Compound dry spinning channel

Abstract

The utility model discloses a compound dry spinning channel which comprises an upper channel and a lower channel which are in butt joint according to upper and lower positions, the upper channel comprises a plurality of small channels, the lower channel is a large channel, a channel connecting plate is arranged at the top of the large channel, and a plurality of small channels are arranged on the channel connecting plate. A plurality of channel butt joint holes are formed in the channel connecting plate, and the plurality of small channels are correspondingly mounted on the plurality of channel butt joint holes of the channel connecting plate; the top of the small channel is provided with a hot air assembly used for conveying hot air downwards into the small channel and a spinning assembly used for spraying spinning downwards into the small channel. According to the utility model, the yield of dry spinning and the spinning quality are improved.

Description

Technical Field

[0001] This utility model relates to the field of dry spinning technology, specifically to a compound dry spinning tunnel. Background Technology

[0002] Polyimide is a high-performance synthetic polymer with excellent thermal stability, mechanical strength, and chemical stability. Polyimide spinning refers to the process of manufacturing fibers using polyimide (PI) materials.

[0003] In existing technologies, there are typically two processes for polyimide spinning: wet spinning and dry spinning. Dry spinning is based on the technology used in spandex dry spinning. The specific process of dry spinning is as follows: a polyimide solution is extruded through a spinneret to form a fine stream. This stream enters the spinning tunnel, where high-temperature gas rapidly evaporates the solvent from the liquid stream, causing the filaments to solidify into fibers. The solidified fibers undergo bundling and oiling treatments to improve their strength and elasticity. Finally, the fibers are wound into a spindle, completing the entire spinning process.

[0004] A typical large-scale polyimide dry spinning channel in the existing technology is a circular channel, which adopts a channel structure basically the same as that of spandex dry spinning circular channels, and the spinneret structure is also similar to that of spandex. However, because spandex filaments are used in single-filament bundles, the PI fiber is limited by the channel design; its spinneret orifices are arranged near the outer circumference of the spinneret, making it unsuitable for producing large filament bundles. This results in low yield when used for polyimide production. Furthermore, the circumferentially distributed spinneret structure means all filaments are located within the same channel, making filament separation and bundling difficult. Moreover, when using a large channel for spinning, the filaments are easily disturbed by the hot airflow within the channel, affecting each other and leading to a decrease in spinning quality. Utility Model Content

[0005] To address the aforementioned problems, this utility model proposes a compound dry spinning channel, aiming to overcome the shortcomings of existing technologies and improve the output and quality of dry spinning. The specific technical solution is as follows:

[0006] A compound dry spinning duct includes an upper duct and a lower duct connected vertically. The upper duct includes a number of smaller ducts, and the lower duct is a larger duct. A duct connecting plate is provided at the top of the larger duct, and a number of duct docking holes are provided on the duct connecting plate. The number of smaller ducts are correspondingly installed on the number of duct docking holes on the duct connecting plate. The top of each smaller duct is provided with a hot air assembly for conveying hot air downward into the smaller duct and a spinneret assembly for spinning yarn downward into the smaller duct.

[0007] In this invention, the spinneret assembly is located at the center of the top of the small channel, and the hot air assembly is arranged around the spinneret assembly at the top of the small channel.

[0008] Preferably, the main passageway is a circular main passageway, and the small passageway is a circular small passageway.

[0009] Preferably, the number of the small passageways is no less than three.

[0010] In this invention, the hot air assembly includes a hot air seat fixed to the top of the small passageway, an annular groove disposed on the lower end face of the hot air seat, and an annular hot air distribution static pressure module disposed within the annular groove. An annular hot air space is provided between the bottom of the annular groove and the annular hot air distribution static pressure module. A hot air pipe is disposed on the upper end face of the hot air seat, and the hot air pipe extends downward into the annular hot air space. A hot air outlet is disposed at the end of the extension of the hot air pipe entering the annular hot air space. The hot air delivery direction of the hot air outlet of the hot air pipe is set to avoid the hot air blowing directly towards the annular hot air distribution static pressure module.

[0011] Preferably, a pair of hot air outlets are provided at the end of the extension of the hot air duct, and the hot air delivery direction of the pair of hot air outlets is consistent with the annular direction of the annular hot air space in the vertically downward projection direction and is located on both sides of the end of the extension of the hot air duct.

