Preparation device of non-woven fabric

Abstract

The utility model discloses a non-woven fabric preparation device, and belongs to the technical field of non-woven fabrics. Comprising a lapping machine and two wire swinging structures, and the lapping machine comprises a web curtain, a main air suction air duct and an auxiliary air suction air duct; the two yarn swinging structures are respectively a main yarn swinging structure and an auxiliary yarn swinging structure; the yarn swinging structure comprises a yarn swinging support, N melt-blowing die head assemblies, a swinging piece, an air inlet header pipe and two amplitude limiting plates, N first air outlets are formed in the air inlet header pipe, air inlets of the melt-blowing die head assemblies are connected with the corresponding first air outlets through pipelines, and the two amplitude limiting plates are located above the left end and the right end of the web curtain correspondingly; the upper end, the front end and the rear end of the inner side of the amplitude limiting plate of the main yarn swinging structure are provided with first air blowing pipes blowing downwards, backwards and forwards respectively, the upper end of the inner side of the amplitude limiting plate of the auxiliary yarn swinging structure is provided with a second air blowing pipe blowing downwards, and the air inlet ends of the first air blowing pipes are connected with an air inlet header pipe on the main yarn swinging structure. The air inlet end of the second air blowing pipe is connected with an air inlet header pipe on the auxiliary yarn swinging structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of non-woven fabrics, and particularly relates to a preparation device for non-woven fabrics. Background Art

[0002] The preparation process of non-woven fabrics is as follows: the mixing device mixes raw material particles according to a ratio, the crystallization bed processes the raw materials, the drying device dries the raw materials, the extrusion device extrudes the raw materials to obtain a melt, the spinning box spins the fibers, the side blowing device air-cools the spun fibers, the web laying device lays the web, the needling device needles the web, and the slitting and winding device obtains the non-woven fabric.

[0003] The patent with the application number CN202023023215.5 discloses a cross-lapper for a polypropylene spunbond needle-punched nonwoven fabric production line, which mainly includes a cross-lapper frame, a wire mesh curtain, a main suction air duct, a main suction air pipe, an auxiliary suction air pipe, an auxiliary suction air duct, an electrostatic eliminator, a front guiding electrostatic eliminator, guide rollers, a front guiding assembly, a front guiding support assembly, a front guiding platform, a rear guiding platform, a driving guide roller, a tensioning device, a rear guiding roller, an error correction device, nylon rods, perforated plates and an oil spraying device. The cross-lapper frame is a frame-shaped structure. The wire mesh curtain is laid on the upper surface of the frame. The fiber bundle is received above the cross-lapper. Inside the cross-lapper frame, a main suction air duct and an auxiliary suction air duct are provided below the fiber bundle and the web. The main suction area is the position where the fiber bundle falls onto the cross-lapper, and the auxiliary suction area is to enable the web to smoothly transition on the wire mesh curtain. The electrostatic eliminator is fixed at the corresponding position above the cross-lapper frame and the auxiliary suction air duct. A front guiding platform is provided in the running direction of the electrostatic eliminator and the web. A rear guiding platform is provided behind the fiber bundle of the cross-lapper. Both the front guiding platform and the rear guiding platform are fixed on the cross-lapper frame. The front guiding support assembly is fixed at the front end of the cross-lapper frame. The upper part of the front guiding support is fixed on the front support frame of the front guiding assembly by bolts. One end of the front support frame is fixedly connected to one end of the cross-lapper frame, and a front guiding roller is provided at the other end of the front support frame. The front guiding electrostatic eliminator is fixedly connected to the upper part of the front support frame. Two guide rollers are fixed inside the front end of the cross-lapper frame, and the upper and lower positions of the two guide rollers correspond to each other. Rear guiding rollers are fixed at the upper and lower parts of the rear end of the cross-lapper frame. A tensioning device, a driving guide roller and a deviation correction device are arranged at the rear end of the cross-lapper frame. The wire mesh curtain of the cross-lapper is wound around the driving guide roller, the tensioning roller of the tensioning device, the rear guiding roller, the front guiding roller, the guide rollers and the deviation correction roller of the deviation correction device. The driving guide roller drives the movement of the wire mesh curtain. An oil spraying device is provided on the cross-lapper to evenly spray the lubricating finishing agent in the pressure vessel tank onto the web through the control of the oil delivery pipe, regulating valve and nozzle. The main suction air duct is divided into multiple main suction air windows, and each main suction air window is respectively connected to a corresponding main suction air pipe. The cross-sectional areas of the respective main suction air pipes are different, and the main suction air pipes gradually decrease from the center outwards. The auxiliary suction air duct is divided into multiple auxiliary suction air windows, and each auxiliary suction air window is respectively connected to a corresponding auxiliary suction air pipe. The area of a single auxiliary suction air window is larger than that of a single main suction air window. Both the main suction air pipe and the auxiliary suction air pipe are connected to the fan trench. Multiple perforated plates are provided at the suction openings of the main suction air duct and the auxiliary suction air duct, and nylon rods are provided on the perforated plates.

