A pps-based cloth air permeability detection device

Abstract

This invention relates to the field of textile air permeability testing technology, specifically to a PPS base fabric air permeability testing device, comprising a lower testing cylinder and an upper testing cylinder. The lower testing cylinder contains a testing chamber, and the upper testing cylinder contains a sample processing chamber. A driving assembly is mounted on the lower testing cylinder. A sliding plate is installed inside the testing chamber, and a return spring is located at the bottom of the testing chamber. An infrared laser ranging sensor is also located at the bottom of the testing chamber. A horizontal groove is formed on the side wall of the upper testing cylinder. An "L"-shaped sample processing plate, divided into a horizontal and a vertical section, is located inside the sample processing chamber. A blower head with an air outlet is located on one side wall of the testing cylinder. This invention, through the cooperation of the "L"-shaped sample processing plate, the blower head, and a first electromagnet, replaces the traditional manual shaking or blowing cleaning method, effectively avoiding the differences in results caused by varying experience and force during manual cleaning.

Description

Technical Field

[0001] This invention relates to the field of textile air permeability testing technology, specifically to a PPS base fabric air permeability testing device. Background Technology

[0002] Existing air permeability testing equipment (such as the YG461E fabric air permeability meter) typically operates on the principle of measuring airflow under constant pressure differential while holding the sample. However, during the production and storage of PPS base fabric, two types of contaminants easily adhere to its surface and fiber gaps: dust particles from the workshop environment and broken fiber fuzz generated by needle punching or hydroentangling processes. These adhered dust particles and fuzz partially block the airflow channels of the base fabric, resulting in a significantly lower measured air permeability value than the actual air permeability performance of the base fabric, thus causing systematic testing errors.

[0003] To address the aforementioned issues, the industry currently predominantly employs manual pretreatment methods. Operators must manually shake the base fabric sample, use compressed air to blow away surface contaminants, or use adhesive rollers to clean the surface before testing. These manual cleaning methods have significant shortcomings: First, the cleaning effectiveness is highly dependent on the operator's experience and sense of responsibility; the shaking amplitude, blowing angle, and force lack quantifiable standards, resulting in poor reproducibility of test results for the same batch of samples. Second, the manual cleaning process increases the complexity and time consumption of the testing procedure, making it difficult to adapt to the demands of automated, high-throughput online testing.

[0004] To address this, a PPS base fabric air permeability testing device is proposed. This device automatically, efficiently, and in a standardized manner removes dust and fiber fuzz from the surface of the PPS base fabric, thereby eliminating the interference of contaminants on the test results, improving the accuracy and efficiency of the test, and meeting the quality monitoring requirements of continuous production lines. Summary of the Invention

[0005] The purpose of this invention is to provide a PPS base fabric air permeability testing device to solve the problems mentioned in the background art, such as poor results and inconsistent standards of manually processed base fabric samples, and the difficulty of adapting manually processed samples to the needs of automated, high-throughput online testing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A PPS base fabric breathability testing device includes a lower testing cylinder and an upper testing cylinder. The lower testing cylinder has an upward-opening testing chamber, and the upper testing cylinder has a downward-opening sample processing chamber. The openings of the testing chamber and the sample processing chamber are aligned. A driving assembly is provided on the lower testing cylinder. The driving assembly can be a cylinder, an electric cylinder, or other device or mechanism capable of driving an object to move linearly up and down. The driving assembly is used to move the upper testing cylinder closer to or away from the lower testing cylinder. The opening end face of the testing chamber forms a sample mounting plane for placing a base fabric sample. A sliding plate is vertically slidably mounted inside the testing chamber. A return spring is provided between the sliding plate and the bottom of the testing chamber. An infrared laser rangefinder sensor for detecting the movement of the sliding plate is also provided at the bottom of the testing chamber. A horizontal groove is formed on the side wall of the upper testing cylinder. An "L"-shaped sample processing plate is provided inside the sample processing chamber. The "L"-shaped sample processing plate is divided into a horizontal part and a vertical part. The horizontal part extends out of the sample processing cavity through the slide groove and can slide along the slide groove. The vertical part faces the detection cavity vertically, and the bottom of the vertical part is flush with the bottom of the upper detection cylinder. A blower head is provided on the side wall of the upper detection cylinder where the slide groove is located. The blower head is provided with a blower nozzle. The blower head is connected to an external air supply device and is used to provide detection airflow to the sample processing cavity. The blower nozzle is set facing the vertical part. A first electromagnet is provided on the side wall of the upper detection cylinder opposite to the blower head. A first permanent magnet corresponding to the first electromagnet is provided on the vertical part.

[0007] By setting up an "L"-shaped sample processing plate in conjunction with a blower head and a first electromagnet, automated scraping and cleaning of the base fabric sample surface is achieved. When the device is started, an external air supply device supplies air to the blower head. The airflow from the blower head first acts on the vertical part of the sample processing plate, using the air force to push the vertical part to overcome the initial adhesion resistance, causing it to slide horizontally along the inner wall of the sample processing chamber toward the first electromagnet.

[0008] Since the bottom of the vertical section is flush with the bottom of the upper detection cylinder, when the drive assembly lowers the upper detection cylinder and closes it with the sample mounting plane of the lower detection cylinder, the bottom of the vertical section is in close contact with the surface of the base fabric sample placed on the sample mounting plane. As the vertical section slides, its bottom edge continuously and evenly scrapes the surface of the base fabric sample, effectively pushing and gathering the fibers and dust adhering to the surface of the base fabric towards the side of the first electromagnet.

