JPS6020141A - Pin-hole detecting device of paint coated conductor - Google Patents
Pin-hole detecting device of paint coated conductorInfo
- Publication number
- JPS6020141A JPS6020141A JP12700683A JP12700683A JPS6020141A JP S6020141 A JPS6020141 A JP S6020141A JP 12700683 A JP12700683 A JP 12700683A JP 12700683 A JP12700683 A JP 12700683A JP S6020141 A JPS6020141 A JP S6020141A
- Authority
- JP
- Japan
- Prior art keywords
- enameled wire
- water
- pin
- wire
- 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
- G01N27/205—Investigating the presence of flaws in insulating materials
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth 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 Electric Means (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
Description
【発明の詳細な説明】 ［花明の技術分野］ 本発明は塗料被覆導線のピンホール検知装置に関する。[Detailed description of the invention] [Hanamei's technical field] The present invention relates to a pinhole detection device for a paint-coated conductor.
し発明の技術的背景］
塗料被Ｉｎ線の１つであるエナメル線のピンホール検知
は、従来、たとえば第１図に示すようにして行なってい
た。図中１は電圧源、２は食塩水〜Ｉ−フェノールフタ
レイン溶液（電解液）の檜、３はエナメル線である。電
圧源、１の一端子は槽２の溶液中に浸漬され、ト端子に
はエナメル線３の一端の導体部分が接続されている。TECHNICAL BACKGROUND OF THE INVENTION Pinhole detection in an enamelled wire, which is one type of In wire coated with paint, has conventionally been carried out as shown in FIG. 1, for example. In the figure, 1 is a voltage source, 2 is a saline solution to I-phenolphthalein solution (electrolytic solution), and 3 is an enameled wire. One terminal of the voltage source 1 is immersed in the solution in the bath 2, and the conductor portion of one end of the enamelled wire 3 is connected to the terminal G.
そしてエナメル線３の一部を槽２内の溶液中に浸漬する
ことによって、溶液中のエナメル線３の被覆にピンホー
ルがあると、そのビンホールの近傍にＯＨ−イオンが集
中して、そこが局部的にアルカリとなって、溶液中のフ
ェノールフタレインによ・つて赤色に変色し、かくして
、エナメル線３の被覆にピンホールがあることが（ＩＴ
「認される。Then, by immersing a part of the enameled wire 3 into the solution in the tank 2, if there is a pinhole in the coating of the enameled wire 3 in the solution, OH- ions will concentrate near the pinhole, and the OH- ions will concentrate there. It locally becomes alkali and changes color to red due to phenolphthalein in the solution, thus causing pinholes in the coating of the enameled wire 3 (IT).
“Recognized.
［背景技術の問題点］
近年品質向上の面から製品全長にわたりピンホールを検
知することが要求されている・。しかしながら、上述の
ような検知方法では、時間がかかり、しかも製品（被覆
）を破壊するおぞれがあるので、現実的には、エナメル
線の一部しか検知（検査）することができない。[Problems with the background technology] In recent years, in order to improve quality, it has become necessary to detect pinholes over the entire length of the product. However, the above-described detection method is time-consuming and involves drooping that destroys the product (coating), so in reality, only a portion of the enamelled wire can be detected (inspected).
［発明の目的］
そこで本発明は以上のような問題を考慮してなされたも
ので、その被覆を破壊りることなく製品（塗料被覆導線
）全長にわたって効率よくピンホール検知が行なえる装
置を提供づることを目的としている。[Object of the Invention] The present invention has been made in consideration of the above-mentioned problems, and provides a device that can efficiently detect pinholes over the entire length of a product (paint-coated conductor) without destroying the coating. The purpose is to write.
