Three-dimensional pressure dynamic calibration device

Abstract

The present application provides a three-dimensional pressure dynamic calibration device, which belongs to the field of sensor calibration technology. The device includes: a frame, provided with a supporting bottom plate and a supporting top plate; a vertical displacement component, which is inserted into the supporting top plate; a first horizontal displacement component, which is connected to the side of the vertical displacement component facing the supporting bottom plate; a second horizontal displacement component, which is superimposed on the side of the first horizontal displacement component away from the vertical displacement component; a force guide, which is connected to the side of the second horizontal displacement component facing the supporting bottom plate; a three-dimensional force sensor, which is provided on the supporting bottom plate, and a first plane for placing the measured object is provided on the side of the three-dimensional force sensor away from the supporting bottom plate. Under the action of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, the force guide applies three-dimensional calibration pressure in the vertical direction, the first horizontal direction and the second horizontal direction to the measured object, and the three-dimensional force sensor is used to detect the three-dimensional calibration pressure. The present application can meet the measurement and calibration requirements of multi-directional forces.

Description

Technical Field

[0001] The present application relates to the technical field of sensor calibration, and in particular to a three-dimensional pressure dynamic calibration device. Background Art

[0002] In modern industry and scientific research, pressure measurement and calibration of products with pressure sensing functions is a basic and important link. Traditional pressure calibration force platforms are usually one-dimensional force platforms, which are mainly used to test tension or pressure.

[0003] However, with the advancement of manufacturing technology and the development of sensor technology, it has become possible to measure forces in multiple directions simultaneously. For example, a three-dimensional force sensor can measure forces in three directions (usually X, Y, and Z axes) simultaneously. At this time, the traditional pressure calibration force platform can only measure and calibrate pressure in a single direction, and cannot meet the measurement and calibration requirements of multi-dimensional forces. Summary of the invention

[0004] The purpose of this application is to provide a three-dimensional pressure dynamic calibration device to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present application proposes a three-dimensional pressure dynamic calibration device, comprising:

[0006] A frame, provided with a supporting bottom plate and a supporting top plate;

[0007] A vertical displacement assembly is disposed through the support top plate to move in a vertical direction toward or away from the support bottom plate;

[0008] A first horizontal displacement assembly, connected to a side of the vertical displacement assembly facing the supporting base plate, so as to move along a first horizontal direction;

[0009] a second horizontal displacement component, superimposed on a side of the first horizontal displacement component away from the vertical displacement component, so as to move along a second horizontal direction;

[0010] A force guide member connected to a side of the second horizontal displacement assembly facing the supporting base plate;

[0011] A three-dimensional force sensor is arranged on the supporting base plate. A first plane for placing the workpiece under test is provided on the side of the three-dimensional force sensor facing away from the supporting base plate. Under the action of the vertical displacement assembly, the first horizontal displacement assembly and the second horizontal displacement assembly, the force guiding member applies three-dimensional calibration pressure in the vertical direction, the first horizontal direction and the second horizontal direction to the workpiece under test. The three-dimensional force sensor is used to detect the three-dimensional calibration pressure applied to the workpiece under test.

[0012] In some embodiments, the vertical displacement assembly includes:

[0013] A first driving motor, wherein the first driving motor is provided with an output end;

[0014] A first screw rod is inserted through the support top plate, and one end of the first screw rod facing away from the support bottom plate is connected to the output end;

[0015] The push plate is fixedly connected to one end of the first screw rod which is away from the first drive motor, and the first screw rod is used for driving the push plate to move along the vertical direction under the drive of the first drive motor.

[0016] In some embodiments, the first horizontal displacement assembly and the second horizontal displacement assembly respectively include:

[0017] Carrying platform;

[0018] A lower plate, slidably connected to the carrying platform;

[0019] The horizontal driving member is connected to the lower plate and is used to drive the lower plate to move along the first horizontal direction or the second horizontal direction.

[0020] In some embodiments, the horizontal drive member includes:

[0021] A second screw rod is disposed through the bearing platform;

[0022] At least two sliding rods, located on both sides of the second screw rod and parallel to and extending through the bearing platform;

[0023] The second driving motor is used to drive the second screw rod to apply a driving force in a target horizontal direction to the supporting platform, thereby driving the lower plate to move relative to the sliding rod in the opposite direction to the target horizontal direction to apply a tangential force in the opposite direction to the target horizontal direction to the test piece.

