JPS5960278A - Self-diagnostic metal detector - Google Patents
Self-diagnostic metal detectorInfo
- Publication number
- JPS5960278A JPS5960278A JP57169646A JP16964682A JPS5960278A JP S5960278 A JPS5960278 A JP S5960278A JP 57169646 A JP57169646 A JP 57169646A JP 16964682 A JP16964682 A JP 16964682A JP S5960278 A JPS5960278 A JP S5960278A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- contact piece
- amplitude
- induced voltage
- circuit
- 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.)
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Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V13/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices covered by groups G01V1/00 – G01V11/00
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は、金属検出コイルの動作、感度の確認をテス
トピースを実際に流すことな〈実施できるようにした自
己診断式金属検出器J4Ilするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a self-diagnostic metal detector J4Il that allows confirmation of the operation and sensitivity of a metal detection coil without actually running a test piece.
従来、金属検出器は正しく動作しているか、あるいは必
要な感度で金属片が検知でとるようになっているかなど
の確認は、テスト用のピースとして鉄またはステンレス
の標準球を検査ラインに人手により流して確認を行って
いた。しかし、この方法ではその都度生産ラインを停止
させ、人が操作しなければ確認できないため、生産がス
トップしたり、人手が必要であった。また、異物混入の
発見を目的とするのに、検出感度が不足した場合(・ま
、不良品がそのま、良品として流れてしまうと同時に、
この障害の発見が困難で、安全側に動作するとは限らな
い欠点があった。Traditionally, to check whether a metal detector is working properly or whether metal pieces are being detected with the required sensitivity, a standard iron or stainless steel ball is manually placed on an inspection line as a test piece. I was checking it by running it. However, with this method, the production line must be stopped each time, and confirmation cannot be made without human intervention, resulting in production stoppages and the need for human intervention. Also, if the purpose is to detect foreign matter contamination, but the detection sensitivity is insufficient (・Well, at the same time, defective products are passed on as good products,
This fault is difficult to detect, and the system does not always operate safely.
上記従来例をさらに図面により説明する。The above conventional example will be further explained with reference to the drawings.
第1図は従来の金属検出器の回路図の一例である。この
図で、1は品周波電源、2は送イぎコイルで、尚周波型
#、1から″電圧み、で励保さjる。3a。FIG. 1 is an example of a circuit diagram of a conventional metal detector. In this figure, 1 is a high-frequency power supply, 2 is a sending coil, and the frequency type # is excited and maintained by looking at the voltage from 1. 3a.
3bは受信コイルで、両者の接続点は接地されてBす、
送信コイル2と電磁的に結合しており、かつ送信コイル
2との間に被検査物Mの通る検査ライン4が形成さj、
ている。そして、被検査物Mが通過しないときには、受
信コイル3a、3bKは等しい誘起電圧e1 r 晶
zが発生する。5は可変抵抗器等からなる位相調整器で
、摺動片5へは接地され、これを第1図で上方側、すな
わち、受信コイル3a側に移動すると受信フィル3a側
の並列抵抗が小さくなり、第2図のベクトル図に示すよ
う姥、誘起電圧6□ 0位相が進んで、rl となり、
誘起電圧もコ との差 ’e’H−62= 60は、6
.に対しほぼ90°進みのベクトル6p となる。3b is the receiving coil, and the connection point between the two is grounded.
It is electromagnetically coupled to the transmitting coil 2, and an inspection line 4 through which the inspected object M passes is formed between the transmitting coil 2,
ing. When the object to be inspected M does not pass, an equal induced voltage e1 r crystal z is generated in the receiving coils 3a and 3bK. 5 is a phase adjuster consisting of a variable resistor, etc., and is grounded to the sliding piece 5. When this is moved upward in FIG. 1, that is, toward the receiving coil 3a side, the parallel resistance on the receiving filter 3a side becomes smaller. , as shown in the vector diagram in Figure 2, the induced voltage 6□0 phase advances and becomes rl,
The difference between the induced voltage and the 'e'H-62=60 is 6
.. The vector 6p is approximately 90 degrees ahead of the vector.
