A screening device for preparing high-purity graphite

Abstract

The present invention relates to the technical field of screening structures, and in particular to a screening device for preparing high-purity graphite, comprising an outer barrel and a sieve drum located inside the outer barrel, the sieve drum rotating inside the outer barrel, an air intake duct being provided between the outer barrel and the sieve drum, the air intake duct being in sliding contact with the outer wall of the sieve drum; by adopting a method of screening graphite in space, the area of ​​the screening region can be increased, and compared with the traditional screen-type planar screening method, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided; since the graphite is dispersed by air flow, the graphite can be made to pass through the sieve drum at any position in space, and when the air flow carries the graphite through the sieve drum, the air flow will guide the graphite, thereby improving the flowability of the graphite and avoiding a large amount of graphite accumulating at the sieve hole position and causing blockage of the sieve hole.

Description

Technical Field

[0001] The present invention relates to the technical field of screening structures, in particular to a screening device for preparing 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, aerospace, etc. Its excellent conductivity, thermal stability, chemical inertness and mechanical strength are directly dependent on the purity level of the raw materials, and the carbon content is usually required to reach more than 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. In this context, the pretreatment 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 undergo multi-stage 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 screen vibration to screen the graphite. This method only uses a flat screen to complete the screening work, that is, the graphite needs to move downward and pass through the screen. The screening work of the graphite cannot be completed in other directions in space. In addition, the graphite is easy to accumulate and affect its circulation speed, thereby affecting the screening efficiency. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a screening device for preparing high-purity graphite, the specific technical solution adopted by the present invention is:

[0005] A screening device for preparing high-purity graphite according to the present invention comprises an outer barrel and a sieve drum located inside the outer barrel, wherein the sieve drum rotates within the outer barrel, an air intake duct is provided between the outer barrel and the sieve drum, the air intake duct is in sliding contact with the outer wall of the sieve drum, and the air intake duct is used to discharge air into the sieve drum, and a negative pressure suction pipe for extracting air from the outer barrel is provided in communication with the top of the outer barrel;

[0006] Wherein, a feeding unit is provided in the screen cylinder.

[0007] Optimized in the above embodiment, the feeding unit includes a material pipe installed in the outer barrel and passing through the screen drum, the bottom of the material pipe is provided with a long opening for bulk material along its length direction, a rotating column is provided in the material pipe, and a spiral material plate is provided on the rotating column for pushing the graphite to move axially along the material pipe;

[0008] Wherein, the outer barrel and the screen drum are coaxially arranged horizontally.

[0009] Optimized in the above embodiment, a partition is provided in the screen drum, a threaded rod is inserted into the partition, and the threaded rod is threadedly connected to the partition, and the threaded rod is used to push the partition to reciprocate along the axial direction of the screen drum;

[0010] Wherein, both ends of the outer barrel are provided with a discharge structure, and the material pipe passes through the partition and slides relatively.

[0011] Optimized in the above implementation, the partition is provided with a shield plate for blocking part of the long opening of the bulk material, and the shield plate is slidably arranged on the partition plate along the axial direction of the outer barrel.

[0012] Optimized in the above implementation, a fixed cavity corresponding to the baffle is opened in the partition, a helical gear is rotatably arranged in the fixed cavity, and helical teeth for engaging with the helical gear are provided on the outer wall of the baffle, and the helical gear is connected to the inner wall of the fixed cavity by a torsion spring.

[0013] Optimizing the above embodiment, the material pipe is provided with a cleaning unit for cleaning the threaded rod;

[0014] The cleaning unit includes a secondary pipe arranged parallel to the material pipe and a guide pipe installed on the side of the secondary pipe, an air guide chamber is opened in the secondary pipe, an arc-shaped channel, an isolation air channel and a discharge port are opened in the guide pipe, and the air guide chamber, the arc-shaped channel, the isolation air channel and the discharge port are interconnected;

[0015] Among them, the output end of the arc channel is inclined toward the threaded rod, and the discharge port is located below the isolation air channel. The graphite entering the arc channel is allowed to be discharged naturally through the discharge port. The isolation air channel is used to guide the airflow in the air guide chamber into the arc channel.

[0016] Optimized in the above embodiment, 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 interior of the screen drum, one end of the rod body is slidably inserted into the discharge channel, and the end of the rod body in the discharge channel is provided with a sealing plate for blocking the discharge channel, the other end of the rod body abuts against the outer wall of the discharge channel, and the rod body and the discharge channel are connected by a spring;

[0017] Wherein, top columns for cooperating with the sealing plates are provided on both end surfaces of the partition.

