JPH08248012A - Ultrasonic flaw detector for lead sheath tube - Google Patents
Ultrasonic flaw detector for lead sheath tubeInfo
- Publication number
- JPH08248012A JPH08248012A JP7047425A JP4742595A JPH08248012A JP H08248012 A JPH08248012 A JP H08248012A JP 7047425 A JP7047425 A JP 7047425A JP 4742595 A JP4742595 A JP 4742595A JP H08248012 A JPH08248012 A JP H08248012A
- Authority
- JP
- Japan
- Prior art keywords
- sheath tube
- ultrasonic
- lead sheath
- probe
- flaw detector
- 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
- 239000000523 sample Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 10
- 230000007547 defect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 19
- 238000007689 inspection Methods 0.000 description 10
- 230000002950 deficient Effects 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 oxides Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
-
- 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
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
(57)【要約】
【目的】 超音波探触子の全面に亘ってビーム路程差の
ない鉛シース管用超音波探傷装置を提供する。
【構成】 鉛シース管１０の外方に配した超音波探触子
１の超音波放射面２０より超音波を発生させ、この鉛シ
ース管１０からの反射波を検出する鉛シース管用超音波
探傷装置において、上記超音波探触子１の超音波放射面
２０が鉛シース管１０の径方向内方に向けられ、かつ鉛
シース管１０の軸方向に傾けられていると共に、この超
音波放射面２０が鉛シース管１０の外周円２３からの距
離を一定とする曲面を形成している。
(57) [Abstract] [Purpose] To provide an ultrasonic flaw detector for a lead sheath tube having no beam path difference over the entire surface of the ultrasonic probe. [Structure] Ultrasonic flaw detection for a lead sheath tube for generating ultrasonic waves from an ultrasonic wave emitting surface 20 of an ultrasonic probe 1 arranged outside the lead sheath tube 10 and detecting a reflected wave from the lead sheath tube 10. In the apparatus, the ultrasonic wave emitting surface 20 of the ultrasonic probe 1 is directed inward in the radial direction of the lead sheath tube 10 and is inclined in the axial direction of the lead sheath tube 10, and the ultrasonic wave emitting surface is also formed. A curved surface 20 forms a constant distance from the outer circumference circle 23 of the lead sheath tube 10.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超音波の反射波を利用
して欠陥を検査する鉛シース管用超音波探傷装置に係
り、特に、超音波探触子の全面に亘ってビーム路程差の
ない鉛シース管用超音波探傷装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead sheath tube ultrasonic flaw detector for inspecting defects by utilizing reflected waves of ultrasonic waves, and more particularly, to a beam path difference over the entire surface of the ultrasonic probe. The present invention relates to an ultrasonic flaw detector for a lead sheath tube.
【０００２】[0002]
【従来の技術】生産ラインにおける金属パイプの超音波
探傷の手法としては、一方向に曲率を持ったポリマー探
触子を円周上に複数個配置し、パイプ材料内部の欠陥を
検出するパイプ全面探傷システムがある（社団法人 日
本非破壊検査協会 第２分科会資料「無回転式パイプ全
面探傷用探触子ＨＲＰ」１９９４年８月）。このシステ
ムに用いられる探触子はポリマー製の振動子を長手方向
にＲ２０〜Ｒ１１０の曲率をもって一方向に曲げたもの
である。2. Description of the Related Art Ultrasonic flaw detection for metal pipes on a production line is performed by arranging a plurality of polymer probes having a curvature in one direction on the circumference to detect defects inside the pipe material. There is a flaw detection system (Japan Non-Destructive Inspection Association 2nd Subcommittee Material "Non-rotating Pipe Probe HRP for Full-face Flaw Inspection" August 1994). The probe used in this system is a polymer vibrator bent in one direction with a curvature of R20 to R110 in the longitudinal direction.
【０００３】図６に示されるように、このシステムで
は、金属パイプ２ａの円周方向に曲率を持つ探触子１ａ
を金属パイプ２ａの周囲に金属パイプ２ａの軸方向に対
して直角に複数個配置し、その中で金属パイプ２ａを軸
方向に移動させて探傷検査を行うものである。このシス
テムによる装置は、図７に示されるように、水を満たし
た水槽３の入口及び出口に封水のためのシャッタ機構
（封水シャッタ）６を配置し、図６の探触子配置を持つ
探触子ユニット５を位置調整機構４に取り付けたものを
水中に配し、これら探触子ユニット５の中心に金属パイ
プ２ａを通過させる。相互に円周方向位置の異なる探触
子ユニット５を複数配置することにより、金属パイプ２
ａの全周面に亘る検査を可能としている。As shown in FIG. 6, in this system, the probe 1a having a curvature in the circumferential direction of the metal pipe 2a.
