JPH0293394A - Metal detector - Google Patents
Metal detectorInfo
- Publication number
- JPH0293394A JPH0293394A JP63246447A JP24644788A JPH0293394A JP H0293394 A JPH0293394 A JP H0293394A JP 63246447 A JP63246447 A JP 63246447A JP 24644788 A JP24644788 A JP 24644788A JP H0293394 A JPH0293394 A JP H0293394A
- Authority
- JP
- Japan
- Prior art keywords
- inspected
- metal
- magnetic
- detection
- magnetic field
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 50
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 68
- 230000008859 change Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000011109 contamination Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 235000013305 food Nutrition 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 208000003251 Pruritus Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【発明の詳細な説明】
く本発明の産業上の利用分野〉
本発明は、食品等の被検査体に混入した金属を検出する
ための金属検出機に関する。DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field of the Present Invention The present invention relates to a metal detector for detecting metal mixed in an object to be inspected such as food.
〈従来技術〉
食品等に混入した小さな金属を検出するための金属検出
機は、一般に第１１図に示すように、交番磁界を発生さ
せる送信コイルＰと、この送信コイルＰに対向して、送
信コイルＰによる交番磁界の蟻力徨が等小会わりその交
番磁界によって生じる誘起電圧が等しくなるように配置
された２つの受信コイルＳ１、Ｓ２とを備えており、送
信コイルＰと受１エコイルＳ１、Ｓ２との間を、一方の
受信コイルＳ１側から他方の受信コイルＳ２方向へと、
所定速度で被検査体Ｗを搬送させるようにしている。<Prior art> As shown in FIG. 11, a metal detector for detecting small metals mixed in foods, etc. generally has a transmitting coil P that generates an alternating magnetic field, and a transmitting coil P that faces the transmitting coil P. It is equipped with two receiving coils S1 and S2 arranged so that the forces of the alternating magnetic field caused by the coil P are equal and the induced voltages generated by the alternating magnetic field are equal, and the transmitting coil P and the receiving coil S1 , S2 from one receiving coil S1 side to the other receiving coil S2 direction,
He is trying to convey the object W to be inspected at a predetermined speed.
この受信コイルＳ１、Ｓ２は、被検査体Ｗと交わる交番
磁界を受信するために被検査体Ｗの搬送路幅と同程度の
比較的大きな径のコイルが用いられている。For the receiving coils S1 and S2, coils having a relatively large diameter, which is about the same as the width of the transport path of the object W to be inspected, are used in order to receive an alternating magnetic field that intersects with the object W to be inspected.
したがって、被検査体Ｗに金属が混入している場合、そ
の金属の通過により、２つの受信コイルＳ１、Ｓ２に交
わる磁力線の数が変化し、誘起電圧Ｅ１、Ｅ２に電位差
が生じるため、この電位差信号の大きさを所定値と比較
することによって金属検出を行なうことができる。Therefore, when metal is mixed in the object W to be inspected, the number of lines of magnetic force that intersect the two receiving coils S1 and S2 changes due to the passage of the metal, and a potential difference is generated between the induced voltages E1 and E2. Metal detection can be performed by comparing the magnitude of the signal with a predetermined value.
なお、食品等のように水分を多く含む被検査体の場合は
、この被検査体に金属が混入していなくても、２つの受
信コイルＳ１、Ｓ２の誘起電圧Ｅ］、Ｅ２に電位差が生
じるため、被検査体の種類や検出する金属の種類に応じ
て、送信コイルＰの周波数（直流磁界も含む）や電位差
信号に対する比較値等を選んで金属検出を最良の感度で
行なうようにしている。In addition, in the case of an object to be inspected that contains a lot of water such as food, a potential difference will occur between the induced voltages E] and E2 of the two receiving coils S1 and S2 even if there is no metal mixed into the object. Therefore, depending on the type of object to be inspected and the type of metal to be detected, the frequency of the transmitting coil P (including DC magnetic field) and the comparison value for the potential difference signal are selected to perform metal detection with the best sensitivity. .
