CN114778045A - Two-force rod measuring foot structure and moment measuring platform - Google Patents

Abstract

The invention provides a two-force-rod measuring foot structure and a moment measuring platform. Each two-force rod measuring foot structure comprises a loading block, a rotating mechanism, a base and a measuring unit, wherein the rotating mechanism comprises a first rotating structure and a second rotating structure, and the first rotating structure is arranged on the bottom surface of the loading block; the base is arranged below the loading block, and the second rotating structure is arranged on the top surface of the base; the measuring unit is made of elastic materials and is arranged between the first rotating structure and the second rotating structure. Because the measuring unit, the first rotating structure and the second rotating structure are detachably locked, the torque measuring platform can meet the measuring requirement of a low-frequency or high-frequency vibration source by replacing different measuring units, and the testing capability of the torque measuring platform is widened.

Description

Two-force-rod measuring foot structure and moment measuring platform

Technical Field

The invention relates to the field of micro-vibration measurement, in particular to a two-force rod measuring foot structure and a moment measuring platform.

Background

With the continuous improvement of the precision of optical facilities, the influence of vibration on the optical facilities is more and more obvious, and the micro vibration can cause serious interference on the pointing direction, the imaging and the like of the optical facilities, so that the ground vibration detection is indispensable to the optical facilities. The forces that the optical installation needs to be measured vary from a few newtons to several thousand newtons, so that the measuring device needs to have the characteristics of high precision, large load and large size.

At present, most vibration sources adopt a piezoelectric structure for vibration disturbance force measurement, and a Stewart structure is the most common, but the fundamental frequency of a measurement platform is inevitably reduced by a loose Stewart structure, and although piezoelectric ceramics have good high-frequency dynamic characteristics and high sensitivity, the low-frequency dynamic characteristics of the piezoelectric ceramics often have poor performance. Because no measurement mode has good high-low dynamic characteristics, if the disturbance vibration force of a high-low frequency vibration source is required to be accurately measured, two sets of equipment have to be used for measurement.

Therefore, it is highly desirable to design a torque measurement platform, which has high fundamental frequency and load capacity, and can satisfy the requirements for measuring a low-frequency vibration source and a high-frequency vibration source after slightly adjusting the components of the measurement platform.

Disclosure of Invention

The invention provides a two-force rod measuring foot structure and a moment measuring platform in order to overcome the defects in the prior art, wherein the moment measuring platform can be used for measuring the disturbance vibration force of a high-frequency and low-frequency large-mass vibration source, has lower dimensional coupling and higher sensitivity, can reduce the measurement error to a great extent, improves the measurement precision, and can be applied to ground vibration detection of equipment with high measurement precision requirements and large mass, such as optical facilities and the like.

In order to achieve the purpose, the invention provides the following specific technical scheme:

in a first aspect, the present invention provides a two-force lever measurement foot structure, comprising a loading block, a rotation mechanism, a base, and a measurement unit:

the top surface of the loading block is provided with at least one first positioning hole;

the rotating mechanism comprises a first rotating structure and a second rotating structure, and the first rotating structure is arranged on the bottom surface of the loading block;

the base is arranged below the loading block, and the second rotating structure is arranged on the top surface of the base;

the measuring unit is made of elastic materials and is arranged between the first rotating structure and the second rotating structure.

As an alternative embodiment, the number of the rotating mechanisms and the measuring units is multiple, one rotating mechanism corresponds to one measuring unit, and one rotating mechanism comprises a first rotating structure and a second rotating structure;

the plurality of first rotating structures are annularly distributed on the bottom surface of the loading block, and included angles between adjacent first rotating structures are the same;

the second rotating structures are annularly distributed on the top surface of the base, and included angles between adjacent second rotating structures are the same.

As an alternative embodiment, the number of the first rotating structure, the second rotating structure and the measuring unit is 3.

