A production equipment and process for spunbond nonwoven fabric based on a large-scale testing machine

Abstract

This invention relates to the field of spunbond nonwoven fabric production technology, specifically to a spunbond nonwoven fabric production equipment and process based on a large-scale experimental machine. The equipment includes a frame, extruder, spinning box, side-blowing windows, drafter, yarn arranger, web forming machine, hot rollers, and winding machine. The drafter comprises a shell, an adjustment assembly, and two sets of adjustment plates. Each adjustment plate consists of an inner sealing cloth and an outer elastic frame. Adjustment openings are provided on both sides of the shell. The portion of the outer elastic frame located below the adjustment openings is fixedly connected to the inner wall of the shell, while the remaining portion slides and seals with the shell, thus forming a slit-type drafting system. This system has a small footprint, low setup cost, and saves on experimental costs. Furthermore, this invention utilizes a special design of the drafter—wider at the top and narrower at the bottom—to achieve a slit-type drafting process for segmented stretching of raw materials. When nonwoven fabric processes are updated or raw material ratios change, the adjustable drafter settings enable rapid small-scale trial production, resulting in high experimental efficiency.

Description

Technical Field

[0001] This invention relates to the field of spunbond nonwoven fabric production technology, specifically to a spunbond nonwoven fabric production equipment and process based on a large-scale experimental machine. Background Technology

[0002] Spunbond nonwoven fabrics, as an important nonwoven material, are widely used in medical and health, environmental protection, filtration, packaging, construction, automotive, and other fields. With the diversification of market demands and the continuous improvement of product performance, the production technology and processes of spunbond nonwoven fabrics are constantly developing and optimizing. Traditional spunbonding processes are gradually failing to meet the requirements for the performance and quality of nonwoven fabric materials; therefore, developing efficient, precise, and controllable production processes has become a key research focus.

[0003] Traditional spunbond nonwoven fabric production often employs wide-width airflow drafting, which suffers from uneven fiber distribution and low precision in fineness control. Although some improved processes utilize multi-stage drafting, they still face drawbacks such as high energy consumption and uniform fiber orientation. Chinese invention patent application CN107022842A discloses a dual-die-head composite interlaced bicomponent spunbond hydroentangled nonwoven fabric production equipment, including a web-laying machine with a tubular stretching mechanism and a long slit stretching mechanism. The tubular stretching mechanism, from top to bottom, includes a melt spinning small component composite die, a unidirectional side-blowing device, a drafting head, a stainless steel drafting tube, a yarn arranging machine, and a guiding device. The long slit stretching mechanism, from top to bottom, includes a melt spinning large component composite die, a bidirectional side-blowing device, and a long slit negative pressure stretching device. Both the tubular stretching mechanism and the long slit stretching mechanism in this patent employ negative pressure drafting, which cannot precisely control fiber stretching and fineness, affecting the uniformity of the finished fiber. Meanwhile, the specifications of the stretching mechanism are fixed designs and cannot be adjusted according to the actual process, which limits its applicability. In particular, when the nonwoven fabric process is updated or the raw material ratio changes, the structure of the stretcher needs to be changed at the same time, resulting in high experimental costs and low experimental efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a spunbond nonwoven fabric production equipment and process based on a large-scale experimental machine to solve the above problems.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] A spunbond nonwoven fabric production equipment based on a large-scale experimental machine includes a frame, an extruder, a spinning box, a side-blowing window, a drafter, a yarn manipulator, a web forming machine, a hot roller, and a winding machine. The extruder and the spinning box are installed on the top of the frame, with the spinning box located at the outlet of the extruder. The side-blowing window, drafter, yarn manipulator, and web forming machine are installed sequentially from top to bottom inside the frame, with the side-blowing window located directly below the spinning box. The winding machine is located on the left side of the web forming machine, and the hot roller is located at the left end outlet of the web forming machine. A negative pressure fan is located on the right side of the web forming machine, and a high-pressure fan is located in front of the negative pressure fan.

[0007] The stretcher includes a housing, an adjustment assembly, and two sets of adjustment plates. The two sets of adjustment plates are symmetrically arranged about the center of the housing. Each adjustment plate consists of an inner sealing cloth and an outer spring frame. Adjustment openings are provided on both sides of the housing. The portion of the outer spring frame located below the adjustment opening is fixedly connected to the inner wall of the housing. The remaining portion of the outer spring frame is slidably sealed with the housing. Multiple sets of vertical spring bars are provided inside the outer spring frame. The adjustment assembly can change the bending position of the vertical spring bars.

