WO2011147611A2 - Dispositif de mesure de force - Google Patents

Dispositif de mesure de force Download PDF

Info

Publication number
WO2011147611A2
WO2011147611A2 PCT/EP2011/055016 EP2011055016W WO2011147611A2 WO 2011147611 A2 WO2011147611 A2 WO 2011147611A2 EP 2011055016 W EP2011055016 W EP 2011055016W WO 2011147611 A2 WO2011147611 A2 WO 2011147611A2
Authority
WO
WIPO (PCT)
Prior art keywords
force
force measuring
measuring device
deformation body
lever
Prior art date
Application number
PCT/EP2011/055016
Other languages
German (de)
English (en)
Other versions
WO2011147611A3 (fr
Inventor
Florian Freiwald
Original Assignee
Tecsis 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 Tecsis Gmbh filed Critical Tecsis Gmbh
Publication of WO2011147611A2 publication Critical patent/WO2011147611A2/fr
Publication of WO2011147611A3 publication Critical patent/WO2011147611A3/fr

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

Definitions

  • the invention relates to a force measuring device which is suitable for measuring an axial force, and more particularly to a force measuring device in which a centrally acting on the force measuring device force is introduced into this, and amplified deflected to a arranged within the force measuring device measuring sensor.
  • Deformation body having a ring frame, which is provided in a receiving bore of the deformation body.
  • the ring frame is with a deformation disc
  • a force measuring device for measuring an axial force on a deformation body, wherein the axial force to be measured at a
  • the deformation body deflects or converts the applied axial force of the
  • Lever sections in a directed to a force measuring portion of the deformation body radial force are arranged in a directed to a force measuring portion of the deformation body radial force.
  • Lever sections are designed so that they have the axial force in their transformation into the radial force
  • a sensor provided in the interior of the deformation body on the force measuring section is force-proportional by the reinforced and in a radial direction
  • the sensor preferably consists of strain gauges or
  • Thin film sensors Any other type of sensor that provides a force by deforming action on the sensors
  • the deformation body is preferably made of steel, but may also be made of any other material that has a certain elasticity and high rigidity.
  • the predetermined angle is not a right angle, that is, an angle other than 90 °, preferably an angle in the range of 30 ° to 60 °. Further preferably, the predetermined angle of the lever sections determines the lever ratio, ie the ratio with which the lever sections over their
  • Pivot transmit the force to be measured.
  • the fulcrum of the lever portions is the connection point between the portion connecting the force introduction portion with the
  • Force measuring section connects, and the force measuring section.
  • the predetermined angle sets the factor of the gain of the force to be measured in the conversion of the axial force into the radial force.
  • the force introduction portion of the deformation body may be a rigid ring body, which is supported on the upper ends of the lever portions of the deformation body and which follows the axial force to be measured, ie moves in the direction of the applied force to the force measuring section, without deforming. Through this movement is the
  • the radial force in this case is a uniaxial force in the plane of the sensor system, that is to say in the plane in which the sensor system is arranged on the force measuring section, and causes an expansion or a compression of the sensor system.
  • the radial force may be a two-axis force in the plane of the sensor, which may be a camber of the sensor or a combined compression / elongation of the sensor
  • the predetermined angle can be chosen so that each lever portion, starting from the
  • the deformation body runs out.
  • the deformation body may be in a longitudinal section substantially X-shaped, Y-shaped or V-shaped.
  • the deformation body is preferably one
  • hourglass-shaped, rotationally symmetrical hollow body having the force measuring section in the constriction, i. in the portion of the location of the hollow body with the smallest outer diameter.
  • the predetermined angle can also be chosen so that each lever portion, starting from the
  • the deformation body can be in longitudinal section in
  • the deformation body is substantially hollow and the force measuring portion has a ridge extending between opposed inner wall portions of the
  • Deforming body extends and thus partially interconnects the inner wall sections.
  • the sensor for detecting the radial force is mounted on the web and is correspondingly deformed the force to be measured by the web is deformed by the radial force.
  • Cross-section of the lever portion of the deformation body perpendicular to its longitudinal axis is preferably annular.
  • the walls of the deformation body can also have the walls of the deformation body.
  • Fig. 1 is a side view of an inventive
  • Embodiment wherein an axial force to be measured is shown, which acts on the force measuring device;
  • FIG. 2 is a perspective view of FIG.
  • Fig. 3a is a longitudinal sectional view of the force measuring device according to the invention according to the first preferred
  • 3b is a cross-sectional view of the force measuring device according to the invention according to the first preferred
  • Fig. 3c is a cross-sectional view similar to Fig. 3b showing an alternative force measuring portion of Figs
  • FIG. 4 is a longitudinal sectional view of the force measuring device according to the first embodiment used in a holder
  • FIG. 5a and Fig. 5b are schematic
  • FIG. 6a is an enlarged view of the force measuring section of the invention shown in FIG. 3b
