JPS61169758A - Continuous non-destructive ultrasonic inspection device for sheet joint - Google Patents

Continuous non-destructive ultrasonic inspection device for sheet joint

Info

Publication number
JPS61169758A
JPS61169758A JP60008423A JP842385A JPS61169758A JP S61169758 A JPS61169758 A JP S61169758A JP 60008423 A JP60008423 A JP 60008423A JP 842385 A JP842385 A JP 842385A JP S61169758 A JPS61169758 A JP S61169758A
Authority
JP
Japan
Prior art keywords
sheet
ultrasonic
joint
signal
probe
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
Application number
JP60008423A
Other languages
Japanese (ja)
Inventor
Setsuo Akiyama
秋山 節夫
Fumitaka Ino
文隆 井野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP60008423A priority Critical patent/JPS61169758A/en
Publication of JPS61169758A publication Critical patent/JPS61169758A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/26Arrangements for orientation or scanning by relative movement of the head and the sensor
    • G01N29/265Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating 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
    • G01N29/36Detecting the response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/38Detecting the response signal, e.g. electronic circuits specially adapted therefor by time filtering, e.g. using time gates
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/023Solids
    • G01N2291/0237Thin materials, e.g. paper, membranes, thin films
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/10Number of transducers
    • G01N2291/102Number of transducers one emitter, one receiver

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  • Physics & Mathematics (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

PURPOSE:To enable continuous high-speed inspection of adhesivity of a joint, by arranging a pair of ultrasonic probes adapted to move in contact with the surface of a sheet at a joint keeping a fixed space, an ultrasonic wave transmitting means, a receiving means and a notifying means. CONSTITUTION:A ultrasonic wave is made incident into a sheet repeatedly at a fixed cycle from a probe 1a. The reflected wave of the incident ultrasonic wave is caught with one probe 1b, the detection signal is outputted into a receiving amplification circuit 11 and further, amplified vertically with a video amplifier 12 to be a vertical way control signal for an oscilloscope 14. A repetition signal is amplified from a transmitting circuit 10 through a time-base amplifier 13 to be outputted as horizontal way control signal for the oscilloscope 14. The received signal amplified from a video amplifier 12 is outputted into a selector circuit 16 via a time gate through a gate circuit 15 and an alarm buzzer 17 is driven by a signal from the selector circuit 16. A continuous rolling inspection is done over surface of a sheet 4 at the joint of rubber or plastic sheets 4 and 5.

Description

【発明の詳細な説明】 劇l!立皿ユニ1 本発明はゴムまたはプラスチックのシートの貼り合わせ
接合部の接着状態を超音波を利用して非破壊的に検査す
る装置に関するものである。
[Detailed Description of the Invention] Drama l! BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for non-destructively inspecting the adhesive state of bonded joints of rubber or plastic sheets using ultrasonic waves.

【夏孜l 土木用(例えば貯水池、産業廃棄物es、ゴルフ場et
c、 )や建築用(例えば、ピル屋上の貯水タンク、屋
上のルーフィング、園芸遊園etc、 )で水漏防止の
ため内面にゴムシートまたはプラスチックシートを全面
に亘って敷きつめることがある。
[Natsuko l For civil engineering (e.g. reservoirs, industrial waste, golf courses, etc.)
In some cases, rubber sheets or plastic sheets are spread over the entire surface of the inner surface to prevent water leakage in buildings (e.g., water storage tanks on rooftops, rooftop roofings, garden parks, etc.).

その際に所定の大きさのシートを貼り合わせる形で敷設
するがその接合部はシート端部を数1重ね合わせて接着
剤または熱融着で接着させるものである。
At this time, sheets of a predetermined size are laid down in a form that is pasted together, and the joint is made by overlapping several sheet ends and bonding them together using an adhesive or heat fusion.

この貼り合わせ接合部の一部でも接着が完全でないとき
は止水の機能を果さないことになるので接合部分は全て
その接着が完全であるか否かの検査が品質保証上必要と
なる。
If even a part of the bonded joint is not completely bonded, the water stop function will not be achieved, so it is necessary to inspect all bonded parts to see if the bond is complete for quality assurance purposes.

