Wire Rope Flaw Detection Device

Abstract

To provide a detection device for wire rope flaw which enables reduction of the frequency of maintenance.SOLUTION: The detection device for wire rope flaw comprises: a magnetization unit which has a pair of magnetizers adjacent to a wire rope and apart from each other and forms a magnetic flux in a portion, in the length direction, of the wire rope by the pair of magnetizers; a first detection unit which is located between the pair of magnetizers and detects, by the magnetic flux formed by the magnetization unit, a magnetic leakage flux leaking from a flaw portion of the wire rope; and a first cover unit which has a first adjacent surface covering the pair of magnetizers of the magnetization unit and the first detection unit and a semicircular first groove where the first adjacent surface is recessed to the pair of magnetizers side from one of the pair of magnetizers to the other and the radius of curvature larger than the radius of the wire rope, wherein the first cover unit is located along the outer periphery of the wire rope, with the inner surface of the first detection groove separated from the outer periphery.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a flaw detection device for a wire rope.

Background Art

[0002] Patent Document 1 discloses a flaw detection device for a wire rope. The flaw detection device is permanently installed in the machine room of an elevator. The flaw detection device can detect a flaw generated in the main rope of the elevator by bringing a detection unit into contact with the main rope.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flaw detection device described in Patent Document 1, the detection unit of the flaw detection device that comes into contact with the wire rope can wear out. Therefore, it is necessary to frequently perform maintenance on the flaw detection device.

[0005] The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a flaw detection device for a wire rope that can suppress the frequency of maintenance.

Means for Solving the Problems

[0006] The flaw detection device for a wire rope according to the present disclosure has a pair of magnetic elements that are adjacent to and separated from each other with respect to the wire rope, a magnetization unit that forms a magnetic flux in a part of the length direction of the wire rope by the pair of magnetic elements, a first detection unit that is disposed between the pair of magnetic elements and detects a leakage magnetic flux that leaks from a damaged portion of the wire rope due to the magnetic flux formed by the magnetization unit, a first adjacent surface that covers the pair of magnetic elements of the magnetization unit and the first detection unit, and a first detection groove having a semi-circular shape with a radius of curvature larger than the radius of the wire rope, in which the first adjacent surface is recessed toward the pair of magnetic elements from one of the pair of magnetic elements to the other, and a first cover portion disposed such that the inner surface of the first detection groove is along the outer peripheral surface of the wire rope while being separated from the outer peripheral surface of the wire rope. , the magnetization portion has ferromagnetic properties and includes one of a pair of gaskets arranged along the first detection groove of the first cover portion and having ferromagnetic properties, the other of the pair of gaskets arranged along the first detection groove of the first cover portion and having ferromagnetic properties, a magnet arranged in a direction to form a magnetic flux facing the length direction of the wire rope, and a cross-linking body having ferromagnetic properties and arranged to contact the magnet on a surface facing the length direction of the wire rope. One surface of the one of the pair of gaskets facing the length direction of the wire rope contacts one surface of the magnet facing the length direction of the wire rope, the other surface of the magnet facing the length direction of the wire rope contacts one end of the cross-linking body, and the surface of the other of the pair of gaskets facing the length direction of the wire rope contacts the other end of the cross-linking body. 。

[0007] The flaw detection device for a wire rope according to the present disclosure has a pair of magnetic elements that are adjacent to and separated from each other with respect to a plurality of wire ropes, a magnetization unit that forms a magnetic flux in a part of the length direction of the plurality of wire ropes by the pair of magnetic elements, a first detection unit that is formed longer than the width in which the plurality of wire ropes are arranged side by side, is disposed between the pair of magnetic elements, and detects a leakage magnetic flux that leaks from a damaged portion of any one of the plurality of wire ropes due to the magnetic flux formed by the magnetization unit, a first adjacent surface that covers the pair of magnetic elements of the magnetization unit and the first detection unit, and a plurality of first detection grooves having a semi-circular shape with a radius of curvature larger than the radius of the plurality of wire ropes, in which the first adjacent surface is recessed toward the pair of magnetic elements from one of the pair of magnetic elements to the other, and a first cover portion disposed such that the inner surfaces of the plurality of first detection grooves are along the outer peripheral surfaces of the plurality of wire ropes while being separated from the outer peripheral surfaces of the plurality of wire ropes. , the magnetization portion has ferromagnetic properties and includes one of a pair of gaskets arranged along the plurality of first detection grooves of the first cover portion and having ferromagnetic properties, the other of the pair of gaskets arranged along the plurality of first detection grooves of the first cover portion and having ferromagnetic properties, a magnet arranged in a direction to form a magnetic flux facing the length direction of the plurality of wire ropes, and a cross-linking body having ferromagnetic properties and arranged to contact the magnet on a surface facing the length direction of the plurality of wire ropes. One surface of the one of the pair of gaskets facing the length direction of the plurality of wire ropes contacts one surface of the magnet facing the length direction of the plurality of wire ropes, the other surface of the magnet facing the length direction of the plurality of wire ropes contacts one end of the cross-linking body, and the surface of the other of the pair of gaskets facing the length direction of the plurality of wire ropes contacts the other end of the cross-linking body. 。 In addition, the flaw detection device for a wire rope according to the present disclosure has a pair of magnetic elements spaced apart from each other adjacent to a plurality of wire ropes, and a magnetization unit that forms a magnetic flux in a part of the longitudinal direction of the plurality of wire ropes by the pair of magnetic elements; a first detection unit that is formed longer than the width in which the plurality of wire ropes are arranged side by side, is disposed between the pair of magnetic elements, and detects leakage magnetic flux leaking from a damaged part of any one of the plurality of wire ropes by the magnetic flux formed by the magnetization unit; a first adjacent surface that covers the pair of magnetic elements of the magnetization unit and the first detection unit; and a plurality of first detection grooves having a semi-circular shape with a radius of curvature larger than the radius of the plurality of wire ropes, in which the first adjacent surface is recessed toward the side of the pair of magnetic elements from one of the pair of magnetic elements to the other. Inner surfaces of the plurality of first detection grooves are respectively arranged along the outer peripheral surfaces of the plurality of wire ropes in a state of being separated from the outer peripheral surfaces of the plurality of wire ropes, and a first cover part is provided. The first detection unit is formed longer than the width in which the plurality of wire ropes are arranged side by side, has a plurality of spiral coils printed thereon, and has a first flexible substrate provided on the first adjacent surface of the first cover part in a state of being bent along the plurality of first detection grooves. The plurality of coils are respectively arranged to face the plurality of first detection grooves.

Advantages of the Invention

[0008] According to the present disclosure, the flaw detection device is disposed in a state of being separated from the outer peripheral surface of the wire rope. Therefore, the frequency of maintenance can be reduced.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0010] A mode for carrying out the present disclosure will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals. The redundant description of such parts will be appropriately simplified or omitted.

[0011] Embodiment 1. FIG. 1 is a diagram showing a flaw detection device for a wire rope in Embodiment 1.

[0012] In FIG. 1, a plurality of wire ropes 1 are main ropes for suspending an elevator car. Each of the plurality of wire ropes 1 is composed of twisted metal wires (not shown). The plurality of wire ropes 1 are arranged parallel to each other. In the range shown in FIG. 1, the plurality of wire ropes 1 are arranged in the arrangement direction on the same plane.

[0013] The flaw detection device 2 is a device for detecting flaws generated in the plurality of wire ropes 1. The flaw detection device 2 is permanently installed inside a machine room of an elevator (not shown). Although not shown, specifically, the flaw detection device 2 is provided around the plurality of wire ropes 1 from the drum of the elevator hoisting machine to the car in the machine room. The flaw detection device 2 is provided so as not to contact the plurality of wire ropes 1.

