JP2007187566A - Method and device for detecting missing magnetic metal member - Google Patents

Method and device for detecting missing magnetic metal member Download PDF

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JP2007187566A
JP2007187566A JP2006006208A JP2006006208A JP2007187566A JP 2007187566 A JP2007187566 A JP 2007187566A JP 2006006208 A JP2006006208 A JP 2006006208A JP 2006006208 A JP2006006208 A JP 2006006208A JP 2007187566 A JP2007187566 A JP 2007187566A
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magnetic metal
metal member
permanent magnet
force
missing
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JP4412670B2 (en )
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Kunihiko Fujita
Miyuki Sato
幸 佐藤
邦彦 藤田
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Ryoei Engineering Kk
Toyota Motor Corp
トヨタ自動車株式会社
菱栄エンジニアリング株式会社
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<P>PROBLEM TO BE SOLVED: To surely detect a missing magnetic metal component with a simple structure without adding an electronic circuit. <P>SOLUTION: In a method of detecting the missing magnetic metal member, a permanent magnet 5 arranged separately at a fixed distance from an inspection object 10 is attracted by the magnetic metal member 11 of the inspection object 10 not floating by an attracting force of the permanent magnet 5, and a force attracting the permanent magnet 5 is transmitted to a load cell 3, to thereby detect omission of the magnetic metal member 11. A device for detecting the missing magnetic metal member comprises the permanent magnet 5 arranged separately at the fixed distance from the inspection object 10 not floating by the attracting force of the permanent magnet 5, and the load cell 3 for detecting directly a force applied to the permanent magnet 5 by being attracted by the magnetic metal member 11 of the inspection object 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は磁性金属部材が成形品の所定位置に取り付けられているかを検査する磁性金属部材の欠落検出方法およびその装置に関するものである。 The present invention relates to loss detecting method and apparatus of the magnetic metal member to check whether the magnetic metal member is attached to a predetermined position of the molded article.

従来、プラスチックス成形品にインサートされる磁性金属よりなるナットやボルト、あるいはアルミ製のエンジンブロックに一体的にインサートされる磁性金属よりなるシリンダライナ等のインサート部材の欠落は、目視検査やシリンダライナ内に近接スイッチを挿入配置させて行うのが一般的であった。 Conventionally, the missing of the insert member of the cylinder liner or the like made of a magnetic metal which is integrally insert nuts and bolts or aluminum engine block, made of a magnetic metal being inserted into plastic moldings, visual inspection and the cylinder liner performed by a proximity switch is inserted in the inside it was common. しかし、目視検査では検査ミスをなくすることが難しいうえに省力化を推進できないという問題があった。 However, in the visual inspection there is a problem that can not be promoting labor-saving on top it is difficult to eliminate the inspection mistakes. また、近接スイッチによる検査では移送されてくるエンジンブロックを検査毎に停止させる必要があり、製造ラインの速度を低下させるという問題があった。 Further, the inspection by the proximity switch must be stopped for each inspection engine block coming transported, there is a problem that reduces the speed of the production line. また、各種繊維製品に混入する折れ針や待ち針等の磁性金属部品を永久磁石で探知するものがある(例えば、特許文献2参照)。 Further, there is a magnetic metal parts such as broken needles and dress pin mixed into various fiber products those which detect a permanent magnet (e.g., see Patent Document 2). さらに、微小変位を永久磁石と超磁歪素子により検出するものがある(例えば、特許文献3参照)。 Furthermore, there is one that detects a small displacement by the permanent magnet and the giant magnetostrictive element (for example, see Patent Document 3). また、磁性体検出装置として磁石と磁気センサとを備えたものがある(例えば、特許文献1参照)。 Further, there is provided with a magnet and a magnetic sensor as the magnetic body detection device (for example, see Patent Document 1).

