A graphene film heat conduction performance detection device

Abstract

The present application relates to the technical field of graphene performance detection, and particularly relates to a graphene film heat conduction performance detection device, which comprises a supporting mechanism and a detection mechanism for supporting and limiting the film, the supporting mechanism comprises a supporting frame, and a hole round plate is installed on the upper end of the supporting frame; the detection mechanism is connected to the supporting frame, and the detection mechanism comprises a base ring placed on the upper end of the hole round plate, an adjusting part is connected to the upper end of the base ring through a rubber ring, a sealing cover is connected to the adjusting part, a detection part is connected to the sealing cover, and two distance adjusting parts are connected between the sealing cover and the base ring. The adjusting part and the detection part are matched, the graphene film can be adjusted in multiple detection modes in the same detection device, the diversity of the graphene detection of the detection device is increased, the graphene film detection samples are increased, the accuracy of the graphene film detection result is further improved, and the applicability of the detection device is improved.

Description

Technical Field

[0001] This invention relates to the field of graphene performance testing technology, and in particular to a device for testing the thermal conductivity of graphene films. Background Technology

[0002] Graphene film is a two-dimensional material composed of a single layer of carbon atoms with a honeycomb lattice structure. It has advantages such as high strength, high electrical conductivity, and excellent thermal conductivity, and is widely used in electronic devices, energy storage, composite materials, biomedicine and other fields.

[0003] Testing the thermal conductivity of graphene films is of great significance, mainly in the following aspects: evaluating material properties, guiding preparation processes, ensuring product quality, and promoting technological development.

[0004] When testing the thermal conductivity of graphene films, localized heating can be used, and the thermal conductivity can be calculated by measuring the temperature at different locations. This method falls under the category of unsteady-state thermal conductivity testing techniques. Its core principle is based on the heat conduction equation, deriving the material's thermal conductivity by analyzing the changes in temperature over time and space. The heat conduction equation is: Where q is the heat flux density and k is the thermal conductivity. The temperature gradient is used. Specifically, by placing a localized heating source on the thin film and arranging temperature sensors at different distances from the heating area, the temperature change over time can be monitored in real time. The thermal conductivity k can then be derived using a thermal conduction model.

[0005] Currently, when testing the thermal conductivity of graphene films, the fixed detection position of the temperature sensor means that only one temperature measurement result can be obtained in a single test, resulting in a small number of temperature samples. Furthermore, the detection position cannot be directly adjusted after the test to obtain multiple sets of temperature samples. If multiple sets of temperature sample data are required, multiple sets of temperature sensors must be set up, which not only increases the cost of thermal conductivity testing but also limits the temperature measurement to the initial position, resulting in only temperature gradients at specific intervals and reducing the applicability of the testing device.

[0006] Therefore, there is an urgent need to provide a thermal conductivity testing device that can increase detection efficiency and improve operational flexibility when changing the detection location. Summary of the Invention

[0007] Therefore, it is necessary to provide a device for testing the thermal conductivity of graphene films, which aims to solve the problems arising from the existing technology in testing the thermal conductivity of graphene films.

[0008] To achieve the above objectives, the present invention employs the following technical solution: a graphene film thermal conductivity testing device, comprising: a support mechanism for supporting and limiting the film, the support mechanism including a support frame, and a perforated circular plate installed at the upper end of the support frame.

[0009] The graphene film thermal conductivity testing device also includes a testing mechanism connected to the support frame. The testing mechanism includes a base ring detachably connected to a perforated circular plate. An adjustment part is connected to the upper end of the base ring, a sealing cover is connected to the adjustment part, and the testing part is connected to the sealing cover.

[0010] The adjustment part includes two rotating rings that are rotatably connected to the upper end of the base ring and the lower end of the sealing cover and are distributed vertically. The two rotating rings are rotatably connected. A positioning ring plate with multiple circumferentially evenly opened positioning holes is sleeved on the outer ring surface of the base ring. The positioning ring plate is located below the lower rotating ring. A moving rod with multiple linearly opened locking holes is inserted into the rotating ring. A locking rod is simultaneously inserted into any two locking holes, one above the other.

