JP2018100167A - Abnormality detector and abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector allowing even a low-skilled maintenance person to easily determine that a detected change in a magnetic flux is a change in a magnetic flux caused by leakage of the magnetic flux from its deteriorated portion.SOLUTION: An abnormality detector of an embodiment comprises a plurality of magnetizers that magnetize plurality of wire ropes to detect a change in a magnetic flux, a fixing member that integrally fixes each magnetizer, and an attaching member for attaching, to a part of an elevator, each magnetizer integrally fixed by the fixing member. Each magnetizer includes a pair of magnets disposed opposite to each other with a predetermined interval in a moving direction of the wire ropes, and a sensor that detects the change in the magnetic flux of the wire ropes magnetized by the pair of magnets, and has magnetic flux detection parts mutually arrayed with a predetermined interval in a width direction of the wire ropes. The pair of magnets are disposed such that different magnetic poles face each other and also disposed such that the magnetic poles are adjacent to the same magnetic poles from the pair of magnets included in the adjacent magnetic flux detection part.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an anomaly detector and an anomaly detection method that can detect an anomaly that has occurred in an elevator rope.

  Generally, in an elevator, for example, by driving a hoisting machine on which a main rope that connects a car and a counterweight is wound, the car and the counterweight are moved up and down in opposite directions.

  A wire rope is used as the main rope in such an elevator. The wire rope is a rope formed by twisting a plurality of strands formed by twisting thin steel wires called strands around the fiber core in the center.

  By the way, in such an elevator, maintenance management of the wire rope is obliged. In general, maintenance personnel visually observe the breakage and wear of the wire to grasp the residual strength, but since the wire is thin and observation work is not easy, breakage and wear occur. A magnetic flaw detector is used to search for a deteriorated portion more quickly and accurately.

  A magnetic flaw detector is generally a device that magnetizes a wire rope with a permanent magnet and detects a change in magnetic flux. The maintenance staff determines whether the change in the magnetic flux detected by the magnetic flaw detection apparatus is a change in the magnetic flux due to the leakage of the magnetic flux from the deteriorated portion, and identifies the deteriorated portion.

JP 2005-154042 A Japanese Patent No. 5094067 JP 2012-56717 A

  However, since the change in magnetic flux is caused not only by leakage of magnetic flux from the deteriorated part but also by movement (swaying) of the wire rope at the time of measurement, the maintenance personnel must observe the change in detected magnetic flux from the deteriorated part. It is necessary to accurately determine whether the magnetic flux changes due to magnetic flux leakage. This requires a certain level of skill.

  The problem to be solved by the present invention is that even a low-skilled maintenance person can easily determine that the detected change in magnetic flux is a change in magnetic flux due to leakage of magnetic flux from a deteriorated portion. An abnormality detector and an abnormality detection method are provided.

  The abnormality detector according to the embodiment includes a plurality of magnetizers that magnetize a plurality of wire ropes of an elevator to detect a change in magnetic flux, a fixing member that integrally fixes the magnetizers, and the fixing member. An attachment member for attaching the magnetizers fixed integrally to a part of the elevator, and the magnetizers are arranged to face each other at a predetermined interval in the moving direction of the wire rope. A magnetic flux detection unit that includes a pair of magnets and a sensor that detects a change in magnetic flux of the wire rope magnetized by the pair of magnets, and is arranged with a predetermined gap between each other in the width direction of the wire rope; And a sliding part that is attached to the surface of the magnetic flux detection part and guides the sliding of the wire rope, and the pair of magnets are arranged so that different magnetic poles face each other and are adjacent to each other. Same magnetic poles each other and a pair of magnets included in the magnetic flux detecting unit is arranged adjacent.

