Calibration device and clamping force measuring system

Abstract

The present disclosure discloses a calibration device and a clamping force measuring system, the calibration device is used for calibrating a pressure sensor of a clamping force measuring device, the clamping force measuring device comprises a head die assembly and an adjusting mechanism, the adjusting mechanism comprises a first support, the first support is connected with a first pressure sensor, the calibration device comprises a calibration platform and a calibration clamp, the calibration clamp is arranged on the calibration platform, the calibration platform has a containing cavity therein, the containing cavity is configured to contain part of the adjusting mechanism, the calibration clamp has a first through opening, the first through opening is configured to contain the head die assembly; when the first support moves to a predetermined position along a first direction, a first head die matched with the first support can abut against an inner wall of the first through opening.

Description

Technical Field

[0001] This utility model relates to the field of clamping force testing technology, and more specifically, to a calibration device and a clamping force measurement system. Background Technology

[0002] With the development of technology, head-mounted products such as virtual reality devices, augmented reality devices, mixed reality devices, smart helmets, headphones, smart glasses, and smart straps are becoming increasingly common. To improve user comfort, it is necessary to test the clamping force during wear.

[0003] In existing technologies, head mold components are typically used to simulate the shape of a real human head. The head-mounted device to be tested is then worn on the head mold component, and sensors within the testing device are used to test the clamping force exerted by the head-mounted device on the head mold component.

[0004] However, factors such as transportation conditions, application environment, and improper use by users often lead to a decrease in the accuracy of the sensors in the testing device, which in turn affects the reliability of the clamping force test results. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a new type of calibration device and clamping force measurement system.

[0006] According to one aspect of the present invention, a calibration device is provided for calibrating a pressure sensor of a clamping force measuring device. The clamping force measuring device includes a head mold assembly and an adjustment mechanism. The adjustment mechanism includes a first support member, and a first pressure sensor is connected to the first support member.

[0007] The calibration device includes:

[0008] A calibration platform and a calibration fixture, the calibration fixture being disposed on the calibration platform, the calibration platform having a receiving chamber configured to accommodate a portion of the adjustment mechanism, and the calibration fixture having a first opening configured to accommodate the head mold assembly;

[0009] When the first support moves to a predetermined position along the first direction, the first head mold that cooperates with the first support can abut against the inner wall of the first opening.

[0010] Optionally, the first opening has a first inner wall and a second inner wall opposite to each other along the first direction, the first inner wall being configured to abut against the first head mold, and the second inner wall being configured to abut against a second head mold positioned opposite to the first head mold along the first direction.

[0011] Optionally, the calibration device further includes a positioning element, and the calibration fixture further has a second opening, the second opening being arranged along a second direction with the first opening, the second direction being perpendicular to the first direction, and the positioning element being disposed within the second opening.

[0012] Optionally, along the second direction, the second port is arranged coaxially with the first port;

[0013] And / or, along the second direction, the second port is arranged axially symmetrically with respect to the first port;

[0014] And / or, the shape of the second port is different from the shape of the first port.

[0015] Optionally, the calibration device further includes a positioning rod connected along the first direction to two opposing inner walls of the first opening.

[0016] According to another aspect of the present invention, a clamping force measuring system is provided, comprising a clamping force measuring device and the calibration device, wherein the clamping force measuring device comprises a head mold assembly and an adjustment mechanism;

[0017] The head mold assembly includes a first head mold and a second head mold arranged opposite to each other along the first direction;

[0018] The adjustment mechanism includes a base, a first support member, and a second support member. The first support member and the second support member are respectively disposed on the base and arranged along the first direction. The first support member cooperates with the first head mold, and the second support member cooperates with the second head mold. At least the first support member is connected to a first pressure sensor.

[0019] Optionally, the adjustment mechanism further includes a first driving member and a first transmission member. The first driving member is disposed on the base, the driving end of the first driving member is connected to the first transmission member, and the first support member and the second support member are respectively connected to the first transmission member.

[0020] Driven by the first driving member, the first transmission member can drive the first support member and the second support member to move in opposite directions along the first direction.

[0021] Optionally, the second support member is connected to a second pressure sensor. When the second support member and the first support member move in opposite directions along the first direction to the corresponding predetermined positions, the first head mold and the second head mold respectively abut against the two opposite inner walls of the first opening.

