JP4323568B1 - Method and device for measuring stress of bolted portion - Google Patents

Method and device for measuring stress of bolted portion Download PDF

Info

Publication number
JP4323568B1
JP4323568B1 JP2009514292A JP2009514292A JP4323568B1 JP 4323568 B1 JP4323568 B1 JP 4323568B1 JP 2009514292 A JP2009514292 A JP 2009514292A JP 2009514292 A JP2009514292 A JP 2009514292A JP 4323568 B1 JP4323568 B1 JP 4323568B1
Authority
JP
Japan
Prior art keywords
bolt
receiving body
diameter
strain sensor
pressure receiving
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.)
Active
Application number
JP2009514292A
Other languages
Japanese (ja)
Other versions
JPWO2009153881A1 (en
Inventor
久 江浪
雄司 境脇
進 渡辺
修一 野口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuclear Services Co
Japan Atomic Power Co Ltd
Original Assignee
Nuclear Services Co
Japan Atomic Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nuclear Services Co, Japan Atomic Power Co Ltd filed Critical Nuclear Services Co
Application granted granted Critical
Publication of JP4323568B1 publication Critical patent/JP4323568B1/en
Publication of JPWO2009153881A1 publication Critical patent/JPWO2009153881A1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed

Abstract

ボルトに特別な加工を施すことなく、簡単な構造で、ボルト螺合部の応力を、容易に、しかも高精度で測定しうるようにした方法および装置を提供する。
支持体１に設けた雌ねじ孔２に、ボルト４の軸部４ａの先端部に設けた雄ねじ部４ｃを螺合するとともに、ボルト４における軸部４ａの基端部に設けた拡径頭部４ｂと支持体１との間に、スラスト転がり軸受１１と、このスラスト転がり軸受１１と当接する拡径フランジ６ｂの裏面に歪みセンサ７を貼着した受圧体６とを挟んで、ボルト４を締め付け、そのときの歪みセンサ７により検出した受圧体６の拡径フランジ６ｂの歪みに基づいて、ボルト４の螺合部の内部応力を測定する。
【選択図】図１Provided is a method and an apparatus capable of easily and accurately measuring the stress of a bolt screwing portion with a simple structure without performing special processing on the bolt.
The male screw portion 4c provided at the tip end portion of the shaft portion 4a of the bolt 4 is screwed into the female screw hole 2 provided in the support 1, and the enlarged diameter head portion 4b provided at the base end portion of the shaft portion 4a of the bolt 4. The bolt 4 is tightened with the thrust rolling bearing 11 and the pressure receiving body 6 having the strain sensor 7 attached to the back surface of the enlarged diameter flange 6b in contact with the thrust rolling bearing 11 between the bearing 1 and the support 1. Based on the distortion of the diameter-enlarging flange 6b of the pressure receiving body 6 detected by the strain sensor 7 at that time, the internal stress of the screwed portion of the bolt 4 is measured.
[Selection] Figure 1

Description

本発明は、ボルト螺合部の応力測定方法および装置に関する。   The present invention relates to a method and an apparatus for measuring a stress of a bolt screw part.

ボルトを用いた締結手段は、橋梁、鉄塔、建築物等の建造物、並びに大型および小型の機械製品等、多くの分野において広く用いられており、そのいずれの場合においても、いかなる原因によっても、ボルトの緩みや脱落が生じないことが必要である。   Fastening means using bolts are widely used in many fields such as bridges, steel towers, buildings, and large and small machinery products, and in any case, for any cause, It is necessary that the bolts do not loosen or fall off.

そのため、特にボルトの緩みが問題となる分野においては、ボルトの締め付け力を一定以上に保持するべく、種々の対策が講じられている。
例えば、表示手段により、ボルトの締め付けトルクが一定以上である旨を表示させるようにしたものや、ボルトの内部に歪みセンサを埋設し、ボルトの締め付け時の内部応力を直接表示させるようにしたもの(例えば特許文献１参照)、あるいはボルトの先端に荷重センサを設けたもの(例えば特許文献２参照)等がある。
特開２００４−２８６５５１号公報 特開２００７−２４０２０５号公報 For this reason, various measures are taken in order to keep the bolt tightening force at a certain level or more, particularly in the field where the looseness of the bolt is a problem.
For example, a display means that the bolt tightening torque is displayed above a certain level, or a strain sensor is embedded inside the bolt to directly display the internal stress when tightening the bolt. (For example, refer to Patent Document 1) or a bolt provided with a load sensor (for example, refer to Patent Document 2).
JP 2004-286551 A JP 2007-240205 A

しかし、ボルトの締め付けトルクを一定とするものにおいては、締め付けトルクを一定としても、螺合部への油の浸入や、ねじ部の変形等により、締め付け力が一定となるとは限らず、またボルトの内部に歪みセンサを埋設したり、ボルトの先端に荷重センサを設けたりしたものでは、ボルトへの歪みセンサや荷重センサの取付作業が面倒であり、製造コストが高くつく等の問題がある。   However, in the case where the bolt tightening torque is constant, even if the bolt tightening torque is constant, the tightening force is not always constant due to oil intrusion into the threaded portion, deformation of the screw portion, etc. In the case where a strain sensor is embedded in a bolt or a load sensor is provided at the tip of a bolt, the mounting work of the strain sensor or the load sensor on the bolt is troublesome, and there is a problem that the manufacturing cost is high.

本発明は、従来の技術が有する上記のような問題点に鑑み、ボルトに特別な加工を施すことなく、簡単な構造で、ボルト螺合部の応力を、容易に、しかも高精度で表示もしくは測定しうるようにした方法および装置を提供することを目的としている。   In view of the above-described problems of the prior art, the present invention displays the stress of the bolt screw part easily and with high accuracy with a simple structure without performing special processing on the bolt. It is an object of the present invention to provide a method and apparatus that can be measured.

