A precipitation machine for aramid fiber preparation and aramid fiber precipitation method

Abstract

The present application relates to aramid fiber manufacturing equipment technical field, specifically relates to a kind of for aramid fiber preparation's precipitation machine and aramid fiber precipitation method. Including: mixing cavity, coagulant runner and slurry conveying runner, coagulant runner and slurry conveying runner are communicated mixing cavity;Slurry conveying runner includes a group of array setting feed hole, feed hole is arranged on the side wall of mixing cavity;Further include: rotationally arranged in mixing cavity mixing rotor, the radial outer end of the mixing rotor is equipped with scraper head, and the scraper head is used to scrape the slurry entering the mixing cavity from feed hole;The inner side of scraper head is equipped with stirring blade;Drive device, the drive device includes the drive shaft connected to mixing rotor;Discharge port is set on mixing cavity. Can improve dispersion efficiency, precipitate downy short fiber, improve the uniformity of fiber slurry after precipitation process.

Description

Technical Field

[0001] This invention relates to the field of aramid fiber manufacturing equipment technology, specifically to a precipitation machine and a precipitation method for aramid fibers. Background Technology

[0002] Meta-aramid fibers are widely used as raw materials in industries such as specialty paper and bulletproof vests. The aramid fiber polymer slurry and coagulant need to be mixed in appropriate proportions and undergo steps including precipitation, solidification, filtration, washing, and dehydration to ultimately obtain aramid precipitated fibers. The precipitation process is the key step in obtaining aramid fibers.

[0003] The principle of existing precipitation equipment is to inject aramid fiber slurry into a coagulant and disperse the slurry by shear blades. In order to fully disperse the slurry, the slurry needs to be sheared and dispersed for a long time, and the overall dispersion efficiency is not high. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a precipitation machine for the preparation of aramid fibers, which can improve dispersion efficiency, precipitate downy short fibers, and improve the uniformity of fiber slurry after the precipitation process.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A sedimentation machine for the preparation of aramid fibers includes: a mixing chamber, a coagulant channel, and a slurry conveying channel, wherein the coagulant channel and the slurry conveying channel are connected to the mixing chamber; The slurry conveying channel includes an array of feed holes arranged on the side wall of the mixing chamber; it also includes: A mixing rotor is rotatably disposed in the mixing chamber. The outer radial end of the mixing rotor is provided with a scraper head, which is used to scrape off the slurry entering the mixing chamber from the feed hole. A stirring blade is provided on the inner side of the scraper head. The drive device includes a drive shaft connected to the mixing rotor; The discharge port is located on the mixing chamber.

[0006] Furthermore, a precipitation machine for preparing aramid fibers according to this application also includes a spiral conveying blade, which is coaxially mounted on a drive shaft with the mixing rotor, and the conveying chamber of the spiral conveying blade is connected to the coagulant channel and the mixing chamber. As a preferred embodiment of this application, the use of a spiral conveying blade has the advantage of stable material conveying.

[0007] Furthermore, in a sedimentation machine for aramid fiber preparation according to this application, the spiral conveying blades extend spirally along the drive shaft to the bottom of the mixing chamber, the mixing rotor is integrated on the spiral conveying blades, and the scraper and stirring blades are disposed on the spiral conveying blades. As a preferred embodiment of this application, the spiral conveying blades extending into the mixing chamber improve the stability of the liquid flow within the mixing chamber, and the overall conveying channel within the mixing chamber is lengthened, ensuring that the slurry is fully dispersed in the coagulant, and improving the stability of the fiber slurry conveyed within the mixing chamber, preventing agglomeration during stirring.

[0008] Furthermore, in a sedimentation machine for aramid fiber preparation according to this application, the scraper and stirring blades are integrated into one unit, with the scraper disposed at the radially outer end of the stirring blades. As a preferred embodiment of this application, the sedimentation machine for aramid fiber preparation further includes a shell, a coagulant channel disposed on the shell, a cutting wall inside the shell, and a slurry conveying channel including a slurry inlet and a filling chamber. The slurry inlet is disposed on the shell, the filling chamber is disposed between the shell and the cutting wall, and the feed hole is disposed on the cutting wall. As a preferred embodiment of this application, the aramid fiber slurry enters from the slurry inlet, fills the filling chamber, and is then extruded into the mixing chamber through the feed hole. The filling chamber is used to ensure uniform distribution outside each feed hole, thereby improving the uniformity of the aramid fiber slurry extruded into the mixing chamber.