く本発明が解決しようとする課題〉
しかしながら、前記のように構成された従来装置では、
混入金属の存在は検知できるが、受信コイルの径が大き
くその指向性が広いため、検知感度が低く金属が被検査
体のどの部分に含まれているかを知ることができない。Problems to be Solved by the Present Invention> However, in the conventional device configured as described above,
The presence of metal contamination can be detected, but because the diameter of the receiving coil is large and its directivity is wide, detection sensitivity is low and it is not possible to know in which part of the object the metal is contained.
このため被検査体自身の影響により小さな混入金属を検
知できなかったり、その混入要因を調べてその対策を施
すのに非常に手間がかかるという問題があった。For this reason, there have been problems in that small metal contaminants cannot be detected due to the influence of the inspected object itself, and that it takes a great deal of time and effort to investigate the cause of contamination and take countermeasures.
本発明は、この課題を解決した金属検出別を提供するこ
とを目的としている。The present invention aims to provide a metal detection device that solves this problem.
く前記課題を解決するための手段〉
前記問題を解決するために本発明の第１の金属検出機は
、
被検査体の通過方向に並んだ偶数個の磁気センサを１組
として通過方向の幅方向に沿って複数重の磁気センサを
配置し、磁気センサの出力電圧の差を求める差動検出手
段を前記磁気センサ１組毎に設けている。Means for Solving the Problems> In order to solve the problems described above, a first metal detector of the present invention includes a set of even number of magnetic sensors lined up in the passing direction of the object to be inspected, and a width in the passing direction. A plurality of magnetic sensors are arranged along the direction, and a differential detection means for determining the difference in output voltage of the magnetic sensors is provided for each set of magnetic sensors.
また、第２の金属検出機は、
少なくとも通過方向の幅方向にに゛つて磁気センサを複
数個配置し、磁気センサのＵ ・信号の変化量を出力す
る検出手段を磁気センサ毎に設けている。Further, the second metal detector has a plurality of magnetic sensors arranged at least in the width direction of the passing direction, and a detection means for outputting the amount of change in the U signal of the magnetic sensor is provided for each magnetic sensor. .
〈作用〉
したがって、被検査体中の金属による磁Ｗの変化は、複
数重あるいは複数の磁気センサにより少なくとも通過方
向の幅方向に分割されて局部的に検知される。<Operation> Therefore, changes in the magnetic W caused by metal in the object to be inspected are detected locally by multiple or multiple magnetic sensors at least divided in the width direction of the passing direction.
く本発明の第１の実施例〉（第１〜５図）以下、図面に
基づいて本発明の第１の実施例を説明する。First Embodiment of the Present Invention> (FIGS. 1 to 5) A first embodiment of the present invention will be described below based on the drawings.
第１図は、第１の実施例の別構部を示す概略の側面図で
あり、１０は、被検査体を搬送するための搬送コンベア
である。FIG. 1 is a schematic side view showing a separate section of the first embodiment, and 10 is a conveyor for conveying the object to be inspected.
この搬送路中央には被検査体中の金属を検出するための
検出ヘッド１１が設けられている。A detection head 11 for detecting metal in the object to be inspected is provided at the center of this conveyance path.
検出ヘッド１１は、上方から搬送路に向って交番磁界を
発生する送信コイル１２と、この送信コイル１２に対向
し、第２図に示すように搬送路の幅方向に２列に並んだ
受信コイル１３＋〜１３ｎ、１４１〜１４ｎから構成さ
れている。The detection head 11 includes a transmitting coil 12 that generates an alternating magnetic field from above toward the conveying path, and receiving coils that oppose the transmitting coil 12 and are arranged in two rows in the width direction of the conveying path as shown in FIG. It is composed of 13+ to 13n and 141 to 14n.
送信コイル１２は、所定周波数の励磁信号（図示せず）
により、各受信コイルにほぼ等巾の磁束を鎖交させるよ
うに構成されている。The transmitting coil 12 receives an excitation signal (not shown) at a predetermined frequency.
Accordingly, each receiving coil is configured to interlink magnetic flux with approximately the same width.
