Graphite jig for producing synthetic graphite film

Abstract

This utility model discloses a graphite fixture, including a base plate, a top cover positioned directly above the base plate, a partition plate positioned between the base plate and the top cover, a vertically arranged graphite core for covering a PI roll film, and a graphite sleeve fitted over the PI roll film. The graphite sleeve has a first end and a second end. The first end has a first recessed annular groove arranged circumferentially around the graphite sleeve, forming a convex ring structure with a reduced outer diameter. The second end has a second recessed annular groove arranged circumferentially around the graphite sleeve to expand its inner diameter. The dimensions of the second recessed annular groove and the convex ring structure are matched. Through the cooperation of the convex ring structure and the second recessed annular groove, the first end of one graphite sleeve can be fitted together with the second end of another graphite sleeve. This graphite fixture can adapt to the mixed sintering of PI roll films of different widths, improves the reusability of graphite sleeves, and facilitates the stacking operation of graphite sleeves.

Description

Technical Field

[0001] This utility model relates to the field of synthetic graphite film production, and in particular to a graphite jig for producing synthetic graphite film. Background Technology

[0002] As is well known, graphite film (also known as graphite heat dissipation film or thermally conductive graphite sheet) is a high thermal conductivity nanocomposite material that is widely used in consumer electronics, communication equipment, new energy vehicles and other fields.

[0003] The process of PI roll film firing to produce artificial graphite involves the following steps: PI raw material slitting → PI unwinding → PI roll carbonization → graphitization → rewinding → calendering. This process is inseparable from the use of tooling fixtures.

[0004] However, in the use of existing tooling fixtures, the rolls are first unwound and placed on the graphite plate of the tooling fixture, then the graphite rod core is inserted, and then they are placed into the carbonization furnace and graphitization furnace in sequence for the corresponding carbonization and graphitization sintering processes. This makes the existing tooling fixtures unable to adapt to the mixed sintering of PI rolls of different widths.

[0005] Therefore, there is an urgent need for a graphite jig for producing synthetic graphite to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this invention is to provide a graphite fixture for producing synthetic graphite films, which is suitable for sintering PI rolls of different widths.

[0007] To achieve the above objectives, the graphite fixture for producing synthetic graphite films according to this utility model includes a base plate, a top cover positioned directly above the base plate, a partition plate positioned between the base plate and the top cover, a graphite core for vertically arranging and supplying a PI (polyimide) roll film, and a graphite sleeve for sleeved over the PI roll film. The graphite sleeve has a first end and a second end spaced axially apart. The first end has a first recessed annular groove arranged circumferentially around the graphite sleeve, which creates a convex ring structure with a reduced outer diameter. The second end has a second recessed annular groove arranged circumferentially around the graphite sleeve and used to expand the inner diameter of the second end. The dimensions of the second recessed annular groove and the convex ring structure are matched. Through the cooperation of the convex ring structure and the second recessed annular groove, the first end of one graphite sleeve is sleeved together with the second end of another graphite sleeve.

[0008] Compared with existing technologies, this invention utilizes a convex ring structure with a reduced outer diameter formed at the first end of the graphite sleeve and a second recessed ring groove on the second end of the graphite sleeve that matches the size of the convex ring structure. This allows the first end of one graphite sleeve to be fitted together with the second end of another graphite sleeve, improving the reusability of the graphite sleeve and facilitating the stacking operation between them. Furthermore, this invention's graphite fixture can be used for the mixed sintering of PI rolls with different widths (referring to the axial dimensions of the graphite sleeve), solving the problem of traditional fixtures being unable to adapt to the mixed sintering of PI rolls with different widths. In addition, by combining the intrinsic thermal and electrical conductivity of both the graphite sleeve and the graphite rod core, the graphite sleeve heats the PI roll from the outside while the graphite rod core heats it from the inside, ensuring uniform heating of each PI roll and thus improving the conversion rate of forming a homogeneous graphite film during the sintering process.