[0024] In some embodiments, the first horizontal displacement assembly and the second horizontal displacement assembly respectively further include:

[0025] The front stopper and the rear stopper are protruded at both ends of the bearing platform and the lower plate at intervals along the first horizontal direction or the second horizontal direction. The front stopper and the rear stopper include limit switches for limiting the relative movement of the lower plate.

[0026] In some embodiments, the second drive motor is fixed to one of the front block and the rear block by a motor bracket.

[0027] In some embodiments, a counterweight is fixed to the other of the front block and the rear block to balance the gravity of the second drive motor.

[0028] In some embodiments, the force-conducting member includes a pressure-conducting component that fits the shape of the upper surface of the measured object, and the pressure-conducting component is in abutment with the measured object placed on the first plane.

[0029] In some embodiments, the three-dimensional pressure dynamic calibration device further includes:

[0030] A control unit, the control unit is electrically connected to the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, and is used to control the movement of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component based on a calibration instruction, so that the force guiding member applies three-dimensional calibration pressure in the vertical direction, the first horizontal direction and the second horizontal direction to the measured object under the action of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, and realizes three-dimensional pressure calibration of the measured object based on the output capacitance value of each capacitance node in the measured object.

[0031] In some embodiments, the control unit is electrically connected to the second drive motor and the three-dimensional force sensor, and is used to reduce the current input of the second drive motor when it is determined based on feedback from the three-dimensional force sensor that the first horizontal displacement assembly and the second horizontal displacement assembly reach a critical value of the tangential force.

[0032] Compared with the prior art, the beneficial effects of this application include:

[0033] On the one hand, through the synergistic effect of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, a three-dimensional calibration pressure can be applied to the measured object in the vertical direction, the first horizontal direction and the second horizontal direction at the same time. On the other hand, the three-dimensional calibration pressure is transmitted to the measured object through the force guide, and the three-dimensional force sensor can accurately detect the three-dimensional calibration pressure exerted on the measured object. This direct transmission method reduces the error in the intermediate links and improves the accuracy and stability of measurement and calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0035] Figure 1 This is a schematic diagram of the overall structure of a three-dimensional pressure dynamic calibration device according to an embodiment of the present application;

[0036] Figure 2 An exploded schematic diagram of a frame and a vertical displacement component in a three-dimensional pressure dynamic calibration device according to an embodiment of the present application;

[0037] Figure 3 An exploded schematic diagram of a first horizontal displacement component or a second horizontal displacement component in a three-dimensional pressure dynamic calibration device according to an embodiment of the present application;

[0038] Figure 4 is a structural schematic diagram of an insole calibration device involved in a three-dimensional pressure dynamic calibration device according to an embodiment of the present application;

[0039] Figure 5 It is a structural schematic diagram of a knee joint gasket calibration device involved in a three-dimensional pressure dynamic calibration device according to an embodiment of the present application.

[0040] Explanation of the accompanying drawings: 100, three-dimensional pressure dynamic calibration device; 200, insole calibration device; 300, knee joint gasket calibration device; 1, frame; 11, support bottom plate; 12, support top plate; 13, support column; 2, vertical displacement assembly; 21, first drive motor; 22, first screw rod; 23, push plate; 3, first horizontal displacement assembly; 4, second horizontal displacement assembly; 41, bearing platform; 42, lower plate; 43, horizontal drive member; 431, second screw rod; 432, slide rod; 433, second drive motor; 44, front stopper; 45, rear stopper, 46, motor bracket; 47, counterweight; 5, force guide member; 51, pressure transmission assembly; 6, three-dimensional force sensor. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of this application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] As mentioned above, with the advancement of manufacturing technology and the development of sensor technology, it has become possible to measure pressure in multiple directions simultaneously. For example, a three-dimensional force sensor can measure forces in three directions (usually the X, Y, and Z axis directions) at the same time. At this time, the traditional pressure calibration force platform can only measure force in a single direction and cannot meet the measurement and calibration requirements of multi-directional forces. To this end, the present application proposes a three-dimensional pressure dynamic calibration device that can apply and calibrate pressure in three directions (vertical direction, first horizontal direction, and second horizontal direction) at the same time, overcoming the limitation that the traditional pressure calibration force platform can only measure and calibrate in a single direction.