[0004] The patent with the application number CN202222286554.5 discloses a net curtain protection device on a web laying machine, which includes a meltblown die head assembly and a web forming machine arranged vertically. A meltblown spinneret plate assembly is arranged at the lower part of the meltblown die head assembly, and a fabric net curtain is wound around the web forming machine. It also includes a net curtain protection component, which includes a support frame and a slurry receiving plate. The support frame is arranged on the side of the fabric net curtain, and the slurry receiving plate is slidably arranged on the support frame. The slurry receiving plate moves to between the meltblown spinneret plate assembly and the fabric net curtain through sliding to block.

[0005] In the prior art, there is a large difference in the gram weight between the middle part and the two sides in the width direction of the non-woven fabric. To solve this problem, the prior art is to set width limiting plates on both sides of the web forming machine, and manually adjust the horizontal position, angle and inclination of the width limiting plates on both sides to achieve the function of adjusting the uniformity on both sides, and then cut off the fringes on both sides during the winding process. The width limiting plate is an important device for adjusting the width of the fiber web and the uniformity of the fiber web at the edge of the width; after the fiber bundle passes through air flow drafting and friction, it has static electricity. When the charged fiber bundle hits the width limiting plate, due to the fiber bundle carrying charge, the release of the charge will cause the fiber bundle to adhere to the surface of the width limiting plate, resulting in sticky plate or wire hanging, making the fiber laying thickness uneven at the edge, and the index at the edge is low, and it is difficult to adjust; until the finished product is processed, the uneven part at the edge needs to be completely cut off, resulting in great waste, and this waste is particularly prominent when producing non-woven fabrics with high gram weight.

[0006] To solve the above problems, the patent with the application number CN201910499794.3 discloses a width limiting plate device that can improve the uniformity of fiber web formation, which mainly includes a width limiting plate mechanism, an electrostatic generating device and a fixing bracket for the electrostatic generating device. A width limiting plate mechanism is arranged on the cross beam of the web laying machine, and the electrostatic generating device is connected to the width limiting plate mechanism through a fixing bracket for the electrostatic generating device. This device avoids sticky plate or wire hanging through static electricity, but has the disadvantages of complex structure and high cost. Utility Model Content

[0007] To solve the above problems, the embodiment of the present utility model provides a preparation device for non-woven fabrics, which uses the existing air source to avoid sticky plate or wire hanging of the width limiting plate, and adopts different methods for width limiting plates at different positions, and solves the problem with a simple structure and very low cost. The technical solution is as follows:

[0008] An embodiment of the present utility model provides a device for preparing non-woven fabric, which includes a cross-lapper and two filament arranging structures 4 arranged side by side front and back. The cross-lapper includes a wire mesh curtain 1 arranged in the front-back direction and a main air suction duct 2 and an auxiliary air suction duct 3 arranged side by side front and back below the wire mesh curtain 1; both of the two filament arranging structures 4 are located directly above the wire mesh curtain 1, and they are respectively a main filament arranging structure located directly above the main air suction duct 2 and an auxiliary filament arranging structure located directly above the auxiliary air suction duct 3; the filament arranging structure 4 includes a filament arranging bracket 41 above the wire mesh curtain 1, N meltblown die head assemblies 42 arranged side by side left and right on the filament arranging bracket 41, a swinging piece located directly below the meltblown die head assemblies 42 on the filament arranging bracket 41, an air inlet main pipe 43 above the filament arranging bracket 41, and two limiting plates 44 at the bottom of the filament arranging bracket 41. The air inlet main pipe 43 and the filament arranging bracket 41 are both arranged in the left-right direction. N first air outlets are arranged side by side left and right on the air inlet main pipe 43, and the air inlets of the meltblown die head assemblies 42 are connected to the corresponding first air outlets through pipelines. The two limiting plates 44 are respectively located above the left and right ends of the wire mesh curtain 1; at the inner upper end, inner front end, and inner rear end of the limiting plate 44 of the main filament arranging structure, there are respectively first air blowing pipes 5 that blow downward, backward, and forward. At the inner upper end of the limiting plate 44 of the auxiliary filament arranging structure, there is a second air blowing pipe 6 that blows downward. The air inlet end of the first air blowing pipe 5 is connected to the air inlet main pipe 43 on the main filament arranging structure, and the air inlet end of the second air blowing pipe 6 is connected to the air inlet main pipe 43 on the auxiliary filament arranging structure.

