WO2016034283A1 - Dispositif de mesure de force - Google Patents

Dispositif de mesure de force Download PDF

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Publication number
WO2016034283A1
WO2016034283A1 PCT/EP2015/001765 EP2015001765W WO2016034283A1 WO 2016034283 A1 WO2016034283 A1 WO 2016034283A1 EP 2015001765 W EP2015001765 W EP 2015001765W WO 2016034283 A1 WO2016034283 A1 WO 2016034283A1
Authority
WO
WIPO (PCT)
Prior art keywords
force
ring
measuring device
deformation
force introduction
Prior art date
Application number
PCT/EP2015/001765
Other languages
German (de)
English (en)
Inventor
Manfred Rettig
Original Assignee
Schenck Process 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
Priority claimed from DE102014013042.8A external-priority patent/DE102014013042B4/de
Priority claimed from DE202014007167.5U external-priority patent/DE202014007167U1/de
Application filed by Schenck Process Gmbh filed Critical Schenck Process Gmbh
Publication of WO2016034283A1 publication Critical patent/WO2016034283A1/fr

Links

Classifications

    • 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
    • G01G3/14—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 measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/141—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc or ring shaped
    • 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
    • G01G3/14—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 measuring variations of electrical resistance
    • G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
    • G01G3/1408—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric
    • 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
    • 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

