A pulverizing device for preparing high-expandable graphite

Abstract

This invention belongs to the field of novel graphite material technology, specifically a pulverizing device for preparing high-ratio expandable graphite, including a roller pulverizing device. The roller pulverizing device includes a machine body with a feed inlet at the top and a discharge outlet at the bottom. Pulverizing rollers are symmetrically arranged in the pulverizing chamber inside the machine body, and the ends of the pulverizing rollers are connected to a drive motor on the outside of the machine body. Addressing the processing requirement of preserving the complete flake structure during the preparation of high-ratio expandable graphite, this application employs a roller pulverizing device. This allows the graphite raw material particles passing through the gaps to be subjected to slow, flexible compression by the pulverizing rollers on both sides, promoting friction and collision between the internal components of the graphite raw material particles. This process processes the graphite raw material particles to a predetermined size standard without causing excessive breakage, thus improving the quality of the high-ratio expandable graphite material obtained through subsequent high-temperature expansion treatment.

Description

Technical Field

[0001] This invention belongs to the field of novel graphite material technology, specifically a pulverizing device for preparing high-expandable graphite. Background Technology

[0002] As a novel functional carbon material, expanded graphite is a loose, porous, worm-like substance obtained from natural graphite flakes through intercalation, washing, drying, and high-temperature expansion. In addition to possessing the excellent properties of natural graphite, such as resistance to heat and cold, corrosion resistance, and self-lubrication, expanded graphite also exhibits properties not found in natural graphite, including softness, compression resilience, adsorption, environmental compatibility, biocompatibility, and radiation resistance.

[0003] Expanded graphite can expand 150-300 times in volume instantly when exposed to high temperatures, changing from flake-like to worm-like, thus making its structure loose, porous and curved, increasing its surface area, surface energy, and adsorption of flake graphite. The worm-like graphite can interlock with each other, which increases its softness, resilience and plasticity.

[0004] In the preparation of high-ratio expandable graphite, the mined graphite raw material ore needs to be crushed and screened. In order to ensure the quality of the final product, the large-sized complete flake structure of graphite needs to be preserved during the processing. However, the existing high-impact and high-extrusion crushing equipment is prone to over-crushing of graphite raw materials, thereby affecting the quality and yield of the final high-ratio expandable graphite. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a pulverizing device for preparing high-ratio expandable graphite.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention proposes a pulverizing device for preparing high-ratio expandable graphite, including a roller pulverizing device. The roller pulverizing device includes a machine body, with a feed inlet at the top and a discharge outlet at the bottom. Pulverizing rollers are symmetrically arranged in the pulverizing chamber inside the machine body, and the ends of the pulverizing rollers are connected to a drive motor on the outside of the machine body. A fixed frame is provided inside the crushing chamber in the gap area between the crushing roller and the inner wall of the crushing chamber. A cleaning roller is rotatably mounted on the fixed frame. The fixed frame is connected to the output end of a telescopic device provided inside the crushing chamber. A pull-out box is provided on the upper side of the discharge port. The pull-out box is slidably connected to the inner wall of the discharge port at the bottom of the crushing chamber. A screening layer is provided inside the pull-out box. The screening layer has a mesh structure and is used to separate graphite raw materials that do not meet the size requirements. The cleaning roller surface is uniformly provided with cleaning scrapers, and the sharp part of the curved end of the cleaning scraper contacts the surface of the cleaning roller.

[0007] Preferably, the end of the cleaning scraper is made of a hard material, while the part of the cleaning scraper near the cleaning roller is made of an elastic material, and the surface of the crushing roller is made of a smooth metal material.

[0008] Preferably, the cleaning roller is hollow inside, and a limiting ring is provided at the center of the hollow area. The limiting ring divides the hollow area inside the cleaning roller into an inflation area surrounded by the limiting ring and an air extraction area outside the limiting ring. An air pump device is provided on the limiting ring. The air inlet of the air pump device is connected to the air extraction area, the air outlet is connected to the inflation area, and the air extraction area is connected to the outside. An impact hole is provided on the conical end of the cleaning scraper, and the impact hole communicates with an air chamber provided inside the end area of ​​the cleaning scraper. The air chamber and the air chamber are connected by an air pipe.

