Graphene heat-conducting film coating device

Abstract

The utility model relates to functional membrane material preparation equipment technical field, concretely relates to a kind of graphene heat-conducting film coating device, it includes: rectangular frame, the both ends of rectangular frame are respectively equipped with loading frame, two groups of loading frame are respectively equipped with cloth release rotary roller and cloth collection rotary roller, the middle part of rectangular frame is equipped with mounting column, connecting rod is installed between the sidewall of loading frame and the upper portion of mounting column, the top of mounting column is equipped with material reservoir box, the top of rectangular frame is equipped with film tape, and the top of rectangular frame is equipped with coating assembly applied to the material coating of film tape, the utility model is to propose a kind of graphene heat-conducting film coating device, to solve the problem of film tape offset, tension instability and coating uneven in existing coating device.

Description

Technical Field

[0001] This utility model relates to the technical field of functional membrane material preparation equipment, and in particular to a graphene thermal conductive film tape device. Background Technology

[0002] Currently, with the continuous development of electronic devices towards higher power and higher integration, heat dissipation has become a major bottleneck restricting device performance and reliability. As an emerging high-performance heat dissipation material, graphene thermal conductive film is attracting increasing attention due to its excellent planar thermal conductivity, superior flexibility, and thinness. Fabricating graphene slurry into continuous roll-to-roll thermal conductive films through coating can significantly improve heat dissipation efficiency and meet the demands of chip, heat sink, and flexible electronic device industries for large-scale, thin, and roll-to-roll production of thermal conductive films.

[0003] In existing technologies, continuous processes such as film application, drying, and winding of graphene material slurry on a substrate are attempted. However, the tension control and film direction correction structures in the film application stage are imperfect, leading to easy deviation, wrinkling, or curling of the film during the unloading, coating, and winding processes. The coating structure lacks structures for residual slurry discharge, scraper recovery, and uniform distribution, sometimes resulting in uneven coating thickness and poor slurry return. In the section before winding after coating, there is a lack of effective mechanical tensioning and correction devices, making it difficult to stabilize the film tension and direction through simple mechanical means, resulting in poor practicality. Therefore, this utility model discloses a graphene thermal conductive film application device to solve the problems of film deviation, unstable tension, and uneven coating in existing film application devices. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a graphene thermal conductive film coating device to solve the problems of film belt misalignment, unstable tension and uneven coating in existing film belt devices.

[0005] To achieve the above objectives, this utility model provides a graphene thermally conductive film strip device, comprising: a rectangular frame, loading frames installed at both ends of the rectangular frame, a feeding rotating roller and a receiving rotating roller respectively installed on the two sets of loading frames, a mounting column in the middle of the rectangular frame, a connecting rod installed between the loading frame and the upper side wall of the mounting column, a material storage box at the top of the mounting column, a film strip directly above the rectangular frame, and a coating assembly for coating the film strip with material above the rectangular frame.

[0006] Preferably, the coating assembly includes a tensioning structure and a coating structure, the coating structure being located on the upper part of the mounting post, and the tensioning structure being located on both sides of the coating structure.

[0007] Preferably, the coating structure includes an upper coating roller and a lower coating roller. The two ends of the upper coating roller are mounted on the side wall of the mounting column via a first rotating roller. The lower coating roller is mounted on the side wall of the mounting column below the upper coating roller, and a gap is left between the upper coating roller and the lower coating roller. A feed pipe is installed below the material storage tank at a position above the upper coating roller. The other end of the feed pipe is attached to the outer wall of the upper coating roller. A guide groove is provided below the lower coating roller. One end of the guide groove is fixedly mounted on the side wall of the mounting column, and a scraper is installed at the bottom of the inner cavity of the guide groove. The other end of the scraper is attached to the outer wall of the lower coating roller, and the bottom of the scraper is sloped. The slope of the guide groove forms an angle α (α=10°-20°) with the horizontal plane for directional slurry return. A collection box is provided on the side wall of the mounting column at the lower end of the slope, and the upper end face of the collection box is open.

