Precise jig for batch clamping of end faces of piezoelectric stacks
By designing a precision fixture for batch clamping of the piezoelectric stack end faces, the problems of low efficiency and low precision in piezoelectric stack patching were solved, achieving process consistency and stable product quality in large-scale production.
Patent Information
- Application Number
- CN202422922260.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-28
AI Technical Summary
The existing piezoelectric stack patch process has problems such as low efficiency, low precision and inconsistent quality, making it difficult to meet the needs of large-scale production.
A precision fixture for batch clamping of piezoelectric stack end faces is designed. It includes a flat fixture base plate and a pressing guide block. The piezoelectric stack is pressed by elastic force to ensure the accuracy and stability of the pasting of strain gauges and terminal sheets.
The precision and efficiency of piezoelectric stack patching are improved, process consistency of large-scale production is achieved, the cost of manual operation is reduced and product quality is improved.
Smart Images
Figure CN223395146U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of piezoelectric stack patches, in particular to a precision jig for batch clamping of piezoelectric stack end faces. Background Art
[0002] As shown in Figures 1(a) and 1(b), the piezoelectric stack is a rectangular parallelepiped with six faces. The top and bottom faces are where strain gauges and terminal strips are attached. The left and right sides are pre-welded with the piezoelectric stack's positive and negative leads, respectively. When the piezoelectric stack is powered, it can achieve micron-scale telescopic displacement. In the aerospace field, precise displacement measurement of the piezoelectric stack is required. This can be achieved by attaching strain gauges and terminal strips to the surface.
[0003] In the existing production process, in order to stick strain gauges and terminal sheets on the piezoelectric stack, the surface of the piezoelectric stack needs to be cleaned, and then the strain gauges and terminal sheets are stuck on the surface of the piezoelectric stack. After the strain gauges and terminal sheets are stuck on the surface of the piezoelectric stack, the strain gauges and terminal sheets stuck on the piezoelectric stack need to be pressed tightly and then baked at high temperature to cure in the pressed state.
[0004] The existing piezoelectric stack patching process is manual. First, glue is applied to the strain gauge and terminal strips using a cotton swab. The strain gauge and terminal strips are then manually attached to the piezoelectric stack. This manual attachment process often results in misaligned attachments and excessive or insufficient glue, leading to low production efficiency. This results in low efficiency and precision in the current manufacturing process, making it unsuitable for large-scale production and difficult to achieve consistent quality. Utility Model Content
[0005] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a precision fixture for batch clamping of piezoelectric stack end faces, thereby improving the accuracy and efficiency of piezoelectric stack patches and meeting the needs of large-scale batch production.
[0006] In order to achieve the above purpose, the utility model has the following technical solutions:
[0007] A precision jig for batch clamping of piezoelectric stack end faces comprises a flat jig base plate. The surface of the flat jig base plate is machined with a plurality of mounting grooves for placing the piezoelectric stacks according to the size of the piezoelectric stacks. A pressing guide block is provided at the top of the mounting groove. The piezoelectric stack is pressed by the flat jig base plate and the pressing guide block. The pressing guide block presses the piezoelectric stack with elastic force.
[0008] As a preferred solution, the thickness of the flat fixture bottom plate is thinner than the thickness of the piezoelectric stack, and the piezoelectric stack is higher than the surface of the flat fixture bottom plate.
[0009] Furthermore, after assembly, both the upper and lower surfaces of the piezoelectric stack are 0.2 mm higher than the surface of the flat fixture bottom plate.
[0010] As a preferred solution, the mounting grooves processed on the bottom plate of the flat fixture are all rectangular parallelepiped grooves that match the shape of the piezoelectric stack.
[0011] As a preferred solution, the mounting grooves are arranged side by side on the same side of the surface of the flat fixture base plate.
[0012] As a preferred solution, the flat fixture base plate is processed with two first buried wire grooves and a second buried wire groove at the bottom of the processing installation groove position for leading out the positive and negative leads of the piezoelectric stack.
[0013] As a preferred solution, a top rubber is provided at the top of the pressing guide block, and a bottom rubber is provided in the mounting groove; when the piezoelectric stack is pressed by cooperating with the flat fixture bottom plate and the pressing guide block, the two end faces of the piezoelectric stack are contacted by the top rubber and the bottom rubber.
[0014] As a preferred solution, a spring is provided at the bottom end of the pressing guide block, and under the elastic force of the spring, the pressing guide block presses the piezoelectric stack.
[0015] As a preferred solution, the precision jig for batch clamping of the piezoelectric stack end faces also includes a clamping guide block base plate spliced with the flat jig base plate. The surface of the clamping guide block base plate is processed with a slide groove for the clamping guide block to move relative to the piezoelectric stack. The spring is arranged inside the slide groove, and a clamping cylindrical handle is set from the outside of the clamping guide block base plate to the inside through the spring and connected to the bottom end of the clamping guide block.
