JPH0664184U - Inductive conductor detector - Google Patents
Inductive conductor detectorInfo
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- JPH0664184U JPH0664184U JP963993U JP963993U JPH0664184U JP H0664184 U JPH0664184 U JP H0664184U JP 963993 U JP963993 U JP 963993U JP 963993 U JP963993 U JP 963993U JP H0664184 U JPH0664184 U JP H0664184U
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Abstract
(57)【要約】 （修正有）
【目的】 短い距離で設定された複数の検出点で導電体
の近接を非接触で正確に検知することを可能とする。
【構成】 一次コイル２１、２１’と、一次コイルに電
磁的に結合された２個の二次コイル２２、２２、２
２’、２２’とを近接して配置して構成された検出コイ
ル部２０、２０’を、２個、直列に配置し、２つの検出
点Ｈ1、Ｈ2で導電体の近接を非接触で検出する。これら
検出コイル部２０、２０’を、それぞれの一次コイル２
１、２１’が発生する磁界の方向が互いに打ち消し合う
方向になるように配置する。これにより、隣接する検出
コイル部の一次コイルからの漏洩磁束による悪影響を解
消し、複数の検出コイルを直列に近づけて配置しても誤
動作せず、複数の検出点での導電体の近接の検出が可能
となると同時に、検出点間の距離Ｌを小さく出来る。
(57) [Summary] (Correction) [Purpose] It is possible to accurately detect the proximity of conductors at a plurality of detection points set at short distances without contact. [Structure] A primary coil 21, 21 'and two secondary coils 22, 22, 2 electromagnetically coupled to the primary coil
2 ', 22' of the detection coil unit 20, 20 that is configured by arranged close to and ', two, arranged in series, a non-contact proximity conductor at two detection points H 1, H 2 Detect with. These detection coil units 20 and 20 'are connected to the respective primary coils 2
The magnetic fields generated by 1 and 21 'are arranged so as to cancel each other. This eliminates the adverse effect of the magnetic flux leaking from the primary coil of the adjacent detection coil section, does not cause malfunction even if multiple detection coils are arranged close to each other in series, and detects the proximity of conductors at multiple detection points. At the same time, the distance L between the detection points can be reduced.
Description
【０００１】[0001]
本考案は金属等の導電体の位置を非接触で検出することの可能な検出装置に関 し、特に、一次コイルと二次コイル間の電磁誘導結合を利用して検出する誘導式 導電体検出装置に関する。 The present invention relates to a detection device capable of detecting the position of a conductor such as a metal in a non-contact manner, and in particular, an inductive conductor detection that detects by utilizing electromagnetic inductive coupling between a primary coil and a secondary coil. Regarding the device.
【０００２】[0002]
従来、例えば溶融金属など、導電性を示す高温液体の液面や液位を非接触で検 出する検出器として、一次コイルと二次コイル間の電磁誘導結合を利用した誘導 式導電体検出装置が広く用いられている。かかる誘導式導電体検出装置は、一般 に、例えば図５にも示すように、一次コイル１の上下に２個の二次コイル（検出 コイル）２、２を直列に配置し、一方、一次コイル１に交流信号を加えながら、 上下に配置された二次コイル２、２内に誘導される信号を検出し、これらを比較 器３により比較しながら液面や液位を非接触で検知するものである。 Conventionally, an inductive conductor detection device that uses electromagnetic inductive coupling between a primary coil and a secondary coil as a detector that detects the liquid level and liquid level of a conductive high temperature liquid such as molten metal in a non-contact manner. Is widely used. Such an inductive conductor detecting device generally has two secondary coils (detection coils) 2 and 2 arranged in series above and below a primary coil 1, as shown in FIG. A signal that is induced in the upper and lower secondary coils 2 and 2 is detected while applying an AC signal to 1 and the liquid level and liquid level are detected in a non-contact manner by comparing them with a comparator 3. Is.
