Piezoelectric ceramic polarization clamp

Abstract

The utility model relates to a piezoelectric ceramic polarization clamp, which comprises a base, a pressing part and a limiting part, the base comprises a base body and a lower electrode, and the lower electrode is connected to one side of the base body; the pressing part comprises a pressing plate and an upper electrode, the pressing plate is arranged on the side, provided with the lower electrode, of the base body and has a moving stroke close to and away from the base body, and the upper electrode is connected to the side, close to the base, of the pressing plate; the limiting part is connected to the base and the pressing plate and can limit the pressing plate to move relative to the base when the pressing plate moves to the upper electrode and the electrode abut against the two opposite sides of the workpiece respectively. According to the scheme, the size of the polarization gap can be adjusted, the piezoelectric ceramic can be conveniently placed between the upper electrode and the lower electrode, accidental damage to a sample is avoided, the polarization quality is guaranteed, and the scheme can be suitable for piezoelectric ceramics of various sizes and is good in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of piezoelectric ceramic polarization fixtures, in particular to a piezoelectric ceramic polarization clamp. Background Art

[0002] As a functional material that can convert mechanical properties and electrical properties with each other, piezoelectric ceramics are widely used in various fields such as communication, measurement, biology, and aerospace. Before being used, piezoelectric materials need to be polarized to keep their electric domains in the same direction, and then experiments can be carried out.

[0003] For example, Patent CN207250566U discloses an air polarization fixture for piezoelectric ceramic sheets. The piezoelectric ceramic sheet to be polarized is inserted into the installation gap between adjacent conductive rods, so that one side of the piezoelectric ceramic sheet abuts against one of the conductive rods. Then, the utility model is placed in an oven, and the positive and negative wires of the polarization device are respectively connected to the first conductive layer and the second conductive layer. Next, the temperature of the oven is adjusted to about 200°C, and after keeping warm for 5 minutes, the power supply of the polarization device is turned on. The voltage of the polarization device is applied to both ends of the conductive rod. After keeping for 10 minutes, the power supply of the oven is turned off, and the oven door is opened. When the temperature drops to about 90°C, the power supply of the polarization device is turned off, and the utility model is taken out, and the polarization is completed.

[0004] However, the distance between the two conductive rods for clamping the piezoelectric ceramic in this patent cannot be adjusted. Since the thickness of the piezoelectric ceramic is close to the distance between the two conductive rods, it is inconvenient for the operator to place the piezoelectric ceramic between the two conductive rods, and the above patent cannot be applied to piezoelectric ceramics whose size deviates too much from the distance between the conductive rods, and the practicability is relatively poor. Summary of the Utility Model

[0005] In view of this, it is necessary to provide a piezoelectric ceramic polarization clamp to solve the technical problems that it is inconvenient for the operator to place the piezoelectric ceramic between the two conductive rods and the practicability is relatively poor in the prior art.

[0006] The utility model provides a piezoelectric ceramic polarization clamp, which includes:

[0007] A base, including a seat body and a lower electrode, and the lower electrode is connected to the seat body;

[0008] A pressing part, including a pressing plate and an upper electrode. The pressing plate is arranged on the side of the seat body where the lower electrode is provided and has a moving stroke of approaching and departing from the seat body. The upper electrode is connected to the side of the pressing plate close to the base; and

[0009] The limiting part is connected to the base and the pressing plate, and can limit the relative movement of the pressing plate with respect to the base when the pressing plate moves to a position where the upper electrode and the lower electrode respectively press against opposite sides of the workpiece.

[0010] Optionally, the pressing plate is provided with a guiding opening along a direction away from the seat body;

[0011] The limiting part includes a column and a pull rod. One end of the column is connected to the seat body, and the other end movably passes through the guiding opening. The pull rod has a pressing end arranged as an eccentric wheel. The pressing end is rotatably connected to one end of the column extending out of the guiding opening, and can press the pressing plate against a position close to the seat body during rotation to limit the relative movement of the pressing plate with respect to the seat body.

[0012] Optionally, an installation groove is further provided on a side of the guiding opening away from the seat body, and the installation groove communicates with the guiding opening;

[0013] The pressing part includes a copper insert, and the copper insert is installed in the installation groove for the pressing end to press against.

