JP7435835B2 - Wire rope flaw detection equipment and wire rope flaw detection method - Google Patents

Description

The present disclosure relates to a wire rope flaw detection device and a wire rope flaw detection method.

Patent Document 1 discloses a wire rope flaw detection device. The wire rope flaw detection device described in Patent Document 1 includes a magnetizing means that magnetizes the wire rope in the longitudinal direction, and a sensor section that detects magnetic flux leaking from a damaged part that occurs in the magnetized portion of the wire rope that is magnetized by the magnetizing means. It is equipped with the following.

The wire rope flaw detection device described in Patent Document 1 includes a structure disposed to face a sensor section with a wire rope in between. This prevents the wire rope from bending and improves flaw detection accuracy.

Japanese Patent No. 5331173

In the wire rope flaw detection device described in Patent Document 1, when performing flaw detection on a plurality of arranged wire ropes, it is necessary to separate and reassemble the sensor section and the structure every time one wire rope is flaw detected. There is. In the conventional technique described in Patent Document 1, when performing flaw detection on a plurality of arranged wire ropes, there was a problem that the work time required for flaw detection was long.

The present disclosure is intended to solve the above problems. An object of the present disclosure is to provide a wire rope flaw detection device and a flaw detection method that can accurately perform flaw detection on a plurality of wire ropes arranged in a shorter working time.

A wire rope flaw detection device according to the present disclosure includes a sensor unit that includes a magnetizer that magnetizes a wire rope and a magnetic sensor that detects leakage magnetic flux generated by a damaged portion of the wire rope. In addition, this wire rope flaw detection device has a moving shaft that allows the sensor section to move in the direction in which multiple wire ropes are arranged, a guide shaft that guides the sensor section in the direction away from the wire ropes, and a wire rope that is sandwiched between the two. A receiving surface portion facing the sensor portion. The sensor part is pressed against the wire rope along the guide axis. The moving shaft allows the sensor section to move relative to the receiving surface section. The receiving surface portion is in contact with a plurality of wire ropes.
A wire rope flaw detection method according to the present disclosure includes a sensor unit having a magnetizer that magnetizes a wire rope, a magnetic sensor that detects leakage magnetic flux generated by a damaged part of the wire rope, and a sensor unit that contacts a plurality of wire ropes. This is a wire rope flaw detection method using a wire rope flaw detection device comprising: a receiving surface portion facing a sensor portion with a wire rope in between; The wire rope flaw detection method according to the present disclosure includes a first step of sandwiching a first wire rope between a sensor section and a receiving surface section and measuring the first wire rope; a second step in which the sensor section is moved in the direction in which the wire ropes are arranged, and the sensor section is moved to the position of the second wire rope; and a third step of measuring the second wire rope by sandwiching it between the wire rope and the surface portion.

According to the wire rope flaw detection device and the wire rope flaw detection method according to the present disclosure, flaw detection of a plurality of arranged wire ropes can be performed with high accuracy in a shorter working time.

1 is a perspective view showing a wire rope flaw detection device according to Embodiment 1. FIG. 1 is a perspective view showing a state in which the wire rope flaw detection device according to Embodiment 1 is attached to a wire rope. FIG. FIG. 2 is a perspective view showing the internal structure of a sensor section included in the wire rope flaw detection device according to the first embodiment. 1 is a schematic cross-sectional view of a wire rope flaw detection device according to Embodiment 1. FIG. 5 is a diagram illustrating local leakage magnetic flux in FIG. 4. FIG. 3 is a flowchart showing a wire rope flaw detection method according to Embodiment 1. FIG. FIG. 3 is a perspective view showing a wire rope flaw detection device according to a first modification of the first embodiment. FIG. 3 is a perspective view showing a wire rope flaw detection device according to a second modification of the first embodiment. FIG. 7 is a perspective view showing a wire rope flaw detection device according to a third modification of the first embodiment. FIG. 7 is a perspective view showing a state in which the wire rope flaw detection device according to a third modification of the first embodiment is attached to a wire rope.