本発明によると、上記課題は次のようにして解決される。
(１) ボルト螺合部の応力測定方法において、支持体に設けた雌ねじ孔に、ボルトの軸部の先端部に設けた雄ねじ部を螺合するとともに、前記ボルトにおける軸部の基端部に設けた拡径頭部と前記支持体との間に、スラスト転がり軸受と、このスラスト転がり軸受と当接する拡径フランジの裏面に歪みセンサを貼着した受圧体とを挟んで、前記ボルトを締め付け、そのときの前記歪みセンサにより検出した受圧体の拡径フランジの歪みに基づいて、前記ボルトの螺合部の内部応力を測定する。According to the present invention, the above problem is solved as follows.
(1) In the method for measuring the stress of the bolt threaded portion, the male threaded portion provided at the tip of the shaft portion of the bolt is screwed into the female threaded hole provided in the support, and the base end portion of the shaft portion of the bolt is engaged. Tighten the bolt with a thrust rolling bearing and a pressure receiving body with a strain sensor attached to the back of the diameter-enlarging flange in contact with the thrust rolling bearing between the enlarged-diameter head provided and the support. Then, based on the strain of the diameter-enlarged flange of the pressure receiving body detected by the strain sensor at that time, the internal stress of the threaded portion of the bolt is measured.

このような方法によると、ボルトの締め付け時における歪みセンサの検出値に基づいて、ボルトの螺合部の内部応力を容易に、しかも高精度で測定し、かつ表示することができるとともに、ボルトに特別な加工を施すことなく、簡単な構造で測定することができる。
特に、ボルトの拡径頭部と受圧体との間にスラスト転がり軸受を介在させて、ボルトを締め付けるので、ボルトのトルクが、受圧体に作用するのを防止することができ、歪みセンサの精度を高めることができる。
既存設備に対しても、使用されているボルトを外し、そのボルトか、または別のボルトに、スラスト転がり軸受と受圧体とを嵌合して、締め付け直すことにより、容易に適用することができる。
また、ボルトの締め付け量を変化させつつ、その間の歪みセンサの検出値の変動を測定することにより、ボルトの螺合部の状態の変化や、破壊限界を知ることができる。
さらに、実際のボルト締め付け部分にスラスト転がり軸受および受圧体を装着して、測定状態を継続することにより、ボルト締め付け部分の状態を経時的に監視することができ、万一、ボルトに緩みや脱落が生じた場合には、そのことを即座に知ることができる。According to such a method, it is possible to easily and accurately measure and display the internal stress of the screwed portion of the bolt based on the detection value of the strain sensor when the bolt is tightened. Measurements can be made with a simple structure without any special processing.
In particular, since a thrust rolling bearing is interposed between the enlarged diameter head of the bolt and the pressure receiving body to tighten the bolt, the torque of the bolt can be prevented from acting on the pressure receiving body, and the accuracy of the strain sensor Can be increased.
It can be easily applied to existing equipment by removing the used bolt and fitting the thrust rolling bearing and pressure receiving body to the bolt or another bolt and retightening. .
Further, by measuring the fluctuation of the detection value of the strain sensor during the tightening amount of the bolt, it is possible to know the change in the state of the screwed portion of the bolt and the breakage limit.
In addition, by attaching a thrust rolling bearing and pressure receiver to the actual bolt tightening part and continuing the measurement state, the state of the bolt tightening part can be monitored over time. If this happens, you can know immediately.

(２) 上記(１)項において、支持体と受圧体との間に被締付体を挟んで、ボルトを締め付ける。   (2) In the above item (1), the bolt is tightened with the clamped body sandwiched between the support body and the pressure receiving body.

このようにすると、実際の使用状態とほぼ同様の状態で、ボルトの螺合部の内部応力を容易に、しかも正確に測定することができる。   If it does in this way, the internal stress of the screwing part of a volt | bolt can be measured easily and correctly in the state substantially the same as an actual use condition.

(３) 上記(１)または(２)項において、支持体と受圧体との間にロードセルを挟んでボルトを締め付け、そのときの歪みセンサの検出値と、ロードセルの検出値とを比較する。   (3) In the above item (1) or (2), the bolt is tightened with the load cell sandwiched between the support and the pressure receiving body, and the detection value of the strain sensor at that time is compared with the detection value of the load cell.

このようにすると、歪みセンサが正常に作動しているか否かや、その検出精度等を正確に知ることができる。   In this way, it is possible to accurately know whether or not the strain sensor is operating normally, its detection accuracy, and the like.

(４) 上記(１)〜(３)項のいずれかにおいて、受圧体における拡径フランジの中央部に、スラスト転がり軸受から離れる方向に向かって漸次縮径するテーパー部を設け、このテーパー部の外周面に、歪みセンサを貼着するとともに、このテーパー部の内面を研削することにより、テーパー部の厚さを所望のものとする。   (4) In any one of the above items (1) to (3), a tapered portion that is gradually reduced in diameter in a direction away from the thrust rolling bearing is provided at a central portion of the diameter-enlarging flange of the pressure receiving body. A strain sensor is attached to the outer peripheral surface, and the inner surface of the tapered portion is ground to obtain a desired thickness of the tapered portion.

このようにすると、ボルトの締め付け時における受圧体の拡径フランジの歪みを、歪みセンサによって正確に捉えることができ、測定精度を高めることができるとともに、受圧体におけるテーパー部の内面を研削して、テーパー部の厚さを所望のものとすることにより、歪みセンサによる検出感度を所望のものに変更することができる。すなわち、テーパー部の厚さを小とすることにより、歪みセンサによる検出感度を高めることができる。
因みに、受圧体が、歪みセンサを貼着すべきテーパー部を有しない単なる筒状のものであって、この筒状部に歪みセンサが貼着されている場合には、切削加工等により、受圧体における歪みセンサ貼着部の厚さを簡単に変更させることはできない。In this way, distortion of the diameter-enlarged flange of the pressure receiving body at the time of bolt tightening can be accurately captured by the strain sensor, and measurement accuracy can be improved, and the inner surface of the tapered portion of the pressure receiving body can be ground. The detection sensitivity by the strain sensor can be changed to a desired value by setting the thickness of the tapered portion to a desired value. That is, the detection sensitivity by the strain sensor can be increased by reducing the thickness of the tapered portion.
By the way, when the pressure receiving body is a mere cylinder having no taper portion to which the strain sensor is to be attached, and the strain sensor is attached to the tubular portion, the pressure receiving body is cut by cutting or the like. The thickness of the strain sensor attaching part in the body cannot be easily changed.

(５) 上記(１)〜(４)項のいずれかにおいて、スラスト転がり軸受と、受圧体の拡径フランジとの間に、外径の異なるシムを介在させることにより、受圧体の拡径フランジにおける受圧範囲を変更し、もって歪みセンサによる検出感度を変更する。   (5) In any one of the above items (1) to (4), the shim having a different outer diameter is interposed between the thrust rolling bearing and the diameter-enlarging flange of the pressure-receiving body, whereby the diameter-enlarging flange of the pressure-receiving body The pressure receiving range is changed, and the detection sensitivity of the strain sensor is changed.

