JPH0621858U - Bolt tightening device - Google Patents
Bolt tightening deviceInfo
- Publication number
- JPH0621858U JPH0621858U JP2550992U JP2550992U JPH0621858U JP H0621858 U JPH0621858 U JP H0621858U JP 2550992 U JP2550992 U JP 2550992U JP 2550992 U JP2550992 U JP 2550992U JP H0621858 U JPH0621858 U JP H0621858U
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- Prior art keywords
- tightening
- nut
- motor
- bolt
- tightened
- Prior art date
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Abstract
(57)【要約】
【目的】 電動レンチのなじみ性の変動の影響を受ける
ことなく、ボルト・ナットの開始点を正確に検出して、
一定した正確な締付け力で本締めできるボルト締付け装
置の提供
【構成】 被締付け部材（１）に仮締めされたボルト
（２）とナット（３）を、ナット（３）を所定角度回転
させて本締めするモ−タ（５）内蔵の電動レンチ（４）
と、その駆動制御部（６）を備える。駆動制御部（６）
は、モ−タ（５）の駆動電流を微分する微分回路（７）
と、この微分回路（７）の微分値ｄＶ／ｄθと所定レベ
ル値Ｅとの比較でナット（３）の開始点Ｐを検知して、
ナット（３）の本締めを開始させる開始点検出回路
（８）とを備える。ナット（３）の本締めは、開始点Ｐ
の検出時点から所定の角度だけ回転させる回転角法など
で行われる。
(57) [Abstract] [Purpose] Accurately detect the starting points of bolts and nuts without being affected by the fluctuation in the compatibility of electric wrenches.
Providing a bolt tightening device that can be fully tightened with a constant and accurate tightening force [Configuration] A bolt (2) and a nut (3) temporarily tightened on a member to be tightened (1) are rotated by a predetermined angle. Electric wrench (4) with built-in motor (5) for final tightening
And its drive control section (6). Drive controller (6)
Is a differentiation circuit (7) for differentiating the drive current of the motor (5)
Then, the starting point P of the nut (3) is detected by comparing the differential value dV / dθ of the differentiating circuit (7) with the predetermined level value E,
A starting point detection circuit (8) for starting the final tightening of the nut (3). The final tightening of the nut (3) is P
Is performed by a rotation angle method or the like in which it is rotated by a predetermined angle from the time point of detection.
Description
【０００１】[0001]
本考案は、鉄骨の橋梁やビルなどの鉄骨部材同士をボルト・ナット締めする電 動式のボルト締付け装置で、詳しくは、トルクレンチ等によりハイテンションボ ルトとナットで被締付け部材を仮締めした後に、このナットを本締めする電動レ ンチを有するボルト締付け装置に関する。 The present invention is an electric bolt tightening device that tightens bolts and nuts between steel frame members such as steel bridges and buildings. Specifically, the tightened member is temporarily tightened with a high tension bolt and nut using a torque wrench. The present invention relates to a bolt tightening device having an electric wrench for tightening this nut later.
【０００２】[0002]
橋梁の鉄骨部材同士の連結は、被連結部分の複数箇所をボルトとナットで仮締 め（一次締め）してから、複数箇所のナットを順次に本締めすることで行われる 。ボルトとナットの仮締めは、トルクレンチなどを使って行われ、仮締め後の本 締めは、モ−タや減速機を内蔵した電動レンチを使って行われる。鉄骨部材同士 をハイテンションボルトで連結する際に使用される電動レンチの具体例を、図３ を参照して説明する。 The steel frame members of the bridge are connected to each other by temporarily tightening the bolts and nuts (primary tightening) at multiple points on the part to be connected, and then sequentially tightening the nuts at multiple points. Temporary tightening of bolts and nuts is performed using a torque wrench, etc., and final tightening after temporary tightening is performed using an electric wrench with a built-in motor and speed reducer. A specific example of the electric wrench used for connecting the steel frame members to each other with the high tension bolt will be described with reference to FIG.