しかし、永久磁石の直流磁界中の直流磁束と鎖交する磁性金属部材とにより生じる電圧から磁性金属部品を検出する特許文献2のものは、第1と第2の検出コイルに発生した検出信号は微弱であるため新たな電子回路を付加する必要があり、装置が複雑で高価なものとなる問題があった。 However, those from the voltage generated by the DC magnetic flux interlinked with the magnetic metal member in the DC magnetic field of the permanent magnet of Patent Document 2 for detecting the magnetic metal parts, the detection signal generated in the first and second detection coils it is necessary to add a new electronic circuit because it is weak, there is a problem that becomes apparatus is complicated and expensive. また、特許文献3のものも磁力を超磁歪素子により検出するものであるから、前記と同様に電子回路が必要となり、装置が複雑で高価なものとなる問題があった。 Further, since also the magnetic force in Patent Document 3 is for detecting the super-magnetostrictive element, an electronic circuit is required in the same manner as described above, there is a problem that becomes apparatus is complicated and expensive. 特許文献1のものも磁気センサの検知結果に基づきCPUにより判断を行うものであり、装置が高価となる問題があった。 Also in Patent Document 1 is intended to make decisions by the CPU based on the detection result of the magnetic sensor, there is a problem that the apparatus becomes expensive.
特開平8−304007号公報 JP-8-304007 discloses 特開平10−90431号公報 JP-10-90431 discloses 特開2005−43239号公報 JP 2005-43239 JP

解決しようとする問題点は、電子回路を付加することなく簡単な構造で磁性金属部品を確実で検出することができる磁性金属部材の欠落検出方法およびその装置を提供することを目的とするものである。 A problem to be solved is for the purpose of providing the missing detection method and apparatus of the magnetic metal member capable of detecting a reliable magnetic metal parts with a simple structure without adding an electronic circuit is there.

本発明は、永久磁石の吸着力により浮動することのない被検査体の磁性金属部材が該被検査体と一定距離離隔させて配置される永久磁石を吸引し、該永久磁石が吸引される力を荷重計に伝達して磁性金属部材の欠落を検知する磁性金属部材の欠落検出方法を請求項1の発明とし、永久磁石の吸着力により浮動することがない被検査体と一定距離離隔されて配置される永久磁石と、被検査体の磁性金属部材に吸引されることによって永久磁石に加えられる力を直接検出する荷重計とからなる磁性金属部材の欠落検出装置を請求項2の発明とし、請求項2の発明において、永久磁石と被検査体が相対的に移動されて走査が行われる磁性金属部材の欠落検出装置を請求項3の発明とし、請求項2または3の発明において、二つの永久磁石を筒状の磁 The present invention sucks the permanent magnet magnetic metal member that no inspection object to float by suction force of the permanent magnets are arranged with a predetermined distance apart from the obtaining step body, the force which the permanent magnets are attracted the missing detection method of the magnetic metal member for detecting the absence of a magnetic metal member is transmitted to the load cell a first aspect of the present invention, is a predetermined distance apart from the object to be inspected is not possible to float the suction force of the permanent magnet a permanent magnet is disposed, the loss detecting apparatus invention of claim 2 of the magnetic metal member composed of a load cell for detecting the magnetic metal member force applied to the permanent magnet by being sucked into the device under test directly, in the invention of claim 2, the loss detecting unit of the magnetic metal member by the permanent magnet and the object to be inspected is scanned are relative movement is performed as the invention of claim 3, in the invention of claim 2 or 3, the two magnetic permanent magnet tubular 金属部材の外径位置に対向させて臨ませるとともに走査方向と直交するように配置させた磁性金属部材の欠落検出装置を請求項4の発明とし、請求項4の発明において、永久磁石の極性を異なせた磁性金属部材の欠落検出装置を請求項5とするものである。 The loss detecting device of a magnetic metal member is arranged perpendicular to the scanning direction causes face to face the outer diameter position of the metal member and the invention of claim 4, in the invention of claim 4, the polarity of the permanent magnet missing detection device different causes magnetic metal member is intended to claim 5.

本発明は、永久磁石の吸着力により浮動することのない被検査体の磁性金属部材が該被検査体と一定距離離隔させて配置される永久磁石を吸引し、該永久磁石が吸引される力を荷重計に伝達して磁性金属部材の欠落を検知するものであるから、永久磁石にかかる吸引力は荷重計に直接かかるので、荷重計は永久磁石に対する吸引力を直接検出することとなって従来の磁力を検出する装置より簡単な構造となり、新たな電子回路を付加させることなく磁性金属部材を高精度で検知することができる。 The present invention sucks the permanent magnet magnetic metal member that no inspection object to float by suction force of the permanent magnets are arranged with a predetermined distance apart from the obtaining step body, the force which the permanent magnets are attracted since then transmitted to the load cell which detects the lack of magnetic metal members, the suction force applied to the permanent magnet so directly applied to load cell, load meter becomes possible to detect the suction force against the permanent magnet directly It becomes simple structure than device for detecting a conventional magnetic force can be detected magnetic metal member without adding a new electronic circuit with high precision. また、駆動機構が必要ないので故障が生じにくいうえに非接触による検出であるため摩耗や損傷が生じ難く長期耐用できるものとなる。 Further, it is assumed that wear and damage because it is detected by non-contact in terms of failure since the drive mechanism is not required is less likely to occur can hardly long life occur.

