Piezoelectric driving device aging device

Abstract

The invention provides a piezoelectric driving device aging device. The piezoelectric driving device aging device comprises a device clamp, a pressurizing piece and an electrifying assembly, and can realize comprehensive aging test on a piezoelectric driving device under a multi-stress coupling condition. The device clamp comprises a fixed part and a movable part, the piezoelectric driving device is clamped between the fixed part and the movable part, the moving direction of the movable part is consistent with the actual working displacement direction of the piezoelectric driving device, and it is ensured that the mechanical loading direction conforms to the actual stress working condition of the device in the testing process. The pressurizing piece specifically adopts an existing press machine, the output end of the pressurizing piece is in direct driving connection with the movable piece, loading pressure on the piezoelectric driving piece can be adjusted and kept in real time through the controller, and mechanical aging tests under different pressure conditions are achieved. The electrifying assembly comprises a movable electrode and an electrode driving piece, the movable electrode is controlled by displacement of the electrode driving piece to achieve controllable contact and separation with the piezoelectric driving piece electrode, and the electrical aging test is completed while reliable electrical connection is ensured.

Description

Technical Field

[0001] This application belongs to the field of aging device technology, and more specifically, relates to an aging device with piezoelectric drive device. Background Technology

[0002] In practical applications of piezoelectric actuators, long-term service is often required under the combined effects of multiple stresses, including current loads, thermal stress, and mechanical loads. However, current industrial testing methods, such as electrical aging and thermal aging, which rely primarily on single stresses, cannot fully simulate the complex operating conditions of multi-physics coupling in the actual working environment of the devices. The aging test results under these single stress conditions often differ significantly from the actual service performance of the devices, resulting in test data that fails to accurately reflect the reliability of the devices under real-world operating conditions. Summary of the Invention

[0003] The purpose of this application is to provide an aging device for piezoelectric actuators to solve the technical problem of limited aging test conditions for piezoelectric actuators in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] A piezoelectric actuator aging device is provided, comprising:

[0006] The device fixture includes a fixed part and a movable part, and a piezoelectric actuator is clamped between the fixed part and the movable part; the moving direction of the movable part is the same as the driving displacement direction of the piezoelectric actuator.

[0007] A pressure-applying component, drivenly connected to the movable component, is used to apply pressure to the piezoelectric actuator;

[0008] An energized assembly includes a movable electrode and an electrode driver, wherein the movable electrode is mounted on the electrode driver, and the electrode driver is used to drive the movable electrode to be connected or disconnected from the piezoelectric actuator.

[0009] As a further improvement to the above technical solution:

[0010] Optionally, a plurality of piezoelectric actuators may be clamped between the fixed member and the movable member, and each piezoelectric actuator is stacked sequentially along the driving displacement direction.

[0011] Optionally, the piezoelectric actuator aging apparatus includes an insulating sheet disposed between each of the piezoelectric actuators, and / or between the piezoelectric actuator and the device fixture.

[0012] Optionally, the fixing component is a frame-shaped bracket, which includes a top plate, a base, and a vertical pole. The top plate is connected to one end of the vertical pole, and the base is connected to the other end of the vertical pole. The top plate, the base, and the vertical pole enclose a frame-shaped bracket with an installation space, and the piezoelectric actuator is disposed within the installation space.

[0013] Optionally, the movable component is a pressure rod, which is movably inserted into the top plate. One end of the pressure rod extends out of the frame-shaped bracket to contact the pressure member; the other end of the pressure rod extends into the mounting space to abut against the piezoelectric actuator.

[0014] Optionally, the active electrode includes a positive active electrode and a negative active electrode, which are respectively disposed at the positive and negative terminals of the piezoelectric actuator.

[0015] Optionally, the electrode driving component includes a first driving component and a second driving component. The active positive electrode is driven to be connected to the first driving component to drive the active positive electrode to be connected to or disconnected from the positive terminal of the piezoelectric driving device. The active negative electrode is driven to be connected to the second driving component to drive the active negative electrode to be connected to or disconnected from the negative terminal of the piezoelectric driving device.

