JPH0368834A - Method and apparatus for inspecting looseness of screw - Google Patents
Method and apparatus for inspecting looseness of screwInfo
- Publication number
- JPH0368834A JPH0368834A JP1205061A JP20506189A JPH0368834A JP H0368834 A JPH0368834 A JP H0368834A JP 1205061 A JP1205061 A JP 1205061A JP 20506189 A JP20506189 A JP 20506189A JP H0368834 A JPH0368834 A JP H0368834A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- vibration
- acceleration
- screws
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 238000007689 inspection Methods 0.000 claims description 10
- 230000001133 acceleration Effects 0.000 abstract description 15
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001845 vibrational spectrum Methods 0.000 description 1
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はネジで部材を結合して構成された構造体におけ
るネジゆるみの検査を行う方法及び装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for inspecting screw loosening in a structure constructed by connecting members with screws.
〔従来の技術］
従来、構造体の製造工程において、ネジで部材を結合す
る際、ネジの締め忘れが発生している。[Prior Art] Conventionally, in the manufacturing process of a structure, when members are connected with screws, it has occurred that the screws have been forgotten to be tightened.
そして、多数のネジで構成された装置では検査時に各ネ
ジを再度締めてチエツクする方法が取られている。また
、検査時にハンマー等で装置の機構部に影響を与えない
程度の衝撃を加え、ネジの脱落をチエツクすることによ
り、ネジの締め付は不良の検査が行われている。For devices constructed with a large number of screws, a method is used in which each screw is retightened and checked during inspection. In addition, during inspection, screws are inspected for poor tightening by applying an impact with a hammer or the like to an extent that does not affect the mechanism of the device and checking for screws coming off.
〔発明が解決しようとする課題］
上述した方法では、ネジの締め付は不良のチエツクに手
間がかかり、また、ハンマーによるチエツクでは脱落し
ないゆるんだネジは検出できないという問題がある。[Problems to be Solved by the Invention] The above-described method has the problem that it takes time and effort to check for defects when tightening screws, and that loose screws that do not fall off cannot be detected by checking with a hammer.
本発明の目的は前記課題を解決したネジゆるみの検査方
法及び装置を提供することにある。An object of the present invention is to provide a screw loosening inspection method and apparatus that solve the above problems.
前記目的を達成するため、本発明に係るネジゆるみの検
査方法においては、ネジで部材を結合して構成された構
造体に振動を入力し、該構造体の振動を計測するもので
ある。In order to achieve the above object, in the screw loosening inspection method according to the present invention, vibrations are input to a structure formed by connecting members with screws, and the vibrations of the structure are measured.
また、本発明に係るネジゆるみの検査装置においては、
構造体にランダム振動を加える装置と、該構造体の振動
を検出する装置と、該振動の周波数スペクトルを測定す
る装置とを有するものである。Furthermore, in the screw loosening inspection device according to the present invention,
It has a device that applies random vibrations to a structure, a device that detects the vibrations of the structure, and a device that measures the frequency spectrum of the vibrations.
（イ乍用］
構造体に機械振動を加えると、構造体には加振周波数及
びその高調波、さらには固有振動数の振動等が励起され
る。そして、励起される振動の周波数成分とレベルは、
構造体各部の結合状態により変化する。それゆえ、構造
体に振動を入力し、結合部近傍の振動を検出することに
より、結合部の状態を知ることができる。ネジにより結
合された部材を有する構造体においては、ネジ部の振動
がネジの結合状態により変化し、振動の周波数成分の変
化としてネジの状態を検出できる。(For use) When mechanical vibration is applied to a structure, vibrations at the excitation frequency, its harmonics, and natural frequencies are excited in the structure.The frequency components and levels of the excited vibrations are teeth,
It changes depending on the connection state of each part of the structure. Therefore, by inputting vibration to the structure and detecting the vibration near the joint, the state of the joint can be known. In a structure having members connected by screws, the vibration of the screw portion changes depending on the connection state of the screws, and the condition of the screw can be detected as a change in the frequency component of the vibration.