なお、搬送コンベア１０の両側には被検査体の検出ヘッ
ド１１への進入を光で検知するための投光器１５と受光
器１６が設けられている。Note that a light projector 15 and a light receiver 16 are provided on both sides of the conveyor 10 to detect the entrance of the object to be inspected into the detection head 11 with light.
検出ヘッド１１の各受信コイルは、被検査体Ｗの通過幅
に比べて小径で鋭い指向性をそれぞれが有しており、搬
送方向に隣接する受信コイル同士を１１１１として第３
図に示すように差動接続され、それぞれ検出回路２ＣＢ
〜２Ｏｎに接続されている。Each of the receiving coils of the detection head 11 has a small diameter and sharp directivity compared to the passage width of the object W to be inspected.
Differentially connected as shown in the figure, each detection circuit 2CB
~2On is connected.
検出回路２０１〜２Ｏｎは同一に構成されており、増幅
器２１で増幅した差分信号を同期検波回路２２で励磁信
号により同期検波した後、被検査体の搬送速度に対応す
る周波数特性を有する低域フィルタ２３でノイズ成分を
除去して得られた検出信号のうち一方側の極性の検出信
号を整流回路２４より出力するように構成された周知の
回路である。The detection circuits 201 to 2On have the same configuration, and after the differential signal amplified by the amplifier 21 is synchronously detected by the excitation signal in the synchronous detection circuit 22, a low-pass filter having frequency characteristics corresponding to the conveyance speed of the object to be inspected is applied. This is a well-known circuit configured to output a detection signal of one polarity from the rectifier circuit 24 out of the detection signals obtained by removing noise components in step 23.
各検出回路２０１〜２０ｎからの検出信号は、判定回路
３０および波形表示装置３５に入力されている。Detection signals from each detection circuit 201 to 20n are input to a determination circuit 30 and a waveform display device 35.
判定回路３０は、各検出信号を所定の基準値と比較して
、この基準値より大きな検出信号が入力されると金属混
入を知らせるアラーム信号（図示せず）等を発生するよ
うに構成されている。The determination circuit 30 is configured to compare each detection signal with a predetermined reference value, and when a detection signal larger than this reference value is inputted, generates an alarm signal (not shown) etc. to notify metal contamination. There is.
波形表示８置３５は、被検査体が検出ヘッド１１に進入
してから′ｉ！１′Ａするまでの間の各検出信号を受け
て、被検査体中の金属の混入状態を画面表示するように
構成されており、例えば受信コイルの配列方向（Ｗｉ返
送路幅方向）をＸ軸、時間経過をＹ軸、検出信号の大き
さをＺ軸として三次元表示するようにマイクロコンピュ
ータ等でプロゲラｌ＼制御されている。The waveform display 8 and 35 indicate 'i!' after the object to be inspected enters the detection head 11. It is configured to receive each detection signal up to 1'A and display the state of metal contamination in the object to be inspected on the screen.For example, the receiving coil arrangement direction (Wi return path width direction) The Progera is controlled by a microcomputer or the like so that it is displayed three-dimensionally with the elapsed time as the Y-axis and the magnitude of the detection signal as the Z-axis.
次に、このように構成された金属検出機の動作を説明す
る。Next, the operation of the metal detector configured as described above will be explained.
搬送コンベア１０上に搬入された被検査体Ｗが投光器１
５と受光器１６の間を横切って検出ベンド１１内に進入
すると、被検査体Ｗ自身による磁界への影響で各組の受
信コイル１３１〜１３ｎ側の磁束密度が変化し、進入前
に平衡状態にあった１組毎の受信コイルの誘起電圧が、
不平衡状態となる。The object to be inspected W carried onto the conveyor 10 is exposed to the light emitter 1
5 and the light receiver 16 and enters the detection bend 11, the magnetic flux density on the side of each set of receiving coils 131 to 13n changes due to the influence of the inspected object W itself on the magnetic field, and an equilibrium state is reached before entering the detection bend 11. The induced voltage of each pair of receiving coils in
This results in an unbalanced state.
