A graphene extraction device and method for preparing a heat dissipation film raw material

Abstract

The application relates to the technical field of graphene preparation, and discloses a graphene extraction device and method for preparing raw materials of heat dissipation films, wherein the graphene extraction device for preparing the raw materials of the heat dissipation films comprises a base, a fixed cylinder, a rotating cylinder rotatably arranged in the fixed cylinder, a rotating roller mounted on a fixed shaft and tangent to the inner wall of the rotating cylinder, and a cooling groove fixed in the fixed cylinder; the end of the rotating cylinder is provided with a blade; the cooling groove is provided with a graphite sealing strip, a displacement sensor, a sliding frame, a bimetallic strip, a sliding plate, an electromagnetic seat, an iron block and a second spring, and the sliding plate is provided with adjusting holes. The bimetallic strip is used for adaptively adjusting the cooling flow, the blade is used for assisting air cooling, the peeling temperature is effectively controlled, and the adhesive medium is prevented from being carbonized; the displacement sensor is used for realizing online monitoring and automatic shutdown of the wear of the sealing element, the operation reliability of the equipment is ensured, and the purity and the extraction efficiency of the graphene product are improved.

Description

Technical Field

[0001] This invention relates to the field of graphene preparation technology, specifically to a graphene extraction device and method for preparing heat dissipation film raw materials. Background Technology

[0002] A heat dissipation film is a thin, thermally conductive film applied inside electronic devices such as mobile phones and tablets. It rapidly conducts and evenly distributes heat generated by chips and other heat-generating components, preventing localized overheating that could affect device performance and lifespan. Currently, heat dissipation films are mainly classified into four types: natural graphite heat dissipation films, artificial graphite heat dissipation films, graphene heat dissipation films, and carbon nanotube heat dissipation films. Among these, graphene, as an advanced inorganic non-metallic material, possesses both ultra-high thermal conductivity and excellent flexibility, thus finding increasingly widespread application in the field of heat dissipation films.

[0003] The extraction process of graphene includes multiple steps such as exfoliation, separation, and post-processing. Among them, exfoliation refers to the mechanical force used to crush graphite powder, which is composed of multiple layers of graphene, into a single layer of graphene. This is a key step in the extraction process, and the exfoliation effect directly determines the quality of the final product.

[0004] Patent publication number CN111204746A discloses a graphene exfoliation device, comprising a first cylinder and at least one rotating roller installed inside it. The surface of the rotating roller is tangent to the inner surface of the first cylinder. During operation, the first cylinder and the rotating roller can rotate in opposite directions under the drive of their respective drive mechanisms. This device applies shear force to the graphite raw material through the relative rotation of the cylinder and the rotating roller, causing graphite powder composed of multiple layers of graphene to be crushed into single-layer graphene, thereby achieving the exfoliation of graphene.

[0005] In the actual operation of the existing graphene exfoliation device, the graphite slurry continuously generates friction between the rotating roller and the inner wall of the cylinder, accumulating a large amount of frictional heat. This can easily lead to an abnormal increase in temperature at the friction contact points. However, the polymeric adhesive medium added to assist in exfoliation is prone to carbonization or thermal decomposition at high temperatures. This not only contaminates the graphene product and affects product quality, but also causes the adhesive medium to fail and the exfoliation efficiency to drop significantly. In addition, the high-temperature environment exacerbates the wear and aging of the sealing components, further affecting the continuous and stable operation of the device. Summary of the Invention

[0006] The purpose of this invention is to provide a graphene extraction apparatus and method for preparing heat dissipation film raw materials, so as to solve the problems mentioned in the above process.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a graphene extraction apparatus and method for preparing heat dissipation film raw materials. A graphene extraction apparatus for preparing raw materials for heat dissipation films, comprising: Base; A fixed cylinder is fixed on a base and is provided with a first connecting pipe and a second connecting pipe. A fixed shaft is provided inside the cylinder along the axial direction. A rotating cylinder is rotatably mounted inside a fixed cylinder, with multiple blades on the outside of one end. The rotating roller is mounted on a fixed shaft via a support frame and is tangent to the inner wall of the rotating cylinder. The cooling tank is fixed inside the fixed cylinder and has a first flow channel and a second flow channel connected by a connecting hole. The cooling tank is provided with a graphite sealing strip that abuts against the outer wall of the rotating cylinder via a first spring, and a displacement sensor for monitoring the displacement of the graphite sealing strip; A slide frame is slidably connected inside the cooling tank, and a bimetallic strip that fits into the cooling tank is fixed on the slide frame. A slide plate is slidably provided at the connecting hole, and an adjustment hole is opened on the slide plate. The cooling tank and the slide are respectively equipped with an electromagnetic base and an iron block that cooperate with each other, and a second spring is provided between the cooling tank and the slide; When the electromagnetic base is energized, the slide is in the first position, and the bending of the bimetallic strip can drive the slide plate to change the overlap range between the adjustment hole and the connecting hole. When the electromagnetic base is de-energized, the second spring drives the slide to move to the second position. In this position, the movement of the slide plate cannot connect the adjustment hole and the connecting hole.