[0009] Preferably, a fixing groove is provided on the side wall of the graphite sleeve, which is arranged through the axial direction of the graphite sleeve. The fixing groove of the graphite sleeve is used to fix the outer end of the PI roll film.

[0010] Preferably, the first end is further provided with a positioning part, and the second end is provided with a fitting part that is aligned with the positioning part in the axial direction of the graphite sleeve; by means of the cooperation of the positioning part and the fitting part, the fixing grooves of the two graphite sleeves that are sleeved together are aligned in the axial direction of the graphite sleeve.

[0011] Preferably, the positioning part is located on the convex ring structure.

[0012] Preferably, the positioning part is a notch formed in the convex ring structure, and the fitting part is a partition structure that separates the second sinking ring groove.

[0013] Preferably, the fixing groove of the graphite sleeve is arranged through the graphite sleeve in the inner and outer directions, so that the graphite sleeve is an open ring in the circumferential direction.

[0014] Preferably, the graphite sleeves are respectively distributed between the base plate and the partition plate and between the partition plate and the top cover. The partition plate is supported above the base plate by the graphite sleeves located between the partition plate and the base plate, and the top cover is supported above the partition plate by the graphite sleeves located between the top cover and the partition plate.

[0015] Preferably, at least one of the base plate and the partition plate has a first positioning structure at one end facing each other for positioning the end of the corresponding graphite sleeve, and at least one of the partition plate and the top cover has a second positioning structure at one end facing each other for positioning the end of the corresponding graphite sleeve, and the first positioning structure and the second positioning structure are each arranged around the graphite rod core.

[0016] Preferably, both the first positioning structure and the second positioning structure are annular grooves.

[0017] Preferably, the center line of the annular groove coincides with the center line of the graphite rod core.

[0018] Preferably, a fixing groove is provided on the side wall of the graphite rod core, extending along the axial direction of the graphite rod core, and the fixing groove on the graphite rod core is used to fix the inner end of the PI roll film.

[0019] Preferably, the lower end of the graphite rod core is used for assembly connection with the base plate, the upper end of the graphite rod core is used for assembly connection with the top cover, and the graphite rod core is also used for passing through the partition; the position of the graphite rod core between the base plate and the partition and the position of the graphite rod core between the partition and the top cover are respectively for the PI roll film and the graphite sleeve outer sleeve to be arranged.

[0020] Preferably, the lower end of the graphite rod core is provided with a lower external thread structure, the bottom plate is provided with a lower internal thread assembly hole for threaded connection with the lower external thread structure; the top cover is provided with a through assembly hole for through assembly with the upper end of the graphite rod core; and the partition is provided with a through hole for the graphite rod core to pass through.

[0021] Preferably, the fixing groove of the graphite rod core extends downward to the lower end of the graphite rod core, and the fixing groove of the graphite rod core extends upward to the upper end of the graphite rod core. Attached Figure Description

[0022] Figure 1 This is a plan view of the graphite fixture used for producing synthetic graphite films according to the first embodiment of this utility model.

[0023] Figure 2 yes Figure 1 The diagram shows a graphite fixture with all graphite sleeves concealed.

[0024] Figure 3 This is a perspective view of the base plate and graphite rod core assembled together in the graphite fixture of the first embodiment of this utility model.

[0025] Figure 4 yes Figure 3 3D exploded view.

[0026] Figure 5 This is a perspective view of the top cover in the graphite fixture of the first embodiment of this utility model.

[0027] Figure 6 This is a perspective view of the partition in the graphite fixture of the first embodiment of this utility model.

[0028] Figure 7 yes Figure 6 The diagram shows the partition from another angle.

[0029] Figure 8 This is a plan view showing the assembled graphite rod core and graphite sleeve in the graphite fixture of the first embodiment of this utility model.

[0030] Figure 9 yes Figure 8 The diagram shows the internal structure of the graphite rod core and graphite sleeve after being cut by a plane perpendicular to the axis of the graphite rod core.

