JPS5852527Y2 - Tube flaw detection equipment - Google Patents
Tube flaw detection equipmentInfo
- Publication number
- JPS5852527Y2 JPS5852527Y2 JP2445179U JP2445179U JPS5852527Y2 JP S5852527 Y2 JPS5852527 Y2 JP S5852527Y2 JP 2445179 U JP2445179 U JP 2445179U JP 2445179 U JP2445179 U JP 2445179U JP S5852527 Y2 JPS5852527 Y2 JP S5852527Y2
- Authority
- JP
- Japan
- Prior art keywords
- flaw detection
- eddy current
- current flaw
- head
- detection head
- 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.)
- Expired
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Pipeline Systems (AREA)
Description
【考案の詳細な説明】 本考案は管体の探傷装置に関する。[Detailed explanation of the idea] The present invention relates to a tube flaw detection device.
渦流探傷ヘッドを走行させて例えば鋳鉄管のクラックを
検査する場合、渦流探傷ヘッドと鋳鉄管との間のギャッ
プが変動した時に、粋に渦流探傷ヘッドの検出面が鋳鉄
管の被検出面に対して平行的に変動するのではなく、検
出面が被検出面に対して回動する如く変動した時に、あ
るいは渦流探傷ヘッドが管端面を越えた時に、偽すの検
出出力を発生して測定ミスをすることがある。For example, when running an eddy current flaw detection head to inspect for cracks in a cast iron pipe, when the gap between the eddy current flaw detection head and the cast iron pipe changes, the detection surface of the eddy current flaw detection head will move against the detected surface of the cast iron pipe. When the detection surface rotates relative to the surface to be detected instead of fluctuating in parallel, or when the eddy current flaw detection head crosses the pipe end surface, a false detection output is generated and measurement errors occur. Sometimes I do.
本考案はかかる測定ミスのない渦流探傷装置を提供する
もので、以下その一実施例を図面に基づいて説明する。The present invention provides an eddy current flaw detection device free from such measurement errors, and one embodiment thereof will be described below with reference to the drawings.
第１図は探傷装置の正面図、第２図はその側面図を示す
。FIG. 1 shows a front view of the flaw detection device, and FIG. 2 shows a side view thereof.
第１図および第２図において、１は被検査用の鋳鉄管２
に沿い、その軸心方向に移動可能に設けられた装置本体
で、鋳鉄管２の約半周を覆うように構成され、その内周
面に鋳鉄管２０周方向に並べられた複数個の渦流探傷ヘ
ッド３が設けられ、隣接する渦流探傷ヘッド３は第３図
のヘッド展開図に示されるようにその端部が互いにオー
バーラツプするように本体移動方向前後に千鳥状に配置
されている。In Figures 1 and 2, 1 is a cast iron pipe 2 to be inspected.
The main body of the device is movable in the axial direction along the axis of the pipe, and is configured to cover approximately half the circumference of the cast iron pipe 2, and has a plurality of eddy current flaw detectors lined up in the circumferential direction of the cast iron pipe 2 on its inner peripheral surface. A head 3 is provided, and adjacent eddy current flaw detection heads 3 are arranged in a staggered manner in the direction of movement of the main body so that their ends overlap each other, as shown in the exploded view of the head in FIG.
これによう複数個の渦流探傷ヘッド３を本体１の移動と
共にイ方向に走行させた場合、鋳鉄管２の約半周に発生
したクラックはすべてカバーされることになる。When a plurality of eddy current flaw detection heads 3 are moved in the A direction along with the movement of the main body 1 in this way, all the cracks that have occurred around half the circumference of the cast iron pipe 2 will be covered.
また前記渦流探傷ヘッド３０走行方向前後にそれぞれ複
数のガイドローラ４が装置本体１の内面から突出して設
けられ、該ガイドローラ４が鋳鉄管２０表面に接当する
ことによって渦流探傷ヘッド３と鋳鉄管２とのギャップ
が規制される。Further, a plurality of guide rollers 4 are provided in front and rear of the traveling direction of the eddy current flaw detection head 30, respectively, protruding from the inner surface of the device main body 1, and the guide rollers 4 are brought into contact with the surface of the cast iron pipe 20, so that the eddy current flaw detection head 3 and the cast iron pipe The gap with 2 is regulated.
