A device for detecting the air permeability of a textile

Abstract

The application belongs to the technical field of textile fabric air permeability detection, in particular to a textile air permeability detection device, which comprises two detection covers, textile fabric is placed between the two detection covers, a circular hole is formed at the end of each detection cover away from the textile fabric, a connecting pipe is fixedly connected to the position of the circular hole at the lower end of the lower detection cover, an air pump is installed on the connecting pipe, a wind speed sensor is installed inside the upper detection cover, a stretching assembly is arranged in the detection cover, the stretching assembly comprises a first circular ring slidingly arranged inside the detection cover, a fifth circular ring is rotatably arranged on the side of the first circular ring close to the textile fabric, the surface of the textile fabric can be rubbed by driving the fifth circular ring to rotate, various states of the textile fabric after long-term use can be simulated, the state of the textile fabric after long-term use can be simulated, air permeability test is performed again, and more comprehensive test results can be obtained.

Description

Technical Field

[0001] This invention belongs to the field of textile fabric breathability testing technology, specifically a device for testing the breathability performance of textiles. Background Technology

[0002] Textiles are products made from textile fibers through processing and weaving. They include natural fibers and synthetic fibers. Natural fibers such as cotton, wool, and linen are natural fibers, while polyester (polyester fiber), nylon, and acrylic are synthetic fibers. Synthetic fibers have the characteristics of high strength, good elasticity, wear resistance, and chemical corrosion resistance. When textiles with heat-insulating functions are processed, it is necessary to conduct air permeability tests on the textiles to test their heat-insulating effect.

[0003] A patent application with publication number CN117929239B discloses a device and method for testing the breathability of textiles. Air is blown upwards through a duct, with a textile fabric covering the upper end of the duct. A partition separates at least two testing chambers. The airflow passing through the textile fabric is detected by a wind speed sensor within the testing chamber, thus testing the breathability of the textile fabric. A radial stretching device is used to stretch or shrink the textile fabric, detecting the breathability maintenance under elastic conditions. This allows for technical improvements based on the characteristics of the textile fabric, facilitating more stable performance after use and meeting the needs of actual wear.

[0004] In the aforementioned prior art, when testing the breathability of textiles with thermal insulation function, the textiles are repeatedly stretched before the breathability test is conducted to simulate the thermal insulation effect of textiles after prolonged use and repeated stretching. However, textiles are not only subjected to repeated stretching during use, but also to friction. The prior art cannot simulate the breathability of textiles after friction, thus failing to determine the thermal insulation effect of textiles after prolonged use and friction, and cannot obtain more comprehensive test results.

[0005] Therefore, the present invention provides a device for testing the air permeability of textiles. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a textile air permeability testing device, comprising two testing covers, with a textile fabric placed between the two testing covers. The testing covers clamp the textile fabric, and each testing cover has a circular hole at its end away from the textile fabric. A connecting pipe is fixedly connected to the lower end of the testing cover corresponding to the circular hole, and an air pump is installed in the connecting pipe. A wind speed sensor is installed inside the upper testing cover, and a stretching component is provided inside the testing cover. The stretching component includes a first circular ring that slides inside the testing cover, and a fifth circular ring that rotates on the side of the first circular ring closest to the textile fabric.

[0008] Preferably, a plurality of third rectangular strips are rotatably arranged around the first ring, and the third rectangular strips are slidably arranged inside the second rectangular tube. The second rectangular tube is rotatably arranged around the inner wall of the detection cover, and a fourth rectangular strip is rotatably connected to one side of the second rectangular tube. The fourth rectangular strip is slidably arranged in the middle of the detection cover.

[0009] Preferably, a cross block is fixedly connected to the lower end of the fifth ring, and rectangular grooves are respectively opened at the four corners of the lower end of the cross block. Rectangular slide bars are slidably connected in the rectangular grooves. The rectangular slide bars are fixedly connected to one side of the rectangular groove by springs. Several protrusions are fixedly connected to the cross block and the rectangular slide bars on one side of the textile fabric.

[0010] Preferably, the fourth rectangular strip is fixedly connected to a second ring at the end away from the textile fabric, the second ring is fixedly connected to a third ring through a first rectangular block in the middle, the cross block is fixedly connected to a first cylindrical rod on the side away from the textile fabric, the first ring is fixedly connected to a fourth ring through a second rectangular block in the middle, the first cylindrical rod slides through the middle of the detection cover, and the first cylindrical rod is rotatably positioned in the middle of the fourth ring and the third ring.