このようにすると、シムを交換するだけで、歪みセンサによる検出感度を簡単に変更することができる。
すなわち、介在させるシムの外径を大とすることにより、ボルトの締め付け時における受圧体の拡径フランジの曲げモーメントが大となり、歪みセンサによる検出感度を高めることができる。If it does in this way, the detection sensitivity by a distortion sensor can be changed easily only by exchanging shims.
That is, by increasing the outer diameter of the shim to be interposed, the bending moment of the diameter-enlarged flange of the pressure receiving body when tightening the bolt is increased, and the detection sensitivity by the strain sensor can be increased.

(６) ボルト螺合部の応力測定装置において、軸部の基端部に拡径頭部を有し、かつ軸部の先端部に設けた雄ねじ部を、支持体に設けた雌ねじ孔に螺合するようにしたボルトと、ボルトの拡径頭部と支持体との間において、ボルトの軸部に嵌合されたスラスト転がり軸受と、このスラスト転がり軸受と支持体との間において、ボルトの軸部に嵌合され、かつ前記スラスト転がり軸受と当接する拡径フランジの裏面に歪みセンサが貼着された受圧体と、前記歪みセンサに接続され、前記ボルトを締め付けたときの前記歪みセンサの検出出力を処理する信号処理手段とを備えるものとする。   (6) In the bolt threaded portion stress measurement device, a male screw portion having an enlarged head at the base end portion of the shaft portion and provided at the tip portion of the shaft portion is screwed into a female screw hole provided in the support. A thrust rolling bearing fitted on the shaft of the bolt, and between the thrust rolling bearing and the support body, and between the thrust rolling bearing and the support body. A pressure receiving body having a strain sensor attached to a back surface of a diameter-enlarged flange that is fitted to the shaft portion and is in contact with the thrust rolling bearing; and the strain sensor that is connected to the strain sensor and tightens the bolt. Signal processing means for processing the detection output is provided.

このような構成とすると、上記(１)項におけるボルト螺合部の応力測定方法と同様の効果を奏することができる。   With such a configuration, it is possible to achieve the same effect as the method for measuring the stress of the bolt screw part in the above item (1).

(７) 上記(６)項において、受圧体における拡径フランジの中央部に、スラスト転がり軸受から離れる方向に向かって漸次縮径するテーパー部を設け、このテーパー部の外周面に、歪みセンサを貼着する。   (7) In the above item (6), a tapered portion that gradually decreases in diameter in the direction away from the thrust rolling bearing is provided at the central portion of the diameter-enlarging flange of the pressure receiving body, and a strain sensor is provided on the outer peripheral surface of the tapered portion. Adhere.

このような構成とすると、ボルトの締め付け時における受圧体の拡径フランジの歪みを、歪みセンサによって正確に捉えることができる。   With such a configuration, the distortion of the diameter-enlarged flange of the pressure receiving body at the time of tightening the bolt can be accurately captured by the strain sensor.

(８) 上記(６)または(７)項において、支持体と受圧体との間に、ロードセルを介在させる。   (8) In the above item (6) or (7), a load cell is interposed between the support and the pressure receiving body.

このような構成とすると、歪みセンサが正常に作動しているか否かや、その検出精度等を正確に知ることができる。   With such a configuration, it is possible to accurately know whether the strain sensor is operating normally, its detection accuracy, and the like.

(９) 上記(６)〜(８)項のいずれかにおいて、スラスト転がり軸受と、受圧体の拡径フランジとの間に、シムを介在させる。   (9) In any one of the above items (6) to (8), a shim is interposed between the thrust rolling bearing and the diameter-enlarging flange of the pressure receiving body.

このような構成とすると、請求項５記載の発明におけるのと同様に、シムを、外径の異なるものと交換するだけで、歪みセンサによる検出感度を簡単に変更することができる。   With such a configuration, the detection sensitivity of the strain sensor can be easily changed by simply replacing the shim with one having a different outer diameter, as in the fifth aspect of the invention.

本発明によると、ボルトに特別な加工を施すことなく、簡単な構造で、ボルト螺合部の応力を、容易に、しかも高精度で表示もしくは測定しうるようにした方法および装置を提供することができる。 According to the present invention, there is provided a method and an apparatus capable of displaying or measuring a stress of a bolt screw part easily and with high accuracy with a simple structure without performing special processing on the bolt. Can do.

本発明の装置の第１の実施形態を示す中央縦断正面図と、その付属装置とを示す図である。It is a figure which shows the center longitudinal section front view which shows 1st Embodiment of the apparatus of this invention, and its attachment apparatus. 本発明の装置の第２の実施形態を示す中央縦断正面図である。It is a center longitudinal section front view showing a 2nd embodiment of the device of the present invention. 本発明の装置の第３の実施形態を示す中央縦断正面図である。It is a center longitudinal section front view showing a 3rd embodiment of the device of the present invention. 本発明の装置の第４の実施形態を示す中央縦断正面図と、その付属装置とを示す図である。It is a figure which shows the center vertical front view which shows 4th Embodiment of the apparatus of this invention, and its attachment apparatus.

以下、本発明の実施形態を、添付図面を参照して説明する。
図１は、本発明の装置の第１の実施形態を示す。
１は、雌ねじ孔２が設けられた支持体、３は、支持体１にボルト４をもって締着される被締付体である。
具体的には、支持体１としては、例えば機械装置のケース本体や台座、その他、被締付体３がボルト４をもって締着固定されるあらゆるものが含まれる。被締付体３としては、例えば支持体１としての機械装置のケース本体に締着される蓋体、その他、支持体１にボルト４をもって締着されるあらゆるものが含まれる。
被締付体３には、ボルト４の軸部４ａを嵌合しうるボルト挿通孔５が設けられている。Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a first embodiment of the device of the present invention.
Reference numeral 1 denotes a support body provided with a female screw hole 2, and 3 denotes a body to be fastened to the support body 1 with bolts 4.
Specifically, the support body 1 includes, for example, a case main body and a pedestal of a mechanical device, and any other body to which the tightened body 3 is fastened and fixed with a bolt 4. The to-be-tightened body 3 includes, for example, a lid body fastened to a case main body of a mechanical device as the support body 1, and other things to be fastened to the support body 1 with bolts 4.
The tightened body 3 is provided with a bolt insertion hole 5 into which the shaft portion 4a of the bolt 4 can be fitted.