[0009] Furthermore, in this application, a sedimentation machine for preparing aramid fibers is provided at the bottom of the mixing chamber. The dispersing stator includes a set of dispersing teeth arranged in a circumferential array. A flow gap is provided between adjacent dispersing teeth. A centrifugal dispersing chamber is provided inside the dispersing teeth. The centrifugal dispersing chamber is connected to the mixing chamber. A centrifugal impeller is provided inside the centrifugal dispersing chamber. The centrifugal impeller is mounted on a drive shaft.

[0010] After being mixed in the mixing chamber, the fiber slurry enters the centrifugal dispersion chamber and is discharged through the centrifugal impeller. During this process, the fiber slurry passes through the dispersion teeth and flows out from the flow gaps between the dispersion teeth, further improving the uniformity of slurry dispersion.

[0011] Furthermore, in this application, a sedimentation machine for the preparation of aramid fibers is provided, wherein the centrifugal impeller includes a disc mounted on a drive shaft, the disc corresponding to the axial end of the centrifugal dispersion chamber, and a first blade disposed on the disc inside the centrifugal dispersion chamber.

[0012] Furthermore, in this application, a sedimentation machine for preparing aramid fibers includes a centrifugal impeller comprising a third blade. The third blade is positioned at the end of the impeller away from the first blade, and the discharge port is located radially outward of the third blade. As a preferred embodiment of this application, the fiber slurry in the centrifugal dispersion chamber is discharged through the discharge port sequentially via the first blade, the second blade, and the third blade, preventing the slurry from becoming too viscous and stagnating. The first, second, and third blades are integrated onto the impeller, resulting in high integration and saving space.

[0013] Furthermore, a precipitation machine for preparing aramid fibers according to this application also includes a mechanical sealing assembly, the mechanical sealing assembly comprising: A mechanical seal housing, wherein the mechanical seal housing is mounted at the end of the housing, and a drive shaft passes through the mechanical seal housing; A sealing sleeve, the sealing sleeve including a frame mounted on a mechanical seal housing, the frame having an annular sealing plate, the inner edge of the annular sealing plate abutting against the side wall of the drive shaft; The mechanical seal housing is provided with a pressure boosting chamber, which is located on the axial outer side of the sealing sleeve. A flow channel connects the pressure boosting chamber and the sealing sleeve. A pressure boosting impeller is provided inside the pressure boosting chamber and is mounted on the drive shaft.

[0014] A method for precipitation of aramid fibers, based on a precipitation machine for the preparation of aramid fibers according to this application, includes the following steps: S1: The coagulant and aramid fiber slurry are fed into the mixing chamber from the coagulant channel and the slurry conveying channel respectively in a preset volume ratio; S2: Rotate the mixing rotor to scrape the aramid fiber slurry squeezed into the feed hole through the scraper head, and mix the aramid fiber slurry into the coagulant through the stirring blades; S3: The mixed slurry is discharged from the outlet and collected.

[0015] As can be seen from the above technical solution, the present invention has the following beneficial effects: This invention provides a sedimentation machine for aramid fiber preparation. A coagulant channel and a slurry conveying channel respectively transport the coagulant and aramid fiber slurry into a mixing chamber. A set of feed holes disperses the aramid fiber slurry transported into the mixing chamber. A drive shaft drives a mixing rotor to rotate. During rotor rotation, a scraper separates the aramid fiber slurry squeezed into the mixing chamber from the feed holes. Stirring blades uniformly disperse the separated aramid fiber slurry within the coagulant, forming a diffused mixture. Finally, the liquid in the mixing chamber is discharged and collected from the outlet. Therefore, this sedimentation machine for aramid fiber preparation improves dispersion efficiency, precipitates downy short fibers, enhances the uniformity of the fiber slurry after sedimentation, and effectively avoids the formation of large agglomerates. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a precipitation machine for preparing aramid fibers according to one embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of area A in the center circle; Figure 3 for Figure 1 A magnified view of a portion of area B in the center circle; Figure 4 for Figure 1 A schematic diagram of the spiral conveying blades and mixing rotor of a sedimentation machine used for the preparation of aramid fibers; Figure 5 This is an exploded schematic diagram of the dispersed stator and centrifugal impeller in one embodiment of this application; Figure 6 This is a schematic diagram of a centrifugal impeller (with a second blade) in one embodiment of this application. Figure 7 This is a schematic diagram of a centrifugal impeller (without a second blade) in one embodiment of this application. Figure 8 This is a schematic diagram of a sealing sleeve in one embodiment of this application; Figure 9 This is a schematic diagram of a booster impeller in one embodiment of this application; Figure 10 This is a schematic diagram of a precipitation machine for preparing aramid fibers according to another embodiment of this application; Figure 11 for Figure 10 A magnified view of a portion of area C in the middle circle; Figure 12 for Figure 10 A schematic diagram of a spiral conveying blade and a mixing rotor for a sedimentation machine used in the preparation of aramid fibers.

