Piezoelectric material comprehensive electrical property detection system

Abstract

This invention relates to the field of piezoelectric material electrical performance testing technology, and discloses a comprehensive electrical performance testing system for piezoelectric materials. The system includes a frame, a testing mechanism, a static pressure application mechanism, and a dynamic force application mechanism. The testing mechanism includes a first electrode, a second electrode, multiple testing components, and a switching component. The first and second electrodes are spaced apart. The switching component connects the first electrode, the second electrode, and the multiple testing components, and is used to switch different testing components to connect to the first and second electrodes to test different electrical properties of the piezoelectric material. The static pressure application mechanism connects the first electrode and the frame, and is used to apply static pressure to the piezoelectric material via the first electrode. The dynamic force application mechanism connects the second electrode and the frame, and is used to apply dynamic force to the piezoelectric material via the second electrode. This comprehensive electrical performance testing system for piezoelectric materials can test multiple electrical properties of piezoelectric materials.

Description

Technical Field

[0001] This invention relates to the field of comprehensive electrical performance testing technology for piezoelectric materials, and in particular to a comprehensive electrical performance testing system for piezoelectric materials. Background Technology

[0002] The electrical performance testing of piezoelectric materials mainly includes the measurement of the piezoelectric constant, which is a linear response coefficient reflecting the coupling between mechanical and electrical quantities. By testing, the electrical characteristics of the material can be revealed, providing an important reference for the performance evaluation and application of the material.

[0003] CN104502737A discloses a piezoelectric strain constant measuring device based on direct dynamic force measurement, comprising a sample loading head, a static load measuring unit, a dynamic force driving source, a dynamic force sensor, a dual-channel charge amplifier, and a data acquisition unit. The sample loading head is used to load the piezoelectric material to be tested; the static load measuring unit is located above the sample loading head and connected to it; the dynamic force driving source is located below the sample loading head; the dynamic force sensor is located between the sample loading head and the dynamic force driving source, with one end connected to the sample loading head and the other end connected to the dynamic force driving source; the dual-channel charge amplifier is connected to the dynamic force sensor and is also used to connect to the piezoelectric material to be tested; the data acquisition unit is connected to the dual-channel charge amplifier. The piezoelectric material to be tested is fixed on the sample loading head, and a static load is applied to the piezoelectric material. The dynamic force sensor located between the sample loading head and the dynamic force driving source, as well as the piezoelectric material to be tested, are connected to a charge amplifier, and the charge amplifier is connected to a data acquisition unit. The dynamic force driving source is driven. The magnitude of the dynamic force and the magnitude of the output charge of the piezoelectric material to be tested are obtained based on the data output by the data acquisition unit. The piezoelectric strain constant of the piezoelectric material to be tested is obtained based on the ratio of the charge to the dynamic force.

[0004] When testing piezoelectric materials using the aforementioned device, since the device only contains equipment related to the piezoelectric strain constant, it can only test the piezoelectric strain constant of the piezoelectric material, resulting in a single testing function. Summary of the Invention

[0005] In view of this, it is necessary to provide a comprehensive electrical performance testing system for piezoelectric materials to solve the technical problem that existing piezoelectric material testing devices can only test the piezoelectric strain constant of piezoelectric materials.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a comprehensive electrical performance testing system for piezoelectric materials, comprising:

[0007] frame;

[0008] The testing mechanism includes a first electrode, a second electrode, multiple testing components, and a switching component. The first electrode and the second electrode are spaced apart. The switching component connects the first electrode, the second electrode, and the multiple testing components and is used to switch different testing components to connect to the first electrode and the second electrode in order to test different electrical properties of the piezoelectric material.

[0009] A static pressure application mechanism, connected to the first electrode and the frame, is used to apply static pressure to the piezoelectric material via the first electrode; and

[0010] A dynamic force application mechanism, connected to the second electrode and the frame, is used to apply a dynamic force to the piezoelectric material via the second electrode.

[0011] In one embodiment, the piezoelectric material comprehensive electrical performance testing system further includes a heating mechanism connected to the frame and covering the first and second electrodes. The heating mechanism is used to heat the piezoelectric material to control its temperature.

