JPH0721539B2 - Metal detection and removal method - Google Patents
Metal detection and removal methodInfo
- Publication number
- JPH0721539B2 JPH0721539B2 JP61206853A JP20685386A JPH0721539B2 JP H0721539 B2 JPH0721539 B2 JP H0721539B2 JP 61206853 A JP61206853 A JP 61206853A JP 20685386 A JP20685386 A JP 20685386A JP H0721539 B2 JPH0721539 B2 JP H0721539B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- detection area
- detection
- subject
- analyte
- 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.)
- Expired - Fee Related
Links
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- Geophysics And Detection Of Objects (AREA)
Description
【発明の詳細な説明】 （イ） 産業上の利用分野 この発明は食品、化学製品、ゴム、プラスチツク材料等
に混入している異物金属の検出除去方法に関するもので
ある。TECHNICAL FIELD The present invention relates to a method for detecting and removing foreign metal contained in foods, chemical products, rubber, plastic materials and the like.
（ロ） 従来の技術 金属検出器の検出部は発信コイル７と受信コイル５およ
び被検体の通路である検出域６とで構成されている発振
コイルから発生する電磁波を検出域に送り、被検体に当
てた後受信コイルで受信することによつて、被検体の電
磁波に対する影響を測定し、金属異物を検出するもので
ある。(B) Prior art The detection part of the metal detector sends the electromagnetic wave generated from the oscillation coil composed of the transmission coil 7, the reception coil 5 and the detection area 6 which is the passage of the object to the detection area, By receiving by the receiving coil after being applied to the object, the influence of the subject on the electromagnetic wave is measured, and the metallic foreign matter is detected.
被検体が磁性体の場合には、電磁波が収束されて、受信
コイルの誘起電力は高くなり、被検体が非磁性導電体の
場合には電磁遮蔽効果によつて受信コイルの誘起電力は
弱くなり、金属異物の検出が行われるのである。然しな
がら被検体のなかには、肉製品、漬物のように、それ自
体が導電性を有するもの、あるいはアスベスト短繊維の
ように磁性を有する充填材を含有するプラスチツク材料
などがある。例えばアスベスト10％を含有しているフエ
ノール樹脂成形材料が被検体の場合には、材料に混入し
ている0.5mmφの球体の金属異物を検出するには、検出
域を通過する材料の量を減少して3Kg/minとしなければ
ならない。成可く小さい金属異物を検出しようとすれば
する程、検出域を通過する材料の量を減少して、材料中
のアスベストの磁性の影響を小さくしないと小さい金属
の検出ができない。そうすると材料の処理量は大巾に減
少する。例えば上記材料の処理量を15Kg/minとすると検
出部は材料中のアスベストの磁性が邪魔をして0.5mmφ
の金属球を検出することができない。検出部の感度を下
げて材料に感じなくすると3mmφ以上の金属異物しか検
出できないという欠点があつた。When the object is a magnetic material, electromagnetic waves are converged and the induced power of the receiving coil becomes high.When the object is a non-magnetic conductor, the electromagnetic shielding effect weakens the induced power of the receiving coil. The detection of metallic foreign matter is performed. However, examples of the object to be examined include meat products, pickles, and the like, which are electrically conductive, or plastic materials, such as asbestos short fibers, containing a magnetic filler. For example, if the subject is a phenolic resin molding material containing 10% asbestos, decrease the amount of material that passes through the detection area to detect the 0.5 mmφ spherical foreign metal mixed in the material. And 3 Kg / min. The smaller the amount of material that can pass through the detection area is reduced to detect the smaller metallic foreign matter, the smaller the effect of the magnetism of asbestos in the material is. The material throughput is then significantly reduced. For example, if the processing amount of the above material is set to 15 Kg / min, the magnetic field of asbestos in the material interferes with the detection unit, which is 0.5 mmφ.