Embodiments will be described below with reference to the accompanying drawings. Note that common or corresponding elements in each figure are denoted by the same reference numerals, and in this disclosure, overlapping explanations will be simplified or omitted. Note that the present disclosure is not limited to the embodiments described below, and may include all combinations and modifications of the configurations disclosed by the embodiments below.

Embodiment 1.
FIG. 1 is a perspective view showing a wire rope flaw detection device 1a according to a first embodiment. FIG. 2 is a perspective view showing the wire rope flaw detection device 1a according to the first embodiment attached to the wire rope 2. As shown in FIG. FIG. 3 is a perspective view showing the internal structure of the sensor section 3 included in the wire rope flaw detection device 1a according to the first embodiment. FIG. 3 shows the sensor section 3 in detail with the protective cover 4 removed.

The wire rope flaw detection device 1a includes a sensor section 3 and a mounting section 5 that constitutes a portion other than the sensor section 3 as main components. The sensor section 3 includes a magnetizer that magnetizes the wire rope 2, and a magnetic sensor 6 that detects leakage magnetic flux generated by a damaged portion of the wire rope 2 magnetized by the magnetizer. The attachment part 5 presses the sensor part 3 against the wire rope 2 using a member such as a spring. Thereby, the relative positional relationship between the sensor section 3 and the wire rope 2 is maintained. The attachment part 5 is for ensuring the accuracy of the detection of the leakage magnetic flux by the magnetic sensor 6.

The magnetizer of the sensor section 3 forms a main magnetic path in a predetermined section of the wire rope 2 in the axial direction. The magnetizer includes, for example, a back yoke 7, a pair of excitation permanent magnets 8a and 8b, and a magnetic pole piece 9a and a magnetic pole piece 9b. The back yoke 7, the magnetic pole piece 9a, and the magnetic pole piece 9b are formed from a ferromagnetic material such as iron. A pair of permanent magnets 8a and 8b are placed on both ends of the back yoke 7, with their polarities reversed. The magnetic pole piece 9a is arranged on the opposite side of the back yoke 7 among the magnetic pole surfaces of the permanent magnet 8a. The magnetic pole piece 9b is arranged on the opposite side of the back yoke 7 among the magnetic pole surfaces of the permanent magnet 8b. The magnetic pole piece 9a and the magnetic pole piece 9b are formed in a U-shape along the curvature of the outer periphery of the wire rope 2.

The magnetic sensor 6 that detects leakage magnetic flux is composed of a coil, a Hall element, and the like. The magnetic sensor 6 is assembled to a support base 10. The support base 10 is arranged to be magnetically insulated from the magnetizer composed of the permanent magnet 8a, the permanent magnet 8b, the magnetic pole piece 9a, the magnetic pole piece 9b, and the back yoke 7. The support base 10 on which the magnetic sensor 6 is assembled is connected to the back yoke 7 via a non-magnetic member 11 so as to be magnetically insulated from the main magnetic path formed by the magnetizer.

In order to prevent magnetic flux other than the leakage magnetic flux from the wire rope 2 from being mixed into the magnetic flux detected by the magnetic sensor 6, the material of the support base 10 is preferably a ferromagnetic material. In order to prevent electrical leakage from the magnetic sensor 6 to the support base 10 side, it is desirable that the surface of the support base 10 be coated with an insulating coating. Furthermore, as shown in FIG. 3, the magnetic sensor 6 and the support base 10 are preferably formed in a U-shape like the magnetic pole pieces 9a and 9b. Thereby, the magnetic sensor 6 can be brought closer to the wire rope 2 over a wider range, and the range in which a damaged portion of the wire rope 2 can be detected can be expanded. Note that the material of the support base 10 may be non-magnetic. Further, the magnetic sensor 6 and the support base 10 may be formed as planar members arranged so that the surface faces the center of the wire rope 2.