[0048] like Figures 1 to 3 As shown, a three-dimensional pressure dynamic calibration device 100 is provided, comprising:

[0049] The frame 1 is provided with a supporting bottom plate 11 and a supporting top plate 12;

[0050] A vertical displacement assembly 2 is provided through the support top plate 12 to move in a vertical direction close to or away from the support bottom plate 11;

[0051] A first horizontal displacement assembly 3, connected to a side of the vertical displacement assembly 2 facing the supporting base plate 11, so as to move along a first horizontal direction;

[0052] A second horizontal displacement component 4 is superimposed on a side of the first horizontal displacement component 3 away from the vertical displacement component 2 so as to move along a second horizontal direction;

[0053] A force guide member 5 connected to a side of the second horizontal displacement assembly 4 facing the supporting base plate 11;

[0054] The three-dimensional force sensor 6 is arranged on the supporting base plate 11. The side of the three-dimensional force sensor 6 facing away from the supporting base plate 11 is provided with a first plane for placing the workpiece under test. Under the action of the vertical displacement component 2, the first horizontal displacement component 3 and the second horizontal displacement component 4, the force guiding component 5 applies three-dimensional calibration pressure in the vertical direction, the first horizontal direction and the second horizontal direction to the workpiece under test. The three-dimensional force sensor 6 is used to detect the three-dimensional calibration pressure applied to the workpiece under test.

[0055] In this embodiment, the rack 1 is the basic frame of the entire three-dimensional pressure dynamic calibration device 100, which is used to fix and support all other components and can be made of high-strength metal materials (such as aluminum alloy or steel) to ensure rigidity and stability. The rack 1 includes a support base plate 11 and a support top plate 12, which are connected by multiple support columns 13, wherein the support base plate 11 is used to install the three-dimensional force sensor 6 and carry the test piece, and the support top plate 12 is used to install the vertical displacement component 2. It should be noted that the number of support columns 13 can be adjusted as needed, usually 4 or more, evenly distributed between the support base plate 11 and the support top plate 12. The rack 1 in this embodiment provides a stable structural foundation for the three-dimensional pressure dynamic calibration device 100, reducing the impact of external vibration on the measurement. At the same time, multiple support columns 13 enhance the rigidity of the overall structure to prevent deformation or displacement.

[0056] The vertical displacement component 2 is used to move in the vertical direction (Z axis) and apply a calibrated pressure in the vertical direction. It is directly connected to the first horizontal displacement component 3 and indirectly connected to the second horizontal displacement component 4 and the force guide 5, and can drive the first horizontal displacement component 3, the second horizontal displacement component 4 and the force guide 5 to move in the vertical direction.

[0057] In some embodiments, the vertical displacement assembly 2 includes:

[0058] A first driving motor 21, wherein the first driving motor 21 is provided with an output end;

[0059] A first screw rod 22 is passed through the support top plate 12, and one end of the first screw rod 22 away from the support bottom plate 11 is connected to the output end;

[0060] The push plate 23 is fixedly connected to one end of the first screw rod 22 away from the first drive motor 21 . The first screw rod 22 is used for driving the push plate 23 to move along the vertical direction under the drive of the first drive motor 21 .

[0061] In this embodiment, the first drive motor 21 is the power source of the vertical displacement assembly 2, and is used to drive the first screw rod 22 to rotate, thereby realizing the vertical movement of the push plate 23. The first drive motor 21 can be a stepper motor or a servo motor, which has high precision and high response speed and is suitable for precision control. The first drive motor 21 can also be equipped with a reducer to increase the torque and reduce the speed to ensure smooth operation.

[0062] The first screw rod 22 is a key component for converting the rotational motion of the first drive motor 21 into linear motion, and is used to drive the push plate 23 to move in the vertical direction. A ball screw can be used to reduce friction to improve transmission efficiency and accuracy. The length and diameter of the first screw rod 22 can be determined according to actual needs to ensure sufficient travel and strength.

[0063] The push plate 23 is an actuator of the vertical displacement assembly 2, and is used to carry and transmit vertical force. The push plate 23 can be connected to the first screw rod 22 by a nut, and the nut is fixed on the push plate 23.

[0064] The vertical displacement component 2 in this embodiment realizes high-precision vertical displacement control through the combination of the first drive motor 21, the first screw rod 22 and the push plate 23. Among them, the first drive motor 21 provides a strong driving force to ensure that the push plate 23 can move accurately in the vertical direction. The first screw rod 22 converts the rotational motion of the motor into linear motion, and the design of the ball screw improves the transmission efficiency and accuracy. As an actuator, the push plate 23 can carry and transmit the vertical force to other components below.