[0016] As a preferred solution, the flat-mounted jig bottom plate is integrally processed from an aluminum plate, and a jig bottom plate air-avoidance groove is processed at the center of the surface of the flat-mounted jig bottom plate.
[0017] Compared with the prior art, the present invention has at least the following beneficial effects:
[0018] During the piezoelectric stack patching process, the present invention can be used to simultaneously place several piezoelectric stacks into the mounting slots on the flat-mounted fixture base plate, and the piezoelectric stacks can be compacted by cooperating with the compacting guide blocks provided at the top of the mounting slots and the flat-mounted fixture base plate. Furthermore, the compacting guide blocks of the present invention compact the piezoelectric stacks using elastic force, ensuring reliable fixation without damaging the piezoelectric stacks. The present invention meets the process requirements for mass-producing strain gauges on both sides of piezoelectric stacks, can replace traditional manual patching, has the advantage of good process consistency, and improves the accuracy and efficiency of piezoelectric stack patching.
[0019] Furthermore, a top rubber is provided at the top of the compression guide block of the utility model, and a bottom rubber is provided in the installation groove. When the piezoelectric stack is compressed by cooperating with the compression guide block through the flat-mounted jig bottom plate, the top rubber and the bottom rubber contact the two end faces of the piezoelectric stack, so that the jig compresses the piezoelectric stack through soft rubber contact, effectively avoiding damage to the piezoelectric stack during the compression process.
[0020] Furthermore, the thickness of the flat-mounted fixture base plate of the utility model is thinner than that of the piezoelectric stack. After assembly, the upper and lower surfaces of the piezoelectric stack are both 0.2 mm higher than the surface of the flat-mounted fixture base plate, making it convenient to use equipment to clean the upper and lower surfaces of the piezoelectric stack and to paste strain gauges and terminal sheets on the upper and lower surfaces.
[0021] Furthermore, the precision jig for batch clamping of the end faces of the piezoelectric stacks of the present invention also includes a clamping guide block base plate spliced with the flat jig base plate. The surface of the clamping guide block base plate is processed with a slide groove for the clamping guide block to move relative to the piezoelectric stack. The spring is arranged inside the slide groove. The slide groove provides space for the clamping guide block and the spring to move. A clamping cylindrical handle is set from the outside of the clamping guide block base plate to the inside through the spring and connected to the bottom end of the clamping guide block. By operating the clamping cylindrical handle, the clamping guide block can be pulled and the spring can be compressed. When the piezoelectric stack is placed in place in the installation groove, the clamping cylindrical handle is released, so that the clamping guide block can be compressed by the elastic force of the spring. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 (a) is a schematic diagram of the structure of a prior art piezoelectric stack before patching;
[0024] Figure 1 (b) is a schematic diagram of the structure of the prior art piezoelectric stack after patching;
[0025] Figure 2 A three-dimensional schematic diagram of the overall structure of a precision fixture for batch clamping of piezoelectric stack end faces according to an embodiment of the utility model;
[0026] Figure 3 An enlarged schematic diagram of the local structure of a single piezoelectric stack assembled using a precision jig for batch clamping of piezoelectric stack end faces according to an embodiment of the utility model;
[0027] Figure 4 A schematic top view of the overall structure of a precision jig for batch clamping of piezoelectric stack end faces according to an embodiment of the utility model;
[0028] Figure 5 Schematic diagram of the surface of the piezoelectric stack according to the embodiment of the utility model, in which both the upper and lower surfaces are higher than the bottom plate of the flat-mounted fixture;
[0029] In the attached figure: 1-flat fixture base plate; 2-piezoelectric stack; 3-pressing guide block; 4-top rubber; 5-bottom rubber; 6-spring; 7-pressing cylindrical handle; 8-first buried wire groove; 9-second buried wire groove; 10-pressing guide block base plate; 11-fixture base plate avoidance groove; 12-strain gauge; 13-terminal piece. DETAILED DESCRIPTION
[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can also derive other embodiments without making any creative work.
[0031] It should be understood that the embodiments disclosed herein are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to variously utilize the present disclosure with substantially any suitable detailed structure.
[0032] This description may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," each of which may refer to one or more of the same or different embodiments according to the present disclosure.
[0033] Piezoelectric stack patching is a delicate operation, and the quality of its process directly impacts the performance and reliability of the piezoelectric stack. Currently, many production lines still rely on manual patching. While this process can meet production needs to a certain extent, it has some significant limitations. Advantages of manual patching include high flexibility and adaptability, enabling the processing of piezoelectric stack patches of varying shapes and sizes. However, its disadvantages are more significant, including its relatively slow speed, making it difficult to meet the demands of large-scale production. With intensified market competition and increasing order volumes, production efficiency has become a key factor restricting business development. Furthermore, due to variability in manual operation and factors such as fatigue, patch quality can fluctuate. This can lead to unstable piezoelectric stack performance and affect overall product quality.
