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WO2008125099A2 - Structure de bras oscillants parallélépipédique, en particulier structure de bras oscillants parallélépipédique monolithique pour dispositif de pesée - Google Patents

Structure de bras oscillants parallélépipédique, en particulier structure de bras oscillants parallélépipédique monolithique pour dispositif de pesée Download PDF

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Publication number
WO2008125099A2
WO2008125099A2 PCT/DE2008/000635 DE2008000635W WO2008125099A2 WO 2008125099 A2 WO2008125099 A2 WO 2008125099A2 DE 2008000635 W DE2008000635 W DE 2008000635W WO 2008125099 A2 WO2008125099 A2 WO 2008125099A2
Authority
WO
WIPO (PCT)
Prior art keywords
parallelogram
solid
joints
state
parallelogrammlenkerstruktur
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/DE2008/000635
Other languages
German (de)
English (en)
Other versions
WO2008125099A3 (fr
Inventor
Timo Hauck
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.)
Wipotec Wiege und Positioniersysteme GmbH
Original Assignee
Wipotec Wiege und Positioniersysteme 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 Wipotec Wiege und Positioniersysteme GmbH filed Critical Wipotec Wiege und Positioniersysteme GmbH
Publication of WO2008125099A2 publication Critical patent/WO2008125099A2/fr
Publication of WO2008125099A3 publication Critical patent/WO2008125099A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G21/00Details of weighing apparatus
    • G01G21/24Guides or linkages for ensuring parallel motion of the weigh-pans
    • G01G21/244Guides or linkages for ensuring parallel motion of the weigh-pans combined with flexure-plate fulcrums

