Spun-bonded non-woven fabric production equipment and process based on large experiment machine

Abstract

The invention relates to the technical field of spunbond non-woven fabric production, in particular to spunbond non-woven fabric production equipment and process based on a large-scale experiment machine, and the equipment comprises a rack, an extruder, a spinning manifold, a side blowing air window, a drafting device, a yarn swinging device, a web former, a hot roller and a winding machine. The drafting device comprises a shell, an adjusting assembly and two adjusting plate sets, each adjusting plate set is composed of sealing cloth on the inner layer and an outer pop-up frame on the outer layer, adjusting openings are formed in the two sides of the shell in a penetrating mode, the parts, located below the adjusting openings, of the outer pop-up frames are fixedly connected to the inner wall of the shell, and the rest parts of the outer pop-up frames are in sliding sealing with the shell. The slit type drafting system is small in overall occupied area and low in debugging cost, and experiment cost is saved; meanwhile, by means of the special design that the upper portion of the drafting device is wide and the lower portion of the drafting device is narrow, the slit type drafting process of raw material segmented stretching is achieved, when the non-woven fabric process is updated and the raw material ratio is changed, small-amount rapid trial-manufacturing can be conducted through the adjustable drafting device, and the experiment efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spunbond nonwoven fabric production, in particular to a spunbond nonwoven fabric production equipment and process based on a large experimental machine. BACKGROUND

[0002] As an important nonwoven fabric material, spunbond nonwoven fabric is widely used in medical health, environmental protection, filtration, packaging, construction, automobile and other fields. With the diversification of market demand and the continuous improvement of product performance, the production technology and process of spunbond nonwoven fabric are continuously developed and optimized. The traditional spunbond process has gradually failed to meet the requirements of nonwoven fabric material performance and quality, therefore, developing efficient, accurate and controllable production process has become the focus of research.

[0003] Traditional spunbond nonwoven fabric production mostly uses wide airflow drafting, which has problems such as uneven fiber distribution and low fineness control precision. Although some improved processes use multi-stage drafting, they still face the problems of high energy consumption and single fiber orientation. The Chinese patent application with publication number CN107022842A discloses a double die composite interlaced bicomponent spunbond hydroentangled nonwoven fabric production equipment, which includes a laying machine, a tubular stretching mechanism and a long slot stretching mechanism on the laying machine; the tubular stretching mechanism includes, from top to bottom, a melt spinning small component composite die head, a unidirectional side blowing device, a drafting head, a stainless steel drafting pipe, a yarn guide, and a guide device; the long slot stretching structure includes, from top to bottom, a melt spinning large component composite die head, a bidirectional side blowing device, and a long slot negative pressure stretching device. The tubular stretching mechanism and the long slot stretching mechanism of the patent both use negative pressure drafting, which cannot accurately control the stretching and fineness of the fibers, affecting the uniformity of the finished fibers. At the same time, the specifications of the drafting mechanism are fixedly designed and cannot be adjusted according to the process, so the application range is limited, especially when the nonwoven fabric process is updated and the raw material ratio is changed, the drafting device structure needs to be changed at the same time, which is high in experimental cost and low in experimental efficiency. SUMMARY

[0004] The present application provides a spunbond nonwoven fabric production equipment and process based on a large experimental machine.

[0005] In order to achieve the above-mentioned purposes, the present application specifically adopts the following technical solutions: A kind of based on large-scale experimental machine's spun-bonded nonwoven fabric production equipment, including rack, extruder, spinning beam, side blowing window, draft, swing wire, web former, hot calender and winding machine, the extruder and spinning beam are installed at the top of rack, the spinning beam is set at the outlet of extruder;The side blowing window, draft, swing wire and web former are sequentially installed from top to bottom in the inside of rack, and side blowing window is located directly below spinning beam, the winding machine is set at the left side of web former, the hot calender is set at the left end outlet of web former, the right side of web former is provided with negative pressure fan, the front of negative pressure fan is provided with high pressure fan; The draft includes shell, adjusting assembly and two sets of adjusting plate groups, the two sets of adjusting plate groups are symmetrically arranged about the center of shell, the adjusting plate group is composed of sealing cloth in inner layer and outer elastic frame in outer layer, adjusting port is opened through the two sides of shell, the part of outer elastic frame below adjusting port is fixedly connected to the inner wall of shell, the rest of outer elastic frame is slidingly sealed with shell, a plurality of vertical elastic strips are arranged in the inner part of outer elastic frame, the adjusting assembly can change the bending position of vertical elastic strip.