【０００３】 図３は、鉄骨の被締付け部材（１）の複数箇所に仮締めされたボルト（ハイテ ンションボルト）（２）とナット（３）、及び、ナット（３）を１つずつ本締め する電動レンチ（４）を示す。電動レンチ（４）は、モ−タ（５）を収納する本 体（10）と、減速ギヤからなる減速機（11）、及び、回転ヘッド（12）を連結し て構成される。回転ヘッド（12）は、外周に突起状の反力受け（13）を一体に有 し、内部にナット（３）に嵌合して回転させるソケット（図示せず）を有する。 回転ヘッド（12）のソケットをナット（３）に嵌合させ、電源投入でモ−タ（５ ）を駆動させ、減速機（11）を介して回転ヘッド（12）を回転させると、反力受 け（13）が隣のナット（３）に当った時点からナット（３）の本締めが行われる 。ナット（３）の本締めは、ナット（３）の本締め開始点を検知し、この開始点 から予め設定された１２０度などの所定角度だけ回転させるナット回転角法で行 われる。FIG. 3 shows bolts (hightation bolts) (2) and nuts (3) temporarily tightened at a plurality of locations on a steel frame tightening member (1), and one nut (3) is fully tightened. 2 shows an electric wrench (4) for use. The electric wrench (4) is configured by connecting a main body (10) that houses the motor (5), a speed reducer (11) including a reduction gear, and a rotary head (12). The rotary head (12) integrally has a protrusion-like reaction force receiver (13) on the outer periphery, and has a socket (not shown) inside which is fitted into the nut (3) to rotate. When the socket of the rotary head (12) is fitted to the nut (3), the motor (5) is driven by turning on the power, and the rotary head (12) is rotated through the speed reducer (11), the reaction force is generated. The nut (3) is fully tightened from the time when the receiver (13) hits the adjacent nut (3). The main tightening of the nut (3) is performed by a nut rotation angle method in which the start point of the main tightening of the nut (3) is detected and the nut (3) is rotated by a predetermined angle such as 120 degrees preset from the start point.
【０００４】 上記ナット（３）の開始点の検出は、モ−タ（５）の駆動電流Ｉが所定のレベ ルに達した時点の検出で行われている。すなわち、モ−タ（５）の駆動電流Ｉと ナット（３）の回転角θは、図４の波形Ａに示すような関係にある。電動レンチ （４）の電源投入で流れる駆動電流Ｉの波形は、急激な立上りと立下りをする起 動波形域（ｍ）と、ナット（３）が回転して着座点Ｐに達して上昇する締付け波 形域（ｎ）に分けられる。締付け波形域（ｎ）の駆動電流Ｉと、ボルト（２）と ナット（３）による被締付け部材（１）の締付けトルクは、開始点Ｐ以後は、略 比例関係にある。そこで、駆動電流Ｉを電圧変換などして検出し、その検出信号 が着座点Ｐに相当する所定の電圧レベルＱに達した時点を検出して、この検出時 点からナット（３）を回転角法で本締めし、所定の締め付けトルクを得ている。The detection of the starting point of the nut (3) is performed at the time when the drive current I of the motor (5) reaches a predetermined level. That is, the drive current I of the motor (5) and the rotation angle θ of the nut (3) have a relationship as shown by the waveform A in FIG. The waveform of the drive current I flowing when the power of the electric wrench (4) is turned on rises when it reaches the seating point P by the rotation waveform region (m) of rapid rising and falling and the nut (3) rotating. It is divided into the tightening wave area (n). The driving current I in the tightening waveform region (n) and the tightening torque of the member to be tightened (1) by the bolt (2) and the nut (3) are in a substantially proportional relationship after the starting point P. Therefore, the drive current I is detected by voltage conversion or the like, and the time when the detection signal reaches a predetermined voltage level Q corresponding to the seating point P is detected. From this detection time, the rotation angle of the nut (3) is changed. Method is used for final tightening to obtain the specified tightening torque.