Are arranged around the metal pipe 2a at right angles to the axial direction of the metal pipe 2a, and the metal pipe 2a is moved in the axial direction to perform a flaw inspection. As shown in FIG. 7, the device according to this system has a shutter mechanism (sealing shutter) 6 for sealing water at the inlet and the outlet of a water tank 3 filled with water, and the probe arrangement shown in FIG. The probe unit 5 which it has is attached to the position adjusting mechanism 4 is placed in water, and the metal pipe 2a is passed through the center of these probe units 5. By disposing a plurality of probe units 5 having different circumferential positions from each other, the metal pipe 2
It is possible to inspect the entire surface of a.
【０００４】[0004]
【発明が解決しようとする課題】前述の探触子を応用し
て鉛シース管の超音波探傷を行おうとすると、以下の問
題点が生じる。When the above probe is applied for ultrasonic flaw detection of a lead sheath tube, the following problems occur.
【０００５】１）鉛シース管の材料厚さは、一般的に５
ｍｍ程度と薄いために、その材料中の欠陥を検出するこ
とが難しくなる。図８に示されるように、超音波探触子
１ａから発振した超音波ビーム７（矢印で進行方向を示
す）は鉛シース管１０の内部に伝達されて、欠陥が存在
する場合、その欠陥部分から反射する。その反射波を捕
えて探傷を行う。ところが、超音波ビームは材料の表面
や裏面からも反射する。従って、検出される反射波は、
材料表面からの反射波８や材料裏面からの反射波９を含
んでいる。得られる波形には、図９に示されるように、
材料表面からの反射波による波形８ａや材料裏面からの
反射波による波形９ａが大きく現れている。このため材
料の肉厚に相当する検査範囲１１の中に存在する欠陥部
分からの反射波による波形１２ａが埋もれてしまい、検
出ができなくなる。1) The material thickness of the lead sheath tube is generally 5
Since it is as thin as mm, it becomes difficult to detect defects in the material. As shown in FIG. 8, the ultrasonic beam 7 oscillated from the ultrasonic probe 1a (the traveling direction is indicated by an arrow) is transmitted to the inside of the lead sheath tube 10, and if there is a defect, the defective portion is present. Reflected from. The reflected wave is captured and flaw detection is performed. However, the ultrasonic beam is also reflected from the front and back surfaces of the material. Therefore, the reflected wave detected is
It includes a reflected wave 8 from the material front surface and a reflected wave 9 from the material back surface. The waveform obtained is, as shown in FIG.
The waveform 8a due to the reflected wave from the material front surface and the waveform 9a due to the reflected wave from the material back surface are largely shown. Therefore, the waveform 12a due to the reflected wave from the defective portion existing in the inspection range 11 corresponding to the thickness of the material is buried and cannot be detected.
【０００６】２）上記の材料表面・裏面からの反射波を
小さくするために、探触子を鉛シース管の軸方向に傾
け、超音波ビームを斜めに入射させる方法がある。図１
０に示されるように、超音波ビーム７が鉛シース管１０
に入射すると、その入射方向が傾いていることにより、
材料表面からの反射波８と材料裏面からの反射波９と
は、各々探触子１ａの方向とは異なる方向に反射するの
で、前述の波形８ａや波形９ａが検出波形には現れず、
欠陥部分からの反射波による波形１２ａのみ検出可能と
なる。ところが、探触子を傾けることによって、図１１
に示す別の問題が発生する。即ち、超音波探触子１ａが
鉛シース管１０の円周方向に曲率と長さ１５とを持って
いるが故に、鉛シース管１０の軸方向に傾きを持って入
射する超音波ビームの中央部でのビーム路程１３と両端
部でのビーム路程１４との間に差が生じる。その結果、
波形に現れる反射波から欠陥部分の位置が特定できなく
なる。つまり、欠陥部分からの反射波が検出されても、
その反射波を探触子１ａの中央部で捕えたか、端部で捕
えたかによって波形に反射波の現れる位置が異なり、材
料の肉厚に相当する検査範囲での検査ができなくなる。2) In order to reduce the reflected waves from the front and back surfaces of the material, there is a method in which the probe is tilted in the axial direction of the lead sheath tube and the ultrasonic beam is obliquely incident. FIG.
As shown in FIG.