[0014] Optionally, installation screw holes are provided at the bottom of the installation groove, and the copper insert is provided with communication holes corresponding to the installation screw holes;

[0015] The pressing part further includes an installation bolt, and the threaded section of the installation bolt passes through the communication hole and is screwed into the installation screw hole.

[0016] Optionally, the limiting part further includes a reset elastic member. One end of the reset elastic member is connected to the pressing plate, and the other end is connected to the seat body to drive the pressing plate to reset to a position away from the seat body.

[0017] Optionally, the pressing part further includes a guiding sleeve. One end of the guiding sleeve is connected to a side of the pressing plate close to the seat body, and the seat body is provided with a guiding post corresponding to the guiding sleeve. One end of the guiding post extends into the guiding sleeve;

[0018] The reset elastic member is a reset spring. The reset spring is located inside the guiding sleeve, and one end presses against the end of the guiding post, and the other end presses against the pressing plate.

[0019] Optionally, there are multiple guiding sleeves, and the multiple guiding sleeves are located at opposite ends of the pressing plate. There are multiple guiding posts corresponding to the guiding sleeves.

[0020] Optionally, there are two guiding openings, and the two guiding openings are respectively located at opposite ends of the pressing plate;

[0021] The upright posts and the tie rods are respectively provided with two groups, and the two groups of upright posts are respectively inserted through the two guiding openings.

[0022] Optionally, the seat body includes a base plate and a mounting seat. The mounting seat is connected to one side of the base plate close to the pressing plate and is provided with an electrode groove for placing a workpiece. Among them, the limiting part is movably connected to the base plate and the pressing plate;

[0023] The lower electrode is installed at the bottom of the electrode groove.

[0024] Optionally, there are multiple electrode grooves. The lower electrode includes an electrode plate and multiple spring probes. The electrode plate is embedded in the base plate and communicates with the bottoms of the multiple electrode grooves. The multiple spring probes are respectively located in the multiple electrode grooves and are electrically connected to the electrode plate. Multiple upper electrodes are provided corresponding to the spring probes.

[0025] Compared with the prior art, in the piezoelectric ceramic polarization fixture provided by the present invention, the pressing plate can move close to and away from the seat body. Thus, when placing piezoelectric ceramics of different thicknesses, it can first pass through the limiting part and drive the pressing plate to move away from the seat body, and then form a polarization gap with a sufficient size between the upper electrode and the lower electrode, so as to place the piezoelectric ceramic in the polarization gap; then drive the pressing plate to move towards the seat body until the upper electrode and the lower electrode respectively press against opposite sides of the piezoelectric ceramic, and then limit the movement of the pressing plate relative to the seat body through the limiting part to ensure that the upper electrode and the lower electrode can stably make electrical contact with the piezoelectric ceramic and form a loop, and complete polarization by introducing high-voltage electricity as a medium. In this way, this solution can adjust the size of the polarization gap, facilitate the placement of the piezoelectric ceramic between the upper electrode and the lower electrode, avoid accidental damage to the sample, and can be applicable to piezoelectric ceramics of various sizes, with good practicability.

[0026] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the description, the preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic structural diagram of an embodiment when the piezoelectric ceramic polarization fixture provided by the present invention polarizes a piezoelectric ceramic;

[0029] Figure 2 is Figure 1 a schematic diagram of the partial structure of the piezoelectric ceramic polarization fixture in

[0030] Figure 3 is Figure 1 a schematic diagram of the partial structure of the piezoelectric ceramic polarization fixture from another angle in

[0031] Figure 4 is Figure 1 an enlarged schematic diagram of the partial structure of the base and the pressing part in

[0032] Figure 5 is Figure 1 a sectional view of the seat body, the pressing plate and the limiting part in

[0033] Figure 6 is Figure 1 a schematic diagram of the partial structure of the pressing plate in

[0034] Figure 7 is Figure 1 a schematic diagram of the structure of the base in

[0035] Figure 8 is Figure 7 a top view of the base in

[0036] Explanation of the reference numerals in the drawings:

[0037] 100, piezoelectric ceramic polarization fixture; 1, base; 11, seat body; 111, substrate; 112, mounting seat; 112a, electrode groove; 12, lower electrode; 121, electrode plate; 122, spring probe; 13, guide post; 2, pressing part; 21, pressing plate; 21a, guide port; 21b, mounting groove; 21c, mounting screw hole; 22, upper electrode; 22a, polarization gap; 23, copper insert; 23a, communication hole; 24, guide sleeve; 3, limiting part; 31, column; 32, pull rod; 321, pressing end; 33, reset elastic member; 200, piezoelectric ceramic. Detailed implementation manners

[0038] The preferred embodiments of the present invention will be specifically described below with reference to the drawings. The drawings form a part of this application and are used together with the embodiments of the present invention to explain the principle of the present invention, and are not used to limit the scope of the present invention.