[0017] In the picture: 1-Shell; 10-Mixing chamber; 101-Coagulant channel; 102-Slurry conveying channel; 1020-Feed hole; 1021-Slurry inlet; 1022-Filling chamber; 103-Discharge port; 11-Cutting wall; 12-Dispersion stator; 120-Centrifugal dispersion chamber; 121-Dispersion teeth; 2-Mixing rotor; 21-Scraper; 22-Agitator blade; 3-Drive shaft; 31-Ceramic bushing; 4-Spiral conveyor blades; 5-Centrifugal impeller; 51-First blade; 52-Disc; 53-Second blade; 54-Third blade; 6-Mechanical seal assembly; 61-Mechanical seal housing; 610-Pressure chamber; 611-Perforation; 62-Sealing sleeve; 621-Frame; 6211-Support wall; 6212-Mounting plate; 6213-Clamp; 6214-Annular clamp; 622-Annular sealing sheet; 63-Mounting groove; 64-Cover plate; 7-Boosting impeller; 71-Annular disc; 72-Columnar teeth; 8-Base. Detailed Implementation

[0018] Combination Figures 1 to 3 A precipitation machine for preparing aramid fibers is shown, comprising: a mixing chamber 10, a coagulant channel 101, and a slurry conveying channel 102, wherein the coagulant channel 101 and the slurry conveying channel 102 are connected to the mixing chamber 10; the slurry conveying channel 102 includes a set of feed holes 1020 arranged in an array along the extending direction of the mixing chamber 10, and the feed holes 1020 are disposed on the side wall of the mixing chamber 10; It also includes: a mixing rotor 2 rotatably disposed in the mixing chamber 10, wherein the mixing rotor 2 is provided with a scraper 21 at its radially outer end, the scraper 21 being used to scrape off the slurry entering the mixing chamber 10 from the feed hole 1020; and a stirring blade 22 is provided on the inner side of the scraper 21. The driving device includes a drive shaft 3 connected to the mixing rotor 2; The discharge port 103 is located on the mixing chamber 10 at the end away from the coagulant flow channel 101.

[0019] Based on the above apparatus, this embodiment proposes a method for the precipitation of aramid fibers, comprising the following steps: S1: The coagulant and aramid fiber slurry are fed into the mixing chamber 10 from the coagulant channel 101 and the slurry conveying channel 102 respectively in a preset volume ratio; in this embodiment, the volume ratio of the coagulant to the aramid fiber slurry is 1:6 or 1:7. The coagulant consists of water and DMAC.

[0020] S2: Rotate the mixing rotor 2, scrape the aramid fiber slurry squeezed into the feed hole 1020 through the scraper head 21, and mix the aramid fiber slurry into the coagulant by the stirring blade 22. S3: The mixed slurry is discharged from the outlet 103 and collected.

[0021] This application discloses a sedimentation machine for aramid fiber preparation. A coagulant channel 101 and a slurry conveying channel 102 are used to convey the coagulant and aramid fiber slurry to a mixing chamber 10, respectively. A set of feed holes 1020 are used to disperse the aramid fiber slurry conveyed to the mixing chamber 10. A drive shaft 3 drives a mixing rotor 2 to rotate. During the rotation of the mixing rotor 2, a scraper 21 is used to scrape off and separate the aramid fiber slurry squeezed into the mixing chamber 10 from the feed holes 1020. A stirring blade 22 is used to uniformly disperse the separated aramid fiber slurry within the coagulant, forming a diffused mixture. Finally, the liquid in the mixing chamber 10 is discharged and collected from the outlet 103. Therefore, this sedimentation machine for aramid fiber preparation can improve dispersion efficiency, precipitate downy short fibers, improve the uniformity of the fiber slurry after the sedimentation process, and effectively avoid the formation of large agglomerates.

[0022] In this embodiment, the mixing chamber 10 extends axially along the drive shaft 3, the coagulant channel 101 is located at one end of the mixing chamber 10, and the slurry conveying channel 102 is located on the side of the mixing chamber 10 in the extending direction. Specifically, the mixing chamber 10 is cylindrical in shape.

