Shaping jig

Abstract

The utility model discloses a shaping jig which comprises a cover plate assembly, a first column of stand column sets and a second column of stand column sets, the first face of the cover plate is provided with a plurality of columns of first column of stand column sets which are distributed at intervals in the first direction and are parallel to one another, and the second face of the cover plate is provided with a plurality of second column of stand column sets. A second column of stand column groups parallel to the first column of stand column groups are arranged between every two adjacent first column of stand column groups, and the second column of stand column groups are configured to slide relative to the cover plate in the second direction; the first column of stand column set comprises a plurality of first stand columns distributed at intervals in the second direction, and the second column of stand column set comprises a plurality of second stand columns distributed at intervals in the second direction. The base assembly is provided with a top opening and a containing cavity communicated with the top opening, the containing cavity is used for containing a graphite flake, and the two ends, in the first direction, of the graphite flake are fixed in the containing cavity; the first face of the cover plate covers the top opening of the base assembly so that the first column of stand column sets and the second column of stand column sets can enter the containing cavity.

Description

TECHNICAL FIELD

[0001] The utility model relates to graphite heat conduction sheet technical field, especially a shaping fixture. BACKGROUND

[0002] Graphite is a non-metallic mineral with good thermal conductivity, widely used in various fields, such as electronic power and energy storage and conversion equipment. Heat conduction sheet is a material for conducting heat, usually made of metal or alloy, which can effectively conduct heat generated by the device to avoid overheating.

[0003] The combination of graphite and heat conduction sheet is a common heat management solution that combines the high thermal conductivity of graphite and the excellent mechanical properties of heat conduction sheet to improve heat conduction efficiency. The existing graphite heat conduction sheet production process usually adopts the pressing forming method, that is, the heat conduction paste is placed on the graphite sheet, and the graphite heat conduction sheet with the required shape is formed by pressing. Although this method is simple to operate, the graphite sheet will displace during the pressing process with the heat conduction paste (the main reason is that the graphite sheet is composed of many small particles, which will rub and move against each other during the pressing process, especially under high pressure, the interaction between the particles will be more obvious, causing displacement of the graphite sheet during the pressing process), so the final graphite heat conduction sheet will have the following problems:

[0004] 1. Since the graphite sheet is a new heat dissipation material with uniform heat conduction in two directions, displacement of the graphite sheet during the pressing process with the heat conduction paste will block or change its heat conduction channel, reducing the thermal conductivity of the entire graphite heat conduction sheet.

[0005] 2. Displacement of the graphite sheet during the pressing process with the heat conduction paste may cause the graphite sheet and the heat conduction paste to not be in close contact, forming air gaps or interface thermal resistance, increasing the resistance to heat transfer, and further reducing the heat conduction effect of the entire graphite heat conduction sheet.

[0006] 3. Displacement of the graphite sheet during the pressing process with the heat conduction paste may also cause performance instability during use, such as local overheating, uneven heat dissipation, etc., affecting the reliability and service life of the graphite heat conduction sheet.

[0007] The utility model is used to solve at least one of the above technical problems. SUMMARY

[0008] The purpose of the utility model is to provide a shaping fixture that can realize batch stretching and shaping of graphite sheets, increasing the contact surface area of the graphite sheets.

[0009] The purpose of the utility model is achieved by adopting the following technical solutions:

[0010] The utility model provides a kind of shaping fixture, comprising:

[0011] Cover plate assembly, including cover plate, first column post group and second column post group, the cover plate has first surface, the first surface of the cover plate is provided with multiple first column post groups spaced apart and parallel to each other along the first direction, between the two adjacent first column post groups, a second column post group parallel to the first column post group is provided, the second column post group is configured to be able to slide relative to the cover plate along the second direction;

[0012] Wherein, the first direction and the second direction are perpendicular;

[0013] The first column post group includes multiple first columns spaced apart along the second direction, and the second column post group includes multiple second columns spaced apart along the second direction;

[0014] Base assembly has top opening and accommodating cavity communicated with the top opening, and the accommodating cavity is used for vertically placing at least one graphite sheet, and both ends of the graphite sheet along the first direction are fixed in the accommodating cavity;

[0015] The first surface of the cover plate covers the top opening of the base assembly, so that the first column post group and the second column post group enter the accommodating cavity.

