Non-woven fabric air permeability detection device

Abstract

The invention relates to the technical field of air permeability testing devices, in particular to a non-woven fabric air permeability detecting device which comprises a bottom plate, a lower barrel fixedly connected to the bottom plate in a suspended mode and an upper barrel arranged above the lower barrel, an opening of the upper barrel and an opening of the lower barrel are oppositely arranged, a liftable bearing disc is arranged in the lower barrel, a vertical plate is fixedly connected to one side of the bottom plate, and the vertical plate is fixedly connected to the other side of the bottom plate. A C-shaped lifting frame is slidably connected to the vertical plate, a first linear module used for driving the lifting frame to ascend and descend is installed on the vertical plate, the upper portion of the lifting frame is fixedly connected with the upper barrel, and the lower portion of the lifting frame slidably penetrates through the side wall of the lower barrel and is fixedly connected with the bearing disc. Through cooperation of the rotating ring, the curved guide rail and the linkage mechanism, the multiple clamps synchronously move in the radial direction, multidirectional uniform drawing force can be applied when the cloth is clamped, the tension is monitored in real time in combination with the tension sensor, the stretching amount is accurately adjusted, and air permeability detection of the cloth under different stretching degrees is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air permeability testing devices, and particularly to a non-woven fabric air permeability detection device. Background Art

[0002] Due to its unique pore structure and functionality, non-woven fabrics are widely used in fields such as medical treatment, filtration, and packaging. Its air permeability is an important indicator for evaluating the material quality, reflecting the performance of the fabric in conducting and transmitting gas "particles". The air permeability of the fabric is often expressed by the air permeability rate, which refers to the amount of air passing through a unit area of the fabric per unit time under a certain pressure difference.

[0003] In actual use of non-woven fabrics, the fabric is often accompanied by different degrees of stretching, which causes changes in the pore structure of the fabric, directly affecting the air permeability of the fabric. Therefore, understanding the air permeability performance of the fabric under different tension conditions helps to evaluate its performance in actual use.

[0004] At present, most conventional air permeability detection devices adopt static testing methods, which can only measure the air permeability of the fabric without external force, and cannot simulate the real working conditions of the fabric in the stretched state, resulting in a deviation between the test results and the actual application performance. Summary of the Invention

[0005] In order to overcome the above-mentioned disadvantages of the prior art, the present invention provides a non-woven fabric air permeability detection device.

[0006] The technical solution is as follows: A non-woven fabric air permeability detection device includes a bottom plate, a lower barrel fixedly connected to the bottom plate in a suspended manner, and an upper barrel arranged above the lower barrel. The openings of the upper barrel and the lower barrel are arranged opposite to each other. A liftable bearing tray is arranged inside the lower barrel. On one side of the bottom plate, a vertical plate is fixedly connected. A U-shaped lifting frame is slidably connected to the vertical plate, and a linear module one for driving the lifting frame to lift is installed on the vertical plate. The upper part of the lifting frame is fixedly connected to the upper barrel, and the lower part of the lifting frame slidably penetrates the side wall of the lower barrel and is fixedly connected to the bearing tray. A telescopic seal sleeve is hermetically connected to the penetrating part of the lower part of the lifting frame and the lower barrel. An air inlet is opened on the outer wall of the upper barrel, and an air inlet channel communicating with the air inlet is arranged outside the upper barrel. A fan is installed in the air inlet channel. An exhaust port is opened in the middle of the bottom of the lower barrel, and a gas flow meter is arranged in the exhaust port. An installation ring is arranged on the top of the lower barrel, and a plurality of fixing plates are circumferentially arranged on the installation ring. All the fixing plates can move synchronously along the radial direction of the installation ring. A clamp is connected to each fixing plate through a linkage mechanism. The linkage mechanism is configured to convert the linear displacement of the fixing plate into the clamping or releasing action of the clamp.

[0007] Preferably, the clamp includes a first clamping plate and a second clamping plate. The second clamping plate is slidably connected to the fixing plate. A tension sensor is installed inside the fixing plate, and the measuring end of the tension sensor is connected to the second clamping plate. The first clamping plate is arranged above the second clamping plate, and the first clamping plate is connected to the fixing plate through a linkage mechanism.