上記と反対方向に位相rA整器5の摺動片5aを動かす
と、誘起電圧み2 の位相が進んでb′雪となり、誘起
電圧る。との差1′、−為、二みDとなり、晶、に対し
ほぼ90’進みのベクトルeo となる。When the sliding piece 5a of the phase rA adjuster 5 is moved in the opposite direction to the above, the phase of the induced voltage 2 advances to become b', and the induced voltage increases. The difference between 1' and 2 is D, resulting in a vector eo that advances approximately 90' with respect to .
6は可変抵抗器等からなる振幅調整器で、6aはその摺
動片であり、これを移動させることによって、’el−
5.=らDのる。とる2をとり出す比が変る。例えば振
幅調整器6の摺動片6aを第1図で上方側、すなわち受
信コイル3a側に移動すると、それまでh とe2が平
衝してOであった出力へが、み1 の出力の増加により
第3図のベクトル図に示すように11 と同相で現わ
れる。1は増幅器であり、8a、8bは同期検波器、9
は移相器である。6 is an amplitude adjuster consisting of a variable resistor, etc., and 6a is its sliding piece, and by moving this, 'el-
5. =RaD Noru. The ratio of taking out 2 changes. For example, when the sliding piece 6a of the amplitude adjuster 6 is moved upward in FIG. Due to the increase, it appears in phase with 11 as shown in the vector diagram of FIG. 1 is an amplifier, 8a and 8b are synchronous detectors, 9
is a phase shifter.
このような構成の従来の金属検出器においては、検査ラ
イン4に被検査物Mを流さない状態で、位相調整器5と
振幅調整器6とを調整し、同期倹シ皮器13a、8bか
ら出力が出ないようにしておき。In the conventional metal detector having such a configuration, the phase adjuster 5 and the amplitude adjuster 6 are adjusted without the inspection object M flowing through the inspection line 4, and the synchronous spacing detectors 13a and 8b are Make sure there is no output.
次いで鉄の標準球を検査ライン4に流したとき、受信コ
イル3aを通過するときは誘起電圧る1が、fた。受信
コイル3bを通過するときは誘起電圧d2 が増加する
ので、同期検波器8aから出力が得られる。し、たがっ
て、この場合は同期検波器8aの出力の有無からその金
属検出器の動作が正常かどうかが判別できる。Next, when a standard iron ball is passed through the inspection line 4, the induced voltage is f when it passes through the receiving coil 3a. Since the induced voltage d2 increases when passing through the receiving coil 3b, an output is obtained from the synchronous detector 8a. Therefore, in this case, it can be determined from the presence or absence of the output of the synchronous detector 8a whether or not the metal detector is operating normally.
次に、ステンレスの標準球を検査ライン4に流すと、こ
の標準球の中を渦@流が流れることによりpスが生ずる
。すなわち、標準球が通過する受イ6コイル3aまたは
3bの抵抗成分が変化するので、位相調整器5を動かし
たのと等価になり、これにより出力み。が現われる。こ
の出力は誘起電圧み、に対し90°進んだベクトルであ
るので、同期検波器8bから出力が得られる。したがっ
て、この場合は同期検波器8bの出力の有無からその金
属検出器の動作が正常かどうかが判別できる。Next, when a stainless steel standard ball is passed through the inspection line 4, a vortex flows through the standard ball, causing ps. That is, since the resistance component of the receiving coil 3a or 3b through which the standard bulb passes changes, it becomes equivalent to moving the phase adjuster 5, and thereby the output signal changes. appears. Since this output is a vector advanced by 90 degrees with respect to the induced voltage, the output is obtained from the synchronous detector 8b. Therefore, in this case, it can be determined from the presence or absence of the output of the synchronous detector 8b whether or not the metal detector is operating normally.
上記の動作をまとめて示すと第4図、第5図のようにな
る。The above operations are summarized as shown in FIGS. 4 and 5.
第4図は被検査物として(イ)に示すように鉄の標準球
MF0を検査ライン4に流したとき、同期検波器8a、
8bの出力を(ロ)と(ハ)に示したものである。FIG. 4 shows that when the iron standard ball MF0 is passed through the inspection line 4 as shown in (a) as the object to be inspected, the synchronous detector 8a,
The output of 8b is shown in (b) and (c).