[0014] The flaw detection device 2 includes a first unit 3 and a second unit 4.

[0015] The first unit 3 is arranged on one side of the plane on which the plurality of wire ropes 1 are arranged. The first unit 3 is arranged so as not to contact the plurality of wire ropes 1. The second unit 4 is arranged on the other side of the plane on which the plurality of wire ropes 1 are arranged. The second unit 4 is arranged so as not to contact the plurality of wire ropes 1. The first unit 3 and the second unit 4 form a plurality of detection spaces 2a through which the plurality of wire ropes 1 respectively pass. Each of the plurality of detection spaces 2a has a cylindrical shape with a radius larger than the radius of the wire rope 1.

[0016] When the flaw detection device 2 is installed as shown in FIG. 1, the directions in each case are described as follows. The length direction of the wire rope 1 is defined as the length direction X. The direction in which a plurality of wire ropes 1 are arranged is defined as the arrangement direction Y. The direction from the first unit 3 to the plurality of wire ropes 1 is defined as the vertical direction Z.

[0017] When the elevator is in operation, each of the plurality of wire ropes 1 moves in the length direction X inside the plurality of detection spaces 2a. At this time, each of the plurality of wire ropes 1 moves inside the detection space 2a without contacting the first unit 3 and the second unit 4. For example, if there is a flaw due to a broken wire in one of the plurality of wire ropes 1, the flaw detection device 2 uses the leakage magnetic flux detection method to detect the flaw generated in the wire rope 1 passing through the inside of the detection space 2a. The flaw detection device 2 transmits the detection result information to an output device (not shown). For example, the output device notifies the elevator maintenance personnel of the received detection result. The maintenance personnel who receive the notification perform an inspection of the wire rope 1.

[0018] Next, the first unit 3 will be described with reference to FIG. 2. FIG. 2 is an exploded perspective view of the first unit of the wire rope flaw detection device according to Embodiment 1.

[0019] As shown in FIG. 2, the first unit 3 includes a first cover portion 5, a first detection portion 6, and a first magnetization portion 7.

[0020] The first cover portion 5 is formed by bending a thin plate of a paramagnetic material. The first cover portion 5 includes a first adjacent surface 8 and a pair of first side surfaces 9.

[0021] When the flaw detection device 2 is arranged around the wire rope 1, the first adjacent surface 8 is adjacent to each of the plurality of wire ropes 1. The width of the first adjacent surface 8 is longer than the width in which the plurality of wire ropes 1 are arranged. The first adjacent surface 8 has a plurality of first detection grooves 10 and a first slit 11.

[0022] The number of the plurality of first detection grooves 10 is equal to the number of the plurality of wire ropes 1. The plurality of first detection grooves 10 each have the same shape. The first detection grooves 10 are provided along the length direction X on the first adjacent surface 8. In a cross section perpendicular to the length direction X, the first detection grooves 10 are formed in a semi-circular shape. The radius of curvature of the semi-circular shape of the first detection grooves 10 is larger than the radius of the wire ropes 1.

[0023] The first slit 11 is a hole penetrating the first adjacent surface 8. The first slit 11 is provided at one end of the first adjacent surface 8 in the arrangement direction Y.

[0024] One of the pair of first lateral surfaces 9 extends from one end of the first adjacent surface 8 in the arrangement direction Y in the direction in which the first detection groove 10 is recessed. The other of the pair of first lateral surfaces 9 extends from the other end of the first adjacent surface 8 in the arrangement direction Y in the direction in which the first detection groove 10 is recessed. The pair of first lateral surfaces 9 respectively constitute the side surfaces of the first unit 3.

[0025] For example, the first detection portion 6 is composed of a coil of a copper wire wound in an elongated elliptical shape, a resin formed around the coil, and a terminal 12. The first detection portion 6 is provided on the side opposite to the wire rope 1 with respect to the first adjacent surface 8 of the first cover portion 5. The first detection portion 6 is attached along the first adjacent surface 8 such that the major axis direction of the ellipse faces the arrangement direction Y. The first detection portion 6 curves along the plurality of first detection grooves 10. The resin constituting the first detection portion 6 is formed by an impregnation process of filling around the coil with resin. The resin suppresses the winding of the coil from being disordered.

[0026] For example, the terminal 12 is a copper wire extending from the coil. One end of the terminal 12 is led out to the side opposite to the coil on the first adjacent surface 8 through the first slit 11 of the first cover portion 5.

[0027] The first magnetization portion 7 includes a pair of magnets 13, a back yoke 14, and a pair of gaskets 15.

[0028] Each of the pair of magnets 13 is formed in a rectangular parallelepiped shape. The long side of each of the pair of magnets 13 is longer than the width in which a plurality of wire ropes 1 (not shown in FIG. 2) are arranged in the arrangement direction Y. Each of the pair of magnets 13 is a magnet magnetized in a direction perpendicular to the long side.

[0029] Each of the pair of magnets 13 is provided as a pair of magnetic elements on the side where the first detection groove 10 is recessed with respect to the first adjacent surface 8 of the first cover portion 5. In the projection plane onto the plane composed of the length direction X and the arrangement direction Y, the pair of magnets 13 are respectively arranged on both sides of the first detection portion 6 in the length direction X. The pair of magnets 13 are arranged parallel to each other. The long side direction of each of the pair of magnets 13 faces the arrangement direction Y. On one of the pair of magnets 13, the surface indicating the S pole faces the side of the plurality of wire ropes 1. On one of the pair of magnets 13, the surface indicating the N pole faces the side opposite to the plurality of wire ropes 1. On the other of the pair of magnets 13, the surface indicating the N pole faces the side of the plurality of wire ropes 1. On the other of the pair of magnets 13, the surface indicating the S pole faces the side opposite to the plurality of wire ropes 1.

[0030] The back yoke 14 is a ferromagnetic metal. The back yoke 14 is formed in a rectangular parallelepiped shape. In the arrangement direction Y, the width of the back yoke 14 is equal to the length of the long side of the magnet 13. In the vertical direction Z, the height of the back yoke 14 is determined corresponding to the total cross-sectional area of the plurality of wire ropes 1. Specifically, the value of the height of the back yoke 14 is a value such that the product of the width and height of the back yoke 14 exceeds the sum of the cross-sectional areas of the plurality of wire ropes 1. The dimension of the back yoke 14 in the length direction X is a length equal to or greater than the sum of twice the length of the magnet 13 in the length direction X and the length of the minor axis of the first detection portion 6.

[0031] The back yoke 14 is disposed on the side opposite to the first cover portion 5 with respect to the pair of magnets 13. On the surface of the back yoke 14 on the side of the first cover portion 5, the back yoke 14 is in contact with each of the pair of magnets 13. In the longitudinal direction X, one end face of the back yoke 14 is aligned with the side face of one side of the pair of magnets 13. In the longitudinal direction X, the other end face of the back yoke 14 is aligned with the side face of the other side of the pair of magnets 13.

[0032] One of the pair of gaskets 15 is disposed between the first adjacent surface 8 of the first cover portion 5 and one of the pair of magnets 13. The other of the pair of gaskets 15 is disposed between the first adjacent surface 8 of the first cover portion 5 and the other of the pair of magnets 13. In the arrangement direction Y, the length of each of the pair of gaskets 15 is equal to the interval between the pair of first lateral surfaces 9. In each of the pair of gaskets 15, the shape of the surface facing the magnet 13 is equal to the shape of the surface of the opposing magnet 13. In each of the pair of gaskets 15, the surface facing the first cover portion 5 has a shape along the undulating shape of the plurality of first detection grooves 10 formed in the first adjacent surface 8.

