DE1147411B - Load cell - Google Patents
Load cellInfo
- Publication number
- DE1147411B DE1147411B DESCH30413A DESC030413A DE1147411B DE 1147411 B DE1147411 B DE 1147411B DE SCH30413 A DESCH30413 A DE SCH30413A DE SC030413 A DESC030413 A DE SC030413A DE 1147411 B DE1147411 B DE 1147411B
- Authority
- DE
- Germany
- Prior art keywords
- plate
- force
- load
- load cell
- action
- 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.)
- Pending
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Force In General (AREA)
Description
Kraftmeßdose Zusatz zum Patent 1 129317 Die Erfindung betrifft eine Kraftmeßdose, bestehend aus einer kreissymmetrischen Platte mit zentraler Krafteinleitung und starrer Abstützung am Plattenrand, nach Patent 1 129 137. Load cell addendum to patent 1 129317 The invention relates to a Load cell, consisting of a circularly symmetrical plate with central force introduction and rigid support on the edge of the plate, according to patent 1,129,137.
Bei der den Gegenstand des Hauptpatentes bildenden Kraftmeßdose ist die Dicke der Platte als Funktion des Plattenradius derart bemessen, daß die radiale Dehnung über die radiale Erstreckung der Platte im Betrag annähernd konstant ist, jedoch an einer Stelle bestimmten radialen Abstandes vom Plattenmittelpunkt einen Richtigungswechsel aufweist. Hierdurch wird eine in Herstellung und Handhabung einfache Kraftmeßdose geringer Bauhöhe mit guten Meßeigenschaften geschaffen, die einige Nachteile der bis dahin bekannten Kraftmeßdosen vermeidet. The load cell forming the subject of the main patent is the thickness of the plate as a function of the plate radius such that the radial The amount of elongation over the radial extent of the plate is approximately constant, however, at one point a certain radial distance from the center of the plate Has change of direction. This makes it easy to manufacture and handle Load cell of low overall height with good measuring properties created some Avoids disadvantages of the previously known load cells.
Bei einer Kreisplatte, die, wie dies im Hauptpatent vorgesehen ist, belastet und gelagert ist, ist eine Erscheinung zu beobachten, die bei Verwendung einer solchen Anordnung für ein hochwertiges Meßgerät nicht außer Betracht gelassen werden kann. In the case of a circular plate, which, as provided in the main patent, is loaded and stored, a phenomenon can be observed when using such an arrangement for a high quality measuring device is not disregarded can be.
Belastet man nämlich eine derartige Kreisplatte, so nimmt die Dehnung zunächst proportional der belastenden Kraft zu. Im Bereich höherer Kraftwirkung jedoch ist die Dehnungszunahme geringer als proportional. Diese Nichtlinearität ist um so stärker, je größer die Durchbiegung der Platte im Verhältnis zu ihrer Dicke wird. Demnach weisen dünne Platten eine besonders hohe Nichtlinearität auf. Verwendet man nun eine derart belastete Kreisplatte bei einer Kraftmeßdose, die zur Messung geringer Lasten bestimmt ist, so kann sich dieser Effekt in einem Maße auswirken, das nicht mehr toleriert werden kann.If you load such a circular plate, the expansion increases initially proportional to the loading force. In the area of higher force however, the increase in elongation is less than proportional. This non-linearity is the greater, the greater the deflection of the plate in relation to its Thickness will. Accordingly, thin plates have a particularly high non-linearity. If one uses such a loaded circular plate in a load cell that is intended for the measurement of low loads, this effect can be increased to a certain extent that can no longer be tolerated.
