Adapter body for a force-measuring device, method for providing a force-measuring device comprising such an adapter body, and force-measuring device comprising such an adapter body

Abstract

The invention relates to an adapter body (AB) for a force-measuring device (SD) for measuring a force (F), said adapter body (AB) having a connection opening (21) for connecting a pressure sensor (PS). The adapter body (AB) has a force-introducing element (11) for introducing the force (F) to be measured, said force-introducing element (11) having a planar extent (11A), and the adapter body (AB) has an interior (22) for filling with a fluid (3), said interior (22) connecting the force-introducing element (11) to the connection opening (21).

Description

Adapter body for a force measuring device, method for providing a force measuring device with such an adapter body and force measuring device with such an adapter body Technical field

[0001] The invention relates to an adapter body for a force measuring device, a method for providing a force measuring device with such an adapter body and a force measuring device with such an adapter body according to the preambles of the independent claims. State of the art

[0002] Force measuring devices enable the measurement of force in a wide variety of applications in industrial manufacturing and research.

[0003] German patent DE2132012A1 discloses a force measuring device with a cylindrical housing having end faces and lateral surfaces. The height of the cylindrical housing is less than its radius. The housing has an interior space. One of the end faces serves to introduce the force to be measured into the interior space. Inside the interior are rib-shaped deformation elements on which strain gauges are arranged. The strain gauges are connected as a measuring bridge. The introduced force causes a deformation of the deformation elements, which deformation changes the electrical resistance of the measuring bridge. The change in the electrical resistance The resistance of the measuring bridge is proportional to the magnitude of the applied force.

[0004] Typically, the change in the electrical resistance of the measuring bridge is detected as an electrical voltage and forms the measurement signal. Since the measurement signal of a force measuring device with strain gauges changes only slightly over time, it is very well suited for the static measurement of a force over long measurement periods of 10 or more. 3 sec.

[0005] Due to the measuring principle using deformation bodies, a force measuring device with strain gauges exhibits low stiffness compared to a piezoresistive or piezoelectric force measuring device. And since stiffness is proportional to the natural frequency of the force measuring device, the low stiffness also results in a comparatively low natural frequency, which limits the measuring frequency. Therefore, a force measuring device with strain gauges is comparatively unsuitable for the dynamic measurement of force at high measuring frequencies of ≥ 10 Hz. 4 Hz .

[0006] Force measuring devices are often placed on machine structures with limited space. Therefore, the force measuring device should have the smallest possible external dimensions.

[0007] To achieve high resolution in force measurement, the force measuring device is placed on the machine structure, if possible in the main force path, where most of the force to be measured is transferred to the force measuring device. The force is introduced. It is desirable to adjust the size of the force introduction element, into which the force to be measured is introduced into the force measuring device, simply and cost-effectively, so that it corresponds to the size of the machine structure surface covered by the force to be measured.

[0008] The present invention therefore aims to create a force measuring device that is suitable for the static measurement of a force over long measurement periods, that allows the dynamic measurement of a force with high measurement frequencies, that is also suitable for machine structures with limited space, and whose size of a force introduction element is easily and cost-effectively adjustable. Description of the invention

[0009] At least one of these tasks is solved by the features of independent claims.

[0010] The invention relates to an adapter body for a force measuring device for measuring a force; which adapter body has a connection opening for connecting a pressure sensor; wherein the adapter body has a force introduction element for introducing the force to be measured, which force introduction element has a planar extension; and wherein the adapter body has an interior space for filling with a fluid, which interior space connects the force introduction element to the connection opening.

[0011] According to the invention, an adapter body is used for force measurement, into which the force to be measured is introduced. The adapter body has a force introduction element with a planar extension. The force to be measured is introduced into the force introduction element. The use of the adapter body allows for flexible adaptation of the force measuring device to the confined space of a machine structure that generates the force to be measured. Several adapter bodies with different planar extensions of the force introduction element can be provided for the force measuring device, so that an adapter body suitable for the confined space can be selected.Furthermore, the use of the adapter body also allows for flexible adjustment of the size of the area of ​​the force introduction element to the size of the area of ​​a machine structure surface which is covered with the force to be measured, so that the force measuring device is placed in the main force connection on the machine structure where the largest part of the force to be measured is introduced into the force measuring device, which enables a measurement of the force with high resolution.