[0008] Furthermore, the adjustment assembly includes a lifting frame sleeved on the outside of the housing. The lifting frame can move up and down along the housing. The inside of the lifting frame is provided with two sets of adjustment shafts. Multiple sets of guide grooves are opened on the outer surface of the adjustment shafts. The guide grooves are correspondingly arranged with the vertical spring strips and the vertical spring strips are engaged in the guide grooves. The vertical spring strips can slide along the guide grooves. The upper half of the outer spring frame is provided with a flow guide box. The outlet of the flow guide box is located inside the sealing cloth. The flow guide box and the high-pressure blower are connected to the solenoid valve through an air inlet pipe.

[0009] Furthermore, two sets of internal rotating frames are provided on both sides of the inner wall of the lifting frame, and two sets of mounting grooves are opened on the outer surface of the adjusting shaft. The two sets of internal rotating frames on the same side are sleeved in the corresponding mounting grooves. Both ends of the adjusting shaft abut against the inner wall of the lifting frame. The guide groove is composed of a guide groove and two sets of pressing strips. The top ends of the two sets of pressing strips are welded to both sides of the guide groove. The pressing strips hold the vertical spring strip in the guide groove. A connecting plate is provided below the adjusting shaft. The connecting plate is fixedly connected to the bottom of the corresponding sets of pressing strips. A sliding column is provided at the top of the connecting plate. The sliding column is slidably connected to the inner wall of the lifting frame, and a tension spring is provided between the sliding column and the inner wall of the lifting frame.

[0010] Furthermore, the inner wall of the lifting frame is provided with two sets of inner supports. The inner supports are rotatably mounted with a drive wheel and a transmission wheel that mesh with each other. The outer surface of the adjusting shaft is provided with a toothed groove, and the transmission wheel meshes with the toothed groove. The drive wheel is provided with a shaft hole, and an adjusting rod is inserted into the shaft hole. The inner wall of the shaft hole is provided with a groove. A transmission protrusion is provided on the outer side of the adjusting rod, and the transmission protrusion is slidably connected in the groove. A screw is provided at the end of the adjusting rod near the inner rotating frame, and the screw is threadedly connected in the inner rotating frame.

[0011] Furthermore, the diameters of both the drive wheel and the transmission wheel are smaller than the inner diameter of the tooth groove.

[0012] Furthermore, a lifting screw driven by a lifting motor is rotatably connected to the outer side of the housing. The lifting motor is fixedly installed on the housing. A lifting nut is provided on the outer side of the lifting frame, and the lifting nut is threadedly connected to the lifting screw.

[0013] Furthermore, a lifting guide column is fixedly installed on the side of the outer shell away from the lifting screw, and a guide sleeve is provided on the side of the lifting frame away from the lifting screw, with the lifting guide column sliding through the guide sleeve.

[0014] Furthermore, a sealing edge bladder is provided at the end of the sealing cloth that contacts the inner wall of the outer shell, and a branch pipe is provided on the outside of the air intake pipe, which is connected to the sealing edge bladder through a solenoid valve.

[0015] Furthermore, the inner wall of the outer shell is provided with an inner sliding groove, and multiple sets of baffles are slidably connected inside the inner sliding groove. The baffles are horizontally distributed, and friction damping is provided between the baffles and the inner sliding groove. The baffles press against the outside of the vertical elastic bar.

[0016] A spunbond nonwoven fabric production process based on a large-scale testing machine includes the following steps:

[0017] S1. Add the raw material to the extruder, where it is heated and melted.

[0018] S2. The melted raw material is extruded into fiber filaments through the spinning box;

[0019] S3. The fiber obtained in step S2 is cooled by the side-blowing air window and then enters the stretcher. The high-pressure blower blows high-pressure air into the guide box through the air inlet pipe, and then blows it between the two sets of adjusting plates. The fiber passes vertically through the slit between the two sets of adjusting plates, completing the high-pressure slit stretching. At the same time, the bending position of multiple sets of vertical elastic bars in the outer frame can be changed by the adjustment component, so that the stretcher has different segments and achieves different stretching forces. Each segment will apply different air pressure to the fiber to gradually complete the stretching process of the fiber, realizing the segmented stretching of the fiber until the fiber is stretched into a fine filament through the stretcher.

