JP2005114403A - Strain measuring instrument - Google Patents

Strain measuring instrument Download PDF

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JP2005114403A
JP2005114403A JP2003345629A JP2003345629A JP2005114403A JP 2005114403 A JP2005114403 A JP 2005114403A JP 2003345629 A JP2003345629 A JP 2003345629A JP 2003345629 A JP2003345629 A JP 2003345629A JP 2005114403 A JP2005114403 A JP 2005114403A
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strain
holding member
pressing
press
contact
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Tatsuya Koshio
達也 小塩
Masazo Shiina
政三 椎名
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Tokyo Sokki Kenkyujo Co Ltd
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Tokyo Sokki Kenkyujo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a strain measuring instrument capable of measuring strain or stress without bonding a strain gage onto a measuring object, and capable of carrying out measuring work easily without requiring great labor for a worker irrespective of the number of measuring points. <P>SOLUTION: This strain measuring instrument comprises a press-contact member 2 having a press-contact face 8 brought into press contact with the strain gage 17; a holding member 1 for holding the press-contact member 2 to be movable along a normal direction of the press-contact face 8; an elastic member 16 for energizing the press-contact member 2 toward a direction projected from an opening end part of the holding member 1; and a magnet 3 for attracting the holding member 1 onto the measuring object W comprising a magnetic substance, when the holding member 1 is moved to be approached to the measuring object W under the condition where the strain gage 17 is interposed between the measuring object W and the press-contact face 8. Energizing force of the elastic member 16 is imparted to the central part of the press-contact member 2 via a sphere 11. The strain gage 17 is bonded onto the press-contact face 8 formed of a rubber material 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明をひずみゲージを用いてひずみ又は応力の測定を行う測定器に関する。   The present invention relates to a measuring instrument for measuring strain or stress using a strain gauge.

従来より、種々様々の構造物のひずみ又は応力を測定するためにひずみゲージ（抵抗式ひずみゲージ）が用いられている。この測定においては、ひずみゲージを接着剤により測定対象物の所望の測定箇所に接着した後、該ひずみゲージの抵抗値変化をホイートストンブリッジ回路等を用いて検出し、その抵抗値変化に基づいてひずみ又は応力を測定することが一般に行われる。   Conventionally, strain gauges (resistance strain gauges) have been used to measure the strain or stress of various structures. In this measurement, after a strain gauge is bonded to a desired measurement location of an object to be measured with an adhesive, a change in the resistance value of the strain gauge is detected using a Wheatstone bridge circuit or the like, and a strain is detected based on the change in resistance value. Or it is common to measure stress.

ところが、上記のようにひずみゲージを接着剤により測定対象物に接着する測定手法では、ひずみゲージを測定箇所に接着する作業だけでなく、測定前に測定対象物の測定箇所から塗膜を除去する作業、接着したひずみゲージをコーティングする作業、測定後にひずみゲージを剥がす作業、測定箇所の塗膜の修復を行う作業等、測定に付随する作業が多くなる。また、ひずみゲージを測定対象物に接着する接着剤が硬化するまで、測定を開始することができないと共に、ひずみゲージを測定対象物に適切に接着するためには、熟練した作業技術も要する。   However, in the measurement method in which the strain gauge is bonded to the measurement object with an adhesive as described above, the coating film is removed not only from the work of bonding the strain gauge to the measurement position but also from the measurement position of the measurement object before the measurement. There are many operations associated with the measurement, such as an operation, an operation of coating the adhered strain gauge, an operation of removing the strain gauge after the measurement, and an operation of repairing the coating film at the measurement location. In addition, measurement cannot be started until the adhesive that bonds the strain gauge to the measurement object is cured, and skilled work techniques are required to appropriately bond the strain gauge to the measurement object.

