Positioning device suitable for graphene composite layer

Abstract

The utility model discloses a positioning device suitable for a graphene composite layer, relates to the field of graphene processing equipment, and aims at solving the problem that in the prior art, in the welding process of graphene and copper foil, due to inaccurate positioning, dislocation is likely to happen, and accurate coating cannot be achieved. The graphene composite layer comprises a first copper plate, a second copper plate, a graphene layer and a copper frame, a welding cavity used for wrapping the graphene layer is defined by the copper frame, the first copper plate and the second copper plate, and the outer wall of the graphene layer abuts against the cavity wall of the welding cavity; the positioning device comprises a base and a plurality of positioning columns movably connected to the base, a limiting area used for containing the graphene composite layer is defined by the multiple positioning columns and the base, the multiple positioning columns evenly abut against the side wall of the graphene composite layer in the circumferential direction of the side wall of the graphene composite layer, and the multiple positioning columns are used for being matched with a pressing plate for diffusion welding. Therefore, the plurality of positioning columns move along with the extrusion of the pressing plate.

Description

Technical Field

[0001] This application relates to the field of graphene processing equipment, and specifically relates to a positioning device suitable for graphene composite layers. Background Art

[0002] As a new material, graphene has received extensive attention in various application fields due to its excellent thermal conductivity and mechanical properties. In practical applications, graphene materials usually exhibit a multi-layer structure. Since the binding force between single-layer graphene layers is relatively low, delamination problems are likely to occur. Especially when bent or subjected to mechanical stress, gaps will be generated between graphene layers, resulting in the formation of an air layer, which in turn leads to a large contact thermal resistance and seriously weakens the thermal conductivity of the material.

[0003] To solve this problem, the prior art has proposed a solution of coating the outer layer with copper material and performing diffusion welding. Through the vacuum diffusion welding process, under the action of vacuum, high temperature and pressure, a firm bond is formed between graphene and copper material (copper plate). However, in actual operation, during the pressurization of graphene and copper material by a vacuum diffusion welding device, due to the gaps between the welding tooling and components, uneven force, and thermal expansion effects, etc., the components may generate small lateral displacements, which in turn lead to misalignment between the upper and lower surfaces. In particular, the misalignment of the upper and lower surfaces of graphene and the copper plate will cause graphene to not be completely coated by copper, thereby affecting the stability and thermal conductivity of the overall structure. Summary of the Utility Model

[0004] Therefore, this application provides a positioning device suitable for graphene composite layers to solve the problem in the prior art that during the welding process of graphene and copper foil, misalignment is likely to occur due to inaccurate positioning, resulting in the inability to achieve precise coating.

[0005] To achieve the above object, this application provides the following technical solutions:

[0006] A positioning device suitable for a graphene composite layer, the graphene composite layer comprising a first copper plate, a second copper plate, a graphene layer disposed between the first copper plate and the second copper plate, and a copper frame disposed between the first copper plate and the second copper plate. The copper frame, the first copper plate, and the second copper plate enclose a welding cavity for wrapping the graphene layer, and the outer wall of the graphene layer abuts against the cavity wall of the welding cavity. The outer side wall of the copper frame, the side wall of the first copper plate, and the side wall of the second copper plate are aligned to form the side wall of the graphene composite layer. The positioning device includes a base and a plurality of positioning posts movably connected to the base. The plurality of positioning posts and the base enclose a limiting area for placing the graphene composite layer, and the plurality of positioning posts uniformly abut against the side wall of the graphene composite layer along the circumferential direction of the side wall of the graphene composite. The plurality of positioning posts are used to cooperate with the pressing plate of a diffusion welding device so that the plurality of positioning posts move as the pressing plate is pressed.

[0007] Optionally, a plurality of positioning grooves for embedding the positioning posts are formed on the top surface of the base. The plurality of positioning grooves correspond to the plurality of positioning posts one by one. The outer peripheral wall of the positioning post is in clearance fit with the groove wall of the positioning groove. A reset elastic member is disposed between the positioning post and the bottom of the positioning groove. One end of the positioning post away from the reset elastic member extends out of the positioning groove, and the end faces of the extending ends of the plurality of positioning posts are flush with each other.