[0020] S4. The filaments obtained in step S3 enter the filament oscillator, which oscillates the filaments into a fiber web; then, the fiber web enters the web forming machine.

[0021] S5. The negative pressure fan provides negative pressure air to the web forming machine. The web forming machine uses the negative pressure air to attach the fiber web to the screen and convey it to the hot roller. The hot roller solidifies the fiber web into spunbond nonwoven fabric by applying pressure and heating.

[0022] S6. Finally, the spunbond nonwoven fabric is wound up using a winding machine.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention employs a slit-type drafting system to achieve precise fiber control, effectively solving problems such as uneven fiber fineness, high drafting energy consumption, and large differences in longitudinal and transverse strength in existing anti-bonding processes, significantly improving product uniformity and mechanical properties. A large-scale spunbonding testing machine has been developed to reduce the cost of switching and adjusting nonwoven fabric types on the production line. It adopts a three-dimensional working mode, occupying only 80m² of space. 2 With a width of 60cm, it greatly reduces experimental costs and significantly improves work efficiency.

[0025] 2. This invention employs a slit-type drawing process, which can achieve a basis weight of 10-200 g / m³. 2 Compared to traditional equipment, the rapid trial production of this equipment reduces experimental costs by 90% and shortens the product switching and debugging cycle by 80%. Furthermore, when nonwoven fabric processes are updated or raw material ratios change, the adjustable stretcher settings enable rapid trial production of small quantities, resulting in high experimental efficiency.

[0026] 3. This invention adopts a special design of the stretcher that is wider at the top and narrower at the bottom to achieve segmented stretching. Different stretching forces are achieved in different segments, and different air pressures are applied to the material in each segment to gradually achieve the stretching process. This can ensure that the material in each part is subjected to uniform stress, which helps to improve the uniformity and quality of the final product. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the large-scale spunbond experimental machine of the present invention;

[0028] Figure 2 This is a schematic diagram showing the positions of the outer shell and the lifting guide column in the stretcher of the present invention;

[0029] Figure 3 This is a schematic diagram showing the positions of the outer shell and the lifting screw in the stretcher of the present invention;

[0030] Figure 4 This is an exploded view of the stretcher of the present invention;

[0031] Figure 5 yes Figure 4 Schematic diagram of the inner and outer shell structure;

[0032] Figure 6 This is a schematic diagram of the adjustment component in the stretcher of the present invention;

[0033] Figure 7 This is a schematic diagram of the adjusting plate assembly in the stretcher of the present invention.

[0034] Reference numerals: 1. Extruder; 2. Spinning box; 3. Side air vent; 4. High-pressure blower; 5. Drafter; 6. Yarn oscillator; 7. Web forming machine; 8. Hot rolling roll; 9. Winding machine; 10. Negative pressure blower; 51. Outer shell; 52. Adjustment assembly; 53. Adjustment plate assembly; 54. Lifting screw; 55. Lifting guide column; 56. Inner slide; 57. Stop bar; 510. Inner support; 511. Drive. 512. Wheel; 513. Drive wheel; 524. Adjusting rod; 525. Lifting frame; 526. Inner rotating frame; 527. Adjusting shaft; 528. Guide groove; 529. Pressing edge strip; 520. Connecting plate; 521. Sliding column; 522. Support spring; 533. Tooth groove; 54. Sealing cloth; 55. Outer spring frame; 56. Sealing edge bag; 57. Air guide box; 58. Intake pipe; 59. Branch pipe. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0036] Example 1, as Figures 1-7 As shown, the present invention provides a spunbond nonwoven fabric production equipment based on a large-scale experimental machine, including a frame, an extruder 1 installed on the top of the frame, a spinning box 2 provided at the outlet of the extruder 1, and a side blowing window 3, a stretcher 5, a yarn swivel 6 and a web forming machine 7 installed sequentially from top to bottom inside the frame, with the side blowing window 3 located directly below the spinning box 2, a winding machine 9 provided on the left side of the web forming machine 7, a hot roller 8 provided at the left end outlet of the web forming machine 7, a negative pressure fan 10 provided on the right side of the web forming machine 7, and a high pressure fan 4 provided in front of the negative pressure fan 10;