鉄の場合、には同期検波器8bの出力は0であり、同期
検波器8aの出力はその標準球My、の速度に応じた正
弦波形となる。すなわち、受信コイル3aを通過中はる
。ンる2となり、受信コイル3bを通過中はる。<6.
となる。In the case of iron, the output of the synchronous detector 8b is 0, and the output of the synchronous detector 8a has a sine waveform corresponding to the speed of the standard ball My. That is, it continues to pass through the receiving coil 3a. The signal becomes 2, and continues to flow while passing through the receiving coil 3b. <6.
becomes.
また、第5図は被検査物として(イ)に示すようにステ
ンレスの標準球M susを検査ライン4に流したとき
、同期検波器8a、8bの出力を(ロ)と←→に示した
ものである。ステンレスの場合には同期検波器8aの出
力は0であり、同期検波器8bの出力は標準球Msus
の速度に応じた正弦波形となる。In addition, Fig. 5 shows the outputs of the synchronous detectors 8a and 8b as shown in (b) and ←→ when a stainless steel standard ball Msus is passed through the inspection line 4 as shown in (a) as the object to be inspected. It is something. In the case of stainless steel, the output of the synchronous detector 8a is 0, and the output of the synchronous detector 8b is the standard bulb Msus.
It becomes a sine waveform depending on the speed of.
そして、受信コイル3aを標準球M8U[l が通過す
るときは、誘起電圧み、の位相が進み、受信コイル3b
を標準球Mst+s が通過するときは、誘起電圧a2
の位相が進み、それぞれの同期検波信号は、正、負の
両極性の出力となる。When the standard sphere M8U[l passes through the receiving coil 3a, the phase of the induced voltage advances, and the receiving coil 3b
When the standard sphere Mst+s passes through, the induced voltage a2
The phase of each synchronous detection signal advances, and each synchronous detection signal becomes an output with both positive and negative polarities.
しかしながら、上記の従来の金属検出器では、テストピ
ースとして鉄およびステンレスの標準球Mr* * M
su8 を人手によIJ検査ライン4に流さなくて
はならない等の欠点があることは既述したとおりである
。However, in the conventional metal detector described above, iron and stainless steel standard balls Mr* * M are used as test pieces.
As already mentioned, there are drawbacks such as the need to manually flow su8 into the IJ inspection line 4.
この発明は、上述の欠点を解消するためになされたもの
で、金属検出コイルの受信コイルに鉄または非鉄金属が
検知された場合と等価な位相変化を与える回路をあらか
じめ設けておき、スイッチによりこれを選択して位相変
化や振幅変化を受信コイルに与え、テストピースを検査
ラインに流すことなく、金属検出器の動作および検出感
度の確iu4計断を行えるようにしたものであり、生産
ラインを停止することなく晶速で鉄または非鉄金属それ
ぞ才1の1金出な、その感度まで自動的に診断できるよ
’)Kした金属検出器を提供することを目的と−「る。This invention was made in order to eliminate the above-mentioned drawbacks, and a circuit is provided in advance to give a phase change equivalent to that when ferrous or non-ferrous metal is detected in the receiving coil of the metal detection coil, and a switch is used to change the phase. By applying phase changes and amplitude changes to the receiving coil by selecting the The purpose of the present invention is to provide a metal detector that can automatically diagnose ferrous or non-ferrous metals at crystal speed without stopping, and with the highest sensitivity.
以下図面によりこの発明を説明てる〇第6図はこの発明
の一実施例を示す回路図である。この図でl」λ1図と
同一符号は同じものを示しており、10a、10bはバ
ンドパスフィルタで同期検波器8a+8bの後段にそれ
ぞれ設けられる。S+ 、Szはスイッチの接片で、
開成時に抵抗器RI、R2をそれぞれ受信コイル3a、
3bに並列に接続する。Sz、S4 もスイッチの接片
で、開成時に抵抗器Ri 、R4をそれぞれ振幅調整器
6の摺・抑片6aと両端との間に並列に接続する。なお
、11は位相変化回路、12は振幅変化回路を示す。The present invention will be explained below with reference to the drawings. Figure 6 is a circuit diagram showing one embodiment of the present invention. In this figure, the same reference numerals as in the λ1 figure indicate the same components, and 10a and 10b are bandpass filters provided after the synchronous detectors 8a+8b, respectively. S+ and Sz are the contact pieces of the switch,
When opened, the resistors RI and R2 are connected to the receiving coil 3a, respectively.
