A kind of sports clothing fabric air permeability detection device

Abstract

This invention relates to the field of fabric breathability testing technology, specifically to a device for testing the breathability of sportswear fabrics. The device includes a T-shaped base plate, with a guide rail fixed to its top surface. Multiple test chambers are slidably connected to the outer side of the guide rail. A lead screw, screwed into the test chambers, is rotatably connected to the top surface of the T-shaped base plate. A bidirectional lead screw is rotatably connected inside the guide rail, with two fabric shifting mechanisms screwed to both ends of the bidirectional lead screw. In this invention, two conveying wheels move closer together, keeping both the top and bottom of the fabric in a relaxed state. A bellows blows the top fabric, lifting it up. The breathability of the fabric is determined by the height of the lifted fabric. The bottom of the fabric gradually relaxes and falls into the test chambers. This allows for simultaneous breathability testing of the top fabric and application of different testing conditions to the bottom fabric, improving the accuracy of the breathability test results.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric breathability detection, and in particular to a device for detecting the breathability of sportswear fabrics. Background Art

[0002] Sportswear refers to clothing specifically designed for sports competitions. There are certain requirements for the breathability of sportswear. Because when athletes are engaged in sports activities, clothing fabrics that can effectively breathe can dissipate heat in a timely manner, improving the comfort of athletes' wear. Therefore, in the processing workshop of sportswear fabrics, it is necessary to randomly check the breathability of the fabrics in each production batch. At present, most fabric breathability detections are mainly divided into fabrics with qualified and unqualified breathability. Although it can roughly understand whether the breathability of the fabric meets the requirements, there are no specific breathable reference values for the fabric, which is not convenient for adjusting the material used in the subsequent processing of the fabric. Moreover, after the fabric is made into clothes, it will be worn in different environments, such as cold winter, hot summer, and it also needs to go through washing after wearing. At present, the fabric breathability detection devices in most workshops mainly detect the fabric when it has just been produced, and it is not convenient to apply different external environmental conditions to the fabric and then detect the breathability of the fabric, which affects the reference value of the fabric breathability detection result. Summary of the Invention

[0003] In order to overcome the above technical problems, the purpose of the present invention is to provide a device for detecting the breathability of sportswear fabrics. By moving two conveying wheels closer to each other, both the top and bottom of the fabric are in a relaxed state. The air box blows the fabric at the top to lift it, and the breathability of the fabric is judged according to the height of the lifted fabric. The bottom of the fabric gradually relaxes and falls into the working condition box, which is convenient for applying different working condition environments to the bottom of the fabric while detecting the breathability of the top of the fabric, facilitating the subsequent transmission of the fabric that has experienced different environments to the top for continuous breathability detection, combining the breathability detection of the fabric with the change of the external environment coherently, which is beneficial to improving the efficiency of fabric breathability detection and the accuracy of the fabric breathability detection result.

[0004] The purpose of the present invention can be realized by the following technical solutions:

[0005] A device for testing the breathability of sportswear fabric includes a T-shaped base plate. A guide rail is fixed to the top surface of the T-shaped base plate. Multiple test chambers are slidably connected to the outer side of the guide rail. A lead screw, screwed into the multiple test chambers, is rotatably connected to the top surface of the T-shaped base plate. A bidirectional lead screw is rotatably connected inside the guide rail. Two fabric shifting mechanisms are screwed to both ends of the bidirectional lead screw. Each fabric shifting mechanism includes a support base slidably connected to the guide rail. A connecting seat is fixed to the top of the support base. A shaft and a second shaft are rotatably connected to the top of the support base and the connecting seat, respectively. A conveyor wheel and a limiting wheel are respectively sleeved and fixed on the outer side of the second rod. A fabric belt is driven between the two conveyor wheels. A bellows is arranged in the middle of the fabric belt. A fan for blowing air into the bellows is fixed on the top surface of the T-shaped base plate. A limiting frame is arranged between the bellows and the fabric belt. A guide rail is fixed on the top surface of the T-shaped base plate. A lead screw is rotatably connected inside the guide rail. A movable seat is screwed on the outer side of the lead screw. A reference column and a cylinder for driving the reference column are fixed on the top surface of the movable seat. A pigment tray is slidably sleeved in the middle of the reference column. A driving mechanism is provided at the bottom of the pigment tray.