  • Fig. 6b is an enlarged detail view of the sensor of Fig. 6a;
  • Fig. 7 is a longitudinal sectional view of the force measuring device according to the invention according to a second preferred
  • Fig. 8 is a longitudinal sectional view of the force measuring device according to the invention according to a third preferred
  • FIG. 11 is a schematic view of the force measuring apparatus shown in FIG. 10 according to the fifth embodiment.
  • FIG. 11 is a schematic view of the force measuring apparatus shown in FIG. 10 according to the fifth embodiment.
  • Fig. 12 is a longitudinal sectional view of a
  • Fig. 13 is a schematic view of an alternative embodiment of a force measuring device according to the invention.
  • FIG. 14 is another alternative embodiment of FIG.
  • a force measuring device 1 according to the invention according to a first preferred embodiment is shown in a side view, and in Fig. 2 is the
  • Embodiment shown in a perspective view The force measuring device 1 shown has a deformation body 2, on which an attachment 3
  • the deformation body 2 and the attachment 3 may be integrally formed.
  • the deformation body 2 consists of an annular force introduction portion 21, which forms a rigid annular body, a lever portion 22, a
  • the attachment 3 consists of a disc-shaped cover portion 31 which is connectable by a threaded connection shown in Fig. 3a with the deformation body 2, and a force receiving portion 32 to which a force to be measured F a centrally engages, as shown in Fig. 1 ,
  • the force F a to be measured is determined by the
  • the deformation body 2 and the attachment 3 consist in this embodiment of steel. But it is also conceivable that the force receiving portion 32 and the entire attachment 3 and the force introduction portion 21 and the foot portion 25 of a different, harder metal and only the lever portion 22 and the
  • Connecting portion 24 made of steel.
  • the article 3a shows a longitudinal section of the deformation body 2 according to the first preferred embodiment in an exploded view.
  • the article 3 further has an extension 33 with external thread, which in a in the
  • the deformation body 2 also has a web 26 as part of the force-measuring section 23. The web 26 extends between
  • Deformation body 2 wherein in each case an opening on both sides of the web 26 is provided to form a distance between the inner wall of the deformation body 2 and a respective side edge of the web 26.
  • a sensor 4 At the web 26 is a sensor 4, such. a
  • Strain gauge arrangement or a thin film sensor arrangement formed by gluing or sputtering as shown in Figures 3b and 3c (section AA in Fig. 3a).
  • the sensor 4 is in the first preferred
  • Embodiment an arrangement of sputtered thin-film sensors, as shown in Fig. 3b.
  • the senor 4 may also be a simple strain gauge, as shown in Fig. 3c, which is glued on the web or by another
  • Joining technology is connected to the web.
  • the deformation body 2 has in longitudinal section the shape of an hourglass-shaped hollow body with web at the narrowest point, wherein the lever portion 22 assumes a predetermined angle ⁇ of preferably 45 ° to the longitudinal axis of the deformation body 2.
  • Fig. 4 shows a possible use of the
  • the force-measuring device 1 is inserted into a recess 51 of a holder 5 such that the annular foot portion 25 of the deformation body 2 rests flat on the bottom 52 of the recess 51.
  • the force receiving portion 32 of the attachment 3 protrudes upward, ie opposite to the direction of the force F a to be measured, via the holder 5 at a distance ⁇ 1 to the top of the holder 5.
  • This arrangement serves to make a on the
  • Force receiving portion 32 attaching, force-transmitting element at too high an axial force with the holder 5 and the upper edge 53 of the holder 5 goes into abutment and an unwanted plastic deformation of the
  • Inner diameter of the recess 51 is a distance provided, which serves a deformation of the deformation body 2 of the force-measuring device 1 and a certain mobility of the deformation body 2 in the
  • FIGS. 5a and 5b show a schematic
  • a force F a acts centrally on an upper beam representing the force introduction section 21 of the deformation body 2, which is connected by two fixed bearings via the lever section 22 to two middle bearings.
  • the sensor system 4 is arranged between the two middle bearings on the force measuring section 23 shown schematically.
  • the two central bearings are connected to two other fixed bearings via the connecting portion 24, which are attached to a lower beam, which the foot portion 25 of the deformation body
  • Lever portion 22 and the associated bearing is deflected into a radial force F r , which acts directed towards each of the central bearing inwardly.
  • Deformation body 2 an angle ß and between the
  • the mounted between the central bearings sensor 4 is compressed in both versions of two sides and the compression force, so the radial force F r can be detected thereby.
  • the forces acting on the upper beam force F a is caused by acting as a lever connections between the central bearings and the upper fixed bearings in the
  • Fig. 6a shows an effect of the deformation of the deformation body 2 of the first preferred embodiment shown in Figs. 5a and 5b.
  • the radial forces F r which act on the force measuring portion 23 of the deformation body 2 are applied via the web 26 on the sensor 4 and the thin-film sensors 41 sputtered thereon, whereby the sensor 4 compressed from two sides and into an oval shape (two-point dashed line) is deformed or ovalized.
  • the force F r acts as a uniaxial force in the plane of the sensor 4, which is an extension or stretching of two of the thin-film sensors 41 to Asl and a compression of the other two of the
