EP0925155A1 - Cle dynamometrique - Google Patents

Cle dynamometrique

Info

Publication number
EP0925155A1
EP0925155A1 EP97932810A EP97932810A EP0925155A1 EP 0925155 A1 EP0925155 A1 EP 0925155A1 EP 97932810 A EP97932810 A EP 97932810A EP 97932810 A EP97932810 A EP 97932810A EP 0925155 A1 EP0925155 A1 EP 0925155A1
Authority
EP
European Patent Office
Prior art keywords
torque
torque wrench
rotation
angle
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.)
Granted
Application number
EP97932810A
Other languages
German (de)
English (en)
Other versions
EP0925155B1 (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

Links

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
  • Such a torque wrench is from EP 0 133
  • 00035 measured values the evaluation device for determining the 00036 angle of rotation integrated twice in time.
  • 00043 microprocessor provided, for example, a
  • 00057 axis of rotation are arranged, for example,
  • 00063 kellage such as a spatial location of the
  • 00070 torque key can be entered manually, for example 00071 den. Usually, however, is a torque wrench
  • 00077 is preprogrammable and a deflection angle from the
  • 00084 sensor an angular acceleration which is
  • 00096 direction can be evaluated.
  • the evaluation 00106 device indicates that the lower limit 00107 of the torque and / or the deflection angle 00108 has already been exceeded. This indicates to the user that the 00109 process of tightening a screw, for example, 00110 is nearing the end and that he now also has to monitor the upper limit values 00111 such that they are not exceeded by 00112. If the upper limit value of the torque and / or the deflection angle is exceeded, 00114 is likewise indicated by the evaluation device, 00115, which signals that this tightening process 00116 has not been properly completed.
  • 00117 has proven to be expedient to carry out such a display of 00118 reaching or exceeding limit values by means of 00119 at least one light-emitting diode.
  • 00120 offers a variety of display options; 00121, for example, can be signaled by a color change or a 00122 flash if the limit values of the torque or the deflection angle are exceeded.
  • 00124 Reached end values are shown together in the usual way on a 00125 LCD display or the measurement mode can also be switched and a switchable, 00127 alternative display of the end torque or the end deflection angle. These end values can be stored by the 00129 microprocessor, transferred to a computer via 00130 an appropriate interface or immediately output to a printer.
  • FIG. 1 shows the torque wrench according to the invention and its essential components
  • FIG. 2 is a flowchart which is used to explain the first 00142 phase of a tightening process after switching on 00143 of the torque wrench
  • FIG. 3 shows a flowchart for determining the deflection angle and 00147 00148
  • FIG. 4 plots the rotation angle over the torque 00149 or deflection angle.
  • 00150 00151 Fig. 1 shows the essential components of a torque wrench 1 according to the invention.
  • the angle 00166 speed marC and the angular acceleration oC in 00167 clockwise also count accordingly.
  • the torque wrench 1 has an electronic 00170 evaluation device 5 for evaluating measured values supplied by Senso00171 for the acquisition or calculation 00172 of the torque M and the angle of rotation o.
  • a key 00173 field 6 is used for pregraming, for example, a 00174 microprocessor of the evaluation device and in particular 00175 re for entering limit values with respect to the rotation or 00176 deflection angle ⁇ or the torque M. Reaching 00177 or exceeding such limit values is indicated by a 00178 LED line 7. End values of the torque M or 00179 of the torque or are shown on a 00180 LCD display 8.
  • an acceleration sensor 9 is provided for the torque wrench 1 according to 00187 of the invention for detecting 00188 the angle of rotation acceleration oC, which 00189 within the torque wrench 1 at a defined distance s from the axis of rotation 2 is located 00191.
  • the pivot axis 2 serves the acceleration sensor 00192 9 as a virtual fixed point about which it is then also pivoted 00193. This distance s is essentially 00194 determined by the design of the acceleration sensor 9 used, which is commercially available.
  • the torque wrench 00198 sel 1 can be connected via a conventional interface, for example 00199 to a computer 11 and / or a printer 12 for 00200 logging of the measurements.
  • 00201 00202 Based on the flow diagrams according to FIGS. 2 and 3, 00203 the evaluation of the measured values by the evaluation device 5 is explained in more detail below.
  • a self-test and a zero adjustment is carried out automatically in step 16 by the evaluation device 00206 5.
  • a separate calibration 00211 tion for the rotation angle measurement is provided.
  • 00212 can be done, for example, by applying the torque 00213 key 1 and manually setting the memory for the 00214 angle of rotation to the value zero. 00215 The torque wrench 1 is then pivoted about its 00216 axis of rotation 2 over a defined angle range 00217, which is then also to be indicated by the evaluation device 00218. 00219 00220 After step 16, which can possibly also be jumped to 00221, 00222 sets the parameters for the measuring process in step 17. Regardless of the 00223 sequence, these are the starting torque 00224 M ⁇ . Of course, the starting torque Ms 00225 can also be set to zero, which means that the rotation angle 001 and the deflection angle ⁇ coincide.
  • a starting torque M greater than zero 00228 is selected here, which is specified by the application 00229.
  • a lower and an upper limit value 00230 for the torque are to be set as minimum and maximum values Mmi.n, Mmax 00231, which define the torque range, in 00232 which, when a screw or the like is tightened, the final value of the torque reached 00233 as OK 00234 is located.
  • minimum and maximum values are ß. *** 'l min, 00237 P to specify the angular range in which the deflection max. 3 00238 count, beginning when the start 00239 torque Ms has reached, at the end of the measurement.
