JPH05340880A - Method and device for inspecting coating on pipe for flaw - Google Patents
Method and device for inspecting coating on pipe for flawInfo
- Publication number
- JPH05340880A JPH05340880A JP17495392A JP17495392A JPH05340880A JP H05340880 A JPH05340880 A JP H05340880A JP 17495392 A JP17495392 A JP 17495392A JP 17495392 A JP17495392 A JP 17495392A JP H05340880 A JPH05340880 A JP H05340880A
- Authority
- JP
- Japan
- Prior art keywords
- camera
- sensitivity
- fusion
- fluorescence
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8422—Investigating thin films, e.g. matrix isolation method
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/8422—Investigating thin films, e.g. matrix isolation method
- G01N2021/8427—Coatings
Landscapes
- 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)
- Mathematical Physics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、被覆管被覆部融着不良
の検査方法および装置、詳しくは銅管の上に発泡シ−ト
を巻き付け、シ−トの端部を熱融着することにより成形
する被覆銅管被覆部の融着不良の検査方法および装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inspecting for defective fusion of a coated portion of a cladding tube, and more specifically, winding a foamed sheet on a copper tube and heat-sealing the end portion of the sheet. TECHNICAL FIELD The present invention relates to a method and an apparatus for inspecting a fusion defect of a coated copper pipe coating portion formed by.
【０００２】[0002]
【従来の技術】冷暖兼用エアコンの冷媒流通用配管とし
て、例えば、銅管の上に保温層となるポリエチレンシ−
トを巻き付けてシ−トの端部を熱融着し、さらにその上
にポリエチレンの表皮層を設けた被覆銅管が使用されて
いる。2. Description of the Related Art As a refrigerant distribution pipe for a cooling and heating air conditioner, for example, a polyethylene sheet forming a heat insulation layer on a copper pipe is used.
A coated copper tube is used in which a sheet is wound to heat-seal the end of the sheet and a polyethylene skin layer is further provided on the sheet.
【０００３】熱融着が不完全であると保温効果が十分で
なくなり商品価値も損なわれるから、融着部の検査が必
要となるが、従来融着部の検査は目視で行われていたた
め、検査作業に手間と時間を要し、被覆銅管製造の能率
低下の原因となっていた。If the heat fusion is incomplete, the heat retaining effect is not sufficient and the commercial value is impaired. Therefore, it is necessary to inspect the fusion zone, but conventionally, the inspection of the fusion zone was performed visually. The inspection work requires labor and time, which causes a decrease in the efficiency of producing the coated copper tube.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、被覆銅管の
被覆層に紫外線を照射するとその一部は再び光として外
へ放出されること、さらに被覆銅管の表皮を形成するポ
リエチレンなど非発泡プラスチックの表皮層と融着不十
分な場合に表面に現れる発泡ポリエチレン層などの発泡
プラスチック層とでは、紫外線吸収による発光状態に差
があることを知見したことに基づいて開発されたもの
で、その目的とするところは、被覆管被覆の融着不良部
の位置および大きさを自動的に検査する方法および装置
を提供することにある。DISCLOSURE OF THE INVENTION According to the present invention, when the coating layer of a coated copper tube is irradiated with ultraviolet rays, a part of it is emitted again as light, and further, polyethylene or the like that forms the skin of the coated copper tube is not used. It was developed based on the finding that there is a difference in the light emission state due to ultraviolet absorption between the skin layer of foamed plastic and the foamed plastic layer such as the foamed polyethylene layer that appears on the surface when fusion is insufficient. It is an object of the present invention to provide a method and apparatus for automatically inspecting the position and size of a defective fusion-bonded portion of a cladding coating.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するた
めの本発明による被覆管被覆部融着不良の検査方法は、
被覆管被覆融着部に紫外線を照射し、発生する蛍光を高
感度ＴＶカメラで検知して、信号処理手段を介して融着
不良部の位置および大きさを表示することを構成上の特
徴とする。また、被覆管被覆融着部に投光するための紫
外線照射装置と、紫外線照射により発生する蛍光線を検
知する高感度ＴＶカメラと、高感度ＴＶカメラからの信
号を処理する信号処理装置と、処理された信号に基づい
て融着不良部の位置および大きさを表示する表示装置か
らなることを装置構成上の特徴とする。In order to achieve the above object, a method for inspecting a cladding tube fusion-bonding defect according to the present invention comprises:
The constitutional feature is that the fusion-bonded portion of the cladding tube is irradiated with ultraviolet rays, the generated fluorescence is detected by the high-sensitivity TV camera, and the position and size of the defective fusion-bonded portion are displayed through the signal processing means. To do. Further, an ultraviolet irradiation device for projecting light onto the cladding fusion-bonded portion, a high-sensitivity TV camera for detecting fluorescent rays generated by the ultraviolet irradiation, and a signal processing device for processing a signal from the high-sensitivity TV camera, A feature of the device configuration is that the display device is configured to display the position and size of the defective fusion portion based on the processed signal.
