EP4256285A1 - Corps structural d'un capteur de pesée - Google Patents

Corps structural d'un capteur de pesée

Info

Publication number
EP4256285A1
EP4256285A1 EP21831254.4A EP21831254A EP4256285A1 EP 4256285 A1 EP4256285 A1 EP 4256285A1 EP 21831254 A EP21831254 A EP 21831254A EP 4256285 A1 EP4256285 A1 EP 4256285A1
Authority
EP
European Patent Office
Prior art keywords
structural body
leg
movable leg
transverse
lever arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21831254.4A
Other languages
German (de)
English (en)
Inventor
Hans-Rudolf Burkhard
Bruno Lüchinger
Andreas Metzger
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.)
Mettler Toledo Schweiz GmbH
Original Assignee
Mettler Toledo Schweiz 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 Mettler Toledo Schweiz GmbH filed Critical Mettler Toledo Schweiz GmbH
Publication of EP4256285A1 publication Critical patent/EP4256285A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/28—Frames, Housings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/24—Guides or linkages for ensuring parallel motion of the weigh-pans
    • G01G21/244—Guides or linkages for ensuring parallel motion of the weigh-pans combined with flexure-plate fulcrums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/005—Means for preventing overload
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G01G7/02—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G01G7/02—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action
    • G01G7/04—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action with means for regulating the current to solenoids

