A multi-component force sensor metrology aid

Abstract

This utility model relates to the field of mechanical metrology technology, specifically a metrology auxiliary device for a multi-component force sensor. It includes an upper fixture and a lower fixture. One end of the upper fixture is connected to the lower fixture, and the other end is suspended, with a gap between them. Both the upper and lower fixtures contain recesses whose inner walls match the shape of the sensor to be tested. The sensor is placed in the upper and lower fixtures through the recesses. The upper fixture includes an X-axis force plate and a Y-axis force plate, and the lower fixture includes a Z-axis force plate. The X-axis and Y-axis force plates each have a blind hole one and a blind hole two, respectively, while the Z-axis force plate has a blind hole three and a blind hole four. All four blind holes are connected to steel balls. This utility model ensures that the force direction of the sensor is consistent with the design direction during metrology, improving calibration reliability and solving the problem in the prior art that multi-component force sensors cannot be stably installed and calibrated directly in force standard machines.

Description

[Technical Field]

[0001] This utility model relates to the field of mechanical measurement technology, specifically a multi-component force sensor measurement auxiliary device. [Background Technology]

[0002] Multi-component force sensors are mostly disc-shaped or cylindrical, which makes them difficult to install stably in force standard machines. Due to the limitations of the force standard machine's own structure, when applying compressive force, the upper and lower pressure plates can usually only guarantee the application of a unidirectional force value vertically.

[0003] Under these conditions, there is a lack of effective control over the direction of force applied to the sensor during calibration. This can easily lead to a deviation between the actual applied force or torque and the design direction, resulting in crosstalk (or interdimensional interference). This interference can severely affect the accuracy and reliability of the calibration results. [Utility Model Content]

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a multi-component force sensor metrology auxiliary device that ensures the force direction of the sensor is consistent with the design direction during metrology, thereby improving calibration reliability and solving the problem that multi-component force sensors cannot be stably installed and calibrated directly in force standard machines in the prior art.

[0005] To achieve the above objectives, a multi-component force sensor measurement auxiliary device is designed, comprising an upper fixture 11 and a lower fixture 12. One end of the upper fixture 11 is connected to the lower fixture 12, and the other end of the upper fixture 11 is suspended, with a gap between it and the lower fixture 12. A recess 2 is provided within both the upper fixture 11 and the lower fixture 12. The inner wall of the recess 2 matches the shape of the sensor 1 to be measured. The sensor 1 to be measured is placed on the upper fixture via the recess 2. In the upper tooling 11 and the lower tooling 12, the upper tooling 11 includes an X-direction force plate 22 and a Y-direction force plate 23, and the lower tooling 12 includes a Z-direction force plate 24. The X-direction force plate 22 and the Y-direction force plate 23 are respectively provided with blind hole 1 25 and blind hole 26, and the Z-direction force plate 24 is provided with blind hole 3 27 and blind hole 4 28. The blind hole 1 25, blind hole 26, blind hole 3 27 and blind hole 4 28 are all connected to the steel ball 29.

[0006] Furthermore, the front part of the sensor under test 1 is provided with through hole 3, through hole 4, through hole 5, and through hole 6. Through hole 3 and through hole 4 are symmetrical vertically, and through hole 5 and through hole 6 are symmetrical horizontally. The rear part of the sensor under test 1 is provided with through hole 7, through hole 8, through hole 9, and through hole 10. Through hole 7 and through hole 10 are symmetrical vertically, and through hole 8 and through hole 9 are symmetrical horizontally. The sensor under test 1 is connected and positioned by the through holes provided in the socket 2 through each through hole and the positioning pin.

[0007] Furthermore, the lower tooling 12 is pre-set with through holes 13, 14, 15, and 16, and the upper tooling 11 is pre-set with through holes 17, 18, 19, and 20. The lower tooling 12 and the upper tooling 11 are connected to the socket 2 through the through holes and positioning pins. The positioning pins are distributed around the socket 2 and point towards the socket 2, thereby ensuring that the clamping force is evenly distributed and avoiding additional errors caused by installation deviations.

[0008] Furthermore, the socket 2 is provided with a stop or positioning pin, and is connected to the sensor under test 1 through the stop or positioning pin, so that the position and orientation of the sensor under test 1 are consistent each time it is installed.

[0009] Furthermore, the X-direction force plate 22 and the Y-direction force plate 23 of the upper tooling 11 are perpendicular to each other and form an L-shape. The rear sides of the X-direction force plate 22 and the Y-direction force plate 23 are connected to a back plate. The bottom and left side of the lower tooling 12 are respectively provided with a bottom plate and a side plate. The bottom plate and the side plate are perpendicular to the Z-direction force plate 24 and form an L-shape.