[0008] Preferably, the linkage mechanism includes a rotating rod and a vertical rod. The rotating rod is rotatably connected to the top of the fixed plate. The first clamping plate is slidably connected to the rotating rod, and an elastic member is connected between the first clamping plate and the rotating rod. The vertical rod that can be lifted and lowered is slidably connected to the fixed plate. The top end of the vertical rod is movably connected to the end of the rotating rod away from the first clamping plate, so as to convert the lifting and lowering of the vertical rod into the clamping or releasing action of the first clamping plate relative to the second clamping plate through the rotating rod. A torsion spring is arranged on the rotating shaft of the rotating rod to keep the vertical rod in a downward trend.

[0009] Preferably, the mounting ring includes a fixed ring and a rotating ring. The fixed ring is fixedly connected to the top of the lower barrel. The rotating ring is rotatably connected to the bottom of the fixed ring, and there is a gap between the rotating ring and the fixed ring. A plurality of straight grooves corresponding to the positions of the fixed plates are circumferentially formed on the fixed ring. Each fixed plate is slidably connected in the grooves. A plurality of curved guide rails corresponding to the positions of the straight grooves are fixedly connected to the top of the rotating ring. The bottom end of the vertical rod extends downward into the curved guide rails. An inclined surface for guiding the vertical rod to rise is arranged at the bottom of the inner part of the curved section of the guide rails near the center of the rotating ring. When the rotating ring rotates, the curved guide rails can guide the vertical rod to drive the fixed plate to slide linearly along the grooves.

[0010] Preferably, a first bevel gear is fixedly connected to the bottom of the rotating ring, and a first motor is installed at the bottom of the fixed ring. A second bevel gear is fixedly connected to the output shaft of the first motor, and the second bevel gear meshes with the first bevel gear.

[0011] Preferably, a visible gas generator is arranged on the bottom plate. The air outlet of the visible gas generator is communicated with the air inlet channel through a trachea. The outer walls of the upper barrel and the lower barrel are both made of transparent materials.

[0012] Preferably, a lift plate that can be lifted and lowered is slidably connected in the upper barrel. A second linear module for driving the lift plate to lift and lower is installed in the upper barrel. The upper wear rod is rotatably connected to the bottom of the lift plate. The bearing tray includes two semi-circular plates with a gap between them. A U-shaped connecting frame that can be lifted and lowered is arranged in the gap between the two semi-circular plates. The lower wear rod is rotatably connected to the middle of the connecting frame. Soft iron blocks are arranged at both top ends of the connecting frame. Two electromagnets corresponding to the positions of the soft iron blocks are arranged at the bottom of the lift plate.

[0013] Preferably, a mounting plate is fixedly connected to the middle of the lower barrel. The axis of the mounting plate and the midline of the gap between the two semi-circular plates are in the same vertical plane. The measuring probe of the gas flowmeter is located in the mounting plate. Air holes communicating with the measuring probe of the gas flowmeter are opened on both sides of the mounting plate. The connecting frame is slidably connected to the upper part of the mounting plate. A second motor is installed in the mounting plate. The rotating shaft of the lower wear rod and the output shaft of the second motor are in a spline connection that can axially slide. A third motor for driving the upper wear rod to rotate is installed at the top of the lift plate.

[0014] Preferably, dust suction hoods are provided on both the lifting plate and the meniscus. The openings of the dust suction hoods on the lifting plate and the meniscus are arranged oppositely, and the dust suction hood on the lifting plate is of a telescopic structure. The dust suction hoods are all connected to the outside of the U-shaped lifting frame through dust exhaust pipes.

[0015] Preferably, a lighting lamp is installed on the inner side wall of the U-shaped lifting frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the cooperative action of the rotating ring, the curved guide rail and the linkage mechanism, the present invention enables multiple clamps to move synchronously in the radial direction, can apply multi-directional uniform tensile force when clamping the fabric, and combines a tension sensor to monitor the tension in real time, so as to accurately adjust the stretching amount and realize the air permeability detection of the fabric under different stretching degrees.

[0017] 2. By the bidirectional rotation of the upper wear rod and the lower wear rod relative to the upper and lower surfaces of the fabric, the present invention simulates the surface damage of the fabric in actual use, and combines a dust suction hood to timely remove dust chips to ensure the accuracy of the air permeability test after wear.

[0018] 3. Through the cooperation of the transparent barrel and the visible gas generator, the present invention can visually observe the process of gas penetrating the fabric. The setting of the lighting lamp further optimizes the observation environment and ensures that the detection details can still be observed under low light conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic three-dimensional structure diagram of the present invention.