FIG. 4 is a schematic cross-sectional view of the wire rope flaw detection device 1a. FIG. 4 shows the flow of magnetic flux when a damaged wire rope portion 12, which is a damaged portion of the wire rope 2, passes near the magnetic sensor 6. As shown in FIG. 4, the main magnetic flux generated from the permanent magnet 8a passes through the wire rope 2, passes through the permanent magnet 8b, passes through the back yoke 7, and returns to the permanent magnet 8a. The local leakage magnetic flux 13 generated near the damaged wire rope portion 12 returns to the wire rope 2 through the protective cover 4, the magnetic sensor 6, and the support stand 10, which are non-magnetic materials.

FIG. 5 is a diagram illustrating the local leakage magnetic flux 13 in FIG. 4. FIG. 5(a) is an enlarged view showing the flow of the local leakage magnetic flux 13 in FIG. 4. FIG. 5(b) is a graph showing the magnetic flux density distribution of the wire rope 2 in the radial direction x. Curve a, curve b, and curve c in the graph of FIG. 5(b) indicate the magnetic flux density distribution at the positions of dashed-dotted line a, dashed-dotted line b, and dashed-dotted line c in FIG. 5(a), respectively.

The local leakage magnetic flux 13 that has exited the wire rope 2 tries to return to the wire rope 2 through the shortest possible magnetic path. Therefore, the area of the local leakage magnetic flux 13 distributed outside the wire rope 2 becomes small. The distribution of magnetic flux density becomes smaller as the distance from the damaged wire rope portion 12 in the axial and radial directions of the wire rope 2 increases. For this reason, when the distance between the wire rope 2 and the magnetic sensor 6 increases, the intensity of the signal detected by the magnetic sensor 6 decreases.

Further, in order to generate local leakage magnetic flux 13 by wire rope damaged portion 12, it is necessary to magnetically saturate the inside of wire rope 2. When the inside of the wire rope 2 is not magnetically saturated, even if there is a damaged part 12 of the wire rope, the magnetic flux does not leak from the wire rope 2 and passes through a place in the wire rope 2 where the magnetic flux density is relatively low. .

On the other hand, when the inside of the wire rope 2 is magnetically saturated, a considerable amount of magnetic flux leaks from positions other than the damaged wire rope portion 12 as well. The leakage magnetic flux passes through the magnetic sensor 6. Therefore, when the relative positional relationship between the wire rope 2 and the magnetic sensor 6 changes, the magnetic flux passing through the magnetic sensor 6 also changes. Fluctuations in the relative positional relationship between the wire rope 2 and the magnetic sensor 6 cause noise in detecting leakage magnetic flux. When the noise becomes large, the signal detected by the magnetic sensor 6 is buried in the noise, and the accuracy of detecting the damaged wire rope portion 12 by the wire rope flaw detection device 1a decreases. Hereinafter, the detection accuracy of the wire rope damaged portion 12 by the wire rope flaw detection device 1a will also be referred to as "flaw detection accuracy."

In order to ensure flaw detection accuracy, it is necessary to maintain the relative positional relationship between the wire rope 2 and the magnetic sensor 6. A magnetic force is generated in the wire rope 2 by the permanent magnets 8a and 8b that tends to attract the sensor section 3. This magnetic force forces the wire rope 2 against the protective cover 4 of the sensor section 3. Thereby, the relative positional relationship between the wire rope 2 and the magnetic sensor 6 is maintained.

In order to completely suppress the vibrations that occur when the wire rope 2 runs, it is conceivable to make the above magnetic force stronger or to add a force other than the magnetic force. In this embodiment, a method of adding force other than magnetic force will be described as an example of a method that is low in noise and advantageous in terms of cost.

The attachment portion 5 according to the present embodiment has a function of generating a force other than magnetic force for maintaining the relative positional relationship between the wire rope 2 and the magnetic sensor 6. The mounting portion 5 having this function includes a moving shaft 14a and a moving shaft 14b that allow the sensor portion 3 to move in the direction in which the wire ropes 2 are arranged. Furthermore, the mounting portion 5 includes a front-rear shaft 15a and a front-rear shaft 15b as guide shafts that guide the sensor portion 3 in a direction away from the wire rope 2.