[0012] In this invention, the spinneret assembly includes a spinneret mounting base with an internal chamber, a spinneret mounted at the bottom of the internal chamber of the spinneret mounting base, a spinneret feed plate mounted at the upper part of the internal chamber of the spinneret mounting base, and a spinneret feed hole located at the center of the spinneret feed plate. The spinneret mounting base is provided with a spinneret uniform distribution device in the internal chamber located between the spinneret feed plate and the spinneret. The spinneret uniform distribution device includes an upper spinneret distribution plate and a lower spinneret distribution plate arranged at vertical intervals. The upper spinneret distribution plate is provided with a number of upper distribution holes for the spinneret (polyimide solution, i.e., PI solution) to pass through, and the lower spinneret distribution plate is provided with a number of lower distribution holes for the spinneret to pass through. The upper distribution holes and the lower distribution holes are staggered from each other in the vertically downward projection direction.

[0013] Preferably, the spinneret in the spinneret assembly is a multi-hole integrated spinneret, and multiple spinneret holes are arranged in a circumferential array on multiple concentric circles on the multi-hole integrated spinneret.

[0014] In this invention, a spinneret mounting hole is provided at the center of the hot air base, and the spinneret mounting seat is fixed in the spinneret mounting hole of the hot air base.

[0015] In this invention, an annular heat-insulating water channel is provided on the annular wall of the inner cavity outside the spinneret mounting base.

[0016] The beneficial effects of this utility model are:

[0017] First, the present invention provides a compound dry spinning channel structure, which adopts a compound spinning channel structure in which multiple small channels in the upper part are connected to a large channel in the lower part. By setting multiple small channels, on the one hand, the basic requirements of the overall output of polyimide spinning can be met, and on the other hand, the use of small channels can improve the efficiency of hot air evaporation of solvent in the raw solution, thereby accelerating the spinning speed and further improving the overall output of polyimide spinning.

[0018] Secondly, the compound dry spinning channel of this utility model, by setting multiple small channels, overcomes the drawback of conventional large channel spinning where the filaments are easily disturbed by the hot airflow inside the channel and thus affect each other, thereby improving the quality of polyimide spinning.

[0019] Third, the present invention provides a compound dry spinning channel in which each small circular channel can be installed on the large circular channel by means of flange or bolt connection, or it can be a welded structure as a whole, so as to achieve the purpose of convenient processing and installation.

[0020] Fourth, the present invention provides a compound dry spinning duct that greatly increases the number of spinnerets by setting a circumferential array of spinnerets on multiple concentric circles of a multi-hole integrated spinneret, thereby further increasing the overall output of polyimide spinning.

[0021] Fifth, this utility model provides a compound dry spinning channel, which, by setting up multiple small channels, allows the filaments produced by each small channel to be collected separately into a bundle (single), thereby overcoming the drawback of conventional polyimide spinning channels where the filaments are located in the same channel, which makes filament separation and bundling more troublesome.

[0022] Sixth, this utility model provides a compound dry spinning channel. In addition to polyimide (PI), the compound structure channel can also be used for fibers such as aramid 1313 (meta-aramid) that use solvents such as DMAC / DMSO to produce large tows. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a compound dry spinning tunnel according to this utility model;

[0024] Figure 2yes Figure 1 Top view;

[0025] Figure 3 yes Figure 1 A schematic diagram of the spinneret assembly in the diagram;

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure of the spinneret distribution plate in the middle;

[0027] Figure 5 yes Figure 4 A top view of the spinneret distribution plate;

[0028] Figure 6 yes Figure 3 A schematic diagram of the spinneret in the diagram (top view);

[0029] Figure 7 yes Figure 3 A cross-sectional view (top view) of the spinneret mounting base in the middle;

[0030] Figure 8 This is a three-dimensional structural diagram of the spinneret assembly.

[0031] Figure 9 yes Figure 1 A three-dimensional structural diagram of the hot air component in the middle;

[0032] Figure 10 yes Figure 10 A sectional view;

[0033] Figure 11 yes Figure 1 A sectional view.

[0034] In the diagram: 000, duplex dry spinning tunnel; 001, upper tunnel (small tunnel); 002, lower tunnel (large tunnel); 003, tunnel connecting plate; 004, tunnel docking hole.