１光明の概要１
本発明は、送出ボビンと、前記送出ボビンに巻かれた塗
料被覆導線を巻取る巻取ボビンと、前記両ボビンの間に
設りられｌ〔導電性液体の槽と、前記槽内の導電性液体
中に配された電極と、２つの入力端の各々に前記電極お
よび前記塗１′３Ｉ被覆導線の一端の導体部分の各々が
接続され、前記２つの入力端間の抵抗値変化を検出リー
る導通検出装置とを備えた塗料被覆導線のピンホール検
知装置である。1 Overview of Komei 1 The present invention provides a delivery bobbin, a take-up bobbin for winding a paint-coated conductive wire wound on the delivery bobbin, and a conductive liquid tank provided between the two bobbins. The electrode and the conductor portion of one end of the coated 1'3I coated conductor are connected to each of the two input ends of the electrode disposed in the conductive liquid in the tank, and the resistance between the two input ends is This is a pinhole detection device for a paint-coated conducting wire, which is equipped with a continuity detection device that detects a value change.
［発明の実施例］
第２図は本発明にかかる検知装置の槽の部分の［ｉ面図
である。図中４は、内側槽４ａおよび外側槽４ｂからな
る二重構造を持つ水槽であり、その内側槽４ａ内には、
水が充填されている。[Embodiments of the Invention] FIG. 2 is an i-plane view of the tank portion of the detection device according to the present invention. 4 in the figure is a water tank with a double structure consisting of an inner tank 4a and an outer tank 4b, and inside the inner tank 4a,
Filled with water.
内側槽４ ａの両端壁および外側槽４ｂの両端壁には貫
通孔が同一高さに各々形成されこれら貫通孔中を被測定
用のエナメル線３が水平に貫通している。このエナメル
線の両端は、水槽４の両件側に配置された送出ボビン（
図示Ｕず）おＪ：び巻取ボビン（図示けず）に各々巻取
られ、両ボビン間においてエナメル線３は水平に張設さ
れている。Through holes are formed at the same height in both end walls of the inner tank 4a and in both end walls of the outer tank 4b, and the enameled wire 3 to be measured passes horizontally through these through holes. Both ends of this enameled wire are attached to the delivery bobbins (
The enameled wire 3 is wound on a take-up bobbin (not shown), and the enameled wire 3 is stretched horizontally between the two bobbins.
そし゛（、送出ボビンに巻かれτいたエナメル線３を巻
戻して（送出して）巻取ボビンに巻取ることによって、
そのエナメル線３の全長が内側槽／Ｉａ内の水中を通過
する（図中では、矢印で示すように右から左に移動覆る
）。Then, by unwinding (feeding out) the enameled wire 3 that has been wound on the delivery bobbin and winding it on the take-up bobbin,
The entire length of the enameled wire 3 passes through the water in the inner tank/Ia (in the figure, it moves from right to left as indicated by the arrow).
内側槽４ａの両端壁の貫通孔には、水漏れ防止用のゴム
パツキン５が取イ」けられでおり、内側槽４ａ内には、
その内側の水中を水平に通っているエナメル線３の上Ｆ
に近接して位置−ｓｌるＪ、うに１対の電極６が固定さ
れている。１対の電（（６は、エナメル線３の高さくの
変化）に合わｌられるように、昇降手段（図示せず）に
よって昇降可能になっている。また、１対の電極６の各
々は、エナメル線のりイズに対応ひきるように、変更手
段（図示せず）によってｎいにその間の間隔が変更可能
になっている。Rubber gaskets 5 for preventing water leakage are removed from the through holes in both end walls of the inner tank 4a, and inside the inner tank 4a,
Above F of the enameled wire 3 that runs horizontally through the water inside
A pair of electrodes 6 are fixed at position -sl in the vicinity of . Each of the pair of electrodes 6 can be raised and lowered by a lifting means (not shown) so as to match the height of the enameled wire 3. , the spacing between them can be changed by changing means (not shown) so as to correspond to the size of the enameled wire.
