JPH046489A - Verifying and testing method for operation of search coil of metal detector - Google Patents
Verifying and testing method for operation of search coil of metal detectorInfo
- Publication number
- JPH046489A JPH046489A JP2107994A JP10799490A JPH046489A JP H046489 A JPH046489 A JP H046489A JP 2107994 A JP2107994 A JP 2107994A JP 10799490 A JP10799490 A JP 10799490A JP H046489 A JPH046489 A JP H046489A
- Authority
- JP
- Japan
- Prior art keywords
- coils
- magnetic field
- coil
- induced
- voltages
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 230000032258 transport Effects 0.000 claims description 8
- 238000012790 confirmation Methods 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000010998 test method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【発明の詳細な説明】
(1) 発明の技術分野
本発明は、金属検出機のサーチコイルか正常に動作する
状態にあるか否かを確認するための試験方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a test method for confirming whether a search coil of a metal detector is in a normal operating state.
(2)従来技術とその問題点
従来、のこ種の金属検出機か生産ラインに設置されてい
る場合、その生産ラインの生産原料又は製品等か流れる
パイプの外周にサーチコイルを設置しているのか通例で
ある。従って、従来金属検出装置の動作試験をするとき
は、生産ラインを一時停止して、生産原料又は製品等か
サーチコイルか設置されたパイプ内を流れないようにし
た上で、小金属球体をアクリル樹脂に埋め込んだテスト
ピースと呼ばれる試験用の金属球体をパイプ内に流して
チエツクしていた。しかし、この方法では試験後テスト
ピースを回収することが必要であるか、パイプはフラン
ジ接続により完全に閉鎖された状態で布設されているこ
とが通例であるため、テストピースの投入及び投入され
たテストピースを回収することは面倒である。このため
、金属検出機の検出感度の調整や日常の保守点検に問題
かあった。(2) Conventional technology and its problems Conventionally, when a saw-type metal detector is installed on a production line, a search coil is installed around the outer circumference of the pipe through which raw materials or products flow through the production line. It is customary. Therefore, when testing the operation of a conventional metal detection device, the production line must be temporarily stopped to prevent production raw materials or products from flowing through the search coil or the installed pipe, and then the small metal sphere is inserted into the acrylic Tests were carried out by pouring a test metal sphere called a test piece embedded in resin into the pipe. However, this method requires the test piece to be collected after the test, or the pipe is usually laid completely closed with a flange connection. Retrieving test pieces is troublesome. For this reason, there were problems in adjusting the detection sensitivity of the metal detector and in daily maintenance and inspection.
(3)発明の目的
本発明の目的は、サーチコイルを設置した生産ラインを
停止することなしに実施する二とがてきテストピースを
容易に回収することのできる金属検出機のサーチコイル
の動作確認試験方法を提供することにある。(3) Purpose of the Invention The purpose of the present invention is to confirm the operation of the search coil of a metal detector, which can easily collect test pieces without stopping the production line in which the search coil is installed. The objective is to provide a test method.
(4)発明の構成と作用
この目的を達成するために、本発明による金属検出機の
サーチコイルの動作確認試験方法は、非金属対象物を輸
送する輸送パイプの外周に交流磁界を発生する送信コイ
ルと該送信コイルに対して対称となる二つの受信コイル
とが配置され、該二つの受信コイルからの各交流磁界出
力の差動合成出力により前記非金属対象物内の金属体を
検知するように構成された金属検出機において、前記輸
送パイプの近傍に前記送信コイルと前記二つの受信コイ
ルのいずれかからの交流磁界の磁束に交叉するように設
けられた小通路内に試験用金属球体
より動作確認の試験を行うことを特徴とする構成を有し
ている。(4) Structure and operation of the invention In order to achieve this object, the operation confirmation test method of a search coil of a metal detector according to the present invention is a transmission method that generates an alternating magnetic field around the outer periphery of a transport pipe that transports non-metallic objects. A coil and two receiving coils that are symmetrical with respect to the transmitting coil are arranged, and a metal object within the non-metallic object is detected by a differential composite output of each alternating current magnetic field output from the two receiving coils. In the metal detector configured as shown in FIG. It has a configuration characterized by conducting tests to confirm operation.
以下図面により本発明の詳細な説明する。The present invention will be explained in detail below with reference to the drawings.