【０００３】 かかる誘導式導電体検出装置の一例が、例えば特開平３−８２９０１号公報や 特開平３−８２９８７号公報により知られている。しかしながら、上記の従来技 術においては、誘導式導電体検出装置により、導電体の液面が所定の位置に近接 したことを唯一つの検出点を基準にして判断するものであり、この検出点を多数 配列して多段階に判断するものではなかった。An example of such an inductive type conductor detecting device is known from, for example, Japanese Patent Application Laid-Open No. 3-82901 and Japanese Patent Application Laid-Open No. 3-82987. However, in the above-mentioned conventional technique, the inductive conductor detection device determines that the liquid surface of the conductor is close to a predetermined position based on only one detection point. It was not intended to make multiple arrangements and judge in multiple stages.
【０００４】 一方、例えば溶融金属の液面を検出する場合、複数の検出点に対応するための 方式としては、添付の図４に示すように、溶融金属内に沈設されるセラミックシ ース１０内に、一次コイル２１の上下に２個の二次コイル２２、２２を直列に配 置してなる検出コイル部２０を複数個（図では２０、２０’）、縦方向に配列す ることが考えられる。しかしながら、これら検出点間の距離を短縮するため、複 数の検出コイル部２０、２０’を互いに近接して配置した場合、これら検出コイ ル部が相互に干渉し合い、そのため、良好な検出結果が得られないという問題点 があった。On the other hand, in the case of detecting the liquid level of molten metal, for example, as a method for dealing with a plurality of detection points, as shown in the attached FIG. It is possible to arrange a plurality of detection coil units 20 (20, 20 ′ in the figure) in which two secondary coils 22 and 22 are arranged in series above and below the primary coil 21 in the vertical direction. Conceivable. However, in order to reduce the distance between these detection points, when the plurality of detection coil units 20 and 20 'are arranged close to each other, these detection coil units interfere with each other, which results in a good detection result. There was a problem that was not obtained.
【０００５】[0005]
そこで、本考案では、上記従来技術における問題点に鑑み、複数の検出コイル 部を配置して複数の検出点で導電体の近接を非接触で正確に検知し、かつ、それ ら複数の検出点を近づけて設定することも可能な、応用適用範囲の広い、改良さ れた構造の誘導式導電体検出装置を提供することをその目的とする。 Therefore, in the present invention, in view of the above-mentioned problems in the prior art, a plurality of detection coil portions are arranged to accurately detect the proximity of a conductor at a plurality of detection points in a non-contact manner, and the plurality of detection points are detected. It is an object of the present invention to provide an inductive conductor detection device having an improved structure, which can be set close to each other and has a wide range of applications and applications.
【０００６】[0006]
すなわち、上記の目的を達成するため本考案によって提案する手段は、添付の 図面を参照しながら説明すると、一次コイル２１（２１’）と、一次コイルに電 磁的に結合された２個の二次コイル２２、２２（２２’、２２’）とを近接して 配置して構成された複数の検出コイル部２０（２０’）を近接して配列する誘導 式導電体検出装置において、これら検出コイル部２０（２０’）の配置を、それ ぞれの一次コイル２１（２１’）が発生する磁界の方向が互いに打ち消し合う方 向になるように配置したものである。 That is, the means proposed by the present invention for achieving the above object will be described with reference to the accompanying drawings, in which a primary coil 21 (21 ') and two magnetic coils that are electromagnetically coupled to the primary coil. In an inductive conductor detection device in which a plurality of detection coil units 20 (20 ′) configured by arranging the following coils 22 and 22 (22 ′, 22 ′) in close proximity are arranged in close proximity, The parts 20 (20 ′) are arranged such that the magnetic fields generated by the primary coils 21 (21 ′) of the respective parts 20 (20 ′) cancel each other out.