従来は目視により判断する程度であったり、接合部シー
ト間にドライバー等を突込みその突込み具合で接着状態
を判断する人間の勘と経験にたよる方法がとられてきた
が、近年超音波を利用した検査法も実行されてきた。
In the past, it was only possible to judge by visual inspection, or to rely on human intuition and experience, such as inserting a screwdriver etc. between the sheets of the joint and judging the state of adhesion based on the degree of penetration, but in recent years ultrasonic waves have been used to determine the adhesion state. Testing methods have also been implemented.

この超音波による検査法はシート接合部のシート表面に
発受信併用の超音波探触子を固定接触させ、超音波を入
射し、接触界面または”F−E底面からの反射波の強度
を検出して接着状態を推定するものであった。
In this ultrasonic inspection method, an ultrasonic probe for both transmitting and receiving functions is fixedly contacted on the sheet surface of the sheet joint, and ultrasonic waves are applied to detect the intensity of reflected waves from the contact interface or the bottom surface of F-E. The adhesion condition was estimated by

°し と しかしこの従来の超音波検査法は探触子を接合シート表
面の一部に固定接触させて局所部分のみの接着状態を検
査することができるにとどまり、接合シート表面全面に
亘ってその接着状態検査するためには探触子の位置を適
当にずらして何回となく検査する必要があった。
However, this conventional ultrasonic testing method can only inspect the adhesion state in a localized area by placing the probe in fixed contact with a part of the surface of the bonded sheet; In order to inspect the adhesion state, it was necessary to appropriately shift the position of the probe and perform the inspection several times.

そのため検査速度は極めて遅くかつ検査する者によって
その検査精度にはバラツキが生じ、結局経験つ富な有資
格者によらなければ正確な検査は望めないという欠点が
あった。
As a result, the testing speed is extremely slow and the testing accuracy varies depending on the person conducting the test, resulting in the drawback that accurate testing can only be performed by experienced and qualified personnel.

本発明はかかる点に鑑みなされたもので、その目的とす
る処は、探触子を移動しながら接合部の接着状態を連続
的に高速で検査することができる超音波連続検査装置を
供する点にある。
The present invention has been made in view of the above, and an object thereof is to provide an ultrasonic continuous inspection device that can continuously inspect the adhesion state of a joint at high speed while moving a probe. It is in.

だ  の     ゝ 本発明の構成を第1図に基づいて説明する。That's it. The configuration of the present invention will be explained based on FIG.

ゴムまたはプラスチック等のシートAI、 A2の貼り
合わせ接合部の接着状態を検査する場合に、B1および
B2はシート接合部分のシートA1の表面に接触移動さ
せる一対の超音波探触子であり、両探触子Bl、 82
の間隔は一定に維持されている。
When inspecting the adhesion state of the bonded joint of sheets AI and A2 of rubber or plastic, etc., B1 and B2 are a pair of ultrasonic probes that are moved in contact with the surface of sheet A1 at the sheet joint part. Probe Bl, 82
The interval is kept constant.

Cは一方の超音波探触子B1を発信子として超音波を発
信させる発信手段であり、Dは他方の超音波探触子B2
を受信子として超音波反射波を検出する受信手段である
C is a transmitting means for transmitting ultrasonic waves using one ultrasound probe B1 as a transmitter, and D is a transmission means for transmitting ultrasound using the other ultrasound probe B2.
This is a receiving means that detects reflected ultrasonic waves by using the receiver as a receiver.

Eは反射波の様子または異常を告知する告知手段である
E is a notification means for notifying the state or abnormality of the reflected wave.

本発明は以上のような構成のもとてシート接合部分のシ
ート^1の表面に一対の超音波探触子81゜B2を接触
しつつ移動し、一方の超音波探触子B1から超音波を該
接合部に入射し、両シートの接触界面またはより深いシ
ートA2の底面からの反射波を他方の超音波探触子B2
でとらえ、該反射波の様子または異常を告知手段Eによ
り作業者に知らせることで接着状態の検査を接合部全面
に亘って連続的に行うことができる。
According to the present invention, a pair of ultrasonic probes 81° B2 are moved while being in contact with the surface of the sheet ^1 at the sheet joining part based on the above configuration, and ultrasonic waves are emitted from one of the ultrasonic probes B1. is incident on the joint, and the reflected waves from the contact interface of both sheets or the bottom surface of the deeper sheet A2 are transmitted to the other ultrasonic probe B2.
By notifying the operator of the state or abnormality of the reflected wave using the notification means E, the bonding state can be continuously inspected over the entire surface of the joint.

