JP5368491B2 - Output confirmation method and output confirmation device for wire rope flaw detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of easily confirming the output from a magnetic detection unit of a wire rope flaw detection device at a site where a wire rope is inspected by the wire rope flaw detection device. <P>SOLUTION: An output confirmation method of a wire rope flaw detection device 1 includes: when confirming the output from a detection coil 3 constituting a magnetic detection unit of the wire rope flaw detection device 1, using a round pipe 10 made of a nonmagnetic material as a rod-like body mounted on a wire rope installation portion 5 of the wire rope flaw detection device 1; mounting the round pipe 10 on the wire rope installation portion 5 such that the round pipe 10 is vertically erected; in this state, inserting a spherical magnetic body 11 into the round pipe 10 and allowing free fall of the spherical magnetic body 11; and based on a signal detected from the detection coil 3 at this time, determining whether the output from the detection coil 3 is normal or abnormal in a determination unit of a terminal device 12. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to an output confirmation method and an output confirmation apparatus for a wire rope flaw detector that detects breakage of a wire rope provided in an elevator or the like.

  In general, a wire rope used in an elevator, a lift, a cable car, a crane, or the like is formed by twisting a plurality of steel wires. In the wire rope, the steel wire constituting the wire rope breaks little by little due to aging fatigue and wear, and such breakage gradually increases. When the number of fractures of the steel wire exceeds the reference value, it is determined that the wire rope has reached the end of its life and needs to be replaced. Therefore, it is necessary to measure whether or not the wire rope has reached the end of its life, that is, whether it can be safely used, by measuring the number of breaks in the steel wire that constitutes the wire rope through periodic wire rope inspection. . In order to diagnose the breakage of such a wire rope steel wire, i.e., an element wire, a magnetic flaw detector by a leakage magnetic flux method is usually used. In this magnetic flaw detector, for example, a wire rope is magnetized in the longitudinal direction using a pair of permanent magnets, and leakage magnetic flux from the steel wire is detected by a magnetic detection unit disposed between the permanent magnets. A breakage is detected (see Patent Document 1).

  In such a magnetic flaw detector, an output confirmation device is used to check whether the output from the magnetic detection unit of the magnetic flaw detector is normal or abnormal. To be implemented. Conventionally as this type of output confirmation device, a rod-shaped body, that is, a steel bar with a hole, is passed through the magnetic detection part of the magnetic flaw detector while rotating in the circumferential direction, and the leakage magnetic flux is detected and output as a signal. There is known an output confirmation device that compares a signal value with a preset reference value to confirm whether the output from the magnetic detection unit is normal or abnormal (see Patent Document 2).

Japanese Utility Model Publication No. 59-195561 JP 2010-160068 A

  The output confirmation device in the prior art disclosed in Patent Document 2 is a large device of about 1 meter square, and it has been difficult to bring it to the site where wire rope inspection is performed together with the wire rope flaw detector. Therefore, conventionally, it has been difficult to confirm whether the output from the magnetic detection unit of the wire rope flaw detector is normal or abnormal at the site where the wire rope inspection is performed. If the wire breakage inspection is performed without confirming the output from the magnetic detection unit, and the abnormality in the output from the magnetic detection unit is confirmed after the inspection, the wire rope breaks again after the output calibration. The inspection will be carried out twice, which will be troublesome twice.

  The present invention has been made from the actual situation in the above-described prior art, and its purpose is to confirm the output from the magnetic detection unit of the wire rope flaw detector at a site where the wire rope is inspected by the wire rope flaw detector. An object of the present invention is to provide an output confirmation method and an output confirmation device for a wire rope flaw detector that can be easily performed.

  In order to achieve the above object, the output confirmation method of the wire rope flaw detector according to the present invention is a state in which a rod-like body corresponding to the wire rope to be inspected is attached to the wire rope installation portion of the wire rope flaw detector. In the output confirmation method of the wire rope flaw detector for confirming whether the output from the magnetic detection unit of the wire rope flaw detector is normal or abnormal, a round pipe made of a non-magnetic material is used as the rod-like body, and the round pipe is It is attached to the wire rope installation portion of the wire rope flaw detector so as to stand upright, and in this state, the spherical magnetic body is inserted into the round pipe to cause the spherical magnetic body to fall freely. Based on a signal output from the magnetic detection unit of the wire rope flaw detector, it is confirmed whether the output from the magnetic detection unit is normal or abnormal.