[0031] Figure 10 Is Figure 9 The image shows the state of the PI roll film after it has been fixed.

[0032] Figure 11 This is a plan view of the graphite rod core in the graphite fixture of the first embodiment of this utility model.

[0033] Figure 12 It is along Figure 11 Internal view of the section cut along the BB line.

[0034] Figure 13 This is a perspective view of the graphite sleeve in the graphite fixture of the first embodiment of this utility model.

[0035] Figure 14 yes Figure 13 The graphite sleeve shown is in a three-dimensional view at another angle.

[0036] Figure 15 yes Figure 13 The diagram shows a plan view of the graphite sleeve.

[0037] Figure 16 It shows a diagram of two graphite sleeves fitted together, one above the other.

[0038] Figure 17 This is a plan view of a graphite fixture used for producing synthetic graphite films according to the second embodiment of this utility model. Detailed Implementation

[0039] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0040] Please combine Figure 1 and Figure 10The graphite fixture 100 for producing synthetic graphite film in the first embodiment includes a base plate 10, a top cover 20 arranged directly above the base plate 10, a partition 30 arranged between the base plate 10 and the top cover 20, a graphite rod core 40 for vertical arrangement and for covering the PI roll film 200, and a graphite sleeve 50 for covering the PI roll film 200.

[0041] Among them, combined Figures 13 to 15 As an example, the graphite sleeve 50 has a first end 52 and a second end 53 spaced apart axially from each other. The first end 52 has a first recessed annular groove 521 arranged circumferentially around the graphite sleeve 50, which forms a convex ring structure 522 with a reduced outer diameter at the first end 52. The second end 53 has a second recessed annular groove 532 arranged circumferentially around the graphite sleeve 50 and used to expand the inner diameter of the second end 53. The dimensions of the second recessed annular groove 532 and the convex ring structure 522 are matched. Therefore, by means of the cooperation of the convex ring structure 522 and the second recessed annular groove 532, the first end 52 of one graphite sleeve 50 can be sleeved together with the second end 53 of another graphite sleeve 50, as shown in the diagram. Figure 16 As shown. Specifically, at Figures 13 to 15 As an example, a fixing groove 511 is provided on the side wall 51 of the graphite sleeve 50, which is arranged through the axis of the graphite sleeve 50. The fixing groove 511 of the graphite sleeve 50 is used to fix the outer end 220 of the PI roll film 200. See the description below. Figure 10 As shown, this design ensures that the outer end 220 of the PI roll film 200 is fixed in the fixing groove 511 of the graphite sleeve 50 before sintering and is constrained by the graphite sleeve 50. This effectively reduces the irregular deformation of the PI roll film 200 during the sintering process and more effectively improves the conversion rate of the PI roll film 200 in forming a homogeneous graphite film during sintering. More specifically, see the description below.

[0042] like Figures 13 to 15 As shown, as an example, the first end 52 is also provided with a positioning part 523, and the second end 53 is provided with a fitting part 531 that is aligned with the positioning part 523 in the axial direction of the graphite sleeve 50. Therefore, by means of the cooperation of the positioning part 523 and the fitting part 531, the fixing grooves 511 of the two graphite sleeves 50 that are sleeved together are aligned in the axial direction of the graphite sleeves 50, as shown in the figure. Figure 16 As shown, when multiple graphite sleeves 50 are connected together, it is easier for the operator to fix the outer end 220 of the PI roll film 200 into the fixing groove 511 of all the connected graphite sleeves 50. Specifically, in Figure 13 In this configuration, the positioning portion 523 is located on the convex ring structure 522. Alternatively, as an example, the positioning portion 523 may be a notch formed in the convex ring structure 522. Figure 14In the middle, the positioning part 531 is a partition structure that separates the second sinking annular groove 532.

