Air permeability testing machine for air-permeable antibacterial woven special fabric

Abstract

This invention relates to the field of breathability testing technology, and provides a breathability testing machine for a special breathable and antibacterial woven fabric. The machine includes an operating table and a lower testing chamber installed at its bottom. An upper testing chamber is installed on the top of the operating table, and a biomimetic friction mechanism is installed inside the upper testing chamber. Feeding mechanisms are installed on both sides of the top of the operating table, and a connection port is provided at the opposite end of the upper and lower testing chambers. By incorporating a biomimetic friction mechanism, this invention can simulate the periodic friction, local compression, and micro-slippage dynamic mechanical behaviors between the fabric and skin during human activity, realistically reproducing the complex effects of protruding parts such as joints on the fabric. Based on this, breathability testing is performed simultaneously, enabling the assessment of the gradual or abrupt impact of microstructural changes caused by friction and compression on the breathability performance of the fabric during actual wear, thus providing a more comprehensive and realistic reflection of its functional performance in real-world usage environments.

Description

Technical Field

[0001] This invention relates to the field of breathability testing technology, and in particular to a breathability testing machine for a special breathable and antibacterial woven fabric. Background Technology

[0002] Special woven fabrics, especially those with both breathability and antibacterial properties, have become an important development direction in the textile industry in recent years. They are new materials and are widely used in high-end sportswear, medical textiles, outdoor equipment, underwear, and special protective clothing. Breathability is one of the core functional indicators of such fabrics, which is directly related to the wearer's thermal and moisture comfort and physiological health. Therefore, a special breathability testing machine is needed for testing. To address this, patent CN119269358B discloses a high-efficiency testing device for the air permeability of textile fabrics, including a mounting frame. The mounting frame has an internal horizontal adjustment mechanism, and two testing cylinders, a first testing cylinder and a second testing cylinder, are slidably mounted on the front of the mounting frame. This invention, by reserving operating space on both sides of the textile fabric and using a distribution-type air supply component to introduce pressurized air into the processing component, allows the processing component to actively move and approach the sides of the textile fabric, maintaining contact. Subsequently, a power mechanism drives the rotation of the rotating component, achieving rotation of the processing component. This cleans the sides of the textile fabric to be tested within the reserved cavity through frictional contact. On one hand, it removes surface-adhered particles, preventing them from clogging the gaps in the textile fabric; on the other hand, it cleans accumulated fibers on the surface of the textile fabric, preventing these fibers from affecting air permeability at the gaps, thus ensuring effective and accurate air permeability testing. The aforementioned air permeability testing equipment uses a power mechanism to drive the rotation of rotating components, and cleans the two sides of the textile fabric to be tested by friction contact. However, the testing process itself is still a traditional, static, single-point measurement without introducing any dynamic pressure. Its "efficiency" is reflected in reducing manual cleaning, but it has not made a breakthrough in the depth and breadth of measurement information. Summary of the Invention

[0003] The purpose of this invention is to provide a breathability testing machine for breathable and antibacterial woven special fabrics, in order to solve the shortcomings of existing breathability testing machines that only provide a single testing effect.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a breathability testing machine for a breathable and antibacterial woven special fabric, comprising an operating table and a lower testing chamber installed at its bottom; an upper testing chamber is installed on the top of the operating table, and a biomimetic friction mechanism is provided inside the upper testing chamber; feeding mechanisms are installed on both sides of the top of the operating table; a connection port is provided at one end of the upper testing chamber and the lower testing chamber respectively; the biomimetic friction mechanism includes a fixed frame fixed inside the upper testing chamber, and a connecting frame is provided at the bottom of the fixed frame; a cross is installed inside the connecting frame; an internal gear is slidably installed on the inner wall of the fixed frame; support cylinders are provided on both sides of the top of the connecting frame; a gear set is installed on one side of the top of the connecting frame; a second driving gear is provided on the top of the connecting frame; and a first driving gear is installed on one side of the second driving gear.

[0005] Preferably, the feeding mechanism includes clamping shafts disposed on both sides of the top of the operating table, and a feeding shaft is installed on the inner side of the clamping shafts. Both ends of the feeding shaft and the clamping shaft are provided with bases.

