JPH09304358A - Defect detecting method for lead sheath pipe for electric wire - Google Patents
Defect detecting method for lead sheath pipe for electric wireInfo
- Publication number
- JPH09304358A JPH09304358A JP8140676A JP14067696A JPH09304358A JP H09304358 A JPH09304358 A JP H09304358A JP 8140676 A JP8140676 A JP 8140676A JP 14067696 A JP14067696 A JP 14067696A JP H09304358 A JPH09304358 A JP H09304358A
- Authority
- JP
- Japan
- Prior art keywords
- sheath pipe
- lead sheath
- flaw detection
- ultrasonic
- defect
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば電力ケーブ
ルの鉛シース等の電線用鉛シースパイプ内の異物やボイ
ド等を超音波探触子を用いて検出する方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting foreign matter, voids, etc. in a lead sheath pipe for electric wire such as a lead sheath of a power cable using an ultrasonic probe.
【０００２】[0002]
【従来の技術】従来の技術として、電線用アルミシース
パイプの外側円周上に斜角探傷用超音波探触子を配置
し、該探触子を回転させ発射される超音波により、回転
水流中で上記アルミシースパイプの欠陥を検出する方法
が知られている。即ち、図３に示すように、斜角探傷用
超音波探触子２Ａから発射された超音波が、アルミシー
スパイプ１′の表面１ａ′と裏面１′ｂ間を反射を繰り
返えして伝播してゆき、その途中に欠陥があればその欠
陥からのエコーの高さにより検出していた。2. Description of the Related Art As a conventional technique, an ultrasonic probe for oblique-angle flaw detection is arranged on the outer circumference of an aluminum sheath pipe for electric wire, and the rotating water flow is generated by the ultrasonic waves emitted by rotating the probe. Among them, a method for detecting defects in the aluminum sheath pipe is known. That is, as shown in FIG. 3, the ultrasonic waves emitted from the oblique-angle ultrasonic probe 2A are repeatedly reflected between the front surface 1a 'and the rear surface 1'b of the aluminum sheath pipe 1'. It propagates, and if there is a defect on the way, it is detected by the height of the echo from the defect.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の技術
は、アルミシースパイプのような超音波減衰の小さい材
料で実用化されているか、本発明が対象とする鉛シース
パイプという超音波減衰の非常に大きい（アルミニウム
の10〜30倍の減衰／ａｔ５ＭＨｚ）材質では見逃しが多
く実用されていない。即ち、図４（ロ）に示すように、
鉛シースパイプ１内にラミネート状の欠陥Ａが存在する
場合には、超音波の探触子方向に返る反射が少なく、欠
陥の検出が非常に困難である。しかもこのようなラミネ
ート状の欠陥Ａは鉛シースを押出しにより製造している
関係上実際に発生しやすい。The above-mentioned conventional technique has been put into practical use with a material having a small ultrasonic attenuation, such as an aluminum sheath pipe, or a lead sheath pipe, which is the object of the present invention, has a high ultrasonic attenuation property. Very large (attenuation of 10 to 30 times that of aluminum / at 5MHz) is often overlooked and not used in practice. That is, as shown in FIG.
When the laminate-shaped defect A exists in the lead sheath pipe 1, there is little reflection of ultrasonic waves returning to the probe direction, and it is very difficult to detect the defect. Moreover, such a laminate-like defect A is likely to actually occur because the lead sheath is manufactured by extrusion.
【０００４】上述の問題を解決するための一つの手段と
して、受信感度を電気的に上げることが考えられるが、
この場合は金属組織からの反射（ノイズ）も増幅し、欠
陥とノイズの判別がつきにくくなる。又水中の微小ボイ
ドや異物等も誤検出の要因となる。さらに、かりに金属
組織からのノイズ以外を除去しても、斜角探傷での受信
波は一般的に図５に示すように表面エコーＳにより表面
傍（約１ｍｍ）は探傷不可部分となる。As one means for solving the above problems, it is possible to electrically increase the receiving sensitivity.
In this case, reflection (noise) from the metal structure is also amplified, and it becomes difficult to distinguish between a defect and noise. In addition, minute voids in the water, foreign matter, etc. also cause erroneous detection. Furthermore, even if noise other than the noise from the metallographic structure is removed, the received wave in oblique flaw detection generally becomes a non-detectable portion near the surface (about 1 mm) due to the surface echo S as shown in FIG.