【０００５】[0005]
上記のようにボルト・ナットの本締め開始点を所定の電圧レベルＱを基準とし て検出し、所定角度だけナットを本締めするボルト締付け装置は、締め付け条件 によって開始点を表わす電圧レベルＱの大きさが変動し、正確な締め付けができ ない問題があった。これは電動レンチの使用頻度や温度変化による回転軸と軸受 けのなじみ性の変動、あるいは経年変化により、駆動電流と締付け力との関係が 変化するからである。 As described above, the bolt tightening device that detects the starting tightening start point of bolts and nuts with reference to a predetermined voltage level Q and then tightens the nuts by a predetermined angle is the magnitude of the voltage level Q that represents the starting point depending on the tightening conditions. However, there was a problem that the tightening could not be done accurately due to fluctuations in the thickness. This is because the relationship between the drive current and the tightening force changes due to changes in the compatibility of the rotating shaft and bearing due to changes in the operating frequency and temperature of the electric wrench, or changes over time.
【０００６】 例えば、橋梁などの鉄骨部材のように、複数箇所に仮締めされた複数のボルト にナットを１つずつ電動レンチで順に本締めしていく場合、始めのボルトにナッ トを締付けるときの電動レンチのグリス粘度などによる回転のなじみ性と、終わ りのボルトにナットを締付けるときの電動レンチのなじみ性は、自ずと異なる。 換言すると、電動レンチは、使用回数が増えるほど、よりなじみ性が良くなり、 よりスム−ズに回転する。また、電動レンチのなじみ性は、冬と夏、朝と昼など の周囲温度にも影響を受けて変動する。このような電動レンチのなじみ性の変動 は、モ−タの駆動電流に影響を及ぼす。例えば、電動レンチで多数のボルトを順 次に締付けていくほど、モ−タの駆動電流は、図４の破線波形に示すように、開 始点Ｐの付近で下がる変動をする。そのため、駆動電流Ｉの検出と、所定の基準 レベルＱの比較で検出される開始点Ｐ´は、先の開始点Ｐより遅れて検出され、 遅れた開始点Ｐ´から本締めを開始すると、最終締付け力が過大となる等の不都 合が生じることがある。For example, when tightening nuts one by one with an electric wrench one by one to a plurality of bolts temporarily tightened at multiple places such as a steel frame member such as a bridge, when tightening the nut to the first bolt The familiarity of rotation of the electric wrench due to the grease viscosity, etc. and the familiarity of the electric wrench when tightening the nut to the final bolt are naturally different. In other words, as the electric wrench is used more frequently, the electric wrench becomes more compatible and rotates more smoothly. In addition, the familiarity of the electric wrench changes depending on the ambient temperature such as winter and summer, morning and day. Such a change in the compatibility of the electric wrench affects the drive current of the motor. For example, as a large number of bolts are tightened in sequence with an electric wrench, the motor drive current fluctuates near the start point P as shown by the broken line waveform in FIG. Therefore, the start point P'detected by the detection of the drive current I and the comparison of the predetermined reference level Q is detected later than the previous start point P, and when the final tightening is started from the delayed start point P ', In some cases, the final tightening force may become excessively large.
【０００７】 それ故に、本考案の目的とするところは、電動レンチのなじみ性の変動に関係 なく開始点を正確に検出して、常に正常な締付け力でボルト・ナットの本締めを 行う、信頼性の高いボルト締付け装置を提供することにある。Therefore, the object of the present invention is to accurately detect the starting point regardless of the change in the conformability of the electric wrench and always perform the final tightening of the bolts and nuts with the normal tightening force. It is to provide a bolt tightening device having high performance.