Definitions

  • the invention relates to a structural body of a weighing sensor with Roberval mechanism, in particular for a weighing sensor according to the electromagnetic force compensation principle, and a method for its production.
  • the invention relates to a body structure of a weight sensor with Roberval mechanism, comprising a first part with the fixed leg of the Roberval mechanism, a second part with the movable leg of the Roberval mechanism, a third part with the upper link of the Roberval -Mechanism, a fourth part with the lower link of the Roberval mechanism, a fifth part with a lever assembly connecting the movable leg to an output side serving for sensory measurement, and a sixth part with a coupler coupling the movable leg to the lever assembly.
  • Such structural bodies of weighing sensors are well known in the prior art, and there is a tendency in the prior art to design the structural bodies as compact as possible so that they require as little space as possible in a weighing device using the weighing sensor, and thus in particular for Applications are suitable in which the weighing device has a plurality of such weighing sensors.
  • the weighing sensors should also have the highest possible weighing accuracy.
  • structural bodies in the form of a so-called monoblock have been developed in the prior art and have essentially become established in this form, as disclosed, for example, in DE 196 05 087 A1 or EP 2 397 824 A1.
  • Such structural bodies are produced by starting from a cuboid block of material of, for example, relative dimensions approximately the shape of a VHS video cassette, the long side of which corresponds to the longitudinal direction to which the links of the Roberval mechanism are parallel, the second longest side of which runs in the load direction , so that the two end areas with respect to the longitudinal direction belong on the one hand to the fixed and on the other hand to the mobile leg of the Roberval mechanism.
  • the monoblock is given a structure such that the links are defined above and below and of the legs and these above and below running links of the Roberval mechanism is divided into different functional areas, namely on the one hand belonging to the fixed leg areas and on the other hand a lever arrangement with usually one, two or three levers are formed, which are mounted on the fixed leg via appropriate bearings and with are connected to the movable leg or possibly between the levers by so-called couplers.
  • the separation between the levers and the material belonging to the fixed leg lies in essentially only thin dividing lines (the advantages of which are described, for example, in DE 41 19 734 A1), since due to the measuring principle after the electromagnetic force compensation, a significant one that exceeds the dimension of the dividing line Movement of the lever does not occur anyway.
  • the last lever in the force transmission path typically has two transverse bores, via which a lever extension is mounted, on the free end area of which the coupling to the electromagnetic force compensation and the position sensor required for this weighing principle is provided, as is well known to those skilled in the art.
  • the invention is based on the object of developing a structural body of the type mentioned again in the direction of a satisfactory combination of the smallest possible space and the highest possible weighing accuracy.
  • At least one area of the space occupied by the structural body which conventionally only is used for exactly one functional part of the structural body, can now be used by at least two different functional parts, or an equivalent support structure with different directions of extent can be created while saving material.
  • the area in the topology of a handle body the space formed by the hole in the handle body is used to provide other functional parts with targeted access to a spatial area that is considered desirable for an optimized path for the flow of the introduced force.
  • the load receptor of the movable leg can be positioned more variably and still be supported in a favorable manner by passing support struts through regions of the fixed leg which are formed in the topology of a handle body.
  • Sections of the upper link can also be guided, for example, through areas of the movable leg, which also brings with it greater flexibility in the positioning of the load receiver, or enables more reliable support and an improved force transmission path of the structural body.
  • the last lever of the lever arrangement can be guided, for example, through a previously inaccessible area of the fixed leg, so that a simplification of the lever arrangement can be achieved through to the coupling to the electromagnetic force compensation.
  • areas of the functional parts in the topology of a handle body in particular also of gender two or more, it is also possible to reduce the overall weight while maintaining the same rigidity and thus smaller dimensions of the structural body, so that, based on the same weight of the structural body, greater compactness is also achieved and/or lower material requirements are achieved.
  • areas of the fixed leg in a structure consisting of a large number of struts can consist of a plurality of longitudinal struts extending predominantly in the longitudinal direction, a plurality of vertical struts in a number predominantly running in the load direction and a plurality of transverse struts in a number predominantly running in the transverse direction running extension are formed instead of solid trained areas.
  • the one-piece nature of the connection also ensures that no additional space is required for mechanical connections or adapters for linking two integrally connected areas are required; in this regard, the invention still has advantages of the monobloc technology explained above.
  • an example of the topology of a handle body of gender one is a torus (doughnut), whereby due to the topological property of the handle body the shape of the boundary of the “hole” (or several holes) is not important, for example also represents a closed frame, is an example of a handle body of at least gender one.
  • the topology of the handle body of one or more of the functional parts is achieved by a frame-like arrangement of three or more struts.
  • the invention also provides a structural body according to the preamble of claim 1, which has at least 12, also 16, in particular 24 longitudinal struts, at least 4, also 2 vertical struts and at least 4, also 8 transverse struts as defined above. At least 8, in particular at least 16 of them can preferably be provided as diagonal struts, that is to say with an extent in one direction that is smaller by order of magnitude compared to the extent in the other two directions.