[0008] As a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, the fixed shaft is provided with a feed pipe and a discharge pipe, and the feed pipe and the discharge pipe extend into the interior of the rotating cylinder through the middle of the fixed rod.

[0009] In a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, the rotating cylinder and the rotating roller rotate in opposite directions, and the rotating roller is made of an elastic material.

[0010] In a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, the displacement sensor is electrically connected to the electromagnetic base and the motor driving the rotating cylinder. When the displacement sensor detects that the displacement of the graphite sealing strip reaches a set threshold, it controls the electromagnetic base to be de-energized and stops the rotation of the rotating cylinder.

[0011] In a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, the airflow direction generated when the blades rotate is parallel to the axial direction of the rotating cylinder.

[0012] In a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, multiple rotating rollers and cooling tanks are provided and evenly distributed along the circumference of the fixed cylinder, and the cooling tanks are respectively arranged on the outer side of the corresponding rotating rollers.

[0013] As a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, wherein: the end of the fixed cylinder is provided with a detachable end cap, and the end cap is provided with an inlet pipe and an outlet pipe communicating with the first flow channel and the second flow channel.

[0014] As a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, a scissor assembly is provided between the slide plate and the carriage, the scissor assembly includes at least one scissor unit, and the scissor unit consists of two scissor rods rotatably connected in the middle.

[0015] As a preferred embodiment of the graphene extraction device for preparing heat dissipation film raw materials according to the present invention, wherein: a slider is vertically slidably connected to one end of the slide plate, a pressure plate is vertically slidably connected to the slide frame, a third spring is connected between the bottom of the pressure plate and the slide frame, and the pressure plate is located below the bent end of the bimetallic sheet; The scissor lift assembly has four ends, with the two ends at the bottom being rotatably connected to the slide plate and the carriage, respectively, and the two ends at the top being rotatably connected to the slider and the pressure plate, respectively.

[0016] A method for extracting graphene for preparing heat dissipation film raw materials includes the following steps: Step 1: Mix graphite powder and viscous medium to form graphite slurry, and then pass the mixed graphite slurry into the rotating cylinder. Start the rotating cylinder and rotating roller to make them rotate relative to each other. The graphite slurry is subjected to compression and shearing between the inner wall of the rotating cylinder and the rotating roller, which crushes the graphite powder composed of multiple layers of graphene into single layers of graphene, thus realizing the exfoliation process of graphene. Step 2: The electromagnetic base is powered on, the slide is in the first position, and the first and second flow channels in the cooling tank are filled with coolant. Initially, the connecting hole is blocked by the sliding plate. When the heat generated by peeling causes the temperature to rise, the bimetallic strip is heated and bent, driving the sliding plate to move, so that the overlap range between the adjusting hole and the connecting hole gradually increases, automatically increasing the coolant flow rate. Meanwhile, as the rotating cylinder drives the blades to rotate, it pushes the air axially, allowing the external air to enter the fixed cylinder through the first connecting pipe. During the axial pushing process, the rotating cylinder and the graphite sealing strip are cooled. The air is finally discharged from the second connecting pipe. Step 3: Keep the rotating cylinder rotating, de-energize the electromagnetic base, and the second spring drives the slide to move to the second position, so that the adjusting hole and the connecting hole cannot be connected, stopping the flow of coolant. Then switch the first connecting pipe and the second connecting pipe to the heating medium to heat the rotating cylinder, reduce the viscosity of the internal solution, and facilitate its discharge. At the same time, the rotating cylinder drives the blades to rotate and stir the heating medium, avoiding temperature stratification in the fixed cylinder and ensuring uniform heating. After the material flowability is restored, the graphene slurry is discharged through the discharge pipe. Step 4: Perform post-processing operations such as separation, washing, and drying on the discharged graphene slurry to complete the graphene extraction process.

[0017] Compared with the prior art, the beneficial effects of the present invention are: When the heat generated during peeling raises the temperature of the friction contact area, the bimetallic strip bends due to the heat, driving the sliding plate to move. This causes the overlap range between the adjusting hole and the connecting hole to gradually increase with the rising temperature, automatically increasing the coolant flow rate. This achieves real-time adjustment of the cooling flow rate to the peeling temperature, effectively controlling the temperature of the friction contact area and preventing the high-molecular viscous medium in contact with it from carbonizing or thermally decomposing due to high temperature, thus ensuring the purity of the graphene product and the peeling efficiency. Simultaneously, when the electromagnetic base is de-energized, the second spring drives the slide to move to the second position. At this time, the bimetallic strip bends due to the heat, driving the sliding plate to move, preventing the adjusting hole from connecting with the connecting hole. The coolant flow automatically stops, achieving active cutoff of the cooling system during the heating and discharging stage, reducing heat loss and improving the overall extraction efficiency.