[0065] The first horizontal displacement component 3 is connected to the vertical displacement component 2 on one side and can move in the vertical direction together with the vertical displacement component 2. The other side is connected to the second horizontal displacement component 4, and is indirectly connected to the force guiding member 5 through the second horizontal displacement component 4. It can drive the second horizontal displacement component 4 and the force guiding member 5 to move along the first horizontal direction (X-axis) and exert force in the first horizontal direction.

[0066] The second horizontal displacement component 4 is connected to the first horizontal displacement component 3 on one side, and is indirectly connected to the vertical displacement component 2 through the first horizontal displacement component 3, and can move in the vertical direction with the vertical displacement component 2, and move along the first horizontal direction (X axis) with the first horizontal displacement component 3. The other side is connected to the force guide 5, and can drive the force guide 5 to move along the second horizontal direction (Y axis) to apply a force in the second horizontal direction.

[0067] In some embodiments, the first horizontal displacement assembly 3 and the second horizontal displacement assembly 4 respectively include:

[0068] Carrying platform 41;

[0069] A lower plate 42 is slidably connected to the carrying platform 41;

[0070] The horizontal driving member 43 is connected to the lower plate 42 and is used to drive the lower plate 42 to move along the first horizontal direction or the second horizontal direction.

[0071] In this embodiment, the bearing platform 41 of the first horizontal displacement assembly 3 is fixedly connected to the side of the vertical displacement assembly 2 facing the supporting bottom plate 11, that is, fixedly connected to the push plate 23, and is the main supporting structure of the first horizontal displacement assembly 3, and is used to provide a sliding reference surface for the lower plate 42 of the first horizontal displacement assembly 3. The bearing platform 41 of the second horizontal displacement assembly 4 is fixedly connected to the lower plate 42 of the first horizontal displacement assembly 3, and is the main supporting structure of the second horizontal displacement assembly 4, and is used to provide a sliding reference surface for the lower plate 42 of the second horizontal displacement assembly 4. The lower plate 42 is connected to the bearing platform 41 through a slide rail or a slider to move relative to the bearing platform 41 in the horizontal direction.

[0072] The horizontal driving member 43 is a power mechanism for driving the lower plate 42 to move in the horizontal direction. It is connected to the lower plate 42 and can drive the lower plate 42 of the first horizontal displacement assembly 3 to move in the first horizontal direction (X axis) or drive the lower plate 42 of the second horizontal displacement assembly 4 to move in the second horizontal direction (Y axis) through a transmission device (such as a screw, a gear, etc.).

[0073] In some embodiments, the horizontal driving member 43 includes:

[0074] A second screw rod 431 is disposed through the carrying platform 41;

[0075] At least two sliding rods 432 are located on both sides of the second screw rod 431 and are parallelly arranged on the carrying platform 41;

[0076] The second driving motor 433 is used to drive the second screw rod 431 to apply a driving force in a target horizontal direction to the supporting platform 41, thereby driving the lower plate 42 to move relative to the sliding rod 432 in the opposite direction to the target horizontal direction to apply a tangential force in the opposite direction to the target horizontal direction to the test piece.

[0077] In this embodiment, the bearing platform 41 is provided with a guide hole, the second screw rod 431 is provided in the guide hole on the bearing platform 41, and the outer peripheral surface of the second screw rod 431 is provided with a thread to cooperate with the guide hole of the bearing platform 41 through a threaded connection, so as to realize the conversion of the rotational motion of the second drive motor 433 into a driving force in the target horizontal direction of the bearing platform 41. The guide hole in this embodiment not only provides an installation position for the second screw rod 431, but also realizes the conversion of rotational motion to linear motion through threaded cooperation.

[0078] At least two slide bars 432 are located on both sides of the second screw rod 431 and are parallelly arranged through the bearing platform 41 to guide the lower plate 42 to perform a linear motion opposite to the target horizontal direction to ensure its smooth sliding.

[0079] The second drive motor 433 is a power source for driving the second screw rod 431 to rotate, and is connected to the second screw rod 431. The second drive motor 433 can transmit the rotational motion of the second drive motor 433 to the second screw rod 431 through a coupling. The second drive motor 433 can be a planetary reduction motor, and the planetary reduction motor in this embodiment can be a DC motor, and its torque can be directly controlled by current.

