Circulating air draft and compressed air web forming system and method for flash spinning

Abstract

The invention provides a circulating air draft compressed air web forming system and method for flash spinning, and solves the problem that the wind field control effect is poor in the spinning web forming process, the circulating air draft compressed air web forming system comprises a silk screen conveying assembly, the silk screen conveying assembly is provided with a circulating air blowing assembly, and the silk screen conveying assembly is provided with a circulating air draft assembly. The circulating air blowing assembly communicates with the circulating air draft assembly through the circulating driving assembly, and the silk screen conveying assembly is provided with an isolation air draft assembly linked with the circulating air blowing assembly and the circulating air draft assembly. The net forming device has the advantages of good net forming effect, stable structure and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of flash spinning, and particularly relates to a circulating suction and pressure blowing web forming system and method for flash spinning. Background Art

[0002] One of the most core technologies in spinning technology is wind field control. For example, in meltblowing and anti-sticking, strict wind field control is required for fiber web forming. Especially for meltblown fine denier fibers, once the suction wind field gets out of control, the stretching air flow can instantly disperse the fibers. The most core of flash spinning technology is wind field web laying. The fiber fineness of flash spinning is finer than that of meltblown fibers. Flash spinning is also supersonic spinning, and a large amount of solvent vapor is generated during spinning. Due to the pressure difference, a strong wind field will be generated near the spinning components. Also, since the spun silk web is light in weight and has a large specific surface area, it will be carried by the air flow and fly. Especially when multiple spinnerets are used for production, the air flows will affect each other. Therefore, wind field control is an extremely crucial technology for flash spinning and web laying.

[0003] To solve the deficiencies of the existing technology, people have conducted long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a processing device for flash non-woven fabric [202321401648.0], which includes a drying box body. Inside the drying box body, several transmission guide rollers are installed, and a transmission channel for the non-woven fabric to be tensioned and transmitted is left between the transmission guide rollers. A blowing component opposite to the transmission channel is installed inside the drying box body, and a heating component is arranged between the blowing component and the transmission channel; the blowing component includes a blowing box body arranged between adjacent transmission guide rollers, and air outlets opposite to the transmission channel and the heating component are respectively opened on the side surfaces of the blowing box body.

[0004] The above solution solves the problem of flash web laying to a certain extent, but there are still many deficiencies in this solution, such as poor wind field control effect during the fiber web forming process and other problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a reasonably designed circulating suction and pressure blowing web forming system for flash spinning with good wind field effect in view of the above problems.

[0006] Another purpose of the present invention is to provide a circulating suction and pressure blowing web forming method for flash spinning with good flash web laying effect in view of the above problems.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A circulating air extraction and air pressing nonwoven forming system for flash spinning, comprising a wire mesh transmission assembly, the wire mesh transmission assembly is equipped with a circulating air blowing assembly, the wire mesh transmission assembly is equipped with a circulating air extraction assembly, the circulating air blowing assembly and the circulating air extraction assembly are connected through a circulating drive assembly, and the wire mesh transmission assembly is equipped with an isolation air extraction assembly that is linked with the circulating air blowing assembly and the circulating air extraction assembly.

[0008] In the above-mentioned circulating air extraction and air pressing nonwoven forming system for flash spinning, the wire mesh transmission assembly includes a transmission box body, transmission ports for the wire mesh to enter and exit are opened at both ends of the transmission box body, a transmission guide roller rotatably connected to the transmission box body is arranged between the transmission ports, a transmission mesh is connected in a transmission manner between the transmission guide rollers, and a spinning nozzle opposite to the transmission mesh is installed on the top of the transmission box body.

[0009] In the above-mentioned circulating air extraction and air pressing nonwoven forming system for flash spinning, the transmission guide roller is equipped with a lifting assembly and a tension adjusting assembly; the lifting assembly includes a lifting guide rail vertically installed inside the transmission box body, the lifting guide rail is connected to a lifting seat through a lifting lead screw, the transmission guide roller is rotatably installed between the lifting seats and is connected to a driving motor through a speed change gear set; the tension adjusting assembly includes an adjusting guide rail horizontally installed inside the transmission box body, the adjusting guide rails are arranged vertically one above the other and are respectively slidably installed with adjusting sliders, the adjusting sliders are meshed and driven with an adjusting motor through a gear and rack set, and the adjusting sliders are rotatably connected with an adjusting guide roller that presses against the transmission mesh.