【０００５】[0005]
【課題を解決するための手段】本発明は従来の斜角探傷
による問題点、即ち鉛シースパイプの裏面に近い部分で
の欠陥の形状によっては探傷能力が低下するという問
題、及び鉛シースパイプ表面近傍での探傷が不能となる
問題を解消した電線用鉛シースパイプの欠陥の検出方法
を提供するもので、その特徴は、鉛シースパイプの外側
円周上に斜角探傷用超音波探触子及び垂直探傷用超音波
探触子を配置し、これら超音波探触子を回転させ発射さ
れる超音波により、回転水流中で鉛シースパイプの欠陥
を検出することにあり、さらに上記超音波探触子として
表層斜角探傷用超音波探触子を付加したことにある。DISCLOSURE OF THE INVENTION The present invention has a problem due to the conventional oblique angle flaw detection, that is, the flaw detection ability is lowered depending on the shape of a defect in the portion near the back surface of the lead sheath pipe, and the lead sheath pipe surface. It provides a method for detecting defects in lead sheath pipes for electric wires that solves the problem that flaw detection in the vicinity is not possible. Its feature is an ultrasonic probe for oblique angle flaw detection on the outer circumference of the lead sheath pipe. And ultrasonic probes for vertical flaw detection are arranged, and the ultrasonic waves emitted by rotating these ultrasonic probes are used to detect defects in the lead sheath pipe in a rotating water flow. An ultrasonic probe for surface bevel flaw detection is added as a probe.
【０００６】[0006]
【発明の実施の形態】図１は本発明の電線用鉛シースパ
イプの欠陥検出方法の具体例の説明図、図２は図１の欠
陥検出方法を実現する検出装置の構成図である。図１に
示すように、鉛シースパイプ１の外側円周上に、斜角探
傷用超音波探触子２Ａ、垂直探傷用超音波探触子２Ｂ、
表面斜角探傷用超音波探触子２Ｃを配置し、これら超音
波探触子２Ａ、２Ｂ、２Ｃを鉛シースパイプ１の周りに
回転させながら回転する探傷水３中に超音波を発射し、
上記鉛シースパイプ１からの反射波を受信して鉛シース
パイプ１中の異物、ボイド等を検出する。1 is an explanatory view of a concrete example of a defect detecting method for a lead sheath pipe for electric wire according to the present invention, and FIG. 2 is a block diagram of a detecting apparatus for realizing the defect detecting method of FIG. As shown in FIG. 1, on the outer circumference of the lead sheath pipe 1, an ultrasonic probe 2A for oblique flaw detection, an ultrasonic probe 2B for vertical flaw detection,
An ultrasonic probe 2C for surface-angled flaw detection is arranged, and ultrasonic waves are emitted into the flaw detection water 3 which rotates while rotating these ultrasonic probes 2A, 2B, 2C around the lead sheath pipe 1,
The reflected wave from the lead sheath pipe 1 is received to detect foreign matters, voids and the like in the lead sheath pipe 1.
【０００７】図２において、１は鉛シースパイプ、２は
前述の斜角探傷用超音波探触子２Ａ、垂直探傷用超音波
探触子２Ｂ、表層斜角探傷用超音波探触子２Ｃよりなる
超音波探触子群で、斜角探傷用超音波探触子２Ａは鉛シ
ースパイプ１の中心線と垂直方向に対し左右約30°、垂
直探傷用超音波探触子２Ｂは垂直線上、表層斜角探傷用
超音波探触２Ｃは中心線と垂直方向に対し左右約40°に
配置されている。３は探傷水で恒温水槽８より探傷水循
環ポンプ９により装置内を循環する。４は固定部、５は
回転カップリング部、６は回転部でここに取付けられた
超音波探触子群を回転する。７は水シール、10は上記超
音波探触子群の反射波を受信して探傷する超音波探傷
機、11は受信処理部、12はパソコン、13は回転部駆動、
恒温水槽の制御装置である。In FIG. 2, 1 is a lead sheath pipe, 2 is an ultrasonic probe 2A for oblique angle flaw detection, an ultrasonic probe 2B for vertical flaw detection, and an ultrasonic probe 2C for surface layer oblique angle flaw detection. In the ultrasonic probe group, the oblique angle ultrasonic probe 2A is approximately 30 ° to the left and right with respect to the center line of the lead sheath pipe 1, and the vertical ultrasonic probe 2B is on the vertical line. The ultrasonic probe 2C for superficial oblique angle flaw detection is arranged at about 40 ° to the left and right with respect to the direction perpendicular to the center line. Numeral 3 is flaw detection water, which is circulated in the apparatus from a constant temperature water tank 8 by a flaw detection water circulation pump 9. Reference numeral 4 is a fixed portion, 5 is a rotary coupling portion, and 6 is a rotating portion for rotating the ultrasonic probe group attached thereto. 7 is a water seal, 10 is an ultrasonic flaw detector that receives and reflects the reflected waves of the ultrasonic probe group, 11 is a reception processing unit, 12 is a personal computer, 13 is a rotating unit drive,
It is a controller for a constant temperature water tank.
