WO2011148456A1 - ワイヤロープ探傷装置 - Google Patents
ワイヤロープ探傷装置 Download PDFInfo
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- WO2011148456A1 WO2011148456A1 PCT/JP2010/058786 JP2010058786W WO2011148456A1 WO 2011148456 A1 WO2011148456 A1 WO 2011148456A1 JP 2010058786 W JP2010058786 W JP 2010058786W WO 2011148456 A1 WO2011148456 A1 WO 2011148456A1
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- WIPO (PCT)
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- wire rope
- magnetic sensor
- magnetizer
- flaw detector
- sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
Definitions
- This invention relates to a wire rope flaw detector for detecting breakage of a wire rope used in an elevator, a construction crane, or the like, or wire breakage (hereinafter referred to as a wire rope damaged portion).
- Patent Document 1 As this kind of wire rope flaw detector, there is one shown in Patent Document 1. This is because a wire rope traveling at a constant speed is magnetized by a permanent magnet or an electromagnet in a predetermined section in the axial direction of the wire rope, and leaked from a damaged portion of the wire rope by a magnetic sensor disposed in the predetermined section. It detects magnetic flux.
- This wire rope flaw detector is a protective plate made of a non-magnetic material having a substantially U-shaped cross section in which a magnetizer composed of a permanent magnet or an electromagnet and a back yoke and a magnetic sensor for detecting leakage magnetic flux substantially wraps around the wire rope. It is in contact with the wire rope through.
- the magnetizer and the magnetic sensor are not in contact with the object to be inspected.
- a wire rope flaw detector includes a magnet plate composed of a magnet and a back yoke, and a magnetic sensor for detecting a magnetic flux leakage, and a protective plate made of a non-magnetic material having a U-shaped cross section that wraps around the wire rope. Via the wire rope.
- Patent Document 2 the leakage magnetic flux density of the damaged portion becomes smaller as the distance from the object to be inspected. Therefore, when the distance between the object to be inspected and the magnetic sensor is increased, the detection sensitivity of the damaged portion is reduced, and the object to be inspected When the distance from the magnetic sensor fluctuates due to vibration of the magnetic sensor, an erroneous detection signal is generated in the magnetic sensor.
- the present invention has been made in view of the above-described problems, and aims to extend the life of the apparatus without impairing the detection sensitivity and S / N of the damaged portion of the wire rope.
- the wire rope flaw detector of the present invention magnetizes a predetermined section in the axial direction of the wire rope with a magnetizer composed of a back yoke and a magnet, and uses a magnetic sensor to detect leakage magnetic flux generated from the damaged portion of the wire rope in the predetermined section.
- the magnetizer for magnetizing the wire rope is disposed in a non-contact manner with respect to the wire rope, and the magnetic sensor is disposed via a protective plate. It is arranged in contact with the wire rope.
- a magnetizer composed of a magnet and a back yoke is disposed in a non-contact manner with respect to the wire rope so as not to generate a frictional force between the wire rope and the magnetizer.
- the magnetic sensor is disposed in contact with the wire rope via the protective plate so that the distance between the magnetic sensor and the wire rope is substantially constant, the detection sensitivity and S / Without impairing N, the wear of the protection plate of the magnetic sensor can be reduced against the wear of the protection plate of the conventional magnetizer, and the life of the device can be extended.
- FIG. 1 is a perspective view of a wire rope flaw detector according to Embodiment 1.
- FIG. 2 It is a block diagram which shows the wire rope flaw detector in Embodiment 2. It is a perspective view of the wire rope flaw detector in Embodiment 2.
- FIG. 1A and 1B are configuration diagrams showing a wire rope flaw detector according to Embodiment 1 of the present invention, in which FIG. 1A is a front view and FIG. 1B is a sectional view taken along line AA in FIG.
- FIG. 2 is an explanatory view showing the detection principle of the wire rope flaw detector according to Embodiment 1, and shows a case where there is no wire rope damaged part.
