Continuous graphitization and purification furnace and furnace cleaning device therefor

Abstract

A furnace cleaning device for a continuous graphitization and purification furnace, the furnace cleaning device comprising a graphite supporting plate and a sweeper which are arranged in a lower barrel, wherein the graphite supporting plate is connected to the lower bottom face of a bottomless crucible at the very bottom of a crucible group, and the sweeper is arranged in the bottomless crucible and is in transmission connection with a graphite transmission shaft; and the sweeper is driven by the graphite transmission shaft to rotate so as to scrape and sweep the inner wall of the bottomless crucible and the upper surface of the graphite supporting plate, such that materials fall out of a discharging hole, and scale adhering to the inner wall of the bottomless crucible and the upper surface of the graphite supporting plate is removed. Thus, scale in the furnace can be removed in time, non-production time such as for a furnace shutdown and furnace dismantling is shortened, the production efficiency is improved, and the energy consumption is reduced.

Description

A continuous graphitization and purification furnace and its cleaning device Technical Field

[0001] The present invention relates to the technical field of continuous graphitization and purification of carbon materials, in particular to a continuous graphitization and purification furnace and a furnace cleaning device for the continuous graphitization and purification furnace. Background Art

[0002] In traditional methods, the graphitization of negative electrode materials is generally carried out in Acheson graphitization furnaces and inner-string graphitization furnaces, and needs to go through the processes of feeding, graphitization treatment, cooling, and discharging. With the widespread application of lithium-ion batteries in electric vehicles and energy storage fields, the lithium battery industry continues to develop at a high speed, and higher requirements are placed on the graphitization of negative electrode materials. With the advancement of technology, continuous graphitization furnaces have emerged in recent years. For example, CN217330648U discloses a vertical continuous graphitization furnace for carbon materials. A crucible is provided in the vertical continuous graphitization furnace. After the raw materials enter the crucible and the graphitization reaction is completed in the crucible, the generated graphitized material is discharged from the crucible and discharged out of the furnace after cooling. The material undergoes a heating, high-temperature reaction, and cooling process in the continuous graphitization furnace.

[0003] Graphitization production involves high-temperature calcination of raw materials in an oxygen-free environment to form graphite, which also produces a small amount of sulfide. When the material leaves the high-temperature zone and enters the cooling zone, the sulfide forms solid scale that adheres to the inner surface of the graphite crucible. When this scale accumulates to a certain level, it can block the material discharge channel and reduce the effective volume of the crucible. In severe cases, it can cause localized overheating at the bottom of the crucible, leading to furnace shutdowns and other accidents, necessitating downtime for treatment. In such cases, the typical treatment is to stop feeding and cool the material. After the material cools, the furnace is dismantled and the scale in the continuous graphitization and purification furnace is manually cleaned. Once this is done, the furnace can resume production. This wastes significant labor and electricity, impacting production. Summary of the Invention

[0004] The present invention aims to address at least one of the deficiencies in the prior art. To this end, the present invention addresses the technical problem of providing a continuous graphitization and purification furnace and a furnace cleaning device for a vertical continuous graphitization and purification furnace, which can promptly remove sulfide scale adhering to the continuous graphitization and purification furnace, thereby achieving the goal of removing sulfide scale without stopping or dismantling the furnace during continuous graphitization production.

[0005] In order to solve the above technical problems, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the continuous graphitization and purification furnace includes a vertical furnace body, a crucible group, a driving mechanism arranged at the bottom end of the vertical furnace body, and a graphite transmission shaft connected to the driving mechanism, wherein the axis of the crucible group is provided with a central hole for the graphite transmission shaft to pass through, and the graphite transmission shaft passes through the crucible group in the axial direction through the central hole; the furnace cleaning device includes:

[0006] A lower cylinder with a hollow interior, the lower cylinder being fixed to the bottom of the continuous graphitization and purification furnace;

[0007] A graphite support plate is provided in the lower cylinder, the graphite support plate is connected to the lower bottom surface of the bottomless crucible at the bottom of the crucible group, and the graphite support plate is provided with a central hole for the graphite transmission shaft to pass through and a discharge hole for the material to fall;

[0008] A material collecting bin connected to the lower opening of the lower cylinder and in communication with the discharge port of the graphite support plate;

[0009] A sweeper is disposed in the bottomless crucible and is in driving connection with the graphite drive shaft. The sweeper is driven by the graphite drive shaft to rotate to scrape the inner wall of the bottomless crucible and the upper surface of the graphite support plate, so that the material falls out of the discharge hole, and the scale adhering to the inner wall of the bottomless crucible and the upper surface of the graphite support plate is removed.