[0011] The detection unit includes a positioning post that runs through the top wall of the sealing cover. A heating module is installed at the lower end of the positioning post via a spring telescopic rod. Two first telescopic rods are rotatably connected to the positioning post and are hinged to each other. A second telescopic rod is installed on the opposite side of the moving section of each of the two first telescopic rods and is fixedly connected to the corresponding moving rod. A connecting block is installed at the end of the moving section of the first telescopic rod. A temperature measuring module is installed at the lower end of the connecting block and the lower end of the fixed section of the first telescopic rod.

[0012] Preferably, the supporting mechanism further includes multiple circumferentially evenly distributed limiting parts connected to the upper end of the perforated circular plate, and multiple circumferentially evenly distributed pressing parts for pressing the base ring are connected to the side wall of the perforated circular plate.

[0013] Preferably, the detection mechanism further includes a limiting part for defining the position of the sealing cap and the base ring.

[0014] Preferably, the limiting part includes a limiting frame that is mounted on the upper end of the perforated circular plate and is in the shape of an inverted L. A telescopic limiting rod is installed at the lower end of the horizontal section of the limiting frame, and a pressure plate is installed at the lower end of the telescopic limiting rod.

[0015] Preferably, the clamping part includes a first ear seat installed on the side wall of the perforated circular plate, a rotating rod rotatably connected to the upper end of the first ear seat, and a clamping block installed on the upper end of the rotating rod.

[0016] Preferably, the limiting part includes second ear seats symmetrically installed at both ends of the annular sidewall of the sealing cover, a support rod is installed at the lower end of the second ear seat, a third ear seat is installed at the lower end of the support rod, and the third ear seat is fixedly connected to the base ring.

[0017] Preferably, the upper end of the rotating ring is integrally formed with an annular protrusion with a rectangular cross-section, and the lower end of the rotating ring is provided with an annular groove.

[0018] Preferably, the base ring has an L-shaped cross-section and a sealing gasket is laid at the lower end of the horizontal section of the base ring. The upper end of the base ring has an integrally formed annular protrusion with a rectangular cross-section that is rotatably connected to the annular groove located on the lower side.

[0019] Preferably, the lower end of the sealing cover has an annular groove that is rotatably connected to the annular protrusion located on the upper side.

[0020] Preferably, an air extraction pipe is installed through the wall of the supporting frame.

[0021] In summary, the present invention has the following beneficial technical effects: 1. The adjustment unit and the detection unit of the present invention work together to perform multiple detection modes on graphene films under the same detection device, such as different detection spacings in the same area, different detection areas with the same detection spacing, and different detection areas with different detection spacings. This increases the diversity of temperature gradient detection by the detection device and further improves the accuracy of graphene film detection results.

[0022] 2. When the adjustment unit of the present invention adjusts the detection unit, it changes the detection position of the temperature measuring module in the radial and circumferential directions. Temperature measurement can be performed at any position without the need for more temperature measuring modules, which improves the applicability of the detection device and reduces the detection cost of thermal conductivity.

[0023] 3. The detection unit used in this invention can obtain two sets of data each time it is tested, which increases the number of graphene film samples and effectively improves the efficiency of the detection device in obtaining the required samples when detecting graphene. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown.

[0026] Figure 2 A front view of the present invention is shown.

[0027] Figure 3 A left view of the invention is shown.

[0028] Figure 4 It shows Figure 3Sectional view of AA.

[0029] Figure 5 It shows Figure 4 A magnified view of region B in the middle.

[0030] Figure 6 A schematic diagram of the support mechanism of the present invention is shown.

[0031] Figure 7 A schematic diagram of the detection mechanism for removing the sealing cap and the adjusting part according to the present invention is shown.

[0032] Figure 8 It shows Figure 7 A magnified view of region C in the middle.