[0043] like Figures 13 to 15 As shown, as an example, the fixing groove 511 of the graphite sleeve 50 is also arranged through the graphite sleeve 50 in the inner and outer directions, so that the graphite sleeve 50 is an open ring in the circumferential direction. This design facilitates the manufacturing of the fixing groove 511 in the graphite sleeve 50, and makes it easier for the outer end 220 of the PI roll film 200 to be fixed in the fixing groove 511 of the graphite sleeve 50.

[0044] like Figure 1 As shown, as an example, graphite sleeves 50 are respectively arranged between the base plate 10 and the partition plate 30 and between the partition plate 30 and the top cover 20 to meet the requirement of a multi-layer arrangement where the PI roll film 200 and the graphite sleeves 50 are spaced apart axially from each other, thereby improving the capacity of the graphite fixture 100 of the first embodiment for the PI roll film 200 during a single use. Furthermore, in... Figure 1 As an example, the partition 30 is provided by means of a graphite sleeve 50 located between the partition 30 and the base plate 10 (e.g., Figure 1 The lowest graphite sleeve 50 is supported above the base plate 10, and the top cover 20 is supported by the graphite sleeve 50 located between the top cover 20 and the partition plate 30 (e.g., Figure 1 The uppermost graphite sleeve 50 is supported above the partition 30. Therefore, by using the graphite sleeve 50 as a support, the structure of the partition 30 being supported above the base plate 10 and the top cover 20 being supported above the partition 30 is simplified. This allows the lower end 41 of the graphite rod core 40 to be directly assembled and connected to the base plate 10 and the upper end 42 of the graphite rod core 40 to be directly assembled and connected to the top cover 20. This eliminates the need for additional screws and nuts when connecting the base plate, partition, and top cover together in the existing fixture. Since the screws are eliminated, more space is freed up for the PI roll film 200 and the graphite sleeve 50. On the other hand, the distance between the partition 30 and the base plate 10 and the distance between the partition 30 and the top cover 20 are controlled by the graphite sleeve 50.

[0045] like Figure 3 and Figure 4 As shown, as an example, the end of the base plate 10 facing the partition plate 30 is provided with an end for the corresponding graphite sleeve 50 (e.g. Figure 14 The first positioning structure 11, located at the second end 52, surrounds the graphite core 40. This first positioning structure 11 allows the graphite sleeve 50 to be quickly and reliably assembled onto the base plate 10, thereby improving the efficiency of assembling the graphite sleeve 50 onto the base plate 10. Additionally, as... Figure 6 As shown, as an example, the end of the partition 30 facing the top cover 20 is provided with an end for the corresponding graphite sleeve 50 (e.g. Figure 14The second positioning structure 31, located at the second end 52, surrounds the graphite rod core 40. This second positioning structure 31 allows the graphite sleeve 50 to be quickly and reliably assembled onto the partition plate 30, thereby improving the efficiency of assembling the graphite sleeve 50 onto the partition plate 30. Specifically, in... Figure 3 and Figure 4 In this example, the first positioning structure 11 is an annular groove, so that the base plate 10 can also constrain the graphite sleeve 50 from both the inner and outer sides, further improving the stability of the assembly between the graphite sleeve 50 and the base plate 10; additionally, in Figure 6 In this configuration, the second positioning structure 31 is also an annular groove, allowing the partition 30 to further constrain the graphite sleeve 50 from both its inner and outer sides, thereby improving the stability of the assembly between the graphite sleeve 50 and the partition 30. More specifically, as an example, the center line of the annular groove coincides with the center line of the graphite rod core 40 to ensure that the gaps 60 between the graphite sleeve 50 and the graphite rod core 40 are of consistent size, as shown in the diagram. Figure 8 and Figure 9 As shown. It should be noted that, although Figure 3 and Figure 4 The diagram shows that the bottom plate 10 has a first positioning structure 11 at the end facing the partition 30. Obviously, depending on actual needs, the first positioning structure 11 can also be provided at the end of the partition 30 facing the bottom plate 10, or at the ends of both the partition 30 and the bottom plate 10 facing each other. Therefore, it is not considered... Figure 3 and Figure 4 The above is for reference only. Also, although... Figure 6 The diagram shows that the partition 30 has a second positioning structure 31 at the end facing the top cover 20. Obviously, depending on actual needs, the second positioning structure 31 can also be provided at the end of the top cover 20 facing the partition 30, or at the ends of both the partition 30 and the top cover 20 facing each other. Therefore, it is not considered... Figure 6 The above is the limit.