  • Thin-film sensors 41 to As2 causes, as shown in more detail in Fig. 6b.
  • the deformation body 2 is a
  • Deformation body 2 substantially corresponds to the deformation body 2 shown in Fig. 3a, wherein an extension 251 is provided on the foot portion 25 having an external thread has, with which the deformation body 2 in a holder (not shown) can be screwed.
  • Deformation body 2 provided a weakening 221 of the inner wall in the form of an annular groove, which forms a so-called. Film hinge, whereby the lever portion 22 is flexible, so that the deformation body 2 can be easily deformed by an axial force F a . He
  • the deformation body 2 is a
  • Deformation body 2 substantially corresponds to the deformation body 2 shown in Fig. 3a, wherein in the
  • Lever portion 22 inner and outer Verschwumbleache 222, 223 and in the connecting portion 24 inner and outer Verschwumbleept 242, 243 are provided in the form of annular grooves.
  • the Verschwleiterungen 222, 223, 242, 243 form so-called. Film hinges, whereby the lever portion 22 and the connecting portion 24 are flexible.
  • the deformation body 2 has an annular foot portion 25 with an outwardly directed projection, which serves in the installed state of the force measuring device 1 to secure the foot portion 25 against axial movement and to provide a wide base for greater stability. Furthermore can such a trained foot section 25 as
  • Centering for introducing the deformation body 2 serve in a holder, as shown for example in Fig. 4.
  • the deformation body 2 is a
  • the upper part of the deformation body 2, that is, the head portion 21 together with the lever portion 22 and the force measuring portion 26 correspond to the upper part of the one shown in Fig. 3a
  • Embodiment is parallel to the longitudinal axis of the deformation body 2 differently than in the first preferred embodiment.
  • the foot portion 25 of the fourth preferred embodiment corresponds functionally to the foot portion 25 of the third preferred embodiment shown in FIG.
  • the straight, cylindrical shape of the connecting portion 24 allows a higher
  • Lever portion 22 of the deformation body 2 occurs.
  • the deformation body 2 of the fifth preferred embodiment shown in FIG. 10 essentially corresponds to the deformation body 2 shown in FIG. 3 a, wherein the web 26 has a stepped bulge downward in the axial direction of the deformation body 2.
  • the bulge can be implemented by a ring frame, as it is known from the WO 2007/124947 referred to as the prior art, wherein the ring frame is inserted into the web 26 and firmly connected thereto, for example by welding or similar.
  • Such a structure of the web 26 can cause a further amplification of the force to be measured, by further leverage through the annular frame
  • FIG. Fig. 11 shows only a schematic representation of the deformation of a
  • Embodiment is. It is also conceivable, more
  • Embodiment is shown in the longitudinal section of Fig. 12.
  • the force measuring device 1 including the measuring sensor 4 is inserted into a load receiving block 7, which consists of a relative to a vertical
  • upper Kraftteinleitschenkel 71 and a lower Kraftausleitschenkel 72 consists.
  • the block 7 has a quadrangular shape with a keyhole-shaped through hole 73 in the middle and a slot 74, which between the force introduction leg 71 and the
  • the slot 74 serves to separate the two legs 71, 72 on one side of the block 7 from each other.
  • Force measuring device 1 is in the keyhole-shaped through hole 73 transverse to the horizontal course of the
  • Force introduction leg 71 acts on the force receiving portion 32 and thereby the deformation body 2 of the
  • junction between the two legs 71, 72 is passed to the Kraftausleitschenkel 72, again discharged via the Kraftausleitschenkel 72 from the block 7.
  • the flow of forces on and in the block 7 is shown schematically by arrows.
  • a deformation of the block 7 by compressing the two legs 71, 72 and thus a maximum measurable force F a is limited solely by the width of the slot 74.
  • the slot 74 or a going into the two legs 71, 72 serves as overload protection to a plastic deformation of the
  • Force measuring device in comparison to the embodiments described above is shown schematically in Fig. 13.
  • the lever sections 22, 24 are arranged such that they each extend to the force measuring section 23 extending away from the longitudinal center axis of the deformation body 2.
  • Such a deformation body 2 has an O-shape.
  • a force F a which acts on the force measuring device 1, is deflected into a force F r , which corresponds to a tensile force acting on the sensor 4 and thus causes a force on the sensor 4, which leads to the force shown in Figures 6a and 6b
  • Embodiment of the force measuring device according to the invention shown in a schematic view.
  • the force F a is deflected as far as the web 26 via a lever section 22 which extends away from the longitudinal central axis, as a result of which an outwardly directed force F r is also generated on the sensor system 4 acts.
  • the connecting portion 24 is in this alternative
  • Krafteinleitabitess 21 directed and moves away in this direction from the longitudinal center axis of the
  • the deformation body 2 thus assumes a W-shape, wherein the outer edge of the
  • Force introduction section 21 is located.
  • the force measuring device shown schematically in FIG. 14 can therefore be suspended freely in a receiving bore or a receiving depression
  • Embodiments and alternative embodiments such as the Verschwumbleache 221, 222, 223, 242, 243, the openings 29 and the differently shaped
  • Foot portions 25 may be combined as appropriate and used in any of the possible embodiments in combination or alone.

