A fabric air permeability testing device

Abstract

The present invention relates to the technical field of fabric detection, and in particular to a fabric air permeability testing device. It comprises a support frame, a fixed handle is arranged on the support frame, a fan and a fixed pipe are also arranged on the support frame, and the air outlet of the fan is connected with the side of the fixed pipe through a connecting pipe. The present invention cooperates with the fan, the fixed pipe, the porous sponge block, the distance sensor, the controller, the storage tube, the rubber ring, the guide mechanism and the lifting mechanism, and can use the rubber ring to press the fabric to the bottom end of the fixed pipe, and then introduce the air into the fixed pipe through the fan, so that the air is discharged from the upper and lower ends of the fixed pipe, and then according to the distance between the distance sensor and the porous sponge block, the amount of gas discharged from the upper end of the fixed pipe can be judged, so as to evaluate the air permeability of the fabric at the lower end of the fixed pipe, and then the fabric is tested for air permeability, and the test in this way can make the test results more accurately reflect the performance of the fabric in the actual wearing process.

Description

Technical Field

[0001] The present invention relates to the technical field of cloth detection, and in particular to a cloth air permeability testing device. Background Art

[0002] The breathability of fabrics is an important indicator in the quality evaluation of textiles, especially for sportswear, outdoor equipment and daily wear. Good breathability can not only improve wearing comfort, but also help regulate body temperature and reduce sweat accumulation, thereby improving the user experience; therefore, the development of efficient and accurate breathability testing equipment has become an important issue in the textile industry.

[0003] At present, most fabric air permeability testing equipment adopts the pressurized test method. This test method measures the air flow through the fabric per unit time by applying a certain air pressure difference on both sides of the fabric, thereby evaluating its air permeability; however, the pressurized test is carried out under an artificially created pressure difference, which is very different from the natural state when actually worn. In the natural state, the interaction between airflow, fabric and skin is more complicated, and the air permeability performance will also be different. By applying an air pressure difference, the air can only flow in one direction, so the air must pass through the fabric. In reality, most of the air is free, so the air will not be constrained to pass through the fabric. The air permeability generated by the air passing through the fabric in this natural state is the actual air permeability when worn. For example, due to the different fibers used in the fabric, some fabrics have large meshes, but due to the large number of fibers, the mesh will cause wind resistance. At this time, the airflow will be subject to great resistance, while in the closed pressurized air permeability test, the airflow can easily pass through the fiber barrier, so it is not matched with the reality, resulting in the test results being difficult to fully reflect the performance of the material in the actual wearing process. Summary of the invention

[0004] In view of this, the present invention provides a fabric air permeability testing device, which can solve the problem that the existing fabric air permeability test usually adopts a pressurized test method, which allows air to flow in only one direction, resulting in a large difference between the test result and the natural state during actual wear, and it is difficult to fully reflect the performance of the material during actual wear.

[0005] The technical implementation scheme of the present invention is: a kind of fabric air permeability testing equipment, including a support frame, a fixed handle is arranged on the support frame, a fan and a fixed pipe are also arranged on the support frame, the air outlet of the fan is connected with the side of the fixed pipe through a connecting pipe, the connecting pipe and the fixed pipe form a T-shaped structure, a guide mechanism is arranged on the inner side of the fixed pipe, a porous sponge block is arranged on the guide mechanism, the guide mechanism is used to guide the porous sponge block when it moves inside the fixed pipe, a distance sensor is also arranged on the guide mechanism, the distance sensor is used to sense the distance between the porous sponge block, a controller is installed on the side wall of the fixed pipe, the controller is electrically connected to the distance sensor, a lifting mechanism is arranged on the support frame, the lifting mechanism is connected with a placing tube, the placing tube is located directly below the fixed tube, a rubber ring is installed on the top of the placing tube, the rubber ring on the top of the placing tube is used to place fabric, and the lifting mechanism is used to drive the placing tube to lift and lower, so as to press the fabric on the rubber ring to the bottom end of the fixed tube for air permeability testing.

[0006] Optionally, the guide mechanism includes a guide rod frame and a slider. The guide rod frame is installed inside the fixed tube, the guide rod frame is connected to the distance sensor, and a slider is slidably arranged on the guide rod frame, and the slider is connected to the porous sponge block.