[0012] In one embodiment, the dynamic force application mechanism includes a dynamic force sensor, a fixed component, a movable component, a permanent magnet, an excitation coil, and a power supply. The fixed component is connected to the frame, the movable component is slidably disposed on the fixed component and connected to the second electrode via the dynamic force sensor, the permanent magnet is connected to the frame, the excitation coil is connected to the movable component and magnetically connected to the permanent magnet, and the power supply is connected to the excitation coil to output a drive electrical signal to the excitation coil.

[0013] In one embodiment, the power supply can output electrical signals of different magnitudes and frequencies to the excitation coil, thereby adjusting the frequency and magnitude of the dynamic force output by the excitation coil.

[0014] In one embodiment, the dynamic force application mechanism has two excitation coils, which are spaced apart and connected to the moving part. The power supply is connected to the two excitation coils respectively and can individually control the electrical signal output to each excitation coil.

[0015] In one embodiment, the dynamic force application mechanism further includes at least one first spring plate, which connects the fixed member and the movable member, and is used to provide an elastic force for the movable member to reset after movement.

[0016] In one embodiment, the first spring includes a fixing ring and two elastic pieces. The fixing ring is sleeved on the movable member, and the two elastic pieces are respectively disposed on both sides of the fixing ring. Both ends of the elastic pieces are connected to the fixing ring.

[0017] The dynamic force application mechanism further includes at least two connecting parts, each of which is connected to the fixing member and respectively connected to one side of the two elastic sheets.

[0018] In one embodiment, the end of the elastic sheet gradually increases in size along the direction close to the fixing ring, two elastic sheets are symmetrically arranged on both sides of the fixing ring, and the ends of the two elastic sheets and the fixing ring together form a fixing groove and a fixing hole. The size of the fixing groove gradually decreases along the direction close to the fixing ring, the fixing hole is connected to the fixing groove, and the size of the connection between the fixing hole and the fixing groove is smaller than the diameter of the fixing hole.

[0019] In one embodiment, the dynamic force application mechanism further includes a magnetic core connected to the permanent magnet, the movable member being slidably sleeved on the magnetic core, and two excitation coils being spaced apart along the sliding direction of the movable member.

[0020] In one embodiment, the dynamic force application mechanism further includes a second spring sheet connected to the second electrode and the fixing member, and the stiffness of the second spring sheet is greater than that of the first spring sheet. The dynamic force sensor is connected to the second spring sheet and connected to the second electrode via the second spring sheet.

[0021] Compared with the prior art, the beneficial effects of the present invention include: specifically, when testing the electrical properties of piezoelectric materials, the piezoelectric material is placed between the first electrode and the second electrode, a static load force is applied to the piezoelectric material through a static pressure application mechanism, and then a dynamic force of varying magnitude is applied to the piezoelectric material through a dynamic force application mechanism to test the electrical properties of the piezoelectric material under dynamic force; by setting multiple detection components, when it is necessary to measure different electrical properties of the piezoelectric material, different measurement components are switched to be connected to the first electrode and the second electrode through a switching component, so as to measure different electrical properties of the same piezoelectric material through different measurement components, achieving multiple measurements with a single device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a piezoelectric material comprehensive electrical performance testing system according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the testing mechanism in the piezoelectric material comprehensive electrical performance testing system according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the dynamic force application mechanism in the piezoelectric material comprehensive electrical performance testing system according to an embodiment of the present invention;

[0025] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle;

[0026] Figure 5 This is a schematic diagram of the structure of the first spring in the piezoelectric material comprehensive electrical performance testing system according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the moving part, the fixed ring, the first spring, and the excitation coil in the piezoelectric material comprehensive electrical performance testing system according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] Rack 1;

[0030] Testing agency 2;

[0031] First electrode 21;

[0032] Second electrode 22;

[0033] Detection component 23;

[0034] Switch component 24;

[0035] Electromagnetic relay 241;

[0036] Static pressure application mechanism 3;

[0037] Dynamic force application mechanism 4

[0038] Dynamic force sensor 41;

[0039] Fastener 42;

[0040] Casing 421;

[0041] Fixed block 422;

[0042] Item 43;

[0043] Retaining ring 43a;

[0044] Permanent magnet 44;