[0035] In the diagram: 100, spinneret assembly; 101, spinneret mounting base; 102, spinneret; 103, spinneret feed plate; 104, spinneret feed hole; 105, spinneret uniform distribution device; 106, upper spinneret distribution plate; 107, lower spinneret distribution plate; 108, upper distribution hole; 109, lower distribution hole; 110, receiving tank; 111, pointed shape; 112, arc shape; 113, center position; 114, cavity; 115, spinneret filter screen; 116, annular septum; 117, annular pressure pad; 118, annular insulated water channel; 119, water inlet pipe; 120, water outlet pipe; 121, sealing O-ring; 122, lifting handle; 123, partition plate; 124, guide plate.

[0036] In the diagram: 200, Hot air assembly; 201, Hot air base; 202, Annular groove; 203, Annular hot air distribution static pressure module; 204, Annular hot air space; 205, Hot air duct; 206, Hot air outlet; 207, Annular hot air perforated distributor plate; 208, First annular hot air filter; 209, Second annular hot air filter; 210, Third annular hot air filter; 211, Fourth annular hot air filter; 212, Annular strip spacer; 213, Annular strip pressure ring; 214, Bolt; 215, Inner annular strip spacer; 216, Outer annular strip spacer; 217, Inner annular strip pressure ring; 218, Outer annular strip pressure ring; 219, Bolt; 220, Spacer sleeve. 222. Strip reinforcing rib; 223. U-shaped pipe; 224. Hot air inlet pipe; 225. Connecting flange; 226. Spinneret assembly mounting hole. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0038] like Figures 1 to 11 The illustration shows an embodiment of a compound dry spinning channel 000 of this utility model, comprising an upper channel 001 and a lower channel 002 connected vertically. The upper channel 001 includes a number of smaller channels, and the lower channel 002 is a larger channel. A channel connecting plate 003 is provided at the top of the larger channel, and a number of channel docking holes 004 are provided on the channel connecting plate 003. The number of smaller channels are correspondingly installed on the number of channel docking holes 004 on the channel connecting plate 003. The top of each smaller channel is provided with a hot air assembly 200 for conveying hot air downward into the smaller channel and a spinneret assembly 100 for spinning yarn downward into the smaller channel.

[0039] In this embodiment, the spinneret 100 is disposed at the center of the top of the small channel, and the hot air assembly 200 is disposed around the periphery of the spinneret 100 at the top of the small channel.

[0040] Preferably, the main passageway is a circular main passageway, and the small passageway is a circular small passageway.

[0041] Preferably, the number of the small passageways is no less than three.

[0042] In this embodiment, the hot air assembly 200 includes a hot air seat 201 fixed to the top of the small passageway, an annular groove 202 disposed on the lower end face of the hot air seat 201, and an annular hot air distribution static pressure module 203 disposed in the annular groove 202. An annular hot air space 204 is disposed between the bottom of the annular groove 202 and the annular hot air distribution static pressure module 203. A hot air pipe 205 is disposed on the upper end face of the hot air seat 201. The hot air pipe 205 extends downward into the annular hot air space 204. A hot air outlet 206 is disposed at the end of the hot air pipe 205 that enters the annular hot air space 204. The hot air delivery direction of the hot air outlet 206 of the hot air pipe 205 is set to avoid the hot air blowing directly towards the annular hot air distribution static pressure module 203.

[0043] As one of the preferred options for setting the hot air delivery direction of the hot air duct in this embodiment, the hot air delivery direction of the hot air outlet 206 of the hot air duct 205 is set in the horizontal direction.

[0044] As a second preferred embodiment of the hot air supply direction setting of the hot air duct, the hot air supply port 206 of the hot air duct 205 is inclined upward along the horizontal direction.

[0045] Preferably, a pair of hot air outlets 206 are provided at the end of the extension of the hot air duct 205, and the hot air delivery direction of the pair of hot air outlets 206 is consistent with the annular direction of the annular hot air space 204 in the vertically downward projection direction and is placed on both sides of the end of the extension of the hot air duct 205.

[0046] Preferably, the opening of the extension end of the hot air duct 205 is sealed with a sealing plate, and the pair of hot air outlets 206 are formed by opening on both sides of the end of the extension end of the hot air duct 205.