外側４ｆｆ ／１． ｂ内には水が外から供給され、し
かも外側１ｆＩｉ／Ｉｂ内には、ポンプ７およびこのポ
ンプ７によって吸」二げられた外側槽４ｂ内の水を内側
槽４ａ内に補給りる管８が設（〕られている。またエナ
メル線３の下流側におりる外側ＩＷ４ｂの外側に（３１
、ブ］−１ワー９が設りられ、このゾロワー９によって
、内側槽４ａ内の水に接して濡れたエナメル粍１３を乾
燥さける１゜
第２図は本発明にがかる導通検出装置の構成図である。Outside 4ff/1. Water is supplied from the outside to inside b, and in addition, inside 1fIi/Ib on the outside, there is a pump 7 and a pipe 8 for replenishing the water in the outside tank 4b sucked by the pump 7 into the inside tank 4a. (31
, B]-1 is provided, and the enamel 13 which has come into contact with the water in the inner tank 4a is dried by this lowerer 9. FIG. 2 is a block diagram of the continuity detection device according to the present invention. It is.
図示されるｊ、うに１０は変圧器であり、この変圧器１
０の１次側（Ｊ商用電源に接続され、２次側には直流の
低電圧回路（整流回路を含む）１０が接続されている。10 shown in the figure is a transformer, and this transformer 1
The primary side (J) of 0 is connected to a commercial power source, and the secondary side is connected to a DC low voltage circuit (including a rectifier circuit) 10.
低電ＩＴ−回路１０の−ｈの出力端（［〜側）は、抵抗
１２を介して、電１カ６およびコンパレータ１３の一方
の入ツノ端に接続されている。The -h output terminal ([~ side) of the low-voltage IT-circuit 10 is connected to the input terminal of the power supply 6 and one of the comparator 13 via the resistor 12 .
低電圧回路１０の他方の出力端（−側）は、接地されて
いる。送出ボビン１４に巻かれているエナメル線３の一
端の導体部分も接地されている。The other output end (- side) of the low voltage circuit 10 is grounded. The conductor portion at one end of the enameled wire 3 wound around the delivery bobbin 14 is also grounded.
コンパレータ１３の他方の入力端には、比較用一定直流
電圧（定電圧化されている）が、電ｊ十設定器１５を介
して入力されている。コンパレータ１３の出力端は、一
方の入力端の電圧が他方の入力端の電圧Ｊ：り下がった
ときに電圧オフどなり、それまでは電圧Ａン（一定電圧
）になっている。A constant comparison DC voltage (constant voltage) is input to the other input terminal of the comparator 13 via a voltage setting device 15. The output terminal of the comparator 13 turns off when the voltage at one input terminal drops to the voltage J: at the other input terminal, and remains at the voltage A (constant voltage) until then.
コンパレータ１３の出力端はＮ’ ＯＴ回路１６を介し
て警報手段としてのブザー１７に接続されている。The output terminal of the comparator 13 is connected via an N'OT circuit 16 to a buzzer 17 as an alarm means.
なお、第４図に示づにうに送出ボビン１４のフランジ１
４ａの外側には、環状の導電性の電極板１８が取イ］け
られ、この電極板１８にブラシ１９が押圧接触しており
、電極板１８に ・送出ボビン１４に巻かれているエナ
メル線３の一端のシワ体部分が接続されている。In addition, as shown in FIG. 4, the flange 1 of the delivery bobbin 14
A ring-shaped conductive electrode plate 18 is placed on the outside of the electrode plate 4a, and a brush 19 is in pressure contact with this electrode plate 18. The wrinkle body part at one end of 3 is connected.