[0009] Preferably, suction holes are uniformly provided on the surface of the curved part of the cleaning scraper near the cleaning roller, and the suction holes are connected to the interior of the air extraction zone.

[0010] Preferably, a layer of intercepting mesh is provided on the surface of the cleaning scraper located outside the suction hole. One side of the intercepting mesh is connected to the end of the cleaning scraper, and the other end is connected to the joint between the cleaning scraper and the cleaning roller. The intercepting mesh is made of elastic material.

[0011] Preferably, the pull-out box has a square frame structure, and the screening layer on the inner wall of the pull-out box has a double-layer structure, consisting of an upper screening screen and a lower screening screen; the aperture of the upper screening screen is larger than that of the lower screening screen, and the gap area between the upper and lower screening screens is a crushing zone, and a crushing plate is uniformly arranged inside the crushing zone, and the end of the crushing plate is connected to the output end of a rotating device provided on the inner wall of the pull-out box.

[0012] Preferably, the crushing plate has an elliptical cross-section, with the major axis of the ellipse being longer than the distance between the upper and lower screens, and the minor axis being shorter than the distance between the upper and lower screens; the surface of the crushing plate is smoothed.

[0013] Preferably, the crushing zone is filled with elastic crushing particles, which are spherical and have a particle size larger than the aperture of the lower screen and smaller than the aperture of the upper screen.

[0014] Preferably, the outer surface of the crushing plate is uniformly provided with crushing blocks, and the surface of the crushing blocks is arc-shaped.

[0015] The beneficial effects of this invention are as follows: This invention discloses a pulverizing device for preparing high-ratio expandable graphite. Addressing the processing requirement of preserving the intact flake structure and avoiding excessive crushing of the raw material's flake structure during the preparation of high-ratio expandable graphite, this application employs a roller crushing device. After pre-treatment involving coarse and medium crushing, the graphite raw material particles are fed into the feed inlet at the top of the machine body and then flow downwards into the gap area between symmetrical crushing rollers. The gap size between the crushing rollers is set, and the rollers are controlled to rotate slowly. This allows the graphite raw material particles passing through the gap to be subjected to slow, gentle compression by the crushing rollers on both sides, promoting internal friction and collision between the graphite raw material particles. This process processes the graphite raw material particles to a predetermined size standard without causing excessive crushing, thus improving the quality of the high-ratio expandable graphite material obtained through subsequent high-temperature expansion treatment. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a cross-sectional view of the cleaning roller in this invention; Figure 5 yes Figure 4 A magnified view of a section at point B in the middle; Figure 6 This is a perspective view of the pull-out box in this invention; Figure 7 This is a schematic diagram of the cooperation between the fixing frame and the cleaning roller in this invention.

[0018] In the diagram: 1. Machine body, 11. Feed inlet, 12. Discharge outlet, 13. Crushing chamber, 14. Crushing roller, 2. Fixing frame, 21. Cleaning roller, 211. Inflation zone, 212. Cleaning scraper, 22. Impact hole, 221. Inflation chamber, 222. Suction hole, 223. Interception net, 224. Restriction ring, 23. Inflation pipe, 231. Pull-out box, 31. Screening layer, 32. Upper screen, 33. Lower screen, 34. Crushing zone, 35. Crushing plate, 351. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: As shown in the attached diagram of the instruction manual. Figures 1-7 As shown, a high-ratio expandable graphite preparation crushing device includes a roller crushing device. The roller crushing device includes a machine body 1. The top of the machine body 1 is provided with a feed inlet 11 and the bottom is provided with a discharge outlet 12. Crushing rollers 14 are symmetrically arranged in the crushing chamber 13 inside the machine body 1. The ends of the crushing rollers 14 are connected to the drive motor outside the machine body 1. The symmetrical crushing rollers 14 rotate in opposite directions to crush the graphite raw material passing through the intermediate gap. A fixed frame 2 is provided in the gap area between the crushing roller 14 and the inner wall of the crushing chamber 13. A cleaning roller 21 is rotatably mounted on the fixed frame 2. The fixed frame 2 is connected to the output end of the telescopic device provided inside the crushing chamber 13. The telescopic device here can be an electric telescopic rod device, which is controlled by an external controller to drive the fixed frame 2 and the cleaning roller 21 to move laterally. A pull-out box 3 is provided on the upper side of the discharge port 12. The pull-out box 3 is slidably embedded into the groove provided in the inner wall of the crushing chamber 13, and its end protrudes from the opening provided in the inner wall of the crushing chamber 13. It is normally kept locked. When needed, it can be slid out to take out the large-sized graphite raw material agglomerates enriched therein for repeated cleaning. The pull-out box 3 is provided with a screening layer 31. The screening layer 31 has a mesh structure to separate graphite raw materials that do not meet the size requirements. Cleaning scrapers 22 are evenly provided on the surface of the cleaning roller 21. The sharp part of the curved end of the cleaning scraper 22 contacts the surface of the cleaning roller 21.