  • functional parts can also be mutually intertwined, so the penetrating section can be part of an intertwined with the penetrated area area of also the topology of a handle body of at least gender one.
  • a configuration may also be provided in which a hole of such a portion of a functional part is penetrated by a penetrating portion of the same functional part.
  • designs are also envisaged in which components of two different functional parts together form an area of the topology of a handle body of at least gender one, which is penetrated by a penetrating section of one of these functional parts or yet another functional part.
  • a portion of the moveable leg could penetrate a frame structure formed by the upper link and the fixed leg.
  • the gender of the handle body of the penetrated portion may be two or more, and at least one other hole may be pierced by the other part and/or yet another part of the first to sixth parts integrally connected to the penetrated portion . It is also contemplated that each hole of the handle body is penetrated by a portion of a different part.
  • At least one further part from the first to fifth parts has an area of the topology of a handle body of at least gender one, the at least one hole of which is integral with this area of the further part connected (and towards this further part) others is penetrated by the first to sixth parts.
  • multiple penetrations can be provided, and the above-explained joint partial use of a local spatial area can be implemented multiple times at different locations.
  • the first part has such an interpenetrated portion of the topology of a handle body of at least gender one. More preferably, the fifth part has such an interpenetrated region of topology of a handle body of at least gender one.
  • the second part also has such a penetrated area of the topology of a handle body of at least gender one. It can also preferably be provided that the third part also has an area penetrated by the topology of a handle body of at least gender one.
  • first to fifth parts have an area of the topology of a handle body of gender significantly higher than one, the holes of which are partially or even predominantly not penetrated.
  • first part preferably has an area of the topology of a handle body of at least gender two, more preferably at least gender four, in particular at least gender eight, but it could also have the topology of a handle body of at least gender twelve, sixteen, even at least gender twenty-four .
  • the second portion preferably has a portion of the topology of a handle body of at least gender two, preferably at least gender four, especially at least gender eight.
  • the third and/or the fourth part preferably has an area of the topology of a handle body with gender at least two, in particular at least four.
  • the lever arrangement (the fifth part) has a section which, seen in the longitudinal direction of the structural body, extends in the direction from the movable leg beyond the bending points assigned to the fixed leg and, seen in the transverse direction, between the in Transverse direction outer ends of these bending points runs, in particular as a penetrating section.
  • the lever arrangement does not extend over these bending points in the longitudinal direction, and in particular a scanning including a magnet-coil arrangement is located between the bending points of the movable and fixed leg.
  • bending points are provided between the fixed leg and the upper link, the fixed leg and the lower link, the movable leg and the upper link and the movable leg and the lower link.
  • the flexures do not extend continuously from one transverse end to the other, but discontinuously.
  • one, several or all of the bending points are divided into at least two, in particular exactly two, separate transverse sections. In this way, a satisfactory stiffening is achieved, especially in the direction of the load.
  • a further preferred configuration has a structural body in which, viewed in a projection onto a plane orthogonal to the load direction, a section of the lever arrangement that is particularly predominant as seen in the longitudinal direction lies between material regions of the first part, in particular with a ratio of the transverse extent of the lever arrangement section measured in this plane to the transverse extent of the first part of less than 0.9, preferably less than 0.8, in particular less than 0.7 over a longitudinal section of at least 40%, preferably at least 60%, in particular at least 80%, even at least 90% of the longitudinal extent of the handlebars.
  • the absolute dimensions of the longitudinal extension of the links which in addition to the thickness of the bending points influences the restoring force of the parallelogram arrangement, are determined as a function of the standard load of the load cell for which the structural body is to be used.
  • a region of the lever arrangement is in particular crossed several times by sections of the fixed leg, in particular a penetrated region and/or a penetrating section.
  • a bearing of the lever arrangement is supported by at least two struts of the first part with different angles to the plane orthogonal to the load direction. This allows for a satisfactory rigidity in the rigid connection of the load bearing fulcrum. Similar supports can be provided for areas of the first part in which a mounting coupling of the fixed leg is arranged, such as a mounting hole.
  • a particularly preferred configuration has a structural body in which a force transducer of the second part, which absorbs the weight load, is arranged in a view in the longitudinal direction between the bending points assigned to the movable leg on the one hand and the fixed leg on the other hand, and in particular by at least two struts of the second part is supported at different angles to the plane orthogonal to the load direction, the struts being in particular components of a penetrating section and/or penetrated area.
  • a strut of the load cell support of larger angling can penetrate the lever of the structural body, and the area between the struts of different angling can be penetrated by the upper link.
  • an arrangement of the structural body in a weighing device that is favorable for various applications can be achieved with respect to its load shell, for example, which is to be connected to the load receptor.
  • a connection of the load receiver to a support frame of the movable leg runs above the upper link.
  • a support for a reference weight such as a weighing sensor internal reference weight is provided.
  • the load introduced via the force transducer and the load introduced via the support for the reference weight are introduced into the lever arrangement via the same coupler.