このため、検出回路２０１〜２０ｎの各増幅器２１から
この差分信号が同期検波回路２２で検波され、低域フィ
ルタ２３から整流回路２４を介して一方の極性の検出信
号がそれぞれ出力される。Therefore, this differential signal from each amplifier 21 of the detection circuits 201 to 20n is detected by the synchronous detection circuit 22, and a detection signal of one polarity is outputted from the low-pass filter 23 via the rectification circuit 24, respectively.
ここで、被検査体Ｗの内部に金属が混入していて、その
混入部分が受信コイル１３１１１４１の上方を通過した
場合、各検出回路２０１〜２Ｏｎからの検出信号Ｄ＋〜
Ｄｎは第４図に示すように、この受信コイル１３ｉ
１４ｉ とその近傍の受信コイルに対応する検出信号
Ｄｉ 、 Ｄｉ＋１ 、［）＋−１の出力のみが増大し
て、他の検出信号はほとんど変化しないで出力されるこ
とになる。Here, if metal is mixed inside the inspected object W and the mixed part passes above the receiving coil 1311141, the detection signal D+~ from each detection circuit 201~2On
Dn is the receiving coil 13i as shown in FIG.
Only the outputs of the detection signals Di, Di+1, [)+-1 corresponding to 14i and the receiving coils in the vicinity thereof increase, and the other detection signals are output with almost no change.
この検出信号Ｄ１〜Ｏｎは判定回路３０に入力され、予
め決められた基準レベル■ｒと比較されるが、検出信号
Ｄｉ （およびｌ）ｉ＋１ 、Ｄｉ−１）は口の基準
レベル■ｒより大きくなるため、判定回路３０からアラ
ーム信号等が出力される。These detection signals D1 to On are input to the determination circuit 30 and compared with a predetermined reference level ■r, but the detection signals Di (and l) i+1, Di−1) are larger than the mouth reference level ■r. Therefore, the determination circuit 30 outputs an alarm signal or the like.
一方、これらの検出信号Ｄ＋〜Ｄｎを受けた波形表示装
置３５は、この信号をプログラム処理して、たとえば第
５図に示すような三次元の画面表示を行なう。On the other hand, the waveform display device 35 that receives these detection signals D+ to Dn processes the signals with a program to display a three-dimensional screen as shown in FIG. 5, for example.
この表示では、金属の混入している場所だけが山のよう
に高く表わされるため、被検査体Ｗのどの部分にどの位
の大きさの金属が混入しているかを明確に知ることがで
きる。In this display, only the places where metal is mixed are displayed as high as mountains, so it is possible to clearly know which part of the object W to be inspected is mixed with metal and how large the size is.
なお、この波形表示装置４０を、判定回路３０で金属混
入があったと判定された場合の画面データを記・ｎする
ように構成しておけば、このデータを混入ルート等の調
査に利用することができる。If the waveform display device 40 is configured to record screen data when the determination circuit 30 determines that there is metal contamination, this data can be used to investigate contamination routes, etc. Can be done.
また、この実施例では、判定回路３ｏを波形表示装置３
５と別個に設けていたが、波形表示装置３５で検出信号
の判定を行なってもよく、表示方法もこの実施例のよう
な三次元表示だけでなく、検出信号の大きさに対応して
段階的に色付は表示するようにしてもよく、周知の表示
方法を各種用いることが可能であり、このような波形表
示回路３５を設けなくとも各検出信号の判定結果をラン
プ表示するようにしてもよい。Further, in this embodiment, the determination circuit 3o is connected to the waveform display device 3.
Although the waveform display device 35 is provided separately from the waveform display device 35, the detection signal may be judged by the waveform display device 35, and the display method is not limited to three-dimensional display as in this embodiment, but can also be displayed in stages corresponding to the magnitude of the detection signal. The display may be displayed in color, and various well-known display methods can be used, and the determination results of each detection signal can be displayed using lamps without providing such a waveform display circuit 35. Good too.