ボルト４は、軸部４ａの基端部に拡径頭部４ｂを設け、かつ軸部４ａの先端部を、支持体１の雌ねじ孔２に螺合しうる雄ねじ部４ｃとしたものである。   The bolt 4 is provided with a diameter-enlarged head portion 4b at the base end portion of the shaft portion 4a, and the distal end portion of the shaft portion 4a is a male screw portion 4c that can be screwed into the female screw hole 2 of the support body 1.

６は、金属または硬質合成樹脂により形成された受圧体で、ボルト４の軸部４ａが嵌合しうる筒部６ａと、この筒部６ａの基端に外向きテーパー部６ｃを介して連設された拡径フランジ６ｂとからなり、拡径フランジ６ｂの周縁には、基端側を向く起立縁６ｄが設けられている。   6 is a pressure receiving body formed of metal or hard synthetic resin, and is connected to a cylindrical portion 6a into which the shaft portion 4a of the bolt 4 can be fitted, and a base end of the cylindrical portion 6a via an outward taper portion 6c. The diameter-enlarging flange 6b is provided, and a rising edge 6d facing the proximal end is provided on the periphery of the diameter-enlarging flange 6b.

前記テーパー部６ｃは、筒部６ａより約４５度の傾斜角度をもって、基端方向に漸次拡径している。   The tapered portion 6c gradually increases in diameter in the proximal direction with an inclination angle of about 45 degrees from the cylindrical portion 6a.

受圧体６のテーパー部６ｃの外周面には、複数の板状の歪みセンサ７が、円周方向に等間隔をもって貼着されている。各歪みセンサ７は、受圧体６のテーパー部６ｃの微小な歪みを電気信号として検出するもので、公知の歪みゲージを用いることができる。   A plurality of plate-shaped strain sensors 7 are attached to the outer peripheral surface of the tapered portion 6c of the pressure receiving body 6 at equal intervals in the circumferential direction. Each strain sensor 7 detects a minute strain of the tapered portion 6c of the pressure receiving body 6 as an electric signal, and a known strain gauge can be used.

各歪みセンサ７は、リード線８を介して、信号処理装置９に接続されている。
信号処理装置９は、各歪みセンサ７からの出力信号である電気信号を増幅したり、Ａ／Ｄ変換したりして、パソコンその他の情報処理装置１０において処理し易い信号に変換するものである。Each strain sensor 7 is connected to a signal processing device 9 via a lead wire 8.
The signal processing device 9 amplifies or A / D-converts an electrical signal that is an output signal from each strain sensor 7 and converts it into a signal that can be easily processed by the personal computer or other information processing device 10. .

情報処理装置１０は、信号処理装置９からの入力信号に基づいて、各歪みセンサ７により検出した受圧体６のテーパー部６ｃの歪みを、表示装置１０ａに表示したり、メモリー(図示略)に記録したりする機能を有している。   Based on the input signal from the signal processing device 9, the information processing device 10 displays the distortion of the tapered portion 6c of the pressure receiving body 6 detected by each strain sensor 7 on the display device 10a or in a memory (not shown). It has a function to record.

１１は、ボルト４の軸部４ａへ嵌合したスラスト転がり軸受で、玉軸受またはころ軸受とするのが好ましい。このスラスト転がり軸受１１の外径は、受圧体６の起立縁６ｄ内に嵌合しうるものとしてある。   11 is a thrust rolling bearing fitted to the shaft portion 4a of the bolt 4, and is preferably a ball bearing or a roller bearing. The outer diameter of the thrust rolling bearing 11 can be fitted into the rising edge 6 d of the pressure receiving body 6.

次に、上記装置を用いて、実際にボルト螺合部の応力を測定する、本発明の方法の実施要領について説明する。
まず、支持体１に、被締付体３が既存のボルトをもって締着されている場合には、そのボルトを外し、そのボルトと同じ雄ねじ部４ｃを有する長寸のボルト４の軸部４ａに、スラスト転がり軸受１１と、受圧体６とを、受圧体６の起立縁６ｄ内にスラスト転がり軸受１１の一部が嵌合されるようにして、順次外嵌し、その状態で、ボルト４の軸部４ａを被締付体３のボルト挿通孔５に挿通するとともに、雄ねじ部４ｃを、支持体１の雌ねじ孔２に螺合する。Next, an implementation procedure of the method of the present invention, in which the stress of the bolt screwing part is actually measured using the above apparatus will be described.
First, when the to-be-tightened body 3 is fastened to the support body 1 with an existing bolt, the bolt is removed, and the shaft portion 4a of the long bolt 4 having the same male thread portion 4c as the bolt is removed. The thrust rolling bearing 11 and the pressure receiving body 6 are sequentially fitted out so that a part of the thrust rolling bearing 11 is fitted into the rising edge 6d of the pressure receiving body 6, and in this state, the bolt 4 The shaft portion 4 a is inserted into the bolt insertion hole 5 of the tightened body 3, and the male screw portion 4 c is screwed into the female screw hole 2 of the support 1.

なお、ボルト螺合部自体の応力を測定する場合には、被締付体３を外しておいてもよい。
また、被締付体３の厚さが、スラスト転がり軸受１１の厚さと、受圧体６の厚さとの和に近い場合は、それまで締着していたボルト４を支持体１から一旦外し、そのボルトの軸部から被締付体３を外して、代わりにスラスト転がり軸受１１と受圧体６とを軸部に嵌合した状態で、ボルト４を再度支持体１の雌ねじ孔２に螺合するようにしてもよい。In addition, when measuring the stress of the bolt screw part itself, the to-be-tightened body 3 may be removed.
Further, when the thickness of the tightened body 3 is close to the sum of the thickness of the thrust rolling bearing 11 and the thickness of the pressure receiving body 6, the bolt 4 that has been fastened until then is once removed from the support body 1, The to-be-tightened body 3 is removed from the shaft portion of the bolt, and the bolt 4 is again screwed into the female screw hole 2 of the support body 1 with the thrust rolling bearing 11 and the pressure receiving body 6 fitted to the shaft portion. You may make it do.

