WO2008061763A2 - Capteur de force non susceptible de torsion comprenant une traverse dans l'ouverture centrale - Google Patents

Capteur de force non susceptible de torsion comprenant une traverse dans l'ouverture centrale Download PDF

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Publication number
WO2008061763A2
WO2008061763A2 PCT/EP2007/010144 EP2007010144W WO2008061763A2 WO 2008061763 A2 WO2008061763 A2 WO 2008061763A2 EP 2007010144 W EP2007010144 W EP 2007010144W WO 2008061763 A2 WO2008061763 A2 WO 2008061763A2
Authority
WO
WIPO (PCT)
Prior art keywords
central opening
web
force transducer
force
measuring system
Prior art date
Application number
PCT/EP2007/010144
Other languages
German (de)
English (en)
Other versions
WO2008061763A3 (fr
Inventor
Bernd Futterer
Otto Pfeffer
Original Assignee
Brosa Ag
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 Brosa Ag filed Critical Brosa Ag
Publication of WO2008061763A2 publication Critical patent/WO2008061763A2/fr
Publication of WO2008061763A3 publication Critical patent/WO2008061763A3/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
    • G01L1/2243—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being parallelogram-shaped
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0004—Force transducers adapted for mounting in a bore of the force receiving structure

Definitions

  • the present invention relates to a force transducer for measuring tensile and / or compressive forces, with a tab-shaped body which receives the force to be measured such that the force to an elastic deformation of the body or to a positive or negative strain in at least a portion the body, and with at least one electrical measuring system which is coupled to the body and which detects the deformation or the strain and converts it into an electrical signal, wherein the body in a longitudinal direction a longer dimension than in a transverse direction and in a Height direction, and wherein the body has a central opening for receiving the electrical measuring system.
  • German patent application DE 33 07 020 Al discloses an arrangement for measuring cable forces and signal transmission in shaft conveyors and elevators. Between ropes and a conveyor cage and / or a counterweight, a force measuring device is arranged, whose output signals are fed to a control arrangement, wherein various signals for monitoring a load in the individual ropes are obtained even when moving conveyors, which signals to a stationary mounted part of Arrangement are transmitted.
  • Fig. 4 DE 33 07 020 shows a cast or forged joint part in which a window or a recess with a central web is present. In the window, several wire strain gauges (strain gauges) are arranged in pairs on the central web.
  • DE 41 03 765 discloses a force transducer, which goes back to the assignee of the present application.
  • a force transducer for tensile and / or compressive forces is disclosed, which is used in practical applications for receiving and measuring tensile and / or compressive forces.
  • An application example is the measurement of very high forces in the range up to 2000 kN or above in load ropes of heavy load cranes or in heavy duty work jib supports such as excavators or cranes.
  • the force transducer embodying the present invention comprises an ishedral body which receives the force to be measured such that the force results in deformation or elongation (negative or positive) in at least a portion of the body.
  • a load cell with a lug-shaped body is also called a measuring lug.
  • a force transducer with a tab-shaped body in the region of its two longitudinal ends in each case an eye (through opening), in each of which a trailer shaft (bolt) is used, via which the load cell is attached, for example, to the support cable or the support arm whose force load can be measured should.
  • the deformation or elongation of the body caused by the tensile or compressive force is detected by an electrical measuring system connected to the body and converted into an electrical signal.
  • an electrical measuring system is usually based on, but not limited to, the invention strain gauges (DMS), wherein the effect is exploited that a wire that undergoes a change in length proportionally changes its electrical resistance as a result of the change in length.
  • DMS invention strain gauges
  • several will such strain gauges are interconnected to form a resistance bridge (Wheatstone bridge).
  • the electrical signal generated by the electrical measuring system or systems is processed in a measured value processing device, for example a measuring amplifier, wherein the current or voltage signal generated by the measuring system (s) is converted into a force value, which is then displayed in a display direction.
  • a measured value processing device for example a measuring amplifier
  • a force transducer which has a tab-shaped body which has a thickness which is smaller than the dimension of the body in the longitudinal direction and in the transverse direction.
  • This known force transducer has two electrical measuring systems arranged in a central bore from the bottom and the top, i. from the flat sides of the force transducer forth, are incorporated into the body. This corresponds to the usual way of installing the electrical measuring systems in such measuring straps.
  • the effect has often been encountered which leads to distortions of the measured signal due to torsional phenomena.
  • the torsion represents a mechanical disturbance, similar to when the force is not centric or axial.
  • the measurement results are thereby falsified. If the transverse forces or moments introduced exceed a permissible value, the measuring element may additionally be damaged.
  • the linearity and hysteresis should be improved.
  • a through opening causes the central opening to no longer contain a "membrane" on which the electrical measuring system has been conventionally mounted
  • the electrical measuring system according to the invention does not become at a distance from a center of the central opening It is also mounted on a membrane-like terminating surface which has typically divided the central opening such that the central opening has represented two opposed blind holes,