[0020] Figure 2 is a schematic cross-sectional view of the three-dimensional structure of the present invention.

[0021] Figure 3 is an exploded view of the three-dimensional structure of the present invention.

[0022] Figure 4 is a schematic cross-sectional view of the three-dimensional structure of the mounting ring of the present invention.

[0023] Figure 5 is a schematic installation structure diagram of the first bevel gear, the first motor and the second bevel gear of the present invention.

[0024] Figure 6 is a schematic three-dimensional structure diagram of the clamp of the present invention.

[0025] Figure 7 is a schematic installation structure diagram of the linkage mechanism of the present invention.

[0026] Figure 8 is a schematic cross-sectional view of the installation structure of the dust suction hood of the present invention.

[0027] Figure 9 is a schematic cross-sectional view of the installation structure of the lifting plate of the present invention.

[0028] Figure 10 This is a cross-sectional view of the installation structure of the upper wear rod and the lower wear rod of the present invention.

[0029] Figure 11 This is an exploded view of the lower wear rod, the connecting frame and the second motor of the present invention.

[0030] Description of reference numerals: 101 - bottom plate, 102 - vertical plate, 2 - upper barrel, 3 - lower barrel, 4 - supporting tray, 401 - meniscus, 5 - lifting frame, 6 - linear module one, 7 - sealing sleeve, 8 - air inlet channel, 9 - fan, 10 - gas flowmeter, 11 - mounting ring, 1101 - fixing ring, 1102 - rotating ring, 1103 - sliding groove, 1104 - curved guide rail, 1105 - inclined surface, 12 - fixing plate, 13 - fixture, 1301 - clamping plate one, 1302 - clamping plate two, 1303 - tension sensor, 1304 - elastic member, 14 - linkage mechanism, 1401 - rotating rod, 1402 - vertical rod, 1403 - torsion spring, 1501 - bevel gear one, 1502 - first motor, 1503 - bevel gear two, 16 - visible gas generator, 17 - lifting plate, 18 - linear module two, 19 - upper wear rod, 20 - connecting frame, 21 - lower wear rod, 22 - soft iron block, 23 - electromagnet, 24 - mounting plate, 25 - second motor, 26 - third motor, 27 - dust suction hood, 28 - dust exhaust pipe, 29 - lighting lamp. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] A non-woven fabric air permeability detection device provided by an embodiment is as Figures 1 - 11As shown in the figure, it includes a bottom plate 101, a lower barrel 3 and an upper barrel 2. The lower barrel 3 is suspended and fixedly connected to the bottom plate 101 through a support. The upper barrel 2 is arranged above the lower barrel 3, and the openings of the upper barrel 2 and the lower barrel 3 are arranged oppositely. A liftable bearing tray 4 is arranged inside the lower barrel 3, and the bearing tray 4 is used to temporarily support the fabric to be detected. On one side of the bottom plate 101, a vertical plate 102 is fixedly connected. A lift frame 5 with a U-shaped structure is slidably connected to the vertical plate 102, and a linear module one 6 for driving the lift frame 5 to lift is installed on the vertical plate 102. In this embodiment, the linear module one 6 adopts a screw linear module. The lift frame 5 is threadedly connected to the screw of the linear module one 6. The upper part of the lift frame 5 is fixedly connected to the upper barrel 2, and the lower part of the lift frame 5 slidably penetrates the side wall of the lower barrel 3 and is fixedly connected to the bearing tray 4. By driving the lift frame 5 to lift through the linear module one 6, the synchronous lifting of the upper barrel 2 and the bearing tray 4 can be realized, so as to form or release a sealed detection cavity. A bellows-type telescopic seal sleeve 7 is hermetically connected to the penetrating part of the lower part of the lift frame 5 and the lower barrel 3, ensuring that the internal space of the lower barrel 3 and the external space can maintain air pressure isolation during the lifting process of the lift frame 5, preventing air leakage from affecting the detection result. An air inlet is opened on the outer wall of the upper barrel 2, and an air inlet duct 8 communicated with the air inlet is arranged outside the upper barrel 2. A fan 9 is installed in the air inlet duct 8. An exhaust port is opened in the middle of the bottom of the lower barrel 3, and a gas flow meter 10 is arranged in the exhaust port. In this embodiment, the gas flow meter 10 is electrically connected to an external control system. The gas flow meter 10 is used to measure the flow rate of the gas discharged through the exhaust port of the lower barrel 3 and feedback it to the external control system for analysis and calculation of the air permeability of the fabric, providing data support for material quality evaluation. An installation ring 11 is arranged at the top of the lower barrel 3, and a plurality of fixing plates 12 are circumferentially arranged on the installation ring 11. All the fixing plates 12 can move synchronously along the radial direction of the installation ring 11. A clamp 13 is connected to each fixing plate 12 through a linkage mechanism 14. The linkage mechanism 14 is configured to convert the linear displacement of the fixing plate 12 into the clamping or releasing action of the clamp 13.