[0046] like Figure 3 , Figure 4 , Figure 11 and Figure 12 As shown, as an example, a fixing groove 431 extending axially along the graphite core 40 is provided on the side wall 43 of the graphite core 40. The fixing groove 431 of the graphite core 40 is used to fix the inner end 210 of the PI roll film 200. (See attached image for details.) Figure 10 As shown; therefore, the inner end 210 of the PI roll film 200 is fixed by the fixing groove 431 of the graphite rod core 40, and the outer end 220 of the PI roll film 200 is fixed by the graphite sleeve 50, so that the PI roll film 200 can only be oriented axially during the sintering process, thus minimizing the irregular deformation of the PI roll film 200 during the sintering process. Furthermore, in Figure 2 In this example, the lower end 41 of the graphite rod core 40 is used for assembly connection with the base plate 10, optionally combined with... Figure 4 , Figure 11 and Figure 12 As an example, the lower end 41 of the graphite core 40 is provided with a lower external thread structure 411, and the base plate 10 is provided with a lower internal thread assembly hole 12 for threaded connection with the lower external thread structure 411. Therefore, the ease of assembly between the lower end 41 of the graphite core 40 and the base plate 10 is improved by the cooperation of the lower internal thread assembly hole 12 and the lower external thread structure 411. Obviously, depending on actual needs, the assembly connection method between the lower end 41 of the graphite core 40 and the base plate 10 can also be other methods well known in the art, so it is not considered as such. Figure 4 and Figure 11 The diagram shows a limited extent. The upper end 42 of the graphite rod core 40 is used for assembly connection with the top cover 20, and optionally, it is combined with... Figure 4 , Figure 11 and Figure 12 As an example, the top cover 20 has a through-hole 22 for fitting and assembling with the upper end 42 of the graphite rod core 40, so that the top cover 20 can be easily fitted onto the upper end 42 of the graphite rod core 40 by means of the through-hole 22. Obviously, depending on actual needs, the assembly connection between the upper end 42 of the graphite rod core 40 and the top cover 20 can also be other methods known in the art, so they are not used as examples. Figure 5 and Figure 11 The above is a limited description. Combined with... Figure 2 , Figure 6 and Figure 7 The graphite core 40 is also inserted into the partition 30, and optionally, it is placed in the partition 30. Figure 6 and Figure 7 As an example, the partition 30 has through holes 32, allowing it to be quickly fitted onto the graphite core 40. Therefore, by using a design where "the lower end 41 of the graphite core 40 is used for assembly with the base plate 10, the upper end 42 of the graphite core 40 is used for assembly with the top cover 20, and the graphite core 40 is also inserted into the partition 30," the assembly process is simplified and the number of graphite cores 40 is reduced, thus achieving cost savings. When the lower end 41 of the graphite rod core 40 is configured for assembly and connection with the base plate 10 and the upper end 42 of the graphite rod core 40 is configured for assembly and connection with the top cover 20, the positions of the graphite rod core 40 between the base plate 10 and the partition plate 30 and between the partition plate 30 and the top cover 20 are respectively provided for the outer sheath of the PI roll film 200 and the graphite sleeve 50, so as to meet the requirement that the PI roll film 200 and the graphite sleeve 50 are arranged in multiple layers spaced apart in the axial direction of the graphite rod core 40, thereby improving the capacity of the graphite fixture 100 of the first embodiment for the PI roll film 200 during a single use.