  • the electrical measuring system becomes relatively close to the center, and preferably accurately in the center, the central opening arranged.
  • torsional forces When torsional forces are introduced into the load cell of the present invention, they are preferably routed around the central web, so that the electrical measuring system is either not affected at all or at least only to a limited extent by the introduced torsional force.
  • the torsional force is mainly passed through legs which surround the central opening.
  • the web extends substantially in the longitudinal direction of the body and is connected to the body.
  • transverse recesses of the central opening flank the preferably longitudinally extending web.
  • the web is preferably formed strip-like or rod-like, which further reduces the transmission of torsional forces in comparison to a flat transmission medium.
  • the connection with the body is required to allow a force measurement.
  • the web is formed integrally with the body.
  • a thickness of the web in comparison with the strength of the body in the height direction is smaller than e.g. 1:20 is.
  • connection for transmitting the power flow is present, but on the other hand, the connection is such that torsional forces, if any, are transmitted very poorly through the web, which in turn carries the electrical measuring system.
  • the web is composed of several elements.
  • the part or the element of the web, which carries the electrical measuring system can be manufactured outside the measuring lug itself, which is of considerable advantage in particular when gluing or sputtering the strain gages.
  • the measuring cell or the part carrying the electrical measuring system can also be more easily temperature-compensated.
  • complete measuring straps, ie including the measuring strap body are usually brought into a device for heating and cooling and then heated and / or cooled.
  • only the element carrying the measuring system including the measuring system which is many times smaller than a measuring strip, has to be brought into the compensation device, wherein instead of a single measuring strip body several elements can be compensated simultaneously.
  • an element carrying the measuring system in the central opening is positively and / or non-positively.
  • a positive or non-positive recording ensures a good transfer of power flow, which in turn is required for achieving good and accurate measurement results.
  • the web opening extends substantially in the height direction.
  • the contact surfaces between the measuring cell and the body are arranged in a plane in which the power flow is substantially transmitted.
  • the web has a cross-sectional area, which preferably lies in a plane which is spanned by the longitudinal direction and the transverse direction, and wherein joints with the body may be wider than in the direction of a web center, wherein preferably the cross-sectional area at the web center is wider, and in particular broad, like the liaison offices.
  • the contour of the web is first concave, then convex and then in turn concave along the outside of the tab relative to the longitudinal axis oriented.
  • This form has proven particularly suitable for generating hysteresis-free and linear signals.
  • the web center has a circular cross-section.
  • longitudinal sides of the body along a center piece of the body, which surrounds the central opening have a contour, so that a material thickness of the body in the region of the central opening in a radial direction, within a longitudinal direction and the transverse direction spanned plane, relative to a center of the central opening does not fall below a minimum thickness, the minimum thickness is determined by the material thickness of the body in the transverse direction at the level of the center.
  • the outer contour of the force transducer similar to the central web, first concave, then convex and then in turn formed concave relative to the longitudinal axis.
  • the material thickness in the direction of longitudinal ends of the body ie within an XY plane in a central opening section, is almost constant and increases in transition sections.
  • the criterion is further satisfied that the material thickness (in the radial direction) around the central opening never falls below a minimum thickness.
  • the central opening has a substantially circular cross-section.
  • a circular central opening can be easily realized in terms of manufacturing technology, such as e.g. by milling or drilling.
  • Fig. 1 is a plan view of a force transducer according to the present invention
  • Fig. 2 is a sectional view taken along the line H-II of Fig. 1;
  • Fig. 3 is a sectional view along the line III-III of Figure 1, wherein the scale has not been retained.
  • Fig. 4 is an enlarged view of a center of the force transducer of
  • a force transducer according to the present invention will be generally designated 10.
  • FIG. 1 a top view of a force transducer 10 according to the present invention is shown.
  • the force transducer 10 has a body 12, which is preferably made of stainless steel. However, other materials may be chosen, such as e.g. Fine grain steel, because it can be fired and costs considerably less than stainless steel (1: 5 to 1:10).
  • the body 12 extends substantially along a longitudinal axis 14 and is here plate-shaped.
  • the longitudinal axis 14 coincides with a longitudinal direction X.
  • a transverse direction is perpendicular to the X-axis and will be referred to as Y-axis.
  • the body 12 has end pieces 16 and 18, which are connected to each other via a centrally located middle piece 20. To illustrate the various pieces, which are usually formed integrally, dashed lines 21 are shown.
  • the end pieces 16 and 18 each have a through opening 22 or 24 (eyes) through which, for example, bolts (tow shafts) can be guided.
  • bolts to be measured, preferably in the tensile and / or pressure direction, is introduced into the body 12. Compressive and tensile forces are oriented parallel to the longitudinal axis 14 here.