[0033] In the state where the first unit 3 is assembled, one side surface facing the longitudinal direction X of the first unit 3 has the first cover portion 5, the back yoke 14, one of the pair of magnets 13, and one of the pair of gaskets 15 arranged without a gap. At this time, one of the pair of gaskets 15 fills the gap formed by the first cover portion 5 and the pair of magnets 13. The other side surface facing the longitudinal direction X of the first unit 3 has the first cover portion 5, the back yoke 14, the other of the pair of magnets 13, and the other of the pair of gaskets 15 arranged without a gap. Both side surfaces of the first unit 3 in the arrangement direction Y are each composed of a pair of first lateral surfaces 9. The surface of the first unit 3 facing the wire rope 1 is composed of the first adjacent surface 8. The surface of the first unit 3 facing the opposite side of the wire rope 1 is composed of the back yoke 14. That is, in the first unit 3, all surfaces are configured without a gap.

[0034] Next, the second unit 4 will be described with reference to FIG. 3. FIG. 3 is an exploded perspective view of the second unit of the wire rope flaw detector according to Embodiment 1.

[0035] As shown in FIG. 3, the second unit 4 includes a second cover portion 16, a second detection portion 17, a second magnetization portion 18, a signal processing board 19, and a board case 20.

[0036] The second cover portion 16 has the same configuration as the first cover portion 5. Specifically, the second cover portion 16 includes a second adjacent surface 21 and a pair of second lateral surfaces 22 that respectively correspond to the first adjacent surface 8 and the pair of first lateral surfaces 9. The second adjacent surface 21 has a plurality of second detection grooves 23 and a second slit 24 that respectively correspond to the plurality of first detection grooves 10 and the first slit 11.

[0037] The second detection portion 17 has the same configuration as the first detection portion 6.

[0038] The second magnetization portion 18 has the same configuration as the first magnetization portion 7, and includes a pair of magnets 25, a back yoke 26, and a pair of gaskets 27.

[0039] The signal processing board 19 is a board on which an electronic circuit is mounted. Although not shown, the signal processing board 19 has, as an electronic circuit, a preamplifier, a low-pass filter, an A / D converter, a CPU, a memory, etc. The signal processing board 19 is provided on the side opposite to the pair of magnets 25 with respect to the back yoke 26.

[0040] The board case 20 is a rectangular parallelepiped box formed by bending a thin plate. The board case 20 has five rectangular surfaces and one opening surface. The opening surface of the board case 20 has substantially the same shape as the surface that contacts the pair of magnets 25 of the back yoke 26. The depth from the opening of the board case 20 is a depth capable of storing the signal processing board 19.

[0041] The second cover portion 16, the second detection portion 17, and the second magnetization portion 18 of the second unit 4 are assembled in the same manner as the first unit 3. However, one end of the terminal 12 of the second detection portion 17 is not passed through the second slit 24 of the second cover portion 16, but is passed through to the side of the back yoke 26 opposite to the second detection portion 17. The substrate case 20 covers the second unit 4 from the side of the back yoke 26 at the opening. The signal processing substrate 19 is fixed between the back yoke 26 and the substrate case 20. Specifically, the back yoke 26 and the substrate case 20 are fixed to each other by a support column provided therebetween. The signal processing substrate 19 is arranged between the back yoke 26 and the substrate case 20 by being fixed to the support column. One end of the terminal 12 of the second detection portion 17 is connected to the signal processing substrate 19.

[0042] In the state where the second unit 4 is assembled, the surface facing away from the wire rope 1 of the second unit 4 is constituted by the substrate case 20. Both side surfaces of the second unit 4 in the arrangement direction Y are constituted by each of a pair of second lateral surfaces 22 of the second cover portion 16 and the substrate case 20.

[0043] Next, a method of attaching the flaw detector 2 to the periphery of the wire rope 1 will be described with reference to FIG. 4. FIG. 4 is an exploded perspective view of the wire rope flaw detector in the first embodiment.

[0044] As shown in FIG. 4, when the flaw detector 2 is attached, the first unit 3 and the second unit 4 are arranged to face each other. At this time, the first adjacent surface 8 of the first unit 3 faces the second adjacent surface 21 of the second unit 4. Although not shown in FIG. 4, a plurality of first detection grooves 10 of the first unit 3 and a plurality of second detection grooves 23 of the second unit 4 respectively form a plurality of cylindrical detection spaces 2a. At this time, the plurality of wire ropes 1 respectively pass through the centers of the plurality of detection spaces 2a. At this time, the first unit 3 is arranged such that the inner surfaces of the plurality of first detection grooves 10 respectively follow the outer peripheral surfaces of the plurality of wire ropes 1. The second unit 4 is arranged such that the inner surfaces of the plurality of second detection grooves 23 respectively follow the outer peripheral surfaces of the plurality of wire ropes 1.

[0045] The pair of magnets 13 in the first unit 3 has the same magnetic poles facing the pair of magnets 25 in the second unit 4. Specifically, the S pole on one of the pair of magnets 13 in the first unit 3 faces the S pole on one of the pair of magnets 25 in the second unit 4.

[0046] The first slit 11 of the first unit 3 faces the second slit 24 of the second unit 4. The terminal 12 of the first detection unit 6 (not shown in FIG. 4) is inserted into the second unit 4 through the second slit 24 of the second unit 4. The terminal 12 of the first detection unit 6 is connected to a signal processing board 19 (not shown in FIG. 4) inside the second unit 4.

[0047] Next, with reference to FIG. 5, the principle by which the flaw detection device 2 detects a flaw in the wire rope 1 will be described. FIG. 5 is a diagram showing an overview of the magnetic flux generated by the wire rope flaw detection device in Embodiment 1. Note that only the magnetic flux generated by the first unit 3 is shown in FIG. 5.

[0048] As shown in FIG. 5, the first magnetization unit 7 of the first unit 3 forms magnetic flux in a part of the length direction X. Specifically, in the other of the pair of magnets 13, the magnetic flux emerging from the N pole penetrates into the wire rope 1. After passing through the inside of the wire rope 1, the magnetic flux exits from the wire rope 1 at a portion facing the S pole of one of the pair of magnets 13. After entering the S pole of one of the pair of magnets 13, the magnetic flux enters the back yoke 14 from the N pole. After passing through the inside of the back yoke 14, the magnetic flux enters the S pole of the other of the pair of magnets 13. That is, the first magnetization unit 7 forms a magnetic flux that loops inside the other of the pair of magnets 13, a part of the length direction X of the wire rope 1, one of the pair of magnets 13, and the back yoke 14.

[0049] In the wire rope 1, when the magnetic flux passes through a damaged part such as a broken strand, the magnetic flux leaks from the damaged part as leakage magnetic flux. When the wire rope 1 moves inside the detection space in this state, the leakage magnetic flux passes through the inside of the coil of the first detection unit 6. Specifically, when the damaged part enters the inside of the detection space and when the damaged part exits the detection space, the leakage magnetic flux M changes the magnetic flux density inside the coil. In this case, an induced electromotive force is generated in the coil due to the change in the magnetic flux density. The terminal 12 of the coil inputs the induced current generated by the induced electromotive force to the signal processing board 19 as an electrical signal.

