Screening device for preparing high-purity graphite

Abstract

The invention relates to the technical field of screening structures, in particular to a screening device for preparing high-purity graphite, which comprises an outer barrel and a screening drum positioned on the inner side of the outer barrel, the screening drum rotates in the outer barrel, an air inlet pipeline is arranged between the outer barrel and the screening drum, and the air inlet pipeline is in sliding contact with the outer wall of the screening drum; the mode that graphite is screened in space is adopted, the area of a screening area can be increased, compared with a traditional screen type plane screening mode, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided; due to the fact that the graphite is dispersed through the airflow, the graphite can penetrate through the screen drum at any position in space, and when the airflow carries the graphite to penetrate through the screen drum, the airflow can guide the graphite, so that the liquidity of the graphite is improved, and the situation that a large amount of graphite is accumulated at the positions of the screen holes and blocks the screen holes is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of screening structures, and particularly to a screening device for the preparation of high-purity graphite. Background Art

[0002] As a key basic material, high-purity graphite plays an irreplaceable role in high-tech fields such as semiconductors, lithium-ion batteries, nuclear energy, and aerospace. Its excellent electrical conductivity, thermal stability, chemical inertness, and mechanical strength directly depend on the purity level of the raw materials, usually requiring a carbon content of over 99.99%. With the rapid development of the new energy industry and the miniaturization trend of precision electronic devices, the market has put forward more stringent standards for the particle size uniformity and impurity control level of high-purity graphite. Under this background, the pretreatment link of graphite raw materials, especially the screening process, has become an important node restricting the improvement of product performance.

[0003] In the graphite preparation process, natural graphite or artificial graphite raw materials need to go through multiple stages of crushing and purification before entering the screening process to separate particles that meet the particle size requirements. However, the traditional screening method mainly places the graphite on the screen and uses the vibration of the screen to achieve the screening of graphite. However, this method only presents the screening work completed by the planar screen, that is, the graphite needs to move downward and pass through the screen, and in other directions in space, the screening of graphite cannot be completed, and the graphite is prone to accumulation and affects its flow rate, thus affecting the screening efficiency. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a screening device for the preparation of high-purity graphite, and the specific technical solution adopted is as follows: A screening device for the preparation of high-purity graphite according to the present invention includes an outer barrel and a screening barrel located inside the outer barrel. The screening barrel rotates inside the outer barrel. An air inlet pipe is provided between the outer barrel and the screening barrel. The air inlet pipe is in sliding contact with the outer wall of the screening barrel, and the air inlet pipe is used to discharge air into the screening barrel. A negative pressure suction pipe for evacuating the air inside the outer barrel is connected and provided at the top of the outer barrel; Wherein, a feeding unit is arranged inside the screening barrel.

[0005] Optimized on the basis of the above implementation, the feeding unit includes a material pipe installed inside the outer barrel and passing through the screening barrel. A long material-dispersing opening is formed at the bottom of the material pipe along its own length direction. A rotating column is rotatably arranged inside the material pipe, and a spiral material-uniforming plate for pushing the graphite to move axially along the material pipe is arranged on the rotating column; Wherein, the outer barrel and the screening barrel are horizontally arranged coaxially.

[0006] Optimized based on the above implementation, a partition is provided inside the sieve cylinder. A threaded rod is inserted through the partition, and the threaded rod is threadedly connected to the partition. The threaded rod is used to push the partition to reciprocate axially along the sieve cylinder; Wherein, discharge structures are provided at both ends of the outer barrel, and the material pipe passes through the partition and slides relative to it.

[0007] Optimized based on the above implementation, a shielding plate for blocking a part of the long opening of the bulk material is provided on the partition. The shielding plate is slidably arranged on the partition along the axial direction of the outer barrel.