[0022] Optionally, the first head mold is a left head mold, the second head mold is a right head mold, the head mold assembly further includes a front head mold and an upper head mold, the adjustment mechanism further includes a third support member and a fourth support member, the third support member cooperates with the front head mold, the fourth support member cooperates with the upper head mold, and at least the third support member is connected to a third pressure sensor;

[0023] When the third support moves to a predetermined position along the second direction, the front mold abuts against the inner wall of the first opening, and the second direction is perpendicular to the first direction.

[0024] Optionally, the calibration device further includes a positioning element, the calibration fixture further includes a second port, the positioning element is disposed in the second port, the adjustment mechanism further includes a third driving element and a third transmission element, the driving direction of the third driving element is the Z direction, the driving end of the third driving element is connected to the third transmission element, the fourth support element is connected to the third transmission element, and the third transmission element is located inside the positioning element.

[0025] Optionally, the calibration device further includes a positioning rod, which is connected to two opposing inner walls of the first opening along the first direction, and the positioning rod is capable of separating the left head mold, the right head mold and the front head mold.

[0026] Optionally, the adjustment mechanism further includes a first detection element and a first driving element. The first driving element is disposed on the base, and the driving end of the first driving element is connected to the first support element in a transmission manner. The first detection element is configured to detect the displacement value of the first support element, and the first detection element is communicatively connected to the first driving element.

[0027] One technical advantage of the embodiments disclosed herein is that:

[0028] This invention utilizes the fact that when the first support member moves along a first direction to a predetermined position, the first head mold abuts against the inner wall of the first opening, allowing the inner wall of the first opening to be subjected to a certain compressive force from the first support member. At this time, a first pressure sensor connected to the first support member can measure this compressive force, that is, the clamping force between the first head mold and the inner wall of the first opening, and obtain a measured value. This measured value is compared and processed with a known compressive force value to calibrate and standardize the first pressure sensor, thus helping to ensure the reliability of the clamping force test.

[0029] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0031] Figure 1 This is a schematic diagram of a clamping force measurement system according to an embodiment of the present disclosure;

[0032] Figure 2 This is another schematic diagram of a clamping force measurement system according to an embodiment of the present disclosure;

[0033] Figure 3 This is a cross-sectional view of a clamping force measuring system according to an embodiment of the present disclosure;

[0034] Figure 4 This is a schematic diagram of a head mold assembly according to an embodiment of the present disclosure.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Head mold assembly;

[0037] 11. Second head mold; 12. First head mold; 13. Front head mold; 14. Upper head mold;

[0038] 2. Adjust the organizational structure;

[0039] 21. Base; 22. First support member; 23. Third support member; 24. Fourth support member; 25. First transmission member; 26. Third drive member; 27. Third transmission member; 28. Second drive member;

[0040] 3. Calibration device;

[0041] 31. Calibration platform; 32. Calibration fixture; 321. First port; 322. Second port; 33. Positioning component; 34. Positioning rod. Detailed Implementation

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0044] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0045] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0047] This invention provides a calibration device 3 for calibrating the clamping force of a head mold assembly to facilitate subsequent calibration. The head mold assembly 1 includes multiple head molds, such as two, three, four, or even more.

[0048] Specifically, the calibration device is used to calibrate the pressure sensor of the clamping force measuring device. The clamping force measuring device includes a head mold assembly 1 and an adjustment mechanism 2. The adjustment mechanism 2 includes a first support member 22 and a second support member. At least the first support member 22 is connected to a first pressure sensor.

[0049] like Figures 1 to 3 As shown, the calibration device 3 provided in this embodiment of the present invention includes:

[0050] The calibration platform 31 and the calibration fixture 32 are provided on the calibration platform 31. The calibration platform 31 has a receiving chamber that is configured to accommodate part of the adjustment mechanism 2. The calibration fixture 32 has a first opening 321 that is configured to accommodate the head mold assembly 1.

[0051] When the first support member 22 moves to a predetermined position along the first direction, the first head mold 12 that cooperates with the first support member 22 can abut against the inner wall of the first opening 321.

[0052] Specifically, the head model assembly 1 may include a first head model 12 and a second head model 11 arranged opposite to each other along a first direction, i.e., the Y direction in the figure. In this embodiment, the shape and size of the first head model 12 and the second head model 11 are designed according to the actual needs of simulating the head-mounted device. Their surface smoothness, curvature, and other parameters can be set to be similar to those of a real human head to improve the accuracy and reliability of the calibration results.