[0018] During the process of the rotating cylinder peeling off graphene and cooling the friction contact parts through the cooling tank, the rotation of the rotating cylinder drives multiple blades at the end to rotate, drawing in external air through the first connecting pipe and moving it axially along the outer wall of the rotating cylinder, and finally expelling it from the second connecting pipe. In this process, the flowing air simultaneously provides auxiliary cooling to the friction parts between the outer wall of the rotating cylinder and the graphite sealing strip, as well as the friction parts between the rotating roller and the inner wall of the rotating cylinder. The combined effect of air cooling and liquid cooling not only cools the friction parts between the rotating roller and the inner wall of the rotating cylinder, but also helps to cool the friction parts between the rotating cylinder and the graphite sealing strip, slowing down the wear and aging rate of the graphite sealing strip. At the same time, the first spring continuously pushes the graphite sealing strip to keep it in contact with the outer wall of the rotating cylinder, ensuring the sealing effect and extending the continuous operation time of the equipment.

[0019] After graphene is extracted from graphite powder, when the graphene slurry needs to be discharged, the rotating cylinder is kept rotating, the electromagnetic base is de-energized, and the second spring drives the slide to move to the second position, so that the adjusting hole and the connecting hole cannot be connected, the coolant stops flowing, and the first and second connecting pipes are switched to heating medium to heat the rotating cylinder, thereby reducing the viscosity of the internal solution and facilitating the discharge of the material. At the same time, the rotating cylinder drives the blades to rotate and stir the heating medium, avoiding temperature stratification in the fixed cylinder and ensuring uniform heating. After the material flowability is restored, the graphene slurry is discharged through the discharge pipe, thereby reducing material waste and improving production efficiency.

[0020] The rotating cylinder drives multiple blades to rotate around the axis of rotation. On the one hand, during the process of peeling graphene, the rotation of the blades introduces external cooling air to simultaneously cool the friction parts between the outer wall of the rotating cylinder and the graphite sealing strip, as well as the friction parts between the rotating roller and the inner wall of the cylinder. On the other hand, during the heating and discharging process, the rotating blades agitate the heating medium, keeping the temperature of the heating medium inside the fixed cylinder consistent, avoiding the phenomenon of hot and cold stratification, ensuring uniform heating, and improving the discharging efficiency.

[0021] A displacement sensor is installed on the cooling tank to monitor the displacement of the graphite sealing strip in real time. When the graphite sealing strip wears to a certain extent, the first spring pushes it to move. When the displacement sensor detects that the displacement has reached the set threshold, it sends a signal to control the electromagnetic base to cut off the power and stop the rotation of the rotating cylinder. This realizes online monitoring of seal wear and automatic shutdown protection, prompting operators to replace the graphite sealing strip in time to avoid coolant leakage due to seal failure, prevent abnormal high temperature caused by insufficient cooling during the peeling process, ensure the purity of graphene products in the rotating cylinder, and ensure reliable equipment operation.

[0022] This invention incorporates multiple rotating rollers and cooling tanks, evenly distributed along the circumference of a fixed cylinder. Each cooling tank is positioned correspondingly to the outer side of the rotating roller. The rotating cylinder and multiple rotating rollers rotate simultaneously relative to each other, creating multi-point extrusion and shearing of the graphite slurry, significantly increasing the peeling area and improving graphene yield. Simultaneously, each rotating roller has a corresponding cooling tank on its outer side to ensure uniform temperature across the peeling areas, preventing localized overheating. Furthermore, the rotating rollers and cooling tanks are designed to shorten the heat transfer path, enabling the bimetallic sheet to respond rapidly and improving the timeliness of temperature control.

[0023] This invention incorporates a scissor assembly between the slide plate and the carriage. When the bimetallic strip bends, it presses down on the pressure plate, and the lever amplification effect of the scissor rod pushes the slide plate to move, converting the minute bending displacement of the bimetallic strip into precise sliding of the slide plate, thereby improving the sensitivity of temperature response to flow regulation. At the same time, the third spring ensures reliable reset of the pressure plate, ensuring the repeatability of temperature control regulation. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0025] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0026] Figure 3 This is a schematic diagram of the first three-dimensional structure of the rotating cylinder assembly of the present invention.

[0027] Figure 4 This is a schematic diagram of the second three-dimensional structure of the rotating cylinder assembly of the present invention.

[0028] Figure 5 This is a schematic cross-sectional view of the rotating cylinder assembly structure of the present invention.

[0029] Figure 6 This is a schematic diagram of the three-dimensional structure of the rotating roller assembly of the present invention.

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of the cooling tank assembly of the present invention.

[0031] Figure 8 This is a schematic cross-sectional view of the cooling tank assembly structure of the present invention.

