Dry-jet wet-spun large tow polyacrylonitrile-based filament yarn combining device and preparation method

Abstract

The present application relates to carbon fiber precursor production technical field, specifically relates to a kind of dry spraying wet spinning polypropylene acrylonitrile-based large tow precursor yarn combining device and preparation method.The device includes movable yarn combining wheel combination device, spreader, fixed yarn combining wheel, guide roller group.At the two sides of yarn combining device, two silk respectively with perpendicular way to two movable yarn combining wheels, after yarn combining angle adjustment, form the same spread width at two spreaders, then four silk form interlacing point at two fixed yarn combining wheels, and combine into one large tow precursor yarn.After two guide rollers of guide roller group one, silk path is folded interlaced, after again silk path, silk bundle forms interlacing point again at two fixed yarn combining wheels, again silk path is folded after guide roller group two, and large tow precursor yarn is obtained after increasing interlacing degree.The present application realizes the yarn combining of dry spraying wet spinning polypropylene acrylonitrile-based large tow precursor yarn, and the interlacing of large tow precursor yarn obtained is good, and it is not easy to disperse in subsequent carbonization process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber precursor production, in particular to a dry-jet wet spinning large tow polyacrylonitrile-based precursor yarn combining device and preparation method. BACKGROUND

[0002] Carbon fiber is a special fiber with a carbon content of more than 90%, which has many excellent properties such as high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, electrical conductivity, heat conduction, and small thermal expansion coefficient, and is widely used in aerospace, sports, pressure vessels, building reinforcement, wind power blades, new energy vehicles, rail transportation and other modern emerging industries.

[0003] At present, the production of small tow carbon fiber is mainly in the world, and the large tow technology is mature in wet spinning. In the face of the rapidly developing market environment, the low cost of the production process is more and more valued, and the dry-jet wet spinning technology and the large tow fiber preparation technology have become the mainstream of low-cost production technology and have attracted widespread attention. However, the problem of dry-jet wet spinning large tow technology has not been solved, and the spun large tow precursor yarn is easy to disperse, and the combining effect is not ideal. SUMMARY

[0004] In order to solve the above-mentioned problem of dispersion of the precursor yarn after combining, the present application aims to provide a dry-jet wet spinning large tow polyacrylonitrile-based precursor yarn combining device and preparation method, which uses a combining device that can change the combining angle to perform multiple interlacing, realizing high-quality production of large tow precursor yarn.

[0005] In order to achieve the above-mentioned purpose, the technical method adopted by the present application is as follows:

[0006] A dry-jet wet spinning large tow polyacrylonitrile-based precursor yarn combining device, comprising a movable combining wheel set, an unwinding wheel, a fixed combining wheel, and a guide roller set.

[0007] The movable combining wheel set comprises a movable combining wheel, a combining wheel moving groove, and a movable bolt.

[0008] The movable combining wheel set is connected to the unwinding wheel set I, which is used to lay flat the precursor yarn after combining.

[0009] The fixed combining wheel I and the fixed combining wheel II are connected to the unwinding wheel set I.

[0010] The fixed combining wheel I and the fixed combining wheel II are connected to a set of guide roller set I arranged in the middle of the combining device.

[0011] The guide roller set I is connected to the unwinding wheel set II arranged on one side, which is used to fold and interlace the precursor yarn again for laying flat.

[0012] The fixed yarn combining wheel three and the fixed yarn combining wheel four are connected with the guide roller group two.

[0013] Further, the guide roller group comprises a guide roller group fixing bolt, a guide roller fixing bolt and a guide roller group. The guide roller group is fixed on the yarn combining device through the guide roller group fixing bolt, and the guide roller is fixed on the guide roller device through the guide roller fixing bolt.

[0014] Further, the yarn combining wheel moving bracket has a length of 30-50 cm, and the movable yarn combining wheel can be driven to move left and right through the left and right moving bolts, so as to change the yarn combining angle.

[0015] Further, the yarn combining wheel moving bracket is provided with scales, and different scales correspond to different yarn combining angles.

[0016] Further, the yarn spreading wheel is fixed on the yarn combining device through a yarn spreading wheel fixing nut.

[0017] Further, the movable yarn combining wheel group has two movable yarn combining wheels on each side with the center line of the yarn combining device as the reference.