  • 00240 00241 This setpoint specification also includes 00242 for the measurement itself.
  • torque M By switching off the 00243 or another measuring device, for example, the 00244 torque M can be measured or the angular acceleration o can also be measured.
  • 00246 After setting the parameters in step 17, 00247, after applying the torque key, for example 00248 manually or controlled by one of the sensors, begins with 00249 measuring the torque M and the angular acceleration 00250 gung oi. These measurements according to steps 18, 00251 19 take place continuously over the entire tightening process, for example of a screw. In step 20, 00253 the measurement result of the torque is checked to see whether it is greater than or equal to the starting torque M 00255.
  • the torque measurement is continued as normal 00257.
  • 00258 00259 The result of the acceleration measurement O is also checked regularly in 00260 step 21, namely to determine whether the direction of rotation coincides with the tightening direction of a nut, for example. According to the specifications met here, the angular velocity ⁇ £ 00264 must be greater than zero. This query criterion can be seen here alternatively, since, for example, the occurrence 00266 of a negative torque would also indicate 00267 that the direction of rotation was reversed, for example 00268 when using a ratchet or ratchet.
  • the measured acceleration value oi is no longer processed 00271 and in particular not added to the angle of rotation in 00272 tightening direction. However, the acceleration measurement o continues as normal. 00274 00275 If it is determined in step 21 that there is a swivel movement of the torque wrench 1 in the tightening direction 000077, ie here that the angular velocity c is greater than zero, the 00279 angular acceleration OIL is integrated twice over time. 00280 different methods are available for this. With an analog 00281 gene integration, for example via differential amplifier 00282, the measured values are continuously evaluated.
  • 00283 Programming 00284 offers an alternative possibility, for example of a microprocessor which is present in evaluation circuit 5 and which then uses individual measured values as 00286 base values for numerical integration. 00287
  • the microprocessor can save all measured values as 00289 base values and use this to calculate the 00290 angle of rotation oC for the current, last measurement.
  • Alternative methods allow that integration is only carried out over the last time interval ⁇ t 00293, namely from a previous time interval 00294 t - ⁇ t to time t, where t is the current 00295 le time and ⁇ t is the time span for the penultimate 00296 measurement means. The result ⁇ .
  • 00310 stored intermediate values can be used, for example, 00311 and the acceleration measurement 00312 can still be determined by integrating the deflection angle ⁇ be00313.
  • 00318 00319 It is also clear at this point that the 00320 acceleration measurement must begin with the torque measurement at 00321 of the described embodiment.
  • 00322 the acceleration measurement tx would only begin when the 00323 starting torque M was exceeded, then the starting conditions for the integration would have to be additionally determined by measuring the 00325 angular velocity ⁇ c00326.
  • 00327 would mean another sensor 00328 or a further measurement or calculation for the torque wrench 1.
  • 00329 00330
  • the aim of tightening a screw or 00332 or the like using a torque wrench 1 according to the 00331 invention is that the torque between predetermined limit values Mmi.n, Mmax or the deflection angle 00334 between limit values ßr mi.n, ßrmax ultimately after tightening ⁇ 00335 the screw come to rest.
  • step 31 is whether the
  • Step 31 is an alternative to
  • step 30 If it is determined in step 30 that a current
  • step 32 a If in step 32 a, 00367 and the upper limit values, then in step 32 a
  • step 30 can trigger such a signal for
  • the evaluation device 5 ascertains in 00396 step 33 that a torque M and / or a 00398 angular velocity oc is still present in the tightening direction, the torque measurement M and 00400 the acceleration measurement [00400] are still carried out.
  • 00403 step 30 determines that the current values 00404 M, ß are no longer within the specified interval, 00405 but according to step 31 the specified ones upper 00406 limits Mmax and / or ßr max have been exceeded.
  • the signal is triggered "incorrectly" in step 35.
  • 00410 has also proven to be expedient to use an acoustic 00411 display, for example a buzzer.
  • 00412 00413
  • step 33 it is determined in a step 36 00414 whether the tightening process has ended and 00415 then correspondingly displays a final value 37 00416 "faulty" or the measuring process is continued as before 00417.
  • 00418 00419 All features disclosed are essential to the invention.
  • the disclosure of the application is hereby also 00421 disclosure content of the associated / attached priori

Landscapes

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

Abstract

L'invention concerne une clé dynamométrique munie d'un dispositif d'évaluation électronique pour les valeurs mesurées par des détecteurs, afin de déterminer le couple et un angle de rotation. Afin d'améliorer la technique de transmission pour déterminer l'angle de rotation, il est prévu selon l'invention qu'un détecteur se présente sous forme de détecteur d'accélération (9) pour détecter l'accélération de l'angle de rotation (α), dont les valeurs mesurées sont intégrées temporellement deux fois par le dispositif d'évaluation (5) pour déterminer l'angle de rotation (α).
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 true EP0925155A1 (fr) 1999-06-30
EP0925155B1 EP0925155B1 (fr) 2000-09-13

Family

ID=7805363

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
WO1998010901A1 (fr) 1998-03-19
DE59702356D1 (de) 2000-10-19
US6167788B1 (en) 2001-01-02
EP0925155B1 (fr) 2000-09-13
ES2150784T3 (es) 2000-12-01
AU3622497A (en) 1998-05-11
DE19637067A1 (de) 1998-03-19

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