[0010] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the cleaner has a suspension transmission-connected to the graphite drive shaft, and a plurality of strip comb teeth connected to the lower bottom surface of the suspension, wherein the axes of the strip comb teeth are arranged obliquely and intersecting with the axis of the suspension, and the strip comb teeth scrape the inner wall of the bottomless crucible and the upper surface of the graphite support plate, scraping the material into the discharge hole of the graphite support plate, and removing the scale adhering to the inner wall of the bottomless crucible and the upper surface of the graphite support plate.

[0011] As a further improved technical solution, the furnace cleaning device for a continuous graphitization and purification furnace provided by the present invention also includes a graphite support cylinder and a plurality of graphite inner cylinders; the graphite support cylinder is fixed in the lower cylinder and connected to the lower bottom surface of the graphite support plate, and the graphite support cylinder is provided with a first through hole corresponding to the discharge hole, and a second through hole for the graphite transmission shaft to pass through; the plurality of graphite inner cylinders are arranged in one-to-one correspondence with the first through holes, and the graphite inner cylinders are connected to the through holes of the graphite support cylinder and the collecting bin to transport materials.

[0012] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the graphite inner cylinder portion extends out of the outside of the lower cylinder, and the furnace cleaning device also includes a telescopic joint wrapped around the graphite inner cylinder extending out of the lower cylinder, one end of the telescopic joint is fixed to the lower bottom surface of the lower cylinder, and the other end is fixed to the top of the collection bin.

[0013] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the driving mechanism is connected to the graphite transmission shaft through a transmission assembly, the driving mechanism is arranged outside the collection bin, and the transmission assembly passes through the side wall of the collection bin and is connected to the graphite transmission shaft; the transmission assembly is provided with a water cooling mechanism.

[0014] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the transmission assembly includes a hollow transmission shaft, a gear box, a shaft box 140 and an input shaft, wherein the gear box is located in the material collection bin, the shaft box passes through the outer wall of the material collection bin, and one end is connected to the gear box and the other end is connected to the drive mechanism; an input shaft is provided in the shaft box, and the input shaft is connected to the output end of the drive mechanism and the gear box; the gear box converts the output of the drive mechanism into the rotation of the hollow transmission shaft, and the hollow transmission shaft is coaxially connected to the graphite transmission shaft to drive the graphite transmission shaft to rotate.

[0015] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the driving mechanism includes a reduction motor and a gearbox, and the output end of the input shaft is provided with a bevel driving gear and a bevel driven gear connected to the input end of the hollow transmission shaft to convert the rotation of the input shaft into the rotation of the hollow transmission shaft.

[0016] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the water cooling mechanism includes a cooling return water pipe, which extends from the outside of the collection bin into the axle box, penetrates the gear box, and then extends into the interior of the hollow transmission shaft, then returns to the gear box and the axle box, and extends out of the axle box from the outside of the collection bin, thereby forming a cooling water circuit.

[0017] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the hollow transmission shaft is connected to the gear box via a bearing.

[0018] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein a sealing mechanism is provided between the hollow transmission shaft and the housing of the gear box.

[0019] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, in which the bearing seat is connected to the top of the gear box, the bearing seat and the hollow transmission shaft are sealed by a Y-shaped sealing ring, and the bearing seat and the gear box are sealed by a sealing ring.

[0020] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the two ends of the axle box are respectively provided with an inner bearing seat and an outer bearing seat, and the input shaft is respectively connected to the input shaft inner bearing seat and the input shaft outer bearing seat through a tapered bearing.

[0021] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the bearing seat inside the input shaft is provided with a plurality of semi-waist-shaped grooves for installing water cooling pipes of a water cooling mechanism.

[0022] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the graphite support plate is turned from isostatically pressed graphite, and the upper end is provided with an upper stop connected to the bottomless crucible, and the lower end is provided with a lower stop connected to the graphite support cylinder.

