A bidirectional load integrated piezoelectric performance testing device

Abstract

The application discloses a bidirectional load integrated piezoelectric performance testing device, which comprises a base, a horizontal tensile load unit, a normal compression load unit, a driving mechanism, a testing unit and a driving control unit; the driving mechanism is used for driving the first lead screw of the horizontal tensile load unit and the transmission rod of the normal compression load unit to rotate; the testing unit is used for being connected with a device to be tensile tested and a device to be pressed tested; and the driving control unit is used for being connected with the testing unit, the driving mechanism, a tensile stress sensor and a pressure sensor. The horizontal tensile load unit can be used for horizontal tensile load testing, the normal compression load unit can be used for vertical normal load testing, and the piezoelectric performance of a novel composite piezoelectric material in the vertical compression and horizontal tensile directions can be comprehensively tested.

Description

Technical Field

[0001] This invention relates to the field of testing equipment, and more specifically to a piezoelectric performance testing device with integrated bidirectional load. Background Technology

[0002] The piezoelectric effect is an electromechanical coupling phenomenon. Materials exhibiting this effect are widely used in electronic devices such as piezoelectric filters, actuators, energy harvesters, and sensors, spanning industrial, military, and medical fields. Mainstream piezoelectric devices are based on traditional inorganic piezoelectric materials, which have poor biocompatibility and high Young's modulus, limiting their application to industrial production and making them difficult to match with wearable and implantable applications. Therefore, the piezoelectric properties of biomaterials have become a current research hotspot. However, considering flexible polymer piezoelectric materials and bioprotein materials as sensitive materials in piezoelectric devices, existing piezoelectric performance testing equipment only supports vertical normal loads in a fixed direction, making it impossible to perform tensile tests on the horizontal characteristics of flexible piezoelectric materials. Summary of the Invention

[0003] To address the above-mentioned problems, this invention proposes a piezoelectric performance testing device with bidirectional load integration.

[0004] The technical solution adopted in this invention is as follows:

[0005] A piezoelectric performance testing device with bidirectional load integration includes a base, a horizontal tensile load unit, a normal compressive load unit, a drive mechanism, a testing unit, and a drive control unit.

[0006] The horizontal tensile load unit includes:

[0007] The first slide rail is mounted on the base;

[0008] The first lead screw is rotatably mounted on the base, and the first lead screw is arranged parallel to the first slide rail;

[0009] A mounting platform, fixed to the base;

[0010] The first fixing member cooperates with the fixing platform to clamp the first end of the tensile test device;

[0011] A movable slide is slidably mounted on the first slide rail. The movable slide has a threaded hole. The first lead screw meshes with the threaded hole of the movable slide. When the first lead screw rotates, it drives the movable slide to move horizontally along the direction of the first slide rail.

[0012] The second fixing member, which cooperates with the movable slide, is used to clamp the second end of the tensile test device;

[0013] A tensile stress sensor, one end of which is fixed to the base, and the other end of which is fixed to the movable slide; and

[0014] The first Faraday cage, fixed on the base, is used to cover the tensile test device;

[0015] The normal compression load unit includes:

[0016] The baffle is fixed to the base;

[0017] A pressure sensor is fixed on the baffle plate, and the pressure sensor is used to attach the device to be pressed for testing.

[0018] The transmission rod is rotatably mounted on the base.

[0019] A speed reducer is mounted on the base, and one end of the transmission rod is connected to the speed reducer;

[0020] An electric actuator, fixed to a base, includes a telescopic rod perpendicular to a baffle and corresponding to a pressure sensor. During testing, the telescopic rod presses against the pressure sensor's test device. The output of a reducer is connected to the electric actuator, and rotation of the transmission rod drives the telescopic rod to extend or retract.

[0021] A second Faraday cage, fixed to the base, is used to cover the pressure sensor;

[0022] The drive mechanism is used to drive the first lead screw and the transmission rod to rotate;

[0023] The test unit is used to connect to the tensile test device and the compression test device;

[0024] The drive control unit is connected to the test unit, drive mechanism, tensile stress sensor, and pressure sensor.