As an alternative embodiment, the first rotating structure is a first spherical hinge bearing, the second rotating structure is a second spherical hinge bearing, the measuring unit and the first spherical hinge bearing are locked together by a first thread, the measuring unit and the second spherical hinge bearing are locked together by a second thread, and the setting directions of the first thread and the second thread are opposite.

As an optional embodiment, the measuring unit is a strain gauge measuring unit, 4n strain gauges are arranged on the strain gauge measuring unit, and 4n strain gauges form a full-bridge circuit by 4 strain gauges; n is a positive integer.

As an optional embodiment, the thickness of the measuring unit is smaller than the preset thickness value, and the shape of the measuring unit is any one of an S shape, an O shape or a square shape.

As an optional embodiment, the measuring unit is a piezoelectric measuring unit, and the piezoelectric measuring unit includes piezoelectric ceramics, a first clamping block and a second clamping block, where the first clamping block and the second clamping block are respectively disposed on upper and lower sides of the piezoelectric ceramics to clamp the piezoelectric ceramics.

As an optional embodiment, the bottom surface of the loading block is further provided with a limit groove; the two-force rod measuring foot structure further comprises an overload protection structure;

the overload protection structure comprises a supporting column and a limiting piece, wherein the supporting column is arranged on the top surface of the base; the limiting part is arranged in the limiting groove and is in clearance fit with the groove wall of the limiting groove.

In a second aspect, the invention also provides a moment measurement platform comprising at least two-force rod measurement foot structures and a stand;

the two-force rod measuring foot structure is the two-force rod measuring foot structure described in the first aspect of the invention;

the object placing table is arranged above the two or more force rod measuring foot structures, and the bottom surface of the object placing table is provided with a second positioning hole at the corresponding position of the first positioning hole.

As an optional embodiment, the placing table is further provided with a counter bore, a weight reduction groove and a plurality of reinforcing ribs;

the counter bore penetrates through the object placing table along the thickness direction of the object placing table and is arranged on the bottom surface of the object placing table;

the weight reduction groove is arranged on the bottom surface of the object placing table around the counter bore;

the reinforcing ribs are arranged in the weight reducing grooves and perpendicular to the bottom surface of the object placing table, and each reinforcing rib is arranged between two different groove walls of the weight reducing grooves along the length direction or between the groove wall of the weight reducing groove and the outer side edge of the counter bore.

The invention can obtain the following technical effects:

the invention provides a two-force-rod measuring foot structure and a moment measuring platform. Each two-force-rod measuring foot structure comprises a loading block, a rotating mechanism, a base and a measuring unit, wherein the rotating mechanism comprises a first rotating structure and a second rotating structure, and the first rotating structure is arranged on the bottom surface of the loading block; the base is arranged below the loading block, and the second rotating structure is arranged on the top surface of the base; the measuring unit is made of elastic materials and is arranged between the first rotating structure and the second rotating structure. Because the measuring unit, the first rotating structure and the second rotating structure are detachably locked, the torque measuring platform can meet the measuring requirement of a low-frequency or high-frequency vibration source by replacing different measuring units, and the testing capability of the torque measuring platform is widened.

Drawings

Fig. 1 is a schematic structural diagram of a torque measurement platform according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a two-force stick measurement foot configuration according to an embodiment of the present invention;

FIG. 3 is a top view of a platform according to an embodiment of the present invention;

FIG. 4 is a bottom view of the platform according to one embodiment of the present invention;

FIG. 5 is a diagram illustrating a structure of a load block according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an overload protection structure according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a rotating mechanism and an S-shaped measuring unit according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a rotating mechanism and an O-ring measuring unit according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a rotation mechanism and a square-shaped measurement unit according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a piezoelectric measuring unit according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a full bridge circuit according to an embodiment of the invention.