[0011] Preferably, a rectangular plate is fixed to the outer side of the middle part of the detection cover, and a flattening component is provided on the opposite side of the rectangular plate. The flattening component includes a telescopic rod rotatably disposed on the outer side of the detection cover, and a rotating wheel is provided at the end of the telescopic rod near the textile fabric through damping rotation.

[0012] Preferably, the rectangular plate at the lower end is fixed to a base plate by a support column, and slide rails are fixed to both sides of the upper end of the base plate. A slider is slidably arranged on one side of each slide rail, and the rectangular plate at the upper end is fixed to the slider on both sides.

[0013] Preferably, a second cylindrical rod is fixedly connected to one side of the upper end of the base plate, and one side of the rectangular plate is slidably disposed outside the second cylindrical rod via a second rectangular strip. A fifth rectangular strip is fixedly connected to one side of the second ring, and the fifth rectangular strip is slidably disposed outside the second cylindrical rod. A connecting block is fixedly connected to the middle of the second cylindrical rod, and a first cylinder is rotatably connected to the middle of the connecting block. Irregularly shaped cylinders are slidably disposed inside both ends of the first cylinder. A third rectangular block is fixedly connected to one side of the fifth rectangular strip, and a lead screw is rotatably disposed on the opposite side of the third rectangular block. The lead screw is threadedly connected to the inside of the irregularly shaped cylinder. A second cylinder is fixedly connected to the outside of the irregularly shaped cylinder, and the second cylinder is rotatably disposed in the middle of the second rectangular strip.

[0014] Preferably, a third cylinder is rotatably disposed in the middle of the connecting block, and irregular cylindrical strips are slidably disposed inside both ends of the third cylinder. A fourth cylinder is fixedly connected to the outer side of each irregular cylindrical strip. The fourth cylinder is rotatably disposed in the middle of the second rectangular strip. The ends of the irregular cylindrical strips are connected to the first cylindrical rod through a transmission assembly.

[0015] Preferably, the transmission assembly includes a second sprocket fixed to the end of an irregular cylindrical bar, a first sprocket fixed to the end of the first cylindrical bar, and the second sprocket and the first sprocket are driven by a chain.

[0016] Preferably, sealing strips are installed on opposite edges of the detection cover, and a sixth ring is fixedly connected to the outer side of opposite sides of the detection cover. Several pointed blocks are fixedly connected to the lower side of the upper sixth ring, and grooves are respectively opened at the upper end of the lower sixth ring corresponding to the position of the pointed blocks, and the pointed blocks can be inserted into the grooves.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The textile breathability testing device of the present invention uses a first ring to drive a centrally placed textile fabric through a fifth ring, repeatedly stretching it. Simultaneously, the fifth ring rotates on one side of the first ring, causing friction on the surface of the textile fabric. Then, an air pump is restarted to test the breathability of the stretched and rubbed textile fabric. This simulates the state of textiles after prolonged use and repeated stretching and friction, allowing for a more comprehensive assessment of the fabric's warmth retention after extended use and friction testing.

[0019] 2. The textile air permeability testing device of the present invention drives the fifth ring to rotate, which in turn drives the cross block to rotate. The centripetal force generated when the cross block rotates drives the rectangular slide bar to slide outward in the rectangular groove. The cross block and the rectangular slide bar drive several protrusions to rub against the surface of the textile fabric, resulting in a larger friction area on the textile fabric. The degree of friction on the textile fabric can be controlled by controlling the rotation speed of the fifth ring. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0022] Figure 2 This is a diagram showing the location of the textile fabric;

[0023] Figure 3 This is a schematic diagram of a cross-section of a rectangular plate;

[0024] Figure 4 This is a schematic diagram of the cross-section of the testing cover;

[0025] Figure 5 This is a schematic diagram of a rectangular slider structure;

[0026] Figure 6 This is a schematic diagram showing the position of the second cylindrical rod;

[0027] Figure 7 This is a schematic diagram of the transmission assembly structure;

[0028] Figure 8 This is a schematic diagram of the cross-section of the second rectangular strip;

[0029] Figure 9 This is a schematic diagram of the cross-section of the sixth ring;