[0008] Optimized based on the above implementation, a fixing cavity corresponding to the shielding plate is formed inside the partition. A helical gear is rotatably arranged in the fixing cavity. Helical teeth for meshing with the helical gear are provided on the outer wall of the shielding plate. The helical gear is connected to the inner wall of the fixing cavity through a torsion spring.

[0009] Optimized based on the above implementation, a cleaning unit for cleaning the threaded rod is provided on the material pipe; The cleaning unit includes a secondary pipeline arranged parallel to the material pipe and a guiding pipeline installed on the side of the secondary pipeline. An air guiding chamber is formed inside the secondary pipeline. An arc-shaped channel, an isolation air passage and a discharge port are formed inside the guiding pipeline. The air guiding chamber, the arc-shaped channel, the isolation air passage and the discharge port are interconnected; Wherein, the output end of the arc-shaped channel is inclined towards the threaded rod. The discharge port is located below the isolation air passage. The graphite entering the arc-shaped channel is allowed to naturally pass through the discharge port and be discharged. The isolation air passage is used to guide the air flow in the air guiding chamber into the arc-shaped channel.

[0010] Optimized based on the above implementation, the discharge structure includes a discharge channel and a rod body. The discharge channel is obliquely installed at the end of the outer barrel, and the discharge channel is communicated with the inside of the sieve cylinder. One end of the rod body is slidably inserted into the discharge channel, and a sealing plate for blocking the discharge channel is provided at the end of the rod body inside the discharge channel. The other end of the rod body abuts against the outer wall of the discharge channel. The rod body and the discharge channel are connected through a spring; Wherein, top columns for cooperating with each sealing plate are provided on both end faces of the partition.

[0011] Optimized based on the above implementation, three transmission wheels, a transmission belt drivingly installed on the three transmission wheels, and a main motor for providing power to one of the transmission wheels are provided at the end of the outer barrel. The remaining two transmission wheels are respectively drivingly connected to the rotating column and the threaded rod; An air inlet pipe for supplying air into the air guide chamber and a feed pipe for introducing graphite into the material pipe are further provided on the outer barrel.

[0012] The beneficial effects of the present invention are as follows: By adopting the method of screening graphite in space, the area of the screening region can be increased. Compared with the traditional planar screening method using a sieve mesh, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided; since the air flow is used to disperse the graphite, the graphite can pass through the sieve cylinder at any position in space. When the air flow carries the graphite through the sieve cylinder, the air flow will guide the graphite, thereby improving the fluidity of the graphite, avoiding a large amount of graphite from accumulating at the sieve holes and causing blockage of the sieve holes. At the same time, the air flow can be used to preliminarily screen the graphite prior to the sieve cylinder, avoiding the mixing of large-particle graphite and small-particle graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic diagram of the internal structure of the buckle cover in the embodiment of the present invention; Figure 3 is a schematic cross-sectional structure diagram of the outer barrel and the sieve cylinder in the embodiment of the present invention; Figure 4 is Figure 3 a schematic structural diagram from another perspective; Figure 5 is Figure 4 a partially enlarged structural diagram at position A in; Figure 6 is a schematic cross-sectional structure diagram of a sub-pipeline in the embodiment of the present invention; Figure 7 is a schematic cross-sectional structure diagram of a discharge channel in the embodiment of the present invention.

[0015] Reference numerals: 1. Outer barrel; 2. Sieve cylinder; 3. Intake pipe; 4. Negative pressure suction pipe; 5. Material pipe; 6. Bulk material long opening; 7. Rotating column; 8. Spiral material leveling plate; 9. Partition board; 10. Threaded rod; 11. Shading board; 12. Fixed cavity; 13. Helical gear; 14. Torsion spring; 15. Auxiliary pipe; 16. Guide pipe; 17. Air guide chamber; 18. Arc-shaped channel; 19. Isolation air duct; 20. Discharge port; 21. Discharge channel; 22. Rod body; 23. Sealing plate; 24. Spring; 25. Driving wheel; 26. Transmission belt; 27. Main motor; 28. Inlet pipe; 29. Feed pipe; 30. Buckle cover; 31. Top column. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. This embodiment is written in a progressive manner.

