Piezoelectric ceramic stack test quick clamping tool

Abstract

The utility model relates to a piezoelectric ceramic stack test quick clamping tool relates to piezoelectric ceramic microdisplacement test auxiliary device technical field, including piezoelectric ceramic installation component and piezoelectric ceramic pressure assembly, piezoelectric ceramic installation component is composed of fixed plate and casing, the inside of casing is equipped with with the placement cavity of piezoelectric ceramic stack is placed, piezoelectric ceramic pressure assembly includes the left pressure plate and right pressure plate of setting at the both sides of casing, piezoelectric ceramic pressure assembly still includes the pressure column of setting in the inside of casing upper end, the outside of pressure column is equipped with the pressure column adapter in the middle position, the upper end of pressure column is equipped with pressure column cap, the top of pressure column cap is equipped with top cover, the both sides of pressure column are equipped with sliding side lever, and one end of sliding side lever is with pressure column screw connection, and the scheme has solved in the microdisplacement measurement field, how efficient, high precision completes piezoelectric ceramic stack elongation test problem.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for testing micro-displacement of piezoelectric ceramics, specifically a quick clamping fixture for testing stacked piezoelectric ceramics. Background Technology

[0002] Actuators based on piezoelectric ceramics utilize the inverse piezoelectric effect to convert electrical energy into mechanical energy. They offer advantages such as high driving force, long service life, and fast response speed, and are widely used in mechanisms such as optical pendulum stages and linear displacement components. Although piezoelectric ceramics can achieve displacements at the micrometer level or above under voltage drive, differences in manufacturing processes and raw material ratios lead to variations in the maximum displacement of different piezoelectric ceramics. Therefore, by measuring the maximum displacement of piezoelectric ceramics and strictly controlling their performance, driving accuracy can be effectively guaranteed, promoting the stabilization and mass production of piezoelectric drive components.

[0003] For example, the Chinese authorized patent CN207763646U, entitled "A Piezoelectric Ceramic Testing Device," includes a base, a support frame on the upper surface of the base, a support seat fixedly connected to the upper end of the support frame, a fixed seat on the side wall of the support seat via a fastening spring engagement structure, and a connection between the fixed seat and the support seat via multiple bolts. A first groove is formed on the support seat, and a second groove is formed on the fixed seat. Piezoelectric ceramic is disposed between the first and second grooves. A mounting seat is provided on the upper surface of the base, and a sliding groove is provided on the mounting seat. A movable block is slidably connected to the sliding groove, and a threaded rod is threadedly connected to the movable block. A connecting seat is fixedly connected to the upper end of the movable block, and a test spring is provided between the mounting seat and the connecting seat.

[0004] Existing technologies for measuring the maximum displacement of piezoelectric ceramics commonly use laser interferometry and mechanical measurement methods. While laser interferometry can ensure high measurement accuracy, the small size of piezoelectric ceramics makes this method difficult to operate and time-consuming, making it unsuitable for large-volume, high-frequency testing tasks. Therefore, it does not meet current needs. To address this, we propose a rapid clamping fixture for piezoelectric ceramic stacking testing. Utility Model Content

[0005] The purpose of this invention is to provide a quick clamping fixture for testing piezoelectric ceramic stacks, in order to solve the problem mentioned in the background art of how to efficiently and accurately test the elongation of piezoelectric ceramic stacks in the field of micro-displacement measurement.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a quick clamping fixture for piezoelectric ceramic stacking test, comprising a piezoelectric ceramic mounting assembly and a piezoelectric ceramic pressure application assembly. The piezoelectric ceramic mounting assembly consists of a fixing plate and a housing. The housing has a placement cavity for placing piezoelectric ceramic stacks. The piezoelectric ceramic pressure application assembly includes a pressure plate slidably mounted on the side of the housing and a pressure column at the upper end of the placement cavity (3) inside the housing. The pressure plate is slidably connected to the pressure column through a sliding probe.

[0007] Furthermore, the pressure plate is provided in two parts, and the through holes of the two pressure plate mounting parts overlap. The pressure plate is rotatably mounted to the housing through a bushing.

[0008] Furthermore, a pressure column adapter is fixedly installed on the top of the housing. One end of the pressure column is slidably installed inside the housing, and the other end is limited by the pressure column adapter and slidably installed with the center hole at the bottom of the pressure column adapter.

[0009] Furthermore, the top of the internal placement cavity of the housing is provided with an opening, and the lower part of the pressure column is provided with a circular boss, the diameter of which is larger than the diameter of the opening at the top of the placement cavity.

[0010] Furthermore, a pressure cap is fixedly installed on the upper end of the pressure column, and one end of the sliding measuring rod is fixedly installed on the pressure column through the pressure cap, while the other end is slidably connected to the pressure plate.

[0011] Furthermore, a preload spring is installed between the lower part of the pressure column, located on the protrusion at one end of the housing cavity, and the bottom of the pressure column transition.