[0032] Figure 9 for Figure 8 A magnified structural diagram at point A.

[0033] Figure 10 This is a schematic cross-sectional view of the carriage assembly at the initial stage of the present invention.

[0034] Figure 11 This is a schematic cross-sectional view of the carriage assembly during the peeling process of the present invention.

[0035] Figure 12 This is a schematic cross-sectional view of the carriage assembly during heating according to the present invention.

[0036] In the diagram: 1. Base; 2. Fixed cylinder; 21. End cap; 22. Fixed shaft; 221. Feed pipe; 222. Discharge pipe; 23. First connecting pipe; 24. Second connecting pipe; 3. Rotating cylinder; 31. Blade; 4. Rotating roller; 41. Support frame; 5. Cooling tank; 51. Fixed rod; 52. First flow channel; 53. Second flow channel; 54. Slide plate; 541. Adjustment hole; 55. Graphite sealing strip; 551. First spring; 56. Connecting hole; 57. Slide; 571. Bimetallic strip; 572. Iron block; 573. Second spring; 574. Electromagnetic base; 575. Third spring; 576. Scissor bar; 577. Pressure plate. Detailed Implementation

[0037] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific configurations and algorithms presented below, but covers any modifications, substitutions, and improvements to elements, components, and algorithms without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description in order to avoid unnecessarily obscuring the invention.

[0038] Example 1, referring to Figures 1-12 In the first embodiment of the present invention, a graphene extraction apparatus for preparing heat dissipation film raw materials is provided. This graphene extraction apparatus for preparing heat dissipation film raw materials includes: Base 1; The fixed cylinder 2 is fixed on the base 1 and is provided with a first connecting pipe 23 and a second connecting pipe 24. A fixed shaft 22 is provided inside the cylinder along the axial direction. The rotating cylinder 3 is rotatably disposed inside the fixed cylinder 2, and has multiple blades 31 on the outside of one end; The rotating roller 4 is mounted on the fixed shaft 22 via the support frame 41 and is tangent to the inner wall of the rotating cylinder 3; Cooling tank 5 is fixed inside the fixed cylinder 2, and has a first flow channel 52 and a second flow channel 53 connected by a connecting hole 56 inside. The cooling tank 5 is provided with a graphite sealing strip 55 that abuts against the outer wall of the rotating cylinder 3 via a first spring 551, and a displacement sensor for monitoring the displacement of the graphite sealing strip 55. A slide 57 is slidably connected inside the cooling tank 5. A bimetallic strip 571 that fits into the cooling tank 5 is fixed on the slide 57. A sliding plate 54 is slidably provided at the connecting hole 56. An adjustment hole 541 is opened on the sliding plate 54. The cooling tank 5 and the slide 57 are respectively provided with an electromagnetic base 574 and an iron block 572 that cooperate with each other, and a second spring 573 is provided between the cooling tank 5 and the slide 57. When the electromagnetic base 574 is energized, the slide 57 is in the first position. The bending of the bimetallic strip 571 can drive the slide plate 54 to change the overlap range between the adjustment hole 541 and the connecting hole 56. When the electromagnetic base 574 is de-energized, the second spring 573 drives the slide 57 to move to the second position. In this position, the movement of the slide plate 54 cannot connect the adjustment hole 541 and the connecting hole 56.

[0039] The fixed shaft 22 is equipped with a feed pipe 221 and a discharge pipe 222, which extend into the interior of the rotating cylinder 3 through the middle of the fixed rod 51. The feed pipe 221 and the discharge pipe 222 extend into the interior of the rotating cylinder 3 along the axial direction of the fixed shaft 22 to avoid interference between the pipes and the rotating cylinder 3.

[0040] The rotating cylinder 3 and the rotating roller 4 rotate in opposite directions. The rotating roller 4 is made of an elastic material. The rotating roller 4 is made of rubber material, which can produce adaptive deformation during the extrusion process, so that the rotating roller 4 and the inner wall of the rotating cylinder 3 always maintain a good fit, avoiding damage to the graphene structure or equipment jamming due to hard contact.

[0041] The airflow generated when the blade 31 rotates is parallel to the axis of the rotating cylinder 3. This axial flow arrangement allows external air to enter through the first connecting pipe 23 and flow axially along the annular channel between the fixed cylinder 2 and the rotating cylinder 3, uniformly passing over the outer wall of the rotating cylinder 3 and the surface of the graphite sealing strip 55, achieving comprehensive and uniform auxiliary cooling and avoiding cooling dead zones.

[0042] During use, the graphite slurry, which is a mixture of graphite powder and viscous medium, is fed into the rotating cylinder 3 through the feed pipe 221. The rotating cylinder 3 and the rotating roller 4 are started and rotate relative to each other in opposite directions. The rotating roller 4 is made of elastic material and is tangential to the inner wall of the rotating cylinder 3, applying extrusion and shearing forces to the graphite slurry to achieve the peeling of graphene.

