STRUCTURAL BODY OF A WEIGHT SENSOR

Description

[0001] The invention relates to a structural body of a weighing sensor with a Roberval mechanism, in particular for a weighing sensor according to the electromagnetic force compensation principle, and a method for its production.

[0002] In particular, the invention relates to a structural body of a weighing sensor with Roberval mechanism according to independent claim 1.

[0003] 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 compactly as possible so that they require as little space as possible in a weighing device using the weighing sensor. This makes them particularly suitable for applications in which the weighing device comprises a plurality of such weighing sensors. Furthermore, it is understood that the weighing sensors should also have the highest possible weighing accuracy.

[0004] With regard to these requirements, structural bodies in the form of a so-called monoblock have been developed in the prior art and have essentially prevailed in this form, as disclosed, for example, in DE 196 05 087 A1 or EP 2 397 824 A1. Such structural bodies are manufactured by starting from a cuboid block of material with, 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 regions in the longitudinal direction belong, on the one hand, to the fixed leg and, on the other, to the movable leg of the Roberval mechanism.By removing material from this monoblock in the form of perforations or cutting lines by piercing the block in the transverse direction, the monoblock is given a structure such that the links are defined at the top and bottom and the interior area enclosed by the legs and these links of the Roberval mechanism running at the top and bottom is divided into different functional areas, namely, on the one hand, areas belonging to the fixed leg and, on the other hand, a lever arrangement with usually one, two or three levers is formed, which are mounted on the fixed leg via corresponding bearings and are connected to the movable leg or, if necessary, between the levers by so-called couplings. The separation between the levers and the material belonging to the fixed leg lies in essentially only thin dividing lines (the advantages of which, for example,in DE 41 19 734 A1), since, due to the measuring principle based on electromagnetic force compensation, a significant movement of the levers exceeding the dimension of the dividing line does not occur anyway. The last lever in the force transmission path typically has two transverse bores, over which a lever extension is mounted. At the free end of the lever extension, 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.

[0005] The technology of this minimal material removal by transverse perforation, for example by wire erosion, is now so sophisticated that even the incorporation of a sub-Roberval mechanism for coupling the weight load of an internal reference weight can be incorporated into the monoblock, even with material weakening in the transverse direction, as disclosed, for example, in EP 2 397 824 A1.

[0006] Further prior art is provided by the patent specification DE 10 2019 113001 A1.

[0007] The invention is based on the object of further developing a structural body of the type mentioned at the outset in the direction of a satisfactory combination of the smallest possible installation space and the highest possible weighing accuracy.

[0008] This object is achieved by the invention in terms of device technology by a development of the structural body of the type mentioned at the outset, which is essentially characterized in that at least one of the first to fifth parts has a region of the topology of a handle body of at least one gender, the at least one hole of which is penetrated by at least one section of another of the first to sixth parts that is integrally connected to this region.

[0009] Due to the development according to the invention, at least one area of ​​the installation space occupied by the structural body, which is conventionally 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 extension directions can be created while saving material. Thus, by designing the area in the topology of a handle body, the space formed by the hole in the handle body is used, for example, 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.For example, the load receiver of the movable leg can be positioned more variably while still being supported in a favorable manner by guiding support struts through areas of the fixed leg 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 provides greater flexibility in positioning the load receiver and enables more reliable support and an improved force transmission path of the structural body. The last lever of the lever arrangement can, for example, be guided through a previously inaccessible area of ​​the fixed leg, thus simplifying the lever arrangement and even coupling it to the electromagnetic force compensation.

[0010] By designing areas of the functional parts in the topology of a handle body, particularly of gender two or more, an overall weight reduction is achieved while maintaining the same rigidity and thus reducing the dimensions of the structural body, so that, based on the same weight of the structural body, greater compactness and / or lower material requirements are achieved. For example, areas of the fixed leg in a structure consisting of a plurality of struts can be formed from a plurality of longitudinal struts with a predominantly longitudinal extension, a plurality of vertical struts with a number running predominantly in the load direction, and a plurality of transverse struts with a predominantly transverse extension, instead of solid areas.Due to the one-piece connection between the area of ​​the topology of a handle body and the section penetrating it, e.g., of another functional part, the one-piece nature of the connection also ensures that no additional space is required for mechanical connections or adapters for linking two non-integrally connected areas. In this respect, the invention further benefits from the monoblock technology explained above.