【０００７】[0007]
上記の本考案による誘導式導電体検出装置によれば、検出コイル部２０（２０ ’）の一次コイル２１（２１’）に交流信号を印加すると共に、二次コイル２２ 、２２（２２’、２２’）に誘導される信号を比較器２３（２３’）により比較 しながら複数の検出点に近接する導電体の位置を非接触で検出するが、さらに、 一次コイル２１（２１’）の配列を、発生する磁界同士が互いに打ち消し合う方 向にすることにより、隣接する検出コイル部の一次コイルからの漏洩磁束（磁界 ）を互いに打ち消し合って相互の悪影響を解消することから、これら検出コイル 部２０（２０’）間の配置距離、すなわち、検出点間距離を小さくしても誤動作 を生ぜずに導電体の近接を正確に検出することをが可能になる。 According to the above-described inductive conductor detection device of the present invention, an AC signal is applied to the primary coil 21 (21 ') of the detection coil unit 20 (20') and the secondary coils 22 and 22 (22 'and 22') are connected. While detecting the position of the conductor close to a plurality of detection points in a non-contact manner while comparing the signal induced in ') with the comparator 23 (23'), the arrangement of the primary coil 21 (21 ') , The generated magnetic fields are directed so as to cancel each other, so that the leakage magnetic fluxes (magnetic fields) from the primary coils of the adjacent detection coil parts cancel each other out to eliminate the adverse effects of each other. Even if the arrangement distance between (20 ′), that is, the distance between the detection points is reduced, it is possible to accurately detect the proximity of the conductor without causing a malfunction.
【０００８】[0008]
【実施例】 以下、本考案の実施例について、添付の図面を参照しながら詳細に説明する。 図２には、本考案の誘導式導電体検出装置の特徴部分である検出コイル部が示 されており、この図において、例えば溶融金属の液面を検出するため、溶融炉内 に沈設される円筒状のセラミックシース１０内には、２個の検出コイル部２０、 ２０’が縦方向に直列に配置されている。これらの２個の検出コイル部２０、２ ０’は、それぞれ、図示されない磁性体コア上に巻装された一次コイル２１（２ １’）と、その両端に巻装された二次コイル２２、２２（２２’、２２’）とか ら構成されている。そして、これら２個の検出コイル部２０、２０’は、前記円 筒状のセラミックシース１０内において、縦方向に直接に、互いに近接した位置 に配置されている。なお、上記の各検出コイル部２０、２０’は、その外形は円 筒形状となっており、また、その寸法は回転軸方向の長さがＤ、外径がｄとなっ ている。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 shows a detection coil portion which is a characteristic part of the inductive conductor detection device of the present invention. In this figure, for example, the detection coil portion is sunk in a melting furnace in order to detect the liquid level of molten metal. In the cylindrical ceramic sheath 10, two detection coil units 20 and 20 'are arranged in series in the vertical direction. These two detection coil units 20 and 20 ′ are respectively composed of a primary coil 21 (21 ′) wound on a magnetic core (not shown) and a secondary coil 22 wound on both ends thereof. 22 (22 ', 22'). And these two detection coil parts 20 and 20 'are arrange | positioned in the said cylindrical ceramic sheath 10 at the position directly adjacent to each other in the vertical direction. The outer shape of each of the detection coil units 20 and 20 'is a cylindrical shape, and the dimensions thereof are D in the length in the rotation axis direction and d in the outer diameter.
【０００９】 図１には、上記検出コイル部２０、２０’を含む検出回路の回路構成が示され ており、各検出コイル部２０（２０’）の一次コイル２１（２１’）には、交流 電源３０からの交流信号が供給されている。一方、一次コイル２１（２１’）に よって発生された磁界あるいは磁束（図中に破線で示す）は、コイル中央部の磁 性体コアを介して両端の二次コイル２２、２２（２２’、２２’）に交差し、そ れぞれ、二次コイル２２、２２（２２’、２２’）内に誘導起電力による出力を 発生する。これら二次コイル２２、２２（２２’、２２’）内に誘導された電気 信号は、それぞれ比較器２３（２３’）の正（＋）と負（−）の入力端子に導か れ、その比較器２３（２３’）により差動比較される。その結果、各比較器２３ 、２３’は、図３に示すように、溶融金属などの導電体の液面レベル（Ｈ）がそ の検出点（すなわち、一次コイル２１（２１’）の中央部Ｈ1（Ｈ2））から離れ ている場合には、その出力が零であるが、この液面Ｈが検出点Ｈ1（Ｈ2）に近接 するに従って上昇する出力を生じる。この出力は、液面Ｈが検出点Ｈ1（Ｈ2）に 達すると最大値を示し、その後、この検出点Ｈ1（Ｈ2）を越えるに従ってその出 力も徐々に減少して再び零になる。FIG. 1 shows a circuit configuration of a detection circuit including the above detection coil units 20 and 20 ′. The primary coil 21 (21 ′) of each detection coil unit 20 (20 ′) has an AC An AC signal from the power source 30 is supplied. On the other hand, the magnetic field or magnetic flux (indicated by the broken line in the figure) generated by the primary coil 21 (21 ') is passed through the magnetic core at the center of the coil to the secondary coils 22, 22 (22', 22) at both ends. 22 '), and each produces an output due to an induced electromotive force in the secondary coils 22, 22 (22', 22 '). The electric signals induced in the secondary coils 22, 22 (22 ', 22') are introduced to the positive (+) and negative (-) input terminals of the comparator 23 (23 '), respectively, and the comparison is performed. The differential comparison is performed by the device 23 (23 '). As a result, as shown in FIG. 3, each of the comparators 23, 23 'has a liquid level (H) of a conductor such as molten metal at the detection point (that is, the central portion of the primary coil 21 (21')). When it is far from H 1 (H 2 ), its output is zero, but as the liquid level H approaches the detection point H 1 (H 2 ), an output rises. This output shows a maximum value when the liquid level H reaches the detection point H 1 (H 2 ), and thereafter, as the detection point H 1 (H 2 ) is exceeded, the output gradually decreases and becomes zero again. .
