JP2010256110A - Rope tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rope tester enabling stable measurement by suppressing the vibration of a rope. <P>SOLUTION: A pair of guide rollers 41 and 42 and a pair of guide rollers 43 and 44 are provided so as to hold a pair of the respective permanent magnets 11 and 12 opposed to a wire rope W in between: when the wire rope W is relatively moved with respect to the permanent magnets 11 and 12, the guide rollers 41-44 are rotated to guide the wire rope W and control the positional relation of the permanent magnets 11 and 12 to prevent the excessive contact of the wire rope W and a guide cover 50. Since the guide rollers 42 and 43 are provided between the permanent magnets 11 and 12 to support the wire rope W in a short span, the vibration of the wire rope W is suppressed, so that a change in the magnetic flux of the wire rope W is stably detected by a detection coil 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rope tester that detects damage to ropes such as wire ropes used in elevators, hoists, cranes, and the like.

  As a conventional rope tester, the wire rope is passed through the U-shaped groove of the probe, the wire rope is magnetized by a magnet, and the detection sensor provided in the probe detects the damage of the wire rope from the change in the magnetic flux generated in the wire rope. What to do is known. In this case, the guide sensor is disposed on both sides of the detection sensor in the direction of movement of the wire rope so as to support the wire rope, and is not brought into contact with the U-shaped groove of the probe through which the wire rope passes. (For example, refer to Patent Document 1).

Japanese Patent Laying-Open No. 2005-195472 (paragraph number 0008 and FIG. 1)

A rope tester equipped with such a guide roller has a gap between the wire rope as a rope and the detection sensor so that they do not contact each other (exactly, a guide cover is provided between them). The gap is provided so that the wire rope does not contact the guide cover), and the gap is secured by the guide rollers on both sides of the detection sensor supporting the wire rope. In this case, when the tension of the wire rope is low as in the case of no load, the wire rope is bent by the magnetic attractive force of the magnet that magnetizes the wire rope, and the sliding resistance increases by contacting the U-shaped groove of the probe. There is a problem that detection error occurs due to vibration caused by sliding of the wire rope, and stable measurement cannot be performed.
The present invention has been made to solve the above-described problems, and an object thereof is to obtain a rope tester capable of performing stable measurement while suppressing rope vibration.

In the rope tester according to the present invention, a rope tester for inspecting a rope having a magnetizing device, a detection sensor, and a position regulating device,
The magnetizing apparatus has a magnet having a pair of magnetic poles provided in a direction that is spaced in a predetermined direction and that intersects the predetermined direction,
The detection sensor is disposed between a pair of magnetic poles,
The position restricting device includes a pair of position restricting members that are disposed so as to sandwich each of the pair of magnetic poles from a predetermined direction and restrict the relative position between the rope and the pair of magnetic poles.
A magnetic flux generated in the rope by the pair of magnetic poles when the pair of magnetic poles are opposed to the rope is detected by a detection sensor.

The present invention is a rope tester for inspecting a rope having a magnetizing device, a detection sensor, and a position regulating device,
The magnetizing apparatus has a magnet having a pair of magnetic poles provided in a direction that is spaced in a predetermined direction and that intersects the predetermined direction,
The detection sensor is disposed between a pair of magnetic poles,
The position restricting device includes a pair of position restricting members that are disposed so as to sandwich each of the pair of magnetic poles from a predetermined direction and restrict the relative position between the rope and the pair of magnetic poles.
Since the detection sensor detects the magnetic flux generated in the rope by the pair of magnetic poles when the pair of magnetic poles are opposed to the rope,
A rope tester capable of performing stable measurement while suppressing the vibration of the rope can be obtained.

It is a block diagram which shows the structure of the rope tester which is Embodiment 1 of this invention. It is a perspective view which shows the guide plate in a rope tester. It is a schematic diagram which shows typically the support state of a wire rope. It is another schematic diagram which shows typically the support state of a wire rope. It is a principal part block diagram which shows the structure of the principal part of the rope tester which is Embodiment 2. FIG.

Embodiment 1 FIG.
1 to 4 show Embodiment 1 for carrying out the present invention. FIG. 1 is a block diagram showing the configuration of a rope tester. FIG. 1 (a) shows a rope tester. FIG. 1B is a plan view, and FIG. 1C is a side view. FIG. 2 is a perspective view of the guide plate, FIG. 3 is a schematic diagram schematically showing the support state of the wire rope, and FIG. 4 is another schematic diagram schematically showing the support state of the wire rope. In FIG. 1, a rope tester inspects the presence or absence of damage by a magnetic flux generated by magnetizing a wire rope W, and is configured as follows. In this embodiment, the wire rope is formed by twisting together six strands of several tens of steel wires in multiple layers around the core rope at a predetermined pitch. The support base 2 includes support plates 4 and 5. The magnetizing device 10 is fixed to the support base 2. The magnetizing device 10 has two permanent magnets 11 and 12 and a yoke 13. The permanent magnets 11 and 12 are of the same specification, have a rectangular parallelepiped shape, are magnetized, and have both positive and negative magnetic poles at both ends in the vertical direction in FIG.

