A cyclic suction pressure air laying system and method for use in flash spinning

Abstract

The application provides a circulating air extraction and air blowing system and method for flash spinning, which solves the problem of poor wind field control effect in the spinning and webbing process, and comprises 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 communicated through a circulating driving assembly, and the wire mesh transmission assembly is equipped with an isolated air suction assembly which is linked with the circulating air blowing assembly and the circulating air extraction assembly. The application has the advantages of good webbing effect, stable structure and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of flash spinning, and in particular relates to a circulating air extraction and pressure air web-forming system and method for flash spinning. Background Art

[0002] One of the core technologies in spinning is wind field control. For example, meltblowing and anti-sticking require strict wind field control during spinning and web formation. This is especially true for fine-denier meltblown fibers. If the suction wind field gets out of control, the drafting airflow can instantly scatter the fibers. The core of flash spinning technology is wind field web laying. Flash spinning produces finer fibers than meltblown fibers. Flash spinning is also supersonic, and the spinning process is accompanied by the generation of large amounts of solvent vapor. Due to the pressure difference, the large amount of vapor generated will generate a strong wind field near the spinning components. Since the spun wire mesh is light in weight and has a large specific surface area, it will be carried by the airflow and fly. Especially when using multiple spinnerets for production, the airflows will affect each other. Therefore, wind field control is extremely critical for flash spinning and web laying.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document discloses a flash nonwoven fabric processing device [202321401648.0], which includes a drying box, a plurality of transmission guide rollers installed inside the drying box, and a transmission channel between the transmission guide rollers for taut transmission of the nonwoven fabric. A blowing assembly is installed in the drying box opposite the transmission channel, and a heating assembly is provided between the blowing assembly and the transmission channel. The blowing assembly includes a blowing box disposed between adjacent transmission guide rollers, and the side of the blowing box has blowing ports respectively disposed opposite the transmission channel and the heating assembly.

[0004] The above solution solves the problem of flash web laying to a certain extent, but the solution still has many shortcomings, such as poor wind field control effect during the spinning web process. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a circulating air extraction and pressure-air web-forming system for flash spinning with reasonable design and good wind field effect.

[0006] Another object of the present invention is to address the above-mentioned problems and provide a circulating air-pressure web-forming method for flash spinning with good flash web-forming effect.

[0007] To achieve the above object, the application adopts the following technical scheme: A circulating air extraction and pressure air 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 communicated through a circulating driving assembly, and the wire mesh transmission assembly is equipped with an isolation air suction assembly linked with the circulating air blowing assembly and the circulating air extraction assembly.

[0008] In the circulating air extraction and pressure air forming system for flash spinning, the wire mesh transmission assembly comprises a transmission box body, transmission ports are formed at both ends of the transmission box body for the wire mesh to enter and exit, transmission guide rollers are arranged between the transmission ports and are rotationally connected with the transmission box body, a transmission mesh is drivingly connected between the transmission guide rollers, and a spinning nozzle is mounted on the top of the transmission box body and is opposite to the transmission mesh.

[0009] In the circulating air extraction and pressure air forming system for flash spinning, the transmission guide rollers are equipped with lifting assemblies and tension adjusting assemblies; the lifting assemblies comprise lifting guide rails vertically installed inside the transmission box body, the lifting guide rails are drivingly connected with lifting seats through lifting lead screws, the transmission guide rollers are rotationally installed between the lifting seats and are drivingly connected with a driving motor through a variable speed gear set; the tension adjusting assemblies comprise adjusting guide rails horizontally installed inside the transmission box body, adjusting sliding blocks are slidingly installed on the adjusting guide rails in an up-down arrangement, the adjusting sliding blocks are meshingly and drivingly connected with adjusting motors through a gear and rack set, and the adjusting sliding blocks are rotationally connected with adjusting guide rollers for pressing the transmission mesh.

[0010] In the circulating air extraction and pressure air forming system for flash spinning, the circulating air blowing assembly comprises redistribution air boxes symmetrically arranged on both sides of the spinning nozzle, the redistribution air boxes have a cross section in the shape of a right-angled triangle, one box plate where one right-angled side is located is attached to the top of the transmission box body, another box plate where another right-angled 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 in the redistribution air boxes in a horizontal arrangement, distribution cavities between adjacent blowing partition plates are open at the lower end and are opposite to the transmission mesh, the blowing ports are in the shape of a strip and are distributed on the box plate where the oblique side of the redistribution air box is located, the lower end of the blowing partition plate is connected with the oblique side of the redistribution air box, a turnover plate is rotationally installed in the distribution cavity, and the turnover plate is drivingly connected with a turnover motor through an eccentric connecting rod.