[0025] This application enables horizontal tensile load testing via a horizontal tensile load unit and vertical normal load testing via a normal compression load unit, thus achieving comprehensive testing of the piezoelectric properties of novel composite piezoelectric materials in both vertical compression and horizontal tensile directions.

[0026] The working principle of the horizontal tensile load unit is as follows: the first end of the device to be tested is fixed on the fixed platform by the first fixing member, and the second end of the device to be tested is fixed on the movable slide by the second fixing member. The drive mechanism works to drive the first lead screw to rotate. When the movable slide is driven to reciprocate, it causes the tensile stress sensor to deform, thereby obtaining the relationship between the displacement change and the force change curve.

[0027] The working principle of the normal compression load unit: The drive mechanism drives the transmission rod to rotate. When the electric push rod is driven to reciprocate, the end of the telescopic rod applies the load to the pressure sensor. As the electric push rod displacement changes continuously, the force received by the pressure sensor also changes, forming a displacement-force change, and also indirectly forming a force-piezoelectric change.

[0028] It should be noted that the tensile testing device and the compression testing device can be the same device.

[0029] In one embodiment of the present invention, both the first fixing member and the second fixing member are magnets or have magnets, the first fixing member is magnetically attracted to the fixed platform, and the second fixing member is magnetically attracted to the movable slide.

[0030] The fastener in this application uses magnetic attraction to fix the device, which avoids the irreversible damage to flexible composite materials and devices during testing, compared to existing pressure plate screw fixation, thus preventing subsequent testing and application.

[0031] In one embodiment of the present invention, the first slide rail is a conduit, and the movable slide has a sleeve portion that is sleeved on the conduit.

[0032] In one embodiment of the present invention, the fixed platform has a through hole for the first lead screw to pass through, and the fixed platform is used to limit the movement position of one side of the movable slide.

[0033] In one embodiment of the present invention, both the first Faraday cage and the second Faraday cage are transparent Faraday cages.

[0034] In one embodiment of the present invention, the upper end of the first fixing member, the fixing platform, the second fixing member, and the upper end of the movable slide are located inside the first Faraday cage; the baffle is located inside the second Faraday cage, and one end of the telescopic rod passes through the second Faraday cage.

[0035] In one embodiment of the present invention, one end of the first lead screw has a first gear, one end of the transmission rod has a second gear, and the first lead screw and the transmission rod are arranged parallel to each other.

[0036] The drive mechanism includes:

[0037] The second slide rail is mounted on the base and is perpendicular to the first lead screw.

[0038] A movable seat is slidably mounted on the second slide rail, and the movable seat has a threaded hole;

[0039] A drive motor is fixed on the movable base, and a drive gear is fixed to the output shaft of the drive motor. The drive gear is used to mesh with a first gear or a second gear.

[0040] The second lead screw is rotatably mounted on the base, parallel to the second slide rail, and engages with the threaded hole of the movable seat. When the second lead screw rotates, it drives the movable seat to move horizontally along the direction of the second slide rail.

[0041] Switch the motor, fix it on the base, and use it to drive the second lead screw to rotate;

[0042] The movable seat has a first working position, a second working position and a third working position;

[0043] When the movable seat is in the first working position, the drive gear of the drive motor meshes with the first gear and does not mesh with the second gear, so that the tensile test device can be tested independently.

[0044] When the movable seat is in the second working position, the drive gear of the drive motor meshes with the first gear and the second gear at the same time, which means that the tensile test device and the compression test device can be tested at the same time.

[0045] When the movable seat is in the third working position, the drive gear of the drive motor meshes with the second gear but not with the first gear, allowing the device to be pressed to be tested to be tested independently.

[0046] By switching motors, the position of the moving base can be changed, thereby switching between the first, second, and third working positions. Different operating modes can be selected as needed, making the operation both simple and practical.