[0080] In this embodiment, the second drive motor 433 is started, and the rotational motion is transmitted to the second screw rod 431 through the coupling. The second screw rod 431 rotates, and through the threaded cooperation with the guide hole of the bearing platform 41, the rotational motion is converted into a driving force in the target horizontal direction applied to the bearing platform 41. Therefore, no displacement occurs. This means that the bearing platform 41 remains stationary, and the driving force is transmitted to the second screw rod 431 through the reaction force. The reaction force exerted on the second screw rod 431 is transmitted to the lower plate 42 through its connection with the lower plate 42. Under the action of the driving force of the second screw rod 431, the lower plate 42 moves relative to the target horizontal direction along the sliding rod 432 to apply a tangential force opposite to the target horizontal direction to the measured object.

[0081] In this embodiment, on the one hand, the cooperation between the slide bar 432 and the screw rod ensures the smooth sliding of the lower plate 42 and reduces vibration and impact. On the other hand, through the relative movement of the bearing platform 41 and the lower plate 42, the required tangential force can be accurately applied to the test piece to meet the test requirements.

[0082] In some embodiments, the first horizontal displacement assembly 3 and the second horizontal displacement assembly 4 further include:

[0083] The front stopper 44 and the rear stopper 45 are protruded at both ends of the bearing platform 41 and the lower plate 42 at intervals along the first horizontal direction or the second horizontal direction. The front stopper 44 and the rear stopper 45 include limit switches for limiting the relative movement of the lower plate 42.

[0084] The front block 44 and the rear block 45 are convexly arranged at the two ends of the bearing platform 41 and the lower plate 42 at intervals along the first horizontal direction or the second horizontal direction. It should be noted that the front block and the rear block 45 are directly connected to the lower plate 42, and will follow the lower plate 42 to move relative to the bearing platform 41. There is a gap between the front block and the rear block 45 and the bearing platform 41 in the initial state, which can be a gap of 4mm, for controlling the displacement stroke. A limit switch is installed inside the block, which can detect the relative position between itself and the bearing platform 41 and trigger a stop signal by physical contact or photoelectric sensing. When the limit switch detects that the bearing platform 41 has reached the limit position, it will automatically trigger a stop signal to stop the operation of the second drive motor 433 to prevent the output of the second drive motor 433 from exceeding the critical value.

[0085] In some embodiments, the second drive motor 433 is fixed to one of the front block 44 and the rear block 45 by a motor bracket 46. The motor bracket 46 can be firmly fixed to the block by bolts, welding or other mechanical connection methods to ensure that the motor does not move during operation.

[0086] In some embodiments, the other of the front block 44 and the rear block 45 is fixed with a counterweight 47, which means that if the second drive motor 433 is fixed to the front block 44, the counterweight 47 is fixed to the rear block 45, and vice versa. The setting of the counterweight 47 can balance the gravity of the second drive motor 433, reduce the vibration and shaking of the horizontal displacement component caused by uneven weight during operation, and thus improve the stability and accuracy of the three-dimensional pressure dynamic calibration device 100.

[0087] The force guide member 5 is used to transfer the three-dimensional calibration pressure (such as vertical force and horizontal force) of the vertical displacement component 2, the first horizontal displacement component 3 and the second horizontal displacement component 4 to the measured object.

[0088] In some embodiments, the force-conducting member 5 includes a pressure-conducting component 51 that conforms to the shape of the upper surface of the measured object, ensuring that the three-dimensional calibration pressure can be evenly and effectively transmitted to the measured object. When the pressure-conducting component 51 abuts against the measured object placed on the first plane, good contact surface fit and efficient force transmission can be ensured.

[0089] In addition, the size of the displacement component can also be customized according to the size of the measured object, and the displacement component and the force guide 5 can be replaced through a detachable connector. The force measuring area of ​​the measured object is controlled to be less than 1.5 times the force application area of ​​the displacement component. The size of the displacement component is matched with the size of the measured object, so as to achieve a reasonable proportional relationship between the force measuring area and the force application area, ensure that the applied force can be evenly distributed on the measured object, avoid the problem of uneven force caused by the platform size being too large or too small, and improve the calibration precision and accuracy of the three-dimensional pressure.

