Elevator rope tester

Abstract

We provide an elevator rope tester that magnetizes more than half of the strands. [Solution] In the elevator rope tester, the first magnet and the second magnet are each positioned on the first radial side of the rope, and the magnetic part has a first recess and a second recess that are positioned along a region of at least half the circumference of the rope, centered on a first radial position on the outer surface of the rope, the first recess and the second recess are positioned apart in the extension direction and are positioned between the first magnet and the second magnet, the respective lengths in the extension direction of the first magnet and the second magnet satisfy a predetermined condition, and the distance between the outer end of the first magnet and the inner end of the second magnet in the extension direction satisfies a predetermined condition.

Description

[Technical Field]

[0001] This specification relates to a rope tester for elevators. [Background technology]

[0002] Conventionally, for example, an elevator rope tester includes a first magnet and a second magnet, which are positioned apart in the direction of extension of the rope, in order to magnetize a stranded rope; a magnetic part that collects magnetic flux leaking from the rope; and a detection part that detects the magnetic flux passing through the inside of the magnetic part (for example, Patent Document 1). The first magnet and the second magnet are each positioned on the first radial side of the rope with respect to the rope.

[0003] The magnetic portion includes a first recess and a second recess, which are arranged along a region covering half the circumference of the rope, centered on a first radial position on the outer surface of the rope. The first recess and the second recess are spaced apart in the extension direction and are located between the first magnet and the second magnet.

[0004] A rope, being a stranded wire, consists of multiple strands that are twisted together. Magnetic flux tends to propagate along paths with low magnetic resistance, making it easier for it to continue propagating within a given strand and less likely to transfer to another strand.

[0005] Incidentally, if the broken portion of the rope is not magnetized, magnetic flux does not leak from the broken portion, and therefore the detection unit does not detect the leaked magnetic flux through the magnetic part. For this reason, there is a demand for an elevator rope tester that can magnetize more than half of the strands. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-59601 [Overview of the project] [Problems that the invention aims to solve]

[0007] Therefore, the challenge is to provide an elevator rope tester that can magnetize more than half of the strands. [Means for solving the problem]

[0008] Elevator rope testers are, To magnetize a stranded rope, a first magnet and a second magnet are arranged apart in the direction of extension of the rope, A magnetic unit that collects magnetic flux leaking from the aforementioned rope, The system includes a detection unit for detecting the magnetic flux passing through the inside of the magnetic part, Each of the first magnet and the second magnet is positioned on the first radial side of the rope with respect to the rope. The magnetic portion includes a first recess and a second recess that are arranged along a region of at least half the circumference of the rope, centered on a first radial position on the outer surface of the rope, The first recess and the second recess are arranged apart in the extending direction and are positioned between the first magnet and the second magnet. The length L of the extension direction of each of the first magnet and the second magnet M The following equation A is satisfied, The distance D between the outer end of the first magnet and the inner end of the second magnet in the extension direction. M The following equation B is satisfied. [Formula A] TIFF0007898676000002.tif74150 Here, L R This is the length of the aforementioned rope, N S This is the number of strands in the aforementioned rope. [Formula B] TIFF0007898676000003.tif11150 Here, N is a natural number. [Brief explanation of the drawing]

[0009] [Figure 1] Perspective view of an elevator rope tester according to one embodiment. [Figure 2] Front view of an elevator rope tester according to the same embodiment. [Figure 3] Plan view of the main part of the elevator rope tester according to the same embodiment. [Figure 4] Diagram illustrating the configuration of the magnet and magnetic parts. [Figure 5] Diagram illustrating the configuration of the magnet and magnetic part according to the first embodiment. [Figure 6] Enlarged view of the VIA and VIb regions in Figure 5. [Figure 7] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Figure 8] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Figure 9] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Figure 10] Diagram illustrating the configuration of the magnet and magnetic part according to the second embodiment. [Figure 11] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Figure 12] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Figure 13] Diagram illustrating the configuration of the magnet and magnetic part according to the same embodiment. [Modes for carrying out the invention]

[0010] In each drawing, the dimensions of components may be enlarged or reduced from their actual dimensions for the sake of clarity, and the dimensional ratios between drawings may not be consistent. Furthermore, in each drawing, some components may be omitted for the sake of clarity.

[0011] Terms including ordinal numbers such as "1st," "2nd," etc., are used to describe various components, but these terms are used solely for the purpose of distinguishing one component from others, and the components are not particularly limited by these terms. Furthermore, the number of components including ordinal numbers is not particularly limited; for example, there may be only one. Also, the ordinal numbers used in the following specification and drawings may differ from the ordinal numbers described in the claims.

[0012] The following description will explain one embodiment of an elevator rope tester with reference to Figures 1 to 13. Note that the following embodiment is provided as an example to aid in understanding the configuration of the elevator rope tester, and does not limit the configuration of the elevator rope tester.

[0013] As shown in Figures 1 to 3, the elevator rope tester (hereinafter also simply referred to as "rope tester") 1 is used, for example, to inspect an elevator rope X1 used in an elevator. For example, the rope tester 1 may inspect a moving rope X1, or for example, the rope tester 1 may inspect a stationary rope X1 by moving towards it.