  • a holding unit holding the reference weight when not in use could be supported on the fixed leg, for example via a fastening mechanism, in particular coupled to mounting bores which are provided, for example, on outriggers of the fixed leg.
  • the bending points already mentioned above which can have transverse sections spaced apart from one another when viewed in the transverse direction, define corner regions in space through their respective outer end in the transverse direction, which or their convex shell encloses a spatial region of a defined volume (the convex shell is formed by these outer ends of the respective upper and lower bending points being connected to one another and assigned to one another the right way round).
  • the product of this volume with the density of the material of the structural body is greater by a factor of at least 1.2, preferably at least 1.4, in particular at least 1.75 than the mass of the substance in this volume Material of the structure body.
  • This factor can also be two or more, in particular 2.5 or more, even 3 or more, also 4 or more.
  • the invention thus also provides a structural body having the features of the preamble of claim 1, in which the convex hull of the transversely outer ends of the bend points comprises a volume whose product is multiplied by the density of the material of the structural body by a factor of at least 1.2 , preferably at least 1.4, in particular at least 1.75, is greater than the mass of the material of the structural body located in this volume.
  • This factor can also be two or more, in particular 2.5 or more.
  • the maximum extent of the movable leg in the transverse direction is less than that of the fixed leg by a factor of at least 1.125, preferably at least 1.25, in particular at least 1.5.
  • the transverse extension of the link tapers in the direction of the movable leg with an inclination of 6% or more, preferably 12% or more, in particular 18% or more. This variant is particularly suitable for applications with lower loads.
  • the maximum extension of the movable leg in the transverse direction may be less than that of the fixed leg by a maximum of a factor of 1.33, preferably at most 1.25, in particular at most 1.125, and may also be greater than the fixed leg, however, preferably no more than the latter factors. In this variant, more relative importance is given to the diagonal pull of the handlebars than to the mass of the movable leg.
  • the transverse extent of the links can taper in the direction of the movable leg with an inclination of 6% or more, preferably 12% or more, in particular 18% or more, or run evenly or with an inclination of no more than 18%. , preferably as 12%, in particular as 6% or more taper and / or expand.
  • the invention also provides a set of two or more, preferably 3 or more structural bodies according to claim 1 with different transverse extents of the movable leg.
  • the distance between the upper link and the lower link in the load direction is less than the transverse extent of the bending points between the upper link and the fixed leg, in particular by a factor of more than 1.2 , preferably more than 1.4, in particular more than 1.6 smaller.
  • this distance is equal to or greater than the transverse extent of the bending points between the upper link and the fixed leg and/or movable leg, in particular by a factor of more than 1.1, even more than 1.2, even more than 1.3 larger.
  • first to sixth parts are connected to one another in one piece, with the components themselves and their connection preferably being produced in the additive process.
  • a coil holder which is attached to the lever of the structural body is also preferred is integrally formed in one piece with the additive process. Accordingly, the coil holder is preferably not a separate component that would have to be mechanically connected to the lever.
  • the invention also relates to the production of a structural body according to one of the aforementioned aspects using an additive method such as a 3D printing method.
  • the specific molding technique is not limited to certain techniques that are known per se in this regard, for example strand deposition processes, powder bed processes, selective laser melting (SLM), electron beam melting, ADAM processes, LCM processes, and also modified powder bed processes (hypoid with intermediate milling processing ) are used. It is also being considered to use different materials, e.g. for the bending points, e.g. by applying a different powder in the powder bed process at predefined points.
  • plastic materials such as metallic materials can be used.
  • a material based on an aluminum compound could be used, such as AISilOMg.
  • the iron content of the material is no more than 0.1% by weight, preferably no more than 0.08% by weight, more preferably no more than 0.06% by weight, in particular no more than is 0.05% by weight. This ensures lower interference effects of the electromagnetic force compensation, especially when the coil holder itself is part of the additively manufactured system.
  • This type of production is also considered by the invention to be advantageous even for designs according to the preamble of claim 1, in which the individual functional parts are not penetrated by other functional parts in the sense of penetrating the hole of an area of the topology of a handle body, and thus independently and autonomously discloses the production of a structural body according to the preamble of claim 1 in the additive process (3D printing) and a structural body of a weighing sensor produced in this way.
  • the bending points of the Roberval mechanism are post-processed after the additive method in a material-reducing machining step and thereby brought into their final shape.
  • temporary connecting struts can be created in the additive process, which are later removed again to reduce material and are therefore not part of the are completed structural body. The latter can take place in particular after the post-processing step for the bending points.
  • the coupling between the movable leg and the lever arrangement (or the lever in the case of only one lever to the lever coupling) is reworked, and/or the bearing for the lever, particularly in the area near this coupling, is reworked in a material-reducing machining step.