[0019] As Figures 1 to 7 shown, a screening device for preparing high-purity graphite according to the present invention includes an outer barrel 1 and a sieve cylinder 2 located inside the outer barrel 1. The sieve cylinder 2 rotates inside the outer barrel 1. An intake pipe 3 is arranged between the outer barrel 1 and the outer wall of the sieve cylinder 2. The intake pipe 3 is in sliding contact with the outer wall of the sieve cylinder 2 and is used to discharge air into the sieve cylinder 2. A negative pressure suction pipe 4 for evacuating the air inside the outer barrel 1 is connected to the top of the outer barrel 1; Among them, a feeding unit is arranged inside the sieve cylinder 2; In the present invention, the outer barrel 1 and the sieve barrel 2 can be arranged in a vertical state or a horizontal state. When the vertical arrangement is adopted, the graphite can fall downward from the upper side inside the sieve barrel 2. At this time, the rotational arrangement of the sieve barrel 2 serves to provide centrifugal force for the graphite. When the outer barrel 1 and the sieve barrel 2 are arranged horizontally, the graphite can be introduced into the sieve barrel 2 from the middle or end of the sieve barrel 2. At this time, the rotational movement of the sieve barrel 2 can keep the graphite in a moving state in the vertical direction, thus avoiding static accumulation of the graphite. The air inlet pipe 3 is used to introduce air into the sieve barrel 2 to make the air blow the graphite to fly and disperse in the sieve barrel 2. The negative pressure suction pipe 4 is used to evacuate the air inside the outer barrel 1, so that the graphite passing through the sieve barrel 2 is discharged through the negative pressure suction pipe 4 following the air flow. During actual use, to improve the blowing effect of the air flow discharged from the air inlet pipe 3 on the graphite, the air inlet pipe 3 can be arranged at the bottom of the sieve barrel 2 to make the air flow blow upward, and it is convenient to disperse the graphite accumulated on the lower side inside the sieve barrel 2, making the effect of the air flow more direct. Since the air inlet pipe 3 is located between the outer barrel 1 and the sieve barrel 2, and the air inlet pipe 3 discharges air into the sieve barrel 2, while the graphite moves from the inside of the sieve barrel 2 to the inside of the outer barrel 1 during sieving, the air discharged from the air inlet pipe 3 can clean the sieve barrel 2 in the reverse direction to avoid blockage of the sieve barrel 2 by graphite particles. At this time, the air inlet pipe 3 not only achieves the effect of blowing the graphite, but also achieves the effect of reverse cleaning of the sieve barrel 2. The path for the air inlet pipe 3 to discharge air into the sieve barrel 2 is strip-shaped and along the axial direction of the sieve barrel 2, so that it can effectively blow the graphite on the lower side inside the sieve barrel 2. When sieving the graphite, the sieve barrel 2 is in a rotating state, and the air inlet pipe 3 continuously introduces air into the sieve barrel 2. The air in the sieve barrel 2 will pass through the sieve barrel 2 and enter the outer barrel 1 in the reverse direction, and the air in the outer barrel 1 is evacuated through the negative pressure suction pipe 4. The graphite is introduced into the sieve barrel 2 through the feeding unit. Due to the blowing effect of the air flow discharged from the air inlet pipe 3, the graphite randomly flies and disperses in the sieve barrel 2, and the graphite follows the air flow through the sieve barrel 2 and enters the outer barrel 1. At this time, the sieve barrel 2 screens the graphite. And because the graphite can pass through the sieve barrel 2 from any position in space, the screening of the graphite in space can be realized. Since the air flow blows the graphite to fly, the graphite can be fully dispersed, avoiding interference between them and avoiding the accumulation of the graphite, so that the graphite can quickly pass through the sieve barrel 2, improving the screening efficiency. Since the sieve barrel 2 is in a rotating state, any position on the sieve barrel 2 can be cleaned in the reverse direction by the air discharged from the air inlet pipe 3, thus ensuring that the sieve barrel 2 has high fluidity. And the rotation of the sieve barrel 2 can drive the graphite located on the lower side inside the sieve barrel 2 to move. When the graphite moves to a higher position, it slides downward along the inner wall of the sieve barrel 2 due to gravity, so that the graphite is in a moving state and avoids its accumulation. Since the air flow is used to carry the graphite for sieving, continuous sieving of the graphite can be realized with the continuous transportation of the air flow. By adopting a method of spatially screening graphite, the area of the screening region can be increased. Compared with the traditional flat screening method using a sieve mesh, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided; since air flow is used to disperse graphite, graphite can pass through the sieve cylinder 2 at any position in space, and when the air flow carries graphite through the sieve cylinder 2, the air flow will guide the graphite, thereby improving the fluidity of graphite, avoiding a large amount of graphite from accumulating at the sieve holes and causing blockage of the sieve holes. At the same time, the air flow can be used to preliminarily screen graphite prior to the sieve cylinder 2, avoiding the mixing of large-particle graphite and small-particle graphite.

