A compact fabric air permeability testing device

Abstract

The present invention relates to the field of textile detection technology, and discloses a compact woven fabric air permeability detection device, including a mounting frame, and also including: a detection chamber arranged on the mounting frame, the detection chamber including an upper cover chamber and a lower cover chamber, the upper cover chamber is fixed on the mounting frame, the lower cover chamber is arranged below the upper cover chamber and can be vertically lifted and lowered, and the upper cover chamber and the lower cover chamber are provided with side covers for placing meltblown cloth at the opposite edges; a heating plate arranged in the upper cover chamber, the heating plate is used to create a high temperature environment in the upper cover chamber; a cold circulation channel arranged in the lower cover chamber, the cold circulation channel is connected to an external circulation device, and is used to create a low temperature environment in the lower cover chamber, and the bottom of the lower cover chamber is provided with a channel connected to the outside world. The present invention can make the detection results more consistent and matched with the actual situation by simulating the real use environment, and reduce the deviation between the detection results and the required actual effect.

Description

Technical Field

[0001] The invention relates to the technical field of woven fabric detection, in particular to a device for detecting air permeability of compact woven fabrics. Background Art

[0002] Meltblown fabric is a kind of non-woven fabric. It is also called meltblown non-woven fabric. It is a non-woven fabric made of polypropylene as the main raw material through the meltblown process. Due to its good filtering, shielding, insulation and oil absorption properties, meltblown fabric is widely used in air and liquid filtration materials and other fields. Among them, meltblown fabric is the core material in masks because it can effectively filter particulate matter in the air and protect people from bacteria and viruses. At the same time, the air permeability of meltblown fabric is also one of the important indicators of whether the mask is comfortable during use.

[0003] At present, for example, Chinese patent CN116678801B discloses a meltblown nonwoven fabric air permeability detection device and detection method. The detection device can realize automatic fixation and air permeability detection of the meltblown nonwoven fabric through air pressure, and can also realize automatic unfolding of the meltblown nonwoven fabric and realize its flat laying operation. The whole process is automated, which can realize automatic fixation and automatic unfolding of the meltblown nonwoven fabric and automatic air permeability detection. The whole device has a high degree of automation, and does not require operators to perform complicated operations, which effectively improves the overall detection efficiency.

[0004] However, when meltblown cloth is used in masks, especially in winter, the water vapor in the exhaled breath will condense into water droplets due to the cold outside environment, and these water droplets attached to the meltblown cloth will affect its air permeability. Therefore, if the air permeability of the meltblown cloth is only tested in a dry state, the test situation will not be consistent with the actual situation, resulting in a mismatch between the test results and the actual required results, which in turn leads to large errors in the test results. Summary of the invention

[0005] The object of the present invention is to provide a device for detecting the air permeability of compact woven fabrics to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a compact woven fabric air permeability detection device, comprising a mounting frame, and further comprising:

[0007] A detection chamber is arranged on the mounting frame, the detection chamber comprises an upper cover chamber and a lower cover chamber, the upper cover chamber is fixed on the mounting frame, the lower cover chamber is arranged below the upper cover chamber and can be adjusted vertically, and side covers for placing meltblown cloth are arranged at opposite edges of the upper cover chamber and the lower cover chamber;

[0008] A heating plate is arranged in the upper cover cavity, and the heating plate is used to create a high temperature environment in the upper cover cavity;

[0009] A cold circulation channel is provided in the lower cover cavity, the cold circulation channel is connected to an external circulation device and is used to create a low temperature environment in the lower cover cavity, and a channel connected to the outside is provided at the bottom of the lower cover cavity;

[0010] The circulation part is installed on the upper cover cavity, and the circulation part performs cyclic air suction and air injection in the upper cover cavity, and when injecting air, air with steam is injected into the upper cover cavity to simulate human breathing;

[0011] A pressure sensor used to monitor changes in air pressure in the upper cover cavity.

[0012] Optionally, the mounting frame includes a bottom plate, a top plate is fixed above the bottom plate via two support columns, and the upper cover cavity is fixedly mounted between the two support columns via a fixing frame, and a cross plate is also fixed between the two support columns.