く本発明の第２の実施例〉（第６〜１０図）なお、前記
実施例では、被検査体の搬送方向に隣接する２つの受信
コイルを１組として金属検知を行なうようにしていたが
、第６図に示すように搬送コンベア１０の幅方向に一列
に並べた受信コイル１８１〜１８ｎに、それぞれ第７図
のような検出回路２５１〜２５ｎを接続して構成しても
よい。Second Embodiment of the Present Invention (FIGS. 6 to 10) In the above embodiment, metal detection was performed using two receiving coils adjacent in the transport direction of the object to be inspected as one set. , detection circuits 251 to 25n as shown in FIG. 7 may be connected to receiving coils 181 to 18n arranged in a row in the width direction of the conveyor 10 as shown in FIG. 6, respectively.
この検出回路２５１〜２５ｎは、前記実施例の検出回路
２０１〜２Ｏｎの構成ににサンプルホールド回路２６と
減算器２７を加えて構成されている。The detection circuits 251 to 25n are configured by adding a sample hold circuit 26 and a subtracter 27 to the configuration of the detection circuits 201 to 2On of the previous embodiment.
サンプルホールド回路２６は、整流回路２４の出力Ｄ１
〜Ｄｎを、コンベア１０の搬送速度に比べて非常に速い
周期でサンプリングして、その保持出力を減算器２７へ
送出するように構成され、減輝器２７は、この保持出力
と整流回路２４の出力とを減算した信号を検出信号Ｋ】
〜Ｋｎとして出力する。The sample hold circuit 26 receives the output D1 of the rectifier circuit 24.
~Dn is sampled at a very fast period compared to the conveyance speed of the conveyor 10 and the held output is sent to the subtracter 27. The signal obtained by subtracting the output is the detected signal K]
~Kn.
したがって、受信コイル１８１〜１８ｎの誘起電圧の所
定時間当たりの変化量が検出信号として各検出回路２５
１〜２５ｎから出力されることになる。Therefore, the amount of change in the induced voltage of the receiving coils 181 to 18n per predetermined time is used as a detection signal for each detection circuit 25.
It will be output from 1 to 25n.
ここで、前記同様に受信コイル１８１の上方を、被検査
体Ｗの金属混入部分が通過すると、検出回路２５１の整
流回路２４出力ＤＩは、第８図のように急激に増大する
ため、減粋器２７の出力にもこれと同時に、振幅の大き
な検出信号を出力する。Here, when the metal-containing part of the object W to be inspected passes above the receiving coil 181 as described above, the output DI of the rectifier circuit 24 of the detection circuit 251 increases rapidly as shown in FIG. At the same time, a detection signal with a large amplitude is outputted to the output of the device 27.
この検出信号を前記同様に波形表示菰＠３５に入力して
その振幅変化の激しい場所を例えば明暗等で表示させれ
ば金属混入位置を明確に知ることができる。If this detection signal is inputted to the waveform display @35 in the same manner as described above and the location where the amplitude changes sharply is displayed, for example, in brightness or darkness, the location of metal contamination can be clearly known.
なお、この実施例では、検波整流出力をサンプルホール
ド回路２６および減舜器２７に入力するようにしていた
が、送信コイルあるいは送信コイルに代わる永久磁石か
ら直流磁界が発生されている場合は、第９図のように増
幅器２１の出力を直接サンプルホールド回路２６と減痒
器２７に接続するように検出回路４０１を構成してもよ
い。In this embodiment, the detection rectification output is input to the sample and hold circuit 26 and the reducer 27, but if a DC magnetic field is generated from the transmitting coil or a permanent magnet replacing the transmitting coil, the The detection circuit 401 may be configured so that the output of the amplifier 21 is directly connected to the sample and hold circuit 26 and the pruritus reducer 27 as shown in FIG.
また、サンプルホールド回路２６の代わりに遅延回路を
用いることも可能であり、第１０図に示すように、イン
ダクタンスＬとコンデンサＣからなる遅延回路４２によ
り、増幅器２１からの交流の誘起電圧信号を位相の一致
した状態で数周切分遅らせて減輝器２７へ出力し、遅延
されていない信号との差信号を検波回路４３で検波する
ように検出回路４１１を構成するようにしてもよい。It is also possible to use a delay circuit instead of the sample and hold circuit 26, and as shown in FIG. The detection circuit 411 may be configured to delay the signal by several cycles and output it to the brightness attenuator 27 when they match, and the detection circuit 43 detects the difference signal from the undelayed signal.
