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EP0925155B1 - Cle dynamometrique - Google Patents

Cle dynamometrique Download PDF

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Publication number
EP0925155B1
EP0925155B1 EP97932810A EP97932810A EP0925155B1 EP 0925155 B1 EP0925155 B1 EP 0925155B1 EP 97932810 A EP97932810 A EP 97932810A EP 97932810 A EP97932810 A EP 97932810A EP 0925155 B1 EP0925155 B1 EP 0925155B1
Authority
EP
European Patent Office
Prior art keywords
torque
torque wrench
angle
rotation
evaluation device
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
Application number
EP97932810A
Other languages
German (de)
English (en)
Other versions
EP0925155A1 (fr
Inventor
Heinz Schönberger
Frank Humme
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.)
Prosperas GmbH
Original Assignee
Saltus Werk Max Forst GmbH
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 Saltus Werk Max Forst GmbH filed Critical Saltus Werk Max Forst GmbH
Priority to DE29724239U priority Critical patent/DE29724239U1/de
Publication of EP0925155A1 publication Critical patent/EP0925155A1/fr
Application granted granted Critical
Publication of EP0925155B1 publication Critical patent/EP0925155B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • the invention relates to a torque wrench the features of the preamble of claim 1.
  • the beginning of the Determination of the deflection angle is determined automatically.
  • the type of temporal integration of the measured values depends on the overall design of the evaluation device and especially from the issue of Accelerometer readings. So can the integration by means of differential amplifiers in a known manner Way if the evaluation of the measured values is analog he follows.
  • a microprocessor is provided, for example, an evaluation can also take place digitally and there are various numerical integration methods available with which the microprocessor then is programmable.
  • Suitable acceleration sensors are known and customary in the trade. Preferably used are such acceleration sensors, which in one defined distance to the swivel axis in the torque wrench are arranged and which the pivot axis of the torque wrench as a virtual fixed point serves.
  • the preferred arrangement has the advantage that here no measurement between fixed and key-fixed Components.
  • a deflection angle to understand the proportion of the angle of rotation, which is usually from defined initial conditions a zero angle position such as one spatial position of the torque wrench to a housing begins to count and with the end of the tightening process or control process also ends.
  • the acceleration sensor detects an angular acceleration in the tightening direction for example a screw both positive and can also be negative, but still with the screw is attracted to a positive torque.
  • an angular acceleration in the tightening direction for example a screw both positive and can also be negative, but still with the screw is attracted to a positive torque.
  • torque when using a ratchet or ratchet or the angular velocity negative, namely counter in returning the torque wrench tightening direction this may be from the torque wrench swept angular range not taken into account as it doesn't tighten the screw contributes.
  • measured values of the Acceleration sensor only in a definable direction of rotation be evaluated.
  • the evaluation device with each a lower and an upper torque limit and a deflection angle is preprogrammable and that the evaluation device between the respective Actual values lying within the limit values.
  • Fig. 1 shows the essential components of a torque wrench 1 according to the invention. To put one on Screw, a nut or the like about an axis of rotation 2, it has an insertion tool 3, which on the Torque wrench 1 via a conventional plug-in receptacle is held.
  • the torque wrench 1 is guided around the axis of rotation 2 over an angular range ⁇ .
  • a clockwise rotation angle ⁇ and a torque applied in this direction are counted positively.
  • the counting direction can be reversed, for example, for screws with a left-hand thread.
  • the angular velocity ⁇ ⁇ and the angular acceleration also count accordingly clockwise positive.
  • the torque wrench 1 has an electronic Evaluation device 5 for the evaluation of sensors delivered measured values for acquisition or calculation of the torque M and the angle of rotation ⁇ .
  • a keypad 6 is used to program one, for example Microprocessor of the evaluation device and in particular the entry of limit values for the rotation or Deflection angle ⁇ or the torque M. Reaching or exceeding such limit values is indicated by a LED line 7 is displayed.
  • Final values of the torque M or of the angle of rotation or deflection ⁇ , ⁇ are on one LCD display 8 reproduced.
  • the torque M is measured and evaluated after known methods.
  • an acceleration sensor 9 in the torque wrench 1 for detecting the angle of rotation acceleration provided, which is arranged within the torque wrench 1 at a defined distance s from the axis of rotation 2.
  • the pivot axis 2 serves the acceleration sensor 9 as a virtual fixed point about which it is then also pivoted. This distance s is essentially determined by the design of the acceleration sensor 9 used, which is customary in the trade.
  • the torque wrench can be connected via a connector 10 1 via a common interface, for example with a computer 11 and / or a printer 12 for Logging of measurements must be connected.
  • step 15 switching on is carried out in step 16 by the evaluation device 5 a self test and zeroing automatically carried out.
  • step 16 a self test and zeroing automatically carried out.
  • step 16 a self test and zeroing automatically carried out.
  • step 16 a calibration of the torque wrench 1 to provide.
  • a separate calibration for the rotation angle measurement can for example, that the torque wrench 1 is set and the memory for the Angle of rotation is manually set to zero. Then the torque wrench 1 to his Rotation axis 2 over a defined angular range pivoted, which is then also from the evaluation device is to be displayed.
  • step 16 the parameters for the measuring process are set in step 17. Regardless of the order, these are initially the starting torque M s .
  • the starting torque M s can of course also be set to zero, with which the angle of rotation ⁇ and the deflection angle ⁇ then coincide.
  • a starting torque M s greater than zero is selected here, which is predetermined by the application.
  • a lower and an upper limit value for the torque are to be set as minimum and maximum values M min , M max , which define the torque range in which the final torque value reached is to be found in order when a screw or the like is tightened.
  • minimum and maximum values ⁇ min , ⁇ max are to be specified in which angular range the deflection angle, counting starting with the starting torque M s , has to be at the end of the measurement.
