Instrument for measuring air permeability of wound non-woven fabric

Abstract

The invention relates to the technical field of cloth measuring instruments, in particular to a wound non-woven fabric air permeability measuring instrument which comprises two symmetrically-arranged machine covers, a sealing structure is arranged between the two machine covers, and a non-woven fabric capable of being clamped by the sealing structure is arranged between the two machine covers. Two wrinkle structures are symmetrically arranged on the inner wall of each machine cover, each wrinkle structure comprises an air pipe, the outer side wall of each air pipe is sleeved with a plurality of shells, vent holes are formed in the two sides of each shell, a telescopic pipe is fixedly connected between every two shells, and a first spring is arranged in a cavity of each telescopic pipe; according to the device, wrinkles of the non-woven fabric are simulated through the wrinkling structure, the wrinkled non-woven fabric is measured through the sealing structure, meanwhile, fiber residues on the outer surface of the non-woven fabric can be cleaned in the movement process of the telescopic pipe, and meanwhile when gas in the telescopic pipe is exhausted, the non-woven fabric is prevented from being damaged. And dust falling is carried out on the fibers at the lower cleaning end by conveying steam midway.

Description

Technical Field

[0001] This invention relates to the field of fabric measuring instruments, specifically to an instrument for measuring the air permeability of wound nonwoven fabrics. Background Technology

[0002] In modern industry and consumer sectors, wound nonwoven fabrics, with their lightweight, low-cost, and easy-to-process characteristics, have been widely used in key applications such as medical protection, hygiene products, filter materials, and agricultural coverings. One of the core performance characteristics of these products is "breathability." Medical masks need to reduce the wearer's breathing resistance while ensuring filtration efficiency; the breathability of diapers directly affects skin dryness, preventing stuffiness and discomfort; and the breathability of industrial filter materials is directly related to fluid flux and filtration accuracy.

[0003] However, in actual use of nonwoven fabrics, the products are generally not kept flat and taut for a long time, and wrinkles will appear. These situations also require corresponding air permeability measurements. However, the existing technology cannot measure the air permeability of nonwoven fabrics with different wrinkles, making it impossible for measuring instruments to obtain air permeability data for various situations of nonwoven fabrics. Summary of the Invention

[0004] The purpose of this invention is to provide an instrument for measuring the air permeability of wound nonwoven fabrics, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an instrument for measuring the air permeability of wound nonwoven fabric, comprising two symmetrically arranged machine covers, a sealing structure between the two machine covers, and a nonwoven fabric that can be clamped by the sealing structure between the two machine covers; Each of the machine covers has two symmetrically arranged pleated structures on its inner wall. Each pleated structure includes an air tube. The outer wall of the air tube is fitted with several outer shells. Each outer shell has ventilation holes on both sides. A telescopic tube is fixedly connected between each pair of outer shells. A spring is installed inside the cavity of the telescopic tube. A sliding plate is slidably connected to the outer wall of each outer shell. A connecting rod is fixedly connected to the side of the sliding plate away from the outer shell. A rotating wheel is rotatably connected to the outer wall of the connecting rod, and each rotating wheel can abut against the surface of the non-woven fabric. A Z-shaped push plate is fixedly connected to the side of the sliding plate away from the connecting rod. A spring is fixedly connected between the Z-shaped push plate and the inner wall of the outer shell. Each outer shell has a push piece fixedly connected to the air tube inside its cavity, and each push piece abuts against the Z-shaped push plate at the corresponding position. The upper end of the trachea is provided with a drive structure for driving the trachea to rotate. The lower end of the air pipe is provided with an exhaust heating structure; The upper end of each pleated structure is fixed and connected to the inner wall of the machine cover, and the lower end of the pleated structure is equipped with a clamping structure that can clamp and pull the non-woven fabric.

[0006] Preferably, the sealing structure includes an electric push plate 1, which is symmetrically and slidably connected to both sides of the machine cover, and the electric push plates 1 on the two machine covers that are positioned opposite each other can abut against each other. Each machine cover has a baffle fixedly connected to its upper and lower ends, and a sealing plate is slidably connected to the opposite side of the two baffles on each machine cover. A spring 2 is fixedly connected to the side of the sealing plate away from the nonwoven fabric, and the other end of the spring 2 is fixedly connected to the electric push plate 1.