このため、ひずみゲージを測定対象物に接着することなく、簡易に測定を行うことができるひずみ測定器が望まれる場合も多々ある。このようなひずみ測定器としては、従来、例えば特公昭３５−１７１８６号公報（特許文献１）に見られるものが知られている。この特許文献１のひずみ測定器は、ひずみゲージをゴムブロックを介して手作業で測定対象物に押し当て、その状態で、ひずみゲージの抵抗値変化を検出して、ひずみ又は応力を測定するようにしたものである。このひずみ測定器によれば、ひずみゲージを接着剤により測定対象物に接着することなく、簡易にひずみ又は応力の測定を行うことができる。   For this reason, there are many cases where a strain measuring instrument that can easily perform the measurement without adhering the strain gauge to the measurement object is desired. As such a strain measuring device, what is conventionally seen, for example in Japanese Patent Publication No. 35-17186 (patent document 1) is known. The strain measuring instrument disclosed in Patent Document 1 presses a strain gauge against an object to be measured manually through a rubber block, and in that state, detects a change in resistance value of the strain gauge and measures strain or stress. It is a thing. According to this strain measuring instrument, it is possible to easily measure strain or stress without adhering a strain gauge to an object to be measured with an adhesive.

しかしながら、特許文献１のひずみ測定器では、測定中に作業者が手作業でひずみゲージをゴムブロックを固定した掴み部分を測定対象物側に向かって押し付け続けなければならない。このため、作業者の継続的な力作業が必要となる。また、作業者による押し付け力が弱過ぎる場合もあり、このような場合には、ひずみゲージと測定対象物との密着性が損なわれて、精度のよい測定を行うことができない。さらに、複数の測定箇所での測定を行う場合には、作業者がひずみゲージを各測定箇所にゴムブロックを介して押し付ける作業を各測定箇所毎に順番に行わなければならない。このため、特に測定箇所が多い多点測定では、多大の労力と時間を必要とすることとなり、多点測定を行うことは実質的に困難であった。
特公昭３５−１７１８６号公報 However, in the strain measuring instrument disclosed in Patent Document 1, the operator must continue to press the grip portion, to which the rubber gauge is fixed, the strain gauge toward the object to be measured during measurement. For this reason, an operator's continuous power work is required. In addition, the pressing force by the operator may be too weak. In such a case, the adhesion between the strain gauge and the measurement object is impaired, and accurate measurement cannot be performed. Furthermore, when performing measurement at a plurality of measurement locations, the operator must perform the operation of pressing the strain gauge against each measurement location via a rubber block in order for each measurement location. For this reason, especially in multipoint measurement with many measurement locations, much labor and time are required, and it was practically difficult to perform multipoint measurement.
Japanese Patent Publication No. 35-17186

本発明はかかる背景に鑑みてなされたものであり、ひずみゲージを測定対象物に接着することなくひずみ又は応力の測定を行うことができると共に、測定箇所の多少によらずに作業者の労力を多大に要することなく容易に測定作業を行うことができるひずみ測定器を提供することを目的とする。   The present invention has been made in view of such a background, and can measure strain or stress without adhering a strain gauge to an object to be measured, and can reduce the labor of an operator regardless of the number of measurement points. An object of the present invention is to provide a strain measuring instrument that can easily perform a measuring operation without requiring much.

本発明のひずみ測定器は、鉄系金属等の磁性材からなる測定対象物のひずみ又は応力をひずみゲージにより測定するものである。そして、本発明のひずみ測定器は、前記測定対象物に裏面を接触させたひずみゲージの表面に押し当てる押し当て面を有する押し当て部材と、該押し当て部材の外周囲を囲む側壁を有し、該押し当て部材をその押し当て面の略法線方向に移動可能に保持する保持部材と、該保持部材の一端から前記押し当て部材が突出する方向に該押し当て部材を付勢する弾性部材と、前記測定対象物にひずみゲージの裏面を接触させると共に該ひずみゲージの表面に前記押し当て部材の押し当て面を当接させた状態で前記保持部材を前記弾性部材の付勢力に抗してその一端が前記測定対象物に近づくように移動させたとき、該保持部材を磁力により該測定対象物に吸着させるように該保持部材と一体に設けられた磁石とを備えたことを特徴とするものである。   The strain measuring instrument of the present invention measures strain or stress of a measuring object made of a magnetic material such as iron-based metal with a strain gauge. The strain measuring instrument of the present invention includes a pressing member having a pressing surface that presses against the surface of the strain gauge whose back surface is in contact with the measurement object, and a side wall that surrounds the outer periphery of the pressing member. A holding member that holds the pressing member movably in a direction substantially normal to the pressing surface, and an elastic member that urges the pressing member in a direction in which the pressing member protrudes from one end of the holding member. And the back surface of the strain gauge is brought into contact with the object to be measured and the holding member is resisted against the biasing force of the elastic member in a state where the pressing surface of the pressing member is in contact with the surface of the strain gauge. And a magnet integrally provided with the holding member so that the holding member is attracted to the measurement object by a magnetic force when one end thereof is moved so as to approach the measurement object. Is a thing