The attachment part 5 includes an intermediate part 16a and an intermediate part 16b that move in the same way as the sensor part 3 along the front-rear axis 15a and the front-rear axis 15b. The moving shaft 14a and the moving shaft 14b are provided in the intermediate portion 16a and the intermediate portion 16b, respectively. Furthermore, the attachment portion 5 includes a base portion 17a that is fixed to a structure around the wire rope 2. The front-rear shaft 15a and the front-rear shaft 15b are attached to the base portion 17a.

Further, the attachment section 5 includes, for example, a spring 18a and a spring 18b that generate a force that presses the sensor section 3 against the wire rope 2. The spring 18a is installed parallel to the front-rear axis 15a. The spring 18b is installed parallel to the front-rear axis 15b. The springs 18a and 18b push the sensor portion 3, the moving shaft 14a, the moving shaft 14b, the intermediate portion 16a, and the intermediate portion 16b into the wire rope 2 along the longitudinal axis 15a and the longitudinal axis 15b. Furthermore, the attachment section 5 includes a receiving surface section 19a that faces the sensor section 3 with the wire rope 2 interposed therebetween. In this embodiment, the receiving surface portion 19a is configured to be attachable to and detachable from the base portion 17a.

The moving shaft 14a passes through a hole provided in the sensor section 3. Similarly, the moving shaft 14b also passes through a hole provided in the sensor section 3. Both axial ends of the moving shaft 14a are supported by an intermediate portion 16a. Both axial ends of the moving shaft 14b are supported by an intermediate portion 16b. According to such a configuration, the sensor section 3 is movable along the movement axis 14a and the movement axis 14b. Further, by passing two axes, the moving axis 14a and the moving axis 14b, through the sensor section 3, the inclination of the sensor section 3 is regulated.

Note that the mechanism that allows the sensor section 3 to move in the arrangement direction of the wire ropes 2 is not limited to the mechanism using the moving shafts 14a and 14b described above. For example, the sensor section 3 may be movable in the arrangement direction of the wire ropes 2 by using a linear guide. More specifically, a block may be attached to the sensor section 3 side, and then guide rails may be provided in place of the moving shafts 14a and 14b, so that the sensor section 3 can move along the guide rails. The movement of the sensor part 3 may be made smoother by adding an oil-free bush such as a metal bush or a ball bush to the hole in the sensor part 3. Furthermore, protrusions may be provided in the sensor portion 3 instead of holes, and holes may be provided in the intermediate portions 16a and 16b in place of the moving shafts 14a and 14b. The sensor section 3 can also be made movable by passing the projections provided on the sensor section 3 through the holes provided in the intermediate section 16a and the intermediate section 16b. In this way, various known moving mechanisms can be used as a mechanism that allows the sensor section 3 to move in the direction in which the wire ropes 2 are arranged.

The longitudinal axis 15a passes through a hole provided in the intermediate portion 16a. One end in the axial direction of the front-rear shaft 15a is supported by a base portion 17a. Similarly, the longitudinal axis 15b also passes through a hole provided in the intermediate portion 16a. One end in the axial direction of the front-rear shaft 15b is supported by the base portion 17a. According to such a configuration, the sensor section 3 becomes movable along the longitudinal axis 15a and the longitudinal axis 15b, and the inclination of the sensor section 3 is regulated.

Note that the mechanism that allows the sensor section 3 to move in the direction toward and away from the wire rope 2 is not limited to the one using the front-rear shaft 15a and the front-rear shaft 15b. Various known moving mechanisms can be used for the mechanism that allows the sensor section 3 to move toward and away from the wire rope 2.