【０００８】前述のように、鉛シースパイプ１を斜角探
傷した場合、高周波の減衰が大きく、特に図４（ロ）の
ようなラミネート状欠陥においては、超音波の探触子方
向へ返る反射が少なく欠陥検出が困難である。しかし、
垂直探傷用超音波探触子２Ｂを配置することにより、図
６のようにラミネート状欠陥Ａからの反射の大部分は該
探触子２Ｂの方向に返るので、たとえ鉛シースパイプ１
の裏面近くの欠陥であっても感度よく検出することが可
能となる。又、鉛シースパイプ１裏面からのエコーレベ
ルを常時監視し、エコーレベルの急激な変化より表面近
傍を含めた鉛シースパイプ１の厚み方向の全領域の探傷
が可能となる。As described above, when the lead sheath pipe 1 is obliquely flaw-detected, high-frequency attenuation is large, and particularly in the laminated defect as shown in FIG. 4B, the reflection of ultrasonic waves returning toward the probe. It is difficult to detect defects. But,
By arranging the ultrasonic probe 2B for vertical flaw detection, most of the reflection from the laminated defect A is returned in the direction of the probe 2B as shown in FIG.
It is possible to detect with high sensitivity even a defect near the back surface of the. Further, the echo level from the back surface of the lead sheath pipe 1 is constantly monitored, and it is possible to detect flaws in the entire area in the thickness direction of the lead sheath pipe 1 including the vicinity of the surface due to the abrupt change of the echo level.
【０００９】又斜角探傷での受信波は、前述した通り、
図５に示すように表面エコーＳにより表面近傍（約１ｍ
ｍ）は検出不可部分となるが、この表面近傍の欠陥を検
出するために表層斜角探傷を併用する。即ち図７に示す
ように超音波の屈折が臨界付近になるように表層斜角探
傷用超音波探触子２Ｃを傾けて（約40°）配置し、表面
層を超音波を伝播させることにより表面近傍の欠陥の検
出が可能となる。The received wave in the oblique flaw detection is as described above.
As shown in FIG. 5, the vicinity of the surface (about 1 m
Although m) is an undetectable portion, surface layer oblique flaw detection is also used in order to detect a defect near the surface. That is, as shown in FIG. 7, by arranging the ultrasonic probe 2C for superficial angle oblique flaw detection so that the refraction of the ultrasonic wave is near the critical position (about 40 °), the ultrasonic wave is propagated through the surface layer. It is possible to detect defects near the surface.
【００１０】水中における微小ボイドや異物等による誤
検出を防止するためには、超音波が水中を伝播している
時間帯を探傷不要部分とすることにより実現できる。一
般には表面エコーをトリガーに探傷領域を設定するが、
斜角探傷や表層斜角探傷の場合、表面エコーのレベルは
鉛シースパイプの振動や押出し状態により変化が著し
い。そこで本発明では、表面エコーのトリガーに代え
て、図８に示すように超音波探触子２Ａ（又は２Ｃ）か
ら発射される超音波が鉛シースパイプ１で正反射する経
路に音響的ミラー14を設置し、ｔMを計測することによ
り鉛シースパイプ１までの距離を計測することができ
る。In order to prevent erroneous detection due to minute voids or foreign matter in water, it can be realized by making the time zone during which ultrasonic waves propagate in water unnecessary for flaw detection. Generally, the surface echo is used as a trigger to set the flaw detection area,
In the case of the bevel flaw detection and the surface bevel flaw detection, the level of the surface echo changes significantly depending on the vibration of the lead sheath pipe and the extrusion state. Therefore, in the present invention, instead of the trigger of the surface echo, as shown in FIG. 8, the acoustic mirror 14 is provided in the path where the ultrasonic waves emitted from the ultrasonic probe 2A (or 2C) are regularly reflected by the lead sheath pipe 1. Is installed, and the distance to the lead sheath pipe 1 can be measured by measuring tM.