この場合は、被検歪体Ｗ中の金属混入部分が受信コイル
１８１を通過するときの誘起信号の振幅および位相の変
化を検出することができる。In this case, changes in the amplitude and phase of the induced signal when the metal-containing portion of the strained body W to be tested passes through the receiving coil 181 can be detected.
く本発明の他の実施例〉
なお、前記第１、第２の実施例では、１組あるいは個々
の受信コイルを搬送路の幅方向に一列に整列した状態で
並べていたが、このコイル列を搬送方向に複数月並べて
、時間差を有する検出信号を得るようにすれば波形観α
Ｊ用のデータが増え、混入金属の検知をより明確に行な
うことができるとともに、検出中のある時間に雑音が発
生しても、雑音を含まない検出信号を用いることができ
るという利点がある。Other Embodiments of the Present Invention In the first and second embodiments, one set or individual receiving coils are arranged in a line in the width direction of the conveyance path. If multiple months are lined up in the transport direction and detection signals with time differences are obtained, the waveform view α can be improved.
This method has the advantage that the amount of data for J is increased, the metal contamination can be detected more clearly, and even if noise occurs at a certain time during detection, a detection signal that does not include noise can be used.
また、前記第２の実施例のように個々の受信コイルから
検出信号を得るようにしたものでは、受信コイルの配置
を一様（−列）にせずに不規則に配置するようにしても
よい。Furthermore, in the case where detection signals are obtained from individual receiving coils as in the second embodiment, the receiving coils may not be arranged uniformly (in negative rows) but may be arranged irregularly. .
また、前記第１、第２の実施例では、磁気センサとして
受信コイルを用いていたが、ホール素子等の他の磁気セ
ンサを用いてもよい。Further, in the first and second embodiments, a receiving coil is used as the magnetic sensor, but other magnetic sensors such as a Hall element may also be used.
く本発明の効果〉
本光明の金属検出機は、前記説明のように磁気センサを
少なくとも搬送路の幅方向に複数配置して、被検査体中
の混入金属を局部的に検出するようにしたため、指向性
の強い小型の磁気センサを用いることができ、高感度な
金属検出が行なえるとともに、各組あるいは個々の磁気
センサに対応した検出手段からの検出信号に基づいて混
入金属の位置を明確に知ることができるという効果があ
る。Effects of the Present Invention> As described above, the metal detector of the present invention has a plurality of magnetic sensors arranged at least in the width direction of the conveyance path to locally detect mixed metals in the object to be inspected. , it is possible to use a small magnetic sensor with strong directivity, which enables highly sensitive metal detection and clarifies the location of contaminated metal based on the detection signal from the detection means corresponding to each set or individual magnetic sensor. This has the effect of allowing you to know about it.