[0016] In some possible embodiments, the first surface of the cover plate is provided with multiple grooves spaced apart and parallel to each other along the first direction, the grooves are located between the two adjacent first column post groups, each groove is slidingly connected with a sliding member, and a second column post group is correspondingly provided on each sliding member, and all the second columns in the second column post group are fixed on the corresponding sliding member.

[0017] In some possible embodiments, the base assembly includes:

[0018] Bottom plate has second surface opposite to the first surface of the cover plate;

[0019] Two side plates include first side plate and second side plate oppositely arranged on the second surface of the bottom plate along the second direction, and the first side plate and the second side plate are parallel to each other;

[0020] Two vertical plates include first vertical plate and second vertical plate oppositely arranged on the second surface of the bottom plate along the first direction, and the first vertical plate and the second vertical plate are parallel to each other;

[0021] Each side plate has first end and second end opposite along the first direction;

[0022] Each vertical plate has third end and fourth end opposite along the second direction.

[0023] The first end of the first side plate is connected to the third end of the first vertical plate, and the second end of the first side plate is connected to the third end of the second vertical plate; the first end of the second side plate is connected to the fourth end of the first vertical plate, and the second end of the second side plate is connected to the fourth end of the second vertical plate;

[0024] The two side plates and the two vertical plates form the top opening and surround the bottom plate to form a containing cavity in communication with the top opening;

[0025] The graphite sheet has a fifth end and a sixth end opposite along the length direction thereof, the fifth end of the graphite sheet is capable of being fixed on the first vertical plate, and the sixth end of the graphite sheet is capable of being fixed on the second vertical plate.

[0026] In some possible embodiments, a plurality of vertical openings are arranged on each of the two vertical plates and spaced apart along the second direction and parallel to each other, and along the first direction, the vertical openings on the first vertical plate and the vertical openings on the second vertical plate correspond one by one.

[0027] A plurality of sealing strips are detachably connected to each of the vertical plates and parallel to each other along the second direction, each of the sealing strips corresponds to a vertical opening, and the sealing strips are used for covering and sealing the vertical openings, the fifth end of the graphite sheet is capable of being fixed on the first vertical plate by the sealing strips on the first vertical plate, and the sixth end of the graphite sheet is capable of being fixed on the second vertical plate by the sealing strips on the second vertical plate corresponding to the sealing strips on the first vertical plate.

[0028] In some possible embodiments, the cover plate has a seventh end and an eighth end opposite along the first direction, one of the seventh end and the eighth end of the cover plate is provided with a connecting piece,

[0029] Two ends of the connecting piece opposite along the second direction are respectively connected to a combination piece, and a plurality of through holes are arranged on the combination piece along the first direction and spaced apart;

[0030] Two ends of the sliding piece opposite along the second direction are respectively provided with a limiting column, each of the limiting columns corresponds to a through hole, and the limiting columns are capable of being embedded into the through holes at the same end.

[0031] In some possible implementation manners, when the first surface of the cover plate covers the top opening of the base assembly, each first column in the first column group corresponds to each other in the first direction, forming a plurality of first row groups, each first row group comprising a plurality of first columns distributed in the first direction at intervals; each second column in the second column group corresponds to each other in the first direction, forming a plurality of second row groups, each second row group comprising a plurality of second columns distributed in the first direction at intervals; the same graphite sheet is located between the first row group and the second row group adjacent in the second direction.

[0032] In some possible implementation manners, when the slider moves in the second direction by a predetermined distance, the graphite sheet is arranged in a "V" shape between two adjacent first columns in the first row group in the first direction under pulling of the slider.