[0047] like Figure 3 , Figure 4 , Figure 11 and Figure 12 As shown, as an example, the fixing groove 431 of the graphite rod core 40 extends downward to the lower end 41 of the graphite rod core 40. Alternatively, it may be located at... Figure 11 and Figure 12 In this example, the fixing groove 431 of the graphite rod core 40 is also adjacent to the lower external thread structure 411; the fixing groove 431 of the graphite rod core 40 extends upward to the upper end 42 of the graphite rod core 40; this design facilitates the processing and fabrication of the fixing groove 431 on the graphite rod core 40, and also ensures that the inner end 210 of each layer of PI roll film 200 can be conveniently and reliably fixed in the fixing groove 431; alternatively, in Figure 3 , Figure 4 , Figure 11 and Figure 12 In this example, the upper end 42 of the graphite rod core 40 is provided with an upper external thread structure 421, so that the operator can connect the nut 70 to the upper external thread structure 421 by threading. The nut 70 can then apply a downward pushing force to the top cover 20, and with the graphite sleeve 50 providing axial support, the base plate 10, partition plate 30, and top cover 20 are locked together. At this time, the fixing groove 431 of the graphite rod core 40 is also arranged adjacent to the upper external thread structure 421. Furthermore, in... Figure 12 In the middle, the fixing groove 431 is connected to the axial center through hole 44 of the graphite rod core 40.

[0048] like Figure 1 and Figure 2 As shown in the figure, as an example, there are four partitions 30 spaced apart from each other axially in the graphite core 40. Obviously, the number of partitions 30 can be other than those required in practice, so it is not specified. Figure 1 and Figure 2 As shown, at this time, the graphite core 40 is positioned between two adjacent partitions 30, each providing an outer layer for a PI roll film 200 and a graphite sleeve 50, thereby increasing the number of layers of graphite sleeve 50 and PI roll film 200 in the axial direction of the graphite core 40. Specifically, in Figure 1 In one example, among two adjacent partitions 30, the upper partition 30 is supported above the lower partition 30 by means of a graphite sleeve 50 located between the two adjacent partitions 30. More specifically, in Figure 6 In the case of two or more partitions 30, the aforementioned second positioning structure 31 may be provided on the lower of two adjacent partitions 30. The second positioning structure 31 is used to face the upper of the two adjacent partitions 30 to improve the convenience of assembling the graphite sleeve 50 with the lower partition 30 in the two adjacent partitions 30.

[0049] like Figure 17As shown, the structure of the graphite jig 100' in the second embodiment is basically the same as that of the graphite jig 100 in the first embodiment. The only difference is that the bottom of the graphite jig 100' in the second embodiment consists of two graphite sleeves 50 that are nested together, and the number of partitions 30 used is reduced accordingly.

[0050] Compared with the prior art, by forming a convex ring structure 521 with a reduced outer diameter at the first end 52 of the graphite sleeve 50 and providing a second recessed ring groove 532 on the second end 53 of the graphite sleeve 50 that matches the size of the convex ring structure 521, the first end 52 of one graphite sleeve 50 can be sleeved together with the second end 53 of another graphite sleeve 50. This increases the reusability of the graphite sleeve 50 and makes the stacking operation between graphite sleeves 50 convenient. Furthermore, it makes the graphite fixture 100 (100') of this utility model applicable to different... The operation of sintering PI rolls 200 with wide widths (referring to the axial dimension of the graphite sleeve 50) solves the problem that traditional jigs cannot adapt to the sintering of PI rolls with different widths. In addition, by combining the intrinsic thermal and electrical conductivity properties of the graphite sleeve 50 and the graphite rod 40, the graphite sleeve 50 heats the PI roll 200 from the outside and the graphite rod 40 heats it from the inside, ensuring that each PI roll 200 is heated evenly, thereby improving the conversion rate of forming a homogeneous graphite film during the sintering process.

[0051] It should be noted that PI roll film 200 refers to a roll of polyimide film. Additionally, arrow A in the attached diagram indicates the axial direction of the graphite core 40 and the graphite sleeve 50.