[0047] In one embodiment of the present invention, the second slide rail is an anti-detachment groove, the cross-section of the anti-detachment groove is triangular, trapezoidal or dovetail-shaped, and the movable seat has a slider adapted to the anti-detachment groove.

[0048] In one embodiment of the present invention, the testing unit includes an electrometer, which is connected to the drive control unit via a data acquisition card.

[0049] In one embodiment of the present invention, the drive control unit includes a driver, a controller, a power module, and a control panel.

[0050] The beneficial effects of this invention are: this application can perform horizontal tensile load testing through the horizontal tensile load unit and vertical normal load testing through the normal compression load unit, which can realize the comprehensive testing of the piezoelectric properties of the novel composite piezoelectric material in the vertical compression and horizontal tensile directions. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of a piezoelectric performance testing device with integrated bidirectional load.

[0052] Figure 2 yes Figure 1 A schematic diagram after removing the first and second Faraday cages.

[0053] The labels for the attached figures are as follows:

[0054] 1. Base; 2. Horizontal tensile load unit; 21. First slide rail; 22. First lead screw; 221. First gear; 23. Fixed platform; 231. Through hole; 24. First fixing member; 25. Moving slide; 251. Sleeve part; 26. Second fixing member; 27. Tensile stress sensor; 28. First Faraday cage; 3. Normal compression load unit; 31. Baffle; 32. Pressure sensor; 33. Transmission rod; 331. Second gear; 34. Reducer; 35. Electric push rod; 351. Telescopic rod; 36. Second Faraday cage; 4. Drive mechanism; 41. Second slide rail; 42. Moving seat; 43. Drive motor; 431. Drive gear; 44. Second lead screw; 45. Switching motor; 5. Test unit; 61. Driver; 62. Controller; 63. Power module; 64. Control panel; 7. Data acquisition card. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] The present invention will now be described in detail with reference to the accompanying drawings.

[0059] like Figure 1 and 2 As shown, a piezoelectric performance testing device with bidirectional load integration includes a base 1, a horizontal tensile load unit 2, a normal compressive load unit 3, a drive mechanism 4, a testing unit 5, and a drive control unit.

[0060] The horizontal tensile load unit 2 includes:

[0061] The first slide rail 21 is mounted on the base 1;

[0062] The first lead screw 22 is rotatably mounted on the base 1, and the first lead screw is arranged parallel to the first slide rail 21;

[0063] The mounting platform 23 is fixed on the base 1;

[0064] The first fixing member 24, which cooperates with the fixing platform 23, is used to clamp the first end of the tensile test device;

[0065] The movable slide 25 is slidably mounted on the first slide rail 21. The movable slide 25 has a threaded hole. The first lead screw meshes with the threaded hole of the movable slide 25. When the first lead screw rotates, it drives the movable slide 25 to move horizontally along the direction of the first slide rail 21.

[0066] The second fixing member 26, which cooperates with the movable slide 25, is used to clamp the second end of the tensile test device.

[0067] Tensile stress sensor 27, one end of which is fixed to base 1, and the other end of which is fixed to movable slide 25; and

[0068] The first Faraday cage 28 is fixed on the base 1 and is used to cover the tensile test device.

[0069] Normal compression load unit 3 includes:

[0070] Baffle 31 is fixed on base 1;

[0071] Pressure sensor 32 is fixed on baffle 31. Pressure sensor 32 is used to attach the device to be pressed for testing.

[0072] The transmission rod 33 is rotatably mounted on the base 1.

[0073] The reducer 34 is mounted on the base 1, and one end of the transmission rod 33 is connected to the reducer 34;

[0074] An electric push rod 35 is fixed on the base 1. The electric push rod 35 has a telescopic rod 351, which is perpendicular to the baffle 31 and corresponds to the pressure sensor 32. During testing, the telescopic rod 351 is used to press against the test device to be pressed on the pressure sensor 32. The output end of the reducer 34 is connected to the electric push rod 35. When the transmission rod 33 rotates, it drives the telescopic rod 351 of the electric push rod 35 to extend or retract.