[0007] Preferably, the drive structure includes a driven wheel, which is sleeved on the outer side wall of the upper end of the air pipe. A positioning frame is fixed between the two machine covers. Two drive wheels are rotatably connected to the upper end of the positioning frame. A transmission belt is sleeved on the outer side wall of each drive wheel and the corresponding driven wheel. A gear set two is installed on the upper end of the two drive wheels. A motor three is fixed to the lower end of the positioning frame, and the motor three can drive the drive wheels to rotate.

[0008] Preferably, the heating structure includes an exhaust pipe, which is fixedly connected to the lower end of each air pipe, and the two exhaust pipes on the same cover are symmetrical to each other. A sleeve is fixedly connected to the side surface of each exhaust pipe, and an air supply cylinder is rotatably connected to the inner side wall of each sleeve. A hot press cylinder is fixedly connected between the two air supply cylinders on the same cover, and the two hot press cylinders on the two covers can clamp the non-woven fabric. A gear set is installed on one side of the two adjacent air supply cylinders.

[0009] Preferably, each of the air pipes is rotatably connected to a rotating cylinder at its upper end, and an air intake plate is fixedly connected between two rotating cylinders on the same cover. A one-way valve is provided at the upper slot of the air pipe, a one-way valve is provided at the lower slot of the air pipe, and an external connecting pipe is installed at the upper end of the exhaust pipe.

[0010] Preferably, the clamping structure includes a sliding seat, which is fixedly connected to the lower end of each pleated structure. Each sliding seat has an electric push plate two fixedly connected to the side near the nonwoven fabric. A threaded rod is screwed to the inner side wall of the sliding seat. The threaded rod is rotatably connected to a baffle at a corresponding position. A motor one is fixedly connected to the outer side wall of the baffle, and the output end of the motor one is fixedly connected to the threaded rod.

[0011] Preferably, each cover has a bracket fixed to its upper end, and each bracket has an electric rotating wheel rotatably connected to its upper end, and the nonwoven fabric can be clamped between two electric rotating wheels.

[0012] Preferably, a worktable is fixedly connected to the outer side wall of both machine covers, a placement cylinder is provided at the lower end of the worktable, a second motor is fixedly connected to the lower end of the worktable, and the second motor can drive the gear set to rotate.

[0013] Compared with the prior art, the beneficial effects of the present invention are: During the extension of the telescopic tube, air is sucked and cleaned from the surface of the nonwoven fabric through the suction plate, reducing the fibers on the surface and improving the accuracy of the test. Then, the air permeability of the nonwoven fabric can be measured. After the nonwoven fabric is stretched to measure, the drive structure drives the air tube to rotate, which in turn drives the pleating structure to simulate the degree of wrinkling in the nonwoven fabric. After the measurement is completed, the hot press cylinder starts to rotate and transfer the nonwoven fabric into the placement cylinder. During the transfer, the motor releases the nonwoven fabric, and the threaded rod rotates, causing the sliding seat to rise again. During the lifting process, the telescopic tube will contract, allowing the fiber-containing gas inside the telescopic tube to be discharged into the exhaust pipe. At the same time, an external steam pump also supplies steam into the exhaust pipe through the external pipe to treat the fibers for dust removal. Then, during the steam discharge process, it passes through the hot press cylinder, so that both ends of the hot press cylinder are highly heated. During the transfer of the nonwoven fabric, the wrinkles generated when the two sides of the nonwoven fabric are sealed can be ironed out, so that the nonwoven fabric can be further processed and used, reducing the waste of resources. Attached Figure Description