Connect in parallel to 3b. Sz and S4 are also contact pieces of the switch, and when opened, resistors Ri and R4 are respectively connected in parallel between the sliding/depressing piece 6a of the amplitude regulator 6 and both ends thereof. Note that 11 represents a phase change circuit, and 12 represents an amplitude change circuit.
次に第6図の実施例の動作を第7図と第8図を参照して
説明する。Next, the operation of the embodiment shown in FIG. 6 will be explained with reference to FIGS. 7 and 8.
まず、位相a1.8整器5(IQに設けた接片S、を閉
成すると、誘起電圧み、側の位相が位相変化回路11中
の抵抗器R1の抵抗値に応じただけ進み、また、接片S
、が開き接片S2 が閉じると、抵抗器R2の抵抗値に
応じただけ誘起′rJ、圧i2 の位相が進み、第2
図に示したベクトルのように出力i。が得らハるため、
検介ライン4にステンレスの標準球MsυSを流した場
合と同じ信号が得られる。各部の波形は第7図の(イ)
〜に)に示すようになる。First, when the phase a1.8 rectifier 5 (contact S provided at IQ) is closed, the phase on the side of the induced voltage advances by an amount corresponding to the resistance value of the resistor R1 in the phase change circuit 11, and , contact piece S
, opens and contacts S2 close, the phase of induced 'rJ and pressure i2 advances according to the resistance value of resistor R2, and the second
Output i as the vector shown in the figure. In order to get the result,
The same signal as when a stainless steel standard bulb MsυS is passed through the inspection line 4 is obtained. The waveforms of each part are shown in Figure 7 (A).
).
次に、接片S3を閉じると振幅変化回路12中の抵抗器
R1の抵抗値に応じた分だけ誘起電圧晶、の振幅が大き
くなり、出力みD は第3図に示すように銹起市1圧る
。方向の電圧となる。また、接片S3が開き接片S4が
閉じると、前記とは逆に誘起′Iホ圧i と同じ方向の
出力る。が得らiする。したがって、検査ライン4を鉄
の標準球M F sを流した場合と同じ信号が得られる
。この場合の各部の波形を第8図に示す。Next, when the contact piece S3 is closed, the amplitude of the induced voltage crystal increases by an amount corresponding to the resistance value of the resistor R1 in the amplitude change circuit 12, and the output voltage D increases as shown in FIG. 1 pressure. voltage in the direction. Further, when the contact piece S3 opens and the contact piece S4 closes, an output is generated in the same direction as the induced pressure i, contrary to the above. is obtained. Therefore, the same signal as when the iron standard ball M F s is passed through the inspection line 4 can be obtained. The waveforms of each part in this case are shown in FIG.
第9図はこの発明の他の実施例を示すもので、その動作
説明のための要部の波形を第10図と第11図に示す。FIG. 9 shows another embodiment of the present invention, and FIGS. 10 and 11 show waveforms of essential parts for explaining its operation.
第9図の実施例は、第6図の実7A′1.i例にホ;け
る接片S、、S4 を1個の接片Ss K、また、接片
S3゜S、を1個の接片36 にしたものである。位
相変化回路11としては抵抗器FIB 、 R6,Rt
が直列に接続さ才1、それぞt′1.の接続点に接点
a+bが設(Jら才1、この接点arbVc接片S、が
切り換えにより接続さ」するように構成さ1ている。振
幅変化回路12も同様して、抵抗器R8r R5r
Rhoと、接点at bにより構成さtl、これにス
イッチの接片S6が設けられる。The embodiment of FIG. 9 is similar to the embodiment 7A'1. of FIG. In example i, the contact pieces S, , S4 are replaced with one contact piece SsK, and the contact piece S3°S is replaced with one contact piece 36. As the phase change circuit 11, resistors FIB, R6, Rt
are connected in series, respectively t'1. Contacts a+b are provided at the connection points of 1 and 1, and the contacts arbVc and S are connected by switching. Similarly, the amplitude change circuit 12 is connected to resistors R8r and R5r.