- FIG. 3 is an explanatory diagram showing the detection principle of the wire rope flaw detector according to Embodiment 1, and shows a case where there is a damaged portion of the wire rope.
- 4 is a perspective view of the wire rope flaw detector according to Embodiment 1.
- FIG. 1A is a front view
- FIG. 1B is a sectional view taken along line AA in FIG.
- FIG. 2 is an explanatory view showing the detection principle of the wire rope flaw detector according to Embodiment 1, and shows a case where there is no wire rope damaged part.
- FIG. 3 is an ex
- the magnetizer 2 is configured such that the wire rope 1 and the magnet cover 4 of the magnet 3 are separated by a predetermined distance (for example, about 5 to 10 mm when the diameter of the wire rope 1 is 10 to 15 mm). It is arranged in a non-contact manner with the rope 1 and magnetizes a predetermined axial section L of the wire rope 1.
- the magnetizer 2 includes a back yoke 6, a pair of magnets 3 disposed at both ends thereof, a magnet cover 4, and other support parts.
- the predetermined section is a predetermined section in the axial direction of the wire rope 1 sandwiched between portions of the wire rope 1 facing NS pairs of permanent magnets or electromagnets disposed at both ends of the back yoke 6 of the magnetizer 2. This is a section indicated by L in FIG.
- the magnet cover 2 In order to prevent breakage of the magnet 3, the magnet cover 2 is provided with the magnet cover 4, but the magnet cover 4 and the wire rope 1 are not in contact with each other. In order to prevent the wire rope 1 from coming into contact with the magnet cover 4 due to the attractive force of the magnet 3, support rollers 5 fixed to the substrate 26 are respectively provided before and after the wire rope 1 in the magnetizer 2 in the axial direction. Yes. Since the support roller 5 corresponds to the wire ropes 1 having different diameters, the support roller 5 may be slid at a fixed position. Further, in order to accommodate wire ropes 1 having different diameters, the magnetizer 2 includes a slide mechanism (guides and screws) between the substrate 26 and the distance between the wire rope 1 and the magnet cover 4 can be adjusted. Good.
- the sensor unit 7 protects the magnetic sensor 8, the iron core 11, the holder 9 that holds the magnetic sensor 8, the magnetic sensor 8 from sliding of the wire rope 1, and the magnetic sensor 8 and the wire rope 1.
- the protective plate 12 and the base plate 25 are maintained in an appropriate positional relationship.
- the most suitable magnetic sensor 8 is a variety of elements such as a search coil, a Hall element, a magnetoresistive effect element (MR, GMR), a magnetoimpedance element (MI), and the accuracy, durability, and cost are examined. Can be selected.
- a magnetic sensor 8 composed of a search coil 10 and an iron core 11 that increases the amount of magnetic flux linked to the search coil 10 is employed. As shown in FIGS.
- the search coil 10 and the iron core 11 have a U-shaped cross section so that the wire rope 1 is substantially half-circumferentially in order to widen the capture range of the damaged portion of the wire rope 19 as much as possible. It is shaped into a shape.
- the protection plate 12 is formed so as to cover the inner periphery of the magnetic sensor 8 in close contact with each other, and is made of a nonmagnetic material such as austenitic stainless steel. The function of the protective plate 12 can be substituted by embedding the magnetic sensor 8 with a resin having a small friction coefficient and forming it in a U shape.
- a pair of end blocks 24 are fixed on a substrate 26, and a lower shaft 23 is fixed between both end blocks 24.
- a lower shaft 23 passes through the slide block 22, and the slide block 22 can slide along the lower shaft 23.
- the lower shaft 23 is provided with a stopper 27 that passes through the lower shaft 23 and is slidable along the lower shaft 23.
- the follow-up mechanism 13 prevents the sensor unit 7 from moving away from the wire rope 1 due to the influence of the vibration of the wire rope 1 and the distance between the magnetic sensor 8 and the wire rope 1 fluctuating and causing the magnetic sensor 8 to erroneously detect.