[0011] In the circulating air extraction and pressure air forming system for flash spinning, the circulating air extraction assembly comprises an air extraction cover arranged below the transmission mesh, a plurality of air extraction partition plates extending in the vertical direction are arranged in the air extraction cover in a horizontal arrangement, air extraction cavities between adjacent air extraction partition plates are open at the upper end and are opposite to the transmission mesh, the air extraction holes are arranged in a matrix and the hole diameters gradually decrease from the middle part of the air extraction cover to the two sides.

[0012] In the above-mentioned circulating exhaust pressure-air web-forming system used in flash spinning, the isolation suction component includes a suction hood arranged between adjacent spinning nozzles, the suction hood is a long ring structure and the transmission mesh passes through the suction hood, the suction hood has a built-in guide component and a booster component linked to the circulating drive component.

[0013] In the above-mentioned circulating exhaust compressed air web forming system used in flash spinning, the guide component includes a suction cavity symmetrically arranged in the suction hood body, and a pair of suction ports connected to the suction cavity are opened in the middle of the inner side of the suction hood body. The suction cavity and the suction ports form an airfoil-shaped air guide channel, and the opening directions of the suction ports are opposite and respectively face the ports of the suction hood body.

[0014] In the above-mentioned circulating suction and compressed air web-forming system used in flash spinning, the booster component includes a turbofan connected to the suction hood and the suction cavity inside it, the turbofan is connected to a suction pipe, and the suction pipe is connected to the circulating drive component.

[0015] In the above-mentioned circulating exhaust and compressed air web-forming system used in flash spinning, the circulating drive component includes a circulating pipe connected to the circulating blowing component and the circulating exhaust component, the circulating pipe is connected to a circulating fan and a filter, and the circulating pipe has a built-in temperature sensor and a flow meter.

[0016] A circulating air suction and compressed air web forming method for flash spinning, which uses the circulating air suction and compressed air web forming system for flash spinning, comprises the following steps:

[0017] S1: The transmission guide roller in the wire mesh transmission assembly drives the transmission mesh to move, and the spinning nozzle spins toward the transmission mesh;

[0018] S2: The circulating drive component provides driving force, and the circulating blowing component and the circulating exhaust component start to perform circulating blowing, guiding the silk fibers to lay on the surface of the transmission mesh;

[0019] S3: The isolated suction components are started synchronously to eliminate the collision of airflow between adjacent spinning nozzles.

[0020] Compared with the existing technology, the advantages of the present invention are: the circulating blowing component and the exhaust component cooperate to suck air under the mesh to eliminate strong airflow, and circulate the air to the top to form a smooth downward flow field, thereby reducing airflow disturbance and ensuring the quality of the mesh laying; the isolation suction component is located between adjacent spinning nozzles, and performs circumferential suction on the transmission mesh, effectively eliminating the colliding airflow, so that the spinning nozzles can be arranged compactly, reducing the space occupied by the wire mesh transmission component; the circulating drive component realizes circulating blowing inside the wire mesh transmission component, thereby ensuring the overall closedness of the flash spinning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a structural cross-sectional view of the present invention;

[0022] Figure 2 is another structural sectional view of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the circulating blowing assembly of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the circulating exhaust assembly of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the isolation suction assembly of the present invention;

[0026] Figure 6 It is a partial schematic diagram of the isolated air suction assembly of the present invention;

[0027] Figure 7 It is a structural principle diagram of the present invention;

[0028] In the figure, the screen transmission component 1, the transmission box 11, the transmission port 12, the transmission guide roller 13, the transmission mesh 14, the spinning nozzle 15, the circulation blowing component 2, the redistribution bellows 21, the blowing baffle 22, the distribution chamber 23, the blowing port 24, the flip motor 25, the flip plate 26, the circulation exhaust component 3, the exhaust hood 31, the exhaust baffle 32, the exhaust chamber 33, the exhaust hole 34, the circulation drive component 4, the circulation pipe 41, the circulation fan 42, the filter 43, the isolation suction component 5, the suction hood 51, the suction cavity 52, the suction port 53, the air guide channel 54, the turbo fan 55, the suction pipe 56, the lifting component 6, the lifting guide rail 61, the lifting screw 62, the lifting seat 63, the drive motor 64, the tension adjustment component 7, the adjustment guide rail 71, the adjustment slider 72, the adjustment motor 73, and the adjustment guide roller 74. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-7 As shown, a circulating air extraction and compressed air web-forming system for flash spinning includes a screen transmission assembly 1 for flash spinning and transmission. The screen transmission assembly 1 is equipped with a circulating blowing assembly 2. The screen transmission assembly 1 is equipped with a circulating exhaust assembly 3. The two components work together to guide the airflow vertically within the screen transmission assembly 1, thereby reducing the dispersion of silk fibers and ensuring the quality of the web. The circulating blowing assembly 2 and the circulating exhaust assembly 3 are connected through a circulating drive assembly 4 and provide circulating force. The screen transmission assembly 1 is equipped with an isolated suction assembly 5 that is linked to the circulating blowing assembly 2 and the circulating exhaust assembly 3. The isolated suction assembly 5 is arranged at intervals within the circulating blowing assembly 2 to absorb the colliding airflow, ensuring stable airflow on the surface of the transmission mesh 14.

