DE3412754A1 - Force sensor - Google Patents

Force sensor

Info

Publication number
DE3412754A1
DE3412754A1 DE19843412754 DE3412754A DE3412754A1 DE 3412754 A1 DE3412754 A1 DE 3412754A1 DE 19843412754 DE19843412754 DE 19843412754 DE 3412754 A DE3412754 A DE 3412754A DE 3412754 A1 DE3412754 A1 DE 3412754A1
Authority
DE
Germany
Prior art keywords
sleeve
deformation body
sealing rings
force
force sensor
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Withdrawn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
DE19843412754
Other languages
German (de)
Inventor
Jörg Ing.(grad.) 2000 Norderstedt Sander
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.)
Philips Intellectual Property and Standards GmbH
Original Assignee
Philips Patentverwaltung 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 Philips Patentverwaltung GmbH filed Critical Philips Patentverwaltung GmbH
Priority to DE19843412754 priority Critical patent/DE3412754A1/en
Publication of DE3412754A1 publication Critical patent/DE3412754A1/en
Withdrawn legal-status Critical Current

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/30—Means for preventing contamination by dust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)

Abstract

The force sensor, used in particular in load cells, consists of a cylindrical deformation member 1 which is provided with a strain gauge 5 and on which a tubular sleeve 6 is placed in the region of the strain gauge 5. At its ends, the sleeve 6 is connected via sealing rings 7 and 8 made from elastic material to the deformation member 1 in such a way as to produce a tightly sealed space around the strain gauge 5 without the freedom of movement of the deformation member 1 and thus the characteristic of the force sensor being influenced by the sleeve 6. <IMAGE>

Description

KraftaufnehmerForce transducers

Die Erfindung bezieht sich auf einen Kraftaufnehmer, insbesondere für Xägezellen, bestehena aus einem mit Dehnungsmeßstreifen versehenen zylindrischen Verformungskörper, auf den im Bereich der Dehnungsmeßstreifen eine rohrförmige Hülse aufgesetzt ist, die an ihren Enden abdichtend mit dem Verformungskörper in Verbindung steht.The invention relates to a force transducer, in particular for load cells, consist of a cylindrical one with strain gauges Deformation body on which a tubular sleeve in the area of the strain gauges is placed, which is sealingly connected at its ends with the deformation body stands.

Aus der US-PS 39 11 737 ist ein Kraftaufnehmer für Wägezellen mit einem zylindrischen Verformungskörper bekannt, auf den im Bereich der Dehnungsmeßstreifen eine ringförmige Hülse aufgepreßt ist. Diese Hülse bildet zum Schutz des Uehnungsmeßstreifens mit dem Verformungskörper einen geschlossenen Raum und ist derart starr und formschlüssig angebracht, daß sie sich bei Einwirkung einer Kraft auf den Verformungskörper mit verformt und damit die Kennlinie des Kraftaufnehmers mitbestimmt. Außerdem ist sie nur sehr schwer vom Verformungskörper abzuziehen, wenn beispielsweise defekte Dehnungsmeßstreifen auszutauschen sind.From US-PS 39 11 737 a force transducer for load cells is with a cylindrical deformation body known, on the in the area of the strain gauges an annular sleeve is pressed on. This sleeve forms the protection of the Uehnungsmeßstreifens with the deformation body a closed space and is so rigid and form-fitting attached that they are with the action of a force on the deformation body deformed and thus also determines the characteristic curve of the force transducer. Besides, she is very difficult to pull off the deformation body if, for example, defective strain gauges are to be exchanged.

Aufgabe der vorliegenden Erfindung ist es, die zum Schutz der Dehnungsmeßstreifen auf den Verformungskörper eines Kraftaufnehmers aufgesetzte Hülse derart auszubilden, daß sie den ica um die Dehnunqsmeßstreifen dicht abschließt, leicht auszuwechseln ist und die Kennlinie des Kraftaufnehmers möglichst weniq beeinflußt.The object of the present invention is to protect the strain gauges to form a sleeve placed on the deformation body of a force transducer in such a way that that it seals the ica tightly around the strain gauges, easy to replace and influences the characteristic curve of the force transducer as little as possible.