[0023] Combination Figure 4 As shown, this embodiment also includes a spiral conveying blade 4, which is coaxially mounted on the drive shaft 3 with the mixing rotor 2. The conveying chamber of the spiral conveying blade 4 connects the coagulant channel 101 and the mixing chamber 10. The spiral conveying blade 4 offers the advantage of stable material conveying. In this embodiment, the spiral conveying blade 4 extends spirally along the axial direction of the drive shaft 3 to the bottom of the mixing chamber 10. The mixing rotor 2 is integrated onto the spiral conveying blade 4, and the scraper head 21 and stirring blade 22 are disposed on the spiral conveying blade 4. Because the spiral conveying blade 4 extends into the mixing chamber 10, it improves the stability of the liquid flow within the mixing chamber 10 and extends the conveying channel within the mixing chamber 10, ensuring that the slurry is fully dispersed in the coagulant and improving the stability of the fiber slurry conveying within the mixing chamber 10, preventing agglomeration during stirring. In this embodiment, the scraper head 21 and stirring blade 22 are integrated, with the scraper head 21 disposed at the radially outer end of the stirring blade 22. The scraper head 21 and the spiral conveying blade 4 have the same radial dimension. It should be noted that there is a gap between the stirring blade 22 and the spiral conveying blade 4 to avoid completely blocking the conveying cavity of the spiral conveying blade 4.

[0024] In other embodiments, combined with Figures 10 to 12 The precipitator shown is used for the preparation of aramid fibers. The spiral conveying blade 4 and the mixing rotor 2 are axially separated, with the spiral conveying blade 4 installed above the mixing rotor 2.

[0025] Combination Figure 3As shown, in this embodiment, a housing 1 is also included. A coagulant channel 101 is disposed on the housing 1. A cutting wall 11 is provided inside the housing 1. The slurry conveying channel 102 also includes a slurry inlet 1021 and a filling chamber 1022. The slurry inlet 1021 is disposed on the housing 1. The filling chamber 1022 is disposed between the housing 1 and the cutting wall 11. A feed hole 1020 is disposed on the cutting wall 11.

[0026] Aramid fiber slurry enters through slurry inlet 1021, fills the filling chamber 1022, and is then extruded into the mixing chamber 10 through feed holes 1020. The filling chamber 1022 is used to ensure that the aramid fiber slurry is evenly distributed outside each feed hole 1020, thereby improving the uniformity of the aramid fiber slurry extruded into the mixing chamber 10. In this embodiment, the cutting wall 11 is an annular structure, the filling chamber 1022 surrounds the outside of the cutting wall 11, the feed holes 1020 are arranged in a circumferential array on the cutting wall 11, and the number of slurry inlets 1021 is 4, evenly spaced circumferentially.

[0027] Combination Figure 2 and Figure 5 As shown, in this embodiment, the bottom of the mixing chamber 10 is provided with a dispersing stator 12. The dispersing stator 12 includes a set of dispersing teeth 121 arranged in a circumferential array. Flow gaps are provided between adjacent dispersing teeth 121. A centrifugal dispersing chamber 120 is provided inside the dispersing teeth 121 and is connected to the mixing chamber 10. A centrifugal impeller 5 is provided inside the centrifugal dispersing chamber 120 and is mounted on the drive shaft 3. The fiber slurry mixed in the mixing chamber 10 enters the centrifugal dispersing chamber 120 and is discharged through the centrifugal impeller 5. During this process, the fiber slurry passes through the dispersing teeth 121 and flows out from the flow gaps between the dispersing teeth 121, further improving the uniformity of slurry dispersion. In this embodiment, the dispersing stator 12 is annular.

[0028] Combination Figure 7 As shown, in one embodiment, the centrifugal impeller 5 includes a disc 52 mounted on the drive shaft 3, the disc 52 corresponding to the axial end of the centrifugal dispersion chamber 120, and a first blade 51 disposed on the disc 52, the first blade 51 being disposed inside the centrifugal dispersion chamber 120; the centrifugal impeller 5 includes a third blade 54, the third blade 54 being disposed at the end of the disc 52 away from the first blade 51, and the discharge port 103 being disposed radially outside the third blade 54. Further, in this embodiment, combined with... Figure 6 As shown, the wheel 52 has a second blade 53 radially outside the first blade 51, and the second blade 53 is radially outside the dispersing teeth 121. In this embodiment, the fiber slurry in the centrifugal dispersion chamber 120 is discharged from the outlet 103 through the first blade 51, the second blade 53 and the third blade 54 in sequence, to prevent the slurry from being too viscous and stagnant. The first blade 51, the second blade 53 and the third blade 54 are integrated on the wheel 52, which has a high degree of integration and can save space.