[0012] The invention also relates to a method for providing a force measuring device for measuring a force; with an adapter body for a pressure sensor, which adapter body has an interior for filling with a fluid, and which adapter body has a connection opening for connecting the pressure sensor; wherein the interior is filled with the fluid; and wherein the pressure sensor is connected to the connection opening.

[0013] According to the invention, the force measuring device comprises, in addition to the adapter body, a fluid and a pressure sensor. This allows the selection of an adapter body suitable for the limited space available on the machine structure from among several available adapter bodies. Alternatively, an adapter body can be selected from several available adapter bodies whose surface area of ​​the force application element best corresponds to the surface area of ​​a surface of the machine structure. The force measuring device is then assembled using this selected adapter body. For this purpose, the interior is filled with fluid and the pressure sensor is connected to the connection opening.

[0014] The invention further relates to a force measuring device for measuring a force; comprising an adapter body for a pressure sensor, which adapter body has a connection opening for connecting the pressure sensor; which pressure sensor is connected to the connection opening; wherein the adapter body has a force introduction element for introducing the force to be measured, which force introduction element has a planar extension; wherein the adapter body has an interior space, which interior space connects the force introduction element to the connection opening, and which interior space is filled with a fluid; wherein the force introduction element is configured to transmit the introduced force into the fluid in the interior space; and wherein the force transmitted into the fluid in the interior space acts on the pressure sensor via the fluid in the interior space.

[0015] According to the invention, the force measuring device uses a pressure sensor to measure the force to be measured. The force is introduced into the force introduction element of the adapter body. From the force introduction element, it is transferred to the fluid inside the adapter body and acts on the pressure sensor connected to the connection opening. The force measuring device comprises the components adapter body, fluid, and pressure sensor. All these components are of high rigidity, which enables dynamic force measurement at high measurement frequencies of ≥ 10 4 Hz enables this. Furthermore, the provision of a piezoresistive pressure sensor allows the static measurement of force over long measurement periods of greater than or equal to 10 3 sec. And the provision of a piezoelectric pressure sensor enables the static measurement of large forces in the range of 10 3 up to 10 7 N over long measurement durations of greater than or equal to 10 3sec.

[0016] Advantageous further developments of the invention are protected in the dependent claims. Brief description of the drawings

[0017] The invention will now be explained in more detail using two exemplary embodiments and the figures shown. Fig. 1 shows a cross-section through a part of a first embodiment of a force measuring device SD with an adapter body AB for a pressure sensor PS; Fig. 2 shows a part of the adapter body AB of the first embodiment of the force measuring device SD according to Fig. 1 along a section line A - A; Fig. 3 shows a cross-section through part of a second embodiment of a force measuring device SD with an adapter body AB for a pressure sensor PS; Fig. 4 shows a section of part of the adapter body AB of the second embodiment of the force measuring device SD according to Fig. 3 along a section line B - B; and Fig. 5 shows a schematic view of the force measuring device SD according to Figs. 1 to 4 when measuring the force F of a machine structure MS.

[0018] The same reference symbols denote the same objects in the figures. Ways to implement the invention

[0019] The force measuring device SD has an adapter body AB for a pressure sensor PS.

[0020] Figures 1 and 2 show part of a first embodiment of a force measuring device SD. Figures 3 and 4 show part of a second embodiment of a force measuring device SD. The force measuring device SD is represented in a rectangular coordinate system with a longitudinal axis X, a horizontal axis Y, and a vertical axis Z. Figures 1 and 3 are cross-sections of the force measuring device SD in a vertical plane XZ defined by the longitudinal axis X and the vertical axis Z. Figure 2 shows a portion of the adapter body AB along a section line A-A as per Figure 1 in a horizontal plane XY defined by the longitudinal axis X and the horizontal axis Y. Figure 4 shows a portion of the adapter body AB along a section line B-B as per Figure 3 in a horizontal plane XY defined by the longitudinal axis X and the horizontal axis Y.

[0021] The adapter body AB is made of mechanically resistant material such as steel, stainless steel, etc. The adapter body AB is cylindrical or hollow cylindrical. In the example shown in Fig. 1, the adapter body AB is cylindrical. It has a first end face ABI, a second end face AB2, and a lateral surface AB3. The two end faces ABI and AB2 define the adapter body AB in the direction of the vertical axis Z. The two end faces ABI and AB2 run largely parallel to the horizontal plane XY. In the cross-section shown in Figs. 1 and 3, the first end face ABI is located above the second end face AB2 with respect to the horizontal plane XY. The lateral surface AB3 defines the adapter body AB in the direction of the longitudinal axis X and in the direction of the horizontal axis Y. The lateral surface AB3 runs perpendicular to the horizontal plane XY. The adapter body AB has a depth ABD.The depth ABD is the shortest length of the lateral surface AB3 measured parallel to the vertical axis Z between the first end face ABI and the second end face AB2.