  • individual fixed points such as bearings for the levers, bending points, attachment points of the fixed leg can be defined in one step, in a further step force flow paths between individual fixed points can be determined and variations of the same can be compared with one another, and in the case of a a desired force flow path arrangement crossing of two force flow paths or support structures of individual functional components, a design can be selected from the topology of a handle body for an area whose hole in the crossing area is penetrated by another part from the first to sixth, in order to avoid a space occupied by a functional part to make it accessible to the other functional part alone. In this way, a bionic structure with favorable power transmission in the structure can be realized in a comparatively still small installation space.
  • the structural body has at least one receptacle, which extends predominantly, preferably entirely, in the transverse direction for the temporary connection coupling of at least two of the first, second and fifth part (fixed leg, movable arm and lever arrangement), mediated by a temporarily in the receptacle insertable security element.
  • the components forming the receptacle have surface areas which are aligned with one another when viewed in a projection onto the transverse direction and in which the boundary of the receptacle is defined. Two or more such receptacles can also be provided.
  • a receptacle for receiving a fuse element is provided extending over the fixed part, the movable part and the lever.
  • the receptacles can be formed as through openings through the surface areas or as indentations that are not completely enclosed, so that the movement of the parts relative to one another is restricted.
  • a method for producing a structural body of a weighing sensor with the features of the preamble of claim 1 is disclosed independently as being worthy of protection, in which the first to sixth parts are formed in one piece in the additive process and in the additive method, at least one receptacle that extends predominantly and preferably essentially in the transverse direction is created for the temporary coupling of at least two of the first, second and fifth part of the structural body, which restricts mobility, which can be effected by means of a securing element introduced into the receptacle, the method being preferred comprises the work steps downstream of the additive manufacturing process of introducing a security element into the receptacle and removing the security element from the receptacle again, and wherein at least one material-reducing processing ns the coupling and/or a removal of a material bridge that connects parts and is produced in an additive process preferably takes place during the temporary securing effected by the insertion of the securing element.
  • the security element could be a security bolt, for example; if necessary, the receptacle would still have to be reworked by machining, for example by drilling/milling, if the alignment was not perfect in order to insert the security element.
  • An eroding process can be used to detach the structural body after the additive manufacturing process.
  • an end region of the fixed leg that is axial in the longitudinal direction forms a flat surface that extends in the transverse direction and in the load direction, which can be used as a mounting surface and/or can be formed by such erosion.
  • the invention also relates to a weighing sensor, preferably based on the principle of electromagnetic force compensation, which has a structural body designed according to one of the aforementioned aspects.
  • a calibrating weight, a calibrating lifting device, a magnet system, a coil, a scanning device and an electronic circuit are considered as add-on parts that can be attached in particular to intended attachment points of the structural body.
  • Also covered by the invention are weighing devices with one or more such weighing sensors.
  • the principle of electromagnetic force compensation is well known to a person skilled in the art and is therefore not described in any more detail here, but instead reference is made to e.g. EP 1 726 926 B1, in particular [0008].
  • Such a weighing sensor is preferably designed for the low-load range, for weighing weights of no more than 1000 g, preferably no more than 800 g, more preferably no more than 600 g and in particular no more than 500 g.
  • the lever arrangement has only one lever.
  • an arrangement for applying a reference weight is preferably also provided, which is connected to the movable leg and is also formed in one piece with the movable leg using the additive method.
  • Fig. 1 shows a perspective view of a structural body for a weighing sensor
  • Fig. 2 shows another perspective view from a different angle
  • Fig. 3 shows the structural body in a side view
  • Fig. 4 shows the structural body in a plan view in the load direction
  • Fig. 5 shows the structural body in a rear (longitudinal) plan view
  • FIG. 6 shows a detail from FIG. 1 with additions to the weighing sensor
  • Figure 7 is a partially sectioned view of a portion of another structural body near the movable leg
  • Fig. 8 shows a perspective view of an end portion to the movable leg of this other structural body
  • Fig. 9 shows the other structural body in a slightly perspective view compared to a pure side view.
  • a structural body 100 is shown, the load direction g is in this view from top to bottom, the longitudinal direction is essentially the diagonal from top left to bottom right, and the transverse direction is the other diagonal.
  • the upper link 30 of the Roberval mechanism of the structural body 100 is not solid, but constructed from a plurality of interconnected struts.
  • the bending point between the upper link 30 and the fixed leg 10 is split in the transverse direction into the two separate transverse sections 130R, 130L, as is the bending point between the upper link 30 and the movable leg 20.
  • a longitudinal strut 31 of the upper link 30 connects each in the transverse direction Q mutually associated transverse sections 130R, 230R, or 130L, 230L of the bending points between the upper link 30 and fixed leg 10 and movable leg 20.
  • Diagonal struts 32 connect the diagonally opposite transverse sections 130R, 230L or 130L, 230R. At the level of the intersection of the diagonal struts 33 are still arranged between the diagonal struts 32 and the longitudinal struts 31 .
  • the upper link 30 tapers from the side of the fixed leg 10 to the movable leg 20 .
  • the transverse extent of the bending point 230 is less than the transverse extent of the bending point 130 by a factor of approximately 2.75. This narrowing can be seen again clearly in FIG from the movable leg 20 towards the fixed leg 10 is.
  • the inclination of the longitudinal struts 31 to the longitudinal direction is approximately 18.5°.
  • the lower link 40 is of the same construction as the upper link 30 with longitudinal struts 41, diagonal struts 42 and transverse struts 43, and connects between the bending point transverse sections 140L, 140R towards the fixed leg 10 and 240L, 240R towards the movable leg 20 .
