JPH08233946A - Detecting coil of detector of iron piece - Google Patents
Detecting coil of detector of iron pieceInfo
- Publication number
- JPH08233946A JPH08233946A JP6206995A JP6206995A JPH08233946A JP H08233946 A JPH08233946 A JP H08233946A JP 6206995 A JP6206995 A JP 6206995A JP 6206995 A JP6206995 A JP 6206995A JP H08233946 A JPH08233946 A JP H08233946A
- Authority
- JP
- Japan
- Prior art keywords
- coils
- coil
- iron piece
- iron
- detection coil
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 47
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁性物の探知、例えば
縫製品等に残留する縫い針の検出や、銅スクラップ中に
混入した鉄片の検出、その他、一般に鉄片が混入すると
都合の悪い製品および生産材料の品質管理等に用いられ
ている鉄片探知機の探知コイルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detection of magnetic substances, for example, detection of sewing needles remaining in sewn products and the like, detection of iron pieces mixed in copper scrap, and other products which are generally inconvenient when iron pieces are mixed. The present invention also relates to a detection coil of an iron piece detector used for quality control of production materials.
【０００２】[0002]
【従来の技術】従来の鉄片探知機は、図１に示すよう
に、永久磁石Ｍに対向して受信コイルＣを配置し、この
受信コイルを探知コイルとして増幅器Ｄに接続したもの
で、鉄片Ｔが磁石ＭとコイルＣの間を通過すると、探知
コイルを貫通する磁束が変化するため、探知コイルの両
端に電圧を誘起するので、この電圧を増幅器で増幅して
鉄片の探知信号を得るものであった。2. Description of the Related Art In a conventional iron piece detector, as shown in FIG. 1, a receiving coil C is arranged facing a permanent magnet M, and this receiving coil is connected to an amplifier D as a detecting coil. When the magnet passes between the magnet M and the coil C, the magnetic flux penetrating the detection coil changes, so a voltage is induced at both ends of the detection coil. Therefore, this voltage is amplified by an amplifier to obtain a detection signal of the iron piece. there were.
【０００３】[0003]
【発明が解決しようとする課題】従来の探知機では、増
幅度を上げると、探知コイルに混入する外来の電気雑音
による誘起電圧も増幅されるため、誤動作を生じるおそ
れがあり、小さい鉄片を検出するのが困難であるという
欠点があった。In the conventional detector, when the amplification degree is increased, the induced voltage due to the external electric noise mixed in the detection coil is also amplified, which may cause a malfunction, so that a small iron piece is detected. It had the drawback of being difficult to do.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、本発明は次のような構成とした。すなわち、本発明
にかかる鉄片探知機の探知コイルは、永久磁石に対向し
て探知コイルを配置した鉄片探知機における前記探知コ
イルであって、外形、寸法、巻き数の等しい２個の受信
コイルを、その極性が互いに反対となるように直列に接
続して構成したことを特徴としている。In order to achieve the above object, the present invention has the following constitution. That is, the detection coil of the iron piece detector according to the present invention is the detection coil in the iron piece detector in which the detection coil is arranged so as to face the permanent magnet, and includes two receiving coils having the same outer shape, size, and number of turns. , And are connected in series so that their polarities are opposite to each other.
【０００５】[0005]
【作用】図２において、磁石５と受信コイル６との間を
鉄片の混入した被検体Ｔが通過すると、探知コイルを貫
通する磁束が変化するため、探知コイルのコイル線の両
端に探知電圧が誘起される。探知コイルは、互いに極性
が反対である２個のコイルを直列に接続したものである
から、外来の電気雑音により誘起される雑音電圧を相殺
することができる。このため、雑音による悪影響を受け
ずに探知信号電圧を増幅することが可能で、従来の鉄片
探知機では探知が困難であるような小さい鉄片まで探知
することができる。In FIG. 2, when the subject T mixed with iron pieces passes between the magnet 5 and the receiving coil 6, the magnetic flux penetrating the detection coil changes, so that the detection voltage is applied across the coil wire of the detection coil. Induced. Since the detection coil is formed by connecting two coils whose polarities are opposite to each other in series, it is possible to cancel the noise voltage induced by external electric noise. Therefore, it is possible to amplify the detection signal voltage without being adversely affected by noise, and it is possible to detect even a small iron piece that is difficult to detect with the conventional iron piece detector.