[0022] Advantageously, the adapter body AB is two-part and comprises a membrane body 1 and a support body 2. The adapter body AB exhibits high rigidity.

[0023] A force F, to be measured by the force measuring device SD, is introduced into the adapter body AB via the membrane body 1. The membrane body 1 is disc-shaped. The membrane body 1 is bounded by the first end face ABI.

[0024] The membrane body 1 has a region radially inward with respect to the vertical axis Z; this region forms a force introduction element 11 for introducing the force F. The force F is represented as an arrow in Figures 1 and 3. The force introduction element 11 is arranged in the membrane body 1. The force introduction element 11 is located in the first end face ABI.

[0025] The membrane body 1 has a region extending radially outward with respect to the vertical axis Z, forming a flange 12. The membrane body 1 also has an annular groove 13. As can be seen in Figures 2 and 4, the groove 13 completely encloses the force introduction element 11 on the first end face ABI and separates the force introduction element 11 from the flange 12. The groove 13 is a recess extending in the direction of the vertical axis Z in the first end face ABI.

[0026] A planar extension 11A of the force introduction element 11 extends parallel to the horizontal plane XY. With respect to the vertical axis Z, the force introduction element 11 has a constant thickness. Advantageously, the planar extension 11A is circular. The depth ABD of the adapter body AB extends perpendicularly to the horizontal plane XY and thus perpendicular to the planar extent 11A of the force introduction element 11.

[0027] The surface area 11A of the force introduction element 11 is greater than the depth ABD of the adapter body AB. In the first embodiment of the force measuring device SD according to Figures 1 and 2, the surface area 11A of the force introduction element 11 is more than three times greater than the depth ABD of the adapter body AB. In the second embodiment of the force measuring device SD according to Figures 3 and 4, the surface area 11A of the force introduction element 11 is more than twice greater than the depth ABD of the adapter body AB. Advantageously, several adapter bodies AB with different surface areas 11A of the force introduction element 11 are provided to the user of the force measuring device SD. Thus, a first of the several adapter bodies AB can have a planar extent 11A of the force introduction element 11 of twice the depth ABD of the adapter body AB .A second of the multiple adapter bodies AB can have a surface area 11A of the force introduction element 11 of three times the depth ABD of the adapter body AB. A fourth of the multiple adapter bodies AB can have a surface area 11A of the force introduction element 11 of four times the depth ABD of the adapter body AB. A fifth of the multiple adapter bodies AB can have a surface area 11A of the force introduction element 11 of five times the depth ABD of the adapter body AB. For a depth ABD of the adapter body AB, which is, for example, 70 mm, the surface area 11A of the force introduction element can be in the range of 140 mm to 350 mm. In the first embodiment.

[0028] The membrane body 1 is inserted into the support body 2, and the pressure sensor PS is connected to it. The support body 2 is pot-shaped with a base 23, an interior 22, and a rim 24. The base 23 is a region of the support body 2 located largely below the vertical plane XY and is bounded by the second end face AB2. The rim 24 is a region of the support body 2 located radially outside the vertical axis Z and is bounded by the lateral surface AB3 and the first end face ABI. In the cross-section of Figures 1 and 3, the interior 22 of the support body 2 is located between the rim 24 of the support body 2 and extends in the direction of the vertical axis Z from the vertical plane XY to the first end face ABI.

[0029] The membrane body 1 is inserted into the interior 22 of the support body 2 and, when inserted, hermetically seals the interior 22 against the first end face ABI. For the purposes of the invention, "hermetically sealed" means that no medium such as air, water, oil, etc., can escape from the interior 22 to the outside of the adapter body AB, and that no such medium can enter the interior 22 from the outside of the adapter body AB. The seal can be force-fit, form-fit, force-fit / form-fit, or material-fit, such as a screw connection, a press fit, a welded connection, etc. As can be seen in Figures 1 and 3, the flange 12 of the membrane body 1 and the edge 24 of the support body 2 are located at the same distance from the longitudinal axis X in the first end face ABI. Advantageously, the closure is a welded connection in the first end face ABI between the flange 12 of the membrane body 1 and the edge 24 of the support body 2 .