まず、本発明の対象となっている金属検出機について説
明する。第1図(a)は金属検出機の原理的構成を示す
もので、円筒形の非金属製ボビン7に1個の送信コイル
2(LO)と2個の受信コイル3 (Ll)、4 (L
2)が配置され、受信コイル3.4は差動的に接続され
ており、各々は同じ形状と寸法である。また、2個の受
信コイル3,4は送信コイル2を中央に対称となる位置
に配置されている。第1図(b)は、第1図(a)の金
属検出機の等価回路である。First, a metal detector to which the present invention is applied will be explained. FIG. 1(a) shows the basic configuration of a metal detector, in which one transmitting coil 2 (LO) and two receiving coils 3 (Ll), 4 ( L
2) are arranged and the receiving coils 3.4 are differentially connected, each having the same shape and dimensions. Further, the two receiving coils 3 and 4 are arranged at symmetrical positions with the transmitting coil 2 at the center. FIG. 1(b) is an equivalent circuit of the metal detector of FIG. 1(a).
ここて、送信コイル2に発振器1から高周波電流を供給
し、交流磁界を発生させる。送信コイル2かつくる磁界
の場て、磁力線が受信コイル3゜4に交わる磁束数は相
等しくなる。この結果、受信コイル3,4に誘起される
電圧(e 1. e 2)は相等しく両電圧は受信コ
イル3,4の差動接続により差動合成され、受信コイル
3,4の出力端a−bには誘起電圧はうち消しあって、
差動増幅器5の出力にはあられれない。即ち、出力電圧
がセロの平衡状態になる。Here, a high frequency current is supplied from the oscillator 1 to the transmitting coil 2 to generate an alternating magnetic field. In the magnetic field generated by the transmitting coil 2, the number of magnetic fluxes where the lines of magnetic force intersect with the receiving coil 3 and 4 are equal. As a result, the voltages (e 1 and e 2) induced in the receiving coils 3 and 4 are equal in phase, and both voltages are differentially combined by the differential connection of the receiving coils 3 and 4, and the output terminals a of the receiving coils 3 and 4 are The induced voltages cancel each other out at -b,
It cannot be applied to the output of the differential amplifier 5. That is, the output voltage is in a zero equilibrium state.
この状態で第1図(a)に示すように金属体6かコイル
2. 3. 4かつくる磁界の空間内を通過すると、金
属体6によって、交流磁界に変化を生じ、受信コイル3
,4に交わる磁力線数は相等しくならなくなる。これに
よりコイル3,4に誘起される電圧el、e2の値は相
異なって、elとe2差が出力信号eOとしてあられれ
る。出力信号eOは高周波差動増幅器5で増幅されて検
出信号となる。In this state, as shown in FIG. 1(a), the metal body 6 or the coil 2. 3. 4, the metal body 6 causes a change in the alternating current magnetic field, and the receiving coil 3
, 4 are no longer equal. As a result, the voltages el and e2 induced in the coils 3 and 4 have different values, and the difference between el and e2 is obtained as the output signal eO. The output signal eO is amplified by the high frequency differential amplifier 5 and becomes a detection signal.
第2図は、本発明に用いる検出コイル部の原理的構成例
を示すものであり、8は送信コイル2と受信コイル3,
4を設けたボビン7の近傍にテストピースを通過させる
小通路である。コイルボビン7の外側近傍はコイル2.
3. 4の内側と同じように送信コイル2かつくる磁
界かひろがっており、その磁界の状態は平衡している。FIG. 2 shows an example of the basic configuration of the detection coil section used in the present invention, and 8 indicates a transmitting coil 2, a receiving coil 3,
This is a small passage through which a test piece is passed near the bobbin 7 provided with the test piece. Near the outside of the coil bobbin 7 is the coil 2.
3. 4, the magnetic field generated by the transmitting coil 2 is spreading, and the state of the magnetic field is balanced.
この磁界の磁束に交叉するように金属体か通過すれば検
出動作か得られる。本発明は、第2図のようにコイルホ
ビン7の外側近傍にコイルボビン7と、例えは平行にテ
ストピース(試験用金属球体)か通過てきる小さい通路
を設けて、この通路8を動作試験に利用することにより
、従来技術の欠点を解消するものである。If a metal object passes through the magnetic flux of this magnetic field, a detection operation can be obtained. In the present invention, as shown in Fig. 2, a small passage is provided near the outside of the coil bobbin 7, for example in parallel with the coil bobbin 7, through which a test piece (metal sphere for testing) can pass, and this passage 8 is used for an operation test. This eliminates the drawbacks of the prior art.
第3図は粉体や粒体をはこぶ輸送ラインパイプ9に第2
図に点線で示す如き金属検出装置の検出コイル部を組み
込んな場合を示す図である。輸送物は検出コイル2.
3. 4を配置したパイプ9の内部を通過して運ばれる
。輸送パイプ9は直接に検出部(サーチコイル)の開口
部とフランジ接続される。金属検出装置の検出感度の確
認や日常の保守管理に動作試験が必要であるか、この試
験は決められた基準直径の金属球体9を小通路8に通過
させて検出動作をみることができる。Figure 3 shows a second line in the transport line pipe 9 that transports powder and granules.