A contact point S6 of the switch is provided to the contact point S6.
次に動作について説明する。まず、接片S6が第9図に
示すよ5VC接点bK接触しているときは、み、二&2
となるように、すなわち、誘起1に圧61とみ、が位相
と振幅がともに同一の状態になるよ5に、−!た、接片
S、が接点aに切り換わったときは、誘起111、圧仁
の位相が進むように抵抗器R5〜R7の値が退室さ1
する。接片S、が接点aK接触している時間は、標準球
M F sまたはM 8U8 が受1、;フィル3af
:たは3bの1つを通過するのにほぼ等しい値に司んで
i6<。この時の同期検波器8bからの出力は第141
図の←→に示すように方形波となるが、バンドパスフィ
ルタ10bを通すことにより1α流分がカットさ第1、
方形波の約半分の振幅の交流波形が(」のようにイよt
ら才する。したがって、交流波形(へ)の振幅が性準球
MIIU11の検出と同じ値になるように抵抗器R6〜
R7のfMfを選ぶことにより、第6図の実施例の接片
S+ 、Szを1個の接片Ss Kよって同等な作用
をさせることができる。Next, the operation will be explained. First, when contact piece S6 is in contact with 5VC contact bK as shown in FIG.
In other words, assuming that the induction 1 is a pressure 61, both the phase and amplitude will be the same, so that -! In addition, when the contact piece S is switched to the contact point a, the values of the resistors R5 to R7 are changed so that the phase of the induction 111 and the pressure resistance advance.
do. During the time that the contact piece S is in contact with the contact point aK, the standard ball M F s or M 8U8 is in contact with the contact point aK.
: or i6 < to a value approximately equal to passing one of 3b. The output from the synchronous detector 8b at this time is the 141st
As shown in the figure, it becomes a square wave, but the 1α flow is cut off by passing it through the bandpass filter 10b.
An AC waveform with approximately half the amplitude of a square wave is
be talented. Therefore, resistors R6~
By selecting fMf of R7, the contact pieces S+ and Sz of the embodiment shown in FIG. 6 can be made to have the same effect with one contact piece SsK.
次に、接片S6を接点aに切り換えた8b合の装部の出
力波形を1A11図に示す。すなわち、この場合には、
鉄の標準球MFeを検査ライン4に流しまた場合と全く
同等の診断を行うことができる。Next, Fig. 1A11 shows the output waveform of the mounting section in case 8b when the contact piece S6 is switched to the contact point a. That is, in this case,
It is possible to carry out the same diagnosis as in the case where a standard iron ball MFe is passed through the inspection line 4.
なお、前記各実施例における位相変化回路11および振
幅変化回路12における調整手段は抵抗器のみに限定さ
ハず、曲のインピーダンス素子を用いることもできる。Note that the adjusting means in the phase change circuit 11 and amplitude change circuit 12 in each of the embodiments described above is not limited to resistors, and a musical impedance element may also be used.
また、自己診断のための動作は、被検食物Mが検査ライ
ン4をJIハ過し、たあと次の被検査物Mが到着するま
での間に行うようにすれば、常時自己診断を生産ライン
を止めることなく行うことができる。この時2自己診1
1ノi 11.第7.に生1′、る筈σ−用テ出イ、1
号が検知さ71ない場合は検査ライン4荀’R’ II
ゾf′ろがナル検斤物Mを不良と判断てるよ’) &U
1−11ば金ノ・、弓検出装brtの故障によって不
良品が流tするということも未然に防止することができ
る。In addition, if the operation for self-diagnosis is performed after the test food M passes through the inspection line 4 and before the next test object M arrives, it is possible to constantly perform self-diagnosis. This can be done without stopping the line. At this time 2 Self-examination 1
1noi 11. 7th. ni raw 1', should be sigma for te out i, 1
If no code is detected, check line 4 'R' II
Zof'ro judges the Naru test material M to be defective') &U
1-11, it is also possible to prevent defective products from being distributed due to failure of the bow detection device BRT.