[0014] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the structure of the present invention after the worktable is removed; Figure 5 This is a schematic diagram of the structure of the present invention after removing one of the covers; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a cross-sectional structural diagram of the hot press cylinder of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle; Figure 9 This is a cross-sectional view of the cover of the present invention; Figure 10 For the present invention Figure 9Enlarged view at point D; Figure 11 For the present invention Figure 9 Enlarged view at point E in the middle; Figure 12 This is a cross-sectional view of the outer casing of the present invention; Figure 13 For the present invention Figure 12 Enlarged view of point F in the image; Figure 14 This is a cross-sectional view of the air intake plate of the present invention; Figure 15 This is a cross-sectional view of the sealing plate of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1. Machine cover; 2. Outer shell; 3. Telescopic tube; 4. Air pipe; 5. Slide plate; 6. Connecting rod; 7. Rotary wheel; 8. Non-woven fabric; 9. Exhaust pipe; 10. Heat press cylinder; 11. Outer pipe; 12. Spring 1; 13. Electric rotary wheel; 14. Bracket; 15. Suction plate; 16. Rotating cylinder; 17. One-way valve 1; 18. One-way valve 2; 19. Electric push plate 1; 20. Baffle; 21. Sealing plate; 22. Spring 2; 23. Sliding seat; 24. Electric push plate II; 25. Threaded rod; 26. Motor I; 27. Vent hole; 28. Push plate; 29. ​​Z-shaped push plate; 30. Spring III; 31. Air supply cylinder; 32. Sleeve; 33. Gear set I; 34. Motor II; 35. Worktable; 36. Placement cylinder; 37. Driven wheel; 38. Transmission belt; 39. Drive wheel; 40. Positioning frame; 41. Gear set II; 42. Motor III. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-15 The present invention provides a technical solution: a wind-wound nonwoven fabric air permeability measuring instrument, comprising two symmetrically arranged machine covers 1, a sealing structure between the two machine covers 1, and a nonwoven fabric 8 that can be clamped by the sealing structure between the two machine covers 1. Each cover 1 has two symmetrically arranged pleated structures on its inner wall. The pleated structures include air pipes 4. Several outer shells 2 are fitted on the outer walls of the air pipes 4. Ventilation holes 27 are opened on both sides of the outer shells 2. A telescopic tube 3 is fixedly connected between each pair of outer shells 2. A spring 12 is installed in the cavity of the telescopic tube 3. A sliding plate 5 is slidably connected to the outer wall of each outer shell 2. A connecting rod 6 is fixedly connected to the side of the sliding plate 5 away from the outer shell 2. A rotating wheel 7 is rotatably connected to the outer wall of the connecting rod 6. Each rotating wheel 7 can abut against the surface of the non-woven fabric 8. A Z-shaped push plate 29 is fixedly connected to the side of the sliding plate 5 away from the connecting rod 6. A spring 30 is fixedly connected between the Z-shaped push plate 29 and the inner wall of the outer shell 2. A push piece 28 is fixedly connected to the air pipe 4 in the cavity of each outer shell 2. Each push piece 28 abuts against the Z-shaped push plate 29 at the corresponding position. The upper end of the trachea 4 is provided with a drive structure for driving the trachea 4 to rotate; An exhaust heating structure is provided at the lower end of the trachea 4; The upper end of each pleated structure is fixedly connected to and communicates with the inner wall of the cover 1, and the lower end of the pleated structure is provided with a clamping structure, which can clamp and pull the nonwoven fabric 8.