[0021] Specific workflow: In the preparation of high-ratio expandable graphite, it is necessary to retain the complete flake structure and avoid excessive crushing of the raw material flake structure. Compared with the existing technology that uses strong impact and strong extrusion crushing equipment, this application adopts a roller crushing device. After the graphite raw material is pre-treated by coarse and medium crushing, the processed graphite raw material particles are fed into the feed port 11 at the top of the machine body 1, and then flow downward into the gap area between the symmetrical crushing rollers 14. The gap size between the crushing rollers 14 is set, and the crushing rollers 14 are controlled to rotate slowly. This allows the graphite raw material particles passing through the gap to be subjected to slow and flexible extrusion by the crushing rollers 14 on both sides, which promotes mutual friction and collision between the internal parts of the graphite raw material particles. This process the graphite raw material particles to the predetermined size standard without causing excessive crushing of the raw material particles, thus improving the quality of the high-ratio expandable graphite material obtained by the subsequent high-temperature expansion treatment. Furthermore, considering that graphite raw materials have inherent lubricating and adhesive properties, when they come into contact with the smooth surface of the crushing roller 14 during the extrusion process, some graphite raw materials tend to adhere to the surface of the crushing roller 14 due to the pressure. This portion of graphite raw material is easily flattened and stretched under the extrusion, forming a layer of graphite film-like adhesive that adheres to the surface of the crushing roller 14. This can easily lead to a decrease in the smoothness and flatness of the surface of the crushing roller 14, resulting in uneven extrusion of the graphite raw material in the gap area between the crushing rollers 14, thus affecting the crushing effect of the graphite raw material. Therefore, this application provides a cleaning scraper 22 to scrape and clean the film-like adhesive on the surface of the crushing roller 14 to ensure the normal operation of the crushing roller 14. Specifically, the telescopic device is activated periodically to move the cleaning roller 21 closer to the surface of the crushing roller 14, and the motor connected to the end of the cleaning roller 21 is activated to cause the cleaning roller 21 to rotate in the opposite direction relative to the crushing roller 14. The end of the cleaning scraper 22 on the surface of the cleaning roller 21 contacts the surface of the cleaning roller 21 and scrapes off the graphite adhering to the surface of the cleaning roller 21. Because the cleaning scraper 22 is curved and the direction of action of the conical end of the cleaning scraper 22 is close to the tangential direction of the arc surface of the crushing roller 14, the conical end of the cleaning scraper 22 can more easily embed into the gap between the film-like adhering material and the crushing roller 14, and effectively peel off the film-like adhering material. This process improves efficiency and avoids direct impact of the cleaning scraper 22 end on the crushing roller 14 surface, reducing wear on both surfaces. The scraped graphite raw material detaches from the cleaning roller 21 under centrifugal force and falls onto the upper side of the screening layer 31. Graphite raw material particles that meet the size requirements pass through the mesh structure of the screening layer 31 and exit from the discharge port 12, while graphite raw material that does not meet the size requirements is collected on the upper side of the screening layer 31. The pull-out box 3 can be periodically removed, and the collected graphite particles can be re-input from the feed port 11 for further processing. This further improves the yield and ensures continuous processing of graphite raw materials.