[0090] For example, Figure 4 In the insole calibration device 200 shown, the pressure transmission component 51 includes an upper insole splint and a lower insole splint which are separately arranged. The upper insole splint is connected to the side of the second horizontal displacement component 4 facing the support base plate 11, and the upper insole splint is provided with a first plane for applying a three-dimensional calibration pressure to the insole to be measured on the side facing the support base plate 11. The lower insole splint is arranged on the second plane of the three-dimensional force sensor 6 away from the support base plate 11, and the lower insole splint is provided with a third plane for placing the insole to be measured on the side facing the upper insole splint, and a pressure measurement space is formed between the first plane and the third plane.

[0091] For example, Figure 5 The knee joint shim calibration device 300 shown in the figure is a pressure sensing device that can help doctors determine the effect of prosthesis implantation during knee replacement surgery. The knee joint shim is placed on the second plane, and the side of the pressure transmission component 51 facing the knee joint shim is in shape with the upper surface of the knee joint shim.

[0092] In this embodiment, on the one hand, by designing the pressure transmission component 51 to fit the shape of the upper surface of the measured object, it can be ensured that the force is evenly transmitted to the measured object, avoiding measurement errors or damage caused by local uneven force. On the other hand, a good abutment fit can reduce the friction and gap between the contact surfaces, and improve the accuracy and reliability of the calibration results. On the third hand, different pressure transmission components 51 can be customized according to the shape of different measured objects, so that they are suitable for various complex geometric shapes, thereby improving the versatility and flexibility of the three-dimensional pressure dynamic calibration device 100 of this application.

[0093] The three-dimensional force sensor 6 is used to detect the three-dimensional calibration pressure applied to the measured object, so as to realize the three-dimensional pressure calibration and correction of the measured object in combination with the measurement pressure of the measured object.

[0094] The three-dimensional pressure dynamic calibration device 100 proposed in the present application, on the one hand, can simultaneously apply three-dimensional calibration pressure to the measured object in the vertical direction, the first horizontal direction, and the second horizontal direction through the synergistic effect of the vertical displacement component 2, the first horizontal displacement component 3, and the second horizontal displacement component 4. On the other hand, the three-dimensional calibration pressure is transmitted to the measured object through the force guide 5, and the three-dimensional force sensor 6 can accurately detect the three-dimensional calibration pressure exerted on the measured object. This direct transmission method reduces the error of the intermediate links and improves the accuracy and stability of the measurement.

[0095] In addition, in one embodiment, the three-dimensional pressure dynamic calibration device 100 further includes:

[0096] The control unit is electrically connected to the vertical displacement component 2, the first horizontal displacement component 3 and the second horizontal displacement component 4. The control unit receives calibration instructions from the operator or the host computer, such as the displacement component to be started, the range of pressure values ​​to be applied, the start of the calibration program, etc., and controls the movement of the vertical displacement component 2, the first horizontal displacement component 3 and the second horizontal displacement component 4 based on the calibration instructions, so that the force-guiding member 5 applies three-dimensional calibration pressures in the vertical direction, the first horizontal direction and the second horizontal direction to the measured object under the action of the vertical displacement component 2, the first horizontal displacement component 3 and the second horizontal displacement component 4, and realizes the three-dimensional pressure calibration of the measured object based on the sensed pressure value calculated based on the output capacitance value of each capacitor node in the measured object and the reading of the three-dimensional force sensor 6. This embodiment can significantly improve the calibration efficiency and reduce manual intervention and errors through the automatic control of the control unit.

[0097] In some embodiments, the control unit is electrically connected to the second drive motor 433 and the three-dimensional force sensor 6, and is used to reduce the current input of the second drive motor 433 when it is determined based on feedback from the three-dimensional force sensor 6 that the first horizontal displacement assembly 3 and the second horizontal displacement assembly 4 have reached a critical value of the tangential force.