[0050] The signal processing board 19 can detect damage to the wire rope 1 by monitoring the electrical signal input from the terminal 12. Specifically, in the signal processing board 19, the amplifier circuit amplifies the weak electrical signal input from the terminal 12. Then, the amplified electrical signal passes through a low-pass filter to suppress aliasing noise and is then input to an A / D converter. The A / D converter converts the electrical signal, which is an analog signal, into a digital signal. The converted digital signal is applied with frequency filters such as a comb filter, a low-pass filter, a high-pass filter, a band-pass filter, and a band-elimination filter. At this time, the signal processing board 19 removes the noise components among the various frequency components included in the digital signal by various frequency filters. The signal processing board 19 extracts the component of the flaw detection signal corresponding to the induced current due to the leakage magnetic flux from the digital signal by removing the noise components.

[0051] The signal processing board 19 compares the value of the component of the flaw detection signal with a reference value. When the value of the component of the flaw detection signal exceeds the reference value, the signal processing board 19 detects that there is a flaw in the wire rope 1.

[0052] Although not shown, the signal processing board 19 detects that there is a flaw in the wire rope 1 based on the electrical signal from the second detection unit 17 in the same manner as the electrical signal from the first detection unit 6.

[0053] According to the first embodiment described above, the flaw detector 2 includes a first magnetization unit 7, a first detection unit 6, and a first cover unit 5. The first cover unit 5 is arranged such that the inner surface of the first detection groove 10 is along the outer peripheral surface of the wire rope 1 in a state separated from the wire rope 1. The flaw detector 2 inspects for flaws in the wire rope 1 without contacting the wire rope 1. For this reason, it is possible to suppress wear of the first cover unit 5 which is the detection surface of the flaw detector 2. As a result, the frequency of maintenance can be suppressed. Further, the flaw detector 2 can be permanently installed in the machine room of the elevator by being fixed around the wire rope 1. For this reason, a mechanism for driving the flaw detector 2 and the like is unnecessary. As a result, the frequency of maintenance required for the mechanism for permanent installation can be suppressed.

[0054] In a conventional flaw detector that performs flaw detection by a method in which the detection unit and the wire rope are in contact, when the flatness of the surface where the detection unit and the wire rope are in contact is low, the contact state between the slid wire rope and the detection surface is unstable. In this case, the output of the electrical signal from the flaw detector becomes unstable. Further, in a conventional flaw detector, when the flatness of the surface where the detection unit and the wire rope are in contact is low, the contact pressure may concentrate on a specific location among the locations where the wire rope and the detection unit are in contact. In this case, the wire rope is likely to be damaged due to wear. Compared with the conventional flaw detector, the flaw detector 2 of the present embodiment does not require a high flatness for the detection unit. For this reason, the flaw detector 2 can be manufactured at a lower cost. Further, since it is not necessary to change the curved surface of the detection unit according to the thickness of the wire rope 1, it is possible to cope with wire ropes of various thicknesses using the flaw detector 2 of the same design.

[0055] Further, the flaw detection device 2 includes a second detection unit 17 and a second cover unit 16 that are disposed on the side opposite to the first unit 3 of the wire rope 1. The second detection unit 17 can detect a flaw existing on the side opposite to the first detection unit 6 of the wire rope 1 in a state where the second cover unit 16 does not contact the wire rope 1. Therefore, the flaw detection device 2 can simultaneously perform flaw inspection over the entire circumferential direction of the wire rope. Further, since the distance between the wire rope 1 and the detection unit of the flaw detection device 2 is large, the magnetic flux density passing through the detection unit is lower than that in the case of performing flaw inspection while contacting the wire rope 1. By performing flaw inspection over the entire circumferential direction of the wire rope 1, the flaw detection device 2 can suppress a decrease in flaw detection accuracy even in a state where the magnetic flux density passing through the detection unit is low.

[0056] Further, the flaw detection device 2 has a plurality of detection spaces formed by a plurality of first detection grooves 10 and a plurality of second detection grooves 23. Therefore, the flaw detection device 2 can simultaneously inspect a plurality of wire ropes 1.

[0057] Further, the first magnetization unit 7 of the flaw detection device 2 includes a pair of magnets 13 which are a pair of magnetic poles, a back yoke 14, and a pair of gaskets 15. Each of the pair of gaskets 15 fills a gap formed by the first cover unit 5 and the pair of magnets 13. Therefore, all side surfaces of the flaw detection device 2 can be formed without gaps. As a result, it is possible to prevent dust such as dirt from entering the space where the first detection unit 6 is disposed inside the flaw detection device 2.

[0058] Each of the pair of gaskets 15 may be a resin having rubber-like elasticity. Each of the pair of gaskets 15 may be provided between the first cover unit 5 and the pair of magnets 13 while being strongly pressed against the first cover unit 5. In this case, each of the pair of gaskets 15 deforms in accordance with the shape of the first cover unit 5. Therefore, even when the dimensional accuracy of each of the pair of gaskets 15 is not high, each of the pair of gaskets 15 closely adheres to the pair of first cover units 5 without gaps. As a result, the gasket 15 can be manufactured at low cost.

[0059] Note that each of the pair of gaskets 15 may be a resin mixed with a magnetic material and having a rubber-like elastic force. Therefore, the transmission efficiency of the magnetic flux from the magnet 13 to the wire rope 1 can be improved. In this case, the density of the magnetic flux formed inside the wire rope 1 is improved, and the leakage magnetic flux from the damaged portion of the wire rope 1 can be increased. As a result, the accuracy of the flaw detection device 2 for detecting the damage of the wire rope 1 can be improved.

[0060] Note that the flaw detection device 2 may be configured to include only one of the first magnetization unit 7 and the second magnetization unit 18. That is, in the flaw detection device 2, there may be one magnetization unit. Therefore, the number of expensive magnets used can be reduced, and the flaw detection device 2 can be manufactured at low cost. In addition, the operation of coupling the first unit 3 and the second unit 4 can be performed without considering the direction of the internal magnetic flux. As a result, the workability in the operation of coupling the first unit 3 and the second unit 4 can be improved.

[0061] Note that the flaw detection device 2 may not be permanently installed inside the machine room, but may be installed around the plurality of wire ropes 1 during the inspection of the plurality of wire ropes 1.

[0062] Note that the signal processing board 19 may determine whether the position of the flaw generated in the wire rope 1 is on the side of the first unit 3 or the side of the second unit 4 by comparing the electrical signal received from the first detection unit 6 and the electrical signal received from the second detection unit 17. Specifically, for example, when it is detected that the value of the flaw detection signal component included in the electrical signal from the first detection unit 6 is larger than the value of the flaw detection signal component included in the electrical signal from the second detection unit 17, the signal processing board 19 may determine that a flaw has occurred on the side of the first unit 3 in the wire rope 1.

[0063] Note that the flaw detection device 2 may include a greater number of first detection grooves 10 and second detection grooves 23 than the number of the plurality of wire ropes 1. In this case, the flaw detection device 2 includes a greater number of detection spaces 2a than the number of the plurality of wire ropes 1. For example, a flaw detection device 2 having three detection spaces 2a may be used to inspect two wire ropes 1.

[0064] Embodiment 2. FIG. 6 is a diagram showing a detection unit of a flaw detection device for a wire rope in Embodiment 2. Note that the same reference numerals are given to the same or corresponding parts as those in Embodiment 1, and the description thereof is omitted.

[0065] As shown in FIG. 6, in Embodiment 2, the first detection unit 6 and the second detection unit 17 are constituted by a first flexible substrate 30 having a coiled wiring pattern.

[0066] The first flexible substrate 30 is a printed wiring board in which a wiring pattern 31a is printed on a flexible film such as polyimide with copper foil or the like. In the first flexible substrate 30, the film and the wiring pattern can be easily bent. The outer shape of the first flexible substrate 30 is formed substantially the same as that of the first detection unit 6 in Embodiment 1. In the first flexible substrate 30, the wiring pattern 31a of the copper foil is a pattern of a coil in which an ellipse is spirally wound. The first flexible substrate 30 has a terminal 32a.