[0009] Specifically, the filament arranging bracket 41 in the embodiment of the present utility model is a rectangular frame. The air inlet main pipe 43 is located in the front upper part of the filament arranging bracket 41. The limiting plates 44 are arranged obliquely inward from top to bottom and obliquely inward from front to back.

[0010] Preferably, the front and rear ends of the lower part of the limiting plate 44 in the embodiment of the present utility model are both warped upward in an arc shape.

[0011] Among them, in the main filament arranging structure of the embodiment of the present utility model, N + 4 air outlets are arranged side by side left and right on the air inlet main pipe 43. The N air outlets in the middle are used as the first air outlets to be respectively connected to the N meltblown die head assemblies 42. Two first air blowing pipes 5 are correspondingly arranged for each limiting plate 44. The two first air blowing pipes 5 are respectively a straight flexible pipe 51 and a three-way flexible pipe 52. The 2 air outlets at the ends are used as the second air outlets and are respectively connected to the air inlet ends of the straight flexible pipe 51 and the three-way flexible pipe 52; the air outlet end of the straight flexible pipe 51 is located at the inner rear end of the limiting plate 44, and the two air outlet ends of the three-way flexible pipe 52 are respectively located at the inner upper end and the inner front end of the limiting plate 44; in the auxiliary filament arranging structure, N + 2 air outlets are arranged side by side left and right on the air inlet main pipe 43. The N air outlets in the middle are used as the first air outlets to be respectively connected to the N meltblown die head assemblies 42. The 1 air outlet at the end is used as the third air outlet and is connected to the air inlet end of the second air blowing pipe 6 of the corresponding limiting plate 44.

[0012] Further, first valves are provided on both the second air outlet and the third air outlet in the embodiment of the present utility model; the air inlet end of the three-way hose 52 is connected to the second air outlet, the lower end of one of its bifurcated pipes is located at the upper inner side of the limiting plate 44, and a second valve is provided on the other bifurcated pipe and its lower end is located at the front inner side of the limiting plate 44.

[0013] Further, a first pedestrian frame 7 is provided in front of the main wire swinging structure in the embodiment of the present utility model, a third pedestrian frame 9 is provided behind the auxiliary wire swinging structure, and a second pedestrian frame 8 is provided between the main wire swinging structure and the auxiliary wire swinging structure. The first pedestrian frame 7, the second pedestrian frame 8 and the third pedestrian frame 9 are all arranged in the left-right direction and are all located above the wire mesh 1; for the main wire swinging structure, the straight hose 51 bypasses the wire swinging bracket 41 backward and is fixed on the second pedestrian frame 8; one bifurcated pipe of the three-way hose 52 passes downward through the wire swinging bracket 41, and the other bifurcated pipe bypasses the wire swinging bracket 41 forward and is fixed on the first pedestrian frame 7; for the auxiliary wire swinging structure, the second air blowing pipe 6 passes downward through the wire swinging bracket 41.

[0014] Wherein, the outer side of the limiting plate 44 in the embodiment of the present utility model is adjustably arranged at the bottom of the wire swinging bracket 41 through a mounting bracket 10. The mounting bracket 10 includes two horizontal fixing rods arranged side by side in the front and rear on the outer side of the limiting plate 44, two vertical fixing rods arranged side by side in the front and rear at the bottom of the wire swinging bracket 41, a longitudinal fixing rod arranged in the front-rear direction at the lower part of the two vertical fixing rods, and a support ring located below the longitudinal fixing rod at the lower part of the vertical fixing rod; the horizontal fixing rods are arranged in the left-right direction, and long circular holes are provided on them along their directions, and they are fixed on the upper side of the longitudinal fixing rod through vertical locking bolts passing downward through the long circular holes; the vertical fixing rods are arranged vertically, and the longitudinal fixing rod and the support ring are both arranged on the vertical fixing rods in an adjustable up-and-down manner and are respectively locked through horizontal locking bolts.