[0033] In the second aspect of the utility model, a processing method of graphite heat-conducting sheet is provided, and the forming jig is applied, and the processing method comprises the following steps:

[0034] At least one graphite sheet and heat-conducting paste are prepared;

[0035] The graphite sheet is placed into the base assembly, so that the graphite sheet is fixed in the receiving cavity at two ends in the first direction;

[0036] When the cover plate assembly covers the top opening of the base assembly, each first column in the first column group corresponds to each other in the first direction, forming a plurality of first row groups, each first row group comprising a plurality of first columns distributed in the first direction at intervals; each second column in the second column group corresponds to each other in the first direction, forming a plurality of second row groups, each second row group comprising a plurality of second columns distributed in the first direction at intervals; the same graphite sheet is located between the first row group and the second row group adjacent in the second direction;

[0037] The slider is moved in the second direction by a predetermined distance, so that the graphite sheet between two adjacent first columns in the first row group in the first direction is arranged in a "V" shape;

[0038] The cover plate assembly is removed from the top opening of the base assembly, and the heat-conducting paste is injected into the receiving cavity of the base assembly;

[0039] The base assembly after the heat-conducting paste is injected is placed into an oven for heating and curing, so that at least one graphite heat-conducting sheet is obtained.

[0040] In some possible implementation manners, the temperature of the oven is 140-160 DEG C.

[0041] The utility model discloses the beneficial effect at least includes:

[0042] 1. through the second direction movement of sliding piece predetermined distance, let the graphite sheet be " V " type arrangement between the graphite sheet of two first vertical column of first direction first vertical column group of adjacent in the pulling of second vertical column, namely second vertical column group of sliding piece, realize the stretching of graphite sheet The fixed type, increase the contact surface area of graphite sheet.

[0043] 2. Because graphite sheet and heat conduction slurry contact, there will be small gap between graphite sheet and heat conduction slurry, the air in the gap will hinder the heat transfer, thereby forming air thermal resistance, reducing the heat conductivity of whole graphite heat conduction sheet, through the stretching of graphite sheet of fixed tool, the graphite sheet is " V " type arrangement, increase the contact surface area of graphite sheet, when graphite sheet and heat conduction slurry in the containing cavity contact, the contact surface of graphite sheet and the material surface of heat conduction slurry are fully contacted, through this full contact, reduce the gap between heat conduction slurry and graphite sheet, thereby reducing or even eliminating air thermal resistance, and then improve the heat conductivity of graphite heat conduction sheet as a whole, " V " type arrangement increases the contact surface area of graphite sheet, makes graphite sheet and heat conduction slurry fully contact, helps heat conduction slurry evenly dispersed on graphite sheet, avoids the agglomeration phenomenon, prevents the local overheating, uneven heat dissipation etc. of whole graphite heat conduction sheet, further improves the heat conductivity of graphite heat conduction sheet, and enhances its reliability and service life. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is the three-dimensional structure schematic diagram of fixed tool for the utility model embodiment;

[0045] Figure 2 It is the cross section structure schematic diagram of fixed tool for the utility model embodiment;

[0046] Figure 3 It is the three-dimensional structure schematic diagram of cover plate subassembly for the utility model embodiment;

[0047] Figure 4 It is the three-dimensional structure schematic diagram of base subassembly for the utility model embodiment;

[0048] Figure 5 It is the overhead structure schematic diagram of graphite sheet " V " type arrangement in base subassembly.

[0049] In the drawing, 11, cover plate;12, sliding piece;13, first vertical column;14, second vertical column;15, connecting piece;16, combination piece;17, limit post;21, bottom plate;22, first side plate;23, second side plate;24, first vertical plate;25, second vertical plate;26, sealing strip;10, graphite sheet. DETAILED DESCRIPTION

[0050] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and fully convey the inventive aspects of the example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings, and the repeated description of like elements will be omitted for sake of brevity.

[0051] Referring to the drawings Figures 1-5 The present embodiment provides a shaping jig, which comprises a cover plate assembly and a base assembly.

[0052] The cover plate assembly comprises a cover plate 11, a first column of column groups and a second column of column groups. The cover plate 11 has a first face, and the first face of the cover plate 11 is provided with a plurality of first columns of column groups which are spaced apart and parallel to each other along a first direction (denoted as F1), and a second column of column groups which is parallel to the first column of column groups is arranged between two adjacent first columns of column groups, and the second column of column groups is configured to be able to slide relative to the cover plate 11 along a second direction.