[0010] In the above-mentioned circulating air extraction and air pressing nonwoven forming system for flash spinning, the circulating air blowing assembly includes redistribution air boxes symmetrically arranged on both sides of the spinning nozzle, the cross-section of the redistribution air box is a right triangle, one of the box plates where the right angle side is located is attached to the top of the transmission box body, the other box plate where the right angle side is located is arranged on the side away from the spinning nozzle, a plurality of blowing partition plates extending in the vertical direction are arranged horizontally inside the redistribution air box, and air blowing ports opposite to the transmission mesh are opened at the lower ends of the distribution cavities between adjacent blowing partition plates, the air blowing ports are strip-shaped and are distributed on the box plate where the hypotenuse of the redistribution air box is located, the lower ends of the blowing partition plates are connected to the hypotenuse of the redistribution air box, and a turning plate is rotatably installed in the distribution cavity, and the turning plate is connected to a turning motor through an eccentric connecting rod.

[0011] In the above-mentioned circulating air extraction and air pressing nonwoven forming system for flash spinning, the circulating air extraction assembly includes an air extraction hood arranged below the transmission mesh, a plurality of air extraction partition plates extending in the vertical direction are arranged horizontally inside the air extraction hood, and air extraction holes opposite to the transmission mesh are opened at the upper ends of the air extraction cavities between adjacent air extraction partition plates, the air extraction holes are arranged in a matrix and the aperture gradually decreases from the middle of the air extraction hood towards both sides.

[0012] In the above-mentioned circulating suction and pressure air forming network system for flash spinning, the isolation air suction component includes an air suction hood arranged between adjacent spinning nozzles. The air suction hood is in a long strip-shaped annular structure and the transmission mesh passes through the air suction hood. A flow guiding component and a pressurization component linked with the circulating driving component are arranged inside the air suction hood.

[0013] In the above-mentioned circulating suction and pressure air forming network system for flash spinning, the flow guiding component includes air suction cavities symmetrically arranged inside the air suction hood. A pair of air suction openings communicating with the air suction cavities are opened in the middle of the inner side of the air suction hood. The air suction cavities and the air suction openings form an air guiding flow channel in the shape of an airfoil. The opening directions of the air suction openings are opposite and respectively face the ports of the air suction hood.

[0014] In the above-mentioned circulating suction and pressure air forming network system for flash spinning, the pressurization component includes a turbo fan communicated with the air suction hood and the air suction cavities inside it. The turbo fan is connected with an air suction pipe, and the air suction pipe is communicated with the circulating driving component.

[0015] In the above-mentioned circulating suction and pressure air forming network system for flash spinning, the circulating driving component includes a circulating pipe connected with the circulating blowing component and the circulating suction component. The circulating pipe is connected with a circulating fan and a filter screen. A temperature sensor and a flow meter are arranged inside the circulating pipe.

[0016] A circulating suction and pressure air forming method for flash spinning, which adopts the above-mentioned circulating suction and pressure air forming network system for flash spinning, includes the following steps: S1: The transmission guide roller in the wire mesh transmission component drives the transmission mesh to move, and the spinning nozzles spray filaments towards the transmission mesh. S2: The circulating driving component provides driving force, and the circulating blowing component and the circulating suction component are started to perform circulating blowing to guide the silk fibers to form a web on the surface of the transmission mesh. S3: The isolation air suction component is started synchronously to eliminate the impact air flow between adjacent spinning nozzles.