  • the centerpiece 20 has a central opening 26 for receiving an electrical measuring system.
  • strain gages are glued to the wall of the central opening 26, which extend in the Z direction, in order to be able to measure forces.
  • the central opening in the Z-direction is interrupted here by a web 28 extending, for example, in the X-direction.
  • the central opening 26 is laterally surrounded by legs 27 of the body 12.
  • the electrical measuring system such as e.g. a DMS 29 with appropriate connection to a signal evaluation unit (not shown), be arranged on the web 28.
  • the DMS 29 is arranged in particular almost in the center of the central opening 26.
  • the diameter of the central opening 26 can be made smaller or the distance between the central opening 26 to the respective openings 22 and 24 in the end pieces 16 and 18 smaller than in the prior art, while maintaining the same load capacity the measuring flap 10 itself.
  • the measuring zone ie the area within which the DMS 29 is arranged, sits relatively far inside, the measuring tab 10 torsionsunlengther than known measuring straps.
  • FIG. 2 a section along the line H-II in Fig. 1 is shown. The scale was maintained here.
  • Fig. 3 is a section along the line III-III of Fig. 1 is shown, wherein the Fig. 3 has been enlarged in scale.
  • Fig. 3 it can be seen that the DMS 29 can be glued on both sides of the web 28. However, only one side of the web 28 can be covered with one or more DMS.
  • the connections of the DMS 29 to their corresponding evaluation electronics is not explicitly shown in any of the figures, but always considered to be present.
  • the centerpiece 20 of FIG. 1 is shown in more detail.
  • the web 28 is connected to a wall 46 of the central opening 26 at connection points 36.
  • the wall 46 represents the inner surface of the central opening 46.
  • the wall 46 is cylindrical here, with the cylinder axis extending in the Z direction here.
  • the web 28 is preferably formed integrally with the body 12 and extends substantially eg in the X direction. Alternatively, it could also extend in a different direction within the XY plane, eg also in the Y direction.
  • the web can also be subsequently connected to the body 12, such as by welding. This will be discussed in detail below.
  • the web 28 here has a circular central surface 38 on which the strain gages 29 can be mounted.
  • the middle surface 38 is lowered relative to the rest of the web (see also Fig. 3), so that around the central surface 38 around a raised edge 40 is formed.
  • contours of the web 26 shown in the figures could also be chosen differently. For example, only a rectilinear plate could be used that does not have the concave / convex contour shown in FIG. 4.
  • the web 28 can be easily recognized again by continuous recesses which are laterally surrounded by the reference numerals 42 and 44.
  • the recesses 42 and 44 are mainly responsible for the fact that the force transducer according to the present invention is less susceptible to torsion, since it breaks through a membrane-like separation of the central opening.
  • the specially shaped outer contours 30 and 32 of the body 12 can be seen, which are partly responsible for a linear and hysteresis-free operation of the force transducer 10.
  • the legs 27 which surround the central opening 26, 26 at the level of the center of the central opening in radial direction to a minimum thickness or thickness S min , which is not exceeded in the direction of the end pieces 16 and 18, not shown in Fig. 4.
  • a material thickness S ie the thickness of the body 12 in the XY plane, remains constant at least in the vicinity of the central opening 26, ie it is equal to the minimum thickness S min .
  • transition sections 52 adjoin. In the transition sections 52, the material thickness increases further, as it results in a comparison with an auxiliary circuit 49.
  • the outer contour of the body 12 shown in Fig. 4 is merely exemplary.
  • the minimum strength is chosen to be relatively small here.
  • the minimum thickness could also be chosen much larger, so that the longitudinal sides 30 and 32 - not concave-convex-concave as in Fig. 4 - but only convex.
  • FIG. 5a an element 60 is shown isometrically, which forms a component of an alternative web 28 ', which is installed in Fig. 5b in a measuring tab and shown in a sectional side view.
  • Fig. 5c shows a plan view of the arrangement of Fig. 5b.
  • Figures 5a-5c show the modular ridge 28 'which is similar to the ridge 28 of Figure 4, but with the difference that the ridge 28' may consist of several components (element 60, protrusions, etc.).
  • the element 60 of Fig. 5a has a hat-like cross-section.
  • the hat-like cross-section here has two attachment sections 62a, 62b with openings 64.
  • the number of openings 64 can be chosen freely.
  • the openings are continuous and preferably provided with an internal thread, for example, to accommodate suitable screws 66 (see Fig. 5b). With the screws 66, the member 60 can be fixedly secured to protrusions 68 projecting radially into the central opening 26.
  • the projections 68 are provided with corresponding holes in order to accommodate the screws 66 can.
  • the projections have one Function comparable to a bridgehead. They serve to receive the opening spanning element 60 and are part of the web 28 '.
  • the strain gages 29 can be arranged in the middle region of the hat-like cross-section. It is irrelevant whether the DMS 29 are arranged on the top or bottom of the element 60.
  • the hat-like cross-section gives the element 60 "springy" functionality, making it less sensitive to impact and the like.
  • the element 60 could also be realized in the form of a straight plate, i. without lowering in the middle range.
  • Fig. 5c the plan view of the multi-piece web 28 'is shown in an assembled state.
  • the lowered portion of the element 60 preferably does not contact the projections 64, as indicated by a dashed auxiliary line in FIG. 5c.
  • this detail is not visible.