また、請求項3のように、永久磁石と被検査体が相対的に移動されて走査が行われるものとすることにより、最小の永久磁石数で広い面積を有する被検査体の検査が可能となる。 Furthermore, as according to claim 3, by the permanent magnet and the object to be inspected is assumed to scan the relatively moving is performed, enabling inspection of the inspection object having a large area with a minimum number of permanent magnets Become. また、永久磁石を固定として被検査体を可動するものとすれば、製造ライン等から搬送されていく被検査体を検査することができる。 Further, if those moving the object to be inspected permanent magnets as fixed, it is possible to inspect the inspection object going transported from the production line or the like.

請求項4のように、二つの永久磁石を筒状の磁性金属部材の外径位置に対向させて臨ませるとともに走査方向と直交するように配置させたものとすることにより、永久磁石による磁性金属部材への吸引力をより大きくすることができ、筒状の磁性金属部材を確実に検知して検出精度を向上させることができる。 As in claim 4, by which it is assumed that was arranged perpendicular to the scanning direction together to face to face the two permanent magnets on the outer diameter position of the cylindrical magnetic metal member, a magnetic metal by the permanent magnet make it possible to increase the suction force of the member can be improved reliably detected by the detection accuracy of the cylindrical magnetic metal member.

請求項5のように、永久磁石の極性を異なせることにより、磁束はループ状となり永久磁石の吸着力は強くなり検出精度を高めることができる。 As in claim 5, by different polarities of the permanent magnets, the magnetic flux attracting force of the permanent magnet becomes looped can increase the detection accuracy becomes stronger.

次に、図1、2に示されるアルミダイカスト成形されたエンジンブロックにインサートされる磁性金属部材よりなるシリンダライナの欠落を検出する装置に基づいて本発明の好ましい実施の形態を詳細に説明する。 Next, the preferred embodiments of the present invention will be described in detail with reference to apparatus for detecting a missing of the cylinder liner made of a magnetic metal member which is inserted into an aluminum die-cast molded engine block shown in FIGS.
図1中、1は検査装置であり、該検査装置1はベース2に取り付けられる荷重計3と、該荷重計3の着力点を下面に当接させてベース2に取り付けられる軸受に基端を枢軸により枢着させたブラケット4と、該ブラケット4の先端に取り付けられる左右一対の永久磁石5とからなるもので、永久磁石5が磁性金属部材11により吸引されると、該吸引力に応じてブラケット4は下方に枢動することとなり、ブラケット4に加えられる下方への枢動力はブラケット4の下面を受ける荷重計3により直接検出されることとなる。 In Figure 1, 1 is an inspection apparatus, a load meter 3 the testing device 1 is mounted on the base 2, the base end bearing attached 該荷 heavy gauge 3 applied point of the base 2 is brought into contact with the lower surface a bracket 4 which is pivotally mounted by a pivot, made of a pair of permanent magnets 5 which are attached to the tip of the bracket 4, the permanent magnet 5 is attracted by the magnetic metal member 11, depending on the suction attraction bracket 4 becomes to be pivoted downwardly, pivoting force downward exerted on the bracket 4 so that the detected directly by the load meter 3 for receiving the lower surface of the bracket 4. また、永久磁石5は被検査体10と一定距離離隔され、且つ筒状の磁性金属部材11の外径位置に対向させて臨ませるとともに走査方向と直交するように配置されている。 The permanent magnets 5 are fixed distance apart from the object to be inspected 10, it is arranged so as to be orthogonal to the scanning direction together to face to and to face the outer diameter position of the cylindrical magnetic metal member 11. さらに、対向する二つの永久磁石5は極性を逆に異ならせて、磁性金属部材11を介して磁束がループ状に形成されるようにしている。 Furthermore, two permanent magnets 5 facing the with different polarities reversed, the magnetic flux through the magnetic metal member 11 is to be formed in a loop shape. このように磁束をループ状にすることにより永久磁石5の吸着力が増して磁性金属部材11の検出精度を高めることができる。 Thus increasing suction force of the permanent magnet 5 by the magnetic flux in a loop it is possible to improve the detection accuracy of the magnetic metal member 11. なお、6はブラケット4に生じる振動を吸収するばねであり、該ばね6により振動を吸収することにより検出精度の低下を防止するものとしているが、検査装置1を上向きとして配置させる場合にはブラケット4が重力で垂れ下がらないように吊下げるばね6が必須となることはいうまでもない。 Incidentally, 6 is a spring that absorbs vibration generated in the bracket 4, but it is assumed to prevent deterioration in detection accuracy by absorbing the vibration by the spring 6, the case of arranging the inspection apparatus 1 as an upward bracket 4 it is obvious that is hanging lower spring 6 is required to prevent sag by gravity. また、基端をベース2に枢着させた前記ブラケット4は、ブラケット4の下面に配置される荷重計3の位置を調整することにより検出精度を変更することができる。 Further, the bracket 4 is pivoted to the base end to the base 2 can change the detection accuracy by adjusting the position of the load meter 3 is disposed on the lower surface of the bracket 4.