[0067] The terminal 32a is provided at one end of the first flexible substrate 30 in the longitudinal direction of the first flexible substrate 30. The terminal 32a is connected to the wiring pattern 31a. The terminal 32a is provided so as to be able to output the induced current generated in the wiring pattern 31a as an electrical signal.

[0068] Although not shown in FIG. 6, in the first unit 3, the first flexible substrate 30 is provided on the first adjacent surface 8 in a state of being bent semi-circularly along the depressions of the plurality of first detection grooves 10 in the first cover portion 5. For example, the first flexible substrate 30 is attached to the first adjacent surface 8 by a double-sided tape. At this time, the wiring pattern 31 of the first flexible substrate 30 extends along all the first detection grooves 10. The terminal 32a is connected to a signal processing substrate 19 not shown in FIG. 6. When an induced electromotive force is generated in the wiring pattern 31, the first flexible substrate 30 inputs a corresponding electrical signal to the signal processing substrate 19 via the terminal 32a.

[0069] Although not shown, the second detection unit 17 includes a second flexible substrate. The second flexible substrate has the same configuration as the first flexible substrate 30. In the second unit 4, the second flexible substrate of the second detection unit 17 is provided in the same manner as the first detection unit 6.

[0070] According to the second embodiment described above, the flaw detection device 2 includes the first flexible substrate 30 on which the wiring pattern 31 is formed. The first flexible substrate 30 is attached to the first adjacent surface 8 along the plurality of first detection grooves 10. Therefore, a detection unit having a coil with a complex shape can be manufactured at low cost. Specifically, steps such as the coil forming operation and the impregnation operation performed when manufacturing the coil of the detection unit described in the first embodiment can be reduced. Also, in the process of forming the shape of the coil of the detection unit described in the first embodiment into a U shape, the performance of the coil may decrease during subsequent handling. In the flaw detection device 2 of the second embodiment, it is possible to suppress a decrease in the performance of the coil during manufacturing or the like.

[0071] Further, the flaw detection device 2 includes a second flexible substrate. Therefore, the flaw detection device 2 can simultaneously inspect for flaws over the entire circumferential direction of the wire rope.

[0072] Next, a modified example of the detection unit in the second embodiment will be described with reference to FIG. 7. FIG. 7 is a diagram showing a modified example of the detection unit of the wire rope flaw detector according to the second embodiment.

[0073] As shown in FIG. 7, in the first detection unit 6 and the second detection unit 17 of the modified example, the first flexible substrate 30 includes a plurality of wiring patterns 31b and terminals 32b.

[0074] The wiring pattern 31b is a pattern on which a plurality of spiral coils are printed. In the wiring pattern 31b, the number of the plurality of spiral coils is equal to the number of a plurality of first detection grooves 10 not shown in FIG. 7. The terminal 32b outputs a plurality of electrical signals corresponding to the plurality of spiral coils, respectively.

[0075] Although not shown, in the first unit 3, the wiring pattern 31b is attached to the first adjacent surface 8 such that the plurality of spiral coils respectively correspond to the plurality of first detection grooves 10. The terminal 32b is connected to the signal processing substrate 19. The first flexible substrate 30 inputs a plurality of electrical signals corresponding to the plurality of spiral coils to the signal processing substrate 19, respectively.

[0076] In the second unit 4, the second flexible substrate of the second detection unit 17 is provided in the same manner as the first detection unit 6.

[0077] For example, the signal processing substrate 19 has an electric circuit that generates a component of a damage signal from an electric signal and has a number twice that of the plurality of detection spaces. For example, the signal processing substrate 19 receives inputs of a plurality of electrical signals corresponding to all the spiral coils from the first detection unit 6 and the second detection unit 17. The signal processing substrate 19 compares the components of the plurality of damage signals corresponding to the plurality of electrical signals to identify the damaged wire rope 1 among the plurality of wire ropes 1, and to identify on which side of the first unit 3 and the second unit 4 the damage exists in the damaged wire rope 1.

[0078] According to the modification of Embodiment 2 described above, the first detection unit 6 and the second detection unit 17 have the first flexible substrate 30 on which the wiring patterns 31b of a plurality of spiral coils are printed. When an induced electromotive force due to leakage magnetic flux is generated in any of the coils, the flaw detection device 2 detects that there is a flaw in the wire rope 1 facing the coil. Therefore, when the flaw detection device 2 simultaneously inspects a plurality of wire ropes 1, it can detect on which surface of which wire rope 1 and in which direction a flaw has occurred.

[0079] Embodiment 3. FIG. 8 is a diagram showing a detection unit of a flaw detection device for a wire rope in Embodiment 3. Note that the same reference numerals are given to the same or corresponding parts as those in Embodiment 1 or Embodiment 2, and the description of those parts is omitted.

[0080] As shown in FIG. 8, in Embodiment 3, the flaw detection device 2 includes a third flexible substrate 40. The first detection unit 6 and the second detection unit 17 are constituted by the third flexible substrate 40.

[0081] The long side of the third flexible substrate 40 is longer than twice the length along a plurality of first detection grooves 10 in the arrangement direction of the first adjacent surface 8 of the first cover portion 5. The third flexible substrate 40 includes a wiring pattern 41a, a wiring pattern 41b, and a terminal 42a.

[0082] The wiring pattern 41a is provided on one side of the third flexible substrate 40 rather than at the center of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. The wiring pattern 41a is a pattern of an elliptical spiral coil. For example, the major axis of the wiring pattern 41a is equal to the length along a plurality of first detection grooves 10 in the arrangement direction of the first adjacent surface 8. The wiring pattern 41b is provided on the other side of the third flexible substrate 40 rather than at the center of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. The wiring pattern 41b is the same pattern as the wiring pattern 41a.

[0083] The terminal 42a is provided at one end of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. The terminal 42a is provided so as to be able to output the induced electromotive forces generated in the wiring pattern 41a and the wiring pattern 41b as two electrical signals, respectively.

[0084] Although not shown, in the flaw detector 2, the third flexible substrate 40 is provided from the first unit 3 to the second unit 4. Specifically, in the third flexible substrate 40, the portion on the side where the terminal 42a is provided rather than the center is disposed inside the second unit 4 as the second detection unit 17. The central portion of the third flexible substrate 40 is disposed from the second unit 4 to the first unit 3 through the first slit 11. In the third flexible substrate 40, the portion on the other side rather than the center is disposed inside the first unit 3 as the first detection unit 6. Inside the first unit 3 and inside the second unit 4, the third flexible substrate 40 is attached to the first adjacent surface 8 in the same manner as the first flexible substrate 30 of the first embodiment. The terminal 42a is connected to the signal processing substrate 19.

[0085] For example, the signal processing substrate 19 has two electric circuits that generate components of damage signals from electric signals. For example, the signal processing substrate 19 compares the electric signal corresponding to the wiring pattern 41a and the electric signal corresponding to the wiring pattern 41b to determine whether the position of the flaw generated in the wire rope 1 is on the side of the first unit 3 or the side of the second unit 4.

[0086] According to the third embodiment described above, the flaw detector 2 has the third flexible substrate 40. The third flexible substrate 40 is disposed across the first detection unit 6 and the second detection unit 17. Therefore, the number of components for creating the flaw detector 2 can be reduced as compared with the case where flexible substrates are provided for the first detection unit 6 and the second detection unit 17, respectively.