[0031] Specifically, the wire mesh transport assembly 1 includes a transport box 11 with transport ports 12 at both ends for the wire mesh to enter and exit. Between the transport ports 12 are transport guide rollers 13 rotatably connected to the transport box 11. A transport mesh 14 is rotatably connected between the transport guide rollers 13. A spinning nozzle 15 is mounted on top of the transport box 11, facing the transport mesh 14. As the transport mesh 14 circulates, the spinning nozzle 15 ejects silk fibers at supersonic or near-sonic speeds, which are then stacked onto the surface of the transport mesh 14 to form a web.

[0032] In depth, unlike the conventional fixed transmission structure, the transmission guide roller 13 in this embodiment is equipped with a lifting component 6 and a tension adjustment component 7; the lifting component 6 includes a lifting guide rail 61 vertically installed inside the transmission box 11, and the lifting guide rail 61 is connected to the lifting seat 63 through a lifting screw 62. The transmission guide roller 13 is rotatably installed between the lifting seats 63 and is connected to the drive motor 64 through a speed change gear set; the lifting component 6 realizes the up and down lifting of part of the transmission guide roller 13, and then adjusts the relative distance between the transmission mesh 14 and the spinning nozzle 15, thereby shortening the fiber movement stroke and generating flash steaming meshes with different stacking densities.

[0033] Because the transmission mesh 14 partially moves up and down with the transmission guide roller 13, its local surface flatness is maintained by the tension adjustment assembly 7. The tension adjustment assembly 7 includes adjustment rails 71 mounted horizontally inside the transmission box 11. The adjustment rails 71 are arranged vertically and each slidably mounted with an adjustment slider 72. The adjustment slider 72 is meshed with an adjustment motor 73 via a gear rack assembly. The adjustment slider 72 is rotatably connected to an adjustment guide roller 74 that is pressed against the transmission mesh 14. The adjustment guide roller 74 moves left and right, causing the transmission mesh 14 to partially overlap.

[0034] 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.

[0035] 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.

[0036] In addition, due to production space limitations, it is necessary to shorten the movement stroke of the screen transmission component 1, wherein the relative distance of the spinning nozzles 15 is also shortened. At this time, the redistribution air boxes 21 arranged in pairs in the circulating blowing component 2 blow air downward, and the adjacent spinning nozzles 15 inevitably generate collision airflows. Therefore, an isolation suction component 5 is added thereto to eliminate the collision airflow without affecting the falling of the silk fibers. The isolation suction component 5 includes a suction hood 51 arranged between adjacent spinning nozzles 15. The suction hood 51 is a long annular structure and the transmission mesh 14 passes through the suction hood 51. The suction hood 51 has a built-in guide component and a boost component linked to the circulation drive component. The boost component provides driving force for the guide component, and the suction hood 51 generates negative pressure suction on the inside, guiding the airflow on the surface of the transmission mesh 14 to flow horizontally and enter the circulation drive component 4 for circulation.

[0037] At the same time, unlike existing air ducts, the air guide assembly in this embodiment includes an air suction cavity 52 symmetrically arranged within the air suction hood 51. A pair of air suction ports 53 communicating with the air suction cavity 52 are formed in the middle portion of the inner side of the air suction hood 51. The air suction cavity 52 and the air suction ports 53 form an airfoil-shaped air guide channel 54. The air suction ports 53 open in opposite directions and face the ends of the air suction hood 51. The air suction cavity 52 inside the air suction hood 51 generates negative pressure, and air inside the air suction hood 51 is drawn into the air suction ports 53. Under the action of the Nuber force principle, air enters the air suction hood 51 in both directions, thereby eliminating collision airflow.