[0017] Compared with the existing technology, the advantages of the present invention are as follows: The circulating blowing component and the suction component cooperate, the air is sucked under the mesh to eliminate the strong air flow, and the air is circulated and sent to the top to form a stable downward flow field, thereby reducing the air flow disturbance and ensuring the web forming quality; The isolation air suction component is located between adjacent spinning nozzles, sucks air circumferentially on the transmission mesh, effectively eliminates the impact air flow, enables the spinning nozzles to be arranged compactly, and reduces the floor space occupied by the wire mesh transmission component; The circulating driving component realizes the internal circulating blowing of the wire mesh transmission component, and further ensures the overall sealing of the flash spinning system. Description of the Drawings

[0018] Figure 1 is a structural cross-sectional view of the present invention; Figure 2is another structural sectional view of the present invention; Figure 3 is a schematic structural view of the circulating blowing assembly of the present invention; Figure 4 is a schematic structural view of the circulating air extraction assembly of the present invention; Figure 5 is a schematic structural view of the isolation air extraction assembly of the present invention; Figure 6 is a partial schematic view of the isolation air extraction assembly of the present invention; Figure 7 is a schematic structural principle diagram of the present invention; In the figure, there are wire mesh transmission assembly 1, transmission box body 11, transmission port 12, transmission guide roller 13, transmission wire mesh 14, spinning nozzle 15, circulating blowing assembly 2, redistribution air box 21, blowing partition 22, distribution cavity 23, air blowing port 24, flipping motor 25, flipping plate 26, circulating air extraction assembly 3, air extraction hood 31, air extraction partition 32, air extraction cavity 33, air extraction holes 34, circulating drive assembly 4, circulating pipe 41, circulating fan 42, filter screen 43, isolation air extraction assembly 5, air extraction hood body 51, air extraction cavity 52, air extraction port 53, air flow guiding channel 54, turbine fan 55, air extraction pipe 56, lifting assembly 6, lifting guide rail 61, lifting lead screw 62, lifting seat 63, drive motor 64, tension adjustment assembly 7, adjustment guide rail 71, adjustment slider 72, adjustment motor 73, adjustment guide roller 74. Detailed implementation manners

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0020] As Figure 1-7 shown, a circulating air extraction and pressure air forming network system for flash spinning includes a wire mesh transmission assembly 1 for transmitting after flash laying. The wire mesh transmission assembly 1 is equipped with a circulating blowing assembly 2 and a circulating air extraction assembly 3. The two cooperate to guide the air flow to flow vertically inside the wire mesh transmission assembly 1, thereby reducing the dispersion of silk fibers and ensuring the quality of the laid web. The circulating blowing assembly 2 and the circulating air extraction assembly 3 are connected and provided with a circulating force through a circulating drive assembly 4. The wire mesh transmission assembly 1 is equipped with an isolation air extraction assembly 5 that is linked with the circulating blowing assembly 2 and the circulating air extraction assembly 3. The isolation air extraction assembly 5 is arranged at intervals inside the circulating blowing assembly 2 to absorb the colliding air flow and ensure the stability of the air flow on the surface of the transmission wire mesh 14.

[0021] Specifically, the screen transmission assembly 1 includes a transmission box body 11. Transmission ports 12 for the screen to enter and exit are opened at both ends of the transmission box body 11. A transmission guide roller 13 rotatably connected to the transmission box body 11 is arranged between the transmission ports 12. A transmission mesh cloth 14 is drivingly connected between the transmission guide rollers 13. A spinning nozzle 15 opposite to the transmission mesh cloth 14 is installed on the top of the transmission box body 11. The transmission mesh cloth 14 moves in a cycle. Among them, the spinning nozzle 15 sprays silk fibers by supersonic or near-sonic jet, and the silk fibers are laminated into a net on the surface of the transmission mesh cloth 14.

[0022] Furthermore, different from the conventional fixed transmission structure, the transmission guide roller 13 in this embodiment is equipped with a lifting assembly 6 and a tension adjusting assembly 7; the lifting assembly 6 includes a lifting guide rail 61 vertically installed inside the transmission box body 11. The lifting guide rail 61 is drivingly connected with a lifting seat 63 through a lifting lead screw 62. The transmission guide roller 13 is rotatably installed between the lifting seats 63 and is drivingly connected with a driving motor 64 through a speed-changing gear set; the lifting assembly 6 realizes the up-and-down lifting of some transmission guide rollers 13, thereby adjusting the relative distance between the transmission mesh cloth 14 and the spinning nozzle 15, shortening the fiber movement stroke, and generating flash evaporation mesh cloths with different stacking densities.