- the follow-up mechanism 13 is an example of a mechanism using a slide and a spring, and includes a sensor unit stage 20, an upper shaft 21, a slide block 22, a spring 14, a retaining screw 29, and a retaining plate 31.
- the sensor unit 7 is detachably fixed to the sensor unit stage 20 with screws 30 (FIG. 4).
- the upper shaft 21 is embedded and fixed in the sensor unit stage 20, the slide block 22 penetrates slidably, and has a retaining screw 29 and a retaining plate 31 at the tip.
- the upper shaft 21 does not come out of the slide block 22 by the retaining screw 29 and the retaining plate 31.
- a spring 14 is compressed and interposed between the slide block 22 whose sliding range is restricted by the stopper 27 and the sensor unit stage 20
- the sensor unit 7 follows the displacement of the wire rope 1 by the pressing force of the spring 14 and is kept in contact with the wire rope 1. At this time, in order to prevent the protection plate 12 from being worn, it is necessary to keep the spring constant at a necessary and sufficient size and to make sure that the natural frequency does not overlap the frequency of the wire rope 1.
- the spring 14 is an example of a metal spring, but may be an air spring.
- the sensor unit stage 20 and the sensor unit 7 have a structure that can be separated by a screw 30. When inspecting wire ropes 1 having different diameters, the sensor units 7 having different U-shaped cross-sectional dimensions can be used. When the inspection is not performed, the sensor unit 7 can be separated from the wire rope 1 by loosening the set screw 28 and sliding the stopper 27 and sliding the slide block 22 on the lower shaft 23.
- the main magnetic flux 18 generated from one magnet 3 of the magnetizer 2 passes through the wire rope 1, passes through the other magnet 3 of the magnetizer 2 and the back yoke 6, and the one magnet A magnetic circuit returning to 3 is formed.
- the magnetomotive force of the magnetizer 2 is set so that the magnetic flux density in the wire rope 1 reaches approximately magnetic saturation.
- the leakage magnetic flux 16 is generated in the vicinity thereof.
- the leakage magnetic flux 16 passes near the magnetic sensor 8, the amount of magnetic flux in the iron core 11 changes, and an induced voltage is generated at both ends of the search coil 10. Thereby, the presence of the wire rope damaged part 19 can be detected.
- support rollers 5 are installed in the magnetizer 2 before and after the wire rope 1 in the axial direction, the wire rope 1 is pressed by the support rollers 5, and the positional relationship between the magnetizer 2 and the wire rope 1 is maintained at a constant distance without contact. Further, the sensor unit 7 is brought into contact with the wire rope 1 by the follow-up mechanism 13 so that the distance between the magnetic sensor 8 and the wire rope 1 is kept constant.
- the pressing force of the spring 14 is the pressing force when the magnetizer 2 is brought into contact with the wire rope 1 through the protection plate with a strong magnetic flux by the magnetizer 2 as in the prior art. It can be easily set to be smaller than the force. That is, it is easier to make the frictional force that the magnetic sensor 8 contacts the wire rope 1 smaller than the frictional force that the magnetizer 2 contacts the wire rope 1. Therefore, the wear of the protection plate 12 of the magnetic sensor 8 according to the first embodiment can be reduced compared to the wear of the protection plate of the conventional magnetizer 2.
- the magnetizer 2 including the magnet 3 and the back yoke 6 is disposed in a non-contact manner with respect to the wire rope 1, and the wire rope 1 and the magnetizing device are magnetized.
- the magnetic sensor 8 is disposed in contact with the wire rope 1 through the protective plate 12 so that a frictional force is not generated between the devices 2, and the distance between the magnetic sensor 8 and the wire rope 1 is made substantially constant.
- the wear of the protective plate 12 of the magnetic sensor 8 can be reduced without impairing the detection sensitivity and S / N of the damaged portion of the wire rope, and the life of the apparatus can be extended.
- FIG. 5 is a configuration diagram showing the wire rope flaw detector according to the second embodiment.