[0013] Optionally, the circulation part includes a piston cylinder rotatably mounted on the upper cover cavity via a support, an inner wall of the piston cylinder is slidably mounted with an integrally designed piston plate and a piston rod, and one end of the piston rod passes through the top of the piston cylinder, the outer wall of the cross plate is rotatably connected with a rocker rod, the top end of the piston rod is rotatably connected to the outer wall of the rocker rod via a connecting pin, a spring is connected between the top of the piston plate and the inner top of the piston cylinder, the bottom of the piston cylinder is connected with a connecting pipe connected to the interior of the upper cover cavity, the outer wall of the piston cylinder located below the piston plate is connected with a steam inlet pipe, the steam inlet pipe is connected to an external device for providing water vapor, and a one-way valve is also installed in the steam inlet pipe;

[0014] The circulation part also includes a driving member for driving the swing rod to swing back and forth.

[0015] Optionally, the driving member includes a lifting plate installed between two supporting columns and capable of being raised and lowered. A long slot is provided on the top of the lifting plate, and the rocker rod extends into the long slot and is limited by notches on both sides of the long slot. A fan-shaped plate is also rotatably installed in the middle of the lifting plate, and levers are fixed to the outer walls on both sides of the fan-shaped plate. The rocker rod is located between the two levers, and when the fan-shaped plate rotates, the lever can drive the rocker rod to swing. A driving motor for driving the fan-shaped plate to rotate back and forth at a uniform speed is also installed on the outer wall of the lifting plate.

[0016] Optionally, two groups of connecting rod structures are provided on the top of the base plate and are symmetrically arranged about the middle part of the lower cover cavity. The connecting rod structure includes adjustment blocks installed on the top of the base plate and can be adjusted closer to or away from each other. The two adjustment blocks are rotatably connected to the outer wall of the lower cover cavity with connecting rods, and the two connecting rods are arranged in relative oblique directions.

[0017] Optionally, a screw is rotatably installed between the top plate and the cross plate, the screw passes through the lifting plate and is threadedly connected to the penetration point of the lifting plate, and a servo motor for driving the screw to rotate is also installed on the top of the top plate.

[0018] Optionally, the rotation points of the sector plate, the rocker arm and the piston cylinder are all on the same vertical line, and the rotation point of the rocker arm is located between the other two.

[0019] Optionally, the surface of the side cover is provided with a groove for the meltblown cloth to be placed in, and the depth of the groove is less than half the thickness of the meltblown cloth.

[0020] Optionally, the inner wall and the outer wall of the upper cover cavity and the lower cover cavity are both provided with a thermal insulation layer structure.

[0021] Optionally, the bottom of the piston cylinder is provided with an expansion groove capable of allowing the connecting tube to move, and the expansion groove is closed at the connection point between the connecting tube and the interior of the piston cylinder.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention performs cyclical air suction and air injection in the upper cover cavity through the circulation part to simulate human breathing, and injects air with steam into the upper cover cavity during air injection to simulate the water vapor carried in the air when a person breathes, and then monitors the air pressure change in the upper cover cavity through the pressure sensor, so as to detect the pressure inside the upper cover cavity during air injection and air suction, thereby detecting the air permeability of the sample to be tested, and by simulating the actual use environment, the test result can be more closely matched with the actual situation, thereby reducing the deviation between the test result and the desired actual effect.

[0024] 2. The present invention can obtain a pressure change curve of the upper cover cavity by detecting the air pressure in the upper cover cavity through the pressure sensor. The curve can also reflect the attenuation curve of the air permeability of the sample to be tested, thereby making the test result more biased towards the actual test result, further improving the objective accuracy of the test result.