1盪1 以)第2図以降に図示した本発明に係る実施例について
説明する。
1) 1) The embodiments according to the present invention illustrated in FIG. 2 and subsequent figures will be described.

本実施例において使用する超音波探触子は第2図に示す
ように超音波探触子1の先端部にゴムまたはプラスチッ
クで形成されたローラ2が枢支され同ローラ2の内部に
圧電体である発(受)信子3が内蔵されている。
As shown in FIG. 2, the ultrasonic probe used in this example has a roller 2 made of rubber or plastic pivoted at the tip of the ultrasonic probe 1, and a piezoelectric material inside the roller 2. A transmitting (receiving) transmitter 3 is built-in.

発(受)信子3はパルス信号を受けることにより超音波
を発生し、また超音波を受けることにより電気的なパル
ス信号を出力する。
The transmitter (receiver) element 3 generates ultrasonic waves by receiving pulse signals, and outputs electrical pulse signals by receiving ultrasonic waves.

したがって超音波探触子1の先端部の0−ラ2を被検査
物の表面においてころがり接触させつつ超音波を被検査
物内に入射させ、またその反射波をとらえることができ
る。
Therefore, it is possible to make the ultrasonic wave enter the object to be inspected while rolling the O-ra 2 at the tip of the ultrasonic probe 1 into contact with the surface of the object to be inspected, and to capture the reflected waves.

このような超音波探触子1をローラ間で2〜3履の間隔
をあけて2細道行方向に並列に位置させて一体に固定し
て、第3図に示すようにゴムまたはプラスチックのシー
ト4.5の接合部分においてシート4の表面上をころが
し連続的に検査するものである。
These ultrasonic probes 1 are placed in parallel between two rollers in the narrow direction with a spacing of 2 to 3 feet apart and fixed together, and a rubber or plastic sheet is attached as shown in Fig. 3. 4.5, the surface of the sheet 4 is rolled over and continuously inspected.

この一対の探触子のうち一方の探触子1aを超音波発信
子として用い、他の探触子1bを反射波受信子として用
いる。
One of the pair of probes 1a is used as an ultrasonic transmitter, and the other probe 1b is used as a reflected wave receiver.

第4図に示すように探触子1aから入射された超音波は
シート4と5の接合界面またはシート5の底面で反射さ
れ、その反射波が探触子1bによって検出される。
As shown in FIG. 4, the ultrasonic waves incident from the probe 1a are reflected at the joint interface between the sheets 4 and 5 or the bottom surface of the sheet 5, and the reflected waves are detected by the probe 1b.

その際、もし接合部の接着が完全であるときは、接合界
面での超音波の透過性が良くなることから該界面からの
反射波■1は弱まり、逆にシート5の底面からの反射波
■2が強くなる。特に同じ材質のシートを熱融着したよ
うな場合、融着が完全になされると接合界面からの反射
波■1は消失する。
At that time, if the adhesion of the joint is perfect, the ultrasonic transmittance at the joint interface will be improved, so the reflected wave 1 from the interface will be weakened, and conversely, the reflected wave from the bottom of the sheet 5 will be weaker. ■2 becomes stronger. In particular, when sheets of the same material are heat-sealed, the reflected wave (1) from the bonding interface disappears when the bonding is complete.

また接合部の接着が不完全であると、シート4と5の間
隙に空気層を含むことになり、超音波の透過性は著しく
悪くなることにより接合界面からの反射波■1が強まり
、シート5の底面からの反射波!2は弱まる。
Furthermore, if the adhesion at the joint is incomplete, an air layer will be included in the gap between the sheets 4 and 5, which will significantly reduce the ultrasonic transmittance and intensify the reflected waves 1 from the joint interface. Reflected waves from the bottom of 5! 2 weakens.

したがって接合部分の接着状態を知るためには接合界面
からの反射波■1かシート5の底面からの反射波■2の
いずれかの反射波を監視してその強度の変化をみればよ
い。
Therefore, in order to know the adhesion state of the bonded portion, it is sufficient to monitor either the reflected wave (1) from the bonding interface or the reflected wave (2) from the bottom surface of the sheet 5 and observe changes in the intensity.

また両反射波11.12の強度を検出しその比率を5っ
て接着状態を知ることもできる。
It is also possible to determine the adhesion state by detecting the intensities of both reflected waves 11 and 12 and calculating the ratio by 5.

本実施例はシート5の底面からの反射波■2の強I良変
化を監視するものである。
In this embodiment, changes in the intensity of the reflected wave (2) from the bottom surface of the sheet 5 are monitored.