[0009] Meanwhile, during the scraping process, the vertical part's own movement generates a certain vibration on the base fabric sample. This vibration can cause any fibers or fuzz that may be present on the bottom surface of the base fabric sample to fall off and fall into the detection chamber of the lower detection cylinder, thus avoiding the potential impact of the bottom surface attachments on subsequent air permeability testing.

[0010] During this process, the vertical section itself also acts as a physical barrier, separating the scraped fibers and lint from the air outlet and preventing them from being directly blown into other areas of the sample processing chamber by the airflow, thus ensuring that the cleaned contaminants can be effectively guided to specific areas.

[0011] Furthermore, the placement of the first electromagnet and the first permanent magnet on the vertical section further ensures the travel distance of the vertical section. When the vertical section approaches the first electromagnet under the action of wind, the first electromagnet is energized and generates a magnetic force that attracts the first permanent magnet, ensuring that the vertical section can move accurately and stably into position, thereby performing a comprehensive scraping and cleaning of the entire base fabric sample surface, avoiding the problem of incomplete cleaning caused by insufficient wind or changes in resistance.

[0012] After the base fabric sample is cleaned, airflow passes over it and blows onto a sliding plate. The plate slides downwards due to the airflow, and an infrared laser rangefinder detects and records the maximum displacement. The air permeability of the base fabric sample is determined by this displacement; a larger displacement indicates more airflow. The infrared laser rangefinder makes the entire device a complete intelligent sensing system, enabling automated and intelligent detection of the air permeability of the base fabric sample. After the air permeability test of the base fabric sample is completed, the current direction of the first electromagnet is switched to generate a magnetic force that repels the first permanent magnet, which can drive the vertical part to reset smoothly and prepare for the next test.

[0013] The sample processing plate replaces the traditional manual cleaning method, automating the cleaning process. The scraping force and range are precisely controlled by the equipment structure, ensuring the consistency and reliability of each cleaning operation. This effectively avoids the differences in cleaning results caused by factors such as experience and force during manual cleaning, and improves the accuracy of PPS base fabric ventilation performance testing.

[0014] Preferably, the sample processing plate has a hollow drain channel inside, the bottom surface of the horizontal part has an exhaust port that is connected to the drain channel, the lower side of the vertical part facing the blower head has an air inlet that is flush with the blower head and is connected to the drain channel, and when the vertical part is in contact with the side wall of the upper detection cylinder where the first electromagnet is located, the exhaust port is located inside the sample processing cavity.

[0015] By setting a hollow drain channel inside the sample processing plate and opening an exhaust port connected to the drain channel on the bottom surface of the horizontal part, and opening an air inlet connected to the drain channel on the lower side of the vertical part facing the blower head, and making the blower head flush with the air inlet, the scraping cleaning and airflow cleaning are combined, and the base fabric sample that has been scraped and processed is cleaned a second time by airflow.

[0016] When the vertical part slides towards the first electromagnet under the action of wind and magnetic force, and scrapes the surface of the base fabric sample, the airflow blown out by the blower not only provides the initial power for the movement of the vertical part, but also blows directly onto the area of ​​the base fabric sample surface that has been scraped.

[0017] Because the air inlet is located on the lower side of the vertical section facing the blower head and is flush with the blower head, the airflow, after passing over the surface of the base fabric sample, can carry away residual fibers, lint, and dust, which then enter the exhaust duct from the air inlet and are finally discharged from the exhaust port outside the sample processing chamber. As the vertical section continues to move, the exhaust port on the horizontal section also moves horizontally into the sample processing chamber within the chute. When the vertical section finally comes into contact with the side wall of the upper detection cylinder where the first electromagnet is located, the exhaust port has just moved completely into the sample processing chamber. At this point, the airflow forms a complete circulation path inside the sample processing chamber and finally blows vertically downwards onto the base fabric sample, officially entering the air permeability testing stage of the base fabric sample.

[0018] This design not only allows for a secondary cleaning of the base fabric sample to ensure the accuracy of the test, but also allows for a change in the direction of the airflow after the secondary cleaning, so that the airflow blows vertically downwards onto the base fabric sample. This ensures that the airflow can pass through the base fabric sample to the maximum extent during the breathability test, avoiding a small airflow through the base fabric sample due to the air outlet being parallel to the base fabric sample, thus further guaranteeing the accuracy of the test.

[0019] Preferably, the blower head is cylindrical, and the cylindrical blower head is arranged along the width direction of the upper detection cylinder and rotatably connected to the side wall of the upper detection cylinder. The blower head is provided with a torsion spring, which is used to keep the blower nozzle horizontally facing the air inlet. A detection air passage is opened on the side wall of the upper detection cylinder where the blower head is located. The detection air passage is located above the blower nozzle and is connected to the slide groove. A detection air outlet is provided on the horizontal part. When the vertical part is in contact with the side wall of the upper detection cylinder where the first electromagnet is located, the detection air outlet is connected to the detection air passage. A second electromagnet is also fixedly installed on one side inner wall of the detection cavity where the blower head is located. The second electromagnet is located above the blower head. A second permanent magnet corresponding to the second electromagnet is provided on the blower head. A valve plate is rotatably installed in the sewage channel located in the vertical part. The valve plate is only allowed to deflect upward and closes the sewage channel in its natural state.

