JP5444145B2 - Rope tester - Google Patents

Description

  The present invention relates to a rope tester having a magnetic flaw detector that magnetizes a wire rope with a permanent magnet and detects a magnetic flux leaking from a damaged portion with a magnetic sensor, and in particular, inspects a plurality of wire ropes simultaneously. The present invention relates to a rope tester equipped with a magnetic flaw detector.

As a wire rope flaw inspection device, when there is a magnetized part that magnetizes a predetermined section of the wire rope with a permanent magnet or an electromagnet, and when there is a damaged part of the wire rope in the predetermined section, magnetic flux leaking from the vicinity of the damaged part is detected Some have a magnetic flaw detector provided with a magnetic sensor that is a detection unit.
This wire rope flaw inspection apparatus is generally called a rope tester and includes a magnetic flaw detector, a controller, and a recording unit. However, in the conventional rope tester, the magnetic flaw detector is composed of one magnetic sensor, and the wire ropes are inspected one by one.

Since this conventional rope tester has a single magnetic sensor, there has been a problem that it takes a lot of time and labor to inspect the wire rope in the equipment or apparatus in which a plurality of wire ropes are used.
As a rope tester capable of simultaneously inspecting a plurality of wire ropes that have solved such a problem, a detector (equivalent to a magnetic flaw detector) is formed of a non-magnetic metal and has an opening on one side. Some of them are formed of a plurality of magnetization detectors (corresponding to magnetic sensors) that are arranged adjacent to each other in parallel and fixed in parallel.
In the detector of this rope tester, the detection part of the magnetization detector is on the opening surface side of the housing, and detects a flaw on the wire rope through the guide plate. Adjacent magnetization detectors are arranged with their positions alternately shifted in the longitudinal direction (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-089172 (page 4, page 5, FIG. 2, FIG. 3)

The detector of the rope tester described in Patent Document 1 has a plurality of magnetization detectors arranged adjacent to each other and fixed in parallel to a casing formed of a rigid metal.
When this rope tester is used in an elevator that is a facility that uses multiple wire ropes, when one wire rope vibrates, the vibration is transmitted to the detector (magnetic flaw detector) of the rope tester and vibrates. Not only the magnetization detector (magnetic sensor) for inspecting the wire rope but also the magnetization detector (magnetic sensor) for inspecting other wire ropes vibrate.

When the magnetization detector (magnetic sensor) vibrates, the relative position between the wire rope and the magnetization detector (magnetic sensor) changes, causing a change in the leakage flux from the wire rope, which is similar to the damaged portion of the wire rope. Generated noise.
That is, the rope tester described in Patent Document 1 has a problem that all wire ropes are inspected due to vibration of one wire rope.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to simultaneously detect flaws of a plurality of wire ropes used in equipment and devices, and to detect vibrations of one wire rope. An object of the present invention is to obtain a rope tester equipped with a magnetic flaw detector that does not cause problems in the inspection of all wire ropes.

  A rope tester according to the present invention is a rope tester provided with a magnetic flaw detector having a mounting plate and a plurality of magnetic sensors arranged in parallel to the mounting plate, and is attached to the mounting plate forming the magnetic flaw detector. The attachment to which the magnetic sensor is attached is fixed via a flat cushioning material, and the plurality of magnetic sensors forming the magnetic flaw detector are provided with a side cushioning material between the magnetic sensors, and the plurality of magnetic sensors The side cushioning material is in contact with and fixed integrally.

  A rope tester according to the present invention is a rope tester provided with a magnetic flaw detector having a mounting plate and a plurality of magnetic sensors arranged in parallel to the mounting plate, and is attached to the mounting plate forming the magnetic flaw detector. The attachment to which the magnetic sensor is attached is fixed via a flat cushioning material, and the plurality of magnetic sensors forming the magnetic flaw detector are provided with a side cushioning material between the magnetic sensors, and the plurality of magnetic sensors It is fixed in contact with the side cushioning material and can detect the damage of multiple wire ropes at the same time, and the vibration of one wire rope may cause problems in the inspection of all wire ropes. Can be prevented.