前記被検査体10はアルミ製のエンジンブロックとして60〜80kgの重量があるので永久磁石5の吸着力により浮動されることはなく、ブラケット4に取り付けられる永久磁石5が吸引されるようになっている。 The test subject 10 is not being floating by suction force of the permanent magnet 5 because of the weight of 60~80kg as aluminum engine block, so permanent magnets 5 attached to the bracket 4 is sucked there. また、該エンジンブロックはコンベア等により次工程へ搬送される間に検査されて磁性金属部材11としてのシリンダライナの欠落が検出されるものとしている。 Further, the engine block is missing cylinder liner as a magnetic metal member 11 is inspected while being transported by a conveyor or the like to the next step is assumed to be detected. 磁性金属部材11としてのシリンダライナは図3に示されるようにアルミ製のエンジンブロックにインサートされるものである。 A cylinder liner as the magnetic metal member 11 is intended to be inserted into an aluminum engine block as shown in FIG. このような筒状のシリンダライナの欠落を検出するため永久磁石5は図3に示されるようにシリンダライナの対向する外径位置に2個対向配置させたものとし、検出値が明確なピークとして表れるようにしてシリンダライナの欠落判定をより確実に行えるようにしているが、外径位置に1個だけ配置するものとしてもよいことはいうまでもない。 The permanent magnet 5 for detecting the loss of such tubular cylinder liner and those obtained by two opposed outside diameter position facing the cylinder liner, as shown in FIG. 3, the detection value as a distinct peak although the missing determination of the cylinder liner so as to appear more reliably performed as also it is needless to say it as being disposed only one outside diameter position.

図3に示されるように2気筒目のシリンダライナが欠落したエンジンブロックを用いて静特性を実験した結果、図5に示されるようなデータが得られ、2番目の気筒位置の測定荷重がゼロであることから2気筒目のシリンダライナの欠落を検出できることが確認できた。 As a result of experiments static characteristics by using the missing engine block 2 cylinder second cylinder liner, as shown in FIG. 3, obtained data as shown in FIG. 5, measuring load of the second cylinder position zero it was confirmed that it was possible to detect lost two-cylinder second cylinder liner since it is. また、図3におけるシリンダボア内に記入された1〜4の数字は気筒番号を示すものである。 Also, 1-4 digits entered in the cylinder bore in Fig. 3 shows a cylinder number. また、図5のグラフに示される丸枠内の1〜4の数字は各気筒位置を示すものである。 Also, 1-4 numbers round frame shown in the graph of FIG. 5 shows each cylinder position.