[0033] The above-mentioned figures include the following reference numerals: 1. Supporting mechanism; 10. Supporting frame; 11. Perforated circular plate; 12. Limiting part; 120. Limiting frame; 121. Pressure plate; 13. Pressing part; 130. First ear seat; 131. Rotating rod; 132. Pressing block; 14. Air extraction pipe; 2. Detection mechanism; 20. Base ring; 21. Adjusting part; 210. Rotating ring; 211. Positioning ring plate; 212. Positioning hole; 213. Moving rod; 214. Locking hole. ; 215. Locking rod; 216. Annular protrusion one; 217. Annular groove one; 218. Annular protrusion two; 219. Annular groove two; 22. Sealing cover; 23. Detection unit; 230. Positioning post; 231. Spring telescopic rod; 232. Heating module; 233. First telescopic rod; 234. Second telescopic rod; 235. Connecting block; 236. Temperature measuring module; 24. Limiting part; 240. Second ear seat; 241. Support rod; 242. Third ear seat. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] See Figures 1-4 A graphene film thermal conductivity testing device includes a support mechanism 1 for supporting and limiting the film. The support mechanism 1 includes a support frame 10, and a perforated circular plate 11 is installed on the upper end of the support frame 10.

[0036] In actual operation, the support frame 10 is fixed in the working position, and then the graphene film to be tested is placed on the perforated circular plate 11. The through holes on the perforated circular plate 11 are used for gas flow.

[0037] See Figures 4-6 The supporting mechanism 1 also includes multiple circumferentially evenly distributed limiting parts 12 connected to the upper end of the perforated circular plate 11. The limiting part 12 includes a limiting frame 120 installed on the upper end of the perforated circular plate 11 and in the shape of an inverted L. A telescopic limiting rod 121 is installed at the lower end of the horizontal section of the limiting frame 120, and a pressure plate 121 is installed at the lower end of the telescopic limiting rod 121.

[0038] In actual operation, the telescopic limit rod 121 is a telescopic rod with elasticity. When the film is placed, the pressure plate 122 is pulled upward. After the film is placed on the perforated circular plate 11 below the pressure plate 122, the grip on the pressure plate 122 is released, and the telescopic limit rod 121 drives the pressure plate 122 to reset and press and limit the film.

[0039] See Figure 1 and Figure 4 The graphene film thermal conductivity testing device also includes a testing mechanism 2, which is connected to the support frame 10. The testing mechanism 2 includes a base ring 20 placed on the upper end of the perforated circular plate 11. An adjustment part 21 is connected to the upper end of the base ring 20. A sealing cover 22 is connected to the adjustment part 21. A testing part 23 is connected to the sealing cover 22.

[0040] In actual operation, after the film is positioned, the sealing cover 22 is moved above the perforated circular plate 11 and then moved downwards. The sealing cover 22 drives the base ring 20 to move downwards through the adjustment part 21 until the lower end of the base ring 20 is in close contact with the upper end of the perforated circular plate 11.

[0041] See Figure 1 , Figure 4 and Figure 6 The perforated circular plate 11 has multiple circumferentially evenly distributed pressing parts 13 connected to its side wall for pressing the base ring 20. Each pressing part 13 includes a first ear seat 130 installed on the side wall of the perforated circular plate 11. A rotating rod 131 is rotatably connected to the upper end of the first ear seat 130, and a pressing block 132 is installed on the upper end of the rotating rod 131.

[0042] In actual operation, after the lower end of the base ring 20 is tightly attached to the perforated circular plate 11, multiple pressing blocks 132 are rotated in sequence. The pressing blocks 132 rotate to the upper end of the horizontal section of the base ring 20 and press and limit the base ring 20. At the same time, a sealing gasket is set at the lower end of the base ring 20 to increase the sealing between the base ring 20 and the perforated circular plate 11.

[0043] See Figure 1 and Figure 4 An air extraction pipe 14 is installed through the frame wall of the support frame 10.