[0018] Optimized in the above embodiment, the end of the outer barrel is provided with three transmission wheels and a transmission belt installed on the three transmission wheels, and a main motor for providing power to one of the transmission wheels, and the remaining two transmission wheels are respectively connected to the rotating column and the threaded rod;

[0019] The outer barrel is also provided with an air inlet pipe for supplying air to the interior of the air guide chamber and a feeding pipe for introducing graphite into the material pipe.

[0020] The beneficial effects of the present invention are:

[0021] By adopting a method of screening the graphite in space, the area of ​​the screening region can be increased. Compared with the traditional screen-type plane screening method, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided. Since the graphite is dispersed by air flow, the graphite can be made to pass through the screen cylinder at any position in space, and when the air flow carries the graphite through the screen cylinder, the air flow will guide the graphite, thereby improving the flowability of the graphite, avoiding a large amount of graphite accumulating at the screen hole position and clogging the screen hole. At the same time, the air flow can be used to preliminarily screen the graphite before the screen cylinder, avoiding the mixing of large and small particles of graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 is a schematic diagram of the internal structure of the buckle cover in an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the cross-sectional structure of the outer barrel and the screen drum in an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 Structural diagram from another perspective;

[0027] Figure 5 yes Figure 4 A schematic diagram of the partially enlarged structure at center A;

[0028] Figure 6 This is a schematic diagram of a partial cross-sectional structure of a secondary pipeline in an embodiment of the present invention;

[0029] Figure 7It is a schematic diagram of the cross-sectional structure of the discharge channel in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. Outer barrel; 2. Screen drum; 3. Air inlet pipe; 4. Negative pressure suction pipe; 5. Material pipe; 6. Long opening for bulk material; 7. Rotating column; 8. Spiral material leveling plate; 9. Partition; 10. Threaded rod; 11. Shield; 12. Fixed chamber; 13. Bevel gear; 14. Torsion spring; 15. Auxiliary pipe; 16. Guide pipe; 17. Air guide chamber; 18. Arc channel; 19. Isolation air duct; 20. Discharge port; 21. Unloading channel; 22. Rod body; 23. Closing plate; 24. Spring; 25. Drive wheel; 26. Drive belt; 27. Main motor; 28. Air inlet pipe; 29. ​​Feed pipe; 30. Buckle cover; 31. Top column. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0035] like Figures 1 to 7 As shown, a screening device for preparing high-purity graphite of the present invention comprises an outer barrel 1 and a sieve drum 2 located inside the outer barrel 1. The sieve drum 2 rotates in the outer barrel 1. An air intake pipe 3 is provided between the outer barrel 1 and the sieve drum 2. The air intake pipe 3 is in sliding contact with the outer wall of the sieve drum 2 and is used to discharge air into the sieve drum 2. A negative pressure suction pipe 4 is provided at the top of the outer barrel 1 for extracting air from the outer barrel 1.

[0036] Among them, a feeding unit is provided in the screen drum 2;

[0037] In the present invention, the outer barrel 1 and the sieve drum 2 can be set in a vertical state or a horizontal state. When the vertical setting is adopted, the graphite can be scattered downward from the upper side of the inside of the sieve drum 2. At this time, the rotation setting of the sieve drum 2 plays a role in providing centrifugal force for the graphite. When the outer barrel 1 and the sieve drum 2 are set in a horizontal manner, the graphite can be introduced into the sieve drum 2 from the middle or end of the sieve drum 2. At this time, the rotation movement of the sieve drum 2 can make the graphite in a vertical direction in motion, thereby avoiding static accumulation of graphite. The air intake pipe 3 is used to introduce air into the sieve drum 2, so that the air blows the graphite to fly and disperse in the sieve drum 2. The negative pressure suction pipe 4 is used to extract the air inside the outer barrel 1, so that the graphite passing through the sieve drum 2 is discharged through the negative pressure suction pipe 4 along the air flow;

[0038] In actual use, in order to improve the blowing effect of the airflow discharged from the air intake pipe 3 on the graphite, the air intake pipe 3 can be set at the bottom of the sieve drum 2, so that the airflow blows upward, and it is convenient to blow away the graphite gathered on the lower side of the sieve drum 2, so that the effect of the airflow is more direct; since the air intake pipe 3 is located between the outer barrel 1 and the sieve drum 2, the air intake pipe 3 discharges air into the inside of the sieve drum 2, and the graphite moves from the inside of the sieve drum 2 to the inside of the outer barrel 1 during screening, so the air discharged from the air intake pipe 3 can clean the sieve drum 2 in the reverse direction, avoiding the sieve drum 2 from being blocked by graphite particles. At this time, the air intake pipe 3 achieves both the effect of blowing graphite and the effect of reverse cleaning the sieve drum 2; the path for the air discharged from the air intake pipe 3 into the sieve drum 2 is long and strip-shaped, and it is along the axial direction of the sieve drum 2, so that the graphite on the lower side of the inside of the sieve drum 2 can be effectively blown;