これらの実験から、磁性金属部材11の欠落判定は荷重計3からのピーク出力電圧がエンジンの気筒数分出力されればOKとなるOK方式と、出力電圧がピークの1/2となった場合、測定開始点より第1の気筒が配設されている距離までの間にピークがない場合、測定終了点前より最後の気筒が配設されている距離までにピークがない場合等にNGとするNG方式をとることができるという知見を得た。 From these experiments, the missing determination of the magnetic metal member 11 and the OK system peak output voltage from the load cell 3 becomes OK if output number of cylinders of the engine, when the output voltage becomes 1/2 of the peak when the first cylinder from the measurement starting point there is no peak between a distance that is disposed, and NG in a distance of the end of the cylinder from the measurement end temae is disposed or when there is no peak to obtain a finding that the NG method can take that.

このように構成されたものは、アルミダイカスト成形されて磁性金属部材11としてのシリンダライナがインサートされた被検査体10としてのエンジンブロックを次工程に搬送される際、図1、2に示されるように検査装置1の左右一対の永久磁石5の下方を通過させれば、左右一対の永久磁石5により磁性金属部材11よりなるシリンダライナは吸着されることとなる。 Thus those configurations, when being aluminum die casting is a cylinder liner of a magnetic metal member 11 is conveyed engine block as an object to be inspected 10 that is inserted into the next step, shown in Figure 1 and 2 if it caused to pass below the pair of permanent magnets 5 of the inspection device 1 as a cylinder liner made of a magnetic metal member 11 by a pair of left and right permanent magnets 5 so that the adsorbed.

被検査体10としてのエンジンブロックは重量があり永久磁石5の吸着力により浮動することがないので、永久磁石5は逆に磁性金属部材11に引き寄せられようとする。 Since no floats by suction force of the engine block is a permanent magnet 5 weighs as an object to be inspected 10, the permanent magnet 5 is about to be attracted to the magnetic metal member 11 in the opposite. この吸引力はブラケット4を介して荷重計3に直接伝達されることとなる。 The attraction force becomes to be transmitted directly to the load meter 3 via a bracket 4. そして、荷重計3に加えられるブラケット4の押圧力に応じて荷重計3は図4示されるような電圧を出力することとなる。 And, so that the load meter 3 for outputting a voltage as shown in Figure 4 in response to the pressing force of the bracket 4 to be applied to the load cell 3. 図4においてエンジンブロックの全長を走査する時間は約1.5秒としているが、この走査時間はコンベアの搬送速度により決まることはいうまでもない。 The time to scan the entire length of the engine block 4 is set to about 1.5 seconds, the scanning time is naturally determined by the conveying speed of the conveyor.

4気筒エンジンではシリンダライナは4つあるから、荷重計3から出力される電圧のピークは4個所となり、4つのシリンダライナがインサートされていることが判定できることとなる。 Since the cylinder liner is four in four-cylinder engine, the peak of the voltage output from the load cell 3 becomes 4 points, four cylinder liner is able to determine that are insert. もし、シリンダライナが欠落していれば図5(荷重を表示)に示されるようにピークは4箇所より少なくなるのでシリンダライナの欠落を判定できることとなる。 If the ability to determine the loss of the cylinder liner since the peak as shown in if the cylinder liner is missing 5 (Display load) is less than 4 points.

なお、前記好ましい実施の形態では、被検査体10をエンジンブロックとして永久磁石5の吸着力では浮動しない重さを有しているが、被検査体10がプラスチックスように軽量で永久磁石5の吸着力で浮動するものの場合、被検査体10を固定物等に係止させて浮動しないようにすることはいうまでもない。 Incidentally, in the preferred embodiment, has a weight which does not float in the adsorption force of the permanent magnet 5 of the inspection object 10 as the engine block, the inspection object 10 is a permanent magnet 5 in lightweight plastics so for those floating in the adsorption force, it goes without saying that to not float out to engage with the stationary object like the object to be tested 10.

本発明の好ましい実施の形態を示す一部切欠正面図である。 It is a partially cutaway front view showing a preferred embodiment of the present invention. 本発明の好ましい実施の形態を示す一部切欠側面図である。 It is a partially cutaway side view of a preferred embodiment of the present invention. エンジンブロック上を永久磁石が走査する状態を示す説明図である。 It is an explanatory view showing a state in which scanning on the engine block permanent magnet. シリンダライナの欠落のない4気筒のエンジンブロックを約1.5秒で走査した際、荷重計より出力される電圧を示すグラフである。 When scanning the engine block of the missing without 4-cylinder of the cylinder liner in about 1.5 seconds, it is a graph showing the voltage output from the load cell. 2気筒目のシリンダライナが欠落したエンジンブロックを始端から終端まで走査した際、荷重計が検出した荷重値を示すグラフである。 When the engine block 2 cylinders th cylinder liner is missing was scanned from the beginning to the end is a graph showing a load value load meter has detected.