  • the invention relates to a force measuring device according to the preamble of
  • Force measuring devices which are preferably used as load cells, convert the deformations occurring under the action of the force to be measured into electrical variables.
  • electromechanical strain gauges are used, which are caused by changes in length resistance changes. The electrical quantities obtained are then in a measuring bridge circuit
  • Such a force measuring device which is also referred to as a load cell, is known from DE 37 36 154 C2.
  • This consists basically of two rotationally symmetrical axially superimposed halves as the upper and lower part, which are connected to each other in the inner region by two screws.
  • Each of the two halves has a central cylindrical inwardly projecting part, the upper part as
  • the upper part has an upwardly directed planar force introduction surface which serves to load a force to be measured.
  • Coaxially with the load cell contains an inwardly directed trapezoidal deformation ring having on its downwardly extending horizontal annular surface electromechanical strain gauges.
  • the upper part of the load cell is on the outside with a coaxial with the deformation ring downwards
  • the deformation ring is connected on its upper level laterally via two coaxial annular webs inside with the force introduction body and outside with the force introduction ring.
  • the lower part as the lower half of the load cell is basically comparable to the upper half except for the force introduction surface.
  • the measuring elements of the deformation rings of both halves face each other and the
  • Force introduction rings are based on each other and are connected by a weld. This is formed by the annular grooves for the
  • CONFIRMATION COPY Ring webs out an inner cavity in which the measuring elements are encapsulated by external influences and thus protected.
  • the lower part contains on its outer diameter edge a short support ring through which the force to be measured down into the
  • a load cell is known from DE 38 37 683 C2, which also has an encapsulated annular cavity between a similar lower and lower part.
  • the annular lands between the inner force introduction body and the outer force introduction ring each
  • Deforming ring formed as a radial flat annular surface, which acts as an elastic leaf spring. This is intended to reduce the hysteresis error in the joints.
  • the force to be measured is also introduced centrally into the can axis and discharged radially outward through a support ring. In the case of a force load, a moment necessarily arises between the introduction of force and the force discharge, which also causes a radial movement at least on the support ring
  • a force measuring device is also known in which the strain gauges are protected against external influences by a ring interior.
  • the force measuring device is formed of three horizontally stacked parts, with a power transmission element in the middle, a
  • Measuring body element and below a plate is arranged. That's how it works Measuring body element formed by a disc-shaped body having in a radial plane two coaxially arranged downwardly directed deformation rings, between which an upwardly directed force introduction ring is formed. To transmit the introduced force is in the center of the Meß stresses a cylindrical force introduction element and radially outwardly an annular
  • a cylindrical force transmission element is arranged to the top of force, which rests with its lower flat surface loosely on the upward force application ring. Since the force to be measured at the top is centrally introduced into the force transmission element and transmitted via the radially offset arranged force introduction rings in the strain gauges, creates a moment by which a horizontal force component is caused in the loosely superimposed contact surfaces, by the friction normally a hysteresis verwertwertverbibschende occurs. To avoid this, the webs between the force introduction ring and the
  • Deformation elements associated with elaborate ring lands which has a certain ratio of its thickness or height to the radius of the central
  • Force transmission axis must comply to avoid a frictional radial displacement of the contact surfaces.
  • the force introduction to be measured can not always be introduced symmetrically with respect to the central axis of the force transmission element, it can nevertheless lead to frictional radial displacements, as a result of which the measurement accuracy is impaired.
  • the invention is therefore an object of the invention to provide a force measuring device of the type mentioned, which has a high accuracy and can be made as simple and accurate as possible. This object is achieved by the invention defined in claim 1.
  • a force measuring device which consists of an upper part and a lower part, which are fixedly connected to each other and form a ring cavity with each other, provided.
  • the upper part contains an integrated
  • a second deformation ring is arranged coaxially to the first deformation ring on the measuring body.
  • the force introduction body has on its underside a force introduction ring, which is supported centrally of the deformation rings on the measuring body.
  • the average diameter of the support ring and the average diameter of the force introduction ring match.
  • the invention has the advantage that the force measuring device can only be produced by a two-part design and is easy to assemble into a hermetically sealed device.
  • the invention has the particular advantage that the measuring body is provided only in a part of the two-part force measuring device, so that it can be produced with low manufacturing tolerances that can not be further deteriorated by manufacturing tolerances in other metrologically relevant device parts. Accordingly, no measurement-relevant deformation rings and the like are arranged in the lower part, which could be adversely affected by an assembly inaccuracy during assembly.
  • the force measuring device has no e.g. By screw against each other sliding components that generate hysteresis due to friction and thus could worsen the accuracy of measurement.
  • the invention has the advantage that the deformation rings are arranged symmetrically to the force introduction ring and thus the force transmission through the
  • the force introduction body contains a planar force introduction surface.
