A raw material impurity removal device for boron nitride fiber production

Abstract

The present invention relates to the technical field of pickling and impurity removal, and provides a raw material impurity removal device for boron nitride fiber production, a horizontal sealing cylinder, a sealing module, a centrifugal impurity removal module and a transfer module. The horizontal sealing cylinder is fixedly provided with a feeding pipe, a discharging pipe, a first treatment liquid inlet pipe, a cleaning liquid inlet pipe, a second treatment liquid inlet pipe, a waste discharge pipe and axial ribs. Both ends of the filter cylinder of the sealing module are fixedly provided with piston parts, the piston part is in sliding contact with the inner wall of the horizontal sealing cylinder, a first limiting groove is provided on the surface of the piston part, and the axial rib is in sliding contact with the first limiting groove. The centrifugal impurity removal module is arranged on the inner side of the filter cylinder, and the first winding part and the second winding part in the transfer module are respectively fixedly provided at both ends of the horizontal sealing cylinder, one end of the two groups of traction parts are respectively wound on the first winding part and the second winding part, and the other end of the traction part is fixedly connected to the movable plate, and the piston part is connected to the movable plate. The device has the characteristics of wide application range, good pickling and impurity removal effect and high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of pickling and impurity removal, in particular to a raw material impurity removal device for producing boron nitride fibers. Background Art

[0002] The step-by-step pickling method is an effective method for removing impurities from boron nitride (BN) fibers. Depending on the chemical properties of the pickling solution, the pickling operation methods include the following two:

[0003] (1) When the purity of boron nitride (BN) fiber is required to be high, double-kettle pickling must be performed: for example, when dilute hydrochloric acid is used to remove metal impurities in one kettle first, before concentrated nitric acid oxidation treatment, it is impossible or impossible to completely clean the dilute hydrochloric acid in the kettle (mainly the residual dilute hydrochloric acid in the inner wall of the kettle top and the liquid inlet pipe, which are difficult to clean), or a large amount of cleaning liquid is required to clean it thoroughly. If the container is not replaced, the residual dilute hydrochloric acid will cause the acid solution to be diluted or concentrated, or it may mix with nitric acid to generate chlorine (Cl2), or mix with hydrofluoric acid to generate hydrogen fluoride (HF), threatening safety and equipment integrity. It may also produce solid deposits (such as lead sulfate) that adhere to the fiber surface or the inner wall of the equipment and are difficult to remove. Therefore, the boron nitride (BN) fiber needs to be transferred to another kettle for oxidation treatment with concentrated nitric acid.

[0004] (2) Single-pot pickling: When the difference in the pickling steps is only reflected in the acid concentration or temperature gradient (such as only adjusting the concentration of the same acid solution), and there is no need to change the solvent type (such as the entire process is aqueous pickling), it can be completed in the same container.

[0005] However, double-kettle pickling still has the following defects: in order to facilitate transfer, the boron nitride (BN) fiber in the kettle needs to be wrapped with a filter before being moved by a robotic arm. Since the boron nitride (BN) fiber needs to be cleaned before transfer, the boron nitride (BN) fiber at this time lacks support and protection. Especially when frequent transfer and cleaning are required, it is more likely to be mechanically damaged or clumped during the transportation process.

[0006] This application applies the design inspiration of the piston syringe to the stepped pickling and impurity removal of boron nitride fiber, so as to replace the traditional single-pot pickling and double-pot pickling impurity removal methods, thereby overcoming the above defects. Summary of the Invention

[0007] The object of the present invention is to provide a raw material impurity removal device for boron nitride fiber production, aiming to solve the problems existing in the existing boron nitride fiber pickling and impurity removal equipment.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a raw material impurity removal device for boron nitride fiber production, comprising:

[0009] A horizontal sealing cylinder is fixedly provided with a feeding pipe, a feeding pipe, a first treatment liquid inlet pipe, a cleaning liquid inlet pipe, a second treatment liquid inlet pipe, a waste pipe and an axial rib. The feeding pipe and the feeding pipe as well as the cleaning liquid inlet pipe and the waste pipe correspond to each other in the upper and lower parts. The cleaning liquid inlet pipe is distributed between the first treatment liquid inlet pipe and the second treatment liquid inlet pipe. The surface of the axial rib is provided with several groups of annular grooves.

