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WO1995005589A1 - Transducteur de force a jauge de contrainte - Google Patents

Transducteur de force a jauge de contrainte Download PDF

Info

Publication number
WO1995005589A1
WO1995005589A1 PCT/GB1994/001735 GB9401735W WO9505589A1 WO 1995005589 A1 WO1995005589 A1 WO 1995005589A1 GB 9401735 W GB9401735 W GB 9401735W WO 9505589 A1 WO9505589 A1 WO 9505589A1
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
casing
diaphragm
loading beams
strain gauges
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.)
Ceased
Application number
PCT/GB1994/001735
Other languages
English (en)
Inventor
Stanley Gordon Funnell
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 AU72727/94A priority Critical patent/AU7272794A/en
Publication of WO1995005589A1 publication Critical patent/WO1995005589A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction

Definitions

  • This invention relates to force transducers and more especially to force transducers which are intended to be axially loaded.
  • Force transducers are usually referred to as load cells.
  • One species of force transducer includes an axially loaded diaphragm mounted within or forming part of a rigid cylindrical casing which flexes to activate a series of strain gauges arranged as a wheatstone bridge to provide a measure of an applied load.
  • the diaphragm extends across the entire upper end of the cylindrical casing of the cell and may define a cover therefore.
  • the strain gauges are positioned on the diaphragm in a predetermined pattern and transmit electrical or electronic output signals on flexing of the diaphragm representative of the load applied to the cell.
  • the present invention sets out to provide an improved force transducer which does not suffer from, or at least alleviates, this particular disadvantage.
  • a force transducer which includes a rigid generally cylindrical casing formed with an integral end cover from whose outer surface protrudes a load point aligned with the axis of the casing, the end cover defining a diaphragm which includes diametrically aligned loading beams each of which supports on its inner face a plurality of strain gauges connected to transmit output signals representative of a force produced by a load applied to the transducer through the load point.
  • the loading beams of the diaphragm are preferably of cruciform construction with the centre of the cruciform positioned immediately below the load point. Any uniform array of loading beams may, however, be employed.
  • the loading beams may be machined into the outer surface of the end cover; alternatively, a fabricated end cover including loading beams may be provided.
  • the entire casing, end cover and loading beams are formed as an integral or fabricated unit.
  • the strain gauges are preferably mounted on the undersides of the loading beams inside the machined body cavity of the force transducer. The body cavity can then easily be sealed without inhibiting precise movement of the loading beams.
  • the cover and sides of the casing are formed as a single piece with the rearward opening of the casing sealed by a closure plate.
  • the casing may be hermetically sealed.
  • the casing interior may house, in addition to the strain gauges or the like, electrical circuits and other electronic components of the transducer.
  • Figure 1 is a side view in section of a force transducer in accordance with the invention taken along line I-I of Figure 2;
  • Figure 2 is a plan view of the transducer illustrated in Figure 1 with back cover removed;
  • FIG 3 is a circuit diagram of the features of the force transducer illustrated in Figures 1 and 2.
  • the force transducer illustrated in the drawings comprises a rigid cylindrical casing 1 including an integral cover 2 from which protrudes a load point in the form of a spigot, button or threaded stud 2 whose axis is aligned with the principal axis of the casing 1.
  • the cover 2 defines a diaphragm and is formed integrally with diametrically aligned loading beams 3 which extend across the full width of the diaphragm to describe a cruciform whose centre lies immediately below the button 2.
  • the loading beams 3 are formed integrally with the diaphragm and the casing 1, cover 2 and beams 3 are formed as a single piece.
  • the cover 2 may comprise a fabrication of a cover and separable loading beams.
  • each beam 3 Positioned below the cover 2 and mounted on the underside of each beam 3 are electrical strain gauges 5 connected as a measurement circuit in the form of a wheatstone bridge 6 to a source of electrical power via a lead and connected to transmit output signals via a lead to external measurement equipment.
  • the base of the cylindrical casing 1 is sealed by a closure plate 7.
  • a compressive or tensile load applied to the button 2 causes the loading beam cruciform to flex to cause the strain gauges 5 to transmit electrical signals to external measuring equipment to provide a measure of the force applied to the transducer through the button 2.
  • the symmetrical shaping of the loading beam 3 and the consequent load sharing between the beams provides self- compensation against errors caused by input forces being misaligned with the principal axis of the transducer, thereby ensuring that all signals transmitted provide an accurate measure of the load applied to the cell. Enclosing of the vulnerable strain gauge components and circuits prevents failures due to environmental attack and the load sharing promoted by the cruciform beam structure produces repeatedly accurate output signals which are largely uninfluenced by errors caused by force inputs misaligned with the transducer axis.
  • the force transducer is configured as a universal load cell which can be applied across a wide range of production and mechanical engineering processes in aggressive and normal environments without degradation of accuracy.
  • This advantage is attributable to the fact that the load sensing structure, which is designed for best accuracy, with cancellation of error, caused by non-aligned load inputs, is also homogeneously integral with a diaphragm which completely excludes the external atmosphere.