[0030] The adapter body AB has a connection opening 21 for connecting the pressure sensor PS. The connection opening 21 is located in the support body 2. The connection opening 21 is located in the outer surface AB3. The connection opening 21 is a cylindrical recess in the outer surface AB3 in the direction of the longitudinal axis X.

[0031] The pressure sensor PS is connected to the connection opening 21 via a connection. This connection can be force-fit, form-fit, force / form-fit, or material-fit, such as a screw connection, a press fit, a weld connection, etc. Advantageously, the connection opening 21 has an internal thread for a standardized screw connection such as M4, M5, M6, etc. The pressure sensor PS has a corresponding external thread. By screwing the external thread of the pressure sensor PS into the internal thread of the connection opening 21, the pressure sensor PS is connected to the adapter body AB. In the connected state, the pressure sensor PS hermetically seals the connection opening 21. For the purposes of the invention, "hermetically sealed" means that no medium such as air, water, oil, etc., can escape from the connection opening 21 to the outside of the adapter body AB, and that no such medium can enter the connection opening 21 from outside the adapter body AB.

[0032] The PS pressure sensor is a piezoresistive pressure sensor or a piezoelectric pressure sensor. The PS pressure sensor exhibits high stiffness.

[0033] E such a piezoresistive pressure sensor is produced and distributed by the applicant as type 4007D and The datasheet 4007D_003-300e-03.23 describes the type 4007D. It can be connected to the connection opening 25 via an M5 external thread. The measuring range of the type 4007D is from 0 bar to 250 bar. The type 4007D is designed for operating temperatures up to 200 °C. The type 4007D has a natural frequency greater than 100 kHz. The type 4007D weighs 3 g without the connector.

[0034] When connected to the SD force measuring device, the type 4007D is suitable for the static measurement of force F over long measurement periods of greater than or equal to 10 3sec. Due to its natural frequency of greater than 100 kHz, the type 6054C is suitable for the dynamic measurement of force F with high measurement frequencies of greater than or equal to 10 4 Hz.

[0035] Such a piezoelectric pressure sensor is produced and distributed by the applicant as type 6054C and is described in datasheet 6054C_003-458e-03.24. Type 6054C can be connected to the connection opening 25 via an M5 external thread. The measuring range of type 6054C extends from 0 bar to 300 bar. Type 6054C is designed for operating temperatures up to 350 °C. Type 6054C has a natural frequency of 185 kHz. Type 6054C weighs 1.5 g without the connector.

[0036] When connected to the SD force measuring device, the type 6054C is suitable for the static measurement of large forces in the range of 10 3 up to 10 7 N over long measurement durations of greater than or equal to 10 3sec. Due to its high natural frequency of 185 kHz, the type 6054C is suitable for dynamic measurement- Measurement of force F with high measurement frequencies of greater than or equal to 10 4 Hz .

[0037] The pressure sensor PS is cylindrical. Advantageously, the pressure sensor PS has a diameter PS I in the direction of the vertical axis Z, which diameter PS I is smaller than the depth ABD of the adapter body AB.

[0038] A region of the interior 22 of the supporting structure 2 forms a channel system. At the force introduction element 11, the interior 22 forms a channel basin 221 parallel to the horizontal zonal plane XY. The channel basin 221 borders directly on the force introduction element 22. With respect to the vertical axis Z, the channel basin 221 is located directly below the force introduction element 11. A planar extension 221A of the channel basin 221 extends parallel to the horizontal zonal plane XY. The planar extension 221A of the channel basin 221 extends over the entire planar extension 11A of the force introduction element 11. In the direction of the vertical axis Z, the channel basin 221 has a depth 221D. The depth 221D extends perpendicular to the planar extension 221A of the channel basin 221. The depth 221D of the channel basin 221 is at least five times smaller, preferably at least ten times smaller, than the planar extent 221A of the channel basin 221 .The interior space 22 connects the force introduction element 11 with the connection opening 21. For this purpose, the interior space 22 forms a connection channel 222. The connection channel 222 extends from the channel basin 221 below the force introduction element 11 to the connection opening 21.