[0018] A dry-jet wet-spun large-tow polyacrylonitrile-based precursor filament preparation method, the specific steps are:

[0019] On one side of the yarn combining device, two yarns are adjusted in the yarn combining angle through the movable yarn combining wheel one and the movable yarn combining wheel two, and then are flattened through the yarn spreading wheel four and the yarn spreading wheel two to form the same spreading width, which is 3-5 mm. Similarly, on the other side of the yarn combining device, two yarns are also adjusted in the yarn combining angle through the movable yarn combining wheel three and the movable yarn combining wheel four, and then are flattened through the yarn spreading wheel three and the yarn spreading wheel one to form the same spreading width, which is also 3-5 mm. Then the four yarns form interlacing points through the fixed yarn combining wheel one and the fixed yarn combining wheel two, and are combined into one large-tow precursor filament.

[0020] The two guide rollers of the guide roller group one fold the yarn path.

[0021] The tow is sent to the zigzag yarn path composed of the yarn spreading wheel five, the yarn spreading wheel six and the yarn spreading wheel seven, and the yarn path is deviated from the center line by an angle of 15-45°.

[0022] After passing through the zigzag yarn path, the tow forms interlacing points again through the fixed yarn combining wheel three and the fixed yarn combining wheel four, and the yarn path is folded again through the guide roller group two to increase the interlacing degree, so that the large-tow precursor filament is obtained.

[0023] Further, the tow is in a vertical manner to the movable yarn combining wheel.

[0024] Further, the yarn combining angle is 15-75°.

[0025] Further, the four yarn combining angles, i.e. the angles at which the four yarns respectively enter the first set of yarn spreading wheels, are kept consistent in size, and the yarn combining effect is the best.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] The present application adopts a mobile yarn combining wheel device, and can prepare large-tow raw yarns.

[0028] The mobile yarn combining wheel device can adjust the yarn combining angle, and the prepared large-tow raw yarns have good interlacing property and are not easy to disperse in the subsequent carbonization process. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of a large-tow yarn combining device of the present application.

[0030] In the figure: 1 - yarn; 2 - mobile yarn combining wheel set; 201 - yarn combining wheel mobile holder; 202 - mobile bolt; 203 - mobile yarn combining wheel one; 204 - mobile yarn combining wheel two; 205 - mobile yarn combining wheel three; 206 - mobile yarn combining wheel four; 207 - yarn combining angle; 3 - yarn spreading wheel fixing nut; 4 - yarn spreading wheel one; 5 - yarn spreading wheel two; 6 - yarn spreading wheel three; 7 - yarn spreading wheel four; 8 - fixed yarn combining wheel one; 9 - fixed yarn combining wheel two; 10 - yarn guide roller set one; 1001 - yarn guide roller; 1002 - yarn guide roller fixing bolt; 1003 - yarn guide roller set fixing bolt; 11 - yarn spreading wheel five; 12 - yarn spreading wheel six; 13 - yarn spreading wheel seven; 14 - fixed yarn combining wheel three; 15 - fixed yarn combining wheel four; 16 - yarn guide roller set two; 1601 - yarn guide roller two. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0032] As Figure 1The application discloses a dry-jet wet-spun large-bundle polyacrylonitrile-based filament yarn combining device, which comprises a movable combining wheel set 2, spreader wheels 4-7, 11-13, fixed combining wheels 8, 9, 14, 15, guide roller sets 10, 16. The movable combining wheel set 2 comprises movable combining wheels 203-206, a movable combining wheel moving support groove 201 and movable bolts 202. The guide roller sets 10, 16 are fixed on the combining device through guide roller set fixing bolts 1003, and the guide rollers 1001 are fixed on the guide roller sets 10, 16 through guide roller fixing bolts 1002. The spreader wheels 4-7, 11-13 are fixed on the combining device through spreader wheel fixing nuts 3. The movable combining wheel moving support groove 201 has a length of 30-50 cm, and the movable combining wheels 203-206 can be moved left and right to change the combining angle 207 through the left and right movable bolts 202. The movable combining wheel moving support groove 201 is provided with scales, and different scales correspond to different combining angles 207. The movable combining wheel set 2 is arranged on the center line of the combining device as a reference, and two movable combining wheels 203-204 and 205-206 are arranged on the left and right sides of the center line.

[0033] The application further discloses a dry-jet wet-spun large-bundle polyacrylonitrile-based filament yarn preparation method.