[0045] Excitation coil 45;

[0046] First fragment 46;

[0047] Retaining ring 461;

[0048] Elastic sheet 462;

[0049] Fixed slot 462a;

[0050] Fixing hole 462b;

[0051] Magnetic core 47;

[0052] Connecting part 48;

[0053] Second fragment 49;

[0054] Heating mechanism 5. Detailed Implementation

[0055] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0056] like Figure 1 and Figure 2 As shown, the present invention provides a comprehensive electrical performance testing system for piezoelectric materials, including a frame 1, a testing mechanism 2, a static pressure application mechanism 3, and a dynamic force application mechanism 4. The testing mechanism 2 includes a first electrode 21, a second electrode 22, multiple testing components 23, and a switching component 24. The first electrode 21 and the second electrode 22 are spaced apart. The switching component 24 connects the first electrode 21, the second electrode 22, and the multiple testing components 23, and is used to switch different testing components 23 to connect the first electrode 21 and the second electrode 22 to test different electrical properties of the piezoelectric material. The static pressure application mechanism 3 connects the first electrode 21 and the frame 1, and is used to apply static pressure to the piezoelectric material through the first electrode 21. The dynamic force application mechanism 4 connects the second electrode 22 and the frame 1, and is used to apply dynamic force to the piezoelectric material through the second electrode 22.

[0057] Specifically, when testing the electrical properties of piezoelectric materials, the piezoelectric material is placed between the first electrode 21 and the second electrode 22. A static load force is applied to the piezoelectric material through the static pressure application mechanism 3, and then a dynamic force of varying magnitude is applied to the piezoelectric material through the dynamic force application mechanism 4 to test the electrical properties of the piezoelectric material under dynamic force. By setting multiple detection components 23, when it is necessary to measure different electrical properties of the piezoelectric material, different measurement components are switched to be connected to the first electrode 21 and the second electrode 22 through the switching component 24, so that different electrical properties of the same piezoelectric material can be measured through different measurement components, and multiple measurements can be performed on a single device.

[0058] It should be understood that the detection component 23 can be a piezoelectric constant detection device, dielectric response detection device, frequency response detection device, dynamic resistance detection device, pyroelectric coefficient detection device, etc., and there may be at least two different types of detection devices among the multiple detection components 23; the number of detection components 23 among the multiple detection components 23 can be two, three, four, or five, etc. Figure 2 As shown, in one embodiment, the number of detection components 23 is four.

[0059] It should be understood that the static pressure application mechanism 3 can be a cylinder, a hydraulic cylinder, a motor-driven lead screw and nut, etc.

[0060] It should be understood that the switching component 24 can be a mechanical switch, an electromagnetic switch, a solid-state relay, etc. Specifically, such as... Figure 2 As shown, in one embodiment, each detection component 23 is connected to the first electrode 21 and the second electrode 22 via a line, and the switching component 24 includes a plurality of electromagnetic relays 241, which are respectively disposed on the connection lines between the plurality of detection components 23 and the first electrode 21 and the second electrode 22.

[0061] By setting multiple electromagnetic relays 241, the on / off connection between different detection components 23 and the first electrode 21 and the second electrode 22 can be controlled, and the detection components 23 can be switched quickly.

[0062] like Figure 1 As shown, in one embodiment, the piezoelectric material comprehensive electrical performance testing system further includes a heating mechanism 5, which is connected to the frame 1 and covers the first electrode 21 and the second electrode 22. The heating mechanism 5 is used to heat the piezoelectric material to control the temperature of the piezoelectric material.

[0063] By setting up the heating mechanism 5, the heating structure can heat the piezoelectric material located between the first electrode 21 and the second electrode 22 to test the electrical properties of the piezoelectric material under different temperatures and dynamic forces. Secondly, during the heating process, the piezoelectric material will have different electrical properties at different temperatures, and the properties of the piezoelectric material will change after being treated at high temperatures. It needs to be treated before it can be measured again. In this application, the heating structure, the switching mechanism and multiple measuring components are combined to measure the various electrical properties of the piezoelectric material at different temperatures when the piezoelectric material is heated.