[0015] Specifically, the horizontal fixing rod in the embodiment of the present utility model is a horizontal plate, the vertical fixing rod is a round rod, circular holes for the vertical fixing rod to pass through are provided on both the longitudinal fixing rod and the support ring, and the horizontal locking bolts are arranged in the left-right direction and are arranged on the outer sides of the longitudinal fixing rod or the support ring.

[0016] Specifically, the inner diameters of the first air blowing pipe 5 and the second air blowing pipe 6 in the embodiment of the present utility model are 4-10 mm.

[0017] The beneficial effects brought by the technical solution provided in the embodiment of the present utility model are as follows: The embodiment of the present utility model provides a preparation device for non-woven fabrics, which uses the existing air source to avoid the limiting plate from sticking to the plate or hanging wires, and adopts different methods for the limiting plates at different positions, solving the problem with a simple structure and a very low cost. It has been verified that by adopting the solution of this patent, only a very narrow edge needs to be cut during trimming, and the effect is similar to that of CN201910499794.3. Specifically, the applicant found that the limiting plate on the main wire-swinging structure needs to blow air from three directions. The air volume requirements for the upper and front directions are relatively small and can share a three-way pipe, and the front direction requires precise control (by controlling the second valve or directly closing it). The limiting plate on the auxiliary wire-swinging structure only needs to blow air from the upper direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the preparation device for non-woven fabrics provided in the embodiment of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the main wire-swinging structure;

[0020] Figure 3 is a schematic structural diagram of the auxiliary wire-swinging structure;

[0021] Figure 4 is a connection schematic diagram of the straight hose;

[0022] Figure 5 is a connection schematic diagram of the three-way hose.

[0023] In the figure: 1 mesh curtain, 2 main suction air duct, 3 auxiliary suction air duct, 4 wire-swinging structure, 5 first air blowing pipe, 6 second air blowing pipe, 7 first walkway, 8 second walkway, 9 third walkway, 10 mounting bracket;

[0024] 41 wire-swinging bracket, 42 meltblown die head assembly, 43 total air inlet pipe, 44 limiting plate;

[0025] 51 straight hose, 52 three-way hose. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1

[0028] See Figures 1-3, Embodiment 1 provides a non-woven fabric manufacturing apparatus, including a web forming machine and two filament laying structures 4 arranged side by side front and back. The web forming machine includes a wire mesh curtain 1 arranged in the front-back direction and a main suction air duct 2 and an auxiliary suction air duct 3 arranged side by side front and back below it. The main suction air duct 2 and the auxiliary suction air duct 3 are both conical covers that are larger at the top and smaller at the bottom and have open tops. The two filament laying structures 4 are both located directly above the wire mesh curtain 1, and they are respectively a main filament laying structure (with stronger ability relative to the auxiliary filament laying structure) and an auxiliary filament laying structure. The main filament laying structure and the auxiliary filament laying structure are respectively located directly above the main suction air duct 2 and the auxiliary suction air duct 3.

[0029] Among them, the filament laying structure 4 includes a filament laying bracket 41, N meltblown die head assemblies 42, N swing blades (not shown in the figure), an air inlet main pipe 43, and two limiting plates 44. Among them, the filament laying bracket 41 is arranged in the left-right direction, located above the wire mesh curtain 1, and is specifically a rectangular frame. The air inlet main pipe 43 is arranged in the left-right direction, located in front of and above the filament laying bracket 41, and has N first air outlets arranged side by side on it (specifically at the rear side), and is specifically a hard pipe with an inner diameter of 5 - 15 cm. The N meltblown die head assemblies 42 are arranged side by side left and right, fixed on the filament laying bracket 41, and arranged vertically. Each meltblown die head assembly 42 is correspondingly connected to a first air outlet, and a swing blade is correspondingly arranged directly below each meltblown die head assembly 42. The air inlet of the meltblown die head assembly 42 is connected to the corresponding first air outlet through an air inlet pipe (specifically a flexible pipe). The swing blade is arranged in the lower part inside the filament laying bracket 41 and can swing to lay filaments, and it is an existing structure. The two limiting plates 44 are both arranged at the bottom of the filament laying bracket 41, respectively located above the left and right ends of the wire mesh curtain 1. Among them, the limiting plate 44 is inclined inwards from top to bottom and from front to back, and is specifically a rectangular plate. Preferably, the front and rear ends of the lower part of the limiting plate 44 are both curved upwards. Specifically, the meltblown die head assemblies 42 are arranged in two columns (the two columns are arranged side by side front and back, and each column includes multiple meltblown die head assemblies 42 arranged side by side left and right). Correspondingly, the N swing blades are arranged in two columns, and the multiple swing blades in the same column are synchronously driven.