[0023] Since the local part of the transmission mesh cloth 14 moves up and down along with the transmission guide roller 13, the tension adjusting assembly 7 maintains the flatness of its local surface. The tension adjusting assembly 7 includes adjusting guide rails 71 horizontally installed inside the transmission box body 11. The adjusting guide rails 71 are arranged up and down and are respectively slidably installed with adjusting sliders 72. The adjusting sliders 72 are meshed and driven with an adjusting motor 73 through a gear and rack set. The adjusting sliders 72 are rotatably connected with adjusting guide rollers 74 that press against the transmission mesh cloth 14. The left-and-right movement of the adjusting guide rollers 74 causes the local lamination of the transmission mesh cloth 14.

[0024] Furthermore, unlike the existing blowing structure, in order to adapt to the fiber injection direction of the spinning nozzle 15, this embodiment further optimizes and adjusts the position of the blowing port 24, wherein the circulating blowing assembly 2 specifically includes redistribution air boxes 21 symmetrically arranged on both sides of the spinning nozzle 15, and the cross-section of the redistribution air box 21 is a right triangle, wherein the box plate where one of the right-angled sides is located is in contact with the top of the transmission box body 11, and the box plate where the other right-angled side is located is arranged on the side away from the spinning nozzle 15. A number of blowing baffles 22 extending in the vertical direction are arranged horizontally inside the redistribution air box 21, and a blowing port 24 opposite to the transmission mesh 14 is opened at the lower end of the distribution cavity 23 between adjacent blowing baffles 22. The blowing port 24 is in the shape of an elongated strip and is distributed on the box plate where the hypotenuse of the redistribution air box 21 is located, and the lower end of the blowing baffle 22 is connected to the hypotenuse of the redistribution air box 21. A triangular guide space, opposite the spinning nozzle 15, is left between adjacent redistribution airboxes 21 to ensure that the sprayed silk fibers are evenly dispersed onto the surface of the transmission mesh 14. A flip plate 26 is rotatably mounted within the distribution chamber 23. This flip plate 26 is connected to a flip motor 25 via an eccentric connecting rod. The flip motor 25 and flip plate 26 adjust the air flow rate within the distribution chamber 23 to prevent the air volume from affecting the formation of the silk fibers.

[0025] Furthermore, the circulating exhaust assembly 3 corresponds to the circulating blowing assembly 2 one-to-one, and specifically includes an exhaust hood 31 arranged below the transmission mesh 14. The exhaust hood 31 is usually linked to the lifting assembly 6 and lifted synchronously to ensure that it is at a constant distance from the transmission mesh 14. The negative pressure suction it provides ensures that the silk fibers are adsorbed on the fiber web. The dispersed airflow of a single nozzle is not uniformly downward, but has the characteristics of fast airflow speed in the middle and slower speed at both ends. Therefore, the design of the exhaust must also consider the matching exhaust hood 31 so as to provide a more matching wind field. Inside the exhaust hood 31, there are several exhaust baffles 32 extending in the vertical direction arranged horizontally, and the upper end of the exhaust cavity 33 between adjacent exhaust baffles 32 is provided with exhaust holes 34 opposite to the transmission mesh 14. The exhaust holes 34 are arranged in a matrix and the aperture gradually decreases from the middle of the exhaust hood 31 toward the two sides. A φ10mm orifice plate is used in the middle area, and a φ5mm orifice plate is used in the end areas. This ensures that the wind resistance in the middle is smaller than that at the ends, and the airflow in the middle is greater. A large amount of gas will be sucked away through the middle area, thereby reducing the generation of scattered airflow. The trace amount of scattered airflow on both sides can be basically eliminated through secondary suction on both sides. To ensure that the wind fields do not interfere with each other, an exhaust baffle 32 is built into each exhaust hood 31 to effectively and evenly distribute the air, making the exhaust process more uniform.