Reference numerals:

1. a placing table;

11. a counter bore;

12. a fifth positioning hole;

13. a second positioning hole;

14. a weight reduction groove;

15. reinforcing ribs;

2. a two-force rod measuring foot structure;

21. loading a block;

211. a third positioning hole;

212. a limiting groove;

213. a first positioning hole;

22. a rotating mechanism;

221. a fourth positioning hole;

23. a measuring unit;

231. an S-shaped measuring unit;

232. an O-shaped measuring unit;

233. a square measuring unit;

234. a piezoelectric type measuring unit;

2341. piezoelectric ceramics;

2342. a first clamping block;

2343. a second clamping block;

24. a base;

241. a sixth positioning hole;

242. a seventh positioning hole;

243. an eighth positioning hole;

25. an overload protection structure;

251. a limiting member;

252. and a ninth positioning hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 2, in a first aspect, the present invention provides a two-force lever measuring foot structure 2, where the two-force lever measuring foot structure 2 includes a loading block 21, a rotating mechanism 22, a base 24, and a measuring unit 23:

the top surface of the loading block 21 is provided with at least one first positioning hole 213;

the rotating mechanism 22 comprises a first rotating structure and a second rotating structure, and the first rotating structure is arranged on the bottom surface of the loading block 21;

the base 24 is arranged below the loading block 21, and the second rotating structure is arranged on the top surface of the base;

the measuring unit 23 is made of an elastic material and is disposed between the first rotating structure and the second rotating structure.

In this embodiment, the number of the first positioning holes 2118 is plural and is uniformly distributed on the top surface of the loading block 211. For example, the top surface of the loading block 211 has a rectangular shape, and the number of the first positioning holes 2118 is 4, which are respectively disposed at 4 corner positions of the top surface of the loading block 211.

The two-force rod measuring foot structure 2 can be placed at the bottom of the object placing table in the using process and used for supporting the object placing table, and the first positioning hole 213 in the top surface of the loading block 211 is matched with the bottom surface of the object placing table to fix the two. The object placing table can be used for placing a vibration source, and the vibration disturbing force is measured through the measuring unit 23 on the two-force rod measuring foot structure 2, so that the measuring platform has better low-frequency dynamic characteristics.

In some embodiments, as shown in fig. 2, the number of the rotating mechanism 22 and the measuring unit 23 is plural, one rotating mechanism 22 corresponds to one measuring unit 23, and one rotating mechanism 22 includes a first rotating structure and a second rotating structure; the plurality of first rotating structures are annularly distributed on the bottom surface of the loading block 21, and included angles between adjacent first rotating structures are the same; the plurality of second rotating structures are annularly distributed on the top surface of the base 24, and included angles between adjacent second rotating structures are the same. Preferably, the number of the first rotating structures, the second rotating structures and the measuring units is 3, the included angle of the connecting lines of the adjacent first rotating structures is 120 degrees, and the included angle of the connecting lines of the adjacent second rotating structures is 120 degrees. Through setting up a plurality of ring distribution's slewing mechanism to place a plurality of measuring cell in wherein respectively, can make the power that each measuring cell received be pure axial force as far as, promote measurement accuracy.

In some embodiments, the first rotating structure is a first spherical hinge bearing, the second rotating structure is a second spherical hinge bearing, the measuring unit is locked with the first spherical hinge bearing through a first thread, the measuring unit is locked with the second spherical hinge bearing through a second thread, and the first thread and the second thread are arranged in opposite directions. The thread directions of the first spherical hinge bearing and the second spherical hinge bearing are set to be opposite, so that the measuring unit can be fastened or separated from the spherical hinge bearings at the two ends when being rotated, and the measuring unit is convenient to mount or replace. Of course, in other embodiments, the first rotating structure and the second rotating structure may also adopt other connection modes capable of releasing the degree of freedom.

In some embodiments, as shown in fig. 8-10, the measurement unit 23 is a strain gauge measurement unit, and 4n strain gauges are disposed on the strain gauge measurement unit, and each 4n strain gauges form a full bridge circuit by 4 groups; n is a positive integer.