  The left permanent magnet 11 is arranged so that the positive magnetic pole side is located on the upper side in FIG. The right permanent magnet 12 is arranged so that the negative magnetic pole side is located on the upper side in FIG. In the two permanent magnets 11 and 12, the negative magnetic pole side of the permanent magnet 11 and the positive magnetic pole side of the permanent magnet 12 are magnetically coupled by a yoke 13. That is, the permanent magnets 11 and 12 forming a pair of positive and negative magnetic poles according to the present invention have a predetermined interval in the left-right direction in FIG. 1A, which is a predetermined direction. The guide roller and the detection coil 21 are provided at intervals where they can be installed, and are projected from the yoke 13 upward in FIG. 1A, which is a direction intersecting the predetermined direction. As a U-shaped magnetic circuit. In this embodiment, for example, the rope tester moves relative to the wire rope W in the direction of the arrow A. In other words, the wire rope W moves in the direction of arrow B relative to the rope tester.

  In the central portion between the permanent magnet 11 and the permanent magnet 12, a detection coil 21 as a detection sensor is fixedly supported on the yoke 13 via a support block 22 made of a nonmagnetic material. On the outer side of the permanent magnet 11 and the permanent magnet 12 in the left-right direction in FIG. 1A, that is, on the opposite side to the detection coil 21 side, support columns 31 and 32 each having a U-shaped deeply recessed groove are formed on the support base 2. Is fixed. A guide plate 50 for guiding the wire rope W by the support columns 31 and 32 (see FIGS. 1A and 1C, not shown in FIG. 1B to avoid complication, details will be described later). Is supported. First and second guide rollers 41 and 42 are provided as position restricting members and rotating rollers with the left permanent magnet 11 sandwiched from the left and right direction of FIG. The right permanent magnet 12 is sandwiched from the left and right directions in FIG. 1A, and third and fourth guide rollers 43 and 44 are provided as position restricting members and rotating rollers. The first to fourth guide rollers 41 to 44 are rotatably supported from left and right by support plates 4 and 5 of the support base 2 as shown in FIG.

  The first and fourth guide rollers 41 and 44 on the side opposite to the detection coil 21 side of the permanent magnets 11 and 12 have the same specifications, and are shown in FIGS. As shown in c), a U-shaped concave portion is provided at the center of the cylindrical portion, and has a drum-like shape whose diameter decreases toward the center in the axial direction. And it is rotatably supported by the support plates 4 and 5 of the support base 2 and rotates in contact with the wire rope W having a circular cross section to regulate the relative position between the wire rope W and the permanent magnets 11 and 12 and the detection coil 21. While guiding the wire rope W. The diameters of the first and fourth guide rollers 41 and 44 are larger than the diameters of the second and third guide rollers 42 and 43. This is because a larger load than that of the second and third guide rollers 42 and 43 can be supported. The second and third guide rollers 42 and 43 have cylindrical outer peripheral surfaces, and are rotatably supported by the support plates 4 and 5 of the support base 2 with the detection coil 21 therebetween. The second and third guide rollers 42 and 43 are both made of a nonmagnetic material, here nonmagnetic stainless steel.

  As shown in FIG. 2, the guide plate 50 is formed with a deep U-shaped groove for guiding the wire rope W, and the magnetizing device 10, the detection coil 21, the second and third guide rollers 42, 43 are connected to each other. 1A is provided so as to cover from above, and a window is provided in the vicinity of the second and third guide rollers 42 and 43, and the second and third guide rollers 42 and 43 are provided from the window. 1 protrudes upward in FIG. 1A so as to be in contact with the wire rope W.

  The rope tester configured as described above includes the first and second guide rollers 41 and 42 and the third and fourth guides sandwiching the permanent magnet 11 and the permanent magnet 12 from the relative movement direction B of the wire rope W. The rollers 43 and 44 are provided to guide the wire rope W while restricting the relative positions of the wire rope W and the rope tester, particularly the permanent magnets 11 and 12 and the detection coil 21. At this time, the first to fourth guide rollers are arranged at equal intervals (a = b = c) in the relative movement direction of the wire rope W as shown by the support points S1 to S4 in FIG. In the case where it is supported at a location, vibration of a low-order frequency is likely to occur when the wire rope W is guided. On the other hand, as shown by the support points S11 to S14 in FIG. 4, they are arranged so as to be supported at unequal intervals (b is smaller than a and c), or b is larger than a and c although not shown. If it arrange | positions in this way, since the vibration frequency of the wire rope W will change, a low-order vibration can be suppressed. Therefore, the noise of the detection signal due to the vibration of the wire rope W can be further suppressed, and a more stable measurement can be performed.