[0008] Preferably, the tensioning structure includes two sets of rotating rods, with each set of rotating rods having its two ends fixedly mounted on the connecting rod. Each connecting rod has a mounting bracket fixedly mounted on its two ends. The other ends of both sets of mounting brackets are rotatably mounted on a tensioning roller. A mechanical guide wheel is mounted on one side of the tensioning roller. A first mounting block is provided on the outer wall of one end of the mounting bracket located on the tensioning roller. A second mounting block is provided on the upper bottom surface of the rectangular frame. A telescopic rod is mounted on both the first and second mounting blocks, and a spring is sleeved on the telescopic rod.

[0009] Preferably, one end of the take-up rotating roller extends through and protrudes from the outer wall of the loading frame, and the end of the take-up rotating roller protruding from the outer wall of the loading frame is provided with a first servo motor, and the output end of the first servo motor is connected to the take-up rotating roller by a first chain for rotational transmission.

[0010] Preferably, one end of the upper coating roller extends through and protrudes from the upper outer wall of the mounting column, and the end of the upper coating roller protruding from the outer wall of the mounting column is provided with a second servo motor, and the output end of the second servo motor is connected to the upper coating roller by a second chain for rotational transmission.

[0011] Preferably, the feed pipe is connected to the interior of the material storage tank, and the feed pipe is equipped with a switch valve.

[0012] Preferably, one end of the telescopic rod is fixedly installed on the side wall of the first mounting block, and the other end of the telescopic rod is fixedly installed on the side wall of the second mounting block.

[0013] Preferably, one end of the film strip is connected to the fabric feeding rotating roller, and the other end of the film strip is connected to the fabric taking-up rotating roller. The film strip is located on the outer wall below the tension roller at one end of the fabric feeding rotating roller. The film strip is located in the middle of the rectangular frame between the upper coating roller and the lower coating roller, and the film strip is located on the outer wall below the tension roller at one end of the fabric taking-up rotating roller.

[0014] The beneficial effects of this utility model are:

[0015] A stable support structure, consisting of a feeding roller, a take-up roller, mounting columns, and connecting rods integrated on a rectangular frame, ensures the membrane maintains a stable orientation throughout the feeding, coating, and winding process. The material storage tank and feed pipe located on the upper part of the mounting columns, in conjunction with the feed pipe, allow for uniform delivery of graphene slurry to the outer wall of the upper coating roller, improving the continuous thickness of the membrane material supply. The coating gap between the upper and lower coating rollers enables relatively uniform coating of the thermally conductive film surface, while the guide channel and scraper structure below effectively collect excess slurry, preventing residue and waste. The scraper is tilted at the bottom and connected to the collection box, realizing automatic return and centralized recycling of residual slurry. Each module is integrated through a mechanical path, and the spring preload and servo response work together to effectively buffer traction fluctuations and improve coating uniformity. The example shows that the coating thickness variance is <0.1μm. The tensioning structure set on both sides consists of a mounting frame, rotating rod, tensioning roller and telescopic rod, and spring. It can provide continuous and stable mechanical tension compensation during the roll material conveying process, preventing the membrane from shifting, wrinkling or loosening, thereby improving the stability and uniformity of the membrane belt operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of part of the present utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of part of the present utility model;

[0020] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0021] The diagram is marked as follows:

[0022] 1. Rectangular frame; 2. Mounting column; 3. Material storage tank; 4. Connecting rod; 5. Membrane belt; 6. Fabric feeding roller; 7. Fabric taking-up roller; 8. Upper coating roller; 9. Lower coating roller; 10. Mounting frame; 11. Rotating rod; 12. Tensioning roller; 13. First mounting block; 14. Telescopic rod; 15. Spring; 16. Second mounting block; 17. Collection box; 18. Guide channel; 19. Scraper; 20. Feeding pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] This utility model provides, for example Figures 1 to 4 The graphene thermal conductive film coating device shown includes: a rectangular frame 1, with loading racks installed at both ends of the rectangular frame 1, and a feeding roller 6 and a receiving roller 7 respectively installed on the two loading racks; a mounting column 2 is provided in the middle of the rectangular frame 1; a connecting rod 4 is installed between the loading rack and the upper side wall of the mounting column 2; a material storage box 3 is provided at the top of the mounting column 2; a film strip 5 is provided directly above the rectangular frame 1; and a coating assembly for coating the film strip 5 with material is provided above the rectangular frame 1. The coating assembly includes a tensioning structure and a coating structure. The coating structure is located above the mounting column 2, and the tensioning structure is located on both sides of the coating structure.