【００１０】 ところで、これら複数（本実施例では２個）の検出コイル部２０、２０’を縦 方向に直列に近つけて配置した場合、検出コイル部２０、２０’相互間には、い わゆる電磁的な干渉を生じてしまう。すなわち、図４にも示すように、セラミッ クシース１０内に上下に近づいて配置された一方（例えば、上方）の検出コイル 部２０は、その一次コイル２１に発生した磁界あるいは磁束が、他方（下方）の 検出コイル部２０’内の上方に配置された二次コイル２２’内に漏洩して誘導出 力を発生させ、これにより、比較器２３’に誤出力を発生させてしまう。かかる 構成においては、考案者による種々の実験の結果によれば、これら検出コイル部 ２０、２０’が相互に干渉せずに安定に動作するに必要な相互距離Ｌ（すなわち 、検出コイル部２０、２０’の中点間の距離）は、Ｌ≧Ｄ＋３ｄなる条件を満た す必要がある（Ｄ：円筒形状の検出コイル部２０、２０’の回転軸方向の長さ、 ｄ：外径）。そのため、これら２個の検出コイル部２０、２０’を隣接して配置 し、複数の検出点で導電体の液面を検知する場合、これら検出点間の距離を上記 のＬ以上に設定しなければならず、これでは、複数の検出点を設定する場合の問 題となる。By the way, when a plurality of (two in the present embodiment) detection coil units 20 and 20 ′ are arranged close to each other in series in the vertical direction, there is no difference between the detection coil units 20 and 20 ′. It causes loose electromagnetic interference. That is, as also shown in FIG. 4, one (for example, upper) detection coil unit 20 arranged vertically close to the inside of the ceramic sheath 10 has a magnetic field or magnetic flux generated in the primary coil 21 of the other (lower). ) Leaks into the secondary coil 22 'disposed above the detection coil unit 20' to generate an inductive output, which causes an erroneous output in the comparator 23 '. In such a configuration, according to the results of various experiments by the inventor, the mutual distance L (that is, the detection coil unit 20, 20 ′) necessary for the detection coil units 20 and 20 ′ to operate stably without mutual interference. The distance between the middle points of 20 ') must satisfy the condition of L ≧ D + 3d (D: length of the cylindrical detection coil unit 20, 20' in the rotation axis direction, d: outer diameter). Therefore, when these two detection coil units 20 and 20 'are arranged adjacent to each other and the liquid level of the conductor is detected at a plurality of detection points, the distance between these detection points must be set to L or more above. This is a problem when setting multiple detection points.