[0007] Optionally, the lifting mechanism includes an electric push rod and a sliding frame, the electric push rod is installed on the support frame, the sliding frame is slidably arranged on the support frame, the sliding frame is connected to the telescopic rod of the electric push rod, and the storage tube is connected to the sliding frame.

[0008] Optionally, a flattening mechanism is also included, which includes a sleeve and a sponge ring. The sleeve is connected to one end of the fixed tube close to the placement tube, and a sponge ring is arranged on the inside of the sleeve. The sponge ring is used to increase the resistance of the fabric outside the rubber ring so as to flatten the fabric inside the rubber ring.

[0009] Optionally, a fixing mechanism is also included, which includes a movable frame, a first magnetic ring and a second magnetic ring. The movable frame is slidably arranged on the support frame, the movable frame is connected to the first magnetic ring, and the second magnetic ring is arranged on the sliding frame. The second magnetic ring is located directly below the first magnetic ring. The first magnetic ring is used to press the fabric outside the rubber ring onto the second magnetic ring for fixing.

[0010] Optionally, a third magnetic ring is further included. The outer wall of the sleeve is provided with the third magnetic ring, the third magnetic ring is located directly above the first magnetic ring, and the third magnetic ring is used to adsorb the first magnetic ring for limiting position.

[0011] Optionally, a separation mechanism is also included, which includes a fixed shaft, a rotating handle and an elastic rope. A fixed shaft is provided on the first magnetic ring, and the rotating handle is rotatably installed on the fixed shaft. The rotating handle is used to separate the second magnetic ring and the third magnetic ring from the first magnetic ring, and an elastic rope is connected between the rotating handle and the first magnetic ring.

[0012] Optionally, a fiber filter is also included. The air inlet of the fan is installed with a fiber filter, and the fiber filter is used to prevent dust from entering the fan.

[0013] Compared with the prior art, the present invention has the following advantages: 1. The present invention cooperates with a blower, a fixed tube, a porous sponge block, a distance sensor, a controller, a storage tube, a rubber ring, a guide mechanism and a lifting mechanism, and can use the rubber ring to press the cloth against the bottom end of the fixed tube, and then introduce air into the fixed tube through the blower, so that the air is discharged from the upper and lower ends of the fixed tube, and then the amount of gas discharged from the upper end of the fixed tube can be judged according to the distance between the distance sensor and the porous sponge block, so as to evaluate the air permeability of the cloth at the lower end of the fixed tube, and then perform an air permeability test on the cloth, and the use of this testing method can make the test results more accurately reflect the performance of the cloth in the actual wearing process.

[0014] 2. The present invention provides a flattening mechanism, which enables the sponge ring to increase the friction resistance of the cloth outside the rubber ring, so that the cloth inside the rubber ring will be pulled by the cloth outside the rubber ring, thereby flattening the cloth inside the rubber ring, and then flattening the cloth inside the rubber ring to prevent the cloth inside the rubber ring from affecting the test due to wrinkles.

[0015] 3. The present invention can filter the air entering the fan by arranging a fiber filter, thereby blocking the dust in the air to prevent the fan from introducing the dust in the air into the fixed pipe to affect the air permeability test of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the fan, the fixing pipe and the connecting pipe of the present invention.

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the porous sponge block, distance sensor and controller of the present invention.

[0019] Figure 4 This is a structural separation diagram of the guide mechanism and the porous sponge block of the present invention.

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the lifting mechanism, the storage tube and the rubber ring of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the cloth of the present invention placed on the rubber ring on the top of the storage tube.

[0022] Figure 7 A cross-sectional view of the paving mechanism of the present invention.

[0023] Figure 8It is a schematic diagram of the three-dimensional structure of the fixing mechanism, the third magnetic ring and the fiber filter screen of the present invention.

[0024] Fig. 9 It is a three-dimensional structural schematic diagram of the fixed shaft, the rotating handle and the elastic rope of the present invention.

[0025] Fig.10 It is a schematic diagram of the three-dimensional structure of the separation mechanism of the present invention.