[0053] The first head mold 12 and the second head mold 11 can be made of high-strength, low-deformation materials, such as aluminum alloy or engineering plastics. These materials have sufficient rigidity and are not easily deformed when subjected to clamping force, thus ensuring the stable transmission and accurate measurement of clamping force during calibration.

[0054] like Figure 4As shown, a first head mold 12 and a second head mold 11 can be joined together to form a human head model contouring structure; as shown... Figure 1 and Figure 2 As shown, the first head mold 12, the second head mold 11, the front head mold 13, and the upper head mold 14 can also be set together to form a human head model contour structure.

[0055] like Figure 3 As shown, the base 21 is the basic support component of the adjustment mechanism 2, which provides a stable mounting platform for the first support member 22 and the second support member. The base 21 can be made of metal plate with a certain thickness, such as stainless steel or carbon steel, to ensure that it has sufficient strength and rigidity to withstand the various forces generated by the first support member 22 during movement without significant deformation or vibration.

[0056] like Figure 3 As shown, the first support member 22 and the second support member are respectively disposed on the base 21 and arranged along the first direction, which is also the Y direction in the figure. The first direction is the arrangement direction of the first head mold 12 and the second head mold 11. This allows the first support member 22 to cooperate with the first head mold 12 and the second support member to cooperate with the second head mold 11, for supporting and driving the head mold assembly 1 to move along the first direction.

[0057] Specifically, a first driving component, which can be a motor or a cylinder, can be provided. The driving end of the first driving component is connected to the first support component 22 for transmission, so that the first driving component can drive the first support component 22 to move in the first direction, thereby realizing the position adjustment of the first head mold 12.

[0058] The first support member 22 may be connected to a first pressure sensor. For example, the first pressure sensor may be embedded in the first support member 22 or installed on the side of the first support member 22 near the first head mold 12. This allows the pressure between the first support member 22 and the first head mold 12 to be measured in real time using the first pressure sensor. This pressure is the clamping force of the first head mold 12.

[0059] like Figures 1 to 3 As shown, the calibration platform 31 is the main body of the calibration device 3, providing stable support for the entire calibration device. The calibration platform 31 can adopt a metal frame structure with a certain thickness, such as a steel frame, to ensure that it has sufficient strength and rigidity to withstand the weight of the adjustment mechanism 2 and the head mold assembly 1, as well as various forces generated during the calibration process.

[0060] The surface of the calibration platform 31 can be flattened and equipped with multiple mounting holes and positioning slots for mounting and fixing the calibration fixture 32 and the adjustment mechanism 2. The bottom of the calibration platform 31 can also be equipped with adjustable feet, which can be adjusted to adjust the level of the calibration platform 31, ensuring that the entire calibration device works in a horizontal state, thereby improving the accuracy of calibration.

[0061] like Figures 1 to 3 As shown, the calibration fixture 32 can be fixed on the calibration platform 31, and part of the adjustment mechanism 2 is located in the receiving cavity of the calibration platform 31, so that the calibration platform 31 can accommodate and protect the relevant structures of the adjustment mechanism 2, which helps to ensure the working reliability of the adjustment mechanism 2. The calibration fixture 32 has a first opening 321, which is used to accommodate the head mold assembly 1.

[0062] The calibration fixture 32 can be made of high-strength, high-hardness materials, such as cemented carbide or ceramic, to ensure that it is not easily deformed or damaged during the calibration process. The shape and size of the first port 321 can be designed according to the shape of the head mold assembly 1. Its shape includes, but is not limited to, circles, rectangles, and ellipses. An appropriate gap is formed between the first port 321 and the head mold assembly 1, so that the head mold assembly 1 can move smoothly within the first port 321, and can also play a certain guiding and positioning role in the movement of the head mold assembly 1.