[0020] Furthermore, the feeding unit includes a material pipe 5 installed in the outer barrel 1 and passing through the sieve cylinder 2. A long material-dispersing opening 6 is formed at the bottom of the material pipe 5 along its length direction. A rotating column 7 is rotatably arranged in the material pipe 5, and a spiral material-uniforming plate 8 for pushing graphite to move axially along the material pipe 5 is arranged on the rotating column 7; Among them, the outer barrel 1 and the sieve cylinder 2 are horizontally arranged coaxially; In the present invention, graphite is introduced into the material pipe 5 from one end of the material pipe 5. The rotating column 7 and the spiral material-uniforming plate 8 can rotate and push graphite to move axially along the material pipe 5. During this process, the graphite will be discharged into the sieve cylinder 2 through the long material-dispersing opening 6, thereby enabling the graphite to be diffused downward in a shape inside the sieve cylinder 2, facilitating the dispersion of graphite and facilitating its counterflow with the air flow discharged from the air inlet pipe 3, so that the graphite can be dispersed following the air flow in the sieve cylinder 2, improving the graphite dispersion effect.

[0021] Furthermore, a partition plate 9 is arranged in the sieve cylinder 2. A threaded rod 10 is inserted through the partition plate 9, and the threaded rod 10 is threadedly connected to the partition plate 9. The threaded rod 10 is used to push the partition plate 9 to reciprocate axially along the sieve cylinder 2; Among them, discharge structures are arranged at both ends of the outer barrel 1, and the material pipe 5 passes through the partition plate 9 and slides relatively; During the process of graphite screening, the large-particle graphite intercepted by the sieve cylinder 2 will continuously accumulate on the lower side inside the sieve cylinder 2. To clean the intercepted large-particle graphite, the structure of the partition plate 9 and the threaded rod 10 can be utilized. The threaded rod 10 can push the partition plate 9 to move in the sieve cylinder 2, so that the partition plate 9 pushes the intercepted large-particle graphite to move left or right, thereby pushing it to the corresponding discharge structure position, thus realizing the continuous progress of the screening work; when the partition plate 9 moves, it can slide on the material pipe 5, thereby using the material pipe 5 to play a guiding role for the partition plate 9.