[0026] The markings of the components in the accompanying drawings are as follows: 1. Support frame, 101. Fabric, 2. Fixed handle, 3. Fan, 4. Fixed pipe, 5. Connecting pipe, 601. Guide rod frame, 602. Slider, 7. Porous sponge block, 8. Distance sensor, 9. Controller, 1001. Electric push rod, 1002. Sliding frame, 11. Storage tube, 12. Rubber ring, 13. Sleeve, 14. Sponge ring, 15. Movable frame, 16. First magnetic ring, 17. Second magnetic ring, 18. Third magnetic ring, 19. Fixed shaft, 20. Rotating handle, 21. Elastic rope, 22. Fiber filter. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment: A fabric air permeability testing device, see Figure 1-Figure 6As shown, it includes a support frame 1; it also includes a fixed handle 2, a fan 3, a fixed tube 4, a connecting tube 5, a porous sponge block 7, a distance sensor 8, a controller 9, a storage tube 11, a rubber ring 12, a guide mechanism and a lifting mechanism; a fixed handle 2 is arranged on the upper right side of the support frame 1; a fan 3 is installed in the middle of the right side of the support frame 1; a fixed tube 4 is installed on the upper left side of the support frame 1; the air outlet of the fan 3 is connected with the side of the fixed tube 4 through the connecting tube 5, and the connecting tube 5 and the fixed tube 4 form a T-shaped structure. When the fan 3 discharges air into the fixed tube 4 through the connecting tube 5, the air in the fixed tube 4 will be discharged from the upper and lower ends; a guiding mechanism is arranged on the inner side of the fixed tube 4, and a porous sponge block 7 is arranged on the guiding mechanism. There is a certain gap between the porous sponge block 7 and the inner wall of the fixed tube 4, and the guiding mechanism is used to guide the porous sponge block 7 when it moves inside the fixed tube 4. When the air in the fixed tube 4 needs to be discharged from the upper end, the air in the fixed tube 4 It needs to pass through the porous sponge block 7 for discharge, and the upwardly flowing air will also squeeze the porous sponge block 7 in the fixed tube 4 to move upward; a distance sensor 8 is also provided on the guide mechanism, and the distance sensor 8 is used to sense the distance between the porous sponge block 7; a controller 9 is installed on the upper right side of the fixed tube 4, and the controller 9 is electrically connected to the distance sensor 8; a lifting mechanism is provided on the support frame 1, and a storage tube 11 is connected to the lifting mechanism, and the storage tube 11 is located directly below the fixed tube 4, and the inner and outer diameters of the storage tube 11 and the fixed tube 4 are consistent; a rubber ring 12 is installed on the top of the storage tube 11, and the rubber ring 12 on the top of the storage tube 11 is used to place cloth 101, and the lifting mechanism is used to drive the storage tube 11 to lift and lower, so as to press the cloth 101 on the rubber ring 12 to the bottom end of the fixed tube 4 for air permeability testing. When the air in the fixed tube 4 needs to be discharged from the lower end, the air in the fixed tube 4 needs to pass through the cloth 101 for discharge.

[0029] See also Figure 3 and Figure 4 As shown, the guide mechanism includes a guide rod frame 601 and a slider 602; the guide rod frame 601 is installed on the inner side of the fixed tube 4, the upper side of the guide rod frame 601 is connected to the distance sensor 8, and the guide rod frame 601 is located above the connecting tube 5; a slider 602 is slidably arranged on the guide rod frame 601, and the slider 602 is connected to the porous sponge block 7.

[0030] See also Figure 5 and Figure 6 As shown, the lifting mechanism includes an electric push rod 1001 and a sliding frame 1002; the electric push rod 1001 is installed on the lower right side of the support frame 1; the sliding frame 1002 is slidably arranged on the support frame 1, the sliding frame 1002 is connected to the telescopic rod of the electric push rod 1001, and the storage tube 11 is connected to the sliding frame 1002.

[0031] When in use, the operator holds the fixed handle 2 to place the support frame 1 at a designated position, and then places the cloth 101 on the rubber ring 12 at the top of the placement tube 11 (such as Figure 6 As shown, the electric push rod 1001 drives the sliding frame 1002, the storage tube 11 and the rubber ring 12 to move upward, so that the rubber ring 12 drives the cloth 101 to move upward. When the cloth 101 on the rubber ring 12 contacts the bottom end of the fixed tube 4, the bottom end of the fixed tube 4 will block the cloth 101 and the rubber ring 12 from moving upward. When the storage tube 11 continues to move upward, the storage tube 11 will squeeze the rubber ring 12 to deform, so that the rubber ring 12 applies pressure to the cloth 101 through deformation, so that the rubber ring 12 presses the cloth 101 tightly against the bottom end of the fixed tube 4, and then starts The fan 3 introduces air into the fixed tube 4 through the connecting tube 5, so that the air in the fixed tube 4 is discharged from the upper and lower ends. If the air in the fixed tube 4 is discharged from the lower end, the air in the fixed tube 4 needs to pass through the fabric 101 and then be discharged through the storage tube 11. If the air in the fixed tube 4 needs to be discharged from the upper end, the air in the fixed tube 4 needs to pass through the porous sponge block 7 to be discharged, and the air flowing upward will also squeeze the porous sponge block 7 in the fixed tube 4 to move upward. Then, the air permeability of the fabric 101 can be evaluated according to the air discharged from the upper and lower ends of the fixed tube 4:

[0032] If the gas discharged from the upper end of the fixed tube 4 is small, the gas discharged from the lower end of the fixed tube 4 is large, indicating that the air permeability of the cloth 101 is strong; if the gas discharged from the upper end of the fixed tube 4 is large, the gas discharged from the lower end of the fixed tube 4 is small, indicating that the air permeability of the cloth 101 is weak; and to judge the amount of gas discharged from the upper end of the fixed tube 4, the distance between the distance sensor 8 and the porous sponge block 7 is sensed, and as the amount of gas discharged from the upper end of the fixed tube 4 becomes larger and larger, the air in the fixed tube 4 will also squeeze the porous sponge block 7 to move farther and farther upward, so that the distance between the porous sponge block 7 and the distance sensor 8 will also become closer and closer. In this way, the amount of gas discharged from the upper end of the fixed tube 4 can be judged according to the distance between the distance sensor 8 and the porous sponge block 7, and the distance sensor 8 will send out the sensed data signal, and the controller 9 will integrate the data after receiving the signal, and then the operator can evaluate the air permeability of the cloth 101 by viewing the integrated data on the controller 9, and then perform an air permeability test on the cloth 101;

[0033] After the air permeability test of the cloth 101 is completed, the fan 3 is turned off, so that the porous sponge block 7 in the fixed tube 4 falls down and resets due to the action of gravity, and then the electric push rod 1001 drives the sliding frame 1002, the storage tube 11 and the rubber ring 12 to move downward and reset, so that the cloth 101 on the rubber ring 12 is separated from the bottom end of the fixed tube 4, and the rubber ring 12 is restored to its original state, and then the cloth 101 can be removed from the rubber ring 12.

[0034] See also Figure 6 and Figure 7 As shown, it also includes a flattening mechanism, which includes a sleeve 13 and a sponge ring 14; the bottom end of the fixed tube 4 is connected to the sleeve 13; a sponge ring 14 is arranged on the inner side of the sleeve 13, and the inner diameter of the sponge ring 14 is slightly larger than the outer diameter of the placement tube 11, and the sponge ring 14 is used to increase the resistance of the fabric 101 outside the rubber ring 12 so as to flatten the fabric 101 inside the rubber ring 12.

[0035] By setting up the flattening mechanism, when the placing tube 11 and the rubber ring 12 drive the cloth 101 to move upward, the cloth 101 outside the rubber ring 12 will contact the sponge ring 14. At this time, the sponge ring 14 will increase the friction resistance to the cloth 101 outside the rubber ring 12. As the cloth 101 inside the rubber ring 12 continues to move upward, the cloth 101 inside the rubber ring 12 will be pulled by the cloth 101 outside the rubber ring 12, so as to flatten the cloth 101 inside the rubber ring 12, thereby flattening the cloth 101 inside the rubber ring 12 to prevent the cloth 101 inside the rubber ring 12 from affecting the test due to wrinkles.

[0036] See also Figure 8 As shown, it also includes a fixing mechanism, which includes a movable frame 15, a first magnetic ring 16 and a second magnetic ring 17; the movable frame 15 is slidably arranged on the lower side of the support frame 1; the first magnetic ring 16 is connected to the left side of the movable frame 15; the second magnetic ring 17 is arranged on the sliding frame 1002, and the second magnetic ring 17 is located directly below the first magnetic ring 16, and the first magnetic ring 16 is used to press the fabric 101 outside the rubber ring 12 onto the second magnetic ring 17 for fixing.