[0014] In each figure, the first direction D1 is the elongation direction D1, which is the direction in which the rope X1 being inspected extends, the second direction D2 and the third direction D3 are the radial directions D2 and D3 of the rope X1 being inspected, and the first to third directions D1 to D3 are mutually orthogonal directions. Note that one side of the second direction D2 (the direction indicated by the arrow in each figure), D2a, is called the first radial direction D2a.

[0015] The rope tester 1 may, for example, include an insertion groove 2 extending in a first direction (also called the "groove length direction") D1 for the insertion of a rope X1, and a gripping part 3 for gripping. Furthermore, for example, as in this embodiment, the gripping part 3 may be located at one end of the rope tester 1 in the second direction D2 (the end on the first radial direction D2a side), and the insertion groove 2 may be located at the other end of the rope tester 1 in the second direction D2.

[0016] For example, the rope tester 1 may be used by gripping the gripping part 3, or the rope tester 1 may be used with the gripping part 3 fixed to the elevator device or structure by an instrument or the like. Also, in Figures 1 to 3, the enlarged view of the dashed-dotted area shows an end view.

[0017] The insertion groove 2 may, for example, as in this embodiment, comprise a pair of groove sides 2a, 2a that are separated in the third direction (also called the "groove width direction") D3, and a groove bottom surface 2b that connects the pair of groove sides 2a, 2a. As a result, the insertion groove 2 is open in the second direction (also called the "groove depth direction") D2.

[0018] Furthermore, for example, as in this embodiment, the rope tester 1 may be configured such that it is equipped with a guide portion 2c for guiding the rope X1, and the guide portion 2c is made up of the groove bottom surface 2b of the insertion groove 2. Alternatively, for example, as in this embodiment, the groove side surface 2a may be a flat surface, and the groove bottom surface 2b may be a curved surface that is a concave arc when viewed in the groove length direction D1.

[0019] Furthermore, the rope tester 1 may also include a magnetization section 4 for magnetizing the rope X1, as in this embodiment. The magnetization section 4 includes a first magnet 11 and a second magnet 12 that are spaced apart in the extension direction D1 in order to magnetize the rope X1. The magnetization section 4 may also include a magnetic path section 4a that magnetically connects the first magnet 11 and the second magnet 12, as in this embodiment.

[0020] As a result, the first magnet 11, the second magnet 12, and the magnetic path section 4a can work together with the rope X1 to form a ring-shaped magnetic circuit. The magnets 11 and 12 are not particularly limited, but may be permanent magnets or electromagnets, for example. The magnetic path section 4a is not particularly limited, but is made of a magnetic material with high magnetic permeability, and may be made of pure iron or low-carbon steel, for example.

[0021] Furthermore, the rope tester 1 includes a magnetic section 5 that collects magnetic flux leaking from the magnetized rope X1, and a detection section 6 that detects the magnetic flux passing through the inside of the magnetic section 5. Although not particularly limited, the detection section 6 may be, for example, various magnetic sensors (Hall element, coil) that convert the magnitude of the magnetic flux into the magnitude of a voltage (current).

[0022] The magnetic part 5 includes a first recess 13 and a second recess 14 arranged along the outer circumferential surface of the rope X1 to be inspected. Thus, the first recess 13 and the second recess 14 constitute a part of the insertion groove 2. Alternatively, for example, as in this embodiment, the rope tester 1 may be configured to include a non-magnetic part 7 having a permeability lower than that of the magnetic part 5, and the insertion groove 2 may be composed of the recesses 13, 14 and the non-magnetic part 7.

[0023] The magnetic part 5 is not particularly limited, but is made of a magnetic material (ferromagnetic material) and has high magnetic permeability, and may be made of, for example, pure iron or low carbon steel. The non-magnetic part 7 is not particularly limited, but is made of a non-magnetic material (paramagnetic material, diamagnetic material) and has low magnetic permeability, and may be made of, for example, a metal with a hardness lower than the hardness of the rope X1 (e.g., aluminum bronze, aluminum) or a hard resin.

[0024] Furthermore, for example, the permeability of a magnetic material is preferably 100 times or more than that of a non-magnetic material, and more preferably 1000 times or more. Furthermore, for example, the permeability of a magnetic material is preferably 100 times or more than that of air, and more preferably 1000 times or more.

[0025] Furthermore, the magnetic section 5 may also include a connecting section 5a that magnetically connects the recesses 13 and 14 to the detection section 6, as in this embodiment. As a result, the detection section 6 detects the magnetic flux passing through the inside of the magnetic section 5, and the detection section 6 can detect the magnetic flux leaking from the magnetized rope X1.

[0026] Furthermore, the rope tester 1 may output the information detected by the detection unit 6 to an external device (for example, a diagnostic system that diagnoses the rope X1 based on the information) via wired or wireless connection. The connection unit 5a and the detection unit 6 may be in contact, or they may be separated by a gap.

[0027] Furthermore, the first magnet 11 and the second magnet 12 may each be positioned on the first radial direction D2a side with respect to the insertion groove 2, for example, as in this embodiment. In this way, the first magnet 11 and the second magnet 12 are each positioned on the first radial direction D2a side with respect to the rope X1.