[0018] For details, please refer to Figure 5 and Figure 11 When each telescopic tube 3 is folded or stretched, the gas inside the telescopic tube 3 will be discharged or drawn into the air pipe 4. During the folding process of the telescopic tube 3, because the upper end of the pleated structure is fixed to the machine cover 1, the entire pleated structure will move upwards. Simultaneously, the gap between each outer shell 2 will decrease. This causes the air pipe 4 to rotate, causing the pusher 28 to push the Z-shaped pusher plate 29 towards the non-woven fabric 8. At the same time, the spring 30 is compressed. During the movement of the Z-shaped pusher plate 29, the slide plate 5, connecting rod 6, and rotating wheel 7 will also move accordingly. The connecting rod 6 is used to seal the outer shell 2, preventing gas inside the outer shell 2 from flowing between the two machine covers 1, which would affect the accuracy of the measurement of the non-woven fabric 8. During the movement of the rotating wheel 7, it will come into contact with the non-woven fabric 8 and push a localized area of ​​the non-woven fabric 8 to bend. (Refer to...) Figure 12The pleated structures on each cover 1 are located in different positions. Specifically, the rotating wheels 7 on the two covers 1 are staggered. This means that when the pleated structures on each cover 1 push the rotating wheels 7 to deform the nonwoven fabric 8, the nonwoven fabric 8 will deform in an interlaced manner, resulting in a wavy, curved state. As the distance pushed by the rotating wheels 7 increases, the amplitude of the wavy curvature of the nonwoven fabric 8 also increases, thus simulating the state of wrinkles on the nonwoven fabric 8. At the same time, during the bending process of the nonwoven fabric 8, the operator can increase the length of the nonwoven fabric 8 and then seal it with a sealing structure. After that, the air permeability is measured. Alternatively, if it is not necessary to test the wrinkles on the nonwoven fabric 8, after the nonwoven fabric 8 is stretched, the rotating wheels 7 can be used to push and push the nonwoven fabric 8 a small distance to increase the tension of the nonwoven fabric 8 and reduce the formation of wrinkles.

[0019] In this embodiment, the sealing structure includes an electric push plate 19, which is symmetrically slidably connected to both sides of the cover 1. The electric push plates 19 on the two covers 1 that are positioned opposite each other can abut against each other. Each cover 1 has a baffle 20 fixedly connected to both the upper and lower ends. Each cover 1 has a sealing plate 21 slidably connected to one side of the two baffles 20 opposite each other. A spring 22 is fixedly connected to the side of the sealing plate 21 away from the nonwoven fabric 8, and the other end of the spring 22 is fixedly connected to the electric push plate 19.

[0020] For details, please refer to Figure 15 Both the sealing plate 21 and the electric push plate 19 are equipped with sealing gaskets at the ends away from the machine cover 1. When the electric push plate 19 slides towards the nonwoven fabric 8, the sealing plate 21 will first come into contact with the nonwoven fabric 8. Then, when the sealing plates 21 on the two machine covers 1 touch each other through the nonwoven fabric 8, the electric push plate 19 continues to move and the spring 22 will start to compress until the electric push plates 19 on the two machine covers 1 touch each other through the nonwoven fabric 8, thereby achieving the sealing of both sides of the nonwoven fabric 8. Then, the air permeability of the nonwoven fabric 8 can be measured.

[0021] In this embodiment, the drive structure includes a driven wheel 37, which is sleeved on the outer side wall of the upper end of the air pipe 4. A positioning frame 40 is fixed between the two covers 1. Two drive wheels 39 are rotatably connected to the upper end of the positioning frame 40. A transmission belt 38 is sleeved on the outer side wall of each drive wheel 39 and the corresponding driven wheel 37. A gear set 41 is installed on the upper end of the two drive wheels 39. A motor 42 is fixed to the lower end of the positioning frame 40, and the motor 42 can drive the drive wheels 39 to rotate.

[0022] For details, please refer to Figure 6The gear set 41 consists of two meshing gears. When the motor 42 drives one of the drive wheels 39 to rotate, the gear set 41 enables the two drive wheels 39 to rotate in opposite directions. The transmission belt 38 then drives the driven wheel 37 to rotate, so that the air pipe 4 at the corresponding position can drive the pleated structure.

[0023] In this embodiment, the heating structure includes an exhaust pipe 9, which is fixedly connected to the lower end of each air pipe 4. The two exhaust pipes 9 on the same cover 1 are symmetrical to each other. A sleeve 32 is fixedly connected to the side surface of each exhaust pipe 9. An air supply cylinder 31 is rotatably connected to the inner side wall of each sleeve 32. A hot press cylinder 10 is fixedly connected between the two air supply cylinders 31 on the same cover 1. The two hot press cylinders 10 on the two covers 1 can clamp the non-woven fabric 8. A gear set 33 is installed on one side of the two adjacent air supply cylinders 31.