第４図は１つの渦流探傷ヘッド３の検出部の構成を示し
、渦流探傷ヘッド３０走行方向イに配置された３個のコ
イル５．６．７からなり１中夫の駆動コイル６０走行方
向イの前後に誘導コイル５およびＴが配設され、それぞ
れの誘導コイル５゜Ｉは駆動コイル６に一部オーバーラ
ツプしてｊ？ｐ。FIG. 4 shows the configuration of the detection section of one eddy current flaw detection head 3, which consists of three coils 5, 6, and 7 arranged in the running direction of the eddy current flaw detection head 30, and one middle drive coil 60 in the running direction. Induction coils 5 and T are disposed before and after the induction coil 5, and each induction coil 5°I partially overlaps the drive coil 6. p.
かつ差動的に直列接続されて出力電圧が取９出される。They are differentially connected in series and the output voltage is taken out.
いま駆動コイル６に交流を流した場合、鋳鉄管２０表面
に渦電流が発生し、誘導コイル５゜１はクラックによっ
て渦電流の流れ方が変化した時にこれを検知して検知信
号を発生する。When an alternating current is applied to the drive coil 6, an eddy current is generated on the surface of the cast iron pipe 20, and the induction coil 5.1 detects the change in the flow of the eddy current due to a crack and generates a detection signal.
またこの検出信号は、渦流探傷ヘッド３の誘導コイル５
゜Ｉに平行な検出面３ａが鋳鉄管２表面の被検出面２ａ
に対して回動する如く変動した場合、例えば前記ガイド
ローラ４の一方が凹凸の激して鋳鉄管２の凸部に乗り上
げた場合にも発生することがある。Further, this detection signal is transmitted to the induction coil 5 of the eddy current flaw detection head 3.
The detection surface 3a parallel to ゜I is the detection surface 2a on the surface of the cast iron pipe 2.
This may also occur if the guide rollers 4 rotate against the surface of the cast iron pipe 2, for example, when one of the guide rollers 4 rides on a convex portion of the cast iron pipe 2 due to severe unevenness.
さらには前記検出信号は渦流探傷ヘッド３が鋳鉄管２の
管端面２ｂを越えた場合にも発生する。Furthermore, the detection signal is also generated when the eddy current flaw detection head 3 passes over the pipe end surface 2b of the cast iron pipe 2.
第５図は渦流探傷ヘッドの要部の構成とその動作を説明
するブロック図を示し、渦流探傷ヘッド３に、その走行
方向前端部訃よび後端部にそれぞれ距離センサー８釦よ
び９が組み込１れている。FIG. 5 shows a block diagram illustrating the configuration and operation of the main parts of the eddy current flaw detection head. Distance sensors 8 and 9 are installed in the eddy current flaw detection head 3 at the front end and rear end of the eddy current flaw detection head 3, respectively. 1 has been written.
距離センサ８，９は例えば容量変化検出器または渦流検
出器で構成され、渦流探傷ヘッド３と鋳鉄管２との間の
ギャップの大きさに比例した出力信号を発生する。The distance sensors 8, 9 are constituted by capacitance change detectors or eddy current detectors, for example, and generate output signals proportional to the size of the gap between the eddy current testing head 3 and the cast iron pipe 2.
両距離センサー８，９の信号は減算器１０に人力され、
その差信号は比較器１１に入力されて基準信号発生器１
２から入力される基準信号のレベルと比較される。The signals from both distance sensors 8 and 9 are input to a subtracter 10,
The difference signal is input to the comparator 11 and the reference signal generator 1
The level of the reference signal input from 2 is compared.
前記差信号が前記基準信号のレベルを越えた時に比較器
１１は出力を発生し、ゲート回路１３を制御する。When the difference signal exceeds the level of the reference signal, the comparator 11 generates an output and controls the gate circuit 13.
一方渦流探傷ヘッド３の検出出力はゲート回路１３に入
力され、比較器１１に出力が現われたときにゲート回路
１３が閉じることによう検出出力の通過は阻止される。On the other hand, the detection output of the eddy current flaw detection head 3 is input to the gate circuit 13, and when the output appears on the comparator 11, the gate circuit 13 closes, thereby blocking the detection output from passing through.
従って、両距離センサー８，９の出力差が所定値に達し
た時、すなわち渦流探傷ヘッド３の検出面３ａが鋳鉄管
２の被検出面２ａに対して所定以上回動した時に、ある
いは渦流探傷ヘッド３が管端面２ｂを越えた時に、渦流
探傷ヘッド３の検出出力はカットされ、たとえ渦流探傷
ヘッド３から偽すの検出出力が発生したとしても該信号
は信号ラインから除去される。Therefore, when the output difference between both distance sensors 8 and 9 reaches a predetermined value, that is, when the detection surface 3a of the eddy current flaw detection head 3 rotates more than a predetermined amount with respect to the detected surface 2a of the cast iron pipe 2, or when the eddy current flaw detection When the head 3 passes over the tube end surface 2b, the detection output of the eddy current flaw detection head 3 is cut off, and even if a false detection output is generated from the eddy current flaw detection head 3, the signal is removed from the signal line.