かかる本発明によれば、測定に際しては、測定対象物にひずみゲージの裏面を接触させると共に該ひずみゲージの表面に前記押し当て部材の押し当て面を当接させた状態で前記保持部材を前記弾性部材の付勢力に抗してその一端が前記測定対象物に近づくように移動させる。これにより、ひずみゲージが測定対象物と押し当て部材との間に挟持されるようにして、押し当て部材の押し当て面がひずみゲージの表面に測定対象物に向かって押し付けられ、該ひずみゲージが測定対象物に密着する（圧接される）。このとき、該保持部材と一体に設けられた磁石と測定対象物との間に作用する磁力によって保持部材が測定対象物に吸着される。このため、その吸着後は、ひずみゲージが測定対象物に弾性部材の付勢力によって密着した状態に維持される。この場合、作業者は、保持部材が測定対象物に磁石によって吸着されるまで、保持部材を測定対象物に近づくように移動させた後は、保持部材を測定対象物側に押しつける作業を解除しても、ひずみゲージが測定対象物に密着した状態に維持される。したがって、その後は、保持部材を把持しておく必要はない。そして、この状態で、ひずみゲージの抵抗値変化を検出することで、測定対象物のひずみ又は応力の測定を支障なく行うことができる。   According to the present invention, at the time of measurement, the elastic member is placed in a state where the back surface of the strain gauge is brought into contact with the measurement object and the pressing surface of the pressing member is in contact with the surface of the strain gauge. The member is moved so that one end thereof approaches the measurement object against the biasing force of the member. Thus, the pressing surface of the pressing member is pressed against the surface of the strain gauge so that the strain gauge is sandwiched between the measuring object and the pressing member, and the strain gauge is Adheres closely to the object to be measured. At this time, the holding member is attracted to the measurement object by the magnetic force acting between the magnet provided integrally with the holding member and the measurement object. For this reason, after the adsorption, the strain gauge is maintained in close contact with the measurement object by the biasing force of the elastic member. In this case, the operator releases the operation of pressing the holding member against the measurement object side after moving the holding member closer to the measurement object until the holding member is attracted to the measurement object by the magnet. Even so, the strain gauge is maintained in close contact with the object to be measured. Therefore, after that, it is not necessary to hold the holding member. In this state, by detecting a change in the resistance value of the strain gauge, it is possible to measure the strain or stress of the measurement object without hindrance.

したがって、本発明によれば、ひずみゲージを測定対象物に接着することなくひずみ又は応力の測定を行うことができる他、保持部材を磁石により測定対象物に吸着させる作業を作業者が行うだけで、ひずみ又は応力の測定を行うことができる状態になるので、測定作業を容易に行うことができる。また、測定中に作業者が保持部材を把持しておく必要が無いため、測定対象物のひずみ又は応力の多点測定を行う場合には、本発明のひずみ測定器を複数用意して、それらのひずみ測定器の保持部材を測定対象物の各測定箇所に吸着して保持させる作業を行うことで、容易に多点測定を行うことができる。   Therefore, according to the present invention, the strain or stress can be measured without adhering the strain gauge to the measurement object, and the operator only needs to perform the work of attracting the holding member to the measurement object by the magnet. Since the strain or stress can be measured, the measurement work can be easily performed. In addition, since it is not necessary for the operator to hold the holding member during measurement, when performing multipoint measurement of strain or stress of the measurement object, prepare a plurality of strain measuring instruments of the present invention. Multi-point measurement can be easily performed by performing an operation of adsorbing and holding the holding member of the strain measuring instrument at each measurement location of the measurement object.