[0034] As labor costs continue to rise, the production costs of manual patching are becoming increasingly high. This is a significant burden for companies, especially when profit margins are limited. To improve the production efficiency and quality stability of piezoelectric stack patching and reduce production costs, automated patching is a viable solution. Automated patching equipment can replace manual patching operations, offering high precision, high efficiency, and high stability. By introducing automated patching equipment, companies can significantly improve production efficiency, reduce production costs, and improve product quality and reliability.
[0035] See also Figures 2 to 4 The utility model proposes a precision jig for batch clamping of piezoelectric stack end faces, including a flat jig base plate 1. The surface of the flat jig base plate 1 is processed into a plurality of mounting grooves for placing the piezoelectric stack 2 according to the size of the piezoelectric stack 2. A pressing guide block 3 is provided at the top of the mounting groove. The piezoelectric stack 2 is pressed by the flat jig base plate 1 and the pressing guide block 3. The pressing guide block 3 presses the piezoelectric stack 2 with elastic force.
[0036] In one embodiment, the mounting grooves processed on the flat-mounted jig base plate 1 of the present invention all adopt a rectangular structure groove body that matches the appearance of the piezoelectric stack 2. Furthermore, a top rubber 4 is provided at the top of the pressing guide block 3, the mounting groove is slightly longer than the piezoelectric stack 2, and a bottom rubber 5 is provided at the bottom end of the mounting groove. When the piezoelectric stack 2 is pressed by the flat-mounted jig base plate 1 and the pressing guide block 3, the top rubber 4 and the bottom rubber 5 contact the two end faces of the piezoelectric stack 2. The utility model uses soft rubber to press the two end faces of the piezoelectric stack 2, so that the soft rubber contacts when the jig presses the piezoelectric stack 2.
[0037] Of course, in some other possible implementations, the compression guide block 3 may be directly made of a material with a certain elasticity, so that it can directly contact the end face of the piezoelectric stack 2 without using rubber, and the elastic compression effect can also be achieved.
[0038] In another embodiment, a spring 6 is provided at the bottom end of the compression guide block 3 of the present invention, and the compression guide block 3 is supported by the spring 6. Under the elastic force of the spring 6, the compression guide block 3 compresses the piezoelectric stack 2.
[0039] The precision jig for batch clamping of the end faces of the piezoelectric stacks of the present invention also includes a clamping guide block base plate 10 spliced with the flat jig base plate 1. The surface of the clamping guide block base plate 10 is processed with a slide groove for the relative movement of the clamping guide block 3 relative to the piezoelectric stack 2. The spring 6 is arranged inside the slide groove. The slide groove provides space for the movement of the clamping guide block 3 and the spring 6, and a clamping cylindrical handle 7 is provided from the outside of the clamping guide block base plate 10 to the inside through the spring 6 and connected to the bottom end of the clamping guide block 3. By manipulating the clamping cylindrical handle 7, the clamping guide block 3 can be pulled and the spring 6 can be compressed. When the piezoelectric stack 2 is placed in place in the installation groove, the clamping cylindrical handle 7 is released, and the clamping guide block 3 can be compressed by the elastic force of the spring 6.
[0040] In another embodiment, the mounting grooves of the present invention are arranged side by side on the same side of the surface of the flat fixture base plate 1 .
[0041] In another embodiment, the flat-mounted fixture base plate 1 of the present invention is processed with two first wire-burying grooves 8 and second wire-burying grooves 9 at the bottom of the processing installation groove position for leading out the positive and negative leads of the piezoelectric stack 2. The first wire-burying groove 8 and the second wire-burying groove 9 are two thin grooves whose width matches the lead diameter. The positive and negative leads are respectively placed in the two thin grooves for easy fixation.
[0042] In another embodiment, the flat-mounted fixture base plate 1 of the present invention is machined integrally from aluminum sheet, with a fixture base plate air-avoidance groove 11 machined into the center of the surface of the flat-mounted fixture base plate 1. The embodiment shown in the figure has 16 rectangular parallelepiped mounting grooves arranged side by side on the same side of the flat-mounted fixture base plate 1, allowing for the placement of 16 piezoelectric stacks 2.