It is a figure which shows the case where the detection coil part of the metal detection apparatus as shown by the dotted line in a figure is not incorporated. The object to be transported is the detection coil 2.
3. 4 is placed inside the pipe 9. The transport pipe 9 is directly flange-connected to the opening of the detection section (search coil). To determine whether an operation test is necessary for checking the detection sensitivity of the metal detection device or for daily maintenance, this test can be performed by passing a metal sphere 9 of a predetermined standard diameter through the small passageway 8 and observing the detection operation.
(5)発明の効果
以上詳細に説明のように、本発明により検出部のコイル
パイプの近傍にテストピースか通る大きさの通路を設け
、二の通路にテストピースを通過させて、動作試験に使
用することにより生産ラインを一時停止することなく動
作試験をすることができ、テストピースも容易に回収可
能である。(5) Effects of the Invention As explained in detail above, according to the present invention, a passage large enough for a test piece to pass through is provided near the coil pipe of the detection section, and the test piece is passed through the second passage to perform an operation test. By using it, operation tests can be performed without temporarily stopping the production line, and test pieces can be easily collected.
第1図(a)(b)は本発明か対象としている金属検出
機の原理的構成を示す構成図及び等価回路図、第2図は
本発明に用いる検出コイル部の原理的構成を示す斜視図
、第3図は本発明の詳細な説明するための検出コイル部
の斜視図である。
1・・・発振器、2・・・送信コイル、3.4・・・受
信コイル、5・・・差動増幅器、6・・・テストピース
、7・・・コイルボビン、8・・・小通路、9・・・輸
送パイプ、10・・・検出コイル部。
特許出願人 日新電子工業株式会社FIGS. 1(a) and 1(b) are block diagrams and equivalent circuit diagrams showing the basic structure of the metal detector to which the present invention is applied, and FIG. 2 is a perspective view showing the basic structure of the detection coil section used in the present invention. 3 are perspective views of the detection coil section for explaining the present invention in detail. DESCRIPTION OF SYMBOLS 1... Oscillator, 2... Transmission coil, 3.4... Receiving coil, 5... Differential amplifier, 6... Test piece, 7... Coil bobbin, 8... Small passage, 9...Transportation pipe, 10...Detection coil section. Patent applicant Nissin Electronic Industries Co., Ltd.
Claims (1)
発生する送信コイルと該送信コイルに対して対称となる
二つの受信コイルとが配置され、該二つの受信コイルか
らの各交流磁界出力の差動合成出力により前記非金属対
象物内の金属体を検知するように構成された金属検出機
において、前記輸送パイプの近傍に前記送信コイルと前
記二つの受信コイルのいずれかからの交流磁界の磁束に
交叉するように設けられた小通路内に試験用小金属球を
通過させたときに得られる検知出力により動作確認の試
験を行うことを特徴とする金属検出機のサーチコイルの
動作確認試験方法。A transmitting coil that generates an alternating current magnetic field and two receiving coils that are symmetrical to the transmitting coil are arranged around the outer periphery of a transport pipe that transports non-metallic objects, and each alternating magnetic field output from the two receiving coils is In a metal detector configured to detect a metal object in the non-metallic object using a differential combined output, an alternating magnetic field from either the transmitting coil or the two receiving coils is applied near the transport pipe. An operation confirmation test of a search coil for a metal detector, characterized in that the operation confirmation test is performed based on the detection output obtained when a small metal ball for testing is passed through a small passage provided to intersect the magnetic flux. Method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2107994A JPH046489A (en) | 1990-04-24 | 1990-04-24 | Verifying and testing method for operation of search coil of metal detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2107994A JPH046489A (en) | 1990-04-24 | 1990-04-24 | Verifying and testing method for operation of search coil of metal detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH046489A true JPH046489A (en) | 1992-01-10 |
Family
ID=14473290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2107994A Pending JPH046489A (en) | 1990-04-24 | 1990-04-24 | Verifying and testing method for operation of search coil of metal detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH046489A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1158313A2 (en) * | 2000-05-26 | 2001-11-28 | ISHIDA CO., Ltd. | Article handling system |
JP2003014866A (en) * | 2001-07-03 | 2003-01-15 | Ishida Co Ltd | Metal detector and detecting system |
JP2005049300A (en) * | 2003-07-31 | 2005-02-24 | Yamato Scale Co Ltd | Metal detector |
JP2017151078A (en) * | 2015-12-17 | 2017-08-31 | メトラー−トレド・セーフライン・リミテッド | Metal detection apparatus, test device, and method for optimizing metal detection apparatus |
WO2017156226A1 (en) * | 2016-03-10 | 2017-09-14 | Kellogg Company | Food processing system and a method including testing a foreign object sensor |