[0006] Further, the adjusting assembly includes lifting frame sleeved on the outside of shell, the lifting frame can be lifted along the shell, two sets of adjusting shafts are arranged in the inner part of lifting frame, a plurality of guide grooves are opened on the outer surface of adjusting shaft, the guide grooves are correspondingly arranged with vertical elastic strips and the vertical elastic strips are clamped in the guide grooves, the vertical elastic strips can slide along the guide grooves, the upper half of outer elastic frame is provided with flow guide box, the outlet of flow guide box is located on the inner side of sealing cloth, the flow guide box and high pressure fan are connected through air inlet pipe and electromagnetic valve one.

[0007] Further, two sets of inner rotating frames are arranged on the two sides of inner wall of lifting frame, a plurality of mounting grooves are opened on the outer surface of adjusting shaft, the two sets of inner rotating frames on the same side are sleeved in the corresponding mounting grooves, the two ends of adjusting shaft are in contact with the inner wall of lifting frame, the guide groove is composed of guide groove and two sets of pressing strips, the top ends of two sets of pressing strips are welded on the two sides of guide groove, the pressing strips clamp the vertical elastic strips in the guide groove, a connecting plate is arranged below adjusting shaft, the connecting plate is fixedly connected to the bottom of corresponding plurality of pressing strips, a sliding column is arranged on the top of connecting plate, the sliding column is slidingly connected to the inner wall of lifting frame, and a supporting spring is arranged between the sliding column and the inner wall of lifting frame.

[0008] Further, two sets of inner supports are arranged on the inner wall of lifting frame, a driving wheel and a transmission wheel that are intermeshed are rotatably installed in the inner part of inner support, a plurality of tooth grooves are opened on the outer surface of adjusting shaft, the transmission wheel is intermeshed with the tooth groove, a shaft hole is opened in the inner part of driving wheel, an adjusting rod is inserted into the inner part of shaft hole, a groove is opened in the inner wall of shaft hole, a transmission convex strip is arranged on the outer side of adjusting rod, the transmission convex strip is slidingly connected in the groove, one end of adjusting rod close to inner rotating frame is provided with screw rod, the screw rod is screwedly connected in inner rotating frame.

[0009] Further, the diameters of the driving wheel and the transmission wheel are smaller than the inner diameter of the gear slot.

[0010] Further, the outer side of the shell is rotationally connected with a lifting screw driven by a lifting motor, the lifting motor is fixedly installed on the shell, and the outer side of the lifting frame is provided with a lifting nut in threaded connection with the lifting screw.

[0011] Further, the side, away from the lifting screw, of the shell is fixedly installed with a lifting guide column, and the side, away from the lifting screw, of the lifting frame is provided with a guide sleeve, and the lifting guide column is slidably penetrated through the guide sleeve.

[0012] Further, the sealing edge bag is arranged at the contact end of the sealing cloth and the inner wall of the shell, and the outer side of the air inlet pipe is provided with a branch pipe in communication with the sealing edge bag through the electromagnetic valve two.

[0013] Further, the inner wall of the shell is provided with an inner sliding groove, a plurality of blocking strips are slidably connected in the inner sliding groove, the blocking strips are horizontally distributed, a frictional damping is arranged between the blocking strips and the inner sliding groove, and the blocking strips are pressed against the outer side of the vertical elastic strips.