[0028] Furthermore, the first recess 13 and the second recess 14 are positioned apart in the extension direction D1 and are located between the first magnet 11 and the second magnet 12 in the extension direction D1. Alternatively, as in this embodiment, the pair of connecting parts 5a may sandwich the detection part 6 in the extension direction D1.

[0029] Furthermore, the recesses 13 and 14 may, for example, as in this embodiment, comprise a pair of concave planes 15, 15 separated in the third direction D3, and a concave curved surface 16 that is a concave arc when viewed in the extending direction D1 and connects the pair of concave planes 15, 15. The rope X1 guided by the guide portion 2c is positioned inside the recesses 13 and 14.

[0030] As a result, as shown in Figure 3, the concave curved surfaces 16 of the recesses 13 and 14 (only the first recess 13 is shown in Figure 3) are arranged along a region X2 that covers at least half the circumference of the rope X1 (hereinafter also referred to as the "half-circumference region"), centered at the position X2a in the first radial direction D2a on the outer surface of the rope X1 (hereinafter also referred to as the "half-circumference center position").

[0031] As shown in Fig. 4, the rope X1, which is a wire rope, includes a plurality of strands that are twisted together. Although not particularly limited, for example, in Fig. 4 (Figs. 5 to 13 are the same), the rope X1 includes eight strands, and for example, in Fig. 4, one of the eight strands is colored so that the specific strands are easy to distinguish.

[0032] First length L R is the longer length L of the rope X1 R is. Longer length (more than 1) L R refers to the length measured parallel to the central axis of the rope X1 up to the point where a predetermined strand makes exactly one revolution around the rope X1. That is, the longer length L R refers to the pitch of the helix formed by the strands constituting the outer layer of the rope X1.

[0033] Second length L M is the magnet length L M and is the length in the extending direction D1 of each of the first magnet 11 and the second magnet 12. Also, the third length L C is the magnetic part length L C is called and is the distance between the center 13a of the first recess 13 and the center 14a of the second recess 14 in the extending direction D_{1}.

[0034] First distance D M is called the magnet-to-magnet distance D M and is the distance between the outer end 11a of the first magnet 11 and the inner end 12b of the second magnet 12 (or the distance between the inner end 11b of the first magnet 11 and the outer end 12a of the second magnet 12) in the extending direction D1. Second distance D C is called the magnet-magnetic part distance D C and is the distance between the inner end 11b (or the inner end 12b of the second magnet 12) of the first magnet 11 and the center 5b between the first recess 13 and the second recess 14 in the extending direction D1. <00​​​​Next, a first embodiment of the configuration of the magnets 11, 12 and recesses 13, 14 in the rope tester 1 will be described with reference to Figures 5 to 9. Note that the configurations described in the following embodiments are illustrative examples to aid in understanding the configurations of the magnets 11, 12 and recesses 13, 14, and do not limit the configurations of the magnets 11, 12 and recesses 13, 14.

[0036] First, it is preferable to magnetize more than half of the strands so that the magnetized strands are located throughout the entire half-circumferential region X2 at least a portion of the position between the first recess 13 and the second recess 14. With such a configuration, for example, if a broken portion of the rope X1 exists in the half-circumferential region X2, the broken portion is magnetized at a specific position between the center 13a of the first recess 13 and the center 14a of the second recess 14, causing magnetic flux to leak out, and the leaked magnetic flux can be collected by the magnetic part 5.

[0037] Therefore, the magnet length L in this configuration... M , distance D between magnets M and magnet-magnetic part distance D C We will find it as follows.

[0038] First, as shown in Figures 5 and 6, in order to magnetize more than half of the strands, the magnets 11 and 12 need to be positioned along more than half of the strands. Note that the number of strands N in the rope X1 S If the number of strands is even, half of them are [Number of strands N S / 2] is the number of strands, and the number of strands N of rope X1 S If the number of strands is odd, half of them are [Number of strands N S The number of strands is [ / 2 + 1 / 2]. And magnets 11 and 12 are arranged along half of the strands, along the magnet length L. M The first minimum magnet length L M1 In that case, the magnet length L M The following equation 1 must be satisfied.

[0039] [Formula 1] TIFF0007898676000004.tif11150

[0040] By the way, as shown in Figure 6, in a view in the radial direction D3 (D2), the central part of the strand bulges outward in the radial direction D2 (D3). Therefore, for example, in order for magnets 11 and 12 to be arranged along half of the four strands, the magnet length L M This requires the length of at least three strands. Specifically, the number of strands N S If there are eight magnets, the first minimum magnet length L M1 This represents the surface length of the three strands in the elongation direction D1.

[0041] Thus, the number of strands N in rope X1 S If it is an even number, the first minimum magnet length L M1 [Number of strands N] S / 2-1] This represents the surface length of the strand in the elongation direction D1, and the number of strands N in the rope X1. S If the number is odd, the first minimum magnet length L M1 [Number of strands N] S / 2-1 / 2]This is the surface length of the strand in the elongation direction D1. Note that the surface length of one strand in the elongation direction D1 is [Longer than L R / Number of strands N S Therefore, the first minimum magnet length L is... M1 This is given by equation 2 below.

[0042] [Formula 2] TIFF0007898676000005.tif58150

[0043] Here, the magnet length L M The first minimum magnet length L M1 (L M =L M1 )For the configuration, refer to Figures 5 and 6, and the distance between magnets D M and magnet-magnetic part distance D C We will find it as follows.