以上iiY’ #llIに説明したように、この発明は
υC来の金!11険出5 trおいて、2つの受信コイ
ルの少なくとも一方の誘起′i11.圧の位相を変化さ
せる位相変化回路と、こね、を開閉するスイッチを設け
たので、位相変化回路を動作させたときは検査ラインに
非鉄金属の標準球が流才またのと同等の位相変化を上S
、[:受信コイルの誘起混圧に与えることができる。As explained above in iiY'#llI, this invention is money from υC! 11, the induction of at least one of the two receiving coils 'i11. A phase change circuit that changes the phase of the pressure and a switch that opens and closes the kneading are installed, so when the phase change circuit is operated, a standard ball made of non-ferrous metal is placed on the inspection line to produce a phase change equivalent to that of a master ball. Upper S
, [: can be given to the induced mixed pressure in the receiving coil.
才だ、同じく2つの受信コイルの少なくとも一方の誘起
′+tj圧の振幅を変化させる振幅変化回路と、こtし
を(ii1閉するスイッチを設けたので、振幅変化回路
を動作させたときは検査ラインに鉄の標準球が流れたの
と同等の振幅変化を上記受信コイルの誘起1(L圧11
CJ5えることが−ひきる。このため、従来人手により
行っていた動作確認を自動化することかできるばかりで
な(、金属検出器自体の感度の低下もlL〔らに判別す
ることができる。さらに、自動的に自己診断することが
可能なため、被検査物と被検査物との間の1寺間を利用
して高速にスイッチグのみで診断を行うことができる等
の優ねた効果がある。Similarly, we have provided an amplitude change circuit that changes the amplitude of the induced '+tj pressure in at least one of the two receiving coils and a switch that closes this (ii1), so when the amplitude change circuit is operated, it is necessary to check The amplitude change induced in the receiving coil 1 (L pressure 11
CJ5 can be drawn - pulled. For this reason, it is not only possible to automate operation checks that were conventionally performed manually (it is also possible to detect a decrease in the sensitivity of the metal detector itself; it is also possible to automatically perform self-diagnosis). This has excellent effects such as being able to perform diagnosis at high speed with only switching by utilizing one gap between the objects to be inspected.
第1図は従来の金属検出器の一例を示す回路図、第2図
、第3図は第1図の回路の動作を説、明するためのベク
トル図、第4図、第5図は同じ(第1図の回路の動作を
説明するための送信コイルを受信コイルの配置と出力波
形を示す図、第6図はこの発明の一実施例を示す回路図
、第7図、第8図は第6図の実施例の動作を説明するた
めの要部の波形図、第9図はこの発明の他の実方例を示
す回路図、第10図、第11図は第9図の実施例の動作
を説明するための装部の波形図1である。
図中、1は高周波電源、2は送信コイル、3a+3bは
受信コイル、4は検査ライン、5は位相調整器、5aは
摺動片、6は振幅調整器、Iは増幅器、8a+8bは同
期検波器、9は移相器、10a。
10bはバンドパスフィルタ、11け位a変化回h11
.12 +t nrt ’I’ij変化回路、s1〜s
6は接片、a。
bfよは点、R1〜R0は抵抗器、My、は鉄の標準球
、M811111 はステンレスの栓準球である。
386
第1図
9
第2図
第4図
(イ) ご二二二二4:凹
MFe o−〜4
2゜
(イ) 。エエエみユニ。
Msus’ −〜4
a
(ロ)Figure 1 is a circuit diagram showing an example of a conventional metal detector, Figures 2 and 3 are vector diagrams to explain the operation of the circuit in Figure 1, and Figures 4 and 5 are the same. (Figure 1 is a diagram showing the arrangement of the transmitting coil and receiving coil and the output waveform to explain the operation of the circuit. Figure 6 is a circuit diagram showing an embodiment of the present invention. Figures 7 and 8 are FIG. 6 is a waveform diagram of the main part for explaining the operation of the embodiment, FIG. 9 is a circuit diagram showing another practical example of the present invention, and FIGS. 10 and 11 are the embodiment of FIG. 9. 1 is a waveform diagram of the equipment for explaining the operation of the equipment. In the figure, 1 is a high frequency power supply, 2 is a transmitting coil, 3a+3b is a receiving coil, 4 is an inspection line, 5 is a phase adjuster, and 5a is a sliding piece. , 6 is an amplitude adjuster, I is an amplifier, 8a + 8b is a synchronous detector, 9 is a phase shifter, 10a. 10b is a band pass filter, 11 digit a change circuit h11