ボルト４の雄ねじ部４ｃを支持体１の雌ねじ孔２に螺合することにより、ボルト４の拡径頭部４ｂと支持体１との間に、スラスト転がり軸受１１と受圧体６と被締付体３とが挟まれる。   By screwing the male threaded portion 4c of the bolt 4 into the female threaded hole 2 of the support body 1, the thrust rolling bearing 11, the pressure receiving body 6 and the tightened portion are tightened between the enlarged diameter head portion 4b of the bolt 4 and the support body 1. The body 3 is sandwiched.

この状態で、ボルト４を締め付けつつ、そのときの歪みセンサ７により検出した受圧体６の拡径フランジ６ｂ、特にそのテーパー部６ｃの歪み、およびその変動を、情報処理装置１０における表示装置に表示したり、メモリーに記録したりする。   In this state, while tightening the bolt 4, the diameter expansion flange 6b of the pressure receiving body 6 detected by the strain sensor 7 at that time, in particular, the distortion of the tapered portion 6c, and the variation thereof are displayed on the display device in the information processing apparatus 10. Or record in memory.

このときに測定された受圧体６のテーパー部６ｃの歪みは、ボルト４の雄ねじ部４ｃと支持体１の雌ねじ孔２との螺合部の内部応力と対応するので、その螺合部の内部応力の大きさを知ることができる。
特に、ボルト４の拡径頭部４ｂと受圧体６との間に、スラスト転がり軸受１１を介在させて、ボルト４を締め付けるので、ボルト４のトルクが、受圧体６に作用するのを防止することができ、歪みセンサ７の精度を高めることができる。Since the distortion of the taper portion 6c of the pressure receiving body 6 measured at this time corresponds to the internal stress of the threaded portion between the male threaded portion 4c of the bolt 4 and the female threaded hole 2 of the support 1, the inside of the threaded portion. Know the magnitude of the stress.
In particular, the thrust rolling bearing 11 is interposed between the diameter-enlarged head 4b of the bolt 4 and the pressure receiving body 6, and the bolt 4 is tightened, so that the torque of the bolt 4 is prevented from acting on the pressure receiving body 6. Therefore, the accuracy of the strain sensor 7 can be increased.

また、ボルト４を所要トルクで締め付けたときの受圧体６のテーパー部６ｃの歪みを検出することにより、締め付けトルクとボルト螺合部の応力との関係を知ることができる。
例えば、ボルト４を所要トルクで締め付けたにも拘わらず、ボルト螺合部の応力が予め定めた値に達しないときは、例えば支持体１の雌ねじ孔２の変形、雌ねじ孔２への異物の混入等の何らかの異常があることを知ることができる。Further, by detecting the distortion of the tapered portion 6c of the pressure receiving body 6 when the bolt 4 is tightened with a required torque, it is possible to know the relationship between the tightening torque and the bolt screw portion stress.
For example, when the bolt 4 is tightened with a required torque and the stress of the bolt threaded portion does not reach a predetermined value, for example, deformation of the female screw hole 2 of the support 1, It is possible to know that there is some abnormality such as contamination.

さらに、このまま測定状態を継続することにより、ボルト締め付け部分の状態を経時的に監視することができ、万一、ボルト４に緩みや脱落が生じた場合には、そのことを即座に知ることができる。   Furthermore, by continuing the measurement state as it is, the state of the bolt tightening portion can be monitored over time. If the bolt 4 is loosened or dropped out, it can be immediately known. it can.

次に、歪みセンサ７による検出感度を、所望のものに変更する方法について説明する。
その第１の方法は、図１に示す受圧体６のテーパー部６ｃの内面を、受圧体６をボルト４の軸部４ａに嵌合する前に、予め研削して、例えば図２に示すようにテーパー部６ｃの厚さを薄くする方法である。
このように、テーパー部６ｃの厚さを薄くすると、ボルト４の締め付け時に、テーパー部６ｃが弾性撓曲し易くなり、歪みセンサ７による検出感度を高めることができる。Next, a method for changing the detection sensitivity of the strain sensor 7 to a desired one will be described.
In the first method, the inner surface of the tapered portion 6c of the pressure receiving body 6 shown in FIG. 1 is ground in advance before the pressure receiving body 6 is fitted to the shaft portion 4a of the bolt 4, as shown in FIG. In this method, the thickness of the tapered portion 6c is reduced.
Thus, if the thickness of the taper portion 6c is reduced, the taper portion 6c is easily elastically bent when the bolt 4 is tightened, and the detection sensitivity of the strain sensor 7 can be increased.

第２の方法は、図３に示すように、スラスト転がり軸受１１と、受圧体６の拡径フランジ６ｂとの間に、外径の異なるシム１２、１３を介在させることにより、受圧体６の拡径フランジ６ｂにおける受圧範囲を変更し、もって歪みセンサ７による検出感度を変更する方法である。   As shown in FIG. 3, the second method is such that shims 12 and 13 having different outer diameters are interposed between the thrust rolling bearing 11 and the diameter-enlarging flange 6 b of the pressure receiving body 6. In this method, the pressure receiving range in the diameter-enlarging flange 6b is changed to change the detection sensitivity of the strain sensor 7.

すなわち、図３(ａ)に示すように、スラスト転がり軸受１１と受圧体６の拡径フランジ６ｂとの間に、大きな外径Ｒ１のシム１２を介在させると、受圧体６の拡径フランジ６ｂにおける受圧範囲、およびボルト４の締め付け時における受圧体６の拡径フランジ６ｂの曲げモーメントが大となり、拡径フランジ６ｂ、特にそのテーパー部６ｃが弾性撓曲し易くなり、歪みセンサ７による検出感度を高めることができる。   That is, as shown in FIG. 3A, when a shim 12 having a large outer diameter R1 is interposed between the thrust rolling bearing 11 and the diameter-enlarging flange 6b of the pressure-receiving body 6, the diameter-enlarging flange 6b of the pressure-receiving body 6 is provided. And the bending moment of the diameter-enlarged flange 6b of the pressure-receiving body 6 at the time of tightening the bolt 4 is increased, and the diameter-enlarged flange 6b, particularly the tapered portion 6c, is easily elastically bent, and the detection sensitivity by the strain sensor 7 is increased. Can be increased.