It is a plane schematic diagram by the side which contacts the wire rope of the magnetic flaw detector in the rope tester concerning Embodiment 1 of this invention. It is a plane schematic diagram on the opposite side to the surface which contacts the wire rope of the magnetic flaw detector in the rope tester concerning Embodiment 1 of this invention. FIG. 3 is a schematic side view of the magnetic flaw detector shown in FIG. 2 viewed from the direction indicated by an arrow F. It is a cross-sectional schematic diagram which shows the detail of the attachment structure of the magnetic sensor to the attachment plate in a magnetic flaw detector. It is the perspective schematic diagram (a) and side schematic diagram (b) which show the external appearance of a magnetic sensor. It is a perspective schematic diagram which shows the structure of a magnetic sensor. It is a schematic diagram of the BB cross section of the magnetic sensor shown in FIG.5 (b). FIG. 8 is a schematic diagram of a CC cross section in the schematic cross sectional view of the magnetic sensor shown in FIG. 7. It is a figure explaining the mechanism which detects the damaged part of a wire rope with a magnetic sensor. It is a cross-sectional schematic diagram of the AA cross section of the magnetic flaw detector shown in FIG. It is a figure which shows the positional relationship of a magnetic sensor and a wire rope when a wire rope vibrates in the magnetic flaw detector with which the magnetic sensor was directly fixed to the mounting plate without using a flat cushioning material. It is a figure which shows the state of the magnetic sensor of the magnetic flaw detector of this Embodiment when a wire rope vibrates.

  Below, the suitable form of the rope tester by this invention is demonstrated using drawing.

Embodiment 1 FIG.
FIG. 1 is a schematic plan view of a side in contact with a wire rope of a magnetic flaw detector in the rope tester according to Embodiment 1 of the present invention.
FIG. 2 is a schematic plan view of the opposite side of the surface in contact with the wire rope of the magnetic flaw detector in the rope tester according to Embodiment 1 of the present invention.
FIG. 3 is a schematic side view of the magnetic flaw detector shown in FIG.
In FIG. 1 to FIG. 3, a side where the magnetic flaw detector 100 is in contact with the wire rope 1 is referred to as a wire rope contact surface, and a surface opposite to this surface is referred to as a mounting plate surface.

The rope tester includes a magnetic flaw detector, a controller, and a recording unit, and the magnetic flaw detector 100 used in the rope tester of the present embodiment sandwiches the side cushioning material as shown in FIGS. Thus, a plurality of magnetic sensors 2 arranged in parallel at a predetermined interval, a mounting plate 17, and an attachment 18 for coupling the magnetic sensor 2 to the mounting plate 17 are provided.
And the magnetic sensor 2 consists of the sensor main-body part 2a and the extension support part 2b.
Further, the side cushioning material includes a first side cushioning material 12a provided on the mounting plate portion side in the longitudinal direction of the magnetic sensor 2 and a second side provided on the end portion on the opposite side of the mounting plate portion side. There is a side cushioning material 12b.

The attachment 18 is directly attached to the sensor main body 2a, and the attachment 18 to which the magnetic sensor 2 is attached is a fixing bolt (first fixing bolt) to the attachment plate 17 via a flat cushioning material. It is fixed by 25).
The flat cushioning material 23 has a first flat cushioning material 23a provided between the mounting plate 17 and the attachment 18 and a contact surface of the mounting plate 17 opposite to the first flat cushioning material 23a. And a second flat cushioning material 23b provided on the surface.
The structure for attaching the magnetic sensor 2 to the attachment 18 will be described later.

FIG. 4 is a schematic cross-sectional view showing details of a structure for attaching a magnetic sensor to an attachment plate in a magnetic flaw detector.
As shown in FIG. 4, each of the attachment 18, the first flat cushioning material 23 a, the mounting plate 17, and the second flat cushioning material 23 b is provided with through holes in the plate thickness direction. Are communicated from the wire rope contact surface side of the magnetic flaw detector 100 to the mounting plate surface side. A countersink is provided on the magnetic sensor 2 side of the through hole of the attachment 18.