【０００６】[0006]
【作用】本発明は、上記の構成により、被覆管被覆融着
部に照射された紫外線は、被覆層の化学成分を励起して
蛍光を発生する。この蛍光の強度は、照射された紫外線
が融着不良部で露出している発泡ポリエチレン層に吸収
された場合に大きく、不良部の大きさと相関関係を有し
ている。したがって、高感度ＴＶカメラで発生する蛍光
を検知し、信号処理手段で処理して融着不良部の大きさ
として表示することができる。また、被覆管を一定速度
で走行させながら紫外線を照射することにより、自動的
に融着不良部の位置および大きさを検査することが可能
となる。According to the present invention, with the above-mentioned structure, the ultraviolet rays applied to the coating tube fusion-bonded portion excite the chemical components of the coating layer to generate fluorescence. The intensity of this fluorescence is large when the irradiated ultraviolet rays are absorbed by the foamed polyethylene layer exposed at the defective fusion portion, and has a correlation with the size of the defective portion. Therefore, the fluorescence generated by the high-sensitivity TV camera can be detected, processed by the signal processing means, and displayed as the size of the defective fusion portion. Further, by irradiating the coating tube with ultraviolet rays while traveling at a constant speed, it becomes possible to automatically inspect the position and size of the defective fusion portion.
【０００７】[0007]
【実施例】以下、本発明を実施例に基づいて説明する。 実施例 図１は本発明による検査装置の構成と配置を示した説明
図である。図１において、１は紫外線照射装置、２は高
感度ＴＶカメラ、３は信号処理装置、４は表示装置であ
るモニタ−、Ｔは被覆銅管である。EXAMPLES The present invention will be described below based on examples. Embodiment FIG. 1 is an explanatory diagram showing the configuration and arrangement of an inspection apparatus according to the present invention. In FIG. 1, 1 is an ultraviolet irradiation device, 2 is a high-sensitivity TV camera, 3 is a signal processing device, 4 is a monitor which is a display device, and T is a coated copper tube.
【０００８】紫外線照射装置より照射される紫外線の波
長は330 〜390nm の範囲が好ましく、波長をこの範囲に
調整するための分光器が付設されている。紫外線を照射
することにより、正常部であるポリエチレン表皮層は紫
色に発光し、発泡ポリエチレンの保温層が露出している
融着不良部は白色に発光する。この白色に発光した蛍光
のみを光学フィルタ−により透過させ、高感度ＴＶカメ
ラで撮影する。この場合、融着不良部からの蛍光のみを
際立たせるため、450 〜600nm 波長を透過する光学フィ
ルタ−５を高感度ＴＶカメラ２のレンズ側に装着する。The wavelength of the ultraviolet light emitted from the ultraviolet irradiation device is preferably in the range of 330 to 390 nm, and a spectroscope for adjusting the wavelength to this range is additionally provided. Upon irradiation with ultraviolet rays, the polyethylene skin layer, which is the normal portion, emits purple light, and the defective fusion-bonding portion where the heat retaining layer of the foamed polyethylene is exposed emits white light. Only the fluorescent light emitted in white is transmitted by an optical filter and photographed with a high-sensitivity TV camera. In this case, an optical filter 5 which transmits a wavelength of 450 to 600 nm is attached to the lens side of the high-sensitivity TV camera 2 in order to highlight only the fluorescence from the defective fusion portion.
【０００９】信号処理装置３は、高感度ＴＶカメラ２か
らの信号を処理するためのもので、信号増幅のための積
分回路ユニット、紫外線照射光の分布の影響を除去する
ためのバックグランド減算ユニット、蛍光強度と融着不
良部の大きさとを一定の相関関係とするためのユニット
などから構成される。表示装置４は、高感度ＴＶカメラ
２で撮影した融着不良部の位置、大きさを画面上に表示
するものである。The signal processing device 3 is for processing the signal from the high-sensitivity TV camera 2, and is an integrating circuit unit for amplifying the signal and a background subtracting unit for removing the influence of the distribution of the ultraviolet irradiation light. , A unit for establishing a fixed correlation between the fluorescence intensity and the size of the defective fusion portion. The display device 4 displays the position and size of the defective fusion portion photographed by the high-sensitivity TV camera 2 on the screen.
【００１０】紫外線照射装置１と高感度ＴＶカメラ２の
投受光配置は、高感度ＴＶカメラ２を紫外線照射装置１
による紫外線の照射軸に対して90°以内の角度位置とす
るのが好ましい。これは紫外線照射装置からの光が直接
ＴＶカメラに入射することによる検出誤差を防止するた
めであり、両者を直角に配置する方式または同一方向か
ら投受光する配置方式をとるのが好ましい。The UV irradiation device 1 and the high-sensitivity TV camera 2 are arranged so that the high-sensitivity TV camera 2 is placed in the UV irradiation device 1.