The shapes of the intermediate portion 16a and the intermediate portion 16b are designed according to the configurations of the moving shaft 14a, the moving shaft 14b, the longitudinal axis 15a, and the longitudinal axis 15b. As an example, the intermediate portion 16a and the intermediate portion 16b each have a U-shape. The moving shaft 14a is arranged so as to connect the ends of the U-shaped intermediate portion 16a. Similarly, the moving shaft 14b is arranged so as to connect the ends of the U-shaped intermediate portion 16b. Furthermore, a hole is provided in the center of the U-shaped intermediate portion 16a to allow the front and rear shaft 15a to pass therethrough. A hole is provided in the center of the U-shaped intermediate portion 16b to allow the longitudinal shaft 15b to pass therethrough. As an example, the intermediate portion 16a and the intermediate portion 16b are each formed in a line-symmetrical shape.

A connecting portion 20 is provided on the base portion 17a that supports one end of the front-rear shaft 15a and one end of the front-rear shaft 15b. The connecting portion 20 is a portion for connecting the receiving surface portion 19a. The base portion 17a is fixed to some structure and plays a role in fixing the entire position of the wire rope flaw detection device 1a. For example, when the wire rope 2 is a wire rope for an elevator, a beam provided in the vicinity of the wire rope 2 corresponds to the certain structure.

One end of the spring 18a is in contact with the base portion 17a. The opposite end of the spring 18a is in contact with the intermediate portion 16a. Similarly, one end of the spring 18b is in contact with the base portion 17a. The opposite end of spring 18b is in contact with intermediate portion 16b. The spring 18a and the spring 18b play a role of pressing the sensor part 3 against the wire rope 2 via the intermediate part 16a and the intermediate part 16b. Note that the spring 18a and the spring 18b may be arranged coaxially with the longitudinal axis 15a and the longitudinal axis 15b as in the illustrated example, or may be arranged at a different location from the longitudinal axis 15a and the longitudinal axis 15b. .

The receiving surface portion 19a connected to the connecting portion 20 of the base portion 17a has the role of receiving the pressing force from the springs 18a and 18b. The receiving surface portion 19a is installed so as to come into contact with all the wire ropes 2 arranged. The receiving surface portion 19a may have a planar shape that makes line contact with all of the wire ropes 2, or may have a U-shaped notch that matches the diameter of the wire ropes 2, for example. In the latter case, the receiving surface portion 19a and the wire rope 2 come into surface contact.

The connection location between the receiving surface portion 19a and the connecting portion 20 is provided outside the movement range of the sensor portion 3. The receiving surface portion 19a is configured to be easily attached to and detached from the base portion 17a. For example, the connecting portion 20 of the base portion 17a and the receiving surface portion 19a are fixed with screws. Here, if the screws used to fix the receiving surface part 19a are butterfly bolts, clamp levers, etc., the receiving surface part 19a can be attached and removed without using any tools. With this example, the workability when using the wire rope flaw detection device 1a can be further improved.

Furthermore, in order to ensure flaw detection accuracy, it is important to have reproducibility of the position of the receiving surface portion 19a when the receiving surface portion 19a is attached to the base portion 17a. Therefore, for example, a positioning pin 21 may be provided on the connecting portion 20, and a hole corresponding to the positioning pin 21 may be provided on the receiving surface portion 19a side. The positioning pin 21 and the hole can ensure positional repeatability of the receiving surface portion 19a. Note that even if the positioning pin 21 is provided on the receiving surface portion 19a side and the hole is provided on the connecting portion 20 side, the position reproducibility of the receiving surface portion 19a can be similarly ensured.

With the wire rope flaw detection device 1a configured as described above, the wire rope 2 can be sandwiched between the sensor section 3 and the receiving surface section 19a. Thereby, the influence of vibration of the wire rope 2 is reduced, and the relative positional relationship between the sensor section 3 and the wire rope 2 is maintained. Furthermore, by sandwiching the wire rope 2 between the sensor section 3 and the receiving surface section 19a, it is possible to prevent the wire rope 2 from bending and escaping. With the wire rope flaw detection device 1a according to this embodiment, it is possible to obtain the effect of improving flaw detection accuracy. Further, the connection location between the receiving surface portion 19a and the base portion 17a is outside the range in which the sensor portion 3 moves along the movement axis 14a and the movement axis 14b. The sensor section 3 is configured to be movable relative to the receiving surface section 19a. Therefore, all the wire ropes 2 arranged in the array can be tested for flaws without removing the receiving surface portion 19a. According to the present embodiment, it is possible to obtain a wire rope flaw detection apparatus 1a that can accurately perform flaw detection on a plurality of wire ropes arranged in a shorter working time.