  By providing guide rollers on both sides of the movement direction of the respective wire ropes of the permanent magnets 11 and 12 so that the wire ropes W can be supported, the bending of the wire ropes W attracted by the magnetic attractive force of the permanent magnets 11 and 12 is supported. And the variation in the distance between the wire rope W and the detection coil 21 can be reduced. Thereby, the vibration of the wire rope W at the time of a measurement can be suppressed, the detection signal of the detection coil 21 is stabilized, and detection accuracy is improved. Moreover, since the wire rope W does not contact the guide plate with a strong force, the sliding resistance of the wire rope W can be reduced. Therefore, the burden of work can be reduced when measuring by moving the rope tester while pressing it against the wire rope W by hand.

Embodiment 2. FIG.
FIG. 5 is a main part configuration diagram showing a main part of the rope tester according to the second embodiment. In FIG. 5, an enclosure member 61 that surrounds the outer periphery of the second and third guide rollers 42 and 43 in a U shape is provided, and the support plates 4 and 5 that support the guide rollers 42 and 43 and the enclosure member 61 A grease box 62 is formed as a housing portion. When the wire rope W is relatively moved in the direction of arrow B or in the opposite direction, the grease adheres to the second guide roller 42 or the third guide roller 42 when the wire rope W has grease attached thereto. To do. The adhered grease is peeled off and stored in the grease box 62. If the grease box is not provided, the grease attached to the guide rollers 42 and 43 may peel off and move toward the detection coil 21 and adhere to the detection coil 21, but this can be prevented. Note that the grease accumulated in the grease box 62 is periodically removed.

Embodiment 3 FIG.
In the second embodiment, the grease is prevented from adhering to the detection coil 21 by providing the grease box 62, but the detection coil 21 is covered with resin or molded so as not to enter the inside. Also good. In this case, the grease box 62 may not be provided.

Embodiment 4 FIG.
In the embodiment of FIG. 1, two guide rollers, that is, second and third guide rollers are provided between the permanent magnets 11 and 12. However, when the yoke 13 is long and there is an arrangement space, a guide is further provided. A roller may be added. In this case, since the yoke 13 is long, the bending of the wire rope W increases. By increasing the support points, the bending and the vibration caused by the bending can be suppressed.

Embodiment 5 FIG.
In the above embodiments, the outer peripheral surfaces of the second and third guide rollers 42 and 43 have been shown as flat cylinders. However, like the first and fourth guide rollers 41 and 44, The surface of the second and third guide rollers 42 and 43 may be provided with arc-shaped or V-shaped grooves. In this case, similar to the first and fourth guide rollers 41 and 44, the wire rope W can be supported also from the direction orthogonal (crossing) to the relative movement direction, so that the wire rope W is bent or bent. Can be more effectively suppressed.
In addition, in each above embodiment, although it showed about the case where it is a wire rope, even if it is a string-like rope etc., there exists the same effect.

10 magnetizing device, 11, 12 permanent magnet, 21 detection coil, 22 support block,
41-44 1st-4th guide roller, 45,46 support member,
62 Grease box.

Claims (5)

A rope tester for inspecting a rope having a magnetizing device, a detection sensor, and a position regulating device,
The magnetizing apparatus includes a magnet having a pair of magnetic poles provided in a direction that is spaced in a predetermined direction and that protrudes in a direction that intersects the predetermined direction.
The detection sensor is disposed between the pair of magnetic poles,
The position restricting device includes a pair of position restricting members arranged to sandwich each of the pair of magnetic poles from the predetermined direction and restricting a relative position between the rope and the pair of magnetic poles,
A rope tester for detecting, by the detection sensor, a magnetic flux generated in the rope by the pair of magnetic poles when the pair of magnetic poles are opposed to the rope. The rope tester according to claim 1, wherein the position restricting members are arranged so as not to have the same interval. The rope moves relative to the pair of magnetic poles in the length direction of the rope,
3. The position restricting member is a rotating roller, and rotates while being in contact with the rope to restrict the relative position between the rope and the pair of magnetic poles. The rope tester described in 1. 4. The rotating roller on the opposite side of the pair of magnetic poles from the detection sensor has a diameter larger than the diameter of the rotating roller inside the pair of magnetic poles. Rope tester. The rope tester according to any one of claims 2 to 4, further comprising an accommodating portion surrounding the rotating roller located inside the pair of magnetic poles.

Images