[0011] An example of the topology of a handle body of genus one is known to be a torus (doughnut), whereby due to the topological property of the handle body, the shape of the edge of the "hole" (or the multiple holes) is not important; for example, a closed frame also represents an example of a handle body of at least genus one. In a preferred variant, 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.

[0012] The design comprising a large number of individual, integrally connected struts is disclosed by the invention as being advantageous in its own right, even regardless of any mutual penetrations. Thus, the invention also provides a structural body according to the preamble of claim 1, which has at least 12, even 16, in particular 24 longitudinal struts, at least 4, even 2 vertical struts, and at least 4, even 8 transverse struts as defined above. At least 8, in particular at least 16 of these can preferably be provided as diagonal struts, i.e., with an extension in one direction that is orders of magnitude smaller than the extension in both other directions.

[0013] In one possible embodiment, functional parts can also be intertwined; for example, the penetrating section can be part of a region intertwined with the penetrated region, also having the topology of a handle body of at least one gender. This enables good use of the available installation space while maintaining satisfactory rigidity of the respective functional sub-regions. A configuration can also be provided in which a hole in such a region of a functional part is penetrated by a penetrating section of the same functional part.Furthermore, designs are also contemplated in which components of two different functional parts together form an area with the topology of a handle body of at least one gender, which is penetrated by a penetrating section of one of these functional parts or by yet another functional part. For example, a section of the movable leg could penetrate a frame structure formed by the upper link and the fixed leg.

[0014] In another possible embodiment, the handle body's gender of the penetrated region can be two or more, and at least one further hole can be penetrated by the other part and / or by yet another part of the first to sixth parts that is integrally connected to the penetrated region. It is also contemplated that each hole in the handle body can be penetrated by a section of a different part.

[0015] It can also be provided that, in addition to the one part, at least one further part from the first to fifth parts has a region with the topology of a handle body of at least one gender, whose at least one hole is penetrated by at least one other part from the first to sixth parts that is integrally connected to this region of the further part (and opposite this further part). In this regard, multiple penetrations can also be provided, and the above-explained shared partial use of a local spatial area can be realized multiple times at different locations.

[0016] Variants are also conceivable in which some functional parts have penetrated regions and others do not. Preferably, the first part has such a penetrated region of the topology of a handle body of at least gender one. More preferably, the fifth part has such a penetrated region of the topology of a handle body of at least gender one. In a further preferred embodiment, the second part also has such a penetrated region of the topology of a handle body of at least gender one. Likewise, it can preferably be provided that the third part also has a penetrated region of the topology of a handle body of at least gender one.

[0017] Furthermore, it can be provided that one or more of the first to fifth parts have an area with the topology of a handle body of gender significantly higher than one, the holes of which are partially or even predominantly not penetrated. Thus, the first part preferably has an area with 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, or even at least gender twenty-four. The second part preferably has an area with the topology of a handle body of at least gender two, preferably at least gender four, in particular at least gender eight. The third and / or the fourth part preferably have an area with the topology of a handle body with gender at least two, in particular at least four.

[0018] In a further preferred embodiment, the lever arrangement (the fifth part) has a section that, viewed in the longitudinal direction of the structural body, extends from the movable leg beyond the bending points assigned to the fixed leg and, viewed in the transverse direction, runs between the outer ends of these bending points, in particular as a penetrating section. In an alternative embodiment, however, it can also be provided that the lever arrangement does not extend beyond these bending points in the longitudinal direction, and in particular that a scanning device including a magnetic coil arrangement is located between the bending points of the movable and fixed legs.

[0019] As is common with Roberval mechanisms, bending points (thin 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. In a preferred design, the bending points do not extend continuously from one end to the other in the transverse direction, but rather discontinuously. In a particularly preferred design, one, several, or all bending points are divided into at least two, in particular exactly two, separate transverse sections. In this way, satisfactory stiffening is achieved, particularly also in the load direction.

[0020] A further preferred embodiment has a structural body in which, viewed in projection onto a plane orthogonal to the load direction, a particularly predominant section of the lever arrangement, viewed 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 to the transverse extent of the first part, measured in this plane, 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 links. The absolute dimensions of the longitudinal extent of the links, which, in addition to the thickness of the bending points, influence 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.