[0016] Optionally, the piezoelectric actuator aging apparatus includes a heating element for heating the piezoelectric actuator.

[0017] Optionally, the piezoelectric drive device aging device further includes an insulation box, in which the piezoelectric drive device is disposed.

[0018] The beneficial effects of the piezoelectric actuator aging device provided in this application are as follows:

[0019] The piezoelectric actuator aging device provided in this application includes a device fixture, a pressure-applying component, and an energizing assembly, enabling comprehensive aging tests on piezoelectric actuators under multi-stress coupling conditions. The device fixture includes a fixed component and a movable component. The piezoelectric actuator is clamped between the fixed and movable components. The movement direction of the movable component is consistent with the actual working displacement direction of the piezoelectric actuator, ensuring that the mechanical loading direction during testing matches the actual stress condition of the device. The pressure-applying component specifically uses an existing press, whose output end is directly driven and connected to the movable component. A controller can adjust and maintain the loading pressure on the piezoelectric actuator in real time, enabling mechanical aging tests under different pressure conditions. The energizing assembly uses a movable electrode, including a movable electrode and an electrode drive component. The movable electrode achieves controllable contact and separation with the piezoelectric actuator electrode through displacement control of the electrode drive component, completing the electrical aging test while ensuring reliable electrical connection. By coordinating the working sequence of the pressure-applying component and the energizing assembly, this device can achieve synchronous aging tests of the piezoelectric actuator under electro-mechanical coupling, effectively simulating the service environment of the device under actual complex working conditions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional structural schematic diagram of the first piezoelectric actuator aging device provided in this application;

[0022] Figure 2 A partial structural schematic diagram of the first piezoelectric actuator aging device provided in this application;

[0023] Figure 3 A partial structural schematic diagram of the second type of piezoelectric actuator aging device provided in this application;

[0024] Figure 4 This is a cross-sectional structural schematic diagram of the second type of piezoelectric actuator aging device provided in this application;

[0025] Figure 5 A three-dimensional structural schematic diagram of the device fixture provided in this application;

[0026] Figure 6 This is a cross-sectional view of the device fixture provided in this application.

[0027] The following are the labeling elements in the figure:

[0028] 1. Component fixtures; 11. Fasteners;

[0029] 111. Top plate; 112. Base;

[0030] 113. Upright pole; 12. Movable parts;

[0031] 2. Piezoelectric actuators; 3. Pressure-applying components;

[0032] 4. Power-conducting components; 41. Movable positive electrode;

[0033] 42. Active negative electrode; 43. First driving element;

[0034] 44. Second driving component; 5. Insulating sheet;

[0035] 6. Insulated box. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of the present invention.

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0040] like Figure 1 and Figure 2 As shown, this application provides an aging device for piezoelectric actuators, including a device fixture 1, a pressure component 3, and an energizing component 4, which can realize comprehensive aging tests on piezoelectric actuators 2 under multiple stress coupling conditions.

[0041] The device fixture 1 includes a fixed component 11 and a movable component 12. The piezoelectric actuator 2 is clamped between the fixed component 11 and the movable component 12. The moving direction of the movable component 12 is consistent with the actual working displacement direction of the piezoelectric actuator 2, ensuring that the mechanical loading direction during the test matches the actual stress condition of the device. The pressurizing component 3 specifically adopts an existing press, whose output end is directly driven and connected to the movable component 12. The controller can adjust and maintain the loading pressure on the piezoelectric actuator 2 in real time, realizing mechanical aging tests under different pressure conditions. The energizing component 4 adopts a movable electrode, including a movable electrode and an electrode driving component. The movable electrode achieves controllable contact and separation with the electrode of the piezoelectric actuator 2 through the displacement control of the electrode driving component, completing the electrical aging test while ensuring a reliable electrical connection. By coordinating and controlling the working sequence of the pressurizing component 3 and the energizing component 4, this device can realize synchronous aging tests of the piezoelectric actuator 2 under electro-mechanical coupling, effectively simulating the service environment of the device under actual complex working conditions.