【００１１】図８は超音波探触子２Ａ（又は２Ｃ）と鉛
シースパイプ１の表面、音響的ミラー14と鉛シースパイ
プ１の表面までの距離を等しく配置した例で、ｔMを計
測することにより、超音波探触子２Ａ（２Ｂ）から出た
超音波が鉛シースパイプ１の表面で反射して超音波探触
子２Ａ（２Ｂ）で再び受信するまでの時間ｔｓ＝ｔM／
２が判る。このｔｓに表面エコーＳで探傷不能となる時
間ｔｗ後より探傷検査範囲を設定することにより、水中
でのボイドや異物等による誤動作を防止して検出するこ
とができる。FIG. 8 shows an example in which the ultrasonic probe 2A (or 2C) and the surface of the lead sheath pipe 1 and the acoustic mirror 14 and the surface of the lead sheath pipe 1 are arranged at the same distance, and tM is measured. Thus, the time ts = tM / until the ultrasonic wave emitted from the ultrasonic probe 2A (2B) is reflected on the surface of the lead sheath pipe 1 and is received again by the ultrasonic probe 2A (2B).
I understand 2. By setting the flaw detection inspection range to the time ts after the time tw when the surface echo S does not allow flaw detection, it is possible to prevent and detect malfunctions due to voids or foreign matter in the water.
【００１２】又垂直探傷用超音波探触子を用いた垂直探
傷では、表面エコーをトリガーとして表面エコー部を除
く裏面エコーまでの間を探傷範囲とするが、裏面エコー
のレベルをトレンド的に監視することにより、表面直下
すなわち表面エコーでかくれる部分も探傷可能となる。
即ち、図９（イ）に示すように、垂直探傷用超音波探触
子２Ｂにより垂直探傷を行う場合、鉛シースパイプ１内
に欠陥がなければ裏面エコーレベル図９（ロ）のＥBの
レベルになるが、内部欠陥があると、たえそれが表面エ
コーＳにかくれる部分であっても、欠陥部で超音波が反
射拡散する分だけ減少し、裏面エコーレベルが△ＥB分
低下することになる。もちろん鉛シースパイプの厚み変
動があればＥBは変化するが、厚み変動は急激に変化す
るものではないので、ＥBの絶対値を監視するのではな
く、時間に対する変化量を監視することにより、欠陥の
有無を見つけることができる。Further, in the vertical flaw detection using an ultrasonic probe for vertical flaw detection, the surface echo is used as a trigger and the flaw detection area extends to the back surface echo excluding the surface echo portion, but the back surface echo level is monitored in a trend manner. By doing so, it is possible to detect flaws just under the surface, that is, a portion which is covered by the surface echo.
That is, as shown in FIG. 9 (b), the vertical flaw ultrasonic probe 2B when performing vertical flaw detection, if there is a defect in the lead sheath pipe 1 back surface echo level Figure 9 E B of (b) However, if there is an internal defect, even if it is a part that can obscure the surface echo S, it will decrease by the amount of ultrasonic waves reflected and diffused at the defect, and the back surface echo level will decrease by ΔE B. Will be done. Of course, if there is a change in the thickness of the lead sheath pipe, E B changes, but since the thickness change does not change abruptly, by monitoring the amount of change over time, not by monitoring the absolute value of E B. , Can be found with or without defects.
【００１３】[0013]
【実施例】外径70〜 150ｍｍφ、肉厚 3.0〜 6.0ｍｍの
鉛シースパイプに含まれている 1.0ｍｍφ以上の異物、
ボイド及び 0.5ｍｍ以上の表面又は内部亀裂等を、図２
に示す装置を用いて検出する場合の各シースパイプ径の
検査密度、検査ラップ量、検査ピッチ等を表１に示す。
なお、検査ラップ量、検査ピッチは図10に示すものをい
う。[Example] A foreign substance of 1.0 mmφ or more contained in a lead sheath pipe having an outer diameter of 70 to 150 mmφ and a wall thickness of 3.0 to 6.0 mm,
Figure 2 shows voids and surface or internal cracks of 0.5 mm or more.