[0037] The stretcher 5 includes a housing 51, an adjustment assembly 52, and two sets of adjustment plate assemblies 53. The two sets of adjustment plate assemblies 53 are symmetrically arranged about the center of the housing 51. The adjustment plate assembly 53 consists of an inner sealing cloth 531 and an outer spring frame 532. Adjustment openings are provided on both sides of the housing 51. The part of the outer spring frame 532 located below the adjustment opening is fixedly connected to the inner wall of the housing 51. The remaining part of the outer spring frame 532 is slidably sealed with the housing 51. Multiple sets of vertical spring bars are provided inside the outer spring frame 532. The adjustment assembly 52 can change the bending position of the vertical spring bars.

[0038] The adjustment assembly 52 includes a lifting frame 521 sleeved on the outside of the housing 51. The lifting frame 521 can move up and down along the housing 51. The interior of the lifting frame 521 is provided with two sets of adjustment shafts 523. Multiple sets of guide grooves are opened on the outer surface of the adjustment shafts 523. The guide grooves are correspondingly arranged with the vertical spring strips and the vertical spring strips are engaged in the guide grooves. The vertical spring strips can slide along the guide grooves. The upper half of the outer spring 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 blower 4 are connected to the solenoid valve 1 through the air inlet pipe 535.

[0039] The large-scale spunbond testing machine in this embodiment reduces the cost of switching and adjusting nonwoven fabric varieties on the production line. It adopts a three-dimensional working mode and occupies only 80m². 2 With a width of 60cm, it greatly saves production costs and significantly improves work efficiency.

[0040] After the vertical elastic bar passes through the guide groove, it expands outward, such as Figure 4 As shown, the two sets of adjusting plates 53 form a structure that is wider at the top and narrower at the bottom. In use, the high-pressure blower 4 blows high-pressure air into the guide box 534 through the air inlet pipe 535, and then blows it between the two sets of adjusting plates 53 through the guide box 534. The fiber filaments also pass vertically through the narrow gap between the two sets of adjusting plates 53, realizing high-pressure slit stretching. At the same time, different stretching forces are achieved in different sections. Each segment applies different air pressure to the material, gradually realizing the stretching process. This ensures that the material in each part is subjected to uniform stress, which helps to improve the uniformity and quality of the final product and realizes segmented stretching.

[0041] When changing experimental data, the lifting frame 521 is raised and lowered, which in turn drives the adjusting shaft 523 to rise and fall. The adjusting shaft 523 changes the bending position of the vertical spring bar, thereby changing the segment position, which can be applied to different materials.

[0042] Example 2, based on the above example, further includes: two sets of inner rotating brackets 522 are provided on both sides of the inner wall of the lifting frame 521; two sets of mounting grooves are provided on the outer surface of the adjusting shaft 523; the two sets of inner rotating brackets 522 on the same side are sleeved in the corresponding mounting grooves; both 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 sets of pressing strips 525; the top ends of the two sets of pressing strips 525 are welded to both sides of the guide groove 524; the pressing strips 525 hold the vertical spring strip in the guide groove 524; a connecting plate 526 is provided below the adjusting shaft 523; the connecting plate 526 is fixedly connected to the bottom of the corresponding sets of pressing 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.

[0043] By controlling the rotation of the adjusting shaft 523, such as Figure 6 As shown, taking the adjusting shaft 523 on the right as an example, when the adjusting shaft 523 rotates clockwise, it retracts the pressing strip 525. At this time, the outlet inclination angle formed by the upper end of the pressing strip 525 and the guide groove 524 increases. This inclination angle is the angle between the upper part of the pressing strip 525 and the vertical plane. The pressing strip 525 drives the connecting plate 526 to rise. The tension spring 528 applies a downward pushing force to the connecting plate 526 through the sliding column 527, keeping the lower half of the pressing strip 525 vertical. The upper half of the pressure strip 525 is tightly attached to the guide groove 524 to stably hold the vertical spring strip. At this time, the opening of the adjusting plate group 53 increases and the width of the upper half increases, changing the segmented gradient strength. Similarly, when the adjusting shaft 523 rotates counterclockwise, the outlet inclination angle formed by the upper end of the pressure strip 525 and the guide groove 524 decreases, the opening of the adjusting plate group 53 decreases, and the width of the upper half decreases, so that the segmented strength of the stretcher 5 can also be adjusted according to the requirements, making it more widely applicable.