[0039] When the graphite is screened, the sieve drum 2 is in a rotating state, and the air inlet pipe 3 continuously introduces air into the sieve drum 2. The air in the sieve drum 2 passes through the sieve drum 2 and enters the outer barrel 1 in the reverse direction. The air in the outer barrel 1 is extracted through the negative pressure suction pipe 4. The graphite is introduced into the sieve drum 2 through the feeding unit. Due to the blowing effect of the airflow discharged from the air inlet pipe 3, the graphite flies and disperses freely in the sieve drum 2. The graphite follows the airflow through the sieve drum 2 and enters the outer barrel 1. At this time, the sieve drum 2 screens the graphite, and since the graphite can pass through the sieve drum 2 from any position in space, the graphite screening work in space can be realized. Since the airflow blows the graphite to fly, the graphite can be fully separated. Dispersion is achieved by avoiding mutual interference between them and graphite accumulation, so that the graphite can quickly pass through the screen drum 2, thereby improving the screening efficiency; since the screen drum 2 is in a rotating state, any position on the screen drum 2 can be reversely cleaned by the air discharged from the air intake pipe 3, thereby ensuring that the screen drum 2 has high fluidity, and the rotation of the screen drum 2 can drive the graphite located on the lower side of the screen drum 2 to move. When the graphite moves to a higher position, it slides down on the inner wall of the screen drum 2 due to gravity, thereby putting the graphite in a moving state and avoiding its accumulation; since the graphite is carried by airflow for screening, the continuous screening of the graphite can be achieved with the continuous transportation of the airflow;

[0040] By adopting a method of screening the graphite in space, the area of ​​the screening region can be increased. Compared with the traditional screen-type plane screening method, the screening area is larger, the screening efficiency is higher, and the phenomenon of graphite accumulation is avoided. Since the graphite is dispersed by air flow, the graphite can be made to pass through the screen cylinder 2 at any position in space, and when the air flow carries the graphite through the screen cylinder 2, the air flow will guide the graphite, thereby improving the flowability of the graphite, avoiding a large amount of graphite accumulating at the screen hole position and causing blockage of the screen hole. At the same time, the air flow can be used to preliminarily screen the graphite before the screen cylinder 2, avoiding the mixing of large and small particles of graphite.

[0041] Furthermore, the feeding unit includes a material pipe 5 installed in the outer barrel 1 and passing through the screen drum 2. The bottom of the material pipe 5 is provided with a long opening 6 for bulk material along its length. A rotating column 7 is provided in the material pipe 5 for rotation. The rotating column 7 is provided with a spiral material plate 8 for pushing the graphite to move axially along the material pipe 5.

[0042] The outer barrel 1 and the screen drum 2 are coaxially arranged horizontally;

[0043] In the present invention, graphite is introduced into the material pipe 5 from one end of the material pipe 5, and the rotating column 7 and the spiral material plate 8 can rotate and push the graphite to move axially along the material pipe 5. In this process, the graphite will be discharged into the sieve drum 2 through the bulk material long opening 6, thereby making the graphite diffuse downward in the sieve drum 2, which is convenient for dispersing the graphite and facilitating its collision with the airflow discharged from the air inlet pipe 3, so that the graphite can be dispersed in the sieve drum 2 following the airflow, thereby improving the graphite dispersion effect.

[0044] Furthermore, a partition plate 9 is provided in the screen drum 2, and a threaded rod 10 is inserted into the partition plate 9 and is threadedly connected to the partition plate 9. The threaded rod 10 is used to push the partition plate 9 to move back and forth along the axial direction of the screen drum 2;

[0045] Among them, both ends of the outer barrel 1 are provided with a discharge structure, and the material pipe 5 passes through the partition 9 and slides relatively;

[0046] During the graphite screening process, the large particles of graphite intercepted by the sieve drum 2 will continue to accumulate on the lower side of the inside of the sieve drum 2. In order to clean the intercepted large particles of graphite, the structure of the partition 9 and the threaded rod 10 can be used. The threaded rod 10 can push the partition 9 to move in the sieve drum 2, so that the partition 9 pushes the intercepted large particles of graphite to the left or right, thereby pushing it to the corresponding discharge structure position, thereby realizing the continuous screening work; when the partition 9 moves, it can slide on the material pipe 5, thereby using the material pipe 5 to guide the partition 9.