That is, the first fixing bolts 25 inserted in advance in the through holes of the attachment 18 are inserted through the through holes of the first flat cushioning material 23a, the mounting plate 17, and the second flat cushioning material 23b. The attachment 18 attached to the sensor main body 2a of the magnetic sensor 2 is fixed to the attachment plate 17 by fitting the washer 26 and the spring washer 27 to the first fixing bolt 25 and screwing the nut 28 together. .
That is, the magnetic sensor 2 is fixed to the mounting plate 17 via the flat cushioning material.
In the magnetic flaw detector 100 of the present embodiment, one magnetic sensor 2 is fixed by the two first fixing bolts 25, but is not limited thereto.

FIG. 5 is a schematic perspective view (a) and a schematic side view (b) showing the appearance of the magnetic sensor.
As shown in FIG. 5, the magnetic sensor 2 (which will be described in detail later) includes a sensor main body 2a that detects a damaged portion of the wire rope 1, and an extended support 2b that makes the wire rope 1 contact the sensor main body 2a in parallel. The lower surface of the sensor main body 2 a in FIG. 5 is attached to the attachment plate 17 via the attachment 18.
As shown in FIGS. 1 to 3, a first side cushioning material 12a is disposed in contact with the side surface of the adjacent sensor body 2a between the sensor bodies 2a of the plurality of magnetic sensors 2 arranged in parallel. The second side cushioning material 12b is disposed between the extension support portions 2b of the plurality of magnetic sensors 2 arranged in parallel and in contact with the side surfaces of the adjacent extension support portions 2b.

Moreover, as shown in FIGS. 1-3, each sensor main-body part 2a and the 1st side surface buffer material 12a arrange | positioned between each sensor main-body part 2a are the sensor main-body part 2a and the 1st side surface buffer material. The washer 14 and the spring washer 15 are fitted to the first magnetic sensor connecting bolt 13a inserted through the through hole formed in communication with the terminal 12a, and the nut 16 is screwed to be fixed.
Further, each extension support portion 2b and the second side cushioning material 12b disposed between each extension support portion 2b are penetrations formed by communicating the extension support portion 2b and the second side cushioning material 12b. The washer 14 and the spring washer 15 are fitted to the second magnetic sensor connecting bolt 13b inserted through the hole, and the nut 16 is screwed to fix the bolt.
That is, each magnetic sensor 2 is fixed by disposing the side cushioning material 12 therebetween.

FIG. 6 is a schematic perspective view showing the structure of the magnetic sensor.
FIG. 6 shows a state in which the protective plate 6 through which the wire rope 1 is passed is removed from the sensor main body 2a.
As shown in FIG. 6, the sensor body 2 a includes a rope guide 7 provided at both ends of the plane of the support base 5, a back yoke 3 placed between the rope guides 7 of the support base 5, and a back yoke. 3 includes a pair of first permanent magnets 4a and second permanent magnets 4b provided at both ends of the plane, and a detection coil 8 provided at substantially the center of the plane of the back yoke 3.

The rope guide 7, the first permanent magnet 4 a, the second permanent magnet 4 b, and the detection coil 8 are U-shaped grooves on the side facing the wire rope 1. Each U-shaped groove is covered with a protective plate 6 that fits into these grooves.
That is, the protective plate 6 covering the sensor main body 2a is also formed with a groove in the longitudinal direction on the side facing the wire rope 1, and the wire rope 1 contacts the groove.

Next, the sensor main body 2a in the magnetic sensor 2 for detecting the damaged portion of the wire rope 1 will be described in detail.
FIG. 7 is a schematic diagram of a BB cross section of the magnetic sensor shown in FIG.
8 is a schematic diagram of a CC cross section in the schematic cross-sectional view of the magnetic sensor shown in FIG.
FIG. 9 is a diagram illustrating a mechanism for detecting a damaged portion of a wire rope by a magnetic sensor.
7, 8, and 9 also show a wire rope 1 that is an object to be inspected, and FIGS. 8 and 9 show a sensor main body 2 a in the magnetic sensor 2.