[0087] Next, a first modification of the detection unit in the third embodiment will be described with reference to FIG. 9. FIG. 9 is a diagram showing a first modification of the detection unit of the wire rope flaw detection device according to the third embodiment.

[0088] As shown in FIG. 9, in the first modification of the third embodiment, the third flexible substrate 40 includes a wiring pattern 41c instead of the wiring patterns 41a and 41b. The third flexible substrate 40 also includes a terminal 42b.

[0089] The wiring pattern 41c is an elliptical spiral coil-shaped pattern. The wiring pattern 41c is provided from one side to the other side of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40.

[0090] The terminal 42b is provided so as to be able to output the induced electromotive force generated in the wiring pattern 41c as an electrical signal.

[0091] Although not shown, in the flaw detection device 2, the third flexible substrate 40 is provided in the same manner as in the third embodiment. The signal processing substrate 19 has one electric circuit that generates a damaged signal component from an electric signal. The signal processing substrate 19 detects the induced current generated in the wiring pattern 41c.

[0092] According to the first modification of the third embodiment described above, the flaw detection device 2 has a third flexible substrate 40 on which a wiring pattern 41c forming a spiral coil from one end to the other end is printed. Therefore, the signal processing substrate 19 only needs to include one electric circuit for processing the signal from the wiring pattern 41c. As a result, the number of parts of the flaw detection device 2 can be reduced.

[0093] Next, a second modification of the detection unit in the third embodiment will be described with reference to FIG. 10. FIG. 10 is a diagram showing a second modification of the detection unit of the wire rope flaw detection device according to the third embodiment.

[0094] As shown in FIG. 10, the third flexible substrate 40 includes a wiring pattern 41d, a wiring pattern 41e, and a terminal 42c.

[0095] The wiring pattern 41d is a pattern of a plurality of spiral coils. The coils of the wiring pattern 41d are provided in number corresponding to the number of the plurality of detection spaces. The wiring pattern 41d is provided on one side of the third flexible substrate 40 rather than the center of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. The coils of the wiring pattern 41d are arranged in the longitudinal direction of the third flexible substrate 40.

[0096] The wiring pattern 41e is a pattern of a plurality of spiral coils. The coils of the wiring pattern 41e are provided in number corresponding to the number of the plurality of detection spaces. The wiring pattern 41e is provided on the other side of the third flexible substrate 40 rather than the center of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. The coils of the wiring pattern 41e are arranged in the longitudinal direction of the third flexible substrate 40.

[0097] The terminal 42c is provided so as to be able to output a plurality of electrical signals respectively corresponding to the coils of the wiring pattern 41d and the coils of the wiring pattern 41e.

[0098] Although not shown, in the flaw detector 2, the third flexible substrate 40 is provided in the same manner as in the third embodiment. At this time, the wiring pattern 41d is arranged along each of the plurality of first detection grooves 10 of the second unit 4. The wiring pattern 41e is arranged along each of the plurality of first detection grooves 10 of the first unit 3. The terminal 42c is connected to the signal processing substrate 19.

[0099] For example, the signal processing board 19 has an electric circuit that generates components of a damage signal from an electric signal and has a number twice that of a plurality of detection spaces. For example, the signal processing board 19 receives inputs of a plurality of electric signals corresponding to the coils of the wiring pattern 41d and the coils of the wiring pattern 41e. The signal processing board 19 identifies a damaged wire rope 1 among the plurality of wire ropes 1 by comparing components of a plurality of damage signals corresponding to the plurality of electric signals, and also identifies on which side of the first unit 3 and the second unit 4 the damage exists in the damaged wire rope 1.

[0100] According to the second modification of the third embodiment described above, the flaw detection device 2 has the third flexible substrate 40 on which the wiring pattern 41d and the wiring pattern 41e are printed. Therefore, it is possible to reduce the number of parts of the flaw detection device 2 that can detect on which surface and in which direction of any of the plurality of wire ropes 1 a flaw has occurred.

[0101] Next, a third modification of the detection unit in the third embodiment will be described with reference to FIG. 11. FIG. 11 is a diagram showing a third modification of the detection unit of the wire rope flaw detection device in the third embodiment.

[0102] As shown in FIG. 11, in the third embodiment, the third flexible substrate 40 includes a terminal 42d. The terminal 42d is provided at the center of the third flexible substrate 40 in the longitudinal direction of the third flexible substrate 40. That is, the terminal 42d is provided so as to extend in a T shape with respect to the longitudinal direction of the third flexible substrate 40.

[0103] Embodiment 4. FIG. 12 is a diagram showing a gasket of the magnetization unit of the wire rope flaw detection device in the fourth embodiment. Note that the same reference numerals are given to the same or corresponding parts as those in any of the first to third embodiments. The description of that part is omitted.

[0104] As shown in FIG. 12, the first magnetization portion 7 and the second magnetization portion 18 include a laminated gasket 50 instead of the gasket 15.

[0105] The laminated gasket 50 is formed by stacking a plurality of magnetic pieces 50a in the length direction of the wire rope 1 not shown in FIG. 12. For example, the outer shape of the laminated gasket 50 is substantially the same as the outer shape of the gasket 15 in the first embodiment. In the laminated gasket 50, the area of the curved surface is larger than the sum of the cross-sectional areas of the plurality of wire ropes 1.

[0106] Each of the plurality of magnetic pieces 50a is a ferromagnetic sheet metal. The plurality of magnetic pieces 50a have a surface with the same shape as the cross-section in the length direction of the gasket 15 in the first embodiment. Each of the plurality of magnetic pieces 50a is adhered to each other so as to be stacked in the length direction.

[0107] Although not shown, in the flaw detection device 2, the laminated gasket 50 is arranged in the first unit 3 and the second unit 4 in the same manner as the gasket 15 in the first embodiment. The loop of magnetic flux formed by each of the pair of magnets 13 passes through the inside of the laminated gasket 50.

[0108] According to the fourth embodiment described above, the flaw detection device 2 includes a laminated gasket 50. The laminated gasket 50 efficiently transmits the magnetic flux formed between the magnet 13 and the wire rope 1. Therefore, the density of the magnetic flux formed inside the wire rope 1 can be improved. As a result, the density of the leakage magnetic flux from the flaw generated in the wire rope 1 increases. The flaw detection accuracy of the flaw detection device 2 can be improved. Or, a less expensive magnet 13 can be used.

[0109] Embodiment 5. FIG. 13 is a diagram showing a magnetization portion of a flaw detection device for a wire rope in the fifth embodiment. In addition, the same reference numerals are assigned to the same or corresponding parts as those in any of the first to fourth embodiments. The description of the corresponding parts is omitted.

[0110] As shown in FIG. 13, in Embodiment 5, the first magnetization unit 7 includes a pair of magnetization gaskets 51, a magnet 52, a plurality of shafts 53, and a plurality of bolts 54.

[0111] Each of the pair of magnetization gaskets 51 is a ferromagnetic material. For example, each of the pair of magnetization gaskets 51 is formed by stacking a plurality of magnetic pieces 50a, similar to the laminated gasket 50 of Embodiment 4. In each of the pair of magnetization gaskets 51, the surface facing the first cover portion 5 (not shown in FIG. 13) has a plurality of grooves 51a along the undulations of the plurality of first detection grooves 10 formed in the first adjacent surface 8. Each of the pair of magnetization gaskets 51 has a plurality of connection holes 51b. The number of the plurality of connection holes 51b is equal to the number of the plurality of first detection grooves 10. Each of the plurality of connection holes 51b is provided in parallel with each of the plurality of grooves 51a. Each of the plurality of connection holes 51b penetrates the magnetization gasket 51.