[0014] A spun-bond non-woven fabric production process based on a large experimental machine, comprising the following steps: S1, raw materials are added to an extruder, and the raw materials are heated and melted in the extruder; S2, the melted raw materials are extruded into fiber filaments through a spinning box; S3, the fiber filaments obtained in step S2 are cooled through a side-blowing window and then enter a drafting device, a high-pressure fan blows high-pressure air into a flow guide box through an air inlet pipe, and then blows the high-pressure air to between two groups of adjusting plates through the flow guide box, and the fiber filaments vertically pass through the slits between the two groups of adjusting plates to complete high-pressure slit drafting; meanwhile, a plurality of vertical elastic strips in an outer elastic frame can change the bending positions through an adjusting assembly, so that the drafting device has different sections and realizes different stretching forces, each section can apply different air pressures to the fiber filaments to gradually complete the stretching process of the fiber filaments, realize sectional stretching of the fiber filaments, and the fiber filaments are drafted into fine filaments through the drafting device; S4, the fine filaments obtained in step S3 enter a fiber web swinging device, the fiber web swinging device swings the fine filaments into a fiber web; then, the fiber web enters a web former; S5, a negative pressure fan provides negative pressure air to the web former, and the web former adheres the fiber web to a screen curtain by the negative pressure air and conveys the fiber web to a hot calender roller, and the hot calender roller solidifies the fiber web into spun-bond non-woven fabric by pressing and heating; S6, finally, the spun-bond non-woven fabric is wound up through a winding machine.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The present application adopts a slit type drafting system to realize fine control of fibers, effectively solving the problems of uneven fiber fineness, high drafting energy consumption, large differences in product longitudinal and transverse strength, etc. in the existing anti-sticking process, significantly improving product uniformity and mechanical properties. A large-scale spun-bond experimental machine is developed to reduce the cost of production line variety switching and debugging, adopts a three-dimensional working mode, occupies only 80m 2 , and has a width of 60cm, greatly saving experimental costs and greatly improving work efficiency.

[0016] 2. The present application adopts a slit type drafting process to realize rapid trial production of a weight of 10-200g / m 2 , compared with traditional equipment, experimental cost is reduced by 90%, variety switching and debugging cycle is shortened by 80%, and when the non-woven fabric process is updated and the raw material ratio is changed, a small amount of rapid trial production can be carried out through adjustable drafting device setting, and the experimental efficiency is high.

[0017] 3. The present application adopts a special design of drafting device with wide top and narrow bottom to realize segmented stretching, different stretching forces are realized in different segments, different air pressures are applied to the material in each segment, the stretching process is gradually realized, the stress of each part of the material can be ensured to be uniform, which helps to improve the uniformity and quality of the final product. DETAILED DESCRIPTION

[0018] Figure 1 is a structural schematic diagram of the large-scale spun-bond experimental machine of the present application; Figure 2 is a position schematic diagram of the outer shell and lifting guide column in the drafting device of the present application; Figure 3 is a position schematic diagram of the outer shell and lifting lead screw in the drafting device of the present application; Figure 4 is an exploded view of the drafting device of the present application; Figure 5 is a structural schematic diagram of Figure 4 the outer shell; Figure 6 is a structural schematic diagram of the adjusting assembly in the drafting device of the present application; Figure 7 is a structural schematic diagram of the adjusting plate group in the drafting device of the present application.

[0019] Reference numerals: 1, extruder; 2, spinning box; 3, side blowing window; 4, high-pressure fan; 5, drafting device; 6, oscillating device; 7, web forming machine; 8, hot rolling roller; 9, winder; 10, negative pressure fan; 51, housing; 52, adjustment component; 53, adjustment plate group; 54, lifting screw; 55, lifting guide column; 56, inner slide; 57, stop bar; 510, inner bracket; 511, drive Wheel; 512, transmission wheel; 513, adjustment rod; 521, lifting frame; 522, inner rotating frame; 523, adjustment shaft; 524, guide groove; 525, edge pressure strip; 526, connecting plate; 527, sliding column; 528, tension spring; 529, tooth groove; 531, sealing cloth; 532, outer spring frame; 533, sealing side bag; 534, guide box; 535, intake pipe; 536, branch pipe. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0021] Example 1, as Figures 1-7 As shown, the present invention provides a spunbond non-woven fabric production equipment based on a large experimental machine, including a frame, an extruder 1 is installed on the top of the frame, a spinning box 2 is provided at the outlet of the extruder 1, and a side blowing window 3, a drafter 5, a swinging device 6 and a web forming machine 7 are installed in sequence from top to bottom inside the frame, and the side blowing window 3 is located directly below the spinning box 2, a winder 9 is provided on the left side of the web forming machine 7, a hot rolling roller 8 is provided at the left end outlet of the web forming machine 7, a negative pressure fan 10 is provided on the right side of the web forming machine 7, and a high-pressure fan 4 is provided in front of the negative pressure fan 10; The stretcher 5 includes an outer shell 51, an adjustment component 52 and two groups of adjustment plate groups 53. The two groups of adjustment plate groups 53 are symmetrically arranged about the center of the outer shell 51. The adjustment plate group 53 consists of an inner layer of sealing cloth 531 and an outer layer of an outer spring frame 532. Adjustment openings are opened on both sides of the outer shell 51. The part of the outer spring frame 532 located below the adjustment opening is fixedly connected to the inner wall of the outer shell 51, and the rest of the outer spring frame 532 is slidably sealed with the outer shell 51. A plurality of groups of vertical spring bars are arranged inside the outer spring frame 532, and the adjustment component 52 can change the bending position of the vertical spring bars.