[0025] 3. The present invention can simulate the breathing frequency of a person in a real state by controlling the swing speed of the piston cylinder, thereby making the simulation of the breathing state more realistic, and further making the detection result closer to the real result, and the result detection is also more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the present invention;

[0027] Figure 2 It is a front perspective view of the present invention;

[0028] Figure 3 It is a back perspective view of the present invention;

[0029] Figure 4 It is a left side view of the present invention;

[0030] Figure 5 For the present invention Figure 4 Sectional view along AA;

[0031] Figure 6 For the present invention Figure 5 Cutaway stereogram of perspective;

[0032] Figure 7 For the present invention Figure 4 Sectional view along BB;

[0033] Figure 8 This is a state diagram of the lifting plate of the present invention after adjustment.

[0034] In the figure: 1. bottom plate; 2. top plate; 3. support column; 4. cross plate; 5. upper cover cavity; 6. lower cover cavity; 7. side cover; 8. pressure sensor; 9. piston cylinder; 10. lifting plate; 11. long groove; 12. piston rod; 13. steam inlet pipe; 14. fan-shaped plate; 15. lever; 16. rocker arm; 17. connecting pin; 18. piston plate; 19. spring; 20. connecting pipe; 21. cold circulation channel; 22. heating plate; 23. adjusting block; 24. connecting rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 The present invention provides a technical solution: a compact woven fabric air permeability detection device, including a mounting frame, and also including:

[0037] A detection chamber is arranged on the mounting frame, and the detection chamber includes an upper cover chamber 5 and a lower cover chamber 6. The upper cover chamber 5 is fixed on the mounting frame, and the lower cover chamber 6 is arranged below the upper cover chamber 5 and can be adjusted vertically. Side covers 7 for placing meltblown cloth are arranged at opposite edges of the upper cover chamber 5 and the lower cover chamber 6;

[0038] A heating plate 22 is disposed in the upper cover cavity 5, and the heating plate 22 is used to create a high temperature environment in the upper cover cavity 5;

[0039] A cold circulation channel 21 is provided in the lower cover cavity 6, the cold circulation channel 21 is connected to an external circulation device, and is used to create a low temperature environment in the lower cover cavity 6. A channel connected to the outside is provided at the bottom of the lower cover cavity 6;

[0040] The circulation part is installed on the upper cover cavity 5, and the circulation part performs cyclic air suction and air injection in the upper cover cavity 5, and when injecting air, air with steam is injected into the upper cover cavity 5 to simulate human breathing;

[0041] A pressure sensor 8 is used to monitor the air pressure changes in the upper cover cavity 5.

[0042] When the air permeability testing device is used, the lower cover cavity 6 is first controlled to move downward through the external structure to separate it from the upper cover cavity 5, and a gap is provided for inserting the meltblown fabric sample, which is hereinafter referred to as the sample to be tested. Then, after the sample to be tested is placed on the side cover 7, the lower cover cavity 6 is controlled to move upward to combine with the upper cover cavity 5 to form a complete testing cavity, and the sample to be tested separates the upper and lower cover cavities;

[0043] After placement, the upper cover cavity 5 is first heated by the heating plate 22 to create a high-temperature constant temperature environment in the upper cover cavity 5, preferably between 35-40 degrees to simulate human body temperature. At the same time, the cold circulation channel 21 in the lower cover cavity 6 creates a low-temperature environment in the lower cover cavity 6 under the drive of the external circulation device to simulate the cold environment of the outside. The circulation device can adopt a liquid cooling cycle or an air cooling cycle, which can be selected according to the ambient temperature to be simulated. If the ambient temperature to be simulated is above zero, a liquid cooling cycle can be selected, and if it is below zero, an air cooling cycle can be selected;

[0044] After creating a suitable temperature in the upper and lower cover cavities, the upper cover cavity 5 is cyclically inhaled and injected through the circulation part to simulate human breathing, and air with steam is injected into the upper cover cavity 5 during injection to simulate the water vapor carried in the air when a person breathes. Then, the pressure sensor 8 is used to monitor the air pressure change in the upper cover cavity 5, and the pressure inside the upper cover cavity 5 during injection and inhalation can be detected, so that the air permeability of the sample to be tested can be detected, and by simulating the real use environment, the test result can be more closely matched with the actual situation, reducing the deviation between the test result and the desired actual effect;