[0030] Among them, at the inner upper end, inner front end, and inner rear end of the limiting plate 44 of the main filament laying structure, first air blowing pipes 5 that blow downwards, backwards, and forwards are respectively provided. The first air blowing pipes 5 are one (divided into three, can be a four-way pipe), two (divided into two, can be a three-way pipe), or three. At the inner upper end of the limiting plate 44 of the auxiliary filament laying structure, a second air blowing pipe 6 that blows downwards is provided. The air inlet end of the first air blowing pipe 5 is connected to the air inlet main pipe 43 on the main filament laying structure, and the air inlet end of the second air blowing pipe 6 is connected to the air inlet main pipe 43 on the auxiliary filament laying structure.

[0031] Among them, the outer side of the amplitude-limiting plate 44 in the embodiment of the present utility model is adjustably arranged at the bottom of the wire-swinging support 41 through the mounting bracket 10. The mounting bracket 10 includes two horizontal fixing rods arranged side by side in the front and rear on the outer side of the amplitude-limiting plate 44, two vertical fixing rods arranged side by side in the front and rear at the bottom of the wire-swinging support 41, a longitudinal fixing rod arranged in the front and rear direction at the lower part of the two vertical fixing rods, and a support ring located below the longitudinal fixing rod at the lower part of the vertical fixing rod, etc. The outer ends of the two horizontal fixing rods are respectively fixed at the front and rear ends on the upper side of the longitudinal fixing rod. The horizontal fixing rod is arranged in the left-right direction, and a long circular hole is provided on it along its direction. It is fixed on the upper side of the longitudinal fixing rod through a vertical locking bolt passing downward through the long circular hole. The vertical fixing rod is arranged vertically. The longitudinal fixing rod and the support ring are both arranged on the vertical fixing rod in an adjustable up-and-down manner and are respectively locked through horizontal locking bolts. Loosen the vertical locking bolt and the horizontal locking bolt to adjust the amplitude-limiting plate 44. Specifically, the horizontal fixing rod is a horizontal plate, the vertical fixing rod is a round rod, and the support ring is a circular structure. Circular holes (slightly larger than the vertical fixing rod) for the vertical fixing rod to pass through are provided on both the longitudinal fixing rod and the support ring. The horizontal locking bolt is arranged in the left-right direction and is arranged on the outer side of the longitudinal fixing rod or the support ring.

[0032] Specifically, the inner diameters of the first air blowing pipe 5 and the second air blowing pipe 6 in the embodiment of the present utility model are 4-10 mm, and their inner diameters can be the same as the inner diameter of the air inlet pipe.

[0033] Embodiment 2

[0034] See Figures 1-5, Embodiment 2 provides a nonwoven fabric manufacturing apparatus, whose structure is basically the same as that of Embodiment 1, except that: in the main filament laying structure, N + 4 air outlets are arranged side by side on the left and right at the rear side of the main air inlet pipe 43, and the N air outlets in the middle are used as the first air outlets to be respectively connected to N meltblown die head assemblies 42. Two first air blowing pipes 5 are correspondingly arranged for each limiting plate 44. The two first air blowing pipes 5 are respectively a straight flexible pipe 51 (two in total) and a three-way flexible pipe 52 (two in total). The 2 air outlets at the ends are used as the second air outlets to be respectively connected to the air inlet ends (specifically, the upper ends) of the straight flexible pipe 51 and the three-way flexible pipe 52. The 2 air outlets at the left end are connected to the two first air blowing pipes 5 of the limiting plate 44 at the left end. The 2 air outlets at the right end are connected to the two first air blowing pipes 5 of the limiting plate 44 at the right end. The air outlet end (specifically, the lower end, which is arranged forward) of the straight flexible pipe 51 is located at the inner rear end of the limiting plate 44. The two air outlet ends (specifically, the lower ends, which are respectively arranged downward and backward) of the three-way flexible pipe 52 are respectively located at the inner upper end and the inner front end of the limiting plate 44. In the auxiliary filament laying structure, N + 2 air outlets are arranged side by side on the left and right on the main air inlet pipe 43. The N air outlets in the middle are used as the first air outlets to be respectively connected to N meltblown die head assemblies 42. The 1 air outlet at the end is used as the third air outlet to be connected to the air inlet end of the second air blowing pipe 6 of the corresponding limiting plate 44. The 1 air outlet at the left end is connected to the second air blowing pipe 6 of the limiting plate 44 at the left end. The 1 air outlet at the right end is connected to the second air blowing pipe 6 of the limiting plate 44 at the right end.

