignificant that it is difficult to easily detect damage to the chain.

Therefore, as shown in FIG. 25, when only the peak value is extracted from the magnetic flux signal and the average value of the entire peak value is removed from this, or when the difference value of the peak signal is calculated in FIG. It was confirmed that it could be found more easily.

In addition, as shown in FIG. 27 , it was confirmed that the damaged area could be more easily detected through comparison with a preset threshold (eg, 1) when the envelope based on the Hilbert transform was obtained.

In addition, as shown in FIG. 28 , it was confirmed that the damaged part could be effectively detected even from the magnetic signal sensed by the No. 5 Hall sensor.

So far, the chain diagnosis apparatus and method according to the embodiment of the present invention have been described with reference to specific embodiments. However, it should be understood that the present invention is not limited to these specific embodiments, and various changes and modifications may be made without departing from the spirit and scope of the invention as claimed in the claims.

10: housing 11: tunnel
11-1: 1st recessed part 11-2: 2nd recessed part
12: upper housing 12-1: sensing unit receiving groove
12-2: magnetization unit receiving groove 13: lower housing
13-1: sensing unit storage groove 13-2: magnetization unit storage groove
20: magnetization unit 20-1: upper magnetization unit
20-2: lower magnetization part 21: steel plate
22: N pole magnet 23: S pole magnet
30: sensing unit 30-1: upper sensing unit
30-2: lower sensing unit 31: hall sensor
32: sensor holder 40: cover
100: chain diagnostic device B: guide block
C: chain

Claims (12)

a housing having a tunnel having a cross section corresponding to the cross section of the chain so that the chain can pass therethrough;
a magnetizer positioned adjacent to the tunnel to magnetize a chain passing through the tunnel;
a sensing unit positioned adjacent to the tunnel to sense a magnetic signal from the magnetized chain; and
a diagnostic unit for diagnosing the state of the chain by analyzing the magnetic signal;
Chain diagnostic device comprising a. According to claim 1,
The housing includes an upper housing and a lower housing that can be separated and coupled, a first concave portion forming an upper region of the tunnel is formed in the upper housing, and a second concave portion forming a lower region of the tunnel in the lower housing a portion is formed, and the first concave portion and the second concave portion are coupled to face each other to form the tunnel. 3. The method of claim 2,
The magnetization part includes an upper magnetization part positioned in the upper housing and a lower magnetization part positioned in the lower housing, and the upper magnetization part and the lower magnetization part include a steel plate, an N-pole magnet protruding from one end of the steel plate toward the tunnel, and a steel plate. Each of the S-pole magnets protruding from the other end of the tunnel toward the tunnel,
The sensing unit comprises an upper sensor located in the upper housing and a lower sensor located in the lower housing, the upper sensor is located between the N-pole magnet and the S-pole magnet of the upper magnetization unit, and the lower sensor is Chain diagnosis device, characterized in that located between the N-pole magnet and the S-pole magnet of the lower magnetization part. 4. The method of claim 3,
The diagnostic apparatus according to claim 1, wherein the upper magnetization part and the lower magnetization part each have a U-shape. 4. The method of claim 3,
The upper sensor and the lower sensor are made of a plurality of Hall sensors, and the plurality of Hall sensors are arranged in a direction crossing the movement direction of the chain. 4. The method of claim 3,
The chain diagnosis device, characterized in that the upper magnetization part and the lower magnetization part are positioned so that the same pole magnets face each other. 6. The method of claim 5,
The upper sensor and the lower sensor are made of a number of Hall sensors corresponding to the chain plate of the chain, and the plurality of Hall sensors are spaced apart from each other by the same spacing as the spacing of the chain plate. 3. The method of claim 2,
A guide block extending along a movement direction of the chain is formed in the first concave portion or the second concave portion, and the position and cross section of the guide block correspond to the concave portion in the chain cross section. diagnostic device. According to claim 1,
Chain diagnosis apparatus, characterized in that the inlet and outlet of the tunnel gradually widens the cross section toward the end to form a slope. A chain diagnostic method performed by a chain diagnostic device, comprising:
a chain magnetization step of magnetizing a part of the chain moving in a partial region in the movement path of the chain;
a sensing step of detecting a detected magnetic signal from the magnetized chain; and
a diagnosis step of determining that damage has occurred in a chain region in which the magnetic signal is detected when the magnetic signal exceeds a predetermined normal range;
Chain diagnosis method comprising a. 11. The method of claim 10,
The magnetic signal is a magnetic flux signal, the peak value of the magnetic flux signal is extracted in the diagnosis step, the average value of the extracted peak values is removed from the extracted peak value, and then the difference value of the peak is calculated, and the difference value is within the normal range A chain diagnosis method, characterized in that it is determined whether the chain is damaged by whether or not it is exceeded. 12. The method of claim 11,
In the diagnosis step, the Hilbert transform-based envelope is obtained from the difference value of the peak, and whether the chain is damaged is determined based on whether the envelope has a portion that exceeds a normal range.

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