[0038] As can be seen, the booster assembly includes a turbofan 55 that is connected to the suction hood 51 and the suction cavity 52 therein. The turbofan 55 is connected to a suction pipe 56, which is connected to the circulation drive assembly 4. The turbofan 55 provides sufficient negative pressure suction, and the suction pipe 56 and the circulation drive assembly 4 form a complete circulation loop, thereby maintaining a slightly negative pressure environment within the screen transmission assembly 1.

[0039] Obviously, the circulation drive assembly 4 includes a circulation pipe 41 connected to the circulation blowing assembly 2 and the circulation exhaust assembly 3. The circulation pipe 41 is connected to the circulation fan 42 and the filter 43. The circulation pipe 41 has a built-in temperature sensor and flow meter. The circulation drive assembly 4 provides the circulation driving force, filters the scattered silk fibers during the driving process, and uses feedback adjustment to maintain the blowing and exhausting states stable.

[0040] A circulating air suction and compressed air web forming method for flash spinning, which uses the circulating air suction and compressed air web forming system for flash spinning, comprises the following steps:

[0041] S1: The transmission guide roller 13 in the wire mesh transmission assembly 1 drives the transmission mesh 14 to move, and the spinning nozzle 15 spins toward the transmission mesh 14;

[0042] S2: The circulating drive assembly provides driving force, and the circulating blowing assembly 2 and the circulating exhaust assembly 3 start to perform circulating blowing, guiding the silk fibers to lay on the surface of the transmission mesh 14;

[0043] S3: The isolated suction assembly 5 is started synchronously to eliminate the collision of airflows between adjacent spinning nozzles 15 .

[0044] Example 1

[0045] In this embodiment, the circulating blowing component 2 and the circulating exhaust component 3 work synchronously. The spinning nozzle 15 is far away, and the circulating exhaust component 3 can eliminate the flying silk phenomenon caused by air flow collision.

[0046] Example 2

[0047] In this embodiment, the distance between the spinning nozzles 15 is shortened, and the isolated suction component 5 is started to absorb the impact airflow generated by it. At the same time, the isolated suction component 5 takes in air on both sides, guiding the air to flow horizontally along the surface of the transmission mesh 14 to ensure uniform distribution of the silk fibers.

[0048] To sum up, the principle of this embodiment is that the wire mesh transmission component 1 performs flash spinning to form a web during the transmission process, and during the spinning process, the circulating blowing component 2 and the circulating exhaust component 3 guide the silk fibers vertically to fall and stack on the transmission mesh cloth 14, wherein the isolation suction component 5 is located between the spinning nozzles 15 to absorb the impact airflow, thereby ensuring the quality of the fiber web.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0050] Although this article uses more terms such as screen transmission component 1, transmission box 11, transmission port 12, transmission guide roller 13, transmission mesh 14, spinning nozzle 15, circulation blowing component 2, redistribution bellows 21, blowing baffle 22, distribution chamber 23, blowing port 24, flip motor 25, flip plate 26, circulation exhaust component 3, exhaust hood 31, exhaust baffle 32, exhaust chamber 33, exhaust hole 34, circulation drive component 4, circulation pipe 41, circulation fan 42, filter 43, isolation suction component 5, suction hood 51, suction cavity 52, suction port 53, air guide channel 54, turbo fan 55, suction pipe 56, lifting component 6, lifting guide rail 61, lifting screw 62, lifting seat 63, drive motor 64, tension adjustment component 7, adjustment guide rail 71, adjustment slider 72, adjustment motor 73, adjustment guide roller 74, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitation construed in them would be contrary to the spirit of the present invention.

Claims

1. A circulating air-extraction and compressed air web-forming system for flash spinning, comprising a screen transmission component (1), wherein the screen transmission component (1) is equipped with a circulating air blowing component (2), and the screen transmission component (1) is equipped with a circulating air extraction component (3), characterized in that: The circulating blowing assembly (2) and the circulating exhaust assembly (3) are connected through the circulating driving assembly (4), and the screen transmission assembly (1) is equipped with an isolation suction assembly (5) linked to the circulating blowing assembly (2) and the circulating exhaust assembly (3); the screen transmission assembly (1) includes a transmission box (11), and transmission ports (12) for the screen to enter and exit are opened at both ends of the transmission box (11), and transmission guide rollers (13) rotatably connected to the transmission box (11) are arranged between the transmission ports (12); a transmission mesh (14) is connected to the transmission guide rollers (13) in a transmission manner, and a transmission mesh (14) is installed on the top of the transmission box (11). The spinning nozzle (15) is provided with a spinning nozzle (15); the isolation suction assembly (5) includes a suction hood (51) arranged between adjacent spinning nozzles (15); the suction hood (51) is in a long annular structure and the transmission mesh (14) passes through the suction hood (51); the suction hood (51) has a built-in guide assembly and a boost assembly linked to the circulation drive assembly; the guide assembly includes a suction cavity (52) symmetrically arranged in the suction hood (51); a pair of suction ports (53) connected to the suction cavity (52) are opened in the middle of the inner side of the suction hood (51); the suction cavity (52) and the suction port (53) form an airfoil-shaped air guide channel (54).