  • This setpoint specification also includes the choice of the measurement itself. For example, switching off one or the other measuring device can measure the torque M or measure the angular acceleration also done.
  • step 17 the torque key is then, for example, controlled manually or by one of the sensors with the measurement of the torque M and the angular acceleration began. These measurements according to steps 18, 19 take place continuously over the entire tightening process, for example of a screw.
  • step 20 the measurement result of the torque is checked to determine whether it is greater than or equal to the starting torque M s . As long as the determined torque is less than this value, the torque measurement is continued as normal.
  • the result of the acceleration measurement is checked regularly in step 21, namely whether the direction of rotation coincides with the tightening direction of, for example, a nut.
  • the angular velocity ⁇ ⁇ must be greater than zero.
  • This query criterion can be seen here alternatively, since, for example, the occurrence of a negative torque would also indicate that the direction of rotation was reversed, for example when using a ratchet or ratchet. If there is such a return movement of the torque wrench 1, the measured acceleration value becomes not further processed and in particular not added to the angle of rotation ⁇ in the tightening direction. The acceleration measurement however, continues as normal.
  • step 21 If it is determined in step 21 that there is a pivoting movement of the torque wrench 1 in the tightening direction, ie here that the angular velocity ⁇ ⁇ is greater than zero, the angular acceleration is integrated twice over time.
  • Various methods are available for this. In the case of analog integration, for example via differential amplifiers, the measured values are continuously evaluated.
  • An alternative possibility is to program, for example, a microprocessor present in the evaluation circuit 5, which then uses individual measured values as support values for a numerical integration.
  • the microprocessor can save all measured values as base values and use them to calculate the angle of rotation ⁇ for the current, last measurement.
  • the determination of the deflection angle ⁇ begins, cf. also FIG. 4.
  • Alternative methods are also available here.
  • the current numerical value of ⁇ ie the rotation angle swept up to this point in time, can be set to zero in step 23. Since the acceleration measurement is continued continuously, stored intermediate values can be used, for example, and the acceleration measurement can also be determined by integrating the deflection angle ⁇ . Alternatively, it would be possible to save the value of ⁇ present when the starting torque M s is exceeded and then subtract it from the end value of the angle of rotation measurement in order to determine the deflection angle ⁇ .
  • the aim of tightening a screw or the like by means of a torque wrench 1 according to the invention is for the torque to ultimately lie between predetermined limit values M min , M max or the deflection angle between limit values ⁇ min , ⁇ max after tightening the screw.
  • M min , M max or the deflection angle between limit values ⁇ min , ⁇ max after tightening the screw This is explained further on the basis of the flow chart according to FIG. 3.
  • both the torque measurement 18 and the acceleration measurement 19 continue to be carried out unchanged.
  • the evaluation of the acceleration measurement likewise continues according to steps 21, 22, but in the current memory it is no longer a summation of the angle of rotation ⁇ , but rather a summation of the deflection angle ⁇ now after step 23, as explained above.
  • a query is then made as to whether the current values of the torque M or the deflection angle ⁇ are within the predetermined limit ranges according to FIG. 4. If this is not the case, as is initially not the case due to values for the torque M and the deflection angle ⁇ which are too small, a query is made in step 31 as to whether the upper limit values M max , ⁇ max have been exceeded by the current values. If the current values M, ⁇ are still below the predefined end range, this is naturally not the case and the torque measurement M and acceleration measurement will continue to run unchanged. As an alternative, step 31 can only be predicted at a later point in time, namely when the lower limit values M min , ⁇ min have been exceeded. This step 31 would then follow step 30 in the "Yes" branch. This could also save computing capacity if necessary.
  • step 30 If it is determined in step 30 that a current measured value M, ⁇ lies in the specified interval of the lower and upper limit values, then a signal is triggered in step 32, for example LED line 7, so that a measurement result lies in the desired range.
  • a signal triggering can be carried out individually for each step, or such a signal triggering can only take place if both criteria are met.
  • This last signal trigger indicates to the user that the tightening process has been successfully completed. In the case of a separate display, the user is signaled that, at the end of the tightening process, he must also pay close attention to reaching the other criterion. However, the torque measurement M and the acceleration measurement are still as before still made.
  • the user will generally relieve the torque wrench 1. Accordingly, the torque M, the angular acceleration and the angular velocity ⁇ ⁇ assume the value zero. If this is determined by the evaluation device 5 in step 33, it ensures that the end values are displayed, for example on the LCD display 8. These end values can also be stored by the evaluation device 5, for example up to 1,000 pieces. Alternatively, these end values can also be transferred to a computer 11 or printer 12 immediately or after storage, as explained at the beginning. If, however, the evaluation device 5 determines in step 33 that there is still a torque M and / or an angular velocity ⁇ ⁇ in the tightening direction, the torque measurement M and the acceleration measurement will also continue to be performed.
  • step 30 it can be determined in step 30 that the current values M, ⁇ are no longer within the predetermined interval, but instead according to step 31 the predetermined upper limits M max and / or ⁇ max have been exceeded. In this case, a "faulty" signal is triggered in step 35. In particular if the maximum limit values are exceeded incorrectly, it has also proven expedient to use an acoustic display, for example a buzzer.
  • step 33 in a step 36 determined whether the tightening process is finished and it then accordingly comes to a final value display 37 "faulty" or the measuring process is still continued.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Control Of Transmission Device (AREA)