[0039] Please refer to Figures 1 to 8, this piezoelectric ceramic polarization fixture 100 includes a base 1, a pressing part 2 and a limiting part 3; the base 1 includes a base body 11 and a lower electrode 12, and the lower electrode 12 is connected to the base body 11; the pressing part 2 includes a pressing plate 21 and an upper electrode 22, the pressing plate 21 is arranged on one side of the base body 11 where the lower electrode 12 is provided, and has a moving stroke of approaching and departing from the base body 11, and the upper electrode 22 is connected to the side of the pressing plate 21 close to the base 1; the limiting part 3 is connected to the base 1 and the pressing plate 21, and when the pressing plate 21 moves to the upper electrode 22 and the lower electrode 12 respectively press against the opposite sides of the workpiece, it can limit the relative movement of the pressing plate 21 with respect to the base 1.

[0040] In the piezoelectric ceramic polarization fixture 100 provided by the present utility model, the pressing plate 21 can move closer to and away from the base body 11, so that when placing piezoelectric ceramics 200 with different thicknesses, it can first pass through the limiting part 3 and drive the pressing plate 21 to move away from the base body 11, and then form a polarization gap 22a with sufficient size between the upper electrode 22 and the lower electrode 12, so as to facilitate placing the piezoelectric ceramic 200 in the polarization gap 22a; then drive the pressing plate 21 to move towards the base body 11 until the upper electrode 22 and the lower electrode 12 respectively press against the opposite sides of the piezoelectric ceramic 200, and then limit the relative movement of the pressing plate 21 with respect to the base body 11 through the limiting part 3 to ensure that the upper electrode 22 and the lower electrode 12 can stably make electrical contact with the piezoelectric ceramic 200 and form a loop, and complete polarization by introducing high-voltage electricity as a medium. In this way, this solution can adjust the size of the polarization gap 22a, facilitate placing the piezoelectric ceramic 200 between the upper electrode 22 and the lower electrode 12, avoid accidental damage to the sample, and can be applicable to piezoelectric ceramics 200 of various sizes, with good practicability.

[0041] It should be noted that, in one embodiment, the limiting part 3 can be set in the form of a hydraulic cylinder, the cylinder body of the hydraulic cylinder is installed on the base body 11, and the head of the telescopic rod is connected to the pressing plate 21, and the hydraulic cylinder shuts down when driving the pressing plate 21 to move to the upper electrode 22 and the lower electrode 12 respectively press against the opposite sides of the workpiece, so as to limit the relative movement of the pressing plate 21 with respect to the base 1. In another embodiment, the limiting part 3 can be set as an electrode with a telescopic shaft, and its working form is the same as that of the hydraulic cylinder, and the limiting part 3 can also be set in other forms.

[0042] In this solution, please refer to Figure 2 and Figure 3, the pressing plate 21 is provided with a guiding port 21a along the direction away from the seat body 11; the limiting part 3 includes a column 31 and a pull rod 32. One end of the column 31 is connected to the seat body 11, and the other end is movably inserted through the guiding port 21a. The pull rod 32 has a pressing end 321 arranged as an eccentric wheel. The pressing end 321 is rotatably connected to the end of the column 31 extending out of the guiding port 21a, and during rotation, it can press the pressing plate 21 against a position close to the seat body 11 to limit the relative movement of the pressing plate 21 with respect to the seat body 11. In this embodiment, after the piezoelectric ceramic 200 is placed in the polarization gap 22a between the upper electrode 22 and the lower electrode 12, the pull rod 32 is rotated, so that the eccentrically arranged pressing end 321 of the pull rod 32 gradually drives the pressing plate 21 to move towards the direction close to the seat body 11 during rotation until the pull rod 32 rotates to the limit position and stops; and when it is necessary to take out the piezoelectric ceramic 200, the pull rod 32 can be rotated in the reverse direction, which is simple and convenient to operate, has good stability, and saves costs at the same time.