FIG. 1 is a diagram illustrating an installation position of the abnormality detector according to the first embodiment. FIG. 2 is a perspective view showing the structure of the abnormality detector according to the embodiment. FIG. 3 is a side view of the abnormality detector according to the embodiment. FIG. 4 is a top view of the abnormality detector according to the embodiment. FIG. 5 is a diagram for explaining a magnetizer constituting the abnormality detector according to the embodiment. FIG. 6 is a plan view of the abnormality detector according to the embodiment viewed from the wire rope side. FIG. 7 is a perspective view showing the structure of a conventional abnormality detector. FIG. 8 is a side view of a conventional abnormality detector. FIG. 9 is a top view of a conventional abnormality detector. FIG. 10 is a plan view of a conventional abnormality detector as viewed from the wire rope side. FIG. 11 is a diagram for explaining the magnetic flux density with respect to a conventional abnormality detector. FIG. 12 is a graph showing changes in magnetic flux detected by a conventional abnormality detector. FIG. 13 is a diagram for explaining the magnetic flux density with respect to the abnormality detector according to the embodiment. FIG. 14 is a graph showing a change in magnetic flux detected by the abnormality detector according to the embodiment. FIG. 15 is a perspective view of the abnormality detector according to the second embodiment viewed from the front side. FIG. 16 is a perspective view of the abnormality detector according to the embodiment viewed from the back side. FIG. 17 is a side view of the abnormality detector according to the embodiment. FIG. 18 is a top view of the abnormality detector according to the embodiment. FIG. 19 is a graph showing a change in magnetic flux detected by the abnormality detector according to the embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
[First Embodiment]
The elevator abnormality detector (hereinafter simply referred to as “abnormality detector”) according to the first embodiment is used, for example, during maintenance inspection of a main rope composed of a plurality of wire ropes. Each wire rope constituting the main rope is a rope formed by twisting a plurality of strands formed by twisting thin steel wires called strands around the fiber core at the center. .

  First, with reference to FIG. 1, the installation position of the abnormality detector according to the present embodiment will be briefly described.

  In the elevator, the elevator control device 11 is installed in a machine room (not shown), for example, and performs operation control of the entire elevator including drive control of the hoisting machine 12. The hoisting machine 12 is supported on the machine beam 13 and is provided together with the elevator control device 11 in the machine room. A main sheave (traction sheave) 14 is attached to the drive shaft of the hoisting machine 12, and a main rope 15 is wound around the outer periphery of the main sheave 14. One end of the main rope 15 is connected to the car 16 and the other end is connected to a counterweight (C / W) 17.

  In FIG. 1, the main rope 15 is shown as a single rope for convenience, but the main rope 15 is composed of a plurality of wire ropes as described above.

  When the hoisting machine 12 is driven based on the control of the elevator controller 11, the main sheave 14 around which the main rope 15 is wound rotates, and the car 16 and the counterweight connected to the main rope 15. 17 moves up and down like a vine.

  A compen- sion rope 18 is connected to the bottoms of the car 16 and the counterweight 17 via a compensator 19. The compensation rope 18 is a rope for eliminating unbalance due to the weight of the main rope 15.

  As shown in FIG. 1, the abnormality detector 20 according to this embodiment is used by being installed on a machine beam 13 directly under the hoisting machine 12. In the example shown in FIG. 1, the abnormality detector 20 is installed between the hoisting machine 12 and the car 16. For example, when the elevator is operated so that the car 16 descends, the abnormality detector 20 is lowered from the upper side. The main rope 15 passing to the side is flaw-detected to detect an abnormality.

  Next, the structure of the abnormality detector 20 will be described with reference to FIGS. 2 is a perspective view showing the structure of the abnormality detector 20, FIG. 3 is a view of the abnormality detector 20 viewed from the side, and FIG. 4 is a view of the abnormality detector 20 viewed from above. is there.

  As shown in FIGS. 2 to 4, the abnormality detector 20 includes the same number of magnetizers 21 to 24 as two wire ropes 15 a to 15 d constituting the main rope 15 to be flaw-detected, and two It has shaft members (fixing members) 25 and 26, a suspended portion (attachment member) 27, and two brackets 28 and 29.

  The four magnetizers, specifically, the first magnetizer 21, the second magnetizer 22, the third magnetizer 23, and the fourth magnetizer 24 include the first to fourth wire ropes 15a to 15a. Each corresponds to 15d. The first to fourth magnetizers 21 to 24 are sequentially arranged with a gap therebetween in the axial direction of the shaft members 25 and 26 (in other words, the width direction of the wire rope). Since the first to fourth magnetizers 21 to 24 have the same configuration, only the first magnetizer 21 will be described below with reference to FIG.