[0010] Furthermore, the X-direction force plate 22 is connected to the Z-direction force plate 24 and the side plate, and a gap is pre-set between the bottom end of the Y-direction force plate 23 and the base plate, thereby further reserving installation and adjustment space.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] (1) Improve calibration accuracy: This utility model can achieve accurate calibration of force and torque in multiple directions, avoiding measurement errors caused by deviation of the force direction (existing technology can only meet the calibration of force in the X direction. After using this auxiliary calibration device, the calibration of force and torque in other directions can be achieved).

[0013] (2) This utility model connects the sensor and auxiliary equipment with screws, which can ensure a stable connection and ensure the accuracy of the calibration results, while avoiding the safety hazards caused by using other fixing methods for calibration.

[0014] (3) Reduce inter-dimensional interference: This utility model significantly reduces the crosstalk effect between components through precise force transmission path design, thereby improving the accuracy of calibration results.

[0015] (4) Enhanced repeatability and reliability: The sensor installation conditions of this utility model are highly consistent, ensuring that the calibration results have good repeatability and reliability.

[0016] (5) Protecting the sensor: This utility model can avoid accidental damage such as overload and impact caused by improper installation or load offset, and extend the service life of the sensor.

[0017] (6) Significant long-term benefits: This utility model improves calibration efficiency and quality, reduces product development failures or quality accidents caused by calibration errors, and saves time and costs. [Image Description]

[0018] Figure 1 This is a schematic diagram showing the distribution of through holes on the sensor under test of this utility model;

[0019] Figure 2 This is a schematic diagram of the upper and lower tooling of this utility model;

[0020] Figure 3 This is a schematic diagram showing the distribution of through holes on the upper and lower tooling of this utility model;

[0021] Figure 4 This is a schematic diagram of the blind hole distribution and steel ball structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the external structure of this utility model;

[0023] Figure 6 yes Figure 5 A schematic diagram of the front structure;

[0024] Figure 7 yes Figure 5 A schematic diagram of the side structure;

[0025] Figure 8 yes Figure 5 A top-view structural diagram;

[0026] Figure 9 This is a schematic diagram of the internal front structure of this utility model;

[0027] Figure 10 This is a schematic diagram of the internal side structure of this utility model;

[0028] Figure 11 This is a top view of the internal structure of this utility model;

[0029] In the diagram: 1. Sensor under test; 2. Recess; 3. Through hole three; 4. Through hole four; 5. Through hole five; 6. Through hole six; 7. Through hole seven; 8. Through hole eight; 9. Through hole nine; 10. Through hole ten; 11. Upper fixture; 12. Lower fixture; 13. Through hole thirteen; 14. Through hole fourteen; 15. Through hole fifteen; 16. Through hole sixteen; 17. Through hole seventeen; 18. Through hole eighteen; 19. Through hole nineteen; 20. Through hole twentieth; 22. X-direction force plate; 23. Y-direction force plate; 24. Z-direction force plate; 25. Blind hole one; 26. Blind hole two; 27. Blind hole three; 28. Blind hole four; 29. ​​Steel ball. [Detailed Implementation]

[0030] The present invention will be further described below with reference to the accompanying drawings:

[0031] As attached Figure 1 To be continued Figure 11 As shown, this utility model provides a multi-component force sensor measurement auxiliary device, including an upper fixture 11 and a lower fixture 12. One end of the upper fixture 11 is connected to the lower fixture 12, and the other end of the upper fixture 11 is suspended, with a gap between it and the lower fixture 12. A recess 2 is provided inside the upper fixture 11 and the lower fixture 12. The inner wall of the recess 2 matches the shape of the sensor 1 to be measured. The sensor 1 to be measured is placed in the upper fixture 11 and the lower fixture 12 through the recess 2. The upper fixture 11 includes an X-axis force plate 22 and a Y-axis force plate 22. The plate 23 and the lower tooling 12 include a Z-direction force plate 24, an X-direction force plate 22, and a Y-direction force plate 23, which are respectively provided with blind holes 1 25 and 26. The Z-direction force plate 24 is provided with blind holes 3 27 and 4 28. Blind holes 1 25, 26, 3 27, and 4 28 are all connected to steel balls 29. The socket 2 is provided with a stop or positioning pin, and is connected to the sensor under test 1 through the stop or positioning pin, so that the position and orientation height of the sensor under test 1 are consistent each time it is installed.