[0053] The first column of column groups comprises a plurality of first columns 13 which are spaced apart along the second direction (denoted as F2) and are embedded and fixed on the first face of the cover plate 11, and the second column of column groups comprises a plurality of second columns 14 which are spaced apart along the second direction.

[0054] It should be noted that the first direction and the second direction are perpendicular, and in the present embodiment, the first direction can be the length direction of the cover plate 11, and the second direction can be the width direction of the cover plate 11.

[0055] In some specific embodiments, referring to the drawings Figure 3 The first face of the cover plate 11 is provided with a plurality of sliding grooves which are spaced apart and parallel to each other along the first direction, and the sliding grooves are located between two adjacent first columns of column groups, each sliding groove is in sliding connection with a sliding piece 12 corresponding thereto, and a second column of column groups is correspondingly arranged on each sliding piece 12, and all the second columns 14 in the second column of column groups are embedded and fixed on the corresponding sliding piece 12. Under the driving of the sliding piece 12, the second columns 14 on the sliding piece 12 slide relative to the cover plate 11 along the second direction.

[0056] Further, the sliding groove and the sliding piece 12 are both "T" shaped, and the sliding piece 12 is embedded in the sliding groove, so that the stability of the sliding piece 12 in the sliding groove can be fully ensured.

[0057] The base assembly has a top opening and a receiving cavity communicating with the top opening. The receiving cavity is used to vertically place at least one graphite sheet 10, with both ends of the graphite sheet 10 fixed within the receiving cavity along a first direction. The length direction of the graphite sheet 10 is the same as the first direction.

[0058] Furthermore, the cavity can also be used to hold thermally conductive slurry.

[0059] When the cover assembly closes to the top opening of the base assembly, the first side of the cover 11 covers the top opening of the base assembly, allowing the first column group and the second column group to enter the receiving cavity.

[0060] When the first side of the cover plate 11 covers the top opening of the base assembly, each first column 13 in all the first column groups corresponds one-to-one in the first direction, forming multiple first row column groups, each first row column group including multiple first columns 13 spaced apart in the first direction; each second column 14 in all the second column groups corresponds one-to-one in the first direction, forming multiple second row column groups, each second row column group including multiple second columns 14 spaced apart in the first direction; the same graphite sheet 10 is located between adjacent first row column groups and second row column groups in the second direction.

[0061] See appendix Figure 5 As shown, since the graphite sheet 10 is flexible, when the slider 12 moves a predetermined distance in the second direction, the graphite sheet 10 is pulled by the second column 14 on the slider 12, that is, the second row of column group, so that the graphite sheets between two adjacent first columns 13 in the first row of column group in the first direction are arranged in a "V" shape, thereby stretching and shaping the graphite sheet 10 and increasing the contact surface area of ​​the graphite sheet 10.

[0062] Furthermore, the lengths of the first column 13 and the second column 14 are greater than or equal to the width of the graphite sheet 10. Both the first column 13 and the second column 14 are set as cylinders, so that the cylinders can fully contact the graphite sheet 10, thereby further increasing the contact surface area of ​​the graphite sheet 10 during the stretching and shaping process.

[0063] For some specific implementation methods, see the appendix. Figure 4 As shown, the base assembly includes a base plate 21, two side plates, and two upright plates. The base plate 21 has a second surface opposite to the first surface of the cover plate 11. The two side plates include a first side plate 22 and a second side plate 23 disposed opposite each other on the second surface of the base plate 21 along a second direction, and the first side plate 22 and the second side plate 23 are parallel to each other. The two upright plates include a first upright plate 24 and a second upright plate 25 disposed opposite each other on the second surface of the base plate along a first direction, and the first upright plate 24 and the second upright plate 25 are parallel to each other.

[0064] Each side plate has a first end and a second end opposite along a first direction, and each upright plate has a third end and a fourth end opposite along a second direction. The first end of the first side plate 22 is connected to the third end of the first upright plate 24, and the second end of the first side plate 22 is connected to the third end of the second upright plate 25. The first end of the second side plate 23 is connected to the fourth end of the first upright plate 24, and the second end of the second side plate 23 is connected to the fourth end of the second upright plate 25.