[0021] In a further preferred embodiment, when projected onto a plane orthogonal to the transverse direction, a region of the lever arrangement is crossed, in particular, multiple times by sections of the fixed leg, in particular a penetrated region and / or by a penetrating section. By extending the fixed leg in the transverse direction beyond regions of the lever arrangement, at least in certain regions, increased rigidity can be achieved despite abandoning a solid structure in favor of integrally connected struts.

[0022] In a further preferred embodiment, a bearing of the lever arrangement is supported by at least two struts of the first part with different angular positions relative to the plane orthogonal to the load direction. This allows for satisfactory rigidity in the rigid connection of the force-absorbing lever support. Similar supports can be provided for areas of the first part in which a mounting connection of the fixed leg is located, such as a mounting hole.

[0023] According to the invention, it is provided that a force transducer of the second part, which absorbs the weight load to be absorbed, is arranged in a longitudinal direction between the bending points assigned to the movable leg on the one hand and to the fixed leg on the other hand, and is supported in particular by at least two struts of the second part with different angular positions to the plane orthogonal to the load direction, wherein struts are components of a penetrating section and penetrated region.

[0024] By arranging the load receptor more centrally in this way, a favorable arrangement of the structural body in a weighing device can be achieved for various applications with regard to, for example, the load tray, which is to be connected to the load receptor. In particular, it can be provided that a connection between the load receptor and a support frame of the movable arm runs above the upper link. With regard to the movable arm, it is also provided that a support for a reference weight, for example a reference weight internal to the weighing sensor, is provided. In particular, it is preferably provided that the load introduced via the force sensor and the load introduced via the support for the reference weight are introduced into the lever arrangement via the same coupling.A holding unit that holds 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 holes that are provided, for example, on the arms of the fixed leg.

[0025] The bending points already mentioned above, which can have transverse sections spaced from one another in the transverse direction, define corner regions in space through their respective outer ends in the transverse direction, which corner regions or their convex hulls enclose a spatial region of a defined volume (the convex hull is formed by connecting these outer ends of the respective upper and lower bending points to one another and with the correct sides). In a particularly preferred embodiment, it is provided that the product of this volume and the density of the material of the structural body is a factor of at least 1.2, preferably at least 1.4, in particular at least 1.75 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.

[0026] This aspect is also disclosed by the invention as being independently advantageous and independent of any penetrations of the functional parts. The invention thus also provides a structural body with the features of the preamble of claim 1, in which the convex hull of the transversely outer ends of the bending points comprises a volume whose product 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 material of the structural body located in this volume. This factor can also be two or more, in particular 2.5 or more.Due to the resulting material distribution, higher area moments of inertia and therefore higher bending moments are achieved with respect to the total material used for individual load directions, thus achieving a satisfactory stiffness of the functional components of the structural device while saving material.

[0027] In a preferred embodiment, the maximum extension of the movable leg in the transverse direction is at least a factor of 1.125, preferably at least 1.25, in particular at least 1.5 smaller than that of the fixed leg. Alternatively or additionally, the transverse extension of the links tapers towards the movable leg at an incline of 6% or more, preferably 12% or more, in particular 18% or more. This variant is particularly suitable for applications with lower loads. However, particularly for larger loads, it is preferred that the maximum extension of the movable leg in the transverse direction be at most a factor of 1.33, preferably at most 1.25, in particular at most 1.125 smaller than that of the fixed leg, and may also be greater than the fixed leg, but preferably not more than the latter factors.In this variant, the diagonal pull of the control arms is given greater relative importance than the mass of the movable leg. Alternatively or additionally, the transverse extension of the control arms can taper toward the movable leg at an incline of 6% or more, preferably 12% or more, in particular 18% or more, or can taper and / or widen at an incline of no more than 18%, preferably 12%, in particular 6% or more. In this context, the invention also provides a set of two or more, preferably three or more, structural bodies according to claim 1 with different transverse extensions of the movable leg.

[0028] In one possible embodiment, with a view to installation space, it can be provided that the distance between the upper link and the lower link in the load direction is smaller 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. However, variants are also conceivable in which 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 the movable leg, in particular by a factor of more than 1.1, even more than 1.2, or even more than 1.3.

[0029] In a particularly preferred embodiment, several, in particular all of the first to sixth parts are connected to one another in one piece, wherein the components themselves as well as their connection are preferably manufactured using an additive process.