It is preferable that the angle position is within 90 ° with respect to the irradiation axis of the ultraviolet rays. This is to prevent a detection error due to the light from the ultraviolet irradiation device directly entering the TV camera, and it is preferable to adopt a method of arranging both at a right angle or an arrangement method of projecting and receiving light from the same direction.
【００１１】銅管(JIS H3300 C1220T-O)に発泡ポリエチ
レン(30 倍発泡) の内層および外層を巻き付けてその端
部を熱融着しポリエチレン表皮層を設けた被覆銅管に、
融着不良部（程度大および程度小）を人工的に形成し、
本発明の検査装置を適用して表示装置に融着不良部を表
示した。図２は表示画面に写し出された蛍光の輝度分布
で、不良部（程度大）位置にピ−クが現れている。図３
は程度小の融着不良部についての輝度分布であり、図２
に比べやや低いピ−クが認められる。A copper tube (JIS H3300 C1220T-O) was wrapped with an inner layer and an outer layer of expanded polyethylene (30 times foam), and the ends were heat-sealed to a coated copper tube provided with a polyethylene skin layer.
Artificially formed defective fusion parts (large and small),
By applying the inspection device of the present invention, the defective fusion portion is displayed on the display device. FIG. 2 shows the luminance distribution of the fluorescent light projected on the display screen, and a peak appears at the defective portion (large degree). Figure 3
2 is a luminance distribution for a small fusion defect portion, and FIG.
A slightly lower peak is recognized as compared with.
【００１２】[0012]
【発明の効果】以上のとおり、本発明の検査方法および
装置によれば、従来目視によっていた被覆管被覆融着不
良部の検査を自動的に検査する方式に変えることが可能
となり、被覆管製造の能率向上が期待される。As described above, according to the inspection method and apparatus of the present invention, it is possible to change the conventional visual inspection of cladding fusion defects to the automatic inspection system. Is expected to improve efficiency.
【図１】本発明の検査装置の構成および配置を示した説
明図である。FIG. 1 is an explanatory diagram showing the configuration and arrangement of an inspection device of the present invention.
【図２】本発明の検査装置を適用して表示した融着不良
部の蛍光線輝度分布を示す図である。FIG. 2 is a diagram showing a fluorescent line luminance distribution of a defective fusion portion displayed by applying the inspection device of the present invention.
【図３】本発明の検査装置を適用して表示した融着不良
部の蛍光線輝度分布を示す図である。FIG. 3 is a diagram showing a fluorescent line luminance distribution of a defective fusion portion displayed by applying the inspection apparatus of the present invention.
１ 紫外線照射装置 ２ 高感度ＴＶカメラ ３ 信号処理装置 ４ 表示装置 ５ 光学フィルタ− Ｔ 被覆管 1 UV Irradiation Device 2 High Sensitivity TV Camera 3 Signal Processing Device 4 Display Device 5 Optical Filter-T Cladding Tube
Claims (2)
生する蛍光を高感度ＴＶカメラで検知して、信号処理手
段を介して融着不良部の位置および大きさを表示するこ
とを特徴とする被覆管被覆部融着不良の検査方法。1. A method of irradiating ultraviolet rays to a fusion-bonded portion of a cladding tube, detecting the generated fluorescence with a high-sensitivity TV camera, and displaying the position and size of the defective fusion-bonded portion via a signal processing means. A method for inspecting for defective fusion of the cladding of the cladding.
線照射装置と、紫外線照射により発生する蛍光を検知す
る高感度ＴＶカメラと、高感度ＴＶカメラからの信号を
処理する信号処理装置と、処理された信号に基づいて融
着不良部の位置および大きさを表示する表示装置からな
ることを特徴とする被覆管被覆融着不良の検査装置。2. An ultraviolet irradiating device for projecting light onto the cladding fusion-bonded portion, a high-sensitivity TV camera for detecting fluorescence generated by ultraviolet irradiation, and a signal processing device for processing signals from the high-sensitivity TV camera And a display device that displays the position and size of the defective fusion portion based on the processed signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17495392A JPH05340880A (en) | 1992-06-09 | 1992-06-09 | Method and device for inspecting coating on pipe for flaw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17495392A JPH05340880A (en) | 1992-06-09 | 1992-06-09 | Method and device for inspecting coating on pipe for flaw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05340880A true JPH05340880A (en) | 1993-12-24 |
Family
ID=15987627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17495392A Pending JPH05340880A (en) | 1992-06-09 | 1992-06-09 | Method and device for inspecting coating on pipe for flaw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05340880A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006078435A1 (en) * | 2005-01-21 | 2006-07-27 | Innovative Productivity, Inc. | Fluorescent coating void detection system and method |
-
1992
- 1992-06-09 JP JP17495392A patent/JPH05340880A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006078435A1 (en) * | 2005-01-21 | 2006-07-27 | Innovative Productivity, Inc. | Fluorescent coating void detection system and method |
| US7105834B2 (en) | 2005-01-21 | 2006-09-12 | Innovative Productivity, Inc. | Fluorescent coating void detection system and method |
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