[0042] like Figure 5 and Figure 6 As shown in a specific embodiment of this application, the device fixture 1 supports parallel testing of multiple devices. Multiple piezoelectric actuators 2 can be simultaneously clamped between the fixed member 11 and the movable member 12. These piezoelectric actuators 2 are stacked sequentially along their driving displacement direction, so that the mechanical load applied by the pressure member 3 can be uniformly transmitted to each piezoelectric actuator 2, ensuring that all devices under test undergo aging tests under the same pressure conditions. The movable electrode of the energizing component 4 is provided with multiple corresponding energizing pins, which can establish reliable electrical connections with the electrodes of each piezoelectric actuator 2. This parallel testing method significantly improves testing efficiency, and is particularly suitable for quality inspection and reliability assessment of mass-produced piezoelectric actuators 2, while ensuring the consistency of aging test conditions for each device under test.

[0043] like Figure 5 and Figure 6 As shown in one specific embodiment of this application, the piezoelectric actuator aging device is further equipped with an insulating sheet 5. The insulating sheet 5 is made of a high-temperature resistant, high-insulation material. The insulating sheet 5 is arranged between adjacent piezoelectric actuators 2, and / or at the contact interface between the piezoelectric actuator 2 and the device clamp 1. This arrangement effectively prevents electrical short circuits that may occur during parallel testing of multiple devices, while also avoiding electrical interference caused by direct contact between the piezoelectric actuator 2 and the metal clamp. The thickness of the insulating sheet 5 must ensure sufficient insulation strength without significantly attenuating the mechanical load applied by the pressure-applying component 3. In actual testing, the introduction of the insulating sheet 5 also plays a role in uniformly distributing pressure, helping to improve the uniformity of pressure distribution during multi-device testing, thereby ensuring that the stress conditions borne by each piezoelectric actuator 2 are consistent.

[0044] like Figure 5 and Figure 6 As shown in a specific embodiment of this application, the fixing member 11 adopts a frame-shaped support, which includes a top plate 111, a base 112, and a vertical rod 113. The top plate 111 is connected to one end of the vertical rod 113, and the base 112 is connected to the other end of the vertical rod 113. The top plate 111 and the base 112 are arranged in a parallel opposing manner, and the three together form a frame-shaped support with a stable support structure. The interior of this frame-shaped support forms a test space for the installation of the piezoelectric actuator 2. The fixing member 11 can also adapt to the aging test requirements of piezoelectric actuators 2 of different specifications.

[0045] like Figure 5 and Figure 6 As shown, in a specific embodiment of this application, the movable component 12 specifically adopts a pressure rod structure to realize the pressure transmission function. The pressure rod is vertically inserted into the guide hole of the top plate 111 through a sliding fit, ensuring that it maintains stable linear movement during the pressure application process. The upper end of the pressure rod extends to the outside of the frame-shaped bracket, and its end is provided with a contact surface that mates with the output end of the pressure component 3, for directly transmitting the mechanical load generated by the pressure component 3. The lower end of the pressure rod extends into the installation space, and its end face forms a flat pressure surface, which maintains parallel contact with the upper surface of the piezoelectric actuator 2. A linear bearing or wear-resistant bushing is provided between the pressure rod and the top plate 111, which not only ensures smooth movement but also avoids the problem of increased clearance due to long-term use.

[0046] like Figures 1 to 4 As shown, in one specific embodiment of this application, the active electrodes include a positive active electrode 41 and a negative active electrode 42. The two active electrodes are arranged symmetrically, located at the electrode positions on both sides of the piezoelectric actuator 2, and their motion is controlled by an independent electrode driving mechanism. This electrode arrangement not only meets the basic requirements for energized testing but also enables independent control and monitoring of electrodes with different polarities, providing greater flexibility and accuracy to the testing process.