[0026] In addition, due to production space limitations, it is necessary to shorten the movement stroke of the wire mesh transmission component 1, and the relative distance of the spinning nozzles 15 is also shortened accordingly. At this time, the paired redistribution air boxes 21 in the circulating air blowing component 2 blow downward, and the adjacent spinning nozzles 15 inevitably generate impact airflows. Therefore, an isolation air suction component 5 is added at this place to eliminate the impact airflows while not affecting the falling of the silk fibers. The isolation air suction component 5 includes an air suction hood body 51 arranged between adjacent spinning nozzles 15. The air suction hood body 51 is in a long strip-shaped annular structure and the transmission mesh cloth 14 passes through the air suction hood body 51. The air suction hood body 51 is internally provided with a flow guiding component and a pressurization component linked to the circulating drive component. The pressurization component provides driving force for the flow guiding component, and negative pressure suction is generated inside the air suction hood body 51 to guide the airflows on the surface of the transmission mesh cloth 14 to flow horizontally and enter the circulating drive component 4 for circulation.

[0027] Meanwhile, different from the existing air ducts, the flow guiding component in this embodiment includes air suction cavities 52 symmetrically arranged inside the air suction hood body 51. A pair of air suction openings 53 communicating with the air suction cavities 52 are opened in the middle of the inner side of the air suction hood body 51. The air suction cavities 52 and the air suction openings 53 form an airfoil-shaped air guiding flow channel 54. The opening directions of the air suction openings 53 are opposite and respectively face the ports of the air suction hood body 51. Negative pressure is generated in the air suction cavities 52 on the inner side of the air suction hood body 51, and the air inside the air suction hood body 51 is sucked into the air suction openings 53. Under the action of the Bernoulli principle, the air suction hood body 51 has two-way air intake, thereby eliminating the impact airflows.

[0028] Visibly, the pressurization component includes a turbo fan 55 communicating with the air suction hood body 51 and the air suction cavities 52 inside it. The turbo fan 55 is connected with an air suction pipe 56, and the air suction pipe 56 is communicated with the circulating drive component 4. The turbo fan 55 provides sufficient negative pressure suction, and the air suction pipe 56 and the circulating drive component 4 form a complete circulation loop, thereby maintaining a slightly negative pressure environment inside the wire mesh transmission component 1.

[0029] Obviously, the circulating drive component 4 includes a circulating pipe 41 connected to the circulating air blowing component 2 and the circulating air extraction component 3. The circulating pipe 41 is connected with a circulating fan 42 and a filter screen 43. A temperature sensor and a flowmeter are arranged inside the circulating pipe 41. The circulating drive component 4 provides circulating driving force, filters the scattered silk fibers during the driving process, and maintains the stable blowing and air extraction states by means of feedback adjustment.

[0030] A circulating air extraction and pressure blowing web forming method for flash spinning uses the above-mentioned circulating air extraction and pressure blowing web forming system for flash spinning, and includes the following steps: S1: The transmission guide rollers 13 in the wire mesh transmission component 1 drive the transmission mesh cloth 14 to move, and the spinning nozzles 15 spray silk towards the transmission mesh cloth 14; S2: The cyclic drive assembly provides driving force, and the cyclic air blowing assembly 2 and the cyclic air extraction assembly 3 are started to perform cyclic air blowing to guide the filament fibers to form a web on the surface of the transmission mesh cloth 14; S3: The isolation air extraction assembly 5 is started synchronously to eliminate the impact air flow between adjacent spinning nozzles 15.

[0031] Embodiment 1 In this embodiment, the cyclic air blowing assembly 2 and the cyclic air extraction assembly 3 work synchronously. The distance between the spinning nozzles 15 is relatively far, and the flying filament phenomenon caused by the air flow impact can be eliminated by the cyclic air extraction assembly 3.

[0032] Embodiment 2 In this embodiment, the distance between the spinning nozzles 15 is shortened, and the isolation air extraction assembly 5 is started to absorb the impact air flow generated by it. At the same time, the isolation air extraction assembly 5 has double-sided air intake to guide the air to flow horizontally along the surface of the transmission mesh cloth 14 to ensure the uniform distribution of the filament fibers.