[0022] Example 2: Based on Embodiment 1, the end of the cleaning scraper 22 is made of a hard material, such as the scraper material of the prior art for forcefully cleaning the crushing roller 14, while the joint part of the cleaning scraper 22 near the cleaning roller 21 is made of an elastic material. When the strength requirement is high, spring steel can be used, and when the requirement is low, wear-resistant elastic rubber can be used. Specific workflow: Based on the specific workflow in Example 1, by setting the conical end of the cleaning scraper 22 to be made of hard material with good rigidity, it can maintain its shape while contacting the surface of the crushing roller 14, forming a concentrated scraping action to smoothly scrape off the adhering material on the surface of the crushing roller 14. The connection between the cleaning scraper 22 and the cleaning roller 21 is made of elastic material. When the cleaning scraper 22 and the crushing roller 14 are in contact and the mutual squeezing force is large, the joint of the cleaning scraper 22 can undergo a small degree of bending deformation. This can effectively alleviate the interaction force between the cleaning scraper 22 and the crushing roller 14, reduce the wear between the contact parts, and as the cleaning roller 21 rotates, when the cleaning scraper 22 leaves the contact gap, the elastic deformation recovers and drives the elastic vibration of the cleaning scraper 22, which can shake off the graphite material adhering to the cleaning scraper 22, reduce the amount of graphite material adhering to the surface of the cleaning scraper 22, and thus ensure the normal operation of the cleaning scraper 22.

[0023] Example 3: Based on Embodiment 2, the cleaning roller 21 is hollow inside, and a limiting ring 23 is provided at the center of the hollow area. The limiting ring 23 divides the hollow area inside the cleaning roller 21 into an inflation area 211 surrounded by the limiting ring 23 and an air extraction area 212 outside the limiting ring 23. A miniature air pump device is fixedly installed on the limiting ring 23. The air inlet end of the air pump device is connected to the air extraction area 212, and the air outlet end is connected to the inflation area 211. The air extraction area 212 is connected to the outside. An impact hole 221 is provided on the conical end of the cleaning scraper 22. The impact hole 221 is connected to an inflation chamber 222 provided inside the end area of ​​the cleaning scraper 22. The inflation chamber 222 is connected to the inflation area 211 through an inflation pipe 231 with a flexible tube structure.

[0024] Specific workflow: Based on the specific workflow in Example 2, as the air pump is started, the airflow inside the suction zone 212 is drawn into the inflation zone 211, increasing the air pressure in the inflation zone 211. This causes the airflow in the inflation zone 211 to be sent along the inflation pipe 231 into the inflation chamber 222 located at the end of the cleaning scraper 22, and then out through the impact hole 221 at the end of the cleaning scraper 22. Thus, as the cleaning scraper 22 rotates, it scrapes away the film-like adhering material on the surface of the crushing roller 14, and the conical end of the cleaning scraper 22 embeds into the film-like material. When there is a gap between the adhesive and the crushing roller 14, the impact airflow released from the impact hole 221 penetrates into the gap between the film-like adhesive and the crushing roller 14, accelerating the elimination of the adhesion between the film-like adhesive and the surface of the crushing roller 14, expanding the coverage of the peeling action in the gap area, and promoting the peeling of the entire film-like adhesive; and the impact airflow released from the impact hole 221 acts on the contact gap between the end of the cleaning scraper 22 and the surface of the crushing roller 14, improving the cleaning effect while also reducing the scraping wear between the cleaning scraper 22 and the surface of the crushing roller 14.

[0025] Example 4: Based on Embodiment 3, suction holes 223 are uniformly provided on the surface of the curved part of the cleaning scraper 22 near the cleaning roller 21, and the suction holes 223 communicate with the interior of the suction zone 212; a layer of intercepting net 224 is provided on the part of the surface of the cleaning scraper 22 located outside the suction holes 223, one side of the intercepting net 224 is connected to the end of the cleaning scraper 22, and the other end is connected to the joint between the cleaning scraper 22 and the cleaning roller 21, and the intercepting net 224 is made of elastic material.