[0063] When the first support member 22 moves to a predetermined position along the first direction, i.e., the Y direction in the figure, the first head mold 12 abuts against the inner wall of the first opening 321, so that the inner wall of the first opening 321 can be subjected to a certain compressive force from the first support member 22. At this time, the first pressure sensor connected to the first support member 22 can measure this compressive force, i.e., the clamping force between the first head mold 12 and the inner wall of the first opening 321, and obtain the measured value. The measured value is compared and processed with the known compressive force value to calibrate and standardize the first pressure sensor, which helps to ensure the reliability of the clamping force test. In addition, the calibration operation can be repeated multiple times, and the average value of multiple measurement data can be taken to improve the accuracy and reliability of the calibration.

[0064] Thus, the design of the first port 321 of the calibration fixture 32 provides a stable and fixed boundary condition for the calibration of the clamping force. This stable measurement environment reduces the interference of external factors on the calibration of the clamping force, such as vibration and shaking, and further improves the accuracy and repeatability of the calibration.

[0065] The predetermined position of the first support member 22 is also the required adjustment position of the first head mold 12. The inner wall of the first opening 321 is adapted to the first head mold 12 so that the first support member 22 is located in the predetermined position when the two are in contact.

[0066] Optionally, the first opening 321 has a first inner wall and a second inner wall opposite to each other along the first direction, the first inner wall being configured to abut against the first head mold 12, and the second inner wall being configured to abut against a second head mold 11 positioned opposite to the first head mold 12 along the first direction.

[0067] Specifically, it can be configured such that during the process of the first support member 22 driving the first head mold 12 to abut against the first inner wall of the first opening 321, the second head mold 11 always abuts against the second inner wall opposite to the first opening 321. That is, the first head mold 12 moves while the second head mold 11 is fixed, so as to form a unilateral positioning of the head mold assembly 1, avoid abnormalities such as movement displacement of the first support member 22, and thus improve the calibration reliability of the calibration device 3.

[0068] Optionally, the calibration device 3 further includes a positioning element 33, and the calibration fixture 32 further has a second opening 322. The second opening 322 and the first opening 321 are arranged along a second direction, which is perpendicular to the first direction, and the positioning element 33 is disposed in the second opening 322.

[0069] like Figure 1 and Figure 2 As shown, the positioning element 33 is placed within the second port 322, and the second port 322 and the first port 321 are arranged along the second direction, i.e., the X direction in the figure. This design constructs a three-dimensional spatial positioning system. During the clamping force calibration process, when the head mold assembly 1 is placed into the first port 321, the positioning element 33 can constrain the head mold assembly 1 from the second direction. This multi-dimensional positioning method avoids clamping force measurement errors caused by positional offset of the head mold assembly 1 during the measurement process, enabling the clamping force calibration to be based on the accurate position of the head mold assembly 1, thereby improving the accuracy of the measurement results.

[0070] Furthermore, the design of the positioning element 33 in conjunction with the second port 322 provides excellent repeatability. During multiple calibration processes, each time the head mold assembly 1 is placed into the first port 321, the positioning element 33 stably positions it in the same location. This high repeatability ensures good consistency and comparability of multiple measurement results, providing a reliable basis for subsequent data analysis and calibration.

[0071] Furthermore, during the clamping force calibration process, the head mold assembly 1 is subjected to clamping force from the adjustment mechanism 2. The presence of the positioning element 33 can disperse this force, distributing it to different positions of the calibration fixture 32. This force dispersion method reduces stress concentration on the inner wall of the first port 321 and in localized areas of the head mold assembly 1, avoiding structural damage or deformation due to excessive stress, thereby ensuring the stability of the device during the calibration process.

[0072] Optionally, along the second direction, the second opening 322 is arranged coaxially with the first opening 321;

[0073] And / or, along the second direction, the second port 322 is arranged axially symmetrically with the first port 321;

[0074] And / or, the shape of the second port 322 is different from the shape of the first port 321.

[0075] like Figure 1 and Figure 2 As shown, the second port 322 and the first port 321 are arranged coaxially along the second direction, that is, the X direction in the figure, so as to improve the balance and stability of the overall structure of the calibration device 3, and also to facilitate the accurate opening of the second port 322 and the first port 321.

[0076] like Figure 1 and Figure 2 As shown, the second port 322 and the first port 321 are arranged symmetrically along the second direction, that is, the X direction in the figure, so as to improve the overall balance and stability of the calibration device 3 while also improving its aesthetics.