Definitions

  • the invention relates to a Parallelogrammlenlcer Modell, in particular a monolithic Parallelogrammlenker Modell for a Wägeaufsacrificing, with the features of the preamble of claim 1. Furthermore, the invention relates to a weighing transducer, in particular for an electronic balance according to the principle of force compensation, with such a Parallelogrammlenker Modell.
  • Such a parallelogram linkage structure is usually produced by an upper and a lower link, which are plane-parallel to each other.
  • the parallelogram links are connected by means of thin material points, which represent solid-state joints, to the stationary part of the weighing receiver and to load-bearing.
  • the thin joints forming the solid joints provide for a lower rigidity of the parallelogram in the measuring direction, that is, in the translational direction, in which the parallelogram linkage structure allows a shift of the load receiving.
  • the rigidity of the parallelogram linkage in the measuring direction is determined by the thickness of the thin points and the adjoining the thin locations geometry of the solid-state joints and their width.
  • the solid-state joints In the direction of the joint axes formed by the solid-state joints, the solid-state joints usually have a constant cross-section. This results in a simple production of solid joints, for example by drilling, milling or erosion.
  • the invention is therefore an object of the invention to provide a parallelogram link structure, which in the direction of the measuring direction has a low rigidity and at the same time an improved torsional rigidity, so the parallelogram linkage structure is also suitable for a weighing picker for detecting low load forces. Furthermore, the invention has for its object to provide a corresponding Weighing.
  • the invention is based on the recognition that by using at least two separate solid-body joints at at least one end of a parallelogram link, a higher stiffness with respect to torques about rotational axes that do not coincide with the parallel joint axes can be achieved, if the longitudinal extension planes of the solid-state links include an angle other than zero.
  • the joint axes of the at least two solid-state joints must of course be aligned in order to allow the desired movement of the parallelogram structure in the measuring direction, without the parallelogram structure twisting.
  • the plane of symmetry is to be understood as the longitudinal plane of a solid in the case of a symmetrical solid-body joint. In the case of asymmetrically designed solid-state hinges, this may mean a plane passing through the thin layer, wherein in the case of a linear thin layer, that is, the side walls of the thin spot each have a straight line (or straight line) at a constant distance, perpendicular to the Distance between the two thin lines defining straight line is.
  • the stiffness in the desired direction of movement can thus be achieved by the use of very thin thin points of the solid-state joints, i. be made possible by thin sections with a small cross-section in the region of the hinge axis, at the same time high rigidity to other than the hinge axes.
  • a parallelogram structure with two solid joints on at least one end of a parallelogram link.
  • the total width of the solid-state joints (in particular their thin points) can coincide with the entire width of the Parallelogrammlenker Modell or the relevant Parallelogrammlenkers.
  • the total width of the solid-state joints can of course also be chosen to be less than the total width of the parallelogram link structure or of the relevant parallelogram link.
  • the width and / or the geometry of the solid-state joints - and in particular of their thin points - can be equal or, in order to increase stiffness relative to defined, eccentric loads, unequal.
  • Each parallelogram link may be formed (on a plane) by individual - not interconnected - (in a plane adjacent) Parallelogrammlenkerieri, wherein at least one solid-body joint is formed at each end of the Parallelogrammlenkerelements.
  • the individual Parallelogrammlenkerieri can also be interconnected, for example by one or more webs.
  • the desired high stiffness will arise in particular in those embodiments in which each of the parallelogram is formed integrally or monolithically, or wherein individual, located in a plane parallelogram link elements are firmly connected to each other.
  • At least two solid-body links are respectively provided at each of both ends of one or both (or all) parallelogram links, the longitudinal extension planes of at least two of these solid-state links enclosing an angle not equal to zero.
  • each of the at least two solid-state joints at one end of a parallelogram seen in the longitudinal extension direction of the parallelogram, opposite one of the at least two solid-state joints on each arranged at the other end of the relevant parallelogram (or the relevant Parallelogrammlenkerelements), ie the center planes of the opposing solid joints (which are perpendicular to the respective longitudinal plane) are substantially aligned.
  • a symmetrical parallelogram link structure and a symmetrical behavior of the parallelogram link structure relative to introduced forces can be achieved in a simple manner.
  • a first of the provided at one or both ends of the or the parallelogram link at least two solid-state joints on a longitudinal extension plane, which is spanned with the plane which is defined by the two axes of articulation of the respective parallelogram provided solid state joints, a first Angle ⁇ includes.
  • a second of the provided at each end of the parallelogram at least two solid-state joints on a longitudinal extension plane, which encloses a second angle ß with the plane which is stretched by the two axes of articulation of the respective parallelogram link provided solid state joints.
  • the angles .alpha. And .beta. are defined as those angles which are enclosed by the parallelogram side, which lies between the two opposite joint axes of the relevant parallelogram link, and the part of the respective longitudinal extension plane which extends completely above or completely below the parallelogram.
  • the respective first solid-body joints, to which the angle ⁇ is assigned can be seen substantially opposite one another at both ends of a parallelogram link, viewed in the direction of the longitudinal extent of the parallelogram link.
  • a small offset in the transverse direction of the parallelogram is quite permissible.
  • the respective first solid-state joints at one of the two ends of a parallelogram viewed in the longitudinal direction of the parallelogram, substantially opposite to the respective second solid joints at the other end of the respective parallelogram.
  • This embodiment ensures optimal rigidity against torques about an axis pa. rallel to the longitudinal direction of the respective parallelogram.