2. The circulating air suction pressure air-laid system for flash spinning according to claim 1, characterized in that: The transmission guide roller (13) is equipped with a lifting assembly (6) and a tension adjustment assembly (7); the lifting assembly (6) includes a lifting guide rail (61) vertically installed inside the transmission box (11), and the lifting guide rail (61) is connected to the lifting seat (63) through a lifting screw (62). The transmission guide roller (13) is rotatably installed between the lifting seats (63) and is connected to the drive motor (64) through a speed change gear set.

3. The circulating air suction pressure net-laying system for flash spinning according to claim 2, characterized in that: The tension adjustment assembly (7) includes an adjustment guide rail (71) horizontally installed inside the transmission box (11), the adjustment guide rails (71) are arranged up and down and are slidably installed with adjustment sliders (72), the adjustment sliders (72) are meshed with the adjustment motor (73) through a gear rack set, and the adjustment sliders (72) are rotatably connected to the adjustment guide rollers (74) pressed against the transmission mesh (14).

4. The circulating air suction pressure air-laid system for flash spinning according to claim 1, characterized in that: The circulating 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, wherein the box plate where one right-angled side 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).

5. The circulating air suction pressure air-laid system for flash spinning according to claim 4, characterized in that: The redistribution air box (21) has a plurality of blowing baffles (22) arranged in a transverse direction and extending in a vertical direction, and a blowing port (24) facing the transmission mesh (14) is formed at the lower end of the distribution cavity (23) between adjacent blowing baffles (22).

6. The circulating air suction pressure net-laying system for flash spinning according to claim 5, characterized in that: The blowing port (24) is in the shape of an elongated strip and is distributed on the box plate where the oblique side of the redistribution bellows (21) is located. The lower end of the blowing baffle (22) is connected to the oblique side of the redistribution bellows (21). A flip plate (26) is rotatably installed in the distribution chamber (23). The flip plate (26) is connected to the flip motor (25) through an eccentric connecting rod.

7. The circulating air suction pressure air-laid system for flash spinning according to claim 1, characterized in that: The circulating exhaust assembly (3) includes an exhaust hood (31) arranged below the transmission mesh (14), wherein a plurality of exhaust baffles (32) extending in the vertical direction are arranged in the transverse direction inside the exhaust hood (31), and an exhaust hole (34) opposite to the transmission mesh (14) is opened at the upper end of the exhaust cavity (33) between adjacent exhaust baffles (32), wherein the exhaust holes (34) are arranged in a matrix and the aperture gradually decreases from the middle of the exhaust hood (31) toward both sides.

8. The circulating air-pressure net-forming system for flash spinning according to claim 1, characterized in that: The air suction ports (53) are opened in opposite directions and face respectively toward the ports of the air suction hood (51).

9. The circulating air suction pressure air-laid system for flash spinning according to claim 1, characterized in that: The boosting assembly includes a turbofan (55) connected to the suction hood (51) and the suction cavity (52) therein. The turbofan (55) is connected to a suction pipe (56), and the suction pipe (56) is connected to the circulation drive assembly (4).

10. The circulating air suction pressure air-laid system for flash spinning according to claim 1, characterized in that: The circulation drive assembly (4) includes a circulation pipe (41) connected to the circulation blowing assembly (2) and the circulation exhaust assembly (3), the circulation pipe (41) is connected to a circulation fan (42) and a filter (43), and the circulation pipe (41) has a built-in temperature sensor and a flow meter.

11. A circulating air-extraction and pressure-air web-forming method for flash spinning, which uses the circulating air-extraction and pressure-air web-forming system for flash spinning according to any one of claims 1 to 10, characterized in that: The steps include: S1: The transmission guide roller (13) in the wire mesh transmission assembly (1) drives the transmission mesh (14) to move, and the spinning nozzle (15) spins the wire toward the transmission mesh (14); S2: The circulating driving component provides driving force, and the circulating blowing component (2) and the circulating exhaust component (3) start to perform circulating blowing, guiding the silk fibers to be laid on the surface of the transmission mesh (14); S3: The isolated suction assembly (5) is started synchronously to eliminate the collision airflow between adjacent spinning nozzles (15).

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