Landscapes

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

Abstract

L'invention concerne un transducteur de force comprenant un carter rigide généralement cylindrique muni d'un couvercle d'extrémité intégral duquel saille un point de charge aligné sur l'axe du boîtier. Il est prévu un diaphragme comportant des fléaux de charge diamétralement opposés, chacun de ceux-ci supportant une pluralité de jauges de contrainte. Ces jauges sont reliées pour transmettre des signaux de sortie représentatifs d'une force produite par une charge appliquée au transducteur au travers de son point de charge.
PCT/GB1994/001735 1993-08-19 1994-08-08 Transducteur de force a jauge de contrainte Ceased WO1995005589A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72727/94A AU7272794A (en) 1993-08-19 1994-08-08 Strain gauged force transducers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939317247A GB9317247D0 (en) 1993-08-19 1993-08-19 Improvements in and relating to force transducers
GB9317247.6 1993-08-19

Publications (1)

Publication Number Publication Date
WO1995005589A1 true WO1995005589A1 (fr) 1995-02-23

Family

ID=10740726

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001735 Ceased WO1995005589A1 (fr) 1993-08-19 1994-08-08 Transducteur de force a jauge de contrainte

Country Status (3)

Country Link
AU (1) AU7272794A (fr)
GB (1) GB9317247D0 (fr)
WO (1) WO1995005589A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2498242C1 (ru) * 2012-06-08 2013-11-10 Открытое акционерное общество "Научно-исследовательский институт физических измерений" Тензорезисторный преобразователь силы
CN106918379A (zh) * 2017-04-11 2017-07-04 宁波柯力传感科技股份有限公司 多个平行梁式称重传感器
US11156511B2 (en) * 2019-04-09 2021-10-26 Honeywell International Inc. Load cell

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712123A (en) * 1971-01-07 1973-01-23 Blh Electronics Compound-plate strain gage transducer
DE2924503A1 (de) * 1979-06-18 1981-01-15 Franz Xaver Dr Ing Gschwind Kraftmessdose
EP0410014A1 (fr) * 1989-07-22 1991-01-30 Hottinger Baldwin Messtechnik Gmbh Capteur de pression et procédé pour calibrer des capteurs de pression

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712123A (en) * 1971-01-07 1973-01-23 Blh Electronics Compound-plate strain gage transducer
DE2924503A1 (de) * 1979-06-18 1981-01-15 Franz Xaver Dr Ing Gschwind Kraftmessdose
EP0410014A1 (fr) * 1989-07-22 1991-01-30 Hottinger Baldwin Messtechnik Gmbh Capteur de pression et procédé pour calibrer des capteurs de pression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
A.V. IGNATOV ET AL.: "COMPENSATION OF TEMPERATURE ERRORS IN PRECISION STRAIN GAUGE DYNAMOMETERS", MEASUREMENT TECHNIQUES., vol. 28, no. 9, September 1985 (1985-09-01), NEW YORK US, pages 784 - 785 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2498242C1 (ru) * 2012-06-08 2013-11-10 Открытое акционерное общество "Научно-исследовательский институт физических измерений" Тензорезисторный преобразователь силы
CN106918379A (zh) * 2017-04-11 2017-07-04 宁波柯力传感科技股份有限公司 多个平行梁式称重传感器
US11156511B2 (en) * 2019-04-09 2021-10-26 Honeywell International Inc. Load cell
US20220011178A1 (en) * 2019-04-09 2022-01-13 Honeywell International Inc. Load cell
US11747226B2 (en) 2019-04-09 2023-09-05 Honeywell International Inc. Load cell

Also Published As

Publication number Publication date
AU7272794A (en) 1995-03-14
GB9317247D0 (en) 1993-10-06

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