Ｃ実施例３
以下、本発明の実施例を図面を参照して詳細に説明する
。C Embodiment 3 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
（実施例１） 第１図は本発明の実施例１を示す図である。(Example 1) FIG. 1 is a diagram showing a first embodiment of the present invention.
図において、構造体フレーム６に部材６ａをネジ結合し
てフレーム６の表面側に現れたネジｌの左右にアクチュ
エータ２と加速度センサ３を取付け、ノイズジェネレー
タ５よりＯ〜５０ ｋ Ｈｚのランダム波の振動を構造
体フレーム６に入力し、振動加速度を加速度センサによ
り検出し、ＦＦＴアナライザ４により周波数スペクトル
を測定する。第２図（ａ）はネジが締まった状態を、ま
た第２図（ロ）はネジがゆるんだ状態をそれぞれ加速度
スペクトルで示す図である。第２図（ａ）に示すように
ネジが締まった状態では、６ｋＨｚ以上の周波数に主な
振動成分を持つが、第２図（ロ）に示すようにネジがゆ
るむと、低周波の振動レベルが大きくなることがわかる
。この方法により、結合部のネジについて同様の測定を
行ったところ、低周波領域の振動加速度がいずれも増大
し、ネジのゆるみを検出できることがわかった・
（実施例２）
製品の製造検査工程で使用する装置としてのネジのゆる
みの検査装置を第３図に示す。In the figure, a member 6a is screwed to a structural frame 6, an actuator 2 and an acceleration sensor 3 are attached to the left and right of a screw l that appears on the surface side of the frame 6, and a random wave of 0 to 50 kHz is generated from a noise generator 5. Vibrations are input into the structure frame 6, vibration acceleration is detected by an acceleration sensor, and a frequency spectrum is measured by an FFT analyzer 4. FIG. 2(a) is an acceleration spectrum diagram showing a state in which the screw is tightened, and FIG. 2(b) is a diagram showing a state in which the screw is loosened. As shown in Figure 2 (a), when the screw is tightened, the main vibration component is at a frequency of 6 kHz or higher, but when the screw is loosened, as shown in Figure 2 (b), the vibration level is lower at low frequencies. It can be seen that becomes larger. Using this method, we performed similar measurements on the screws in the joints and found that the vibration acceleration in the low frequency range increased in all cases, making it possible to detect loosening of the screws. (Example 2) In the product manufacturing inspection process The screw looseness inspection device used is shown in FIG.
図において、図示しない製品をフレーム９にネジ結合し
てフレーム９の表面側に現われたネジ７−１〜７−４の
近傍に加速度センサ８−１〜８−４をそれぞれ取付け、
アクチュエータ２より、ノイズジェネレータ１０を用い
て０〜５０ｋｔ（ｚのランダム振動をフレーム９に入力
する。そして、ネジ７−１〜７−４の近傍に取付けた加
速度センサ８−１〜８−４で振動加速度を検出する。こ
れらの振動は、スイッチ部１１で順番に測定し、ＦＦＴ
アナライザ１２で振動スペクトルを求める。そして、パ
ーソナルコンピュータ１３で、予め記憶させた正常状態
のスペクトルパターンと比較し、正常、異常の判断を行
う。この方法により、ネジゆるみの検査が必要となるネ
ジを予め設定しておき、−度に複数個のネジを検査でき
る。また、第４図に示すようにネジのゆるみを検査すべ
きフレーム２０に、加速度センサ１５−１〜１５−４を
予め取付けたセンサパネル１４を押しあてて加速度セン
サ１５−１〜１５−４をフレーム２０の各ネジ１９〜ｌ
、 ＋９−２．・・・の近傍に設置し、センサパネル１
４に開口した窓１６から、先端に磁石＋７を取付けたア
クチュエータ■８をフレーム２０に取付けて検査するこ
とにより複数のセンサを取付ける手間をはぶくことが可
能となる。In the figure, a product (not shown) is screwed to the frame 9, and acceleration sensors 8-1 to 8-4 are respectively attached near the screws 7-1 to 7-4 appearing on the surface side of the frame 9.