[0039] The interior space 22 is filled with a fluid 3. The force application element 11 transmits the force F to be measured into the fluid 3 in the interior space 22. The transmitted force F acts on the pressure sensor PS via the fluid 3 in the interior space 22. The fluid 3 can be an oil such as silicone oil, paraffin oil, etc. To a first approximation, the fluid 3 is an incompressible liquid. Due to its incompressibility, the fluid 3 exhibits high stiffness. The incompressibility of the fluid 3 ensures that the force F transmitted into the fluid 3 in the interior space 22 acts on the pressure sensor PS via the fluid 3 in the interior space 22 with virtually no loss.

[0040] The interior 22 of the support body 2 is filled with fluid 3 via at least one opening in the support body 2. During filling with fluid 3, air also escapes from the interior 22 through this opening. The opening can be the connection opening 21 for connecting the pressure sensor PS. However, as shown in Figures 1 to 4, the opening can also be a dedicated filling opening 25 for filling the interior 22 with fluid 3. In the first embodiment of the force measuring device SD according to Figures 1 and 2, the filling opening 25 is located in the outer surface AB3 of the support body 2. Here, the filling opening 25 is a cylindrical recess in the outer surface AB3 in the direction of the longitudinal axis X. In the second embodiment of the force measuring device SD according to Figures 3 and 4, the filling opening 25 is located in the second end face AB2 of the support body 2.Here, the filling opening 25 is a cylindrical depression in the second end face AB2 in the direction of the longitudinal axis X.

[0041] The interior space 22 connects the force introduction element 11 with the filling opening 25. For this purpose, the interior space 22 forms a filling channel 223. The filling channel 223 extends from the channel basin 221 below the force introduction element 11 to the filling opening 25.

[0042] The force measuring device SD is designed for operating temperatures up to 350 °C. At such high operating temperatures, the different coefficients of thermal expansion of the adapter body 2 and the fluid 3, as well as the temperature dependence of the viscosity of the fluid 3, influence the transmission of the force F via the fluid 3 in the interior 22 of the support body 2 and thus also the measurement of the force F. To minimize this influence, the volume of the interior 22 filled with fluid 3 is kept as small as possible. Advantageously, the interior 22 filled with fluid 3 consists of the channel basin 221, the connecting channel line 222, and the filling channel line 223. The volume of the channel basin 221 is significantly larger than the volume of the connecting channel line 222 or the volume of the filling channel line 223.The volume of the channel basin 221 is at least five times larger or at least ten times larger than the volume of the connecting channel line 222 or the volume of the filling channel line 223. The volume of the channel basin 221 is also as small as possible. This small volume of the channel basin 221 is achieved by a shallow depth 221D of the channel basin 221 compared to its surface area 221A.

[0043] The adapter body AB has a closure unit 4 for closing the filling opening 25. Advantageous- The locking unit 4 consists of a locking screw 41 and a locking ball 42. The locking screw 41 and the locking ball 42 are made of mechanically resistant material such as steel, stainless steel, etc.

[0044] Before filling the interior 22 with fluid 3, the membrane body 1 is inserted into the interior 22 of the support body 2, and the interior 22 is hermetically sealed in the area of ​​the membrane body 2 opposite the first end face ABI. Also before filling the interior 22 with fluid 3, the pressure sensor PS is connected to the connection opening 21, and the connection opening 21 is hermetically sealed. To fill the interior 22 with fluid 3, the sealing screw 41 and the sealing ball 42 are removed from the filling opening 25. The fluid 3 is then poured into the filling opening 25. Advantageously, the adapter body AB is oriented with its longitudinal axis X in the direction of gravity so that the fluid 3 flows into the interior 22 due to gravity. The interior 22 is completely filled with fluid 3.

[0045] The filling opening 25 is closed by the closure unit 4 via a connection. The connection can be force-fit, form-fit, force / form-fit, or material-fit, such as a screw connection, a press fit, a weld connection, etc. Advantageously, the filling opening 25 has an internal thread for a standardized screw connection such as M2, M3, M4, etc. The closure screw 41 has a corresponding external thread.