[0024] In this embodiment, a rotating cylinder 16 is rotatably connected to the upper end of each air pipe 4, and an air intake plate 15 is fixed between two rotating cylinders 16 on the same cover 1. A one-way valve 17 is provided at the upper slot of the air pipe 4, and a one-way valve 2 18 is provided at the lower slot of the air pipe 4. An external pipe 11 is installed at the upper end of the exhaust pipe 9.

[0025] Specifically, the suction plate 15, rotating cylinder 16, air pipe 4, outer shell 2, and telescopic tube 3 are connected. When the telescopic tube 3 changes from a folded state to an unfolded state, it draws air into the air pipe 4, and then the rotating cylinder 16 draws air from the slot of the suction plate 15. (Refer to...) Figure 14 The groove of the suction plate 15 faces the non-woven fabric 8, and the telescopic tube 3 changes from folded to unfolded state so that the electric push plate 2 can pull the non-woven fabric 8. During the extraction process, the surface of the non-woven fabric 8 will be continuously extracted as the extraction progresses, so that the fibers and dust on the surface of the non-woven fabric 8 can be sucked into the interior of the telescopic tube 3. This prevents the residual fibers and dust on the surface of the non-woven fabric 8 from affecting the accuracy of the air permeability measurement. At the same time, the one-way valve 17 ensures that gas can only be drawn into the interior of the air pipe 4 from the direction of the rotating cylinder 16. The gas pipe 4, exhaust pipe 9, sleeve 32, gas delivery cylinder 31, and hot press cylinder 10 are connected. When the telescopic pipe 3 retracts, the gas inside the telescopic pipe 3 flows back into the gas pipe 4. However, the one-way valve 17 prevents the gas from being discharged into the rotating cylinder 16. Therefore, all the gas is discharged into the exhaust pipe 9 through the one-way valve 2 18. The function of the one-way valve 2 18 is to ensure that the gas can only be discharged from the gas pipe 4 to the exhaust pipe 9. The external pipe 11 can be connected to a steam pump from the outside. When the gas inside the telescopic pipe 3 is discharged into the exhaust pipe 9, high-temperature steam is also discharged through the external pipe 11. The high-temperature steam will adhere to the fibers and dust in the gas discharged from the inside of the telescopic pipe 3, reducing the escape rate. Then, it is discharged into the gas delivery cylinder 31 through the sleeve 32, and then into the hot press cylinder 10 from the gas delivery cylinder 31. The hot press cylinder 10 has two non-contact valves inside. The interconnected spiral perforation structure allows steam to travel a longer distance before exiting from the other end of the hot press cylinder 10. After exiting, the moisture attached to the fibers and dust will adsorb each other, forming water droplets that are discharged, preventing workers from inhaling them into their mouths and noses. During the discharge process, the steam will heat the hot press cylinder 10, and the heating is progressive, prioritizing the heating of both ends of the hot press cylinder 10. At the same time, when the telescopic tube 3 needs to exhaust air, which is also the working process after measurement, the hot press cylinder 10 will rotate and drive the non-woven fabric 8 downward. During the conveying process, the hot press cylinder 10 will heat-press the non-woven fabric 8. At the same time, because the two sides of the non-woven fabric 8 are folded and sealed, the wrinkles are more obvious. The temperature on both sides of the hot press cylinder 10 is also higher, so the non-woven fabric 8 can be heat-pressed more specifically, reducing the wrinkles generated when the non-woven fabric 8 is sealed for measurement.

[0026] In this embodiment, the clamping structure includes a sliding seat 23, which is fixedly connected to the lower end of each pleated structure. Each sliding seat 23 is fixedly connected to an electric push plate 24 on the side near the nonwoven fabric 8. A threaded rod 25 is screwed to the inner side wall of the sliding seat 23. The threaded rod 25 is rotatably connected to a baffle 20 at the corresponding position. A motor 26 is fixedly connected to the outer side wall of the baffle 20, and the output end of the motor 26 is fixedly connected to the threaded rod 25.

[0027] In this embodiment, a bracket 14 is fixedly connected to the upper end of each cover 1, and an electric rotating wheel 13 is rotatably connected to the upper end of each bracket 14. The two electric rotating wheels 13 can clamp the non-woven fabric 8.