な釦距離センサー８，９は渦流探傷ヘッド３に間隔をあ
けて取り付けられたが、装置本体１に間隔をあけて取り
付けられてもよい。Although the button distance sensors 8 and 9 are attached to the eddy current flaw detection head 3 with a gap between them, they may be attached to the main body 1 of the apparatus with a gap between them.
またゲート１３を用いて検出出力をカットしたが、渦流
探傷ヘッド３の作動を止めてもよい。Further, although the detection output is cut using the gate 13, the operation of the eddy current flaw detection head 3 may be stopped.
以上本考案によれば、例えばガイドローラの一方が管体
の凸部に乗ジ上げて渦流探傷ヘッドの検出面が管体表面
の被検出面に対して回動する如く変動した時に、あるい
は渦流探傷ヘッドの検出部が管端面を越えた時に、渦流
探傷ヘッドから偽すの検出出力が発生しても、この部分
の検出出力は阻止されて測定ミスを起すことはない。As described above, according to the present invention, when one of the guide rollers rides up on the convex part of the tube body and the detection surface of the eddy current flaw detection head rotates relative to the detection surface of the tube surface, or when the eddy current Even if a false detection output is generated from the eddy current flaw detection head when the detection section of the flaw detection head crosses the tube end surface, the detection output of this portion is blocked and no measurement error occurs.
しかも、検出部のヘッド進行方向両側に設けた距離セン
サーの差信号を所定基準信号と比較するので、特に渦流
探傷ヘッドが前記管長手方向へ回動した場合、該回動を
簡単な構成であシ乍ら、精度よく検出できる。Moreover, since the difference signals of the distance sensors provided on both sides of the detection unit in the direction of head movement are compared with a predetermined reference signal, especially when the eddy current flaw detection head rotates in the longitudinal direction of the pipe, the rotation can be easily controlled. However, it can be detected with high accuracy.
図面は本考案の一実施例を示し、第１図は正面図、第２
図は側面図、第３図は複数の渦流探傷ヘッドの展開図、
第４図は渦流探傷ヘッド検出部の構成図、第５図は渦流
探傷ヘッド要部の構成と動作ヲ説明するブロック図であ
る。
２・・・・・・鋳鉄管、２ａ・・−・・被検出面、２ｂ
・・・・・・管端面、３・・・・・・渦流探傷ヘッド、
３ａ・・・・・・検出面、４・・・・・・ガイドローラ
、８，９・・・・・・距離センサ。The drawings show one embodiment of the present invention, with Figure 1 being a front view and Figure 2 being a front view.
The figure is a side view, and Figure 3 is a developed view of multiple eddy current flaw detection heads.
FIG. 4 is a configuration diagram of the eddy current flaw detection head detection section, and FIG. 5 is a block diagram illustrating the configuration and operation of the main parts of the eddy current flaw detection head. 2...Cast iron pipe, 2a...Detected surface, 2b
...Pipe end face, 3...Eddy current flaw detection head,
3a...Detection surface, 4...Guide roller, 8, 9...Distance sensor.
Claims (1)
探傷ヘッドと管体との間のギヤツブ巾を検出する距離セ
ンサーをそれぞれ設け、両距離センサーの差信号が所定
基準信号のレベルを越えた時に渦流探傷ヘッドの検出出
力を阻止する手段を設けたことを特徴とする管体の探傷
装置。Distance sensors are installed on both sides of the detection section of the eddy current flaw detection head in the direction of head movement to detect the gear tooth width between the eddy current flaw detection head and the pipe body, and when the difference signal between both distance sensors exceeds the level of a predetermined reference signal, A flaw detection device for a tubular body, characterized in that it is provided with means for blocking the detection output of an eddy current flaw detection head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2445179U JPS5852527Y2 (en) | 1979-02-26 | 1979-02-26 | Tube flaw detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2445179U JPS5852527Y2 (en) | 1979-02-26 | 1979-02-26 | Tube flaw detection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55123858U JPS55123858U (en) | 1980-09-02 |
| JPS5852527Y2 true JPS5852527Y2 (en) | 1983-11-30 |
Family
ID=28862955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2445179U Expired JPS5852527Y2 (en) | 1979-02-26 | 1979-02-26 | Tube flaw detection equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5852527Y2 (en) |
-
1979
- 1979-02-26 JP JP2445179U patent/JPS5852527Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55123858U (en) | 1980-09-02 |
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