  • the movable leg 20 has a support frame lying essentially in the plane spanned by the load direction g and the transverse direction Q, with an upper cross brace 23, at the lateral ends of which vertical braces 24 extend in the load direction, and with two diagonal braces 22 forming a supporting cross (see Fig Figure 5) on.
  • a load sensor 28 is provided with a bore 29 , in the example shown in the shape of a circular disk, which is connected to the cross brace 23 via a linkage 27 .
  • the linkage 27 has two longitudinal struts anchored to the crossbar 23
  • the load receiver 28 and linkage 27 are connected.
  • the load receiver 28 and linkage 27 are located above the upper link 30.
  • the load receiver 28 is supported by two more massive support struts 26, which are fixed to a lower area of the vertical supports 24.
  • the direction in which the support struts 26 extend contains directional components both in the load direction g, in the longitudinal direction L and in the transverse direction Q, and these are therefore referred to as spatial diagonal supports 26 .
  • the spatial diagonal supports 26 run orthogonally to the transverse direction in projection onto the plane (in Fig.
  • the transverse direction is the normal to the plane of the paper) at an angle of approximately 23° to the longitudinal direction L in the example shown
  • the two spatial diagonal supports 26 are connected by diagonal struts 262 forming a support cross (see FIG. 5).
  • the load receiver 28 is rigidly connected to the carrier frame 23 , 24 , 22 via the space diagonal supports 26 and the linkage 27 .
  • a diagonal strut 32 of the upper link 30 penetrates an opening defined by a spatial diagonal strut 26, the load receiver 28, a longitudinal strut 271, the transverse strut 23 and a vertical strut.
  • the position of the bending point transverse sections to the upper link 30 is approximately at the level of the intersection of the vertical supports 24 and the transverse support 23 of the movable leg 20, the position of the bending point transverse sections to the lower link 40 via a bent extension of the vertical support 24, the ends of which are connected by another (lower) crossbar 25.
  • the bending points 130, 140, 230, 240 do not yet appear as thin points; their formation, starting from the structural body shown, still takes place in a material-reducing processing step.
  • the connection to the coupling 60 runs, which couples the movable leg 20 to the lever 50 of the lever arrangement, which in this embodiment consists of only one lever.
  • the extent of the belt 60 in the longitudinal direction can be seen clearly in FIG. 3; in a direction Q, the width of the belt 60 is again considerably reduced, see FIG. 5.
  • the lever 50 is designed as a two-armed lever, to whose short arm 51 directed towards the movable leg 20 the coupler 60 is coupled from below, and with a long lever arm 54, on whose far end region there is a coupler 56 for the electromagnetic force compensation (Fig. 6) of the weighing sensor.
  • the free end 58 serves to determine the position of the position sensor (FIG. 6) as is customary in the prior art.
  • the invention is not limited to lever arrangements with only one lever.
  • a multiple lever system could also be formed, in particular with two or three levers; the use of space according to the invention is also advantageous here.
  • the bearing of the lever on the fixed leg 10 is split at a left-hand bearing point 150L and a right-hand bearing point 150R (the L and R for “left” and “right “ is based on the representation of Fig. 1 and is therefore not consistent with the representation of Fig. 5 with regard to the left and right direction there).
  • the bearing points 150R, 150L are arranged very close to the support frame 23, 24, 22, 25, measured from the bending points 130, 140 to the fixed leg 20, the bearing 150 is approximately at a distance of over 90% of the extension of the links 30, 40 in the longitudinal direction L.
  • the short lever arm 51 of the lever 50 has a transverse reinforcement 152 extending between the bearings 150L and 150R and is essentially formed from it, which in this exemplary embodiment is essentially triangular in projection orthogonal to the load direction g, with the coupler 60 at the free end, for example at the apex of the triangle with an obtuse angle.
  • the long lever arm 54 consists of two longitudinal struts 55 over a large part of its longitudinal extension, which converge near the coupling 56 and widen in the direction of the bearing points 150L, 150R that are separate in the transverse direction and fan out again near these bearing points.
  • the integral with the The free end of the long arm 54 formed by the entire lever 50 extends, viewed in the longitudinal direction, beyond the bending points 130, 140 and in the process penetrates a vertical support frame 11 of the fixed leg 10.
  • the fixed leg 10 has a vertical frame 11 extending essentially in the plane orthogonal to the longitudinal direction and a horizontal frame 12 extending in the direction of the movable leg 20 essentially in a plane orthogonal to the load direction (FIG. 3).
  • the vertical frame has two transverse struts 113 and two vertical struts 114, near whose respective connections the bending points 130, 140 are arranged.
  • An opening defined by the upper cross brace 113 and the diagonal brace 32 of the upper link 30 is penetrated by the spatial diagonal supports 26 of the movable leg 30 .
  • the horizontal frame 12 has, as can best be seen from a combination of FIGS. 3 and 4, two essentially parallel longitudinal struts 121, near the far end area of which a transverse strut 123 is provided.
  • each of these struts 121, 121 and 123 is provided with a mounting hole 129, via which the structural body can be fastened to the weighing device.
  • a cross brace 128 connecting the longitudinal struts 121 is attached.
  • Mounting holes 125 are provided on outriggers 124 of the horizontal frame, via which an arrangement for applying a reference weight can be attached.
  • the reference weight (not shown) can be placed on a support 21 which is rigidly connected to the vertical supports 24 of the movable leg 20 via a linkage 214 .
  • both the load of a weight to be measured applied to the load receptor 28 and the load of a reference weight applied to the support 21 are forwarded via the same coupler 60 between the movable leg 20 and the lever 50.
  • the longitudinal struts 121 of the horizontal frame are flanked on both sides by a lower longitudinal strut 14 and an upper longitudinal strut 13, which is connected to the respective longitudinal strut 121 via diagonal struts 15 seen in relation to the plane orthogonal to the transverse direction.