[0037] See also Figure 8 As shown, a third magnetic ring 18 is also included; the outer wall of the sleeve 13 is provided with the third magnetic ring 18, and the third magnetic ring 18 is located directly above the first magnetic ring 16. The third magnetic ring 18 is used to absorb the first magnetic ring 16 for limiting.

[0038] In the initial state, the first magnetic ring 16 is adsorbed on the bottom of the third magnetic ring 18;

[0039] After the cloth 101 is placed on the rubber ring 12 at the top of the storage tube 11, the movable frame 15 is pulled downward to move the first magnetic ring 16 downward, so that the first magnetic ring 16 is separated from the third magnetic ring 18. When the first magnetic ring 16 contacts the cloth 101 outside the rubber ring 12, the first magnetic ring 16 will squeeze the cloth 101 outside the rubber ring 12 downward until the first magnetic ring 16 presses the cloth 101 outside the rubber ring 12 downward onto the second magnetic ring 17, and the first magnetic ring 16 is adsorbed on the top of the second magnetic ring 17, so that the cloth 101 outside the rubber ring 12 can be fixed, thereby fixing the cloth 101 inside the rubber ring 12. The cloth 101 is fixed to prevent the cloth 101 on the rubber ring 12 from falling when it is raised; when the operator needs to take the cloth 101 off the rubber ring 12, the movable frame 15 is first lifted up to reset, thereby driving the first magnetic ring 16 to move up to reset, so that the first magnetic ring 16 releases the cloth 101 outside the rubber ring 12 on the second magnetic ring 17 until the first magnetic ring 16 contacts the bottom of the third magnetic ring 18, so that the first magnetic ring 16 is adsorbed on the bottom of the third magnetic ring 18, thereby limiting the first magnetic ring 16, and then the operator releases the movable frame 15 to take the cloth 101 off the rubber ring 12.

[0040] See also Figure 8-Figure 10 As shown, a separation mechanism is also included, which includes a fixed shaft 19, a rotating handle 20 and an elastic rope 21; a fixed shaft 19 is arranged on the left side of the first magnetic ring 16; the rotating handle 20 is rotatably installed on the fixed shaft 19, and a protruding structure is provided on the top right side and the bottom right side of the rotating handle 20, and the rotating handle 20 is used to separate the second magnetic ring 17 and the third magnetic ring 18 from the first magnetic ring 16; an elastic rope 21 is connected between the rotating handle 20 and the first magnetic ring 16.

[0041] When it is necessary to pull the movable frame 15 downward to drive the first magnetic ring 16 downward, the rotating handle 20 is first pressed to rotate, and the elastic rope 21 is deformed, so that the convex structure on the right side of the top of the rotating handle 20 is continuously inserted between the first magnetic ring 16 and the third magnetic ring 18, so that the first magnetic ring 16 and the third magnetic ring 18 are separated by using the convex structure on the right side of the top of the rotating handle 20, which can facilitate the operator to separate the first magnetic ring 16 and the third magnetic ring 18, and then the operator can easily pull the movable frame 15 downward to drive the first magnetic ring 16 downward, and then release the rotating handle 20, the elastic rope 21 returns to its original state, and the elastic rope 21 drives the rotating handle 20 to reverse and reset; when it is necessary to pull When the movable frame 15 is moved upward to reset, thereby driving the first magnetic ring 16 to move upward to reset, the rotating handle 20 is first lifted to reverse, and the elastic rope 21 is deformed, so that the raised structure on the right side of the bottom of the rotating handle 20 is continuously stuck between the first magnetic ring 16 and the second magnetic ring 17, so that the first magnetic ring 16 and the second magnetic ring 17 are separated by the raised structure on the right side of the bottom of the rotating handle 20, which can facilitate the operator to separate the first magnetic ring 16 and the second magnetic ring 17, and then the operator can easily lift the movable frame 15 to move upward to reset, thereby driving the first magnetic ring 16 to move upward to reset, and then release the rotating handle 20, the elastic rope 21 returns to its original state, and the elastic rope 21 drives the rotating handle 20 to rotate and reset.

[0042] See also Figure 8 As shown, a fiber filter 22 is also included; the fiber filter 22 is installed at the air inlet of the fan 3, and the fiber filter 22 is used to prevent dust from entering the fan 3.

[0043] By providing the fiber filter 22, the air entering the fan 3 can be filtered, thereby blocking the dust in the air, so as to prevent the fan 3 from introducing the dust in the air into the fixed pipe 4 to affect the air permeability test of the fabric 101.