[0023] As a further improved technical solution, the present invention provides a furnace cleaning device for a continuous graphitization and purification furnace, wherein the graphite support cylinder is turned from isostatically pressed graphite, has a sink in the middle, and has a stop at the upper end that matches the lower stop of the graphite support cylinder; the graphite drive shaft has a shoulder that matches the sink.

[0024] The present invention also provides a continuous graphitization and purification furnace having the furnace cleaning device as described in any one of the above items.

[0025] The technical solution provided by the present invention is that the sweeper rotates continuously during operation, scraping the upper surface of the graphite support plate to prevent the formation of sulfide scaling, and at the same time continuously sending the material falling on the graphite support plate into the collection bin. The sweeper also continuously scrapes the inner wall of the bottomless crucible to promptly remove the scaling adhering to the inner wall of the bottomless crucible, thereby reducing non-productive time such as furnace shutdown and furnace dismantling, improving the continuous graphitization production efficiency, and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] FIG1 is a schematic diagram of the front view of a furnace cleaning device for a continuous graphitization and purification furnace according to an embodiment of the present invention;

[0028] FIG2 is a partial enlarged view of FIG1 ;

[0029] FIG3 is a schematic diagram of the three-dimensional structure of a furnace cleaning device for a continuous graphitization and purification furnace according to an embodiment;

[0030] FIG4 is a schematic diagram of the front structure of the sweeper in the embodiment;

[0031] FIG5 is a schematic structural diagram of the A-A direction of FIG4;

[0032] FIG6 is a schematic diagram of a top view of the structure of the sweeper in the embodiment;

[0033] FIG7 is a schematic diagram of the front structure of the graphite support plate in the embodiment;

[0034] FIG8 is a schematic diagram of a top view of the graphite support plate in an embodiment;

[0035] FIG9 is a schematic diagram of the front structure of the graphite support cylinder in the embodiment;

[0036] FIG10 is a schematic diagram of a top view of the graphite support cylinder in an embodiment;

[0037] FIG11 is a schematic structural diagram of a sealing mechanism in an embodiment;

[0038] FIG12 is a schematic diagram of the front view of the bearing seat of the input shaft in the embodiment;

[0039] FIG13 is a schematic cross-sectional view of the bearing seat in the input shaft in the embodiment. Implementation Method

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] As shown in Figures 1 and 3, the continuous graphitization and purification furnace includes a vertical furnace body, a crucible group, a drive mechanism 9 disposed at the bottom of the vertical furnace body, and a graphite drive shaft 5 connected to the drive mechanism 9. The crucible group has a central hole at its axis for the graphite drive shaft 5 to pass through. The graphite drive shaft 5 passes through the crucible group axially through the central hole. The furnace cleaning device for the continuous graphitization and purification furnace includes:

[0042] A lower cylinder 1 having a hollow interior, wherein the lower cylinder 1 is fixed to the bottom of the continuous graphitization and purification furnace;

[0043] A graphite support plate 2 is provided in the lower cylinder 1, and the graphite support plate 2 is connected to the lower bottom surface of the bottomless crucible 3 at the bottom of the crucible group. The graphite support plate 2 is provided with a central hole 30 for the graphite transmission shaft to pass through and a discharge hole 31 for the material to fall;

[0044] A material collecting bin 7, the material collecting bin 7 is connected to the lower opening of the lower cylinder 1 and is in communication with the discharge hole 31 of the graphite support plate 2;

[0045] The sweeper 6 is disposed in the bottomless crucible 3 and is in driving connection with the graphite drive shaft 5. The sweeper 6 is driven by the graphite drive shaft 5 to rotate to scrape the inner wall of the bottomless crucible 3 and the upper surface of the graphite support plate 2 so that the material falls out of the discharge hole 31 and the scale adhering to the inner wall of the bottomless crucible 3 and the upper surface of the graphite support plate is removed.

[0046] The material of the sweeper 6 is isostatic graphite. Referring to Figures 4 to 6, the sweeper 6 has a suspension 11 that is transmission-connected to the graphite drive shaft 5, and a plurality of strip comb teeth 12 connected to the lower bottom surface of the suspension 11. The axes of the strip comb teeth 12 are arranged to intersect obliquely with the axis of the suspension 11. The suspension 11 is keyed to the graphite drive shaft 5. The suspension 11 and the strip comb teeth 12 rotate together with the graphite drive shaft 5. The strip comb teeth 12 scrape the inner wall of the bottomless crucible 3 and the upper surface of the graphite support plate 2, scrape the material into the discharge hole of the graphite support plate 2, and remove the scale adhering to the inner wall of the bottomless crucible 3 and the upper surface of the graphite support plate 2.