From the actuator 2, a random vibration of 0 to 50 kt (z) is input to the frame 9 using the noise generator 10.Then, the acceleration sensors 8-1 to 8-4 installed near the screws 7-1 to 7-4 Detect vibration acceleration.These vibrations are sequentially measured by the switch unit 11, and are subjected to FFT.
A vibration spectrum is obtained using the analyzer 12. Then, the personal computer 13 compares it with a pre-stored normal state spectrum pattern to determine whether it is normal or abnormal. With this method, screws that need to be inspected for screw loosening are set in advance, and a plurality of screws can be inspected at one time. Further, as shown in FIG. 4, the sensor panel 14 on which the acceleration sensors 15-1 to 15-4 are attached in advance is pressed against the frame 20 to be inspected for looseness of the screws. Each screw 19~l of frame 20
, +9-2. Installed near sensor panel 1.
By attaching the actuator 8, which has a magnet +7 attached to its tip, to the frame 20 for inspection through the window 16 opened at 4, it becomes possible to eliminate the trouble of attaching a plurality of sensors.
以上説明したように本発明はネジがゆるんだ場合の構造
体の振動パターンの変化を利用してネジゆるみの検査を
行うことにより、−度に複数のネジのチエツクができ、
かつ、検査もれの少ないネジゆるみの検査を行うことが
できる効果を有する。As explained above, the present invention makes it possible to check multiple screws at the same time by inspecting for screw loosening using changes in the vibration pattern of the structure when a screw is loosened.
In addition, it has the effect of being able to inspect screw loosening with fewer inspection omissions.
第１図は本発明の一実施例を示す構成図、第２図（ａ）
、（ロ）は加速度スペクトルを示す図、第３図。
第４図は本発明の他の実施例を示す構成図である。
１．７−１〜７−４．１９−１．１９−２・・・ネジ２
．１８・・・アクチュエータ
３．８−１〜８−４．１５−１−１５−４・・・加速度
センサ４．１２・・・ＦＦＴアナライザ
５．１０・・・ノイズジェネレータ ６．９．２０・
・・フレーム１１・・・スイッチ部 １３・・・パー
ソナルコンピュータ１４・・・センサパネル
１６・・・窓１７・・・磁石
第
１
図
周波委史 （Ｋ日Ｘ）
（ｂ）
第２図Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2(a)
, (b) is a diagram showing an acceleration spectrum, FIG. FIG. 4 is a block diagram showing another embodiment of the present invention. 1.7-1 to 7-4.19-1.19-2...Screw 2
．． 18... Actuator 3.8-1 to 8-4.15-1-15-4... Acceleration sensor 4.12... FFT analyzer 5.10... Noise generator 6.9.20.
...Frame 11...Switch section 13...Personal computer 14...Sensor panel
16...Window 17...Magnet Figure 1 Frequency committee history (K day X) (b) Figure 2
Claims (2)
入力し、該構造体の振動を計測することを特徴とするネ
ジゆるみの検査方法。(1) A method for inspecting screw loosening, which comprises inputting vibrations to a structure formed by connecting members with screws and measuring the vibrations of the structure.