[0047] In this embodiment, the annular hot air distribution static pressure module 203 includes annular hot air porous distribution plate 207, a first annular hot air filter 208, a second annular hot air filter 209, a third annular hot air filter 210, and a fourth annular hot air filter 211 arranged sequentially from top to bottom. The annular hot air porous distribution plate 207 is positioned between the first annular hot air filter 208, between the first annular hot air filter 208 and the second annular hot air filter 209, and between the second annular hot air filter 209 and the third annular hot air filter 210. A ring-shaped spacer 212 is provided between the third annular hot air filter 210 and the fourth annular hot air filter 211 respectively, and a ring-shaped pressure ring 213 is connected to the lower end face of the fourth annular hot air filter 211; the annular hot air porous diverter plate 207, the first annular hot air filter 208, the second annular hot air filter 209, the third annular hot air filter 210 and the fourth annular hot air filter 211 are separated by the ring-shaped spacer 212 and then pressed and fixed on the annular hot air porous diverter plate 207 by bolts 214 and the ring-shaped pressure ring 213.

[0048] In this embodiment, the annular spacer 212 includes an inner annular spacer 215 and an outer annular spacer 216, and the annular pressure ring 213 includes an inner annular pressure ring 217 and an outer annular pressure ring 218. The annular hot air porous diverter plate 207 is suspended from the bottom of the annular groove 202 of the hot air seat 201 by bolts 219. The bolts 219 are fitted with spacers 220, which are disposed between the bottom of the annular groove 202 of the hot air seat 201 and the annular hot air porous diverter plate 207, thereby forming the annular hot air space 204 between the annular groove 202 of the hot air seat 201 and the annular hot air porous diverter plate 207.

[0049] Preferably, the inner annular spacer 215 and the outer annular spacer 216 are both split-and-assembled structures, and the inner annular pressure ring 217 and the outer annular pressure ring 218 are both full annular structures with a number of strip-shaped reinforcing ribs 222 connecting the inner annular pressure ring 217 and the outer annular pressure ring 218.

[0050] Preferably, the hot air ducts 205 provided on the upper surface of the hot air seat 201 are four in number and are distributed at intervals along the circumference.

[0051] Preferably, two of the four hot air ducts 205 located on one side are connected at their upper ends to form an inverted U-shaped duct 223, and two of the four hot air ducts 205 located on the other side are connected at their upper ends to form another inverted U-shaped duct 223. A hot air inlet pipe 224 extends from the top of the U-shaped duct 223, and a connecting flange 225 is provided at the end of the hot air inlet pipe 224. The connecting flange 225 is used to connect to an external hot air supply duct.

[0052] In this embodiment, the hot air 201 base has a spinneret mounting hole 226 at its center, which is the same as the spinneret mounting hole.

[0053] To facilitate the installation of the spinneret assembly, the U-shaped pipes 223 on both sides are bent at a certain angle towards the outside to avoid interference between the connecting flange 225 at the top of the U-shaped pipes 223 and the spinneret assembly during installation.

[0054] The aforementioned hot air assembly 200, by setting the hot air outlet direction after the hot air duct 205 enters the annular hot air space 204 to avoid the hot air blowing directly towards the annular hot air distribution static pressure module 203, can improve the static pressure performance of the hot air pressure in the annular hot air space 204. This makes the airflow of the hot air assembly 200 more uniform when it delivers hot air downwards through the annular hot air distribution static pressure module 203, preventing the hot airflow from disturbing the fine stream entering the spinning channel, thereby improving the quality of polyimide spinning.

[0055] The aforementioned hot air assembly 200 and the annular hot air distribution static pressure module 203 are provided with at least four layers of annular hot air filters, which further improves the uniformity and stability of the downward hot air delivery.

[0056] The aforementioned hot air assembly 200 uses multiple hot air ducts 205 to deliver air simultaneously, further improving the uniformity of air delivery.

[0057] The aforementioned hot air component 200 can be used as a standalone module, which is easy to install, disassemble, and maintain.

[0058] In this embodiment, the spinneret assembly includes a spinneret mounting base 101 with an internal chamber, a spinneret 102 mounted at the bottom of the internal chamber of the spinneret mounting base 101, a spinneret feed plate 103 mounted at the upper part of the internal chamber of the spinneret mounting base 101, and a spinneret feed hole 104 disposed at the center of the spinneret feed plate 103; the spinneret mounting base 101 has a uniformly distributed spinneret in the internal chamber located between the spinneret feed plate 103 and the spinneret 102. The spinneret uniform distribution device 105 includes an upper spinneret distribution plate 106 and a lower spinneret distribution plate 107 arranged at vertical intervals. The upper spinneret distribution plate 106 is provided with a plurality of upper distribution holes 108 for the spinneret (polyimide solution, i.e., PI solution) to pass through. The lower spinneret distribution plate 107 is provided with a plurality of lower distribution holes 109 for the spinneret to pass through. The upper distribution holes 108 and the lower distribution holes 109 are staggered from each other in the vertically downward projection direction.