符号の説明 DESCRIPTION OF SYMBOLS

3 荷重計 5 永久磁石 3 load a total of five permanent magnet
10 被検査体 10 object to be tested
11 磁性金属部材 11 magnetic metal member

Claims (5)

  1. 永久磁石の吸着力により浮動することのない被検査体の磁性金属部材が該被検査体と一定距離離隔させて配置される永久磁石を吸引し、該永久磁石が吸引される力を荷重計に伝達して磁性金属部材の欠落を検知することを特徴とする磁性金属部材の欠落検出方法。 Aspirating a permanent magnet magnetic metal member of the inspection object not to float the suction force of the permanent magnets are arranged with a predetermined distance apart from the obtaining step body, the force which the permanent magnets is attracted to the load cell loss detecting method of the magnetic metal member, characterized in that transmission to detect the missing of the magnetic metal member.
  2. 永久磁石の吸着力により浮動することがない被検査体と一定距離離隔されて配置される永久磁石と、被検査体の磁性金属部材に吸引されることによって永久磁石に加えられる力を直接検出する荷重計とからなることを特徴とする磁性金属部材の欠落検出装置。 A permanent magnet device under test not to float the suction force of the permanent magnet and is arranged for a certain distance apart, for detecting the force applied to the permanent magnet by being attracted to the magnetic metal member of the device under test directly loss detecting unit of the magnetic metal member characterized by comprising a load cell.
  3. 永久磁石と被検査体が相対的に移動されて走査が行われる請求項2に記載の磁性金属部材の欠落検出装置。 Loss detecting unit of the magnetic metal member according to claim 2, permanent magnet and the object to be inspected is scanned it is relative movement is performed.
  4. 二つの永久磁石を筒状の磁性金属部材の外径位置に対向させて臨ませるとともに走査方向と直交するように配置させたことを特徴とする請求項2または3に記載の磁性金属部材の欠落検出装置。 Missing magnetic metal member according to claim 2 or 3, characterized in that is arranged perpendicular to the scanning direction along with to face to face the two permanent magnets on the outer diameter position of the cylindrical magnetic metal member detection device.
  5. 永久磁石の極性を異なせたことを特徴とする請求項4に記載の磁性金属部材の欠落検出装置。 Loss detecting unit of the magnetic metal member according to claim 4, characterized in that it was different polarities of the permanent magnets.
JP2006006208A 2006-01-13 2006-01-13 Loss detecting method and apparatus of the magnetic metal member Expired - Fee Related JP4412670B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009103591A (en) * 2007-10-24 2009-05-14 Ryoei Engineering Kk Method of detecting defects in magnetic metal cylindrical body, and device thereof
JP4493727B1 (en) * 2009-11-10 2010-06-30 中村 孝行 Measurement or inspection method and head thickness inspection tool head thickness of the concrete in reinforced concrete structures
JP2011099827A (en) * 2009-11-09 2011-05-19 Shinko Sensor:Kk Weight measuring device of article on conveyor
JP2011163792A (en) * 2010-02-05 2011-08-25 Honda Motor Co Ltd Inspection apparatus equipped with magnetic material detection

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009103591A (en) * 2007-10-24 2009-05-14 Ryoei Engineering Kk Method of detecting defects in magnetic metal cylindrical body, and device thereof
JP2011099827A (en) * 2009-11-09 2011-05-19 Shinko Sensor:Kk Weight measuring device of article on conveyor
JP4493727B1 (en) * 2009-11-10 2010-06-30 中村 孝行 Measurement or inspection method and head thickness inspection tool head thickness of the concrete in reinforced concrete structures
JP2011102743A (en) * 2009-11-10 2011-05-26 Tetsuaki Akita Method for measuring or inspecting covering thickness of concrete in reinforced concrete structure, and covering thickness inspection instrument
JP2011163792A (en) * 2010-02-05 2011-08-25 Honda Motor Co Ltd Inspection apparatus equipped with magnetic material detection

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