Diese Aufgabe wird erfinaungsqemäß dadurch aelöst, aa der Innendurchmesser der Hülse qrölber als der Außendurchmesser des Verformunt-1skörrers ist una <~ai# zwischen den Enden der Hülse uno cem Verformungskörper Dichtungsrinqe aus elastischem Material angeordnet sind.According to the invention, this object is achieved by aa the inside diameter the sleeve is larger than the outer diameter of the deformed body is una <~ ai # between the ends the sleeve uno cem deformation body sealing ring are arranged from elastic material.

Dadurch wird bei Einwirkung einer Kraft zwar der Verformungskörper, nicht aber die rohrförmiqe Hülse verformt, so daß die kennlinie des Kraftaufnehmers von der Hülse nicht beeinflußt wird. Außerdem dichten die aus elastischem Material bestehenden Dichtungsringe den Raum um die Dehnungsmeßtreifen auch dann vollständia ab, wenn sich der Verformungskörper bei Einwirkunq einer Kraft verformt.As a result, when a force is applied, the deformation body, but not deformed the tubular sleeve, so that the characteristic curve of the force transducer is not influenced by the sleeve. In addition, they are made of elastic material existing sealing rings also completely fill the space around the strain gauges when the deformation body deforms when a force is applied.

Da Gummi bzw. Kunststoff preisqünstige und sehr elastische Materialien sind, ist es vorteilhaft, die Dichtungsringe aus Gummi bzw. Kunststoff herzustellen.Because rubber and plastic are inexpensive and very elastic materials are, it is advantageous to make the sealing rings from rubber or plastic.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Zeichnungen beschrieben. Es zeigen: Fig. 1 einen Verformungskörper eines Kraftaufnehmers mit aufgesetzter Hülse, Fig. 2 den Verformungskörper nach Einwirkung einer Kraft.An embodiment of the invention is described below with reference to the Drawings described. 1 shows a deformation body of a force transducer with the sleeve attached, Fig. 2 shows the deformation body after the action of a force.

Der Verformunqskörper in Fig. 1 ist beispielsweise als Biegestab ausgebildet, der an seinem Ende 2 in einer Haltevorrichtung 3 befestigt ist. Zum Schutz des auf der Grundfläche einer Bohrung 4 aufgebrachten Dehnungsmefsstreifens 5 ist auf den Verformungskörper 1 im Bereich des Dehnungsmeßstreifens D eine rohrförmige Hülse 6 aufgesetzt. Die Hülse b ist vorzugsweise aus Metall gefertigt.The deformation body in Fig. 1 is designed, for example, as a flexible rod, which is fastened at its end 2 in a holding device 3. To protect the on the base of a hole 4 applied strain gauge 5 is on the Deformation body 1 in the area of the strain gauge D is a tubular sleeve 6 put on. The sleeve b is preferably made of metal.

In Rillen 9 und 10 auf dem Verformungskörper 1 sina Dichtunqsrinae 7 und 8 angeordnet, auf denen die Hülse 6 frei beweglich geqenüber aer:\ierformunqskörper 1 lagert. Die Dichtunqsrinqe 7 und 8 können aus Gummi oder aus Kunststoff qefertiqt zein.In grooves 9 and 10 on the deformation body 1 sina Dichtunqsrinae 7 and 8 arranged, on which the sleeve 6 can move freely geqenüber aer: \ ierformunqskörper 1 stores. The sealing rings 7 and 8 can be made of rubber or plastic zein.

In Fig. 2 ist dargestellt, wie sich der Biegestab 1 bei Einwirkung einer Kraft 11 verformt, wobei die Hülse 6 ihre Form beibehält. Hierbei verformen sich die Dichtungsrinqe 7 und 8, dichten aber den Raum um den Dehnungsmeßstreifen 5 weiterhin gegen aggressive Gase und Flüssigkeiten ab.In Fig. 2 it is shown how the bending rod 1 when acted deformed by a force 11, the sleeve 6 maintaining its shape. Deform in the process the sealing rings 7 and 8, but seal the space around the strain gauge 5 continues to protect against aggressive gases and liquids.