[0045] It is also worth mentioning that due to the temperature difference between the upper and lower cover cavities, when air is injected into the upper cover cavity 5, the water vapor therein will condense into water droplets when it is cold and infiltrate and adhere to the sample to be tested, thereby reducing the air permeability of the sample to be tested. In this way, as the monitoring time increases, the water content on the sample to be tested gradually increases, and the air permeability of the sample to be tested will gradually decrease. By detecting the air pressure in the upper cover cavity 5 by the pressure sensor 8, a curve of the change of its internal pressure can be obtained. According to this curve, the attenuation curve of the air permeability of the sample to be tested can also be reflected, thereby making the test result more biased towards the actual test result, further improving the objectivity and accuracy of the test result.

[0046] In one of the more preferred embodiments, an implementation of a mounting bracket is provided, which can be specifically referred to in Figure 2 and Figure 3 , to provide an installation location for subsequent structure installation;

[0047] The mounting frame includes a bottom plate 1 , a top plate 2 is fixed on the top of the bottom plate 1 via two support columns 3 , and an upper cover cavity 5 is fixedly mounted between the two support columns 3 via a fixing frame, and a cross plate 4 is also fixed between the two support columns 3 .

[0048] In one of the more preferred embodiments, an implementation of a circulation unit is provided;

[0049] The circulation part includes a piston cylinder 9 rotatably mounted on the upper cover cavity 5 through a support, an inner wall of the piston cylinder 9 is slidably mounted with an integrally designed piston plate 18 and a piston rod 12, and one end of the piston rod 12 passes through the top of the piston cylinder 9, the outer wall of the cross plate 4 is rotatably connected with a swing rod 16, the top of the piston rod 12 is rotatably connected to the outer wall of the swing rod 16 through a connecting pin 17, a spring 19 is connected between the top of the piston plate 18 and the inner top of the piston cylinder 9, the bottom of the piston cylinder 9 is connected with a connecting pipe 20 connected to the inside of the upper cover cavity 5, the outer wall of the piston cylinder 9 located below the piston plate 18 is connected with a steam inlet pipe 13, the steam inlet pipe 13 is connected to an external device for providing water vapor, and a one-way valve is also installed in the steam inlet pipe 13;

[0050] The circulation unit further includes a driving member for driving the swing rod 16 to swing back and forth.

[0051] For details, please refer to Figure 5 and Figure 6When it is necessary to inhale and inject air into the upper cover cavity 5, the driving member is used to drive the swing rod 16 to swing, and then the swing rod 16 drives the piston rod 12 and the piston cylinder 9 to rotate through the connecting pin 17, and during the rotation, the piston rod 12 will also slide upward in the piston cylinder 9, thereby inhaling air through the steam inlet pipe 13 and the connecting pipe 20, and at the same time, the spring 19 will also begin to compress and accumulate elastic potential energy. The connecting pipe 20 can inhale air into the upper cover cavity 5, and the steam inlet pipe 13 inhales water vapor or air containing water vapor into the piston cylinder 9, preparing for subsequent gas injection;

[0052] When the piston cylinder 9 and the rocker arm 16 rotate to a vertical state, the piston rod 12 is at a critical position of the inhalation state. When the piston cylinder 9 continues to rotate and passes the vertical state, the piston rod 12 will slide downward in the piston cylinder 9, injecting all the air and water vapor therein into the upper cover cavity 5, completing the gas injection process, which corresponds to the exhalation process. The setting of the one-way valve in the steam inlet pipe 13 allows the steam inlet pipe 13 to only draw water vapor into the piston cylinder 9, so that the process of inhalation and exhalation can be completed by one swing of the piston cylinder 9. Similarly, the piston cylinder 9 can be driven to swing back and forth by the driving member to drive the rocker arm 16 to swing back and forth, thereby achieving a repeated process of inhalation and exhalation to simulate a normal breathing process of a person, and then complete the above-mentioned detection process.