【００１１】 そこで、本考案では、これら２個の検出コイル部２０、２０’を隣接して配置 した場合の複数の検出点間の距離を短縮するため、図１及び図２に示すように、 各検出コイル部２０、２０’の一次コイル２１、２１’の配列を、発生する磁界 同士が互いに打ち消し合う方向にしたものである。すなわち、図１の電気回路に よれば、上記一次コイル２１、２１’に交流信号を供給する交流電源３０は、上 下に隣接する検出コイル部２０、２０’の一次コイル２１、２１’に供給される 交流信号が互いに逆位相になるように接続されている。これにより、図１及び図 ２に示すように、隣接する検出コイル部２０、２０’の一次コイル２１、２１’ により発生される磁界は、図に矢印で示すように、互いに逆方向になる。Therefore, in the present invention, in order to shorten the distance between a plurality of detection points when these two detection coil units 20 and 20 ′ are arranged adjacent to each other, as shown in FIGS. The primary coils 21, 21 'of the respective detection coil units 20, 20' are arranged so that the generated magnetic fields cancel each other. That is, according to the electric circuit of FIG. 1, the AC power supply 30 that supplies an AC signal to the primary coils 21 and 21 ′ is supplied to the primary coils 21 and 21 ′ that are adjacent to the upper and lower detection coil units 20 and 20 ′. The AC signals are connected so that they have opposite phases. As a result, as shown in FIGS. 1 and 2, the magnetic fields generated by the primary coils 21 and 21 'of the adjacent detection coil units 20 and 20' are in mutually opposite directions as indicated by arrows in the drawings.
【００１２】 このように、隣接する検出コイル部２０、２０’の一次コイル２１、２１’の 配置を、互いに電磁的に逆方向に配置することにより、図２に示すように、隣接 し合う二次コイル２２、２２’同士は互いに電磁的に干渉し合うが、その方向が 逆方向となることから互いに打ち消し合い、誤動作を生じず、むしろ、図３に実 線で示すように、隣接側における比較器２３、２３’からの出力の傾斜が大きく 、すなわち、半値巾が小さくなりＱ特性が良いこととなる。そのため、検出コイ ル部２０、２０’間の距離を小さく、すなわち、検出点間の距離Ｌを小さくする ことが可能になる。なお、本考案者による実験によれば、Ｌ＞Ｄなる条件（Ｄ： 円筒形状の検出コイル部２０、２０’の回転軸方向の長さ）を満たせば、各比較 器２３、２３’が十分な検出出力を出力できることが確認されている。これによ り、例えば溶融金属炉内に沈設してその液面レベルを検知する場合、従来の検出 レベルの設定条件（Ｌ≧Ｄ＋３ｄ）よりも近接した距離（Ｌ＞Ｄ）で設定するこ とが可能になることから、複数の検出レベルを設定する際の自由度を大幅に向上 することが可能になり、さらには、誘導式導電体検出装置の利用範囲を拡大する ことにもつながることとなる。As described above, by disposing the primary coils 21 and 21 ′ of the adjacent detection coil units 20 and 20 ′ in the directions opposite to each other electromagnetically, as shown in FIG. The secondary coils 22 and 22 'electromagnetically interfere with each other, but the directions are opposite to each other, so that they cancel each other out and no malfunction occurs. Rather, as shown by the solid line in FIG. The slope of the output from the comparators 23 and 23 'is large, that is, the full width at half maximum is small and the Q characteristic is good. Therefore, the distance between the detection coil units 20 and 20 'can be reduced, that is, the distance L between the detection points can be reduced. According to an experiment conducted by the present inventor, each of the comparators 23 and 23 'is sufficient if the condition of L> D (D: length of the cylindrical detection coil unit 20, 20' in the rotation axis direction) is satisfied. It has been confirmed that various detection outputs can be output. With this, for example, when the liquid level is detected by immersing in a molten metal furnace, the distance (L> D) should be set closer than the conventional detection level setting condition (L ≧ D + 3d). This makes it possible to significantly improve the degree of freedom when setting multiple detection levels, and also to expand the range of use of the inductive conductor detection device. Become.
【００１３】[0013]
上記の本考案の詳細な説明からも明かな様に、本考案による誘導式導電体検出 装置によれば、その動作上、各検出コイル部の検出点間に必要な距離を、より短 くすることを可能にすることから、誘導式導電体検出装置の検知レベルをより自 由に設定することが可能になり、かつ、その利用範囲を拡大することが可能なる という効果を発揮する。 As is clear from the above detailed description of the present invention, according to the inductive conductor detection device of the present invention, the distance required between the detection points of the respective detection coil portions is shortened due to its operation. This makes it possible to set the detection level of the inductive conductor detection device more freely and to expand the range of use.