[0034] On one side of the combining device, two bundles of yarns are respectively arranged to the movable combining wheel one 203 and the movable combining wheel two 204 in a vertical manner, the combining angle 207 is adjusted, the yarns are flattened through the spreader wheel four 7 and the spreader wheel two 5, and the same spread width is formed, and the width is 3-5 mm. Similarly, on the other side of the combining device, two bundles of yarns are respectively arranged to the movable combining wheel three 205 and the movable combining wheel four 206, the combining angle 207 is adjusted, the yarns are flattened through the spreader wheel three 6 and the spreader wheel one 4, and the same spread width is formed, and the width is 3-5 mm. Then the four bundles of yarns form interlacing points at the fixed combining wheel one 8 and the fixed combining wheel two 9, and are combined into one bundle of large-bundle filament yarn.

[0035] The yarns pass through two guide rollers of the guide roller set one 10, and the yarn path is folded and interlaced.

[0036] The yarns are sent to a zigzag yarn path formed by the spreader wheel five 11, the spreader wheel six 12 and the spreader wheel seven 13, and the yarn path is deviated from the center line by an angle of 15-45°.

[0037] After passing through the zigzag yarn path, the yarns form interlacing points at the fixed combining wheel three 14 and the fixed combining wheel four 15 again, pass through the guide roller set two 1601 again to fold the yarn path, and then the interlacing degree is increased to obtain the large-bundle filament yarn. Embodiment

[0038] The yarn combining device comprises a movable yarn combining wheel set 2, yarn spreading wheels 4-7, 11-13, fixed yarn combining wheels 8, 9, 14, 15, a yarn guide roller set 10, 16. The movable yarn combining wheel set 2 comprises movable yarn combining wheels 203-206, a yarn combining wheel movable holder 201, a movable bolt 202. The yarn guide roller set 10, 16 comprises a yarn guide roller set fixing bolt 1003, a yarn guide roller fixing bolt 1002, yarn guide rollers 1001. The yarn guide roller set 10, 16 is fixed to the yarn combining device by the yarn guide roller set fixing bolt 1003, the yarn guide rollers 1001 are fixed to the yarn guide roller set 10, 16 by the yarn guide roller fixing bolt 1002, and the yarn spreading wheels 4-7, 11-13 are fixed to the yarn combining device by the yarn spreading wheel fixing nut 3.

[0039] On one side of the yarn combining device, two yarns are respectively fed to the movable yarn combining wheel one 203 and the movable yarn combining wheel two 204 in a perpendicular manner. The length of the yarn combining wheel movable holder is 50 cm, the movable bolt is to the 50 cm position, the yarn combining angles 207 on both sides are adjusted to 15°, and then the yarns are flattened at the yarn spreading wheel four 7 and the yarn spreading wheel two 5 to form the same spreading width, which is 3 mm. Similarly, on the other side of the yarn combining device, two yarns are respectively fed to the movable yarn combining wheel three 205 and the movable yarn combining wheel four 206, the yarn combining angles 207 are adjusted to 15°, and then the yarns are flattened at the yarn spreading wheel three 6 and the yarn spreading wheel one 4 to form the same spreading width, which is also 3 mm. Then the four yarns form intersection points at the fixed yarn combining wheel one 8 and the fixed yarn combining wheel two 9 to combine into one large yarn bundle.

[0040] The yarn bundle is fed to the folded yarn path composed of the yarn spreading wheel five 11, the yarn spreading wheel six 12, and the yarn spreading wheel seven 13, and the yarn path is deviated from the center line by an angle of 30°. After passing through the folded yarn path, the yarn bundle forms intersection points again at the fixed yarn combining wheel three 14 and the fixed yarn combining wheel four 15, and the yarn path is folded again by the two yarn guide rollers of the yarn guide roller set two 1601 to increase the intersection degree, and then a large yarn bundle is obtained. Embodiment

[0041] The yarn combining device comprises a movable yarn combining wheel set 2, yarn spreading wheels 4-7, 11-13, fixed yarn combining wheels 8, 9, 14, 15, a yarn guide roller set 10, 16. The movable yarn combining wheel set 2 comprises movable yarn combining wheels 203-206, a yarn combining wheel movable holder 201, a movable bolt 202. The yarn guide roller set 10, 16 comprises a yarn guide roller set fixing bolt 1003, a yarn guide roller fixing bolt 1002, yarn guide rollers 1001. The yarn guide roller set 10, 16 is fixed to the yarn combining device by the yarn guide roller set fixing bolt 1003, the yarn guide rollers 1001 are fixed to the yarn guide roller set 10, 16 by the yarn guide roller fixing bolt 1002, and the yarn spreading wheels 4-7, 11-13 are fixed to the yarn combining device by the yarn spreading wheel fixing nut 3.