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

Abstract

L'invention concerne un dispositif de mesure de force servant à mesurer une force axiale, ce dispositif ayant un corps de déformation comprenant une section d'introduction de force sur laquelle s'exerce la force axiale à mesurer. Le corps de déformation dévie la force axiale à mesurer de la section d'introduction de force par l'intermédiaire de sections de levier pour la convertir en une force radiale qui est ensuite appliquée de manière amplifiée, en fonction du rapport de levier, sur une section de mesure de force du corps de déformation pour déformer un système de détection situé à l'intérieur du corps de déformation proportionnellement à la force.
PCT/EP2011/055016 2010-05-27 2011-03-31 Dispositif de mesure de force WO2011147611A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010029407 DE102010029407A1 (de) 2010-05-27 2010-05-27 Kraftmessvorrichtung
DE102010029407.1 2010-05-27

Publications (2)

Publication Number Publication Date
WO2011147611A2 true WO2011147611A2 (fr) 2011-12-01
WO2011147611A3 WO2011147611A3 (fr) 2012-03-08

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Application Number Title Priority Date Filing Date
PCT/EP2011/055016 WO2011147611A2 (fr) 2010-05-27 2011-03-31 Dispositif de mesure de force

Country Status (2)

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DE (1) DE102010029407A1 (fr)
WO (1) WO2011147611A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113340507A (zh) * 2021-04-15 2021-09-03 安徽大学 一种基于“沙漏状”结构的全柔性三维力柔性触觉传感器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007124947A2 (fr) 2006-05-03 2007-11-08 Tecsis Gmbh Capteur de force axiale

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520923A (en) * 1945-06-30 1950-09-05 Robert T Franzel Force measuring device
DE2244615C2 (de) * 1972-09-12 1974-10-24 Carl Schenck Maschinenfabrik Gmbh, 6100 Darmstadt Kraftmeßdose
DE4125580A1 (de) * 1991-08-02 1993-02-04 Schenck Ag Carl Vorrichtung zum messen von kraeften

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007124947A2 (fr) 2006-05-03 2007-11-08 Tecsis Gmbh Capteur de force axiale

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113340507A (zh) * 2021-04-15 2021-09-03 安徽大学 一种基于“沙漏状”结构的全柔性三维力柔性触觉传感器

Also Published As

Publication number Publication date
WO2011147611A3 (fr) 2012-03-08
DE102010029407A1 (de) 2011-12-01

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