[0035] Further, referring to Figure 5 , first valves are provided on both the second air outlet and the third air outlet in the embodiments of the present utility model. The air inlet end of the three-way flexible pipe 52 is connected to the second air outlet. The lower end of one of its bifurcated pipes is located at the inner upper end of the limiting plate 44, and a second valve (which can adjust the air flow size and open / close) is provided on the other bifurcated pipe and its lower end is located at the inner front end of the limiting plate 44.

[0036] Further, referring to Figures 1-3 , a first walkway 7 is provided in front of the main filament laying structure of the embodiments of the present utility model, a third walkway 9 is provided behind the auxiliary filament laying structure, and a second walkway 8 is provided between the main filament laying structure and the auxiliary filament laying structure. The first walkway 7, the second walkway 8 and the third walkway 9 are all arranged in the left-right direction, and they are all located above the mesh curtain 1 and are used for people to walk on. For the main filament laying structure, the straight flexible pipe 51 bypasses the filament laying bracket 41 backward (the lower end is forward) and is fixed on the second walkway 8. One of the bifurcated pipes of the three-way flexible pipe 52 (directly fixed on the filament laying bracket 41) passes through the filament laying bracket 41 downward, and the other bifurcated pipe (the lower end is backward) bypasses the filament laying bracket 41 forward and is fixed on the first walkway 7. For the auxiliary filament laying structure, the second air blowing pipe 6 (directly fixed on the filament laying bracket 41) passes through the filament laying bracket 41 downward.

[0037] Example 3

[0038] Example 3 provides a preparation device for non-woven fabric, whose structure is basically the same as that of Example 1, except that: the inner diameters of the first air blowing pipe 5, the second air blowing pipe 6 and the air inlet pipe in this example are all 6 mm. The inner diameter of the main air inlet pipe 43 is 8 cm.

[0039] Among them, the "first", "second" and "third" in this example are only for distinction and have no other special meanings.

[0040] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A nonwoven fabric preparation device, comprising a web laying machine and two swinging wire structures (4) arranged side by side in the front and back directions, wherein the web laying machine comprises a web curtain (1) arranged in the front-to-back direction and a main suction air duct (2) and an auxiliary suction air duct (3) arranged side by side in the front and back directions below the web curtain (1); the two swinging wire structures (4) are both located directly above the web curtain (1), and are respectively a main swinging wire structure located directly above the main suction air duct (2) and an auxiliary swinging wire structure located directly above the auxiliary suction air duct (3); The swing wire structure (4) comprises a swing wire support (41) above the net curtain (1), N melt-blowing die head assemblies (42) arranged side by side on the swing wire support (41), a swing plate on the swing wire support (41) and directly below the melt-blowing die head assembly (42), an air inlet main pipe (43) above the swing wire support (41) and two limiting plates (44) at the bottom of the swing wire support (41), the air inlet main pipe (43) and the swing wire support (41) are both arranged in the left and right directions, and N first air outlets are arranged side by side on the air inlet main pipe (43), the air inlet of the melt-blowing die head assembly (42) is connected to the corresponding first air outlet through a pipeline, and the two limiting plates (44) are respectively located above the left and right ends of the net curtain (1); characterized in that The inner upper end, inner front end and inner rear end of the limiting plate (44) of the main swing wire structure are respectively provided with first blowing pipes (5) for blowing downward, backward and forward, and the inner upper end of the limiting plate (44) of the auxiliary swing wire structure is provided with a second blowing pipe (6) for blowing downward, the air inlet end of the first blowing pipe (5) is connected to the air inlet main pipe (43) on the main swing wire structure, and the air inlet end of the second blowing pipe (6) is connected to the air inlet main pipe (43) on the auxiliary swing wire structure.