[0044] Example 3, based on the above examples, further includes: two sets of inner supports 510 are provided on the inner wall of the lifting frame 521; a drive wheel 511 and a transmission wheel 512 are rotatably mounted inside the inner supports 510; a toothed groove 529 is provided on the outer surface of the adjusting shaft 523; the transmission wheel 512 meshes with the toothed groove 529; a shaft hole is provided inside the drive wheel 511; an adjusting rod 513 is slidably connected inside the shaft hole; a screw is provided at one end of the adjusting rod 513 near the inner rotating frame 522; and the screw is threadedly connected to the inner rotating frame 522.

[0045] Furthermore, the radii of both the drive wheel 511 and the transmission wheel 512 are smaller than the inner diameter of the tooth groove 529.

[0046] By rotating the adjusting rod 513, the adjusting rod 513 drives the drive wheel 511 to rotate, the drive wheel 511 drives the transmission wheel 512 to rotate, and the transmission wheel 512 drives the adjusting shaft 523 to rotate through the toothed 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. The adjusting rod 513 slides relative to the drive wheel 511. Therefore, when the adjusting rod 513 is not rotated, the adjusting shaft 523 will not rotate due to the self-locking action of the thread, and the guidance is stable.

[0047] Example 4, based on the above examples, further includes: a lifting motor fixedly mounted on the outer side of the outer casing 51; a lifting screw 54 fixedly mounted on the drive end of the lifting motor; a lifting nut provided on the outer side of the lifting frame 521; the lifting nut being threadedly connected to the lifting screw 54; and the lifting screw 54 being rotatably connected to the outer casing 51 via a bearing seat, which is fixed to the outer casing 51. Preferably, the lifting motor is located at the top of the lifting screw 54, and the bearing seat is installed at the bottom of the lifting screw 54; the bottom end of the lifting screw 54 is at the same height as the bottom of the adjustment port.

[0048] Furthermore, a lifting guide column 55 is fixedly installed on the side of the outer casing 51 away from the lifting screw 54, and a guide sleeve is provided on the side of the lifting frame 521 away from the lifting screw 54, with the lifting guide column 55 sliding through the guide sleeve.

[0049] By controlling the operation of the lifting motor, the lifting motor drives the lifting screw 54 to rotate. The lifting screw 54 drives the lifting frame 521 to rise and fall through the lifting nut. Under the action of the lifting guide column 55 and the guide sleeve, the lifting frame 521 rises and falls stably.

[0050] Example 5, based on the above examples, further includes a sealing edge bag 533 at the contact end between the sealing cloth 531 and the inner wall of the outer shell 51, and a branch pipe 536 on the outer side of the air inlet pipe 535, the branch pipe 536 being connected to the sealing edge bag 533 via a second solenoid valve.

[0051] During adjustment, the sealing bladder 533 is deflated. After adjustment, the sealing bladder 533 is inflated to improve the sealing between the adjustment plate assembly 53 and the outer shell 51. The sealing air pressure is the same as the stretching air pressure to reduce the possibility of air leakage.

[0052] Example 6, based on the above examples, further includes an inner sliding groove 56 on the inner wall of the outer shell 51, with multiple sets of baffles 57 slidably connected inside the inner sliding groove 56. The baffles 57 are horizontally distributed, and friction damping is provided between the baffles 57 and the inner sliding groove 56. The baffles 57 press against the outside of the vertical elastic bar.

[0053] During adjustment, the gaps between the lower half of the adjustment plate group 53 are smaller and the pressure is greater. Therefore, the horizontal distribution of the baffle 57 blocks the outside of the vertical spring bar, which can prevent the lower half of the adjustment plate group 53 from deforming. The baffle 57 can slide up and down in the inner slide groove 56. Before the adjustment component 52 moves down, the baffle 57 is pushed down so that the adjustment component 52 has a sufficient downward adjustment range.