[0010] A sealing module comprising a filter cartridge, a piston member, and a first limiting groove. Piston members are fixedly provided at both ends of the filter cartridge, the piston member being in sliding contact with the inner wall of the horizontal sealing cartridge. A first limiting groove is provided on the surface of the piston member, and the axial rib is in sliding contact with the first limiting groove.

[0011] A centrifugal impurity removal module is arranged inside the filter cartridge;

[0012] The transfer module includes a first winding part, a second winding part, a traction member and a movable plate. The first winding part and the second winding part are respectively fixedly arranged at the two ends of the horizontal sealing cylinder. One end of the two groups of traction members are respectively wound on the first winding part and the second winding part. The other end of the traction member is fixedly connected to the movable plate, and the piston member is connected to the movable plate.

[0013] As a further solution of the present invention, the centrifugal impurity removal module includes a centrifugal cylinder, a first opening, a first driving member and a first central tube. One end of the centrifugal cylinder is fixedly connected to the first central tube. The first driving member is fixedly connected to the movable plate. The first driving member is used to control the rotation of the centrifugal cylinder. Several first openings are provided on the surface of the centrifugal cylinder.

[0014] As a further solution of the present invention, the transfer module further includes a bracket and a second limiting groove, the second limiting groove is provided on the surface of the movable plate, the axial rib is in sliding contact with the second limiting groove, and the bracket is fixedly connected to the movable plate.

[0015] As a further solution of the present invention, the sealing module includes a second opening, a second driving member, a second center tube and a limiting ring. The piston member is fixedly connected to the second center tube. A limiting ring is provided on the surface of the second center tube. The bracket is sleeved in the limiting ring. A second opening is provided on the surface of the filter cartridge. The second driving member is fixedly connected to the movable plate. The second driving member is used to control the rotation of the second center tube. The first center tube is sleeved in the second center tube.

[0016] As a further solution of the present invention, the transfer module also includes a fixed rod, an inclined plate, a blanking port and a material guide trough. The movable plate is fixedly connected to the fixed rod. The fixed rod passes through the first central tube. The surface of the fixed rod is fixedly provided with an inclined plate. The surface of the inclined plate is provided with a blanking port and a material guide trough. The inner wall of the centrifugal cylinder is in sliding contact with the inclined plate.

[0017] As a further solution of the present invention, axial protrusions are provided on both sides of the first opening, and the axial protrusions are in sliding contact with the inner wall of the filter cartridge.

[0018] As a further solution of the present invention, the sealing module and the centrifugal impurity removal module are both provided with angle sensors, and a displacement sensor is provided on the outside of the piston member.

[0019] Beneficial effects of the present invention: This application applies the design inspiration of the piston syringe to the technical solution of the stepped pickling and impurity removal of boron nitride fibers. Compared with the traditional operation method of the stepped pickling and impurity removal of boron nitride fibers (transferring and cleaning the materials between two kettles), it not only has the technical advantage of thorough drainage, but can also ensure that the pickling liquid is prevented from cross-contamination during the stepped pickling process, but also can reduce the risk of loss or damage of boron nitride fibers during the transfer process, and greatly shorten the time for cleaning the materials, thereby minimizing manual intervention. It is not only suitable for the single-kettle pickling method, but also for the double-kettle pickling method, and has the characteristics of a wide range of applications, good pickling and impurity removal effect and a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a first planar cross-sectional view of the present invention.

[0021] Figure 2 It is a perspective view of the present invention.

[0022] Figure 3 It is an exploded view of the present invention.

[0023] Figure 4 This is a three-dimensional diagram of a centrifugal impurity removal module according to an embodiment of the present invention.

[0024] Figure 5 This is a three-dimensional diagram of a sealing module according to an embodiment of the present invention.

[0025] Figure 6 3D is a perspective view of a transfer module according to an embodiment of the present invention.

[0026] Figure 7 This is an assembly diagram of the centrifugal impurity removal module, sealing module and transfer module according to an embodiment of the present invention.

[0027] Figure 8 It is a second planar cross-sectional view of the present invention.