[0075] The second Faraday cage 36 is fixed on the base 1 and is used to cover the pressure sensor 32;

[0076] Drive mechanism 4 is used to drive the first lead screw 22 and transmission rod 33 to rotate;

[0077] The test unit 5 is used to connect to the tensile test device and the compressive test device. In this embodiment, the test unit 5 includes an electrometer. The electrometer is connected to the drive control unit through the data acquisition card 7. The data acquisition card 7 can acquire data at a large scale and high frequency, thereby more comprehensively displaying the piezoelectric performance of the device under test.

[0078] The drive control unit is connected to the test unit 5, the drive mechanism 4, the tensile stress sensor 27 and the pressure sensor 32. In this embodiment, the drive control unit includes a driver 61, a controller 62, a power module 63 and a control panel 64.

[0079] This application enables horizontal tensile load testing via the horizontal tensile load unit 2 and vertical normal load testing via the normal compression load unit 3, thus achieving comprehensive testing of the piezoelectric properties of the novel composite piezoelectric material in both vertical compression and horizontal tensile directions.

[0080] The working principle of the horizontal tensile load unit 2 is as follows: the first end of the device to be tested is fixed on the fixed platform 23 by the first fixing member 24, and the second end of the device to be tested is fixed on the movable slide 25 by the second fixing member 26. The drive mechanism 4 works to drive the first lead screw to rotate. When the movable slide 25 is driven to reciprocate, it causes the tensile stress sensor 27 to deform, thereby obtaining the relationship between the displacement change and the force change curve.

[0081] Working principle of normal compression load unit 3: The drive mechanism 4 drives the transmission rod 33 to rotate. When the electric push rod 35 is driven to reciprocate, the end of the telescopic rod 351 applies the load to the pressure sensor 32. As the electric push rod displacement changes, the force received by the pressure sensor 32 also changes, forming a displacement-force change, and also indirectly forming a force-piezoelectric change.

[0082] It should be noted that the tensile testing device and the compression testing device can be the same device.

[0083] In this embodiment, both the first fixing member 24 and the second fixing member 26 are magnets or have magnets. The first fixing member 24 is magnetically attracted to the fixed platform 23, and the second fixing member 26 is magnetically attracted to the movable slide 25.

[0084] The fastener in this application uses magnetic attraction to fix the device, which avoids the irreversible damage to flexible composite materials and devices during testing, compared to existing pressure plate screw fixation, thus preventing subsequent testing and application.

[0085] In this embodiment, the first slide rail 21 is a conduit, and the movable slide 25 has a sleeve portion 251 that is sleeved on the conduit.

[0086] In this embodiment, the fixed platform 23 has a through hole 231 for the first lead screw to pass through, and the fixed platform 23 is used to limit the movement position of one side of the movable slide 25.

[0087] In this embodiment, both the first Faraday cage 28 and the second Faraday cage 36 are transparent Faraday cages.

[0088] In this embodiment, the upper ends of the first fixing member 24, the fixing platform 23, the second fixing member 26, and the movable slide 25 are located inside the first Faraday cage 28; the baffle 31 is located inside the second Faraday cage 36, and one end of the telescopic rod 351 is inserted into the second Faraday cage 36.

[0089] In this embodiment, one end of the first lead screw has a first gear 221, and one end of the transmission rod 33 has a second gear 331. The first lead screw and the transmission rod 33 are arranged in parallel.

[0090] Drive mechanism 4 includes:

[0091] The second slide rail 41 is mounted on the base 1 and is perpendicular to the first lead screw.

[0092] The movable seat 42 is slidably mounted on the second slide rail 41, and the movable seat 42 has a threaded hole.

[0093] A drive motor 43 is fixed on a movable base 42. A drive gear 431 is fixed on the output shaft of the drive motor 43. The drive gear 431 is used to mesh with the first gear 221 or the second gear 331.