Further, the wire rope flaw detection device 1a according to the present embodiment only needs to have at least one magnetic sensor 6. The wire rope flaw detection device 1a does not require a plurality of magnetic sensors 6. Thereby, an increase in the cost of the wire rope flaw detection device 1a and an increase in the total weight of the wire rope flaw detection device 1a can be avoided.

Further, the wire rope flaw detection device 1a according to the present embodiment can press the sensor section 3 against the wire rope 2 by the spring 18a and the spring 18b. Therefore, for example, even if the wire rope 2 vibrates due to a small magnetic force acting between the sensor section 3 and the wire rope 2, the sensor section 3 is moved to the wire rope 2 by the pressing force from the spring 18a and the spring 18b. Follow the movement of. In this embodiment, the relative positional relationship between the wire rope 2 and the sensor section 3 is maintained more reliably by the springs 18a and 18b. This provides the effect of improving flaw detection accuracy. Note that, as a mechanism for pushing the sensor section 3 into the wire rope 2 along the front-rear axis 15a and the front-rear axis 15b, an air cylinder or an electric shaft, for example, may be provided in place of the springs 18a and 18b.

Next, a flaw detection method for the wire rope 2 using the wire rope flaw detection device 1a will be described with reference to a flowchart. FIG. 6 is a flowchart showing a flaw detection method for the wire rope 2 according to the first embodiment.

When performing flaw detection on the wire rope 2, first, the wire rope flaw detection device 1a is attached to the wire rope 2 (step S1), and the wire rope 2 is measured (step S2). After that, if there is still a wire rope 2 to be measured (step S3), after releasing the pressing (step S4), moving the sensor part (step S5), and pressing (step S6), the next wire rope 2 is to be measured. Measurement (step S2) is performed. After repeating each of the above steps until the measurement of all wire ropes 2 is completed (step S3), removal is performed (step S7).

In "attachment" in step S1, first, the attachment part 5 with the sensor part 3 and receiving surface part 19a removed is attached to the structure. Then, the sensor section 3 is attached after adjusting its position so that it is in contact with the wire rope 2. Thereafter, the receiving surface portion 19a is attached to the base portion 17a of the attachment portion 5.

"Measurement" in step S2 is to perform flaw detection by running the wire rope 2 against the wire rope flaw detection device 1a. The flaw detection is completed when all the sections of the wire rope 2 to be measured pass through the wire rope flaw detection device 1a. Here, by running the wire rope 2 in the opposite direction to make the wire rope 2 reciprocate, or by running the wire rope 2 in the same direction multiple times, the section to be measured can be It may be made to pass twice. Thereby, flaw detection accuracy can be improved.

The first "attachment" and "measurement" correspond to the first step of the wire rope flaw detection method according to the present disclosure. The first step is a step in which the first wire rope 2 is sandwiched between the sensor section 3 and the receiving surface section 19a and the first wire rope 2 is measured by the wire rope flaw detection device 1a.

"Release of pressing" in step S4 is to release the sensor section 3 from the wire rope 2. Specifically, by compressing the spring 18a and the spring 18b, the sensor part 3, the moving shaft 14a, the moving shaft 14b, the intermediate part 16a, and the intermediate part 16b are moved along the front-back axis 15a and the front-back axis 15b to the base part 17a. Move it in the direction closer to . At this time, each member needs to be moved at least to a position where the sensor section 3 can move along the movement axis 14a and the movement axis 14b.

"Moving the sensor section" in step S5 is to move the sensor section 3 along the movement axis 14a and the movement axis 14b so that the position of the sensor section 3 and the position of the wire rope 2 to be measured next are aligned. . “Moving the sensor unit” corresponds to the second step of the wire rope flaw detection method according to the present disclosure. The second step is a step executed after the first step. The second step is a step in which the sensor section 3 is moved in the arrangement direction of the wire ropes 2 with respect to the receiving surface section 19a, and the sensor section 3 is moved to the position of the second wire rope 2.