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

Abstract

L'invention concerne un capteur de force (10) servant à mesurer des forces de traction et/ou de compression et comprenant un corps (12) en forme de plaquette qui capte la force à mesurer de sorte que cette force entraîne une déformation élastique du corps (12) ou une extension positive ou négative dans au moins une zone partielle du corps (12). Le capteur de force selon l'invention comprend également au moins un système de mesure électrique (29) qui est couplé au corps (12) et qui détecte la déformation ou l'extension et la transforme en un signal électrique. Le corps (12) a en sens longitudinal (14; X) une dimension plus grande qu'en sens transversal (Y) et qu'en hauteur (Z) et il présente une ouverture centrale (26) pour le logement du système de mesure électrique (29). Cette ouverture transversale (26) du corps (12) est traversante dans le sens de la hauteur (Z) et est barrée par une traverse (28) qui peut être reliée au système de mesure électrique (29).
PCT/EP2007/010144 2006-11-22 2007-11-22 Capteur de force non susceptible de torsion comprenant une traverse dans l'ouverture centrale WO2008061763A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006057258.0 2006-11-22
DE200610057258 DE102006057258B4 (de) 2006-11-22 2006-11-22 Torsionsunanfälliger Kraftaufnehmer mit Steg in Zentralöffnung

Publications (2)

Publication Number Publication Date
WO2008061763A2 true WO2008061763A2 (fr) 2008-05-29
WO2008061763A3 WO2008061763A3 (fr) 2008-09-18

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DE (1) DE102006057258B4 (fr)
WO (1) WO2008061763A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6912847B1 (ja) * 2021-02-18 2021-08-04 株式会社アデック 荷重センサ及び金型用荷重分布測定装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014007376A1 (de) 2014-05-21 2015-12-17 Tecsis Gmbh Messglied zur Messung von Kräften
JP6543686B1 (ja) * 2017-12-26 2019-07-10 ミネベアミツミ株式会社 荷重センサおよび荷重センサ一体型多軸アクチュエータ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628747A (en) * 1984-10-22 1986-12-16 Weitz Gene C Method and apparatus for measuring tension
DE4103765A1 (de) * 1991-02-08 1992-08-13 Erich Brosa Zugkraftaufnehmer
DE19744032A1 (de) * 1997-10-06 1999-04-08 Siemens Ag Einrichtung zur Messung der Zugkraft in einem Metallband
US20050081652A1 (en) * 2003-10-21 2005-04-21 Jon Scott Load Cell Having Improved Linearity and Temperature Transient Behavior

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318618A1 (de) * 1973-04-13 1974-11-07 Krupp Gmbh Istwertgeber, insbesondere fuer lastmomentbegrenzungs-einrichtungen von kranen od. dgl
DE3307020A1 (de) * 1983-02-28 1984-08-30 ASEA AB, Västeraas Anordnung zur messung von seilkraeften
DE10060201C2 (de) * 2000-11-27 2003-01-09 Erich Brosa Messgeraete Gmbh Kraftaufnehmer für Zug- und/oder Druckkräfte
DE102005005354A1 (de) * 2005-02-05 2006-08-10 Bosch Rexroth Aktiengesellschaft Kraftmessvorrichtung und Dehnungsmesselement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628747A (en) * 1984-10-22 1986-12-16 Weitz Gene C Method and apparatus for measuring tension
DE4103765A1 (de) * 1991-02-08 1992-08-13 Erich Brosa Zugkraftaufnehmer
DE19744032A1 (de) * 1997-10-06 1999-04-08 Siemens Ag Einrichtung zur Messung der Zugkraft in einem Metallband
US20050081652A1 (en) * 2003-10-21 2005-04-21 Jon Scott Load Cell Having Improved Linearity and Temperature Transient Behavior

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6912847B1 (ja) * 2021-02-18 2021-08-04 株式会社アデック 荷重センサ及び金型用荷重分布測定装置
JP2022126063A (ja) * 2021-02-18 2022-08-30 株式会社アデック 荷重センサ及び金型用荷重分布測定装置

Also Published As

Publication number Publication date
WO2008061763A3 (fr) 2008-09-18
DE102006057258B4 (de) 2010-04-08
DE102006057258A1 (de) 2008-05-29

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