なお、本発明のひずみ測定器で、保持部材を磁石により測定対象物に吸着させるためには、該測定対象物が磁性材からなることが必要となるが、ひずみ又は応力の測定対象とする物体は多くの場合、磁性材から成るので、本発明のひずみ測定器は、多くの測定対象物に適用できる。   In the strain measuring instrument of the present invention, in order for the holding member to be attracted to the object to be measured by the magnet, the object to be measured needs to be made of a magnetic material, but the object to be measured for strain or stress. Is often made of a magnetic material, the strain measuring device of the present invention can be applied to many measuring objects.

かかる本発明では、前記押し当て部材の、前記押し当て面と反対側の面部の中央部に球体を当接させ、前記弾性部材により該球体を介して前記押し当て部材を付勢するようにすることが好ましい。   In the present invention, a sphere is brought into contact with the central portion of the surface of the pressing member opposite to the pressing surface, and the pressing member is urged through the sphere by the elastic member. It is preferable.

これによれば、弾性部材の付勢力を、押し当て部材の、前記押し当て面と反対側の面部の中央部に球体を介して加えることができるので、該押し当て部材と測定対象物との間のひずみゲージに偏荷重が作用して、該ひずみゲージの位置ずれが生じたり、測定対象物へのひずみゲージの部分的な密着性が損なわれたりするのを防止できる。したがって、ひずみ又は応力の測定の信頼性を高めることができる。   According to this, the urging force of the elastic member can be applied to the central portion of the surface portion of the pressing member opposite to the pressing surface via the sphere, so that the pressing member and the measurement object It is possible to prevent the strain gauge from being displaced due to an unbalanced load acting on the strain gauge in the meantime, or the partial adhesion of the strain gauge to the measurement object from being impaired. Therefore, the reliability of strain or stress measurement can be improved.

なお、本発明では、押し当て部材の押し当て面にひずみゲージをあらかじめ接着しておくことが好ましい。また、押し当て部材の押し当て面を板状のゴム材により形成しておくことが好ましい。   In the present invention, it is preferable that a strain gauge is bonded in advance to the pressing surface of the pressing member. Moreover, it is preferable to form the pressing surface of the pressing member with a plate-shaped rubber material.

本発明の一実施形態を図１および図２を参照して説明する。図１は本実施形態のひぞみ測定器の縦断面図であり、図２は該ひずみゲージの動作説明図である。図１を参照して、１は有底筒状の保持部材、２は押し当て部材である。保持部材１の開口端部側（図では下端部側）の端面には、環状の磁石３を収容した環状の磁石ケース４が保持部材１と同心に固着され、該磁石ケース４および磁石３の中心部の貫通穴５が保持部材１の内部に連通している。磁石ケース４および磁石３の内径（貫通穴５の径）は、保持部材１の内径よりも小径であり、磁石ケース４および磁石３の内周縁部は保持部材１の軸心側に張り出している。   An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of a strain measuring instrument of the present embodiment, and FIG. 2 is an operation explanatory view of the strain gauge. With reference to FIG. 1, 1 is a bottomed cylindrical holding member, and 2 is a pressing member. An annular magnet case 4 containing an annular magnet 3 is fixed to the end surface of the holding member 1 on the opening end side (the lower end side in the figure) concentrically with the holding member 1. A central through hole 5 communicates with the inside of the holding member 1. The inner diameters of the magnet case 4 and the magnet 3 (the diameter of the through hole 5) are smaller than the inner diameter of the holding member 1, and the inner peripheral edge portions of the magnet case 4 and the magnet 3 project to the axial center side of the holding member 1. .