[0020] By designing the blower head as a cylinder and rotating it to the side wall of the upper detection cylinder, and in conjunction with a torsion spring, a second electromagnet, and a second permanent magnet, the airflow direction of the blower nozzle is intelligently switched between the cleaning and detection stages. In the initial sample cleaning stage, the force of the torsion spring keeps the blower nozzle horizontally facing the air inlet, ensuring that the blown airflow effectively pushes the vertical section to slide and carries residual fibers into the air inlet, completing scraping and secondary airflow cleaning. Under normal conditions, the valve plate closes the drain channel under gravity. After the airflow enters the drain channel, the airflow pushes the valve plate upwards, opening it and allowing the airflow to pass through and carry residual fibers out of the sample processing chamber.

[0021] When the vertical section is fully aligned with the side wall of the upper detection cylinder where the first electromagnet is located under magnetic force, indicating that sample cleaning is complete, the detection air vent on the horizontal section is now connected to the detection air passage. Simultaneously, the second electromagnet, energized, generates magnetic force, repelling the second permanent magnet on the blower head. The repulsive force between the second electromagnet and the second permanent magnet overcomes the spring force of the torsion spring, causing the blower head to rotate upwards around its axis, bringing the originally horizontal air vent upwards to a position where it aligns with the detection air passage. At this point, the airflow supplied by the external air supply equipment no longer blows horizontally but instead enters the detection air passage. After moving upwards, the airflow flows through the detection air vent into the drain channel of the horizontal section. Since the valve plate in the drain channel only allows upward deflection, it naturally closes the drain channel. Therefore, the airflow can only be blown downwards into the sample processing chamber from the exhaust port that has already entered the sample processing chamber, with the airflow direction perpendicular to the base fabric sample. This ensures that the airflow during the ventilation testing stage can pass vertically and stably through the base fabric sample, completely eliminating the interference that horizontal airflow during the cleaning stage might cause to the test results, further improving the accuracy and reliability of the test.

[0022] Preferably, the vertical part has an adsorption port on the side facing the first electromagnet, the adsorption port is connected to the sewage channel, and the adsorption port is aligned with the air inlet, and a partition is provided between the adsorption port and the air inlet.

[0023] By opening an adsorption port on the side of the vertical part facing the first electromagnet, which is connected to the sewage channel and aligned with the air inlet, and setting a partition between the adsorption port and the air inlet, the Venturi effect is utilized to further enhance the removal effect of scraped fibers, hairs and dust.

[0024] When the airflow from the blower passes horizontally through the partition area between the air inlet and the adsorption port, the airflow forms a high-speed flow area at the air inlet due to the obstruction effect of the partition. According to the Venturi effect, the high-speed airflow creates a local low-pressure area near the adsorption port. At this time, the fibers and dust that accumulate on the side of the first electromagnet during the vertical scraping process are actively sucked into the adsorption port under the pressure difference between atmospheric pressure and the low-pressure area of ​​the adsorption port, and enter the exhaust duct. Finally, they are discharged from the sample processing chamber through the exhaust port along with the residual pollutants carried by the airflow entering from the air inlet.

[0025] This design allows the scraped contaminants to not only be physically pushed and gathered, but also to be efficiently removed through the adsorption of airflow. This avoids secondary pollution that may be caused by the accumulation of contaminants in specific areas of the sample processing chamber, significantly improving the thoroughness of cleaning and providing a cleaner sample surface environment for subsequent ventilation testing.

[0026] Preferably, an automatic winding reel is provided on the side of the vertical part facing the blower head, and a blocking cloth is wound inside the automatic winding reel. A third permanent magnet corresponding to the second electromagnet is fixedly connected to one end of the blocking cloth extending out of the automatic winding reel. When the third permanent magnet is attracted to the second electromagnet and the vertical part is in contact with the side wall of the upper detection cylinder where the first electromagnet is located, a guide channel is formed between the blocking cloth and the base cloth sample.

[0027] By setting an automatic winding reel on the vertical side facing the blower head and winding up the blocking cloth inside the automatic winding reel, while fixing the extended end of the blocking cloth to a third permanent magnet corresponding to the second electromagnet, the effective control of the airflow diffusion range during the cleaning stage is achieved, further preventing fiber fuzz from scattering in the sample processing chamber when the blower performs secondary cleaning on the base cloth sample.

[0028] Initially, the third permanent magnet is attracted to the second electromagnet under magnetic force, and the blocking cloth is automatically wound up inside the reel. When the equipment is started, as the vertical part slides horizontally towards the first electromagnet under the action of wind and magnetic force, the blocking cloth is gradually pulled out and unfolded from the reel because the third permanent magnet is fixed to the second electromagnet. The unfolded blocking cloth forms a physical barrier between the vertical part and the side wall of the upper detection cylinder where the second electromagnet is located, together with the surface of the base cloth sample, forming a relatively closed guide channel.

[0029] This guiding channel can confine the horizontal airflow from the blower head and the fiber fuzz remaining on the surface of the base fabric sample after vertical scraping to a specific area. This effectively prevents the airflow from directly blowing the fiber fuzz to other corners of the sample processing chamber, and prevents these contaminants from falling back onto the cleaned base fabric sample surface due to airflow disturbance during the testing process. This ensures the cleanliness of the base fabric sample surface and provides further assurance for the accuracy of subsequent air permeability testing.

[0030] Once the sample cleaning is complete, the second electromagnet is energized to rotate the blower head, generating a magnetic force that repels the third permanent magnet. Under this repulsive force, the third permanent magnet separates from the second electromagnet. At this point, the restoring force of the coil spring inside the automatic winding reel kicks in, quickly winding the blocking cloth back into the reel. This prevents the blocking cloth from interfering with the airflow during the subsequent air permeability testing stage, ensuring that the testing airflow can act vertically on the base fabric sample without obstruction.

[0031] Preferably, a blocking block is provided above the second electromagnet, the blocking block facing the first electromagnet and extending horizontally out of the end face of the second electromagnet.

[0032] By setting a blocking block above the second electromagnet, facing the direction of the first electromagnet and extending horizontally out of the end face of the second electromagnet, the third permanent magnet can be effectively limited, preventing it from accidentally detaching from the second electromagnet during the sample cleaning stage due to the impact of the airflow blown out of the blower or the inertia of the vertical part during movement.

[0033] During the cleaning phase, when the blower blows air horizontally, the airflow may exert an upward impact force on the blocking cloth. Without the restraint of the blocking block, the third permanent magnet may be pushed away from the adsorption position of the second electromagnet by the airflow and cause the third permanent magnet to detach from the second electromagnet, resulting in the blocking cloth being retracted into the automatic winding reel, thus affecting the formation effect of the guide channel.

[0034] The blocking block extends horizontally from the end face of the second electromagnet, forming a physical blockage above the third permanent magnet. Even under airflow impact or vertical movement, the third permanent magnet can stably adhere to the second electromagnet, ensuring that the blocking cloth can be smoothly and accurately pulled out and unfolded as the vertical part moves. This reliably constructs a guiding channel that restricts the spread of fiber hairs, further ensuring the stability and effectiveness of the cleaning process.

[0035] Preferably, a collection trough for collecting fiber fuzz is horizontally fixedly installed on the outside of the upper detection cylinder. The collection trough is located below and aligned with the slide trough, and liquid is disposed inside the collection trough.

[0036] By horizontally fixing a collection tank aligned with and below the chute on the outside of the upper detection cylinder and filling the collection tank with liquid, the fiber fuzz and dust discharged during the cleaning stage are collected and fixed in a concentrated manner, effectively preventing these pollutants from spreading back into the surrounding environment after being discharged from the equipment, causing pollution or affecting the health of operators.

[0037] As the horizontal section of the sample processing plate moves within the chute, the exhaust port discharges the airflow carrying fibers, lint, and dust outside the sample processing chamber. Because the collection tank is directly below the chute, the discharged airflow and its contaminants fall directly into the liquid within the collection tank. The viscosity and surface tension of the liquid quickly capture and wet the fibers, lint, and dust, causing them to lose their buoyancy and become stably fixed at the bottom of the collection tank. This prevents these lightweight contaminants from dispersing in the air, ensuring the cleanliness of the laboratory or testing environment.

[0038] At the same time, this design also facilitates the unified treatment and cleaning of pollutants. It only requires periodic replacement of the liquid in the collection tank, making the operation simple and convenient.

[0039] Preferably, an airflow sensor for detecting gas flow rate is provided between the valve plate and the air inlet, and a buzzer is provided on the top of the upper detection cylinder, the buzzer being electrically connected to the airflow sensor.

[0040] By installing an airflow sensor between the valve plate and the air inlet and electrically connecting it to the buzzer on the top of the upper detection cylinder, real-time monitoring and early warning of abnormalities of the valve plate's working status are achieved, effectively avoiding cleaning failures and detection errors caused by valve plate jamming.

[0041] During the sample cleaning stage, when the airflow from the blower carries fibers, lint, and dust into the air inlet and pushes the valve plate upward to open the drain channel, the airflow sensor detects the gas velocity passing through the air inlet in real time. Under normal circumstances, the valve plate can open smoothly, and the airflow velocity will be maintained within a relatively stable preset range.

[0042] If, during the cleaning process, fibers, lint, or larger dust particles accidentally become entangled or stuck at the valve plate's pivot, preventing the valve plate from opening smoothly or causing insufficient opening angle, the airflow entering the drain duct through the inlet will be significantly reduced. The flow rate detected by the airflow sensor will then fall below a preset threshold. The airflow sensor transmits this abnormal signal to the control unit, which then triggers an alarm to remind operators to promptly inspect and clean the valve plate, eliminate the blockage, and ensure stable equipment operation.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The PPS base fabric air permeability testing device designed in this invention replaces the traditional manual shaking or blowing cleaning method by setting up an "L"-shaped sample processing plate in conjunction with a blower head and a first electromagnet. The vertical part slides using air force, and its bottom edge continuously and evenly scrapes the surface of the base fabric sample, effectively collecting fiber fuzz and dust. The scraping force and range are precisely controlled by the device structure, ensuring the consistency and reliability of each cleaning operation, effectively avoiding the differences in results caused by manual cleaning due to variations in experience and force.

[0044] 2. This invention combines scraping cleaning with airflow cleaning. By setting up a drain channel, air inlet, and exhaust outlet, it achieves secondary removal of residual contaminants from scraping. Simultaneously, the blower head can intelligently switch airflow direction; during the cleaning phase, horizontal blowing assists in waste removal, while during the testing phase, vertical blowing ensures maximum airflow through the base fabric sample. An infrared laser rangefinder sensor monitors the slide plate displacement in real time, accurately determining ventilation performance based on the displacement amplitude, significantly improving testing accuracy.

[0045] 3. This invention, through the installation of an automatic winding reel and a blocking cloth, forms a guiding channel during the cleaning stage, confining the fibers and fuzz generated by scraping within a specific area and preventing contaminants from scattering and falling back onto the cleaned sample surface. Simultaneously, the liquid in the collection tank captures and fixes the discharged dust and fuzz, preventing them from spreading to the surrounding environment. The adsorption port actively draws in contaminants using the Venturi effect, further ensuring the cleanliness of the sample surface. Attached Figure Description

[0046] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 For the present invention Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the internal structure of the base fabric sample when the upper and lower detection cylinders clamp it together. Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram showing the state when the vertical part is in contact with the side wall where the first electromagnet is located in the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle; Figure 8 For the present invention Figure 6 Enlarged view of point D in the middle.

[0047] In the diagram: 1. Lower detection cylinder; 2. Upper detection cylinder; 3. Detection chamber; 4. Sample processing chamber; 5. Drive assembly; 6. Sample mounting plane; 7. Slide plate; 8. Reset spring; 9. Infrared laser rangefinder; 10. Slide groove; 11. Sample processing plate; 1101. Horizontal part; 1102. Vertical part; 12. Blower head; 13. Blower outlet; 14. First electromagnet; 15. First permanent magnet; 16. Drainage channel; 17. Exhaust port; 18. Inlet; 19. Torsion spring; 20. Detection air channel; 21. Detection air outlet; 22. Second electromagnet; 23. Second permanent magnet; 24. Valve plate; 25. Adsorption port; 26. Partition plate; 27. Automatic winding reel; 28. Blocking cloth; 29. ​​Third permanent magnet; 30. Guide channel; 31. Blocking block; 32. Collection groove; 33. Airflow sensor; 34. Buzzer; 35. Base cloth sample. Detailed Implementation

[0048] Please see Figures 1 to 8 This invention provides a device for testing the air permeability of PPS base fabric, the technical solution of which is as follows: A device for testing the air permeability of PPS base fabric, reference Figures 1 to 3 The system includes a lower detection cylinder 1 and an upper detection cylinder 2. The lower detection cylinder 1 has an upward-opening detection cavity 3, and the upper detection cylinder 2 has a downward-opening sample processing cavity 4. The openings of the detection cavity 3 and the sample processing cavity 4 are aligned with each other. A driving assembly 5 is provided on the lower detection cylinder 1. In this embodiment, the driving assembly 5 is an electric cylinder. The driving assembly 5 is used to move the upper detection cylinder 2 closer to or away from the lower detection cylinder 1. The opening end face of the detection cavity 3 forms a sample mounting plane 6 for placing the base fabric sample 35. A sliding plate 7 is vertically slidably installed inside the detection cavity 3. A return spring 8 is provided between the sliding plate 7 and the bottom of the detection cavity 3. An infrared laser ranging sensor 9 is also provided at the bottom of the detection cavity 3 for detecting the movement of the sliding plate 7. A horizontal groove 10 is opened on the side wall of the upper detection cylinder 2. An "L"-shaped sample processing plate 11 is provided inside the sample processing cavity 4. The "L"-shaped sample processing plate 11 is divided into a horizontal part 1101 and a vertical part 1102. The horizontal part 1101 passes through the groove 1102. The sample processing chamber 4 extends out of the sample processing chamber 4 and can slide along the slide groove 10. The vertical part 1102 is vertically oriented towards the detection chamber 3, and the bottom of the vertical part 1102 is flush with the bottom of the upper detection cylinder 2. A blower head 12 is provided on the side wall of the upper detection cylinder 2 where the slide groove 10 is located. The blower head 12 is provided with a blower nozzle 13. The blower head 12 is connected to an external air supply device and is used to provide detection airflow to the sample processing chamber 4. The blower nozzle 13 is oriented towards the vertical part 1102. A first electromagnet 14 is provided on the side wall of the upper detection cylinder 2 opposite to the blower head 12. A first permanent magnet 15 corresponding to the first electromagnet 14 is provided on the vertical part 1102.

[0049] refer to Figures 3 to 5The sample processing plate 11 has a hollow drain channel 16 inside, which runs along the vertical part 1102 and the horizontal part 1101. The bottom surface of the horizontal part 1101 has an exhaust port 17 connected to the drain channel 16. The vertical part 1102 has an air inlet 18 on its lower side facing the blower head 12, flush with the blower head 12. The air inlet 18 is connected to the drain channel 16. When the vertical part 1102 is in contact with the side wall of the upper detection cylinder 2 where the first electromagnet 14 is located, the exhaust port 17 is located inside the sample processing chamber 4. The vertical part 1102 has an adsorption port 25 on its side facing the first electromagnet 14, which is connected to the drain channel 16 and aligned with the air inlet 18. A partition 26 is provided between the adsorption port 25 and the air inlet 18.

[0050] refer to Figure 1 , Figure 2 A collection trough 32 for collecting fiber fuzz is horizontally fixed to the outside of the upper detection cylinder 2. The length of the collection trough 32 is the same as the maximum length of the horizontal part 1101 extending out of the sample processing chamber 4. The collection trough 32 is located below and aligned with the slide 10. The collection trough 32 contains liquid (not shown in the attached diagram of the instruction manual). The liquid can be water, or detergent can be added to the water to break the surface tension of the water, allowing the water to better capture the fiber fuzz.

[0051] refer to Figure 5 , Figure 6 and Figure 8 The blower head 12 is cylindrical and is positioned along the width of the upper detection cylinder 2, and is rotatably connected to the side wall of the upper detection cylinder 2. A torsion spring 19 is provided on the blower head 12 to keep the air outlet 13 horizontally facing the air inlet 18. A detection air passage 20 is provided on the side wall of the upper detection cylinder 2 where the blower head 12 is located. The detection air passage 20 is located above the air outlet 13 and communicates with the slide groove 10. A detection air outlet 21 is provided on the horizontal part 1101, and a vertical part 1102... When the upper detection cylinder 2 is in contact with the side wall of the first electromagnet 14, the detection air outlet 21 is connected to the detection air passage 20. A second electromagnet 22 is also fixedly installed on the inner wall of the detection chamber 3 where the blower head 12 is located. The second electromagnet 22 is located on the upper side of the blower head 12. A second permanent magnet 23 corresponding to the second electromagnet 22 is provided on the blower head 12. A valve plate 24 is rotatably installed in the sewage passage 16 located in the vertical part 1102. The valve plate 24 is only allowed to deflect upwards and closes the sewage passage 16 in its natural state.

[0052] refer to Figure 6 and Figure 8 An airflow sensor 33 for detecting gas flow rate is provided between the valve plate 24 and the air inlet 18. A buzzer 34 is provided on the top of the upper detection cylinder 2. The buzzer 34 is electrically connected to the airflow sensor 33.

[0053] In addition, refer to Figure 5 and Figure 6 An automatic winding reel 27 is provided on the side of the vertical part 1102 facing the blower head 12. In this embodiment, the automatic winding reel 27 uses a coil spring as the power source for automatic winding. In addition to using a coil spring for automatic winding, other types of power sources can also be used for the automatic winding reel 27, such as using a motor for winding. A blocking cloth 28 is wound inside the automatic winding reel 27. One end of the blocking cloth 28 extending out of the automatic winding reel 27 is fixedly connected to a third permanent magnet 29 corresponding to the second electromagnet 22. When the third permanent magnet 29 is attracted to the second electromagnet 22 and the vertical part 1102 is in contact with the side wall of the upper detection cylinder 2 where the first electromagnet 14 is located, a guide channel 30 is formed between the blocking cloth 28 and the base cloth sample 35. A blocking block 31 is provided above the second electromagnet 22. The blocking block 31 faces the first electromagnet 14 and extends horizontally out of the end face of the second electromagnet 22.

[0054] Working principle: When the device is running, refer to Figures 1 to 4 First, the PPS base fabric sample 35 to be tested is placed flat on the sample mounting plane 6 of the lower detection cylinder 1. Then, the drive assembly 5 is activated, moving the upper detection cylinder 2 downwards until the bottom of the upper detection cylinder 2 is in close contact with the surface of the base fabric sample 35, pressing the base fabric sample 35 onto the sample mounting plane 6. At this time, the sample processing chamber 4 and the detection chamber 3 together form a relatively closed space, with the base fabric sample 35 acting as a barrier separating the two.

[0055] refer to Figure 3 , Figure 4 and Figure 5 In the initial state, the vertical part 1102 of the "L"-shaped sample processing plate 11 is located inside the sample processing chamber 4 near the blower head 12. The third permanent magnet 29 is attracted to the second electromagnet 22, the blocking cloth 28 is wound up by the automatic winding reel 27, and the blocking block 31 above the second electromagnet 22 effectively limits the third permanent magnet 29. At this time, the detection air port 21 and the air outlet of the horizontal part 1101 extend out of the sample processing chamber 4, while the valve plate 24 in the drain duct 16 closes the drain duct 16 in its natural state.

[0056] refer to Figures 4 to 6When the sample cleaning stage begins, the external air supply device starts supplying air through the blower head 12. Initially, the blower nozzle 13 remains horizontal under the action of the torsion spring 19, and the airflow blows horizontally towards the air inlet 18 of the vertical part 1102. The airflow impacts the baffle 26 inside the air inlet 18, pushing the vertical part 1102 towards the direction of the first electromagnet 14. At this time, the first electromagnet 14 is activated, and the magnetic poles of the end of the first electromagnet 14 facing the first permanent magnet 15 are opposite to those of the end of the first permanent magnet 15 facing the first electromagnet 14. The attraction between the first electromagnet 14 and the first permanent magnet 15 also pulls the vertical part 1102 towards the direction of the first electromagnet 14. The vertical part 1102 then begins to slide horizontally towards the direction of the first permanent magnet 15.

[0057] refer to Figures 4 to 6 During the sliding process, the bottom edge of the vertical section 1102 continuously and evenly scrapes the surface of the base fabric sample 35 below, effectively collecting fibers, dust, and other debris adhering to the surface of the base fabric sample 35 into the sample processing cavity 4 between the first electromagnet 14 and the vertical section 1102. As the vertical section 1102 slides towards the first electromagnet 14, the displacement of the vertical section 1102 causes the blocking cloth 28 wound inside the automatic winding reel 27 to unfold due to the attraction between the third electromagnet and the second electromagnet 22. This unfolded blocking cloth 28 forms a guide channel 30 between itself and the base fabric sample 35. The guide channel 30 directly connects to the air outlet and the air inlet 18.

[0058] refer to Figure 1 as well as Figure 4 , Figure 6 As airflow continuously blows out of the air outlet 13 and enters the air inlet 18, the residual fibers and dust on the base fabric sample 35 that have been scraped by the vertical part 1102 are also driven into the air inlet 18 by the airflow. The airflow blows the valve plate 24 to rotate upward and open. The airflow is discharged from the exhaust port 17 on the horizontal part 1101 along the drain duct 16 and sprayed into the collection tank 32, so that the fibers and dust come into contact with the liquid in the collection tank 32. In this way, the fibers and dust will be captured by the liquid in the collection tank 32.

[0059] refer to Figure 5 When the airflow enters the air inlet 18 and moves upward along the drain 16, due to the Venturi effect, the fibers and dust that are scraped and accumulated between the first electromagnet 14 and the vertical part 1102 by the vertical part 1102 will also be sucked into the drain 16 from the adsorption port 25 due to the pressure difference, and will also be discharged into the collection tank 32 along with the airflow.

[0060] In this process, refer to Figure 6 and Figure 8An airflow sensor 33, located between the valve plate 24 and the air inlet 18, monitors the gas flow rate in real time. If the valve plate 24 cannot open normally or its opening is insufficient due to obstruction by foreign objects, and the flow rate detected by the airflow sensor 33 is lower than a preset threshold, the buzzer 34 on the top of the upper detection cylinder 2 will be triggered to sound an alarm, prompting the operator to handle the situation.

[0061] When the vertical part 1102 is in contact with the inner wall of the upper detection cylinder 2 where the first electromagnet 14 is located, the exhaust port 17 just enters the sample processing chamber 4, and the detection air vent 21 and the detection air passage 20 are also aligned. At this time, the cleaning process of the base fabric sample 35 is completed.

[0062] After the cleanup phase is completed, refer to Figure 4 , Figure 5 and Figure 6 The system then switches to the air permeability testing stage for the base fabric sample 35. At this time, the second electromagnet 22 is activated. Upon activation, the end of the second electromagnet 22 facing the second permanent magnet 23 generates a repulsive magnetic force against the second permanent magnet 23 on the blower head 12, and the end facing the third permanent magnet 29 also generates a repulsive magnetic force against the third permanent magnet 29. The third permanent magnet 29 disengages from the second electromagnet 22. At this point, the restoring force of the coil spring within the automatic winding reel 27 begins to function, quickly winding the blocking cloth 28 back into the automatic winding reel 27.

[0063] Meanwhile, reference Figures 4 to 7 Under the magnetic force of the second electromagnet 22 and the second permanent magnet 23, the blower head 12 overcomes the elastic force of the torsion spring 19 and rotates upward, causing the blower nozzle 13 to change from a horizontal orientation to a vertical orientation, and the blower nozzle 13 rotates to be aligned with the detection air passage 20. The airflow blown out of the blower nozzle 13 enters the drain passage 16 through the detection air outlet 21 along the detection air passage 20. At this time, since the valve plate 24 cannot rotate downward, the valve plate 24 closes the drain passage 16 at the vertical part 1102, that is, the airflow cannot be discharged from the drain passage 16 from the air inlet 18. The airflow can only be discharged downward into the sample processing chamber 4 from the exhaust port 17, which has been moved into the sample processing chamber 4. The discharged airflow is perpendicular to the base fabric sample 35.

[0064] refer to Figure 6 Airflow from exhaust port 17 blown towards the base fabric sample 35 passes through the base fabric sample 35 and enters the detection chamber 3 below. The airflow entering the detection chamber 3 acts on the slide plate 7, overcoming the elastic force of the return spring 8 and pushing the slide plate 7 vertically downward. The infrared laser rangefinder 9 at the bottom of the detection chamber 3 monitors the displacement of the slide plate 7 in real time and transmits the data to the control unit. The control unit determines the ventilation performance of the PPS base fabric sample 35 based on the displacement amplitude.

[0065] After the test is completed, the air supply to the blower 13 stops, the second electromagnet 22 is de-energized, and the blower head 12 rotates downwards and resets under the force of the torsion spring 19, causing the blower 13 to face the air inlet 18 again. Meanwhile, the first electromagnet 14 changes the direction of the current, generating opposite magnetic poles. The first electromagnet 14 and the first permanent magnet 15 generate a repulsive magnetic force, pushing the vertical part 1102 back towards the blower 13. Finally, the third permanent magnet 29 is also re-attracted to the second electromagnet 22. Then, the drive assembly 5 drives the upper detection cylinder 2 to rise and reset, removing the tested base fabric sample 35, completing the entire testing process.

[0066] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A device for testing the air permeability of PPS base fabric, characterized in that, The device includes a lower detection cylinder (1) and an upper detection cylinder (2). The lower detection cylinder (1) has an upward-opening detection cavity (3), and the upper detection cylinder (2) has a downward-opening sample processing cavity (4). A driving assembly (5) is provided on the lower detection cylinder (1). The driving assembly (5) is used to drive the upper detection cylinder (2) closer to or away from the lower detection cylinder (1). The opening end face of the detection cavity (3) forms a sample mounting plane (6) for placing a base fabric sample (35). A sliding plate (7) is vertically slidably installed inside the detection cavity (3). A reset spring (8) is provided between the sliding plate (7) and the bottom of the detection cavity (3). An infrared laser ranging sensor (9) is also provided at the bottom of the detection cavity (3). A sliding groove (10) is horizontally opened on the side wall of the upper detection cylinder (2). An "L" is provided inside the sample processing cavity (4). The "L"-shaped sample processing plate (11) is divided into a horizontal part (1101) and a vertical part (1102). The horizontal part (1101) extends out of the sample processing cavity (4) through the slide groove (10). The vertical part (1102) is vertically oriented towards the detection cavity (3), and the bottom of the vertical part (1102) is flush with the bottom of the upper detection cylinder (2). A blower head (12) is provided on the side wall of the upper detection cylinder (2) where the slide groove (10) is located. A blower nozzle (13) is provided on the blower head (12). The blower nozzle (13) is oriented towards the vertical part (1102). A first electromagnet (14) is provided on the side wall of the upper detection cylinder (2) opposite to the blower head (12). A first permanent magnet (15) corresponding to the first electromagnet (14) is provided on the vertical part (1102).

2. The PPS base fabric air permeability testing device according to claim 1, characterized in that, The sample processing plate (11) is provided with a hollow drain channel (16) inside. The bottom surface of the horizontal part (1101) is provided with an exhaust port (17). The exhaust port (17) is connected to the drain channel (16). The vertical part (1102) has an air inlet (18) on the lower side of the side facing the blower head (12). The blower head (12) is flush with the air inlet (18). The air inlet (18) is connected to the drain channel (16). When the vertical part (1102) is in contact with the side wall of the upper detection cylinder (2) where the first electromagnet (14) is located, the exhaust port (17) is located in the sample processing cavity (4).

3. The PPS base fabric air permeability testing device according to claim 2, characterized in that, The blower head (12) is cylindrical and is arranged along the width direction of the upper detection cylinder (2), and is rotatably connected to the side wall of the upper detection cylinder (2). A torsion spring (19) is provided on the blower head (12), and the torsion spring (19) is used to keep the air outlet (13) horizontally facing the air inlet (18). A detection air passage (20) is opened on the side wall of the upper detection cylinder (2) where the blower head (12) is located. The detection air passage (20) is located above the air outlet (13) and is connected to the slide groove (10). A detection air outlet (21) is provided on the horizontal part (1101), and the vertical part ( When the upper detection cylinder (2) where the first electromagnet (14) is located is in contact with the side wall of the upper detection cylinder (2), the detection air outlet (21) is connected to the detection air passage (20). A second electromagnet (22) is also fixedly installed on the inner wall of one side of the detection chamber (3) where the blower head (12) is located. The second electromagnet (22) is located on the upper side of the blower head (12). A second permanent magnet (23) corresponding to the second electromagnet (22) is provided on the blower head (12). A valve plate (24) is rotatably installed in the drain channel (16) of the vertical part (1102). The valve plate (24) is only allowed to deflect upwards and closes the drain channel (16) in its natural state.

4. The PPS base fabric air permeability testing device according to claim 2, characterized in that, The vertical part (1102) has an adsorption port (25) on the side facing the first electromagnet (14). The adsorption port (25) is connected to the sewage channel (16) and the adsorption port (25) is aligned with the air inlet (18). A partition (26) is provided between the adsorption port (25) and the air inlet (18).

5. The PPS base fabric air permeability testing device according to claim 3, characterized in that, An automatic winding reel (27) is provided on the side of the vertical part (1102) facing the blower head (12). A blocking cloth (28) is wound inside the automatic winding reel (27). A third permanent magnet (29) corresponding to the second electromagnet (22) is fixedly connected to one end of the blocking cloth (28) extending out of the automatic winding reel (27). When the third permanent magnet (29) is attracted to the second electromagnet (22) and the vertical part (1102) is in contact with the side wall of the upper detection cylinder (2) where the first electromagnet (14) is located, a guide channel (30) is formed between the blocking cloth (28) and the base cloth sample (35).

6. The PPS base fabric air permeability testing device according to claim 5, characterized in that, A blocking block (31) is provided above the second electromagnet (22). The blocking block (31) faces the first electromagnet (14) and extends horizontally out of the end face of the second electromagnet (22).

7. The PPS base fabric air permeability testing device according to claim 2, characterized in that, The upper detection cylinder (2) is horizontally fixed to the outside of a collection trough (32) for collecting fiber hairs. The collection trough (32) is located below the slide chute (10) and aligned with the slide chute (10). The collection trough (32) contains liquid.

8. The PPS base fabric air permeability testing device according to claim 3, characterized in that, An airflow sensor (33) for detecting gas flow rate is provided between the valve plate (24) and the air inlet (18). A buzzer (34) is provided on the top of the upper detection cylinder (2). The buzzer (34) is electrically connected to the airflow sensor (33).

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