"Pushing" in step S6 is to bring the sensor section 3 moved by "sensor section movement" in step S5 into contact with the wire rope 2 to be measured next. "Pushing" is performed by releasing compressed springs 18a and 18b.

The "pressing" and the "measurement" performed again after the "pressing" correspond to the third step of the wire rope flaw detection method according to the present disclosure. The third step is a step executed after the second step. The third step is a step in which the second wire rope 2 is sandwiched between the sensor section 3 and the receiving surface section 19a and the second wire rope 2 is measured by the wire rope flaw detection device 1a.

In the "removal" of step S7, which is carried out last, first, the receiving surface portion 19a is removed. Thereafter, components other than the receiving surface portion 19a are removed from the structure.

According to the flaw detection procedure shown in this embodiment, all of the plurality of wire ropes 2 arranged in the array can be measured without removing the receiving surface part 19a midway.

Further, FIG. 7 is a perspective view showing a wire rope flaw detection apparatus 1b according to a first modification of the first embodiment. In this first modified example, the arrangement of the moving axis, the front-rear axis, and the spring in the above embodiment is reversed.

Specifically, as shown in FIG. 7, the wire rope flaw detection device 1b includes a moving axis 14c, a moving axis 14d, a front-back axis 15c, a front-back axis 15d, an intermediate portion 16c, an intermediate portion 16d, and a base portion 17b. . The front and rear axes 15c and 15d are passed through holes provided in the sensor section 3. One end of the front-rear shaft 15c is attached to the intermediate portion 16c, and one end of the front-rear shaft 15d is attached to the intermediate portion 16d. A hole is provided in each of the intermediate portion 16c and the intermediate portion 16d. The moving shaft 14c passes through a hole in the intermediate portion 16c, and the moving shaft 14d passes through a hole in the intermediate portion 16d. Both ends of the moving shaft 14c and both ends of the moving shaft 14d are fixed to the base portion 17b. According to this modification, the intermediate portion 16c and the intermediate portion 16d can be made smaller and lighter than the intermediate portion 16a and the intermediate portion 16b. With the wire rope flaw detection device 1b according to this modification, workability can be further improved.

FIG. 8 is a perspective view showing a wire rope flaw detection device 1c according to a second modification of the first embodiment. In FIG. 8, reference numerals are omitted for elements that are the same as those in FIGS. 1 and 2.

In the second modification shown in FIG. 8, the receiving surface portion 19b is configured by rotatable rollers 22a and 22b. According to this modification, the influence of wear caused by the wire rope 2 sliding on the receiving surface portion 19b can be reduced. According to this modification, the mechanical life of the wire rope 2 and the receiving surface portion 19b can be extended.

FIG. 9 is a perspective view showing a wire rope flaw detection device 1d according to a third modification of the first embodiment. FIG. 10 is a perspective view showing a state in which the wire rope flaw detection device 1d according to the third modification of the first embodiment is attached to the wire rope 2. As shown in FIG. In FIGS. 9 and 10, symbols are omitted for elements that are the same as those in FIGS. 1 and 2.

As shown in FIGS. 9 and 10, the wire rope flaw detection device 1d according to this modification includes comb teeth 23a and comb teeth 23b as restraining members that restrict the movement of the wire ropes 2 in the arrangement direction. Comb teeth 23a and 23b are attached to base portion 17a. As many U-shaped notches 24 as there are wire ropes 2 are formed at the tips of the comb teeth 23a and 23b, each having a diameter larger than the diameter of the wire ropes 2. The comb teeth 23a and the comb teeth 23b are configured to continue restraining the wire rope 2 within the notch 24. According to this modification, even if the sensor section 3 is once separated from the wire rope 2 when changing the wire rope 2 to be inspected, the wire rope 2 is moved when the sensor section 3 is pressed against the wire rope 2 again. It's easy to grasp. According to this modification, it is possible to improve workability when changing the wire rope 2 that is the target of flaw detection. Note that the restraining member according to the present disclosure is not limited to the comb teeth 23a and the comb teeth 23b in which the U-shaped notches 24 are formed. The restraining member can have any shape and structure. For example, the shape of the cutout 24 may be a rectangular shape, a circular shape, or the like.