[0022] The adjusting assembly 52 comprises a lifting frame 521 sleeved outside the shell 51, the lifting frame 521 can be lifted along the shell 51, the inside of the lifting frame 521 is provided with two groups of adjusting shafts 523, the outer surface of the adjusting shaft 523 is provided with a plurality of guide grooves, the guide grooves are correspondingly provided with vertical elastic strips and the vertical elastic strips are clamped in the guide grooves, the vertical elastic strips can slide along the guide grooves, the upper half of the outer elastic frame 532 is provided with a flow guide box 534, the outlet of the flow guide box 534 is located inside the sealing cloth 531, the flow guide box 534 and the high-pressure fan 4 are connected through the air inlet pipe 535 and the electromagnetic valve one.

[0023] The large-scale spun-bond experimental machine in the embodiment reduces the cost of switching and debugging of the production line for non-woven fabric varieties, adopts a three-dimensional working mode, occupies only 80 m 2 , and has a width of 60 cm, thereby greatly saving production cost and greatly improving work efficiency.

[0024] The vertical elastic strip expands outward after passing through the guide groove, as shown in Figure 4 , and the two groups of adjusting plate groups 53 form a structure that is wide at the top and narrow at the bottom. In use, the high-pressure fan 4 blows high-pressure air into the flow guide box 534 through the air inlet pipe 535, and then blows it to the space between the two groups of adjusting plate groups 53, and the fiber yarn also passes vertically through the gap between the two groups of adjusting plate groups 53, realizing high-pressure gap drafting; at the same time, different stretching forces are realized at different sections, each section applies different air pressure to the material, gradually realizing the stretching process, which can ensure that each part of the material is evenly stressed, helping to improve the uniformity and quality of the final product, and realizing segmented stretching.

[0025] When changing experimental data, the lifting frame 521 is lifted to drive the adjusting shaft 523 to lift, the adjusting shaft 523 changes the bending position of the vertical elastic strip, and then changes the segmented position, which can be suitable for different materials.

[0026] In the above embodiment, the two sides of the inner wall of the lifting frame 521 are provided with two groups of inner rotating frames 522, the outer surface of the adjusting shaft 523 is provided with two groups of mounting grooves, the same side two groups of inner rotating frames 522 are sleeved in the corresponding mounting grooves, the two ends of the adjusting shaft 523 abut against the inner wall of the lifting frame 521, the guide groove is composed of a guide groove 524 and two groups of edge pressing strips 525, the top end of the two groups of edge pressing strips 525 is welded on the two sides of the guide groove 524, the edge pressing strip 525 clamps the vertical elastic strip in the guide groove 524, the lower side of the adjusting shaft 523 is provided with a connecting plate 526, the connecting plate 526 is fixedly connected to the bottom of the corresponding plurality of edge pressing strips 525; the top of the connecting plate 526 is provided with a sliding column 527, the sliding column 527 is slidingly connected to the inner wall of the lifting frame 521, and a tension spring 528 is arranged between the sliding column 527 and the inner wall of the lifting frame 521.

[0027] By controlling the rotation of the adjusting shaft 523,Figure 6 As shown, taking the right adjusting shaft 523 as an example, when the adjusting shaft 523 rotates clockwise, the adjusting shaft 523 winds the pressing strip 525, at this time, the outlet inclination angle of the upper end of the pressing strip 525 and the guide groove 524 increases, the outlet inclination angle is the included angle between the upper end of the pressing strip 525 and the vertical plane, the pressing strip 525 drives the connecting plate 526 to rise, the supporting spring 528 applies a downward pushing force to the connecting plate 526 through the sliding column 527, so that the lower half of the pressing strip 525 remains vertical, and the upper half of the pressing strip 525 is tightly attached to the guide groove 524, so as to stably clamp the vertical elastic strip, at this time, the opening of the adjusting plate group 53 increases, the width of the upper half increases, and the segmented gradual strength is changed; similarly, when the adjusting shaft 523 rotates counterclockwise, the outlet inclination angle of the upper end of the pressing strip 525 and the guide groove 524 decreases, the opening of the adjusting plate group 53 decreases, the width of the upper half decreases, so that the segmented strength of the drafting device 5 can also be adjusted according to requirements, and the application range is wider.