[0006] Preferably, a clamping block is provided at the top of the feeding shaft, and a first locking block is fixed at both ends of the clamping block. The opposite sidewalls of the feeding shaft and the clamping block are provided with teeth, and springs are installed at both ends of the feeding shaft and the clamping block.

[0007] Preferably, a pressure plate is provided at the top of the clamping shaft, and a pressure shaft is rotatably installed at the bottom of the pressure plate. A second locking block is fixed at both ends of the pressure plate, and a spring is installed at both ends of the clamping shaft and the pressure plate.

[0008] Preferably, the base and the first and second locking blocks form a sliding structure. Both sides of the interior of the base are equipped with protrusions, and the tops of the protrusions are angled. The outer sides of the protrusions are provided with grooves, and the tops of the grooves are equipped with connecting rods. The ends of the connecting rods and the grooves are angled.

[0009] Preferably, the top of the connecting frame is fixed with an annular groove, the top of the connecting frame is provided with a connecting cylinder, and the connecting cylinder and the connecting frame form a sliding structure. The top of the connecting cylinder is equipped with a first transmission gear, and the first transmission gear and the first driving gear are meshed together.

[0010] Preferably, friction heads are installed at equal intervals at the bottom of the cross, and a connecting plate is installed at the top of the cross, with the connection between the connecting plate and the cross forming a ball joint structure.

[0011] Preferably, a connecting gear is installed on one side of the connecting frame, and the connecting gear and the gear set are meshed together, and the gear set and the internal gear are meshed together.

[0012] Preferably, each of the support cylinders is equipped with a lead screw, and a second transmission gear is fixed to the top of each lead screw. The support cylinder and the annular groove form a sliding structure, and the second transmission gear and the second drive gear are meshed together.

[0013] Preferably, the connection port includes a lower airbag installed on the top of the lower detection chamber, and side airbags are provided on both the inner and outer sides of the lower airbag. The side airbags and the lower airbag are connected to each other, and an upper airbag is provided at the bottom of the upper detection chamber at the top of the lower airbag.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the breathability testing machine for the breathable and antibacterial woven special fabric can accurately simulate the human walking and joint flexion state through a dynamic biomimetic friction mechanism, and truly reflect the changes in the breathability performance of the fabric caused by friction during actual wear; combined with the adaptive flexible airbag sealing system, it realizes non-destructive clamping and high-precision measurement, and greatly improves the testing efficiency through automated testing process; 1. By incorporating a biomimetic friction mechanism, it can simulate the dynamic mechanical behaviors of periodic friction, local compression, and micro-slippage between the fabric and skin during human activity. It can not only uniformly and repeatedly rub the fabric surface, but also achieve multi-angle random pressure from the friction head through a ball joint structure and gear transmission, realistically replicating the complex effects of protruding parts such as joints on the fabric. On this basis, breathability testing can be performed simultaneously to assess the gradual or abrupt impact of microstructural changes caused by friction and compression on the breathability of the fabric during actual wear, thus more comprehensively and realistically reflecting its functional performance in real-world usage environments. 2. By setting up a feeding mechanism and cooperating with electric slide rails, the automatic traction, tensioning, positioning and fixing of the fabric to be inspected is realized. While the current fabric test is completed, the next fabric can be pre-loaded. After the test is completed, the upper detection chamber is raised, the old fabric can be quickly pulled out, and the new fabric is automatically sent to the detection area. This minimizes manual intervention, eliminates the time loss and operation error caused by fabric clamping and alignment, and enables the equipment to have continuous and batch testing capabilities. Furthermore, the feeding mechanism adopts a spring and slider linkage clamping mechanism, which can quickly complete the clamping and release of the fabric with one-button pressing. After the test is completed, it can be quickly switched to achieve an efficient batch testing process, which significantly improves the testing efficiency of the laboratory or production line. 3. By incorporating an airbag-type connection design, the upper and lower detection chambers achieve adaptive expansion and sealing through pneumatic coupling between the airbags when closed. This allows the airbags to conform to fabric surfaces of varying thicknesses and elasticities, forming a uniform and flexible annular sealing band at the edge of the test area. This solves the technical challenges of traditional rigid clamps that easily lead to edge leakage, uneven pressure, or damage to the fabric's microstructure. While ensuring high sealing performance, it achieves non-destructive and stable clamping of the fabric, providing a fundamental guarantee for obtaining high-precision and repeatable air permeability data. Attached Figure Description