[0044] As shown in Figures 5 and 6, the magnet length L MHowever, the first minimum magnet length L M1 In this case, in order to magnetize half of the four strands, it is necessary to position each of the first magnet 11 and the second magnet 12 along the four common strands. Thus, in order to magnetize half of the strands, each of the first magnet 11 and the second magnet 12 must be positioned along half of the length (i.e., the first minimum magnet length L) M1 It needs to be placed along the common strand of (minutes). Therefore, the magnet length L M However, the first minimum magnet length L M1 In this case, the distance between magnets D M The following equation 3 must be satisfied.

[0045] [Formula 3] TIFF0007898676000006.tif22150 Here, N is a natural number.

[0046] As a result, the four common strands are magnetized by the first magnet 11 and the second magnet 12. For example, as shown in Figure 6, when the first magnet 11 and the second magnet 12 are arranged along the first to fourth strands, the magnetic flux generated in the first magnet 11 is transmitted to the second magnet 12 through the first to fourth strands, thus magnetizing the first to fourth strands.

[0047] In Figure 6, the dashed line indicates the flow of magnetic flux between rope X1 and magnets 11 and 12, and the strands indicated by the numbers "1" to "8" represent the 1st to 8th strands, respectively. Also, in Figures 5 and 6 (and similarly in Figures 7 to 13), magnetized strands are indicated by color.

[0048] Furthermore, since magnetic flux easily propagates along paths with low magnetic resistance, it tends to continue propagating within a given strand and is less likely to transfer to another strand. As a result, the common strand along which the first magnet 11 and the second magnet 12 are arranged becomes magnetized. On the other hand, strands adjacent to a magnetized strand may also be slightly magnetized by the propagation of magnetic flux from the magnetized strand.

[0049] Furthermore, as shown in Figure 5, the magnet length L M However, the first minimum magnet length L M1 Furthermore, the distance D between the magnets M However, the length L R When the distance is a multiple of 2 (2 times in Figure 5), the position where the four magnetized strands are located throughout the entire semicircular region X2 is the center position between the first magnet 11 and the second magnet 12 in the extension direction D1 of the rope X1 (hereinafter also referred to as the "center position between magnets") X3.

[0050] Therefore, the magnet length L M However, the first minimum magnet length L M1 Furthermore, the distance D between the magnets M However, the length L R When the distance is a multiple of 2, for half of the magnetized strands to be located throughout the semicircular region X2 at a specific position between the center 13a of the first recess 13 and the center 14a of the second recess 14, the magnet-magnetic part distance D C The following equation 4 must be satisfied.

[0051] [Formula 4] TIFF0007898676000007.tif73150

[0052] As a result, the center position X3 between the magnets, where half of the magnetized strands are located throughout the semicircular region X2, is located between the center 13a of the first recess 13 and the center 14a of the second recess 14. In Figure 5, the position of the VV line is the center position X3 between the magnets, and the position of the magnetic part 5 (recesses 13, 14) is D C =D C1 This is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extension direction D1.

[0053] Next, the magnet length L M The first minimum magnet length L M1 With the above configuration, refer to Figures 7 to 9, and consider the distance D between the magnets. M and magnet-magnetic part distance D CWe will find it as follows.

[0054] First, as shown in Figures 7 and 8, the magnet length L M However, the first minimum magnet length L M1 Even if the length is longer by a predetermined length α than the first minimum magnet length L, in order to magnetize four or more strands, each of the first magnet 11 and the second magnet 12 must be positioned along four or more common strands. That is, in order to magnetize more than half of the strands, each of the first magnet 11 and the second magnet 12 must be positioned along more than half (i.e., the first minimum magnet length L) M1 They need to be placed along a common strand (of a certain length or longer).

[0055] For example, the distance D between magnets M As shown in Figure 7, the length L is greater. R From a distance that is a multiple of 2 (2 times in Figure 7) shorter by a predetermined length α, as shown in Figure 8, the distance L is shorter. R The distance must be longer by a predetermined length α than a distance that is a multiple of 2 (in Figure 8, twice the distance). Therefore, the magnet length L M However, the first minimum magnet length L M1 If the above conditions are met, the distance between magnets D M The following equation 5 must be satisfied.

[0056] [Formula 5] TIFF0007898676000008.tif13150

[0057] This allows the first magnet 11 and the second magnet 12 to have more than half (i.e., the first minimum magnet length L) M1 They can be placed along a common strand (of a minute or more). Therefore, more than half of the common strands on which the first magnet 11 and the second magnet 12 are placed will be magnetized.

[0058] In addition, in the above formula 5, L M =L M1 In this case, equation 3 above is obtained. Also, in Figure 7, the position of line VII-VII is the center position X3 between the magnets, and the position of the magnetic part 5 (recess 13, 14) is D C=D C1 is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extending direction D1. Also, in FIG. 8, the position of the VIII-VIII line is the center position X3 between the magnets, and the position of the magnetic part 5 (the concave parts 13, 14) is D C =D C1 is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extending direction D1.