[0022] Furthermore, a shielding plate 11 for blocking a part of the long material-dispersing opening 6 is arranged on the partition plate 9, and the shielding plate 11 is slidably arranged on the partition plate 9 along the axial direction of the outer barrel 1; The partition plate 9 inside the sieve cylinder 2 divides the internal space of the sieve cylinder 2 into two chambers on the left and right. The two chambers will simultaneously screen the graphite, and as the partition plate 9 moves, the sizes of the two chambers continue to change. When the partition plate 9 moves to the left, it drives the baffle 11 to move synchronously, and the blocking position of the baffle 11 on the bulk material long opening 6 continuously changes. When the baffle 11 moves to the left side inside the sieve cylinder 2, the baffle 11 abuts against the inner wall of the outer barrel 1. At this time, a part of the bulk material long opening 6 corresponding to the chamber on the left side of the partition plate 9 is blocked, and the graphite cannot enter the chamber on the left side of the partition plate 9. As the partition plate 9 continues to move, the position of the baffle 11 remains stationary, and the baffle 11 moves relative to the partition plate 9. The partition plate 9 can discharge the large-particle graphite it pushes through the left discharge structure, thereby preventing the graphite discharged from the bulk material long opening 6 from directly passing through the discharge structure and realizing the separate discharging work of the large-particle graphite. When the partition plate 9 moves to the left, the space on the right side of the partition plate 9 decreases, and the baffle 11 gradually returns to its initial position on the partition plate 9 and moves with the partition plate 9. When the right end of the baffle 11 moves to the right side inside the sieve cylinder 2, a part of the bulk material long opening 6 corresponding to the chamber on the right side of the partition plate 9 is blocked, and the right chamber is in a separate discharging working state. It should be noted that when the partition plate 9 moves in the middle area inside the sieve cylinder 2, a part of the bulk material long opening 6 corresponding to both the left and right sides of the partition plate 9 is in an open state, and the graphite can be directly introduced into the two chambers on the left and right.

[0023] Furthermore, a fixed cavity 12 corresponding to the baffle 11 is formed inside the partition plate 9. An inclined gear 13 is rotatably arranged inside the fixed cavity 12. An inclined tooth for meshing with the inclined gear 13 is arranged on the outer wall of the baffle 11. The inclined gear 13 is connected to the inner wall of the fixed cavity 12 through a torsion spring 14. Since the baffle 11 can slide on the partition plate 9 and the baffle 11 needs to automatically return to its initial position on the partition plate 9, a corresponding reset structure needs to be provided for the baffle 11. As above, when the baffle 11 moves relative to the partition plate 9, it uses the inclined tooth to push the inclined gear 13 to rotate, and the inclined gear 13 drives the torsion spring 14 to undergo elastic deformation. When the baffle 11 resets on the partition plate 9, the torsion spring 14 pushes the inclined gear 13 to rotate in the reverse direction and uses the inclined gear 13 to make the baffle 11 reset and move. It should be noted that the setting of the above structural method will not interfere with the moving range of the partition plate 9, so that when the partition plate 9 pushes the large-particle graphite to move, its side wall can abut against the inner wall of the outer barrel 1.

[0024] Furthermore, a cleaning unit for cleaning the threaded rod 10 is arranged on the material pipe 5. The cleaning unit includes a secondary pipeline 15 arranged in parallel with the material pipe 5 and a guiding pipeline 16 installed on the side of the secondary pipeline 15. An air guiding chamber 17 is formed in the secondary pipeline 15. An arc-shaped channel 18, an isolation air passage 19, and a discharging port 20 are formed in the guiding pipeline 16. The air guiding chamber 17, the arc-shaped channel 18, the isolation air passage 19, and the discharging port 20 are interconnected; Among them, the output end of the arc-shaped channel 18 is inclined towards the threaded rod 10. The discharging port 20 is located below the isolation air passage 19. The graphite entering the arc-shaped channel 18 is allowed to naturally drain through the discharging port 20. The isolation air passage 19 is used to guide the air flow in the air guiding chamber 17 into the arc-shaped channel 18; In the present invention, as Figure 6 shown, the trajectory of the arc-shaped channel 18 is arc-shaped, and its inner diameter width gradually increases from top to bottom. In this way, the graphite entering the arc-shaped channel 18 can move downward along its arc-shaped trajectory and be directly discharged through the discharging port 20. The isolation air passage 19 is higher than the discharging port 20, and the end of the isolation air passage 19 away from the air guiding chamber 17 is hidden on the upper right side of the connection position between the arc-shaped channel 18 and the discharging port 20. In this way, the graphite moving inertially in the arc-shaped channel 18 cannot enter the isolation air passage 19, thereby realizing the isolation of graphite. Moreover, the setting of the isolation air passage 19 can directly discharge the air in the air guiding chamber 17 towards the arc-shaped inner wall direction of the arc-shaped channel 18, making the air flow along the arc-shaped direction of the arc-shaped channel 18 towards its opening position. Thus, the two-way guiding of graphite particles and air is realized in the arc-shaped channel 18; The air flow discharged from the opening of the arc-shaped channel 18 can be blown onto the rotating threaded rod 10, thereby cleaning the graphite deposited on the threaded rod 10 and preventing it from entering the threaded connection position between the threaded rod 10 and the partition plate 9 in large quantities and causing blockage.