For example, the two-force rod measuring foot structure comprises 3 rotating mechanisms and 3 measuring units, wherein 4 strain gauges can be arranged on each measuring unit, and the 3 measuring units are perpendicular to each other in the arrangement direction and can be respectively used for measuring the strain force conditions from the x direction, the y direction and the z direction in a space coordinate system. 3 measuring units 23 in the same two-force rod measuring foot structure 2 are arranged to be perpendicular to each other, so that coupling of different measuring units is less during measurement, decoupling is convenient, and measuring accuracy is higher. The 4 strain gauges on each strain type measuring unit can form a full-bridge circuit to improve the measuring sensitivity, and a two-force rod measuring foot structure can form three full-bridge circuits correspondingly to measure the forces acting on the loading block and coming from the x direction, the y direction and the z direction respectively. The connection schematic diagram of the full-bridge circuit is shown in fig. 12, and 4 strain gages on the same measuring unit correspond to R1, R2, R3 and R4 in the full-bridge circuit respectively.

Preferably, the thickness of the measuring unit is smaller than a preset thickness value, and the shape of the measuring unit is any one of an S shape, an O shape and a square shape. The strain type measuring unit is suitable for measuring a low-frequency vibration source due to the good low-frequency characteristic, and the S-shaped measuring unit 231 shown in FIG. 8 is suitable for measuring a low-frequency vibration source with relatively small mass and has higher sensitivity when measuring strain force; the O-shaped measuring unit 232 shown in fig. 9 and the square-shaped measuring unit 233 shown in fig. 10 are suitable for measuring a low-frequency vibration source having a relatively large mass.

The S-shaped measuring unit 231, the O-shaped measuring unit 232 and the square-shaped measuring unit 233 are all designed by thin plates (that is, the thickness of the measuring unit is smaller than a preset thickness value), and the value of the preset thickness value can be determined by simulation according to the requirements on the rigidity (fundamental frequency), sensitivity and the like of the whole moment measuring platform. Through the sheet design, can be so that strain gauge measuring element can take place great deformation when receiving the axial force, promote measuring sensitivity. Preferably, a strain gauge may be attached to a region where the strain gauge has a large strain.

In some embodiments, as shown in fig. 11, the measuring unit 23 is a piezoelectric measuring unit 234, the piezoelectric measuring unit 234 includes a piezoelectric ceramic 2341, a first clamping block 2342 and a second clamping block 2343, and the first clamping block 2342 and the second clamping block 2343 are respectively disposed on the upper side and the lower side of the piezoelectric ceramic 2341, and are used for clamping the piezoelectric ceramic 2341. First clamp piece 2342 and second clamp piece 2343 can be connected through the bolt, can exert certain pretightning force to piezoceramics 2341 through two clamp pieces like this for piezoceramics 2341 can not play at will in-process at measurement force degree, avoids producing the interference to measuring result.

In some embodiments, as shown in fig. 7, the bottom surface of the loading block 21 is further provided with a limiting groove 212; the two-force rod measuring foot structure 2 further comprises an overload protection structure 25; the overload protection structure 25 includes a supporting column and a limiting member 251, the supporting column is disposed on the top surface of the base; the position-limiting member 251 is disposed in the position-limiting groove 212 and is in clearance fit with the groove wall of the position-limiting groove 212. The clearance fit means that the position limiting member is disposed in the space range surrounded by the position limiting groove but is not in direct contact with the groove wall of the position limiting groove 212. The shape of the limiting groove 212 is preferably circular, the shape of the limiting member 251 is also circular, and the limiting member 251 is sleeved on the top surface of the supporting column. Of course, in other embodiments, the limiting groove 212 and the limiting member 251 may have other shapes, so long as the two are in clearance fit.

When the object placing table is installed above the two-force rod measuring foot structure, the overload protection structure 25 plays a role in limiting protection, and the measuring unit is prevented from being damaged due to excessive deformation. The working principle is as follows: when the object is not placed on the object placing table or the weight of the placed object does not meet the overload requirement, the limiting member 251 is not in contact with the wall of the limiting groove 212. When the object placed on the object placing table is overloaded, the groove wall of the limiting groove 212 can limit the moving area of the limiting part 251, and further the measuring unit 23 is prevented from being deformed greatly. The gap between the position-limiting groove 212 and the position-limiting member 251 can be obtained by a finite element method according to the load capacity of the measuring platform.