[0015] Figure 1 This is a top-view three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below; Figure 3 This is a top-view three-dimensional structural diagram of the upper detection cavity of the present invention in a cut-open state; Figure 4 This is a three-dimensional structural diagram of the upper detection cavity of the present invention, viewed from below in a cross-sectional state; Figure 5 This is a top-view three-dimensional structural diagram of the biomimetic friction mechanism of the present invention; Figure 6 This is a three-dimensional structural diagram of the biomimetic friction mechanism of the present invention, viewed from below. Figure 7 This is a top-view three-dimensional structural diagram of the connecting frame of the present invention; Figure 8 This is a three-dimensional structural diagram of the connecting frame of the present invention, viewed from below. Figure 9 This is a three-dimensional structural diagram of the annular groove of the present invention in its cut-open state; Figure 10 This is a three-dimensional structural diagram of the operating table of the present invention; Figure 11 This is a three-dimensional structural diagram of the feeding shaft of the present invention; Figure 12 This is a three-dimensional structural diagram of the clamping shaft of the present invention; Figure 13 This is a top-view three-dimensional structural diagram of the base of the present invention in a cut-out state; Figure 14 This is a three-dimensional structural diagram of the base of the present invention viewed from below in a cut-out state; Figure 15 This is a three-dimensional structural diagram of the movable sleeve in its open state according to the present invention; Figure 16 This is a three-dimensional structural diagram of the lower detection cavity of the present invention; Figure 17 For the present invention Figure 16 A magnified schematic diagram of the structure at point A in the middle.