[0098] In this embodiment, the critical value of the tangential force means that the reading of the three-dimensional force sensor 6 no longer increases with the increase of the three-dimensional calibration pressure applied by the horizontal displacement component, but maintains a stable value. The critical value of the tangential force can characterize the critical point where the static friction between the force guide 5 and the measured object changes to sliding friction. The control unit can reduce the driving force of the displacement component, suspend the calibration process, and prevent excessive tangential force from causing damage to the measured object by reducing the current input of the second drive motor 433.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0100] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A three-dimensional pressure dynamic calibration device, characterized in that: The three-dimensional pressure dynamic calibration device comprises: A frame, provided with a supporting bottom plate and a supporting top plate; A vertical displacement assembly is disposed through the support top plate to move in a vertical direction toward or away from the support bottom plate; A first horizontal displacement assembly, connected to a side of the vertical displacement assembly facing the supporting base plate, so as to move along a first horizontal direction; a second horizontal displacement component, superimposed on a side of the first horizontal displacement component away from the vertical displacement component, so as to move along a second horizontal direction; A force guide member connected to a side of the second horizontal displacement assembly facing the supporting base plate; A three-dimensional force sensor is arranged on the supporting base plate. A first plane for placing a measured object is arranged on a side of the three-dimensional force sensor away from the supporting base plate. The force guide member applies a three-dimensional calibration pressure in a vertical direction, a first horizontal direction, and a second horizontal direction to the measured object under the action of the vertical displacement component, the first horizontal displacement component, and the second horizontal displacement component. The three-dimensional force sensor is used to detect the three-dimensional calibration pressure applied to the measured object. Wherein, the first horizontal displacement component and the second horizontal displacement component respectively include: A horizontal driving member is connected to the lower plate, and the horizontal driving member includes a second driving motor, which is used to drive the second screw rod to apply a driving force in the target horizontal direction to the supporting platform, thereby driving the lower plate to move relative to the target horizontal direction along the sliding rod to apply a tangential force in the opposite direction to the target horizontal direction to the measured object.

2. The three-dimensional pressure dynamic calibration device according to claim 1, characterized in that: The vertical displacement assembly comprises: A first driving motor, wherein the first driving motor is provided with an output end; A first screw rod is inserted through the support top plate, and one end of the first screw rod facing away from the support bottom plate is connected to the output end; The push plate is fixedly connected to one end of the first screw rod which is away from the first drive motor, and the first screw rod is used for driving the push plate to move along the vertical direction under the drive of the first drive motor.

3. The three-dimensional pressure dynamic calibration device according to claim 1, characterized in that: The lower plates in the first horizontal displacement assembly and the second horizontal displacement assembly are slidably connected to the bearing platform.

4. The three-dimensional pressure dynamic calibration device according to claim 3, characterized in that: The horizontal driving member also includes: A second screw rod is disposed through the bearing platform; At least two sliding rods are located on both sides of the second screw rod and are parallelly arranged on the bearing platform.

5. The three-dimensional pressure dynamic calibration device according to claim 4, characterized in that: The first horizontal displacement assembly and the second horizontal displacement assembly respectively further include: The front block and the rear block are protruded at both ends of the bearing platform and the lower plate at intervals along the first horizontal direction or the second horizontal direction. The front block and the rear block include limit switches for limiting the relative movement of the lower plate.

6. The three-dimensional pressure dynamic calibration device according to claim 5, characterized in that: The second driving motor is fixed to one of the front block and the rear block by a motor bracket.

7. The three-dimensional pressure dynamic calibration device according to claim 6, characterized in that: A counterweight is fixed to the other of the front block and the rear block to balance the gravity of the second drive motor.

8. The three-dimensional pressure dynamic calibration device according to claim 4, characterized in that: The force-conducting member includes a pressure-conducting component that matches the shape of the upper surface of the measured object, and the pressure-conducting component is in abutment with the measured object placed on the first plane.

9. The three-dimensional pressure dynamic calibration device according to claim 8, characterized in that: The three-dimensional pressure dynamic calibration device also includes: A control unit, the control unit is electrically connected to the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, and is used to control the movement of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component based on a calibration instruction, so that the force guiding member applies three-dimensional calibration pressure in the vertical direction, the first horizontal direction and the second horizontal direction to the measured object under the action of the vertical displacement component, the first horizontal displacement component and the second horizontal displacement component, and realizes three-dimensional pressure calibration of the measured object based on the output capacitance value of each capacitance node in the measured object.

10. The three-dimensional pressure dynamic calibration device according to claim 9, characterized in that: The control unit is electrically connected to the second drive motor and the three-dimensional force sensor, and is used to reduce the current input of the second drive motor when it is determined based on feedback from the three-dimensional force sensor that the first horizontal displacement assembly and the second horizontal displacement assembly reach a critical value of the tangential force.

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