[0028] Figure 9 It is a third planar cross-sectional view of the present invention.

[0029] Figure 10 For the present invention Figure 9 A partial enlarged view of point a in the middle.

[0030] Reference numerals: 1-horizontal sealing cylinder, 11-liner, 12-feeding pipe, 13-discharging pipe, 14-first treatment liquid inlet pipe, 15-cleaning liquid inlet pipe, 16-second treatment liquid inlet pipe, 17-waste discharge pipe, 18-axial rib, 19-annular groove;

[0031] 2- centrifugal impurity removal module, 21- centrifugal cylinder, 211- first opening, 212- axial protrusion, 22- first driving member, 23- first central tube;

[0032] 3-sealing module, 31-filter cartridge, 311-second opening, 32-piston, 321-first limiting groove, 33-second driving member, 34-second center tube, 341-limiting ring;

[0033] 4-transfer module, 41-first winding part, 42-second winding part, 43-traction member, 44-movable plate, 441-bracket, 442-second limiting groove, 45-fixing rod, 46-inclined plate, 461-dropping port, 462-material guide chute;

[0034] 5-Displacement sensor;

[0035] 6- Angle sensor. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0038] See also Figures 1 to 10 In one embodiment of the present invention, a raw material impurity removal device for producing boron nitride fiber includes:

[0039] A horizontal sealing cylinder 1 is fixedly provided with a liner 11, a feeding pipe 12, a feeding pipe 13, a first treatment liquid inlet pipe 14, a cleaning liquid inlet pipe 15, a second treatment liquid inlet pipe 16, a waste pipe 17 and an axial rib 18. The feeding pipe 12 and the feeding pipe 13 as well as the cleaning liquid inlet pipe 15 and the waste pipe 17 correspond to each other up and down. The cleaning liquid inlet pipe 15 is distributed between the first treatment liquid inlet pipe 14 and the second treatment liquid inlet pipe 16. The surface of the axial rib 18 is provided with several groups of annular grooves 19. The positions of the annular grooves 19 correspond to the positions of the feeding pipe 12, the first treatment liquid inlet pipe 14, the cleaning liquid inlet pipe 15 and the second treatment liquid inlet pipe 16;

[0040] The sealing module 3 includes a filter cartridge 31, a piston member 32 and a first limiting groove 321. The piston member 32 is fixedly provided at both ends of the filter cartridge 31. The piston member 32 is in sliding contact with the inner wall of the horizontal sealing cylinder 1. The surface of the piston member 32 is provided with a first limiting groove 321. The axial rib 18 is in sliding contact with the first limiting groove 321. The piston member 32 is composed of a stainless steel disc and a rubber sleeve. The rubber sleeve is provided on the surface of the stainless steel disc to achieve a good sealing effect. In order to improve the sealing effect of the piston member 32, the thickness of the stainless steel disc and the rubber sleeve can be appropriately increased. Considering the service life of the rubber sleeve, a maintenance area can also be provided in the horizontal sealing cylinder 1. When the piston member 32 is moved into the maintenance area, it is convenient to replace and repair it.

[0041] A centrifugal impurity removal module 2 is provided inside the filter cartridge 31;

[0042] The transfer module 4 includes a first winding portion 41, a second winding portion 42, a traction member 43 and a movable plate 44. The first winding portion 41 and the second winding portion 42 are respectively fixedly arranged at both ends of the horizontal sealing cylinder 1. One end of the two groups of traction members 43 are respectively wound on the first winding portion 41 and the second winding portion 42. The other end of the traction member 43 is fixedly connected to the movable plate 44. The piston member 32 is connected to the movable plate 44. The traction member 43 is a steel cable or a traction belt. The internal structures of the first winding portion 41 and the second winding portion 42 are consistent, and both are composed of a driving motor and a winding wheel. It should be noted that the thickness of the movable plate 44 must be greater than the maximum thickness of the piston member 32 to prevent the movable plate 44 from having an angle offset when passing through the annular groove 19.

[0043] See also Figure 6 and Figure 7 Furthermore, the transfer module 4 also includes a bracket 441 and a second limiting groove 442. The second limiting groove 442 is provided on the surface of the movable plate 44. The axial rib 18 is in sliding contact with the second limiting groove 442. The bracket 441 is fixedly connected to the movable plate 44.