[0026] After the equipment is started, the feeding roller 6 smoothly releases the thermally conductive film substrate at a set linear speed, and the base film is conveyed along the upper path of the rectangular frame 1 towards the receiving direction. The film belt 5 first passes through the tensioning structure located at one end. The tensioning structure, through the rotational support formed between the connecting rod 4 and the mounting frame 10, applies a constant tension to the film belt 5 using the elastic force of the tensioning roller 12, spring 15, and telescopic rod 14, thereby keeping the film belt 5 flat and preventing slack throughout the entire operation. Subsequently, the film belt 5 enters the upper area of ​​the mounting column 2, where the graphene slurry is uniformly coated through the gap between the upper coating roller 8 and the lower coating roller 9. At this time, the graphene slurry in the material storage tank 3 flows into the outer wall surface of the upper coating roller 8 by gravity through the feed pipe, and is uniformly carried out by the rotation of the upper coating roller 8, working together with the lower coating roller 9 to form a uniform film belt 5. Through the pressing action of the upper coating roller 8 and the lower coating roller 9, the slurry is fully spread on the film belt 5, improving the density and smoothness of the coating and preventing streaks, missed coatings, and local accumulation. After coating, the film belt 5 continues to the tensioning structure on the other side. The tensioning structure further corrects the tension and direction of the film belt 5 through a constant force mechanism, ensuring that the film behind the film belt 5 remains straight before winding, preventing wrinkles or adhesion caused by incomplete drying of the slurry. Finally, the thermal conductive film behind the film belt 5 is evenly wound into a roll by the take-up rotating roller 7 under a small tension fluctuation range, providing good initial flatness for subsequent drying and cutting processes. The entire workflow achieves automated film belt process through a continuous mechanical path of unwinding-tensioning-coating-re-tensioning-winding, realizing stable mechanical tension and uniform coating control without the need for a complex electronic tension feedback system, thus improving the preparation efficiency and finished product quality of the thermal conductive film.

[0027] Furthermore, in this example, such as Figure 2 , Figure 3 and Figure 4As shown, the coating structure includes an upper coating roller 8 and a lower coating roller 9. The two ends of the upper coating roller 8 are mounted on the side wall of the mounting column 2 via a first rotating roller. The lower coating roller 9 is mounted on the side wall of the mounting column 2 below the upper coating roller 8, with a gap between them. A feed pipe 20 is installed below the material storage tank 3, corresponding to the position above the upper coating roller 8. The other end of the feed pipe 20 is attached to the outer wall of the upper coating roller 8. A guide groove 18 is provided below the lower coating roller 9. One end of the guide groove 18 is fixedly mounted on the side wall of the mounting column 2, and a scraper 19 is installed at the bottom of the inner cavity of the guide groove 18. The other end of the scraper 19 is attached to the outer wall of the lower coating roller 9, and the bottom of the scraper 19 is sloped. The slope of the guide groove 18 is perpendicular to the horizontal plane. Angle α (α=10°-20°) is used for directional return of slurry. A collection box 17 is provided on the side wall of the column 2 at the lower end of the slope. The upper end face of the collection box 17 is open. The tensioning structure includes two sets of rotating rods 11. The two ends of each set of rotating rods 11 are fixedly installed on the connecting rod 4. The two ends of the connecting rod 4 are fixedly installed with mounting brackets 10. The other ends of the two sets of mounting brackets 10 are rotatably installed with tension rollers 12. A mechanical guide wheel is installed on one side of the tension roller 12. A first mounting block 13 is provided on the outer wall of the mounting bracket 10 at one end of the tension roller 12. A second mounting block 16 is provided on the upper bottom face of the rectangular frame 1. A telescopic rod 14 is installed on the first mounting block 13 and the second mounting block 16. A spring 15 is sleeved on the telescopic rod 14.