Cannot detect the metal sphere. However, if the sensitivity of the detection unit is lowered and the material is not felt, only metal foreign matter of 3 mmφ or more can be detected.
（ハ） 発明が解決しようとする問題点 この発明は磁性体または導電体が均一に混入されている
被検体、または被検体自体が磁性体または導電体である
被検体中の金属異物を検出する方法に関するもので、検
出域を通過する被検体の量を増加しても小さい金属異物
の検出、除去を可能にすることを目的としている。(C) Problems to be Solved by the Invention The present invention detects a foreign substance in a subject in which a magnetic substance or a conductor is uniformly mixed, or a subject in which the subject itself is a magnetic substance or a conductor. The present invention relates to a method, and an object thereof is to enable detection and removal of small metallic foreign matters even if the amount of the analyte passing through the detection area is increased.
（ニ） 問題点を解決するための手段 従来の金属検出器で、磁性体または導電体を均一に含有
する被検体、または被検体自体が磁性体または導電体で
ある被検体中の金属異物を検出する場合に、検出部の検
出域を通過する被検体量が増加すると小さい金属異物を
検出できなかつた。その原因を検討した結果、検出域を
通過する被検体量が変動すると、被検体自体が検出部に
感ずるため、受信コイルの誘起電力の変動が大きくな
り、小さい金属異物による受信コイルの誘起電力の変化
がそれに埋没されて検出できないことが分かつた。そこ
で本発明者はこの発明の問題点を次のようにして解決し
た。即ち金属検出器の検出域に被検体が規定量通過でき
るように流量規制通路を設け、検出域入口側に被検体欠
如検出器をおき、その信号にもとづいて、被検体の流れ
を制禦して、検出域に定量の被検体が存在する状態で被
検体に混入している金属異物の検出を行い、金属検出器
の信号によつて金属異物除去装置を作動させて、多量の
被検体に混入されている小さい金属異物の除去を効果的
に行うことができた。(D) Means for solving the problem In the conventional metal detector, the metal foreign matter in the subject that uniformly contains the magnetic substance or the conductor, or the subject itself in which the subject itself is the magnetic substance or the conductor is detected. In the case of detection, if the amount of the analyte passing through the detection area of the detection unit increases, it is impossible to detect the small metallic foreign matter. As a result of investigating the cause, when the amount of the subject passing through the detection area changes, the subject itself feels in the detection part, so that the variation of the induced power of the receiving coil becomes large and the induced power of the receiving coil due to a small foreign metal is It turns out that the change is buried in it and undetectable. Therefore, the present inventor has solved the problems of the present invention as follows. That is, a flow rate regulation passage is provided in the detection area of the metal detector so that a specified amount of the object can pass through, and an object lacking detector is placed on the inlet side of the detection area, and the flow of the object is controlled based on the signal. Then, the metallic foreign matter mixed in the specimen is detected in the state where a fixed amount of the specimen exists in the detection area, and the metal foreign matter removing device is operated by the signal of the metal detector, and a large amount of the specimen is detected. It was possible to effectively remove the small metallic foreign matter mixed in.