以」−のような椙成によって、次のｊ、うにして、エナ
メル線３のピンホールが検知される。すなわら、まず、
送出ボビン１４１こ巻かれた１ナメル線３を・、送出し
Ｃ内側４ｆ’ｌ ７１ａ内の水中を走行させ、巻取ボビ
ンに巻取る。この際、エナメル線３の、内側ＩＱ ４
ａ内の水中におりる部分の？ＩＵ Ｉに、ピンホールが
ないと、電極６とエナメル線３との間の抵抗（１０が実
質的に無限大なので、電極６と接地との間の電圧（ま、
定電圧回路１０の出力定電圧と同じになっている。しか
し、走行中のエナメル線３の内側槽４ａ内の水中におり
る部分の被覆にピンボールがあると、そのピンホールを
介して水がエナメル線３の被覆の内側の導体に接触し、
その結果、電極６とエナメル線３の導体（１なわち接地
）との間の抵抗値は、低くなる。したがって、たとえば
、抵抗１２の抵抗値ｉ ｏ ｏ Ｋ Ｑ、定電圧回路１
０の出力定電圧１０Ｖ、コンパレータ１３の他Ｉｊの入
力端におりる比較用一定り°１流電圧５Ｖ、ピンボール
があるときのエナメル線３と電極６との間の抵抗値２０
Ｋ Ｏとづると、電極６と接地との間の電圧Ｅは、
Ｅ −１０Ｘ ２ ０ ｋ ／ （１００ｋ ＋ ２
０ ｋ ） ＝５／３＝１．６７ （Ｖ）
となる（なＪｊ、水の抵抗１直は、距ｆｌｌｆｆ０．１
〜１ｍｍで１０〜２０ＫＯ′ｃある）。このように、内
側槽４ａ内の水中を通過中のエナメル線３にピンホール
があると、］コンパレータ３の一方の入力端の電圧が急
激に低下する（上記例では、１０Ｖから１．６７Ｖにイ
ｌ（’Ｔ’ する）。このため、コンパレータ１３の他
方の入力端の電圧を所定のレヘル（たとえば５Ｖ）に設
定しておくことによって、一方の入力端の電圧が５ｖ以
下になったときにその出ツノ端の電圧がＡノになり、そ
の結果、ＮＯＴ回路１６を介してブザー１７が駆動され
、エナメル線３の、内側槽４ａ内の水中を走行中の部分
にピンホールがあることがわかる。Due to this formation, the pinhole in the enamelled wire 3 is detected in the following manner. That is, first of all,
The 1-namel wire 3 wound around the delivery bobbin 141 is made to run through water inside the delivery C inner side 4f'l 71a and wound onto the take-up bobbin. At this time, the inner IQ of the enameled wire 3 is 4
The part that goes down into the water in a? If there is no pinhole in IU I, the resistance (10) between the electrode 6 and the enameled wire 3 is practically infinite, so the voltage between the electrode 6 and the ground (well,
It is the same as the output constant voltage of the constant voltage circuit 10. However, if there is a pinball in the coating of the part of the enameled wire 3 that is running under water in the inner tank 4a, water will come into contact with the conductor inside the coating of the enameled wire 3 through the pinhole.
As a result, the resistance value between the electrode 6 and the conductor (1, ie, ground) of the enameled wire 3 becomes low. Therefore, for example, the resistance value i o o K Q of the resistor 12, the constant voltage circuit 1
0 constant output voltage 10V, constant current voltage 5V for comparison that goes to the input terminal of comparator 13 and Ij, resistance value 20 between enameled wire 3 and electrode 6 when there is a pinball.
Spelled as KO, the voltage E between the electrode 6 and the ground is E -10X 20k/(100k + 2
0 k ) = 5/3 = 1.67 (V)
There are 10 to 20 KO'c at ~1 mm). In this way, if there is a pinhole in the enameled wire 3 passing through the water in the inner tank 4a, the voltage at one input terminal of the comparator 3 will suddenly drop (from 10V to 1.67V in the above example). Therefore, by setting the voltage at the other input terminal of the comparator 13 to a predetermined level (for example, 5V), when the voltage at one input terminal becomes 5V or less, The voltage at the protruding end becomes A, and as a result, the buzzer 17 is driven via the NOT circuit 16, and it is confirmed that there is a pinhole in the part of the enameled wire 3 that is running underwater in the inner tank 4a. I understand.