押し当て部材２は、金属等の剛体から円柱状の形成された基体ブロック６と、この基体ブロック６の一端面（図では下端面）にそのほぼ全面にわたって固着された円板状のゴム材７とから構成され、このゴム材７の表面（図では下面）が押し当て面８となっている。この押し当て部材２の基体ブロック６は、その軸心を保持部材１の軸心方向に向けて前記貫通穴５に挿入され、その軸心方向（押し当て面８の法線方向）に移動可能に設けられている。押し当て部材２の、前記押し当て面８と反対側の端部（図では上端部）は、貫通穴５から保持部材１の内部空間に突出しており、その保持部材１内の部分（押し当て部材２の基体ブロック６の上端部）の外周には、径方向外方に張り出したフランジ９が基体ブロック６と一体に形成されている。このフランジ９は、図１の如く、押し当て部材２の押し当て面８を含む下端部が保持部材１の開口端部の貫通穴５から外部に突出した状態で前記磁石ケース４の内周縁部（保持部材１の軸心側に張り出した部分）に当接して係止される。   The pressing member 2 includes a base block 6 formed in a cylindrical shape from a rigid body such as a metal, and a disk-shaped rubber member 7 fixed to one end face (lower end face in the drawing) of the base block 6 over almost the entire surface. The surface (lower surface in the figure) of the rubber material 7 is a pressing surface 8. The base block 6 of the pressing member 2 is inserted into the through hole 5 with its axis oriented in the axial direction of the holding member 1 and can move in the axial direction (normal direction of the pressing surface 8). Is provided. An end portion (upper end portion in the drawing) of the pressing member 2 opposite to the pressing surface 8 protrudes from the through hole 5 into the internal space of the holding member 1, and a portion in the holding member 1 (pressing portion) On the outer periphery of the upper end portion of the base block 6 of the member 2, a flange 9 projecting radially outward is formed integrally with the base block 6. As shown in FIG. 1, the flange 9 has an inner peripheral edge portion of the magnet case 4 in a state in which a lower end portion including the pressing surface 8 of the pressing member 2 protrudes from the through hole 5 at the opening end portion of the holding member 1. It is brought into contact with and locked to (the portion of the holding member 1 that protrudes toward the axial center).

押し当て部材２の基体ブロック６の上端面部（保持部材１の内部側の端面部）の中央箇所には凹部１０が形成されており、この凹部１０内に球体１１が収容されている。この球体１１は、凹部１０の底面の中央部に形成された浅い球面溝１２に下端部が当接されて支承されている。また、球体１２の上側には、筒状のバネ座部材１３が軸心を上下方向（保持部材１の軸心と同方向）に向けて配置されており、このバネ座部材１３の貫通孔１４の下端周縁が球体１２に当接されている。そして、バネ座部材１３の下端部外周に形成されたフランジ１５と、保持部材１の底面（図では上端の天板面）との間で弾性部材であるスプリング１６が若干圧縮された状態で介装されている。したがって、スプリング１６は、バネ座部材１３および球体１１を介して押し当て部材２を下方、すなわち、押し当て面８が保持部材１の開口端部の貫通穴５から突出する方向に付勢している。   A concave portion 10 is formed at the central portion of the upper end surface portion (end surface portion on the inner side of the holding member 1) of the base block 6 of the pressing member 2, and the sphere 11 is accommodated in the concave portion 10. The spherical body 11 is supported with its lower end in contact with a shallow spherical groove 12 formed at the center of the bottom surface of the recess 10. Further, on the upper side of the sphere 12, a cylindrical spring seat member 13 is arranged with its axis oriented in the vertical direction (the same direction as the axis of the holding member 1), and the through hole 14 of this spring seat member 13 is arranged. The lower peripheral edge of is in contact with the sphere 12. The spring 16 as an elastic member is slightly compressed between the flange 15 formed on the outer periphery of the lower end portion of the spring seat member 13 and the bottom surface of the holding member 1 (the top plate surface at the upper end in the figure). It is disguised. Therefore, the spring 16 urges the pressing member 2 downward through the spring seat member 13 and the sphere 11, that is, in a direction in which the pressing surface 8 protrudes from the through hole 5 at the opening end of the holding member 1. Yes.

押し当て部材２の押し当て面８（ゴム材７の下面）の中央箇所には、ひずみゲージ１７の表面（図では上面）がその法線方向を押し当て部材２の可動方向（押し当て部材２の軸心方向）に向けて接着剤（図示省略）を介して固着されている。該ひずみゲージ１７は公知のものであり、詳細な図示は省略するが、樹脂製のゲージベース上に銅・ニッケル合金等の細い抵抗線あるいは薄膜を固着したものである。そして、このひずみゲージ１７から導出されたリード線１８が押し当て部材２のゴム材７および基体ブロック６にあらかじめ穿設された貫通孔１９を通して保持部材１の内部に導入され、さらに保持部材１の側壁に穿設された貫通孔２０を介して外部に導出されている。   At the central portion of the pressing surface 8 of the pressing member 2 (the lower surface of the rubber material 7), the surface of the strain gauge 17 (the upper surface in the figure) has its normal direction as the movable direction of the pressing member 2 (the pressing member 2). Are fixed to each other via an adhesive (not shown). The strain gauge 17 is a well-known one, and although detailed illustration is omitted, a thin resistance wire or thin film such as a copper / nickel alloy is fixed on a resin gauge base. Then, the lead wire 18 led out from the strain gauge 17 is introduced into the holding member 1 through the rubber material 7 of the pressing member 2 and the through-hole 19 previously drilled in the base block 6. It is led out through a through hole 20 formed in the side wall.