[0064] It should be understood that the heating component can be a heating furnace with an openable opening on one side, or the heating component can be a heating furnace that can be raised and lowered relative to the first electrode 21 and the second electrode 22.

[0065] It should be understood that the dynamic force application mechanism 4 can be an electric vibration table, an electromagnetic exciter, a servo loading system, etc. For example... Figure 3 and Figure 4 and Figure 6As shown, in one embodiment, the dynamic force application mechanism 4 includes a dynamic force sensor 41, a fixed member 42, a movable member 43, a permanent magnet 44, an excitation coil 45, and a power supply (not shown in the figure). The fixed member 42 is connected to the frame 1. The movable member 43 is slidably disposed on the fixed member 42 and connected to the second electrode 22 via the dynamic force sensor 41. The permanent magnet 44 is connected to the frame 1. The excitation coil 45 is connected to the movable member 43 and is magnetically connected to the permanent magnet 44. The power supply is connected to the excitation coil 45 and is used to output a drive electrical signal to the excitation coil 45.

[0066] When a dynamic load force needs to be applied to the piezoelectric material through the dynamic force application mechanism 4, the power supply outputs an electrical signal to the excitation coil 45. The excitation coil 45 generates a magnetic field, which interacts with the permanent magnet 44 to generate a magnetic force. This magnetic force drives the moving part 43 to move up and down, thereby realizing the application of dynamic force to the piezoelectric material. By setting a dynamic force sensor 41, the dynamic force sensor 41 can detect the dynamic force applied to the piezoelectric material and feed it back to the power supply, forming a closed-loop control to more accurately control the dynamic force applied to the piezoelectric material.

[0067] In one embodiment, the power supply can output electrical signals of different magnitudes and frequencies to the excitation coil 45, so as to adjust the frequency and magnitude of the dynamic force output by the excitation coil 45.

[0068] By outputting electrical signals of different frequencies to the excitation coil 45 through the power supply, the excitation coil 45 can generate excitation forces of different frequencies, and the piezoelectric material can be tested by excitation forces of different frequencies. By outputting electrical signals of different magnitudes to the excitation coil 45, the excitation coil 45 can output dynamic forces of different magnitudes and amplitudes, thereby increasing and enriching the test scenarios.

[0069] It should be understood that the power supply can be a power supply that uses PWM (Pulse Width Modulation) regulation, a power supply that uses an adjustable capacitor to change the frequency of the output current, or a power supply with a frequency converter to adjust the frequency and magnitude of the output current.

[0070] like Figure 4 and Figure 6 As shown, in one embodiment, the dynamic force application mechanism 4 has two excitation coils 45. The two excitation coils 45 are spaced apart and are both connected to the movable part 43. The power supply is connected to the two excitation coils 45 respectively, and the electrical signal output to each excitation coil 45 can be controlled individually.

[0071] By setting two excitation coils 45, the spacing between them allows for force distribution and balance. When both coils operate simultaneously, their excitation forces can be superimposed or complementary, providing a more stable and uniform excitation effect. This design helps reduce excitation force fluctuations caused by the instability or failure of a single coil. Even if one coil fails, the other coil can still maintain a certain excitation function, ensuring the continuity and reliability of the system. By adjusting the relative position and parameters of the two coils, the vibration characteristics of the exciter can be optimized. For example, the phase difference between the coils can be adjusted to control the frequency, amplitude, and waveform of the vibration, thereby better meeting specific application requirements.

[0072] like Figure 4 As shown, in one embodiment, the dynamic force application mechanism 4 further includes at least one first spring plate 46, which connects the fixing member 42 and the movable member 43, and is used to provide the elastic force for the movable member 43 to reset after movement.

[0073] By setting the first spring plate 46, when the excitation coil 45 outputs dynamic force, the excitation coil 45 drives the movable part 43 to move. The movable part 43 drives the first spring plate 46 to deform. The deformed first spring plate 46 has a restoring elastic force, which drives the moved movable part 43 to reset. The presence of the first spring plate 46 can quickly respond to the dynamic changes of the excitation coil 45, helping the excitation coil 45 and the movable part 43 to quickly return to the initial position or the predetermined working state. This rapid response helps to reduce the system delay time and improve the overall working efficiency of the exciter. The use of the first spring plate 46 can reduce energy loss and performance degradation caused by mechanical friction and wear, and extend the service life and reliability of the mechanism. As an elastic element, the mechanical characteristics of the first spring plate 46 can be flexibly adjusted and optimized according to actual needs, so that the dynamic force application mechanism 4 can adapt to different working scenarios and load requirements.