[0008] Optionally, the reset elastic member is a high-temperature and high-strength spring.

[0009] Optionally, there are a plurality of graphene layers, and the plurality of graphene layers are stacked in the welding cavity and are parallel to the first copper plate and the second copper plate.

[0010] Optionally, the graphene composite layer is a cuboid. The horizontal cross-sections of the first copper plate and the second copper plate are both rectangles with the same size. The outer contour of the copper frame is a rectangle with the same size as that of the first copper plate or the second copper plate. The plurality of positioning posts are uniformly distributed on the four side walls of the cuboid.

[0011] Compared with the prior art, the present application has at least the following beneficial effects:

[0012] Multiple positioning posts are arranged circumferentially around the side wall of the graphene composite layer and uniformly abut against its side wall to achieve circumferential limitation of the composite layer. When diffusion welding is carried out, the pressing plate of the diffusion welding device abuts against the tops of the multiple positioning posts, applying pressure to the positioning posts, and the positioning posts can move downward accordingly until the pressing plate presses the first copper plate or the second copper plate to weld the graphene composite layer. During this process, the multiple positioning posts always abut against the side wall of the graphene composite layer to ensure its stability during welding. The graphene layer is located in the welding cavity and is completely wrapped by the copper frame, the first copper plate and the second copper plate. The positioning posts ensure that during the entire process of pressure welding, the side walls of the copper frame are always aligned with the side walls of the first copper plate and the second copper plate, thereby achieving complete wrapping and precise welding of the graphene layer, avoiding misalignment or deviation during the welding process, and ensuring the thermal conductivity and structural stability of the composite material. Description of the Drawings

[0013] To more intuitively illustrate the prior art and this application, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings are generally not regarded as limiting conditions when implementing this application; for example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / removal / attribution division, specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. of some units (components) based on the technical concept disclosed in this application and the exemplary drawings.

[0014] Figure 1 Schematic diagram of the mating structure of the graphene composite layer and the positioning device provided in an embodiment of this application;

[0015] Figure 2 Schematic diagram of the structure of the positioning device provided in an embodiment of this application;

[0016] Figure 3 For Figure 2 Partial cross-sectional view of the structure along the a-a direction;

[0017] Figure 4 Schematic diagram of the mating structure of the pressing plate of the diffusion welding device, the positioning device and the graphene composite layer provided in an embodiment of this application;

[0018] Figure 5 Schematic diagram of the structure of the graphene composite layer provided in an embodiment of this application;

[0019] Figure 6 For Figure 5 Enlarged view of part A;

[0020] Figure 7 For Figure 5 Exploded view.

[0021] Description of the reference numerals:

[0022] 1. Graphene composite layer; 11. First copper plate; 12. Second copper plate; 13. Copper frame; 14. Graphene layer; 2. Base; 21. Positioning groove; 3. Positioning post; 4. Limiting area; 5. Reset elastic member; 6. Pressing plate. Detailed implementation manner

[0023] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] Reference Figure 1-7 In the description of the present application: Unless otherwise specified, the meaning of "a plurality" is two or more. Terms such as "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to and do not have special significance in terms of technical connotation (for example, it should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.). Figure 4 The thick arrow indicates the direction in which the pressing plate exerts pressure.