- FIG. 6 is a perspective view showing a wire rope flaw detector according to the second embodiment.
- the same reference numerals indicate the same or corresponding parts.
- two sets of each constituent element constituting the wire rope flaw detector according to the first embodiment are provided and arranged in a direction opposed to the wire rope 1 by 180 °.
- the stopper 27 near the end block 24 can be slid on the lower shaft 23 and fixed at a desired position.
- the two sets of magnetizers 2 are disposed so as to face each other at 180 ° with respect to the wire rope 1, the uniformity of the magnetic flux distribution in the wire rope 1 is increased.
- the wire rope 1 and the magnet cover 4 of the magnet 3 are separated by a predetermined distance (for example, about 2 to 5 mm when the diameter of the wire rope 1 is 10 to 15 mm), The wire rope 1 is disposed without contact.
- two sets of sensor units 7 are arranged in a direction opposite to each other by 180 ° with respect to the wire rope 1, so that the low sensitivity region of each sensor unit 7, that is, the vicinity of the opening of the U-shaped cross section is damaged by the wire rope.
- the detection sensitivities when the part 19 passes can be supplemented with each other.
- the sensor unit 7 including the magnetic sensor 8 has a U-shaped cross-sectional structure that wraps around the wire rope 1 more than half a circumference
- P sensor units 7 are arranged per wire rope.
- the sensor units 7 are arranged at intervals of 360 / P degrees in the circumferential direction of the wire rope. In this way, by making the cross-sectional shape of the sensor unit 7 U-shaped, it is easy to attach and detach to the wire rope 1, and a wire rope damaged portion occurs in any part in the circumferential direction of the wire rope 1. Even uniform detection sensitivity can be obtained.
- the magnetizers 2 are arranged per wire rope, the magnetizers 2 are arranged at intervals of 360 / Q degrees in the circumferential direction of the wire rope. If it does in this way, the strength of magnetization in wire rope 1 can be brought close to a uniform state about the peripheral direction of wire rope 1, and a wire rope damage part will occur in any part about the peripheral direction of wire rope 1. Even, a uniform leakage magnetic flux can be obtained.
- Various modifications or alterations of the present invention can be realized by a related expert without departing from the scope and spirit of the present invention, and are not limited to the embodiments described in this specification. Should be understood.
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Abstract
Description
この発明の上記以外の目的、特徴、観点及び効果は、図面を参照する以下のこの発明の詳細な説明から、さらに明らかになるであろう。