[0043] When the electromagnetic base 574 is energized, the slide 57 is in the first position. The first flow channel 52 and the second flow channel 53 in the cooling tank 5 are filled with coolant. In the initial state, the slide plate 54 closes the connecting hole 56, and the coolant does not flow. As the peeling continues, the heat generated by friction causes the temperature of the friction contact part between the rotating cylinder 3 and the rotating roller 4 to gradually rise. The bimetallic strip 571 bends due to heat, driving the slide plate 54 to move. This causes the overlap range between the adjusting hole 541 and the connecting hole 56 to gradually increase with the temperature rise. The coolant flow rate increases automatically, realizing real-time cooling of the temperature of the friction contact part between the rotating cylinder 3 and the rotating roller 4. This effectively controls the temperature of the friction contact part and prevents the polymer viscous medium in contact with it from carbonizing or thermally decomposing due to high temperature, thereby ensuring the purity of the graphene product and the peeling efficiency.

[0044] Meanwhile, as the rotating cylinder 3 rotates, it drives multiple blades 31 at its ends to rotate, drawing in external air through the first connecting pipe 23 and causing it to move axially along the outer wall of the rotating cylinder 3, and finally being discharged from the second connecting pipe. During this process, the flowing air simultaneously provides auxiliary cooling to the friction points between the outer wall of the rotating cylinder 3 and the graphite sealing strip 55, as well as the friction points between the rotating roller 4 and the inner wall of the rotating cylinder 3. The combined effect of air cooling and liquid cooling achieves cooling treatment of the friction points between the rotating roller 4 and the inner wall of the rotating cylinder 3, while also helping to cool the friction points between the outer wall of the rotating cylinder 3 and the graphite sealing strip 55, thus slowing down the wear and aging rate of the graphite sealing strip 55. Furthermore, the liquid cooling system automatically adjusts the cooling intensity according to the temperature, compensating for the shortcomings of air cooling which is affected by the ambient temperature.

[0045] After the graphene is peeled from the graphite powder, when the graphene slurry needs to be discharged, the rotating cylinder 3 is kept rotating, the electromagnetic base 574 is de-energized, and the second spring 573 drives the slide 57 to move to the second position, so that the adjusting hole 541 and the connecting hole 56 cannot be connected, and the flow of coolant automatically stops. At the same time, the first connecting pipe 23 and the second connecting pipe 24 are switched to heating medium to heat the rotating cylinder 3, reduce the viscosity of the internal solution, and facilitate the discharge of material. The rotating cylinder 3 drives the blades 31 to rotate and stir the heating medium, so as to avoid temperature stratification in the fixed cylinder 2 due to heat loss during the process of the heating medium flowing from the first connecting pipe 23 to the second connecting pipe 24, so as to make the heating uniform. After the material flowability is restored, the graphene slurry is discharged through the discharge pipe 222.

[0046] The discharged graphene slurry undergoes post-processing operations such as separation, washing, and drying to complete the extraction of graphene.

[0047] The rotating cylinder 3 drives multiple blades 31 to rotate around the rotation axis. On the one hand, during the process of peeling graphene, the rotation of the blades 31 introduces external cooling air to simultaneously provide auxiliary cooling to the friction contact parts between the outer wall of the rotating cylinder 3 and the graphite sealing strip 55, as well as the friction contact parts between the rotating roller 4 and the inner wall of the rotating cylinder 3. On the other hand, during the heating and discharging process, the rotation of the blades 31 agitates the heating medium, keeping the temperature of the heating medium in the fixed cylinder 2 consistent, avoiding the phenomenon of hot and cold stratification, ensuring uniform heating, and improving the discharging efficiency.

[0048] In summary, the bimetallic strip 571 automatically adjusts the coolant flow rate according to the temperature, realizing real-time tracking control of the cooling flow rate to the peeling temperature. This effectively avoids the carbonization or thermal decomposition of the high-molecular viscous medium due to high temperature, ensuring the purity of the graphene product and the peeling efficiency. The auxiliary air cooling generated by the blade 31, combined with the liquid cooling, effectively reduces the working temperature of the graphite sealing strip 55 and slows down its wear and aging rate. The first spring 551 continuously pushes the graphite sealing strip 55 to keep it in contact with the outer wall of the rotating cylinder 3, ensuring the sealing effect. After the electromagnetic base 574 is de-energized, the coolant automatically stops flowing, the heating medium switches and cooperates with the blade 31 to stir, achieving uniform heating and rapid discharge, reducing material waste and improving production efficiency.