[0016] The following are the annotations in the figure: 1. Operating table; 2. Upper detection chamber; 3. Feeding mechanism; 31. Feeding shaft; 311. Clamping block; 312. First clamping block; 32. Clamping shaft; 321. Pressure plate; 322. Pressure shaft; 323. Second clamping block; 33. Base; 331. Protrusion; 332. Connecting rod; 333. Groove; 4. Lower detection chamber; 5. Bionic friction mechanism; 51. Fixing frame; 52. Connecting frame; 521. Annular groove; 522. First transmission gear; 523. Connecting cylinder; 53. Cross; 531. Friction head; 532. Connecting plate; 533. Connecting gear; 54. First driving gear; 55. Second driving gear; 56. Support cylinder; 561. Second transmission gear; 562. Lead screw; 57. Gear set; 58. Internal gear; 6. Connecting port; 61. Lower airbag; 62. Side airbag; 63. Upper airbag. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-17 This invention provides a breathability testing machine for a breathable and antibacterial woven special fabric, comprising an operating table 1 and a lower testing chamber 4 installed at its bottom; an upper testing chamber 2 is installed on the top of the operating table 1, and a biomimetic friction mechanism 5 is provided inside the upper testing chamber 2; feeding mechanisms 3 are installed on both sides of the top of the operating table 1; and a connection port 6 is provided at the opposite end of the upper testing chamber 2 and the lower testing chamber 4; the feeding mechanism 3 includes clamping shafts 32 disposed on both sides of the top of the operating table 1, and a feeding shaft 31 is installed on the inner side of the clamping shafts 32; both ends of the feeding shaft 31 and the clamping shaft 32 are provided with bases 33; a clamping block 311 is provided on the top of the feeding shaft 31, and first locking blocks 312 are fixed at both ends of the clamping block 311; the feeding shaft 31 and the clamping... The opposite sidewalls of block 311 are provided with teeth. Springs are installed at both ends of the feeding shaft 31 and the clamping block 311. A pressure plate 321 is provided at the top of the clamping shaft 32, and a pressure shaft 322 is rotatably installed at the bottom of the pressure plate 321. A second locking block 323 is fixed at both ends of the pressure plate 321. Springs are installed at both ends of the clamping shaft 32 and the pressure plate 321. A sliding structure is formed between the base 33 and the first locking block 312 and the second locking block 323. A protrusion 331 is installed on both sides inside the base 33, and the tops of the protrusions 331 are angled. A groove 333 is provided on the outer side of the protrusions 331, and a connecting rod 332 is installed at the top of the groove 333. The ends of the connecting rod 332 and the groove 333 are angled. Reference Figures 10-14 As shown, when using this device, one end of the fabric to be tested is passed sequentially under the adjacent clamping blocks 311 and pressure plate 321. After the fabric is stretched flat, the clamping blocks 311 are pressed down, causing the first locking blocks 312 at both ends to slide inside the base 33. The lower sides of the first locking blocks 312 are at an angle to the inner top of the protrusions 331. When the first locking blocks 312 press down, the protrusions 331 slide to both sides due to the angled shape. The first locking blocks 312 continue to move down to the bottom of the protrusions 331, and the protrusions 331 lose the pressure of the first locking blocks 312. Springs are provided on the outer side of the protrusions 331. Under the rebound force of the springs, the protrusions 331 are pushed towards the middle position, which acts as a locking mechanism on the top of the first locking blocks 312, fixing the position of the clamping blocks 311. The feed shaft 31 and the outer sides of the clamping blocks 311 are both provided with teeth. When pressed against the feeding shaft 31, it clamps and fixes the fabric. Then, the pressure plate 321 is pressed to move the second clamping block 323 to the bottom of the protrusion 331 and fix it. The pressure shaft 322 and the clamping shaft 32 are pressed together, which limits the fabric between them. The fabric is fixed. An electric slide rail is installed below the feeding shaft 31. The electric slide rail is started to drive the feeding shaft 31 and one end of the fixed fabric to move horizontally from the top of the lower detection cavity 4, from one side of the lower detection cavity 4 to the other side, thereby stretching the fabric flat to the top of the lower detection cavity 4. Because the pressure shaft 322 and the pressure plate 321 are rotatably connected, the pressure shaft 322 and the clamping shaft 32 can limit the fabric. However, when the feeding shaft 31 pulls the fabric, the fabric can slide smoothly to one side through the pressure shaft 322. The feeding mechanism 3 stretches and places the fabric to avoid the need to manually keep it stretched flat before detection and fixing due to fabric wrinkles. The connection port 6 includes a lower airbag 61 installed on the top of the lower detection chamber 4, and side airbags 62 are provided on both the inner and outer sides of the lower airbag 61. The side airbags 62 and the lower airbag 61 are connected. An upper airbag 63 is provided at the bottom of the upper detection chamber 2 at the top of the lower airbag 61. Reference Figures 1-4 and Figure 17 As shown, when the fabric is moved to cover the top of the lower detection chamber 4, both ends of the upper detection chamber 2 are equipped with electric screws. Activating the electric screws drives the upper detection chamber 2 to move downward, causing the bottom of the upper detection chamber 2 to press against the top of the lower detection chamber 4, thus squeezing and fixing the fabric. During the downward movement of the upper detection chamber 2, the upper airbag 63 squeezes the lower airbag 61, squeezing the gas inside the lower airbag 61 into the side airbag 62. This causes the inner and outer side airbags 62 to move and expand towards the middle simultaneously, tightly fitting the inner and outer walls of the upper airbag 63. Since both are airbags, they provide a sealing effect while protecting the fabric. The biomimetic friction mechanism 5 includes a fixed frame 51 fixed inside the upper detection cavity 2, and a connecting frame 52 is provided at the bottom of the fixed frame 51. A cross 53 is installed inside the connecting frame 52. An internal gear 58 is slidably installed on the inner wall of the fixed frame 51. Support cylinders 56 are provided on both sides of the top of the connecting frame 52. A gear set 57 is installed on one side of the top of the connecting frame 52. A second driving gear 55 is provided on the top of the connecting frame 52, and a first driving gear 54 is installed on one side of the second driving gear 55. An annular groove 521 is fixed on the top of the connecting frame 52. A connecting cylinder 523 is provided at the top of the connecting frame 52, and a sliding structure is formed between the connecting cylinder 523 and the connecting frame 52. A first transmission gear is installed at the top of the connecting cylinder 523. Wheel 522, and the first transmission gear 522 and the first driving gear 54 are meshed together. Friction heads 531 are installed at equal intervals at the bottom of the cross 53. A connecting plate 532 