[0030] In the diagram: 1. Detection cover; 11. Rectangular plate; 111. Telescopic rod; 112. Rotating wheel; 114. Second rectangular bar; 12. First ring; 121. Third rectangular bar; 122. Second rectangular cylinder; 123. Fourth rectangular bar; 124. Second ring; 1241. First rectangular block; 1242. Third ring; 125. Second rectangular block; 1251. Fourth ring; 126. Fifth rectangular bar; 127. Third rectangular block; 13. Fifth ring; 131. Cross block; 1311. Rectangular groove; 1312. Rectangular slider; 1313. Spring; 1314. 1. Protrusion; 132. First cylindrical rod; 133. First sprocket; 134. Chain; 14. Sealing strip; 15. Sixth ring; 151. Pointed block; 152. Groove; 16. Round hole; 161. Connecting pipe; 162. Air pump; 17. Support column; 18. Slide rail; 181. Slider; 2. Textile fabric; 3. Second cylindrical rod; 31. Connecting block; 32. First cylinder; 321. Irregular cylinder; 322. Lead screw; 323. Second cylinder; 33. Third cylinder; 331. Irregular cylindrical strip; 332. Fourth cylinder; 333. Second sprocket; 4. Base plate. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] Example 1: As Figures 1-5 As shown in the embodiment of the present invention, a textile air permeability testing device includes two testing covers 1, with a textile fabric 2 placed between the two testing covers 1. The testing covers 1 clamp the textile fabric 2. The ends of the testing covers 1 away from the textile fabric 2 are respectively provided with circular holes 16. The lower end of the testing cover 1 is fixedly connected to the circular holes 16 at the lower end of the testing cover 1. An air pump 162 is installed on the connecting pipe 161. A wind speed sensor is installed inside the testing cover 1 at the upper end. A tensioning component is provided inside the testing cover 1. The tensioning component includes a first ring 12 that is slidably disposed inside the testing cover 1. A fifth ring 13 is rotatably disposed on the side of the first ring 12 near the textile fabric 2.

[0033] Specifically, when testing the breathability of textiles with thermal insulation functions, existing technologies cannot simulate the breathability of textiles after friction, thus failing to determine the thermal insulation effect of textiles after prolonged use and friction. The results of these thermal insulation tests are relatively limited. In this testing device, the textile fabric 2 is placed between two testing covers 1, and then the two covers 1 are driven closer together until the textile fabric 2 is clamped. Simultaneously, the fifth ring 13 is pressed tightly against the upper and lower ends of the textile fabric 2. Then, the air pump 162 is activated to blow air into the lower testing cover 1. The wind speed sensor installed inside the upper testing cover 1 detects the speed of the airflow through the textile fabric 2, and the difference is calculated. To test the breathability and stability of textile fabric 2, the first ring 12 is driven to move in the same direction inside the test cover 1. The first ring 12, through the fifth ring 13, repeatedly stretches the textile fabric 2 placed in the middle. At the same time, the fifth ring 13 is driven to rotate on one side of the first ring 12, causing friction on the surface of the textile fabric 2. Then, the air pump 162 is restarted to test the breathability of the textile fabric 2 after stretching and friction. This can simulate the state of textiles after long-term use and repeated stretching and friction. After the breathability test, the thermal insulation effect of the textile after long-term use and stretching and friction can be determined, and more comprehensive test results can be obtained.

[0034] like Figure 4 As shown, several third rectangular bars 121 are rotatably arranged around the first ring 12. The third rectangular bars 121 are slidably arranged inside the second rectangular tube 122. The second rectangular tube 122 is rotatably arranged around the inner wall of the detection cover 1. A fourth rectangular bar 123 is rotatably connected to one side of the second rectangular tube 122. The fourth rectangular bars 123 are slidably arranged in the middle of the detection cover 1.

[0035] Specifically, when performing a tensile friction test on the textile fabric 2 held in the middle of the test cover 1, the fourth rectangular bar 123 is driven to slide in the middle of the test cover 1. The fourth rectangular bar 123 drives the third rectangular bar 121 to rotate through the second rectangular tube 122. The third rectangular bar 121 drives the fifth ring 13 to move up and down inside the test cover 1 through the first ring 12. This can stretch the textile fabric 2. By driving the fifth ring 13 to rotate, friction can be applied to the surface of the textile fabric 2, which can simulate various states of the textile fabric 2 after long-term use.

