Intelligent textile air permeability detection device and method

Abstract

This invention relates to the field of textiles, specifically to an intelligent device and method for testing the air permeability of textiles. The device includes a body with a sample ring, a clamping ring, a lifting system, an air path system, an airflow monitoring system, and a controller. The clamping ring has several evenly spaced control grooves along its circumference at its bottom. Contact blocks are slidably fitted within each control groove, and pressure sensors are embedded in the bottom of each contact block. These pressure sensors are connected to the controller. Control components are located within each control groove, and auxiliary components are mounted on each contact block. This invention uses pressure sensors at the bottom of the contact blocks to detect the position of wrinkles in the sample in real time. An electrically controlled cylinder drives the contact blocks to vibrate up and down, combined with airflow-assisted blowing, to smooth the textile sample before clamping, thereby reducing the interference of wrinkles on the accuracy of air permeability testing.

Description

Technical Field

[0001] This invention relates to the field of textiles, and more specifically to an intelligent device and method for testing the air permeability of textiles. Background Technology

[0002] In the production and application of textiles, breathability is a crucial quality indicator, directly affecting the comfort, user experience, and functionality of textiles. Whether it is apparel textiles, such as underwear and outdoor sportswear, or industrial textiles, such as medical protective clothing and filter materials, breathability determines whether they can meet the needs of specific scenarios. Therefore, accurate testing of the breathability of textiles is a key link in controlling product quality and meeting market demands.

[0003] Currently, there are two main methods for testing the air permeability of textiles: the constant pressure method and the constant flow method. The constant pressure method maintains a constant pressure difference across the sample and measures the airflow rate through the sample per unit time to characterize air permeability. The constant flow method maintains a constant airflow rate through the sample, measures the pressure difference across the sample, and then calculates the air permeability. In practical testing, commonly used equipment includes the Darong Textile Instrument YG(B)461E fabric air permeability tester and the SDL... Atlas's air permeability testers, etc.; the Darong Textile Instrument YG(B)461E fabric air permeability tester mainly consists of a main unit, a sample clamping device, an air path system, a control system, and a data processing system. The sample clamping device is used to fix the textile sample and ensure the stability of the sample position during the test. The air path system is responsible for providing a stable airflow and accurately controlling the pressure difference or flow rate. The control system realizes the automated control of the test process through built-in programs, including parameter setting, data acquisition, and operation status monitoring. The data processing system can collect test data in real time, analyze and calculate, and finally output accurate air permeability performance indicators. This equipment can quickly and accurately detect the air permeability performance of textiles by precisely controlling airflow and pressure, providing reliable data support for the quality assessment of textiles, improving testing efficiency and the accuracy of test results. In actual use of the Darong Textile Instrument YG(B)461E fabric air permeability tester, the textile needs to be placed on the device manually. When the textile is not placed evenly or has wrinkles, the path of airflow will be changed due to the unevenness or wrinkles. The airflow resistance in some areas will increase, while the airflow resistance in other areas will decrease. As a result, the measured airflow or pressure difference cannot truly reflect the actual air permeability of the textile, thus affecting the accuracy of the test results.

[0004] Therefore, this invention proposes an intelligent device and method for testing the air permeability of textiles to solve the above problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an intelligent device and method for testing the air permeability of textiles. The device uses a pressure sensor at the bottom of the contact block to detect the position of wrinkles in the sample in real time. An electrically controlled cylinder drives the contact block to vibrate up and down in conjunction with airflow-assisted blowing to smooth the textile sample before pressing, thereby reducing the interference of wrinkles on the accuracy of air permeability testing.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: An intelligent textile air permeability testing device includes a body, on which a sample ring, a pressing ring, a lifting system, an air path system, an airflow monitoring system, and a controller are provided. The bottom of the pressing ring has several evenly arranged control grooves along its circumference. Contact blocks are slidably fitted in each control groove. Pressure sensors are embedded in the bottom of each contact block. The pressure sensors are all connected to the controller. Each control groove is provided with a control component for controlling the up and down movement of the contact blocks. Each contact block is provided with an auxiliary component for assisting in smoothing wrinkles.

[0007] The technical principles of the above solution are as follows: The textile sample is placed on the sample ring, and then the lifting system controlled by the controller drives the clamping ring to descend. The descent of the clamping ring causes the contact block to descend synchronously. During the descent of the clamping ring, the bottom of the contact block first contacts the wrinkles and arches of the sample. The wrinkles contact the pressure sensor at the bottom of the corresponding contact block. The pressure signal monitored by the pressure sensor controls the operation of the corresponding control component, which drives the contact block to move up and down to shake the sample and smooth it out. During the up and down movement of the contact block, the gas in the control groove is applied to the sample through the auxiliary component to further smooth the wrinkles.

[0008] The above approach has the following beneficial effects: 1. In this solution, after detecting wrinkles by a pressure sensor, the up-and-down movement of the contact block is used to simulate vibration to smooth out the wrinkles and reduce the risk of wrinkles during clamping and fixing. 2. In this solution, the gas inside the control groove is compressed by the up-and-down movement of the contact block, so that the gas acts on the sample through the auxiliary components, further helping to eliminate wrinkles; 3. This scheme improves the smoothness of the sample surface by indirectly monitoring and eliminating wrinkles, thereby improving the uniformity and accuracy of air permeability testing.

[0009] Furthermore, the control components all include electric cylinders, the top of each electric cylinder is fixedly connected to the top wall of the corresponding control slot, the output shaft of each electric cylinder is fixedly connected to the top of the corresponding contact block, and each electric cylinder is connected to the controller signal.

[0010] Beneficial effects: The controller sends a command to the electric cylinder, which drives the contact block to slide up and down. The up and down movement of the contact block simulates vibration acting on the wrinkles of the sample, smoothing the sample.

[0011] Furthermore, each auxiliary component includes several through holes opened along the height direction of the contact block. Each through hole is equipped with a one-way valve on the side near the sample ring, and each control groove sidewall is connected to a one-way pressure relief valve.

[0012] Beneficial effect: When the contact block moves up and down, it repeatedly squeezes the gas in the control groove, allowing the gas to act on the sample through the through hole, further smoothing the wrinkles in the sample.

[0013] Furthermore, limit blocks are fixedly connected to both sides of the contact block, and several limit grooves corresponding to the limit blocks are opened on the inner wall of the control groove. When the top of the limit block contacts the top wall of the corresponding limit groove, the bottom of the corresponding contact block and the bottom of the clamping ring are on the same horizontal plane.

[0014] Beneficial effects: In the initial state, the bottom of the limiting block is in contact with the bottom wall of the limiting groove. As the clamping ring descends, the limiting block slides upward in the limiting groove. The limiting groove limits the maximum shrinkage of the contact block, ensuring that the bottom of the contact block can be on the same plane as the bottom of the clamping ring after the contact block is fully shrunk, which makes it easier for the clamping ring to fix the sample on the sample ring.

[0015] Furthermore, buffer pads are fixedly connected to the side of the contact block near the sample ring.

[0016] Beneficial effects: By utilizing the elasticity and softness of the cushioning material, the impact force between the contact block and the sample surface is reduced.

[0017] Furthermore, a spring is fitted onto the output shaft of the electronically controlled cylinder.

[0018] Beneficial effects: The spring's buffering effect absorbs the impact force generated when the contact block moves up and down driven by the electric cylinder, preventing excessive impact or damage to the textile sample. At the same time, the spring's elastic restoring characteristics help make the smoothing action of the contact block gentler and smoother, thereby improving the safety of the sample during the wrinkle elimination process and helping to maintain appropriate contact pressure between the contact block and the sample, further improving the reliability of air permeability testing.

[0019] Furthermore, the inner wall of the limiting groove and the surface of the limiting block are both coated with polytetrafluoroethylene.

[0020] Beneficial effects: The low coefficient of friction of the polytetrafluoroethylene coating reduces friction during the sliding process of the contact block, improving the smoothness of the contact block's movement.

[0021] Furthermore, several displacement sensors corresponding to the control slots are embedded in the bottom of the clamping ring, and all displacement sensors are connected to the controller signal.

[0022] Beneficial effects: By monitoring the displacement of the clamping ring through a displacement sensor, the distance between the bottom of the clamping ring and the top of the sample truncated cone can be reflected, thereby controlling the maximum displacement of the contact block moving up and down and avoiding collision between the contact block and the sample during the movement of the contact block.

[0023] Furthermore, the machine body is equipped with a touch display, which is connected to the controller via signals.

[0024] Beneficial effects: The touch screen enables human-computer interaction, making it easy for users to set detection parameters, view detection data, and control the detection process.

[0025] Furthermore, an intelligent method for testing the air permeability of textiles includes the following steps: S1: Sample Placement: Unfold the textile sample and place it on the sample ring; S2: Sample smoothing: The lifting system is controlled by the controller to drive the clamping ring to descend. When the contact block comes into contact with the wrinkles and arches of the sample during the descent, the corresponding pressure sensor detects the pressure signal and transmits it to the controller. The controller controls the electric cylinder to drive the corresponding contact block to move up and down in a cyclical manner to smooth the wrinkles. When the contact block moves up and down, it squeezes the air inside the control groove so that it acts on the sample through the through hole, and then the airflow further unfolds and flattens the sample. S3: Sample Fixation: The pressure signal between the contact block and the sample is monitored in real time by a pressure sensor. The pressure value between the contact block and the sample reflects the fixation status of the sample. Then, the lifting system is stopped by the controller to complete the sample fixation. S4: Parameter setting: After the sample is fixed, input the detection parameters to the controller via the touch display, including the preset pressure difference, flow rate and detection time; the controller starts the gas circuit system according to the parameter instructions and adjusts the air pressure or flow rate to the set value; S5: Air permeability test: After the air path system outputs airflow stably, the airflow monitoring system collects the airflow rate or pressure difference data passing through the sample in real time and transmits the data to the controller; the controller analyzes and processes the data to calculate the air permeability performance index of the textile. S6: Data Output: After the test is completed, the controller organizes the air permeability test results data and displays the test report on the touch screen. It also supports data export and printing, thus completing the entire test process.

[0026] Beneficial effects: During the sample smoothing stage, the controller drives the lifting system to lower the clamping ring, and the pressure sensor indirectly monitors wrinkles. Vibration of the contact block and airflow assist in smoothing the sample, ensuring the flatness of the sample surface. During sample fixing, the pressure sensor continuously collects the pressure signal between the contact block and the sample, providing feedback on the sample's fixing status through the pressure value. After fixing is complete, the controller immediately stops the lifting system, achieving precise pressure control and preventing sample deformation or insecure fixing due to overpressure. During the air permeability testing stage, the controller automatically adjusts the airflow pressure or flow rate of the air path system based on the parameters input to the touchscreen display. The airflow monitoring system collects data in real time and transmits it to the controller for analysis and calculation. Signal linkage between various systems ensures stable output of test parameters and accurate data acquisition. Finally, the controller compiles the test results into a visual report and supports export and printing. Attached Figure Description

[0027] Figure 1 This is an isometric view of an embodiment of the intelligent textile air permeability testing device of the present invention; Figure 2 This is a front cross-sectional view of the compression ring in an embodiment of the intelligent textile air permeability testing device of the present invention; Figure 3 This is an appendix to an embodiment of the intelligent textile air permeability testing device of the present invention. Figure 2 Detailed drawing at point A; Figure 4 This is a front cross-sectional view of the pressing ring of an embodiment of the intelligent textile air permeability testing device of the present invention when it is pressed down; Figure 5 This is a top sectional view of the compression ring in an embodiment of the intelligent textile air permeability testing method of the present invention; Figure 6 This is a step diagram illustrating an embodiment of the intelligent textile air permeability testing method of the present invention.

[0028] The reference numerals in the accompanying drawings of the instruction manual include: 1. Machine body; 2. Sample ring; 3. Clamping ring; 4. Lifting system; 5. Limiting block; 6. Limiting groove; 7. Pressure sensor; 8. One-way valve; 9. Through hole; 10. One-way pressure relief valve; 11. Control groove; 12. Electric cylinder; 13. Displacement sensor; 14. Spring; 15. Contact block. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] The following detailed description illustrates the specific implementation method: Example 1:

[0033] As attached Figure 1 As shown: An intelligent textile air permeability testing device includes a body 1, on which are mounted a sample ring 2, a clamping ring 3, a lifting system 4, an air path system, an airflow monitoring system, and a controller. The body 1 is equipped with a touch screen display, which is connected to the controller. The air path system, airflow monitoring system, and controller are all designed with reference to the Darong Textile Instrument YG(B)461E fabric air permeability tester. During the air permeability testing of textile samples, the textile is manually placed on the sample ring 2. The lifting system 4 controls the clamping ring 3 to descend and clamp the textile sample. During manual placement, if the textile sample is uneven and has wrinkles, the wrinkles will change the airflow path, causing increased airflow resistance in some areas and decreased airflow resistance in others. This results in the measured airflow or pressure difference not accurately reflecting the actual air permeability of the textile, thus affecting the accuracy of the test results. To reduce wrinkles during the placement of textile samples and improve monitoring accuracy, as shown in the attached document... Figure 2 Appendix Figure 3 and attached Figure 5As shown, the bottom of the clamping ring 3 has several evenly arranged control grooves 11 along its circumference. Each control groove 11 has a sliding contact block 15 (a buffer pad is attached to the side of the contact block 15 near the sample ring 2 to reduce the impact force between the contact block 15 and the sample surface). Each contact block 15 has a pressure sensor 7 embedded in its bottom. The pressure sensor 7 is connected to the controller signal. The preferred model of the pressure sensor is Ruizhichen MEMS pressure sensor. Each control groove 11 is equipped with a control component for controlling the up and down movement of the contact block 15. Each contact block 15 is equipped with an auxiliary component for smoothing out wrinkles. Specifically, as shown in the attached document Figure 3 As shown, the control components all include electric cylinders 12. The top of each electric cylinder 12 is fixedly connected to the inner top wall of the corresponding control slot 11 by bolts. The output shaft of each electric cylinder 12 is fixedly connected to the top of the corresponding contact block 15 by bolts. Each electric cylinder 12 is connected to the controller signal. The preferred model of the electric cylinder 12 is the Aurotek DH RCEA miniature rod-type electric cylinder from Hechun Technology. A spring 14 is sleeved on the output shaft of the electric cylinder 12. As attached Figure 3 As shown, the auxiliary components all include several through holes 9 opened along the height direction of the contact block 15. One-way valves 8 are provided on the side of the through holes 9 near the sample ring 2. Limiting blocks 5 are fixedly connected to both sides of the contact block 15 by bolts. Several limiting grooves 6 corresponding to the limiting blocks 5 are opened on the inner wall of the control groove 11. The inner wall of the limiting groove 6 and the surface of the limiting block 5 are coated with polytetrafluoroethylene. When the top of the limiting block contacts the top wall of the corresponding limiting groove, the bottom of the corresponding contact block 15 and the bottom of the clamping ring 3 are on the same horizontal plane.

[0034] The specific implementation process is as follows: When conducting the air permeability test of textiles, the textile sample is first placed manually on the sample ring 2 of the machine body 1. At this time, the test process is started. The controller will first control the lifting system 4 to drive the clamping ring 3 to descend towards the sample. Since it is difficult to ensure that the sample is completely flat when placed manually, if there are wrinkles or arches, when the contact block 15 at the bottom of the clamping ring 3 first contacts these uneven areas, the pressure sensor 7 at the bottom of the contact block 15 detects the pressure change. The pressure sensor 7 will transmit the pressure signal to the controller in real time. The controller will locate the specific location of the wrinkles on the sample by analyzing the pressure data fed back by each contact block 15. After identifying the wrinkled area, the controller sends a command to the corresponding electric cylinder 12. The output shaft of the electric cylinder 12 begins to reciprocate and extend, thereby driving the corresponding contact block 15 to move up and down in the control groove 11. The up and down movement of the contact block 15 vibrates the wrinkled area. This vibration mimics the action of smoothing by hand, so that the textile fibers in the wrinkled area gradually unfold and reduce local accumulation. As the contact block 15 moves up and down, it compresses the air in the control groove 11. When the contact block 15 moves upward, the space in the control groove 11 is compressed, and the air pressure increases. At this time, the one-way valve 8 in the through hole 9 is open, and the compressed air is ejected at high speed, directly acting on the wrinkled area below. The impact force of the airflow further blows open and smooths the wrinkles. The high-speed airflow can not only disperse the fiber clumps accumulated on the surface, but also penetrate into the pores inside the fabric, expanding and flattening the deep wrinkles. At the same time, the directionality and diffusion of the airflow help to flatten the raised parts of the sample edge. The airflow is evenly spread across the surface of the sample ring 2, avoiding minor unevenness that might be missed by mechanical vibration. When the contact block 15 moves downward, the space inside the control groove 11 increases, creating negative pressure. The one-way valve 8 automatically closes, and external air enters the control groove 11 through the one-way pressure relief valve 10 to replenish it, preparing for the next airflow. Through the dual action mechanism of vibration and airflow, the efficiency of eliminating wrinkles on the sample surface is improved. Furthermore, the airflow acting on the sample can disperse impurities and dust on the sample, reducing the risk of impurities clogging the sample pores and interfering with the air permeability test, thereby further improving the accuracy of the test. As the contact block 15 smooths the sample, the pressure values ​​fed back by each pressure sensor 7 gradually become consistent, indicating that the wrinkles on the sample surface have been eliminated. At this point, the controller will stop the electric cylinder 12, keeping the bottom of the contact block 15 flush with the bottom of the clamping ring 3. Then, the clamping ring 3 continues to descend until it is in contact with the sample ring 2, as shown in the attached diagram. Figure 4 As shown, the textile sample is clamped and fixed in a flat state, avoiding abnormal airflow paths caused by wrinkles. This ensures that the airflow output by the subsequent air path system can pass evenly through all areas of the sample. The airflow and pressure difference data collected by the airflow monitoring system can accurately reflect the actual air permeability of the textile. Finally, the controller analyzes and processes this precise data to calculate accurate air permeability indicators and displays the test results on a touch screen, greatly improving the accuracy and reliability of the test results.

[0035] Example 2:

[0036] As attached Figure 2 and attached Figure 3 As shown, the difference from Embodiment 1 is that the bottom of the clamping ring 3 is embedded with several displacement sensors 13 corresponding to the control groove 11. The displacement sensors 13 are all connected to the controller signal, and the preferred model of the displacement sensors 13 is SCAIME PTSC1 displacement sensor 13. The displacement sensors monitor the displacement of the clamping ring to reflect the distance between the bottom of the clamping ring and the top of the sample frustum, thereby controlling the maximum displacement of the contact block to avoid collision between the contact block and the sample during the movement.

[0037] Example 3:

[0038] As attached Figure 5 As shown, an intelligent method for testing the air permeability of textiles includes the following steps: S1: Sample Placement: Unfold the textile sample and place it on the sample ring 2; S2: Sample smoothing: The lifting system 4 is controlled by the controller to drive the clamping ring 3 to descend. When the contact block 15 contacts the wrinkles and arches of the sample during the descent, the corresponding pressure sensor 7 detects the pressure signal and transmits it to the controller. The controller controls the electric cylinder 12 to drive the corresponding contact block 15 to move up and down in a cyclical manner to smooth the wrinkles. When the contact block 15 moves up and down, it squeezes the air inside the control groove 11 so that it acts on the sample through the through hole 9, and then the sample is further unfolded and flattened by the airflow. S3: Sample fixing: The pressure signal between the contact block 15 and the sample is monitored in real time by the pressure sensor 7. The pressure value between the contact block 15 and the sample reflects the fixing status of the sample. Then, the lifting system 4 is stopped by the controller to complete the sample fixing. S4: Parameter setting: After the sample is fixed, input the detection parameters to the controller via the touch display, including the preset pressure difference, flow rate and detection time; the controller starts the gas circuit system according to the parameter instructions and adjusts the air pressure or flow rate to the set value; S5: Air permeability test: After the air path system outputs airflow stably, the airflow monitoring system collects the airflow rate and pressure difference data of the sample in real time and transmits the data to the controller; the controller analyzes and processes the data and calculates the air permeability performance index of the textile. S6: Data Output: After the test is completed, the controller organizes the air permeability test results data and displays the test report on the touch screen. It also supports data export and printing, thus completing the entire test process.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An intelligent textile air permeability testing device, comprising a body (1), wherein the body (1) is provided with a sample ring (2), a clamping ring (3), a lifting system (4), an air path system, an airflow monitoring system, and a controller, characterized in that: The bottom of the clamping ring (3) has several evenly arranged control grooves (11) along its circumference. Each control groove (11) has a sliding contact block (15). Each contact block (15) has a pressure sensor (7) embedded in its bottom. Each pressure sensor (7) is connected to the controller signal. Each control groove (11) is provided with a control component for controlling the up and down movement of the contact block (15). Each contact block (15) is provided with an auxiliary component for helping to smooth out wrinkles.

2. The intelligent textile air permeability testing device according to claim 1, characterized in that: All control components include an electric cylinder (12), the top of which is fixedly connected to the inner top wall of the corresponding control slot (11), the output shaft of which is fixedly connected to the top of the corresponding contact block (15), and the electric cylinder (12) is connected to the controller signal.

3. The intelligent textile air permeability testing device according to claim 1, characterized in that: The auxiliary components all include several through holes (9) opened along the height direction of the contact block (15). One-way valves (8) are provided on the side of the through holes (9) near the sample ring (2). One-way pressure relief valves (10) are connected to the side wall of the control groove (11).

4. The intelligent textile air permeability testing device according to claim 3, characterized in that: Both sides of the contact block (15) are fixedly connected to limit blocks (5), and the inner wall of the control groove (11) is provided with several limit grooves (6) corresponding to the limit blocks (5). When the top of the limit block (5) contacts the inner top wall of the corresponding limit groove (6), the bottom of the corresponding contact block (15) and the bottom of the clamping ring (3) are on the same horizontal plane.

5. The intelligent textile air permeability testing device according to claim 4, characterized in that: The contact block (15) is fixedly connected to a buffer pad on the side near the sample ring (2).

6. The intelligent textile air permeability testing device according to claim 2, characterized in that: A spring (14) is fitted on the output shaft of the electric cylinder (12).

7. The intelligent textile air permeability testing device according to claim 4, characterized in that: The inner wall of the limiting groove (6) and the surface of the limiting block (5) are both coated with polytetrafluoroethylene.

8. The intelligent textile air permeability testing device according to claim 4, characterized in that: The bottom of the clamping ring (3) is embedded with several displacement sensors (13) corresponding to the control slot (11), and the displacement sensors (13) are all connected to the controller signal.

9. The intelligent textile air permeability testing device according to claim 1, characterized in that: The machine body (1) is equipped with a touch display, which is connected to the controller signal.

10. An intelligent method for testing the air permeability of textiles, operating based on the structure of the intelligent textile air permeability testing device according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Sample placement: Unfold the textile sample and place it on the sample ring (2); S2: Sample smoothing: The lifting system (4) is controlled by the controller to drive the clamping ring (3) to descend. When the contact block (15) contacts the wrinkles and arches of the sample during the descent, the corresponding pressure sensor (7) detects the pressure signal and transmits it to the controller. The controller controls the electric cylinder (12) to drive the corresponding contact block (15) to move up and down in a cyclical manner to smooth the wrinkles. When the contact block (15) moves up and down, it squeezes the air inside the control groove (11) so that it acts on the sample through the through hole (9), and then the sample is further spread out and flattened by the airflow. S3: Sample fixing: The pressure signal between the contact block (15) and the sample is monitored in real time by the pressure sensor (7). The pressure value between the contact block (15) and the sample reflects the fixing status of the sample. Then, the lifting system (4) is controlled by the controller to stop moving and the sample fixing is completed. S4: Parameter setting: After the sample is fixed, input the detection parameters to the controller via the touch display, including the preset pressure difference, flow rate and detection time; the controller starts the gas circuit system according to the parameter instructions and adjusts the air pressure or flow rate to the set value; S5: Air permeability test: After the air path system outputs airflow stably, the airflow monitoring system collects the airflow rate and pressure difference data of the sample in real time and transmits the data to the controller; the controller analyzes and processes the data and calculates the air permeability performance index of the textile. S6: Data Output: After the test is completed, the controller organizes the air permeability test results data and displays the test report on the touch screen. It also supports data export and printing, thus completing the entire test process.

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