JPH074530Y2 - Bolt tightening tool with axial force sensor - Google Patents
Bolt tightening tool with axial force sensorInfo
- Publication number
- JPH074530Y2 JPH074530Y2 JP1988158468U JP15846888U JPH074530Y2 JP H074530 Y2 JPH074530 Y2 JP H074530Y2 JP 1988158468 U JP1988158468 U JP 1988158468U JP 15846888 U JP15846888 U JP 15846888U JP H074530 Y2 JPH074530 Y2 JP H074530Y2
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- axial force
- sensor
- tightening tool
- tightening
- 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.)
- Expired - Lifetime
Links
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は，建築物，発電プラント，橋梁，自動車，舶用
機関等の各種機器，構造物を連結するボルトを締結する
軸力センサ付ボルト締付工具に関するものである。[Detailed Description of the Invention] (Industrial field of application) The present invention is a bolt tightening with an axial force sensor for tightening bolts for connecting various devices and structures such as buildings, power plants, bridges, automobiles, marine engines, etc. It is related to a tool.
（従来の技術） 建築物，発電プラント，橋梁，自動車，舶用機関等の各
種機器，構造物を連結するのにボルトが多用されてい
る。このボルトでは，ボルト軸力，即ち，締め付けた際
のボルトに作用する引張力を管理する必要がある。この
ボルト軸力が過大であると，ボルトが折損するし，ボル
ト軸力が過少であると，ボルトが緩む。(Prior Art) Bolts are often used to connect various devices and structures such as buildings, power plants, bridges, automobiles, marine engines, and the like. With this bolt, it is necessary to control the bolt axial force, that is, the tensile force that acts on the bolt when tightened. If the bolt axial force is too large, the bolt will break, and if the bolt axial force is too small, the bolt will loosen.
ボルトの締付力を管理する方法の代表例としていは，ト
ルク管理方法があるが，この方法は，ボルトを締め付け
る時の締付トルクを管理する方法であって，トルク軸力
を管理する方法ではない。即ち，締付トルクは，ボルト
・ナツトのねじ面及び座面の摩擦抵抗（摩擦係数）によ
り影響されるので，トルク管理方法では，ねじ面及び座
面の仕上げ状態や両ねじの噛み合い状態によって，軸力
にバラツキが生じる。A typical example of a method for managing the tightening force of a bolt is a torque management method. This method is a method for managing a tightening torque when tightening a bolt and a method for managing a torque axial force. is not. That is, the tightening torque is affected by the frictional resistance (friction coefficient) of the screw surface and seat surface of the bolt / nut, so in the torque management method, depending on the finish state of the screw surface and seat surface and the meshing state of both screws, Axial force varies.
これに対して超音波式軸力管理方法は，ボルトの軸力を
直接的に管理する方法であり，軸力のバラツキが非常に
少ないことで注目されている。この方法を第４図により
説明すると，（11）が超音波センサ，（12）がセンサホ
ルダ，（13）がスプリング，（14）かケーシング，（1
5）がボルト頭部，（16）が突起部，（17）が超音波セ
ンサ（11）とボルト頭部（15）との間に介在する接触媒
質（水，油等），（18）がケーシング（14）の嵌合部
で，ボルト頭部（15）に接触媒質（17）を介して超音波
センサ（５）を接触させ，他の端面の反射エコーを受信
し，軸力負荷に伴う音速変化，寸法変化による伝播時間
の変化量をモニタして，これを管理する方法である。即
ち，ボルトの材質と形状が同じであれば，ボルトを締め
付けた際に，その反力としてボルトに締付力，即ち，軸
力Ｆが作用する。この軸力Ｆは，第４図に示すようにボ
ルトの締付前後の超音波伝播時間差をΔt,比例定数をｋ
β，締め付け前の超音波伝播時間をt0，締め付け後の超
音波伝播時間をｔσとすると， Ｆ＝ｋβ・Δｔ＝ｋβ（ｔσ−t0）・・・ により求められる。この超音波式軸力管理方法は，軸力
Ｆがボルトに作用した際，ボルト全長が伸びることと，
音速が遅くなることを利用している。そして超音波セン
サ（11）をボルトの一端面にマグネツトにより固定し，
もう一方の端面からスパナ等で締め付けていた。この場
合，超音波伝播時間の変化量，即ち，軸力を連続的にモ
ニタリングして，締め付けを行うようにしていた。On the other hand, the ultrasonic axial force management method is a method of directly controlling the axial force of the bolt, and has attracted attention because it has very little variation in axial force. This method will be described with reference to FIG. 4. (11) is an ultrasonic sensor, (12) is a sensor holder, (13) is a spring, (14) or a casing, (1
5) is a bolt head, (16) is a protrusion, (17) is a contact medium (water, oil, etc.) interposed between the ultrasonic sensor (11) and the bolt head (15), (18) At the fitting part of the casing (14), the ultrasonic sensor (5) is brought into contact with the bolt head (15) through the contact medium (17), and the reflected echo of the other end face is received, which is accompanied by the axial load. This is a method to monitor and manage the amount of change in propagation time due to changes in sound velocity and size. That is, if the material and the shape of the bolt are the same, when the bolt is tightened, the tightening force, that is, the axial force F acts on the bolt as a reaction force. This axial force F is, as shown in Fig. 4, the ultrasonic wave propagation time difference before and after tightening the bolt is Δt and the proportional constant is k.