[0077] The shape of the first opening 321 may include, but is not limited to, a circle, a rectangle, a racetrack shape, and an ellipse, so as to adapt to different head mold components 1. Similarly, the shape of the second opening 322 may include, but is not limited to, a circle, a rectangle, a racetrack shape, and an ellipse, so as to adapt to different positioning components 33.

[0078] The shape of the second port 322 can be the same as that of the first port 321 to facilitate the opening of the port on the calibration fixture 32; or the shape of the second port 322 can be different from that of the first port 321 to adapt to different calibration requirements.

[0079] Optionally, the calibration device 3 further includes a positioning rod 34, which is connected to two opposing inner walls of the first opening 321 along the first direction.

[0080] like Figure 2As shown, the positioning rod 34 is connected to the two opposite inner walls of the first opening 321 along the first direction, that is, the Y direction in the figure. On the one hand, it can provide a clear axial positioning reference for the head mold assembly 1 placed in the first opening 321, avoid the clamping force calibration error caused by position deviation, and lay the foundation for subsequent accurate calibration of the clamping force.

[0081] On the other hand, during the clamping force calibration process, the head mold assembly 1 is subjected to clamping forces from the adjustment mechanism 2, and these forces are transmitted to the inner wall of the first port 321 through the head mold assembly 1. The design of the positioning rod 34 can disperse these forces, distributing them to different positions of the first port 321. This force dispersion method reduces local stress concentration on the inner wall of the first port 321, avoiding structural damage or deformation caused by excessive stress, thereby ensuring the stability of the calibration device during the calibration process.

[0082] Furthermore, connecting the positioning rod 34 to the two opposing inner walls of the first opening 321 is equivalent to adding a reinforcing structure within the first opening 321, which also improves the overall rigidity of the calibration device 3. When subjected to external forces, the first opening 321 may deform, affecting the positioning accuracy of the head mold assembly 1 and the calibration results of the clamping force. The positioning rod 34, through its connection to the inner walls, limits the deformation of the inner walls, allowing the first opening 321 to maintain good shape stability and providing a stable measurement environment for the calibration of the clamping force.

[0083] This utility model also provides a clamping force measuring system, including a clamping force measuring device and the above-mentioned calibration device 3, wherein the clamping force measuring device includes a head mold assembly 1 and an adjustment mechanism 2;

[0084] The head mold assembly 1 includes a first head mold 12 and a second head mold 11 arranged opposite to each other along the first direction;

[0085] The adjustment mechanism 2 includes a base 21, a first support member 22, and a second support member. The first support member 22 and the second support member are respectively disposed on the base 21 and arranged along the first direction. The first support member 22 cooperates with the first head mold 12, and the second support member cooperates with the second head mold 11. At least the first support member 22 is connected to a first pressure sensor.

[0086] When the first support member 22 moves to a predetermined position along the first direction, i.e., the Y direction in the figure, the first head mold 12 abuts against the inner wall of the first opening 321, so that the inner wall of the first opening 321 can be subjected to a certain compressive force from the first support member 22. At this time, the first pressure sensor connected to the first support member 22 can measure this compressive force, i.e., the clamping force between the first head mold 12 and the inner wall of the first opening 321, and obtain the measured value. The measured value is compared and processed with the known compressive force value to calibrate and standardize the first pressure sensor, which helps to ensure the reliability of the clamping force test. In addition, the calibration operation can be repeated multiple times, and the average value of multiple measurement data can be taken to improve the accuracy and reliability of the calibration.

[0087] Thus, the design of the first port 321 of the calibration fixture 32 provides a stable and fixed boundary condition for the calibration of the clamping force. This stable measurement environment reduces the interference of external factors on the calibration of the clamping force, such as vibration and shaking, and further improves the accuracy and repeatability of the calibration.

[0088] Among them, head mold assembly 1 can be a two-head mold structure, for example... Figure 4 The first head mold 12 and the second head mold 11 shown are joined together to form a human head model contour structure; it can also be a four-head mold structure, for example... Figure 1 and Figure 2 The first head mold 12, the second head mold 11, the front head mold 13, and the upper head mold 14 shown together form a human head model contour structure, which can all realize the calibration of the corresponding pressure sensors.

[0089] Optionally, the adjustment mechanism 2 further includes a first driving member and a first transmission member 25. The first driving member is disposed on the base 21, and the driving end of the first driving member is connected to the first transmission member 25. The first support member 22 and the second support member are respectively connected to the first transmission member 25.