[0053] In one of the more preferred embodiments, an implementation of the above-mentioned driving member is provided;

[0054] The driving member includes a lifting plate 10 which is installed between two supporting columns 3 and can be raised and lowered. A long groove 11 is provided on the top of the lifting plate 10. A rocker rod 16 extends into the long groove 11 and is limited by notches on both sides of the long groove 11. A fan-shaped plate 14 is also rotatably installed in the middle of the lifting plate 10. A lever 15 is fixed to the outer walls on both sides of the fan-shaped plate 14. The rocker rod 16 is located between the two levers 15. When the fan-shaped plate 14 rotates, the lever 15 can drive the rocker rod 16 to swing. A driving motor for driving the fan-shaped plate 14 to rotate back and forth at a uniform speed is also installed on the outer wall of the lifting plate 10.

[0055] For details, please refer to Figure 5 and Figure 7 , the fan-shaped plate 14 is driven by the driving motor to reciprocate at a uniform speed, and when the fan-shaped plate 14 swings, it will contact and move the swing rod 16 through the lever 15, thereby driving the piston rod 12 and the piston cylinder 9 to swing, and the reciprocating swing of the fan-shaped plate 14 can move the swing rod 16 to swing back and forth through the lever 15;

[0056] It is worth noting that, when the lever 15 contacts the swing rod 16 and drives it to rotate, the contact position between the lever 15 and the swing rod 16 will gradually move upward, that is, the contact position between the lever 15 and the swing rod 16 will gradually move away from the rotation center of the swing rod 16, and since the rotation speed of the sector plate 14 is uniform, the swing rod 16 will gradually slow down in the process of rotating from the inclined state to the vertical state, that is, first fast and then slow. When the swing rod 16 passes the vertical state, under the elastic force of the spring 19, the piston plate 18 and the piston rod 12 will slide into the piston cylinder 9, and the movement of the piston rod 12 will provide power for the swing rod 16 and drive it to swing rapidly, that is, in the second half of the rotation of the swing rod 16 from the vertical state to the inclined state, the swing rod 16 will be separated from the lever 15, and the subsequent rapid swing will be completed by the elastic force of the spring 19.

[0057] In this way, corresponding to the piston rod 12 and the piston cylinder 9, during the inhalation stage, the speed at which the piston rod 12 moves upward inside the piston cylinder 9 will gradually slow down, and during the injection stage, the piston rod 12 will quickly move downward under the action of the spring 19 to complete the injection. The purpose of this is that when a person breathes while wearing a mask, the speed of inhalation will gradually slow down, while the speed of exhalation is generally faster. By controlling the swinging speed of the piston cylinder 9, the breathing frequency of a person in a real state can be simulated, thereby making the simulation of the breathing state more realistic, and thus making the detection result closer to the real result, and the result detection is also more accurate.

[0058] It is worth mentioning that some people take deep breaths when wearing a mask to compensate for the breathing resistance they feel when wearing a mask, and deep breathing increases the amount of air inhaled or exhaled compared to normal breathing. Therefore, the position of the lifting plate 10 can be adjusted by an external mechanism to adjust the swing angle of the swing rod 16. For details, please refer to Figure 7 and Figure 8 The swing angle of the rocker arm 16 (as shown in a and a1) is related to the limit position of the long slot 11 on the rocker arm 16. Therefore, after the position of the lifting plate 10 is adjusted, the swing angle of the rocker arm 16 can be adjusted, and then the swing angle of the piston rod 12 and the piston cylinder 9 can be adjusted. The larger the swing angle of the piston cylinder 9, the greater the sliding stroke of the piston plate 18 driven by the piston rod 12 in the piston cylinder 9 (see b and b1), and vice versa. In this way, different breathing methods can be simulated by adjusting the position of the lifting plate 10, so that the detection results can be more diversified and more objective.

[0059] In one of the more preferred embodiments, an implementation method capable of controlling the vertical lifting and lowering adjustment of the lower cover cavity 6 is provided;

[0060] Two sets of connecting rod structures are symmetrically arranged about the middle part of the lower cover cavity 6 at the top of the base plate 1. The connecting rod structure includes an adjustment block 23 installed on the top of the base plate 1 and can be adjusted closer or farther away from each other. The two adjustment blocks 23 are rotatably connected to the outer wall of the lower cover cavity 6 by connecting rods 24, and the two connecting rods 24 are relatively obliquely arranged.