  As shown in FIG. 5, the first magnetizer 21 has a rectangular parallelepiped shape that is long in the vertical direction (movement direction) of the first wire rope 15 a, and the inside of the rectangular parallelepiped is divided into two upper and lower portions at the center on the long side. ing. One of the two is referred to as a leakage magnetic flux detection unit 31 and has a rectangular parallelepiped shape that is long in the vertical direction of the first wire rope 15a. Permanent magnets 32a and 32b are provided, and a detection coil 33 capable of detecting a change in magnetic flux is provided between the permanent magnets 32a and 32b.

  The two permanent magnets 32a and 32b are arranged so that the north and south poles face each other. In other words, the N pole of the permanent magnet 32a and the S pole of the permanent magnet 32b are opposed to each other, and the S pole of the permanent magnet 32a and the N pole of the permanent magnet 32b are opposed to each other.

  The other of the two divided portions is called a dummy portion 34 and has a rectangular parallelepiped shape that is long in the vertical direction of the first wire rope 15a.

  A rope sliding portion 35 penetrating vertically is formed on the surface of the leakage magnetic flux detection portion 31 that faces the first wire rope 15a. The first wire rope 15a can be accommodated in the rope sliding portion 35 and guides the first wire rope 15a. In addition, two through holes, specifically, an upper through hole 36a and a lower through hole 36b, through which two shaft members 25 and 26, which will be described later, penetrate, are provided on the side surfaces of the leakage magnetic flux detection unit 31 and the dummy unit 34. It is formed.

  The first magnetizer 21 configured as described above has a function of detecting an abnormality (for example, breakage of a strand) that has occurred in the first wire rope 15a accommodated in the rope sliding portion 35. doing. More specifically, the first magnetizer 21 magnetizes the first wire rope 15 a accommodated in the rope sliding portion 35 by the two permanent magnets 32 a and 32 b in the leakage magnetic flux detection unit 31, and Has a function of detecting a change in magnetic flux caused by a magnetic flux leaking from a broken portion (hereinafter referred to as “leakage magnetic flux”) by the detection coil 33.

  Returning to the description of FIGS. The first to fourth magnetizers 21 to 24 are arranged so that the leakage magnetic flux detection units 31 are adjacent to each other with a gap in the axial direction of the shaft members 25 and 26. More specifically, in the first to fourth magnetizers 21 to 24, the magnetic poles of the permanent magnets 32a and 32b existing in the leakage flux detection unit 31 are the same as those of the permanent magnets 32a and 32b included in the adjacent leakage flux detection unit 31. The magnetic poles are arranged so as to have the same polarity as each other. This is shown in FIG.

  FIG. 6 is a plan view of the first to fourth magnetizers 21 to 24 as viewed from the wire rope side. As shown in FIG. 6, the magnetic poles of the permanent magnets 32 a and 32 b inherent in each leakage magnetic flux detection unit 31 are the same as the magnetic poles of the permanent magnets 32 a and 32 b inherent in the adjacent leakage magnetic flux detection unit 31. The first to fourth magnetizers 21 to 24 are arranged.

  Returning to the description of FIGS. The two shaft members, specifically, the upper shaft member 25 and the lower shaft member 26, pass through the upper through hole 36a and the lower through hole 36b of the first to fourth magnetizers 21 to 24, respectively. . That is, the first to fourth magnetizers 21 to 24 are integrally fixed by the upper shaft member 25 and the lower shaft member 26. It is assumed that at least the vicinity of both ends of the upper shaft member 25 and the lower shaft member 26 are threaded portions. That is, the upper shaft member 25 and the lower shaft member 26 may be threaded portions near both ends or may be all screws.

  The suspending portion 27 is disposed on the back side (in other words, the surface facing the surface on which the rope sliding portion 35 is provided) of the first to fourth magnetizers 21 to 24. The suspension part 27 is formed in a U shape having an opening on the lower side so that the first to fourth magnetizers 21 to 24 can move back and forth. A through hole (hanging hole) 41 for installing the abnormality detector 20 on the machine beam 13 is formed on the upper surface of the hanging portion 27 (in other words, the surface facing the U-shaped opening). . In addition, two screw holes (not shown) for bolting brackets 28 and 29 described later are formed on both side surfaces of the hanging portion 27, respectively.