When incident on, due to the inclination of the incident direction,
The reflected wave 8 from the front surface of the material and the reflected wave 9 from the back surface of the material are reflected in directions different from the direction of the probe 1a respectively, so that the above-mentioned waveforms 8a and 9a do not appear in the detected waveform
Only the waveform 12a due to the reflected wave from the defective portion can be detected. However, by tilting the probe,
Another problem occurs as shown in. That is, since the ultrasonic probe 1a has a curvature and a length 15 in the circumferential direction of the lead sheath tube 10, the center of the ultrasonic beam incident with an inclination in the axial direction of the lead sheath tube 10. There is a difference between the beam path 13 at one end and the beam path 14 at both ends. as a result,
The position of the defect cannot be specified from the reflected wave appearing in the waveform. In other words, even if the reflected wave from the defective part is detected,
The position at which the reflected wave appears in the waveform differs depending on whether the reflected wave is caught at the central portion or the end portion of the probe 1a, and it becomes impossible to perform an inspection in the inspection range corresponding to the thickness of the material.
【０００７】３）また、鉛シース管の場合、その材料の
比重が大きいための特性として超音波減衰が非常に大き
い。このためより大きな振動エネルギが必要であり、大
きな面積を持つ探触子を使用する必要が生じるが、その
ために図１１の超音波探触子１ａの幅１６を大きくする
と、前記のビーム路程の差がより増大することになり、
検査はいっそう難しいものになる。3) Further, in the case of the lead sheath tube, ultrasonic attenuation is very large as a characteristic because the material has a large specific gravity. For this reason, a larger vibration energy is required, and it is necessary to use a probe having a large area. Therefore, if the width 16 of the ultrasonic probe 1a in FIG. Will increase,
The inspection becomes more difficult.
【０００８】そこで、本発明の目的は、上記課題を解決
し、超音波探触子の全面に亘ってビーム路程差のない鉛
シース管用超音波探傷装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an ultrasonic flaw detector for a lead sheath tube which has no beam path difference over the entire surface of the ultrasonic probe.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に本発明は、鉛シース管の外方に配した超音波探触子の
超音波放射面より超音波を発生させ、この鉛シース管か
らの反射波を検出する鉛シース管用超音波探傷装置にお
いて、上記超音波探触子の超音波放射面が鉛シース管の
径方向内方に向けられ、かつ鉛シース管の軸方向に傾け
られていると共に、この超音波放射面が鉛シース管の外
周円からの距離を一定とする曲面を形成しているもので
ある。In order to achieve the above object, the present invention is to generate an ultrasonic wave from an ultrasonic wave emitting surface of an ultrasonic probe arranged outside a lead sheath tube, and to generate the ultrasonic wave. In a lead sheath tube ultrasonic flaw detector for detecting reflected waves from, the ultrasonic radiation surface of the ultrasonic probe is directed radially inward of the lead sheath tube and tilted in the axial direction of the lead sheath tube. In addition, the ultrasonic wave emitting surface forms a curved surface that keeps a constant distance from the outer circumference circle of the lead sheath tube.
【００１０】上記超音波探触子の超音波放射面が鉛シー
ス管を囲繞する三次曲面の一部であってもよい。The ultrasonic wave emitting surface of the ultrasonic probe may be a part of a cubic curved surface surrounding the lead sheath tube.
【００１１】また、水中に通され軸方向に移動する鉛シ
ース管の周囲に、この鉛シース管の外周円からの距離が
一定となる三次曲面の超音波放射面を有する超音波探触
子を鉛シース管の軸方向に傾けて鉛シース管の周方向に
複数配置し、これら超音波探触子を鉛シース管から一定
距離に保つ倣いローラを設け、鉛シース管の肉厚内の欠
陥部分からの反射波に基づき欠陥を検査する超音波探傷
機を設けたものである。Further, there is provided an ultrasonic probe having a cubic curved ultrasonic wave emitting surface around the lead sheath tube which is passed through the water and moves in the axial direction, at a constant distance from the outer circumference circle of the lead sheath tube. A plurality of ultrasonic rollers are arranged in the circumferential direction of the lead sheath tube by inclining in the axial direction of the lead sheath tube, and a copying roller is provided to keep these ultrasonic probes at a constant distance from the lead sheath tube. An ultrasonic flaw detector that inspects for defects based on the reflected wave from is provided.