第5図にその監視機構をブロック図で示しであるので同
図に基づいて説明する。
FIG. 5 shows the monitoring mechanism in block diagram form, and will be explained based on this figure.

シート4の表面に接触している発信側の探触子1aには
発信回路10が接続されていて、同発信回路10から超
音波発生用のパルスが5KH2のくり返し信号として出
力されていて、探触子1aからは超音波(05〜IMH
z)が一定周期でくり返しシート内に入射される。
A transmitting circuit 10 is connected to the transmitting probe 1a that is in contact with the surface of the sheet 4, and a pulse for generating ultrasonic waves is output from the transmitting circuit 10 as a repeated signal of 5KH2. Ultrasonic waves (05~IMH
z) is repeatedly input into the sheet at a constant period.

入射された超音波の反射波をもう一方の探触子1bでと
らえ、その検出信号は受信増幅回路11に出力され、さ
らにビデオ増幅器12により垂直増幅されてオシロスコ
ープ14の垂直方向の制御信号とされる。
The reflected wave of the incident ultrasonic wave is captured by the other probe 1b, and its detection signal is output to the reception amplifier circuit 11, and is further vertically amplified by the video amplifier 12 and used as a vertical control signal for the oscilloscope 14. Ru.

前記発信回路10からはそのくり返し信号が時間軸増幅
器13を介して増幅されて、オシロスコープ14の水平
方向の制Wa号として出力されている。
The repeated signal from the oscillator circuit 10 is amplified via a time-base amplifier 13 and outputted as a signal Wa in the horizontal direction of the oscilloscope 14.

したがって一定周期の受信反射波の強度を適当なパルス
信号波としてブラウン管で見ることができる。
Therefore, the intensity of the received reflected waves of a constant period can be viewed on a cathode ray tube as an appropriate pulse signal wave.

またビデオ増幅器12からは増幅された受信信号をゲー
ト回路15を介して時間的ゲートを経てセレクタ回路1
6に出力され、同セレクタ回路16からの信号により警
報ブザ−11が駆動されるようになっている。
Further, the amplified reception signal from the video amplifier 12 is passed through a gate circuit 15 and a time gate to the selector circuit 1.
6, and the alarm buzzer 11 is driven by the signal from the selector circuit 16.

ここで検査するシートの厚みいかんによっては反射波1
1と■2とがすぐ近接して現われ両者の分離が回能にな
ることがあるので使用する超音波の波長λとしてはシー
トの厚み1の2倍またはそれ以上のものとすることによ
り波の干渉で接合界面からの反射波■1を弱くして、シ
ート5の底面からの反射波■2のみの分離検出が容易と
なるようにしている。
Depending on the thickness of the sheet to be inspected here, the reflected wave 1
1 and ■2 may appear very close to each other, and the separation between the two may be difficult. Therefore, the wavelength λ of the ultrasonic wave used should be twice or more than the thickness 1 of the sheet to reduce the wavelength of the waves. The reflected wave (1) from the joint interface is weakened by interference, so that only the reflected wave (2) from the bottom surface of the sheet 5 can be easily separated and detected.

いま1.5睡厚のゴムシート2枚を第3図に示實ように
熱融着により接合した場合のその接着状態を検査するも
のとする。
Let us now examine the state of adhesion when two rubber sheets each having a thickness of 1.5 mm are bonded together by heat fusion as shown in FIG.

使用する超音波の波長はシートの厚み1.5mの2倍以
上ということで3.7#Iとすると、該ゴムシート内の
音速は約1850yyt /secであるのでその周波
数が0.5MHzの超音波を用いることとする。
The wavelength of the ultrasonic waves to be used is 3.7 #I because it is more than twice the thickness of the sheet, which is 1.5 m. Since the sound velocity inside the rubber sheet is approximately 1850 yyt/sec, the frequency exceeds 0.5 MHz. We will use sound waves.

このような設定で検査を行った場合のブラウン管上に現
われる反射波を模式的に表わしたものを第6図および第
7図に示す。
FIGS. 6 and 7 schematically show reflected waves that appear on the cathode ray tube when testing is performed with such settings.

第6図はシート接合部の接着が良好な場合で入射波IO
の後に若干の間(約3μs)をあけてシート5の底面か
らの強い反射波I2の一群が観測されている。
Figure 6 shows the incident wave IO when the sheet joints are well bonded.
A group of strong reflected waves I2 from the bottom surface of the sheet 5 are observed after a short interval (about 3 μs).