beta, t 0 the previous ultrasonic wave propagation time tightening, when Tishiguma the ultrasonic wave propagation time after clamping, is determined by F = kβ · Δt = kβ ( tσ-t 0) ···. In this ultrasonic axial force management method, when the axial force F acts on the bolt, the total length of the bolt increases and
It takes advantage of the slow sound speed. Then, fix the ultrasonic sensor (11) to one end surface of the bolt with a magnet,
It was tightened with a spanner etc. from the other end surface. In this case, the tightening is performed by continuously monitoring the amount of change in ultrasonic wave propagation time, that is, the axial force.
またボルトの一端面しかアクセスできない場合には，ボ
ルト締付工具を取り外した状態で，例えば第５図に示す
ように，超音波センサ（11）とセンサホルダ（12）とス
プリング（13）とケーシング（14）とよりなる超音波軸
力測定用プローブをボルト頭部（15）に嵌合して，軸力
の計測を行うようにしていた。If only one end surface of the bolt can be accessed, the ultrasonic sensor (11), the sensor holder (12), the spring (13) and the casing are removed with the bolt tightening tool removed as shown in FIG. 5, for example. The probe for ultrasonic axial force measurement consisting of (14) was fitted to the bolt head (15) to measure the axial force.
なお超音波式軸力管理方法を適用する上で重要なポイン
トは，計測の際に，超音波センサとボルト端面との間に
介在する接触媒質（水，油等）の膜厚を一定に保持する
ことである。計測される超音波伝播時間は，ボルト長さ
と接触媒質の膜厚をトータルしたものであるから，軸力
負荷に伴うボルトの音速変化と寸法変化による微小な超
音波伝播時間を計測してゆくためには，接触媒質の膜厚
を極力変動しないようにする必要がある。膜厚が変動す
ると，測定精度が悪化して，超音波式軸力管理方法のメ
リツトがなくなることにもなる。An important point in applying the ultrasonic axial force management method is to keep the film thickness of the contact medium (water, oil, etc.) interposed between the ultrasonic sensor and the bolt end face constant during measurement. It is to be. Since the ultrasonic wave transit time measured is the total of the bolt length and the film thickness of the couplant, in order to measure the minute ultrasonic wave transit time due to the change in the sonic velocity and the size of the bolt due to the axial load. Therefore, it is necessary to prevent the thickness of the contact medium from fluctuating as much as possible. If the film thickness fluctuates, the measurement accuracy will deteriorate and the merit of the ultrasonic axial force management method will disappear.
（考案が解決しようとする課題） 前記従来の超音波式軸力管理方法は，軸力管理精度が高
い反面，ボルト両端面にアクセスできる例が非常に少な
い。また締め付け前後に軸力測定用プローブを用いて軸
力を計測する場合は，軸力に過不足が生じたとき，締め
付けの調整（再締め付け或いは緩め）が必要になる。ま
た締め付け前後で超音波センサの取付け位置及び接触媒
質の膜厚が微小に変動して，軸力の管理精度が低下する
という問題があった。(Problems to be Solved by the Invention) In the conventional ultrasonic axial force management method, although the axial force management accuracy is high, there are very few examples in which both end surfaces of the bolt can be accessed. Further, when the axial force is measured by using the axial force measuring probe before and after tightening, when the axial force becomes excessive or insufficient, it is necessary to adjust the tightening (re-tightening or loosening). In addition, there is a problem that the mounting position of the ultrasonic sensor and the film thickness of the contact medium fluctuate slightly before and after tightening, and the accuracy of axial force management deteriorates.
本考案は前記の問題点に鑑み提案するものであり，その
目的とする処は、ボルトを締めながら軸力を連続的にモ
ニタリングできる上に，軸力の管理精度を向上できる軸
力センサ付ボルト締付工具を提供しようとする点にあ
る。The present invention is proposed in view of the above problems, and an object of the present invention is to provide a bolt with an axial force sensor that can continuously monitor the axial force while tightening the bolt and improve the axial force management accuracy. The point is to provide a tightening tool.