[0028] During equipment operation, the graphene slurry is first gravity-fed from the material storage tank 3 to the outer surface of the upper coating roller 8 via the feed pipe 20, where it is evenly distributed under the rotation of the roller. Meanwhile, the thermally conductive film substrate released by the dispensing rotating roller 6 enters the coating structure area from one side and passes through the gap between the upper coating roller 8 and the lower coating roller 9 along a predetermined path. As the film belt passes between the two rollers, the slurry adhering to the surface of the upper roller is evenly transferred and spread onto the surface of the film belt 5 under mechanical pressure and shear force, forming a preliminary coating. Excess slurry flows back into the guide groove 18 through the lower edge of the roller surface. The bottom arc of the guide groove 18 is such that the radius of the arc is R=50-100mm and the wedge angle of the scraper 19 is such that it is 15°-30°. Experiments have verified that this can reduce slurry eddies. As the roller rotates, the scraper 19 continuously scrapes off the residual slurry on the surface of the lower roller. The scraped slurry slides into the collection box 17 for reuse, thus forming a closed-loop working cycle of automatic feeding, uniform spreading, and residual material recycling. At the same time, the film belt 5 is subjected to the tensioning structure before and after passing through the coating area. Each tensioning structure forms a constant force loading mechanism through the telescopic rod 14 and the spring 15, so that the tensioning roller 12 generates a continuous and uniform tension on the film belt. The mechanical guide wheel can slightly constrain the edge of the film belt 5, which passively limits and corrects the deviation of the film belt 5. When the membrane belt 5 experiences tension fluctuations due to coating resistance or changes in winding speed, the telescopic rod 14 can automatically compensate through the elastic deformation of the spring 15, restoring the tension of the membrane belt 5 to balance and preventing slack or overstretching. By limiting the slope angle of the guide channel to between 10° and 20°, it is ensured that the residual slurry can smoothly slide into the collection box under the action of gravity. Too small an angle can easily lead to slurry retention, while too large an angle can easily cause splashing. This angle range is the ideal balance point for achieving efficient and clean recycling.

[0029] Furthermore, in this example, such as Figure 2 and Figure 3As shown, one end of the take-up rotating roller 7 penetrates and protrudes from the outer wall of the loading frame, and a first servo motor is provided at the end of the take-up rotating roller 7 protruding from the outer wall of the loading frame. The output end of the first servo motor is connected to the take-up rotating roller 7 by a first chain for rotational transmission. One end of the upper coating roller 8 penetrates and protrudes from the upper outer wall of the mounting column 2, and a second servo motor is provided at the end of the upper coating roller 8 protruding from the outer wall of the mounting column 2. The output end of the second servo motor is connected to the upper coating roller 8 by a second chain for rotational transmission. The feed pipe 20 is connected to the interior of the material storage box 3. The feed pipe 20 is connected and has a switch valve. One end of the telescopic rod 14 is fixedly installed on the side wall of the first mounting block 13, and the other end of the telescopic rod 14 is fixedly installed on the side wall of the second mounting block 16. One end of the film belt 5 is connected to the feed roller 6, and the other end of the film belt 5 is connected to the take-up roller 7. The film belt 5 is located on the outer wall below the tension roller 12 at one end of the feed roller 6. The film belt 5 is located in the middle of the rectangular frame 1 between the upper coating roller 8 and the lower coating roller 9, and the film belt 5 is located on the outer wall below the tension roller 12 at one end of the take-up roller 7.

[0030] During operation, the operator first fixes the graphene thermally conductive film base belt 5 onto the feeding roller 6 and connects the other end to the receiving roller 7. After the device is started, the first servo motor drives the receiving roller 7 to rotate slowly via the first chain, and the base belt at the feeding roller 6 end is smoothly pulled and unfolded. At the same time, the upper coating roller 8 starts to rotate synchronously under the drive of the second servo motor. The graphene slurry in the material storage tank 3 flows continuously to the outer wall of the upper roller through the feed pipe 20 and forms a uniform slurry layer during the rotation of the upper roller. The film belt 5 enters the gap area between the upper coating roller 8 and the lower coating roller 9 under the guidance of the tension roller 12. When passing through this area, the slurry is uniformly coated onto the surface of the film belt 5 under the action of roller surface pressure, completing one uniform film formation operation. Excess slurry flows back to the guide trough 18 and enters the collection box 17 under the rotation of the roller body, forming a closed-loop material supply and recycling system. At this time, the telescopic rod 14 and spring 15 in the tensioning structure automatically adjust the tension, so that the film belt 5 maintains relative tension throughout the entire running path, thereby preventing deviation and wrinkles caused by changes in winding speed and film belt thickness.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0032] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A graphene thermally conductive film coating device, characterized in that, include: A rectangular frame (1) is provided with loading racks at both ends. The two sets of loading racks are respectively provided with a cloth feeding roller (6) and a cloth receiving roller (7). A mounting column (2) is provided in the middle of the rectangular frame (1). A connecting rod (4) is installed between the loading rack and the upper side wall of the mounting column (2). A material storage box (3) is provided at the top of the mounting column (2). A membrane strip (5) is provided directly above the rectangular frame (1). A coating assembly for coating the membrane strip (5) is provided above the rectangular frame (1).