[0074] It should be understood that the material of the first shrapnel 46 can be spring steel, thin steel sheet, etc.

[0075] It should be understood that the number of first spring pieces 46 can be one, two, or three, etc. In one embodiment, the number of first spring pieces 46 is two, and the two first spring pieces 46 are spaced apart at both ends of the movable member 43 along the sliding direction.

[0076] By setting two springs, both springs can limit the sliding of the movable part 43, preventing the sliding direction of the movable part 43 from deviating during the sliding process.

[0077] like Figure 4 and Figure 5As shown, in one embodiment, the first spring 46 includes a fixing ring 461 and two elastic pieces 462. The fixing ring 461 is sleeved on the movable member 43, and the two elastic pieces 462 are respectively disposed on both sides of the fixing ring 461. Both ends of the elastic pieces 462 are connected to the fixing ring 461. The dynamic force application mechanism 4 also includes at least two connecting parts 48, which are all connected to the fixing member 42 and respectively connected to one side of the two elastic pieces 462.

[0078] The fixed ring 461 is sleeved on the movable part 43, serving to fix and support it, allowing the elastic piece to deform stably following the movement of the movable part 43. The connection between the movable part 43 and the fixed part 42 is achieved through the connected fixed ring 461 and elastic piece 462, with the elastic piece 462 connected to the movable part 43. By placing the elastic pieces 462 on both sides of the movable part 43, when the movable part 43 moves, the elastic pieces 462 on both sides can provide elastic support and guidance for the movable part 43. Since one side of the elastic piece 462 is fixed to the fixed part 42 by the connecting part 48, when the movable part 43 drives the fixed ring 461 to move, the fixed ring 461 drives the elastic piece 462 to move, causing the elastic piece 462 to deform and have a restoring elastic force. The deformed elastic piece 462 can push the movable part 43 to return to its original position.

[0079] It should be understood that the connecting part 48 can be a bolt, screw, or clip, etc.

[0080] like Figure 5 As shown, in one embodiment, the end of the elastic piece 462 gradually increases in size along the direction close to the fixing ring 461. Two elastic pieces 462 are symmetrically arranged on both sides of the fixing ring 461. The ends of the two elastic pieces 462 and the fixing ring 461 enclose a fixing groove 462a and a fixing hole 462b. The size of the fixing groove 462a gradually decreases along the direction close to the fixing ring 461. The fixing hole 462b is connected to the fixing groove 462a, and the size of the connection between the fixing hole 462b and the fixing groove 462a is smaller than the diameter of the fixing hole 462b.

[0081] By setting the end of the elastic sheet 462 to gradually increase in size along the direction close to the fixed ring 461, the connection strength at the connection between the elastic sheet 462 and the fixed ring 461 can be enhanced, and fatigue failure at the connection between the elastic sheet 462 and the fixed ring 461 can be avoided.

[0082] By setting a fixing groove 462a, the size of the fixing groove 462a gradually increases in the direction away from the fixing ring 461, so that when the elastic piece 462 is stretched by the fixing ring 461, the force-bearing part shifts towards both sides of the fixing ring 461, and the two elastic pieces 462 are symmetrically arranged on both sides of the fixing ring 461, so that the elastic force on both sides of the fixing ring 461 is symmetrical, and the elastic force on both sides deviates from the central symmetry line, which can provide stable support and reset elastic force for the movement of the fixing ring 461, so that the moving part 43 only slides relative to the fixing part 42; by setting a fixing hole 462b, as the size of the elastic piece 462 gradually increases in the direction close to the fixing ring 461, the size of the end of the elastic piece can be extended and the size of the root of the elastic piece 462 can be reduced, which is beneficial to control the deformation position of the elastic piece 462 when it is driven by the fixing ring 461, so that the deformation part of the elastic piece 462 is controlled at the end of the elastic piece 462.