【０００６】[0006]
【実施例】以下、図面に表された本発明の実施例につい
て具体的に説明する。図３は本発明の１実施例を示す図
で、鉄片探知機１は、搬送装置２のコンベア・ベルト３
の中間部に検出部４を設けている。検出部４の内部に
は、ベルト・コンベアを挟んで永久磁石と探知コイルが
それぞれ対向して設けられている。なお、８は鉄片が検
出されたことを報知または表示するための装置である。Embodiments of the present invention shown in the drawings will be specifically described below. FIG. 3 is a view showing an embodiment of the present invention, in which the iron piece detector 1 is a conveyor belt 3 of a conveying device 2.
The detection unit 4 is provided in the middle of Inside the detection unit 4, a permanent magnet and a detection coil are provided so as to face each other with the belt conveyor interposed therebetween. Reference numeral 8 is a device for informing or displaying that the iron piece has been detected.
【０００７】図４は、図２に示した探知コイル６と永久
磁石５の配置を示す側面図である。探知コイル６は、受
信コイル６ａと受信コイル６ｂを間隔ｄをおいて配置し
たもので、これらのコイルは、互いに極性が反対となる
ように直列に接続されている。なお、受信コイル６ａ，
６ｂは、図に示すように、磁石５の上方ｈの位置に、磁
極方向の中心線ＣＬを挟んで対称的に配置されている。
また、上記受信コイルの間隔ｄおよび磁石とコイルとの
間隔ｈは、使用条件等に応じて適当に選べばよいが、通
常は数十ミリメ−トルで、ｈが小さい程、一般に小さい
鉄片の探知が可能である。なお、探知コイルは、図示例
のように２個のコイルで構成するのが一般的であるが、
特に必要な場合は、このような受信コイルの対を複数組
設けておいてもよい。FIG. 4 is a side view showing the arrangement of the detection coil 6 and the permanent magnet 5 shown in FIG. The detection coil 6 is formed by arranging the receiving coil 6a and the receiving coil 6b at a distance d, and these coils are connected in series so that their polarities are opposite to each other. The receiving coil 6a,
As shown in the drawing, 6b are symmetrically arranged at a position h above the magnet 5 with a center line CL in the magnetic pole direction sandwiched therebetween.
The distance d between the receiving coils and the distance h between the magnet and the coil may be appropriately selected according to the usage conditions and the like. Normally, the distance d is several tens of millimeters. Is possible. The detection coil is generally composed of two coils as shown in the figure,
If necessary, a plurality of such pairs of receiving coils may be provided.
【０００８】図３の鉄片探知装置１の使用に際しては、
入り口側Ｅからコンベア・ベルト３で被検体を検出部４
に送り込む。被検体Ｔは、コンベア・ベルトの中間部に
設けられている検出部４の内部の磁石５と探知コイル６
の間を通過するが、このとき、被検体中に鉄片が混入し
ていれば、探知コイル６を貫通する磁束が変化し、コイ
ル線の両端に電圧が誘起される。この電圧は増幅器９で
増幅され、鉄片探知信号として例えば探知表示装置８等
を働かせることができる。In using the iron piece detection apparatus 1 of FIG. 3,
From the entrance side E, the conveyor belt 3 is used to detect the subject 4
Send to. The subject T is a magnet 5 and a detection coil 6 inside the detection unit 4 provided in the middle of the conveyor belt.