[0049] Multiple rotating rollers 4 and cooling tanks 5 are provided, evenly distributed along the circumference of the fixed cylinder 2. The cooling tanks 5 are correspondingly located on the outer side of the corresponding rotating roller 4. The rotating rollers 4 and cooling tanks 5 adopt a multi-point layout, with multiple rotating rollers 4 simultaneously contacting the inner wall of the rotating cylinder 3, forming multi-point extrusion and shearing, which greatly increases the peeling area and improves the graphene yield. At the same time, each rotating roller 4 has a corresponding cooling tank 5 on its outer side, which can promptly remove the frictional heat generated in each peeling area, ensuring uniform temperature in each area and avoiding local overheating. In addition, the rotating rollers 4 and cooling tanks 5 are arranged in a one-to-one correspondence and close proximity, shortening the heat transfer path and enabling the bimetallic sheet 571 to respond quickly to temperature changes, improving the timeliness of temperature control.

[0050] The fixed cylinder 2 has a detachable end cap 21 at its end, through which an inlet pipe and an outlet pipe communicate with the first flow channel 52 and the second flow channel 53. The detachable design of the end cap 21 facilitates the installation, maintenance, and replacement of internal components such as the rotating cylinder 3, rotating roller 4, and cooling tank 5. The inlet and outlet pipes pass through the end cap 21 and directly communicate with the first flow channel 52 and the second flow channel 53 in the cooling tank 5. External coolant enters the cooling tank 5 through the inlet pipe, completes heat exchange, and is discharged through the outlet pipe, forming an independent coolant circulation loop that does not interfere with other fluids in the fixed cylinder 2, ensuring the stability of the cooling system operation.

[0051] Regarding the rotation drive of the rotating cylinder 3 and the rotating roller 4, in this preferred embodiment, one end of the rotating cylinder 3 is driven by an external motor via belt transmission. A first gear is fixed on the rotating cylinder 3, and a second gear is coaxially fixed on each rotating roller 4. Multiple second gears mesh with the outside of the first gear, so that when the rotating cylinder 3 rotates, the rotating roller 4 is rotated through the meshing transmission of the gears, and the two rotate in opposite directions. Furthermore, the rotating cylinder 3 is equipped with a partition to isolate the stripping chamber and the transmission chamber, to prevent the slurry from clogging the transmission structure and to ensure the stable operation of the equipment.

[0052] Flexible heat-conducting films are connected between the graphite sealing strip 55 and the cooling tank 5, as well as between the cooling tank 5 and the bimetallic strip 571, to achieve rapid and effective heat transfer. The second spring 573 is made of non-magnetic material to avoid the magnetic attraction generated by the electromagnetic base 574 from affecting it.

[0053] Example 2, refer to Figures 8-12 This is the second embodiment of the present invention, which differs from the first embodiment in that: The displacement sensor is electrically connected to the electromagnetic base 574 and the motor that drives the rotating cylinder 3. When the displacement sensor detects that the displacement of the graphite sealing strip 55 reaches the set threshold, it controls the electromagnetic base 574 to be de-energized and stops the rotation of the rotating cylinder 3.

[0054] During use, the first spring 551 continuously pushes the graphite sealing strip 55 to keep it in contact with the outer wall of the rotating cylinder 3. The displacement sensor monitors the displacement of the graphite sealing strip 55 in real time. As the equipment runs continuously, the graphite sealing strip 55 gradually wears down, and the first spring 551 pushes it to move towards the rotating cylinder 3. The displacement value detected by the displacement sensor increases accordingly.

[0055] When the graphite sealing strip 55 wears to a certain extent, the displacement sensor detects that the displacement has reached the set threshold and sends a signal to control the electromagnetic base 574 to cut off power and stop the rotation of the rotating cylinder 3. At this time, the equipment automatically stops, prompting the operator to replace the graphite sealing strip 55 in time to avoid coolant leakage due to seal failure, prevent abnormal high temperature caused by insufficient cooling during the peeling process, ensure the purity of the graphene product in the rotating cylinder, and ensure the safe operation of the equipment.

[0056] The remaining structure is the same as that in Example 1.

[0057] Example 3, referring to Figures 9-12 This is the third embodiment of the present invention, which differs from the second embodiment in that: A scissor lift assembly is provided between the slide 54 and the carriage 57. The scissor lift assembly includes at least one scissor lift unit, which consists of two scissor lift rods 576 rotatably connected at the center.

[0058] A slider is vertically slidably connected to one end of the slide plate 54, and a pressure plate 577 is vertically slidably connected to the slide frame 57. A third spring 575 is connected between the bottom of the pressure plate 577 and the slide frame 57. The pressure plate 577 is located below the bent end of the bimetallic strip 571. The scissor lift assembly has four ends. The two ends at the bottom are rotatably connected to the slide plate 54 and the carriage 57, respectively, and the two ends at the top are rotatably connected to the slider and the pressure plate 577, respectively.