Table 1 shows the inspection density of each sheath pipe diameter, the inspection lap amount, the inspection pitch, etc. when the detection is performed using the device shown in FIG.
The inspection lap amount and the inspection pitch are as shown in FIG.
【００１４】[0014]
【表１】 [Table 1]
【００１５】又上記鉛シースパイプ内に、テスト的に異
物を混入させた検出結果を表２に示す。Table 2 shows the detection results obtained by mixing foreign substances into the lead sheath pipe as a test.
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【発明の効果】以上説明したように、本発明の鉛シース
パイプの欠陥検出方法によれば、鉛シースパイプ厚み方
法の全領域及び全長にわたって欠陥の検出が可能とな
り、製品の品質、信頼性の向上に著しく貢献する。As described above, according to the defect detecting method of the lead sheath pipe of the present invention, it is possible to detect the defect over the entire area and the entire length of the lead sheath pipe thickness method, and the quality and reliability of the product can be improved. Significantly contribute to improvement.
【図１】本発明の電線用鉛シースパイプの欠陥検出方法
の具体例の説明図である。FIG. 1 is an explanatory diagram of a specific example of a defect detection method for a lead sheath pipe for electric wires according to the present invention.
【図２】図１の欠陥検出方法を実現する装置の構成図で
ある。FIG. 2 is a configuration diagram of an apparatus that implements the defect detection method of FIG.
【図３】斜角探傷用超音波探触子による斜角探傷の説明
図である。FIG. 3 is an explanatory diagram of bevel flaw detection using a bevel flaw detection ultrasonic probe.
【図４】（イ）及び（ロ）はいずれも斜角探傷の問題点
の説明図である。FIG. 4A and FIG. 4B are explanatory views of problems of oblique flaw detection.
【図５】斜角損傷のさらに他の問題点の説明図である。FIG. 5 is an explanatory diagram of still another problem of bevel damage.
【図６】垂直探傷用超音波探触子による垂直探傷の説明
図である。FIG. 6 is an explanatory diagram of vertical flaw detection by an ultrasonic probe for vertical flaw detection.
【図７】表層斜角損傷用超音波探触子による表層斜角探
傷の説明図である。FIG. 7 is an explanatory diagram of superficial bevel flaw detection by a superficial bevel damage ultrasonic probe.
【図８】図８（イ）は音響ミラーを用いた斜角又は表層
斜角探傷の説明図、図８（ロ）は欠陥検出の説明図であ
る。FIG. 8A is an explanatory view of oblique or surface oblique inspection using an acoustic mirror, and FIG. 8B is an explanatory view of defect detection.
【図９】図９（イ）は垂直探傷の説明図、図９（ロ）は
欠陥検出の説明図である。9A is an explanatory diagram of vertical flaw detection, and FIG. 9B is an explanatory diagram of defect detection.
【図１０】実施例の表１における検査ラップ量及び検査
ピッチの説明図である。FIG. 10 is an explanatory diagram of an inspection lap amount and an inspection pitch in Table 1 of the example.
１ 鉛シースパイプ ２ 探傷用超音波探触子群 ２Ａ 斜角損傷用超音波探触子 ２Ｂ 垂直探傷用超音波探触子 ２Ｃ 表層斜角探傷用超音波探触子 ３ 探傷水 ４ 固定部 ５ 回転カップリング部 ６ 回転部 ７ 水シール ８ 恒温水槽 ９ 探傷子循環ポンプ 10 超音波探傷機 11 受信処理部 12 パソコン 13 回転部駆動、恒温水槽制御装置 1 Lead sheath pipe 2 Ultrasonic probe group for flaw detection 2A Ultrasonic probe for oblique flaw 2B Ultrasonic probe for vertical flaw 2C Ultrasonic probe for oblique flaw 3 Surface water 4 Fixing part 5 Rotating coupling part 6 Rotating part 7 Water seal 8 Constant temperature water tank 9 Flaw detector circulating pump 10 Ultrasonic flaw detector 11 Reception processing part 12 PC 13 Rotating part drive, constant temperature water tank control device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 原 博 兵庫県伊丹市昆陽北一丁目１番１号 住友 電気工業株式会社伊丹製作所内 (72)発明者 樫内 良信 兵庫県伊丹市昆陽北一丁目１番１号 住友 電気工業株式会社伊丹製作所内 (72)発明者 森 俊造 大阪市此花区島屋一丁目１番３号 住友電 気工業株式会社大阪製作所内 (72)発明者 辻田 繁和 大阪市淀川区西中島５丁目９番２号 ダイ ヤ電子応用株式会社内 (72)発明者 清田 文範 福岡県北九州市小倉北区井堀４丁目10番13 号 新日本非破壊検査株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hara 1-1-1 Kunyo Kita, Itami City, Hyogo Prefecture Sumitomo Electric Industries, Ltd. Itami Works (72) Inventor Yoshinobu Kashiuchi 1-chome, Koyo Kita, Itami City, Hyogo Prefecture 1-1 Sumitomo Electric Industries, Ltd. Itami Works (72) Inventor Shunzo Mori 1-3-3 Shimaya, Konohana-ku, Osaka City Sumitomo Electric Industries Ltd. Osaka Works (72) Inventor Shigekazu Tsujita Yodogawa, Osaka City Nishinakajima 5-9-2 Daiya Electronics Application Co., Ltd. (72) Inventor Fuminori Kiyota 4-10-13 Ibori Ibori, Kokurakita-ku, Kitakyushu, Fukuoka