[0043] Furthermore, an installation groove 21b is also provided on the side of the guiding port 21a away from the seat body 11, and the installation groove 21b communicates with the guiding port 21a; the pressing part 2 includes a copper insert 23, and the copper insert 23 is installed in the installation groove 21b for the pressing end 321 to press against. In this embodiment, the copper insert 23 is provided corresponding to the pressing end 321 to improve the wear resistance of the pressing plate 21 at the position corresponding to the pressing end 321. At the same time, the copper insert 23 also has a certain ductility to facilitate the stable pressing of the pull rod 32 against the pressing plate 21.

[0044] Specifically, an installation screw hole 21c is provided at the bottom of the installation groove 21b, and the copper insert 23 is provided with a communication hole 23a corresponding to the installation screw hole 21c; the pressing part 2 further includes an installation bolt, and the threaded section of the installation bolt passes through the communication hole 23a and is screwed into the installation screw hole 21c. In this embodiment, the copper insert 23 is fixed on the pressing plate 21 through the installation bolt, so that it is convenient for the operator to replace the copper insert 23 after it is severely worn, ensuring that the pressing end 321 can effectively press against the pressing plate 21, and the operation is simple and convenient.

[0045] Further, the limiting part 3 further includes a reset elastic member 33. One end of the reset elastic member 33 is connected to the pressing plate 21, and the other end is connected to the seat body 11, so as to drive the pressing plate 21 to reset to a position away from the seat body 11. In this way, after the piezoelectric ceramic 200 is polarized, the pull rod 32 is rotated in the reverse direction, and the pressing plate 21 is automatically driven by the reset elastic member 33 to move away from the seat body 11 to open the polarization gap 22a, facilitating the operator to take out the piezoelectric ceramic 200 and further improving the polarization efficiency.

[0046] Furthermore, please refer to Figure 5 and Figure 6, the pressing part 2 further includes a guide sleeve 24. One end of the guide sleeve 24 is connected to the side of the pressing plate 21 close to the seat body 11. The seat body 11 is provided with a guide post 13 corresponding to the guide sleeve 24. One end of the guide post 13 extends into the guide sleeve 24; the reset elastic member 33 is a reset spring. The reset spring is located in the guide sleeve 24, with one end pressing against the end of the guide post 13 and the other end pressing against the pressing plate 21. In this embodiment, through the cooperation of the guide sleeve 24 and the guide post 13, the pressing plate 21 can stably move along the axial direction of the guide sleeve 24, avoiding the misalignment of the upper electrode 22 and the lower electrode 12 and ensuring the polarization quality. And in this solution, there are multiple guide sleeves 24. The multiple guide sleeves 24 are located at opposite ends of the pressing plate 21, and there are multiple guide posts 13 corresponding to the guide sleeves 24. Specifically, in this embodiment, two guide sleeves 24 are respectively arranged at intervals at opposite ends of the pressing plate 21. Correspondingly, two guide posts 13 are also respectively arranged at intervals at both ends of the seat body 11 corresponding to the pressing end 321 to further ensure the stable movement of the pressing plate 21.

[0047] Further, there are two guide openings 21a. The two guide openings 21a are respectively located at opposite ends of the pressing plate 21; there are two groups of the upright posts 31 and the pull rods 32. The two groups of upright posts 31 respectively pass through the two guide openings 21a. In this embodiment, a pull rod 32 is arranged at each of the opposite ends of the pressing plate 21 to ensure that the pull rod 32 can stably press against the pressing plate 21 and improve the stability of the limit on the pressing plate 21. In addition, it should be noted that in this solution, both the upright post 31 and the guide post 13 are connected to the seat body 11 through screw connectors for easy replacement.

[0048] Further, please refer to Figure 7 and Figure 8 , the seat body 11 includes a base plate 111 and a mounting seat 112. The mounting seat 112 is connected to the side of the base plate 111 close to the pressing plate 21 and is provided with an electrode groove 112a for placing the workpiece. Among them, the limiting part 3 is movably connected to the base plate 111 and the pressing plate 21; the lower electrode 12 is installed at the bottom of the electrode groove 112a. In this embodiment, the piezoelectric ceramic 200 is placed in the electrode groove 112a to avoid electromagnetic deviation and ensure the polarization quality.