【０００８】[0008]
本考案は、ボルトと共有して被締付け部材を仮締めしたナットを、本締めする モ−タ内蔵の電動レンチと、そのモ−タの駆動制御部を備えた装置であって、電 動レンチのモ−タの駆動電流を微分する微分回路と、この微分回路の微分値と所 定レベル値との比較でナットの本締め開始点を検知して、ナットの本締めを開始 させる開始点検出回路とを前記駆動制御部に組込んだことにより、上記目的を達 成する。 The present invention is an electric wrench that includes an electric wrench with a built-in motor that permanently tightens a nut that temporarily tightens a member to be tightened in common with a bolt, and a drive control unit for the motor. Differentiation circuit that differentiates the drive current of the motor, and the starting point for starting the final tightening of the nut is detected by detecting the starting point of the final tightening of the nut by comparing the differential value of this differentiating circuit with the predetermined level value. The above object is achieved by incorporating a circuit and the drive control unit.
【０００９】[0009]
被締付け部材にボルトとナットを仮締めし、ナットを電動レンチで締付ける場 合のナットの本締め開始点における駆動電流は、起動波形域の立ち下がりと締め 付け波形域の立ち上りの境界となり、傾きが０になる。この部分は電動レンチの なじみ性の変動により高さ変化があっても傾きは一定であり、この開始点でのモ −タ駆動電流の微分波形はゼロレベルをほぼ直交する垂直波形となる。従って、 駆動電流の微分値が、ゼロレベル付近の所定のレベルに達した時点を開始点とし て検出すれば、検出される開始点の精度は、電動レンチのなじみ性の変動の影響 を受けず一定となり、開始点検出後の本締めが正常に行われる。 When temporarily tightening the bolt and nut on the member to be tightened and tightening the nut with an electric wrench, the drive current at the starting point of the final tightening of the nut becomes the boundary between the falling of the starting waveform range and the rising of the tightening waveform range, and Becomes 0. The slope of this portion is constant even if the height changes due to the change in the conformability of the electric wrench, and the differential waveform of the motor drive current at this starting point is a vertical waveform that is almost orthogonal to the zero level. Therefore, if the starting point is the time when the differential value of the drive current reaches a predetermined level near zero level, the accuracy of the starting point will not be affected by the fluctuation of the familiarity of the electric wrench. It becomes constant, and the final tightening is normally performed after the start point is detected.
【００１０】[0010]
図１に本考案装置の具体的回路のブロック図を、図２にその動作波形図を示し 、以下、同図を参照して本考案を説明する。 FIG. 1 shows a block diagram of a specific circuit of the device of the present invention, and FIG. 2 shows an operation waveform diagram thereof. Hereinafter, the present invention will be described with reference to the same drawing.
【００１１】 図１は、図３の電動レンチ（４）の駆動制御部（６）のブロック図で、駆動制 御部（６）は、微分回路（７）と開始点検出回路（８）、及び、本締め制御回路 （９）を備える。電動レンチ（４）のモ−タ（５）は、手動のスイッチ（14）の 操作による電源（15）の投入で駆動して、減速機（11）を介して回転ヘッド（12 ）を回転させ、被締付け部材（１）に仮締めされたボルト（２）のナット（３） を回転させる。モ−タ（５）の回転軸は高速回転し、その回転角は角度検出器（ 16）で検出されて、本締め制御回路（９）に送られる。角度検出器（16）は、例 えばパルスエンコ−ダで、モ−タ（５）の回転軸の回転角をパルス信号で検出し 、パルス信号を本締め制御回路（９）に出力する。本締め制御回路（９）は、角 度検出器（16）からのパルス信号を演算処理し易いパルス角度信号に変換するパ ルス角度変換回路（20）と、これからのパルス角度信号をカウントするカウンタ −（21）と、第２の比較器（22）、及び、本締め角度設定器（23）を有し、これ らの機能は後述する。FIG. 1 is a block diagram of a drive control unit (6) of the electric wrench (4) shown in FIG. 3. The drive control unit (6) includes a differentiating circuit (7), a start point detecting circuit (8), And a final tightening control circuit (9). The motor (5) of the electric wrench (4) is driven by turning on the power supply (15) by operating the manual switch (14) to rotate the rotary head (12) through the speed reducer (11). , The nut (3) of the bolt (2) temporarily tightened on the member to be tightened (1) is rotated. The rotation shaft of the motor (5) rotates at a high speed, and its rotation angle is detected by the angle detector (16) and sent to the final tightening control circuit (9). The angle detector (16) is, for example, a pulse encoder, detects the rotation angle of the rotary shaft of the motor (5) with a pulse signal, and outputs the pulse signal to the final tightening control circuit (9). The final tightening control circuit (9) includes a pulse angle conversion circuit (20) that converts the pulse signal from the angle detector (16) into a pulse angle signal that can be easily processed, and a counter that counts the pulse angle signal from this pulse angle signal. -(21), a second comparator (22), and a final tightening angle setting device (23), and their functions will be described later.