また第7図はシート接合部の接着が不十分な場合で、入
射波TOの後すぐに一群の反射波が表われているがこれ
は接着不良な接合界面からの反射波r1であって接着良
好ならばシート5の底面からの反射波I2が観察される
べき時間帯Aには同反射波I2は表われてない。
In addition, Figure 7 shows a case where the adhesion of the sheet joint is insufficient, and a group of reflected waves appear immediately after the incident wave TO, but this is the reflected wave r1 from the bonded interface with poor adhesion. If the condition is good, the reflected wave I2 from the bottom surface of the sheet 5 should not be observed during time period A, but the reflected wave I2 does not appear.

よってブラウン管に表われる反射波の様子を監視してい
ればシート接合部の接着状態を検査することができる。
Therefore, by monitoring the state of the reflected waves appearing on the cathode ray tube, it is possible to inspect the adhesion state of the sheet joint.

また本実施例では前記警報ブザ−17により接着不良4
分を検知することができるものである。
In addition, in this embodiment, the warning buzzer 17 is used to detect adhesion defects.
It is possible to detect the minute.

すなわちビデオ増幅器12からの増幅された反射波信号
をゲート回路15により時間的フィルタにかけて、第7
図に示した時間帯A(シート5の底面からの反射波I2
が表われるべき時間帯)における反射波のみを取り出し
、セレクタ回路16により同時間帯の反射波■2の強度
がある一定の設定値以ドにあるか否かを識別し、もし設
定値を越える強度の反射波■2がなければシート接合部
が接着不良であるとして、警報ブザ−17に信号を送り
、同警報ブザ−11を駆動させ警告することができる。
That is, the amplified reflected wave signal from the video amplifier 12 is temporally filtered by the gate circuit 15, and the seventh
Time period A shown in the figure (reflected wave I2 from the bottom of the sheet 5
The selector circuit 16 identifies whether or not the intensity of the reflected waves in the same time period is below a certain set value, and if it exceeds the set value. If there is no strong reflected wave (2), it is determined that the sheet joint is defective in adhesion, and a signal can be sent to the alarm buzzer 17 to drive the alarm buzzer 11 to issue a warning.

本実施例においてはシート接合部1mの長さを検査する
のに10秒ないし15秒を要している。
In this embodiment, it takes 10 to 15 seconds to inspect the length of the sheet joint 1m.

この同じ被検査物を従来の超音波検査方式で検査した例
を次に示す。
An example of inspecting this same object using a conventional ultrasonic inspection method is shown below.

シート接合部のシート表面をカップリング液でぬらし、
その上に発受信併用の超音波垂直型探触子を設若しオシ
ロスコープでモニターしたものである。
Wet the sheet surface at the sheet joint with coupling liquid,
On top of that, a vertical ultrasonic probe for both transmitting and receiving was installed and monitored with an oscilloscope.

検査はシート接合部1TrLにつき5aおきに20点行
った。
The inspection was carried out at 20 points every 5a for each TrL of the sheet joint.

この従来方式は連続的に検査できず、一点一点スポット
的に検査しなければならないので1TrLにつき計20
点を検査するのに5分を要した。
This conventional method cannot be inspected continuously and must be inspected spot by point, so a total of 20
It took 5 minutes to inspect the spot.

本発明に係る前記実施例では多く要したとしても15秒
でその差は大きく、特に検査面積が広い場合には相当の
時間差となる。
In the embodiment according to the present invention, even if it takes a long time, it is only 15 seconds, which is a large difference, and especially when the inspection area is large, the time difference becomes considerable.

このように本実施例によれば、作業者の労力は大幅に軽
減される。
As described above, according to this embodiment, the labor of the operator is significantly reduced.

また本実施例では連続的に検査がなされているので5r
J間隔でなされる従来のスポット的検査に比べ精度も高
い。
In addition, in this example, the inspection is carried out continuously, so the
It is also more accurate than conventional spot inspections performed at J intervals.

なお本実施例で用いたロール型探触子を単独で発受信併
用として連続検査を行ってみたが、その結果はシートの
接着状態にかかわりなく、入射波に続きノイズが強く現
われ検査不能となり、結局探触子を単独で発受信併用と
して連続検査を行うことはできなかった。
In addition, continuous testing was carried out using the roll type probe used in this example for both transmitting and receiving, but the results showed that regardless of the adhesive state of the sheet, strong noise appeared following the incident wave, making testing impossible. In the end, it was not possible to perform continuous testing using the probe alone for both transmitting and receiving purposes.