[0030] Accordingly, the invention also relates to the production of a structural body according to one of the aforementioned aspects using an additive process, such as a 3D printing process. The specific molding technique is not limited to specific techniques known in this regard; for example, strand deposition processes, powder bed processes, ADAM processes, LCM processes, and even modified powder bed processes (hypoid with intermediate milling) can be used. It is also conceivable to use different materials, for example, for the bending points, by applying a different powder to predefined locations using the powder bed process.

[0031] This method 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 the penetration of 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 an additive process (3D printing) as well as a structural body of a weighing sensor produced in this way.

[0032] In a particularly preferred process configuration, the bending points of the Roberval mechanism are reworked in a material-removing processing step following the additive process, thereby bringing them into their final shape. Additionally or alternatively, temporary connecting struts can be created during the additive process, which are later removed again in a material-removing process and are therefore not part of the finished structural body. This can be done, in particular, after the reworking step for the bending points.

[0033] When designing the structure, individual fixed points such as bearings for the levers, bending points, and 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 these points compared. In the case of an intersection of two force flow paths or support structures of individual functional components resulting in a desired force flow path arrangement, a design based on the topology of a handle body can be selected for an area whose hole in the intersection area is penetrated by another of the first to sixth parts. This makes one installation space accessible to the other functional part, as opposed to one where the installation space is occupied solely by one functional part. In this way, a bionic structure with favorable force conduction within the structure can be realized even though the installation space is still comparatively small.

[0034] Furthermore, 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. Attachments that can be attached, in particular, to designated attachment points of the structural body include a calibration weight, a calibration lift, a magnet system, a coil, a sensing device, and an electronic circuit. Weighing devices with one or more such weighing sensors are also encompassed by the invention. The principle of electromagnetic force compensation is well known to those skilled in the art and will therefore not be described in further detail here. Instead, reference is made to, for example, EP 1 726 926 B1, in particular

[0008] .

[0035] Further features, details and advantages of the invention will become apparent from the following description with reference to the accompanying figures, of which 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 plan view from behind (in the longitudinal direction), and Fig. 6 shows a section of Fig. 1 with attachments of the weighing sensor.

[0036] In the perspective view of Fig. 1 a structural body 100 is shown, the load direction g in this illustration is 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.

[0037] The upper link 30 of the Roberval mechanism of the structural body 100 is not solid, but constructed from several interconnected struts. Furthermore, the bending point between the upper link 30 and the fixed leg 10 is split in the transverse direction into 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 the transverse sections 130R, 230R, and 130L, 230L, respectively, associated with each other in the transverse direction Q, to the bending points between the upper link 30 and the fixed leg 10 and the movable leg 20. Diagonal struts 32 connect the diagonally opposite transverse sections 130R, 230L, and 130L, 230R, respectively. At the level of the intersection of the diagonal struts, cross struts 33 are arranged between the diagonal struts 32 and the longitudinal struts 31.

[0038] By inclination relative to the longitudinal direction L, the upper link 30 tapers from the side of the fixed leg 10 to the movable leg 20. In the illustrated embodiment, the transverse extent of the bending point 230 is smaller by a factor of approximately 2.75 than the transverse extent of the bending point 130. This taper can be Fig. 5 It can be clearly seen again in which the normal to the paper plane is the viewing direction in the longitudinal direction from the movable leg 20 to the fixed leg 10. The inclination of the longitudinal struts 31 to the longitudinal direction is approximately 18.5° in this embodiment.

[0039] 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 cross sections 140L, 140R towards the fixed leg 10 and 240L, 240R towards the movable leg 20.