【００１２】[0012]
【作用】上記構成により、超音波探触子は、その超音波
放射面が鉛シース管の径方向内方に向いているだけでな
く、鉛シース管の軸方向に傾けられているので、材料表
面・裏面からの反射波には影響されない。加えて、この
超音波放射面が鉛シース管の外周円からの距離を一定と
する曲面を形成しているので、鉛シース管までのビーム
路程は超音波放射面の場所によらず一定である。即ち、
中央部と両端部とでビーム路程差がない。反射波の波形
から欠陥部分の位置が特定できることになる。With the above-described structure, the ultrasonic probe has not only its ultrasonic radiation surface directed inward in the radial direction of the lead sheath tube but also tilted in the axial direction of the lead sheath tube. It is not affected by the reflected waves from the front and back surfaces. In addition, since this ultrasonic radiation surface forms a curved surface that keeps the distance from the outer circumference of the lead sheath tube constant, the beam path to the lead sheath tube is constant regardless of the location of the ultrasonic radiation surface. . That is,
There is no beam path difference between the central part and both ends. The position of the defective portion can be specified from the waveform of the reflected wave.
【００１３】また、ビーム路程が超音波放射面の場所に
よらず一定であることは、鉛シース管の外周円上に焦点
が分布していることになり、超音波エネルギが最大に集
約され、検査に有利である。Further, the fact that the beam path is constant regardless of the position of the ultrasonic radiation surface means that the focal points are distributed on the outer circumference circle of the lead sheath tube, and the ultrasonic energy is concentrated to the maximum. It is advantageous for inspection.
【００１４】また、大きな超音波エネルギを得るために
超音波放射面の面積を大きくする場合、超音波探触子を
鉛シース管の軸に沿った方向に大きくしても、鉛シース
管の周方向に大きくしてもビーム路程に差が現れないの
で、検査に障害を与えずに大きな超音波エネルギを得る
ことができる。Further, when the area of the ultrasonic radiation surface is increased in order to obtain large ultrasonic energy, even if the ultrasonic probe is increased in the direction along the axis of the lead sheath tube, the circumference of the lead sheath tube is increased. Even if it is increased in the direction, the difference in the beam path does not appear, so that a large ultrasonic energy can be obtained without impeding the inspection.
【００１５】さらに、鉛シース管の全周に亘って検査を
行うために複数個の超音波探触子を鉛シース管の周囲に
配置する場合、超音波探触子を鉛シース管の周方向に大
きくすることにより、超音波探触子のチャンネル数を減
じることができ、構成の簡素化と共に信頼性を向上させ
ることができる。Further, when a plurality of ultrasonic probes are arranged around the lead sheath tube in order to inspect the entire circumference of the lead sheath tube, the ultrasonic probes are arranged in the circumferential direction of the lead sheath tube. By increasing the number of channels, it is possible to reduce the number of channels of the ultrasonic probe, simplify the configuration, and improve reliability.
【００１６】移動する鉛シース管に対し超音波探触子を
倣いローラによって倣い追従させて一定距離に保ち、か
つ超音波の伝達に必要な水を水槽に確保しつつ、連続的
に超音波探傷することができる。An ultrasonic probe is made to follow a moving lead sheath tube by a copying roller so as to follow the moving lead sheath tube to keep a constant distance, and while water necessary for transmitting ultrasonic waves is secured in a water tank, ultrasonic flaw detection is continuously performed. can do.
【００１７】[0017]
【実施例】以下本発明の一実施例を添付図面に基づいて
詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
【００１８】図１に示されるように、鉛シース管１０の
外方に配した本発明の超音波探触子１は、その超音波放
射面２０が鉛シース管１０の径方向内方に向けられ、か
つ鉛シース管１０の軸方向に傾けられている。その傾き
は、鉛シース管１０の軸線２１に直交する面に対する超
音波探触子１の幅広面の角度θで表される。超音波放射
面２０の全方向に対する中心の点から角度θに従い超音
波ビームが出射されるものとし、これより鉛シース管１
０の軸線２１までの直線距離はｒとなる。この超音波探
触子１は、鉛シース管１０の表面に超音波エネルギを収
束させるための、フォーカス曲率半径Ｒを有している。
即ち、超音波放射面２０が鉛シース管１０の外周円２３
からの距離Ｒを一定とする曲面を形成している。この曲
面は、鉛シース管１０を取り巻くドーナツ状の仮想の空
間２２の表面に沿っており、超音波探触子１はこのドー
ナツ状の空間２２の表面の一部を超音波放射面２０とし
たものである。鉛シース管１０の円周方向における超音
波探触子１の幅はＷ、鉛シース管１０の軸方向における
超音波探触子１の長さはＡである。As shown in FIG. 1, in the ultrasonic probe 1 of the present invention arranged outside the lead sheath tube 10, its ultrasonic wave emitting surface 20 is directed inward in the radial direction of the lead sheath tube 10. And is tilted in the axial direction of the lead sheath tube 10. The inclination is represented by an angle θ of the wide surface of the ultrasonic probe 1 with respect to a surface of the lead sheath tube 10 orthogonal to the axis 21. It is assumed that an ultrasonic beam is emitted from the center point of the ultrasonic wave emitting surface 20 with respect to all directions at an angle θ.