[0052] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A graphite jig for producing a synthetic graphite film, comprising a base plate, a top cover for being disposed directly above the base plate, a partition plate for being disposed between the base plate and the top cover, a graphite rod core for being disposed vertically and for being covered by a PI film, and a graphite sleeve for being covered by the PI film, characterized in that, The graphite sleeve has a first end and a second end spaced apart axially from each other. The first end has a first recessed annular groove arranged circumferentially along the graphite sleeve, which forms a convex ring structure with a reduced outer diameter at the first end. The second end has a second recessed annular groove arranged circumferentially along the graphite sleeve and used to expand the inner diameter of the second end. The dimensions of the second recessed annular groove and the convex ring structure are matched. By means of the cooperation between the convex ring structure and the second recessed annular groove, the first end of one graphite sleeve is sleeved together with the second end of another graphite sleeve.

2. The graphite jig for producing a synthetic graphite film according to claim 1, characterized by A fixing groove is provided on the side wall of the graphite sleeve, which is arranged through the axis of the graphite sleeve. The fixing groove of the graphite sleeve is used to fix the outer end of the PI roll film.

3. The graphite fixture for producing synthetic graphite films according to claim 2, characterized in that, The first end is also provided with a positioning part, and the second end is provided with a fitting part that is aligned with the positioning part in the axial direction of the graphite sleeve; by means of the cooperation of the positioning part and the fitting part, the fixing grooves of the two graphite sleeves that are sleeved together are aligned in the axial direction of the graphite sleeve.

4. The graphite fixture for producing synthetic graphite films according to claim 3, characterized in that, The positioning part is located on the convex ring structure, the positioning part is a notch opened in the convex ring structure, and the fitting part is a partition structure that separates the second sinking ring groove.

5. The graphite fixture for producing synthetic graphite films according to claim 2, characterized in that, The fixing groove of the graphite sleeve is also arranged through the graphite sleeve in the inner and outer directions, so that the graphite sleeve is an open ring in the circumferential direction.

6. The graphite fixture for producing synthetic graphite films according to claim 1, characterized in that, The graphite sleeves are respectively distributed between the base plate and the partition and between the partition and the top cover. The partition is supported above the base plate by the graphite sleeves located between the partition and the base plate, and the top cover is supported above the partition by the graphite sleeves located between the top cover and the partition.

7. The graphite fixture for producing synthetic graphite films according to claim 6, characterized in that, At least one of the base plate and the partition plate has a first positioning structure at one end facing each other for positioning the end of the corresponding graphite sleeve, and at least one of the partition plate and the top cover has a second positioning structure at one end facing each other for positioning the end of the corresponding graphite sleeve. The first positioning structure and the second positioning structure are each arranged around the graphite rod core.

8. The graphite fixture for producing synthetic graphite films according to claim 7, characterized in that, Both the first positioning structure and the second positioning structure are annular grooves, and the center line of the annular groove coincides with the center line of the graphite rod core.

9. The graphite fixture for producing synthetic graphite films according to claim 1 or 6, characterized in that, A fixing groove is provided on the side wall of the graphite rod core, extending along the axial direction of the graphite rod core. The fixing groove on the graphite rod core is used to fix the inner end of the PI roll film.

10. The graphite fixture for producing synthetic graphite films according to claim 9, characterized in that, The lower end of the graphite rod core is used for assembly connection with the base plate, and the upper end of the graphite rod core is used for assembly connection with the top cover. The graphite rod core is also used to pass through the partition plate. The positions of the graphite rod core between the base plate and the partition plate and between the partition plate and the top cover are respectively for the PI roll film and the graphite sleeve to be arranged. The lower end of the graphite rod core is provided with a lower external thread structure, and the base plate is provided with a lower internal thread assembly hole for threaded connection with the lower external thread structure. The top cover is provided with a through assembly hole for assembly with the upper end of the graphite rod core. The partition plate is provided with a through hole for the graphite rod core to pass through. The fixing groove of the graphite rod core extends downward to the lower end of the graphite rod core and extends upward to the upper end of the graphite rod core.

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