次に探触子とシート面との密着性を良くするためにカッ
プリング液を使用し該カップリング液を用いたため生じ
る誤信号を除去するために周波数検波器を用いた別の実
施例について説明する。
Next, we will explain another example in which a coupling liquid is used to improve the adhesion between the probe and the sheet surface, and a frequency detector is used to remove erroneous signals caused by using the coupling liquid. do.

第8図に示すようにシート表面にカップリング液20を
ぬり、その上に超音波探触子1をおくことにより超音波
探触子1とシート面との密着性を良くして余分なノイズ
の発生を防止しようとするものであるが実際は両探触子
1a、 Ib間の液溜りを介して超音波が伝わり妨害信
号として検出されることになる。
As shown in Fig. 8, by applying coupling liquid 20 on the sheet surface and placing the ultrasonic probe 1 on top of it, the adhesiveness between the ultrasonic probe 1 and the sheet surface is improved and excess noise is eliminated. However, in reality, the ultrasonic waves are transmitted through the liquid pool between the two probes 1a and Ib and are detected as interference signals.

そこで第9図に示すように受信増幅回路11とビデオ増
幅器12どの間に周波数検波器21を挿入して、探触子
1bで検出した信号の増幅信号を周波数検波器21に通
して前記妨害信号を除去しようとするものである。
Therefore, as shown in FIG. 9, a frequency detector 21 is inserted between the receiving amplifier circuit 11 and the video amplifier 12, and the amplified signal of the signal detected by the probe 1b is passed through the frequency detector 21 to generate the interference signal. This is an attempt to remove the .

周波数検波器21は2〜5にHzの帯域幅をもち、ブラ
ウン管を見ながら中心周波数を200KHzから750
KHzにかけて変化させて液溜りによる妨害信号が消え
るように調節する。
The frequency detector 21 has a bandwidth of 2 to 5 Hz and changes the center frequency from 200 KHz to 750 KHz while looking at the cathode ray tube.
KHz and adjust it so that the interference signal due to the liquid pool disappears.

このような設定で検査を行った場合のブラウン管上に現
われる反射波を模式的に表わしたものを第10図および
第11図に示す。
FIGS. 10 and 11 schematically show reflected waves appearing on the cathode ray tube when testing is performed with such settings.

第10図はシート接合部の接着状態が良好な場合で、第
11図は不十分な場合のもので、その差は前記実施例よ
りもより鮮明に表われている。
FIG. 10 shows the case where the adhesion state of the sheet joints is good, and FIG. 11 shows the case where it is insufficient, and the difference is more clearly seen than in the previous example.

なお周波数検波器21を用いた場合、特に強い妨害信号
がないときでも検出信号を顕示化し、検出信号の感度を
向上させるのに役立つものである。
Note that when the frequency detector 21 is used, it is useful for making the detection signal visible even when there is no particularly strong interfering signal and improving the sensitivity of the detection signal.

l団夏匁1 本発明はシート接合部の接着状態を連続的に検査するこ
とができ検査に要する時間を大幅に減縮でき、作業者の
労力を軽減できる。
The present invention allows continuous inspection of the adhesion state of sheet joints, greatly reduces the time required for inspection, and reduces the labor of the operator.