[0044] See also Figure 4 and Figure 7 Furthermore, the centrifugal impurity removal module 2 includes a centrifugal cylinder 21, a first opening 211, a first driving member 22 and a first central tube 23. One end of the centrifugal cylinder 21 is fixedly connected to the first central tube 23. The first driving member 22 is fixedly connected to the movable plate 44. The first driving member 22 is used to control the rotation of the centrifugal cylinder 21. Several first openings 211 are provided on the surface of the centrifugal cylinder 21.

[0045] See also Figure 5 and Figure 7Furthermore, the sealing module 3 includes a second opening 311, a second driving member 33, a second center tube 34 and a limiting ring 341, the piston member 32 is fixedly connected to the second center tube 34, a limiting ring 341 is provided on the surface of the second center tube 34, the bracket 441 is sleeved in the limiting ring 341, a second opening 311 is provided on the surface of the filter cartridge 31, the second driving member 33 is fixedly connected to the movable plate 44, the second driving member 33 is used to control the rotation of the second center tube 34, the first center tube 23 is sleeved in the second center tube 34, the internal structures of the first driving member 22 and the second driving member 33 are the same, both of which are composed of a driving motor and a driving gear, and the surfaces of the first center tube 23 and the second center tube 34 are fixedly provided with a transmission gear, and the driving gear is connected to the transmission gear.

[0046] In an embodiment of the present invention, all parts that can come into contact with the pickling liquid in this technical solution need to be made of corrosion-resistant materials or need to be treated with anti-corrosion. The sealing module 3 and the centrifugal impurity removal module 2 are both provided with an angle sensor 6. A displacement sensor 5 is provided on the outside of the piston member 32, and a liquid level sensor is also fixedly provided on the inside of the piston member 32. The angle sensor 6 is used to monitor the angles of the sealing module 3 and the centrifugal impurity removal module 2, so as to facilitate precise adjustment of the positions of the first opening 211 and the second opening 311. The displacement sensor 5 is used to precisely adjust the positions of the sealing module 3 and the centrifugal impurity removal module 2. The liquid level sensor is used to monitor the liquid level height of the pickling liquid. The position of the waste pipe 17 is set so that the pickling liquid used in the two pickling operations is discharged from the waste pipe 17, avoiding the risk of pickling liquid remaining inside the drain pipe in the traditional pickling method.

[0047] See also Figure 6 and Figure 10 In one embodiment of the present invention, the transfer module 4 further includes a fixed rod 45, an inclined plate 46, a material dropout port 461 and a material guide trough 462. The movable plate 44 is fixedly connected to the fixed rod 45. The fixed rod 45 passes through the first central tube 23. The surface of the fixed rod 45 is fixedly provided with an inclined plate 46. The surface of the inclined plate 46 is provided with a material dropout port 461 and a material guide trough 462. The inner wall of the centrifugal cylinder 21 is in sliding contact with the inclined plate 46.

[0048] In the embodiment of the present invention, axial protrusions 212 are provided on both sides of the first opening 211, and the axial protrusions 212 are in sliding contact with the inner wall of the filter cartridge 31, and the working principle of pickling of the centrifugal impurity removal module 2 is utilized: since each first opening 211 and its corresponding axial protrusion 212 can form a receiving groove with the inner wall of the filter cartridge 31, when the first driving member 22 controls the centrifugal cartridge 21 to rotate, the rotating receiving groove can sequentially drop the material located therein from above the inclined plate 46. Before the acid liquid has not submerged the inclined plate 46, the dropped material can flow along the guide groove 462 to the drop port 461 together with the falling pickling liquid. On the one hand, the purpose of batch mixing can be achieved. On the other hand, when the lumped or clumped material appears, the material can be effectively broken up under the dual impact of gravity and the pickling liquid flow. As the pickling liquid slowly submerges the inclined plate 46, the resistance between the receiving groove and the pickling liquid can also play a stirring role, thereby maximizing the contact area between the material and the pickling liquid.