【００１２】 駆動制御部（６）の微分回路（７）は、モ−タ（５）の駆動電流Ｉを微分する もので、例えば駆動電流Ｉを変流器（17）で検出した電圧Ｖの微分値ｄＶ／ｄθ で検出する。駆動電流Ｉの波形は、図２の波形Ａに示すように、起動電流の起動 波形域（ｍ）と締付け波形域（ｎ）からなり、この駆動電流Ｉを微分した微分値 ｄＶ／ｄθの波形は、図２の波形Ｂに示すように表れる。この微分波形Ｂの内の 、駆動電流Ｉの起動波形域（ｍ）に相当する起動微分波形ｂをカットした微分値 ｄＶ／ｄθが開始点検出回路（８）に出力されて、開始点検出のための所定の電 圧レベルＥと比較され、ナット（３）の開始点Ｐが検出される。開始点検出回路 （８）は、微分回路（７）からの微分信号を所定の電圧レベルＥと比較する第１ の比較器（18）と、第１の比較器（18）への電圧レベルＥを任意に設定するスタ −ト検出レベル設定器（19）を備える。第１の比較器（18）からの信号は、本締 め制御回路（９）のカウンタ−（21）にカウント開始信号として出力される。The differentiating circuit (7) of the drive control unit (6) differentiates the drive current I of the motor (5). For example, the drive current I of the voltage V detected by the current transformer (17) The differential value dV / dθ is detected. The waveform of the drive current I is, as shown in the waveform A of FIG. 2, composed of the start waveform region (m) of the start current and the tightening waveform region (n), and the waveform of the differential value dV / dθ obtained by differentiating the drive current I. Appears as shown by the waveform B in FIG. Of this differential waveform B, the differential value dV / dθ obtained by cutting the startup differential waveform b corresponding to the startup waveform region (m) of the drive current I is output to the start point detection circuit (8) to detect the start point. And a starting point P of the nut (3) is detected. The start point detection circuit (8) includes a first comparator (18) for comparing the differentiated signal from the differentiating circuit (7) with a predetermined voltage level E, and a voltage level E for the first comparator (18). Equipped with a start detection level setter (19) for arbitrarily setting. The signal from the first comparator (18) is output as a count start signal to the counter (21) of the final tightening control circuit (9).