  In the present invention configured as described above, the shape of the spherical magnetic body that freely falls within the round pipe made of a non-magnetic material is uniform, and the length of the round pipe is the length of the wire rope installation portion of the wire rope flaw detector. Since it can be set to a relatively short constant dimension according to the length dimension, the speed at which the spherical magnetic body passes through the magnetic detection part of the wire rope flaw detector can be made constant. At this time, the signal output from the magnetic detection unit has a waveform that swings up and down like a sine wave. Therefore, by comparing the shape of the waveform according to the signal output from the magnetic detection unit and the reference waveform when the signal output from the magnetic detection unit of the wire rope flaw detector is normal, that is, the reference value, It can be determined whether the output from the magnetic detection unit is normal or abnormal.

  In confirming the normality and abnormality of the output from the magnetic detection unit of such a wire rope flaw detector, the present invention can be set to a relatively short length that can be mounted on the wire rope installation portion of the wire rope flaw detector. Bring a round pipe made of non-magnetic material and a spherical magnetic body that can freely fall inside this round pipe to the site where the wire rope inspection is carried out by the wire rope flaw detector, and magnetic detection of the wire rope flaw detector The output from the unit can be confirmed. That is, it is possible to easily confirm the output from the magnetic detection unit of the wire rope flaw detector at the site where the wire rope inspection is performed by the wire rope flaw detector.

  Further, the output confirmation device of the wire rope flaw detector according to the present invention is mounted on the wire rope installation portion of the wire rope flaw detector so that the round pipe made of a non-magnetic material is erected in the vertical direction. Insert the spherical magnetic body into the round pipe and let the spherical magnetic body fall freely. At this time, based on the signal output from the magnetic detection section of the wire rope flaw detector, the output from the magnetic detection section is normal. In the output confirmation device of the wire rope flaw detector used in the output confirmation method of the wire rope flaw detector for confirming whether it is abnormal or not, the round pipe made of a non-magnetic material is attached to the wire rope installation portion of the wire rope flaw detector. And the spherical magnetic body that is inserted into the round pipe and can freely fall, and is connected to the wire rope flaw detector. A signal output from the magnetic detection unit of the wire rope flaw detector when the magnetic material is freely dropped is input, the signal value is compared with a preset reference value, and output from the magnetic detection unit And a terminal device having a determination unit for determining whether the device is normal or abnormal.

  According to the present invention configured as described above, the signal output from the magnetic detection unit of the wire rope flaw detector when the spherical magnetic body is freely dropped in the round pipe made of a non-magnetic material in the determination unit of the terminal device. The value is compared with a preset reference value. When the signal value corresponds to the reference value, it is determined to be normal, and when the signal value is out of the reference value, it is determined to be abnormal.

  Here, normally, at the time of inspection of the wire rope, a terminal device such as a personal computer equipped with a display unit or the like is connected to the wire rope flaw detector and the inspection of the wire rope is performed. Therefore, the terminal device used for this wire rope inspection can be utilized as a terminal device provided with the determination unit of the present invention.

  For this reason, when confirming the output from the magnetic detection unit of the wire rope flaw detector, the present invention can set a relatively short length dimension that can be attached to the wire rope installation unit of the wire rope flaw detector. Bring a round pipe made of magnetic material and a spherical magnetic body that can freely fall inside this round pipe to the site where the wire rope inspection is carried out by the wire rope flaw detector, and the magnetic detection part of the wire rope flaw detector The output from can be confirmed. That is, it is possible to easily confirm the output from the magnetic detection unit of the wire rope flaw detector at the site where the wire rope inspection is performed by the wire rope flaw detector.

  An output confirmation method and an output confirmation device for a wire rope flaw detector according to the present invention bring a round pipe made of a non-magnetic material and a spherical magnetic material to a site where the wire rope flaw detector is used, and wire rope flaw detection. The output from the magnetic detection unit of the apparatus can be easily confirmed. As a result, the output confirmation operation of the magnetic detection unit of the wire rope flaw detector can be performed more easily than before, which contributes to improving the efficiency of the wire rope inspection operation.

It is a figure explaining one Embodiment of the output confirmation method and output confirmation apparatus of the wire rope flaw detector which concerns on this invention. It is a perspective view which shows the round pipe and spherical magnetic body which comprise one Embodiment of the output confirmation apparatus used for one Embodiment of the output confirmation method which concerns on this invention. It is the figure which showed typically the determination method in the determination part of the terminal device with which one Embodiment of the output confirmation apparatus which concerns on this invention is equipped. It is a figure which shows the wire rope flaw detector to which one Embodiment of the output confirmation method and output confirmation apparatus which concern on this invention is applied.