[0059] Preferably, the spinneret 102 in the spinneret assembly 100 is a multi-hole integrated spinneret, and multiple spinneret holes are arranged in a circumferential array on multiple concentric circles on the multi-hole integrated spinneret 102.

[0060] In this embodiment, the hot air base 201 has a spinneret assembly mounting hole 226 at its center, and the spinneret mounting base 101 is fixed in the spinneret assembly mounting hole 226 of the hot air base 201.

[0061] To achieve a more uniform distribution of the spinneret, a number of receiving grooves 110 for receiving the spinneret are arranged adjacently around the circumference of the upper end face of the spinneret upper distribution plate 106. The width of the receiving grooves 110 gradually increases from the center position 113 of the spinneret upper distribution plate 106 to the radial periphery in the vertically downward projection direction. The receiving grooves 110 have a pointed shape 111 at the end located at the center position 113 and an arc shape 112 at the end located at the farthest point of the radial periphery. Each of the upper distribution holes 108 on the spinneret upper distribution plate 106 is placed on the corresponding receiving groove 110.

[0062] The bottom of the liquid receiving tank 110 is deeper in the direction from the center position 113 of the spinneret liquid distribution plate 106 to the radial periphery.

[0063] Preferably, the upper distribution hole 108 on the liquid receiving tank 110 has a larger diameter in the direction from the center position 113 of the upper distribution plate 106 of the spinneret to the radial periphery.

[0064] Preferably, the sidewalls formed between adjacent liquid receiving tanks 110 have sharp corners at their upper tops, and the wall thickness of the sidewalls gradually increases from the upper top to the lower bottom.

[0065] In this embodiment, a spinneret filter screen 115 is provided between the spinneret distribution plate 107 and the spinneret plate 102.

[0066] In this embodiment, an annular spacer 116 is provided between the upper spinneret distribution plate 106 and the lower spinneret distribution plate 107 to separate the upper spinneret distribution plate 106 and the lower spinneret distribution plate 107, and an annular pressure pad 117 is provided between the spinneret feed plate 103 and the upper spinneret distribution plate 106 to press down the upper spinneret distribution plate 106.

[0067] Preferably, the spinneret feed plate 103 is installed on the upper part of the internal cavity of the spinneret mounting base 101 by connecting bolts, and presses down the annular pressure pad 117.

[0068] In this embodiment, an annular heat-insulating water channel 118 is provided on the annular wall of the inner cavity outside the spinneret mounting base 101.

[0069] In this embodiment, the spinneret mounting base 101 is provided with an inlet pipe 119 and an outlet pipe 120 that connect to the annular insulated water channel 118.

[0070] In this embodiment, the spinneret mounting base 101 is provided with a positioning outer circle adapted to the hot air assembly on the spinneret channel of polyimide spinning. An annular groove is provided on the positioning outer circle, and a sealing O-ring 121 is provided in the annular groove.

[0071] In this embodiment, the spinneret feed plate 103 is connected to a lifting handle 122 for easy hoisting during assembly and disassembly.

[0072] In this embodiment, a baffle 123 is provided in the annular insulated water channel 118 of the spinneret mounting base 101 at a position between the water inlet pipe 119 and the water outlet pipe 120.

[0073] Preferably, a guide plate 124 is provided in the annular insulated water channel 118 of the spinneret mounting base 101 at a position outside the area between the inlet pipe 119 and the outlet pipe 120. In the two adjacent guide plates 124, one guide plate 124 is placed at the top of the annular insulated water channel 118 and the other guide plate 124 is placed at the bottom of the annular insulated water channel 118, so that the guide plates 124 are staggered in the vertical direction to realize the tortuous flow of the insulated water in the annular insulated water channel 118.

[0074] In this embodiment, the working principle of the spinneret assembly 100 is as follows: the spinneret with a certain pressure enters the internal cavity of the spinneret mounting base 101 through the spinneret inlet hole 104 on the spinneret inlet plate 103. After being split into two stages by the upper spinneret distribution plate 106 and the lower spinneret distribution plate 107, it enters the space between the lower spinneret distribution plate 107 and the spinneret 102. After forming a spinneret with uniform flow and pressure difference, it is uniformly sprayed downward from each spinneret hole on the spinneret 102. After being processed by the spinning channel of polyimide spinning below, high-quality polyimide spinning with good uniformity is obtained.