  • the transverse struts 13 are connected to one another and to the transverse strut 113 of the vertical frame via further struts forming a support triangle 16 .
  • a diagonal strut 17 connects the cross strut 113 to the horizontal frame 12 via the support cross 128.
  • the Diagonal support 17 penetrates the opening defined by the longitudinal struts 55 and transverse reinforcement 152 of the lever 50, so that the lever 50 and the fixed leg 10 penetrate each other.
  • the assembly area with the assembly hole 129 of the cross brace 123 is also connected to the cross brace 128 and the longitudinal braces 121 via a cross brace running in the longitudinal and cross direction. It can be seen that the mounting areas are supported multiple times by struts, as are the bearing points 150R, 150L.
  • the longitudinal struts 13, 121 and 14 are thus, as can be seen particularly well in FIG. 4, seen in the transverse direction with respect to the centrally arranged lever 50 further to the outside than the lever 50.
  • All the components 10, 20, 30, 40, 50 and 60 shown in FIGS. 1 to 5 have been produced together in one piece in this exemplary embodiment by way of the additive manufacturing process.
  • the final shape of the thin bending points at the bending points between the levers and the legs of the Roberval mechanism are produced by material-removing processing starting from the material area formed additively there.
  • a completely additive manufacturing is also provided in a different design.
  • Plastic materials as well as metallic materials can be considered as material for the structural body 100 . All parts can be made of the same material, but the use of different materials is also contemplated, for example forming the bending points from a different material than the other areas
  • Structural body 100' has also been produced using the additive method, in this exemplary embodiment from a 3D-printable powder, in this example approximately AISilOMg with an iron content of less than 0.05% by weight.
  • the structural body 100' is also constructed according to the principle of the Roberval mechanism, with a fixed leg 10', a movable leg 20', and an upper link 30' and a lower link 40' (for the second embodiment, the same components are used for the same Reference numbers used, but as primed reference numbers).
  • the load receiver 28' is not only connected via a linkage 27' approximately parallel to the upper link 30' to an axial end region of the movable leg 20', but also viewed orthogonally to the transverse direction Q in the plane sloping diagonal struts, which are connected to the area of the movable leg that is located further down, viewed in the direction of the load, and in the process penetrate penetrated areas of the lever 50'.
  • the upper link 30′ has two struts 32′, 33′ on the right and left side, which extend essentially in the longitudinal direction with a diagonal component, the struts 32′ from the right and left side in the area of penetration of the movable leg 20' are connected to each other.
  • the coil-side end of the lever 50' does not protrude beyond the frame structure 114' of the fixed leg 10'.
  • the frame structure 114′ can be formed as a flat contact surface on the axial end side, viewed in the longitudinal direction.
  • the structural body can be detached from the apparatus after it has been produced, for example by eroding.
  • the coil holder 56′ and the free lever end 58′ provided for sensor coupling are an integral part of the structural body 100′ produced additively and not an additional component coupled to it only after the structural body 100′ has been produced.
  • connections between the links 30 'and 40' with the fixed and movable leg 10 ', 20' are formed by thin areas in the sense of a thin material bridge as in the first embodiment (see 130R ', 140L' in Fig. 9) . These can exist in their final configuration through mechanical reworking, or can already be generated in the additive process to the final geometry.
  • moving parts are preferably temporarily secured against one another.
  • This can be done in that the locking pin receptacles Q1, Q2 and Q3, which can be seen in FIG. 9, are still formed in the additive process in material areas of the parts to be secured against one another for receiving screw pins (not shown).
  • the fixed leg 10', the movable leg 20' and/or the lever 50' have overlapping surface areas seen in projection orthogonally to the transverse direction, through which the securing pin receptacles Q1, Q2, Q3 run.
  • Q1 runs through areas of the fixed leg 10' and the movable leg 20' in the vicinity of the bearing points 150' (crossing the paddock in a central area).
  • a safety pin guided through Q1 can protect the belt when processing the bearing points (top and bottom) and when separating material webs.
  • Q2 runs both through areas of the fixed leg 10' and through areas of the lever 50' and also through the oblique connection of the movable leg 20' to the load receiver 28', which has already been explained above.
  • This configuration is also designed for the low-load range, for loads of preferably less than 1000 g, in particular less than 500 g.
  • loads preferably less than 1000 g, in particular less than 500 g.
  • the one with only one lever 50' is preferred in this embodiment as well.
  • material webs see, for example, 154′ in FIG. 8 to be formed in the additive manufacturing process, which in particular connect the lever 50′ to other components, such as the fixed leg 10′ or the upper link 30′. connect and only afterwards be removed, e.g. if the fuse has been established via the securing pin receptacles Q1, Q2, Q3.
  • the following steps can thus be carried out, for example: (1) attaching the securing pins, (2) post-processing the bearing points and/or couplers by machining, for example, and removing the material webs, ( 3) further assembling a load cell module with the structural body as the basic component, by adding one or more of the components coil, position sensor, PCB/S, load application interface, power supply, wiring, etc., (4) removing the locking pins before putting into operation.
  • the structural body 100 Due to its design with numerous longitudinal, transverse and vertical struts as well as diagonal struts, the structural body 100 is constructed with a comparatively low mass in relation to the overall extent of the structural body but nevertheless high rigidity and allows an extended possibility of use due to the interpenetration of different functional components local installation space areas, which allows the positioning of components of the individual functional parts to be more variable and allows favorable designs for controlling the flow of the power paths.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Measurement Of Force In General (AREA)