  Embodiments of an output confirmation method and an output confirmation device for a wire rope flaw detector according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 4, the wire rope flaw detector 1 to which the output confirmation method and the output confirmation apparatus according to this embodiment are applied is arranged between a pair of permanent magnets 2a and 2b and the permanent magnets 2a and 2b. The detection coil 3, that is, the magnetic detection unit, is arranged in the longitudinal direction of the detected wire rope 7. The permanent magnets 2a and 2b and the detection coil 3 are fixed to a base 4 made of a magnetic material. On the opposite side of the pace 4, a wire rope installation portion 5 to which the wire rope 7 to be inspected is attached is provided so that the permanent magnets 2 a and 2 b are in contact with each other.

  When the wire rope 7 is inspected, the magnetic path 6 passes through the permanent magnet 2 a, the wire rope 7, the permanent magnet 2 b, and the base 4 when the wire rope 7 is attached to the wire rope installation portion 5 as shown in FIG. Is formed. As a result, a signal is output from the detection coil 3 constituting the magnetic detection unit. In accordance with a signal output from the detection coil 3, it is determined whether or not the wire rope 7 attached to the wire rope installation portion 5 has broken the steel wire. When the wire rope 7 is inspected, the wire rope 7 may be inspected by moving the wire rope 7 in the longitudinal direction of the wire rope flaw detector 1, and the wire rope flaw detector in the longitudinal direction of the wire rope 7. The inspection may be performed by moving 1. Although not shown in FIG. 4, a terminal device such as a personal computer is normally connected to the wire rope flaw detector 1, and a predetermined calculation is performed according to a signal from the detection coil 3 input to the terminal device. In addition, predetermined items are displayed on the display unit.

  FIG. 1 is a diagram for explaining an embodiment of an output confirmation method and an output confirmation device for a wire rope flaw detector according to the present invention, and FIG. 2 is an example of an output confirmation device used in an embodiment of an output confirmation method according to the present invention. The perspective view which shows the round pipe and spherical magnetic body which comprise embodiment, FIG. 3 is the figure which showed typically the determination method in the determination part of the terminal device with which one Embodiment of the output confirmation apparatus which concerns on this invention is equipped. is there.

  The output confirmation method of the wire rope flaw detector 1 according to the present embodiment is to confirm the output by attaching a rod-shaped body corresponding to the wire rope 7 to the wire rope installation part 5 of the wire rope flaw detector 1. A round pipe 10 made of a non-magnetic material is used as a rod-like body, and the round pipe 10 is mounted on the wire rope installation section 5 of the wire rope flaw detector 1 so as to stand up and down. A spherical magnetic body 11 is inserted into the spherical magnetic body 11 to freely fall, and at this time, based on a signal output from the magnetic detection unit of the wire rope flaw detector 1, that is, the detection coil 3, It confirms whether the output is normal or abnormal.

  The output confirmation device of the wire rope flaw detector according to this embodiment used in the output confirmation method of such a wire rope flaw detector 1 has an outer diameter equivalent to that of the wire rope 7 to be inspected as shown in FIG. The above-described round pipe 10 made of a non-magnetic material and set to a length of about 20 cm, for example, has an outer diameter substantially equal to the inner diameter of the round pipe 10, and falls freely within the round pipe 10 without receiving resistance. The above-described spherical magnetic body 11 is provided.

  As shown in FIG. 1, the output confirmation device according to the present embodiment is connected to the wire rope flaw detector 1, and when the spherical magnetic body 11 is freely dropped in the round pipe 10, the wire rope flaw detector 1. The magnetic detection unit, that is, the signal output from the detection coil 3 is input, and the signal value is compared with a preset reference value to determine whether the output from the detection coil 3 is normal or abnormal. A terminal device 12 is provided. As the terminal device 12, a terminal device such as a personal computer connected to the wire rope flaw detector 1 can be used. That is, the output confirmation device according to the present embodiment normally uses a terminal device 12 such as a personal computer connected to the wire rope flaw detector 1 and the terminal device 12 is provided with the above-described determination unit.

  As schematically shown in FIG. 3, the determination unit of the terminal device 12 includes the upper reference range 23 and the lower reference range 24 as the reference value set in advance, that is, the reference value at which the output is considered normal. And are set. As shown in FIG. 3, the output from the detection coil 3 can be understood as a waveform such as a sine wave that swings up and down across the waveform center 20, that is, a waveform having an upper chord wave 21 and a lower chord wave 22. Therefore, in the determination unit of the terminal device 12, whether the upper end of the upper chord wave 21 corresponding to the signal output from the detection coil 3 is within the upper reference range 23, and the lower end of the lower chord wave 22 is the lower reference range. By judging whether or not it is within the range 24, it is possible to determine whether the output from the detection coil 3 is normal or abnormal.