[0012] Furthermore, a through hole is provided in the middle of the top cover, and a detection point is provided at the top of the pressure column, with the detection point aligned with the through hole at the top of the top cover.

[0013] Furthermore, adapter holes are provided at the four corners of the fixing plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The piezoelectric ceramic mounting component and the pressure application component of the clamping fixture of this utility model are structurally coordinated with each other. The hollow part in the middle of the shell is adapted to the stacking size of the piezoelectric ceramics, making it easy to put them in. The pressure application component can switch between relaxation and pressure states by manually operating the force-saving lever. The operation process is simple and reduces the difficulty of operation.

[0016] 2. Compared with the laser interferometer method, which has the problems of high operation difficulty and long testing process, this fixture can quickly complete the pre-tightening and displacement test of piezoelectric ceramics, meet the needs of large-volume and high-frequency testing tasks, and greatly improve the efficiency of piezoelectric testing.

[0017] 3. This utility model uses the opposing pressure design between the pressure rod and the piezoelectric ceramic to make the pressure rod produce a displacement in the same direction and at the same distance when the piezoelectric ceramic elongates. This makes it easy to measure the elongation at the detection point at the top of the pressure rod and ensures measurement accuracy. At the same time, displacement measuring instruments of different accuracies can be flexibly selected to meet different measurement needs. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is another perspective view of the present invention;

[0020] Figure 3 This is a cross-sectional view of the internal structure of this utility model;

[0021] Figure 4 This is a top view of the present invention.

[0022] In the diagram: 1. Fixing plate; 2. Housing; 3. Placement cavity; 4. Piezoelectric ceramic stack; 5. Screw; 6. Adapter hole; 7. Left pressure plate; 8. Right pressure plate; 9. Bushing; 10. Top cover; 11. Detection point; 12. Slot; 13. Pressure column adapter; 14. Pressure column; 15. Pressure column cap; 16. Sliding side rod; 17. Preload spring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-4This utility model provides an embodiment of a quick-clamping fixture for testing piezoelectric ceramic stacks, comprising a piezoelectric ceramic mounting assembly and a piezoelectric ceramic pressure application assembly. The piezoelectric ceramic mounting assembly consists of a fixing plate 1 and a housing 2. The housing 2 has a placement cavity 3 for placing piezoelectric ceramic stacks 4 inside. The piezoelectric ceramic pressure application assembly includes a left pressure plate 7 and a right pressure plate 8 disposed on both sides of the housing 2. The through holes of the mounting portions of the left pressure plate 7 and the right pressure plate 8 coincide, and they are rotatably engaged with the housing 2 through bushings 9. The piezoelectric ceramic pressure application assembly also includes a pressure column 14 disposed inside the upper end of the housing 2. The pressure column 14 is externally... A pressure column adapter 13 is installed in the middle position. The pressure column 14 is slidably engaged with the center hole of the pressure column adapter 13. The bottom of the pressure column adapter 13 is fixed to the upper end face of the housing 2. A pressure column cap 15 is installed on the upper end of the pressure column 14 and is threadedly connected to the pressure column 14. A top cover 10 is installed on the top of the pressure column cap 15 and is fixed to the pressure column adapter 13. Sliding side rods 16 are installed on both sides of the pressure column cap 15 and one end of the sliding side rod 16 is threadedly connected to the pressure column cap 15. Openings for cooperating with the sliding side rods 16 are respectively opened on the left pressure plate 7 and the right pressure plate 8.

[0025] The left pressure plate 7 and the right pressure plate 8 are rotatably connected to the housing 2 via the bushing 9, forming a force-saving lever structure. When the left and right pressure plates are manually operated, the lever rotates, causing the sliding side rod 16 to move, which in turn drives the pressure column 14 to slide axially along the center hole of the pressure column adapter 13, ensuring that a stable preload is generated when the pressure column 14 contacts the piezoelectric ceramic stack 4. The force-saving lever structure design allows the operator to achieve preload of the pressure column on the piezoelectric ceramic with a small force, reducing the intensity of operation; the pressure column adapter 13 is fixed to the housing 2, providing a sliding guide for the pressure column 14 and ensuring the stability of the pressure application process.

[0026] Please see Figure 2 , Figure 3 and Figure 4 Both sides of the left pressure plate 7 and the right pressure plate 8 are provided with slots 12. The sliding side rod 16 passes through the pressure column cap 15 and the pressure column adapter 13 and extends to the outside of the left pressure plate 7 and the right pressure plate 8 respectively through the slots 12. After passing through the pressure column cap 15 and the pressure column adapter 13, the end of the sliding side rod 16 is embedded in the slots 12 of the left and right pressure plates. When the left and right pressure plates rotate around the bushing 9, the inner wall of the slot 12 pushes the sliding side rod 16 to move, thereby driving the pressure column 14 to move up and down synchronously, realizing the switching between the pressure application component and the pressure application state. The cooperation between the slot 12 and the sliding side rod 16 forms a mechanical linkage, so that the manual operation of the pressure plate is directly converted into the displacement of the pressure column, and the operation process is simple and efficient. By limiting the movement trajectory of the sliding side rod, deviation during the pressure application process is avoided, ensuring uniform force on the piezoelectric ceramic stack.