[0036] like Figure 5As shown, a cross block 131 is fixedly connected to the lower end of the fifth ring 13. Rectangular grooves 1311 are respectively opened at the four corners of the lower end of the cross block 131. Rectangular slide bars 1312 are slidably connected in the rectangular grooves 1311. The rectangular slide bars 1312 are fixedly connected to one side of the rectangular grooves 1311 through springs 1313. Several protrusions 1314 are fixedly connected to the cross block 131 and the rectangular slide bars 1312 on one side of the textile fabric 2.

[0037] Specifically, when friction detection is performed on the textile fabric 2, the fifth ring 13 is driven to rotate, which in turn drives the cross block 131 to rotate. The centripetal force generated by the rotation of the cross block 131 drives the rectangular slide bar 1312 to slide outward in the rectangular groove 1311. The cross block 131 and the rectangular slide bar 1312 drive several protrusions 1314 to rub against the surface of the textile fabric 2, resulting in a larger friction area on the textile fabric 2. The degree of friction on the textile fabric 2 can be controlled by controlling the rotation speed of the fifth ring 13.

[0038] like Figures 4-5 As shown, the fourth rectangular strip 123 is fixedly connected to the second ring 124 at the end away from the textile fabric 2. The third ring 1242 is fixedly connected to the middle of the second ring 124 through the first rectangular block 1241. The first cylindrical rod 132 is fixedly connected to the side of the cross block 131 away from the textile fabric 2. The fourth ring 1251 is fixedly connected to the middle of the first ring 12 through the second rectangular block 125. The first cylindrical rod 132 slides through the middle of the detection cover 1. The first cylindrical rod 132 is rotatably set in the middle of the fourth ring 1251 and the third ring 1242.

[0039] Specifically, by driving the two second rings 124 to move in the same direction, the second rings 124 drive the first ring 12 to stretch the textile fabric 2 through the fourth rectangular bar 123, and at the same time drive the first cylindrical rod 132 to slide up and down in the middle of the detection cover 1. Then, drive the first cylindrical rod 132 to rotate in the middle of the third ring 1242 and the fourth ring 1251. The first cylindrical rod 132 drives the cross block 131 and the rectangular slider 1312 to rotate through the fifth ring 13, causing friction on the surface of the textile fabric 2.

[0040] like Figure 3 As shown, a rectangular plate 11 is fixed to the outer side of the middle part of the detection cover 1. A flattening assembly is provided on the opposite side of the rectangular plate 11. The flattening assembly includes a telescopic rod 111 that is rotatably arranged on the outer side of the detection cover 1. A rotating wheel 112 is provided at the end of the telescopic rod 111 near the textile fabric 2 through damping rotation.

[0041] Specifically, when the two detection covers 1 are driven to approach each other, the two rectangular plates 11 are driven to approach each other. The rectangular plates 11 drive the rotating wheels 112 to approach each other through the telescopic rod 111 until the upper and lower rotating wheels 112 clamp the edge of the textile fabric 2. At this time, the detection cover 1 has not yet clamped the textile fabric 2. Then, the two detection covers 1 are driven to approach each other. The rotating wheels 112 drive the edge of the textile fabric 2 to pull outward. At the same time, the telescopic rod 111 retracts, which can flatten the textile fabric 2. Then, the air permeability test is carried out to make the test results more accurate.

[0042] like Figure 1 As shown, the rectangular plate 11 at the lower end is fixed to the base plate 4 by the support column 17. The upper ends of the base plate 4 are fixed to the two sides of the slide rail 18 respectively. The slide rail 18 is slidably arranged on one side of the slide rail 18. The upper ends of the rectangular plate 11 are fixed to the two sides of the slide rail 181 respectively.

[0043] Specifically, by driving the slider 181 to slide on one side of the slide rail 18, the slider 181 drives the upper rectangular plate 11 to slide downward, and the rectangular plate 11 drives the detection cover 1 to slide downward to clamp the textile fabric 2 in the middle, and then perform detection.