[0006] Furthermore, the top surface of the reference column is fixed with a push rod, one end of the push rod is fixed with multiple electric push rods, the output end of the electric push rod is fixed with a protrusion, the top surface of the pigment tray is evenly provided with multiple sets of pigment slots, each set of pigment slots includes three pigment holes, and the outer side of the top of the reference column is provided with a scale.

[0007] Furthermore, one end of the top rod is fixed with an inclined limiting shaft, the driving mechanism includes a sleeve that is rotatably sleeved with the reference column, the top end of the sleeve is fixedly connected to the paint tray, a gear is fixedly sleeved on the outer side of the top of the sleeve, a support plate is rotatably sleeved on the outer side of the bottom of the sleeve, a rack that meshes with the gear is slidably connected to the top surface of the support plate, one end of the rack is rotatably connected to a rotating seat that is slidably connected to the limiting shaft, and the output end of the cylinder is fixedly connected to the support plate.

[0008] Furthermore, the limiting frame includes two L-shaped rods that are fixedly connected to the guide rail, and an i-shaped shaft is slidably connected between the two L-shaped rods. Multiple pressing columns are fixed to the bottom of the i-shaped shaft.

[0009] Furthermore, the air outlet of the fan is connected to and fixed with an air supply pipe, and a support block fixedly connected to the T-shaped base plate is fixed to the outside of the air supply pipe. One end of the air box is connected to and fixed with a pipe connected to and fixed to the air supply pipe.

[0010] Furthermore, the pipe has two branch holes inside, both of which are connected to the bellows. A solenoid valve is connected in series inside the branch hole. A partition is fixed inside the bellows. A heating wire is fixed on the bottom surface of the partition. Mesh holes are provided on both the top and bottom surfaces of the bellows.

[0011] Furthermore, one end of each of the first and second shafts is fitted with a meshing gear two, a one-way bearing is provided between the second shaft and the corresponding gear two, and the second shaft is inserted and fixed to the position of the limiting wheel off-center.

[0012] Furthermore, a motor four for driving the shaft one to rotate is fixed on the outer side of the support base, and a motor three for driving the bidirectional lead screw to rotate is fixed at one end of the guide rail two.

[0013] Furthermore, both ends of the lead screw are rotatably fixed to the T-shaped base plate, and a motor for driving the lead screw to rotate is fixed to the outside of one of the fixed blocks. A liquid nitrogen cylinder for supplying nitrogen into the working chamber is fixed to the outside of one of the working chambers.

[0014] Furthermore, the top surface of the T-shaped base plate is fixed with a motor two for driving the lead screw two to rotate, and the inside of the guide rail two is fixed with a guide shaft that is slidably connected to the moving seat.

[0015] The beneficial effects of this invention are:

[0016] 1. By connecting the fabric belt through the transmission sleeve between the two conveyor wheels, the motor drives the shaft to rotate. Under the meshing transmission of the two gears, the rubber limiting wheel eccentrically arranged on the shaft rotates and squeezes onto the fabric belt, so that both ends of the fabric belt are fixed on the conveyor wheels. Then, the bidirectional screw rotates, causing the two support seats to move closer to each other with the two conveyor wheels, so that the top and bottom of the fabric belt are in a relaxed state. At this time, the fan delivers air to the air supply pipe. The air passes through a branch hole to the top of the air box partition, and then blows from the mesh on the top surface of the air box onto the relaxed fabric. The fabric is pushed upward by the wind. The height of the fabric is read according to the scale on the reference column. The greater the height, the worse the air permeability of the fabric. Conversely, the lower the height, the better the air permeability.