一方、図３(ｂ)に示すように、スラスト転がり軸受１１と受圧体６の拡径フランジ６ｂとの間に、小さな外径Ｒ２のシム１３を介在させると、受圧体６の拡径フランジ６ｂにおける受圧範囲、およびボルト４の締め付け時における受圧体６の拡径フランジ６ｂの曲げモーメントが小となり、拡径フランジ６ｂ、特にそのテーパー部６ｃが弾性撓曲し難くなり、歪みセンサ７による検出感度を下げることができる。   On the other hand, as shown in FIG. 3B, when a shim 13 having a small outer diameter R2 is interposed between the thrust rolling bearing 11 and the diameter-enlarging flange 6b of the pressure-receiving body 6, the diameter-enlarging flange 6b of the pressure-receiving body 6 is interposed. , And the bending moment of the diameter-enlarged flange 6b of the pressure-receiving body 6 when the bolt 4 is tightened is small, and the diameter-enlarged flange 6b, particularly the tapered portion 6c, is difficult to bend elastically. Can be lowered.

したがって、シム１２、１３を交換するだけで、歪みセンサ７による検出感度を簡単に変更することができる。   Therefore, the detection sensitivity of the strain sensor 7 can be easily changed by simply replacing the shims 12 and 13.

次に、歪みセンサ７が正常に作動しているか否かを検査する方法について説明する。
この方法は、図４に示すように、支持体１と受圧体６との間にロードセル１４を挟み、ロードセル１４と信号処理装置９とを、リード線１５をもって接続し、その状態でボルト４を締め付け、そのときの歪みセンサ７の検出値と、ロードセル１４の検出値とを比較する方法である。
なお、支持体１とロードセル１４との間に、被締付体３を介在させておいてもよい。Next, a method for inspecting whether or not the strain sensor 7 is operating normally will be described.
In this method, as shown in FIG. 4, a load cell 14 is sandwiched between the support 1 and the pressure receiving body 6, the load cell 14 and the signal processing device 9 are connected with a lead wire 15, and the bolt 4 is attached in this state. In this method, the detected value of the strain sensor 7 at that time and the detected value of the load cell 14 are compared.
In addition, the to-be-tightened body 3 may be interposed between the support body 1 and the load cell 14.

歪みセンサ７の検出値と、ロードセル１４の検出値とが常に同一か、またはその増減の比率が同一であるときは、歪みセンサ７が正常に作動しており、かつ検出精度が維持されていることを知ることができ、万一、それらの間に相違が生じたときは、歪みセンサ７、もしくはそれが貼着されている受圧体６、または装置全体に異常が生じていることを知ることができる。   When the detection value of the strain sensor 7 and the detection value of the load cell 14 are always the same, or when the increase / decrease ratio is the same, the strain sensor 7 is operating normally and the detection accuracy is maintained. If there is a difference between them, know that there is an abnormality in the strain sensor 7, or the pressure receiving body 6 to which it is attached, or the entire device. Can do.

ロードセル１４を含めた図４に示す装置は、歪みセンサ７、および装置全体の検査装置ということもできる。   The apparatus shown in FIG. 4 including the load cell 14 can also be referred to as a strain sensor 7 and an inspection apparatus for the entire apparatus.

以上から明らかなように、本発明のボルト螺合部の応力測定方法および装置によると、ボルトに特別な加工を施すことなく、簡単な構造で、ボルト螺合部の応力を、容易に、しかも高精度で測定することができる。   As is apparent from the above, according to the method and apparatus for measuring the stress of the bolt threaded portion of the present invention, the stress of the bolt threaded portion can be easily and easily made with a simple structure without applying special processing to the bolt. It can be measured with high accuracy.

なお、本発明は、上記実施形態のみに限定されるものではなく、幾多の変形した態様での実施が可能である。
例えば、ボルト４の軸部４ａの外周面にも歪みセンサを貼着するとともに、ボルト４の拡径頭部４ｂを、トルクレンチをもって回転させ、そのときのボルト４の軸部４ａに発生するトルクと、歪みセンサ７(およびロードセル１４)により検出されるボルト螺合部の応力との関係を測定しうるようにしてもよい。In addition, this invention is not limited only to the said embodiment, The implementation in many modified aspects is possible.
For example, a strain sensor is attached to the outer peripheral surface of the shaft portion 4 a of the bolt 4, and the enlarged diameter head portion 4 b of the bolt 4 is rotated with a torque wrench, and the torque generated in the shaft portion 4 a of the bolt 4 at that time And the stress of the bolt screw portion detected by the strain sensor 7 (and the load cell 14) may be measured.

また、受圧体６のテーパー部６ｃの外周面の傾斜角度は、４５度に限るものではなく、例えば、その中心軸線に対して、６０度、またはその他の角度とすることができる。
さらに、ボルト４に代えて、スタッドボルトとナットとを用いることもできる。Further, the inclination angle of the outer peripheral surface of the tapered portion 6c of the pressure receiving body 6 is not limited to 45 degrees, and can be, for example, 60 degrees or another angle with respect to the central axis.
Further, a stud bolt and a nut can be used instead of the bolt 4.

本発明は、ボルトをもって被締付体を支持体に締着するあらゆるものに適用することができる。
例えば、基礎への構造物のボルト締め付け部分に適用した場合は、この部分に設けた歪みセンサーの検出値を長期に亘って監視することにより、耐久性を確認しうるとともに、地震発生時におけるボルト螺合部の応力の変動、それに基づくボルト折損等の異常を検出することができる。The present invention can be applied to anything that fastens a member to be fastened to a support with a bolt.
For example, when applied to the bolt tightening part of the structure to the foundation, the durability can be confirmed by monitoring the detection value of the strain sensor provided in this part over a long period of time. It is possible to detect abnormalities such as fluctuations in the stress of the threaded portion and broken bolts based on the fluctuation.