[0090] Driven by the first driving member, the first transmission member 25 can drive the first support member 22 and the second support member to move in opposite directions along the first direction.

[0091] like Figure 3 As shown, the first driving component can be a servo motor, and the first transmission component 25 is a slide rod connected to the drive end of the servo motor. Under the drive of the servo motor, the slide rod can generate precise linear motion, and drive the first support component 22 and the second support component on it to move together to a preset position.

[0092] Specifically, the first support member 22 and the second support member can move in opposite directions along the first direction by setting the screw direction on the slide rod, so that the first support member 22 and the second support member can move closer to each other or further away from each other, thereby realizing the position adjustment of the left and right head molds.

[0093] Optionally, the second support member is connected to a second pressure sensor. When the second support member and the first support member 22 move in opposite directions along the first direction to the corresponding predetermined positions, the first head mold 12 and the second head mold 11 abut against the two opposite inner walls of the first opening 321.

[0094] Specifically, under the drive of the first driving member, the first transmission member 25 can drive the first support member 22 and the second support member to move in opposite directions along the first direction, so that the first support member 22 and the second support member can move closer to each other or further away from each other, thereby realizing the synchronous adjustment of the positions of the left and right head molds.

[0095] When the first support member 22 moves to the corresponding predetermined position along the first direction, the left head mold abuts against the left inner wall of the first opening 321, so that the left inner wall of the first opening 321 can be subjected to a certain compressive force from the first support member 22. At this time, the first pressure sensor connected to the first support member 22 can measure the compressive force, that is, the clamping force between the left head mold and the left inner wall of the first opening 321, and obtain the measured value. The measured value is compared and processed with the known compressive force value to calibrate and standardize the first pressure sensor, which helps to ensure the reliability of the clamping force test.

[0096] Simultaneously, the second support member moves to the corresponding predetermined position, and the right head mold abuts against the right inner wall of the first opening 321, allowing the right inner wall of the first opening 321 to be subjected to a certain compressive force from the second support member. At this time, the second pressure sensor connected to the second support member can measure this compressive force, that is, the clamping force between the right head mold and the right inner wall of the first opening 321, and obtain the measured value. This measured value is compared and processed with the known compressive force value to calibrate and standardize the second pressure sensor, which helps to ensure the reliability of the clamping force test.

[0097] Optionally, the first head mold 12 is a left head mold, the second head mold 11 is a right head mold, the head mold assembly 1 further includes a front head mold 13 and an upper head mold 14, the adjustment mechanism 2 further includes a third support member 23 and a fourth support member 24, the third support member 23 cooperates with the front head mold 13, the fourth support member 24 cooperates with the upper head mold 14, and at least the third support member 23 is connected to a third pressure sensor;

[0098] When the third support member 23 moves to a predetermined position along the second direction, the front mold 13 abuts against the inner wall of the first opening 321, and the second direction is perpendicular to the first direction.

[0099] like Figure 1 and Figure 2 As shown, the left head mold, right head mold, front head mold 13, and upper head mold 14 together form the human head model contour structure. Among them, the left head mold and right head mold are arranged along the first direction, that is, the left-right direction, that is, the Y direction.

[0100] like Figure 3 As shown, driven by the second drive member 28, the third support member 23 can move along the second direction, i.e., the X direction, and adjust the position of the cooperating front mold 13. When the third support member 23 moves to a predetermined position along the second direction, the front mold 13 abuts against the inner wall of the first opening 321, so that the inner wall of the first opening 321 can be subjected to a certain compressive force by the third support member 23. At this time, the third pressure sensor connected to the third support member 23 can measure the compressive force, i.e., the clamping force between the front mold 13 and the inner wall of the first opening 321, and obtain the measured value. The measured value is compared and processed with the known compressive force value to calibrate and standardize the third pressure sensor, which helps to ensure the reliability of the clamping force test.

[0101] Optionally, the calibration device 3 further includes a positioning element 33, and the calibration fixture 32 further includes a second port 322. The positioning element 33 is disposed in the second port 322. The adjustment mechanism 2 further includes a third driving element 26 and a third transmission element 27. The driving direction of the third driving element 26 is the Z direction. The driving end of the third driving element 26 is connected to the third transmission element 27. The fourth support element 24 is connected to the third transmission element 27, and the third transmission element 27 is located in the positioning element 33.