Die Erfindung bezweckt, diesen Nachteil zu vermeiden, und erreicht dies dadurch, daß die Platte derart gestaltet ist, daß im unbelasteten Zustand ihre der Kraftwirkungsrichtung entgegengerichtete Fläche der Wirkungsrichtung der Kraft entgegen gewölbt ist, bei halber Nennlast etwa eine ebene Kreisfläche bildet und bei voller Nennlast eine der erstgenannten Wölbung annähernd gleich große, aber entgegengerichtete Wölbung erhält. Durch eine derartige Gestaltung wird die nachteilige Nichtlinearität, insbesondere bei der Verwendung dünner Platten, d. h. bei Kraftmeßdosen geringer Nennlast, vermieden, bzw. auf ein Maß herabgesetzt, das innerhalb der üblichen Toleranzen liegt. The invention aims to obviate and achieves this disadvantage this in that the plate is designed in such a way that its in the unloaded state the area opposite to the direction of action of the force's direction of action is curved in the opposite direction, forms approximately a flat circular surface at half the nominal load and at full rated load one of the first-mentioned curvature approximately the same size, but opposite curvature receives. Such a design is the disadvantageous Non-linearity, especially when using thin plates, i. H. for load cells low nominal load, avoided or reduced to a level that is within the usual Tolerances.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung in schematischer Weise im Querschnitt dargestellt. An embodiment of the invention is shown in the drawing in schematic Way shown in cross section.
Die gemäß dem Hauptpatent bemessene Kreisplattel mit dem Auflagerand 2 wird über den Ansatz 3, der beispielsweise mit einem Gewinde versehen sein kann, belastet. Sie erfährt unter dieser Belastung eine Verformung, die an ihrer Unterseite mittels der Dehnmeßstreifen 4 bis 7 ermittelt und als Maß für die Kraft verwendet wird. Die der zu messenden Kraft entgegengerichtete Fläche der Platte 1 - im dargestellten Ausführungsbeispiel die obere Fläche 8 - ist erfindungsgemäß so gestaltet, daß sie im unbelasteten Zustand der Platte, von der Krafteinleitungsstelle 3 aus gesehen, nach außen zum Rand 2 hin abfällt. Dadurch erhält die Platte im unbelasteten Zustand eine der Kraftwirkungsrichtung P entgegengerichtete Wölbung. The circular plate measured according to the main patent with the support edge 2 is on the approach 3, which can be provided with a thread, for example, burdened. Under this load, it experiences a deformation on its underside determined by means of the strain gauges 4 to 7 and used as a measure of the force will. The surface of the plate 1 facing the opposite of the force to be measured - in the illustrated Embodiment the upper surface 8 - is designed according to the invention so that it in the unloaded state of the plate, seen from the force introduction point 3, slopes outwards towards the edge 2. This gives the plate in the unloaded state a curvature opposite to the direction of force action P.
Die Gestaltung und Bemessung der Platte und das Maß der Wölbung sind so gewählt, daß bei halber Nennlast die Fläche 8 eine annähernd ebene Kreisfläche bildet, die im Ausführungsbeispiel horizontal verläuft, bei voller Nennlast aber eine Wölbung in der Kraftwirkungsrichtung, d. h. der Wölbung bei unbelastetem Zustand entgegengerichtet, jedoch von etwa gleichem Ausmaß erhält. The design and dimensioning of the plate and the degree of curvature are chosen so that at half the nominal load the surface 8 is an approximately flat circular surface forms, which runs horizontally in the embodiment, but at full rated load a bulge in the direction of force action, d. H. the curvature when unloaded in the opposite direction, but of about the same extent.