is installed on the top of the cross 53, and the connection between the connecting plate 532 and the cross 53 forms a ball joint structure. A connecting gear 533 is installed on one side of the connecting frame 52, and the connecting gear 533 is meshed with the gear set 57. The gear set 57 is meshed with the internal gear 58. A lead screw 562 is installed inside the support cylinder 56, and a second transmission gear 561 is fixed at the top of the lead screw 562. A sliding structure is formed between the support cylinder 56 and the annular groove 521. The second transmission gear 561 and the second driving gear 55 are meshed together. Reference Figures 3-9 and Figure 16As shown, when the fabric is fixed, a blower assembly is installed at the bottom of the lower detection chamber 4. Activating the blower assembly blows air upwards, and the airflow passes through the fabric and enters the upper detection chamber 2. A flow sensor is installed at the bottom of the upper detection chamber 2 to measure the volume or mass of air passing through the fabric. This measurement data is taken when the fabric is stationary. When detecting the actual behavior of the fabric on a human body, a servo motor is installed at the top of the second drive gear 55. Activating the servo motor drives the second drive gear 55 to rotate. The second drive gear 55 meshes with the second transmission gear 561, causing the second transmission gear 561 and the lead screw 562 below it to rotate simultaneously. The lead screw 562 is threadedly connected to the support cylinder 56. When the lead screw 562 rotates, the support cylinder 56 pushes the connecting frame 52 downwards, causing the friction head 531 to contact the fabric surface. A servo motor is installed at the top of the first drive gear 54. Activating the servo motor drives the first drive gear 54 to rotate. The first drive gear 54 meshes with the first transmission gear 522. The rotation of the first transmission gear 522 passes through the connecting cylinder 52. 3. The connecting frame 52 rotates, causing the entire cross 53 to rotate. This causes the friction head 531, which is in contact with the fabric, to reciprocate against the fabric surface, simulating the periodic friction between the fabric and the limbs due to movement. This assesses the gradual changes in the fabric's abrasion resistance, pilling resistance, and breathability. A cylinder is installed above the inner gear 58. Activating the cylinder pushes the inner gear 58 down to mesh with the gear set 57. When the connecting frame 52 rotates, the gear set 57 meshes and rotates inside the inner gear 58, causing the inner gear 58 to rotate. The connecting gear 533 below it rotates synchronously, and the rotation of the connecting gear 533 causes the connecting plate 532 to rotate. The connecting plate 532 is connected to the top ball joint of the cross 53. When rotating, the cross 53 swings 360° around the bottom center point as the fulcrum, and the friction head 531 at the bottom of the cross 53 randomly applies pressure to the surface of the fabric to simulate local micro-slippage and severe compression between the joint protrusion and the fabric, and to evaluate the fatigue resistance, structural integrity and retention rate of local breathability of the fabric. Reference Figure 1 , Figure 10 , Figure 14 and Figure 15As shown, during measurement, the upper part of the connecting rods 332 at both ends of the feeding shaft 31 is pressed down. Because the lower part of the connecting rods 332 is at an angle to the groove 333, when the connecting rods 332 are pressed down, the protrusions 331 are moved to both sides at the same time. At this time, the first locking block 312 loses its limit. Under the action of the spring rebound force at both ends of the feeding shaft 31, the clamping block 311 is pushed to move upward and reset, so one end of the fabric is no longer fixed. The fabric is then taken out from under the clamping block 311. Since the fabric has been fixed between the upper detection cavity 2 and the lower detection cavity 4, taking the fabric out from under the clamping block 311 does not affect the detection. After the new fabric to be tested is passed under the pressure plate 321 on the other side, and then under the clamping block 311, it is flattened and then the clamping block 311 and the pressure plate 321 are pressed again to fix the fabric to be tested. After the fabric in the testing area is tested, the electric screw is started to drive the upper testing chamber 2 to rise. The fabric in the testing area is no longer fixed and can be directly pulled out. Then the electric slide rail is started to drive the feeding shaft 31 and the fixed fabric to be tested to slide to one side, and then pass over the top of the lower testing chamber 4 from the other side to cover the top of the lower testing chamber 4, thereby saving the time of feeding.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A breathability testing machine for a breathable and antibacterial woven special fabric, comprising an operating table (1) and a lower testing chamber (4) installed at its bottom; Its features are: The top of the operating table (1) is equipped with an upper detection cavity (2), and the upper detection cavity (2) is equipped with a bionic friction mechanism (5). Feeding mechanisms (3) are installed on both sides of the top of the operating table (1). A connection port (6) is provided at the opposite end of the upper detection cavity (2) and the lower detection cavity (4). The biomimetic friction mechanism (5) includes a fixed frame (51) fixed inside the upper detection cavity (2), and a connecting frame (52) is provided at the bottom of the fixed frame (51). A cross (53) is installed inside the connecting frame (52). An internal gear (58) is slidably installed on the inner wall of the fixed frame (51). Support cylinders (56) are provided on both sides of the top of the connecting frame (52). A gear set (57) is installed on one side of the top of the connecting frame (52). A second driving gear (55) is provided on the top of the connecting frame (52), and a first driving gear (54) is installed on one side of the second driving gear (55). An annular groove (521) is fixed on the top of the connecting frame (52). A connecting cylinder (523) is provided at the top of the connecting frame (52), and a sliding structure is formed between the connecting cylinder (523) and the connecting frame (52). A first driving gear (54) is installed at the top of the connecting cylinder (523). The transmission gear (522) is meshed with the first transmission gear (522) and the first driving gear (54). Friction heads (531) are installed at equal intervals at the bottom of the cross (53). A connecting plate (532) is installed on the top of the cross (53). The connection between the connecting plate (532) and the cross (53) forms a ball joint structure. A connecting gear (533) is installed on one side of the connecting frame (52). The connecting gear (533) is meshed with the gear set (57). The gear set (57) is meshed with the internal gear (58). A lead screw (562) is installed inside the support cylinder (56). A second transmission gear (561) is fixed at the top of the lead screw (562). A sliding structure is formed between the support cylinder (56) and the annular groove (521). The second transmission gear (561) is meshed with the second driving gear (55).