（課題を解決するための手段） 上記の目的を達成するために，本考案の軸力センサ付ボ
ルト締付工具は，締付工具本体にセンサの外径よりも大
きい内径のセンサ収納部を設け、同センサ収納部の入口
にセンサの保持兼調心用テーパ部を設け、超音波センサ
を上記センサ収納部に収納して、同超音波センサに設け
たテーパ部を上記保持兼調心用テーパ部の内面に係合
し、同超音波センサのテーパ部と上記センサ収納部の奥
部との間にコイルばねを介装している。(Means for Solving the Problem) In order to achieve the above object, the bolt tightening tool with an axial force sensor of the present invention is provided with a sensor housing portion having an inner diameter larger than the outer diameter of the sensor in the tightening tool body. , A sensor holding / centering taper is provided at the entrance of the sensor housing, the ultrasonic sensor is housed in the sensor housing, and the taper provided on the ultrasonic sensor is held / centered by the taper. A coil spring is interposed between the taper portion of the ultrasonic sensor and the inner portion of the sensor housing portion while engaging with the inner surface of the portion.
（作用） 本考案の軸力センサ付ボルト締付工具は前記のように構
成されており、次の作用が行われる。即ち、超音波式軸
力管理方法でボルト軸力を精度良く測定するためには、
ボルト締付中に超音波センサをボルトの中心に固着した
状態に保持することが重要であるが、本考案の軸力セン
サ付ボルト締付工具では、締付工具本体の下端部に設け
た六角穴を締付対象ナツトに嵌合して、コイルばねの反
力と保持兼調心用テーパ部とにより超音波センサのテー
パ部をボルトの一端中心部（ボルト頭部）に圧着するの
で、超音波センサの調心機能がある。しかも超音波セン
サがボルトの一端中心部（ボルト頭部）にコイルばねを
介して圧着するものの、締付工具本体と超音波センサと
は独立した状態にあり、締付工具本体が超音波センサに
干渉せず、締付工具本体にガタ付きがあっても、超音波
センサとボルトとが固着状態に保持されるので、ボルト
を締めながら軸力を連続的にモニタリング可能である上
に、軸力の管理精度が向上する。(Operation) The bolt tightening tool with an axial force sensor of the present invention is configured as described above, and the following operations are performed. That is, in order to accurately measure the bolt axial force with the ultrasonic axial force management method,
It is important to keep the ultrasonic sensor firmly attached to the center of the bolt during bolt tightening.However, with the bolt tightening tool with axial force sensor of the present invention, the hexagonal hexagon provided at the lower end of the tightening tool body The hole is fitted into the nut to be tightened, and the taper part of the ultrasonic sensor is crimped to the center part (bolt head) of the bolt by the reaction force of the coil spring and the taper part for holding and aligning. Has the function of aligning the sound wave sensor. Moreover, although the ultrasonic sensor crimps to the center of one end of the bolt (bolt head) via the coil spring, the tightening tool body and the ultrasonic sensor are independent, and the tightening tool body becomes the ultrasonic sensor. Even if the tightening tool body has rattle without interference, the ultrasonic sensor and the bolt are held in a fixed state, so it is possible to continuously monitor the axial force while tightening the bolt. The management accuracy of is improved.
（実施例） 次に本考案の軸力センサ付ボルト締付工具を第１、２図
に示す一実施例により説明すると，（４）が締付工具本
体，即ち，ソケツトレンチ用ソケツトで，同締付工具本
体（４）の下端部には，締め付け対象ナツトの頭部に嵌
合可能な六角穴（4A）が設けられている。また同締付工
具本体（４）の上端部には，ラチエツトハンドル（７）
を取付ける四角穴（4B）が設けられている。また（4C）
が同締付工具本体（４）の下部内に設けられたセンサ収
納部，（4D）が同センサ収納部（4C）の入口部に形成さ
れたセンサの保持兼調心用ガイド部，（５）が上記セン
サ収納部（4C）に収納した超音波センサ，（5A）が同超
音波センサ（５）に設けられたテーパ部で，同テーパ部
（5A）が上記保持兼調心用ガイド部（1D）の内面に係合
するようになっている。また（5B）が上記超音波センサ
（５）から超音波軸力測定装置（図示せず）へ延びたリ
ード線，（６）が同超音波センサ（５）と上記センサ収
納部（4C）の奥部との間に介装したコイルばね，（８）
がボルト，（９）が同ボルト（８）に螺合したナツトで
ある。(Embodiment) Next, a bolt tightening tool with an axial force sensor of the present invention will be described with reference to an embodiment shown in FIGS. 1 and 2. (4) is a tightening tool body, that is, a socket for a socket The lower end of the tool body (4) is provided with a hexagonal hole (4A) that can be fitted to the head of the nut to be tightened. Further, the ratchet handle (7) is attached to the upper end of the tightening tool body (4).