[0033] In summary, the principle of this embodiment is as follows: The wire mesh transmission assembly 1 performs flash spinning and web forming during the transmission process. During the spinning process, the cyclic air blowing assembly 2 and the cyclic air extraction assembly 3 guide the filament fibers to vertically fall and stack on the transmission mesh cloth 14 from above and below. The isolation air extraction assembly 5 is located between the spinning nozzles 15 to absorb the impact air flow, thereby ensuring the fiber web forming quality.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although terms such as wire mesh transmission assembly 1, transmission box body 11, transmission port 12, transmission guide roller 13, transmission mesh cloth 14, spinning nozzle 15, cyclic air blowing assembly 2, redistribution air box 21, air blowing partition 22, distribution cavity 23, air blowing port 24, flipping motor 25, flipping plate 26, cyclic air extraction assembly 3, air extraction hood 31, air extraction partition 32, air extraction cavity 33, air extraction hole 34, cyclic drive assembly 4, cyclic pipe 41, cyclic fan 42, filter screen 43, isolation air extraction assembly 5, air extraction hood body 51, air extraction cavity 52, air extraction port 53, air guiding flow channel 54, turbine fan 55, air extraction pipe 56, lifting assembly 6, lifting guide rail 61, lifting lead screw 62, lifting seat 63, drive motor 64, tension adjustment assembly 7, adjustment guide rail 71, adjustment slider 72, adjustment motor 73, adjustment guide roller 74 are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A circulating air blowing and air pressure forming network system for flash spinning, comprising a wire mesh transmission component (1), wherein the wire mesh transmission component (1) is equipped with a circulating air blowing component (2), and the wire mesh transmission component (1) is equipped with a circulating air extraction component (3), characterized in that, The described circulating air blowing assembly (2) and the circulating air extraction assembly (3) are connected through a circulating drive assembly (4), and the wire mesh transmission assembly (1) is equipped with an isolation air extraction assembly (5) that is linked with the circulating air blowing assembly (2) and the circulating air extraction assembly (3).

2. The circulating air extraction and air pressing web forming system for flash spinning according to claim 1, wherein, The wire mesh transmission assembly (1) includes a transmission box body (11). Transmission ports (12) for the wire mesh to enter and exit are opened at both ends of the transmission box body (11), and transmission guide rollers (13) rotatably connected to the transmission box body (11) are arranged between the transmission ports (12).

3. The circulating air extraction and blowing air forming network system for flash spinning according to claim 2, wherein, A transmission mesh cloth (14) is drivingly connected between the transmission guide rollers (13), and a spinning nozzle (15) opposite to the transmission mesh cloth (14) is installed on the top of the transmission box body (11).

4. A circulating air extraction and pressure air forming network system for flash spinning according to claim 3, characterized in that The transmission guide rollers (13) are equipped with a lifting assembly (6) and a tension adjusting assembly (7); the lifting assembly (6) includes a lifting guide rail (61) vertically installed inside the transmission box body (11). The lifting guide rail (61) is drivingly connected with a lifting seat (63) through a lifting lead screw (62). The transmission guide rollers (13) are rotatably installed between the lifting seats (63) and are drivingly connected with a driving motor (64) through a speed change gear set.

5. A circulating air extraction and blowing web-forming system for flash spinning according to claim 4, characterized in that, The tension adjusting assembly (7) includes an adjusting guide rail (71) horizontally installed inside the transmission box body (11). The adjusting guide rails (71) are arranged vertically one above the other and are respectively slidably installed with adjusting sliders (72). The adjusting sliders (72) are meshingly driven with an adjusting motor (73) through a gear and rack set. The adjusting sliders (72) are rotatably connected with adjusting guide rollers (74) that press against the transmission mesh cloth (14).

6. A circulating air extraction and pressure air forming network system for flash spinning according to claim 3, characterized in that, The circulating air blowing assembly (2) includes redistribution air boxes (21) symmetrically arranged on both sides of the spinning nozzle (15). The cross-section of the redistribution air box (21) is a right triangle. The box plate where one right side is located is attached to the top of the transmission box body (11), and the box plate where the other right side is located is arranged on the side away from the spinning nozzle (15).