Die auf den elastischen Dichtunqsringen 7 und 8 gelagerte Hülse 6 kann zum Schutz von Dehnungsmeßstreifen auch auf Verformungskörper angebracht sein, die auf Zuq- oder Druckkraft ansprechen.The sleeve 6 mounted on the elastic sealing rings 7 and 8 can also be attached to deformation bodies to protect strain gauges, which respond to the closing or pushing force.

Claims (3)

PATENTANSPRÜCHE Kraftaufnehmer, insbesondere für Wägezellen, stehend aus einem mit Dehnunqsmeßstreifen versehenen zylindrischen Verformungskörper, auf den im Bereich der Dehnungsmeßstreifen eine rohrförmige Hülse aufesetzt ist, die an ihren Enden abdichtend mit dem Verformungskörper in Verbindung steht, dadurch qekennzeichnet, daß der Innendurchmesser der Hülse (6) größer als der Außendurchmesser des Verformungskörpers (1) ist und daß zwischen den Enden der Hülse und dem Verformungskörper Dichtungsringe (7, 8) aus elastischem Material anqeordnet sind.PATENT CLAIMS Force transducers, especially for load cells, upright from a cylindrical deformation body provided with strain gauges a tubular sleeve is put on in the area of the strain gauges, which is sealingly connected at its ends to the deformation body, thereby q indicates that the inner diameter of the sleeve (6) is greater than the outer diameter of the deformation body (1) and that between the ends of the sleeve and the deformation body Sealing rings (7, 8) made of elastic material are arranged. 2. Kraftaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtungsringe (7, 8) aus Gummi bestehen.2. Force transducer according to claim 1, characterized in that the Sealing rings (7, 8) are made of rubber. 3. Kraftaufnehmer nach Anspruch 1, dadurch gekennzeichnet, daß die Dichtungsringe (7,8) aus Kunststoff bestehen.3. Force transducer according to claim 1, characterized in that the Sealing rings (7,8) are made of plastic.
DE19843412754 1984-04-05 1984-04-05 Force sensor Withdrawn DE3412754A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19843412754 DE3412754A1 (en) 1984-04-05 1984-04-05 Force sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843412754 DE3412754A1 (en) 1984-04-05 1984-04-05 Force sensor

Publications (1)

Publication Number Publication Date
DE3412754A1 true DE3412754A1 (en) 1985-10-17

Family

ID=6232707

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843412754 Withdrawn DE3412754A1 (en) 1984-04-05 1984-04-05 Force sensor

Country Status (1)

Country Link
DE (1) DE3412754A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208777A1 (en) * 1985-01-09 1987-01-21 Sundstrand Data Control Mounting an aircraft weight sensor within a tubular axle of an aircraft undercarriage.
DE3733961A1 (en) * 1987-10-08 1989-04-20 Krups Stiftung ELECTROMECHANICAL SCALE
EP0412325A1 (en) * 1989-08-09 1991-02-13 Mettler-Toledo, Inc. Enclosed moment-insensitive load cell
EP0816812A2 (en) * 1996-07-05 1998-01-07 Mettler-Toledo GmbH Weighing scale
EP2081007A2 (en) 2008-01-18 2009-07-22 Honeywell International Inc. Load measuring pin

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208777A1 (en) * 1985-01-09 1987-01-21 Sundstrand Data Control Mounting an aircraft weight sensor within a tubular axle of an aircraft undercarriage.
EP0208777A4 (en) * 1985-01-09 1988-05-19 Sundstrand Data Control Mounting an aircraft weight sensor within a tubular axle of an aircraft undercarriage.
DE3733961A1 (en) * 1987-10-08 1989-04-20 Krups Stiftung ELECTROMECHANICAL SCALE
EP0412325A1 (en) * 1989-08-09 1991-02-13 Mettler-Toledo, Inc. Enclosed moment-insensitive load cell
EP0816812A2 (en) * 1996-07-05 1998-01-07 Mettler-Toledo GmbH Weighing scale
EP0816812A3 (en) * 1996-07-05 1998-10-28 Mettler-Toledo GmbH Weighing scale
EP2081007A2 (en) 2008-01-18 2009-07-22 Honeywell International Inc. Load measuring pin
EP2081007A3 (en) * 2008-01-18 2011-01-26 Honeywell International Inc. Load measuring pin

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee