Breathability detection device for dried textile fabric

Abstract

The invention discloses a device for detecting air permeability of a dried textile fabric, and relates to the technical field of air permeability detection.The device comprises a case, a sealing bin is installed in an inner cavity of the case, a connecting plate connected with the sealing bin is fixedly connected to the upper surface of the case, and a fabric, an upper cover plate and a hollow panel are sequentially arranged over the connecting plate from bottom to top; an upper-layer steel wire mesh is fixedly connected to the bottom of the hollowed-out panel, a lower-layer steel wire mesh is fixedly connected to the inner wall of the connecting plate, and when the hollowed-out panel is pressed downwards, the upper-layer steel wire mesh is driven to move downwards synchronously, so that the fabric located between the upper-layer steel wire mesh and the lower-layer steel wire mesh is pressed and forms a corrugated and wrinkled structure; a round rolling disc is arranged on the upper surface of the upper-layer steel wire mesh, uniform pressure is applied to the upper-layer steel wire mesh through the round rolling disc, it is ensured that the fabric forms a random and irregular corrugated wrinkle form between the upper-layer steel wire mesh and the lower-layer steel wire mesh, the actual practical form is simulated, and the authenticity of the detection result is improved.

Description

Technical Field

[0001] This invention relates to the field of air permeability testing technology, specifically to a device for testing the air permeability of textile fabrics after drying. Background Technology

[0002] After the textile fabric is dried, its air permeability needs to be tested quickly and accurately to ensure that its air permeability still meets the design requirements and usage standards after high-temperature drying. The air permeability of textiles is a core physical indicator for measuring their comfort, protective reliability, and filtration efficiency. It is widely used in clothing, protective equipment, filter materials, home textiles, and industrial textiles. The air permeability directly determines the fabric's air transmission capacity, moisture removal efficiency, and external medium barrier effect. Therefore, accurate and practical testing of the air permeability of textiles is a key link in material research and development, quality control, and product finalization. Traditional breathability testing devices typically lay the fabric sample flat and clamp it, then calculate the breathability by measuring the airflow under a certain pressure difference. However, during actual wear or use, fabrics often experience varying degrees of wrinkling, stretching, or compression due to stress. These morphological changes significantly affect their breathability. For example, clothing fabrics form multiple wrinkles during human activity, and protective masks undergo localized deformation due to facial contours when worn. These morphological changes under actual working conditions lead to changes in the gaps between fibers within the fabric, thereby affecting breathability. Traditional devices use planar detection methods, which cannot simulate the complex deformation state of fabrics in actual applications, resulting in significant deviations between the test results and real-world usage scenarios, making it difficult to accurately reflect the breathability performance of fabrics after deformation under stress.

[0003] To address the aforementioned issues, there is an urgent need for innovative designs based on existing air permeability testing devices. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the present invention aims to provide a textile fabric air permeability testing device after drying, in order to solve the problem mentioned in the background that traditional air permeability testing devices cannot simulate the complex deformation state of fabrics in actual applications, resulting in a large deviation between the test results and the actual use scenario.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a textile fabric air permeability testing device after drying, comprising a housing, a sealed chamber installed in the inner cavity of the housing, a connecting plate fixedly connected to the upper surface of the housing, a fabric, a top cover plate, and a perforated panel arranged sequentially from bottom to top above the connecting plate, an upper layer of wire mesh fixedly connected to the bottom of the perforated panel, and a lower layer of wire mesh fixedly connected to the inner wall of the connecting plate. When the perforated panel is pressed down, it drives the upper layer of wire mesh to move down synchronously, causing the fabric located between the upper and lower layers of wire mesh to be compressed and form a corrugated and wrinkled structure. A circular rolling disc is provided on the upper surface of the upper layer of wire mesh. By sliding the circular rolling disc, the fabric that has formed a corrugated and wrinkled shape is locally rolled, causing some areas to transform into irregular wrinkles.

[0006] Preferably, the sealed chamber extends through to the upper surface of the chassis and communicates with the connecting plate. A support frame is fixedly connected to the upper surface of the chassis. Feeding rollers and receiving rollers are rotatably connected to both sides of the support frame. A set of elastic adjustment components is provided on both sides of the connecting plate near the feeding rollers and receiving rollers.

[0007] Preferably, the elastic adjustment assembly includes two guide rollers, one of which is rotatably connected to two moving blocks at both ends via bearings, the two moving blocks are slidably connected to the support frame via two linear slide rails, and the bottom of the moving blocks is fixedly connected to the bottom of the inner wall of the linear slide rail via two spring telescopic rods.

[0008] Preferably, a lower sealing ring is fixedly connected to the four edges of the upper surface of the connecting plate, and an upper sealing ring is fixedly connected to the lower surface of the upper cover plate at the position corresponding to the lower sealing ring. Two limiting frames are installed on the left and right sides of the upper surface of the upper cover plate, and two first hydraulic rods are installed on the front and rear sides of the upper surface of the upper cover plate. The left and right sides of the hollow panel are slidably connected to two limiting frames, respectively.

[0009] Preferably, the perforated panel includes two symmetrically distributed side plates, which are fixedly connected by a partition. The partition is provided with a number of holes and slots and a guide rail. The inner wall of the guide rail is slidably connected with a moving rod, and the inner wall of the guide rail is provided with a number of silicone strips. Two second hydraulic rods are installed on the left and right sides of the partition.

[0010] Preferably, both the upper and lower wire mesh are designed as continuously bent S-shapes, and the upper and lower wire meshes are aligned vertically. The upper wire mesh is fixedly connected to the bottom of the two side plates.

[0011] Preferably, the movable rod extends through the lower surface of the partition and is fixedly connected to the circular rolling disc. A connecting block is rotatably connected to the top of the movable rod, and a guide rod extends through the interior of the connecting block.

[0012] Preferably, the bottom of the circular rolling disc has an irregular protrusion, and each of the two side plates has a straight groove, with both ends of the straight groove bent upwards.

[0013] Preferably, a linear module is installed on the hollow panel, a crossbar is fixedly connected to the sliding block of the linear module, two adjusting blocks are slidably connected to both ends of the crossbar, and both ends of the guide rod pass through the outside of the two linear sliding grooves and are fixedly connected to the two adjusting blocks.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention features an elastic adjustment assembly consisting of a spring telescopic rod, a moving block, and a guide roller on both sides of the feeding path. This assembly can sense and respond to tension fluctuations during fabric conveying in real time. When the tension is too high, the fabric is automatically released; when the tension is too low, the fabric is actively tightened, ensuring that the fabric enters the detection area in a constant and moderate pre-tension state. This mechanism effectively avoids planar deformation caused by slackness or overstretching, providing a reliable prerequisite for the subsequent collection of air permeability benchmark data.

[0015] This invention uses upper and lower steel wire mesh to interlock and fix the fabric, causing the fabric to be uniformly compressed into continuous, periodic corrugated pleats along the bending trajectory of the steel wire mesh. The wave height can be precisely adjusted by the stroke of the second hydraulic rod, achieving standardized reproduction of regular deformation states under different usage scenarios. This regular corrugation detection mode is suitable for evaluating the breathability of simulated fabrics under static regular deformation scenarios such as stacking and wrapping, such as double-layered folded areas of clothing collars and cuffs. Through standardized corrugation parameter settings, the quantitative impact of pleat density and depth on breathability can be systematically analyzed.

[0016] In addition, based on the regular corrugated pattern, a circular rolling disc with irregular protrusions at the bottom is introduced. Driven by a linear module, the disc moves horizontally and rotates slightly during sliding via silicone strips on the inner wall of the guide rail. This causes the protrusions to act on the fabric surface at random angles and with pressure, squeezing the upper wire mesh and fabric. As a result, more complex and irregular three-dimensional pleats are generated on the basis of the existing regular corrugated folds. This allows for a comprehensive evaluation of the differences in air permeability of textile fabrics under different deformation states, providing a more scientific and accurate basis for fabric design, production, and application, and achieving a leap from static planar to dynamic and realistic testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the connecting plate, the top cover plate, and the unfolded fabric structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the unfolded structure of the connecting plate and the lower wire mesh of the present invention.

[0020] Figure 4 This is a schematic diagram of the installation position structure of the elastic adjustment component of the present invention.

[0021] Figure 5 This is a schematic diagram of the unfolded structure of the upper cover plate and the hollow panel of the present invention.

[0022] Figure 6 This is a schematic diagram of the unfolded structure of the hollow panel and the upper wire mesh of the present invention.

[0023] Figure 7 This is a cross-sectional view of the perforated panel portion of the present invention.

[0024] Figure 8 This is a diagram showing the state of the upper and lower wire mesh layers after they are combined according to the present invention.

[0025] Figure 9 This is a bottom view of the circular rolling disc structure of the present invention.

[0026] Figure 10 This is a diagram showing the working state of the circular rolling disc of the present invention.

[0027] In the diagram: 1. Chassis; 101. Support frame; 102. Feeding roller; 103. Receiving roller; 104. Guide roller; 105. Moving block; 106. Linear slide rail; 107. Spring telescopic rod; 2. Sealed chamber; 3. Connecting plate; 4. Top cover plate; 401. Limiting frame; 402. First hydraulic rod; 5. Hollow panel; 501. Side plate; 502. Partition; 503. Guide slide rail; 504. Moving rod; 505. Connecting block; 506. Guide rod; 507. Linear slide groove; 6. Upper wire mesh; 7. Lower wire mesh; 8. Circular rolling disc; 9. Second hydraulic rod; 10. Linear module; 11. Crossbar; 12. Adjusting block. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1 to 10This invention provides a technical solution: a textile fabric air permeability testing device after drying, including a housing 1, a sealed chamber 2 installed in the inner cavity of the housing 1, a connecting plate 3 fixedly connected to the upper surface of the housing 1 to connect the sealed chamber 2, and a fabric, an upper cover plate 4 and a hollow panel 5 arranged sequentially from bottom to top on the top of the connecting plate 3, an upper wire mesh 6 fixedly connected to the bottom of the hollow panel 5, and a lower wire mesh 7 fixedly connected to the inner wall of the connecting plate 3. When the hollow panel 5 is pressed down, it drives the upper wire mesh 6 to move down synchronously, so that the fabric located between the upper wire mesh 6 and the lower wire mesh 7 is compressed and forms a corrugated and wrinkled structure. A circular rolling disc 8 is provided on the upper surface of the upper wire mesh 6. By sliding the circular rolling disc 8, the fabric that has formed a corrugated and wrinkled shape is locally rolled, so that some areas of it are transformed into irregular wrinkles. The upper wire mesh 6 and the lower wire mesh 7 can form regular and uniform wavy folds in the fabric, realizing the standardized simulation of the fabric compression deformation. Unlike traditional planar testing, a circular rolling disc 8 with irregular protrusions is set up to locally roll the fabric on the basis of wavy folds, forming real and irregular complex folds, which highly restores the deformation state of the fabric in actual wear and use, making the test results closer to the actual application scenario.

[0030] In this embodiment, as Figures 1 to 4 As shown, the sealed chamber 2 extends through to the upper surface of the casing 1 and is interconnected with the connecting plate 3. A support frame 101 is fixedly connected to the upper surface of the casing 1. Feeding roller 102 and receiving roller 103 are rotatably connected to both sides of the support frame 101. A set of elastic adjustment components is provided on both sides of the connecting plate 3 near the feeding roller 102 and receiving roller 103. The elastic adjustment assembly includes two guide rollers 104. The two ends of one guide roller 104 are rotatably connected to two moving blocks 105 via bearings. The two moving blocks 105 are slidably connected to the support frame 101 via two linear slide rails 106. The bottom of the moving blocks 105 is fixedly connected to the bottom of the inner wall of the linear slide rail 106 via two spring telescopic rods 107. It should be noted that during the testing process, the feeding roller 102 is responsible for continuously conveying the textile fabric to be tested to the area of ​​the connecting plate 3, while the take-up roller 103 rewinds the sample after the test is completed, thus realizing an automated continuous testing process. Meanwhile, elastic components are installed on both sides of the connecting plate 3. The elastic adjustment components play a key role in the fabric conveying process. When the fabric is conveyed from the feeding roller 102 to the connecting plate 3, it will first pass between the two guide rollers 104 of one set of elastic adjustment components. One guide roller 104 is in a high position and the other is in a low position. The guide rollers 104 in the low position on both sides are used to control the fabric to be on the same horizontal plane, so as to flatly press the fabric and guide it to the detection area. The guide roller 104 at the high position is slidably connected to the linear slide rail 106 at both ends by moving blocks 105. When tension fluctuations occur during the fabric conveying process, the spring telescopic rod 107 will adaptively extend and retract according to the tension of the fabric. If the fabric tension is too high, the spring telescopic rod 107 will be compressed and contracted, causing the moving blocks 105 to slide downward along the linear slide rail 106, and the high-position guide roller 104 will descend accordingly, thereby reducing the tension on the fabric. If the fabric tension is too low, the spring telescopic rod 107 will reset and extend, pushing the moving blocks 105 to move upward, and the high-position guide roller 104 will rise to tension the fabric. This dynamic adjustment mechanism ensures that the fabric maintains a relatively stable tension state during planar inspection, while providing sufficient pre-tension allowance for subsequent wavy and wrinkle inspection.

[0031] In this embodiment, as Figure 3 , Figure 5 and Figure 8 As shown, a lower sealing ring is fixedly connected to the four edges of the upper surface of the connecting plate 3, and an upper sealing ring is fixedly connected to the lower surface of the upper cover plate 4 at the position corresponding to the lower sealing ring. Two limiting frames 401 are installed on the left and right sides of the upper surface of the upper cover plate 4, and two first hydraulic rods 402 are installed on the front and rear sides of the upper surface of the upper cover plate 4. The hollow panel 5 is slidably connected to two limiting frames 401 on its left and right sides, respectively. The perforated panel 5 includes two symmetrically distributed side plates 501, and the two side plates 501 are fixedly connected by a partition 502. The partition 502 is provided with several holes and slots and a guide rail 503. The inner wall of the guide rail 503 is slidably connected with a moving rod 504, and the inner wall of the guide rail 503 is provided with several silicone strips. Two second hydraulic rods 9 are installed on the left and right sides of the partition 502. Both the upper wire mesh 6 and the lower wire mesh 7 are designed as continuously bent S-shapes, and the upper wire mesh 6 and the lower wire mesh 7 are aligned in the vertical direction. The upper wire mesh 6 is fixedly connected to the bottom of the two side plates 501.

[0032] It should be noted that before the test begins, the first hydraulic rod 402 is activated and drives the upper cover plate 4 to move downward until the upper sealing ring and the lower sealing ring are tightly fitted. At this time, the fabric just seals the opening at the top of the connecting plate 3, forming a closed test space, which effectively avoids external airflow from interfering with the test results. In this embodiment, the test process steps are mainly divided into three stages: plane test, corrugated wrinkle test, and irregular wrinkle test. During the planar testing phase, the two second hydraulic rods 9 control the partition 502 to be in a high position. The cylinder part of the two second hydraulic rods 9 is installed on one side of the limiting frame 401, and the telescopic rod part is connected to the partition 502. The entire hollow panel 5 is controlled to slide up along the limiting frame 401 through the second hydraulic rods 9 and is in an initial high position. The upper wire mesh 6 does not contact the upper surface of the fabric. It should be noted that the lower wire mesh 7 is slightly lower than the horizontal plane of the upper surface of the connecting plate 3. The fabric is laid flat on top of the lower wire mesh 7, maintaining a natural and flat state. At this time, the airflow in the sealed chamber 2 can pass through the flat fabric evenly and be discharged to the outside through the holes and slots of the upper partition 502, completing the collection of the air permeability benchmark data in the planar state. It should be noted that, in this embodiment, a display is installed on the top of the chassis 1, and a controller is installed inside the display. An airflow sensor and a pressure sensor connected to the sealed chamber 2 are also installed inside the chassis 1. An air inlet pipe and an air pump are installed inside the chassis 1 to supply air to the sealed chamber 2. The airflow sensor is used to monitor the airflow through the fabric in real time, and the pressure sensor is used to detect the pressure difference inside and outside the sealed chamber 2. These data are transmitted to the controller in real time. The controller automatically calculates the air permeability of the fabric and displays it intuitively on the display. This detection process belongs to the prior art. After the planar inspection is completed, the corrugation and wrinkle inspection stage begins. When entering the corrugation and wrinkle inspection stage, the entire upper cover plate 4 needs to be moved upward to separate from the connecting plate 3. The second hydraulic rod 9 is activated to drive the partition plate 502 to slide downward along the limiting frame 401 until the entire hollow panel 5 and the upper wire mesh 6 move downward together and pass through the upper cover plate 4. At this time, the horizontal height of the upper wire mesh 6 is slightly lower than the lower surface of the upper cover plate 4. The first hydraulic rod 402 is restarted to move the upper cover plate 4 and the hollow panel 5 downward together again. When the S-shaped peaks of the lower wire mesh 7 and the S-shaped troughs of the upper wire mesh 6 are aligned vertically and contact the fabric, the fabric will form a continuous corrugated pleated structure along the bending trajectory of the upper wire mesh 6 and the lower wire mesh 7 under the squeezing action of the upper wire mesh 6 and the lower wire mesh 7. The wavelength and wave height of this corrugated pleat can be precisely controlled by adjusting the extension and retraction of the second hydraulic rod 9 to simulate different degrees of compression deformation. For example, by setting different downward strokes, the fabric can form regular corrugations with different wave heights such as 5mm, 10mm or 15mm to meet the simulation requirements of fabric deformation state under different application scenarios. Additionally, as the upper wire mesh 6 moves downward, the compressed fabric moves downward simultaneously. The elastic adjustment components on both sides adaptively adjust the height of the guide rollers 104 to match the length change of the fabric when it is compressed and forms wavy folds. When the fabric needs more material due to folds, the moving block 105 moves downward, causing the high-position guide rollers 104 to drop, thereby releasing some fabric reserves and preventing the fabric from being overstretched. After the wavy fold state stabilizes, as the upper cover plate 4 covers the connecting plate 3 again, the sealing chamber 2 restarts air supply. The airflow sensor and pressure sensor re-collect data, and the controller calculates and records the air permeability under this state, comparing it with the planar detection data to analyze the change law of the fabric's air permeability performance under regular deformation. In this embodiment, the upper wire mesh 6 and the lower wire mesh 6... The upper and lower layers of wire mesh 7 are interlocked, clamping and fixing the middle fabric to ensure that the fabric does not shift or loosen when airflow passes through, thus guaranteeing the stability of the test data. During the corrugation and wrinkle detection stage, the holes and slots on the partition 502 remain open so that airflow can smoothly penetrate the wrinkled fabric. This regular corrugation and wrinkle detection mode is suitable for evaluating the breathability of fabrics under static regular deformation scenarios such as stacking and wrapping, such as double-folded areas of clothing collars and cuffs, or decorative parts that fix wrinkles in home textiles. The bending density and curvature of the upper wire mesh 6 and the lower wire mesh 7 can be customized according to actual needs. Through standardized corrugation parameter settings, the quantitative impact of wrinkle density and depth on breathability can be systematically analyzed.

[0033] In this embodiment, as Figures 7 to 10 As shown, the moving rod 504 extends through the lower surface of the partition 502 and is fixedly connected to the circular rolling disc 8. The top of the moving rod 504 is rotatably connected to the connecting block 505, and the guide rod 506 extends through the interior of the connecting block 505. The bottom of the circular rolling disc 8 has an irregular protrusion, and a straight groove 507 is opened on each of the two side plates 501. Both ends of the straight groove 507 are bent upward. A straight module 10 is installed on the hollow panel 5. A crossbar 11 is fixedly connected to the sliding block of the straight module 10. Two adjusting blocks 12 are slidably connected to both ends of the crossbar 11. The two ends of the guide rod 506 pass through the outside of the two straight slide grooves 507 respectively and are fixedly connected to the two adjusting blocks 12. It should be noted that during the irregular wrinkle detection stage, the straight module 10 starts working. When the straight module 10 is activated, its sliding block drives the crossbar 11 to move horizontally. Since the two ends of the guide rod 506 are fixedly connected to the adjusting block 12, and the adjusting block 12 is slidably connected to the crossbar 11, and the guide rod 506 passes through the straight groove 507 on the side plate 501, the movement of the crossbar 11 will drive the guide rod 506 to slide along the straight groove 507. The guide rod 506 will drive the connecting block 505 and the moving rod 504 rotatably connected to it to move synchronously, so that the moving rod 504 slides along the guide rail 503 on the partition 502. It should be noted that the two ends of the straight chute 507 are designed to bend upwards. When the guide rod 506 is located at the two ends of the straight chute 507 and bends upwards, the guide rod 506 will drive the moving rod 504 to move horizontally upwards, thereby driving the circular roller 8 to a high position. During the corrugation detection stage, the circular roller 8 is not in contact with the lower wire mesh 7 and will not interfere with the corrugation pattern. Once the guide rod 506 slides into the straight section along the straight chute 507, the circular roller 8 moves downwards synchronously, and the irregular protrusion at its bottom begins to contact the fabric surface that has formed corrugations below. In this embodiment, the circular roller 8 and the irregular protrusion at the bottom are provided with several through-hole ventilation holes. In this embodiment, there is always a gap between the circular roller 8 and the partition 502. These ventilation holes can ensure that the airflow is discharged through the circular roller 8, avoiding the impact of complete blockage on the accuracy of the ventilation detection. In this embodiment, both the upper wire mesh 6 and the lower wire mesh 7 are made of stainless steel with a relatively fine wire diameter. After being squeezed, they can elastically recover from deformation within a small deformation range. The specific mesh size can be designed according to the type of fabric to ensure effective clamping of the fabric and maintain good breathability. Furthermore, as the linear module 10 drives the crossbar 11 to move intermittently, the guide rod 506 slides intermittently along the straight section of the linear slide groove 507. Several silicone strips provided on the inner wall of the guide rail 503 can increase the damping feel when the moving rod 504 slides. The surface of the moving rod 504 is also provided with a silicone layer. Therefore, during the sliding process of the moving rod 504, a certain friction force will be generated between the silicone strips and the silicone layer, causing the circular rolling disc 8 and the moving rod 504 to rotate slightly. In this embodiment, when the irregular protrusions at the bottom of the circular rolling disc 8 remain at different positions, they will form different rolling pressure and contact patterns on the fabric. When the high protrusions come into contact with the fabric, they will form local strong compression, while when the flat areas of the low protrusions come into contact, they will form surface weak compression. This random pressure distribution further enhances the irregularity of the folds. In addition, the position of the circular rolling disc 8 is controlled by the linear module 10 to move and stop at a certain point. When the moving rod 504 slides on the guide rail 503, it rotates due to resistance and causes the circular rolling disc 8 to deflect at a certain angle, so that the angle of the irregular protrusions is also adjusted. It is no longer limited to a single protrusion shape, but forms a random compression state in different positions. This pressure is transmitted to the upper wire mesh 6 and the lower wire mesh 7, and simultaneously causes the middle interlayer fabric to deform. Thus, on the basis of the existing regular wavy folds, a more complex and irregular three-dimensional fold deformation is generated, simulating the real deformation of the fabric caused by limb movement and repeated friction during actual wear. Meanwhile, airflow and pressure sensors collect breathability data in real time, and the controller calculates and records the breathability under irregular folds. The data is then compared and analyzed in a comprehensive manner with the data under flat and regular wavy folds to comprehensively evaluate the differences in breathability performance of textile fabrics under different deformation states, providing a more scientific and accurate basis for the design, production and application of fabrics.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the air permeability of textile fabric after drying, comprising a housing (1), wherein a sealing chamber (2) is installed in the inner cavity of the housing (1), and a connecting plate (3) for connecting the sealing chamber (2) is fixedly connected to the upper surface of the housing (1), characterized in that: The connecting plate (3) is provided with fabric, upper cover plate (4) and hollow panel (5) from bottom to top. The bottom of the hollow panel (5) is fixedly connected to the upper wire mesh (6), and the inner wall of the connecting plate (3) is fixedly connected to the lower wire mesh (7). When the hollow panel (5) is pressed down, the upper wire mesh (6) moves down synchronously, so that the fabric between the upper wire mesh (6) and the lower wire mesh (7) is pressed and forms a corrugated pleated structure. The upper surface of the upper wire mesh (6) is provided with a circular rolling disc (8). By sliding the circular rolling disc (8), the fabric that has formed corrugated pleats is locally rolled, so that some areas of it are transformed into irregular pleats.