[0040] 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 strut 23, at the lateral ends of which vertical struts 24 extend in the load direction, as well as with two diagonal struts 22 forming a support cross (see Figure 5). To receive the load to be measured, a load receiver 28 is provided, which is provided with a bore 29 and, in the example shown, is circular disk-shaped and is connected to the cross member 23 via a rod assembly 27. In this exemplary embodiment, the rod assembly 27 has two longitudinal struts 271 anchored to the cross member 23, which are connected to one another by two diagonal struts 272 forming a support cross. In this embodiment, the load receiver 28 and rod assembly 27 are located above the upper link 30. In addition, the load receiver 28 is supported by two more massive support struts 26, which are attached to a lower region of the vertical supports 24. The extension direction of the support struts 26 contains directional components in the load direction g, the longitudinal direction L, and the transverse direction Q, and these are therefore referred to as spatial diagonal supports 26. As can be seen from Fig. 3As can be seen, the space diagonal supports 26 extend in projection onto the plane orthogonal to the transverse direction (in Fig. 3 the transverse direction is the normal to the paper plane) at an angle of approximately 23° to the longitudinal direction L in the example shown. The two spatial diagonal supports 26 are also connected by diagonal struts 262 forming a support cross (see Figure 5 ). The load receiver 28 is rigidly connected to the support frame 23, 24, 22 via the space diagonal supports 26 and the rod 27. An opening defined by a space diagonal support 26, the load receiver 28, a longitudinal strut 271, the transverse strut 23, and a vertical strut is penetrated by a diagonal strut 32 of the upper link 30.

[0041] In this embodiment, the position of the bending point cross sections to the upper link 30 is arranged approximately at the level of the intersection of the vertical supports 24 and the cross support 23 of the movable leg 20, while the position of the bending point cross sections to the lower link 40 is arranged via a bent extension of the vertical support 24, the ends of which are connected by a further (lower) crossbar 25. In the illustrated representation, the bending points 130, 140, 230, 240 do not yet appear as thin points; their formation, starting from the illustrated structural body, still takes place in a material-removing processing step.

[0042] The connection to the coupling 60, which couples the movable leg 20 to the lever 50 of the lever arrangement, which in this embodiment consists of only one lever, runs centrally in the transverse direction from the cross strut 25. The extension of the coupling 60 in the longitudinal direction is in Fig. 3clearly visible, in one direction Q the paddock 60 is again considerably reduced in width, see Fig. 5 .

[0043] The lever 50 is designed as a two-armed lever, to whose short arm 51 directed towards the movable leg 20 the coupling 60 is coupled from below, and with a long lever arm 54, at whose far end region a coupling 56 for the electromagnetic force compensation ( Fig. 6 ) of the weighing sensor. The free end 58 is used to determine the position of the position sensor ( Fig. 6 ) as is common in the prior art. However, 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; in this case, too, the inventive use of installation space is advantageous.

[0044] As can be seen from the Figures 1 and 5As can be clearly seen, the bearing of the lever on the fixed leg 10 is split in the transverse direction at a left bearing point 150L and a right bearing point 150R (the L and R for "left" and "right" are based on the illustration of Fig. 1 and is therefore not compatible with the representation of Fig. 5 regarding the left and right direction there). As can be seen particularly well Fig. 3 As can be seen, 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 located at a distance of approximately more than 90% of the extension of the control arms 30, 40 in the longitudinal direction L.

[0045] The short lever arm 51 of the lever 50 has a transverse stiffener 152 extending between the bearings 150L and 150R and is essentially formed therefrom, which in this embodiment is essentially triangular in projection orthogonal to the load direction g, wherein the coupling 60 is coupled at the free end, approximately at the apex of the triangle with an obtuse angle.

[0046] The long lever arm 54 consists, over a large part of its longitudinal extent, of two longitudinal struts 55, which converge near the coupling 56 and widen toward the transversely separate bearing points 150L, ​​150R, fanning out again near these bearing points. The free end of the long arm 54, formed integrally with the entire lever 50, extends longitudinally beyond the bending points 130, 140 and penetrates a vertical support frame 11 of the fixed leg 10.

[0047] Thus, the fixed leg 10 has a vertical frame 11 extending substantially in the plane orthogonal to the longitudinal direction and a horizontal frame 12 extending in the direction of the movable leg 20 substantially in a plane orthogonal to the load direction ( Fig. 3 ).

[0048] The vertical frame has two cross braces 113 and two vertical braces 114, near the respective connections of which 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 space diagonal supports 26 of the movable leg 30. The horizontal frame 12 has, as best seen from a summary of the Figures 3 and 4As can be seen, it has two essentially parallel longitudinal struts 121, near the distal end of which a transverse strut 123 is provided. In this exemplary embodiment, each of these struts 121, 121, and 123 is provided with a mounting hole 129 through which the structural body can be attached to the weighing device. A support cross 128 connecting the longitudinal struts 121 is located approximately at the height of the mounting holes 129.