.. 12 +t nrt 'I'ij change circuit, s1~s
6 is a contact piece, a. bf is a point, R1 to R0 are resistors, My is an iron standard ball, and M811111 is a stainless steel stopper ball. 386 Fig. 1 9 Fig. 2 Fig. 4 (a) 22224: Concave MFe o-~4 2° (a). Eeeee uni. Msus' -~4 a (b)
Claims (1)
ルの電磁界内に被検査物が流れる検査ラインをはさんで
設置された2つの受信コイルと、この2つの受信コイル
の雨量力信号の差の出力信号を前記交流信号と同期した
信号で同期検波する同期逆波器とからなる金属検出器に
おいて:前記受信フィルの少なくとも一方の誘起電圧の
位相を非鉄金J、iの標へ11球が前記検査ラインを通
過したとき生ずる位相i丘と同等だけ変化させる位相変
化回路と;この位相変化回路を開閉するスイッチと;前
記受信コイルの少なくとも一方の誘起電圧の振幅をわく
の標準球が+1il記倹責ラインを通過したとき生ずる
振幅差と同等だけ変化させる振幅変化回路と;この振幅
液化回路を開閉するスイッチとを設けたことを特徴とす
る自己診断式金属検出器。Cross 1. (The difference between the transmitting coil driven by No. U and the two receiving coils installed across the inspection line where the inspected object flows within the electromagnetic field of this transmitting coil, and the rainfall force signal of these two receiving coils. In a metal detector consisting of a synchronous inverse wave detector that synchronously detects the output signal of a signal synchronized with the alternating current signal, the phase of the induced voltage of at least one of the receiving filters is set to the non-ferrous metal J, i mark by 11 balls. a phase change circuit that changes the phase by an amount equivalent to the phase i that occurs when passing through the inspection line; a switch that opens and closes this phase change circuit; A self-diagnosis type metal detector characterized in that it is provided with an amplitude changing circuit that changes the amplitude by an amount equal to the amplitude difference that occurs when passing through the liquefaction line; and a switch that opens and closes the amplitude liquefaction circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57169646A JPS5960278A (en) | 1982-09-30 | 1982-09-30 | Self-diagnostic metal detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP57169646A JPS5960278A (en) | 1982-09-30 | 1982-09-30 | Self-diagnostic metal detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5960278A true JPS5960278A (en) | 1984-04-06 |
JPS6335946B2 JPS6335946B2 (en) | 1988-07-18 |
Family
ID=15890334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP57169646A Granted JPS5960278A (en) | 1982-09-30 | 1982-09-30 | Self-diagnostic metal detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5960278A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011237287A (en) * | 2010-05-11 | 2011-11-24 | Eminet Co Ltd | Metal detecting device |
JP2019002709A (en) * | 2017-06-12 | 2019-01-10 | 日新電子工業株式会社 | Metal detector and diagnosis method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0248848U (en) * | 1988-09-29 | 1990-04-04 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5047684A (en) * | 1973-08-14 | 1975-04-28 | ||
JPS5526427U (en) * | 1978-08-10 | 1980-02-20 |
-
1982
- 1982-09-30 JP JP57169646A patent/JPS5960278A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5047684A (en) * | 1973-08-14 | 1975-04-28 | ||
JPS5526427U (en) * | 1978-08-10 | 1980-02-20 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011237287A (en) * | 2010-05-11 | 2011-11-24 | Eminet Co Ltd | Metal detecting device |
JP2019002709A (en) * | 2017-06-12 | 2019-01-10 | 日新電子工業株式会社 | Metal detector and diagnosis method |
Also Published As
Publication number | Publication date |
---|---|
JPS6335946B2 (en) | 1988-07-18 |
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