  • a flat large-area force introduction surface is advantageous in that way at the same time the footprint of the force measuring device is enlarged, so that this design for large silage feet, portable scales, hydraulic
  • first and the second deformation ring radially by resilient connecting webs with each other and with an inner and an outer
  • the force introduction ring is supported axially downwards on the middle connecting web and is firmly connected thereto. It is advantageous if the average diameter of the force introduction ring also corresponds to the diameter of the central connecting web.
  • deforming rings lying in a radial plane is that they require only a small axial height.
  • the deformation rings can thus be encapsulated protected in a ring cavity, so that the force measuring device can be produced in total in a low overall height.
  • An embodiment of the invention also provides that the force transmission rings are longer in their axial extent than the deformation rings and at their ends both have an inner or outer gradation.
  • the lower part may be annular and have a rectangular or square ring cross-section. Furthermore, it may contain a stepped bore on its upper side, the outer step of which is adapted in a form-fitting manner to the inner step of the measuring body.
  • the form-fitting matched inner and outer gradation of the two parts has the advantage that they are easily plugged into each other during assembly and by fixed connection techniques, such as. Welding or bonding, simply hermetically tightly connected to each other to protect the sensitive measuring elements durably frictional free.
  • a further embodiment of the invention provides that the lower part is disc-shaped and has an upwardly directed cylinder stub at its center symmetrical to a longitudinal axis, the axial extent between its top and the underside of the force introduction body contains a defined air gap S v as axial overload protection.
  • the outer diameter of the cylinder stub by a defined air gap S H be smaller than the inner diameter of the axial bore of the measuring body and represent a radial overload protection. Due to the horizontal and vertical overload slots between the lower part and the upper part, the force measuring device has the advantage of a simple overload protection both in the horizontal and in the vertical direction. According to a further advantageous embodiment of the invention, the lower part of a fixed on a footprint or on the ground fixing ring as
  • Displacement protection be coaxially surrounded. This has the advantage that the
  • a one-piece L-shaped fastening ring or at least two separate fastening elements may be arranged, which surround a relative to the upper part in the enlarged size lower part and serve as lift-off protection.
  • the lower part encompassing fixing ring can also be provided in one piece, so that at the same time a horizontal backup and a lift-off takes place.
  • an elastic element in the form of an elastomer or elastomeric ring with an enlarged footprint can be arranged on the underside of the lower part.
  • the force measuring device can be used on less hard surfaces.
  • the width and height of the elastic element should be provided so that the force introduced from the support ring in the elastic element can be fully transmitted.
  • Fig. 1 a front view of a force measuring device
  • FIG. 2 is a sectional view of the force measuring device of FIG. 1;
  • FIG. 3 is a sectional view of a second flattened force measuring device;
  • FIG. 4 is a sectional view of another flattened force measuring device with a
  • FIG. 5 is a sectional view of a front view of a force measuring device with
  • a force measuring device is shown in front view, which is substantially rotationally symmetrical to an axial longitudinal axis 18 and only consists of a one-piece upper part 1 and a one-piece lower part 2, which are firmly and hermetically sealed together in a connecting plane 3 ,
  • the one-piece upper part 1 in this case consists at the top of a force introduction body 7 and an axially under it incorporated measuring body 9.
  • the force introduction body 7 is formed by two cylindrical sections of different diameter, which are axially connected to each other by a frusto-conical intermediate portion.
  • the upper section has a diameter of about 4/10 to 5/10 of the
  • the lower cylindrical portion of the force introduction body 7 is hollow on the inside and therefore designed as a force introduction ring 5, whose average diameter has about 7/10 of the outer diameter of the force measuring device and is supported on the measuring body 9.
  • the connected to the force introduction ring 5 as a unit measuring body 9 is cylindrical and preferably has the same outer diameter as the likewise cylindrically shaped lower part 2.
  • a support ring 8 is arranged at the lower end surface 36 of the lower part 2, the average diameter of the average diameter of the Force introduction ring 5 corresponds and which is provided for power dissipation on a footprint, not shown.
  • the details of the force measuring device are from the sectional view in Fig. 2 of
  • the upper part 1 is made of a one-piece stainless steel or aluminum material, wherein the various functional elements preferably by a machining from below from the metal raw material
  • the lower portion of the force introduction body 7 has a disc-shaped inner cavity 19, whereby the force introduction ring 5 is formed. Furthermore, the contains at the force introduction ring 5 axially downwards
  • the measuring body 9 is annular and preferably has an approximately rectangular or square cross-section.
  • two downwardly directed deformation rings 10, 11 are arranged concentrically in a radial plane. These are prepared by three introduced from below axial turns of the same axial depth in the metal raw material and leave at its upper portion to its top surface 21 to the force introduction body 7 three resilient annular
  • the connecting webs 12, 13,14 in the radial direction narrower than the deformation rings 10,11 and act as resilient joints. Due to the axially straight annular recesses, the deformation rings 10,11 are formed, except for the rounded end regions, such as rectangular, downwardly oriented rings with an approximately rectangular cross-section. In this case, in each case on the lower radial cover surfaces electromechanical strain gauges. 6
  • strain gauges applied.