[0044] like Figures 6-8 As shown, a second cylindrical rod 3 is fixedly connected to one side of the upper end of the base plate 4. A rectangular plate 11 is slidably disposed on the outside of the second cylindrical rod 3 via a second rectangular strip 114. A fifth rectangular strip 126 is fixedly connected to one side of the second ring 124. The fifth rectangular strip 126 is slidably disposed on the outside of the second cylindrical rod 3. A connecting block 31 is fixedly connected to the middle of the second cylindrical rod 3. A first cylinder 32 is rotatably connected to the middle of the connecting block 31. Irregular cylinders 321 are slidably disposed inside both ends of the first cylinder 32. A third rectangular block 127 is fixedly connected to one side of the fifth rectangular strip 126. A lead screw 322 is rotatably disposed on the opposite side of the third rectangular block 127. The lead screw 322 is threadedly connected to the inside of the irregular cylinder 321. A second cylinder 323 is fixedly connected to the outside of the irregular cylinder 321. The second cylinder 323 is rotatably disposed in the middle of the second rectangular strip 114.

[0045] Specifically, when the driving rectangular plates 11 approach each other, the second rectangular bar 114 slides outside the second cylindrical rod 3. The second rectangular bar 114 drives the irregular cylinder 321 to slide inside the first cylinder 32 via the second cylinder 323. The irregular cylinder 321 drives the third rectangular block 127 to move via the lead screw 322. The third rectangular block 127 drives the second ring 124 to move via the fifth rectangular bar 126, so that the second ring 124 moves synchronously with the rectangular plates 11. By driving the first cylinder 32 to rotate, the irregular cylinders 321 at both ends rotate synchronously. The irregular cylinder 321 drives the lead screws 322 at both ends to rotate in the same direction, so that the lead screws 322 drive the third rectangular block 127 to move in the same direction. The third rectangular block 127 drives the second ring 124 to move in the same direction via the fifth rectangular bar 126. The second ring 124 drives the two first rings 12 to move in the same direction, so that the two first rings 12 move synchronously, stretching the textile fabric 2.

[0046] like Figure 8 As shown, a third cylinder 33 is rotatably disposed in the middle of the connecting block 31. Irregular cylindrical strips 331 are slidably disposed inside both ends of the third cylinder 33. A fourth cylinder 332 is fixedly connected to the outside of the irregular cylindrical strips 331. The fourth cylinders 332 are rotatably disposed in the middle of the second rectangular strip 114. The ends of the irregular cylindrical strips 331 are connected to the first cylindrical rod 132 through a transmission assembly.

[0047] Specifically, by driving the third cylinder 33 to rotate, the irregular cylindrical strips 331 at both ends rotate synchronously. The ends of the two irregular cylindrical strips 331 drive the first cylindrical rod 132 to rotate simultaneously through the transmission assembly. The first cylindrical rod 132 drives the rectangular slide bar 1312 to rotate through the cross block 131, causing friction on both sides of the textile fabric 2.

[0048] like Figure 8 As shown, the transmission assembly includes a second sprocket 333 fixed to the end of an irregular cylindrical bar 331, a first sprocket 133 fixed to the end of a first cylindrical rod 132, and the second sprocket 333 and the first sprocket 133 are driven by a chain 134.

[0049] Specifically, by driving the third cylinder 33 to rotate, the irregular cylindrical strips 331 at both ends are driven to rotate. The irregular cylindrical strips 331 drive the second sprocket 333 to rotate. The second sprocket 333 drives the first sprocket 133 to rotate through the chain 134. The first sprocket 133 drives the first cylindrical rod 132 to rotate.

[0050] Example 2: Figure 9As shown in the comparative embodiment one, another embodiment of the present invention is as follows: sealing strips 14 are respectively installed on opposite edges of the detection cover 1, and a sixth ring 15 is respectively fixed to the outer side of opposite sides of the detection cover 1. Several pointed blocks 151 are fixed to the lower side of the sixth ring 15 at the upper end, and grooves 152 are respectively opened at the upper end of the sixth ring 15 at the lower end corresponding to the position of the pointed blocks 151, and the pointed blocks 151 can be inserted into the grooves 152.

[0051] Specifically, when the two test covers 1 are driven to approach each other, a sealing strip 14 is provided on the side of the test cover 1 that contacts the textile fabric 2 to prevent air leakage during the air permeability test. When the test covers 1 approach each other, the two sixth rings 15 are driven to approach each other at the same time. The upper sixth ring 15 drives several pointed blocks 151 to drive the edge of the textile fabric 2 to be inserted into the groove 152 to fix the textile fabric 2 and prevent the textile fabric 2 from falling off during the test.