[0094] The second lead screw 44 is rotatably mounted on the base 1. The second lead screw is parallel to the second slide rail 41 and engages with the threaded hole of the movable seat 42. When the second lead screw rotates, it drives the movable seat 42 to move horizontally along the direction of the second slide rail 41.

[0095] Switch motor 45, fixed on base 1, is used to drive the second lead screw to rotate;

[0096] The movable seat 42 has a first working position, a second working position and a third working position;

[0097] When the movable seat 42 is in the first working position, the drive gear 431 of the drive motor 43 meshes with the first gear 221 and does not mesh with the second gear 331, so that the tensile test device can be tested independently.

[0098] When the movable seat 42 is in the second working position, the drive gear 431 of the drive motor 43 meshes with the first gear 221 and the second gear 331 at the same time, so that the tensile test device and the press test device can be tested at the same time.

[0099] When the movable seat 42 is in the third working position, the drive gear 431 of the drive motor 43 meshes with the second gear 331 but not with the first gear 221, so that the device to be pressed can be tested independently.

[0100] By switching motor 45, the position of the moving base 42 can be changed, thereby realizing the switching between the first working position, the second working position and the third working position. Different operating modes can be selected as needed, making the operation simple and practical.

[0101] In this embodiment, the second slide rail 41 is an anti-detachment groove, the cross-section of which is triangular, trapezoidal, or dovetail-shaped, and the movable seat 42 has a slider that is adapted to the anti-detachment groove.

[0102] The method of using the bidirectional load-integrated piezoelectric performance testing device in this embodiment:

[0103] When performing a horizontal tensile load test on the test device (the device to be stretched), the distance between the moving slide 25 and the fixed stage 23 needs to be manually adjusted according to the length of the device to be stretched. Then, the two ends of the test device are clamped and fixed by magnetic attraction of the first fixing member 24 and the second fixing member 26. The test connector of the electrometer of the test module is connected to the lead wire of the test device, and the first Faraday cage 28 is closed. The drive mechanism 4 is controlled by the control panel 64 to make the moving seat 42 in the first working position before the test is performed.

[0104] When performing a normal compression load test on the test device (the test device to be pressed), the test device needs to be attached to the surface of the pressure sensor 32 with double-sided tape, and then wrapped with aluminum foil to prevent interference from triboelectric signals. Connect the electrometer to the lead extending from the test device, and ensure that the second Faraday cage 36 is closed. Control the drive mechanism 4 to work through the control panel 64, and then perform the test after the moving seat 42 is in the third working position.

[0105] When performing horizontal tensile load test and normal compressive load test on the two test devices respectively, the installation steps of the test devices are the same as those described above. After the two test devices are installed, the drive mechanism 4 is controlled by the control panel 64 to make the moving seat 42 in the second working position, and then the test is performed.

[0106] like Figure 1 and 2 As shown, the bidirectional load-integrated piezoelectric performance testing device of this embodiment features high integration, reasonable wiring, no exposed wire ends, and high safety. It not only fills the gap in horizontal tensile load testing of flexible materials but also boasts high integration and extremely simple operation. This device can be applied not only to research on novel composite materials but also to the industrial production of experimental testing equipment.

[0107] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present invention.