[0059] During use, when the heat generated by peeling raises the temperature of the friction contact area between the rotating cylinder 3 and the rotating roller 4, the bimetallic strip 571 bends due to heat. Its bent end presses down on the pressure plate 577. The pressure plate 577 is vertically slidably connected to the slide 57. A third spring 575 is provided at its bottom for resetting. When the pressure plate 577 moves down, it drives the end of the scissor bar 576, which is rotatably connected to it, to move downward. The lever effect of the scissor bar 576 converts the vertical displacement into a horizontal thrust, pushing the slide plate 54 to move horizontally, so that the adjusting hole 541 and the connecting hole 56 gradually coincide. The small bending displacement of the bimetallic strip 571 is converted into the precise sliding of the slide plate 54 through the amplification effect of the scissor assembly, which improves the sensitivity of temperature response to flow regulation. As the temperature drops, the bimetallic strip 571 gradually returns to its flat position, and the pressure plate 577 resets upward under the drive of the third spring 575. The scissor assembly moves in the opposite direction, causing the slide plate 54 to reset. The overlap range between the adjusting hole 541 and the connecting hole 56 decreases accordingly, and the coolant flow rate automatically decreases.

[0060] A scissor assembly is installed between the slide plate 54 and the carriage 57. When the bimetallic strip 571 bends, it presses down on the pressure plate 577. The lever amplification effect of the scissor rod 576 pushes the slide plate 54 to move, converting the small bending displacement of the bimetallic strip 571 into the precise sliding of the slide plate 54. This improves the responsiveness of temperature to flow regulation, making the coolant flow regulation more accurate and timely. At the same time, the third spring 575 ensures that the pressure plate 577 is reliably reset, ensuring the repeatability and long-term stability of temperature control regulation.

[0061] The remaining structure is the same as that in Example 2.

[0062] A method for extracting graphene for preparing heat dissipation film raw materials includes the following steps: Step 1: Mix graphite powder and viscous medium to form graphite slurry, and then pass the mixed graphite slurry into the rotating cylinder 3. Start the rotating cylinder 3 and the rotating roller 4 so that they rotate relative to each other. The graphite slurry is subjected to compression and shearing between the inner wall of the rotating cylinder 3 and the rotating roller 4, which crushes the graphite powder composed of multiple layers of graphene into single layers of graphene, thereby achieving the exfoliation process of graphene. Step 2: The electromagnetic base 574 is energized, the slide 57 is in the first position, and the first flow channel 52 and the second flow channel 53 in the cooling tank 5 are filled with coolant. Initially, the connecting hole 56 is closed by the sliding plate 54. When the heat generated by peeling causes the temperature to rise, the bimetallic strip 571 is heated and bent, driving the sliding plate 54 to move, so that the overlap range between the adjusting hole 541 and the connecting hole 56 gradually increases, and the coolant flow rate is automatically increased. Meanwhile, as the rotating cylinder 3 drives the blades 31 to rotate, it pushes the air axially, allowing the external air to enter the fixed cylinder 2 through the first connecting pipe 23. During the axial pushing process, the rotating cylinder 3 and the graphite sealing strip 55 are cooled. Finally, the air is discharged from the second connecting pipe 24. Step 3: Keep the rotating cylinder 3 rotating, de-energize the electromagnetic base 574, and drive the slide 57 to move to the second position, so that the adjusting hole 541 and the connecting hole 56 cannot be connected, stop the flow of coolant, and then switch the first connecting pipe 23 and the second connecting pipe 24 to the heating medium to heat the rotating cylinder 3, reduce the viscosity of the internal solution, and facilitate discharge. At the same time, the rotating cylinder 3 drives the blades 31 to rotate and stir the heating medium, avoiding temperature stratification in the fixed cylinder 2, so as to make the heating uniform. After the material flowability is restored, the graphene slurry is discharged through the discharge pipe 222. Step 4: Perform post-processing operations such as separation, washing, and drying on the discharged graphene slurry to complete the graphene extraction process.

[0063] Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art, based on a study of the drawings, specification, and claims, should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to identify names rather than to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A graphene extraction apparatus for preparing raw materials for heat dissipation films, characterized in that, include: Base; A fixed cylinder is fixed on a base and is provided with a first connecting pipe and a second connecting pipe. A fixed shaft is provided inside the cylinder along the axial direction. A rotating cylinder is rotatably mounted inside a fixed cylinder, with multiple blades on the outside of one end. The rotating roller is mounted on a fixed shaft via a support frame and is tangent to the inner wall of the rotating cylinder. The cooling tank is fixed inside the fixed cylinder and has a first flow channel and a second flow channel connected by a connecting hole. The cooling tank is provided with a graphite sealing strip that abuts against the outer wall of the rotating cylinder via a first spring, and a displacement sensor for monitoring the displacement of the graphite sealing strip; A slide frame is slidably connected inside the cooling tank, and a bimetallic strip that fits into the cooling tank is fixed on the slide frame. A slide plate is slidably provided at the connecting hole, and an adjustment hole is opened on the slide plate. The cooling tank and the slide are respectively equipped with an electromagnetic base and an iron block that cooperate with each other, and a second spring is provided between the cooling tank and the slide; When the electromagnetic base is energized, the slide is in the first position, and the bending of the bimetallic strip can drive the slide plate to change the overlap range between the adjustment hole and the connecting hole. When the electromagnetic base is de-energized, the second spring drives the slide to move to the second position. In this position, the movement of the slide plate cannot connect the adjustment hole and the connecting hole.