[0102] like Figure 1 and Figure 2 As shown, the positioning element 33 is placed within the second port 322, which is coaxially arranged with the first port 321 along the second direction. This design constructs a three-dimensional spatial positioning system. During the clamping force calibration process, when the head mold assembly 1 is placed into the first port 321, the positioning element 33 can constrain the head mold assembly 1 from the Z direction, which is perpendicular to the horizontal direction. This multi-dimensional positioning method avoids clamping force measurement errors caused by positional offset of the head mold assembly 1 during measurement, allowing the clamping force calibration to be based on the accurate position of the head mold assembly 1, thereby improving the accuracy of the measurement results.

[0103] Furthermore, the internal space of the positioning member 33 can be used to accommodate and arrange structures such as the third transmission member 27, so as to protect the relevant structures and facilitate the compact arrangement of the adjustment mechanism 2.

[0104] An opening can be made on the side of the positioning member 33 near the head mold assembly 1, through which the fourth support member 24 extends and engages with the upper head mold 14. Driven by the third drive member 26, the third transmission member 27 can drive the fourth support member 24 to move along the Z direction and adjust the position of the engaging upper head mold 14.

[0105] In one embodiment, the calibration device 3 may also include a top frame, which is located above the calibration fixture 32 and can cover the upper mold 14. When the fourth support member 24 moves to a predetermined position along the Z direction, the upper mold 14 abuts against the top frame, allowing the top frame to apply a certain compressive force to the fourth support member 24. At this time, the fourth pressure sensor connected to the fourth support member 24 can measure this compressive force, i.e., the clamping force between the upper mold 14 and the top frame, and obtain a measured value. This measured value is compared and processed with a known compressive force value to calibrate and standardize the fourth pressure sensor, which helps to ensure the reliability of the clamping force test.

[0106] Optionally, the calibration device 3 further includes a positioning rod 34, which is connected to two opposing inner walls of the first opening 321 along the first direction, and the positioning rod 34 can separate the left head mold, the right head mold and the front head mold 13.

[0107] like Figure 3 As shown, the positioning rod 34 is connected to the two opposing inner walls of the first opening 321 along the first direction, that is, the arrangement direction of the left and right head molds. This can provide a clear axial positioning reference for the head mold assembly 1 placed in the first opening 321, avoid the clamping force calibration error caused by position deviation, and lay the foundation for subsequent accurate calibration of the clamping force.

[0108] Furthermore, the positioning rod 34 can also separate the left head mold, right head mold and front head mold 13, so as to avoid interference between the movement of the left and right head molds and the movement of the front head mold 13, thereby ensuring independent and reliable adjustment of the position of the left and right head molds and the position of the front head mold 13.

[0109] Optionally, the adjustment mechanism 2 further includes a first detection element and a first driving element. The first driving element is disposed on the base 21, and the driving end of the first driving element is connected to the first support 22 in a transmission manner. The first detection element is configured to detect the displacement value of the first support 22, and the first detection element is communicatively connected to the first driving element.

[0110] Specifically, driven by the first driving component, the first support component 22 can move along the first direction, thereby adjusting the position of the first head mold 12. The communication connection between the first detection component and the first driving component also enables the adjustment mechanism 2 to achieve intelligent control in the first direction. The operator can preset the target position parameters of the first head mold 12 through an external control system. The adjustment mechanism 2 automatically adjusts the operation of the first driving component based on the displacement information fed back by the first detection component, thus achieving automated adjustment of the position of the first head mold 12. This intelligent control method greatly simplifies the operation process, reduces manual intervention, and improves operational efficiency and accuracy.

[0111] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0112] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A calibration device for calibrating a pressure sensor of a clamping force measuring device, the clamping force measuring device comprising a head mold assembly (1) and an adjustment mechanism (2), the adjustment mechanism (2) comprising a first support member (22), the first support member (22) being connected to a first pressure sensor, characterized in that, The calibration device (3) includes: A calibration platform (31) and a calibration fixture (32) are provided on the calibration platform (31). The calibration platform (31) has a receiving chamber configured to accommodate part of the adjustment mechanism (2). The calibration fixture (32) has a first opening (321) configured to accommodate the head mold assembly (1). When the first support member (22) moves to a predetermined position along the first direction, the first head mold (12) that cooperates with the first support member (22) can abut against the inner wall of the first opening (321).