[0025] Furthermore, the discharging structure includes a discharging channel 21 and a rod body 22. The discharging channel 21 is inclined and installed at the end of the outer barrel 1, and the discharging channel 21 is internally connected to the inside of the sieve cylinder 2. One end of the rod body 22 is slidably inserted into the discharging channel 21, and a sealing plate 23 for blocking the discharging channel 21 is arranged at the end of the rod body 22 in the discharging channel 21. The other end of the rod body 22 abuts against the outer wall of the discharging channel 21. The rod body 22 and the discharging channel 21 are connected by a spring 24; Among them, top columns 31 for cooperating with the respective sealing plates 23 are arranged on both end faces of the partition plate 9; The inclined setting of the discharge channel 21 can make the large-particle graphite fall naturally when leaving the screen drum 2 and entering the discharge channel 21. The sealing plate 23 can use the rod body 22 and the spring 24 to push and block the discharge channel 21, thereby preventing the air inside the screen drum 2 and the unscreened graphite from being discharged through the discharge channel 21; the shape of the rod body 22 is an arch with unequal lengths at both ends, one end of which is in contact with the sealing plate 23, and the other end is used to limit the position of the sealing plate 23; in some embodiments, the position of the sealing plate 23 can also be set as follows Figure 7 The inclined surface position inside the discharge channel 21 is shown, and the position of the sealing plate 23 is limited by the inclined inner wall of the discharge channel 21; When discharging, the partition 9 moves to a position close to the discharge channel 21, and the shield plate 11 on the corresponding side of the partition 9 blocks part of the long opening 6 of the bulk material. The partition 9 uses its upper top column 31 to push the sealing plate 23 to move and open, and then the partition 9 continues to move and pushes the large particles of graphite into the discharge channel 21, thereby realizing the discharge work.

[0026] Furthermore, the end of the outer barrel 1 is provided with three transmission wheels 25, a transmission belt 26 installed on the three transmission wheels 25, and a main motor 27 for providing power to one transmission wheel 25, and the remaining two transmission wheels 25 are respectively connected to the rotating column 7 and the threaded rod 10; The outer barrel 1 is also provided with an air inlet pipe 28 for supplying air to the air guide chamber 17 and a feed pipe 29 for introducing graphite into the feed pipe 5; In the present invention, the main motor 27 can use three transmission wheels 25 and a transmission belt 26 to provide power for the rotating column 7 and the threaded rod 10, so that the spiral material leveling plate 8 and the threaded rod 10 are in motion; the rotation of the screen drum 2 can be powered by an external drive motor; the air inlet pipe 28 can provide air to the inside of the air guide chamber 17; the feed pipe 29 can continuously introduce screened graphite into the inside of the material pipe 5.