なお、１対の電極６間におりるピンホールの数に対応し
て、電極６と、接地との間の抵抗が変わるから、コンパ
レータ１３の他方の入ノＪ Ｏｆ：ｆの設定電圧値を適
当に定めることによって、エナメル線３の一定長さにお
ける、検知可能なピン小−ル吊の下限を設定することが
できる。In addition, since the resistance between the electrode 6 and the ground changes depending on the number of pinholes that fall between a pair of electrodes 6, the set voltage value of the other input node JOf:f of the comparator 13 is By setting it appropriately, it is possible to set the lower limit of the detectable pin loop hanging for a certain length of the enamelled wire 3.
槽４の外側近くにエナメル線３に対づるマーキング装置
Ｍを設り、これをブリ“−１７の代りにＮ。A marking device M for the enamelled wire 3 is provided near the outside of the tank 4, and this is used as a marking device M instead of the wire 17.
丁回路１６の出力と連動さけることによって、エナメル
線の長さ方向におりるピンホール位置にマーキングする
ことかできる。By interlocking with the output of the pin circuit 16, it is possible to mark the pinhole position extending in the length direction of the enameled wire.
４８ ／ｌ内に入れる水以外の液体どし−Ｃは、塗料被
覆導線の被覆のピンホールに容易に侵入するよう４に表
面張力を持ち、ある程度の導電率を持ち、エナメル、小
ルマル等の塗ＩＩ ＋５よび導体を溶かづことがない液
体であればよい。Liquids other than water placed in 48/l have surface tension so that they can easily penetrate into pinholes in the coating of paint-coated conductors, have a certain degree of conductivity, and are suitable for enamel, small lume, etc. Any liquid that does not dissolve Coating II +5 or the conductor may be used.
例えば、塗わ１被田導線の１つである平角形状の超伝導
線を使用した超電動マグネットの特性向上には、■高い
張ノ〕で巻線して、［１−レンツ力による線の動きを防
ぐ、■超伝導線に薄い絶縁被覆を用いて、コイルの平均
電流密度を向上さける、等の対策が施されている。その
ためには、超伝導線に＋３いては、被覆の均一性が要求
され、第５図に超電動平角線の断面図で示されるＪ：う
に、 導線２０の被覆２′１に偏肉が＋３きてはならな
い。しかしながら、（Ｊ： 、、＋１つ外形の寸法測定
だけではは、第５）図のような平角線の偏肉の検知が行
なえない。For example, in order to improve the characteristics of a superelectric magnet using rectangular superconducting wire, which is one of the coated conductors, winding the wire with a Countermeasures have been taken to prevent movement, such as increasing the average current density of the coil by using a thin insulation coating on the superconducting wire. For this purpose, the superconducting wire is required to have a uniform coating, and as shown in the cross-sectional view of the superconducting rectangular wire in Fig. 5, the coating 2'1 of the conducting wire 20 has an uneven thickness of +3 Don't come. However, it is not possible to detect the uneven thickness of a rectangular wire as shown in FIG.
しかも第５図のような偏肉を持つ超電動平角線を使用す
ると、高張力巻きによって絶縁不良をおこづおそれがあ
り、マグネッｌ〜のクエンチ時（電圧上昇時）に線間ま
たはコイルの層間で放電をおこして断線するおそれがあ
る。一方、超伝Ｓ線において、著しい偏肉のある部分に
は、無数のピンボールがあることがわかった。したがっ
て、超伝導線にお（プるピンホールの状態を全長にわた
って検知することによって、その偏肉を全長にわたって
検知することができる。Moreover, if a superelectric rectangular wire with uneven thickness as shown in Figure 5 is used, there is a risk of insulation failure due to high tension winding, and when the magnet is quenched (when the voltage rises), there is a risk of damage between the wires or between the layers of the coil. There is a risk of electrical discharge and disconnection. On the other hand, in the superconductive S-ray, it was found that there are countless pinballs in areas with significant thickness deviation. Therefore, by detecting the state of the pinhole in the superconducting wire over the entire length, it is possible to detect the uneven thickness over the entire length.