[0112] The magnet 52 is formed in a rectangular parallelepiped shape with the long side equal to the length in the arrangement direction of the first cover portion 5. The N pole of the magnet 52 is formed in the direction facing the surface perpendicular to the long side. The S pole of the magnet 52 is formed in the direction opposite to the N pole. The magnet 52 includes a plurality of holes 52a penetrating from the N pole to the S pole. The number of the plurality of holes 52a is equal to the number of the plurality of connection holes 51b of the magnetization gasket 51. The plurality of holes 52a are formed at the same intervals as the plurality of connection holes 51b.

[0113] The magnet 52 is arranged such that the direction of the magnetic flux from the S pole to the N pole faces from one of the pair of magnetization gaskets 51 to the other. The magnet 52 is arranged at a position where the plurality of holes 52a and the plurality of connection holes 51b are connected. For example, the magnet 52 is in contact with one of the pair of magnetization gaskets 51. In the projection plane from the other to one of the pair of magnetization gaskets 51, the magnet 52 is arranged between each of the plurality of grooves 51a and the surface on the opposite side of the plurality of grooves 51a.

[0114] Each of the plurality of shafts 53 has the same configuration. The number of the plurality of shafts 53 is equal to the number of the plurality of first detection grooves 10. The shaft 53 has ferromagnetism. For example, the shaft 53 is formed in a round bar shape. In the longitudinal direction of the shaft 53, the length of the shaft 53 is equal to the value obtained by subtracting the length of each of the pair of magnetization gaskets 51 and the length of the magnet 52 from the length of the first cover portion 5. The shaft 53 has female threads cut in the longitudinal direction at both ends.

[0115] Each of the plurality of shafts 53 is disposed at a position corresponding to the plurality of holes 52a of the magnet 52 and the plurality of connection holes 51b of the magnetization gasket 51 as a crosslinked body between the other of the pair of magnetization gaskets 51 and the magnet 52. The longitudinal direction of each of the plurality of shafts 53 faces from one of the pair of magnetization gaskets 51 to the other. One end of each of the plurality of shafts 53 is in contact with the magnet 52. The other end of each of the plurality of shafts 53 is in contact with the other of the pair of magnetization gaskets 51.

[0116] The number of the plurality of bolts 54 is twice the number of the plurality of shafts 53. The plurality of bolts 54 have paramagnetism. The plurality of bolts 54 connect the pair of magnetization gaskets 51, the magnet 52, and the plurality of shafts 53 in the direction of the first detection groove 10. Specifically, some bolts 54 are screwed into one of the shafts 53 through one connection hole 51b of the pair of magnetization gaskets 51 and the hole 52a of the magnet 52. Some bolts 54 are screwed into the other of the shafts 53 through the other connection hole 51b of the pair of magnetization gaskets 51.

[0117] Although not shown, the pair of magnetization gaskets 51, the magnet 52, and the plurality of shafts 53 are disposed inside the first cover portion 5. The pair of magnetization gaskets 51 are disposed along the plurality of first detection grooves 10. The pair of magnetization gaskets 51 are disposed on both sides of the first detection portion 6.

[0118] Although not shown, a pair of magnetization gaskets 51 form magnetic flux that travels from one to the other as a pair of magnetic poles. The pair of magnetization gaskets 51 form magnetic flux in a part of each of the plurality of wire ropes 1. Specifically, the magnetic flux forms a loop that passes from the N pole of the magnet 52 through one of the pair of magnetization gaskets 51, a part of the wire rope 1, the other of the pair of magnetization gaskets 51, the shaft 53, and the S pole of the magnet 52.

[0119] According to Embodiment 5 described above, the flaw detection device 2 includes a pair of magnetization gaskets 51, a magnet 52, and a shaft 53 that is a cross member. For this reason, for example, one of the back yoke 14 and the pair of magnets 13 in the flaw detection device 2 of Embodiment 4 can be reduced. That is, the number of parts of the flaw detection device 2 can be reduced.

Explanation of Signs

[0120] 1 wire rope, 2 flaw detection device, 2a detection space, 3 first unit, 4 second unit, 5 first cover part, 6 first detection part, 7 first magnetization part, 8 first adjacent surface, 9 first lateral surface, 10 first detection groove, 11 first slit, 12 terminal, 13 magnet, 14 back yoke, 15 gasket, 16 second cover part, 17 second detection part, 18 second magnetization part, 19 signal processing board, 20 board case, 21 second adjacent surface, 22 second lateral surface, 23 second detection groove, 24 second slit, 25 magnet, 26 back yoke, 27 gasket, 30 first flexible board, 31, 31a, 31b wiring pattern, 32a, 32b terminal, 40 third flexible board, 41a, 41b, 41c, 41d, 41e wiring pattern, 42a, 42b, 42c, 42d terminal, 50 laminated gasket, 50a magnetic piece, 51 magnetization gasket, 51a groove, 51b connection hole, 52 magnet, 52a hole, 53 shaft, 54 bolt

Claims

1. It has a pair of magnetic elements spaced apart from each other adjacent to the wire rope, a magnetization part that forms a magnetic flux in a part of the length direction of the wire rope by the pair of magnetic elements, A first detection part that is disposed between the pair of magnetic elements and detects leakage magnetic flux leaking from a damaged part of the wire rope by the magnetic flux formed by the magnetization part, A first adjacent surface that covers the pair of magnetic elements of the magnetization part and the first detection part, and a first detection groove having a semi-circular shape with a radius of curvature larger than the radius of the wire rope in which the first adjacent surface is recessed toward the side of the pair of magnetic elements from one of the pair of magnetic elements to the other, and a first cover part in which the inner surface of the first detection groove is arranged along the outer peripheral surface of the wire rope in a state of being separated from the outer peripheral surface of the wire rope, comprising The magnetization part has ferromagnetism, one of a pair of gaskets arranged along the first detection groove of the first cover part, has ferromagnetism, the other of the pair of gaskets arranged along the first detection groove of the first cover part, a magnet arranged in a direction to form a magnetic flux facing the length direction of the wire rope, has ferromagnetism, and a crosslinked body arranged to be in contact with the magnet on a surface facing the length direction of the wire rope, having One surface of the pair of gaskets facing the length direction of the wire rope is in contact with one surface of the magnet facing the length direction of the wire rope, The other surface of the magnet facing the length direction of the wire rope is in contact with one end of the crosslinked body, A flaw detection device for a wire rope in which the other surface of the pair of gaskets facing the length direction of the wire rope is in contact with the other end of the crosslinked body.

2. A second detection part that is disposed on the side opposite to the first detection part with respect to the wire rope and detects leakage magnetic flux leaking from a damaged part of the wire rope by a magnetic flux formed in a part of the length direction of the wire rope, A second adjacent surface covering the second detection unit, and a semi-circular second detection groove having a radius of curvature larger than the radius of the wire rope in which the second adjacent surface is recessed on the side of the second detection unit. The inner surface of the second detection groove is arranged along the outer peripheral surface of the wire rope on the side opposite to the first cover portion with respect to the wire rope, so that a cylindrical detection space having a radius larger than the radius of the wire rope is formed by the first detection groove and the second detection groove of the first cover portion. A second cover portion; The wire rope flaw detection device according to claim 1, comprising:

3. The wire rope flaw detection device according to claim 1 or 2, wherein the first detection unit has a flexible substrate provided on the first adjacent surface of the first cover portion in a state where a spiral coil is printed and bent in a semi-circular shape along the first detection groove.

4. The wire rope flaw detection device according to any one of claims 1 to 3, wherein each of the pair of gaskets is formed by laminating ferromagnetic plates.