[0065] The two side plates and the two upright plates form a top opening and, together with the bottom plate 21, enclose a containing cavity in communication with the top opening. Further, the graphite sheet 10 has a fifth end and a sixth end opposite along a length direction thereof, and the fifth end of the graphite sheet 10 is capable of being fixed on the first upright plate 24, and the sixth end of the graphite sheet 10 is capable of being fixed on the second upright plate 25.

[0066] It can be understood that the second surface of the bottom plate 21 can be regarded as a cavity bottom of the containing cavity.

[0067] In some specific embodiments, referring to FIG. 1, the graphite sheet 10 is capable of being inserted into the containing cavity through the top opening. Figure 1 and 4 As shown in FIG. 1, a plurality of vertical openings are arranged on the two upright plates and spaced apart and parallel to each other along the second direction. Along the first direction, the vertical openings on the first upright plate 24 and the vertical openings on the second upright plate 25 correspond to each other one by one.

[0068] A plurality of sealing strips 26 are detachably connected to each upright plate and parallel to each other along the second direction. Each sealing strip 26 corresponds to a vertical opening, and the sealing strip 26 is used for covering and sealing the vertical opening. The sealing strips 26 on the first upright plate 24 are capable of fixing the fifth end of the graphite sheet 10 on the first upright plate 24. The sealing strips 26 on the second upright plate 25 corresponding to the sealing strips 26 on the first upright plate 24 are capable of fixing the sixth end of the graphite sheet 10 on the second upright plate 25.

[0069] The sixth end of the graphite sheet 10 can enter the containing cavity through the vertical opening on the first upright plate 24. As the insertion continues, the sixth end of the graphite sheet 10 enters the vertical opening on the second upright plate 25. At this time, the fifth end of the graphite sheet 10 is located on the vertical opening on the first upright plate 24. Then, the fifth end of the graphite sheet 10 is fixed on the first upright plate 24 by the sealing strips 26, and the sixth end of the graphite sheet 10 is fixed on the second upright plate 25 by the sealing strips 26. At this time, the sealing strips 26 cover and seal the vertical openings, so that the graphite sheet 10 is fixed vertically, and the containing cavity (except the top opening) is sealed. At this time, when there are a plurality of graphite sheets 10 in the containing cavity, the graphite sheets 10 are parallel to each other.

[0070] In some specific embodiments, referring to FIG. 1, the graphite sheet 10 is capable of being inserted into the containing cavity through the top opening. Figure 1 and 3As shown, the cover plate 11 has a seventh end and an eighth end opposite in the first direction, and the seventh end or the eighth end of the cover plate 11 is provided with a connecting piece 15. The connecting piece 15 has two ends opposite in the second direction, and each end is connected with a combining piece 16, and the combining piece 16 is provided with a plurality of through holes spaced apart in the first direction.

[0071] The sliding piece 12 is provided with a limiting post 17 at each end opposite in the second direction, and the limiting post 17 is embedded and fixed on the sliding piece 12. Each limiting post 17 corresponds to a through hole, and the limiting post 17 can be embedded in the through hole at the same end.

[0072] When the sliding piece 12 moves a predetermined distance on the sliding groove in the second direction, in order to fully stretch and shape the graphite sheet 10, the two ends of the sliding piece 12 need to be fixed to prevent the sliding piece 12 from moving too much to affect the shaping effect. The limiting post 17 on the sliding piece 12 is embedded in the through hole on the combining piece 16 to fix the sliding piece 12 and ensure the stretching and shaping effect of the graphite sheet 10.

[0073] The embodiment also provides a processing method of a graphite heat-conducting sheet. The graphite sheet is stretched and shaped by using the above-described shaping jig, and the method includes the following steps S1-S6.

[0074] Step S1: Prepare at least one graphite sheet 10 and heat-conducting paste.

[0075] The formula of the heat-conducting paste does not belong to the content to be protected by the present application, and will not be described here.

[0076] Step S2: Place the graphite sheet 10 in the base assembly so that the two ends of the graphite sheet 10 in the first direction are fixed in the accommodating cavity.