の振動を検出する装置と、該振動の周波数スペクトルを
測定する装置とを有することを特徴とするネジゆるみの
検査装置。(2) A screw loosening inspection device comprising a device that applies random vibrations to a structure, a device that detects vibrations of the structure, and a device that measures the frequency spectrum of the vibrations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205061A JPH0368834A (en) | 1989-08-08 | 1989-08-08 | Method and apparatus for inspecting looseness of screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205061A JPH0368834A (en) | 1989-08-08 | 1989-08-08 | Method and apparatus for inspecting looseness of screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0368834A true JPH0368834A (en) | 1991-03-25 |
Family
ID=16500789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1205061A Pending JPH0368834A (en) | 1989-08-08 | 1989-08-08 | Method and apparatus for inspecting looseness of screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0368834A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6229234B1 (en) | 1997-06-16 | 2001-05-08 | Hydro-Quebec | Rotating electric motor system capable of vibrating and method for operating a rotating electric motor capable of vibrating |
| US8429990B2 (en) | 2008-10-09 | 2013-04-30 | HGST Netherlands B.V. | Top cover screw floating checker system for hard disk |
| JP5307948B1 (en) * | 2013-03-27 | 2013-10-02 | 大宮工業株式会社 | Anchor bolt abnormality detection system |
| JP2016003915A (en) * | 2014-06-16 | 2016-01-12 | 株式会社沢田テクニカルサービス | Inspection method and inspection device |
| CN107084838A (en) * | 2017-05-25 | 2017-08-22 | 合肥美亚光电技术股份有限公司 | Part interference detection method, device and the application of a kind of electromagnetic vibrator |
| CN107989880A (en) * | 2017-12-13 | 2018-05-04 | 柳州上丰自动化设备有限公司 | A kind of butterfly bolt that can inform abjection state in real time |
| CN108050144A (en) * | 2017-12-13 | 2018-05-18 | 柳州上丰自动化设备有限公司 | A kind of screw |
| CN108088546A (en) * | 2017-12-03 | 2018-05-29 | 中国直升机设计研究所 | Amplifier terminals loosen recognition methods under a kind of rotor platform working speed state |
| CN108106827A (en) * | 2017-12-03 | 2018-06-01 | 中国直升机设计研究所 | A kind of rotor platform rises amplifier terminals under rotary regimes and loosens recognition methods |
| JP2019152538A (en) * | 2018-03-02 | 2019-09-12 | 大成建設株式会社 | Fastening bolt fastening torque specifying device and fastening torque specifying method |
| JP2020201220A (en) * | 2019-06-13 | 2020-12-17 | 株式会社東芝 | Diagnostic device, diagnostic method, and diagnostic system |
-
1989
- 1989-08-08 JP JP1205061A patent/JPH0368834A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6229234B1 (en) | 1997-06-16 | 2001-05-08 | Hydro-Quebec | Rotating electric motor system capable of vibrating and method for operating a rotating electric motor capable of vibrating |
| US6384549B2 (en) | 1997-06-16 | 2002-05-07 | Hydro-Quebec | Rotating electric motor system capable of vibrating and method for operating a rotating electric motor capable of vibrating |
| US8429990B2 (en) | 2008-10-09 | 2013-04-30 | HGST Netherlands B.V. | Top cover screw floating checker system for hard disk |
| JP5307948B1 (en) * | 2013-03-27 | 2013-10-02 | 大宮工業株式会社 | Anchor bolt abnormality detection system |
| JP2016003915A (en) * | 2014-06-16 | 2016-01-12 | 株式会社沢田テクニカルサービス | Inspection method and inspection device |
| CN107084838A (en) * | 2017-05-25 | 2017-08-22 | 合肥美亚光电技术股份有限公司 | Part interference detection method, device and the application of a kind of electromagnetic vibrator |
| CN108088546A (en) * | 2017-12-03 | 2018-05-29 | 中国直升机设计研究所 | Amplifier terminals loosen recognition methods under a kind of rotor platform working speed state |
| CN108106827A (en) * | 2017-12-03 | 2018-06-01 | 中国直升机设计研究所 | A kind of rotor platform rises amplifier terminals under rotary regimes and loosens recognition methods |
| CN107989880A (en) * | 2017-12-13 | 2018-05-04 | 柳州上丰自动化设备有限公司 | A kind of butterfly bolt that can inform abjection state in real time |
| CN108050144A (en) * | 2017-12-13 | 2018-05-18 | 柳州上丰自动化设备有限公司 | A kind of screw |
| JP2019152538A (en) * | 2018-03-02 | 2019-09-12 | 大成建設株式会社 | Fastening bolt fastening torque specifying device and fastening torque specifying method |
| JP2020201220A (en) * | 2019-06-13 | 2020-12-17 | 株式会社東芝 | Diagnostic device, diagnostic method, and diagnostic system |
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