[0049] When the pickled material needs to be discharged from the discharge pipe 13, the second driving member 33 is first used to drive the second opening 311 of the filter cartridge 31 to be aligned with the discharge pipe 13, and then the first driving member 22 is used to control the centrifugal cylinder 21 to rotate at a uniform speed. The material in the centrifugal cylinder 21 can be discharged through the first opening 211 and the second opening 311 in turn. The axial protrusion 212 and the inclined plate 46 are in line contact with the filter cartridge 31 and the centrifugal cylinder 21 respectively, which can also prevent material blockage, residue or waste liquid residue during the pickling, waste discharge and material discharge processes.

[0050] Working principle: Step 1. First, the first winding portion 41 and the second winding portion 42 are used to drive the second opening 311 of the filter cartridge 31 to be distributed below the feeding tube 12 by winding and releasing the traction member 43. The position of the second opening 311 can be adjusted, and the boron nitride fiber is transported from the second opening 311 and the first opening 211 to the centrifugal cylinder 21 by the feeding tube 12. It should be noted that at this time, both piston members 32 are located in the annular groove 19. The rotation of the filter cartridge 31 and the piston member 32 can be controlled by the second driving member 33. When the material needs to be discharged, the second opening 311 is controlled to be aligned with the discharge tube 13.

[0051] Step 2: When the sealing module 3 needs to be moved to the bottom of the first treatment liquid inlet pipe 14 for pickling (the pickling liquid is hydrochloric acid), the first winding portion 41 and the second winding portion 42 cooperate with each other to drive the second opening 311 of the filter cartridge 31 to be distributed below the first treatment liquid inlet pipe 14. At this time, the movable plate 44 and the piston member 32 respectively cooperate with the axial rib 18 through the second limiting groove 442 and the first limiting groove 321, and the first driving member 22 is used to control the rotation of the centrifugal cylinder 21 to pickle and remove impurities from the boron nitride fiber.

[0052] Step 3: When the sealing module 3 needs to be moved to the bottom of the second treatment liquid inlet pipe 16 for secondary pickling (the pickling liquid is nitric acid), the second opening 311 of the filter cartridge 31 needs to be distributed below the cleaning liquid inlet pipe 15 according to the above method. Since the two piston members 32 are both located in the annular groove 19 at this time, the movable plate 44 is still limited by the axial rib 18. Therefore, the hydrochloric acid solution on the surface of the centrifugal cylinder 21 and the filter cartridge 31 can be thoroughly cleaned by controlling the rotation of the centrifugal cylinder 21 and the filter cartridge 31 by the first driving member 22 and the second driving member 33 respectively, and the waste liquid after cleaning can be completely cleaned. It can be discharged directly through the waste pipe 17. It should be noted that when the sealing module 3 moves to the bottom of the second treatment liquid inlet pipe 16, the waste liquid remaining on the inner wall of the horizontal sealing cylinder 1 can also be cleaned into the waste pipe 17. Compared with the traditional single-kettle or double-kettle pickling and impurity removal method, it has the characteristic of thorough waste discharge, thereby preventing the waste liquid from reacting with nitric acid to cause damage to the material. After the second opening 311 of the filter cartridge 31 is distributed below the second treatment liquid inlet pipe 16 according to the above method, the boron nitride fiber is subjected to secondary pickling and impurity removal using the above pickling method.

[0053] In summary, this application applies the design inspiration of the piston syringe to the technical solution of the stepped pickling and impurity removal of boron nitride fibers. Compared with the traditional operation method of the stepped pickling and impurity removal of boron nitride fibers (transferring and cleaning the materials between the two kettles), it not only has the technical advantage of thorough drainage, but also can ensure that the pickling liquid is prevented from cross-contamination during the stepped pickling process. It can also reduce the risk of loss or damage of boron nitride fibers during the transfer process, and greatly shorten the time for cleaning the materials, thereby minimizing manual intervention. It is not only suitable for single-kettle pickling methods, but also for double-kettle pickling methods. It has the characteristics of wide applicability, good pickling and impurity removal effect and high degree of automation.

[0054] For those skilled in the art, although several embodiments and examples of the present invention have been described, these embodiments and examples are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the invention.