[0049] Mounting holes 125 are provided on the outriggers 124 of the horizontal frame, through 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 rod 214. In this exemplary embodiment, both the load of a weight to be measured applied to the load receiver 28 and the load of a reference weight applied to support 21 are transmitted via the same coupling 60 between the movable leg 20 and the lever 50.

[0050] Viewed on both sides in the transverse direction Q, the longitudinal struts 121 of the horizontal frame are flanked by a lower longitudinal strut 14 and an upper longitudinal strut 13, which are connected to the respective longitudinal strut 121 via diagonal struts 15 viewed with respect 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. In addition, a diagonally running strut 17 connects the transverse 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 stiffener 152 of the lever 50, so that the lever 50 and the fixed leg 10 mutually penetrate each other. The mounting area with the mounting hole 129 of the cross strut 123 is also connected to the support cross 128 and the longitudinal struts 121 via a support cross running in the longitudinal and transverse directions.It can be seen that the mounting areas are supported multiple times by struts, as are the bearing points 150R, 150L.

[0051] The longitudinal struts 13, 121 and 14 are thus located as shown in particular Fig. 4 can be clearly seen, seen in the transverse direction with respect to the centrally arranged lever 50, further out than the lever 50.

[0052] On the side of the vertical frame 11 facing away from the movable leg 20, mounting holes 198 for the magnet-coil arrangement of the electromagnetic force compensation 70 with magnet and coil are provided via a rod 19, wherein the coil is fastened to the coil holder 56, as well as mounting holes 199 for the position sensor 80 cooperating with the free end 58 of the lever 50. This mounting state is in the cutout area of Fig. 6illustrated. It is understood that, in the case of a magnet-coil arrangement arranged on the other side of the vertical frame 11, corresponding mounting couplings would then be arranged on the side facing the movable leg 20.

[0053] All in the Figures 1 to 5The components 10, 20, 30, 40, 50, and 60 shown in this embodiment were produced together in a uniform, one-piece manner by means of the additive manufacturing process. As already mentioned, one design can provide for the final shape of the thin bending points at the bending points between the levers and the legs of the Roberval mechanism to be created by material-removing machining starting from the material area additively formed there. Alternatively, another design also provides for completely additive manufacturing. Both plastic and metallic materials can be considered as the 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.

[0054] The structural body 100 is constructed with numerous longitudinal, transverse and vertical struts as well as diagonal struts with a comparatively low mass in relation to the overall extent of the structural body but nevertheless high rigidity and allows an expanded use of local installation space areas due to the penetration of different functional components, which makes the positioning of components of the individual functional parts more variable and allows favorable designs for controlling the flow of the force paths. List of reference symbols

[0055] 10Fixed leg 11Vertical frame 12Horizontal frame 13Longitudinal strut 14Longitudinal strut 15Diagonal strut 16Support triangle 17Diagonal strut 19Linkage 20Movable leg 21Support reference weight 22Diagonal strut 23Cross strut 24Vertical strut 25Cross strut 26Space diagonal support 27Linkage 28Load receptor 29Bore ​​30Upper link 31Longitudinal strut 32Diagonal strut 33Cross strut 40Lower link 41Longitudinal strut 42Diagonal strut 43Cross strut 50Lever 51Short lever arm 54Long lever arm 56Spool holder 58Free lever end 60Coupling 70Electromagnetic force compensation 80Position sensor 100Structural body for weighing sensor 113Cross brace 114Vertical brace 121Longitudinal brace 123Cross brace 124Cantilever 125Mounting hole 128Support cross 129Mounting hole 130L, 130RBend point 140L, 140RBend point 150L, ​​150RBearing point 152Cross stiffener 198Mounting hole 199Mounting hole 214Rod 230L, 230RBend point 240L,240RBending point 262Diagonal strut 271Longitudinal strut 272Diagonal strut gLoad direction LLongitudinal direction QTransverse direction,