[0028] In this embodiment, a worktable 35 is fixedly connected to the outer side wall of the two machine covers 1. A placement cylinder 36 is provided at the lower end of the worktable 35. A second motor 34 is fixedly connected to the lower end of the worktable 35, and the second motor 34 can drive the first gear set 33 to rotate.

[0029] Specifically, motor 26 drives the threaded rod 25 at the corresponding position to rotate. During the rotation of the threaded rod 25, the sliding seat 23 moves, causing the sliding seat 23 to push the telescopic tube 3 to retract. When the sliding seat 23 is pushed to the upper limit position, the electric push plate 24 starts to clamp the nonwoven fabric 8. Then, the threaded rod 25 rotates in the opposite direction to reset the sliding seat 23, so that the electric push plate 24 carries the nonwoven fabric 8 to the lower end of the cover 1 and is then inserted between the two hot press cylinders 10. Motor 24 drives the gear set 33 to rotate. The gear set 33 consists of two meshing gears, so that the two hot press cylinders 10 also rotate in opposite directions, thus enabling the nonwoven fabric 8 to be transferred. After the nonwoven fabric 8 is measured for sealing, it can be transferred to the inside of the placement cylinder 36 for storage through the hot press cylinder 10.

[0030] Working principle: When measurement is required, the non-woven fabric 8 is placed between two electric rotating wheels 13. The electric rotating wheels 13 then transfer the non-woven fabric 8 between two machine covers 1. The electric push plate 24 clamps the non-woven fabric 8. Subsequently, the threaded rod 25 rotates in the opposite direction, driving the sliding seat 23 to move, pulling the non-woven fabric 8 downwards in a straight line. During this pulling process, the telescopic tube 3 extends, sucking air from the suction plate 15 to clean the surface of the non-woven fabric 8, reducing fibers on the surface and improving test accuracy. After the electric push plate 24 moves the non-woven fabric 8 to the bottom, it is also clamped by the hot press cylinder 10. Then, the air permeability of the non-woven fabric 8 can be measured. After the non-woven fabric 8 is stretched, the drive structure drives the air tube 4 to rotate, causing the air tube 4 to drive the pleating structure to fold the non-woven fabric. 8. Simulate the degree of wrinkling. After the measurement is completed, the hot press cylinder 10 starts to rotate and transfer the nonwoven fabric 8 into the placement cylinder 36. During the transfer, the motor 24 releases the clamp on the nonwoven fabric 8, and at the same time, the threaded rod 25 rotates and drives the sliding seat 23 to rise again. During the lifting process, the telescopic tube 3 will contract, so that the fiber-containing gas inside the telescopic tube 3 is discharged into the exhaust pipe 9. At the same time, the external steam pump also delivers steam into the exhaust pipe 9 through the external pipe 11 to treat the fibers for dust removal. Then, during the steam discharge process, it will pass through the hot press cylinder 10, so that the two ends of the hot press cylinder 10 are heated to a high degree. During the transfer of the nonwoven fabric 8, the wrinkles generated when the two sides of the nonwoven fabric 8 are sealed can be ironed out, so that the nonwoven fabric 8 can be processed and used again, reducing the waste of resources.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An instrument for measuring the air permeability of wound nonwoven fabric, comprising two symmetrically arranged covers (1), characterized in that: A sealing structure is provided between the two machine covers (1), and a non-woven fabric (8) that can be clamped by the sealing structure is provided between the two machine covers (1). Each of the machine covers (1) has two symmetrically arranged pleated structures on its inner wall. The pleated structures include air pipes (4). Several outer shells (2) are fitted on the outer walls of the air pipes (4). Ventilation holes (27) are opened on both sides of each outer shell (2). A telescopic tube (3) is fixedly connected between each pair of outer shells (2). A spring (12) is installed inside the cavity of the telescopic tube (3). A sliding plate (5) is slidably connected to the outer wall of each outer shell (2). A connecting plate is fixedly connected to the side of the sliding plate (5) away from the outer shell (2). The connecting rod (6) has a rotating wheel (7) rotatably connected to its outer side wall, and each rotating wheel (7) can abut against the surface of the non-woven fabric (8). The sliding plate (5) is fixedly connected to a Z-shaped push plate (29) on the side away from the connecting rod (6). A spring three (30) is fixedly connected between the Z-shaped push plate (29) and the inner side wall of the outer shell (2). Each cavity of the outer shell (2) is provided with a push piece (28) fixedly connected to the air pipe (4), and each push piece (28) abuts against the Z-shaped push plate (29) at the corresponding position. The upper end of the trachea (4) is provided with a drive structure for driving the trachea (4) to rotate; The lower end of the air pipe (4) is provided with an exhaust heating structure; The upper end of each pleated structure is fixed and connected to the inner wall of the cover (1), and the lower end of the pleated structure is provided with a clamping structure, which can clamp and pull the nonwoven fabric (8).

2. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: The sealing structure includes an electric push plate (19), which is symmetrically slidably connected to both sides of the cover (1), and the electric push plates (19) on the two covers (1) that are opposite to each other can abut against each other. Each cover (1) has a baffle (20) fixedly connected to both the upper and lower ends. Each cover (1) has a sealing plate (21) slidably connected to the opposite side of the two baffles (20). The sealing plate (21) is fixedly connected to a spring (22) on the side away from the nonwoven fabric (8), and the other end of the spring (22) is fixedly connected to the electric push plate (19).

3. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: The drive structure includes a driven wheel (37), which is sleeved on the outer side wall of the upper end of the air pipe (4). A positioning frame (40) is fixed between the two machine covers (1). Two drive wheels (39) are rotatably connected to the upper end of the positioning frame (40). A transmission belt (38) is sleeved on the outer side wall of each drive wheel (39) and the corresponding driven wheel (37). A gear set (41) is installed on the upper end of the two drive wheels (39). A motor (42) is fixed to the lower end of the positioning frame (40), and the motor (42) can drive the drive wheel (39) to rotate.

4. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: The heating structure includes an exhaust pipe (9), which is fixed to the lower end of each air pipe (4), and the two exhaust pipes (9) on the same cover (1) are symmetrical to each other. Each exhaust pipe (9) has a sleeve (32) fixed to its side surface, and each sleeve (32) has an air supply cylinder (31) rotatably connected to its inner side wall. A heat press cylinder (10) is fixed between the two air supply cylinders (31) on the same cover (1), and the two heat press cylinders (10) on the two covers (1) can clamp the non-woven fabric (8). A gear set (33) is installed on one side of the two adjacent air supply cylinders (31).

5. The air permeability measuring instrument for wound nonwoven fabric according to claim 4, characterized in that: Each of the air pipes (4) is rotatably connected to a rotating cylinder (16) at its upper end. A suction plate (15) is fixed between two rotating cylinders (16) on the same cover (1). A one-way valve (17) is provided at the upper slot of the air pipe (4), and a one-way valve (18) is provided at the lower slot of the air pipe (4). An external pipe (11) is installed at the upper end of the exhaust pipe (9).

6. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: The clamping structure includes a sliding seat (23), which is fixed to the lower end of each pleated structure. Each sliding seat (23) is fixed to an electric push plate (24) on the side near the nonwoven fabric (8). A threaded rod (25) is screwed to the inner wall of the sliding seat (23). The threaded rod (25) is rotatably connected to a baffle (20) at the corresponding position. A motor (26) is fixed to the outer wall of the baffle (20), and the output end of the motor (26) is fixed to the threaded rod (25).

7. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: Each cover (1) has a bracket (14) fixedly attached to its upper end, and each bracket (14) has an electric rotating wheel (13) rotatably connected to its upper end, and the two electric rotating wheels (13) can clamp the non-woven fabric (8).

8. The air permeability measuring instrument for wound nonwoven fabric according to claim 1, characterized in that: The outer walls of the two machine covers (1) are fixedly connected to a worktable (35). The lower end of the worktable (35) is provided with a placement cylinder (36). The lower end of the worktable (35) is fixedly connected to a motor (34), and the motor (34) can drive the gear set (33) to rotate.

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