［発明の効果］
以上説明したように本発明によれば、塗料被覆導線全長
にわたってピンホールの検知が効率よく行なえる装置を
提供することができる。[Effects of the Invention] As described above, according to the present invention, it is possible to provide a device that can efficiently detect pinholes over the entire length of a paint-coated conductor.
第１図はエナメル線のピンホールの従来検知法を示す概
略斜視図、第２図は本発明にかかる検知装置の槽の部分
の断面図、第３図は本発明にがかる導通検出装置の構成
図、第４図は送出ボビンの正面図、第５図は平角線の断
面図である。
４・・・水槽 ３・・・エナメル線 ６・・・電極 １
３・・・変圧器 １０・・・定電圧回路 １３・・・コ
ンパレータ １４・・・送出ボビン １５・・・電圧設
定器 １６・・・ＮＯＴ回路 １７・・・ブザー出願代
理人 弁理士 菊 池 五 部
間 山 １） 明 信
第 ｌ 図
＋３ 図
弗 、５ 図
２θFig. 1 is a schematic perspective view showing a conventional method for detecting pinholes in enamelled wire, Fig. 2 is a sectional view of the tank portion of the detection device according to the present invention, and Fig. 3 is the configuration of the continuity detection device according to the present invention. FIG. 4 is a front view of the delivery bobbin, and FIG. 5 is a sectional view taken along a flat line. 4...Aquarium 3...Enameled wire 6...Electrode 1
3... Transformer 10... Constant voltage circuit 13... Comparator 14... Sending bobbin 15... Voltage setter 16... NOT circuit 17... Buzzer application agent Patent attorney Go Kikuchi Bumayama 1) Akira Shindai l Figure + 3 Figure 2, 5 Figure 2θ
Claims (1)
′ｇ１ｇ線を巻取る巻取ボビンと、前記両ボビンの間に
設りられた導電性液体の（Ｉｌｌと、前記槽内の導電性
液体中に配された電極と、２つの入力端の各々に前記電
極おＪ：び前記塗ｙ３＋被覆導線の一端の導体部分の各
々が接続され、前記２つの入力端間の抵抗値変化を検出
舊る導通検出装置とを備えたことを特徴とする塗料被覆
導線のピンホール検知装置。A delivery bobbin, a take-up bobbin for winding the coated wire wound on the delivery bobbin, a conductive liquid (Ill) provided between the bobbins, and a conductive liquid (Ill) in the tank. The electrodes disposed in the conductive liquid and the conductor portion at one end of the coated conductor are connected to each of the two input ends, and the resistance value changes between the two input ends. A pinhole detection device for a paint-coated conductor, characterized by comprising a continuity detection device for detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12700683A JPS6020141A (en) | 1983-07-14 | 1983-07-14 | Pin-hole detecting device of paint coated conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12700683A JPS6020141A (en) | 1983-07-14 | 1983-07-14 | Pin-hole detecting device of paint coated conductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6020141A true JPS6020141A (en) | 1985-02-01 |
Family
ID=14949347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12700683A Pending JPS6020141A (en) | 1983-07-14 | 1983-07-14 | Pin-hole detecting device of paint coated conductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6020141A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5317272A (en) * | 1991-08-22 | 1994-05-31 | Joergens Klaus | Process and apparatus employing a stream of electrolytic liquid for examining the porosity of coated objects |
| CN111337539A (en) * | 2020-02-24 | 2020-06-26 | 厦门盈趣科技股份有限公司 | Novel enameled wire insulating paint layer damage detection device and detection method |
-
1983
- 1983-07-14 JP JP12700683A patent/JPS6020141A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5317272A (en) * | 1991-08-22 | 1994-05-31 | Joergens Klaus | Process and apparatus employing a stream of electrolytic liquid for examining the porosity of coated objects |
| CN111337539A (en) * | 2020-02-24 | 2020-06-26 | 厦门盈趣科技股份有限公司 | Novel enameled wire insulating paint layer damage detection device and detection method |
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