The straight line distance to the axis 21 of 0 is r. This ultrasonic probe 1 has a focus curvature radius R for focusing ultrasonic energy on the surface of the lead sheath tube 10.
That is, the ultrasonic wave emitting surface 20 is the outer circumference circle 23 of the lead sheath tube 10.
A curved surface is formed so that the distance R from is constant. This curved surface is along the surface of a virtual donut-shaped space 22 surrounding the lead sheath tube 10, and the ultrasonic probe 1 uses a part of the surface of this donut-shaped space 22 as the ultrasonic wave emitting surface 20. It is a thing. The width of the ultrasonic probe 1 in the circumferential direction of the lead sheath tube 10 is W, and the length of the ultrasonic probe 1 in the axial direction of the lead sheath tube 10 is A.
【００１９】図２（ａ）に示されるように、超音波探触
子１は超音波放射面２０をほぼ正面から見ると、変形し
た扇型を呈している。また、図２（ｂ）に示されるよう
に、ほぼ側面から見ると、フォーカス曲率半径Ｒに基づ
く曲線が現れている。さらに図２（ｃ）に示されるよう
に、ほぼ平面から見ると、直線距離ｒに基づく曲線が現
れている。このように超音波放射面２０は、３方向に曲
率を持つ複雑な三次曲面である。このために超音波探触
子１は成形加工の容易なポリマ材料で構成されている。As shown in FIG. 2 (a), the ultrasonic probe 1 has a deformed fan shape when the ultrasonic wave emitting surface 20 is viewed substantially from the front. Further, as shown in FIG. 2B, a curve based on the focus curvature radius R appears when viewed from almost the side surface. Further, as shown in FIG. 2C, a curve based on the straight line distance r appears when viewed from almost the plane. As described above, the ultrasonic wave emitting surface 20 is a complicated cubic curved surface having curvatures in three directions. For this reason, the ultrasonic probe 1 is made of a polymer material that can be easily molded.
【００２０】次に実施例の作用を述べる。Next, the operation of the embodiment will be described.
【００２１】図３に示されるように、超音波探触子１よ
り鉛シース管１０に斜めに超音波ビームを入射させる
と、材料中に欠陥部分のない場合、破線で示すように、
材料表面からの反射波８や材料裏面からの反射波９は超
音波探触子１とは別の方向へ反射する。このため検出波
形に影響は表れない。As shown in FIG. 3, when an ultrasonic beam is obliquely incident on the lead sheath tube 10 from the ultrasonic probe 1, when there is no defect in the material, as shown by the broken line,
The reflected wave 8 from the front surface of the material and the reflected wave 9 from the back surface of the material are reflected in a direction different from that of the ultrasonic probe 1. Therefore, the detected waveform is not affected.
【００２２】一方、材料中に欠陥部分１７がある場合、
実線で示すように、欠陥部分１７からの反射波１２は超
音波探触子１に反射する。このため他の反射波に邪魔さ
れることなく欠陥部分１７からの反射波１２のみを捕え
ることができる。また、この図において、超音波放射面
２０上の鉛シース管１０軸に沿った方向で場所によらず
ビーム路程が一定であることがわかる。そして、この図
は鉛シース管１０の周方向のどの位置でも同等に得られ
るから、超音波放射面２０上の鉛シース管１０の周方向
で場所によらずビーム路程が一定であることがわかる。On the other hand, if there is a defective portion 17 in the material,
As indicated by the solid line, the reflected wave 12 from the defective portion 17 is reflected by the ultrasonic probe 1. Therefore, only the reflected wave 12 from the defective portion 17 can be captured without being disturbed by other reflected waves. Further, in this figure, it can be seen that the beam path is constant regardless of location in the direction along the axis of the lead sheath tube 10 on the ultrasonic wave emitting surface 20. Since this figure can be obtained equally at any position in the circumferential direction of the lead sheath tube 10, it can be seen that the beam path is constant regardless of the location in the circumferential direction of the lead sheath tube 10 on the ultrasonic wave emitting surface 20. .