[0017] Meanwhile, the loose fabric at the bottom of the fabric belt is gradually pressed down into the corresponding working chamber under the gravity of multiple pressure columns. Multiple working chambers are set up. The left working chamber contains water, simulating a washing environment when the fabric is submerged. The middle working chamber is empty, and air is supplied to the space at the bottom of the air chamber partition via an air supply pipe. Heating wires on the bottom of the partition heat the air, and then the hot air is blown onto the fabric from the bottom of the air chamber, simulating a high-temperature environment. The right working chamber can be supplied with liquid nitrogen via a pipe. Liquid nitrogen is released and its vaporization absorbs heat to cool the test chamber, simulating a low-temperature environment for the fabric. By rotating the lead screw, the test chambers in different positions can be moved to the bottom of the limit frame. This allows different test environments to be applied to the bottom of the fabric while the top is being tested for breathability. This facilitates the transfer of fabrics that have experienced different environments to the top for continued breathability testing. This ensures that the breathability testing of the fabric is consistently integrated with changes in the external environment, which helps to improve the efficiency and accuracy of the fabric breathability test results.

[0018] 2. The cylinder output end moves the support plate, which in turn moves the pigment tray upwards via the sleeve, positioning it below the raised position of the relaxed fabric. At this point, the reference scale on the top surface of the pigment tray indicates the fabric's breathability. Simultaneously, the support plate moves the rack along the limiting shaft, causing the rack to rotate against the gear, which in turn moves the sleeve upwards, gradually rotating the pigment tray. The pigment tray contains eight pigment slots holding different colors of acrylic paint (not removed by washing), such as color one, color two, color three, etc. Color one is initially... The state is already aligned with the fabric. Color eight requires the pigment tray to rotate 360 ​​degrees to be aligned with the fabric. As the pigment tray rotates, different colors of pigment can be rotated to the front of the fabric. Then, the second lead screw moves the moving seat to move the reference column and the pigment tray to the bottom of the fabric. The electric push rod with the protrusion is inserted into the fabric so that the fabric is inserted into the sponge inside the pigment hole. The pigment water absorbed by the sponge stains the fabric. At this time, the breathability of the fabric can be intuitively judged according to the types of colors on the fabric. The reference standard is that the breathability of the fabric decreases from color one to color eight.

[0019] 3. By creating three pigment holes in each set of pigment trays, pigment of the same color can be placed in all three holes, but the color depth of the three holes can gradually decrease. The three colors can be labeled as light, primary, and dark. For example, when the pigment tray is rotated so that the pigment hole can just reach under the fabric, a light color can be applied to the fabric. When the pigment tray is rotated so that the pigment hole cannot just reach under the fabric, the pigment tray needs to be moved slightly up or down. At this time, moving the pigment tray up will cause the pigment hole to reach under the fabric, and a primary color can be applied. When the pigment tray is rotated so that the pigment hole cannot just reach under the fabric, the pigment tray needs to be moved slightly down or down. The pigment tray, when moved downwards, allows the pigment orifices to extend beneath the fabric, enabling the application of darker colors. Lighter colors indicate that the reference values ​​recorded by the pigment tray are accurate, primary colors indicate higher reference values, and dark colors indicate lower reference values. This facilitates later assessment of fabric surface color to determine breathability. Furthermore, the pigment tray can be moved to different positions beneath the fabric, allowing the same area to undergo sequential washing, high-temperature treatment, and low-temperature treatment, followed by color application along a straight line. The different colors indicate changes in breathability under different environmental conditions; identical colors suggest no change in breathability, while contrasting colors indicate a change. Attached Figure Description

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

[0021] Figure 1-3 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the T-shaped base plate, lead screw, and working condition box structure in this invention;

[0023] Figure 5 This is a schematic diagram of the fabric shifting mechanism in this invention;

[0024] Figure 6 This is a schematic diagram of the wind box and fan structure in this invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the bellows in this invention;

[0026] Figure 8 This is a schematic diagram of the limiting frame structure in this invention;

[0027] Figure 9 This is a schematic diagram of the overall structure of the outer side of the reference column in this invention;

[0028] Figure 10 This is a schematic diagram of the drive mechanism structure in this invention.