2. The nonwoven fabric preparation device according to claim 1, characterized in that: The swing wire bracket (41) is a rectangular frame, the air inlet main pipe (43) is located above and in front of the swing wire bracket (41), and the limit plate (44) is arranged obliquely inward from top to bottom and obliquely inward from front to back.

3. The nonwoven fabric preparation device according to claim 2, characterized in that: Both front and rear ends of the lower portion of the limiting plate (44) are curved upward.

4. The device for preparing nonwoven fabric according to claim 2, characterized in that: On the main swing wire structure, N+4 air outlets are arranged side by side on the air inlet main pipe (43), the N air outlets in the middle are used as first air outlets to be connected to N meltblowing die head assemblies (42) respectively, and two first blowing pipes (5) are correspondingly arranged for each limiting plate (44), the two first blowing pipes (5) are respectively a straight hose (51) and a three-way hose (52), and the two air outlets at the end are used as second air outlets to be connected to the air inlet ends of the straight hose (51) and the three-way hose (52) respectively; the air outlet end of the straight hose (51) is located at the inner rear end of the limiting plate (44), and the two air outlet ends of the three-way hose (52) are respectively located at the inner upper end and the inner front end of the limiting plate (44); On the auxiliary swing wire structure, the main air inlet pipe (43) is provided with N+2 air outlets side by side on the left and right, the N air outlets in the middle serve as the first air outlets to be connected to the N meltblowing die head assemblies (42) respectively, and the one air outlet at the end serves as the third air outlet to be connected to the air inlet end of the second blowing pipe (6) of the limiting plate (44) at the corresponding end.

5. The device for preparing nonwoven fabric according to claim 4, characterized in that: The second air outlet and the third air outlet are both provided with a first valve; the air inlet end of the three-way hose (52) is connected to the second air outlet, the lower end of one of the bifurcated pipes is located at the inner upper end of the limiting plate (44), and the second valve is provided on the other bifurcated pipe and the lower end thereof is located at the inner front end of the limiting plate (44).

6. The device for preparing nonwoven fabric according to claim 5, characterized in that: A first walking frame (7) is provided in front of the main swing wire structure, a third walking frame (9) is provided behind the auxiliary swing wire structure, a second walking frame (8) is provided between the main swing wire structure and the auxiliary swing wire structure, and the first walking frame (7), the second walking frame (8) and the third walking frame (9) are all arranged in the left-right direction and are all located above the net curtain (1); For the main swing wire structure, the straight hose (51) bypasses the swing wire bracket (41) backward and is fixed on the second walking frame (8); one fork of the three-way hose (52) passes downward through the swing wire bracket (41), and the other fork of the three-way hose (52) bypasses the swing wire bracket (41) forward and is fixed on the first walking frame (7); For the auxiliary swing wire structure, the second blowing pipe (6) passes downward through the swing wire bracket (41).

7. The device for preparing nonwoven fabric according to claim 1, characterized in that: The outer side of the limiting plate (44) is adjustably arranged at the bottom of the swing wire bracket (41) through a mounting bracket (10), and the mounting bracket (10) includes two transverse fixing rods arranged side by side front and back on the outer side of the limiting plate (44), two vertical fixing rods arranged side by side front and back at the bottom of the swing wire bracket (41), longitudinal fixing rods arranged in the front and back directions at the lower part of the two vertical fixing rods, and support rings located at the lower part of the vertical fixing rods and at the lower side of the longitudinal fixing rods; the transverse fixing rods are arranged in the left and right directions, and are provided with oblong holes in the direction in which they are located, and are fixed to the upper side of the longitudinal fixing rods by vertical locking bolts passing through the oblong holes downwards; the vertical fixing rods are arranged vertically, and the longitudinal fixing rods and the support rings can be adjusted up and down on the vertical fixing rods and are locked respectively by transverse locking bolts.

8. The device for preparing nonwoven fabric according to claim 7, characterized in that: The transverse fixing rod is a horizontal plate, the vertical fixing rod is a round rod, the longitudinal fixing rod and the support ring are both provided with round holes for the vertical fixing rod to pass through, and the transverse locking bolts are arranged in the left and right directions and are arranged on the outside of the longitudinal fixing rod or the support ring.

9. The device for preparing nonwoven fabric according to claim 1, characterized in that: The inner diameters of the first blowing pipe (5) and the second blowing pipe (6) are 4-10 mm.

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