However, if iron pieces are mixed in the subject at this time, the magnetic flux penetrating the detection coil 6 changes, and a voltage is induced at both ends of the coil wire. This voltage is amplified by the amplifier 9 so that the detection display device 8 or the like can be operated as an iron piece detection signal.
【０００９】図２の探知コイルは、極性を互いに反対と
した２個の受信コイルが直列に接続されているので、コ
イルに誘起される外来の雑音電圧は２個のコイルで相殺
されることになる。この場合、移動する鉄片に対して
は、探知コイル６を構成する個々の受信コイル６ａ，６
ｂに個別に誘起電圧を発生するから、その電圧の大きさ
は従来の１個のコイルを用いた場合と殆ど変わらない。
したがって、信号と雑音との比（Ｓ／Ｎ比）が大となる
から、増幅度を上げても外来の電気雑音による誤動作が
少なく、従来の探知機よりもさらに小さい鉄片を探知す
ることが可能となるのである。In the detection coil of FIG. 2, since two receiving coils having polarities opposite to each other are connected in series, the external noise voltage induced in the coils is canceled by the two coils. Become. In this case, for the moving iron piece, the individual receiving coils 6a, 6 constituting the detection coil 6 are
Since the induced voltage is individually generated in b, the magnitude of the voltage is almost the same as that when one conventional coil is used.
Therefore, since the signal-to-noise ratio (S / N ratio) is large, even if the amplification degree is increased, malfunctions due to external electrical noise are small, and it is possible to detect an iron piece that is even smaller than conventional detectors. It becomes.
【００１０】なお、検出部の機械的振動により、探知コ
イル６を構成する２個のコイル６ａ，６ｂが振動し、貫
通する磁束が変化しても、それぞれの受信コイルに誘起
される電圧の大きさは同じで、互いに反対方向であるか
ら、その変化が相殺されて小さくなり、従来の探知機の
検出部よりも振動による影響を受けにくいという利点も
ある。Even if the two coils 6a and 6b constituting the detection coil 6 vibrate due to the mechanical vibration of the detection section and the magnetic flux penetrating therethrough changes, the magnitude of the voltage induced in each receiving coil is large. Since they are the same, and the directions are opposite to each other, the changes are offset and reduced, and there is an advantage that they are less affected by vibration than the detection unit of the conventional detector.
【００１１】この探知機は磁性金属である鉄片の探知機
としているから、非磁性金属に対する感度は低い方がよ
いのであるが、実際には非磁性金属に２次電流が流れる
ため、ある程度装置に感じることになる。しかし、探知
コイルが２個の受信コイルで構成されている場合には、
形状の大きい非磁性金属であると２個の受信コイルにま
たがるので、前述の相殺作用により、従来の探知機に較
べて感度が幾分落ちるという利点もある。具体的には、
例えば直径１ｍｍの鉄球と１０円銅貨とが同じ程度の感
度となる。Since this detector is an iron piece detector which is a magnetic metal, it is better that the sensitivity to non-magnetic metal is low. You will feel it. However, if the detection coil consists of two receiving coils,
Since a non-magnetic metal having a large shape straddles two receiving coils, there is also an advantage that the sensitivity is somewhat lowered as compared with the conventional detector due to the above-mentioned canceling action. In particular,
For example, an iron ball having a diameter of 1 mm and a 10-yen copper coin have the same sensitivity.
【００１２】また、図５に示すように、２個の受信コイ
ル６ａ，６ｂに誘起する外来の電気雑音電圧を、差動増
幅器７に入力して、相殺した出力を得るような構成とす
ることもできる。Further, as shown in FIG. 5, the external electric noise voltage induced in the two receiving coils 6a and 6b is input to the differential amplifier 7 to obtain a canceled output. You can also
【００１３】[0013]
【発明の効果】以上に説明した如く、本発明にかかる鉄
片探知機は、磁石に対向させて極性が反対の受信コイル
を複数個直列に接続したものであるから、外来の電気雑
音の影響を受けることが少なく、すなわちＳ／Ｎ比が大
きいから、小さな鉄片まで探知することが可能となっ
た。そのた、前述の機械的振動の影響を受けにくいと
か、形状の大きい非磁性金属に対する感度を幾分低くす
ることができる等の効果もある。As described above, since the iron piece detector according to the present invention has a plurality of receiving coils, which are opposed to the magnet and have opposite polarities, connected in series, the influence of external electric noise is eliminated. Since it is rarely received, that is, the S / N ratio is large, it is possible to detect even a small iron piece. In addition, there are effects such as being less susceptible to the above-mentioned mechanical vibration and being able to somewhat lower the sensitivity to a non-magnetic metal having a large shape.