[0055] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A raw material impurity removal device for boron nitride fiber production, characterized in that: include: A horizontal sealing cylinder (1) is fixedly provided with a feeding pipe (12), a feeding pipe (13), a first treatment liquid inlet pipe (14), a cleaning liquid inlet pipe (15), a second treatment liquid inlet pipe (16), a waste pipe (17) and an axial rib (18); the feeding pipe (12) and the feeding pipe (13) as well as the cleaning liquid inlet pipe (15) and the waste pipe (17) are all arranged in correspondence with each other in the upper and lower parts; the cleaning liquid inlet pipe (15) is distributed between the first treatment liquid inlet pipe (14) and the second treatment liquid inlet pipe (16); and a plurality of annular grooves (19) are provided on the surface of the axial rib (18); A sealing module (3), the sealing module (3) comprising a filter cartridge (31), a piston member (32) and a first limiting groove (321), the filter cartridge (31) being fixedly provided with a piston member (32) at both ends, the piston member (32) being in sliding contact with the inner wall of the horizontal sealing cartridge (1), the surface of the piston member (32) being provided with the first limiting groove (321), and the axial rib (18) being in sliding contact with the first limiting groove (321); A centrifugal impurity removal module (2) is arranged inside the filter cartridge (31); A transfer module (4) comprising a first winding portion (41), a second winding portion (42), a traction member (43) and a movable plate (44); the first winding portion (41) and the second winding portion (42) are respectively fixedly arranged at two ends of a horizontal sealing cylinder (1); one end of two groups of traction members (43) are respectively wound around the first winding portion (41) and the second winding portion (42); the other end of the traction member (43) is fixedly connected to the movable plate (44); and the piston member (32) is connected to the movable plate (44).

2. The raw material impurity removal device for boron nitride fiber production according to claim 1, characterized in that: The centrifugal impurity removal module (2) comprises a centrifugal cylinder (21), a first opening (211), a first driving member (22) and a first central tube (23); one end of the centrifugal cylinder (21) is fixedly connected to the first central tube (23); the first driving member (22) is fixedly connected to the movable plate (44); the first driving member (22) is used to control the rotation of the centrifugal cylinder (21); and a plurality of first openings (211) are provided on the surface of the centrifugal cylinder (21).

3. The raw material impurity removal device for boron nitride fiber production according to claim 2, characterized in that: The transfer module (4) further comprises a bracket (441) and a second limiting groove (442); the second limiting groove (442) is provided on the surface of the movable plate (44); the axial rib (18) is in sliding contact with the second limiting groove (442); and the bracket (441) is fixedly connected to the movable plate (44).

4. The raw material impurity removal device for boron nitride fiber production according to claim 3, characterized in that: The sealing module (3) includes a second opening (311), a second driving member (33), a second center tube (34) and a limiting ring (341); the piston member (32) is fixedly connected to the second center tube (34); a limiting ring (341) is provided on the surface of the second center tube (34); the bracket (441) is sleeved in the limiting ring (341); a second opening (311) is provided on the surface of the filter cartridge (31); the second driving member (33) is fixedly connected to the movable plate (44); the second driving member (33) is used to control the rotation of the second center tube (34); and the first center tube (23) is sleeved in the second center tube (34).

5. The raw material impurity removal device for boron nitride fiber production according to claim 4, characterized in that: The transfer module (4) further comprises a fixed rod (45), an inclined plate (46), a material drop opening (461) and a material guide trough (462); the movable plate (44) is fixedly connected to the fixed rod (45); the fixed rod (45) passes through the first central tube (23); the surface of the fixed rod (45) is fixedly provided with an inclined plate (46); the surface of the inclined plate (46) is provided with a material drop opening (461) and a material guide trough (462); the inner wall of the centrifugal cylinder (21) is in sliding contact with the inclined plate (46).

6. The raw material impurity removal device for boron nitride fiber production according to claim 2, characterized in that: Axial protrusions (212) are provided on both sides of the first opening (211), and the axial protrusions (212) are in sliding contact with the inner wall of the filter cartridge (31).

7. The raw material impurity removal device for boron nitride fiber production according to claim 1, characterized in that: The sealing module (3) and the centrifugal impurity removal module (2) are both provided with an angle sensor (6), and a displacement sensor (5) is provided on the outside of the piston member (32).

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