またシート接合部をスポット的に検査する従来のものに
比べ、連続的に検査できるので精度が高く、さらに未経
験者であっても検査作業を行うことがh1能である。
In addition, compared to the conventional method in which sheet joints are inspected spot-wise, the inspection can be performed continuously, resulting in higher accuracy, and even inexperienced personnel can perform the inspection work easily.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明のクレーム対応図、第2図はローラ型超
音波探触子を示す図、第3図は本実施例における超音波
探触子による検査方法を示す図、第4図は超音波の伝達
経路を示す図、第5図は本実施例の装置の概略ブロック
図、第6図、第7図は本実施例の反射波の様子を示す図
、第8図はシート表面にカップリング液をぬった場合の
超音波の伝達経路を示す図、第9図は別の実施例の装置
の概略ブロック図、第10図、第11図は同実施例にお
ける反射波の様子を示す図である。 1・・・超音波探触子、2・・・ローラ、3・・・発(
受)信子、4,5・・・シート、 10・・・発信回路、11・・・受信増幅回路、12・
・・ビデオ増幅器、13・・・時間軸増幅器、14・・
・オシロスコープ、15・・・ゲート回路、16・・・
セレクタ回路、17・・・警報ブザ−, 20・・・カップリング液、21・・−周波数検波器。
Fig. 1 is a diagram corresponding to the claims of the present invention, Fig. 2 is a diagram showing a roller-type ultrasonic probe, Fig. 3 is a diagram showing an inspection method using the ultrasonic probe in this embodiment, and Fig. 4 is a diagram showing the inspection method using the ultrasonic probe in this embodiment. FIG. 5 is a schematic block diagram of the device of this embodiment. FIGS. 6 and 7 are diagrams showing the reflected waves of this embodiment. FIG. 8 is a diagram showing the transmission path of ultrasonic waves. A diagram showing the transmission path of ultrasonic waves when a coupling liquid is applied, FIG. 9 is a schematic block diagram of the device of another embodiment, and FIGS. 10 and 11 show the state of reflected waves in the same embodiment. It is a diagram. 1...Ultrasonic probe, 2...Roller, 3...Emission (
Receiving) signal element, 4, 5... sheet, 10... transmitting circuit, 11... receiving amplifier circuit, 12...
...Video amplifier, 13...Time base amplifier, 14...
・Oscilloscope, 15... Gate circuit, 16...
Selector circuit, 17...Alarm buzzer, 20...Coupling liquid, 21...-Frequency detector.

Claims (1)

【特許請求の範囲】[Claims] ゴムまたはプラスチック等のシート貼り合わせ接合部分
のシート表面に一定の間隔をあけて接触移動させる一対
の超音波探触子と、そのうちの一方の超音波探触子を発
信子として超音波を発信させる発信手段と、他方の超音
波探触子を受信子として超音波反射波を検出する受信手
段と、反射波の様子または異常を告知する告知手段とを
備え、シート接合部の接着状態を連続的に非破壊検査す
ることができることを特徴とするシート接合部の超音波
連続非破壊検査装置。
A pair of ultrasonic probes is moved in contact with the surface of the sheet where sheets of rubber or plastic are bonded together at a fixed interval, and one of the ultrasonic probes is used as a transmitter to emit ultrasonic waves. It is equipped with a transmitting means, a receiving means for detecting ultrasonic reflected waves using the other ultrasonic probe as a receiver, and a notifying means for notifying the state or abnormality of the reflected waves, and continuously monitors the adhesion state of the sheet joint. An ultrasonic continuous non-destructive testing device for sheet joints, characterized in that it is capable of non-destructive testing of sheet joints.
JP60008423A 1985-01-22 1985-01-22 Continuous non-destructive ultrasonic inspection device for sheet joint Pending JPS61169758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60008423A JPS61169758A (en) 1985-01-22 1985-01-22 Continuous non-destructive ultrasonic inspection device for sheet joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60008423A JPS61169758A (en) 1985-01-22 1985-01-22 Continuous non-destructive ultrasonic inspection device for sheet joint

Publications (1)

Publication Number Publication Date
JPS61169758A true JPS61169758A (en) 1986-07-31

Family

ID=11692717

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60008423A Pending JPS61169758A (en) 1985-01-22 1985-01-22 Continuous non-destructive ultrasonic inspection device for sheet joint

Country Status (1)

Country Link
JP (1) JPS61169758A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55116255A (en) * 1979-02-28 1980-09-06 Sumitomo Metal Ind Ltd Method and apparatus for detecting void in synthetic resin coating material
JPS56164953A (en) * 1980-05-26 1981-12-18 Toyota Central Res & Dev Lab Inc Ultrasonic inspecting device for junction part
JPS5821558A (en) * 1981-07-31 1983-02-08 Kyoei Giken:Kk Supersonic wave flaw detector for nonmetal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55116255A (en) * 1979-02-28 1980-09-06 Sumitomo Metal Ind Ltd Method and apparatus for detecting void in synthetic resin coating material
JPS56164953A (en) * 1980-05-26 1981-12-18 Toyota Central Res & Dev Lab Inc Ultrasonic inspecting device for junction part
JPS5821558A (en) * 1981-07-31 1983-02-08 Kyoei Giken:Kk Supersonic wave flaw detector for nonmetal

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