[0047] The furnace cleaning device also includes a graphite support cylinder 4 and multiple graphite inner cylinders 8; the graphite support cylinder 4 is fixed in the lower cylinder 1 and connected to the lower bottom surface of the graphite support plate 2, and the graphite support cylinder 4 is provided with a first through hole 33 corresponding to the discharge hole 31, and a second through hole 32 for the graphite transmission shaft 5 to pass through; multiple graphite inner cylinders 8 are arranged in a one-to-one correspondence with the first through hole 33, and the graphite inner cylinder 8 is connected to the first through hole 33 of the graphite support cylinder 4 and the collecting bin 7 for material transmission.

[0048] On the basis of the aforementioned basic scheme, as one of the embodiments, as shown in Figures 1 to 3, the driving mechanism 9 of the furnace cleaning device for continuous graphitization and purification furnace provided by the present invention is connected to the graphite transmission shaft 5 through a transmission assembly, and the driving mechanism 9 is arranged on the outside of the collection bin 7, and the transmission assembly passes through the side wall of the collection bin 7 and is connected to the graphite transmission shaft 5; the transmission assembly is provided with a water cooling mechanism. Exemplarily, a cooling water pipe is provided in the hollow transmission shaft 10, and the hollow transmission shaft 10 is provided with a cooling water pipe to ensure the reliability of the transmission connection; the lower cylinder 1 and the collection bin 7 are respectively provided with water-cooling jackets, and the lower cylinder 1 and the collection bin 7 are provided with interlayer water jackets. Under the cooling effect of the cooling water, the safety of the lower cylinder 1 and the collection bin 7 and the cooling of the material are guaranteed. The water cooling mechanism will be described in detail later.

[0049] On the basis of the aforementioned basic scheme, as one of the embodiments, as shown in Figures 1 and 2, the transmission assembly of the furnace cleaning device for continuous graphitization and purification furnace provided by the present invention includes a hollow transmission shaft 10, a gear box 13, an axle box 140 and an input shaft 14, wherein the gear box 13 is located in the collecting bin 7, the axle box 140 passes through the outer wall of the collecting bin 7, and one end is connected to the gear box 13, and the other end is connected to the driving mechanism 9; an input shaft 14 is provided in the axle box 140, and the input shaft 14 is connected to the output end of the driving mechanism 9 and the gear box 13; the gear box 13 converts the output of the driving mechanism 9 into the rotation of the hollow transmission shaft 10, and the hollow transmission shaft 10 is coaxially connected to the graphite transmission shaft 5 to drive the graphite transmission shaft 5 to rotate.

[0050] The input shaft 14 intersects the axis of the hollow drive shaft 10 at a 90-degree angle. The reduction motor 15 is mounted on the side of the collection bin 7, preventing interference with the feed opening directly below when installed vertically. The hollow drive shaft 10 and the graphite drive shaft 5 are connected via a splined connection at the shaft ends, allowing axial sliding between the hollow drive shaft 10 and the graphite drive shaft 5, thereby eliminating stress generated by the hollow drive shaft 10 and the graphite drive shaft 5 during hot and cold conditions.

[0051] Alternatively, in other embodiments, the transmission assembly may be disposed outside the aggregate box, for example, without using the telescopic joint 27, or with each graphite inner cylinder 8 individually wrapped with a telescopic joint 27; the transmission assembly may be housed in the empty space at the bottom of the lower cylinder 1, excluding the graphite inner cylinder. This may reduce the need for a portion of the water cooling mechanism, but may increase the complexity of the mechanism. Those skilled in the art may select and design the method as needed, and details will not be given here.

[0052] The driving mechanism 9 includes a reduction motor 15 and a gearbox 90. The output end of the input shaft 14 is provided with a bevel driving gear 16 and a bevel driven gear 17 connected to the input end of the hollow transmission shaft 10 to convert the rotation of the input shaft 14 into the rotation of the hollow transmission shaft 10.