Claims (9)

支持体に設けた雌ねじ孔に、ボルトの軸部の先端部に設けた雄ねじ部を螺合するとともに、前記ボルトにおける軸部の基端部に設けた拡径頭部と前記支持体との間に、スラスト転がり軸受と、このスラスト転がり軸受と当接する拡径フランジの裏面に歪みセンサを貼着した受圧体とを挟んで、前記ボルトを締め付け、そのときの前記歪みセンサにより検出した受圧体の拡径フランジの歪みに基づいて、前記ボルトの螺合部の内部応力を測定することを特徴とするボルト螺合部の応力測定方法。  A male screw portion provided at the tip of the bolt shaft portion is screwed into a female screw hole provided in the support member, and between the enlarged diameter head provided at the base end portion of the shaft portion of the bolt and the support member. Sandwiching a thrust rolling bearing and a pressure receiving body having a strain sensor affixed to the back surface of a diameter-enlarging flange in contact with the thrust rolling bearing, tightening the bolt, and the pressure receiving body detected by the strain sensor at that time A method for measuring a stress of a bolt threaded portion, wherein an internal stress of a threaded portion of the bolt is measured based on distortion of an enlarged diameter flange. 支持体と受圧体との間に被締付体を挟んで、ボルトを締め付けることを特徴とする請求項１記載のボルト螺合部の応力測定方法。  The method of measuring a stress of a bolt threaded portion according to claim 1, wherein the bolt is tightened by sandwiching a body to be fastened between the support body and the pressure receiving body. 支持体と受圧体との間にロードセルを挟んでボルトを締め付け、そのときの歪みセンサの検出値と、ロードセルの検出値とを比較することを特徴とする請求項１または２記載のボルト螺合部の応力測定方法。  The bolt screwing according to claim 1 or 2, wherein a bolt is tightened with a load cell sandwiched between the support and the pressure receiving body, and a detection value of the strain sensor at that time is compared with a detection value of the load cell. Stress measurement method. 受圧体における拡径フランジの中央部に、スラスト転がり軸受から離れる方向に向かって漸次縮径するテーパー部を設け、このテーパー部の外周面に、歪みセンサを貼着するとともに、このテーパー部の内面を研削することにより、テーパー部の厚さを所望のものとすることを特徴とする請求項１〜３のいずれかに記載のボルト螺合部の応力測定方法。  At the center of the diameter-enlarging flange of the pressure-receiving body, a tapered portion that gradually decreases in the direction away from the thrust rolling bearing is provided, and a strain sensor is attached to the outer peripheral surface of the tapered portion, and the inner surface of the tapered portion. The method for measuring the stress of the bolt threaded portion according to any one of claims 1 to 3, wherein a desired thickness of the taper portion is obtained by grinding. スラスト転がり軸受と、受圧体の拡径フランジとの間に、外径の異なるシムを介在させることにより、受圧体の拡径フランジにおける受圧範囲を変更し、もって歪みセンサによる検出感度を変更することを特徴とする請求項１〜４のいずれかに記載のボルト螺合部の応力測定方法。  By changing the pressure receiving range of the diameter-enhanced flange of the pressure-receiving body by interposing a shim with a different outer diameter between the thrust rolling bearing and the diameter-enlarging flange of the pressure-receiving body, the detection sensitivity of the strain sensor is changed. The stress measurement method of the bolt screwing part in any one of Claims 1-4 characterized by these. 軸部の基端部に拡径頭部を有し、かつ軸部の先端部に設けた雄ねじ部を、支持体に設けた雌ねじ孔に螺合するようにしたボルトと、
ボルトの拡径頭部と支持体との間において、ボルトの軸部に嵌合されたスラスト転がり軸受と、
このスラスト転がり軸受と支持体との間において、ボルトの軸部に嵌合され、かつ前記スラスト転がり軸受と当接する拡径フランジの裏面に歪みセンサが貼着された受圧体と、
前記歪みセンサに接続され、前記ボルトを締め付けたときの前記歪みセンサの検出出力を処理する信号処理手段
とを備えることを特徴とするボルト螺合部の応力測定装置。A bolt having a diameter-increased head at the base end portion of the shaft portion, and a male screw portion provided at the tip portion of the shaft portion screwed into a female screw hole provided in the support;
A thrust rolling bearing fitted to the shaft of the bolt between the enlarged head of the bolt and the support;
Between the thrust rolling bearing and the support body, a pressure receiving body that is fitted to the shaft portion of the bolt and has a strain sensor attached to the back surface of the enlarged diameter flange that comes into contact with the thrust rolling bearing;
A stress measuring device for a bolt screw portion, comprising: a signal processing unit that is connected to the strain sensor and processes a detection output of the strain sensor when the bolt is tightened. 受圧体における拡径フランジの中央部に、スラスト転がり軸受から離れる方向に向かって漸次縮径するテーパー部を設け、このテーパー部の外周面に、歪みセンサを貼着したことを特徴とする請求項６記載のボルト螺合部の応力測定装置。  A taper portion that gradually decreases in diameter in a direction away from the thrust rolling bearing is provided at a central portion of the diameter-enlarging flange of the pressure receiving body, and a strain sensor is attached to the outer peripheral surface of the taper portion. 6. A device for measuring a stress of a bolt threaded portion according to 6. 支持体と受圧体との間に、ロードセルを介在させたことを特徴とする請求項６または７記載のボルト螺合部の応力測定装置。  The bolt threaded portion stress measuring device according to claim 6 or 7, wherein a load cell is interposed between the support and the pressure receiving body. スラスト転がり軸受と、受圧体の拡径フランジとの間に、シムを介在させたことを特徴とする請求項６〜８のいずれかに記載のボルト螺合部の応力測定装置。  The bolt threaded portion stress measuring device according to any one of claims 6 to 8, wherein a shim is interposed between the thrust rolling bearing and the diameter-enlarging flange of the pressure receiving body.
JP2009514292A 2008-06-20 2008-06-20 Method and device for measuring stress of bolted portion Active JP4323568B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/061321 WO2009153881A1 (en) 2008-06-20 2008-06-20 Measuring method and measuring device of stress in bolt screwing part

Publications (2)

Publication Number Publication Date
JP4323568B1 true JP4323568B1 (en) 2009-09-02
JPWO2009153881A1 JPWO2009153881A1 (en) 2011-11-24

Family

ID=41149058

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009514292A Active JP4323568B1 (en) 2008-06-20 2008-06-20 Method and device for measuring stress of bolted portion

Country Status (2)