[0052] Working principle: In use, the textile fabric 2 is placed between two detection covers 1. The slider 181 slides on one side of the slide rail 18. The slider 181 drives the upper rectangular plate 11 to slide downward. The rectangular plate 11 drives the two detection covers 1 to move closer to each other. At the same time, the fifth ring 13 is pressed tightly against the upper and lower ends of the textile fabric 2. Meanwhile, the rectangular plate 11 drives the rotating wheel 112 to move closer to each other through the telescopic rod 111 until the upper and lower rotating wheels 112 clamp the edge of the textile fabric 2. At this time, the detection cover 1 has not yet clamped the textile fabric 2. Then, the two detection covers 1 are continuously driven to move closer to each other. The rotating wheel 112 drives the edge of the textile fabric 2 to pull outward. At the same time, the telescopic rod 111 retracts, which can flatten the textile fabric 2. The detection cover 1 has a sealing strip 14 on the side that contacts the textile fabric 2 to prevent air leakage during the air permeability test. When the detection covers 1 move closer to each other, the two sixth rings 15 move closer to each other. The upper sixth ring 15 drives several pointed blocks 151 to insert the edge of the textile fabric 2 into the groove 152 to fix the textile fabric 2.

[0053] When the driving rectangular plates 11 approach each other, the second rectangular bar 114 slides outside the second cylindrical rod 3. The second rectangular bar 114 drives the irregular cylinder 321 to slide inside the first cylinder 32 through the second cylinder 323. The irregular cylinder 321 drives the third rectangular block 127 to move through the lead screw 322. The third rectangular block 127 drives the second ring 124 to move through the fifth rectangular bar 126, so that the second ring 124 moves synchronously with the rectangular plates 11. By driving the first cylinder 32 to rotate, the irregular cylinders 321 at both ends rotate synchronously. The irregular cylinder 321 drives the lead screws 322 at both ends to rotate in the same direction, so that the lead screws 322 drive the third rectangular block 127 to move in the same direction. The third rectangular block 127 drives the second ring 124 to move in the same direction through the fifth rectangular bar 126. The second ring 124 drives the two first rings 12 to move in the same direction, so that the two first rings 12 can move synchronously and stretch the textile fabric 2.

[0054] The rotation of the third cylinder 33 drives the rotation of the irregular cylindrical strips 331 at both ends. The irregular cylindrical strips 331 drive the second sprocket 333 to rotate. The second sprocket 333 drives the first sprocket 133 to rotate via the chain 134. The first sprocket 133 drives the first cylindrical rod 132 to rotate. The first cylindrical rod 132 drives the rectangular slide bar 1312 to rotate via the cross block 131, causing friction on both sides of the textile fabric 2.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A kind of textile air permeability detection device, including two detection covers (1), textile fabric (2) is placed between two the detection cover (1), the detection cover (1) is clamped to textile fabric (2), the detection cover (1) is respectively provided with round hole (16) away from textile fabric (2) one end, the position of the round hole (16) corresponding the lower end of the detection cover (1) is respectively fixedly connected with connecting pipe (161), the connecting pipe (161) is installed with air pump (162), wind speed sensor is installed in the detection cover (1) inside located upper end, the detection cover (1) is provided with tensioning assembly, it is characterized by: The stretching assembly comprises a first circular ring (12) slidingly arranged inside a detection cover (1), and the first circular ring (12) is rotationally provided with a fifth circular ring (13) near one side of a textile fabric (2); The first circular ring (12) is rotationally provided with a plurality of third rectangular strips (121) around the first circular ring (12), the third rectangular strips (121) are slidingly arranged inside second rectangular cylinders (122), the second rectangular cylinders (122) are rotationally arranged around inner walls of the detection cover (1), fourth rectangular strips (123) are rotationally connected to one side of the second rectangular cylinders (122), and the fourth rectangular strips (123) are slidingly arranged in the middle of the detection cover (1). The fifth circular ring (13) is fixedly connected with a cross block (131) at the lower end of the fifth circular ring (13), rectangular grooves (1311) are formed in the lower end of the cross block (131), rectangular sliding strips (1312) are slidingly connected in the rectangular grooves (1311), the rectangular sliding strips (1312) are fixedly connected to one side inside the rectangular grooves (1311) through springs (1313), and a plurality of convex blocks (1314) are fixedly connected to one side of the cross block (131) and the rectangular sliding strips (1312) located on one side of the textile fabric (2). The fourth rectangular strips (123) are fixedly connected with second circular rings (124) at the ends away from the textile fabric (2), the second circular rings (124) are fixedly connected with third circular rings (1242) through first rectangular blocks (1241) in the middle of the second circular rings (124), a first cylindrical rod (132) is fixedly connected to one side of the cross block (131) away from the textile fabric (2), fourth circular rings (1251) are fixedly connected to the middle of the first circular ring (12) through second rectangular blocks (125), the first cylindrical rod (132) slidingly penetrates the middle of the detection cover (1), and the first cylindrical rod (132) is rotationally arranged in the middle of the fourth circular ring (1251) and the third circular ring (1242).