Claims (4)
超音波探触子及び垂直探傷用超音波探触子を配置し、こ
れら超音波探触子を回転させ発射される超音波により、
回転水流中で鉛シースパイプの欠陥を検出することを特
徴とする電線用鉛シースパイプの欠陥検出方法。1. An ultrasonic probe for oblique-angle flaw detection and an ultrasonic probe for vertical flaw detection are arranged on the outer circumference of a lead sheath pipe, and ultrasonic waves emitted by rotating these ultrasonic probes. Due to
A method for detecting a defect in a lead sheath pipe for an electric wire, which comprises detecting a defect in the lead sheath pipe in a rotating water flow.
探触子を付加したことを特徴とする請求項１記載の電線
用鉛シースパイプの欠陥検出方法。2. The method for detecting a defect in a lead sheath pipe for electric wire according to claim 1, wherein an ultrasonic probe for oblique-angle surface layer flaw detection is added as the ultrasonic probe.
波探触子又は表層斜角探傷用超音波探触子より発射され
る超音波が鉛シースパイプで正反射する経路に音響的ミ
ラーを設置し、送信波発射から該音響的ミラーからのエ
コー受信までの時間により鉛シースパイプまでの距離を
計測し、鉛シースパイプまでの距離区間と鉛シースパイ
プからの表面エコー部までを除く探傷ゲートを自動設定
することを特徴とする電線用鉛シースパイプの欠陥検出
方法。3. The acoustic wave according to claim 1, wherein ultrasonic waves emitted from the ultrasonic probe for bevel flaw detection or the ultrasonic probe for surface bevel flaw detection are specularly reflected by the lead sheath pipe. A mirror is installed, the distance to the lead sheath pipe is measured by the time from the transmission wave emission to the echo reception from the acoustic mirror, and the distance section to the lead sheath pipe and the surface echo part from the lead sheath pipe are excluded. A method for detecting a defect in a lead sheath pipe for electric wires, which is characterized by automatically setting a flaw detection gate.
波探触子より発射される超音波の鉛シースパイプ表面エ
コー後から裏面エコーまでを探傷範囲として自動的にゲ
ートをかけ、かつ裏面エコーレベルのトレンド監視によ
り急激な変化点を欠陥として検出することを特徴とする
電線用鉛シースパイプの欠陥検出方法。4. The gate according to claim 1 or 2, wherein the ultrasonic wave emitted from the ultrasonic probe for vertical flaw detection is automatically gated with the flaw detection range from after the lead sheath pipe surface echo to the back echo. A method for detecting a defect in a lead sheath pipe for electric wire, which is characterized by detecting a sudden change point as a defect by monitoring a trend of an echo level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14067696A JP3264828B2 (en) | 1996-05-10 | 1996-05-10 | Defect detection method of lead sheath pipe for electric wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14067696A JP3264828B2 (en) | 1996-05-10 | 1996-05-10 | Defect detection method of lead sheath pipe for electric wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09304358A true JPH09304358A (en) | 1997-11-28 |
| JP3264828B2 JP3264828B2 (en) | 2002-03-11 |
Family
ID=15274171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14067696A Expired - Fee Related JP3264828B2 (en) | 1996-05-10 | 1996-05-10 | Defect detection method of lead sheath pipe for electric wire |
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|---|---|
| JP (1) | JP3264828B2 (en) |
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