[0049] Furthermore, there are multiple electrode grooves 112a. The lower electrode 12 includes an electrode plate 121 and multiple spring probes 122. The electrode plate 121 is embedded in the base plate 111 and communicates with the bottoms of the multiple electrode grooves 112a. The multiple spring probes 122 are respectively located in the multiple electrode grooves 112a and are electrically connected to the electrode plate 121. The upper electrode 22 is provided with multiple corresponding to the multiple spring probes 122. In this way, multiple samples can be polarized at the same time, and rapid feeding can be carried out for mass production, reducing unnecessary time, saving labor costs and improving efficiency. It should be noted that in this embodiment, the upper electrode 22 is set in the form of a metal round head cross needle.

[0050] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A piezoelectric ceramic polarization fixture, characterized in that: It includes: A base, comprising a base body and a lower electrode, wherein the lower electrode is connected to the base body; A clamping part, comprising a clamping plate and an upper electrode, wherein the clamping plate is disposed on a side of the base body where the lower electrode is disposed and has a movable stroke approaching and moving away from the base body, and the upper electrode is connected to a side of the clamping plate close to the base; and The limiting part is connected to the base and the clamping plate, and can limit the movement of the clamping plate relative to the base when the clamping plate moves to the point where the upper electrode and the lower electrode are respectively pressed against two opposite sides of the workpiece.

2. The piezoelectric ceramic polarization fixture according to claim 1, characterized in that: The pressing plate is provided with a guide opening in a direction away from the seat body; The limiting portion includes a column and a pull rod, one end of the column is connected to the seat body, and the other end is movably inserted into the guide port, the pull rod has a clamping end arranged in the form of an eccentric wheel, the clamping end is rotatably connected to one end of the column extending out of the guide port, and during the rotation process, the clamping plate can be clamped to a position close to the seat body to limit the movement of the clamping plate relative to the seat body.

3. The piezoelectric ceramic polarization fixture according to claim 2, characterized in that: A mounting groove is further provided on a side of the guide opening away from the seat body, and the mounting groove is connected to the guide opening; The pressing portion comprises a copper insert, and the copper insert is installed in the installation groove for the pressing end to press against.

4. The piezoelectric ceramic polarization fixture according to claim 3, characterized in that: The bottom of the mounting groove is provided with a mounting screw hole, and the copper insert is provided with a connecting hole corresponding to the mounting screw hole; The pressing portion further includes a mounting bolt, a threaded section of which passes through the communicating hole and is screwed into the mounting screw hole.

5. The piezoelectric ceramic polarization fixture according to claim 2, characterized in that: The limiting portion further comprises a reset elastic member, one end of which is connected to the clamping plate, and the other end of which is connected to the seat body, so as to drive the clamping plate to reset to a position away from the seat body.

6. The piezoelectric ceramic polarization fixture according to claim 5, characterized in that: The clamping part further comprises a guide sleeve, one end of which is connected to a side of the clamping plate close to the seat body, the seat body is provided with a guide column corresponding to the guide sleeve, and one end of the guide column extends into the guide sleeve; The resetting elastic member is a resetting spring, which is located in the guide sleeve, with one end of the resetting spring pressed against the end of the guide column and the other end of the resetting spring pressed against the clamping plate.

7. The piezoelectric ceramic polarization fixture according to claim 6, characterized in that: There are multiple guide sleeves, which are located at two opposite ends of the clamping plate, and there are multiple guide posts corresponding to the guide sleeves.

8. The piezoelectric ceramic polarization fixture according to claim 2, characterized in that: There are two guide openings, and the two guide openings are respectively located at two opposite ends of the pressing plate; The columns and the pull rods are respectively provided with two groups, and the columns of the two groups are respectively penetrated through the two guide openings.

9. The piezoelectric ceramic polarization fixture according to claim 1, characterized in that: The seat body includes a base plate and a mounting seat, wherein the mounting seat is connected to a side of the base plate close to the clamping plate and is provided with an electrode slot for placing a workpiece, wherein the limiting portion is movably connected to the base plate and the clamping plate; The lower electrode is installed at the bottom of the electrode groove.

10. The piezoelectric ceramic polarization fixture according to claim 9, characterized in that: There are multiple electrode grooves, the lower electrode includes an electrode plate and multiple spring probes, the electrode plate is embedded in the substrate and connected to the bottoms of the multiple electrode grooves, the multiple spring probes are respectively located in the multiple electrode grooves and are electrically connected to the electrode plate, and the upper electrode is provided with multiple corresponding spring probes.

Images