[0061] For details, please refer to Figure 1 and Figure 2 By controlling the two adjustment blocks 23 to move closer or farther from each other, the lower cover cavity 6 can be driven to rise and fall through the connecting rod 24 to put in or take out the sample to be tested. At the same time, the symmetrical arrangement of the connecting rod structure on both sides can provide a stable support for the lower cover cavity 6 to prevent it from deflecting. When in use, a guide rod can be added between the lower cover cavity 6 and the bottom plate 1 to improve the stability of the lower cover cavity 6.

[0062] And by Figure 2 It can be known that the adjustment block 23 can use a bidirectional screw to control the two to move relative or opposite to each other, which belongs to the existing conventional technical means, so it will not be repeated in this case.

[0063] In one of the more preferred embodiments, an implementation method for controlling the lifting and lowering adjustment of the lifting plate 10 is provided;

[0064] A screw is rotatably installed between the top plate 2 and the cross plate 4. The screw passes through the lifting plate 10 and is threadedly connected to the penetration portion of the lifting plate 10. A servo motor for driving the screw to rotate is also installed on the top of the top plate 2.

[0065] For details, please refer to Figure 6 The screw is driven to rotate by a servo motor, and the screw and the lifting plate 10 can be driven to move up and down through the threaded cooperation between the screw and the lifting plate 10, thereby achieving the purpose of detecting different respiratory rates.

[0066] In one of the more preferred embodiments, the rotation points of the sector plate 14, the swing rod 16 and the piston cylinder 9 are all on the same vertical line, and the rotation point of the swing rod 16 is located between the other two.

[0067] In one of the more preferred embodiments, a groove is provided on the surface of the edge cover 7 for the meltblown cloth to be placed in, and the depth of the groove is less than half the thickness of the meltblown cloth.

[0068] See also Figure 5 The grooves on the surface of the side cover 7 can provide a certain limit for the placement of the meltblown cloth (i.e., the sample to be tested). At the same time, after the upper and lower cover cavities are combined, the sample to be tested can be further clamped to avoid pulling or deviation during the detection process.

[0069] In one of the more preferred embodiments, the inner wall and the outer wall of the upper cover cavity 5 and the lower cover cavity 6 are both provided with a thermal insulation layer structure, which can help to create a temperature environment in the upper and lower cover cavities.

[0070] In one of the more preferred embodiments, the bottom of the piston cylinder 9 is provided with an expansion groove for the connecting tube 20 to move, and the expansion groove is closed at the connection point between the connecting tube 20 and the inside of the piston cylinder 9.

[0071] See also Figure 5 Since the piston cylinder 9 is constantly swinging, the design of the expansion groove can provide a certain activity space for the connecting pipe 20, and the expansion groove will not be connected to the inside of the piston cylinder 9, and will not affect the suction work.