【図１】従来の鉄片探知機の検出部の説明図である。FIG. 1 is an explanatory diagram of a detection unit of a conventional iron piece finder.
【図２】本発明による探知機の検出部の構造を示す概要
図である。FIG. 2 is a schematic diagram showing a structure of a detection unit of the detector according to the present invention.
【図３】本発明の１実施例としての鉄片探知機の外観図
である。FIG. 3 is an external view of an iron piece finder as an embodiment of the present invention.
【図４】２個の受信コイルと磁石の配置を示す検出部の
側面図である。FIG. 4 is a side view of a detection unit showing an arrangement of two receiving coils and a magnet.
【図５】差動増幅器を用いた場合の探知部の構成図であ
る。FIG. 5 is a configuration diagram of a detection unit when a differential amplifier is used.
Ｃ 探知コイル Ｍ 永久磁石 Ｔ 被検体 １ 鉄片探知表示装置 ２ 搬送装置 ３ コンベア・ベルト ４ 検出部 ５ 永久磁石 ６ 探知コイル ７ 差動増幅器 ８ 表示装置 ９ 増幅器 C detection coil M permanent magnet T subject 1 iron piece detection display device 2 carrier device 3 conveyor belt 4 detection unit 5 permanent magnet 6 detection coil 7 differential amplifier 8 display device 9 amplifier
Claims (3)
鉄片探知機における前記探知コイルであって、外形、寸
法、巻き数の等しい２個の受信コイルを、その極性が互
いに反対となるように直列に接続して構成したことを特
徴とする鉄片探知機の探知コイル。1. A detection coil in an iron piece detector in which a detection coil is arranged so as to face a permanent magnet, wherein two reception coils having the same outer shape, size, and number of turns have opposite polarities. A detection coil for an iron piece detector, which is configured by being connected in series to the.
に記載の探知コイル。2. An iron core is placed in each of the two receiving coils.
The detection coil described in.
音電圧を差動増幅器により相殺するようにした請求項１
または２に記載の探知コイル。3. A differential amplifier cancels an external electrical noise voltage induced in two receiving coils.
Or the detection coil according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6206995A JPH08233946A (en) | 1995-02-23 | 1995-02-23 | Detecting coil of detector of iron piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6206995A JPH08233946A (en) | 1995-02-23 | 1995-02-23 | Detecting coil of detector of iron piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08233946A true JPH08233946A (en) | 1996-09-13 |
Family
ID=13189443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6206995A Pending JPH08233946A (en) | 1995-02-23 | 1995-02-23 | Detecting coil of detector of iron piece |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08233946A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014224811A (en) * | 2013-04-23 | 2014-12-04 | 国立大学法人豊橋技術科学大学 | Apparatus for detecting magnetic metal foreign matter |
| JP2015175639A (en) * | 2014-03-13 | 2015-10-05 | アンリツ産機システム株式会社 | metal detector |
-
1995
- 1995-02-23 JP JP6206995A patent/JPH08233946A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014224811A (en) * | 2013-04-23 | 2014-12-04 | 国立大学法人豊橋技術科学大学 | Apparatus for detecting magnetic metal foreign matter |
| JP2015175639A (en) * | 2014-03-13 | 2015-10-05 | アンリツ産機システム株式会社 | metal detector |
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