[0042] On the side of the silk combining device, two bundles of silk respectively pass through the mobile silk combining wheel 1 203 and the mobile silk combining wheel 2 204 in a perpendicular manner, the length of the mobile silk combining wheel moving groove is 40 cm, the length of the mobile silk combining wheel moving bolt is 20 cm, the silk combining angles 207 on both sides are adjusted to 30°, then the silk is flattened through the silk spreading wheel 4 7 and the silk spreading wheel 2 5, and the same spreading width is formed, which is 4 mm. Similarly, on the other side of the silk combining device, two bundles of silk respectively pass through the mobile silk combining wheel 3 205 and the mobile silk combining wheel 4 206, the silk combining angles 207 are adjusted to 15°, then the silk is flattened through the silk spreading wheel 3 6 and the silk spreading wheel 1 4, and the spreading width is also 4 mm. Then the four bundles of silk form intersection points at the fixed silk combining wheel 1 8 and the fixed silk combining wheel 2 9, and are combined into one bundle of large bundle of original silk. The silk path is folded and intersected through the two guide rollers of the guide roller set 1 10.

[0043] The bundle of silk is sent to the folded silk path composed of the silk spreading wheel 5 1 1, the silk spreading wheel 6 1 2, and the silk spreading wheel 7 1 3, and the silk path is deviated from the center line by an angle of 35°. After passing through the folded silk path, the bundle of silk forms intersection points again at the fixed silk combining wheel 3 1 4 and the fixed silk combining wheel 4 1 5, and is folded again through the guide roller 2 1 601, so that the intersection degree is increased, and a large bundle of original silk is obtained. Embodiment

[0044] The silk combining device comprises a mobile silk combining wheel set 2, silk spreading wheels 4-7, 1 1 -1 3, fixed silk combining wheels 8, 9, 1 4, 1 5, guide roller devices 1 0, 1 6. The mobile silk combining wheel set 2 comprises mobile silk combining wheels 203-206, a silk combining wheel moving groove 201, and a mobile silk combining wheel moving bolt 202. The guide roller set 1 0, 1 6 comprises a guide roller set fixing bolt 1 003, a guide roller fixing bolt 1 002, and guide rollers 1 001. The guide roller set 1 0, 1 6 is fixed on the silk combining device through the guide roller set fixing bolt 1 003, the guide rollers 1 001 are fixed on the guide roller set 1 0, 1 6 through the guide roller fixing bolt 1 002, and the silk spreading wheels 4-7, 1 1 -1 3 are fixed on the silk combining device through the silk spreading wheel fixing nut 3.

[0045] On the side of the yarn combining device, two yarns are respectively combined at the mobile yarn combining wheel 1 203 and the mobile yarn combining wheel 2 204 in a perpendicular manner, the length of the mobile yarn combining wheel moving groove is 50 cm, the mobile bolt is 5 cm, the yarn combining angles 207 on both sides are adjusted to 75°, then the yarns are flattened at the spreader wheel 4 7 and the spreader wheel 2 5, and the same spread width is formed, which is 3 mm. Similarly, on the other side of the yarn combining device, two yarns are respectively combined at the mobile yarn combining wheel 3 205 and the mobile yarn combining wheel 4 206, the yarn combining angles 207 are adjusted to 75°, then the yarns are flattened at the spreader wheel 3 6 and the spreader wheel 1 4, and the spread width is also 3 mm. Then the four yarns form intersection points at the fixed yarn combining wheel 1 8 and the fixed yarn combining wheel 2 9, and are combined into one large yarn bundle. After passing through the two guide rollers of the guide roller set 1 10, the yarn path is folded and interlaced.

[0046] The yarn bundle is sent to the folded yarn path composed of the spreader wheel 5 11, the spreader wheel 6 12, and the spreader wheel 7 13, and the yarn path is deviated from the center line by an angle of 20°. After passing through the folded yarn path, the yarn bundle forms intersection points again at the fixed yarn combining wheel 3 14 and the fixed yarn combining wheel 4 15, and the yarn path is folded again by the guide roller 2 1601, and the large yarn bundle is obtained after increasing the interlacing degree.