2. The air permeability testing machine for a breathable and antibacterial woven special fabric according to claim 1, characterized in that: The feeding mechanism (3) includes clamping shafts (32) on both sides of the top of the operating table (1), and a feeding shaft (31) is installed on the inner side of the clamping shaft (32). Both ends of the feeding shaft (31) and the clamping shaft (32) are provided with bases (33).

3. The air permeability testing machine for a breathable and antibacterial woven special fabric according to claim 2, characterized in that: The top of the feeding shaft (31) is provided with a clamping block (311), and both ends of the clamping block (311) are fixed with first locking blocks (312). The sidewalls of the feeding shaft (31) and the clamping block (311) are provided with teeth. Both ends of the feeding shaft (31) and the clamping block (311) are equipped with springs.

4. The air permeability testing machine for a breathable and antibacterial woven special fabric according to claim 2, characterized in that: The clamping shaft (32) is provided with a pressure plate (321) at the top, and a pressure shaft (322) is rotatably installed at the bottom of the pressure plate (321). A second locking block (323) is fixed at both ends of the pressure plate (321), and a spring is installed at both ends of the clamping shaft (32) and the pressure plate (321).

5. The air permeability testing machine for a breathable and antibacterial woven special fabric according to claim 4, characterized in that: The base (33) and the first locking block (312) and the second locking block (323) all form a sliding structure. Both sides of the base (33) are equipped with protrusions (331), and the tops of the protrusions (331) are angled. The outer sides of the protrusions (331) are provided with grooves (333), and the tops of the grooves (333) are equipped with connecting rods (332). The ends of the connecting rods (332) and the grooves (333) are angled.

6. The air permeability testing machine for a breathable and antibacterial woven special fabric according to claim 1, characterized in that: The connection port (6) includes a lower airbag (61) installed on the top of the lower detection chamber (4), and side airbags (62) are provided on both the inner and outer sides of the lower airbag (61). The side airbags (62) and the lower airbag (61) are connected. An upper airbag (63) is provided at the bottom of the upper detection chamber (2) on the top of the lower airbag (61).

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