第１図は、本発明の第１の実施例の機構部を示ｔａ略側
面図、第２図は第１図の要部を示す概略平面図、第３図
は第１の実施例の検出回路を示ずブロック図である。
第４図は、第１の実施例の各検出信号を示す信号図、第
５図は、各検出信号に基づいて表示される波形図の一例
を示す図である。
第６図は、本発明の第２の実施例の概略平面図、第７図
は第２の実施例の検出回路を示すブロック図、第８図は
第２の実施例の要部の信号図である。
第９図、第１０図は、本発明の他の実施例の一部のみを
示すブロック図である。
第１１図は、金属検出の原即を説明するための概略図で
ある。
１０・・・・・・搬送コンベア、１１・・・・・・検出
ヘッド、１２・・・・・・送信コイル、１３１〜１３ｎ
、１４１〜１４ｎ、１８＋〜１８ｎ・・・・・・受信コ
イル、１５・・・・・・投光器、１６・・・・・・受光
器、２０１〜２Ｏｎ、２５１〜２５ｎ・・・・・・検出
回路、２２・・・・・・同期検波回路、２３・・・・・
・低域フィルタ、２４・・・・・・整流回路、２６・・
・・・・サンプルホールド回路、２７・・・・・・減算
器、３０・・・・・・判定回路、３５・・・・・・波形
表示装置、４２・・・・・・遅延回路。
特許出願人 アンリツ株式会社Fig. 1 is a schematic side view showing the mechanism of the first embodiment of the present invention, Fig. 2 is a schematic plan view showing the main parts of Fig. 1, and Fig. 3 is a detection diagram of the first embodiment. It is a block diagram without showing a circuit. FIG. 4 is a signal diagram showing each detection signal of the first embodiment, and FIG. 5 is a diagram showing an example of a waveform diagram displayed based on each detection signal. FIG. 6 is a schematic plan view of a second embodiment of the present invention, FIG. 7 is a block diagram showing a detection circuit of the second embodiment, and FIG. 8 is a signal diagram of main parts of the second embodiment. It is. 9 and 10 are block diagrams showing only a portion of another embodiment of the present invention. FIG. 11 is a schematic diagram for explaining the basics of metal detection. 10... Conveyor, 11... Detection head, 12... Transmission coil, 131 to 13n
, 141-14n, 18+-18n...Receiving coil, 15...Emitter, 16...Receiver, 201-2On, 251-25n...Detection Circuit, 22... Synchronous detection circuit, 23...
・Low pass filter, 24... Rectifier circuit, 26...
... Sample hold circuit, 27 ... Subtractor, 30 ... Judgment circuit, 35 ... Waveform display device, 42 ... Delay circuit. Patent applicant: Anritsu Corporation
Claims (2)
生手段と、前記磁界発生手段によつて発生した磁界を受
ける位置に配置された磁気センサとを備え、前記磁界中
を通過する被検査体中の金属によつて生じる前記磁気セ
ンサの出力信号変化に基づいて金属検知を行なう金属検
出機において、被検査体の通過方向に並んだ偶数個の磁
気センサを１組として前記通過方向の幅方向に沿つて複
数組の磁気センサを配置し、磁気センサの出力電圧の差
を求める差動検出手段を前記磁気センサ１組毎に設けた
ことを特徴とする金属検出機。(1) A magnetic field generating means for generating a magnetic field on a transport path of an object to be inspected, and a magnetic sensor disposed at a position to receive the magnetic field generated by the magnetic field generating means, and the object passing through the magnetic field. In a metal detector that detects metal based on changes in the output signal of the magnetic sensor caused by metal in the object to be inspected, an even number of magnetic sensors arranged in the passing direction of the object to be inspected are set as one set. A metal detector characterized in that a plurality of sets of magnetic sensors are arranged along the width direction, and a differential detection means for determining a difference in output voltage of the magnetic sensors is provided for each set of magnetic sensors.
手段と、前記磁界発生手段によって発生した磁界を受け
る位置に配置された複数の磁気センサとを備え、前記磁
界中を通過する被検査体中の金属によつて生じる前記磁
気センサの出力信号に基づいて金属検知を行なう金属検
出機において、少なくとも被検査体の通過方向の幅方向
に沿つて前記磁気センサを複数個配置し、磁気センサの
出力信号の変化量を出力する手段を磁気センサ毎に設け
たことを特徴とする金属検出機。(2) A magnetic field generating means for generating a magnetic field with respect to a conveyance path of the object to be inspected, and a plurality of magnetic sensors arranged at positions receiving the magnetic field generated by the magnetic field generating means, and the object passing through the magnetic field. In a metal detector that detects metal based on an output signal of the magnetic sensor generated by metal in the object to be inspected, a plurality of the magnetic sensors are arranged at least along the width direction of the object to be inspected in the passing direction, and the magnetic sensor is A metal detector characterized in that each magnetic sensor is provided with means for outputting the amount of change in the output signal of the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246447A JP2574694B2 (en) | 1988-09-30 | 1988-09-30 | Metal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246447A JP2574694B2 (en) | 1988-09-30 | 1988-09-30 | Metal detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0293394A true JPH0293394A (en) | 1990-04-04 |