As shown in FIG. 7, the wire rope 1 is attracted and brought into contact with the U-shaped groove of the protective plate 6 of the magnetic sensor 2 by the attractive force of the first and second permanent magnets 4a and 4b (not shown).
As shown in FIG. 8, the first permanent magnet 4 a provided on the one end side plane of the back yoke 3 in the sensor main body 2 a has an S-shaped U-shaped groove side, and the other end of the back yoke 3. The second permanent magnet 4b provided on the side plane has an N-pole on the U-shaped groove side.

The back yoke 3, the second permanent magnet 4b, the wire rope 1, and the first permanent magnet 4a form a closed-loop magnetic path, and this magnetic path is connected to the wire rope from the second permanent magnet 4b side. 1, the magnetic flux 9 flows to the first permanent magnet 4 a side. The magnetic flux 9 that has flowed toward the first permanent magnet 4a passes through the back yoke 3 and returns to the second permanent magnet 4b.
As shown in FIG. 9, if there is a damaged portion 10 in the wire rope 1, a part of the magnetic flux 9 flowing in the wire rope 1 leaks outside the wire rope 1 in the vicinity of the damaged portion 10. The sensor 2 detects the presence or absence of damage by detecting the leakage magnetic flux 11 with the detection coil 8.

Next, a structure for attaching the attachment 18 to the magnetic sensor 2 and a structure for attaching the magnetic flaw detector 100 to the machine base of the hoisting machine will be described.
FIG. 10 is a schematic cross-sectional view taken along the line AA of the magnetic flaw detector shown in FIG.
As shown in FIG. 10, the second fixing bolt 24 is inserted through a through hole provided with a countersink on the flat surface side of the attachment 18 that contacts the first flat cushioning material 23 a. The attachment 18 is attached to the sensor main body 2a of the magnetic sensor 2 by screwing into a female screw hole formed on the surface of the support 5 opposite to the surface on which the back yoke 3 is provided.

Further, as shown in FIG. 10, the other end side of the mounting plate 17 of the magnetic flaw detector 100 is bent in a direction substantially perpendicular to the mounting surface of the magnetic sensor 2. The direction in which the mounting plate 17 is bent is opposite to the side of the mounting plate 17 on which the magnetic sensor 2 is mounted.
A hook 20 is attached to a bent portion of the attachment plate 17 (referred to as a right angle portion of the attachment plate) via an intermediate block 22.

In other words, the adjustment screw 21 is inserted into the right-angle portion of the attachment plate, the intermediate block 22 and the hook 20 and communicated therewith, and a bolt is screwed into the adjustment screw 21 to hook the attachment plate 17 to the hook. 20 is attached.
Further, one end of the hook 20 is bent in a U shape, and this portion is hung on a shaft 19 that supports the magnetic flaw detector 100 for setting it on the wire rope of the hoist.
Further, the position of the hook 20 can be adjusted by the adjusting screw 21.

Next, the state in which the wire rope 1 vibrates in the magnetic flaw detector 100 of the present embodiment will be described.
FIG. 11 is a diagram showing a positional relationship between the magnetic sensor and the wire rope when the wire rope vibrates in the magnetic flaw detector in which the magnetic sensor is directly fixed to the mounting plate without using a flat cushioning material.

The wire rope 1 is adsorbed and in contact with the U-shaped groove of the protective plate 6 by the attractive force of the first and second permanent magnets 4a and 4b. However, as shown in FIG. 11, when the wire rope 1 vibrates in the height direction of the magnetic sensor 2, that is, in the X direction, a gap Δ is generated between the protection plate 6 of the magnetic sensor 2 and the wire rope 1. .
When the size of the gap fluctuates due to vibration, the detection coil 8 of the magnetic sensor 2 detects a leakage magnetic flux similar to the damage of the wire rope 1 and becomes noise in detecting a damaged portion of the wire rope 1.

FIG. 12 is a diagram illustrating a state of the magnetic sensor of the magnetic flaw detector according to the present embodiment when the wire rope vibrates.
FIG. 12 shows a state where the magnetic sensor is attached to the attachment plate 17, that is, the attachment 18 to which the magnetic sensor (not shown) is attached is attached to the attachment plate 17 via the first and second flat cushioning members 23a and 23b. It shows a fixed state.