5. A magnetization unit having a pair of magnetic elements adjacent to and separated from a plurality of wire ropes, and forming a magnetic flux in a part of the longitudinal direction of the plurality of wire ropes by the pair of magnetic elements; It is formed longer than the width in which the plurality of wire ropes are arranged, is disposed between the pair of magnetic elements, and detects leakage magnetic flux leaking from a damaged portion of any one of the plurality of wire ropes by the magnetic flux formed by the magnetization unit. A first detection unit; A first adjacent surface covering the pair of magnetic elements of the magnetization unit and the first detection unit, and a plurality of semi-circular first detection grooves having a radius of curvature larger than the radius of the plurality of wire ropes in which the first adjacent surface is recessed from one of the pair of magnetic elements to the other. The inner surfaces of the plurality of first detection grooves are arranged along the outer peripheral surfaces of the plurality of wire ropes in a state of being separated from the outer peripheral surfaces of the plurality of wire ropes, respectively. A first cover portion; comprising The magnetization unit is One of a pair of gaskets having ferromagnetism and arranged along the plurality of first detection grooves of the first cover portion, The other of the pair of gaskets having ferromagnetism and arranged along the plurality of first detection grooves of the first cover portion, A magnet arranged in a direction to form a magnetic flux facing the length direction of the plurality of wire ropes, A crosslinked body having ferromagnetism and arranged to contact the magnet on a surface facing the length direction of the plurality of wire ropes, having, One surface of the pair of gaskets facing the length direction of the plurality of wire ropes is in contact with one surface of the magnet facing the length direction of the plurality of wire ropes, The other surface of the magnet facing the length direction of the plurality of wire ropes is in contact with one end of the crosslinked body, A flaw detection device for a wire rope in which the other surface of the pair of gaskets facing the length direction of the plurality of wire ropes is in contact with the other end of the crosslinked body.

6. The flaw detection device for a wire rope according to claim 5, wherein the magnet is in contact with only one of the pair of gaskets.

7. It is formed longer than the width in which the plurality of wire ropes are arranged, is arranged on the side opposite to the first detection portion with respect to the plurality of wire ropes, and is formed by a magnetic flux formed in a part of the length direction of the plurality of wire ropes. A second detection unit that detects leakage magnetic flux leaking from a damaged portion of any of the plurality of wire ropes, A second adjacent surface covering the second detection unit, and a plurality of second detection grooves having a semicircular shape with a radius of curvature larger than the radius of the plurality of wire ropes, in which the second adjacent surface is recessed toward the second detection unit side. The inner surfaces of the plurality of second detection grooves are arranged along the outer peripheral surfaces of the plurality of wire ropes on the side opposite to the first cover portion with respect to the plurality of wire ropes, so that the plurality of first detection grooves of the first cover portion and the plurality of second detection grooves form a plurality of cylindrical detection spaces having a radius larger than the radius of the plurality of wire ropes. A second cover portion, The wire rope flaw detection device according to claim 5 or claim 6, comprising

8. The first detection unit is formed longer than the width in which the plurality of wire ropes are arranged side by side, has a spiral coil printed thereon, and is provided on the first adjacent surface of the first cover portion in a state of being bent along the plurality of first detection grooves. The wire rope flaw detection device according to any one of claims 5 to 7, having a first flexible substrate.

9. The first detection unit is formed longer than the width in which the plurality of wire ropes are arranged side by side, has a plurality of spiral coils printed thereon, and is provided on the first adjacent surface of the first cover portion in a state of being bent along the plurality of first detection grooves. The wire rope flaw detection device according to any one of claims 5 to 7, having a first flexible substrate.

10. A magnetization unit having a pair of magnetic elements adjacent to and separated from each other among the plurality of wire ropes, and forming a magnetic flux in a part of the longitudinal direction of the plurality of wire ropes by the pair of magnetic elements; A first detection unit formed longer than the width in which the plurality of wire ropes are arranged side by side, disposed between the pair of magnetic elements, and detecting leakage magnetic flux leaking from a damaged portion of any one of the plurality of wire ropes by the magnetic flux formed by the magnetization unit; A first adjacent surface covering the pair of magnetic elements of the magnetization unit and the first detection unit, and a plurality of semi-circular first detection grooves having a radius of curvature larger than the radius of the plurality of wire ropes, in which the first adjacent surface is recessed toward the side of the pair of magnetic elements from one of the pair of magnetic elements to the other, and an inner surface of the plurality of first detection grooves is arranged along an outer peripheral surface of the plurality of wire ropes in a state of being separated from the outer peripheral surface of the plurality of wire ropes; a first cover portion; Comprising The first detection unit is formed longer than the width in which the plurality of wire ropes are arranged side by side, has a plurality of spiral coils printed thereon, and is provided on the first adjacent surface of the first cover portion in a state of being bent along the plurality of first detection grooves, and has a first flexible substrate. The plurality of coils are flaw detection devices for wire ropes arranged to face the plurality of first detection grooves respectively.

11. It is formed longer than the width in which the plurality of wire ropes are arranged side by side, is arranged on the side opposite to the first detection unit with respect to the plurality of wire ropes, and is formed by magnetic flux formed in a part of the length direction of the plurality of wire ropes. A second detection unit that detects leakage magnetic flux leaking from a damaged part of any of the plurality of wire ropes; A second adjacent surface covering the second detection unit, and a plurality of semi-circular second detection grooves having a radius of curvature larger than the radius of the plurality of wire ropes in which the second adjacent surface is recessed on the side of the second detection unit. The inner surfaces of the plurality of second detection grooves are arranged along the outer peripheral surfaces of the plurality of wire ropes on the side opposite to the first cover portion with respect to the plurality of wire ropes, so that the plurality of first detection grooves of the first cover portion and the plurality of second detection grooves A second cover portion that forms a plurality of detection spaces having a cylindrical shape with a radius larger than the radius of the plurality of wire ropes; The wire rope flaw detection device according to claim 10, comprising:

12. The magnetization unit is Has ferromagnetic properties, and a back yoke arranged from one of the pair of magnetic elements to the other so as to be in contact with the surfaces of each of the pair of magnetic elements on the side opposite to the plurality of wire ropes; One of a pair of gaskets provided to fill a gap formed between one of the pair of magnetic elements and the first cover portion between one of the pair of magnetic elements and the first adjacent surface of the first cover portion; The other of a pair of gaskets provided to fill a gap formed between the other of the pair of magnetic elements and the first cover portion between the other of the pair of magnetic elements and the first adjacent surface of the first cover portion; The wire rope flaw detection device according to claim 10 or claim 11, comprising:

13. The first detection unit has a first flexible substrate provided on the first adjacent surface of the first cover portion in a state where it is formed longer than the width in which the plurality of wire ropes are arranged side by side, a spiral coil is printed, and it is bent along the plurality of first detection grooves. The flaw detection device for a wire rope according to claim 7 or claim 11, wherein the second detection unit has a second flexible substrate provided on the second adjacent surface of the second cover portion in a state where it is formed longer than the width in which the plurality of wire ropes are arranged side by side, a spiral coil is printed, and it is bent along the plurality of second detection grooves.

14. A third flexible substrate that is formed longer than twice the width in which the plurality of wire ropes are arranged side by side, a spiral coil is printed, one side from the center in the longitudinal direction is provided along the first adjacent surface of the first cover portion as the first detection unit, and the other side from the center in the longitudinal direction is provided along the second adjacent surface of the second cover portion as the second detection unit. The flaw detection device for a wire rope according to claim 7 or claim 11, comprising the same.

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