[0053] The water cooling mechanism includes a cooling return water pipe 19, which extends from the outside of the aggregate bin 7 into the axle box 140, penetrates the gear box 13 and then extends into the interior of the hollow transmission shaft 10, then returns to the gear box 13 and the axle box 140, and extends from the outside of the aggregate bin 7 to the axle box 140, thus forming a cooling water circuit.

[0054] As shown in FIG12 and FIG13 , the input shaft inner bearing seat 24 is provided with a plurality of semi-waist-shaped grooves 26 , which are used to install water cooling pipes of a water cooling mechanism, such as a cooling water inlet pipe 18 , or as return channels for cooling water.

[0055] The axle box 140 has an input shaft inner bearing seat 24 and an input shaft outer bearing seat 25 at both ends. The input shaft 14 is connected to the input shaft inner bearing seat 24 and the input shaft outer bearing seat 25 via tapered bearings. The tapered raceways of the two tapered bearings connected to the input shaft 14 are arranged symmetrically.

[0056] The gearbox 13 is equipped with a bearing seat 21 and a lower bearing seat for mounting the hollow transmission shaft 10. The bearing seat 21 is connected to the upper portion of the gearbox 13. The hollow transmission shaft 10 is connected to the bearing seat 21 and the lower bearing seat respectively via tapered bearings. The tapered raceways of the two tapered bearings connected to the hollow transmission shaft 10 are arranged symmetrically.

[0057] The two tapered bearings can withstand the axial load generated during the movement of the tapered driving gear 16 and the tapered driven gear 17, and the axial gravity load of the hollow transmission shaft 10. The symmetrical arrangement of the tapered raceways balances the axial force and fixes the position of the input shaft 14 and the hollow transmission shaft 10.

[0058] The hollow transmission shaft 10 is connected to the gear box 13 through a bearing, and a sealing mechanism 20 is provided between the hollow transmission shaft 10 and the housing of the gear box 13 .

[0059] As shown in FIG11 , the bearing seat 21 and the hollow transmission shaft 10 are sealed by a Y-shaped sealing ring 22 , and the bearing seat 21 and the gear box 13 are sealed by a sealing ring 23 .

[0060] The upper end of the furnace cleaning device of the vertical continuous graphitization and purification furnace is connected to the lower part of the vertical continuous graphitization and purification furnace with a flange, and the lower end of the collecting bin 7 is connected to the discharge device with a flange. The upper and lower flange connections are both provided with sealing rings to isolate from the external air, maintain the inert environment in the vertical continuous graphitization and purification furnace, and enable the device to be used safely in a high temperature environment.

[0061] In the production process of vertical continuous graphitization and purification furnace, after the raw materials are calcined at high temperature in an oxygen-free environment, due to the residual sulfides, when the materials leave the high-temperature zone and enter the cooling zone, the sulfides will form solid scale and adhere to the graphite crucible. When the scale accumulates to a certain extent, it is very likely to block the discharge channel and reduce the effective volume of the crucible. In severe cases, it will cause the local temperature at the bottom of the crucible to be too high, resulting in accidents such as furnace shutdown, which requires shutdown for treatment. In the high-temperature zone of the vertical continuous graphitization and purification furnace, a cooling section is entered, and a bottomless crucible 3 and a graphite support plate 2 are provided. Sulfide scaling usually occurs in the bottomless crucible 3 and on the graphite support plate 2. A sweeper 6 is provided in the bottomless crucible 3 and on the graphite support plate 2. The sweeper 6 rotates under the drive of the graphite drive shaft 5, the hollow drive shaft 10 and the drive mechanism 9 to promptly scrape the material and scaling into the discharge hole of the graphite support plate 2, and then into the collection bin 7 through the discharge hole of the graphite support cylinder 4 and the graphite inner cylinder 8. After the material is cooled to a certain degree in the bottomless crucible 3 and on the graphite support plate 2, no scaling is generated in the discharge hole of the graphite support plate 2, the discharge hole of the graphite support cylinder 4, the graphite inner cylinder 8 and the collection bin 7.

[0062] During operation, the sweeper rotates continuously, scraping the upper surface of the graphite support plate 2 to prevent the formation of sulfide scale. At the same time, the material that falls on the graphite support plate 2 is continuously fed into the collection bin 7. The sweeper also continuously scrapes the inner wall of the bottomless crucible 3, promptly removing scale adhering to the inner wall of the bottomless crucible 3. This reduces non-productive time such as furnace shutdown and dismantling, improves continuous graphitization production efficiency, and reduces energy consumption. Practice has shown that after the vertical continuous graphitization and purification furnace is equipped with a furnace cleaning device, the continuous production time is greatly improved, the production capacity is increased by 2 to 3 times, and the electricity and labor costs are reduced by one third.