As shown in fig. 5, 8-10, a third positioning hole 211 is further disposed on the bottom surface of the loading block 21, a fourth positioning hole 221 is disposed on an end surface of the first rotating structure (e.g., the spherical hinge bearing located above in fig. 8-10) that is not connected to the measuring unit, and the third positioning hole 211 and the fourth positioning hole 221 are disposed at positions corresponding to each other, and they can be fixed by bolts, so that the first rotating structure can be fixed on the bottom surface of the loading block 21. When the number of the first rotating structures is multiple, for example, 3, as shown in fig. 5, the fourth positioning holes 221 are three groups and annularly distributed on the outer edge of the limiting groove, and each group of the fourth positioning holes 221 is used for fixing one first rotating structure. Each set of the fourth positioning holes 221 may include one or more fourth positioning holes, for example, fig. 5 illustrates that each set of the fourth positioning holes 221 includes four fourth positioning holes.

As shown in fig. 6, a sixth positioning hole 241 is disposed on the base 24 for fixing the two-force rod measurement foot structure on the vibration isolation table. As shown in fig. 6 and 7, the base 24 is provided with an eighth positioning hole 243, and the support column of the overload protection structure 25 is provided with a ninth positioning hole 252 on the end surface connected to the base 24. The eighth positioning hole 243 is preferably disposed at a middle position of the base, and the ninth positioning hole 252 corresponds to the eighth positioning hole 243, and the eighth positioning hole and the ninth positioning hole 252 can be locked by bolts, so that the supporting column can be fixed on the top surface of the base 24. The number of the ninth positioning holes 252 and the eighth positioning holes 243 is preferably multiple, for example, 4 in fig. 6 and 7, 4 eighth positioning holes 243 are uniformly distributed at the middle position of the top surface of the base 24, and 4 ninth positioning holes 252 are uniformly distributed on the end surface of the support column.

The base 24 is further provided with a seventh positioning hole 242, an end surface of the second rotating structure (such as the lower spherical hinge bearing in fig. 8-10) not connected to the measuring unit is provided with a tenth positioning hole (not labeled in fig. 8-10), and a position of the seventh positioning hole 242 on the base 24 corresponds to a position of the tenth positioning hole, and the seventh positioning hole and the tenth positioning hole can be fixed by bolts, so that the second rotating structure can be fixed on the top surface of the base 24. When the number of the second rotating structures is multiple, for example, 3, as shown in fig. 6, the seventh positioning holes 242 have three groups, which are annularly distributed on the outer edge of the eighth positioning hole 243, and each group of the seventh positioning holes 242 is used for fixing one second rotating structure. Each set of seventh positioning holes 242 may include one or more seventh positioning holes, for example, four seventh positioning holes 242 in fig. 6. Preferably, the sixth positioning hole 241, the seventh positioning hole 242, and the eighth positioning hole 243 are not overlapped with each other at the positions on the top surface of the base 24.

As shown in fig. 1, 3 and 4, in a second aspect, the present invention also provides a moment measuring platform comprising at least two-force-rod measuring foot structures 2 and a stand 1; each two-force-lever measuring foot structure 2 is a two-force-lever measuring foot structure as described in the first aspect of the invention; the object placing table 1 is disposed above the two or more two-force rod measuring foot structures 2, and the bottom surface of the object placing table 1 is provided with a second positioning hole 13 at a position corresponding to the first positioning hole 213. The second positioning hole 13 is used for matching with the first positioning hole 213 on the loading block 21, and the two-force rod measuring foot structure 2 is fixed at the bottom of the object placing table 1, on one hand, the two-force rod measuring foot structure has a supporting effect on the object placing table 1, and on the other hand, the two-force rod measuring foot structure 2 collects stress data through the measuring unit.