次に、かかる本実施形態のひずみ測定器による測定を行う手法を説明する。まず、作業者が保持部材１を把持した状態で、図１に示すように、鉄系材質などの磁性材からなる測定対象物Ｗに対し、そのひずみ又は応力を測定しようとする箇所にひずみゲージ１の裏面（図の下面）を接触させる。そして、この状態で保持部材１の開口端部を測定対象物Ｗに近づけるように該保持部材１を測定対象物Ｗに向かって押圧する。このとき、保持部材１の開口端部の磁石３が測定対象物Ｗにある程度近づくと、磁石３と測定対象物Ｗとの間に作用する磁力によって、該磁石３の下面（測定対象物Ｗ側端面）が測定対象物Ｗに吸着する。すなわち、図２に示す如く、保持部材１が磁石３を介して測定対象物Ｗに吸着された状態に保持される。なお、この状態では、作業者は、保持部材１の押圧を解除しても、保持部材１と測定対象物Ｗとの吸着状態は維持される。   Next, a method for performing measurement using the strain measuring instrument of the present embodiment will be described. First, as shown in FIG. 1, with the operator holding the holding member 1, a strain gauge is placed on a measurement object W made of a magnetic material such as an iron-based material at a location where strain or stress is to be measured. The back surface of 1 (the lower surface in the figure) is brought into contact. In this state, the holding member 1 is pressed toward the measurement object W so that the opening end of the holding member 1 approaches the measurement object W. At this time, when the magnet 3 at the opening end of the holding member 1 approaches the measurement object W to some extent, the lower surface of the magnet 3 (measurement object W side) is generated by the magnetic force acting between the magnet 3 and the measurement object W. The end face is adsorbed to the measuring object W. That is, as shown in FIG. 2, the holding member 1 is held in a state of being attracted to the measurement object W via the magnet 3. In this state, even if the operator releases the pressing of the holding member 1, the suction state between the holding member 1 and the measurement target W is maintained.

一方、このとき、押し当て部材２がスプリング１６の付勢力に抗して保持部材１に対して上動して、スプリング１６が圧縮される。このため、図２に示す如く、前記ひずみゲージ１７は、押し当て部材２と測定対象物Ｗとの間に挟持されるようにして、測定対象物Ｗに圧接されて密着する。この場合、ひずみゲージ１７を測定対象物Ｗに圧接させる力は、スプリング１６から球体１１を介して押し当て部材２の凹部１０の底面の中央部に作用し、また、押し当て部材２の基体ブロック６が剛体状のものであるため、ひずみゲージ１７に偏荷重が作用したりすることなく、均一的に測定対象物Ｗに圧接される。したがって、測定対象物Ｗとひずみゲージ１７との一体性が充分に確保される。   On the other hand, at this time, the pressing member 2 moves up against the holding member 1 against the urging force of the spring 16, and the spring 16 is compressed. For this reason, as shown in FIG. 2, the strain gauge 17 is pressed against and closely contacts the measurement object W so as to be sandwiched between the pressing member 2 and the measurement object W. In this case, the force that presses the strain gauge 17 against the measuring object W acts on the center portion of the bottom surface of the concave portion 10 of the pressing member 2 from the spring 16 via the sphere 11, and the base block of the pressing member 2. Since 6 is a rigid body, an uneven load is not applied to the strain gauge 17, and it is uniformly pressed against the measurement object W. Therefore, the integrity of the measuring object W and the strain gauge 17 is sufficiently ensured.