第１図によつてこの発明の検出除去方法を説明する。被
検体の通過する導管４に金属検出器の検出域６を設け
る。被検体の通過量はこの導管の断面積によつて規制さ
れる。しかも検出域の導管に被検体を常に充満させるこ
とによつて、検出域の被検体は定量に保たれる。導管４
の上部入口側に被検体欠如検出器３を設け、導管の上部
には被検体を貯えるホツパー１を置く。導管の下方に
は、排出コンベア８が設置してあり移送方向を前後へ自
在に切換できる。排出コンベアは検出部が異物を検出し
ない場合には被検体を良品として前方９へ移送する。検
出部が金属異物を検知したときは排出コンベアは一定時
間、後方10へ被検体を移送して不良品としてとり除くこ
とができる。また、排出コンベアは被検体欠如検出器に
よつて制禦され、欠如検出器が導管内の被検体が欠如し
たことを検知すると、その信号によつて排出コンベア
は、被検体が導管内に充満するまで停止する機構になつ
ている。つまり欠如検出器の信号でコンベアを制禦し
て、導管内に常に被検体を充満した状態、すなわち、検
出域に定量の被検体が存在する状態で金属異物を検出す
ることによつて、被検体量の変動による影響を取除くこ
とができた。アスベスト10％を含有するフエノール樹脂
成形材料中の金属を検出する場合には従来の方法では検
出域における材料通路を小さくして材料の通過量を3Kg/
min以下にしないと0.5mmφの球体の金属異物を検出でき
なかつた。本発明の方法によると検出域の材料通路を大
きくして材料の処理量を15Kg/minに上げても0.5mmφの
金属球を検出することができた。被検体欠如装置として
は市販の各種レベル計を利用することができる。例えば
光透過式、パドル回転式、静電容量式、超音波式などが
ある。The detection and removal method of the present invention will be described with reference to FIG. A detection area 6 of a metal detector is provided in the conduit 4 through which the subject passes. The passing amount of the subject is regulated by the cross-sectional area of this conduit. Moreover, by constantly filling the conduit in the detection area with the analyte, the analyte in the detection area is kept quantitative. Conduit 4
An object lacking detector 3 is provided on the inlet side of the upper part of, and a hopper 1 for accommodating the object is placed on the upper part of the conduit. A discharge conveyor 8 is installed below the conduit so that the transfer direction can be freely switched back and forth. When the detector does not detect a foreign substance, the discharge conveyor transfers the subject to the front 9 as a good product. When the detection unit detects a foreign metal, the discharge conveyor can transfer the object to the rear 10 for a certain period of time and remove it as a defective product. In addition, the discharge conveyor is controlled by the analyte lack detector, and when the lack detector detects that the analyte in the conduit is missing, the discharge conveyor notifies the discharge conveyor that the analyte is full in the conduit. It has a mechanism to stop until. In other words, by controlling the conveyor with the signal of the lack detector, the condition that the subject is constantly filled in the conduit, that is, the condition where a fixed amount of the subject exists in the detection area, We were able to eliminate the effect of fluctuations in the sample volume. When detecting metal in a phenolic resin molding material containing 10% asbestos, the conventional method is to reduce the material passage in the detection area so that the amount of material passing is 3 Kg /
If it is not less than min, it is not possible to detect the metallic foreign matter in the 0.5 mmφ spherical body. According to the method of the present invention, even if the material passage in the detection area is enlarged and the throughput of the material is increased to 15 kg / min, a metal ball of 0.5 mmφ can be detected. Various commercially available level meters can be used as the object lacking device. For example, there are a light transmission type, a paddle rotation type, a capacitance type, and an ultrasonic type.
第２図は第１図の装置において、被検体排出装置とし
て、回転方向を変えることのできるスクリユー12を利用
したものである。スクリユーの回転速度が被検体欠如装
置３の信号によつて制禦され、材料の送り速度をコント
ロールして検出域６に常に被検体が充満した状態で被検
体の検出が行われる。またスクリユーの回転方向は金属
検出器の信号によつて制禦され、金属が検知されない間
はスクリユーによつて材料は良品として11の方向に取り
出され、検出部が金属を検知したときは一定時間スクリ
ユーが逆回転して、金属混入材は13の方向に取り出し除
去される。FIG. 2 shows the device of FIG. 1 in which a screw 12 whose rotation direction can be changed is used as the object discharging device. The rotation speed of the screw is controlled by the signal of the object lacking device 3, and the material feeding speed is controlled to detect the object while the detection area 6 is always filled with the object. In addition, the rotation direction of the screw is controlled by the signal from the metal detector, and while the metal is not detected, the material is taken out in 11 directions by the screw as a good product, and when the metal is detected by the detector, it remains for a certain period of time. The screw rotates in the reverse direction, and the metal-containing material is taken out and removed in the direction of 13.