[0077] Step S3: When the cover plate assembly covers the top opening of the base assembly, each first column 13 in the first column group corresponds to each first column 13 in the first direction to form a plurality of first row groups, each first row group includes a plurality of first columns 13 spaced apart in the first direction; each second column 14 in the second column group corresponds to each second column 14 in the first direction to form a plurality of second row groups, each second row group includes a plurality of second columns 14 spaced apart in the first direction; and the same graphite sheet is located between the first row group and the second row group adjacent in the second direction.

[0078] Step S4: After the sliding piece 12 moves a predetermined distance on the sliding groove in the second direction, the two ends of the sliding piece 12 are fixed, and the graphite sheet between the two first columns 13 adjacent in the first row group in the first direction is arranged in a “V” shape.

[0079] Step S5: moving the cover plate assembly away from the top opening of the base assembly, and injecting the heat-conducting slurry into the accommodating cavity of the base assembly.

[0080] Step S6: placing the base assembly after injecting the heat-conducting slurry into the oven for heating and curing to obtain at least one graphite heat-conducting sheet.

[0081] In some specific embodiments, the temperature of the oven is 140-160℃. If the temperature of the oven is too high, the oxidation and consumption of the graphite sheet may be accelerated, resulting in a decrease in performance such as strength, hardness, and a decrease in electrical conductivity and thermal stability. If the temperature of the oven is too low, the molecules in the heat-conducting slurry may not diffuse into the graphite sheet, so that the graphite sheet and the heat-conducting slurry cannot be fully combined.

[0082] The temperature of the oven is preferably 150℃ to ensure that the graphite sheet and the heat-conducting slurry can be fully combined, to ensure the heat-conducting effect of the graphite heat-conducting sheet and to improve the overall stability thereof.

[0083] Because there are small gaps between the graphite sheet and the heat-conducting slurry when the graphite sheet is in contact with the heat-conducting slurry, the air in the gaps will hinder the transfer of heat, thereby forming air thermal resistance and reducing the heat conductivity of the entire graphite heat-conducting sheet. The stretching and shaping of the graphite sheet by the shaping jig causes the graphite sheet to be arranged in a "V" shape, which increases the contact surface area of the graphite sheet. When the graphite sheet is in contact with the heat-conducting slurry in the accommodating cavity, the contact surface of the graphite sheet is fully in contact with the material surface of the heat-conducting slurry. This full contact reduces the gaps between the heat-conducting slurry and the graphite sheet, thereby reducing or even eliminating air thermal resistance, and further improving the overall heat conductivity of the graphite heat-conducting sheet. The "V" arrangement increases the contact surface area of the graphite sheet, which allows the graphite sheet to be fully in contact with the heat-conducting slurry, which helps the heat-conducting slurry to be uniformly dispersed on the graphite sheet and avoids agglomeration, preventing local overheating and uneven heat dissipation of the entire graphite heat-conducting sheet, further improving the heat conductivity of the graphite heat-conducting sheet while enhancing its reliability and service life.

[0084] The processing method of the present application solves the problem in the prior art that the heat-conducting slurry is placed on the graphite sheet and formed into a graphite heat-conducting sheet of a desired shape by pressing, but the graphite sheet will be displaced during the pressing process with the heat-conducting slurry, thereby negatively affecting the heat conductivity of the graphite heat-conducting sheet.

[0085] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application, and all such changes should be within the scope of the claims of the present application.

Claims

1. A molding fixture characterized by, The application relates to a graphite sheet storage device. The graphite sheet storage device comprises: a cover plate assembly, which comprises a cover plate, a first column of stand groups and a second column of stand groups, the cover plate has a first surface, the first surface of the cover plate is provided with a plurality of first columns of stand groups which are spaced apart and parallel to each other in a first direction, a second column of stand groups which is parallel to the first column of stand groups is arranged between two adjacent first columns of stand groups, and the second column of stand groups is configured to slide relative to the cover plate in a second direction; wherein the first direction and the second direction are perpendicular to each other; the first column of stand groups comprises a plurality of first stands which are spaced apart in the second direction, and the second column of stand groups comprises a plurality of second stands which are spaced apart in the second direction; a base assembly which has a top opening and a containing cavity which is in communication with the top opening and is used for vertically placing at least one graphite sheet, and the two ends of the graphite sheet along the first direction are fixed in the containing cavity; 2. The fixture of claim 1, wherein the first surface of the cover plate covers the top opening of the base assembly, so that the first column of stand groups and the second column of stand groups enter the containing cavity.

