DE2520672A1 - Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges - Google Patents

Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges

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Publication number
DE2520672A1
DE2520672A1 DE19752520672 DE2520672A DE2520672A1 DE 2520672 A1 DE2520672 A1 DE 2520672A1 DE 19752520672 DE19752520672 DE 19752520672 DE 2520672 A DE2520672 A DE 2520672A DE 2520672 A1 DE2520672 A1 DE 2520672A1
Authority
DE
Germany
Prior art keywords
force transducer
transducer according
bending rod
rod
force
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.)
Withdrawn
Application number
DE19752520672
Other languages
German (de)
Inventor
Erich Brosa
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19752520672 priority Critical patent/DE2520672A1/en
Publication of DE2520672A1 publication Critical patent/DE2520672A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
    • G01L1/2225—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction the direction being perpendicular to the central axis

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

An instrument for the measurement of force uses a round bending rod of conical profile. The cone angle is chosen to ensure even extension under load of strain gauges mounted on the rod. The gauges are arranged in pairs connected together or placed opposite each other in one or two bridge circuits. On the free (loaded) end of the rod may be one or more grooves or cuts. Variation of their number and relative distances enables the sensitivity of the device to be altered without changing the electrical circuit sensitivity. Sensitivity may also be varied by changing the diameter of an axial boring in the rod. The force to be measured may be applied via linkages.

Description

Kraftaufnehmer xs sin:i I£raltaufnehmer in Ballrenform bekannt, sie bes-tehen im allgemeinen aus gefrästen flachen Teilen 1, etwa wie Abb. 1 und 2. Force transducer xs sin: i £ raltaufnehmer in ball shape known, they They generally consist of milled flat parts 1, similar to Figs. 1 and 2.

zine einfachere Herstellung und daauit wesentliche Verbilligung ergibt sich, wenn derartige Gerate vorzugsweise aus Dreh-teilen 2 herges-tellt werden, deren Lastaufnahmeteil mit Kerben 3, Kugeln 4 oder Zylindern 5 versehen werden können, zur Aufnahme von Wiegegehängen 6, Gelenkköpfen 7 oder Pendellagern 8, letztere z. B. bei Messungen von Kräften an Walzen 9 oder ähnlich. (Abb. 3-4-5) Sind die Dehnungsmeßstreifen 10, im folgenden kurz DMS genannt, oeispielsweise paarweise in einem Winkel zueinander angeordnet, so ergibt sich in geeigneter Schaltung bei dieser Form des Kraftaufnehmers die Möglichkeit eine unbekannte Kraftrichtung zu ermitteln.zine simpler production and, as a result, substantial reduction in price results if such devices are preferably manufactured from turned parts 2, whose load-bearing part can be provided with notches 3, balls 4 or cylinders 5, to accommodate cradle hangers 6, rod ends 7 or self-aligning bearings 8, the latter z. B. when measuring forces on rollers 9 or similar. (Fig. 3-4-5) Are the strain gauges 10, hereinafter referred to as DMS for short, for example in pairs at an angle to one another arranged, this results in a suitable circuit in this form of the force transducer the possibility of determining an unknown direction of force.

Zur Erhöhung der Dehnungsernpfindlichkeit, bei gleichzeitiger Erhaltung hoher Steifigkeit werden die etwa konischen Teile 2 des Aufnehmers mit Bohrungen versehen, die noch den Vorteil bieten, die Gesamtempfindlichkeit des Gerätes durch verschiedene Bohrungsdurchmesser zu verändern, ohne die DOSIS zu beschädigen und wieder neu aufbringen zu müssen.To increase the sensitivity to stretching while maintaining at the same time The approximately conical parts 2 of the transducer with holes are of high rigidity which still offer the advantage of reducing the overall sensitivity of the device to change different bore diameters without damaging the DOSE and to have to reapply.

Mehrere Kerben 3 oder Schneiden 13 im geeigneten Abstand zueinander ermöglichen die Iastaufnahme (Wiegen) mit verschiedener Empfindlichkeit, Abb. 6 ohne die elektrische Empfindlichkeit zu verändern.Several notches 3 or cutting edges 13 at a suitable distance from one another enable load absorption (weighing) with different sensitivity, Fig. 6 without changing the electrical sensitivity.