[0029] Combination Figure 2 Figure 8 and 9 As shown, this embodiment also includes a mechanical sealing assembly 6, which comprises: Mechanical seal housing 61, which is installed at the end of housing 1, and drive shaft 3 passes through mechanical seal housing 61; The sealing sleeve 62 includes a frame 621 mounted on the mechanical seal housing 61, and an annular sealing sheet 622 is provided on the frame 621. The inner edge of the annular sealing sheet 622 abuts against the side wall of the drive shaft 3. The mechanical seal housing 61 is provided with a pressure boosting chamber 610, which is located on the axial outer side of the sealing sleeve 62. A flow channel is connected between the pressure boosting chamber 610 and the sealing sleeve 62. A pressure boosting impeller 7 is provided inside the pressure boosting chamber 610, and the pressure boosting impeller 7 is mounted on the drive shaft 3.

[0030] A radial seal is achieved between the drive shaft and the mechanical seal housing using an annular sealing plate to prevent liquid leakage from the housing 1. During operation, excessive pressure within the housing 1 can cause deformation of the annular sealing plate due to pressure on one side, leading to seal failure. This application discloses a liquid transfer pump where, during operation, the drive shaft drives a booster impeller to rotate synchronously, increasing the air pressure within the booster chamber to balance the pressure within the housing 1. This prevents the annular sealing plate from deforming due to excessive pressure within the housing 1, thus preventing liquid leakage. Compared to traditional mechanical seals, this design offers the advantages of lower cost while maintaining reliability.

[0031] In this embodiment, the frame 621 is a circumferentially closed annular shell, including a support wall 6211 and an integrally disposed mounting plate 6212 at the end of the support wall 6211. The end of the frame 621 away from the mounting plate 6212 is open, and the annular sealing piece 622 is fixed to the axial inner side of the mounting plate 6212. The mechanical seal housing 61 has an axially inner end with a mounting groove 63 that conforms to the shape of the frame 621. The frame 621 is installed in the mounting groove 63, which is connected to the pressurization chamber 610. Furthermore, the frame 621 includes a clamp 6213 fixed to the inner side of the support wall 6211. An annular clamping plate 6214 is integrally provided at one end of the clamp 6213 near the mounting plate 6212, and an annular sealing sheet 622 is disposed between the annular clamping plate 6214 and the mounting plate 6212.

[0032] In this embodiment, the pressurizing chamber 610 is located at the axial outer end of the mechanical seal housing 61. The axial outer end of the pressurizing chamber 610 is open. The pressurizing chamber 610 and the mounting groove 63 are axially connected by a through hole 611. The drive shaft 3 passes through the through hole 611. A gap is provided between the drive shaft 3 and the side wall of the through hole 611, corresponding to the flow channel of the pressurizing chamber 610 and the sealing sleeve 62. The gap size is 1mm.

[0033] In addition, the mechanical seal assembly 6 also includes a cover plate 64 covering the opening end of the pressurization chamber 610, through which the drive shaft 3 passes. The radial clearance between the drive shaft 3 and the cover plate 64 is 1 mm.

[0034] In this embodiment, the drive shaft 3 includes a ceramic bushing 31 sleeved on its outer side, and the inner edge of the annular sealing plate 622 abuts against the side wall of the ceramic bushing 31. During installation, the mechanical seal housing 61 is first sleeved onto the drive shaft 3, and then the ceramic bushing 31 sleeved on the drive shaft 3 is passed through the sealing sleeve 62 from top to bottom, causing the inner edge of the annular sealing plate 622 to deform downwards. This reduces the contact area between the annular sealing plate 622 and the liquid inside the housing 1, thus improving the service life of the annular sealing plate 622. The ceramic bushing 31 also has the advantages of a smooth surface and good wear resistance.

[0035] In addition, the mechanical seal housing 61 is connected to a base 8 at its outer axial end, and the drive shaft 3 is rotatably mounted on the base 8.

[0036] In this embodiment, the booster impeller 7 includes an annular disc 71 sleeved and mounted on the drive shaft 3. A set of columnar protrusions 72 are integrally formed at one end of the annular disc 71 away from the booster cavity 610, and these columnar protrusions 72 are arranged at equal intervals along their circumference. The booster cavity 610 is cylindrical, and the lateral and axial clearances between the booster impeller 7 and the booster cavity 610 are 1 mm.