[0075] The aforementioned spinneret assembly 100 has a spinneret uniform distribution device 105 installed in the spinneret mounting base 101. Its specially designed diversion and uniform distribution structure improves the uniform distribution of the spinneret when it reaches the spinneret, thereby producing polyimide spinning with good uniformity and thus improving the quality of polyimide spinning.

[0076] The aforementioned spinneret 100 features a specially designed annular insulated water channel 118, which allows the insulated water to flow in a tortuous manner within the annular insulated water channel 118. This improves the temperature uniformity of the spinning solution within the spinneret mounting base 101 and helps prevent the adverse effects of the heat from the external hot air assembly 200 on the spinning solution inside the spinneret mounting base 101, thereby improving the quality of subsequent spinning.

[0077] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A compound dry spinning tunnel, characterized in that, The system includes an upper tunnel and a lower tunnel that are connected vertically. The upper tunnel includes a number of smaller tunnels, and the lower tunnel is a large tunnel. A tunnel connecting plate is provided at the top of the large tunnel, and a number of tunnel docking holes are provided on the tunnel connecting plate. The number of smaller tunnels are installed on the tunnel docking holes of the tunnel connecting plate. The top of each smaller tunnel is provided with a hot air assembly for conveying hot air downward into the smaller tunnel and a spinneret assembly for spinning silk downward into the smaller tunnel.

2. The compound dry spinning tunnel according to claim 1, characterized in that, The spinneret assembly is located at the center of the top of the small tunnel, and the hot air assembly is arranged around the spinneret assembly at the top of the small tunnel.

3. The compound dry spinning tunnel according to claim 1, characterized in that, The main passageway is a circular main passageway, and the smaller passageway is a circular smaller passageway.

4. The compound dry spinning tunnel according to claim 1, characterized in that, The number of the small passageways shall not be less than three.

5. A compound dry spinning tunnel according to claim 1, characterized in that, The hot air assembly includes a hot air seat fixed to the top of the small passageway, an annular groove disposed on the lower end face of the hot air seat, and an annular hot air distribution static pressure module disposed within the annular groove. An annular hot air space is provided between the bottom of the annular groove and the annular hot air distribution static pressure module. A hot air duct is disposed on the upper end face of the hot air seat. The hot air duct extends downward into the annular hot air space. A hot air outlet is disposed at the end of the hot air duct that enters the annular hot air space. The hot air delivery direction of the hot air outlet of the hot air duct is set to avoid the hot air blowing directly towards the annular hot air distribution static pressure module.

6. A compound dry spinning tunnel according to claim 5, characterized in that, The extension end of the hot air duct is provided with a pair of hot air outlets, and the hot air delivery direction of the pair of hot air outlets is consistent with the annular direction of the annular hot air space in the vertically downward projection direction and is located on both sides of the extension end of the hot air duct.

7. A compound dry spinning tunnel according to claim 5, characterized in that, The spinneret assembly includes a spinneret mounting base with an internal chamber, a spinneret mounted at the bottom of the internal chamber of the spinneret mounting base, a spinneret feed plate mounted at the upper part of the internal chamber of the spinneret mounting base, and a spinneret feed hole located at the center of the spinneret feed plate. The spinneret mounting base has a spinneret uniform distribution device in the internal chamber located between the spinneret feed plate and the spinneret. The spinneret uniform distribution device includes an upper spinneret distribution plate and a lower spinneret distribution plate arranged at vertical intervals. The upper spinneret distribution plate has a number of upper distribution holes for the spinneret to pass through, and the lower spinneret distribution plate has a number of lower distribution holes for the spinneret to pass through. The upper distribution holes and the lower distribution holes are staggered from each other in the vertically downward projection direction.

8. A compound dry spinning tunnel according to claim 7, characterized in that, The spinneret in the spinneret assembly is a multi-hole integrated spinneret, and multiple spinneret holes are arranged in a circumferential array on multiple concentric circles on the multi-hole integrated spinneret.

9. A compound dry spinning tunnel according to claim 7, characterized in that, The hot air base has a spinneret mounting hole at its center, and the spinneret mounting base is fixed in the spinneret mounting hole of the hot air base.

10. A compound dry spinning tunnel according to claim 7, characterized in that, An annular heat-insulating water channel is provided on the annular wall of the inner cavity outside the spinneret mounting base.

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