【００２３】超音波探触子１の超音波放射面２０より発
生させた超音波ビームの収束先は、鉛シース管の外周円
２３、即ち、鉛シース管１０の軸に直交する断面に表れ
る外周円２３に一致する。複数の超音波探触子１を同一
円周上に配置することによって、鉛シース管２０の全周
に亘って均一に超音波入射させることが可能である。The focal point of the ultrasonic beam generated from the ultrasonic wave emitting surface 20 of the ultrasonic probe 1 is the outer circumference circle 23 of the lead sheath tube, that is, the outer circumference appearing in the cross section orthogonal to the axis of the lead sheath tube 10. Match the circle 23. By arranging the plurality of ultrasonic probes 1 on the same circumference, it is possible to make the ultrasonic waves uniformly incident on the entire circumference of the lead sheath tube 20.
【００２４】次に本発明の応用例を説明する。Next, an application example of the present invention will be described.
【００２５】鉛シース被覆電力ケーブルの生産ラインに
あっては、押出成形によって製造される鉛シース被覆管
は毎分数メートルの速度で連続的に成形されるが、この
鉛シース管の内部に混在する異物（銅、アルミ、鉄、酸
化物、空洞等）を精度よく検出するために、超音波探傷
を行う。In a production line of a lead sheath-coated power cable, a lead sheath-coated pipe produced by extrusion molding is continuously molded at a speed of several meters per minute, but mixed inside the lead sheath-coated pipe. Ultrasonic flaw detection is performed to accurately detect foreign substances (copper, aluminum, iron, oxides, cavities, etc.).
【００２６】図４に示されるように、鉛シース被覆電力
ケーブルの生産ラインにおける自動超音波探傷装置は、
水を満たした水槽３の両側に封水シャッタ６を持つ入口
及び出口が設けられている。鉛シース管１０は出入口間
を通過できるようになっている。鉛シース管１０に接す
る倣いローラ１８は、この倣いローラ１８に連結された
探触子ユニット５を鉛シース管１０から一定距離に保つ
ためのものである。探触子ユニット５は、図１の超音波
探触子１を同一円周上に複数配置したものであり、探触
子ユニット５で検出された超音波信号が超音波探傷機１
９に送られ、ここで判別された欠陥データはデータ収録
コンピュータ２０に収録・保存されるようになってい
る。また、水槽３に満たされる水は、常時、真空脱気装
置２１によって脱気及び濾過され、気泡や水中浮遊物に
よって発生する誤検査が防止されるようになっている。As shown in FIG. 4, an automatic ultrasonic flaw detector in a lead sheath coated power cable production line is
An inlet and an outlet having water-sealing shutters 6 are provided on both sides of a water tank 3 filled with water. The lead sheath tube 10 can pass between the entrance and the exit. The copying roller 18 in contact with the lead sheath tube 10 is for keeping the probe unit 5 connected to the copying roller 18 at a constant distance from the lead sheath tube 10. The probe unit 5 is formed by arranging a plurality of the ultrasonic probes 1 shown in FIG. 1 on the same circumference, and the ultrasonic signal detected by the probe unit 5 is the ultrasonic flaw detector 1
The defect data sent to the data recording device 9 is discriminated and recorded in the data recording computer 20. Further, the water filled in the water tank 3 is constantly degassed and filtered by the vacuum degassing device 21, so that an erroneous inspection caused by bubbles or suspended matter in water is prevented.
【００２７】この自動超音波探傷装置では、出入口間を
通過する鉛シース管１０が連続的に検査される。水槽３
では、倣いローラ１８が常に鉛シース管１０に接して動
作し、探触子ユニット５を鉛シース管１０表面に追従さ
せて一定距離に保つ。In this automatic ultrasonic flaw detector, the lead sheath tube 10 passing between the entrance and the exit is continuously inspected. Aquarium 3
Then, the copying roller 18 always operates in contact with the lead sheath tube 10 to cause the probe unit 5 to follow the surface of the lead sheath tube 10 and keep it at a constant distance.
【００２８】なお、探触子ユニット５は複数の超音波探
触子１を鉛シース管１０周囲の同一円周上に配置し、さ
らに破線で示されるように、その円周角度位置を変えた
ものを鉛シース管１０の軸方向に複数段重ねて組み合わ
せ、１つのユニットとしたものであり、鉛シース管１０
の全周に亘る検査を可能としている。In the probe unit 5, a plurality of ultrasonic probes 1 are arranged on the same circumference around the lead sheath tube 10, and the angular position of the circumference is changed as indicated by the broken line. The lead sheath tube 10 is formed by stacking a plurality of layers in the axial direction of the lead sheath tube 10 and combining them into one unit.
It is possible to inspect all around.