  The two brackets, specifically, the first bracket 28 and the second bracket 29 are respectively disposed on the axially outer sides of the first magnetizer 21 and the fourth magnetizer 24. The first bracket 28 and the second bracket 29 are rectangular plates that are long in the vertical direction of the first to fourth wire ropes 15a to 15d.

  In the first bracket 28, through holes 51a and 51b through which the upper shaft member 25 and the lower shaft member 26 pass are formed vertically. These through holes 51a and 51b are able to follow the back and forth movements of the first to fourth wire ropes 15a to 15d (in other words, the first to fourth magnetizers 21 to 24 move back and forth. The first bracket 28 is formed into a long hole that is long in the lateral direction (as possible).

  The upper shaft member 25 that protrudes outward in the axial direction from the through hole 51a formed on the upper side of the first bracket 28, and the lower that protrudes outward in the axial direction from the through hole 51b formed on the lower side of the first bracket 28. By attaching the nuts 61 to the screw portions respectively formed on the side shaft member 26, the first bracket 28 can tighten the first magnetizer 21 in the axial direction, and the first to fourth The magnetizers 21 to 24 and the first bracket 28 are integrally fixed. The nut 61 is loosely attached so as to be able to follow the left and right movements of the wire ropes 15a to 15d (in other words, the first to fourth magnetizers 21 to 24 can be moved to the left and right).

  Further, the first bracket 28 is formed with two through holes (not shown) corresponding to the screw holes of the hanging portion 27. The bolt 62 passes through the through hole and is bolted to the screw hole of the hanging portion 27, whereby the hanging portion 27 and the first bracket 28 are integrally fixed.

  Similar to the first bracket 28, the second bracket 29 is formed with through holes 51 a and 51 b through which the upper shaft member 25 and the lower shaft member 26 pass vertically. The through holes 51a and 51b are formed as long holes that are long in the short direction of the second bracket 29 so as to be able to follow the back and forth movement of the first to fourth wire ropes 15a to 15d.

  The upper shaft member 25 that protrudes outward in the axial direction from the through hole 51a formed on the upper side of the second bracket 29, and the lower portion that protrudes outward in the axial direction from the through hole 51b formed on the lower side of the second bracket 29. By attaching the nut 61 to the screw part formed on each of the side shaft members 26, the second bracket 29 can tighten the fourth magnetizer 24 in the axial direction. The magnetizers 21 to 24 and the second bracket 29 are integrally fixed. The nut 61 is loosely attached so as to be able to follow the left and right movements of the wire ropes 15a to 15d.

  Further, similarly to the first bracket 28, the second bracket 29 is formed with two through holes (not shown) corresponding to the screw holes of the hanging portion 27. The bolt 62 passes through the through hole and is bolted to the screw hole of the hanging portion 27, whereby the hanging portion 27 and the second bracket are fixed integrally.

  The abnormality detector 20 configured as described above is installed and used on the machine beam 13 as described above. More specifically, the abnormality detector 20 is fixed via a suspension part 27 on a support plate (not shown) provided so as to straddle a pair of left and right machine beams 13 provided so as to be spaced apart and extend in parallel. It is installed and used by (hanging).

  Here, the anomaly detector 20 according to the present embodiment and the anomaly detector 100 shown in FIGS. 7 to 10 will be compared to describe the effects obtained from the present embodiment. 7 is a perspective view showing a structure of a conventional abnormality detector 100, FIG. 8 is a view of the abnormality detector 100 as viewed from the side, and FIG. 9 is a view of the abnormality detector 100 as viewed from above. FIG. 10 is a plan view of the first to fourth magnetizers 21 to 24 constituting the abnormality detector 100 as viewed from the wire rope side. The abnormality detector 100 having the structure shown in FIGS. 7 to 10 includes the first to fourth magnetizers 21 such that the leakage flux detectors 31 constituting the first to fourth magnetizers 21 to 24 are arranged in a staggered manner. ˜24 are different from the abnormality detector 20 according to the present embodiment in that they are arranged.

  In the abnormality detector 100 having the structure shown in FIGS. 7 to 10, two permanent magnets 32 a and 32 b inherent in the leakage magnetic flux detection unit 31 are replaced with two permanent magnets 32 a and 32 b inherent in another leakage magnetic flux detection unit 31. The first to fourth magnetizers 21 to 24 are arranged so that the leakage flux detectors 31 are arranged in a staggered manner so as not to interfere. According to this, since the two permanent magnets 32a and 32b existing in the leakage magnetic flux detection unit 31 do not interfere with the two permanent magnets 32a and 32b included in another leakage magnetic flux detection unit 31, this is accompanied by magnetic interference. The advantage that generation | occurrence | production of the change (noise signal) of magnetic flux can be suppressed can be acquired.