  • This embodiment will also be selected, in particular, if the parallelogram link consists of a plurality of mutually separate parallelogram link elements, at the ends of which a single solid-body joint is provided in each case.
  • the positions of the first and second solid-state joints provided on the one parallelogram link may be interchanged with respect to the corresponding positions of the first and second solid-state links provided on the other of the parallelogram links.
  • the longitudinal extension planes of the at least two solid-state hinges can be perpendicular to one another at at least one end of a parallelogram link. This results in a maximum stiffness for torques about any axis, except those axes that are parallel to the joint axes of the solid state joints.
  • the longitudinal extension plane of one of the solid-state hinges at the one or more ends of the parallelogram link or links can be aligned with the plane defined by the joint axes on either side of the relevant parallelogram link.
  • the parallelogram linkage structure is formed as a monolithic parallelogram linkage structure, that is, the parallelogram links, the solid state links and the rigid elements are monolithic.
  • Such a Parallelogrammlenker Weg is particularly suitable for a weighing receiver, in particular for an electronic balance according to the principle of force compensation, wherein a first of the two rigid elements is held stationary and wherein the second of the two rigid elements is designed to initiate a weight to be measured, that is making load pickup.
  • a weighing device may comprise in the usual way at least one force transmission and / or force reduction element, which is connected to the second rigid element, which forms the load receptacle of the weighing Aufhehmers.
  • the force transmission and / or power reduction element serves to transmit the weight to be detected or to reduce the weight on a measuring and / or display device.
  • a power transmission and / or power reduction element may be formed, for example, as a coupling rod or as a lever. It should be understood in the context of the present description under power reduction and a power transmission.
  • Such a power transmission and / or power reduction element will, as far as possible also monolithic train with the Parallelogramm Quilt and arrange within the parallelogram. If the provision of the measuring and / or display device within the parallelogram is not possible, then a corresponding force transmission and / or force reduction element can also lead out of the parallelogram area, at least partially.
  • the last lever arm can be guided past the parallelogram structure on the side (divided into two on either side or asymmetrically on one side).
  • the subject power transmission and / or power reduction element (or part thereof) may be detachably connected to the power transmission and / or power reduction elements monolithically formed with the parallelogram structure, for example by bolting.
  • the last lever arm may also be led out of the parallelogram through one of the rigid elements on the parallelogram sides or through the parallelogram links.
  • FIG. 1 shows a side view of a first embodiment of a parallelogram structure according to the invention
  • FIG. 2 shows a perspective view of the embodiment in FIG. 1;
  • Fig. 3 is a perspective view of a Weighing Hinge with a parallelogram structure according to Figures 1 and 2, and
  • FIG. 4 shows a perspective embodiment of a weighing jack with a further embodiment of a parallelogram structure according to the invention.
  • the monolithic parallelogram structure 1 shown in FIG. 1 comprises a first rigid element 3, which is designed for use of the parallelogram structure 1 in a weighing holder for stationary mounting and has an extension 5 for receiving a measuring and / or display device, not shown.
  • the parallelogram structure 1 has a second rigid element 7, which is connected to the first rigid element 3 via two parallelogram links 9, 11.
  • the second rigid element 7 may be designed to use the monolithic parallelogram structure 1 for a weighing device as a load-receiving device.
  • the parallelogram links 9, 11 are integrally connected to the first and second rigid elements 3, 7 by means of solid joints arranged at each end of the parallelogram links 9, 11.
  • the solid-state joints (13a, 13b and 15a, 15b) of the upper parallelogram link have longitudinal extension planes, each of which lies in the plane of symmetry of the thin-point regions produced by two holes each.
  • the axes of articulation are in each case in the center of the thin point in question (seen in cross-section), that is to say the axes of articulation are in each case parallel to the lines of the outer walls of the thin-area regions which are at the minimum distance from one another, in the middle of the distance.
  • the joint axes are thus in the relevant longitudinal plane of the solid body joint in question.
  • the longitudinal extension planes of the solid-body joints 13b and 15a of the upper parallelogram link 9 each extend horizontally or, in this case, the longitudinal extension planes of the solid-state joints 13b and 15a are identical to the plane defined by the joint axes of these solid-state joints 13b and 15a is spanned.
  • the longitudinal extension planes of the solid-body joints 13a and 15b of the upper parallelogram link 9 extend vertically, that is, these longitudinal extension planes are perpendicular to the longitudinal extension planes of the solid-state joints 13b and 15a.
  • This diagonal arrangement of the solid-body joints (in plan view), each with the same longitudinal plane, results in a very good torsional stiffness in the articulated connection of the second rigid element 7 to the first rigid element 3 with respect to torques about an axis which is not parallel to the joint axes.
  • connection of the second rigid element 7 to the first rigid element 3 via the lower parallelogram link 11 has been selected in the embodiments illustrated in FIGS. 1 and 2 such that the solid-state joints 17a, 17b or 19a, 19b are opposite corresponding positions of the solid-state joints 13a, 13b and 15a, 15b each have longitudinal extension planes with the respective other orientation. That is, the solid-state joints 17a, 19b have a horizontally extending longitudinal extension plane, while the longitudinal extension planes of the solid-state joints 17b, 19a extend vertically.
  • the longitudinal extension planes could also be chosen differently. However, if a certain symmetrical behavior of the parallelogram with respect to defined torques are achieved, it is recommended that the longitudinal extension planes of the two solid joints 13, 15, 17, 19 each one end of a parallelogram 9, 11 each at a defined angle ⁇ or ß with respect to a reference plane, ie, a first of the solid-state joints has a longitudinal extension plane including a first angle ⁇ with the reference plane, while a second one of the solid state joints has a longitudinal extension plane including a second angle ⁇ with the reference plane.