図1はこの発明の実施の形態1におけるワイヤロープ探傷装置を示す構成図で、その(a)は正面図、その(b)は(a)のA-A線断面図である。図2は実施の形態1におけるワイヤロープ探傷装置の検出原理を示す説明図で、ワイヤロープ損傷部がない場合を示す。図3は実施の形態1におけるワイヤロープ探傷装置の検出原理を示す説明図で、ワイヤロープ損傷部がある場合を示す。図4は実施の形態1に係るワイヤロープ探傷装置の斜視図である。図1~図4において、磁化器2は、ワイヤロープ1と磁石3の磁石カバー4とが所定距離(例えば、ワイヤロープ1の径が10~15mmのとき、5~10mm程度)離間し、ワイヤロープ1と非接触で配設され、ワイヤロープ1の軸方向所定区間Lを磁化する。磁化器2は、バックヨーク6と、その両端に配設された一対の磁石3と、その磁石カバー4と、その他の支持部品で構成される。前記所定区間とは、ワイヤロープ1のうち、磁化器2のバックヨーク6両端に配設されたN-S対の永久磁石又は電磁石に対向する部分で挟まれたワイヤロープ1の軸方向所定区間であり、図1中のLで示される区間である。
実施の形態2に係るワイヤロープ探傷装置について説明する。図5は実施の形態2におけるワイヤロープ探傷装置を示す構成図である。図6は実施の形態2におけるワイヤロープ探傷装置を示す斜視図である。なお、図中、同一符号は同一又は相当部分を示す。実施の形態2では、実施の形態1に係るワイヤロープ探傷装置を構成する各構成要素をそれぞれ2組備え、ワイヤロープ1に関し180°対向させた向きに配設したものである。エンドブロック24の近くにあるスットパ27は、下シャフト23上を摺動して所望位置で固定させることができる。
この発明の各種の変形又は変更は、関連する熟練技術者が、この発明の範囲と精神を逸脱しない中で実現可能であり、この明細書に記載された各実施の形態には制限されないことと理解されるべきである。
Claims (6)
- ワイヤロープの軸方向所定区間を、バックヨークと磁石で構成される磁化器で磁化し、前記所定区間内におけるワイヤロープ損傷部から発生する漏洩磁束を磁気センサで検出して、前記ワイヤロープ損傷部を検出するワイヤロープ探傷装置において、
前記ワイヤロープを磁化する前記磁化器を前記ワイヤロープに対して非接触で配設し、
前記磁気センサを保護プレートを介して前記ワイヤロープと接触させて配設したことを特徴とするワイヤロープ探傷装置。 - 前記磁化器における前記ワイヤロープの軸方向前後に、前記ワイヤローラを支持する支持ローラをそれぞれ配設し、前記磁化器と前記ワイヤローラ間を非接触状態で一定の距離に保持することを特徴とする請求項求1記載のワイヤロープ探傷装置。
- 金属バネ又は空気バネにより、前記磁気センサが保護プレートを介して前記ワイヤロープに押圧されることを特徴とする請求項1又は請求項2記載のワイヤロープ探傷装置。
- 前記磁気センサを含むセンサユニットを交換可能にしたことを特徴とする請求項1~請求項3のいずれか1項に記載のワイヤロープ探傷装置。
- 前記磁気センサを含むセンサユニットが、前記ワイヤロープに対し半周以上包み込むU字状断面構造を有し、前記センサユニットがワイヤロープ1本あたり複数個配設され、前記センサユニットの個数をP個としたとき、前記センサユニットが、前記ワイヤロープの周方向に関し、360/P度の間隔で配設されることを特徴とする請求項1~請求項4のいずれか1項に記載のワイヤロープ探傷装置。
- 前記磁化器がワイヤロープ1本あたり複数個配設され、前記磁化器の個数をQ個としたとき、前記磁化器が前記ワイヤロープの周方向に関し、360/Q度の間隔で配設されることを特徴とする請求項1~請求項5のいずれか1項に記載のワイヤロープ探傷装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2010/058786 WO2011148456A1 (ja) | 2010-05-25 | 2010-05-25 | ワイヤロープ探傷装置 |
KR1020127024481A KR101419629B1 (ko) | 2010-05-25 | 2010-05-25 | 와이어 로프 탐상 장치 |
JP2012517010A JP5528550B2 (ja) | 2010-05-25 | 2010-05-25 | ワイヤロープ探傷装置 |
CN201080060523.5A CN102713597B (zh) | 2010-05-25 | 2010-05-25 | 钢丝绳探伤装置 |
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PCT/JP2010/058786 WO2011148456A1 (ja) | 2010-05-25 | 2010-05-25 | ワイヤロープ探傷装置 |
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JP (1) | JP5528550B2 (ja) |
KR (1) | KR101419629B1 (ja) |
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CN113155951B (zh) * | 2021-05-17 | 2022-12-27 | 中国矿业大学(北京) | 一种永磁体可径向调节的钢丝绳探伤仪 |
EP4119940A1 (en) * | 2021-07-15 | 2023-01-18 | Shimadzu Corporation | Wire rope inspection system and positioning method for wire rope inspection system |
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Also Published As
Publication number | Publication date |
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KR101419629B1 (ko) | 2014-07-15 |
CN102713597A (zh) | 2012-10-03 |
CN102713597B (zh) | 2015-11-25 |
JPWO2011148456A1 (ja) | 2013-07-25 |
JP5528550B2 (ja) | 2014-06-25 |
KR20120123714A (ko) | 2012-11-09 |
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