Country Link
JP (1) JP4323568B1 (en)
WO (1) WO2009153881A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106197820A (en) * 2016-08-29 2016-12-07 上海百若试验仪器有限公司 The integrated form pressure of a kind of Multifunctional bolt fastening system turns round duplex measurement device
CN106323523A (en) * 2016-08-17 2017-01-11 斯加特流体控制设备（成都）有限公司 Torque testing device for testing torque of pneumatic hydraulic actuator of angular travel type
CN106346420A (en) * 2016-09-14 2017-01-25 北京航空航天大学 Precise pre-tightening device for bolts
CN109186822A (en) * 2018-08-02 2019-01-11 大连理工大学 A kind of bolt fastening faying face face pressure detection method based on FBG sensor
CN109186823A (en) * 2018-08-02 2019-01-11 大连理工大学 The scaling method in conjunction with face face pressure is bolted based on FBG sensor detection
CN109612626A (en) * 2019-01-03 2019-04-12 武汉科技大学 A kind of Axial stress in bolt sensor
CN113479234A (en) * 2021-08-25 2021-10-08 嘉兴爱的科技有限公司 Health state monitoring device and system of track fixing assembly
CN115452233A (en) * 2022-08-15 2022-12-09 中机生产力促进中心有限公司 Pretightening force detection device of threaded fastener

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5715342B2 (en) * 2010-01-21 2015-05-07 日東精工株式会社 Thrust load detection mechanism
JP5482526B2 (en) * 2010-07-14 2014-05-07 東京電力株式会社 Method and apparatus for measuring stress of steel tower member by stress release method
CN102466531A (en) * 2010-11-10 2012-05-23 三一电气有限责任公司 Bolt fault monitoring system and monitoring method thereof
JP2015131364A (en) * 2014-01-10 2015-07-23 三菱重工業株式会社 Bolt axial force test apparatus and bolt axial force test method
DE102016109432B4 (en) * 2016-05-23 2023-08-31 Minebea Intec GmbH Procedure for compensating for long-term drifts and creep phenomena on bolt sensors in earthquake-prone areas
CN116929624B (en) * 2023-09-19 2024-01-19 广州市市政工程试验检测有限公司 Bolt shaft force monitoring device, method, equipment and medium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324878A1 (en) * 1993-07-25 1994-12-08 Berwald Werner Screw-securing means with optical function display
JP2005297133A (en) * 2004-04-13 2005-10-27 Isuzu Motors Ltd Fastening tool, and method for measuring axial force of bolt
JP2006162394A (en) * 2004-12-06 2006-06-22 Foa-Saito:Kk Washer for stress measurement

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106323523A (en) * 2016-08-17 2017-01-11 斯加特流体控制设备（成都）有限公司 Torque testing device for testing torque of pneumatic hydraulic actuator of angular travel type
CN106323523B (en) * 2016-08-17 2018-12-28 斯加特流体控制设备（成都）有限公司 Torsion-testing apparatus for test angles stroke class pneumatic hydraulic actuator torque
CN106197820A (en) * 2016-08-29 2016-12-07 上海百若试验仪器有限公司 The integrated form pressure of a kind of Multifunctional bolt fastening system turns round duplex measurement device
CN106346420A (en) * 2016-09-14 2017-01-25 北京航空航天大学 Precise pre-tightening device for bolts
CN106346420B (en) * 2016-09-14 2018-03-20 北京航空航天大学 A kind of accurate pre-tightening apparatus of bolt
CN109186822A (en) * 2018-08-02 2019-01-11 大连理工大学 A kind of bolt fastening faying face face pressure detection method based on FBG sensor
CN109186823A (en) * 2018-08-02 2019-01-11 大连理工大学 The scaling method in conjunction with face face pressure is bolted based on FBG sensor detection
CN109612626A (en) * 2019-01-03 2019-04-12 武汉科技大学 A kind of Axial stress in bolt sensor
CN113479234A (en) * 2021-08-25 2021-10-08 嘉兴爱的科技有限公司 Health state monitoring device and system of track fixing assembly
CN113479234B (en) * 2021-08-25 2022-07-22 嘉兴爱的科技有限公司 Health state monitoring device and system of track fixing assembly
CN115452233A (en) * 2022-08-15 2022-12-09 中机生产力促进中心有限公司 Pretightening force detection device of threaded fastener
CN115452233B (en) * 2022-08-15 2023-10-24 中机生产力促进中心有限公司 Pretightening force detection device of threaded fastener

Also Published As

Publication number Publication date
WO2009153881A1 (en) 2009-12-23
JPWO2009153881A1 (en) 2011-11-24

Similar Documents

Publication Publication Date Title
JP4323568B1 (en) Method and device for measuring stress of bolted portion
US7350420B2 (en) Device for measuring pre-stressing force in a bolt-nut connection
CA2300894C (en) Load indicating fastener systems method and apparatus
JP2010117334A (en) Method and instrument for measuring bolt axial force
JP2015131364A (en) Bolt axial force test apparatus and bolt axial force test method
US8096194B2 (en) Transducer for measuring preload and torque of a screw and apparatus therewith
US20080047353A1 (en) Method and apparatus for indicating a load
CN203561472U (en) Wheel core axle bolt pretightening force detection device
CN110658129A (en) Device for testing total friction coefficient of threaded fastener
RU2401423C1 (en) Method to control threaded joint tightening force
US20050235755A1 (en) Non-intrusive pressure sensing device
JP4316283B2 (en) Tensile anchorage structure and tendon stress measurement method
US20200208672A1 (en) Apparatus and Method to Establish Two Reference Positions Within a Fastener In Order to Allow the Measurement and Monitoring of Fastener Load
JP2005091086A (en) Bolt axial force detector, bolt having the same, and method for controlling bolt and its fastening
CN104568281A (en) Vehicle wheel core shaft bolt pretightening force detection device
JP6621604B2 (en) Angle wrench
JP2023553249A (en) Apparatus and method for determining the amount of force applied in a clamping component
CN211205608U (en) Bolt assembly and system for detecting stress of bolt
JP2009115674A (en) Combustion pressure sensor
CN114018463B (en) Ballast type bolt axial force calibration measurement device and calibration method
KR100295844B1 (en) Device measuring bolt force of plastic region tightening bolt
WO2022162899A1 (en) U-bolt, construction method, and measurement device
JPH04124437U (en) Bearing tightening force measuring device
JP2024009615A (en) Bolt with looseness sensor, method for using the same, and looseness detection system
WO2022232636A1 (en) Slew drive systems and methods of use thereof

Legal Events

Date Code Title Description
TRDD Decision of grant or rejection written
A975 Report on accelerated examination

Free format text: JAPANESE INTERMEDIATE CODE: A971005

Effective date: 20090522

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090602

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090604

R150 Certificate of patent or registration of utility model

Ref document number: 4323568

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120612

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120612

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130612

Year of fee payment: 4

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313117

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250