Der mit DMS versehene Teil des Gerätes erhält zum Schutz gegen mechanische Beschädigung und Feuchtigkeit einen stabilen zylindrischen Körper 14, dessen freie Seite 15 gleichzeitig als Überlastanschlag ausgebildet ist und dessen Hohlraum mit einer weichen Schutzmasse 16 ausgefüllt ist.The part of the device provided with strain gauges is provided for protection against mechanical Damage and moisture a stable cylindrical body 14, its free Page 15 is designed at the same time as an overload stop and its cavity with a soft protective compound 16 is filled.

Anstelle den biegeempfindlichen Teil 2 mit einem Außenkonus zu versehen, ist es z. B. für die Aufnahme von Wälzlagern 8 vorteilhafter, den äußeren Teil 2' zylindrisch auszubilden und die annähernd konische Verjüngung 17 im innern desselben Zylinders anzubringen, die auch gleichzeitig, gut geschützt, die DMS lo aufnehmen kann und durch einen Deckel 18 verschlossen ist.Instead of providing the bend-sensitive part 2 with an outer cone, is it z. B. for the inclusion of rolling bearings 8 more advantageous, the outer part 2 ' to be cylindrical and the approximately conical taper 17 inside the same Cylinder to be attached, which at the same time, well protected, accommodate the DMS lo can and is closed by a cover 18.

Diese Konstruktion ist gegen Torsionskräfte weitgehend unempfindlich. Die Aufnahme dieses, vorzugsweise als Lagerkraftmesser ausgebildeten Kraftaufnehmers kann zweckmäßig mit einem Lagerflansch 19 erfolgen oder mit diesem aus einem Stück bestehen, Abb. 5.This construction is largely insensitive to torsional forces. The inclusion of this force transducer, preferably designed as a bearing force meter can expediently take place with a bearing flange 19 or in one piece with it exist, Fig. 5.

Eine zylindrische Verlängerung 20 dieses Flansches überdeckt den Aufnehmer soweit, daß ein wirksamer Überlastschutz 15 gebildet wird.A cylindrical extension 20 of this flange covers the transducer to the extent that an effective overload protection 15 is formed.

21 bedeutet einen Löt-oder Steckanschluß für die Zuleitung zur DMS - Brückenschaltung.21 means a soldering or plug connection for the lead to the strain gauge - bridge circuit.

Claims (9)

PatentansprUche Claims n Kraftaufnehmer in Form eines Biegestabes, dadurch gekennzeichnet, daß die Biegestrecke aus einem praktisch konischen Drehteil besteht, dessen Steigung so gewählt ist, daß sich bei Belastung eine gleichmäßige Dehnung unter den DMS ergibt, welche paarweise gegenüber und/oder in einem Winkel zueinander in einer, oder zwei Brückenschaltung(en) angeordnet sind.n Force transducer in the form of a bending rod, characterized in that that the bending section consists of a practically conical rotating part, the slope of which is chosen so that there is an even stretch under the strain gauges when loaded, which in pairs opposite and / or at an angle to each other in one, or two Bridge circuit (s) are arranged. 2 Kraftaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß er am freien Lastende eine oder mehrere Nuten oder Schneiden, eine Kugel besitzt oder zur Aufnahme eines Pendellagers eingerichtet ist. 2 force transducer according to claim 1, characterized in that it at the free end of the load one or more grooves or cutting edges, has a ball or is set up to accommodate a self-aligning bearing. 3 Kraftaufnehmer nach Anspruch 1-2, dadurch gekennzeichnet, daß das konische Drehteil eine achsiale Bohrung besitzt. 3 force transducer according to claim 1-2, characterized in that the conical rotating part has an axial bore. 4 Kraftaufnehmer nach Anspruch 1-3, dadurch gekennzeichnet, daß sich über dem Messteil ein mit dem der Einspannstelle fest verbundener stabiler Zylinder befindet, dessen freie Seite als tiberlastanschlag für den Messteil dient. 4 force transducers according to claims 1-3, characterized in that Above the measuring part, a stable cylinder firmly connected to that of the clamping point whose free side serves as an overload stop for the measuring part. 5 Kraftaufnehmer nach Anspruch 1-4, dadurch gekennzeichnet, daß der Hohlraum zwischen Messteil und Zylinder mit einer kautschukartigen isolierenden Masse ausgefüllt ist. 5 force transducer according to claims 1-4, characterized in that the Cavity between measuring part and cylinder with a rubber-like insulating Mass is filled. 6 Kraftaufnehmer nach Anspruch 1-5, dadurch gekennzeichnet, daß ein außenzylindrischer Biegestab von seiner Lastaufnahmeseite her mit einer sich so verjüngenden Bohrung versehen ist, daß sich bei Belastung desselben über der DMS Zone, die im inneren und/oder außen des rohrförmigen Biegestabes angebracht sein kann, eine homogene Dehnung ergibt. 6 force transducer according to claim 1-5, characterized in that a outer cylindrical bending rod from its load-bearing side with a so tapered bore is provided, that when the same is loaded over the strain gauge Zone, which can be attached inside and / or outside of the tubular bending rod can result in a homogeneous elongation. 7. Kraftaufnehmer anch Anspruch 1-6, dadurch gekennzeichnet, daß die Bohrung durch einen Vershluß abgedichtet ist.7. Force transducer according to claims 1-6, characterized in that the Bore is sealed by a closure. 8. Kraftaufnahmer nach Anspruch 1-7, dadurch gekennzeichnet, daß ein Flansch, der den Bioegestab aufnimmt eine Verlängerung besitzt, die gleichzeitig als Oberlastungsschutz dient.8. force transducer according to claim 1-7, characterized in that a Flange that receives the Bioegestab has an extension that at the same time serves as overload protection. 9. Kraftaufnahmer anch Anspruch 1-3, dadurch gekennzeichnet, daß seitlich am Befestigungsteil ein Lötoder Steckenschluß vorhanden ist.9. Force transducer according to claims 1-3, characterized in that the side There is a soldered or plug connection on the fastening part.
DE19752520672 1975-05-09 1975-05-09 Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges Withdrawn DE2520672A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752520672 DE2520672A1 (en) 1975-05-09 1975-05-09 Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752520672 DE2520672A1 (en) 1975-05-09 1975-05-09 Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges

Publications (1)

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DE2520672A1 true DE2520672A1 (en) 1976-11-18

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DE19752520672 Withdrawn DE2520672A1 (en) 1975-05-09 1975-05-09 Force measuring instrument of versatile construction - uses conical bending rod with attached strain gauges

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691579A (en) * 1986-06-03 1987-09-08 Ekola Kenneth E Tension transducer
US4735102A (en) * 1986-03-07 1988-04-05 Cleveland Machine Controls, Inc. Web tension transducer apparatus
DE3922194C1 (en) * 1989-07-06 1990-11-15 Gkn Cardantec International Gesellschaft Fuer Antriebstechnik Mbh, 4300 Essen, De
US6122978A (en) * 1998-04-02 2000-09-26 Cleveland Motion Controls Web tension cantilever transducer apparatus
US6250146B1 (en) 1999-09-14 2001-06-26 Cleveland Motion Controls, Inc. Web tension transducer apparatus
US6360596B1 (en) 1999-08-05 2002-03-26 Cleveland Motion Controls, Inc. Web tension transducer
DE102007032243A1 (en) * 2007-07-11 2009-01-22 Axon Systems Ltd. Torque measuring device for motor vehicle, has strain gauge strip arrangement arranged on torsion-rigid section, which lies at transmission output and transferring transmission output moment to other components of drive strand
FR2966243A1 (en) * 2010-10-14 2012-04-20 Peugeot Citroen Automobiles Sa Method for measuring degradation level of test bearing of front windscreen wiper mechanism of motor vehicle, involves determining consequence of degradation of circumference of bore by calculating ratio between values of sensor resistances

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735102A (en) * 1986-03-07 1988-04-05 Cleveland Machine Controls, Inc. Web tension transducer apparatus
US4691579A (en) * 1986-06-03 1987-09-08 Ekola Kenneth E Tension transducer
DE3922194C1 (en) * 1989-07-06 1990-11-15 Gkn Cardantec International Gesellschaft Fuer Antriebstechnik Mbh, 4300 Essen, De
US6122978A (en) * 1998-04-02 2000-09-26 Cleveland Motion Controls Web tension cantilever transducer apparatus
US6360596B1 (en) 1999-08-05 2002-03-26 Cleveland Motion Controls, Inc. Web tension transducer
US6250146B1 (en) 1999-09-14 2001-06-26 Cleveland Motion Controls, Inc. Web tension transducer apparatus
DE102007032243A1 (en) * 2007-07-11 2009-01-22 Axon Systems Ltd. Torque measuring device for motor vehicle, has strain gauge strip arrangement arranged on torsion-rigid section, which lies at transmission output and transferring transmission output moment to other components of drive strand
FR2966243A1 (en) * 2010-10-14 2012-04-20 Peugeot Citroen Automobiles Sa Method for measuring degradation level of test bearing of front windscreen wiper mechanism of motor vehicle, involves determining consequence of degradation of circumference of bore by calculating ratio between values of sensor resistances

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