[0059] Also, as shown in FIG. 9, the magnet length L M is longer than the first minimum magnet length L M1 by a predetermined length α, and when the distance D M between the magnets is a multiple of 2 of the length L R (in FIG. 9, 2 times), the range where the magnetized strands are located in the entire semi-circular region X2 is a range of a predetermined length α centered on the center position X3 between the magnets.

[0060] Therefore, when the magnet length L M is greater than or equal to the first minimum magnet length L M1 and the distance D M between the magnets is a multiple of 2 of the length L R , in order for at least a part of the magnetized half of the strands to be located in the entire semi-circular region X2 at least at some positions between the center 13a of the first concave part 13 and the center 14a of the second concave part 14, the magnet-magnetic part distance D C needs to satisfy the following formula 6.

[0061] [Formula 6] TIFF0007898676000009.tif73150

[0062] As a result, at least a part of the range where the magnetized half of the strands are located over the entire semi - circumference region X2 (a range of a predetermined length α centered on the center position X3 between the magnets) is located between the center 13a of the first recess 13 and the center 14a of the second recess 14. In FIG. 9, the position of the IXa - IXa line is a position separated from the center position X3 between the magnets by 1 / 2 of the predetermined length α toward the first magnet 11 side, and the position of the IXb - IXb line is a position separated from the center position X3 between the magnets by 1 / 2 of the predetermined length α toward the second magnet 12 side, and the position of the magnetic part 5 (recesses 13, 14) is C =D C1 the position (the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extending direction D1).

[0063] Also, when the magnet length L M is equal to or greater than the first minimum magnet length L M1 the magnet - to - magnet distance D M is not only a distance that is a multiple of 2 of the length L R but also a distance that satisfies the above formula 5. At this time, compared with the configuration where the magnet - to - magnet distance D M is a distance that is a multiple of 2 of the length L R in the case where the magnet - to - magnet distance D M satisfies the above formula 5, the length in the extending direction D1 where the entire semi - circumference region X2 is magnetized is the difference (|D M − 2N×L R |) between the magnet - to - magnet distance D M and the distance that is a multiple of 2 of the length L R shorter.

[0064] Therefore, when the magnet length L M is equal to or greater than the first minimum magnet length L M1 and the magnet - to - magnet distance D M satisfies the above formula 5, in order for the magnetized strands to be located over the entire semi - circumference region X2 at least at a part of the position between the center 13a of the first recess 13 and the center 14a of the second recess 14, the magnet - to - magnetic - part distance D C needs to satisfy the following formula 7.

[0065] [Formula 7] TIFF0007898676000010.tif73150

[0066] Thus, in the first embodiment, by satisfying formulas 1, 2, 5, and 7 above, more than half of the magnetized strands are located throughout the semicircular region X2 at least a portion of the position between the center 13a of the first recess 13 and the center 14a of the second recess 14. M =L M1 And D M = 2N × L R In that case, the above equation 4 becomes, and D M = 2N × L R In this case, the above equation 6 is obtained.

[0067] <Second Example> Next, a second embodiment of the configuration of the magnets 11, 12 and recesses 13, 14 in the rope tester 1 will be described with reference to Figures 10 to 13. Note that the configuration in the following embodiment is provided as an example to aid in understanding the configuration of the magnets 11, 12 and recesses 13, 14, and is not intended to limit the configuration of the magnets 11, 12 and recesses 13, 14.

[0068] First, it is even more preferable to magnetize more than half of the strands so that the magnetized strands are located throughout the entire half-circumferential region X2, from the center 13a of the extending direction D1 of the first recess 13 to the center 14a of the extending direction D1 of the second recess 14. With such a configuration, for example, if a broken portion of the rope X1 exists in the half-circumferential region X2, the broken portion is magnetized and continues to leak magnetic flux throughout the entire area between the first recess 13 and the second recess 14, so that the leaked magnetic flux can be collected by the magnetic part 5.

[0069] Therefore, the magnet length L in this configuration... M , distance D between magnets M and magnet-magnetic part distance D C We will find it as follows.

[0070] First, as shown in Figure 10, the magnetized strand has a length from the center 13a of the first recess 13 to the center 14a of the second recess 14 (i.e., magnetic portion length L). C In order to be located in the semicircular region X2 over the range of ), the magnet length L M This is the length that is arranged along at least half of the strands (i.e., the first minimum magnet length L). M1 ) and also, the magnetic part length L C The required length is the length of the magnet L. M The following equation 8 must be satisfied.

[0071] [Formula 8] TIFF0007898676000011.tif40150

[0072] Here, the magnet length L M The second minimum magnet length L M2 (L M =L M2 ) Regarding the configuration, refer to Figure 10, the distance between magnets D M and magnet-magnetic part distance D C We will find it as follows.

[0073] As shown in Figure 10, the magnet length L M However, the second minimum magnet length L M2 In this case, the magnetized strand has a magnetic portion length L C In order to be positioned across the entire half-circular region X2 over the range, the first magnet 11 and the second magnet 12 are each positioned with a second minimum magnet length L M2 It needs to be placed along a common strand of length L. M However, the second minimum magnet length L M2 In this case, the distance between magnets D M The following equation 9 must be satisfied.

[0074] [Formula 9] TIFF0007898676000012.tif22150

[0075] Also, as shown in Figure 10, the magnet length LM However, the second minimum magnet length L M2 Furthermore, the distance D between the magnets M However, the length L R When the distance is a multiple of 2 (2 times in Figure 10), the range in which the magnetized strand is located throughout the entire half-circular region X2 is centered on the center position X3 between the magnets, and the magnetic portion length L C It is within the range.