[0054] Example 7: Based on the spunbond nonwoven fabric production equipment provided in the above examples, the experimental production process of spunbond nonwoven fabric includes the following steps:

[0055] S1. Add the raw material to extruder 1, and heat and melt the raw material in extruder 1;

[0056] S2. The melted raw material is extruded into fiber filaments through the spinning box 2;

[0057] S3. The fiber obtained in step S2 is cooled by the side-blowing air window 3 and then enters the stretcher 5. The high-pressure blower 4 blows high-pressure air into the guide box 534 through the air inlet pipe 535, and then blows it between the two sets of adjusting plate groups 53 through the guide box 534. The fiber passes vertically through the slit between the two sets of adjusting plate groups 53, completing the high-pressure slit stretching. At the same time, the bending position of multiple sets of vertical elastic bars in the outer elastic frame 532 can be changed by adjusting the component 52, so that the stretcher 5 has different segments and achieves different stretching forces. Each segment will apply different air pressure to the fiber to gradually complete the stretching process of the fiber, realizing the segmented stretching of the fiber until the fiber is stretched into a fine filament through the stretcher 5.

[0058] S4. The filaments obtained in step S3 enter the filament oscillator 6, which oscillates the filaments into a fiber web; then, the fiber web enters the web forming machine 7.

[0059] S5. Negative pressure fan 10 provides negative pressure air to web forming machine 7. Web forming machine 7 uses negative pressure air to attach fiber web to the screen and convey it to hot roller 8. Hot roller 8 solidifies fiber web into spunbond nonwoven fabric by applying pressure and heating.

[0060] S6. Finally, the spunbond nonwoven fabric is wound up by the winding machine 9.

[0061] This invention employs a slit-type drawing system to achieve precise fiber control, effectively solving problems such as uneven fiber fineness, high drawing energy consumption, and large differences in longitudinal and transverse strength in existing anti-sticking processes, and significantly improving product uniformity and mechanical properties.

[0062] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spunbond nonwoven fabric production equipment based on a large-scale experimental machine, comprising a frame, an extruder (1), a spinning box (2), a side-blowing window (3), a drafter (5), a yarn swivel (6), a web forming machine (7), hot rolling rolls (8), and a winding machine (9), characterized in that, The extruder (1) and spinning box (2) are installed on the top of the frame, and the spinning box (2) is located at the outlet of the extruder (1); the side blowing window (3), the stretcher (5), the yarn swivel (6) and the web forming machine (7) are installed in the interior of the frame from top to bottom, and the side blowing window (3) is located directly below the spinning box (2); the winding machine (9) is located on the left side of the web forming machine (7); the hot rolling roller (8) is located at the left end outlet of the web forming machine (7); a negative pressure fan (10) is located on the right side of the web forming machine (7); and a high pressure fan (4) is located on the front of the negative pressure fan (10). The stretcher (5) includes a housing (51), an adjustment assembly (52), and two sets of adjustment plate assemblies (53). The two sets of adjustment plate assemblies (53) are symmetrically arranged about the center of the housing (51). The adjustment plate assembly (53) consists of an inner sealing cloth (531) and an outer spring frame (532). Adjustment openings are provided through both sides of the housing (51). The part of the outer spring frame (532) located below the adjustment opening is fixedly connected to the inner wall of the housing (51). The remaining part of the outer spring frame (532) is slidably sealed with the housing (51). Multiple sets of vertical spring bars are provided inside the outer spring frame (532). The adjustment assembly (52) is used to change the bending position of the vertical spring bars. The adjustment component (52) includes a lifting frame (521) sleeved on the outside of the outer shell (51). The lifting frame (521) can move up and down along the outer shell (51). The interior of the lifting frame (521) is provided with two sets of rotatable adjustment shafts (523). Multiple sets of guide grooves are opened on the outer surface of the adjustment shafts (523). The guide grooves are correspondingly arranged with the vertical spring strips and the vertical spring strips are engaged in the guide grooves. The vertical spring strips can slide along the guide grooves. The upper half of the outer spring 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 blower (4) are connected to the solenoid valve through the air inlet pipe (535). Two sets of inner rotating brackets (522) are provided on both sides of the inner wall of the lifting frame (521). Two sets of mounting grooves are provided on the outer surface of the adjusting shaft (523). The two sets of inner rotating brackets (522) on the same side are fitted into the corresponding mounting grooves. Both 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 sets of pressing strips (525). The top ends of the two sets of pressing strips (525) are welded to the guide groove (524). On both sides of 24), the edge strip (525) holds the vertical elastic bar in the guide groove (524). A connecting plate (526) is provided below the adjusting shaft (523). The connecting plate (526) is fixedly connected to the bottom of the corresponding multiple sets of edge 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 it and the inner wall of the lifting frame (521).

2. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 1, characterized in that, The inner wall of the lifting frame (521) is provided with two sets of inner supports (510). The inner supports (510) are rotatably mounted with a drive wheel (511) and a transmission wheel (512) that mesh with each other. The outer surface of the adjusting shaft (523) is provided with a toothed groove (529). The transmission wheel (512) meshes with the toothed groove (529). The drive wheel (511) is provided with a shaft hole. An adjusting rod (513) is inserted into the shaft hole. The inner wall of the shaft hole is provided with a groove. A transmission protrusion is provided on the outer side of the adjusting rod (513). The transmission protrusion is slidably connected in the groove. A screw is provided at one end of the adjusting rod (513) near the inner rotating frame (522). The screw is threadedly connected in the inner rotating frame (522).

3. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 2, characterized in that, The diameters of both the drive wheel (511) and the transmission wheel (512) are smaller than the inner diameter of the tooth groove (529).

4. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 3, characterized in that, The outer side of the outer casing (51) is rotatably connected to a lifting screw (54) driven by a lifting motor. The lifting motor is fixedly installed on the outer casing (51). The outer side of the lifting frame (521) is provided with a lifting nut, which is threadedly connected to the lifting screw (54).

5. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 4, characterized in that, A lifting guide column (55) is fixedly installed on the side of the outer shell (51) away from the lifting screw (54), and a guide sleeve is provided on the side of the lifting frame (521) away from the lifting screw (54). The lifting guide column (55) slides through the guide sleeve.

6. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 5, characterized in that, The sealing cloth (531) is provided with a sealing edge bag (533) at the contact end with the inner wall of the outer shell (51), and a branch pipe (536) is provided on the outside of the air inlet pipe (535). The branch pipe (536) is connected to the sealing edge bag (533) through a solenoid valve.

7. The spunbond nonwoven fabric production equipment based on a large-scale experimental machine according to claim 6, characterized in that, The inner wall of the outer shell (51) is provided with an inner sliding groove (56). Multiple sets of baffles (57) are slidably connected inside the inner sliding groove (56). The baffles (57) are horizontally distributed. Friction damping is provided between the baffles (57) and the inner sliding groove (56). The baffles (57) press against the outside of the vertical elastic bar.

8. A spunbond nonwoven fabric production process based on a large-scale testing machine, employing the spunbond nonwoven fabric production equipment based on a large-scale testing machine as described in claim 7, characterized in that, Includes the following steps: S1. Add the raw material to the extruder (1), and heat and melt the raw material in the extruder (1); S2. The melted raw material is extruded into fiber filaments through the spinning box (2); S3. The fiber obtained in step S2 is cooled by the side blowing window (3) and then enters the stretcher (5). The high-pressure blower (4) blows high-pressure air into the guide box (534) through the air inlet pipe (535) and then blows it between the two sets of adjustment plates (53) through the guide box (534). The fiber passes vertically through the slit between the two sets of adjustment plates (53) to complete the high-pressure slit stretching. At the same time, the bending position of the multiple sets of vertical elastic bars in the outer elastic frame (532) can be changed by the adjustment component (52) so that the stretcher (5) has different segments and achieves different stretching forces. Each segment will apply different air pressure to the fiber so as to gradually complete the stretching process of the fiber and realize the segmented stretching of the fiber until the fiber is stretched into a filament through the stretcher (5). S4. The filaments obtained in step S3 enter the filament oscillator (6), which oscillates the filaments into a fiber web; then, the fiber web enters the web forming machine (7); S5. The negative pressure fan (10) provides negative pressure air to the web forming machine (7). The web forming machine (7) uses the negative pressure air to attach the fiber web to the screen and transport it to the hot roller (8). The hot roller (8) solidifies the fiber web into spunbond nonwoven fabric by applying pressure and heating. S6. Finally, the spunbond nonwoven fabric is wound up by the winding machine (9).

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