  • the annular measuring body 9 has through the three recesses for working out the connecting webs 12,13,14 and the deformation rings 10,11, radially inside an axial inner power transmission ring 15 and radially outside an axial outer
  • Power transmission ring 16 The axial length of the power transmission rings 15,16 is about 1/3 longer than that of the deformation body 10,11.
  • the power transmission rings 15, 16 contain for fitting and connection with the lower part 1 at its lower
  • Ring ends an internal step 22.
  • an inner connecting web 12 Between the inner power transmission ring 15 and the inner deformation ring 10 is an inner connecting web 12 and between the inner deformation ring 10 and the outer deformation ring 11, a central connecting web 13 is arranged.
  • the middle connecting web 13 In this case, the middle connecting web 13
  • the radial width of the force introduction ring 5 preferably corresponds to the radial width of the middle connection web.
  • the inner connecting web 12 is coaxial between the inner axial power transmission ring 5 and the inner
  • Deformation ring 10 and the outer connecting web 14 coaxially disposed between the outer deformation ring 11 and the outer axial force transmission ring 16.
  • the deformation rings 10,11, the connecting webs 12,13,14, and the power transmission rings 15,16 rotationally symmetric or coaxial with the longitudinal axis 18 of the measuring body 9 are arranged.
  • the lower part 2 is arranged and positively and non-positively connected thereto.
  • the two parts 1, 2 are connected by a laser welding hermetically sealed together.
  • the lower part 2 is also here annular and has in the center an axial through hole 24, whose diameter preferably corresponds to the diameter of the axial bore 20 of the upper part 1 plus weld width.
  • the outer diameter of the lower part 2 also corresponds to the outer diameter of the measuring body part 9, so that the lower part 2 forms a cylindrical unit with the measuring body part 9.
  • annular stepped bore 25 is arranged axially above the lower part 2, at the edges of which an outer step 26 is left, which is adapted in a form-fitting manner to the inner step 22 of the upper part 1.
  • the axial height of the lower part 2 preferably corresponds to about 5/10 to 20/10 of the axial height of the Meß stresses 9 and is essentially of the permissible force load and the space required
  • Cable bushing 27 depending on a cable connection to the
  • Strain gauges 6 allows from the outside to a ring cavity 4 and executed sealed after installation.
  • a support ring 8 is disposed on the lower radial end surface 36 of the lower part 2, which is rotationally symmetrical to the longitudinal axis 18 with a mean ring diameter (D M ) 23 is arranged.
  • the support ring 8 preferably has an axial height of about 1 to 5 mm and a radial width of 1 to 5 mm, but preferably the radial width of the force introduction ring 5.
  • the dimensions of the support ring 8 are in detail of the rated load and the permissible
  • the force measuring device is usually used as a load cell for determining a weight which is directed perpendicular to the earth's surface.
  • the weight force Fe is symmetrical to the longitudinal axis 18 in the
  • Deformation rings 10.1 1 symmetrically distributed at least four electromechanical strain gauges 6 are connected to form a Wheatstone bridge, so that in the middle bridge branch a measurement signal can be tapped, which corresponds to the weight to be measured. Since the force is introduced via the force introduction ring 5 in the middle in both deformation rings 10,11, arises in both a symmetrical expansion or compression, through which a highly accurate measurement of the introduced weight force. This measuring force is discharged by the two power transmission rings 15,16 also on the symmetrically shaped lower part 2 and its support rings 8 symmetrically on the pad, not shown. This occurs in particular by the axially with the middle ring diameter (D M ) 23 arranged linearly superimposed
  • Force introduction surface 17 is provided with a particularly large flat Aufstandsfuß Structure and at the same time increases the force introduction surface on the support ring 8 by a relatively large contact diameter.
  • the axial bore 20,24 is provided with a large inner diameter, which preferably has 5/10 to 8/10 of the outer diameter.
  • the ring cross-sections of the upper part 1 with its measuring body part 9 and the lower part 2 do not differ significantly from the similar parts according to FIG. 1 and FIG. 2 of the drawing.
  • To perform the force introduction body 7 particularly rigid and flat this projects like a truncated cone 29 down into the axial bore 20. This is in particular a very flat
  • a force measuring device which corresponds to that of FIG. 3, but is preferably designed for less hard contact surfaces.
  • an elastomer ring 30 is arranged below the lower end surface 36 of the lower part 2 symmetrically to the support ring 8, by means of which the footprint of the lower part 2 is increased in area.
  • this force measuring device can preferably also be set up on concrete surfaces with a correspondingly low surface hardness without thereby impairing the measuring accuracy, since the force discharge continues to take place symmetrically and axially linearly to the introduction of force.
  • a particular embodiment of the force measuring device is shown, which includes an additional overload protection.
  • the lower part 2 is largely disc-shaped with a central upwardly directed cylinder stump 31.
  • the cylinder stub 31 is dimensioned such that its
  • Cylinder stub 31 limited to a vertical gap distance S v , whose
  • Gap distance also depends on the rated load, whereby a vertical overload protection can be achieved, which could otherwise lead to damage or Messwertverfabschung the force measuring device.
  • a fixing ring 32 is provided, whose inner diameter is about 1/10 to 5/10 mm larger than the outer diameter of the lower part 2.
  • This fixing ring 32 is preferably connected by a weld 33 with a footprint 37 of the force measuring device to a lateral
  • At least two or more fasteners 34 are screwed or otherwise secured to the fixing ring 32, which on a ring member 35 of the lower part 2, leaving a
  • the force measuring device according to Fig. 5 of the drawing is formed as that to Figs. 1 and 2 of the drawing described above, except that only the outer weld 38 on the outer power transmission ring 16 is necessary.