Durch die erfindungsgemäße Gestaltung wird erreicht, daß der Dehnungsverlauf im Meßbereich innerhalb des Bereiches bleibt, in dem die Dehnung der Kraft angenähert proportional ist. The design according to the invention ensures that the course of expansion remains in the measuring range within the range in which the elongation approximates the force is proportional.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH30413A DE1147411B (en) | 1961-10-13 | 1961-10-13 | Load cell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DESCH30413A DE1147411B (en) | 1961-10-13 | 1961-10-13 | Load cell |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1147411B true DE1147411B (en) | 1963-04-18 |
Family
ID=7431740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DESCH30413A Pending DE1147411B (en) | 1961-10-13 | 1961-10-13 | Load cell |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1147411B (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4020911A (en) * | 1973-08-10 | 1977-05-03 | Structural Instrumentation, Inc. | Load cell scale |
FR2416458A1 (en) * | 1978-02-03 | 1979-08-31 | Sedeme | Force measuring detector for weighing applications - has extensometer gauges in thin layers on membrane element having angled upper and lower layers with four deformable elements in between |
EP0590713A2 (en) * | 1992-09-30 | 1994-04-06 | Philips Patentverwaltung GmbH | Force transducer using a cirular plate spring |
FR2836217A1 (en) * | 2002-02-21 | 2003-08-22 | Maurice Ouaknine | Dynamometer sensor for realization of posture and weighing platforms used in evaluation of asymmetries and instabilities in patient posture, has a membrane with four attached strain gauges forming a bridge measurement circuit |
WO2020102778A1 (en) * | 2018-11-15 | 2020-05-22 | Intuitive Surgical Operations, Inc. | Strain sensor with contoured deflection surface |
US11432894B2 (en) | 2017-11-15 | 2022-09-06 | Intuitive Surgical Operations, Inc. | Surgical instrument end effector with integral FBG |
US11497580B2 (en) | 2009-05-19 | 2022-11-15 | Intuitive Surgical Operations, Inc. | Cleaning of a surgical instrument force sensor |
US11571264B2 (en) | 2007-12-18 | 2023-02-07 | Intuitive Surgical Operations, Inc. | Force sensor temperature compensation |
US11650111B2 (en) | 2007-12-18 | 2023-05-16 | Intuitive Surgical Operations, Inc. | Ribbed force sensor |
US11707335B2 (en) | 2005-12-30 | 2023-07-25 | Intuitive Surgical Operations, Inc. | Wireless force sensor on a distal portion of a surgical instrument and method |
US11980504B2 (en) | 2018-05-25 | 2024-05-14 | Intuitive Surgical Operations, Inc. | Fiber Bragg grating end effector force sensor |
-
1961
- 1961-10-13 DE DESCH30413A patent/DE1147411B/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4020911A (en) * | 1973-08-10 | 1977-05-03 | Structural Instrumentation, Inc. | Load cell scale |
FR2416458A1 (en) * | 1978-02-03 | 1979-08-31 | Sedeme | Force measuring detector for weighing applications - has extensometer gauges in thin layers on membrane element having angled upper and lower layers with four deformable elements in between |
EP0590713A2 (en) * | 1992-09-30 | 1994-04-06 | Philips Patentverwaltung GmbH | Force transducer using a cirular plate spring |
EP0590713A3 (en) * | 1992-09-30 | 1994-04-13 | Philips Patentverwaltung GmbH | Force transducer using a cirular plate spring |
FR2836217A1 (en) * | 2002-02-21 | 2003-08-22 | Maurice Ouaknine | Dynamometer sensor for realization of posture and weighing platforms used in evaluation of asymmetries and instabilities in patient posture, has a membrane with four attached strain gauges forming a bridge measurement circuit |
US11707335B2 (en) | 2005-12-30 | 2023-07-25 | Intuitive Surgical Operations, Inc. | Wireless force sensor on a distal portion of a surgical instrument and method |
US11650111B2 (en) | 2007-12-18 | 2023-05-16 | Intuitive Surgical Operations, Inc. | Ribbed force sensor |
US11571264B2 (en) | 2007-12-18 | 2023-02-07 | Intuitive Surgical Operations, Inc. | Force sensor temperature compensation |
US11497580B2 (en) | 2009-05-19 | 2022-11-15 | Intuitive Surgical Operations, Inc. | Cleaning of a surgical instrument force sensor |
US11432894B2 (en) | 2017-11-15 | 2022-09-06 | Intuitive Surgical Operations, Inc. | Surgical instrument end effector with integral FBG |
US11980504B2 (en) | 2018-05-25 | 2024-05-14 | Intuitive Surgical Operations, Inc. | Fiber Bragg grating end effector force sensor |
WO2020102778A1 (en) * | 2018-11-15 | 2020-05-22 | Intuitive Surgical Operations, Inc. | Strain sensor with contoured deflection surface |
US11815412B2 (en) | 2018-11-15 | 2023-11-14 | Intuitive Surgical Operations, Inc. | Strain sensor with contoured deflection surface |
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