[0063] Based on the aforementioned basic solution, as one embodiment thereof, as shown in Figures 1 and 3 , the furnace cleaning device for a continuous graphitization and purification furnace provided by the present invention further includes an expansion joint 27 connected to the lower barrel 1. Specifically, the graphite inner barrel 8 partially extends outside the lower barrel 1, and the furnace cleaning device includes an expansion joint 27 wrapped around the graphite inner barrel 8 extending outside the lower barrel 1. One end of the expansion joint 27 is fixed to the lower bottom surface of the lower barrel 1, and the other end is fixed to the top of the collection bin 7. The expansion joint 27 can eliminate stress generated in hot and cold conditions.

[0064] Based on the aforementioned basic solution, as one embodiment thereof, as shown in Figures 7 and 8 , the graphite support plate 2 of the furnace cleaning device for a continuous graphitization and purification furnace provided by the present invention is machined from isostatically pressed graphite. It has an upper stop 28 at its upper end for connection to the bottomless crucible 3, a lower stop 29 at its lower end for connection to the graphite support cylinder 4, a central hole 30 for the graphite drive shaft 5, and a plurality of discharge holes 31 around its periphery. The upper and lower stop 28 and 29 facilitate installation and alignment of the device.

[0065] Based on the aforementioned basic scheme, as one embodiment thereof, as shown in Figures 9 and 10, the graphite support cylinder 4 of the furnace cleaning device for a continuous graphitization and purification furnace provided by the present invention is turned from isostatically pressed graphite, has a second through hole 32 in the middle for the graphite drive shaft 5 to pass through, a plurality of first through holes 33 around the periphery, a sink 34 in the middle, and a stop 35 at the upper end to cooperate with the lower stop 29 of the graphite support cylinder 4; the graphite drive shaft 5 has a shoulder 36 to cooperate with the sink 34. The graphite support cylinder 4 is machined into a cylindrical sink 34 in the middle, which cooperates with the shoulder 36 of the graphite drive shaft 5 to support the graphite drive shaft 5. Since graphite has good lubricating properties, it also plays a lubricating role.

[0066] The present invention is not limited to the above preferred embodiments. Various modifications and improvements can be made within the spirit of the claims and the specification to solve the same technical problems and achieve the desired technical effects. Therefore, they will not be repeated here. All solutions that can be directly or associatively conceived by a person of ordinary skill in the art from the disclosure of the present invention also fall within the scope of protection of the present invention as long as they are within the spirit of the claims.

Claims

1. A furnace cleaning device for a continuous graphitization and purification furnace, the continuous graphitization and purification furnace comprising a vertical furnace body, a crucible group, a driving mechanism arranged at the bottom end of the vertical furnace body, and a graphite transmission shaft connected to the driving mechanism, wherein: The axis of the crucible group is provided with a central hole for the graphite transmission shaft to pass through, and the graphite transmission shaft passes through the crucible group axially through the central hole; it is characterized in that the furnace cleaning device comprises: A lower cylinder with a hollow interior, the lower cylinder being fixed at the bottom of the continuous graphitization and purification furnace; A graphite support plate is arranged in the lower cylinder, the graphite support plate is connected to the lower bottom surface of the bottomless crucible at the bottom of the crucible group, and the graphite support plate is provided with a central hole for the graphite transmission shaft to pass through and a discharge hole for the material to fall; A material collecting bin, which is connected to the lower opening of the lower cylinder and communicates with the discharge hole of the graphite support plate; A sweeper is arranged in the bottomless crucible and is in driving connection with the graphite transmission shaft. The sweeper is driven by the graphite transmission shaft to rotate to scrape the inner wall of the bottomless crucible and the upper surface of the graphite support plate so that the material falls out from the discharge hole, and the scale adhering to the inner wall of the bottomless crucible and the upper surface of the graphite support plate is removed.

2. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 1, characterized in that: The sweeper comprises a suspension drivingly connected to the graphite transmission shaft, and a plurality of strip comb teeth connected to the lower bottom surface of the suspension, wherein the axes of the strip comb teeth are arranged obliquely and intersectingly with the axes of the suspension, and the strip comb teeth scrape the inner wall of the bottomless crucible and the upper surface of the graphite support plate, scrape the material into the discharge hole of the graphite support plate, and remove the scale adhering to the inner wall of the bottomless crucible and the upper surface of the graphite support plate.

3. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 1, characterized in that: It also includes a graphite support cylinder and a plurality of graphite inner cylinders; the graphite support cylinder is fixed in the lower cylinder and connected to the lower bottom surface of the graphite support plate, the graphite support cylinder is provided with a first through hole corresponding to the discharge hole, and a second through hole for the graphite transmission shaft to pass through; the plurality of graphite inner cylinders are arranged in one-to-one correspondence with the first through hole, and the graphite inner cylinder is connected to the first through hole of the graphite support cylinder and the collecting bin to transport the material.

4. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 3, characterized in that: The graphite inner cylinder part extends out of the lower cylinder, and the furnace cleaning device also includes a telescopic joint wrapped on the graphite inner cylinder extending out of the lower cylinder, one end of the telescopic joint is fixed to the lower bottom surface of the lower cylinder, and the other end is fixed to the top of the collection bin.

5. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 1, characterized in that: The driving mechanism is connected to the graphite transmission shaft through a transmission assembly. The driving mechanism is arranged outside the material collection bin. The transmission assembly passes through the side wall of the material collection bin and is connected to the graphite transmission shaft. A water cooling mechanism is provided on the transmission assembly.

6. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 5, characterized in that: The transmission assembly includes a hollow transmission shaft, a gear box, an axle box and an input shaft. The gear box is located in the material collection bin. The axle box passes through the outer wall of the material collection bin and is connected to the gear box at one end and to the driving mechanism at the other end. An input shaft is arranged in the axle box, and the input shaft is connected to the output end of the driving mechanism and the gear box. The gear box converts the output of the driving mechanism into the rotation of the hollow transmission shaft. The hollow transmission shaft is coaxially connected to the graphite transmission shaft to drive the graphite transmission shaft to rotate.

7. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 6, characterized in that: The driving mechanism includes a reduction motor and a gearbox. The output end of the input shaft is provided with a conical driving gear and a conical driven gear connected to the input end of the hollow transmission shaft to convert the rotation of the input shaft into the rotation of the hollow transmission shaft.

8. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 6, characterized in that: The water cooling mechanism includes a cooling return water pipe, which extends from the outside of the material collection bin into the axle box, penetrates the gear box and then extends into the interior of the hollow transmission shaft, returns to the gear box and the axle box, and extends out of the axle box from the outside of the material collection bin, thus forming a cooling water circuit.

9. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 6, characterized in that: The hollow transmission shaft is connected to the gear box via a bearing.

10. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 9, characterized in that: A sealing mechanism is provided between the hollow transmission shaft and the housing of the gear box.

11. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 10, characterized in that: The bearing seat is connected to the upper part of the gear box, the bearing seat and the hollow transmission shaft are sealed by a Y-shaped sealing ring, and the bearing seat and the gear box are sealed by a sealing ring.

12. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 6, characterized in that: An inner bearing seat and an outer bearing seat are respectively arranged at two ends of the axle box, and the input shaft is connected to the input shaft inner bearing seat and the input shaft outer bearing seat respectively through a tapered bearing.

13. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 12, characterized in that: The bearing seat inside the input shaft is provided with a plurality of semi-waist-shaped grooves, and the semi-waist-shaped grooves are used for installing water cooling pipes of a water cooling mechanism.

14. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 3, characterized in that: The graphite support plate is formed by turning isostatic graphite, and an upper end is provided with an upper stop connected to the bottomless crucible, and a lower end is provided with a lower stop connected to the graphite support cylinder.

15. The furnace cleaning device for a continuous graphitization and purification furnace according to claim 14, characterized in that: The graphite support cylinder is made of isostatic graphite and has a sink in the middle and a stop at the upper end that matches the lower stop of the graphite support cylinder; the graphite transmission shaft has a shaft shoulder that matches the sink.

16. A continuous graphitization and purification furnace, characterized in that: A furnace cleaning device as claimed in any one of claims 1 to 15.

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