3. The fixture of claim 1 or 2, wherein the first surface of the cover plate is provided with a plurality of sliding grooves which are spaced apart and parallel to each other in the first direction, the sliding grooves are located between two adjacent first columns of stand groups, each sliding groove is in sliding connection with a sliding piece, and a second column of stand groups is correspondingly arranged on each sliding piece, and all the second stands in the second column of stand groups are embedded and fixed on the corresponding sliding piece. the base assembly comprises: a bottom plate which has a second surface opposite to the first surface of the cover plate; two side plates which comprise a first side plate and a second side plate which are oppositely arranged on the second surface of the bottom plate in the second direction and are parallel to each other; two vertical plates which comprise a first vertical plate and a second vertical plate which are oppositely arranged on the second surface of the bottom plate in the first direction and are parallel to each other; each side plate has a first end and a second end which are opposite to each other in the first direction; each vertical plate has a third end and a fourth end which are opposite to each other in the second direction; the first end of the first side plate is connected with the third end of the first vertical plate, and the second end of the first side plate is connected with the third end of the second vertical plate; the first end of the second side plate is connected with the fourth end of the first vertical plate, and the second end of the second side plate is connected with the fourth end of the second vertical plate; the two side plates and the two vertical plates form the top opening and surround the bottom plate to form the containing cavity which is in communication with the top opening; 4. The fixture of claim 3 wherein, the graphite sheet has a fifth end and a sixth end which are opposite to each other along the length direction of the graphite sheet, the fifth end of the graphite sheet can be fixed on the first vertical plate, and the sixth end of the graphite sheet can be fixed on the second vertical plate. a plurality of vertical openings which are spaced apart and parallel to each other in the second direction are arranged on the two vertical plates, and the vertical openings on the first vertical plate and the vertical openings on the second vertical plate correspond to each other in the first direction. Each vertical plate is detachably connected with a plurality of sealing strips parallel to each other in the second direction, each sealing strip corresponding to a vertical opening, the sealing strips being used to cover and seal the vertical openings, the sealing strips on the first vertical plate being able to fix the fifth end of the graphite sheet on the first vertical plate, the sealing strips on the second vertical plate corresponding to the sealing strips on the first vertical plate being able to fix the sixth end of the graphite sheet on the second vertical plate.

5. The fixture of claim 2 wherein, The cover plate has a seventh end and an eighth end opposite to each other in the first direction, the seventh end or the eighth end of the cover plate being provided with a connecting piece, The connecting piece has two ends opposite to each other in the second direction, and each end is connected with a combination piece, the combination piece being provided with a plurality of through holes distributed at intervals in the first direction; The sliding piece has two ends opposite to each other in the second direction, and each end is provided with a limiting column, each limiting column corresponding to a through hole, and the limiting column being able to be embedded in the through hole at the same end.

6. The fixture of claim 2 wherein, When the first surface of the cover plate covers the top opening of the base assembly, each first vertical column in all first vertical column groups corresponds to each other in the first direction, forming a plurality of first vertical column groups, each first vertical column group including a plurality of first vertical columns distributed at intervals in the first direction; each second vertical column in all second vertical column groups corresponds to each other in the first direction, forming a plurality of second vertical column groups, each second vertical column group including a plurality of second vertical columns distributed at intervals in the first direction; the same graphite sheet is located between the first vertical column group and the second vertical column group adjacent in the second direction.

7. The fixture of claim 6 wherein, When the sliding piece moves a predetermined distance in the second direction, the graphite sheet is arranged in a "V" shape between two adjacent first vertical columns in the first vertical column group in the first direction under the pulling of the sliding piece.

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