A square hole (4B) for mounting is provided. Also (4C)
Is a sensor accommodating part provided in the lower part of the tightening tool body (4), (4D) is a sensor holding and aligning guide part (5) formed at the inlet part of the sensor accommodating part (4C). ) Is an ultrasonic sensor housed in the sensor housing part (4C), (5A) is a taper part provided in the ultrasonic sensor (5), and the taper part (5A) is the holding and aligning guide part. It is designed to engage with the inner surface of (1D). Further, (5B) is a lead wire extending from the ultrasonic sensor (5) to an ultrasonic axial force measuring device (not shown), and (6) is the ultrasonic sensor (5) and the sensor housing portion (4C). A coil spring interposed between the inner part and the inner part, (8)
Is a bolt, and (9) is a nut screwed to the bolt (8).
次に前記第2,3図に示す軸力センサ付ボルト締付工具の
作用を具体的に説明する。締付工具本体（４）の下端部
に設けた六角穴（4A）を締め付け対象ナツト（９）に嵌
合して，コイルばね（６）の反力と保持兼調心用ガイド
部（4D）とにより超音波センサ（５）をボルト（８）の
一端中心部に圧着して，軸力を測定する。Next, the operation of the bolt tightening tool with the axial force sensor shown in FIGS. 2 and 3 will be specifically described. The hexagonal hole (4A) provided at the lower end of the tightening tool body (4) is fitted into the nut (9) to be tightened, and the reaction force of the coil spring (6) and the holding and aligning guide part (4D) The ultrasonic sensor (5) is crimped to the center part of one end of the bolt (8) by and the axial force is measured.
（考案の効果） 本考案の軸力センサ付ボルト締付工具は前記のように構
成されており、次の効果を達成できる。即ち、超音波式
軸力管理方法でボルト軸力を精度良く測定するために
は、ボルト締付中に超音波センサをボルトの中心に固着
した状態に保持することが重要であるが、本考案の軸力
センサ付ボルト締付工具では、締付工具本体の下端部に
設けた六角穴を締付対象ナツトに嵌合して、コイルばね
の反力と保持兼調心用テーパ部とにより超音波センサの
テーパ部をボルトの一端中心部（ボルト頭部）に圧着す
るので、超音波センサの調心機能がる。しかも超音波セ
ンサがボルトの一端中心部（ボルト頭部）にコイルばね
を介して圧着するものの、締付工具本体と超音波センサ
とは独立した状態にあり、締付工具本体が超音波センサ
に干渉せず、締付工具本体にガタ付きがあっても、超音
波センサとボルトとが固着状態に保持されるので、ボル
トを締めながら軸力を連続的にモニタリングできる上
に、軸力の管理精度を向上できる効果がある。締付本体
の下端部に設けた六角穴を締付対象ナツトに嵌合して、
コイルばねの反力と保持兼調心用テーパ部とにより超音
波センサのテーパ部をボルトの一端中心部に圧着して、
軸力を測定するので、ボルトを締めながら軸力を連続的
にモニタリングできる上に、軸力の管理精度を向上でき
る効果がある。(Effects of the Invention) The bolt tightening tool with an axial force sensor of the present invention is configured as described above, and the following effects can be achieved. That is, in order to accurately measure the bolt axial force by the ultrasonic axial force management method, it is important to keep the ultrasonic sensor fixed to the center of the bolt while tightening the bolt. With the bolt tightening tool with axial force sensor, the hexagonal hole provided at the lower end of the tightening tool body is fitted to the nut to be tightened, and the reaction force of the coil spring and the taper for holding and Since the taper portion of the ultrasonic sensor is crimped to the center portion of one end of the bolt (head portion of the bolt), the ultrasonic sensor has a centering function. Moreover, although the ultrasonic sensor crimps to the center of one end of the bolt (bolt head) via the coil spring, the tightening tool body and the ultrasonic sensor are independent, and the tightening tool body becomes the ultrasonic sensor. Even if the tightening tool body has rattle without interference, the ultrasonic sensor and the bolt are held in a fixed state, so the axial force can be continuously monitored while tightening the bolt and the axial force can be managed. This has the effect of improving accuracy. Fit the hexagonal hole on the lower end of the tightening body into the nut to be tightened,
The taper of the ultrasonic sensor is crimped to the center of one end of the bolt by the reaction force of the coil spring and the taper for holding and aligning.