  • that plane E can be selected as the reference plane, which is spanned by the two hinge axes of the solid state joints 13 (13a, 13b) and 15 (15a, 15b).
  • the plane E (or the portion between the joint axes of Solid joints 13, 15) with the part of the longitudinal extension plane of the solid-state joint 13a includes, which extends completely above the parallelogram, which is formed (in cross section) by the four hinge axes.
  • the conditions for the solid-body joints 15a, 15b at the opposite end of the parallelogram 9 are in the embodiment of Figures 1 and 2 exactly the opposite.
  • ⁇ and ⁇ always denote that angle which is enclosed by the part of the plane between the two joint axes and the part of the relevant longitudinal extension plane lying completely below the parallel program.
  • the widths of the thin joints of the solid-state joints 13, 15, 17, 19 which are respectively chosen to be the same in the embodiment according to FIGS. 1 and 2 do not necessarily have to be always the same width. If, for example, the load receiver is always (or predominantly) subjected to a load asymmetrically in a defined manner (ie the load is not introduced with the center of gravity in the longitudinal center plane of the parallelogram structure), an asymmetrical choice of the widths of the thin joints of the solid-body joints can also be advantageous be.
  • FIG. 3 shows a weighing transducer 20 which has a monolithic parallelogram structure 1 according to FIGS. 1 and 2.
  • the first rigid element 3 represents the stationary part of the weighing jack 20, and the second rigid element 7 constitutes the (movable) load receptor.
  • a monolithically designed with the parallelogram lever 22 is provided, which is connected via a coupling rod 24 to a extending within the parallelogram portion of Lastaufhehmers.
  • the coupling rod 24 is connected via a respective solid-state joint with the load receptor and with the short lever arm of the lever 22.
  • the axis of rotation of the lever 22 is also connected via a fixed body joint 28 defined.
  • a holder for receiving a measuring device (not shown) or parts thereof is provided.
  • the foot region of the stationary part 3 is integrally formed with a base plate 26, with which the weighing device can be mounted, for example, in a balance housing (not shown).
  • this foot region of the stationary part 3 is not connected massively to the bottom plate 26, as in the embodiment according to FIG. 4, but via three solid joints 30 which are located between the outer wall of the foot region of the stationary part 3 and the inner wall of a breakthrough in the bottom plate 26 extend. Only one of the two longitudinally provided solid-body joints 30 and the solid-body joint provided in the broad side of the opening is visible in FIG.
  • the joint axes of the solid state joints 30 are perpendicular to the plane of the bottom plate 26, so that when a load is applied to the load receptor or the rigid part 7 of the parallelogram 1 in just this direction no unwanted tilting of the load receptor occurs.
  • This feature of connecting the bottom plate to the remaining parts of a weighing sensor via at least three solid joints may of course be used without the special configuration of the parallelogram structure according to the present invention.
  • the weighing pickup 20 shown in FIG. 4 differs from the weighing pickup shown in FIG. 3 - except for a conventional solid connection of the foot region of the stationary part 3 to the bottom plate 26 - only by the arrangement of FIGS Parallelogramm Quilt Design 1.
  • the opposing solid joints of the parallelogram 9 and 11 each have a horizontal or vertical longitudinal extension plane.
  • the (in plan view) diagonal arrangement of the solid state joints 13 and 15 of FIG. 1 to 3 is thus replaced by the symmetrical arrangement of FIG. 4 (symmetrical with respect to a vertical median plane of the parallelogram 9 and 11, transverse to the longitudinal direction of the parallelogram 1 runs.
  • the solid joints of the lower parallelogram 11 are selected with respect to their longitudinal plane so that the longitudinal plane each perpendicular to the longitudinal plane of the concerned solid body joint 13, 15, 17, 19 is at the corresponding position of the upper parallelogram 9.
  • FIGS. 3 and 4 of a weighing receiver 20 or a monolithic parallelogrammic linkage structure 1 each having two solid-state joints at each end of the upper and lower parallelogram links 9, 11 represent embodiments that are important in practice since they are relatively simple to manufacture and have a largely symmetrical characteristic of the parallelogram link structure 1.
  • each of the parallelogram 9 or 11 by two or more parallelogram parts, which can be generated by a separation of the parallelogram shown in the figures 9, 11 in the longitudinal direction.
  • such a complete separation of a parallelogram in several Parallelogrammlenkerieri can offer the advantage that between them a power transmission and / or power reduction element can be brought out, or that can be intervened for the production in this area with appropriate tools in the interior of the parallelogram.
  • a fully monolithic design of the parallelogram link structure has advantages in terms of mechanical and thermal stability, however, a partial monolithic design of the parallelogram link structure may also be advantageous or even necessary for production-related reasons.
  • one or more solid joints with adjoining parts of the rigid elements, 3, 7 or the parallelogram 9, 11 may be monolithic. These sub-elements can then be combined with other parts to an entire parallelogram link structure, both by releasably and non-detachably connecting the individual components.
  • the parallelogram 7, 9 or Parallelogrammschmaschine with the provided at one or both ends solid joints and adjoining parts of the rigid elements 3, 7 may be monolithic.
  • the parallelogram linkage structure may also be made "sliced", ie, the parallelogram link structure 1 is divided in the longitudinal plane into discrete monolithic parallelogrammic link structure elements, for example, each of these monolithic parallelogram link structure elements comprising the parallelogram link elements, at least one solid-state link at each end, and portions of the rigid element
  • the individual parallelogram link structure elements are much easier to manufacture than an overall monolithically produced parallelogram link structure, wherein the individual parallelogram link structure elements may, for example, only have solid-body articulations, along with the longitudinal extension planes identical angles ⁇ or ß possess.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gyroscopes (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Prostheses (AREA)