[0044] In actual operation, the existing air pump is connected to the suction pipe 14. After the base ring 20 is connected and limited to the perforated circular plate 11, the air pump is started. The air pump extracts the air in the support frame 10 through the suction pipe 14. At the same time, the air in the sealing cover 22 flows into the support frame 10 through the through hole on the perforated circular plate 11 and is discharged from the suction pipe 14, so that the membrane is in a vacuum environment.

[0045] See Figure 1 , Figure 4 , Figure 7 and Figure 8 The adjusting part 21 includes two rotating rings 210 that are rotatably connected to the upper end of the base ring 20 and the lower end of the sealing cover 22 and are distributed vertically. The two rotating rings 210 are also rotatably connected to each other. A positioning ring plate 211 with multiple circumferentially evenly opened positioning holes 212 is fitted on the outer ring surface of the base ring 20. The positioning ring plate 211 is located below the lower rotating ring 210. A moving rod 213 with multiple linearly opened locking holes 214 is inserted into the rotating ring 210. A locking rod 215 is inserted into any two locking holes 214 at the top and bottom. The upper end of the rotating ring 210 is integrally formed with an annular protrusion 216 with a rectangular cross section. The lower end of the rotating ring 210 is provided with an annular rotating groove 217.

[0046] See Figure 4 , Figure 7 and Figure 8 The base ring 20 has an L-shaped cross-section and a sealing gasket is laid at the lower end of the horizontal section of the base ring 20. The upper end of the base ring 20 has an annular protrusion 218 with a rectangular cross-section that is rotatably connected to the annular groove 217 located on the lower side.

[0047] See Figure 4 , Figure 7 and Figure 8 The lower end of the sealing cover 22 is provided with an annular groove 219 that is rotatably connected to the annular protrusion 216 located on the upper side.

[0048] See Figure 1 , Figure 4 , Figure 7 and Figure 8 The detection unit 23 includes a positioning post 230 that penetrates the top wall of the sealing cover 22. A heating module 232 is installed at the lower end of the positioning post 230 via a spring telescopic rod 231. Two first telescopic rods 233 are rotatably connected to the positioning post 230 and are hinged to each other. A second telescopic rod 234 that is fixedly connected to the corresponding moving rod 213 is fixedly installed on the opposite side of the moving section of the two first telescopic rods 233. A connecting block 235 is installed at the end of the moving section of the first telescopic rod 233. A temperature measuring module 236 is installed at the lower end of the connecting block 235 and the lower end of the fixed section of the first telescopic rod 233.

[0049] It should be noted that the moving rod 213 is sealed with the rotating ring 210 and the moving rod 213 can move radially. The contact surfaces of the positioning post 230 and the first telescopic rod 233 are provided with damping rings to increase frictional resistance. The damping rings can prevent the second telescopic rod 234 from being pushed by force to rotate the first telescopic rod 233 when the moving rod 213 moves radially. The purpose is to make the moving rod 213 move radially, and the temperature measuring module 236 can only move along the initial extension direction of the first telescopic rod 233. The first telescopic rod 233 will only rotate around the positioning post 230 when the moving rod 213 rotates circumferentially.

[0050] In actual operation, while the sealing cover 22 drives the base ring 20 to cover the perforated circular plate 11 through the adjustment part 21, the sealing cover 22 drives the spring telescopic rod 231 and the heating module 232 to move downward through the positioning post 230 until the lower end of the heating module 232 is in close contact with the film. The heating module 232 is an existing microelectromechanical system heating element or resistance heating element.