[0076] Therefore, the magnet length L M However, the second minimum magnet length L M2 Furthermore, the distance D between the magnets M However, the length L R When the distance is a multiple of 2, for the magnetized strand to be located across the entire half-circular region X2, from the center 13a of the first recess 13 to the center 14a of the second recess 14, the magnet-magnetic part distance D is required. C The following equation 10 must be satisfied.

[0077] [Formula 10] TIFF0007898676000013.tif56150

[0078] As a result, the center 5b of the magnetic part 5 is located at the center position X3 between the magnets, and the magnetized strand is located throughout the entire semicircular region X2, from the center 13a of the first recess 13 to the center 14a of the second recess 14. In Figure 10, the position of the Xa-Xa line is from the center position X3 between the magnets to the magnetic part length L. C The position is 1 / 2 of the distance toward the first magnet 11, and the position of the Xb-Xb line is from the center position X3 between the magnets to the magnetic part length L. C The position is 1 / 2 of the way away from the second magnet 12, and the position of the magnetic part 5 (recess 13, 14) is D C =D C1 It is in that position.

[0079] Next, the magnet length L M The second minimum magnet length L M2 With the above configuration, refer to Figures 11 to 13, and consider the distance D between the magnets. M and magnet-magnetic part distance DC We will find it as follows.

[0080] First, as shown in Figures 11 and 12, the magnet length L M However, the second minimum magnet length L M2 Even if the magnetized strand is longer by a predetermined length α than the magnetic part length L C In order to be positioned across the entire half-circular region X2 over the above range, the first magnet 11 and the second magnet 12 are each positioned with a second minimum magnet length L M2 It needs to be placed along a common strand of more than a minute.

[0081] For example, the distance D between magnets M As shown in Figure 11, the length L is greater. R From a distance that is a multiple of 2 (2 times in Figure 11) shorter by a predetermined length α, as shown in Figure 12, the distance L is shorter. R The distance must be longer by a predetermined length α than a distance that is a multiple of 2 (in Figure 12, twice the distance). Therefore, the magnet length L M However, the second minimum magnet length L M2 If the above conditions are met, the distance between magnets D M The following equation 11 must be satisfied.

[0082] [Formula 11] TIFF0007898676000014.tif9150

[0083] This allows the first magnet 11 and the second magnet 12 to have a second minimum magnet length L M2 It is possible to arrange them along a common strand of more than half a minute. Therefore, more than half of the strands can be magnetized, and the magnetized strands can be arranged along a magnetic section of length L. C It can be positioned over the entire semicircular region X2 within the above range. M =L M2 In this case, equation 9 above is obtained.

[0084] Furthermore, in Figure 11, the position of the XIa-XIa line is determined by the magnetic section length L, from the center position X3 between the magnets. CThe position is 1 / 2 of the distance toward the first magnet 11, and the position of the XIb-XIb line is from the center position X3 between the magnets to the magnetic part length L. C The position is 1 / 2 of the way away from the second magnet 12, and the position of the magnetic part 5 (recess 13, 14) is D C =D C1 This is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extension direction D1.

[0085] Furthermore, in Figure 12, the position of the XIIa-XIIa line is determined by the magnetic section length L, from the center position X3 between the magnets. C The position is 1 / 2 of the distance toward the first magnet 11, and the position of the XIIb-XIIb line is from the center position X3 between the magnets to the magnetic part length L. C The position is 1 / 2 of the way away from the second magnet 12, and the position of the magnetic part 5 (recess 13, 14) is D C =D C1 This is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extension direction D1.

[0086] Also, as shown in Figure 13, the magnet length L M However, the second minimum magnet length L M2 It is longer by a predetermined length α than the distance between the magnets D. M However, the length L R When the distance is a multiple of 2 (2 times in Figure 13), the range in which the magnetized strand is located throughout the entire half-circular region X2 is centered on the intermagnet center position X3, and [predetermined length α + magnetic part length L]. C It is within the range of ].

[0087] Therefore, the magnet length L M However, the second minimum magnet length L M2 The above conditions are met, and the distance between the magnets D M However, the length L R When the distance is a multiple of 2, for the magnetized strand to be located across the entire half-circular region X2, from the center 13a of the first recess 13 to the center 14a of the second recess 14, the magnet-magnetic part distance D is required. C The following equation 12 must be satisfied.

[0088] [Formula 12] TIFF0007898676000015.tif71150

[0089] As a result, half of the magnetized strands are located throughout the entire semicircular region X2 (centered on the center position X3 between the magnets [a predetermined length α + magnetic part length L]). C The range of [ ] is located from the center 13a of the first recess 13 to the center 14a of the second recess 14. In Figure 13, the position of the line XIIIa-XIIIa is from the center position X3 between the magnets, [predetermined length α + magnetic part length L C The position is 1 / 2 of the distance toward the first magnet 11, and the position of the XIIIb-XIIIb line is [predetermined length α + magnetic part length L] from the center position X3 between the magnets. C The position is 1 / 2 of the distance toward the second magnet 12, and the position of the magnetic part 5 (recess 13, 14) is D C =D C1 This is the position where the center 5b of the magnetic part 5 and the center position X3 between the magnets coincide in the extension direction D1.