  However, in the abnormality detector 100 having the structure shown in FIGS. 7 to 10, one wire rope is magnetized using only the two permanent magnets 32 a and 32 b inherent in one leakage magnetic flux detection unit 31. As shown, the magnetic flux density becomes sparse. That is, the amount of leakage magnetic flux caused by the abnormality generated in the wire rope is also small, and the change in magnetic flux is also small. Therefore, as shown in FIG. 12, the change in magnetic flux due to the abnormality (abnormality detection signal) and the movement of the wire rope. Inconvenience that it is difficult to distinguish a change in magnetic flux (noise signal) caused by (swing).

  On the other hand, in the abnormality detector 20 according to the present embodiment, the magnetic poles of the permanent magnets 32a and 32b existing in the leakage magnetic flux detection unit 31 are the same as the magnetic poles of the permanent magnets 32a and 32b existing in the adjacent leakage magnetic flux detection unit 31. The first to fourth magnetizers 21 to 24 are arranged so as to have the same polarity. According to this, since the two permanent magnets 32a and 32b existing in the leakage magnetic flux detection unit 31 interfere with the two permanent magnets 32a and 32b existing in another adjacent leakage magnetic flux detection unit 31, this is accompanied by magnetic interference. Although a change in magnetic flux (noise signal) occurs, the following advantages can be obtained.

  In the abnormality detector 20 according to the present embodiment, one wire rope is adjacent to the permanent magnets 32a and 32b existing in the leakage flux detection unit 31 of the magnetizer that accommodates the wire rope, and the leakage flux detection unit 31. Since the magnets are magnetized by using the permanent magnets 32a and 32b inherent in the one or two leakage magnetic flux detectors 31 that perform the magnetic flux density, as shown in FIG. That is, the amount of magnetic flux leakage due to an abnormality occurring in the wire rope increases and the change in magnetic flux also increases (in other words, the overall detection output improves and the detection peak also improves), as shown in FIG. It becomes easy to discriminate between a change in magnetic flux caused by abnormality and a change in magnetic flux caused by magnetic interference or a change in magnetic flux caused by the movement of the wire rope.

  According to the first embodiment described above, the abnormality detector 20 includes the permanent magnets 32a and 32b in which the magnetic poles of the permanent magnets 32a and 32b existing in the leakage magnetic flux detection unit 31 exist in the adjacent leakage magnetic flux detection unit 31. Since the first to fourth magnetizers 21 to 24 are arranged so as to have the same polarity as the magnetic poles of the wire ropes, the magnetic flux densities of the wire ropes 15a to 15d accommodated in the rope sliding portion 35 are made dense. can do.

  According to this, as described above, the leakage magnetic flux that leaks due to the abnormality occurring in the wire ropes 15a to 15d increases, and the change in magnetic flux can be increased (detection peak can be improved). Therefore, the maintenance staff can easily determine that the detected change in magnetic flux is a change in magnetic flux due to leakage of magnetic flux from the deteriorated portion.

  In the present embodiment, the number of wire ropes constituting the main rope 15 is not limited to this, although the number of wire ropes constituting the main rope 15 is four. For this reason, the number of magnetizers constituting the abnormality detector 20 is not limited to four.

  Further, since the abnormality detector 20 according to the present embodiment does not stagger the leakage magnetic flux detection units 31 like the abnormality detector 100, the configuration may be such that the dummy unit 34 constituting the magnetizer is omitted. . Or the structure which replaced the dummy part 34 with the leakage magnetic flux detection part 31 may be sufficient. In this case, the distance between the two permanent magnets 32a and 32b inherent in the leakage magnetic flux detection unit 31 is approximately doubled, and the range in which the change in magnetic flux can be detected is widened. The advantage that it can be shortened can be obtained. Further, as described above, since the distance between the two permanent magnets 32a and 32b inherent in the leakage magnetic flux detection unit 31 is increased, the S / N ratio is improved although the detection output is slightly reduced, and the magnetic flux caused by the abnormality Can be more easily discriminated.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in that a spacer is provided in forming a gap between the magnetizers 21 to 24. Further, in the first embodiment, in order to follow the movement of each wire rope 15a to 15d, each magnetizer 21 to 24 is configured to be movable back and forth and left and right. However, in this embodiment, each wire rope 15a. It is different from the first embodiment in that each of the magnetizers 21 to 24 does not follow the movement of ˜15d and cannot move back and forth and right and left.