| JP2574694B2 JP2574694B2 (en) | 1997-01-22 |
Family
ID=17148582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63246447A Expired - Fee Related JP2574694B2 (en) | 1988-09-30 | 1988-09-30 | Metal detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2574694B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04122883A (en) * | 1990-09-14 | 1992-04-23 | Nikka Densoku Kk | Metal detection method and apparatus |
| JPH0527695U (en) * | 1991-09-24 | 1993-04-09 | 日新電子工業株式会社 | Needle measuring machine for clothing |
| JP2009109346A (en) * | 2007-10-30 | 2009-05-21 | Yamato Scale Co Ltd | Weight screening apparatus with metal detector |
| JP2014092365A (en) * | 2012-10-31 | 2014-05-19 | Anritsu Sanki System Co Ltd | Metal detector |
| JP2014228522A (en) * | 2013-05-27 | 2014-12-08 | アンリツ産機システム株式会社 | Metal detection machine |
| CN104656149A (en) * | 2015-01-23 | 2015-05-27 | 浙江万里学院 | Metal safety detection door |
| JP2015175639A (en) * | 2014-03-13 | 2015-10-05 | アンリツ産機システム株式会社 | metal detector |
| JP2016057170A (en) * | 2014-09-10 | 2016-04-21 | 株式会社ハシマ | Operation confirmation method of detection sensor, inspection meter, and test piece |
| JP2018141683A (en) * | 2017-02-27 | 2018-09-13 | アンリツインフィビス株式会社 | Metal Detector |
| JP2018141682A (en) * | 2017-02-27 | 2018-09-13 | アンリツインフィビス株式会社 | Metal Detector |
| DE102014119464B4 (en) | 2014-09-22 | 2021-11-11 | Hyundai Motor Company | DEVICE AND METHOD FOR REDUCING FUEL DILUTION OF A DIESEL ENGINE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730971A (en) * | 1980-07-31 | 1982-02-19 | Ponii Sangyo Kk | Metal detector |
| JPS6025474A (en) * | 1983-07-22 | 1985-02-08 | Anritsu Corp | Detector of metal |
-
1988
- 1988-09-30 JP JP63246447A patent/JP2574694B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730971A (en) * | 1980-07-31 | 1982-02-19 | Ponii Sangyo Kk | Metal detector |
| JPS6025474A (en) * | 1983-07-22 | 1985-02-08 | Anritsu Corp | Detector of metal |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04122883A (en) * | 1990-09-14 | 1992-04-23 | Nikka Densoku Kk | Metal detection method and apparatus |
| JPH0527695U (en) * | 1991-09-24 | 1993-04-09 | 日新電子工業株式会社 | Needle measuring machine for clothing |
| JP2009109346A (en) * | 2007-10-30 | 2009-05-21 | Yamato Scale Co Ltd | Weight screening apparatus with metal detector |
| JP2014092365A (en) * | 2012-10-31 | 2014-05-19 | Anritsu Sanki System Co Ltd | Metal detector |
| JP2014228522A (en) * | 2013-05-27 | 2014-12-08 | アンリツ産機システム株式会社 | Metal detection machine |
| JP2015175639A (en) * | 2014-03-13 | 2015-10-05 | アンリツ産機システム株式会社 | metal detector |
| JP2016057170A (en) * | 2014-09-10 | 2016-04-21 | 株式会社ハシマ | Operation confirmation method of detection sensor, inspection meter, and test piece |
| DE102014119464B4 (en) | 2014-09-22 | 2021-11-11 | Hyundai Motor Company | DEVICE AND METHOD FOR REDUCING FUEL DILUTION OF A DIESEL ENGINE |
| CN104656149A (en) * | 2015-01-23 | 2015-05-27 | 浙江万里学院 | Metal safety detection door |
| JP2018141683A (en) * | 2017-02-27 | 2018-09-13 | アンリツインフィビス株式会社 | Metal Detector |
| JP2018141682A (en) * | 2017-02-27 | 2018-09-13 | アンリツインフィビス株式会社 | Metal Detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2574694B2 (en) | 1997-01-22 |
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