[0051] Based on the required temperature measurement point spacing, two movable rods 213 are moved radially on two rotating rings 210 to avoid affecting the vacuum environment when adjusting the temperature measurement point position. The radial movement of the two movable rods 213 drives the movement of two second telescopic rods 234, which in turn drive the movement of the moving sections of the two first telescopic rods 233. The moving sections of the first telescopic rods 233 drive the movement of the corresponding temperature measurement modules 236 through the connecting block 235, thereby changing the spacing between the two temperature measurement modules 236 on the same first telescopic rod 233. The temperature measurement modules 236 are existing non-contact temperature sensors, such as infrared thermal imagers. At the same time, the moving sections of the second telescopic rods 234 move along with the first telescopic rods. The moving segment 233 moves adaptively, and the two moving rods 213 can move independently. That is, the distance that the two moving rods 213 move can be adjusted to adjust the distance between the temperature measuring modules 236 corresponding to the two first telescopic rods 233. This enables the function of obtaining the temperature difference between two sets of temperature measuring points with the same distance or the temperature difference between two sets of temperature measuring points with different distances during a single temperature detection process, effectively improving the efficiency of temperature detection. At this time, the two moving rods 213 are in the same vertical position. Then, the locking rod 215 is inserted into the corresponding two locking holes 214, and then the locking rod 215 is inserted into the corresponding positioning hole 212 on the positioning ring plate 211 to realize the function of limiting the moving rod 213 after movement.

[0052] Alternatively, after the two moving rods 213 in the same vertical position have moved, i.e., after the distance between the two sets of temperature points has been determined, the two moving rods 213 can be pushed circumferentially. The two moving rods 213 drive the two rotating rings 223 to rotate between the connecting ring 220 and the sealing cover 22 via the two guide frames 227. During rotation, the two moving rods 213 rotate simultaneously in the same direction or in opposite directions, thereby driving the two connecting blocks 235 and the two temperature measuring modules 236 to move to different areas of the membrane via the two second telescopic rods 234 and the two first telescopic rods 233. When rotating in the same direction, the locking rod 215 is inserted into the corresponding two locking holes 214, and then the locking rod 215 is inserted into the corresponding positioning hole 212 on the positioning ring plate 211. When rotating in the opposite direction, two locking rods 215 are selected, and the two locking rods 215 are inserted into the corresponding two locking holes 214, and then the two locking rods 215 are inserted into the corresponding two positioning holes 212 on the positioning ring plate 211, thereby limiting the movement rod 213 after rotation, thus realizing the function of detecting different areas under the condition of the distance between two sets of temperature measuring points.

[0053] Mechanical seals (not shown in the figure) are provided at the rotatable connection between the annular protrusion 216 and the annular groove 217 between the two rotating rings 210, at the rotatable connection between the annular protrusion 216 on the upper rotating ring 210 and the annular groove 219 at the lower end of the sealing cover 22, and at the rotatable connection between the annular groove 217 on the lower rotating ring 210 and the annular protrusion 218 at the upper end of the base ring 20, to prevent the vacuum environment from being affected when the two rotating rings 210 rotate.

[0054] When the adjustment unit 21 adjusts the detection unit 24, it is not necessary to separate the sealing cover 22 from the perforated circular plate 11, which reduces the operation steps of detection adjustment, improves the convenience of detection adjustment operation, and does not require changing the detection environment, reducing the time required to reach the detection environment when re-detecting, thus improving the detection efficiency.

[0055] See Figure 1 The detection mechanism 2 further includes a limiting part 24 for defining the position of the sealing cover 22 and the base ring 20. The limiting part 24 includes a second ear seat 240 symmetrically installed at both ends of the annular sidewall of the sealing cover 22. A support rod 241 is fixedly installed at the lower end of the second ear seat 240. A third ear seat 242 is fixedly installed at the lower end of the support rod 241. The third ear seat 242 is fixedly connected to the base ring 20.

[0056] In actual operation, the support rod 241 connects the base ring 20 and the sealing cover 22 simultaneously through the second ear seat 240 and the third ear seat 242, so as to prevent the base ring 20 and the sealing cover 22 from rotating simultaneously when the two rotating rings 210 rotate, and ensure that the temperature detection position can be flexibly changed.

[0057] The heating module 232 is activated to heat the film. The temperature measured by the temperature measuring module 236 is observed. The temperature difference between the two sets of measuring points is calculated using a formula. Then, the measuring distance between the two sets of measuring points is changed or the position of the two sets of measuring points on the film is changed. The temperature difference between the two sets of measuring points is calculated using a formula. Multiple sets of data are then compared to obtain the final result, and the detection ends.