[0083] like Figure 4 As shown, in one embodiment, the dynamic force application mechanism 4 further includes a magnetic core 47, which is connected to a permanent magnet 44. A movable member 43 is slidably sleeved on the magnetic core 47, and two excitation coils 45 are spaced apart along the sliding direction of the movable member 43.

[0084] By connecting the magnetic core 47 to the permanent magnet 44, the magnetic field is guided and enhanced. This strengthens the magnetic field acting on the excitation coil 45 and ensures a uniform distribution of the magnetic field within the mechanism, thereby improving the interaction between the magnetic field and the excitation coil 45. The movable part 43 is slidably fitted onto the magnetic core 47, allowing it to slide stably and precisely under the guidance of the magnetic core 47. By distributing the two excitation coils 45 at intervals along the sliding direction of the movable part 43, the two excitation coils 45, when energized, work together with the magnetic field of the permanent magnet 44 to form a dynamic force. This dynamic force acts on both ends of the sliding direction of the movable part 43, allowing it to slide smoothly onto the magnetic core 47 and respond quickly. It also prevents the force applied by the excitation coils 45 to the movable part 43 from deviating from the axis, enabling the dynamic force application mechanism 4 to more precisely control the movement of the movable part 43.

[0085] Since the movable component 43 is connected to the excitation coil 45, the second electrode 22, and the dynamic force sensor 41, the gravity of the excitation coil 45, the second electrode 22, and the dynamic force sensor 41 all act on the movable component 43. When the excitation coil 45 is energized and drives the movable component 43 to move, it needs to overcome the gravity of the excitation coil 45, the second electrode 22, and the dynamic force sensor 41 before it can drive the movable component 43 to output dynamic force outward. This reduces the sensitivity and response speed of the movable component 43 in outputting dynamic force. Therefore, as Figure 3As shown, in one embodiment, the dynamic force application mechanism 4 further includes a second spring 49, which is connected to the second electrode 22 and the fixing member 42. The stiffness of the second spring 49 is greater than that of the first spring 46. The dynamic force sensor 41 is connected to the second spring 49 and connected to the second electrode 22 via the second spring 49.

[0086] By setting a second spring plate 49, which connects to the fixing member 42 and the second electrode 22, and is connected to the dynamic force sensor 41, the movable member 43 and the excitation coil 45 via the second electrode 22, the second spring plate 49 can counteract and bear the weight of the second electrode 22, the dynamic force sensor 41, the movable member 43 and the excitation coil 45. This allows the excitation coil 45 to quickly drive the movable member 43, the dynamic force sensor 41 and the second electrode 22 to move when energized, thereby increasing the sensitivity and response speed of the dynamic force output by the movable member 43 and the second electrode 22. Secondly, by setting the second spring plate 49, the dynamic force sensor 43 and the second electrode 22 can be connected to the fixing member 42 and the second electrode 22, and the second spring plate 49 can be connected to the dynamic force sensor 41, the movable member 43 and the second electrode 22 via the second electrode 22. If the stiffness of the second spring 49 is set to be greater than that of the first spring 46, it may result in the second spring 49 having a less supportive effect than the first spring 46. Therefore, in this embodiment, the stiffness of the second spring 49 is set to be greater than that of the first spring 46, so that the roles of the second spring 49 and the first spring 46 are distinguished. This allows the elastic force of the second spring 49 to achieve a balance between the gravity of the second electrode 22, the dynamic force sensor 41, the moving part 43, and the excitation coil 45. Meanwhile, the first spring 46 enables the moving part 43 to quickly reset after movement. The two work together to enhance the response speed and sensitivity of the dynamic force output by the second electrode 22.

[0087] It should be understood that the fastener 42 can be various housings, brackets, etc., that can serve a fixing function, such as... Figure 3 and Figure 4 As shown, in one embodiment, the fixing member 42 includes a housing 421 and an annular fixing block 422. The housing 421 is hollow inside, and a through hole is provided on the top of the housing 421. The housing 421 is connected to the frame 1 and is sleeved on the second electrode 22 through the through hole. The dynamic force sensor 41, the movable member 43, and the permanent magnet 44 are sequentially built into the housing 421 in the vertical direction. The fixing block 422 is built into the housing 421 and sleeved on the movable member 43. Two first spring pieces 46 are connected to the fixing block 422 through the connecting part 48 and are disposed at both ends of the fixing block 422. Two fixing rings 43a are provided on the movable member 43. The two fixing rings 43a are disposed at both ends of the movable member 43 and on the side opposite to the two first spring pieces 46. The fixing rings 43a are connected to the movable member 43 and are used to fix the inner ring of the first spring piece 46 to the movable member 43.