Claims (9)

  1. Clé dynamométrique munie d'un dispositif électronique d'évaluation pour les valeurs mesurées par des capteurs pour capter le couple de rotation et l'angle de rotation, dans lequel un capteur est réalisé sous la forme d'un capteur d'accélération (9) pour capter l'accélération angulaire (d2α/dt2), dont les valeurs mesurées sont intégrées temporellement deux fois par le dispositif d'évaluation (5) pour déterminer l'angle de rotation (α), caractérisée en ce que le dispositif d'évaluation (5) est susceptible d'être pré-programmé avec un couple de démarrage (Ms) et détermine un angle de déviation (β) à partir du moment où le couple de démarrage (Ms) a été atteint.
  2. Clé dynamométrique selon la revendication 1, caractérisée en ce que le capteur d'accélération (9) est disposé dans la clé dynamométrique (1) à une distance définie (s) par rapport à l'axe de rotation (2) et en ce que l'axe de rotation (2) sert de point fixe virtuel pour le capteur d'accélération (9).
  3. Clé dynamométrique selon la revendication 1 ou 2, caractérisée en ce que les valeurs mesurées du capteur d'accélération (9) sont évaluées seulement dans un sens de rotation ou de comptage, susceptible d'être choisi préalablement, de la vitesse angulaire (dα/dt).
  4. Clé dynamométrique selon l'une des revendications précédentes, caractérisée en ce que le dispositif d'évaluation (5) est susceptible d'être pré-programmé avec chaque fois une valeur de seuil supérieure et inférieure pour le couple de rotation (Mmin, Mmax) et un angle de déviation (βmin βmax) et en ce que le dispositif d'évaluation indique une valeur instantanée (M, β) se trouvant entre les valeurs de seuil.
  5. Clé dynamométrique selon l'une des revendications précédentes, caractérisée en ce que le dispositif d'évaluation (5) indique le dépassement de la valeur de seuil inférieure du couple de rotation (Mmin) et/ou de l'angle de déviation (βmin).
  6. Clé dynamométrique selon la revendication 4 ou 5, caractérisée en ce que le dispositif d'évaluation (5) indique le dépassement de la valeur de seuil supérieure du couple de rotation (Mmax) et/ou de l'angle de déviation (βmax).
  7. Clé dynamométrique selon l'une des revendications 4 à 6, caractérisée en ce que l'indication est réalisée à l'aide d'au moins une diode luminescente (7).
  8. Clé dynamométrique selon l'une des revendications précédentes, caractérisée en ce que l'évaluation des valeurs mesurées est réalisée de manière analogique.
  9. Clé dynamométrique selon l'une des revendications précédentes, caractérisée en ce que l'évaluation des valeurs mesurées est réalisée de manière numérique.
EP97932810A 1996-09-12 1997-07-11 Cle dynamometrique Expired - Lifetime EP0925155B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29724239U DE29724239U1 (de) 1996-09-12 1997-07-11 Drehmomentschlüssel

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19637067A DE19637067A1 (de) 1996-09-12 1996-09-12 Drehmomentschlüssel
DE19637067 1996-09-12
PCT/EP1997/003696 WO1998010901A1 (fr) 1996-09-12 1997-07-11 Cle dynamometrique

Publications (2)

Publication Number Publication Date
EP0925155A1 EP0925155A1 (fr) 1999-06-30
EP0925155B1 true EP0925155B1 (fr) 2000-09-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97932810A Expired - Lifetime EP0925155B1 (fr) 1996-09-12 1997-07-11 Cle dynamometrique

Country Status (6)

Country Link
US (1) US6167788B1 (fr)
EP (1) EP0925155B1 (fr)
AU (1) AU3622497A (fr)
DE (2) DE19637067A1 (fr)
ES (1) ES2150784T3 (fr)
WO (1) WO1998010901A1 (fr)

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Also Published As

Publication number Publication date
EP0925155A1 (fr) 1999-06-30
DE19637067A1 (de) 1998-03-19
WO1998010901A1 (fr) 1998-03-19
AU3622497A (en) 1998-05-11
ES2150784T3 (es) 2000-12-01
US6167788B1 (en) 2001-01-02
DE59702356D1 (de) 2000-10-19

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