[0047] Furthermore, a shield 11 is provided on the partition 9 for blocking part of the bulk material long opening 6, and the shield 11 is slidably provided on the partition 9 along the axial direction of the outer barrel 1;

[0048] The partition 9 in the sieve drum 2 divides the internal space of the sieve drum 2 into two left and right chambers. The two chambers will screen the graphite at the same time, and as the partition 9 moves, the space size of the two chambers continues to change; when the partition 9 moves to the left, it will drive the baffle 11 to move synchronously, and the blocking position of the baffle 11 on the bulk material long opening 6 continues to change. When the baffle 11 moves to the left side of the sieve drum 2, the baffle 11 abuts against the inner wall of the outer barrel 1. At this time, the part of the bulk material long opening 6 corresponding to the chamber on the left side of the partition 9 is blocked, and graphite cannot enter the chamber on the left side of the partition 9. As the partition 9 continues to move, The shutter 11 is stationary and moves relative to the partition 9. The partition 9 can discharge the large-particle graphite pushed by it through the left discharge structure, thereby preventing the graphite discharged from the bulk material long opening 6 from being directly discharged through the discharge structure, and realizing the separate discharge of large-particle graphite; when the partition 9 moves to the left, the space on the right side of the partition 9 is reduced, and the shutter 11 gradually returns to its initial position on the partition 9 and moves with the partition 9. When the right end of the shutter 11 moves to the right side of the screen drum 2, the part of the bulk material long opening 6 corresponding to the right chamber of the partition 9 is blocked, and the right chamber is in a separate discharge working state;

[0049] It should be noted that when the partition 9 moves in the middle area inside the screen drum 2, the corresponding parts of the bulk material long openings 6 on the left and right sides of the partition 9 are in an open state, and graphite can be directly introduced into the left and right chambers.

[0050] Furthermore, a fixed cavity 12 corresponding to the shield 11 is opened in the partition 9, and a helical gear 13 is rotatably arranged in the fixed cavity 12. The outer wall of the shield 11 is provided with helical teeth for engaging with the helical gear 13. The helical gear 13 is connected to the inner wall of the fixed cavity 12 by a torsion spring 14.

[0051] Since the shutter 11 can slide on the partition 9 and needs to be able to automatically restore its initial position on the partition 9, a corresponding reset structure needs to be provided for the shutter 11. As described above, when the shutter 11 moves relative to the partition 9, its helical teeth will drive the helical gear 13 to rotate, and the helical gear 13 drives the torsion spring 14 to elastically deform. When the shutter 11 is reset on the partition 9, the torsion spring 14 drives the helical gear 13 to rotate in the opposite direction and uses the helical gear 13 to reset the shutter 11.

[0052] It should be noted that the above-mentioned structural arrangement will not interfere with the movement range of the partition 9, so that when the partition 9 pushes the large-particle graphite to move, its side wall can abut against the inner wall of the outer barrel 1.

[0053] Furthermore, the material tube 5 is provided with a cleaning unit for cleaning the threaded rod 10;

[0054] The cleaning unit includes a secondary pipe 15 arranged parallel to the material pipe 5 and a guide pipe 16 installed on the side of the secondary pipe 15. An air guide chamber 17 is defined in the secondary pipe 15, and an arc-shaped channel 18, an isolation air channel 19, and a discharge port 20 are defined in the guide pipe 16. The air guide chamber 17, the arc-shaped channel 18, the isolation air channel 19, and the discharge port 20 are interconnected.

[0055] The output end of the arc-shaped channel 18 is inclined toward the threaded rod 10, and the discharge port 20 is located below the isolation air channel 19. The graphite entering the arc-shaped channel 18 is allowed to be discharged naturally through the discharge port 20. The isolation air channel 19 is used to guide the airflow in the air guide chamber 17 into the arc-shaped channel 18.

[0056] In the present invention, Figure 6As shown, the trajectory of the arc-shaped channel 18 is arc-shaped, and its inner diameter width gradually increases from top to bottom, so that the graphite entering the arc-shaped channel 18 can move downward along its arc-shaped trajectory and be directly discharged through the discharge port 20; the isolation air channel 19 is higher than the discharge port 20, and the end of the isolation air channel 19 away from the air guide chamber 17 is hidden on the upper right side of the connection position between the arc-shaped channel 18 and the discharge port 20, so that the graphite moving by inertia in the arc-shaped channel 18 cannot enter the isolation air channel 19, thereby achieving the isolation of the graphite, and the setting of the isolation air channel 19 can make the air in the air guide chamber 17 be discharged directly toward the arc-shaped inner wall of the arc-shaped channel 18, so that the air flows along the arc direction of the arc-shaped channel 18 toward its opening position, thereby achieving two-way guidance of graphite particles and air in the arc-shaped channel 18;

[0057] The airflow 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 9 in large quantities and causing blockage.