7. The circulating air extraction and pressure air forming network system for flash spinning according to claim 6, characterized in that A number of blowing partition plates (22) extending in the vertical direction are arranged horizontally inside the redistribution air box (21), and air blowing openings (24) opposite to the transmission mesh cloth (14) are opened at the lower ends of the distribution cavities (23) between adjacent blowing partition plates (22).

8. A circulating air extraction and blowing air forming network system for flash spinning according to claim 7, characterized in that, The air blowing openings (24) are in a strip shape and are distributed on the box plate where the hypotenuse of the redistribution air box (21) is located. The lower ends of the blowing partition plates (22) are connected to the hypotenuse of the redistribution air box (21). A turning plate (26) is rotatably installed in the distribution cavity (23), and the turning plate (26) is drivingly connected with a turning motor (25) through an eccentric connecting rod.

9. A circulating air extraction and pressure air forming network system for flash spinning according to claim 3, characterized in that, The described circulating air extraction assembly (3) includes an air extraction hood (31) arranged below the transmission mesh cloth (14). Inside the air extraction hood (31), a number of air extraction partitions (32) extending in the vertical direction are arranged horizontally. An air extraction cavity (33) between adjacent air extraction partitions (32) has an air extraction hole (34) opened at the upper end opposite to the transmission mesh cloth (14). The air extraction holes (34) are arranged in a matrix, and the aperture gradually decreases from the middle of the air extraction hood (31) towards both sides.

10. A circulating air extraction and pressure air forming network system for flash spinning according to claim 3, characterized in that, The described isolation air suction assembly (5) includes an air suction hood body (51) arranged between adjacent spinning nozzles (15). The air suction hood body (51) has a long strip-shaped annular structure, and the transmission mesh cloth (14) passes through the air suction hood body (51). The air suction hood body (51) is internally provided with a flow guiding assembly and a pressurizing assembly linked to the circulating drive assembly.

11. A circulating air extraction and pressure air forming network system for flash spinning according to claim 10, characterized in that, The described flow guiding assembly includes air suction cavities (52) symmetrically arranged inside the air suction hood body (51). In the middle of the inner side of the air suction hood body (51), a pair of air suction openings (53) communicating with the air suction cavities (52) are opened. The air suction cavities (52) and the air suction openings (53) form an air flow guiding channel (54) in the shape of an airfoil.

12. A circulating air extraction and pressure air forming network system for flash spinning according to claim 11, characterized in that, The opening directions of the air suction openings (53) are opposite and respectively face the ports of the air suction hood body (51).

13. A circulating air extraction and pressure air forming network system for flash spinning according to claim 11, characterized in that, The described pressurizing assembly includes a turbo fan (55) communicating with the air suction hood body (51) and the air suction cavities (52) inside it. The turbo fan (55) is connected with an air suction pipe (56), and the air suction pipe (56) is communicated with the circulating drive assembly (4).

14. A circulating air extraction and blowing web-forming system for flash spinning according to claim 1, characterized in that, The described circulating drive assembly (4) includes a circulating pipe (41) connected to the circulating air blowing assembly (2) and the circulating air extraction assembly (3). The circulating pipe (41) is connected with a circulating fan (42) and a filter net (43). Inside the circulating pipe (41), a temperature sensor and a flow meter are arranged.

15. A method for forming a web by circulating air extraction and pressure blowing in flash spinning, which uses the system for forming a web by circulating air extraction and pressure blowing in flash spinning according to any one of the above claims 1-14, is characterized in that, It includes the following steps: S1: The transmission guide roller (13) in the wire mesh transmission assembly (1) drives the transmission mesh cloth (14) to move, and the spinning nozzles (15) spray filaments towards the transmission mesh cloth (14). S2: The circulating drive assembly provides driving force, and the circulating air blowing assembly (2) and the circulating air extraction assembly (3) are started to perform circulating air blowing to guide the silk fibers to spread on the surface of the transmission mesh cloth (14). S3: The isolation air suction assembly (5) is started synchronously to eliminate the impact air flow between adjacent spinning nozzles (15).

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