[0027] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A screening device for preparing high-purity graphite, characterized in that It includes an outer barrel and a sieve barrel located inside the outer barrel. The sieve barrel rotates inside the outer barrel. An air inlet pipe is arranged between the outer barrel and the sieve barrel. The air inlet pipe is in sliding contact with the outer wall of the sieve barrel, and the air inlet pipe is used to discharge air into the sieve barrel. A negative pressure suction pipe for pumping out the air inside the outer barrel is communicated and arranged at the top of the outer barrel; Among them, a feeding unit is arranged inside the sieve barrel.

2. The screening device for preparing high-purity graphite according to claim 1, characterized in that, The feeding unit includes a material pipe installed inside the outer barrel and passing through the sieve barrel. A long material-dispersing opening is formed at the bottom of the material pipe along its own length direction. A rotating column is rotatably arranged inside the material pipe, and a spiral material-uniforming plate for pushing graphite to move axially along the material pipe is arranged on the rotating column; Among them, the outer barrel and the sieve barrel are horizontally arranged coaxially.

3. The screening device for preparing high-purity graphite according to claim 2, characterized in that, A partition plate is arranged inside the sieve barrel. A threaded rod is inserted through the partition plate, and the threaded rod is in threaded connection with the partition plate. The threaded rod is used to push the partition plate to reciprocate axially along the sieve barrel; Among them, discharge structures are arranged at both ends of the outer barrel, and the material pipe passes through the partition plate and slides relatively.

4. The screening device for preparing high-purity graphite according to claim 3, characterized in that, A shielding plate for blocking part of the long material-dispersing opening is arranged on the partition plate. The shielding plate is slidably arranged on the partition plate along the axial direction of the outer barrel.

5. A screening device for preparing high-purity graphite according to claim 4, characterized in that, A fixing cavity corresponding to the shielding plate is formed inside the partition plate. A bevel gear is rotatably arranged inside the fixing cavity. A bevel tooth meshing with the bevel gear is arranged on the outer wall of the shielding plate. The bevel gear is connected to the inner wall of the fixing cavity through a torsion spring.

6. The screening device for preparing high-purity graphite according to claim 5, characterized in that, A cleaning unit for cleaning the threaded rod is arranged on the material pipe; The cleaning unit includes an auxiliary pipe arranged parallel to the material pipe and a guiding pipe installed on the side of the auxiliary pipe. An air guiding chamber is formed inside the auxiliary pipe. An arc-shaped channel, an isolation air channel and a discharge port are formed inside the guiding pipe. The air guiding chamber, the arc-shaped channel, the isolation air channel and the discharge port are communicated with each other; Among them, the output end of the arc-shaped channel is inclined towards the threaded rod. The discharge port is located below the isolation air channel. The graphite entering the arc-shaped channel is allowed to naturally drain away through the discharge port. The isolation air channel is used to guide the air flow inside the air guiding chamber into the arc-shaped channel.

7. The screening device for preparing high-purity graphite according to claim 6, wherein, The discharge structure includes a discharge channel and a rod body. The discharge channel is inclined and installed at the end of the outer barrel, and the discharge channel is communicated with the inside of the sieve barrel. One end of the rod body is slidably inserted into the discharge channel, and a sealing plate for blocking the discharge channel is arranged at the end of the rod body inside the discharge channel. The other end of the rod body abuts against the outer wall of the discharge channel. The rod body and the discharge channel are connected through a spring; Among them, a top column for cooperating with each sealing plate is arranged on both end faces of the partition plate.

8. A screening device for preparing high-purity graphite according to claim 7, characterized in that, Three transmission wheels, a transmission belt drivingly installed on the three transmission wheels, and a main motor for providing power for one of the transmission wheels are arranged at the end of the outer barrel. The remaining two transmission wheels are respectively drivingly connected to the rotating column and the threaded rod; An air inlet pipe for supplying air into the air guide chamber and a feed pipe for introducing graphite into the material pipe are further provided on the outer barrel.

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