これにより測定対象物Ｗのひずみ又は応力の測定を行うことができる状態となる。そして、この状態で、ひずみゲージ１７のリード線１８を測定用回路装置（図示省略）に接続して、ホイートストンブリッジ回路等を介してひずみゲージ１７に通電し、その抵抗値変化を検出することで、測定対象物Ｗのひずみ又は応力の測定が行われることとなる。   Thereby, it will be in the state which can measure the distortion or the stress of the measuring object W. In this state, the lead wire 18 of the strain gauge 17 is connected to a measurement circuit device (not shown), and the strain gauge 17 is energized through a Wheatstone bridge circuit or the like to detect a change in resistance value. Then, the strain or stress of the measurement object W is measured.

かかる本実施形態のひずみ測定器によれば、作業者は、保持部材１を磁石３を介して測定対象物Ｗに吸着させる作業を行えば、その後は、ひずみゲージ１７が測定対象物Ｗに密着して圧接された状態に維持されるので、ひずみゲージ１７を測定対象物Ｗに接着する作業が不要となり、測定作業を簡単に行うことができる。また、測定中に保持部材１を作業者が押圧しつづける必要がないことから、特に測定対象物Ｗの多数の箇所のひずみ又は応力の測定を行う多点測定では、本実施形態のひずみ測定器をその測定箇所の個数分用意して、それぞれのひずみ測定器を各測定箇所に設置することで、容易に多点測定を行うことができる。さらに、測定後には、ひずみ測定器を測定対象物から離脱させれば、そのひずみ測定器を繰り返し用いて他の測定箇所のひずみ又は応力の測定を行うこともできる。   According to the strain measuring instrument of this embodiment, if the operator performs an operation of attracting the holding member 1 to the measuring object W via the magnet 3, then the strain gauge 17 is in close contact with the measuring object W. Thus, since the pressure contact state is maintained, the work of adhering the strain gauge 17 to the measurement object W becomes unnecessary, and the measurement work can be easily performed. In addition, since it is not necessary for the operator to keep pressing the holding member 1 during measurement, the strain measuring instrument according to the present embodiment is particularly suitable for multipoint measurement in which strain or stress is measured at a number of locations on the measurement target W. Is prepared for the number of measurement points, and each strain measurement device is installed at each measurement point, whereby multipoint measurement can be easily performed. Further, after the measurement, if the strain measuring instrument is detached from the measurement object, the strain or stress can be measured at other measurement locations by repeatedly using the strain measuring instrument.

なお、以上説明した実施形態では、保持部材１に、これと別体の磁石３を装着するようにしたが、保持部材１自体を磁石により構成するようにしてもよい。また、前記実施形態では、ひずみゲージ１７を押し当て部材２に接着しておくようにしたが、ひずみゲージ１７を押し当て部材２に接着せずに、それらを分離しておいてもよい。また、磁石３は電磁石により構成してもよい。さらに、スプリング１６のバネ圧を調整するためのネジ等をスプリング１６に係合しておき、必要に応じてスプリング１６のバネ圧を調整するようにしてもよい。   In the embodiment described above, the magnet 3 that is separate from the holding member 1 is attached to the holding member 1, but the holding member 1 itself may be configured by a magnet. Moreover, in the said embodiment, although the strain gauge 17 was adhere | attached on the pressing member 2, you may isolate | separate them, without adhering the strain gauge 17 to the pressing member 2. FIG. Further, the magnet 3 may be constituted by an electromagnet. Further, a screw or the like for adjusting the spring pressure of the spring 16 may be engaged with the spring 16, and the spring pressure of the spring 16 may be adjusted as necessary.

また、本発明のひずみ測定器は磁石を利用するものであるが、磁石が吸着できない測定対象物（コンクリート等）においては、本発明のひずみ測定器の磁石に代えて、吸盤を用い、あるいは、測定対象物を挟むクランプ手段（シャコ万力など）を用いることで、本発明のひずみ測定器と同様の効果を得ることが可能である。   Moreover, although the strain measuring instrument of the present invention uses a magnet, in a measurement object (concrete etc.) that the magnet cannot adsorb, a suction cup is used instead of the magnet of the strain measuring instrument of the present invention, or By using a clamping means (such as a giant clam vise) that sandwiches the measurement object, it is possible to obtain the same effect as the strain measuring instrument of the present invention.