[0047] Comparative Example 1

[0048] The yarn combining device comprises a mobile yarn combining wheel set 2, spreader wheels 4-7, 11-13, fixed yarn combining wheels 8, 9, 14, 15, guide roller devices 10, 16. The mobile yarn combining wheel set 2 comprises mobile yarn combining wheels 203-206, a yarn combining wheel moving groove 201, and a mobile bolt 202. The guide roller set 10, 16 comprises a guide roller set fixing bolt 1003, a guide roller fixing bolt 1002, and a guide roller set 1001. The guide roller set 10, 16 is fixed on the yarn combining device by the guide roller set fixing bolt 1003, the guide roller set 1001 is fixed on the guide roller set 10, 16 by the guide roller fixing bolt 1002, and the spreader wheels 4-7, 11-13 are fixed on the yarn combining device by the spreader wheel fixing nut 3.

[0049] On the side of the yarn combining device, two yarns are respectively combined to the moving yarn combining wheel 1 203 and the moving yarn combining wheel 2 204 in a perpendicular manner, the moving support slot length of the yarn combining wheel is 40 cm, the moving bolt is to 20 cm, the yarn combining angles 207 of both sides are adjusted to 30°, then the yarns are flattened through the spreader wheel 4 7 and the spreader wheel 2 5, and the same spread width is formed, which is 4 mm. Similarly, on the other side of the yarn combining device, two yarns are respectively combined to the moving yarn combining wheel 3 205 and the moving yarn combining wheel 4 206, the yarn combining angles 207 are adjusted to 65°, then the yarns are flattened through the spreader wheel 3 6 and the spreader wheel 1 4, and the spread width is also 4 mm. Then the four yarns form the interlacing point at the fixed yarn combining wheel 1 8 and the fixed yarn combining wheel 2 9, and are combined into one large yarn bundle. After passing through the two guide rollers of the guide roller set 1 10, the yarn path is folded and interlaced.

[0050] The yarn bundle is sent to the folded yarn path composed of the spreader wheel 5 1 1, the spreader wheel 6 1 2, and the spreader wheel 7 1 3, and the yarn path is deviated from the center line at an angle of 35°. After passing through the folded yarn path, the yarn bundle forms the interlacing point again at the fixed yarn combining wheel 3 1 4 and the fixed yarn combining wheel 4 1 5, and is folded again through the guide roller 2 1 601 to increase the interlacing degree, and then the large yarn bundle is obtained.

[0051] Comparative Example 2

[0052] The yarn combining device comprises the moving yarn combining wheel set 2, the spreader wheels 4-7, 1 1 -1 3, the fixed yarn combining wheels 8, 9, 1 4, 1 5, the guide roller device 1 0, 1 6. The moving yarn combining wheel set 2 comprises the moving yarn combining wheels 203-206, the yarn combining wheel moving support slot 201, and the moving bolt 202. The guide roller set 1 0, 1 6 comprises the guide roller set fixing bolt 1 003, the guide roller fixing bolt 1 002, and the guide roller set 1 001. The guide roller set 1 0, 1 6 is fixed to the yarn combining device through the guide roller set fixing bolt 1 003, the guide roller 1 001 is fixed to the guide roller set 1 0, 1 6 through the guide roller fixing bolt 1 002, and the spreader wheels 4-7, 1 1 -1 3 are fixed to the yarn combining device through the spreader wheel fixing nut 3.

[0053] On the side of the yarn combining device, two yarns are respectively fed to the movable yarn combining wheel 1 203 and the movable yarn combining wheel 2 204 in a perpendicular manner, the movable yarn combining wheel moving groove length is 40 cm, the movable bolt is 20 cm, the yarn combining angle 207 is adjusted to 30°, the other yarn combining angle 207 is adjusted to 65°, and then the yarns are flattened through the yarn spreading wheel 4 7 and the yarn spreading wheel 2 5 to form the same spreading width, which is 4 mm. Similarly, on the other side of the yarn combining device, two yarns are respectively fed to the movable yarn combining wheel 3 205 and the movable yarn combining wheel 4 206, one yarn combining angle 207 is adjusted to 30°, and the other yarn combining angle 207 is adjusted to 65°, and then the yarns are flattened through the yarn spreading wheel 3 6 and the yarn spreading wheel 1 4 to form the same spreading width, which is 4 mm. Then the four yarns form interlacing points at the fixed yarn combining wheel 1 8 and the fixed yarn combining wheel 2 9 to form a large bundle of raw yarns. The yarns pass through the two guide rollers of the guide roller set 1 10, and the yarn path is folded and interlaced.