KR102204171B1 (en) * | 2020-04-14 | 2021-01-19 | 대보정보통신 주식회사 | Multi-measurement device using search coil type magnetic sensors |
-
1990
- 1990-04-24 JP JP2107994A patent/JPH046489A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1158313A2 (en) * | 2000-05-26 | 2001-11-28 | ISHIDA CO., Ltd. | Article handling system |
EP1158313A3 (en) * | 2000-05-26 | 2002-10-23 | ISHIDA CO., Ltd. | Article handling system |
JP2003014866A (en) * | 2001-07-03 | 2003-01-15 | Ishida Co Ltd | Metal detector and detecting system |
JP4570820B2 (en) * | 2001-07-03 | 2010-10-27 | 株式会社イシダ | Metal detector |
JP2005049300A (en) * | 2003-07-31 | 2005-02-24 | Yamato Scale Co Ltd | Metal detector |
JP2008233099A (en) * | 2003-07-31 | 2008-10-02 | Yamato Scale Co Ltd | Metal detection device |
JP2017151078A (en) * | 2015-12-17 | 2017-08-31 | メトラー−トレド・セーフライン・リミテッド | Metal detection apparatus, test device, and method for optimizing metal detection apparatus |
WO2017156226A1 (en) * | 2016-03-10 | 2017-09-14 | Kellogg Company | Food processing system and a method including testing a foreign object sensor |
US10906682B2 (en) | 2016-03-10 | 2021-02-02 | Kellogg Company | Food processing system, apparatus for testing a foreign object sensor and a method for operating the food processing system |
AU2017229762B2 (en) * | 2016-03-10 | 2021-12-02 | Kellanova | Food processing system and a method including testing a foreign object sensor |
AU2017229762C1 (en) * | 2016-03-10 | 2022-03-24 | Kellanova | Food processing system and a method including testing a foreign object sensor |
KR102204171B1 (en) * | 2020-04-14 | 2021-01-19 | 대보정보통신 주식회사 | Multi-measurement device using search coil type magnetic sensors |
WO2021210831A1 (en) * | 2020-04-14 | 2021-10-21 | 최재훈 | Multi-measurement device using search coil type sensor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4107605A (en) | Eddy current flaw detector utilizing plural sets of four planar coils, with the plural sets disposed in a common bridge | |
US5414353A (en) | Method and device for nondestructively inspecting elongated objects for structural defects using longitudinally arranged magnet means and sensor means disposed immediately downstream therefrom | |
US5315243A (en) | Detection and discrimination between ferromagnetic and non-ferromagnetic conductive particles in a fluid | |
AU595748B2 (en) | Magnetic flux leakage probe with radially offset coils for use in nondestructives testing of pipes and tubes | |
US4495465A (en) | Method and apparatus for non-destructive testing of magnetically permeable bodies using a first flux to saturate the body and a second flux opposing the first flux to produce a measurable flux | |
US7038445B2 (en) | Method, system and apparatus for ferromagnetic wall monitoring | |
US5705924A (en) | Hall effect sensor for detecting an induced image magnet in a smooth material | |
WO2000008458A1 (en) | Eddy-current flaw detector probe | |
US5336998A (en) | Sensor for detecting faults in a magnetized ferrous object using hall effect elements | |
KR101720831B1 (en) | Through-coil arrangement, test apparatus with through-coil arrangement and testing method | |
JPH09145810A (en) | Superconducting quantum interference device fluxmeter and non-destructive inspection device | |
US5049817A (en) | Eddy current probe, incorporating multi-bracelets of different pancake coil diameters, for detecting internal defects in ferromagnetic tubes | |
JP2017015451A (en) | Metal detection sensor and method of detecting metal using the same | |
JPS6132619B2 (en) | ||
JPH046489A (en) | Verifying and testing method for operation of search coil of metal detector | |
US2964699A (en) | Probe device for flaw detection | |
Cecco et al. | Eddy current testing; v 1, manual on Eddy current method | |
JPH10197493A (en) | Eddy-current flow detecting probe | |
US4659990A (en) | Eddy current test system including a member of high permeability material effective to concentrate flux in a very small region of a part | |
JP6097906B2 (en) | Inspection device for minute magnetic metal foreign matter | |
RU2634366C2 (en) | Method for magnetic flaw detection and device for its implementation | |
JPH0933489A (en) | Moving exciting coil type eddy current flaw detector employing squid flux meter | |
US3075145A (en) | Magnetic detection of flaws using mutually coupled coils | |
EP0093566A2 (en) | Method and apparatus for non-destructive testing of magnetical permeable bodies | |
JPH0815229A (en) | High resolution eddy current flaw detector |