[0029] In the diagram: 100, T-shaped base plate; 110, lead screw one; 111, motor one; 120, guide rail two; 121, lead screw two; 1211, moving seat; 122, guide shaft; 130, motor two; 200, guide rail one; 210, working chamber; 211, liquid nitrogen cylinder; 212, limit bar; 220, bidirectional lead screw; 230, motor three; 300, fabric shifting mechanism; 310, support seat; 311, motor four; 320, connecting seat; 330, shaft one; 331, conveyor wheel; 340, shaft two; 341 400. Limiting wheel; 410. Air box; 411. Connecting pipe; 420. Branch hole; 500. Partition plate; 600. Fan; 610. Limiting frame; 620. L-shaped rod; 630. C-shaped shaft; 700. Lowering column; 710. Reference column; 710. Pigment tray; 711. Pigment hole; 720. Top rod; 721. Electric push rod; 7211. Protrusion; 722. Limiting shaft; 800. Drive mechanism; 810. Sleeve; 820. Gear 1; 830. Support plate; 840. Rack; 850. Rotating seat; A. Fabric belt. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-10As shown, a device for testing the breathability of sportswear fabric includes a T-shaped base plate 100. A guide rail 200 is fixed to the top surface of the T-shaped base plate 100. Multiple test chambers 210 are slidably connected to the outer side of the guide rail 200. A lead screw 110, screwed into the multiple test chambers 210, is rotatably connected to the top surface of the T-shaped base plate 100. A bidirectional lead screw 220 is rotatably connected inside the guide rail 200. Two fabric shifting mechanisms 300 are screwed to both ends of the bidirectional lead screw 220. Each fabric shifting mechanism 300 includes a support base 310 slidably connected to the guide rail 200. A connecting seat 320 is fixed to the top of the support base 310. A shaft 330 and a shaft 340 are rotatably connected to the tops of the support base 310 and the connecting seat 320, respectively. A conveyor wheel 331 and a limit wheel 341 are respectively sleeved and fixed on the outer side of the second rod 340. A fabric belt is connected between the two conveyor wheels 331. A bellows 400 is arranged in the middle of the fabric belt. A fan 500 for blowing air to the bellows 400 is fixed on the top surface of the T-shaped base plate 100. A limit frame 600 is arranged between the bellows 400 and the fabric belt. A guide rail 120 is fixed on the top surface of the T-shaped base plate 100. A lead screw 121 is rotatably connected inside the guide rail 120. A movable seat 1211 is screwed on the outer side of the lead screw 121. A reference column 700 and a cylinder for driving the reference column 700 are fixed on the top surface of the movable seat 1211. A pigment tray 710 is slidably sleeved in the middle of the reference column 700. A drive mechanism 800 is provided at the bottom of the pigment tray 710.

[0032] A top rod 720 is fixed to the top surface of the reference column 700. Multiple electric push rods 721 are fixed to one end of the top rod 720. A protrusion 7211 is fixed to the output end of the electric push rod 721. Multiple sets of pigment slots are evenly distributed on the top surface of the pigment tray 710. Each set of pigment slots includes three pigment holes 711. A scale is provided on the outer side of the top of the reference column 700. The electric push rods 721, along with the protrusions 7211, move to facilitate inserting the fabric into the pigment holes 711. A limiting shaft 722 is fixed to one end of the top rod 720. The drive mechanism 800 includes a sleeve 810 that is rotatably sleeved with the reference column 700. The top end of the sleeve 810 is connected to... The pigment tray 710 is fixedly connected. A gear 820 is fixedly sleeved on the outer top of the sleeve 810. A support plate 830 is rotatably sleeved on the outer bottom of the sleeve 810. A rack 840 that meshes with the gear 820 is slidably connected to the top surface of the support plate 830. One end of the rack 840 is rotatably connected to a rotating seat 850 that is slidably connected to the limiting shaft 722. The output end of the cylinder is fixedly connected to the support plate 830, so that the support plate 830 moves the pigment tray 710 on the sleeve 810 upward while the pigment tray 710 rotates, so that the different pigment holes 711 can move to the front of the fabric and change the scale on the reference column 700 at the same time.