[0054] The yarn bundle is sent to the folded yarn path composed of the yarn spreading wheel 5 1 1, the yarn spreading wheel 6 12, and the yarn spreading wheel 7 13, and the yarn path is deviated from the center line at an angle of 35°. After passing through the folded yarn path, the yarn bundle forms interlacing points again at the fixed yarn combining wheel 3 14 and the fixed yarn combining wheel 4 15, and the yarn path is folded again through the guide roller 2 1601 to increase the interlacing degree, and then a large bundle of raw yarns is obtained.

[0055] Comparative Example 3

[0056] The yarn combining device comprises a movable yarn combining wheel set 2, yarn spreading wheels 4-7, 1 1 -13, fixed yarn combining wheels 8, 9, 14, 15, guide roller devices 10, 16. The movable yarn combining wheel set 2 comprises movable yarn combining wheels 203-206, a yarn combining wheel moving groove 201, and a movable bolt 202. The guide roller set 10, 16 comprises a guide roller set fixing bolt 1003, a guide roller fixing bolt 1002, and a guide roller 1001. The guide roller set 10, 16 is fixed to the yarn combining device by the guide roller set fixing bolt 1003, the guide roller 1001 is fixed to the guide roller set 10, 16 by the guide roller fixing bolt 1002, and the yarn spreading wheels 4-7, 1 1 -13 are fixed to the yarn combining device by the yarn spreading wheel fixing nut 3.

[0057] On the side of the yarn combining device, two yarns are respectively arranged to the moving yarn combining wheel 1 203 and the moving yarn combining wheel 2 204 in a vertical manner, the moving support groove length of one yarn combining wheel is 40 cm, the moving bolt is arranged to 20 cm, the yarn combining angle 207 is adjusted to 30°, the yarn combining angle 207 of the other is adjusted to 65°, then the yarns are flattened through the spreader wheel 4 7 and the spreader wheel 2 5, and the same spread width is formed, the width is 4 mm. Similarly, on the other side of the yarn combining device, two yarns are respectively arranged to the moving yarn combining wheel 3 205 and the moving yarn combining wheel 4 206, the yarn combining angle 207 of one is adjusted to 20°, the yarn combining angle 207 of the other is adjusted to 45°, then the yarns are flattened through the spreader wheel 3 6 and the spreader wheel 1 4, and the spread width is also 4 mm. Then the four yarns form the interlacing point through the fixed yarn combining wheel 1 8 and the fixed yarn combining wheel 2 9, and are combined into one large yarn bundle.

[0058] The yarn bundle is sent to the folded yarn path composed of the spreader wheel 5 11, the spreader wheel 6 12 and the spreader wheel 7 13, and the yarn path is deviated from the center line at an angle of 35°. After passing through the folded yarn path, the yarn bundle forms the interlacing point again through the fixed yarn combining wheel 3 14 and the fixed yarn combining wheel 4 15, and the yarn path is folded again through the guide roller set 2 1601, and the large yarn bundle is obtained after increasing the interlacing degree.

[0059] The interlacing conditions and subsequent carbonization dispersion conditions of the large yarn bundles obtained in Examples 1-3 and Comparative Examples 1-3 are shown in Table 1.

[0060] Name Interlacing value Post-oxidation dispersion Example 1 15.3 No dispersion Example 2 14.1 No significant dispersion Example 3 15.1 No dispersion Comparative Example 1 7.8 Dispersion into two filaments Comparative Example 2 6.7 Dispersion into two filaments Comparative Example 3 5.1 Dispersion into four filaments

[0061] The remaining matters of the present application are the known technology.