[0043] The design of the jig base plate's clearance grooves is crucial in jig manufacturing. A clearance groove is a notch designed to provide space or clearance. In the jig base plate, the clearance groove allows pins or similar components to be inserted without direct contact with the base plate, ensuring smooth assembly and securement of the component. The clearance groove prevents interference between the jig base plate and other parts or components during assembly, ensuring proper jig operation. Precisely designing the clearance groove's position and dimensions improves assembly accuracy between the jig and other components, ensuring product quality and stability. The placement and layout of the clearance grooves should be determined based on the overall jig design and assembly requirements. The depth and clearance of the clearance grooves should be adjusted based on actual needs. The depth is typically sufficient to ensure pins or components can be fully inserted without direct contact with the base plate. The clearance should meet electrical clearance and safety requirements. Precisely designed and manufactured clearance grooves ensure proper jig operation and high-quality product production.
[0044] In other embodiments, see Figure 5The thickness of the flat-mount fixture base plate 1 of the present invention is thinner than that of the piezoelectric stack 2, allowing the piezoelectric stack 2 to be elevated above the surface of the flat-mount fixture base plate 1. Specifically, after assembly, both the top and bottom surfaces of the piezoelectric stack 2 are 0.2 mm above the surface of the flat-mount fixture base plate 1. This allows for convenient cleaning of the top and bottom surfaces of the piezoelectric stack 2 using cleaning equipment and for attaching the strain gauge 12 and terminal strip 13 to these surfaces.
[0045] The utility model can meet the process requirements of large-scale production of strain gauges on both sides of piezoelectric stacks, can replace traditional manual patching, has the advantage of good process consistency, and improves the accuracy and efficiency of piezoelectric stack patching.
[0046] The above description is merely a preferred embodiment of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this disclosure.
[0047] Although the subject matter has been described in language specific to structural features and / or methodological logical acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are merely example forms of implementing the claims.
[0048] The above describes in detail multiple embodiments of the present disclosure, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should fall within the scope of protection required by the present disclosure.
Claims
1. A precision fixture for batch clamping of piezoelectric stack end faces, characterized in that: The invention comprises a flat fixture base plate (1), wherein a plurality of mounting grooves for placing the piezoelectric stack (2) are processed on the surface of the flat fixture base plate (1) according to the size of the piezoelectric stack (2), and a pressing guide block (3) is provided on the top of the mounting groove. The piezoelectric stack (2) is pressed by the flat fixture base plate (1) and the pressing guide block (3), and the pressing guide block (3) presses the piezoelectric stack (2) with elastic force.
2. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1 is characterized in that: The thickness of the flat-mounted jig base plate (1) is thinner than the thickness of the piezoelectric stack (2), and the piezoelectric stack (2) is higher than the surface of the flat-mounted jig base plate (1).
3. The precision jig for batch clamping of piezoelectric stack end faces according to claim 2 is characterized in that: After assembly, both the upper and lower surfaces of the piezoelectric stack (2) are 0.2 mm higher than the surface of the flat fixture bottom plate (1).
4. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1 is characterized in that: The mounting grooves processed on the flat fixture base plate (1) are all rectangular parallelepiped grooves that match the shape of the piezoelectric stack (2).
5. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1 or 4, characterized in that: The mounting grooves are arranged side by side on the same side of the surface of the flat-mounted fixture base plate (1).
6. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1 or 4, characterized in that: The flat fixture base plate (1) is processed at the bottom of the processing installation groove position, and two first buried wire grooves (8) and second buried wire grooves (9) are respectively processed for leading out the positive and negative electrode leads of the piezoelectric stack (2).
7. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1, characterized in that: A top rubber (4) is provided at the top of the pressing guide block (3), and a bottom rubber (5) is provided in the mounting groove; When the piezoelectric stack (2) is pressed by cooperating with the flat fixture bottom plate (1) and the pressing guide block (3), the two end faces of the piezoelectric stack (2) are contacted through the top rubber (4) and the bottom rubber (5).
8. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1, characterized in that: A spring (6) is provided at the bottom end of the pressing guide block (3), and under the elastic force of the spring (6), the pressing guide block (3) presses the piezoelectric stack (2).
9. The precision jig for batch clamping of piezoelectric stack end faces according to claim 8, characterized in that: It also includes a pressing guide block base plate (10) spliced with the flat fixture base plate (1), the surface of the pressing guide block base plate (10) is processed with a slide groove for the pressing guide block (3) to move relative to the piezoelectric stack (2), the spring (6) is arranged inside the slide groove, and a pressing cylindrical handle (7) is provided from the outside of the pressing guide block base plate (10) to pass through the spring (6) inward and connect with the bottom end of the pressing guide block (3).
10. The precision jig for batch clamping of piezoelectric stack end faces according to claim 1, characterized in that: The flat-mounted jig base plate (1) is integrally processed from an aluminum plate, and a jig base plate air-avoiding groove (11) is processed at the center of the surface of the flat-mounted jig base plate (1).