[0090] Also, the magnet length L M However, the second minimum magnet length L M2 If the above conditions are met, the distance between magnets D M is longer L R The distance is not only a multiple of 2, but also a distance that satisfies equation 11 above. In this case, the distance between magnets D M Longer L R Compared to a configuration where the distance between magnets is a multiple of 2, the distance D between magnets M If the configuration satisfies the above equation 11, the length of the extension direction D1 in which the entire half-circumferential region X2 is magnetized is the distance between the magnets D M And, longer L R The distances that are multiples of 2 and the difference between them (|D M -2N×L R It becomes shorter by the amount of |).

[0091] Therefore, the magnet length L M However, the second minimum magnet length L M2 The above conditions are met, and the distance between the magnets D MHowever, if the above equation 11 is satisfied, in order for the magnetized strand to be located throughout the entire semicircular region X2, from the center 13a of the first recess 13 to the center 14a of the second recess 14, the magnet-magnetic part distance D C The following equation 13 must be satisfied.

[0092] [Formula 13] TIFF0007898676000016.tif74150

[0093] Thus, in the second embodiment, by satisfying formulas 8, 11, and 13, more than half of the magnetized strands are located throughout the entire semicircular region X2, from the center 13a of the first recess 13 to the center 14a of the second recess 14. M =L M2 And D M = 2N × L R In this case, the above equation 10 becomes, and D M = 2N × L R In this case, the above equation 12 is obtained.

[0094] [1] Based on the above, the elevator rope tester 1 is as in the first embodiment of this model, In order to magnetize the stranded rope X1, a first magnet 11 and a second magnet 12 are arranged apart in the extending direction D1 of the rope X1, A magnetic unit 5 collects the magnetic flux leaking from the rope X1, The system includes a detection unit 6 that detects the magnetic flux passing through the inside of the magnetic part 5, Each of the first magnet 11 and the second magnet 12 is positioned on the first radial direction D2a side of the rope X1, The magnetic portion 5 includes a first recess 13 and a second recess 14 that are arranged along a region X2 that covers at least half the circumference of the rope X1, centered on a position X2a in the first radial direction D2a on the outer surface of the rope X1. The first recess 13 and the second recess 14 are arranged apart in the extending direction D1 and are positioned between the first magnet 11 and the second magnet 12. The length L of the extension direction D1 of the first magnet 11 and the second magnet 12, respectively. M The following equation A (in this embodiment, equations 1 and 2) is satisfied, The distance D between the outer end 11a of the first magnet 11 and the inner end 12b of the second magnet 12 in the extending direction D1 M This satisfies the following equation B (equation 5 in this embodiment): This configuration is preferable. [Formula A] TIFF0007898676000017.tif74150 Here, L R This is the length of the rope X1, and N S This is the number of strands in the aforementioned rope X1. [Formula B] TIFF0007898676000018.tif12150 Here, N is a natural number.

[0095] With this configuration, since equations A and B are satisfied, the first magnet 11 and the second magnet 12 are positioned on more than half of the common strands. As a result, more than half of the common strands on which the first magnet 11 and the second magnet 12 are positioned are magnetized. Therefore, more than half of the strands can be magnetized.

[0096] [2] Furthermore, in the elevator rope tester 1 described in [1] above, as in the first embodiment of this model, The distance D between the inner end 11b of the first magnet 11 and the center 5b between the first recess 13 and the second recess 14 in the extension direction D1. C This satisfies the following equation C (equation 7 in this embodiment): This configuration is preferable. [Formula C] TIFF0007898676000019.tif76150 Here, L CThis is the distance between the center 13a of the first recess 13 and the center 14a of the second recess 14 in the extension direction D1.

[0097] With this configuration, since equation C is satisfied, the magnetized strand is located at at least a portion of the area X2 that covers half the circumference of the rope X1 in which the first recess 13 and the second recess 14 are located, at least in the area between the center 13a of the first recess 13 and the center 14a of the second recess 14.

[0098] [3] Furthermore, in the elevator rope tester 1 described in [2] above, as in the second embodiment of this model, The length L of the extension direction D1 of the first magnet 11 and the second magnet 12, respectively. M The following equation D (equation 8 in this embodiment) is satisfied, The distance D between the outer end 11a of the first magnet 11 and the inner end 12b of the second magnet 12 in the extending direction D1 M The following equation E (equation 11 in this embodiment) is satisfied, The distance D between the inner end 11b of the first magnet 11 and the center 5b between the first recess 13 and the second recess 14 in the extension direction D1. C This satisfies the following equation F (equation 13 in this embodiment): This configuration is preferable. [Formula D] TIFF0007898676000020.tif43150[Formula E] TIFF0007898676000021.tif10150[Formula F] TIFF0007898676000022.tif74150

[0099] With this configuration, since equations D and E are satisfied, the first magnet 11 and the second magnet 12 have a second minimum magnet length L M2 The magnetized strands are positioned along the common strand for more than 1 minute. CThe above-mentioned areas are located throughout the entire region X2, which is half the circumference of the rope X1, where the first recess 13 and the second recess 14 are positioned.