[0046] To close the filling opening 25, the sealing ball 42 is inserted into the filling opening 25. Advantageously, the diameter of the sealing ball 42 is larger than the diameter of the opening of the filling channel line 223 in the area of ​​the filling opening 25, so that the inserted sealing ball 42 covers the filling channel line 223. The sealing screw 41 is then screwed with its external thread into the internal thread of the filling opening 25. The dimensions of the filling opening 25, the sealing screw 41, and the sealing ball 42 are designed such that the screwed-in sealing screw 41 mechanically contacts the sealing ball 42 and presses the sealing ball 42 against the rim of the opening of the filling channel line 223 in the area of ​​the filling opening 25, thus hermetically sealing the filling opening 25. For the purposes of the invention, "hermetically sealed" means that no medium such as air, water, oil, etc., can enter.from the filling opening 25 to outside the adapter body AB and that no such medium reaches the filling opening 25 from outside the adapter body AB.

[0047] Fig. 5 shows a schematic view of the force measuring device SD according to Figs. 1 to 4 during the measurement of the force F generated by a machine structure MS. The machine structure MS is cylindrical. The machine structure MS has a surface MSI, which extends with a planar extent MS1A parallel to the horizontal plane XY. The surface MSI is covered with the force F to be measured. The force F is represented as an arrow in Fig. 5. The force measuring device SD is placed on the machine structure MS via the adapter body AB. The placement can be force-fit, form-fit, or force-lock. / form-fitting or material-fitting, such as by means of a screw connection, a press connection, a welded connection, etc.

[0048] Advantageously, the user of the force measuring device SD is provided with several adapter bodies AB with different surface areas 11A of the force introduction element 11. These different surface areas 11A of the force introduction element 11 allow the size of the surface area 11A of the force introduction element 11 to be adapted to the size of the surface area MS 1A of the machine structure surface MS I.

[0049] Space is often limited on the machine structure MS. The user of the force introduction element 11 can therefore select from the several adapter bodies AB provided to him the one that fits into the limited space on the machine structure MS.

[0050] The user of the force introduction element 11 can also select from among the several adapter bodies AB provided to him the one whose area 11A of the force introduction element 11 best matches the area MS 1A of the machine structure surface MS I, so that the force measuring device SD with the selected adapter body AB is placed in the main force connection on the machine structure MS, where the largest part of the force to be measured is introduced into the force measuring device SD, which enables a measurement of the force F with high resolution.

[0051] Referring to the description in Figures 1 to 4, the force introduction element 11 is designed to transmit the introduced force F into the fluid 3 in the interior 22. The force F transmitted into the fluid 3 in the interior 22 acts via the fluid 3 in the interior 22 on the pressure sensor PS. Reference symbol list A - A Section path of the first execution form AB adapter body ABI, AB2 End faces of the adapter body AB3 Surface area of ​​the adapter body ABD Depth of the adapter body B - B section of the second version F force MS machine structure MS I machine structure surface MS 1A area-wide extension of the machine structure surface PS pressure sensor PS I Diameter of the pressure sensor SD force measuring device X Longitudinal axis Y horizontal axis XY horizontal plane XZ Vertical plane Z vertical axis 1 Membrane body 2 support structures 3 Fluid 4 locking unit 11 Force introduction element 11A Planar extension of the force introduction element 12 flange 13 Nut 21 Connection opening 22 Interior 23 Floor Edge filling opening, sealing screw, sealing ball, channel basin A, surface area of ​​the channel basin D, depth of the channel basin, connecting channel pipe, filling channel pipe

Claims

Patent claims 1. Adapter body (AB) for a force measuring device (SD) for measuring a force (F); which adapter body (AB) has a connection opening (21) for connecting a pressure sensor (PS) has; characterized in that the adapter body (AB) has a force introduction element (11) for introducing the force (F) to be measured, which force introduction element (11) has a planar extension (11A); and that the adapter body (AB) has an interior space (22) for filling with a fluid (3), which interior space (22) connects the force introduction element (11) to the connection opening (21).

2. Adapter body (AB) according to claim 1, characterized in that the adapter body (AB) has a membrane body (1) and a support body (2); that the force introduction element (11) is arranged in the membrane body (1); that the connection opening (21) and the interior (22) are arranged in the support body (2).

3. Adapter body (AB) according to claim 2, characterized in that the membrane body (1) is inserted into the interior (22); and that the membrane body (1) inserted into the interior (22) hermetically seals the interior (22).

4. Adapter body (AB) according to one of claims 1 to 3, characterized in that the adapter body (AB) is cylindrical and has a first end face (ABI); that the force introduction element (11) is located in the first end face- before (ABI) is arranged; and that the connection opening (21) is arranged in the lateral surface (AB3).