第３図は検出域における被検体を定量に保持するための
別の方法を示したものである。導管４の下端15をしぼ
り、シヤツター14を設けて、欠如検出器３の信号でシヤ
ツターを制禦し、検出域の導管に被検体を充満させる機
構にしてある。その下に切換シユートを設置し、検出部
が金属を検知しないときは被検体は17に落下し、金属を
検知したときは切換シユートを一定時間18の方向に傾斜
させて、金属異物の混入している被検体を除去するので
ある。FIG. 3 shows another method for quantitatively holding the analyte in the detection area. The lower end 15 of the conduit 4 is squeezed and a shutter 14 is provided so that the shutter is controlled by the signal of the lack detector 3 and the conduit in the detection area is filled with the subject. A switching shut is installed below it.When the detection part does not detect metal, the subject falls to 17, and when it detects metal, the switching shut is tilted in the direction of 18 for a certain period of time to prevent the inclusion of foreign metal. The subject being removed is removed.
（ホ） 作用 被検体１をホツパーを入れて、被検体が導管に充満さ
れ、検出部が異物金属を検知しない間は排出コンベアが
動いて被検体を前方へ移送し、金属異物のない良品とし
て取出す。検出部が金属異物を検知すると排出コンベア
は一定時間逆転して被検体を後方へ移送し、金属の混入
している不良品として除去する。排出コンベアの排出速
度が速くて、ホツパーからの被検体の供給が間に合わ
ず、導管内が空になると欠如検出器の信号により排出コ
ンベアは停止して、導管内に被検体が充填するまで停止
する。即ち本装置によれば、導管の検出域内に被検体が
充満された状態で、検出部の発信コイル７から電磁波が
発信され、被検体内を通つて受信コイル５で受信され、
金属異物の有無が検知されるのである。(E) Action When the object 1 is put in the hopper and the object is filled in the conduit and the detection unit does not detect the foreign metal, the discharge conveyor moves to move the object forward and make it a non-defective product. Take out. When the detection unit detects a metallic foreign substance, the discharge conveyor reverses for a certain period of time to transfer the subject backward and remove it as a defective product containing metal. The discharge speed of the discharge conveyor is high, the supply of the sample from the hopper is not in time, and when the inside of the conduit becomes empty, the discharge conveyor is stopped by the signal of the lack detector and stops until the sample is filled in the conduit. . That is, according to the present device, electromagnetic waves are emitted from the transmission coil 7 of the detection unit in a state where the detection area of the conduit is filled with the subject, and the electromagnetic waves are received by the reception coil 5 through the inside of the subject.
The presence or absence of metallic foreign matter is detected.
（ヘ） 効果 この発明による金属検出除去方法では、検出域の導管内
に、常に被検体が充満された状態で、金属検出が行われ
るので、検出域にはほぼ定量の被検体が存在し、被検体
に磁性体または導電体が均一に混入されている場合で
も、それらによる受信コイルの起電力は均一となり、検
出域の被検体通過量が多くても、被検体に混入している
小さい金属異物を容易に検出できるのである。従来の金
属検出器では検出域を通過する磁性または導電性被検体
の量が変動してノイズとなり、小さい金属異物が検出で
きなかつたのである。(F) Effect In the metal detection and removal method according to the present invention, since the metal detection is performed in a state where the analyte in the detection area is always filled, the detection area has a substantially fixed amount of the analyte. Even if a magnetic substance or a conductor is evenly mixed in the object, the electromotive force of the receiving coil due to them is uniform, and even if the amount of the object passing through the detection area is large, a small metal mixed in the object The foreign matter can be easily detected. In the conventional metal detector, the amount of the magnetic or conductive object that passes through the detection area fluctuates and becomes noise, which makes it impossible to detect a small metal foreign substance.