Preferably, the number of the two-force rod measuring foot structures is 4, and the object placing table is rectangular; the foot structure is measured to 4 two power poles and sets up respectively in 4 corner positions of putting the thing platform. The distribution mode can effectively improve the fundamental frequency (rigidity) of the measuring platform. In use, the height of the top surface of the loading block can be adjusted by rotating the threads between the measuring unit and the rotating mechanism in each two-force rod measuring foot structure, so that the top surfaces of the loading blocks of the 4 two-force rod measuring foot structures are located on the same plane.

As shown in fig. 3 and 4, the placing table 1 is further provided with a counter bore 11, a weight-reducing groove 14 and a plurality of reinforcing ribs 15. The counter bore 11 penetrates through the object placing table 1 along the thickness direction of the object placing table 1 and is arranged on the bottom surface of the object placing table 1; the weight reduction groove 14 is arranged on the bottom surface of the object placing table around the counter bore; the reinforcing ribs 15 are arranged in the weight-reducing grooves 14 and perpendicular to the bottom surface of the object placing table 1, and each reinforcing rib 15 is arranged between two different groove walls of the weight-reducing grooves 14 or between the groove wall of the weight-reducing groove 14 and the outer edge of the counter bore 11 along the length direction. A plurality of strengthening ribs 15 can be arranged in array, also can crisscross the arranging, effectively alleviate the holistic quality of measuring platform when strengthening moment measuring platform global rigidity.

On the basis of each embodiment, assuming that 4 two-force-rod measuring foot structures 2 are arranged below the object placing table, and 3 measuring units are arranged on each two-force-rod measuring foot structure 2 in an annular distribution mode, 4 forces in the x, y and z directions can be obtained through the distribution of the 4 two-force-rod measuring foot structures 2, and 12 forces can be output in total, and then several optimal force combinations can be selected from 4 Fz, 4 Fx and 4 Fy through experimental data acquisition and optimization algorithms for resolving the disturbance force of a vibration source, so that the resolved disturbance force is the minimum with an actual vibration error, and the calculation formula is as follows:

F(ω)＝D(ω)V(ω)；

the formula is a formula for solving the spatial six-dimensional force, and D (ω) needs to be calibrated through experiments, when calibration is performed, F (ω) and V (ω) are known, F (ω) is the input spatial six-dimensional force, V (ω) is the selected 6 channel outputs (greater than six or possibly, but a system error may be introduced), there are 12 redundant output forces, the accuracy of solving by selecting different 6 channel combinations is different, and the judgment criteria of the accuracy are as follows: and F (omega) obtained by substituting the obtained D (omega) and V (omega) into an equation has the minimum error with the original input force, then the outputs of the 6 channels are in the optimal combination, and the outputs of the six channels are used for solving the six-dimensional force.

The invention provides a two-force rod measuring foot structure and a moment measuring platform, which mainly comprise an object placing table and 4 two-force rod measuring foot structures. The two-force rod measuring foot structure comprises a loading block, a spherical hinge bearing, a measuring unit, a base and an overload protection structure; the 4 two-force rod measuring foot structures are fixedly connected with the object placing table; the loading block is connected with the object placing table, and 3 spherical hinge bearings are fixedly connected to the loading block; the 3 spherical hinge bearings are respectively connected with one ends of the 3 measuring units through threads, and the base is also provided with the 3 spherical hinge bearings which are used for being connected with the other ends of the measuring units; the overload protection structure is fixedly connected to the base; the 4 two-force rods are used for measuring the structure of the foot to support the object placing table, so that the load capacity of the object placing table is improved; by arranging the measuring units which are vertical to each other, the coupling among the force dimensions is reduced, and the measuring precision of the moment measuring platform is improved; by replacing different two-force rod measuring units, the measuring requirements of high and low frequency vibration sources can be met, and the testing capability of the platform is widened; the thin plate is designed on the strain type two-force rod measuring unit, the mounting position of the strain gauge is set to be an area where the two-force rod measuring unit deforms most when being subjected to axial force, in addition, a Wheatstone full-bridge circuit is used for carrying out subsequent processing, and the measuring sensitivity of the platform is improved; through experiments and optimization algorithms, some optimal forces are selected from the redundant 12 output forces of the platform and used for resolving the disturbance vibration force of the vibration source, so that the measurement precision of the platform is improved; the overload protection structure is arranged, so that the measurement safety of the test platform is ensured.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