  In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 15 is a perspective view of the abnormality detector 20 according to the second embodiment as viewed from the front side, FIG. 16 is a perspective view of the abnormality detector 20 as viewed from the back side, and FIG. FIG. 18 is a diagram of the detector 20 as viewed from the side, and FIG. 18 is a diagram of the abnormality detector 20 as viewed from above.

  In the abnormality detector 20 shown in FIGS. 15 to 18, the brackets 28 and 29 are not provided on the side surfaces of the first and fourth magnetizers 21 and 24, and each wire rope is interposed between the magnetizers 21 to 24. Spacers 71 a to 71 c that match the distance between 15 a to 15 d are provided, and nuts 61 are attached to both ends of the upper shaft member 25 and the lower shaft member 26. The width of the spacers 71a to 71c (the length in the width direction of the wire rope) is determined according to the interval between the wire ropes 15a to 15d. The nut 61 is attached tightly so as not to follow the left and right movements of the wire ropes 15a to 15d, in other words, to suppress the left and right movements of the first to fourth magnetizers 21 to 24. It is done.

  Further, in the abnormality detector 20 according to the present embodiment, a fastening portion 72 is provided instead of the hanging portion 27. The fastening portion 72 is formed in an L shape and has the same number of magnetizers as the number of magnetizers on the surface facing the first to fourth magnetizers 21 to 24 (in other words, the surface extending in the vertical direction of the wire rope). A through hole is formed. The bolt 73 passes through the through hole, and is bolted to the back surface of each dummy portion 34 constituting the first to fourth magnetizers 21 to 24, whereby the first to fourth magnetizers 21 to 24 and The fastening part 72 is fixed integrally.

  Further, a surface extending in a horizontal direction (in other words, a direction orthogonal to the vertical direction of the wire rope) from the surface facing the first to fourth magnetizers 21 to 24 is a through hole for installation on the machine beam 13. (Fastening hole) 74 is formed. A bolt (not shown) passes through the through hole 74, and a nut (not shown) is tightly attached to the tip of the bolt and fixed to the machine beam 13, so that the first to fourth magnetizers 21 to 24 are moved in the front, rear, left and right directions. Movement can be suppressed. That is, the first to fourth magnetizers 21 to 24 cannot follow the front and rear, right and left movements of the wire ropes 15a to 15d.

  The anomaly detector 20 according to the present embodiment is fixed via a fastening portion 72 on a support plate (not shown) provided so as to straddle a pair of left and right machine beams 13 provided so as to extend parallel to each other. Installed (used) and used.

  According to the abnormality detector 20 configured as described above, there is a disadvantage that the first to fourth magnetizers 21 to 24 cannot follow the movements of the wire ropes 15a to 15d. The following advantages can be obtained.

  As described above, the abnormality detector 20 according to the present embodiment includes the spacers 71a to 71c that match the distances between the wire ropes 15a to 15d, and from the side surfaces of the first and fourth magnetizers 21 and 24. Since the nut 61 is tightened and fixed tightly, the movement (swaying) of the wire rope in the horizontal direction during flaw detection can be suppressed. In addition, since the L-shaped fastening portion 72 is fixed to the back surface of the first to fourth magnetizers 21 to 24 and fastened to the machine beam 13, the abnormality detector 20 is connected to the wire rope during the flaw detection. It is also possible to suppress movement in the front-rear direction. That is, a change in magnetic flux (noise signal) due to the movement of each of the wire ropes 15a to 15d can be suppressed.