2. The air permeability testing device for textile fabrics after drying according to claim 1, characterized in that: The sealed chamber (2) extends through the upper surface of the chassis (1) and communicates with the connecting plate (3). A support frame (101) is fixedly connected to the upper surface of the chassis (1). Feeding roller (102) and receiving roller (103) are rotatably connected to both sides of the support frame (101). A set of elastic adjustment components is provided on both sides of the connecting plate (3) near the feeding roller (102) and receiving roller (103).

3. The air permeability testing device for textile fabrics after drying according to claim 2, characterized in that: The elastic adjustment assembly includes two guide rollers (104), one of which is rotatably connected to two moving blocks (105) at both ends via bearings. The two moving blocks (105) are slidably connected to the support frame (101) via two linear slide rails (106). The bottom of the moving block (105) is fixedly connected to the bottom of the inner wall of the linear slide rail (106) via two spring telescopic rods (107).

4. The air permeability testing device for textile fabrics after drying according to claim 1, characterized in that: The upper surface of the connecting plate (3) is fixedly connected with a lower sealing ring around its perimeter. The lower surface of the upper cover plate (4) is fixedly connected with an upper sealing ring at the position corresponding to the lower sealing ring. Two limiting frames (401) are installed on the left and right sides of the upper surface of the upper cover plate (4). Two first hydraulic rods (402) are installed on the front and rear sides of the upper surface of the upper cover plate (4). The hollow panel (5) is slidably connected to two limiting frames (401) on its left and right sides respectively.

5. The air permeability testing device for textile fabrics after drying according to claim 1, characterized in that: The perforated panel (5) includes two symmetrically distributed side plates (501), and the two side plates (501) are fixedly connected by a partition (502). The partition (502) is provided with several holes and slots and a guide rail (503). The inner wall of the guide rail (503) is slidably connected with a moving rod (504), and the inner wall of the guide rail (503) is provided with several silicone strips. Two second hydraulic rods (9) are installed on the left and right sides of the partition (502).

6. The air permeability testing device for textile fabrics after drying according to claim 5, characterized in that: The upper wire mesh (6) and the lower wire mesh (7) are both set as continuously bent S-shaped, and the upper wire mesh (6) and the lower wire mesh (7) are aligned in the vertical direction. The upper wire mesh (6) is fixedly connected to the bottom of the two side plates (501).

7. The air permeability testing device for textile fabrics after drying according to claim 5, characterized in that: The movable rod (504) extends through the lower surface of the partition (502) and is fixedly connected to the circular rolling disc (8). The top of the movable rod (504) is rotatably connected to a connecting block (505), and a guide rod (506) extends through the interior of the connecting block (505).

8. The air permeability testing device for textile fabrics after drying according to claim 5, characterized in that: The bottom of the circular rolling disc (8) is provided with irregular protrusions, and a straight groove (507) is provided on each of the two side plates (501), with both ends of the straight groove (507) bent upwards.

9. The air permeability testing device for textile fabrics after drying according to claim 7, characterized in that: A straight module (10) is installed on the hollow panel (5). A crossbar (11) is fixedly connected to the sliding block of the straight module (10). Two adjusting blocks (12) are slidably connected to both ends of the crossbar (11). The two ends of the guide rod (506) pass through the outside of the two straight slide grooves (507) respectively and are fixedly connected to the two adjusting blocks (12).

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