The above embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A two-force rod measurement foot structure, comprising:

the top surface of the loading block is provided with at least one first positioning hole;

the rotating mechanism comprises a first rotating structure and a second rotating structure, and the first rotating structure is arranged on the bottom surface of the loading block;

the base is arranged below the loading block, and the second rotating structure is arranged on the top surface of the base;

and the measuring unit is made of elastic materials and is arranged between the first rotating structure and the second rotating structure.

2. The two-force lever measuring foot structure of claim 1, wherein the number of the rotating mechanism and the measuring unit is plural, one rotating mechanism corresponding to one measuring unit, one rotating mechanism comprising one of the first rotating structure and one of the second rotating structure;

the first rotating structures are annularly distributed on the bottom surface of the loading block, and included angles between the adjacent first rotating structures are the same;

and the second rotating structures are annularly distributed on the top surface of the base, and included angles between the adjacent second rotating structures are the same.

3. The two-force bar measurement foot structure of claim 2, wherein the number of the first rotating structure, the second rotating structure and the measurement unit is 3.

4. The two-force pole measurement foot structure of claim 1,

the first rotating structure is a first spherical hinge bearing, the second rotating structure is a second spherical hinge bearing, the measuring unit and the first spherical hinge bearing are locked through a first thread, the measuring unit and the second spherical hinge bearing are locked through a second thread, and the setting directions of the first thread and the second thread are opposite.

5. The two-force rod measurement foot structure according to any one of claims 1 to 4, wherein the measurement unit is a strain gauge measurement unit, 4n strain gauges are arranged on the strain gauge measurement unit, and the 4n strain gauges form a full bridge circuit by 4 strain gauges; n is a positive integer.

6. The two-force rod measurement foot structure according to claim 5, wherein the thickness of the measurement unit is smaller than a preset thickness value, and the shape of the measurement unit is any one of S-shaped, O-shaped or square-shaped.

7. The two-force-rod measuring foot structure according to any one of claims 1 to 4, wherein the measuring unit is a piezoelectric measuring unit, the piezoelectric measuring unit comprises a piezoelectric ceramic, a first clamping block and a second clamping block, and the first clamping block and the second clamping block are respectively arranged on the upper side and the lower side of the piezoelectric ceramic and are used for clamping the piezoelectric ceramic.

8. The two-force rod measuring foot structure according to any one of claims 1 to 4, wherein a limiting groove is further formed in the bottom surface of the loading block; the two-force rod measuring foot structure further comprises:

the overload protection structure comprises a support column and a limiting piece, wherein the support column is arranged on the top surface of the base; the limiting part is arranged in the limiting groove and is in clearance fit with the groove wall of the limiting groove.

9. A torque measurement platform, comprising:

at least two-force pole measurement foot structures, being a two-force pole measurement foot structure according to any one of claims 1 to 8;

and the object placing table is arranged above the more than two-force rod measuring foot structures, and a second positioning hole is formed in the bottom surface of the object placing table at the position corresponding to the first positioning hole.

10. The torque measurement platform of claim 9, wherein the stage is further provided with:

the counter bore penetrates through the object placing table along the thickness direction of the object placing table and is arranged on the bottom surface of the object placing table;

the weight reduction groove is arranged on the bottom surface of the object placing table around the counter bore;

the reinforcing ribs are arranged in the weight reducing grooves and are perpendicular to the bottom surface of the object placing table, and each reinforcing rib is arranged between two different groove walls of the weight reducing grooves along the length direction or between the groove wall of the weight reducing groove and the outer side edge of the counter bore.

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