2. The device for detecting the air permeability of a textile according to claim 1, characterized in that: The middle of the detection cover (1) is fixedly connected with a rectangular plate (11), opposite sides of the rectangular plate (11) are respectively provided with flattening assemblies, the flattening assemblies comprise telescopic rods (111) rotationally arranged outside the detection cover (1), and the telescopic rods (111) are rotationally provided with rotating wheels (112) at the ends close to the textile fabric (2) through damping.

3. The device for detecting the air permeability of a textile according to claim 2, characterized in that: The rectangular plate (11) at the lower end is fixedly connected with a bottom plate (4) through a support column (17), both sides of the upper end of the bottom plate (4) are fixedly connected with sliding rails (18), and the sliding rails (18) are slidingly provided with sliding blocks (181) at one side. Both sides of the rectangular plate (11) at the upper end are fixedly connected with the sliding blocks (181).

4. The device for detecting the air permeability of a textile according to claim 3, characterized in that: The second cylindrical rod (3) is fixed to one side of the upper end of the bottom plate (4), the rectangular plate (11) is slidably arranged on the outer side of the second cylindrical rod (3) through the second rectangular strip (114), the fifth rectangular strip (126) is fixed to one side of the second circular ring (124), the fifth rectangular strip (126) is slidably arranged on the outer side of the second cylindrical rod (3), the connecting block (31) is fixed to the middle of the second cylindrical rod (3), the first cylinder (32) is rotatably connected to the middle of the connecting block (31), the special-shaped cylinder (321) is slidably arranged in the first cylinder (32), the third rectangular block (127) is fixed to one side of the fifth rectangular strip (126), the screw rod (322) is rotatably arranged on the opposite side of the third rectangular block (127), the screw rod (322) is screw-connected with the special-shaped cylinder (321), the second cylinder (323) is fixed to the outer side of the special-shaped cylinder (321), and the second cylinder (323) is rotatably arranged in the middle of the second rectangular strip (114).

5. The device for detecting the air permeability of a textile according to claim 4, characterized in that: The third cylinder (33) is rotatably arranged in the middle of the connecting block (31), the special-shaped cylindrical strip (331) is slidably arranged in the third cylinder (33), the fourth cylinder (332) is fixed to the outer side of the special-shaped cylindrical strip (331), and the fourth cylinder (332) is rotatably arranged in the middle of the second rectangular strip (114). The end of the special-shaped cylindrical strip (331) is connected with the first cylindrical rod (132) through the transmission assembly.

6. The device for detecting the air permeability of a textile according to claim 5, characterized in that: The transmission assembly comprises the second sprocket (333) fixed to the end of the special-shaped cylindrical strip (331), the first sprocket (133) is fixed to the end of the first cylindrical rod (132), and the second sprocket (333) and the first sprocket (133) are driven through the chain (134).

7. The device for detecting the air permeability of a textile according to claim 1, characterized in that: The sealing strip (14) is mounted on the opposite side edge of the detection cover (1), the sixth circular ring (15) is fixed to the outer side of the opposite side of the detection cover (1), the sharp block (151) is fixed to the lower side of the sixth circular ring (15) located at the upper end, the recess (152) is formed in the position corresponding to the sharp block (151) of the upper end of the sixth circular ring (15) located at the lower end, and the sharp block (151) can be inserted into the recess (152).

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