[0033] The limiting frame 600 includes two L-shaped rods 610, each fixedly connected to the guide rail 200. A U-shaped shaft 620 is slidably connected between the two L-shaped rods 610. Multiple downward pressure columns 630 are fixed to the bottom of the U-shaped shaft 620. Under the gravity of the downward pressure columns 630, the loose fabric at the bottom gradually falls into the working chamber 210. An air supply pipe is fixedly connected to the air outlet of the fan 500. A support block fixedly connected to the T-shaped base plate 100 is fixed to the outside of the air supply pipe. One end of the air box 400 is fixedly connected to a connecting pipe 410 that is also fixedly connected to the air supply pipe, thereby allowing the air to... Machine 500 delivers air to the air box 400 to blow fabric; the inside of the connecting pipe 410 has two branch holes 411 that are connected to the air box 400. Solenoid valves are connected in series inside the branch holes 411. A partition 420 is fixed inside the air box 400. A heating wire is fixed on the bottom surface of the partition 420. Mesh holes are opened on the top and bottom surfaces of the air box 400. The solenoid valve controls whether the air needs to be blown into the lower and upper cavities of the air box 400. Heating with heating wire is existing technology, and the principle will not be elaborated. The support plates fixed at both ends of the air box 400 facilitate the support of the loose fabric.

[0034] Both shaft 1 (330) and shaft 2 (340) have meshing gears 2 fixedly fitted to one end. A one-way bearing is provided between shaft 2 (340) and the corresponding gear 2. Shaft 2 (340) is inserted and fixed to the limiting wheel 341 at an off-center position, so that shaft 1 (330) and shaft 2 (340) mesh and rotate simultaneously in only one direction. A motor 4 (311) for driving shaft 1 (330) to rotate is fixed to the outside of the support base 310. A motor 3 (230) for driving the bidirectional lead screw 220 to rotate is fixed to one end of the guide rail 2 (120). Thus, motor 4 (311) drives shaft 1 (330) to rotate, and motor 3 (230) drives the bidirectional lead screw 220 to rotate. Rotation; both ends of the lead screw 110 are fixed blocks that are fixedly connected to the T-shaped base plate 100. A motor 111 for driving the lead screw 110 to rotate is fixed on the outside of one of the fixed blocks. A liquid nitrogen bottle 211 for supplying nitrogen into the working chamber 210 is fixed on the outside of the working chamber 210 to facilitate the creation of a low-temperature environment in the working chamber 210. A motor 130 for driving the lead screw 121 to rotate is fixed on the top surface of the T-shaped base plate 100. A guide shaft 122 that is slidably connected to the moving seat 1211 is fixed inside the guide rail 120, so that the moving seat 1211 can stably move the paint tray 710.

[0035] Working principle: In use, place the same color pigment in the pigment holes 711 of each set of pigment tanks. 711a contains light-colored pigment, 711b contains primary-colored pigment, and 711c contains dark-colored pigment. The fabric belt is attached from one end of each of the two conveyor wheels 331 to the space between them. The distance between the two conveyor wheels 331 can be adjusted by rotating the bidirectional lead screw 220, allowing for the installation of fabric belts of different lengths. Motor 4 311 drives shaft 1 330 to rotate, causing the two conveyor wheels 331 to rotate in the same direction, conveying the fabric belt and transmitting the area to be inspected to the top front of the pigment tray 710. The fabric belt to be added to the working environment is conveyed above guide rail 2 120. Because a one-way bearing is installed between shaft 2 340 and gear 2, shaft 2 340 does not rotate simultaneously with shaft 1 330. Taking the washing condition as an example, motor 111 drives screw 110 to rotate, moving the central working chamber 210 above guide rail 2 120. Then, motor 4 311 rotates in the opposite direction, driving shaft 1 330. At this time, the two gears 2 mesh, causing the eccentrically arranged limiting wheel 341 on shaft 2 340 to rotate and press against the conveyor wheel 331, fixing both ends of the fabric belt on the conveyor wheel 331. Then, the bidirectional screw 2... Rotation 20 causes the two support seats 310, along with the two conveyor wheels 331, to move closer together, easing the tension at both the top and bottom of the fabric belt. At this time, the blower 500 delivers air to the air duct. The air passes through a branch hole 411 to the top of the baffle 420 of the air box 400, and then blows through the mesh on the top surface of the air box 400 onto the easing fabric. The fabric is pushed upwards by the airflow. The height of the fabric's rise is read from the scale on the reference column 710; a greater height indicates poorer air permeability, and vice versa. Simultaneously, the easing fabric at the bottom of the fabric belt is gradually pressed down by the gravity of the multiple pressing columns 630. Inside the corresponding working chamber 210, the C-shaped shaft 620 slides down the L-shaped rod 610, immersing the fabric in the water-filled working chamber 210. Then, the two conveyor wheels 331 move away from each other and are tensioned, allowing the wet fabric to be removed from the working chamber 210. The fabric is then fed into the space at the bottom of the partition 420 of the air box 400 through the air supply pipe. The heating wire on the bottom surface of the partition 420 heats the air, and then the hot air is blown from the bottom surface of the air box 400 onto the fabric to dry it, which is convenient for subsequent drying. However, the fabric that has been washed is tested for breathability. The limiting strip 212 on the bottom surface of the working chamber 210 makes it slide stably on the guide rail 200.