[0062] The above examples and comparative examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A dry-jet-wet-spun large tow polyacrylonitrile-based filament combining device, characterized in that, Both sides of the combining device are provided with: a movable combining wheel set (2) for adjusting the combining angle; The combining angle is the angle at which a single filament enters the spreader wheel in the first spreader wheel set (4-7) from the movable combining wheel in the movable combining wheel set (2); the movable combining wheel set (2) is connected to the first spreader wheel set (4-7), which is used for laying the combined filaments flat; the first fixed combining wheel (8) and the second fixed combining wheel (9) are connected to the first spreader wheel set (4-7), which is used for the combined filaments to form interlacing points at this location after being laid flat; The first fixed combining wheel (8) and the second fixed combining wheel (9) are connected to a set of guide roller sets (10) arranged in the middle of the combining device, which are used for folding and interlacing the filaments; The guide roller set (10) is connected to a second spreader wheel set arranged on one side, which is used for laying the folded and interlaced filaments flat again; The second spreader wheel set is connected to the third fixed combining wheel (14) and the fourth fixed combining wheel (15) arranged on both sides, which are used for the filaments to form interlacing points again at this location after being laid flat; The third fixed combining wheel (14) and the fourth fixed combining wheel (15) are connected to the second guide roller set (16), which is used for folding the filaments again.

2. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining device according to claim 1, characterized in that, The movable combining wheel set (2) includes a plurality of movable combining wheels (203-206), a combining wheel moving holder (201), and a movable bolt (202); the movable combining wheels (203-206) are arranged in the combining wheel moving holder (201) through the movable bolt (202).

3. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining device according to claim 1, characterized in that, The guide roller set (10) and the second guide roller set (16) each include a guide roller set fixing bolt (1003), a guide roller fixing bolt (1002), and a guide roller (1001); the guide roller set (10) and the second guide roller set (16) are fixed to the combining device through the guide roller set fixing bolt (1003), and the guide roller (1001) is fixed to the guide roller set (10) and the second guide roller set (16) through the guide roller fixing bolt (1002).

4. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining device according to claim 2, characterized in that, The combining wheel moving holder (201) is 30-50 cm long, and the movable combining wheels (203-206) are moved left and right by the movable bolt (202), thereby changing the combining angle (207); the combining wheel moving holder (201) is provided with scales, and different scales correspond to different combining angles (207).

5. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining device according to claim 1, characterized in that, The first spreader wheel set (4-7) and the second spreader wheel set (11-13) are fixed to the combining device through a spreader wheel fixing nut (3).

6. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining device according to claim 1, characterized in that, The movable combining wheel set (2) is arranged on both sides of the center line of the combining device, and each side is provided with two groups of movable combining wheels (203-204) and (205-206).

7. A dry-jet wet spinning plexifilamentary polyacrylonitrile-based precursor filament yarning process based on any one of claims 1 to 6, characterized in that, The specific steps of the method are: On the side of the yarn combining device, two yarns are respectively adjusted by the movable yarn combining wheel one (203) and the movable yarn combining wheel two (204) to adjust the yarn combining angle (207), and then are flattened by the spreader four (7) and the spreader two (5) in the spreader group one to form the same spread width, which is 3-5mm; Similarly, on the other side of the yarn combining device, two yarns are respectively adjusted by the movable yarn combining wheel three (205) and the movable yarn combining wheel four (206) to adjust the yarn combining angle (207), and then are flattened by the spreader three (6) and the spreader one (4) to form the same spread width, which is also 3-5mm; then the four yarns form the interlacing point at the fixed yarn combining wheel one (8) and the fixed yarn combining wheel two (9) to form a large yarn bundle; The yarn path is folded and interlaced by the two guide rollers of the guide roller group one (10); The yarn bundle is sent to the folded yarn path composed of the spreader five (11), the spreader six (12), and the spreader seven (13), and the yarn path is deviated from the center line by an angle of 15-45°; After passing through the folded yarn path, the yarn bundle forms the interlacing point again at the fixed yarn combining wheel three (14) and the fixed yarn combining wheel four (15), and then is folded again by the guide roller group two (16) to increase the interlacing degree to obtain the large yarn bundle.

8. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining method according to claim 7, characterized in that, The four yarns are perpendicular to the movable yarn combining wheel (203-206), that is, the angle e is 90°.

9. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining method according to claim 7, characterized in that, The yarn combining angle (207) is 15-75°.

10. A dry-jet wet spinning large filament polyacrylonitrile-based precursor yarn combining method according to claim 7, characterized by, When the four yarn combining angles (207) are consistent, the yarn combining effect is the best.

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