2. The calibration device according to claim 1, characterized in that, The first opening (321) has a first inner wall and a second inner wall opposite to each other along the first direction. The first inner wall is configured to abut against the first head mold (12), and the second inner wall is configured to abut against the second head mold (11) which is positioned opposite to the first head mold (12) along the first direction.

3. The calibration device according to claim 1, characterized in that, The calibration device (3) further includes a positioning element (33), and the calibration fixture (32) also has a second port (322). The second port (322) and the first port (321) are arranged along a second direction, which is perpendicular to the first direction, and the positioning element (33) is located in the second port (322).

4. The calibration device according to claim 3, characterized in that, Along the second direction, the second opening (322) is arranged coaxially with the first opening (321); And / or, along the second direction, the second opening (322) is arranged axially symmetrically with the first opening (321); And / or, the shape of the second port (322) is different from the shape of the first port (321).

5. The calibration device according to claim 1, characterized in that, The calibration device (3) further includes a positioning rod (34), which is connected to two opposing inner walls of the first opening (321) along the first direction.

6. A clamping force measuring system, characterized in that, It includes a clamping force measuring device and a calibration device (3) as described in any one of claims 1 to 5, wherein the clamping force measuring device includes a head mold assembly (1) and an adjustment mechanism (2); The head mold assembly (1) includes a first head mold (12) and a second head mold (11) arranged opposite to each other along the first direction; The adjustment mechanism (2) includes a base (21), a first support member (22), and a second support member. The first support member (22) and the second support member are respectively disposed on the base (21) and arranged along the first direction. The first support member (22) cooperates with the first head mold (12), and the second support member cooperates with the second head mold (11). At least the first support member (22) is connected to a first pressure sensor.

7. The clamping force measuring system according to claim 6, characterized in that, The adjustment mechanism (2) further includes a first driving member and a first transmission member (25). The first driving member is disposed on the base (21). The driving end of the first driving member is connected to the first transmission member (25) in a transmission manner. The first support member (22) and the second support member are respectively connected to the first transmission member (25). Driven by the first driving member, the first transmission member (25) can drive the first support member (22) and the second support member to move in opposite directions along the first direction.

8. The clamping force measuring system according to claim 7, characterized in that, The second support member is connected to a second pressure sensor. When the second support member and the first support member (22) move in opposite directions along the first direction to the corresponding predetermined positions, the first head mold (12) and the second head mold (11) abut against the two opposite inner walls of the first opening (321).

9. The clamping force measuring system according to claim 6, characterized in that, The first head mold (12) is the left head mold, the second head mold (11) is the right head mold, the head mold assembly (1) further includes a front head mold (13) and an upper head mold (14), the adjustment mechanism (2) further includes a third support member (23) and a fourth support member (24), the third support member (23) cooperates with the front head mold (13), the fourth support member (24) cooperates with the upper head mold (14), and at least the third support member (23) is connected to a third pressure sensor; When the third support member (23) moves to a predetermined position along the second direction, the front mold (13) abuts against the inner wall of the first opening (321), and the second direction is perpendicular to the first direction.

10. The clamping force measuring system according to claim 9, characterized in that, The calibration device (3) further includes a positioning element (33), and the calibration fixture (32) also has a second port (322). The positioning element (33) is located in the second port (322). The adjustment mechanism (2) further includes a third driving element (26) and a third transmission element (27). The driving direction of the third driving element (26) is the Z direction. The driving end of the third driving element (26) is connected to the third transmission element (27). The fourth support element (24) is connected to the third transmission element (27), and the third transmission element (27) is located in the positioning element (33).

11. The clamping force measuring system according to claim 9, characterized in that, The calibration device (3) further includes a positioning rod (34), which is connected to two opposing inner walls of the first opening (321) along the first direction, and the positioning rod (34) can separate the left head mold, the right head mold and the front head mold (13).

12. The clamping force measuring system according to claim 6, characterized in that, The adjustment mechanism (2) further includes a first detection element and a first driving element. The first driving element is disposed on the base (21). The driving end of the first driving element is connected to the first support element (22) in a transmission manner. The first detection element is configured to detect the displacement value of the first support element (22), and the first detection element is communicatively connected to the first driving element.

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