[0028] In the embodiment, the inner wall of the lifting frame 521 is provided with two groups of inner supports 510, the inner supports 510 are rotatably installed with driving wheels 511 and transmission wheels 512 which are mutually engaged, the outer surface of the adjusting shaft 523 is provided with a gear groove 529, the transmission wheel 512 is engaged with the gear groove 529, the inner part of the driving wheel 511 is provided with an axle hole, the inside of the axle hole is slidably connected with an adjusting rod 513, one end of the adjusting rod 513 close to the inner rotating frame 522 is provided with a screw rod, and the screw rod is threadedly connected in the inner rotating frame 522.

[0029] Further, the radii of the driving wheel 511 and the transmission wheel 512 are all smaller than the inner diameter of the gear groove 529.

[0030] By rotating the adjusting rod 513, the adjusting rod 513 drives the driving wheel 511 to rotate, the driving wheel 511 drives the transmission wheel 512 to rotate, and the transmission wheel 512 drives the adjusting shaft 523 to rotate through the gear groove 529; at the same time, the adjusting rod 513 is screwed into or out of the inner rotating frame 522 under the action of the screw rod, and the adjusting rod 513 slides relative to the driving wheel 511, so that the adjusting shaft 523 does not rotate under the action of the thread self-locking when the adjusting rod 513 does not rotate, and the guidance is stable.

[0031] In the embodiment, the outer side of the shell 51 is fixedly installed with a lifting motor, the driving end of the lifting motor is fixedly installed with a lifting lead screw 54, the outer side of the lifting frame 521 is provided with a lifting nut, the lifting nut is threadedly connected with the lifting lead screw 54, the lifting lead screw 54 is rotatably connected with the shell 51 through a bearing seat, and the bearing seat is fixed on the shell 51. Preferably, the lifting motor is located at the top of the lifting lead screw 54, and the bearing seat is installed at the bottom of the lifting lead screw 54; the bottom end of the lifting lead screw 54 and the bottom of the adjusting opening are at the same height.

[0032] Further, the housing 51 is fixedly installed with a lifting guide column 55 away from one side of the lifting lead screw 54, and the lifting frame 521 is provided with a guide sleeve away from one side of the lifting lead screw 54. The lifting guide column 55 slides through the guide sleeve.

[0033] By controlling the operation of the lifting motor, the lifting motor drives the lifting lead screw 54 to rotate, and the lifting lead screw 54 drives the lifting frame 521 to lift through the lifting nut. Under the action of the lifting guide column 55 and the guide sleeve, the lifting frame 521 stably lifts.

[0034] In the above embodiment, the sealing edge bag 533 is provided on the contact end of the inner wall of the housing 51, the outer side of the air inlet pipe 535 is provided with a branch pipe 536, and the branch pipe 536 is connected with the sealing edge bag 533 through the electromagnetic valve two.

[0035] During adjustment, the sealing edge bag 533 is deflated, and after adjustment is completed, the sealing edge bag 533 is inflated to improve the sealing between the adjustment plate group 53 and the housing 51, and the sealing air pressure is the same as the draft air pressure, so as to reduce the possibility of air leakage.

[0036] In the above embodiment, the inner wall of the housing 51 is provided with an inner sliding groove 56, a plurality of blocking strips 57 are slidably connected in the inner sliding groove 56, the blocking strips 57 are horizontally distributed, a friction damping is arranged between the blocking strips 57 and the inner sliding groove 56, and the blocking strips 57 are pressed on the outer side of the vertical elastic strips.

[0037] During adjustment, the gap between the lower half of the adjustment plate group 53 is small, and the pressure is large, so that the blocking strips 57 are horizontally distributed and pressed on the outer side of the vertical elastic strips, which can prevent the lower half of the adjustment plate group 53 from deforming, and the blocking strips 57 can slide up and down in the inner sliding groove 56. Before the adjustment assembly 52 moves downward, the blocking strips 57 are pushed downward, so that the adjustment assembly 52 has sufficient downward adjustment range.