5. Adapter body (AB) according to claim 4, characterized in that the interior (22) forms a channel basin (221) at the planar extension (11A) of the force introduction element (11).

6. Adapter body (AB) according to claim 5, characterized in that the channel basin (221) has a planar extent (221A) which planar extent (221A) extends over the entire planar extent (11A) of the force introduction element (11).

7. Adapter body (AB) according to one of claims 5 or 6, characterized in that the channel basin (221) has a depth (221D) which depth (221D) extends perpendicular to the planar extent (221A) of the channel basin (221), and which depth (221D) is at least five times smaller, preferably at least ten times smaller than the planar extent (221A) of the channel basin (221).

8. Adapter body (AB) according to one of claims 5 to 7, characterized in that the interior (22) has a connecting channel line (222) which connecting channel line (222) extends from the channel basin (221) to the connection opening (21).

9. Adapter body (AB) according to one of claims 5 to 8, characterized in that the adapter body (AB) is cylindrical and has a second end face (AB2) and a lateral surface (AB3); that the adapter body (AB) a filling opening (25) for filling the interior (22) with fluid (3); that the filling opening (25) is arranged in the second end face (AB2) or in the outer surface (AB3); that the interior (22) has a filling channel line (223) which filling channel line (223) extends from the channel basin (221) to the filling opening (25).

10. Adapter body (AB) according to one of claims 1 to 9, characterized in that the adapter body (AB) has a depth (ABD) in a direction perpendicular to the planar extent (11A) of the force introduction element (11); and that the planar extent (11A) of the force introduction element (11) is greater than the depth (ABD) of the adapter body (AB).

11. Method for providing a force measuring device (SD) for measuring a force (F); with an adapter body (AB) for a pressure sensor (PS), the adapter body (AB) having an interior (22) for filling with a fluid (3), and the adapter body (AB) having a connection opening (21) for connecting the pressure sensor (PS); characterized in that the interior (22) is filled with the fluid (3), and the pressure sensor (PS) is connected to the connection opening (21).

12. Method according to claim 11, characterized in that the force measuring device (SD) is placed on a machine structure (MS) via the adapter body (AB), which machine structure (MS) is a machine structure surface (MSI) indicates which machine structure surface (MSI) is occupied by the force (F) to be measured; that several adapter bodies (AB) with different area dimensions (11A) of the force introduction element (11) are provided for the placement of the force measuring device (SD); that among the several provided adapter bodies (AB), the one is selected whose area dimension (11A) of the force introduction element (11) best matches the area dimension (MS1A) of the machine structure surface (MSI); and that the pressure sensor (PS) is connected to the connection opening (21) on this selected adapter body (AB), the fluid (3) is filled into the filling opening (25) until the interior (22) is completely filled with fluid (3); and the filling opening (25) is closed.

13. Force measuring device (SD) for measuring a force (F); with an adapter body (AB) for a pressure sensor (PS), the adapter body (AB) having a connection opening (21) for connecting the pressure sensor (PS); the pressure sensor (PS) being connected to the connection opening (21); characterized in that the adapter body (AB) has a force introduction element (11) for introducing the force (F) to be measured, the force introduction element (11) having a planar extension (11A); that the adapter body (AD) has an interior space (22), the interior space (22) connecting the force introduction element (11) to the connection opening (21), and the interior space (22) being filled with a fluid (3); that the force introduction element (11) is configured to transmit the introduced force (F) into the fluid (3) in the interior space (22); and that the The force (F) transmitted through the fluid (3) in the interior (22) acts on the pressure sensor (PS).

14. Force measuring device (SD) according to claim 13, characterized in that the adapter body (AB) is cylindrical and has a first end face (ABI) and a lateral surface (AB3); that the force introduction element (11) is arranged in the first end face (ABI); that the connection opening (21) is arranged in the lateral surface (AB3); that the adapter body (AB) has a depth (ABD) in a direction perpendicular to the planar extent (11A) of the force introduction element (11); and that the pressure sensor (PS) has a diameter (PSI) in the direction perpendicular to the planar extent (11A) of the force introduction element (11), which is smaller than the depth (ABD) of the adapter body (AB).

15. Force measuring device (SD) according to one of claims 13 or 14, characterized in that the pressure sensor (PS) is a piezoresistive pressure sensor or a piezoelectric pressure sensor.

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