【００１３】 上記駆動電流Ｉの開始点Ｐ近傍に対応する微分値ｄＶ／ｄθの波形は、ゼロレ ベルをほぼ直交する略垂直波形であり、微分値ｄＶ／ｄθとゼロレベルのクロス 点の回転角θの位置は、電動レンチ（４）のなじみ性に関係なく一定である。そ こで、微分値ｄＶ／ｄθとゼロレベルのクロス点を開始点として検出するように すればよいのであるが、駆動制御部（６）の各種回路素子による信号処理の遅れ などのを回路特性を見越し、これを補正するように、微分値ｄＶ／ｄθをゼロレ ベルより少し下げた所定の電圧レベルＥと比較して、開始点Ｐを検出するように する。つまり、第１の比較器（18）で微分値ｄＶ／ｄθと電圧レベルＥを比較し 、微分値ｄＶ／ｄθが電圧レベルＥを超えた時点をナット（３）の開始点Ｐとし て検出し、カウンタ−（21）にカウント開始信号を出力する。このように検出さ れた開始点Ｐに対応するナット回転角θは、電動レンチ（４）のなじみ性に関係 なく一定である。The waveform of the differential value dV / dθ corresponding to the vicinity of the starting point P of the drive current I is a substantially vertical waveform that is substantially orthogonal to the zero level, and the rotation angle of the cross point of the differential value dV / dθ and the zero level. The position of θ is constant regardless of the conformability of the electric wrench (4). Then, it suffices to detect the differential value dV / dθ and the zero-level crossing point as the starting point. However, delays in signal processing by the various circuit elements of the drive control unit (6) can be considered as circuit characteristics. In anticipation, in order to correct this, the differential value dV / dθ is compared with a predetermined voltage level E slightly lower than zero level, and the starting point P is detected. That is, the first comparator (18) compares the differential value dV / dθ with the voltage level E, and the time when the differential value dV / dθ exceeds the voltage level E is detected as the starting point P of the nut (3). , And outputs a count start signal to the counter (21). The nut rotation angle θ corresponding to the start point P thus detected is constant regardless of the conformability of the electric wrench (4).
【００１４】 カウンタ−（21）に第１の比較器（18）からカウント開始信号が入力されると 、カウンタ−（21）はパルス角度変換回路（20）からのモ−タ（５）の回転角に 相当するパルスをカウントする。このカウント値が本締め角度設定器（23）で設 定された値になると、第２の比較器（22）がモ−タ駆動停止信号Ｓを出力して、 モ−タ（５）が停止する。モ−タ（５）は、開始点Ｐの検出から本締め角度設定 器（23）で予め設定された１２０度等の所定角度だけ回転して停止し、ナット（ ３）の本締めが完了する。この本締めにおけるボルト（２）とナット（３）の締 付けトルクＴは、図２の波形Ｃに示すように、開始点Ｐの検出から上昇する。When the count start signal is input to the counter (21) from the first comparator (18), the counter (21) rotates the motor (5) from the pulse angle conversion circuit (20). Count the pulses corresponding to the corners. When this count value reaches the value set by the final tightening angle setting device (23), the second comparator (22) outputs the motor drive stop signal S and the motor (5) stops. To do. The motor (5) is rotated by a predetermined angle such as 120 degrees preset by the final tightening angle setting device (23) from the detection of the starting point P to stop, and the final tightening of the nut (3) is completed. . The tightening torque T of the bolt (2) and the nut (3) in this final tightening rises from the detection of the starting point P, as shown by the waveform C in FIG.
【００１５】[0015]
本考案によれば、被締付け部材に仮締めされたナットの開始点におけるナット 回転角は、電動レンチのなじみ性に変動があってもほぼ一定であり、開始点での モ−タ駆動電流の微分波形はゼロレベルをほぼ直交する波形となり、従って、駆 動電流の微分値が、ゼロレベル付近の所定のレベルに達した時点を開始点として 検出すると、電動レンチのなじみ性の変動の影響を受け無い、常に精度の良い開 始点検出が実行できる。その結果、開始点検出後の本締めが常に正常に行われ、 安定した最終締付け力によるボルト締付けが可能な、信頼性の高いボルト締付け 装置が提供できる。特に、橋梁などの鉄骨部材同士を複数箇所でボルト締めする ような部所において、ボルトの数が多くても、これを均一な締付け力で締付ける ことができ、複数のボルト締めの信頼性を一段と向上させる上で効果がある。 According to the present invention, the nut rotation angle at the starting point of the nut temporarily tightened on the member to be fastened is almost constant even if the conformability of the electric wrench changes, and the motor drive current at the starting point is The differential waveform is a waveform that is almost orthogonal to the zero level.Therefore, when the time when the differential value of the driving current reaches a predetermined level near the zero level is detected as the starting point, the influence of the fluctuation in the familiarity of the electric wrench is detected. It is possible to detect the start point with high accuracy. As a result, it is possible to provide a highly reliable bolt tightening device in which the main tightening is always normally performed after the start point is detected, and the bolt can be tightened with a stable final tightening force. In particular, at locations where steel members such as bridges are bolted at multiple points, even if the number of bolts is large, they can be tightened with a uniform tightening force, further improving the reliability of bolt tightening. Effective in improving.