As shown in FIG. 12, in the magnetic flaw detector 100 of the present embodiment, even if the wire rope 1 vibrates, the flat cushioning material is deformed at the attachment portion of the magnetic sensor 2 so that the magnetic sensor 2 becomes a wire rope. 1. Follow the movement of the X direction.
That is, the state in which the wire rope 1 is attracted to the protection plate 6 is maintained, and the leakage magnetic flux is generated in a portion other than the damaged portion of the wire rope 1 without generating a gap Δ between the protection plate 6 and the wire rope 1. And the generation of noise in the detection of the damaged portion of the wire rope 1 can be reduced.

  In the magnetic flaw detector 100 of the present embodiment, since the plurality of magnetic sensors 2 arranged in parallel are fixed via the side cushioning material, even if the wire rope 1 vibrates, this vibration The vibration is not transmitted to the magnetic sensors 2 other than the magnetic sensor 2 in contact with the wire rope 1, and the generation of the leakage magnetic flux other than the damaged portion of the wire rope 1 is suppressed, and the damaged portion of the wire rope 1 is detected. The generation of noise can be reduced.

  In the rope tester according to the present invention, since the magnetic flaw detector forming the rope tester has the magnetic sensor attached to the mounting plate via the cushioning material, the damaged part of the wire rope is detected in the equipment in which the wire rope vibrates. Used for.

1 wire rope, 2 magnetic sensor, 2a sensor body, 2b extension support,
3 back yoke, 4a first permanent magnet, 4b second permanent magnet, 5 support base,
6 Protection plate, 7 Rope guide, 8 Detection coil, 9 Magnetic flux, 10 Damaged part,
11 leakage magnetic flux, 12a first side cushioning material, 12b second side cushioning material,
13a 1st magnetic sensor connection bolt, 13b 2nd magnetic sensor connection bolt,
14 washer, 15 spring washer, 16 nut, 17 mounting plate,
18 attachments, 19 axes, 20 hooks, 21 adjustment screws,
22 intermediate block, 23a first flat cushioning material, 23b second flat cushioning material,
24 second fixing bolt, 25 first fixing bolt, 26 washer,
27 Spring washer, 28 nut, 100 Magnetic flaw detector.

Claims (6)

A rope tester including a magnetic flaw detector having a mounting plate and a plurality of magnetic sensors arranged in parallel to the mounting plate,
An attachment to which the magnetic sensor is attached is fixed to the mounting plate that forms the magnetic flaw detector via a flat cushioning material,
The plurality of magnetic sensors forming the magnetic flaw detector include a rope tester in which a side cushioning material is provided between the magnetic sensors, and the plurality of magnetic sensors and the side cushioning material are in contact and fixed integrally. . The planar cushioning material, a first planar cushioning material provided between the said mounting plate and the attachment, provided on the opposite side of the contact surface between the first plane buffer material in the mounting plate The rope tester according to claim 1 , wherein the rope tester is formed of a second flat cushioning material. The side cushioning material, in the longitudinal direction of the magnetic sensor, a first side cushioning material provided to the mounting plate portion side, a second side buffer provided on the opposite end of the mounting plate portion The rope tester according to claim 1 , wherein the rope tester is formed of a material. The rope tester according to any one of claims 1 to 3, wherein the magnetic sensor includes a sensor main body and an extension support. The attachment is attached to the sensor body and the sensor body is in the mounting plate portion, so that the extension support unit is on the end opposite of the mounting plate portion, said magnetic sensor The rope tester according to claim 4 , wherein the rope tester is disposed on the mounting plate portion. The sensor body includes a support, a rope guide provided at both ends of the plane of the support, a back yoke placed between the rope guides of the support, and both ends of the plane of the back yoke. A pair of first permanent magnets and second permanent magnets, a detection coil provided substantially at the center of the plane of the back yoke, the support base, the rope guide, the back yoke, and the first yoke. A protective plate that covers the permanent magnet, the second permanent magnet, and the detection coil, and the rope guide, the first permanent magnet, the second permanent magnet, the detection coil, and the protective plate. The rope tester according to claim 4 or 5 , wherein a side facing the wire rope is a U-shaped groove.

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