[0044] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fabric air permeability testing device, comprising a support frame (1), characterized in that: A fixed handle (2) is arranged on the support frame (1), a fan (3) and a fixed pipe (4) are also arranged on the support frame (1), an air outlet of the fan (3) is connected to the side of the fixed pipe (4) through a connecting pipe (5), the connecting pipe (5) and the fixed pipe (4) form a T-shaped structure, a guide mechanism is arranged on the inner side of the fixed pipe (4), a porous sponge block (7) is arranged on the guide mechanism, the guide mechanism is used to guide the porous sponge block (7) when it moves inside the fixed pipe (4), a distance sensor (8) is also arranged on the guide mechanism, the distance sensor (8) is used to sense the distance between the porous sponge block (7), a controller (9) is installed on the side wall of the fixed pipe (4), the controller (9) is electrically connected to the distance sensor (8), a lifting mechanism is arranged on the support frame (1), A storage tube (11) is connected to the lifting mechanism. The storage tube (11) is located directly below the fixed tube (4). A rubber ring (12) is installed on the top of the storage tube (11). The rubber ring (12) on the top of the storage tube (11) is used to place a cloth (101). The lifting mechanism is used to drive the storage tube (11) to be lifted and lowered, so as to press the cloth (101) on the rubber ring (12) against the bottom end of the fixed tube (4) to perform an air permeability test.

2. A cloth air permeability testing device according to claim 1, characterized in that: The guide mechanism comprises a guide rod frame (601) and a slider (602). The guide rod frame (601) is installed inside the fixed tube (4), the guide rod frame (601) is connected to the distance sensor (8), the slider (602) is slidably arranged on the guide rod frame (601), and the slider (602) is connected to the porous sponge block (7).

3. A cloth air permeability testing device according to claim 2, characterized in that: The lifting mechanism comprises an electric push rod (1001) and a sliding frame (1002); the electric push rod (1001) is installed on the support frame (1); the sliding frame (1002) is slidably arranged on the support frame (1); the sliding frame (1002) is connected to the telescopic rod of the electric push rod (1001), and the storage tube (11) is connected to the sliding frame (1002).

4. A cloth air permeability testing device according to claim 3, characterized in that: The invention also comprises a flattening mechanism, which comprises a sleeve (13) and a sponge ring (14); one end of the fixed tube (4) close to the storage tube (11) is connected to the sleeve (13); a sponge ring (14) is arranged inside the sleeve (13); the sponge ring (14) is used to increase the resistance of the cloth (101) outside the rubber ring (12) so as to flatten the cloth (101) inside the rubber ring (12).

5. A cloth air permeability testing device according to claim 4, characterized in that: The invention also comprises a fixing mechanism, which comprises a movable frame (15), a first magnetic ring (16) and a second magnetic ring (17). The movable frame (15) is slidably arranged on the support frame (1), the first magnetic ring (16) is connected to the movable frame (15), the second magnetic ring (17) is arranged on the sliding frame (1002), the second magnetic ring (17) is located directly below the first magnetic ring (16), and the first magnetic ring (16) is used to press the cloth (101) outside the rubber ring (12) onto the second magnetic ring (17) for fixing.

6. A cloth air permeability testing device according to claim 5, characterized in that: It also includes a third magnetic ring (18). The outer wall of the sleeve (13) is provided with the third magnetic ring (18). The third magnetic ring (18) is located directly above the first magnetic ring (16). The third magnetic ring (18) is used to absorb the first magnetic ring (16) for position limiting.

7. A cloth air permeability testing device according to claim 6, characterized in that: The invention also comprises a separation mechanism, which comprises a fixed shaft (19), a rotating handle (20) and an elastic rope (21). The first magnetic ring (16) is provided with the fixed shaft (19), the rotating handle (20) is rotatably mounted on the fixed shaft (19), the rotating handle (20) is used to separate the second magnetic ring (17) and the third magnetic ring (18) from the first magnetic ring (16), and an elastic rope (21) is connected between the rotating handle (20) and the first magnetic ring (16).

8. The cloth air permeability testing device according to claim 7, characterized in that: It also includes a fiber filter (22), the fiber filter (22) being installed at the air inlet of the fan (3), and the fiber filter (22) being used to prevent dust from entering the fan (3).

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