[0025] The present application discloses a positioning device applicable to the graphene composite layer 1. The graphene composite layer 1 includes a first copper plate 11, a second copper plate 12, a graphene layer 14 arranged between the first copper plate 11 and the second copper plate 12, and a copper frame 13 arranged between the first copper plate 11 and the second copper plate 12. The copper frame 13, the first copper plate 11 and the second copper plate 12 enclose a welding cavity (not shown in the figure) for wrapping the graphene layer 14, and the outer wall of the graphene layer 14 abuts against the cavity wall of the welding cavity. The outer side wall of the copper frame 13, the side wall of the first copper plate 11 and the side wall of the second copper plate 12 are aligned to form the side wall of the graphene composite layer 1. The positioning device includes a base 2 and a plurality of positioning posts 3 movably connected to the base 2. The plurality of positioning posts 3 and the base 2 enclose a limiting area 4 for placing the graphene composite layer 1, and the plurality of positioning posts 3 are uniformly abutted against the side wall of the graphene composite along the circumferential direction of the side wall of the graphene composite. The plurality of positioning posts 3 are used to cooperate with the pressing plate 6 of a diffusion welding device (not shown in the figure) so that the plurality of positioning posts 3 move as the pressing plate 6 is pressed.

[0026] A plurality of positioning posts 3 are arranged circumferentially around the side wall of the graphene composite layer 1 and uniformly abut against its side wall to achieve circumferential limitation of the composite layer. When diffusion welding is carried out, the pressing plate 6 of the diffusion welding device abuts against the tops of the plurality of positioning posts 3, applying pressure to the positioning posts 3, and the positioning posts 3 can move downward accordingly until the pressing plate 6 presses the first copper plate 11 or the second copper plate 12 to weld the graphene composite layer 1. During this process, the plurality of positioning posts 3 always abut against the side wall of the graphene composite layer 1 to ensure its stability during welding. The graphene layer 14 is located in the welding cavity and is completely wrapped by the copper frame 13, the first copper plate 11 and the second copper plate 12. The positioning posts 3 ensure that the side walls of the copper frame 13 are always aligned with the side walls of the first copper plate 11 and the second copper plate 12 throughout the entire process of pressure welding, thereby achieving complete wrapping and precise welding of the graphene layer 14, avoiding misalignment or deviation during the welding process, and thus ensuring the thermal conductivity and structural stability of the composite material.

[0027] It should be noted that the diffusion welding device is a prior art. Common diffusion welding devices include vacuum diffusion welding machines, gas protection diffusion welding equipment, hydraulic pressure diffusion welding devices, etc. These devices usually apply a constant pressure under high temperature, vacuum or inert gas protection to make the distance between the atoms on the material surface enter the bonding range, so as to achieve welding without melting, eliminate surface micro-irregularities, and finally form a firm bond. This process eliminates oxides and contaminants at the interface, forms strong bonds between materials, and thus completes high-quality welding while maintaining the original material properties.

[0028] A plurality of positioning grooves 21 for embedding the positioning posts 3 are provided on the top surface of the base 2. The plurality of positioning grooves 21 correspond to the plurality of positioning posts 3 one by one. The outer peripheral wall of the positioning post 3 is in clearance fit with the groove wall of the positioning groove 21. A reset elastic member 5 is provided between the bottom of the positioning post 3 and the groove bottom of the positioning groove 21. One end of the positioning post 3 away from the reset elastic member 5 extends out of the positioning groove 21, and the end faces of the extending ends of the plurality of positioning posts 3 are flush with each other.

[0029] The outer peripheral wall of the positioning post 3 is in clearance fit with the groove wall of the positioning groove 21. This design can ensure that the positioning post 3 moves smoothly up and down during welding, avoiding jamming or poor movement due to excessive friction between the positioning post 3 and the groove wall. The positioning post 3 is connected to the groove bottom through the reset elastic member 5, and the reset elastic member 5 provides elastic force, enabling the positioning post 3 to reset after the external pressure is released. One end of the positioning post 3 away from the reset elastic member 5 extends out of the positioning groove 21, and the end faces of the extending ends are flush with each other. This design ensures that the plurality of positioning posts 3 are uniformly stressed during pressurization, so that the pressing plate 6 of the diffusion welding device can stably abut against the top surface of the graphene composite layer 1 (the first copper plate 11 or the second copper plate 12, depending on which copper plate is on the top).