Abstract

L'invention concerne un corps structural d'un capteur de pesée pourvu d'un mécanisme Roberval, présentant une première partie comprenant la branche fixe du mécanisme Roberval, une deuxième partie comprenant la branche mobile du mécanisme Roberval, une troisième partie comprenant le bras supérieur du mécanisme Roberval, une quatrième partie comprenant le bras inférieur du mécanisme Roberval, une cinquième partie comprenant un ensemble levier reliant la branche mobile à un côté de sortie servant à la mesure sensorielle et une sixième partie comprenant une bielle qui accouple la branche mobile à l'ensemble levier. Selon l'invention, au moins une des parties de la première à la cinquième partie présente une zone ayant la topologie d'un corps en anses au moins de genre 1, dont le ou les trous sont traversés par au moins une section d'une autre partie de la première à la sixième partie, laquelle section est reliée d'un seul tenant à ladite zone.
EP21831254.4A 2020-12-04 2021-12-03 Corps structural d'un capteur de pesée Pending EP4256285A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20212019.2A EP4009013B1 (fr) 2020-12-04 2020-12-04 Corps structural d'un capteur de pesage
PCT/EP2021/084135 WO2022117801A1 (fr) 2020-12-04 2021-12-03 Corps structural d'un capteur de pesée

Publications (1)

Publication Number Publication Date
EP4256285A1 true EP4256285A1 (fr) 2023-10-11

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EP20212019.2A Active EP4009013B1 (fr) 2020-12-04 2020-12-04 Corps structural d'un capteur de pesage
EP21831254.4A Pending EP4256285A1 (fr) 2020-12-04 2021-12-03 Corps structural d'un capteur de pesée

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EP20212019.2A Active EP4009013B1 (fr) 2020-12-04 2020-12-04 Corps structural d'un capteur de pesage

Country Status (6)

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US (1) US20240027256A1 (fr)
EP (2) EP4009013B1 (fr)
JP (1) JP7822379B2 (fr)
CN (1) CN116981915A (fr)
PL (1) PL4009013T3 (fr)
WO (1) WO2022117801A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4063806B1 (fr) * 2021-03-25 2026-03-04 Mettler-Toledo GmbH Corps de capteur monobloc et son procédé de fabrication
WO2025176270A1 (fr) * 2024-02-20 2025-08-28 Kk Wind Solutions A/S Réceptacle de tour

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119734A1 (de) 1991-06-14 1992-12-17 Mettler Toledo Ag Vorrichtung zur kraftuntersetzung in einer kraftmesseinrichtung, insbesondere einer waage
DE19605087C2 (de) 1996-02-12 1998-05-20 Mettler Toledo Gmbh Kalibriervorrichtung für eine Waage
JP3570373B2 (ja) 2000-11-14 2004-09-29 株式会社島津製作所 電子天びん
PL1726926T3 (pl) 2005-05-26 2017-08-31 Mettler-Toledo Gmbh Prowadnica równoległa do kompaktowych systemów wagowych
WO2010092663A1 (fr) 2009-02-10 2010-08-19 株式会社島津製作所 Corps de mécanisme de capteur et balance électronique l'utilisant
DE102019113001A1 (de) 2019-05-16 2020-11-19 Wipotec Gmbh Monolithischer Wägeblock

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JP7822379B2 (ja) 2026-03-02
EP4009013A1 (fr) 2022-06-08
WO2022117801A1 (fr) 2022-06-09
EP4009013B1 (fr) 2025-04-16
PL4009013T3 (pl) 2025-07-21
CN116981915A (zh) 2023-10-31
JP2023551699A (ja) 2023-12-12
US20240027256A1 (en) 2024-01-25

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