[0038] In the above embodiment, the production experiment process of the spun-bonded non-woven fabric includes the following steps: S1, the raw material is added to the extruder 1, and the raw material is heated and melted in the extruder 1; S2, the melted raw material is extruded into fiber yarn through the spinning box 2; S3, the fiber yarn obtained in step S2 is cooled by the side blowing window 3 and then enters the drafting device 5, the high-pressure fan 4 blows high-pressure air into the guide box 534 through the air inlet pipe 535, and then blows the high-pressure air to the two sets of adjusting plate groups 53 through the guide box 534, and the fiber yarn vertically passes through the gap between the two sets of adjusting plate groups 53, and high-pressure gap drafting is completed; at the same time, the multiple sets of vertical elastic strips in the outer elastic frame 532 can change the bending position through the adjusting assembly 52, so that the drafting device 5 has different sections and realizes different stretching forces, each section can exert different air pressure on the fiber yarn, so as to gradually complete the stretching process of the fiber yarn, realize the segmented stretching of the fiber yarn, and the fiber yarn is stretched into a filament through the drafting device 5; S4, the filament obtained in step S3 enters the filament swinging device 6, the filament swinging device 6 swings the filament into a fiber web; then, the fiber web enters the web former 7; S5, the negative pressure fan 10 provides negative pressure air to the web former 7, the web former 7 adheres the fiber web to the screen curtain by using the negative pressure air and conveys the fiber web to the hot calender 8, and the hot calender 8 solidifies the fiber web into a spunbond nonwoven fabric by pressing and heating; S6, finally, the spunbond nonwoven fabric is wound by the winding machine 9.

[0039] The present application adopts a slit type drafting system, realizes fine control of fibers, effectively solves the problems of uneven fiber fineness, high drafting energy consumption and large difference between longitudinal and transverse strength of products in the existing anti-sticking process, and significantly improves the uniformity and mechanical properties of the products.

[0040] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spunbond nonwoven fabric production equipment based on a large experimental machine, comprising a frame, an extruder (1), a spinning box (2), a side blowing window (3), a drafter (5), a swaying device (6), a web forming machine (7), a hot rolling roller (8) and a winder (9), characterized in that: The extruder (1) and the spinning box (2) are installed on the top of the frame, and the spinning box (2) is arranged at the outlet of the extruder (1); the side blowing window (3), the drafting device (5), the oscillating device (6) and the web forming machine (7) are installed in the frame from top to bottom, and the side blowing window (3) is located directly below the spinning box (2); the winder (9) is arranged on the left side of the web forming machine (7); the hot rolling roller (8) is arranged at the left end outlet of the web forming machine (7); a negative pressure fan (10) is arranged on the right side of the web forming machine (7); and a high pressure fan (4) is arranged in front of the negative pressure fan (10); The drafter (5) comprises a shell (51), an adjustment assembly (52) and two groups of adjustment plate groups (53). The two groups of adjustment plate groups (53) are symmetrically arranged about the center of the shell (51). The adjustment plate group (53) consists of an inner sealing cloth (531) and an outer elastic frame (532). Adjustment openings are provided on both sides of the shell (51). The portion of the outer elastic frame (532) located below the adjustment opening is fixedly connected to the inner wall of the shell (51). The remaining portion of the outer elastic frame (532) is slidably sealed with the shell (51). Multiple groups of vertical elastic bars are arranged inside the outer elastic frame (532); the adjustment assembly (52) is used to change the bending position of the vertical elastic bars.

2. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 1, characterized in that: The adjustment assembly (52) includes a lifting frame (521) sleeved on the outside of the shell (51), and the lifting frame (521) can be lifted and lowered along the shell (51). Two groups of adjustment shafts (523) are provided inside the lifting frame (521), and the outer surface of the adjustment shaft (523) is provided with multiple groups of guide grooves, which are correspondingly provided with vertical elastic bars and the vertical elastic bars are clamped in the guide grooves. The vertical elastic bars can slide along the guide grooves. The upper part of the outer elastic frame (532) is provided with a guide box (534), and the outlet of the guide box (534) is located on the inner side of the sealing cloth (531). The guide box (534) and the high-pressure blower (4) are connected to the electromagnetic valve through the air inlet pipe (535).

3. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 2, characterized in that: Two sets of inner rotating frames (522) are provided on both sides of the inner wall of the lifting frame (521), and two sets of mounting grooves are provided on the outer surface of the adjusting shaft (523). The two sets of inner rotating frames (522) on the same side are sleeved in the corresponding mounting grooves. Both ends of the adjusting shaft (523) touch the inner wall of the lifting frame (521). The guide groove is composed of a guide groove (524) and two sets of pressure strips (525). The top ends of the two sets of pressure strips (525) are welded to the guide groove (524). 24), the edge pressure strips (525) clamp the vertical spring strips in the guide grooves (524), and a connecting plate (526) is provided below the adjusting shaft (523). The connecting plate (526) is fixedly connected to the bottoms of the corresponding multiple groups of edge pressure strips (525). A sliding column (527) is provided on the top of the connecting plate (526). The sliding column (527) is slidably connected to the inner wall of the lifting frame (521), and a tension spring (528) is provided between the sliding column (527) and the inner wall of the lifting frame (521).

4. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 3, characterized in that: The inner wall of the lifting frame (521) is provided with two groups of inner brackets (510), and the inner brackets (510) are rotatably installed with a driving wheel (511) and a transmission wheel (512) that mesh with each other. The outer surface of the adjusting shaft (523) is provided with a tooth groove (529), and the transmission wheel (512) meshes with the tooth groove (529). The driving wheel (511) is provided with an axial hole, and an adjusting rod (513) is inserted into the axial hole. The inner wall of the axial hole is provided with a groove, and a transmission ridge is provided on the outer side of the adjusting rod (513), and the transmission ridge is slidably connected in the groove. A screw is provided at one end of the adjusting rod (513) close to the inner rotating frame (522), and the screw is threadedly connected to the inner rotating frame (522).

5. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 4, characterized in that: The diameters of the driving wheel (511) and the transmission wheel (512) are both smaller than the inner diameter of the tooth groove (529).

6. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 5, characterized in that: The outer side of the housing (51) is rotatably connected to a lifting screw (54) driven by a lifting motor, the lifting motor being fixedly mounted on the housing (51), and the outer side of the lifting frame (521) is provided with a lifting nut, which is threadably connected to the lifting screw (54).

7. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 6, characterized in that: A lifting guide column (55) is fixedly mounted on a side of the housing (51) away from the lifting screw (54), and a guide sleeve is provided on a side of the lifting frame (521) away from the lifting screw (54), and the lifting guide column (55) slides through the guide sleeve.

8. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 7, characterized in that: A sealing side bag (533) is provided at the contact end of the sealing cloth (531) and the inner wall of the housing (51), and a branch pipe (536) is provided on the outside of the air intake pipe (535). The branch pipe (536) is connected to the sealing side bag (533) through a second solenoid valve.

9. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 8, characterized in that: An inner sliding groove (56) is provided on the inner wall of the outer shell (51), and a plurality of groups of retaining bars (57) are slidably connected to the inner portion of the inner sliding groove (56). The retaining bars (57) are horizontally distributed, and friction damping is provided between the retaining bars (57) and the inner sliding groove (56). The retaining bars (57) are pressed against the outer side of the vertical elastic bars.

10. A spunbond nonwoven fabric production process based on a large-scale experimental machine, using the spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 9, characterized in that: The following steps are involved: S1, adding raw materials into the extruder (1), and heating and melting the raw materials in the extruder (1); S2, the melted raw material is extruded into fiber filaments through a spinning manifold (2); S3, the fiber filaments obtained in step S2 are cooled through the side blowing window (3), and then enter the stretcher (5), and the high-pressure fan (4) blows the high-pressure air into the guide box (534) through the air inlet pipe (535), and then blows the high-pressure air through the guide box (534) to between the two groups of adjustment plate groups (53), and the fiber filaments vertically pass through the slit between the two groups of adjustment plate groups (53), completing the high-pressure slit stretching; at the same time, the multiple groups of vertical elastic bars in the outer elastic frame (532) can change the bending position through the adjustment component (52), so that the stretcher (5) has different segments and achieves different stretching forces, and each segment will apply different wind pressure to the fiber filaments, so as to gradually complete the stretching process of the fiber filaments, and realize the segmented stretching of the fiber filaments, until the fiber filaments are stretched into filaments through the stretcher (5); S4, the filaments obtained in step S3 enter the filament swinging device (6), and the filament swinging device (6) swings the filaments into a fiber web; then, the fiber web enters the web forming machine (7); S5, the negative pressure blower (10) provides negative pressure air to the web forming machine (7), and the web forming machine (7) uses the negative pressure air to attach the fiber web to the mesh curtain and transport it to the hot calendering roller (8), and the hot calendering roller (8) consolidates the fiber web into a spunbond nonwoven fabric by applying pressure and heat; S6. Finally, the spunbond nonwoven fabric is wound up by a winder (9).

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