【００２９】[0029]
【発明の効果】本発明は次の如き優れた効果を発揮す
る。The present invention exhibits the following excellent effects.
【００３０】（１）超音波探触子の全面に亘ってビーム
路程差がないので、反射波の波形が正しく得られ、欠陥
部分の特定が正確にできる。(1) Since there is no beam path difference over the entire surface of the ultrasonic probe, the waveform of the reflected wave can be obtained correctly and the defective portion can be specified accurately.
【００３１】（２）ビーム路程差なく超音波探触子の面
積を大きくできるので、超音波エネルギを大きくするこ
とができる。(2) Since the area of the ultrasonic probe can be increased without the beam path difference, the ultrasonic energy can be increased.
【図１】本発明の一実施例を示す超音波探触子の斜視図
である。FIG. 1 is a perspective view of an ultrasonic probe showing an embodiment of the present invention.
【図２】図１の超音波探触子の正面図、側面図、平面図
である。FIG. 2 is a front view, a side view, and a plan view of the ultrasonic probe of FIG.
【図３】図１の超音波探触子の超音波進行方向を示す鉛
シース管軸に沿った側面図である。FIG. 3 is a side view along the lead sheath tube axis showing an ultrasonic wave traveling direction of the ultrasonic probe of FIG.
【図４】本発明を用いた鉛シース被覆電力ケーブルの生
産ラインにおける自動超音波探傷装置のブロック構成図
である。FIG. 4 is a block configuration diagram of an automatic ultrasonic flaw detector in a lead sheath-coated power cable production line using the present invention.
【図５】図４の自動超音波探傷装置の超音波探触子配置
を示す鉛シース管断面図である。5 is a lead sheath tube sectional view showing an ultrasonic probe arrangement of the automatic ultrasonic flaw detector of FIG. 4. FIG.
【図６】従来の超音波探触子配置を示す鉛シース管断面
図である。FIG. 6 is a cross-sectional view of a lead sheath tube showing a conventional ultrasonic probe arrangement.
【図７】従来の超音波探傷装置の構成図である。FIG. 7 is a configuration diagram of a conventional ultrasonic flaw detector.
【図８】従来の超音波探触子の超音波進行方向を示す鉛
シース管断面図である。FIG. 8 is a sectional view of a lead sheath tube showing an ultrasonic wave traveling direction of a conventional ultrasonic probe.
【図９】従来の超音波探触子による反射波の波形図であ
る。FIG. 9 is a waveform diagram of a reflected wave by a conventional ultrasonic probe.
【図１０】従来の超音波探触子の超音波進行方向を示す
鉛シース管軸に沿った側面図である。FIG. 10 is a side view along a lead sheath tube axis showing an ultrasonic wave traveling direction of a conventional ultrasonic probe.
【図１１】従来の超音波探触子の超音波進行方向を示す
斜視図である。FIG. 11 is a perspective view showing an ultrasonic wave traveling direction of a conventional ultrasonic probe.
１ 超音波探触子 １０ 鉛シース管 ２０ 超音波放射面 1 Ultrasonic probe 10 Lead sheath tube 20 Ultrasonic radiation surface
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木村 忠司 茨城県日立市日高町５丁目１番１号 日立 電線株式会社日高工場内 (72)発明者 筒井 尚 茨城県日立市日高町５丁目１番１号 日立 電線株式会社日高工場内 (72)発明者 野沢 英行 茨城県日立市日高町５丁目１番１号 日立 電線株式会社日高工場内 (72)発明者 武田 晃 東京都江戸川区中葛西５丁目32番８号 株 式会社アスペクト内 (72)発明者 古谷 克彦 東京都江戸川区中葛西５丁目32番８号 株 式会社アスペクト内 (72)発明者 久下 幹雄 東京都江戸川区中葛西５丁目32番８号 株 式会社アスペクト内 (72)発明者 芝 彰男 東京都江戸川区中葛西５丁目32番８号 株 式会社アスペクト内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Kimura 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Takashi Tsutsui 5 Hidakacho, Hitachi City, Ibaraki Prefecture 1-1-1 Hitachi Cable Co., Ltd. Hidaka Plant (72) Inventor Hideyuki Nozawa 5-1-1 Hidakacho, Hitachi City, Ibaraki Hitachi Cable Co. Ltd. Hidaka Plant (72) Inventor Akira Takeda Tokyo Within Aspect Co., Ltd. 5-3-8 Nakakasai, Edogawa-ku (72) Inventor Katsuhiko Furuya Within Aspect 5-53-8 Nakakasai, Edogawa-ku, Tokyo (72) Inventor Mikio Kuge Tokyo Akasha, Ltd. 5-3-8, Nakakasai, Edogawa-ku (72) Inventor Akio Shiba 5-32-8, Nakakasai, Nakagawa, Edogawa-ku, Tokyo
Claims (3)
の超音波放射面より超音波を発生させ、この鉛シース管
からの反射波を検出する鉛シース管用超音波探傷装置に
おいて、上記超音波探触子の超音波放射面が鉛シース管
の径方向内方に向けられ、かつ鉛シース管の軸方向に傾
けられていると共に、この超音波放射面が鉛シース管の
外周円からの距離を一定とする曲面を形成していること
を特徴とする鉛シース管用超音波探傷装置。1. An ultrasonic flaw detector for a lead sheath tube which generates ultrasonic waves from an ultrasonic wave emitting surface of an ultrasonic probe arranged outside the lead sheath tube and detects a reflected wave from the lead sheath tube. The ultrasonic radiation surface of the ultrasonic probe is directed inward in the radial direction of the lead sheath tube and is inclined in the axial direction of the lead sheath tube, and the ultrasonic radiation surface is the outer circumference of the lead sheath tube. An ultrasonic flaw detector for a lead sheath tube, which is characterized by forming a curved surface with a constant distance from a circle.