[0027] Please see Figure 3Both the upper end of the housing 2 and the interior of the pressure column adapter 13 are provided with cavities to limit the sliding distance of the pressure column 14. The cavities at the upper end of the housing 2 and inside the pressure column adapter 13 serve as limiting structures. When the pressure column 14 slides axially, its protrusion part will touch the inner wall of the cavity, thereby limiting the maximum sliding stroke of the pressure column 14 and avoiding excessive pressure that could damage the piezoelectric ceramic stack. The physical limit can prevent the piezoelectric ceramic stack from being over-pressurized due to excessive force by the operator, thus protecting the safety of the tested component.

[0028] Please see Figure 3 A preload spring 17 is installed between the boss of the pressure column 14 at one end of the cavity of the housing 2 and the bottom of the pressure column adapter 13. The preload spring 17 is installed between the boss of the pressure column 14 and the bottom of the pressure column adapter 13, providing holding force for the two working states of the pressure application assembly.

[0029] Please see Figure 1 , Figure 3 and Figure 4 A through hole is provided in the middle of the top cover 10, and a detection point 11 is provided at the top of the pressure column 14. The detection point 11 is aligned with the through hole at the top of the top cover 10. When the piezoelectric ceramic stack elongates under the action of voltage, it will push the pressure column 14 to move upward synchronously. The detection point 11 moves with the pressure column 14 and is exposed through the through hole of the top cover 10. At this time, by aligning a displacement measuring instrument with the detection point 11, the displacement of the pressure column 14 can be directly obtained. This displacement is equal to the elongation of the piezoelectric ceramic.

[0030] Please see Figure 1 Screws 5 are provided at the four corners of the bottom plate of the housing 2, and the bottom of the screws 5 are threaded to the fixing plate 1. The housing 2 is threaded to the fixing plate 1 through the four corner screws 5, forming a detachable fixing structure. During installation, tightening the screws 5 can firmly fix the housing 2 to the fixing plate 1; during disassembly, loosening the screws 5 can separate the housing from the fixing plate, which is convenient for maintenance or replacement of internal components.

[0031] Please see Figure 1 The four corners of the fixed plate 1 are provided with adapter holes 6. The adapter holes 6 are used to fix the fixed plate 1 to the external working platform by bolts or other connectors, so that the entire fixture becomes part of the test system and ensures that the fixture remains stationary during the measurement process. The standardized adapter hole design supports the quick installation of the fixture onto different test equipment, improving the versatility and adaptability of the fixture.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A quick-clamping fixture for piezoelectric ceramic stacking testing, comprising a piezoelectric ceramic mounting assembly and a piezoelectric ceramic pressure application assembly, characterized in that: The piezoelectric ceramic mounting assembly consists of a fixing plate (1) and a housing (2). The housing (2) has a placement cavity (3) for placing piezoelectric ceramic stacks (4). The piezoelectric ceramic pressure assembly includes a pressure plate slidably mounted on the side of the housing (2) and a pressure column (14) at the upper end of the placement cavity (3) inside the housing (2). The pressure plate is slidably connected to the pressure column (14) through a sliding probe (16).

2. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: The pressure plate is provided in two parts, and the through holes of the two pressure plate mounting parts overlap. The pressure plate is rotatably installed with the housing (2) through the bushing (9).

3. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: The top of the housing (2) is fixedly installed with a pressure column adapter (13). One end of the pressure column (14) is slidably installed inside the housing (2), and the other end is limited by the pressure column adapter (13) and slidably installed with the center hole at the bottom of the pressure column adapter (13).

4. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: The housing (2) has an opening at the top of the internal placement cavity (3), and a circular boss is provided at the bottom of the pressure column. The diameter of the boss is larger than the diameter of the opening at the top of the placement cavity (3).

5. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: The upper end of the pressure column (14) is fixedly installed with a pressure column cap (15). One end of the sliding measuring rod (16) is fixedly installed on the pressure column (14) through the pressure column cap (15), and the other end is slidably connected to the pressure plate.

6. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 3, characterized in that: A preload spring (17) is installed between the lower part of the pressure column (14) on the boss at one end of the cavity of the housing (2) and the bottom of the pressure column adapter (13).

7. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: A through hole is provided in the middle of the top cover (10), and a detection point (11) is provided at the top of the pressure column (14), and the detection point (11) is aligned with the through hole at the top of the top cover (10).

8. The quick-clamping fixture for piezoelectric ceramic stacking testing according to claim 1, characterized in that: The fixing plate (1) has adapter holes (6) at its four corners.

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