  When confirming the output from the detection coil 3 of the wire rope flaw detector 1, the round pipe 10 is mounted so as to stand on the wire rope installation portion 5 of the wire rope flaw detector 1 as described above. The magnetic body 11 is inserted into the round pipe 10 from the upper end of the round pipe 10 and freely dropped. Thus, since the spherical magnetic body 11 that freely falls in the round pipe 10 has a uniform shape and the length of the round pipe 10 is constant, the portion of the detection coil 3 of the wire rope flaw detector 1 is spherical. The speed when the magnetic body 11 passes is constant. As a result, the signal output from the detection coil 3 forms a waveform that swings up and down like a sine wave, that is, a waveform having the upper chord wave 21 and the lower chord wave 22 as described above.

  In the determination unit of the terminal device 12, as shown in FIG. 3A, the upper end of the cosine wave 21 in the signal waveform output from the detection coil 3 exists within the upper reference range 23, and the lower limit When it is confirmed by calculation that the lower end of the wave 22 is within the lower reference range 24, the output from the detection coil 3 is determined to be normal.

  As shown in FIG. 3B, the upper end of the upper chord wave 21 of the signal waveform output from the detection coil 3 exceeds the upper reference range 23, and the lower end of the lower limit wave 22 is the lower reference range. When it is confirmed by calculation that the value exceeds 24, the output from the detection coil 3 is determined to be abnormal.

  Also, as shown in FIG. 3C, the upper end of the upper chord wave 21 of the signal waveform output from the detection coil 3 does not reach the upper reference range 23, and the lower end of the lower limit wave 22 is the lower reference. When it is confirmed by calculation that the range 24 is not reached, the output from the detection coil 3 is determined to be abnormal.

  Each determination result is displayed on a display unit (not shown) of the terminal device 12, for example. An operator who confirms the output from the detection coil 3 looks at the determination result displayed on the display unit of the terminal device 12 and determines whether the output of the detection coil 3 is normal or abnormal. When the determination result is normal, the wire rope 7 can be inspected immediately by the wire rope flaw detector 1. If the determination result is abnormal, the wire rope 7 is inspected by the wire rope flaw detector 1 after performing a calibration operation to normalize the output of the detection coil 3.

  According to the output confirmation method and output confirmation device of the wire rope flaw detector according to this embodiment described above, when confirming the output from the detection coil 3 of the wire rope flaw detector 1, the wire rope installation unit 5 of the wire rope flaw detector 1. The wire rope flaw detector 1 includes a round pipe 10 made of a non-magnetic material set to a comparatively short length dimension that can be attached to a round pipe 10 and a spherical magnetic body 11 that can freely fall inside the round pipe 10. The output from the detection coil 3 of the wire rope flaw detector 1 can be easily confirmed. Thereby, the output check operation of the detection coil 3 can be easily performed, which contributes to an improvement in the efficiency of the flaw detection operation of the wire rope 7.

DESCRIPTION OF SYMBOLS 1 Wire rope flaw detector 2a Permanent magnet 2b Permanent magnet 3 Detection coil (magnetic detection part)
5 Wire rope installation part 10 Round pipe 11 Spherical magnetic body 12 Terminal device 21 Upper chord wave 22 Lower chord wave 23 Upper reference range 24 Lower reference range

Claims (2)

A wire rope for checking whether the output from the magnetic detection unit of the wire rope flaw detector is normal or abnormal in a state in which a rod-shaped body corresponding to the wire rope to be inspected is attached to the wire rope installation part of the wire rope flaw detector. In the method for checking the output of the flaw detector,
A round pipe made of a non-magnetic material is used as the rod-like body, and the round pipe is installed in the wire rope installation portion of the wire rope flaw detector so as to stand up and down. Insert the spherical magnetic body and let the spherical magnetic body fall freely, and based on the signal output from the magnetic detection section of the wire rope flaw detector at this time, whether the output from the magnetic detection section is normal or abnormal A method for confirming the output of a wire rope flaw detector characterized by confirming the above. A round pipe made of non-magnetic material is set up in the vertical direction so that it is mounted on the wire rope installation portion of the wire rope flaw detector. In this state, the spherical magnetic material is inserted into the round pipe and the spherical magnetic material is It is used for the output confirmation method of the wire rope flaw detector that allows it to fall freely and confirm whether the output from the magnetic detector is normal or abnormal based on the signal output from the magnetic detector of the wire rope flaw detector at this time In the output confirmation device of the wire rope flaw detector,
The round pipe mounted on the wire rope installation portion of the wire rope flaw detector and made of a non-magnetic material,
The spherical magnetic body that is inserted into this round pipe and can fall freely;
A signal output from the magnetic detection unit of the wire rope flaw detector when the spherical magnetic body is freely dropped in the round pipe is connected to the wire rope flaw detector, and the signal value is set in advance. And a terminal device having a determination unit for determining whether the output from the magnetic detection unit is normal or abnormal as compared with a reference value to be output.

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