  In general, the change in the magnetic flux due to the movement of each of the wire ropes 15a to 15d is correspondingly large, and it is difficult to distinguish the change from the magnetic flux due to the leakage magnetic flux from the deteriorated portion. For this reason, by suppressing the change in the magnetic flux caused by the movement of each of the wire ropes 15a to 15d, only the change in the magnetic flux due to the abnormality occurring in the wire rope and the change in the magnetic flux due to magnetic interference are detected by the abnormality detector 20. As a result, as shown in FIG. 19, a change in magnetic flux (abnormality detection signal) caused by an abnormality occurring in the wire rope can be more easily discriminated.

  According to the second embodiment described above, the abnormality detector 20 includes the first to fourth magnetizers 21 to 24 that are prevented from moving back and forth and from side to side. The change in the magnetic flux due to the movement of the wire ropes 15a to 15d can be suppressed, and the maintenance staff can confirm that the detected change in the magnetic flux is the change in the magnetic flux due to the leakage of the magnetic flux from the deteriorated portion. It can be easily distinguished.

  According to at least one embodiment described above, even a maintenance person with low skill level can easily detect that the detected change in magnetic flux is a change in magnetic flux due to leakage of magnetic flux from a deteriorated portion. A distinguishable abnormality detector and abnormality detection method can be provided.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Elevator control apparatus, 12 ... Hoisting machine, 13 ... Machine beam, 14 ... Main sheave, 15 ... Main rope, 15a-15d ... 1st-4th wire rope, 16 ... Ride car, 17 ... Counterweight, DESCRIPTION OF SYMBOLS 18 ... Compen rope, 19 ... Compensation, 20 ... Abnormality detector, 21-24 ... 1st-4th magnetizer, 25 ... Upper shaft member, 26 ... Lower shaft member, 27 ... Hanging part, 28 ... 1st bracket, 29 ... 2nd bracket, 31 ... Leakage magnetic flux detection part, 32a, 32b ... Permanent magnet, 33 ... Detection coil, 34 ... Dummy part, 71a-71c ... Spacer, 72 ... Fastening part.

Claims (5)

A plurality of magnetizers for magnetizing a plurality of wire ropes of an elevator and detecting a change in magnetic flux;
A fixing member that integrally fixes the magnetizers;
An attachment member for attaching each magnetizer fixed integrally by the fixing member to a part of the elevator, and
Each of the magnetizers
A width direction of the wire rope, including a pair of magnets arranged to face each other with a predetermined interval in the moving direction of the wire rope, and a sensor that detects a change in magnetic flux of the wire rope magnetized by the pair of magnets Magnetic flux detectors arranged with a predetermined gap therebetween,
A sliding part that is attached to the surface of the magnetic flux detection part and guides the sliding of the wire rope,
The pair of magnets is
An abnormality detector, wherein magnetic poles different from each other are arranged so as to face each other, and a pair of magnets included in adjacent magnetic flux detectors are arranged so that the same magnetic poles are adjacent to each other. A plurality of spacers provided between the magnetizers;
The width of each spacer is
The abnormality detector according to claim 1, wherein the abnormality detector is determined according to an interval between the wire ropes. The mounting member is
The abnormality detector according to claim 1, wherein the abnormality detector is fixed to a back surface of each magnetizer so as to suppress movement of each magnetizer in the front-rear and left-right directions and fastened to a part of the elevator. The mounting member is
The movement of each magnetizer in the front-rear direction orthogonal to the movement direction of the wire rope is suppressed, and the movement of each magnetizer in the left-right direction that is the width direction of the wire rope is suppressed. The abnormality detector according to claim 3. A plurality of magnetizers that magnetize a plurality of wire ropes of an elevator and detect a change in magnetic flux, a fixing member that integrally fixes the magnetizers, and the magnetizations that are integrally fixed by the fixing members An attachment member for attaching a device to a part of the elevator, and each magnetizer includes a pair of magnets arranged to face each other at a predetermined interval in the moving direction of the wire rope, and the pair of magnets. A sensor for detecting a change in the magnetic flux of the magnetized wire rope, and a magnetic flux detector arranged with a predetermined gap between each other in the width direction of the wire rope, and attached to the surface of the magnetic flux detector, An abnormality detection method applied to an abnormality detector having a sliding portion for guiding the sliding of the wire rope,
Arranging the pair of magnets so that different magnetic poles face each other, and arranging the pair of magnets included in adjacent magnetic flux detectors so that the same magnetic poles are adjacent to each other. Characteristic abnormality detection method.

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