Claims

1. A structural body (100) of a scale sensor with Roberval mechanism (10, 20, 30, 40), comprising a first part with the fixed leg (10) of the Roberval mechanism, a second part with the movable leg (20) of the Roberval mechanism, a third part with the upper link (30) of the Roberval mechanism, a fourth part with the lower link (40) of the Roberval mechanism, a fifth part with a lever arrangement (50) connecting the movable leg (20) to an output side serving for sensory measurement, and a sixth part with a coupling (60) coupling the movable leg (20) to the lever arrangement (50), wherein at least one of the first to fifth parts has a region of the topology of a handle body of at least gender one, the at least one hole of which is penetrated by at least one portion of another of the first to sixth parts that is integrally connected to this region, a force receiver (28) of the second part that receives the weight load to be received is arranged in a longitudinal direction (L) between the bending points (230, 240; 130, 140) assigned to the movable leg (20) on one side and to the fixed leg (10) on the other side, characterized in that the force receiver (28) is supported by at least two struts (27; 26) of the second part with different angular positions relative to the plane orthogonal to the load direction (g), with struts (26) as components of such a penetrating portion and such a penetrated region.

2. The structural body according to claim 1, wherein the gender of the handle body of the penetrated region is two or more, and at least one further hole is penetrated at least in portions by the other part and / or a still other part of the first to sixth part integrally connected to the penetrated region.

3. The structural body according to any one of the preceding claims, in which, in addition to the one part, at least one further part of the first to fifth parts has a region with the topology of a handle body of at least gender one, the at least one hole of which is penetrated by at least one other of the first to sixth parts integrally connected to this region of the further part.

4. The structural body according to any one of the preceding claims, in which the lever arrangement (50) has a portion (54) which, viewed in the longitudinal direction (L) of the structural body (100), extends in the direction away from the movable leg (20) beyond the bending points (130; 140) assigned to the fixed leg and, viewed in the transverse direction (Q), runs between the transversely outer ends (130L, 130R; 140L, 140R) of these bending points, in particular as a penetrating portion.

5. The structural body according to any one of the preceding claims, in which, viewed in projection onto a plane orthogonal to the transverse direction (Q), a region (54) of the lever arrangement is intersected in particular several times by portions of the fixed leg, in particular a penetrated region and / or by a penetrating portion.

6. The structural body according to any one of the preceding claims, in which, viewed in projection onto a plane orthogonal to the load direction (g), a portion of the lever arrangement (51, 54) which is in particular predominant in the longitudinal direction (L) lies between material regions of the first part, in particular with a ratio of the transverse extent of the lever arrangement portion 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 portion of at least 40%, preferably at least 60%, in particular at least 80% of the longitudinal extent of the links (30, 40).

7. The structural body according to any one of the preceding claims, in which a support for a reference weight internal to the scale sensor is provided on the movable leg and in particular a load introduced via the force receiver (28) as well as a load introduced via the support for the reference weight is introduced into the lever arrangement (50) via the same coupling (60) and / or a support for a holding unit holding the reference weight when not in use is provided on the fixed leg (10).

8. The structural body according to any one of the preceding claims, in which the bending points (130, 140; 230, 240) have transverse portions (130L-130R; 140L-140R; 230L-230R; 240L-240R) spaced apart from one another in the transverse direction (Q) on the side of the fixed and / or movable leg for the upper (30) and / or lower (40) link.

9. The structural body according to any one of the preceding claims, in which the convex envelope of the bending point portions (130L, R; 140L, R; 230L, R; 240L, R) or the outer ends of the bending points in the transverse direction comprises a volume (v) the product of which with the density (p) of the material of the structural body (100) is greater by a factor of at least 1.2, preferably at least 1.4, in particular at least 1.75, than the mass (m) of the material of the structural body (100) located in this volume.

10. The structural body according to any one of the preceding claims, in which the maximum extension of the movable leg in the transverse direction is smaller than that of the fixed leg by at least a factor of 1.125, preferably at least 1.25, in particular at least 1.5.

11. The structural body according to any one of the preceding claims, in which multiple, in particular all of the first to sixth parts are integrally connected to one another, in particular by production using an additive method.

12. Production of a structural body designed according to any one of the preceding claims using an additive method.

13. Production according to claim 12, in which, following the additive method, the bending points of the Roberval mechanism are reworked in a material-removing processing step and / or wherein temporary connecting struts are created in the additive method, which struts are later removed again in a material-removing manner, the latter in particular after the reworking step for the bending points.

14. A scale sensor, in particular operating according to the principle of electromagnetic force compensation, with a structural body designed according to any one of claims 1-11.

15. A scale device with one or more scale sensors designed according to claim 14.