【図１】本考案の実施例である誘導式導電体検出装置の
回路構成を示す電気回路図である。FIG. 1 is an electric circuit diagram showing a circuit configuration of an inductive conductor detecting device according to an embodiment of the present invention.
【図２】上記誘導式導電体検出装置の検出コイル部の内
部詳細構造を示す断面図である。FIG. 2 is a cross-sectional view showing an internal detailed structure of a detection coil portion of the inductive conductor detection device.
【図３】上記誘導式導電体検出装置の検出出力の波形の
一例を示すグラフである。FIG. 3 is a graph showing an example of a waveform of a detection output of the inductive conductor detection device.
【図４】上記図２に示す配列を対比して説明するため、
検出コイル部の通常の配列状態を示した断面図である。FIG. 4 is a diagram for explaining the arrangement shown in FIG. 2 in comparison.
It is sectional drawing which showed the normal arrangement state of a detection coil part.
【図５】従来の誘導式導電体検出装置の基本原理構造の
一例を示す図である。FIG. 5 is a diagram showing an example of a basic principle structure of a conventional inductive conductor detection device.
１０ セラミックシース ２０ 検出コイル部 ２１（２１’） 一次コイル ２２（２２’） 二次コイル ２３（２３’） 比較器 ３０ 交流源 10 Ceramic sheath 20 Detection coil part 21 (21 ') Primary coil 22 (22') Secondary coil 23 (23 ') Comparator 30 AC source
Claims (1)
に結合された少なくとも２個の二次コイルとを互いに近
接して配置し、前記一次コイルに交流信号を印加すると
共に、前記２個の二次コイルに誘導される信号を比較器
により比較しながら近接する導電体の位置を検出する複
数の検出コイル部を直列状に配列してなる誘導式導電体
検出装置において、前記複数設けられた検出コイル部の
それぞれの一次コイルを、それらが発生する磁界同士が
互いに打ち消し合う方向に配列したことを特徴とする誘
導式導電体検出装置。1. A primary coil and at least two secondary coils electromagnetically coupled to the primary coil are arranged close to each other, and an AC signal is applied to the primary coil, and the two primary coils are applied. A plurality of detection coil units are arranged in series to detect the positions of adjacent conductors while comparing the signals induced in the secondary coil with a comparator, and the plurality of detection coil units are provided. An inductive conductor detection device, wherein each primary coil of the detection coil unit is arranged in a direction in which magnetic fields generated by the detection coils cancel each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993009639U JPH0745031Y2 (en) | 1993-02-13 | 1993-02-13 | Inductive conductor detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1993009639U JPH0745031Y2 (en) | 1993-02-13 | 1993-02-13 | Inductive conductor detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0664184U true JPH0664184U (en) | 1994-09-09 |
| JPH0745031Y2 JPH0745031Y2 (en) | 1995-10-11 |
Family
ID=11725804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1993009639U Expired - Lifetime JPH0745031Y2 (en) | 1993-02-13 | 1993-02-13 | Inductive conductor detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0745031Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245953A (en) * | 1975-10-09 | 1977-04-12 | Nippon Steel Corp | Method for inspecting metal body by use of disturbances in blanced |
| JPS537262A (en) * | 1976-07-08 | 1978-01-23 | Mishima Kosan Co Ltd | Apparatus for detecting end of metal material |
| JPH0382987A (en) * | 1989-08-26 | 1991-04-08 | Sukegawa Electric Co Ltd | Induction type conductor detector |
-
1993
- 1993-02-13 JP JP1993009639U patent/JPH0745031Y2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5245953A (en) * | 1975-10-09 | 1977-04-12 | Nippon Steel Corp | Method for inspecting metal body by use of disturbances in blanced |
| JPS537262A (en) * | 1976-07-08 | 1978-01-23 | Mishima Kosan Co Ltd | Apparatus for detecting end of metal material |
| JPH0382987A (en) * | 1989-08-26 | 1991-04-08 | Sukegawa Electric Co Ltd | Induction type conductor detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0745031Y2 (en) | 1995-10-11 |
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