[0100] Furthermore, since the above equation F is satisfied, the magnetized strand is located throughout the entire half-circle region X2 of the rope X1 in which the first recess 13 and the second recess 14 are located, from the center 13a of the first recess 13 to the center 14a of the second recess 14.

[0101] It should be noted that the elevator rope tester 1 is not limited to the configuration of the embodiment described above, nor is it limited to the effects and benefits described above. Furthermore, it goes without saying that the elevator rope tester 1 can be modified in various ways without departing from the spirit of the present invention. For example, one or more of the configurations and methods described below may be arbitrarily selected and adopted in the configurations and methods of the embodiment described above.

[0102] (a) For example, in the elevator rope tester 1 according to the above embodiment, the natural number N in equations B (equations 3, 5, and 7) and E (equations 9, 11, and 13) is set to "1". However, the elevator rope tester 1 is not limited to this configuration. For example, the natural number N in equations B (equations 3, 5, and 7) and E (equations 9, 11, and 13) may be 2 or greater.

[0103] Furthermore, it is preferable that the natural number N in equations B (equations 3, 5, and 7) and E (equations 9, 11, and 13) is "1". With such a configuration, the second magnet 12 is longer than the first magnet 11 by a length L R The magnetic part 5 is positioned at a distance of approximately twice the distance from the first magnet 11 (second magnet 12), and is located at a length L greater than the first magnet 11 (second magnet 12). R It is positioned at a distance of approximately 1x. This makes it possible to suppress an increase in the extension dimension D1 of the elevator rope tester 1, for example.

[0104] (b) For example, the elevator rope tester 1 according to the above embodiment has a configuration that satisfies formulas A, B, and C. However, the elevator rope tester 1 is not limited to such a configuration. For example, the elevator rope tester 1 may have a configuration that satisfies formulas A and B, but does not satisfy formula C.

[0105] (c) For example, the elevator rope tester 1 according to the above embodiment has a configuration that satisfies formulas D, E, and F. However, the elevator rope tester 1 is not limited to such a configuration. For example, the elevator rope tester 1 may have a configuration that satisfies formulas A, B, and C, but does not satisfy formulas D, E, and F.

[0106] (d) For example, the order in which each step, such as the operation, procedure, step, and stage, of the method and apparatus shown in the claims, specification, and drawings can be performed in any order, as long as the result of the previous step is not used in the later step. For example, even if "first," "next," etc. are used for convenience in the explanation, it does not mean that the steps must be performed in that order. [Explanation of symbols]

[0107] 1...Elevator rope tester, 2...Insertion groove, 2a...Groove side, 2b...Groove bottom, 2c...Guiding part, 3...Gripping part, 4...Magnification part, 4a...Magnetic path part, 5...Magnetic part, 5a...Connection part, 5b...Center, 6...Detection part, 7...Non-magnetic part, 11...First magnet, 11a...Outer end, 11b...Inner end, 12...Second magnet, 12a...Outer end, 12b...Inner end, 13...First recess, 13a...Center, 14...Second recess, 14a...Center, 15...Concave plane, 16...Concave curved surface, D1...Extension direction (first direction, groove length direction), D2...Radial direction (second direction, groove depth direction), D2a...First radial direction, D3...Radial direction (third direction, groove width direction), D C ...Magnet-magnetic part distance, D M ...distance between magnets, L C ...Magnetic section length, L M ...magnet length, L R...length, X1...elevator rope, X2...half-circle area, X2a...half-circle center position, X3...center position between magnets

Claims

1. To magnetize a stranded rope, a first magnet and a second magnet are arranged apart in the direction of extension of the rope, A magnetic unit that collects magnetic flux leaking from the aforementioned rope, The system includes a detection unit for detecting the magnetic flux passing through the inside of the magnetic part, The first magnet and the second magnet are each positioned on the first radial side of the rope with respect to the rope. The magnetic portion includes a first recess and a second recess that are arranged along a region of at least half the circumference of the rope, centered on a first radial position on the outer surface of the rope, The first recess and the second recess are arranged apart in the extension direction and are positioned between the first magnet and the second magnet. The length L of the extension direction of each of the first magnet and the second magnet Ｍ It satisfies the following equation A, The distance D between the outer end of the first magnet and the inner end of the second magnet in the extending direction. Ｍ This is an elevator rope tester that satisfies the following equation B. [Formula A] Here, L Ｒ This is the length of the aforementioned rope, N Ｓ This is the number of strands in the aforementioned rope. [Formula B] Here, N is a natural number.

2. The distance D in the extending direction is the distance between the inner end of the first magnet and the center between the first recess and the second recess. Ｃ The elevator rope tester according to claim 1, wherein the following formula C is satisfied. [Formula C] Here, L Ｃ This is the distance between the center of the first recess and the center of the second recess in the extension direction.

3. The length L of the extension direction of each of the first magnet and the second magnet Ｍ The following equation D is satisfied, The distance D between the outer end of the first magnet and the inner end of the second magnet in the extending direction. Ｍ It satisfies the following equation E, The distance D between the inner end of the first magnet and the center between the first recess and the second recess in the extending direction Ｃ The elevator rope tester according to claim 2, which satisfies the following formula F. [Formula D] [Formula E] [Formula F]

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