[0032] The sensor under test 1 has through holes 3, 4, 5, and 6 at its front. Through holes 3 and 4 are vertically symmetrical, and through holes 5 and 6 are horizontally symmetrical. The sensor under test 1 has through holes 7, 8, 9, and 10 at its rear. Through holes 7 and 10 are vertically symmetrical, and through holes 8 and 9 are horizontally symmetrical. The sensor under test 1 is connected to the through holes in the socket 2 through the through holes and positioning pins. Positioning: The lower fixture 12 has pre-set through holes 13, 14, 15, and 16, while the upper fixture 11 has pre-set through holes 17, 18, 19, and 20. The lower fixture 12 and the upper fixture 11 are connected to the socket 2 through the positioning pins in each through hole. The positioning pins are distributed around the socket 2 and point towards the socket 2, which can ensure that the clamping force is evenly distributed and avoid additional errors caused by installation deviation.

[0033] The X-direction force plate 22 and the Y-direction force plate 23 of the upper tooling 11 are perpendicular to each other and form an L-shape. The back plate is connected to the rear side of the X-direction force plate 22 and the Y-direction force plate 23. The bottom and left side of the lower tooling 12 are respectively provided with a bottom plate and a side plate. The bottom plate and the side plate are perpendicular to the Z-direction force plate 24 and form an L-shape. The X-direction force plate 22 is connected to the Z-direction force plate 24 and the side plate. There is a pre-set gap between the bottom end of the Y-direction force plate 23 and the bottom plate, so as to further reserve installation and adjustment space.

[0034] This utility model fixture (multi-component force sensor measurement auxiliary device) is equipped with a recess 2 that precisely matches the shape of the sensor 1 under test. The sensor 1 under test has through holes (see reference numerals 3-10 in the attached drawings). The through hole structure ensures that the sensor 1 under test is accurately positioned during installation. The sensor 1 under test is placed between the upper fixture 11 and the lower fixture 12. The upper fixture 11 has through holes (see reference numerals 13-16 in the attached drawings), and the lower fixture 12 has through holes (see reference numerals 17-20 in the attached drawings). The sensor 1 is connected to the upper and lower fixtures by screwing screws (locating pins 21) into the reserved through holes (see reference numerals 13-20 in the attached drawings). The recess has through holes (same as the through holes of the fixtures), which can be fixed by the locating pins 21 to ensure that the position and orientation of the sensor 1 under test are consistent each time it is installed, avoiding additional errors caused by installation deviations. The upper fixture 11 consists of an X-axis force plate 22 and a Y-axis force plate 23, while the lower fixture 12 consists of a Z-axis force plate 24. Blind holes (labeled 25, 26, 27, and 28 in the attached diagram) are present on the X-axis force plate 22, Y-axis force plate 23, and Z-axis force plate 24, respectively. The torque can be calibrated by placing a steel ball 29 into each blind hole. The position and size of the through holes can be optimized to ensure uniform distribution of clamping force and avoid introducing additional bending moments or eccentric loads. In use, the force standard machine applies force values ​​to the X-axis force plate 22, Y-axis force plate 23, and Z-axis force plate 24 of the fixture to calibrate the linearity related to the force value of the sensor under test 1. Placing the steel ball 29 into the blind holes and applying force values ​​at the standard force points (blind hole one 25, blind hole two 26, blind hole three 27, and blind hole four 28) simulates the torque lever arm and calibrates the linearity related to the sensor torque.

[0035] This invention addresses the problem that existing multi-component force sensors cannot be stably installed and calibrated directly in force standard machines (currently, force value calibration can usually only be achieved in a single direction, such as the Z-axis). It provides a multi-component force sensor calibration auxiliary device, which aims to achieve force and torque calibration in other directions, ensuring that the force direction of the sensor is consistent with the design direction during measurement, thereby improving calibration reliability.

[0036] This invention ensures high calibration accuracy through precise force transmission paths: a dedicated fixture ensures that the applied forces (Fx, Fy, Fz) and torques (Mx, My, Mz) are transmitted to the sensitive parts of the sensor along a pre-defined and accurate path, avoiding interference from component forces or additional torques caused by improper installation. A key challenge for multi-component sensors is "inter-dimensional interference" (or "crosstalk"), where a force in one direction (e.g., Fz) can generate false signals in other directions (e.g., Mx). High-quality sensors compensate for this through structural design and algorithms. The calibration aid, through precise centering and force introduction, ensures that pure forces (e.g., pure tension / compression) or pure torques are applied without accidentally introducing other components, thus minimizing interference at the hardware level and making subsequent calibration matrices more accurate and stable. Avoiding overload and eccentric loads, the calibration aid guides the load precisely to the sensor's designed load area, preventing damage to the sensor due to unexpected lateral forces, bending moments, or torques exceeding the measurement range.