2. The graphene heat-conducting film coating device according to claim 1, wherein The coating assembly includes a tensioning structure and a coating structure, wherein the coating structure is located on the upper part of the mounting post (2) and the tensioning structure is located on both sides of the coating structure.

3. The graphene thermally conductive film coating device according to claim 2, characterized in that, The coating structure includes an upper coating roller (8) and a lower coating roller (9). The two ends of the upper coating roller (8) are mounted on the side wall of the mounting column (2) via a first rotating roller. The lower coating roller (9) is mounted on the side wall of the mounting column (2) below the upper coating roller (8), with a gap between the upper coating roller (8) and the lower coating roller (9). A feed pipe (20) is installed below the material storage tank (3) at a position above the upper coating roller (8). The other end of the feed pipe (20) is attached to the outer wall of the upper coating roller (8). The lower coating roller (9)... Below the coating roller (9) is a guide groove (18). One end of the guide groove (18) is fixedly installed on the side wall of the mounting column (2). A scraper (19) is installed at the bottom of the inner cavity of the guide groove (18). The other end of the scraper (19) is attached to the outer wall of the lower coating roller (9). The bottom of the scraper (19) is sloping. The slope of the guide groove (18) forms an angle α (α=10°-20°) with the horizontal plane for directional return of slurry. A collection box (17) is provided on the side wall of the mounting column (2) at the lower end of the slope. The upper end of the collection box (17) is open.

4. The graphene thermally conductive film coating device according to claim 3, characterized in that, The tensioning structure includes two sets of rotating rods (11). The two ends of each set of rotating rods (11) are fixedly installed on the connecting rod (4). The two ends of the connecting rod (4) are fixedly installed with mounting brackets (10). The other ends of the two sets of mounting brackets (10) are rotatably installed with tension rollers (12). A mechanical guide wheel is installed on one side of the tension roller (12). The mounting bracket (10) is provided with a first mounting block (13) on the outer wall of one end of the tension roller (12). The bottom upper surface of the rectangular frame (1) is provided with a second mounting block (16). The first mounting block (13) and the second mounting block (16) are jointly installed with a telescopic rod (14). A spring (15) is sleeved on the telescopic rod (14).

5. The graphene thermally conductive film coating device according to claim 4, characterized in that, One end of the take-up rotating roller (7) extends through and protrudes from the outer wall of the loading frame, and the end of the take-up rotating roller (7) protruding from the outer wall of the loading frame is provided with a first servo motor. The output end of the first servo motor is connected to the take-up rotating roller (7) by a first chain for rotational transmission.

6. The graphene thermally conductive film coating device according to claim 5, characterized in that, One end of the upper coating roller (8) extends through and protrudes from the upper outer wall of the mounting post (2), and the end of the upper coating roller (8) protruding from the outer wall of the mounting post (2) is provided with a second servo motor. The output end of the second servo motor is connected to the upper coating roller (8) by a second chain for rotational transmission.

7. The graphene thermally conductive film coating device according to claim 6, characterized in that, The feed pipe (20) is connected to the interior of the material storage tank (3), and the feed pipe (20) is equipped with a switch valve.

8. The graphene thermally conductive film coating device according to claim 7, characterized in that, One end of the telescopic rod (14) is fixedly installed on the side wall of the first mounting block (13), and the other end of the telescopic rod (14) is fixedly installed on the side wall of the second mounting block (16).

9. The graphene thermally conductive film coating device according to claim 8, characterized in that, One end of the film strip (5) is connected to the fabric feeding roller (6), and the other end of the film strip (5) is connected to the fabric taking-up roller (7). The film strip (5) is located on the outer wall below the tension roller (12) at one end of the fabric feeding roller (6). The film strip (5) is located in the middle of the rectangular frame (1) between the upper coating roller (8) and the lower coating roller (9), and the film strip (5) is located on the outer wall below the tension roller (12) at one end of the fabric taking-up roller (7).

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