[0047] like Figures 1 to 4As shown, in a specific embodiment of this application, the electrode driving component includes a first driving component 43 and a second driving component 44. A high-precision linear motor is preferably used to achieve precise displacement control of the electrode. The output end of the first driving component 43 is rigidly connected to the movable positive electrode 41. Through program control, the movable positive electrode 41 can be driven to move along a linear trajectory, achieving controllable contact and separation with the positive end of the piezoelectric driving device 2. The second driving component 44 is connected to the movable negative electrode 42 with the same configuration, independently controlling the movement state of the movable negative electrode 42 relative to the negative end of the piezoelectric driving device 2. The two driving components employ a synchronous control strategy to ensure coordinated contact actions between the positive and negative electrodes. Furthermore, the contact timing and pressure parameters of the electrodes can be flexibly adjusted according to test requirements, providing a reliable electrical connection guarantee for electrical aging testing.

[0048] In one specific embodiment of this application, the piezoelectric actuator aging device further integrates a heating element (not shown). This heating element adopts a high-temperature resistant resistance heating element or a ceramic heater structure and is integrated inside the piezoelectric actuator aging device. The heating element achieves precise temperature control through a temperature controller, which can adjust the operating temperature of the piezoelectric actuator 2 within the range of 25°C to 200°C to simulate the thermal stress conditions in actual use environments. This heating element works in conjunction with the pressurizing element 3 and the energizing component 4 to form an aging test environment with multi-physical field coupling of temperature, pressure, and electric field. The arrangement of the heating element must ensure that the piezoelectric actuator 2 is heated uniformly to avoid local overheating. A temperature sensor monitors the surface temperature of the piezoelectric actuator 2 in real time, forming a closed-loop temperature control system to ensure the stability and accuracy of temperature conditions during the test.

[0049] like Figure 1 and Figure 2 As shown, in one specific embodiment of this application, the piezoelectric actuator aging device is further configured with a heat preservation chamber 6, which forms a sealed constant-temperature test chamber inside. The piezoelectric actuator 2 and its associated device fixture 1, pressure component 3, and energizing assembly 4 are all disposed within the test chamber inside the heat preservation chamber 6. Alternatively, as Figure 3 and Figure 4 As shown, only the piezoelectric actuator 2, the device fixture 1, and some of its movable electrodes are placed inside the insulation chamber 6. The insulation chamber 6 integrates a temperature sensor array to monitor the temperature distribution within the test chamber at multiple points. This insulation chamber 6 not only maintains a stable test temperature environment but also effectively blocks external environmental interference, ensuring the accuracy and consistency of temperature conditions during the aging test, thus providing a reliable temperature environment for the thermal aging test of the piezoelectric actuator 2.

[0050] The operation procedure of the piezoelectric driven device aging device of this application is as follows:

[0051] First, the device is assembled. The movable positive electrode 41 and movable negative electrode 42 are respectively installed on the first driving component 43 and the second driving component 44, and these components are placed inside the insulation box 6, while the power supply is located outside the insulation box 6. The movable positive electrode 41 is connected to the positive output terminal of the power supply via a wire, and the movable negative electrode 42 is connected to the negative output terminal of the power supply. The control system causes the first driving component 43 and the second driving component 44 to respectively drive the movable positive electrode 41 and the movable negative electrode 42 to the open state.

[0052] Next, the piezoelectric actuator 2 is clamped. The first insulating sheet 5 is placed on the base 112 of the frame-shaped bracket, and precise positioning is achieved using the limiting groove on the side of the insulating sheet 5 and the guide posts on both sides of the frame-shaped bracket. The piezoelectric actuator 2 to be tested is placed in the positioning groove on the upper surface of the insulating sheet 5, ensuring accurate positioning. The above operation is repeated, stacking the insulating sheets 5 and piezoelectric actuator 2 sequentially until the preset number of tests is reached. Finally, the pressure rod of the movable part 12 is passed through the central positioning hole of the top plate 111, so that its lower end face contacts the upper surface of the uppermost insulating sheet 5, completing the positioning and clamping of the piezoelectric actuator 2.

[0053] The clamped device fixture 1 is placed on the working platform of the pressure component 3 inside the insulation box 6. The position of the pressure head of the pressure component 3 is adjusted by the external press PLC controller to ensure precise alignment with the upper end face of the pressure rod. An appropriate pressure load is set and applied according to the test requirements. The first drive component 43 and the second drive component 44 are controlled to drive the movable positive electrode 41 and the movable negative electrode 42 to form reliable contact with the corresponding electrodes of the piezoelectric drive device 2, thus establishing a complete electrical test circuit.