Since the axial force is measured, the axial force can be continuously monitored while tightening the bolts, and the axial force management accuracy can be improved.
第１図は本考案に係わる軸力センサ付ボルト締付工具の
一実施例を示す縦断側面図，第２図はその使用状態を示
す縦断側面図，第３図は従来の超音波式軸力管理方法の
原理を示す説明図，第４図は従来の超音波軸力測定用の
プローブを示す縦断側面図である。 （４）……締付工具本体、（4A）……六角穴、（4B）…
…四角穴、（4c）……センサ収納部、（4D）……センサ
の保護兼調心用テーパ部、（５）……超音波センサ、
（5A）……センサのテーパ部、（5B）……リード線、
（６）……コイルばね。FIG. 1 is a vertical sectional side view showing an embodiment of a bolt tightening tool with an axial force sensor according to the present invention, FIG. 2 is a vertical sectional side view showing its usage state, and FIG. 3 is a conventional ultrasonic axial force. FIG. 4 is an explanatory view showing the principle of the management method, and FIG. 4 is a vertical sectional side view showing a conventional probe for measuring ultrasonic axial force. (4) …… Tightening tool body, (4A) …… Hexagonal hole, (4B)…
… Square hole, (4c) …… Sensor housing, (4D) …… Taper part for sensor protection and alignment, (5) …… Ultrasonic sensor,
(5A) …… Sensor taper part, (5B) …… Lead wire,
(6) ... Coil spring.
Claims (1)
内径のセンサ収納部を設け、同センサ収納部の入口にセ
ンサの保持兼調心用テーパ部を設け、超音波センサを上
記センサ収納部に収納して、同超音波センサに設けたテ
ーパ部を上記保持兼調心用テーパ部の内面に係合し、同
超音波センサのテーパ部と上記センサ収納部の奥部との
間にコイルばねを介装したことを特徴とする軸力センサ
付ボルト締付工具。1. A tightening tool main body is provided with a sensor accommodating portion having an inner diameter larger than the outer diameter of the sensor, and a sensor retaining and aligning taper portion is provided at an inlet of the sensor accommodating portion. Between the taper part of the ultrasonic sensor and the back part of the sensor storage part, the taper part provided in the storage part is engaged with the inner surface of the holding and aligning taper part. A bolt tightening tool with an axial force sensor, characterized in that a coil spring is interposed in the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988158468U JPH074530Y2 (en) | 1988-12-07 | 1988-12-07 | Bolt tightening tool with axial force sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988158468U JPH074530Y2 (en) | 1988-12-07 | 1988-12-07 | Bolt tightening tool with axial force sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0279436U JPH0279436U (en) | 1990-06-19 |
| JPH074530Y2 true JPH074530Y2 (en) | 1995-02-01 |
Family
ID=31438825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988158468U Expired - Lifetime JPH074530Y2 (en) | 1988-12-07 | 1988-12-07 | Bolt tightening tool with axial force sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074530Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013185910A (en) * | 2012-03-07 | 2013-09-19 | Nippon Sharyo Seizo Kaisha Ltd | Positioning structure of ultrasonic probe |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04278429A (en) * | 1991-03-07 | 1992-10-05 | Tonichi Seisakusho:Kk | Holding device of sensor for measuring axial force of bolt by ultrasonic wave |
| JP2004093477A (en) * | 2002-09-03 | 2004-03-25 | Isuzu Motors Ltd | Ultrasonic bolt axial force meter |
| FR2993488B1 (en) * | 2012-07-18 | 2014-08-22 | Michel Berbesson | TOOLING ASSEMBLY FOR CLAMPING / LOOSENING |
| JP6971829B2 (en) * | 2017-12-21 | 2021-11-24 | 株式会社きんでん | Axial force measuring device |
| JP6823625B2 (en) | 2018-08-03 | 2021-02-03 | 本田技研工業株式会社 | Tightening device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5273781A (en) * | 1975-12-17 | 1977-06-21 | Hitachi Ltd | Ultrasonic tightening measuring device |
| DE2853988A1 (en) * | 1978-12-14 | 1980-07-17 | Maschf Augsburg Nuernberg Ag | METHOD FOR INDIRECTLY MEASURING THE BOLT TENSION |
-
1988
- 1988-12-07 JP JP1988158468U patent/JPH074530Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013185910A (en) * | 2012-03-07 | 2013-09-19 | Nippon Sharyo Seizo Kaisha Ltd | Positioning structure of ultrasonic probe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0279436U (en) | 1990-06-19 |
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