[0088] It should be understood that the retaining ring 43a can be fixedly connected to the movable part 43, or it can be fixed to the movable part 43 by means of bolts, screws, clips, adhesives, etc., or it can be connected to the movable part 43 by means of threaded connection.

[0089] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A comprehensive electrical performance testing system for piezoelectric materials, characterized in that, include: frame; The testing mechanism includes a first electrode, a second electrode, multiple testing components, and a switching component. The first electrode and the second electrode are spaced apart. The switching component connects the first electrode, the second electrode, and the multiple testing components and is used to switch different testing components to connect to the first electrode and the second electrode in order to test different electrical properties of the piezoelectric material. A static pressure application mechanism, connected to the first electrode and the frame, is used to apply static pressure to the piezoelectric material via the first electrode; and A dynamic force application mechanism, connected to the second electrode and the frame, is used to apply a dynamic force to the piezoelectric material via the second electrode; The dynamic force application mechanism includes a dynamic force sensor, a fixed component, a movable component, a permanent magnet, an excitation coil, and a power supply. The fixed component is connected to the frame. The movable component is slidably disposed on the fixed component and connected to the second electrode via the dynamic force sensor. The permanent magnet is connected to the frame. The excitation coil is connected to the movable component and is magnetically connected to the permanent magnet. The power supply is connected to the excitation coil and is used to output a drive electrical signal to the excitation coil. The dynamic force application mechanism further includes at least one first spring plate, which connects the fixed member and the movable member and is used to provide the elastic force for the movable member to reset after movement; The first spring includes a fixing ring and two elastic pieces. The fixing ring is sleeved on the movable part, and the two elastic pieces are respectively disposed on both sides of the fixing ring. Both ends of the elastic pieces are connected to the fixing ring. The dynamic force application mechanism further includes at least two connecting parts, each of which is connected to the fixing member and respectively connected to one side of the two elastic sheets; The end of the elastic sheet gradually increases in size along the direction close to the fixing ring. Two elastic sheets are symmetrically arranged on both sides of the fixing ring. The ends of the two elastic sheets and the fixing ring together form a fixing groove and a fixing hole. The size of the fixing groove gradually decreases along the direction close to the fixing ring. The fixing hole is connected to the fixing groove, and the size of the connection between the fixing hole and the fixing groove is smaller than the diameter of the fixing hole.

2. The piezoelectric material comprehensive electrical performance testing system according to claim 1, characterized in that: It also includes a heating mechanism, which is connected to the frame and covers the first and second electrodes. The heating mechanism is used to heat the piezoelectric material to control the temperature of the piezoelectric material.

3. The piezoelectric material comprehensive electrical performance testing system according to claim 1, characterized in that: The power supply can output electrical signals of different magnitudes and frequencies to the excitation coil, thereby adjusting the frequency and magnitude of the dynamic force output by the excitation coil.

4. The piezoelectric material comprehensive electrical performance testing system according to claim 1, characterized in that: The dynamic force application mechanism has two excitation coils, which are spaced apart and connected to the moving part. The power supply is connected to the two excitation coils respectively and can independently control the electrical signal output to each excitation coil.

5. The piezoelectric material comprehensive electrical performance testing system according to claim 4, characterized in that: The dynamic force application mechanism further includes a magnetic core, which is connected to the permanent magnet. The movable part is slidably sleeved on the magnetic core, and the two excitation coils are distributed at intervals along the sliding direction of the movable part.

6. The piezoelectric material comprehensive electrical performance testing system according to claim 1, characterized in that: The dynamic force application mechanism further includes a second spring, which is connected to the second electrode and the fixing member. The stiffness of the second spring is greater than that of the first spring. The dynamic force sensor is connected to the second spring and then connected to the second electrode via the second spring.

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