[0054] The target temperature value of the insulation chamber 6 is set. After the temperature inside the chamber stabilizes, preset electrical signal parameters are applied to the piezoelectric actuator 2 via the power supply to formally begin the multi-stress coupling aging test. During the test, the system monitors and records key data such as temperature, pressure, and electrical parameters in real time.

[0055] After the test, the power output signal is first cut off to stop the heating function of the insulation chamber 6. The control electrode drive separates the movable positive electrode 41 and movable negative electrode 42 from the piezoelectric actuator 2, disconnecting the electrical connection. The pressure head of the press component 3 is slowly raised under the control of the press PLC to release the pressure load. After the internal temperature of the insulation chamber 6 drops to a safe range, the device clamp 1 is removed in sequence, the pressure rod is disassembled, and the insulating sheets 5 and the tested piezoelectric actuator 2 are removed in the reverse order of clamping. The entire operation process ensures the safety of the test and the reliability of the data.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An aging device for a piezoelectric actuator, characterized in that, include: The device fixture (1) includes a fixed part (11) and a movable part (12), and the piezoelectric actuator (2) is clamped between the fixed part (11) and the movable part (12); the moving direction of the movable part (12) is the same as the driving displacement direction of the piezoelectric actuator (2); The pressure member (3) is driven to connect with the movable member (12) and is used to apply pressure to the piezoelectric drive device (2); The energized assembly (4) includes a movable electrode and an electrode drive, wherein the movable electrode is mounted on the electrode drive and the electrode drive is used to drive the movable electrode to be connected or disconnected from the piezoelectric drive device (2).

2. The piezoelectric drive device aging device as described in claim 1, characterized in that, The number of piezoelectric actuators (2) that can be clamped between the fixed member (11) and the movable member (12) is multiple, and each piezoelectric actuator (2) is stacked sequentially along the driving displacement direction.

3. The piezoelectric actuator aging device as described in claim 2, characterized in that, Includes an insulating sheet (5) disposed between each of the piezoelectric actuators (2) and / or between the piezoelectric actuators (2) and the device clamp (1).

4. The piezoelectric drive device aging device as described in claim 1, characterized in that, The fixing member (11) is a frame-shaped support, which includes a top plate (111), a base (112) and a vertical pole (113). The top plate (111) is connected to one end of the vertical pole (113), and the base (112) is connected to the other end of the vertical pole (113). The top plate (111), the base (112) and the vertical pole (113) enclose a frame-shaped support with an installation space. The piezoelectric actuator (2) is located in the installation space.

5. The piezoelectric actuator aging device as described in claim 4, characterized in that, The movable part (12) is a pressure rod, which is movably inserted into the top plate (111). One end of the pressure rod extends out of the frame-shaped bracket to contact the pressure member (3); the other end of the pressure rod extends into the installation space to abut against the piezoelectric drive device (2).

6. The piezoelectric drive device aging device as described in claim 1, characterized in that, The active electrode includes an active positive electrode (41) and an active negative electrode (42), which are respectively located at the positive and negative terminals of the piezoelectric actuator (2).

7. The piezoelectric actuator aging device as described in claim 6, characterized in that, The electrode driving device includes a first driving device (43) and a second driving device (44). The active positive electrode (41) is driven to be connected to the first driving device (43) to drive the active positive electrode (41) to be connected to or disconnected from the positive terminal of the piezoelectric driving device (2). The active negative electrode (42) is driven to be connected to the second driving device (44) to drive the active negative electrode (42) to be connected to or disconnected from the negative terminal of the piezoelectric driving device (2).

8. The piezoelectric actuator aging device as described in claim 1, characterized in that, Includes a heating element for heating the piezoelectric actuator (2).

9. The piezoelectric actuator aging device as described in claim 8, characterized in that, It also includes an insulation box (6), in which the piezoelectric actuator (2) is disposed.

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