[0037] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A precipitation machine for the preparation of aramid fibers, comprising: The mixing chamber (10), the coagulant channel (101), and the slurry conveying channel (102) are connected to the mixing chamber (10). Its features are, The slurry conveying channel (102) includes a set of arrayed feed holes (1020), which are disposed on the side wall of the mixing chamber (10); Also includes: A mixing rotor (2) is rotated inside the mixing chamber (10). The mixing rotor (2) is provided with a scraper (21) at its radial outer end. The scraper (21) is used to scrape off the slurry that enters the mixing chamber (10) from the feed hole (1020). A stirring blade (22) is provided on the inner side of the scraper (21). The drive device includes a drive shaft (3) connected to the mixing rotor (2). The discharge port (103) is provided on the mixing chamber (10); It also includes a spiral conveying blade (4), which is coaxially placed on the drive shaft (3) with the mixing rotor (2). The conveying chamber of the spiral conveying blade (4) is connected to the coagulant flow channel (101) and the mixing chamber (10). The spiral conveying blade (4) extends spirally along the axial direction of the drive shaft (3) to the bottom of the mixing chamber (10), the mixing rotor (2) is integrated on the spiral conveying blade (4), and the scraper (21) and stirring blade (22) are arranged on the spiral conveying blade (4). The scraper (21) and the stirring blade (22) are integrated into one unit, and the scraper (21) is located at the radial outer end of the stirring blade (22); It also includes a mechanical sealing assembly (6), which comprises: Mechanical seal housing (61), the mechanical seal housing (61) is installed at the end of housing (1), and drive shaft (3) passes through mechanical seal housing (61). The sealing sleeve (62) includes a frame (621) mounted on the mechanical seal housing (61), and an annular sealing plate (622) is provided on the frame (621). The inner edge of the annular sealing plate (622) abuts against the side wall of the drive shaft (3). The mechanical seal housing (61) is provided with a pressure chamber (610), which is located on the outer side of the sealing sleeve (62) in the axial direction. A flow channel is connected between the pressure chamber (610) and the sealing sleeve (62). A pressure impeller (7) is provided inside the pressure chamber (610), and the pressure impeller (7) is mounted on the drive shaft (3).

2. The precipitation machine for preparing aramid fibers according to claim 1, characterized in that: It also includes a shell (1), a coagulant channel (101) is provided on the shell (1), a cutting wall (11) is provided inside the shell (1), and a slurry conveying channel (102) also includes a slurry inlet (1021) and a filling chamber (1022). The slurry inlet (1021) is provided on the shell (1), the filling chamber (1022) is provided between the shell (1) and the cutting wall (11), and the feed hole (1020) is provided on the cutting wall (11).

3. The precipitation machine for preparing aramid fibers according to claim 1, characterized in that: The bottom of the mixing chamber (10) is provided with a dispersing stator (12), which includes a set of dispersing teeth (121) arranged in a circumferential array. A flow gap is provided between adjacent dispersing teeth (121). A centrifugal dispersing chamber (120) is provided inside the dispersing teeth (121). The centrifugal dispersing chamber (120) is connected to the mixing chamber (10). A centrifugal impeller (5) is provided inside the centrifugal dispersing chamber (120). The centrifugal impeller (5) is mounted on the drive shaft (3).

4. A precipitation machine for preparing aramid fibers according to claim 3, characterized in that: The centrifugal impeller (5) includes a disc (52) mounted on the drive shaft (3). The disc (52) corresponds to the axial end of the centrifugal dispersion chamber (120). The disc (52) is provided with a first blade (51), which is located inside the centrifugal dispersion chamber (120).

5. A precipitation machine for preparing aramid fibers according to claim 4, characterized in that: The centrifugal impeller (5) includes a third blade (54), which is located at the end of the impeller (52) away from the first blade (51), and the discharge port (103) is located on the radial outer side of the third blade (54).

6. A method for precipitation of aramid fibers, based on a precipitation machine for the preparation of aramid fibers as described in claim 1, characterized in that, Includes the following steps: S1: The coagulant and aramid fiber slurry are fed into the mixing chamber (10) from the coagulant channel (101) and the slurry conveying channel (102) respectively in a preset volume ratio. S2: Rotate the mixing rotor (2) and scrape the aramid fiber slurry squeezed into the feed hole (1020) through the scraper (21). The stirring blade (22) mixes the aramid fiber slurry into the coagulant. S3: The mixed slurry is discharged from the outlet (103) and collected.

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