[0026] Specific workflow: Based on the specific workflow in Embodiment 3, by setting suction holes 223 distributed on the curved surface of the cleaning scraper 22, the airflow released from the impact hole 221 at the end of the cleaning scraper 22 impacts the film-like adhesive and then flows to the inner side of the curved cleaning scraper 22 where the suction hole 223 is located. After penetrating the interception net 224, it enters the suction zone 212, forming an airflow circulation. In this airflow circulation path, the film-like adhesive is impacted from the inside out in the gap direction and then attracted in the direction of the curved part of the cleaning scraper 22, which causes the film-like adhesive to peel off from the surface of the crushing roller 14 at an accelerated speed and then move towards the inner side of the curved cleaning scraper 22. This forms a continuous peeling action, which is conducive to peeling off the film-like adhesive more completely and achieving thorough cleaning of the surface of the crushing roller 14. Furthermore, the intercepting net 224 arranged outside the suction hole 223 can separate the raw material particles mixed in the circulating airflow. The intercepting net 224 is elastic, and its two side edges are connected to the hard part of the cleaning scraper 22 end and the joint surface between the scraper and the crushing roller 14, respectively. As the cleaning scraper 22 contacts the surface of the crushing roller 14 and is pressed, it bends and deforms. After leaving the crushing roller 14, it recovers its elastic deformation. The above process is repeated continuously, so that the intercepting net 224 continuously changes between the stretched and deformed state and the relaxed state after deformation. This accelerates the separation of graphite raw materials adhering to the surface of the intercepting net 224. This can effectively prevent graphite raw material particles from continuously adhering to the surface of the intercepting net 224 and affecting the passage of the intercepting net 224, ensuring the circulation of airflow and facilitating the continuous cleaning of the surface of the crushing roller 14.

[0027] Example 5: Based on Embodiment 4, the pull-out box 3 has a square frame structure, and the screening layer 31 on the inner wall of the pull-out box 3 has a double-layer structure, including an upper screening mesh 32 and a lower screening mesh 33. The aperture of the upper screening mesh 32 is larger than that of the lower screening mesh 33, and the gap area between the upper screening mesh 32 and the lower screening mesh 33 is a crushing zone 34. A crushing plate 35 is provided inside the crushing zone 34. The end of the crushing plate 35 is connected to the output end of a rotating device provided on the inner wall of the pull-out box 3. The rotating device can be a miniature motor device and is installed inside the frame structure of the pull-out box 3. The cross-section of the crushing plate 35 is elliptical, and the length of the major axis of the ellipse is greater than the distance between the upper screening mesh 32 and the lower screening mesh 33, and the length of the minor axis of the ellipse is less than the distance between the upper screening mesh 32 and the lower screening mesh 33. The surface of the crushing plate 35 is smoothed.