[0058] Furthermore, the discharge structure includes a discharge channel 21 and a rod body 22. The discharge channel 21 is obliquely installed at the end of the outer barrel 1, and the discharge channel 21 is connected to the interior of the screen drum 2. One end of the rod body 22 is slidably inserted into the discharge channel 21, and a sealing plate 23 is provided at the end of the rod body 22 in the discharge channel 21 for blocking the discharge channel 21. The other end of the rod body 22 abuts against the outer wall of the discharge channel 21. The rod body 22 and the discharge channel 21 are connected by a spring 24.

[0059] Among them, both end surfaces of the partition 9 are provided with top columns 31 for use with each sealing plate 23;

[0060] The inclined setting of the discharge channel 21 can make the large particles of 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 contacts 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;

[0061] When discharging, the partition 9 moves to a position close to the discharge channel 21, and the shield 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.

[0062] 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. The remaining two transmission wheels 25 are respectively connected to the rotating column 7 and the threaded rod 10.

[0063] 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;

[0064] In the present invention, the main motor 27 can use three transmission wheels 25 and a transmission belt 26 to provide power to 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 intake 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.

[0065] 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: The invention comprises an outer barrel and a sieve drum located inside the outer barrel, wherein the sieve drum rotates in the outer barrel, an air intake duct is provided between the outer barrel and the sieve drum, the air intake duct is in sliding contact with the outer wall of the sieve drum, and the air intake duct is used to discharge air into the sieve drum, and a negative pressure suction pipe for extracting air from the outer barrel is provided at the top of the outer barrel; Wherein, a feeding unit is provided in the screen cylinder; The feeding unit includes a material pipe installed in the outer barrel and passing through the screen drum, a long opening for bulk material is opened at the bottom of the material pipe along its length direction, a rotating column is rotatably arranged in the material pipe, and a spiral material-distributing plate is provided on the rotating column for pushing the graphite to move axially along the material pipe; Wherein, the outer barrel and the screen drum are coaxially arranged horizontally; A partition is provided in the screen drum, a threaded rod is inserted into the partition, and the threaded rod is threadedly connected to the partition, and the threaded rod is used to push the partition to reciprocate along the axial direction of the screen drum; Wherein, both ends of the outer barrel are provided with a discharge structure, and the material pipe passes through the partition and slides relatively; The partition is provided with a shield plate for blocking a portion of the bulk material long opening, and the shield plate is slidably arranged on the partition plate along the axial direction of the outer barrel; A fixed cavity corresponding to the shield is formed in the partition, a helical gear is rotatably arranged in the fixed cavity, and helical teeth for engaging with the helical gear are provided on the outer wall of the shield, and the helical gear is connected to the inner wall of the fixed cavity via a torsion spring; The material pipe is provided with a cleaning unit for cleaning the threaded rod; The cleaning unit includes a secondary pipe arranged parallel to the material pipe and a guide pipe installed on the side of the secondary pipe, an air guide chamber is opened in the secondary pipe, an arc-shaped channel, an isolation air channel and a discharge port are opened in the guide pipe, and the air guide chamber, the arc-shaped channel, the isolation air channel and the discharge port are interconnected; Among them, the output end of the arc channel is inclined toward the threaded rod, and the discharge port is located below the isolation air channel. The graphite entering the arc channel is allowed to be discharged naturally through the discharge port. The isolation air channel is used to guide the airflow in the air guide chamber into the arc channel.

2. A screening device for preparing high-purity graphite according to claim 1, characterized in that: 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 interior of the screen drum, one end of the rod body is slidably inserted into the discharge channel, and the end of the rod body in the discharge channel is provided with a sealing plate for blocking the discharge channel, the other end of the rod body abuts against the outer wall of the discharge channel, and the rod body and the discharge channel are connected by a spring; Wherein, top columns for cooperating with the sealing plates are provided on both end surfaces of the partition.

3. A screening device for preparing high-purity graphite according to claim 2, characterized in that: The end of the outer barrel is provided with three transmission wheels and a transmission belt installed on the three transmission wheels, and a main motor for providing power to one of the transmission wheels, and the remaining two transmission wheels are respectively connected to the rotating column and the threaded rod; The outer barrel is also provided with an air inlet pipe for supplying air to the interior of the air guide chamber and a feeding pipe for introducing graphite into the material pipe.

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