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

Abstract

L'invention concerne un dispositif de mesure de force qui est composé d'une partie supérieure (1) et d'une partie inférieure (2) qui sont reliées solidairement entre elles et qui forment conjointement une cavité annulaire (4). La partie supérieure (1) comporte un élément d'application de force intégré (7) et un élément de mesure (9) qui comporte une première bague de déformation (10, 11) dirigée vers le bas jusque dans la cavité annulaire (4) et pourvue d'éléments de mesure d'allongement électromécanique (6) et la partie inférieure (2) comporte sur son côté inférieur une bague d'appui pour la déviation de force (8). L'invention est caractérisée en ce que l'élément de mesure (9) comporte une seconde bague de déformation (11, 10) coaxialement à la première bague de déformation (10, 11) et l'élément d'application de force (7) comporte sur son côté inférieur une bague d'application de force (5) qui s'appuie sur l'élément de mesure (9) au milieu des bagues de déformation (10, 11) et en ce que le diamètre moyen (23) de la bague d'appui (8) est égal au diamètre moyen (23) de la bague d'application de force (5).
PCT/EP2015/001765 2014-09-02 2015-09-02 Dispositif de mesure de force WO2016034283A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE202014007167.5 2014-09-02
DE102014013042.8A DE102014013042B4 (de) 2014-09-02 2014-09-02 Kraftmessvorrichtung
DE102014013042.8 2014-09-02
DE202014007167.5U DE202014007167U1 (de) 2014-09-02 2014-09-02 Kraftmessvorrichtung

Publications (1)

Publication Number Publication Date
WO2016034283A1 true WO2016034283A1 (fr) 2016-03-10

Family

ID=54072785

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/001765 WO2016034283A1 (fr) 2014-09-02 2015-09-02 Dispositif de mesure de force

Country Status (1)

Country Link
WO (1) WO2016034283A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018113771A1 (de) 2018-06-08 2019-12-12 Schenck Process Europe Gmbh Messvorrichtung zur Ermittlung von Zug- und Druckkräften, insbesondere Wägezelle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390327B (de) * 1988-08-18 1990-04-25 Brosa Erich Ringfoermige druckkraftmesszelle
EP0715157A2 (fr) * 1994-11-30 1996-06-05 Gtm Gassmann Theiss Messtechnik Gmbh Capteur de plusieurs composantes de force et de moment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390327B (de) * 1988-08-18 1990-04-25 Brosa Erich Ringfoermige druckkraftmesszelle
EP0715157A2 (fr) * 1994-11-30 1996-06-05 Gtm Gassmann Theiss Messtechnik Gmbh Capteur de plusieurs composantes de force et de moment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018113771A1 (de) 2018-06-08 2019-12-12 Schenck Process Europe Gmbh Messvorrichtung zur Ermittlung von Zug- und Druckkräften, insbesondere Wägezelle
DE102018113771B4 (de) 2018-06-08 2023-05-25 Schenck Process Europe Gmbh Messvorrichtung zur Ermittlung von Zug- und Druckkräften, insbesondere Wägezelle

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