[0028] Specific workflow: Based on the specific workflow in Example 4, because the squeezing action on both sides of the crushing roller 14 is controlled in a slow and flexible state, and due to the characteristics of the graphite raw material itself, the graphite raw material processed by the crushing roller 14 is prone to mutual squeezing and adhesion into sheet-like agglomerates. These agglomerates may contain graphite raw material parts whose size meets the output requirements and raw material parts whose size is larger than the output requirements and need to be crushed again. These different raw materials adhere and agglomerate together, making them difficult to separate. Therefore, this application sets the screening layer 31 as a double-layer structure, and the mesh size of the lower screening screen 33 corresponds to the size of the graphite raw material that meets the discharge requirements, so as to separate the graphite raw material that meets the discharge requirements. The upper screening screen 32 has a larger aperture, which can facilitate the penetration of larger agglomerates and confine them to the middle crushing zone 34. Then, the rotating device connected to the crushing plate 35 can be started to drive the crushing plate 35 to rotate. The rotating crushing plate 35 squeezes and stirs the large agglomerates accumulated inside the crushing zone 34, so that they are broken down and dispersed. This causes the part of the aggregate that meets the discharge standard to continue to penetrate the lower screening screen 33 and leave, so as to achieve effective screening of the accumulated graphite raw material. Furthermore, the smooth surface of the crushing plate 35 and its slow start-up avoid concentrated and intense impact on the surrounding graphite agglomerates, thus ensuring the integrity of the large-sized flake structure of the graphite particles. When the crushing plate 35 rotates vertically, the two ends of its elliptical structure press against and squeeze the upper and lower screens 32 and 33, causing the pressure points to bulge and increasing the space of the crushing zone 34. When rotated to a horizontal position, the pressure on the upper and lower screens 32 and 33 is removed, and the space of the crushing zone 34 returns to normal. By setting up evenly distributed crushing plates 35 connected and rotating independently, the rotation speed of each crushing plate 35 varies, achieving localized crushing in the crushing zone 34. The reciprocating motion of the grinding zone 34 disperses and agitates the graphite aggregates. This reciprocating motion, along with the changes in the internal space of the grinding zone 34 and the reciprocating deformation of the upper and lower screens 32 and 33, causes the graphite aggregates inside the grinding zone 34 to flow and collide with each other, accelerating the decomposition and refinement of the aggregates. It also accelerates the crushing and refinement of large-sized graphite particles under self-grinding, achieving the predetermined size and improving the processing effect of graphite raw materials. Finally, after processing for a period of time, the pull-out box 3 can be removed, and the remaining large-volume graphite particles can be screened and then reintroduced through the feed inlet 11 for another round of crushing and processing, thereby increasing the output rate of the crushed graphite raw materials.

[0029] Example 6: Based on Example 5, the crushing zone 34 is filled with elastic crushing particles. The crushing particles are spherical, and the particle size is larger than the aperture of the lower screen 33 and smaller than the aperture of the upper screen 32. Crushing blocks 351 are uniformly arranged on the outer surface of the crushing plate 35, and the surface of the crushing blocks 351 is arc-shaped. Specific workflow: Based on the specific workflow in Example 5, in order to improve the crushing efficiency of agglomerates inside the crushing zone 34, spherical crushing particles are filled into the crushing zone 34 and kept in motion under the action of the rotating crushing plate 35. In this way, the graphite agglomerates entering the crushing zone 34 will be subjected to the impact and agitation of the crushing particles, and further refined and decomposed. At the same time, arc-shaped crushing blocks 351 are uniformly arranged on the outer surface of the crushing plate 35 to improve the friction and impact during the contact process between the crushing plate 35 and the upper screen 32 and the lower screen 33, and further reduce the adhesion of graphite raw materials. Furthermore, as the crushing plate 35 rotates, the crushed particles remain in motion. When the surface of the crushing plate 35 contacts the surfaces of the upper screen 32 and the lower screen 33, the crushed particles are confined to the gap between the crushing blocks 351 and are in the contact gap between the upper screen 32 and the lower screen 33. The crushed particles maintain rolling friction and impact on the contact surface in the gap area, further improving the cleaning effect on the graphite raw materials adhering to the upper screen 32 and the lower screen 33. Furthermore, the pulverized particles, while in motion, move on the upper surface of the lower screen 33. The rolling friction causes the graphite raw material adhering to the upper surface to vibrate and separate, ensuring the passability of the lower screen 33. On the other hand, the pulverized particles can jump upwards during their movement, impacting and cleaning the graphite raw material adhering to the mesh of the upper screen 32, as well as the graphite agglomerates located on the upper side of the upper screen 32. This allows the graphite raw material to be fully decomposed and refined under the impact, further improving the yield of graphite raw material and ensuring the passability of the entire screening layer 31.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pulverizing device for preparing high-expandable graphite, comprising a roller pulverizing device, the roller pulverizing device comprising a body (1), a feed inlet (11) at the top of the body (1) and a discharge outlet (12) at the bottom, wherein pulverizing rollers (14) are symmetrically arranged in a pulverizing chamber (13) inside the body (1), and the ends of the pulverizing rollers (14) are connected to a drive motor on the outside of the body (1), characterized in that: A fixing frame (2) is provided inside the crushing chamber (13) in the gap area between the crushing roller (14) and the inner wall of the crushing chamber (13). A cleaning roller (21) is rotatably mounted on the fixing frame (2). The fixing frame (2) is connected to the output end of the telescopic device provided inside the crushing chamber (13). A pull-out box (3) is provided on the upper side of the discharge port (12). The pull-out box (3) is slidably connected to the inner wall of the discharge port (12) at the bottom of the crushing chamber (13). A screening layer (31) is provided inside the pull-out box (3). The screening layer (31) is a mesh structure used to separate graphite raw materials whose size does not meet the requirements. The cleaning roller (21) is uniformly provided with cleaning scrapers (22), and the sharp part of the curved end of the cleaning scraper (22) is in contact with the surface of the cleaning roller (21).