[0036] During the fabric breathability test, the cylinder output end moves the support plate 830 upwards. The support plate 830, through the sleeve 810, moves the pigment tray 710 upwards, causing the pigment tray 710 to move below the raised position of the relaxed fabric. At this time, the reference column 700 scale corresponding to the top surface of the pigment tray 710 reflects the breathability of the fabric; the higher the value, the worse the breathability. Simultaneously with the upward movement of the support plate 830, the support plate 830 slides along the limiting shaft 722, causing the rack 840 to rotate against the gear 820, thus moving the sleeve 810 upwards and gradually raising the pigment tray 710. As the paint tray 710 rotates, eight paint slots on it are pre-filled with acrylic paints of different colors, such as color one, color two, color three... color eight. Color one is initially aligned with the fabric, while color eight requires the paint tray 710 to rotate 360 ​​degrees to align with the fabric. With the rotation of the paint tray, the different colors of paint are moved to the front of the fabric. Then, the lead screw 121 moves the moving seat 1211, causing the reference post 700 to move the paint tray 710 under the fabric. An electric push rod 721 with a protrusion 7211 then inserts into the fabric, allowing the fabric to be aligned with the paint. Inside the hole 711, the sponge absorbs the pigment water, which then stains the fabric. The breathability of the fabric can be visually judged based on the color variations on the fabric; the reference standard is that the breathability decreases progressively from color one to color eight. Furthermore, when the pigment disc 710 rotates to the point where the pigment hole 711 can just reach the underside of the fabric, a light color 711a can be applied. When the pigment disc 710 rotates to the point where the pigment hole cannot just reach the underside of the fabric, the pigment disc 710 needs to be slightly moved up or down. Moving the pigment disc 710 upwards will cause the pigment hole 711 to extend under the fabric. The primary color 711b can be applied. When the pigment disk 710 is rotated to the point where the pigment hole 711 cannot be moved directly under the fabric, the pigment disk 710 needs to be slightly moved down or lowered. At this time, the pigment hole 711 will be moved under the fabric by moving the pigment disk 710 down, and the dark color 711c can be applied. Here, light color means that the reference value recorded by the pigment disk 710 has no error, primary color means that the reference value recorded by the pigment disk 710 is larger, and dark color means that the reference value recorded by the pigment disk 710 is not smaller. This makes it convenient to check the color of the fabric surface later to prepare for judging the breathability.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A device for testing the breathability of sportswear fabrics, comprising a T-shaped base plate (100), characterized in that, The top surface of the T-shaped base plate (100) is fixed with a guide rail (200). Multiple working condition boxes (210) are slidably connected to the outer side of the guide rail (200). The top surface of the T-shaped base plate (100) is rotatably connected with a lead screw (110) that is screwed into the multiple working condition boxes (210). The inside of the guide rail (200) is rotatably connected with a bidirectional lead screw (220). Both ends of the bidirectional lead screw (220) are screwed into two surfaces. The fabric shifting mechanism (300) includes a support base (310) slidably connected to a guide rail (200). A connecting seat (320) is fixed to the top of the support base (310). A shaft (330) and a shaft (340) are rotatably connected to the tops of the support base (310) and the connecting seat (320), respectively. A conveyor belt is sleeved and fixed to the outer sides of the shaft (330) and the shaft (340). The conveyor wheel (331) and the limiting wheel (341) are connected by a fabric belt. A bellows (400) is arranged in the middle of the fabric belt. A fan (500) for blowing air into the bellows (400) is fixed on the top surface of the T-shaped base plate (100). A limiting bracket (600) is arranged between the bellows (400) and the fabric belt. A guide rail (120) is fixed on the top surface of the T-shaped base plate (100). The guide rail 2 (120) is rotatably connected to the lead screw 2 (121), and the outer side of the lead screw 2 (121) is screwed to the moving seat (1211). The top surface of the moving seat (1211) is fixed with a reference column (700) and a cylinder for driving the reference column (700) to move. The middle part of the reference column (700) is slidably sleeved with a pigment disk (710), and the bottom of the pigment disk (710) is provided with a driving mechanism (800). The top surface of the reference column (700) is fixed with a push rod (720), one end of the push rod (720) is fixed with a plurality of electric push rods (721), the output end of the electric push rod (721) is fixed with a protrusion (7211), the top surface of the pigment tray (710) is evenly provided with a plurality of sets of pigment slots, each set of pigment slots includes three pigment holes (711), and the outer side of the top of the reference column (700) is provided with a scale. One end of the top rod (720) is fixed with an inclined limiting shaft (722). The driving mechanism (800) includes a sleeve (810) that is rotatably sleeved with the reference column (700). The top end of the sleeve (810) is fixedly connected to the pigment tray (710). A gear (820) is fixedly sleeved on the outer side of the top of the sleeve (810). A support plate (830) is rotatably sleeved on the outer side of the bottom of the sleeve (810). A rack (840) that meshes with the gear (820) is slidably connected to the top surface of the support plate (830). One end of the rack (840) is rotatably connected to a rotating seat (850) that is slidably connected to the limiting shaft (722). The output end of the cylinder is fixedly connected to the support plate (830).

2. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, The limiting frame (600) includes two L-shaped rods (610) that are fixedly connected to the guide rail (200). A U-shaped shaft (620) is slidably connected between the two L-shaped rods (610). A plurality of downward pressure columns (630) are fixed to the bottom of the U-shaped shaft (620).

3. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, The air outlet of the fan (500) is connected to and fixed with an air supply pipe. A support block that is fixedly connected to the T-shaped base plate (100) is fixed to the outside of the air supply pipe. One end of the air box (400) is connected to and fixed with a pipe (410) that is connected to and fixed with the air supply pipe.

4. The device for testing the breathability of sportswear fabrics according to claim 3, characterized in that, The inside of the connecting pipe (410) is provided with two branch holes (411) that are both connected to the bellows (400). A solenoid valve is connected in series inside the branch hole (411). A partition (420) is fixed inside the bellows (400). A heating wire is fixed on the bottom surface of the partition (420). Mesh holes are provided on the top and bottom surfaces of the bellows (400).

5. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, One end of each of the first shaft (330) and the second shaft (340) is fitted with a meshing gear 2. A one-way bearing is provided between the second shaft (340) and the corresponding gear 2. The second shaft (340) is inserted and fixed at a position off-center from the center of the limiting wheel (341).

6. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, The outer side of the support base (310) is fixed with a motor four (311) for driving the first shaft (330) to rotate, and one end of the guide rail two (120) is fixed with a motor three (230) for driving the bidirectional lead screw (220) to rotate.

7. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, Both ends of the lead screw (110) are fixed blocks that are fixedly connected to the T-shaped base plate (100). A motor (111) for driving the lead screw (110) to rotate is fixed on the outside of one of the fixed blocks. A liquid nitrogen bottle (211) for supplying nitrogen into the working chamber (210) is fixed on the outside of one of the working chambers (210).

8. The device for testing the breathability of sportswear fabrics according to claim 1, characterized in that, The top surface of the T-shaped base plate (100) is fixed with a motor (130) for driving the lead screw (121) to rotate, and the inside of the guide rail (120) is fixed with a guide shaft (122) that is slidably connected to the moving seat (1211).

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