本発明のひずみ測定器の一実施形態の縦断面図。The longitudinal cross-sectional view of one Embodiment of the distortion measuring device of this invention. 図１のひずみ測定器の作動説明図。Operation | movement explanatory drawing of the distortion measuring device of FIG.

符号の説明Explanation of symbols

１…保持部材、２…押し当て部材、３…磁石、１６…スプリング（弾性部材）、１７…ひずみゲージ、Ｗ…測定対象物。   DESCRIPTION OF SYMBOLS 1 ... Holding member, 2 ... Pushing member, 3 ... Magnet, 16 ... Spring (elastic member), 17 ... Strain gauge, W ... Measurement object.

Claims (2)

磁性材から成る測定対象物のひずみ又は応力をひずみゲージにより測定するひずみ測定器であって、
前記測定対象物に裏面を接触させたひずみゲージの表面に押し当てる押し当て面を有する押し当て部材と、該押し当て部材の外周囲を囲む側壁を有し、該押し当て部材をその押し当て面の略法線方向に移動可能に保持する保持部材と、該保持部材の一端から前記押し当て部材が突出する方向に該押し当て部材を付勢する弾性部材と、前記測定対象物にひずみゲージの裏面を接触させると共に該ひずみゲージの表面に前記押し当て部材の押し当て面を当接させた状態で前記保持部材を前記弾性部材の付勢力に抗してその一端が前記測定対象物に近づくように移動させたとき、該保持部材を磁力により該測定対象物に吸着させるように該保持部材と一体に設けられた磁石とを備えたことを特徴とするひずみ測定器。 A strain measuring instrument for measuring strain or stress of a measuring object made of a magnetic material with a strain gauge,
A pressing member having a pressing surface that presses against the surface of the strain gauge whose back surface is in contact with the measurement object, and a side wall that surrounds the outer periphery of the pressing member, and the pressing member is pressed against the pressing surface. A holding member that is movable in a substantially normal direction, an elastic member that urges the pressing member in a direction in which the pressing member protrudes from one end of the holding member, and a strain gauge on the measurement object. The holding member is opposed to the urging force of the elastic member in a state where the back surface is in contact and the pressing surface of the pressing member is in contact with the surface of the strain gauge so that one end of the holding member approaches the object to be measured. And a magnet provided integrally with the holding member so that the holding member is attracted to the measurement object by magnetic force when moved to the position. 前記押し当て部材の、前記押し当て面と反対側の面部の中央部に球体を当接させ、前記弾性部材により該球体を介して前記押し当て部材を付勢するようにしたことを特徴とする請求項１記載のひずみ測定器。   A sphere is brought into contact with a central portion of a surface portion of the pressing member opposite to the pressing surface, and the pressing member is urged through the sphere by the elastic member. The strain measuring instrument according to claim 1.
JP2003345629A 2003-10-03 2003-10-03 Strain measuring instrument Pending JP2005114403A (en)

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EP1926965B1 (en) * 2005-09-22 2016-03-09 Sensormate AG Extension sensor for electrically measuring negative and positive surface extensions
EP1926965A1 (en) 2005-09-22 2008-06-04 Sensormate AG Extension sensor for electrically measuring negative and positive surface extensions
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JP2013035231A (en) * 2011-08-09 2013-02-21 Fanuc Ltd Injection molding machine having mold clamping force detection part
EP2573535A1 (en) 2011-09-22 2013-03-27 Sumitomo Heavy Industries, Ltd. Strain sensor attachment construction and strain measurement apparatus
JP2013068552A (en) * 2011-09-22 2013-04-18 Sumitomo Heavy Ind Ltd Strain sensor attachment construction and strain measurement apparatus
CN103017649A (en) * 2011-09-22 2013-04-03 住友重机械工业株式会社 Strain sensor attachment construction and strain measurement apparatus
JP2013124910A (en) * 2011-12-14 2013-06-24 Jfe Steel Corp Distortion measuring instrument
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JP2014163670A (en) * 2013-02-21 2014-09-08 Hioki Ee Corp Noncontact voltage measurement instrument
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