2. The pulverizing device for preparing high-ratio expandable graphite according to claim 1, characterized in that: The end of the cleaning scraper (22) is made of hard material, while the part of the cleaning scraper (22) near the cleaning roller (21) is made of elastic material, and the surface of the crushing roller (14) is made of smooth metal material.

3. The pulverizing device for preparing high-ratio expandable graphite according to claim 2, characterized in that: The cleaning roller (21) is hollow inside, and a limiting ring (23) is provided in the center of the hollow area. The limiting ring (23) divides the hollow area inside the cleaning roller (21) into an inflation area (211) surrounded by the limiting ring (23) and an air extraction area (212) outside the limiting ring (23). An air pump device is provided on the limiting ring (23). The air inlet end of the air pump device is connected to the air extraction area (212), and the air outlet end is connected to the inflation area (211). The air extraction area (212) is connected to the outside. The cleaning scraper (22) has an impact hole (221) on its conical end. The impact hole (221) communicates with an air chamber (222) inside the end area of ​​the cleaning scraper (22). The air chamber (222) communicates with the air-filled area (211) through an air-filled pipe (231).

4. The pulverizing device for preparing high-ratio expandable graphite according to claim 3, characterized in that: The surface of the curved part of the cleaning scraper (22) near the cleaning roller (21) is uniformly provided with suction holes (223), and the suction holes (223) are connected to the interior of the air extraction zone (212).

5. The pulverizing device for preparing high-ratio expandable graphite according to claim 4, characterized in that: A layer of intercepting net (224) is provided on the surface of the cleaning scraper (22) outside the suction hole (223). One side of the intercepting net (224) is connected to the end of the cleaning scraper (22), and the other end is connected to the joint between the cleaning scraper (22) and the cleaning roller (21). The intercepting net (224) is made of elastic material.

6. The pulverizing device for preparing high-ratio expandable graphite according to claim 5, characterized in that: The pull-out box (3) is a square frame structure, and the screening layer (31) on the inner wall of the pull-out box (3) is a double-layer structure, consisting of an upper screening mesh (32) and a lower screening mesh (33); the aperture of the upper screening mesh (32) is larger than that of the lower screening mesh (33), and the gap area between the upper screening mesh (32) and the lower screening mesh (33) is a crushing zone (34). Crushing plates (35) are uniformly arranged inside the crushing zone (34), and the end of the crushing plate (35) is connected to the output end of the rotating device provided on the inner wall of the pull-out box (3).

7. The pulverizing device for preparing high-ratio expandable graphite according to claim 6, characterized in that: The crushing plate (35) has an elliptical cross-section, and the length of the major axis of the ellipse is greater than the distance between the upper screen (32) and the lower screen (33), while the length of the minor axis of the ellipse is less than the distance between the upper screen (32) and the lower screen (33); the surface of the crushing plate (35) is smoothed.

8. The pulverizing device for preparing high-ratio expandable graphite according to claim 7, characterized in that: The crushing zone (34) is filled with elastic crushing particles, which are spherical and have a particle size larger than the aperture of the lower screen (33) and smaller than the aperture of the upper screen (32).

9. A pulverizing device for preparing high-ratio expandable graphite according to claim 8, characterized in that: The outer surface of the crushing plate (35) is uniformly provided with crushing blocks (351), and the surface of the crushing blocks (351) is arc-shaped.

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