[0058] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the thermal conductivity of graphene thin films, characterized in that, include: A support mechanism for limiting the film, the support mechanism includes a support frame, and a perforated circular plate is installed on the upper end of the support frame; The testing mechanism is connected to the support frame. The testing mechanism includes a base ring that is detachably connected to a perforated circular plate. An adjustment part is connected to the upper end of the base ring. A sealing cover is connected to the adjustment part. A testing part is connected to the sealing cover. The adjustment unit includes two rotating rings that are rotatably connected to the upper end of the base ring and the lower end of the sealing cover and are distributed vertically. The two rotating rings are rotatably connected. A positioning ring plate with multiple positioning holes evenly opened in the circumference is fitted on the outer ring surface of the base ring. The positioning ring plate is located below the rotating ring on the lower side. A moving rod with multiple locking holes linearly opened is inserted into the rotating ring. A locking rod is inserted into any two locking holes at the top and bottom at the same time. The detection unit includes a positioning post that runs through the top wall of the sealing cover. A heating module is installed at the lower end of the positioning post via a spring telescopic rod. Two first telescopic rods are rotatably connected to the positioning post and are hinged to each other. Damping rings that increase frictional resistance are provided on the contact surfaces of the positioning post and the first telescopic rods. Second telescopic rods that are fixedly connected to the corresponding moving rods are installed on opposite sides of the moving sections of the two first telescopic rods. The damping rings can prevent the second telescopic rods from being forced to rotate the first telescopic rods when the moving rods move radially. A connecting block is installed at the end of the moving section of the first telescopic rod. Temperature measuring modules are installed at the lower end of the connecting block and the lower end of the fixed section of the first telescopic rod.

2. The graphene thin film thermal conductivity testing device according to claim 1, characterized in that: The supporting mechanism also includes multiple circumferentially evenly distributed limiting parts connected to the upper end of the perforated circular plate, and multiple circumferentially evenly distributed pressing parts for pressing the base ring are connected to the side wall of the perforated circular plate.

3. The graphene thin film thermal conductivity testing device according to claim 1, characterized in that: The detection mechanism also includes a limiting part for defining the position of the sealing cap and the base ring.

4. The graphene thin film thermal conductivity testing device according to claim 2, characterized in that: The limiting part includes a limiting frame that is mounted on the upper end of a perforated circular plate and is in the shape of an inverted L. A telescopic limiting rod is installed at the lower end of the horizontal section of the limiting frame, and a pressure plate is installed at the lower end of the telescopic limiting rod.

5. The graphene thin film thermal conductivity testing device according to claim 2, characterized in that: The clamping part includes a first ear seat installed on the side wall of a perforated circular plate, a rotating rod rotatably connected to the upper end of the first ear seat, and a clamping block installed on the upper end of the rotating rod.

6. The graphene thin film thermal conductivity testing device according to claim 3, characterized in that: The limiting part includes second ear seats symmetrically installed at both ends of the annular sidewall of the sealing cover. A support rod is installed at the lower end of the second ear seat, and a third ear seat is installed at the lower end of the support rod. The third ear seat is fixedly connected to the base ring.

7. The graphene film thermal conductivity testing device according to claim 1, characterized in that: The upper end of the rotating ring is integrally formed with an annular protrusion with a rectangular cross-section, and the lower end of the rotating ring is provided with an annular groove.

8. The graphene thin film thermal conductivity testing device according to claim 7, characterized in that: The base ring has an L-shaped cross-section and a sealing gasket at the lower end of the horizontal section. The upper end of the base ring has an integrally formed annular protrusion with a rectangular cross-section that is rotatably connected to the annular groove located on the lower side.

9. The graphene thin film thermal conductivity testing device according to claim 7, characterized in that: The lower end of the sealing cover has an annular groove 2 that is rotatably connected to the annular protrusion 1 located on the upper side.

10. The graphene thin film thermal conductivity testing device according to claim 1, characterized in that: An air extraction pipe is installed through the wall of the supporting frame.

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