[0030] In some embodiments, one end of the positioning post 3 away from the reset elastic member 5 extends out of the positioning groove 21 by 5 mm. Specifically, the extending distance can be adjusted according to the actual thickness of the welded graphene composite layer 1.

[0031] The reset elastic member 5 is a high-temperature and high-strength spring. The reset elastic member 5 is selected as a high-temperature and high-strength spring, which can provide a stable reset force in a high-temperature welding environment and maintain its structural and elastic properties under high-temperature conditions. The high-temperature and high-strength spring is a prior art and will not be elaborated in this application.

[0032] There are multiple graphene layers 14, and the multiple graphene layers 14 are stacked in the welding cavity and are parallel to the first copper plate 11 and the second copper plate 12. The number of graphene layers 14 can be adjusted according to specific application requirements and heat conduction performance requirements. Among them, the thickness of the copper frame 13 matches the number and total thickness of the graphene layers 14, so that the thickness of the graphene layers 14 is precisely aligned with the thickness of the copper frame 13, thereby ensuring the tight combination of the overall structure after welding. The multi-layer design with parallel arrangement makes the stress on each layer of graphene uniform during the welding process, avoiding problems such as local stress concentration or deformation.

[0033] The graphene composite layer 1 is a cuboid. The horizontal cross-sections of the first copper plate 11 and the second copper plate 12 are both rectangles with the same size. The outer contour of the copper frame 13 is a rectangle with the same size as that of the first copper plate 11 or the second copper plate 12. Multiple positioning posts 3 are evenly distributed on the four side walls of the cuboid.

[0034] In some embodiments, the thicknesses of the first copper plate 11 and the second copper plate 12 can be different, and can be specifically adjusted according to different heat conduction requirements, mechanical strengths, and application scenarios.

[0035] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered as within the scope described in this specification.

[0036] In the above text, the present application has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; but as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A positioning device applicable to a graphene composite layer, characterized in that, The graphene composite layer includes a first copper plate, a second copper plate, a graphene layer disposed between the first copper plate and the second copper plate, and a copper frame disposed between the first copper plate and the second copper plate. The copper frame, the first copper plate, and the second copper plate enclose a welding cavity for wrapping the graphene layer, and the outer wall of the graphene layer abuts against the cavity wall of the welding cavity. The outer side wall of the copper frame, the side wall of the first copper plate, and the side wall of the second copper plate are aligned to form the side wall of the graphene composite layer; The positioning device includes a base and a plurality of positioning columns movably connected to the base. The plurality of positioning columns and the base enclose a limiting area for placing the graphene composite layer, and the plurality of positioning columns uniformly abut against the side wall of the graphene composite layer along the circumferential direction of the side wall of the graphene composite. The plurality of positioning columns are used to cooperate with the pressing plate of the diffusion welding device so that the plurality of positioning columns move as the pressing plate is pressed.

2. The positioning device according to claim 1, wherein A plurality of positioning grooves for embedding the positioning columns are formed in the top surface of the base. The plurality of positioning grooves correspond to the plurality of positioning columns one by one. The outer peripheral wall of the positioning column is in clearance fit with the groove wall of the positioning groove. A reset elastic member is disposed between the positioning column and the bottom of the positioning groove. One end of the positioning column away from the reset elastic member extends out of the positioning groove, and the end faces of the extending ends of the plurality of positioning columns are flush with each other.

3. The positioning device according to claim 2, wherein The reset elastic member is a high-temperature and high-strength spring.

4. The positioning device according to claim 1, characterized in that, There are a plurality of graphene layers, and the plurality of graphene layers are stacked in the welding cavity and are parallel to the first copper plate and the second copper plate.

5. The positioning device according to claim 1 or 4, characterized in that, The graphene composite layer is a cuboid. The horizontal cross-sections of the first copper plate and the second copper plate are both rectangles with the same size. The outer contour of the copper frame is a rectangle with the same size as that of the first copper plate or the second copper plate. The plurality of positioning columns are uniformly distributed on the four side walls of the cuboid.

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