第１図は本発明の金属検出器である。 １……ホツパー、２……被検体 ３……被検体欠如検出器、４……導管 ５……受信コイル、６……検出域 ７……発信コイル、８……排出コンベア ９……金属異物を含まない被検体の取出方向 10……金属異物を含む被検体の取出方向 第２図はこの発明の別の実施態様を示す。 11……金属異物を含まない被検体の取出方向 12……スクリユー 13……金属異物を含む被検体の取出方向 第３図はこの発明のさらに別の実施態様の説明図であ
る。 14……シヤツター、15……導管しぼり 16……切換シユート 17……金属異物を含まない被検体の取出方向 18……金属異物を含んでいる被検体の取出方向FIG. 1 shows a metal detector of the present invention. 1 ... Hopper, 2 ... Subject 3 ... Subject lack detector, 4 ... Conduit 5 ... Receiving coil, 6 ... Detection area 7 ... Transmitting coil, 8 ... Discharge conveyor 9 ... Metal foreign matter Extraction direction of the subject not containing 10 ... Extraction direction of the subject containing metallic foreign matter FIG. 2 shows another embodiment of the present invention. 11 ... Extraction direction of object not including metallic foreign matter 12 ... Screen 13 ... Direction of extraction of object including metallic foreign matter FIG. 3 is an explanatory view of still another embodiment of the present invention. 14 …… Shutter, 15 …… Conduit squeezing 16 …… Switching shut 17 …… Takeout direction of the specimen that does not contain metallic foreign matter 18 …… Takeout direction of the specimen that contains metallic foreign matter
Claims (1)
より、磁性体または導電体が均一に混入されている被検
体、または被検体自体が磁性体または導電体である被検
体中の金属異物の検出除去を行う方法において、検出域
に被検体が規定量通過できるように流量規制通路を設
け、検出域入口側に被検体欠如検出器をおき、その信号
にもとづいて、被検体の流れを制禦して、検出域に定量
の被検体が存在する状態で、被検体に混入している金属
異物の検出を行い、検出部の信号によつて、金属異物の
混入している被検体を除去することを特長とする金属検
出除去方法1. A metal foreign substance in a subject in which a magnetic substance or a conductor is uniformly mixed by sensing an electromagnetic field or disturbance of a magnetic field, or a subject itself is a magnetic substance or a conductor. In the method of detection and removal of, the flow rate control passage is provided in the detection area so that the analyte can pass a specified amount, and the analyte lack detector is placed on the inlet side of the detection area, and the flow of the analyte is detected based on the signal. In a state where there is a fixed amount of the analyte in the detection area, the detection of the foreign metal contained in the analyte is performed. Metal detection and removal method characterized by removal
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61206853A JPH0721539B2 (en) | 1986-09-04 | 1986-09-04 | Metal detection and removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61206853A JPH0721539B2 (en) | 1986-09-04 | 1986-09-04 | Metal detection and removal method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6363986A JPS6363986A (en) | 1988-03-22 |
| JPH0721539B2 true JPH0721539B2 (en) | 1995-03-08 |
Family
ID=16530130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61206853A Expired - Fee Related JPH0721539B2 (en) | 1986-09-04 | 1986-09-04 | Metal detection and removal method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721539B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016145804A (en) * | 2015-02-04 | 2016-08-12 | 一般財団法人雑賀技術研究所 | Metal detector |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2585330Y2 (en) * | 1992-06-04 | 1998-11-18 | ティーディーケイ株式会社 | Tape cassette |
| JP6233542B1 (en) * | 2016-08-09 | 2017-11-22 | 一般財団法人雑賀技術研究所 | Metal detector |
-
1986
- 1986-09-04 JP JP61206853A patent/JPH0721539B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016145804A (en) * | 2015-02-04 | 2016-08-12 | 一般財団法人雑賀技術研究所 | Metal detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6363986A (en) | 1988-03-22 |
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