The wire rope flaw detection device and wire rope flaw detection method according to the present disclosure can be used, for example, to detect damaged parts of wire ropes used in elevators, hoists, cranes, and the like.

1a Wire rope flaw detection device, 1b Wire rope flaw detection device, 1c Wire rope flaw detection device, 1d Wire rope flaw detection device, 2 Wire rope, 3 Sensor section, 4 Protective cover, 5 Mounting section, 6 Magnetic sensor, 7 Back yoke, 8a Permanent magnet; 8b permanent magnet; 9a magnetic pole piece; 9b magnetic pole piece; Shaft, 15a front-rear axis, 15b front-rear axis, 15c front-rear axis, 15d front-rear axis, 16a intermediate part, 16b intermediate part, 16c intermediate part, 16d intermediate part, 17a base part, 17b base part, 18a spring, 18b spring, 19a receiver Surface portion, 20 Connection portion, 21 Positioning pin, 22a Roller, 22b Roller, 23a Comb teeth, 23b Comb teeth, 24 Notch

Claims (10)

a sensor unit having a magnetizer that magnetizes a wire rope; and a magnetic sensor that detects leakage magnetic flux generated by a damaged portion of the wire rope;
a movement axis that allows the sensor unit to move in the direction in which the plurality of wire ropes are arranged;
a guide shaft that guides the sensor section in a direction away from the wire rope;
a receiving surface portion facing the sensor portion with the wire rope sandwiched therebetween;
Equipped with
The sensor section is pressed against the wire rope along the guide shaft,
The moving shaft allows the sensor section to move with respect to the receiving surface section ,
The wire rope flaw detection device is characterized in that the receiving surface portion is in contact with a plurality of the wire ropes . The wire rope flaw detection device according to claim 1, wherein the receiving surface portion is in contact with the plurality of wire ropes corresponding to a movement range in which the sensor portion moves by the movement axis. further comprising a base portion to which the guide shaft is attached,
The wire rope flaw detection device according to claim 1 or 2, wherein the receiving surface portion is removable from the base portion. The wire rope flaw detection device according to claim 3, wherein a connection point between the receiving surface portion and the base portion is provided outside the movement range of the sensor portion. The wire rope flaw detection device according to any one of claims 1 to 4, further comprising a spring that generates a force that presses the sensor section against the wire rope along the guide shaft. The wire rope flaw detection device according to claim 5 , wherein the moving shaft allows the sensor section to move relative to the spring. The wire rope flaw detection device according to any one of claims 1 to 6 , wherein the receiving surface portion is constituted by a rotatable roller. The wire rope flaw detection device according to any one of claims 1 to 7 , further comprising a restraining member that restrains movement of the wire rope in the arrangement direction with respect to the sensor section. The wire rope flaw detection device according to claim 8 , wherein the restraining member is a comb tooth in which a plurality of U-shaped notches are formed. a sensor unit having a magnetizer that magnetizes a wire rope; and a magnetic sensor that detects leakage magnetic flux generated by a damaged portion of the wire rope;
a receiving surface portion that contacts the plurality of wire ropes and faces the sensor portion with the wire ropes sandwiched therebetween;
A wire rope flaw detection method using a wire rope flaw detection device equipped with
a first step of sandwiching the first wire rope between the sensor section and the receiving surface section and measuring the first wire rope;
After the first step, a second step of moving the sensor section in the direction in which the wire ropes are arranged relative to the receiving surface section to a second position of the wire rope;
After the second step, a third step of sandwiching the second wire rope between the sensor section and the receiving surface section and measuring the second wire rope;
A wire rope flaw detection method comprising:

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