[0037] In this invention, the sensor under test is connected to two fixed fixtures via screws. Its working principle is as follows: a force standard applies a force value to the force plate, which can calibrate the linearity related to the sensor's force value; applying a force value at a standard force point can simulate the lever arm of torque, calibrating the linearity related to the sensor's torque.

[0038] The multi-component force sensor metrological auxiliary device of this utility model achieves precise mechanical coupling between the sensor and the force standard machine through structural design. Specifically, the device features a recess design that precisely matches the shape of the sensor, employing a blind hole or through hole structure to ensure accurate positioning of the sensor during installation. A positioning device is also included: a stop or positioning pin is installed within the recess to ensure consistent sensor position and orientation each time it is installed, preventing additional errors due to installation deviations. Furthermore, a clamping device is employed, with optimized bolt hole positions and sizes to ensure uniform clamping force distribution, avoiding the introduction of additional bending moments or eccentric loads. Finally, an optimized force transmission path is achieved through precise alignment and a force introduction mechanism, ensuring that the applied forces (Fx, Fy, Fz) and torques (Mx, My, Mz) are transmitted to the sensor's sensitive parts along a preset path, minimizing interdimensional interference.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art. The standard parts used can be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0040] This utility model is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this utility model shall be considered equivalent substitutions and shall be included within the protection scope of this utility model.

Claims

1. A multi-component force sensor metrology aid characterized by: The device includes an upper fixture (11) and a lower fixture (12). One end of the upper fixture (11) is connected to the lower fixture (12), and the other end of the upper fixture (11) is suspended and has a gap between it and the lower fixture (12). A recess (2) is provided inside both the upper fixture (11) and the lower fixture (12). The inner wall of the recess (2) matches the shape of the sensor to be tested (1). The sensor to be tested (1) is placed in the upper fixture (11) and the lower fixture (12) through the recess (2). (11) Includes an X-direction force plate (22) and a Y-direction force plate (23). The lower tooling (12) includes a Z-direction force plate (24). The X-direction force plate (22) and the Y-direction force plate (23) are respectively provided with blind hole one (25) and blind hole two (26). The Z-direction force plate (24) is provided with blind hole three (27) and blind hole four (28). The blind hole one (25), blind hole two (26), blind hole three (27), and blind hole four (28) are all connected to the steel ball (29).

2. The multi-component force sensor metering auxiliary device as described in claim 1, characterized in that: The front part of the sensor under test (1) is provided with through hole three (3), through hole four (4), through hole five (5) and through hole six (6). Through hole three (3) and through hole four (4) are symmetrical vertically, and through hole five (5) and through hole six (6) are symmetrical horizontally. The rear part of the sensor under test (1) is provided with through hole seven (7), through hole eight (8), through hole nine (9) and through hole ten (10). Through hole seven (7) and through hole ten (10) are symmetrical vertically, and through hole eight (8) and through hole nine (9) are symmetrical horizontally. The sensor under test (1) is connected to and positioned by the through holes provided in the socket (2) through each through hole and positioning pin.

3. The multi-component force sensor metrology aid of claim 1, wherein: The lower tooling (12) is provided with through holes thirteen (13), fourteen (14), fifteen (15), and sixteen (16), and the upper tooling (11) is provided with through holes seventeen (17), eighteen (18), nineteen (19), and twenty (20). The lower tooling (12) and the upper tooling (11) are connected to the socket (2) through the through holes and the positioning pins. The positioning pins are distributed around the socket (2) and point towards the socket (2).

4. The multi-component force sensor metering auxiliary device as described in claim 1, characterized in that: The socket (2) is provided with a stop or positioning pin, and is connected to the sensor under test (1) through the stop or positioning pin, so that the position and orientation height of the sensor under test (1) are consistent each time it is installed.

5. The multi-component force sensor metering auxiliary device as described in any one of claims 1 to 4, characterized in that: The upper tooling (11) has an X-direction force plate (22) and a Y-direction force plate (23) perpendicularly forming an L-shape. The rear sides of the X-direction force plate (22) and the Y-direction force plate (23) are connected to a back plate. The bottom and left side of the lower tooling (12) are respectively provided with a bottom plate and a side plate. The bottom plate and the side plate are perpendicular to the Z-direction force plate (24) to form an L-shape.

6. The multi-component force sensor metrology aid of claim 5, wherein: The X-direction force plate (22) is connected to the Z-direction force plate (24) and the side plate, and a gap is preset between the bottom end of the Y-direction force plate (23) and the base plate.

Images