ース管を囲繞する三次曲面の一部であることを特徴とす
る請求項１記載の鉛シース管用超音波探傷装置。2. The ultrasonic flaw detector for a lead sheath tube according to claim 1, wherein an ultrasonic wave emitting surface of the ultrasonic probe is a part of a cubic curved surface surrounding the lead sheath tube.
管の周囲に、この鉛シース管の外周円からの距離が一定
となる三次曲面の超音波放射面を有する超音波探触子を
鉛シース管の軸方向に傾けて鉛シース管の周方向に複数
配置し、これら超音波探触子を鉛シース管から一定距離
に保つ倣いローラを設け、鉛シース管の肉厚内の欠陥部
分からの反射波に基づき欠陥を検査する超音波探傷機を
設けたことを特徴とする鉛シース管用超音波探傷装置。3. An ultrasonic probe having, around a lead sheath tube which is passed through water and moves in the axial direction, an ultrasonic radiation surface having a cubic curved surface whose distance from the outer circumference circle of the lead sheath tube is constant. A plurality of ultrasonic rollers are arranged in the circumferential direction of the lead sheath tube by inclining in the axial direction of the lead sheath tube, and a copying roller is provided to keep these ultrasonic probes at a constant distance from the lead sheath tube. An ultrasonic flaw detector for a lead sheath tube, which is provided with an ultrasonic flaw detector that inspects for defects based on reflected waves from the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04742595A JP3205678B2 (en) | 1995-03-07 | 1995-03-07 | Ultrasonic flaw detector for lead sheath tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04742595A JP3205678B2 (en) | 1995-03-07 | 1995-03-07 | Ultrasonic flaw detector for lead sheath tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08248012A true JPH08248012A (en) | 1996-09-27 |
| JP3205678B2 JP3205678B2 (en) | 2001-09-04 |
Family
ID=12774810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04742595A Expired - Fee Related JP3205678B2 (en) | 1995-03-07 | 1995-03-07 | Ultrasonic flaw detector for lead sheath tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3205678B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1079369A3 (en) * | 1999-08-20 | 2004-03-17 | General Electric Company | Adjustable acoustic mirror |
| JP2012068071A (en) * | 2010-09-22 | 2012-04-05 | Sumitomo Kinzoku Technol Kk | Ultrasonic wall thickness measuring apparatus and ultrasonic wall thickness measuring method |
| CN116539733A (en) * | 2023-04-06 | 2023-08-04 | 桂林理工大学 | Key-type lead breaking device for acoustic emission detection technology |
-
1995
- 1995-03-07 JP JP04742595A patent/JP3205678B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1079369A3 (en) * | 1999-08-20 | 2004-03-17 | General Electric Company | Adjustable acoustic mirror |
| JP2012068071A (en) * | 2010-09-22 | 2012-04-05 | Sumitomo Kinzoku Technol Kk | Ultrasonic wall thickness measuring apparatus and ultrasonic wall thickness measuring method |
| CN116539733A (en) * | 2023-04-06 | 2023-08-04 | 桂林理工大学 | Key-type lead breaking device for acoustic emission detection technology |
| CN116539733B (en) * | 2023-04-06 | 2025-08-26 | 桂林理工大学 | A push-button lead-breaking device for acoustic emission detection technology |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3205678B2 (en) | 2001-09-04 |
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