2. The graphene extraction device for preparing heat dissipation film raw materials according to claim 1, characterized in that: The fixed shaft is provided with a feed pipe and a discharge pipe, which extend into the interior of the rotating cylinder through the middle of the fixed rod.

3. The graphene extraction device for preparing heat dissipation film raw materials according to claim 1, characterized in that: The rotating cylinder and the rotating roller rotate in opposite directions, and the rotating roller is made of an elastic material.

4. The graphene extraction device for preparing heat dissipation film raw materials according to claim 1, characterized in that: The displacement sensor is electrically connected to the electromagnetic base and the motor that drives the rotating cylinder. When the displacement sensor detects that the displacement of the graphite sealing strip reaches a set threshold, it controls the electromagnetic base to be de-energized and stops the rotation of the rotating cylinder.

5. The graphene extraction apparatus for preparing heat dissipation film raw materials according to claim 1, characterized in that: The airflow generated when the blades rotate is parallel to the axial direction of the rotating cylinder.

6. The graphene extraction apparatus for preparing heat dissipation film raw materials according to claim 1, characterized in that: Multiple rotating rollers and cooling grooves are provided and are evenly distributed along the circumference of the fixed cylinder. The cooling grooves are respectively arranged on the outer side of the corresponding rotating roller.

7. The graphene extraction apparatus for preparing heat dissipation film raw materials according to claim 1, characterized in that: The fixed cylinder is provided with a detachable end cap, through which an inlet pipe and an outlet pipe communicate with the first flow channel and the second flow channel.

8. The graphene extraction apparatus for preparing heat dissipation film raw materials according to claim 1, characterized in that: A scissor lift assembly is provided between the slide and the carriage. The scissor lift assembly includes at least one scissor lift unit, which consists of two scissor lifts rotatably connected at the center.

9. The graphene extraction apparatus for preparing heat dissipation film raw materials according to claim 8, characterized in that: A slider is vertically slidably connected to one end of the slide plate, and a pressure plate is vertically slidably connected to the slide frame. A third spring is connected between the bottom of the pressure plate and the slide frame. The pressure plate is located below the bent end of the bimetallic strip. The scissor lift assembly has four ends, with the two ends at the bottom being rotatably connected to the slide plate and the carriage, respectively, and the two ends at the top being rotatably connected to the slider and the pressure plate, respectively.

10. An extraction method using the graphene extraction apparatus for preparing heat dissipation film raw materials as described in claim 2, characterized in that, Includes the following steps: Step 1: Mix graphite powder and viscous medium to form graphite slurry, and then pass the mixed graphite slurry into the rotating cylinder. Start the rotating cylinder and rotating roller to make them rotate relative to each other. The graphite slurry is subjected to compression and shearing between the inner wall of the rotating cylinder and the rotating roller, which crushes the graphite powder composed of multiple layers of graphene into single layers of graphene, thus realizing the exfoliation process of graphene. Step 2: The electromagnetic base is powered on, the slide is in the first position, and the first and second flow channels in the cooling tank are filled with coolant. Initially, the connecting hole is blocked by the sliding plate. When the heat generated by peeling causes the temperature to rise, the bimetallic strip is heated and bent, driving the sliding plate to move, so that the overlap range between the adjusting hole and the connecting hole gradually increases, automatically increasing the coolant flow rate. Meanwhile, as the rotating cylinder drives the blades to rotate, it pushes the air axially, allowing the external air to enter the fixed cylinder through the first connecting pipe. During the axial pushing process, the rotating cylinder and the graphite sealing strip are cooled. The air is finally discharged from the second connecting pipe. Step 3: Keep the rotating cylinder rotating, de-energize the electromagnetic base, and the second spring drives the slide to move to the second position, so that the adjusting hole and the connecting hole cannot be connected, stopping the flow of coolant. Then switch the first connecting pipe and the second connecting pipe to the heating medium to heat the rotating cylinder, reduce the viscosity of the internal solution, and facilitate its discharge. At the same time, the rotating cylinder drives the blades to rotate and stir the heating medium, avoiding temperature stratification in the fixed cylinder and ensuring uniform heating. After the material flowability is restored, the graphene slurry is discharged through the discharge pipe. Step 4: Perform post-processing operations such as separation, washing, and drying on the discharged graphene slurry to complete the graphene extraction process.

Images