Abstract

La présente invention concerne une structure de bras oscillants parallélépipédique monolithique destinée en particulier à un dispositif de pesée monolithique, comprenant deux bras oscillants (9, 11) formant un parallélogramme parallèles entre eux, chacun des bras oscillants (9, 11) étant relié respectivement par au moins une articulation solide (13a, 13b; 15a, 15b; 17a, 17b; 19a, 19b) à chacune des deux extrémités de chaque bras oscillants (9, 11) respectivement à un élément rigide (3, 7), les quatre articulations solides (13a, 13b; 15a, 15b; 17a, 17b; 19a, 19b) étant parallèles et formant en section transversale les sommets d'un parallélogramme. Selon l'invention, au moins une extrémité d'un bras oscillant (9, 11) est reliée par au moins deux articulations solides (13a, 13b; 15a, 15b; 17a, 17b; 19a, 19b) à l'élément rigide (3, 7) concerné, les plans d'extension longitudinale des articulations solides formant entre eux un angle (α, ß) non nul, et les axes des articulations solides (13a, 13b; 15a, 15b; 17a, 17b; 19a, 19b) étant alignés. L'invention concerne également un dispositif de pesée comprenant une structure de bras oscillants parallélépipédique monolithique de ce type.
PCT/DE2008/000635 2007-04-17 2008-04-16 Structure de bras oscillants parallélépipédique, en particulier structure de bras oscillants parallélépipédique monolithique pour dispositif de pesée Ceased WO2008125099A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710018422 DE102007018422B4 (de) 2007-04-17 2007-04-17 Parallelogrammlenkerstruktur, insbesondere monolothische Parallelogrammlenkerstruktur für einen Wägeaufnehmer
DE102007018422.2 2007-04-17

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WO2008125099A2 true WO2008125099A2 (fr) 2008-10-23
WO2008125099A3 WO2008125099A3 (fr) 2009-01-15

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PCT/DE2008/000635 Ceased WO2008125099A2 (fr) 2007-04-17 2008-04-16 Structure de bras oscillants parallélépipédique, en particulier structure de bras oscillants parallélépipédique monolithique pour dispositif de pesée

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WO (1) WO2008125099A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751101A (zh) * 2020-07-03 2020-10-09 北京无线电测量研究所 一种形变试验传力机构及含有其的形变试验装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019113001A1 (de) 2019-05-16 2020-11-19 Wipotec Gmbh Monolithischer Wägeblock

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Publication number Priority date Publication date Assignee Title
DE1817435A1 (de) * 1968-12-30 1970-07-16 Driver Southall Waage
US4179004A (en) * 1978-02-15 1979-12-18 National Controls, Inc. Force multiplying load cell
US5513828A (en) * 1991-10-09 1996-05-07 Advanced Fuel Research, Inc. Vibration immunizing dynamic support structure
DE10054847C2 (de) 2000-11-04 2002-10-17 Sartorius Gmbh Wägeaufnehmer mit Justiergewicht
DE102005005369C5 (de) * 2005-02-05 2010-01-21 Sartorius Ag Wägesystem

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751101A (zh) * 2020-07-03 2020-10-09 北京无线电测量研究所 一种形变试验传力机构及含有其的形变试验装置
CN111751101B (zh) * 2020-07-03 2022-02-01 北京无线电测量研究所 一种形变试验传力机构及含有其的形变试验装置

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DE102007018422A1 (de) 2008-10-23
DE102007018422B4 (de) 2014-01-09
WO2008125099A3 (fr) 2009-01-15

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