Claims

1. A piezoelectric performance testing device with integrated bidirectional load, characterized in that, It includes a base, a horizontal tensile load unit, a normal compressive load unit, a drive mechanism, a test unit, and a drive control unit; The horizontal tensile load unit includes: The first slide rail is mounted on the base; The first lead screw is rotatably mounted on the base, and the first lead screw is arranged parallel to the first slide rail; A mounting platform, fixed to the base; The first fixing member cooperates with the fixing platform to clamp the first end of the tensile test device; A movable slide is slidably mounted on the first slide rail. The movable slide has a threaded hole, and the first lead screw meshes with the threaded hole of the movable slide. When the first lead screw rotates, it drives the movable slide to move horizontally along the direction of the first slide rail. The second fixing member, which cooperates with the movable slide, is used to clamp the second end of the tensile test device; A tensile stress sensor, one end of which is fixed to the base, and the other end of which is fixed to the movable slide; and The first Faraday cage, fixed on the base, is used to cover the tensile test device and provide electromagnetic shielding; The normal compression load unit includes: The baffle is fixed to the base. A pressure sensor is fixed on the baffle plate, and the pressure sensor is used to attach the device to be pressed for testing. The transmission rod is rotatably mounted on the base. A speed reducer is mounted on the base, and one end of the transmission rod is connected to the speed reducer; An electric actuator, fixed to a base, includes a telescopic rod perpendicular to a baffle and corresponding to a pressure sensor. During testing, the telescopic rod presses against the pressure sensor's test device. The output of a reducer is connected to the electric actuator, and rotation of the transmission rod drives the telescopic rod to extend or retract. A second Faraday cage, fixed to the base, is used to cover the pressure sensor and provide electromagnetic shielding; The drive mechanism is used to drive the first lead screw and the transmission rod to rotate; The test unit is used to connect to the tensile test device and the compression test device; The drive control unit is connected to the test unit, drive mechanism, tensile stress sensor, and pressure sensor; One end of the first lead screw has a first gear, and one end of the transmission rod has a second gear. The first lead screw and the transmission rod are arranged parallel to each other. The drive mechanism includes: The second slide rail is mounted on the base and is perpendicular to the first lead screw. A movable seat is slidably mounted on the second slide rail, and the movable seat has a threaded hole; A drive motor is fixed on the movable base, and a drive gear is fixed to the output shaft of the drive motor. The drive gear is used to mesh with a first gear or a second gear. The second lead screw is rotatably mounted on the base and is parallel to the second slide rail. The second lead screw engages with a threaded hole in the movable seat, and when the second lead screw rotates, it drives the movable seat to move horizontally along the direction of the second slide rail. Switch the motor, which is fixed on the base, to drive the second lead screw to rotate; The movable seat has a first working position, a second working position and a third working position; When the movable seat is in the first working position, the drive gear of the drive motor meshes with the first gear but not with the second gear; When the movable seat is in the second working position, the drive gear of the drive motor meshes with both the first gear and the second gear simultaneously; When the movable seat is in the third working position, the drive gear of the drive motor meshes with the second gear but not with the first gear.

2. The piezoelectric performance testing device with integrated bidirectional load as described in claim 1, characterized in that, Both the first fixing member and the second fixing member are magnets or have magnets. The first fixing member is magnetically attracted to the fixed platform, and the second fixing member is magnetically attracted to the movable slide.

3. The piezoelectric performance testing device with integrated bidirectional load as described in claim 2, characterized in that, The first slide rail is a conduit, and the movable slide has a sleeve portion that is sleeved on the conduit.

4. The piezoelectric performance testing device with integrated bidirectional load as described in claim 2, characterized in that, The fixed platform has a through hole for the first lead screw to pass through, and the fixed platform is used to limit the movement position of one side of the movable slide.

5. The piezoelectric performance testing device with integrated bidirectional load as described in claim 1, characterized in that, Both the first and second Faraday cages are transparent Faraday cages.

6. The piezoelectric performance testing device with integrated bidirectional load as described in claim 1, characterized in that, The first fixing member, the upper end of the fixing platform, the second fixing member, and the upper end of the movable slide are located inside the first Faraday cage; the baffle is located inside the second Faraday cage, and one end of the telescopic rod passes through the second Faraday cage.

7. The piezoelectric performance testing device with integrated bidirectional load as described in claim 1, characterized in that, The second slide rail is an anti-detachment groove, the cross-section of which is triangular, trapezoidal, or dovetail-shaped, and the movable seat has a slider that is adapted to the anti-detachment groove.

8. The piezoelectric performance testing device with integrated bidirectional load as described in claim 1, characterized in that, The testing unit includes an electrometer, which is connected to the drive control unit via a data acquisition card.

9. The piezoelectric performance testing device with integrated bidirectional load as described in claim 8, characterized in that, The drive control unit includes a driver, a controller, a power module, and a control panel.

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