[0072] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0073] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compact fabric air permeability testing device, comprising a mounting frame, characterized in that: Also includes: A detection chamber is arranged on a mounting frame, the detection chamber comprises an upper cover chamber (5) and a lower cover chamber (6), the upper cover chamber (5) is fixed on the mounting frame, the lower cover chamber (6) is arranged below the upper cover chamber (5) and can be vertically raised and lowered, and side covers (7) for placing meltblown cloth are arranged at opposite edges of the upper cover chamber (5) and the lower cover chamber (6); a heating plate (22) is arranged in the upper cover chamber (5), and the heating plate (22) is used to create a high temperature environment in the upper cover chamber (5); a cold circulation channel (21) is arranged in the lower cover chamber (6), the cold circulation channel (21) is connected to an external circulation device, and is used to create a low temperature environment in the lower cover chamber (6), and a channel connected to the outside is arranged at the bottom of the lower cover chamber (6); A circulation unit is installed on the upper cover cavity (5), and the circulation unit performs cyclic air suction and air injection into the upper cover cavity (5), and during air injection, air containing steam is injected into the upper cover cavity (5) to simulate human breathing; A pressure sensor (8) for monitoring changes in air pressure in the upper cover cavity (5); The mounting frame comprises a bottom plate (1), a top plate (2) is fixed above the bottom plate (1) via two support columns (3), and the upper cover cavity (5) is fixedly mounted between the two support columns (3) via a fixing frame, and a transverse plate (4) is also fixed between the two support columns (3); The circulation part comprises a piston cylinder (9) rotatably mounted on the upper cover cavity (5) through a support, the inner wall of the piston cylinder (9) is slidably mounted with an integrally designed piston plate (18) and a piston rod (12), and one end of the piston rod (12) passes through the top of the piston cylinder (9), the outer wall of the cross plate (4) is rotatably connected with a swing rod (16), the top end of the piston rod (12) is rotatably connected to the outer wall of the swing rod (16) through a connecting pin (17), a spring (19) is connected between the top of the piston plate (18) and the inner top of the piston cylinder (9), the bottom of the piston cylinder (9) is connected with a connecting pipe (20) connected to the inside of the upper cover cavity (5), the outer wall of the piston cylinder (9) located below the piston plate (18) is connected with a steam inlet pipe (13), the steam inlet pipe (13) is connected to an external device for providing water vapor, and a one-way valve is also installed in the steam inlet pipe (13); The circulation part also includes a driving member for driving the swing rod (16) to swing back and forth; The driving member comprises a lifting plate (10) which is installed between two supporting columns (3) and can be raised and lowered. A long slot (11) is provided on the top of the lifting plate (10) and is penetrated therethrough. The swing rod (16) extends into the long slot (11) and is limited by notches on both sides of the long slot (11). A fan-shaped plate (14) is rotatably installed in the middle of the lifting plate (10). Both sides of the outer walls of the fan-shaped plate (14) are fixed with levers (15). The swing rod (16) is located between the two levers (15). When the fan-shaped plate (14) rotates, the lever (15) can move the swing rod (16) to swing. A driving motor for driving the fan-shaped plate (14) to rotate back and forth at a uniform speed is also installed on the outer wall of the lifting plate (10).

2. The air permeability testing device for compact woven fabrics according to claim 1, characterized in that: The top of the base plate (1) is provided with two groups of connecting rod structures which are symmetrically arranged with respect to the middle part of the lower cover cavity (6), and the connecting rod structure comprises an adjusting block (23) which is installed on the top of the base plate (1) and can be adjusted to move closer to or farther from each other, and the two adjusting blocks (23) are rotatably connected to the outer wall of the lower cover cavity (6) by connecting rods (24), and the two connecting rods (24) are arranged in a relatively oblique direction.

3. The air permeability testing device for compact woven fabrics according to claim 1, characterized in that: A screw is rotatably mounted between the top plate (2) and the cross plate (4), the screw passing through the lifting plate (10) and being threadedly connected to the through-hole of the lifting plate (10), and a servo motor for driving the screw to rotate is also mounted on the top of the top plate (2).

4. The air permeability testing device for compact woven fabrics according to claim 1, characterized in that: The rotation points of the sector plate (14), the swing rod (16) and the piston cylinder (9) are all on the same vertical line, and the rotation point of the swing rod (16) is located between the other two.

5. The air permeability testing device for compact woven fabrics according to any one of claims 1 to 4, characterized in that: The surface of the side cover (7) is provided with a groove capable of receiving the melt-blown cloth, and the depth of the groove is less than half the thickness of the melt-blown cloth.

6. The air permeability testing device for compact woven fabrics according to any one of claims 1 to 4, characterized in that: The inner walls and outer walls of the upper cover cavity (5) and the lower cover cavity (6) are both provided with a heat insulation layer structure.

7. The air permeability testing device for compact woven fabrics according to claim 1, characterized in that: The bottom of the piston cylinder (9) is provided with an expansion groove capable of allowing the connecting pipe (20) to move, and the expansion groove is closed at the connection point between the connecting pipe (20) and the inside of the piston cylinder (9).

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