【図１】本考案の実施例を示す電動レンチ駆動制御部の
ブロック図FIG. 1 is a block diagram of an electric wrench drive control unit showing an embodiment of the present invention.
【図２】図１のボルト締め装置の駆動制御部での回転角
と駆動電流、回転角と微分値、回転角と締付けトルクの
関係を示す波形図FIG. 2 is a waveform diagram showing a relationship between a rotation angle and a drive current, a rotation angle and a differential value, and a rotation angle and a tightening torque in a drive control unit of the bolt tightening device of FIG.
【図３】電動レンチの具体例を示す側面図FIG. 3 is a side view showing a specific example of an electric wrench.
【図４】図３の電動レンチのモ−タ駆動電流と回転角の
関係を示す波形図4 is a waveform diagram showing a relationship between a motor drive current and a rotation angle of the electric wrench shown in FIG.
１ 被締付け部材 ２ ボルト ３ ナット ４ 電動レンチ ５ モ−タ ６ 駆動制御部 ７ 微分回路 ８ 開始点検出回路 1 Tightened member 2 Bolt 3 Nut 4 Electric wrench 5 Motor 6 Drive control unit 7 Differentiation circuit 8 Start point detection circuit
Claims (1)
したナットを本締めするモ−タ内蔵の電動レンチと、前
記モ−タの駆動制御部を備えた装置であって、 前記駆動制御部は、前記モ−タの駆動電流を微分する微
分回路と、この微分回路の微分値と所定レベル値との比
較でナットの本締め開始点を検知して、ナットの本締め
を開始させる開始点検出回路とを含むことを特徴とする
ボルト締付け装置。1. An apparatus comprising an electric wrench with a built-in motor for permanently tightening a nut that temporarily tightens a member to be tightened in common with a bolt, and a drive control section for the motor. The section detects the final tightening start point of the nut by comparing the differential value of the motor drive current with the differential value of the differential circuit and a predetermined level value, and starts the final tightening of the nut. A bolt tightening device including a point detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992025509U JP2583469Y2 (en) | 1992-03-25 | 1992-03-25 | Bolt tightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992025509U JP2583469Y2 (en) | 1992-03-25 | 1992-03-25 | Bolt tightening device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0621858U true JPH0621858U (en) | 1994-03-22 |
| JP2583469Y2 JP2583469Y2 (en) | 1998-10-22 |
Family
ID=12168038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992025509U Expired - Fee Related JP2583469Y2 (en) | 1992-03-25 | 1992-03-25 | Bolt tightening device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2583469Y2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564391A (en) * | 1979-06-21 | 1981-01-17 | Toshiba Corp | Laser working method |
| JPS5623756A (en) * | 1979-07-31 | 1981-03-06 | Nec Corp | Ceramic package and manufacture thereof |
| JPS6056871A (en) * | 1983-09-06 | 1985-04-02 | 東京貿易株式会社 | Method of clamping bolt and nut |
| JPS61103784A (en) * | 1984-10-27 | 1986-05-22 | マツダ株式会社 | Screwing controller for screw member |
-
1992
- 1992-03-25 JP JP1992025509U patent/JP2583469Y2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS564391A (en) * | 1979-06-21 | 1981-01-17 | Toshiba Corp | Laser working method |
| JPS5623756A (en) * | 1979-07-31 | 1981-03-06 | Nec Corp | Ceramic package and manufacture thereof |
| JPS6056871A (en) * | 1983-09-06 | 1985-04-02 | 東京貿易株式会社 | Method of clamping bolt and nut |
| JPS61103784A (en) * | 1984-10-27 | 1986-05-22 | マツダ株式会社 | Screwing controller for screw member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2583469Y2 (en) | 1998-10-22 |
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