[0033] In the embodiment, the clamp 13 includes a first clamping plate 1301 and a second clamping plate 1302. The second clamping plate 1302 is slidably connected to the fixing plate 12. A tension sensor 1303 is installed in the fixing plate 12, and the measuring end of the tension sensor 1303 is connected to the second clamping plate 1302. The first clamping plate 1301 is arranged above the second clamping plate 1302, and the first clamping plate 1301 is connected to the fixing plate 12 through the linkage mechanism 14. In this embodiment, the tension sensor 1303 is electrically connected to an external control system. The tension sensor 1303 feeds back to the external control system by real-time monitoring the tensile tension of the clamp 13 on the fabric.

[0034] In the embodiment, the linkage mechanism 14 includes a rotating rod 1401 and a vertical rod 1402. The rotating rod 1401 is rotatably connected to the top of the fixed plate 12. The first clamping plate 1301 is slidably connected to the rotating rod 1401, and an elastic member 1304 is connected between the first clamping plate 1301 and the rotating rod 1401. The vertical rod 1402 is slidably connected to the fixed plate 12 and can be lifted and lowered. The top end of the vertical rod 1402 is movably connected to one end of the rotating rod 1401 away from the first clamping plate 1301, so as to convert the lifting and lowering of the vertical rod 1402 into the clamping or releasing action of the first clamping plate 1301 relative to the second clamping plate 1302 through the rotating rod 1401. A torsion spring 1403 is arranged on the rotating shaft of the rotating rod 1401, so that the vertical rod 1402 maintains a downward trend, and thus when there is no external force, the clamp 13 can automatically release the fabric.

[0035] In the embodiment, the mounting ring 11 includes a fixed ring 1101 and a rotating ring 1102. The fixed ring 1101 is fixedly connected to the top of the lower barrel 3. The rotating ring 1102 is rotatably connected to the bottom of the fixed ring 1101, and there is a gap between the rotating ring 1102 and the fixed ring 1101. A plurality of straight grooves 1103 corresponding to the positions of the fixed plates 12 are circumferentially formed on the fixed ring 1101. Each fixed plate 12 is slidably connected in the groove 1103. A plurality of curved guide rails 1104 corresponding to the positions of the straight grooves 1103 are fixedly connected to the top of the rotating ring 1102. The bottom end of the vertical rod 1402 extends downward into the curved guide rail 1104. An inclined surface 1105 for guiding the vertical rod 1402 to rise is arranged at the bottom of the inner bottom of the curved section of the guide rail near the center of the rotating ring 1102. When the rotating ring 1102 rotates, the curved guide rail 1104 can guide the vertical rod 1402 to drive the fixed plate 12 to linearly slide along the groove 1103.

[0036] In the embodiment, a first bevel gear 1501 is fixedly connected to the bottom of the rotating ring 1102. A first motor 1502 is installed at the bottom of the fixed ring 1101. A second bevel gear 1503 is fixedly connected to the output shaft of the first motor 1502. The second bevel gear 1503 meshes with the first bevel gear 1501. When the first motor 1502 is started, through the meshing action of the second bevel gear 1503 and the first bevel gear 1501, the rotating ring 1102 can be driven to rotate, and then the vertical rod 1402 can be guided to rise and fall through the curved guide rail 1104, so as to realize the synchronous clamping or releasing action of the clamp 13. This design can ensure that a plurality of clamps 13 apply multi-directional uniform tensile forces when clamping the fabric, improving the accuracy of detection.

[0037] In the embodiment, a visual gas generator 16 is arranged on the bottom plate 101. The air outlet of the visual gas generator 16 is connected to the air inlet channel 8 through a trachea. When visual inspection is required, the visual gas generator 16 can produce visual gas and transport it into the air inlet channel 8. The outer walls of the upper barrel 2 and the lower barrel 3 are both made of transparent materials to directly view the air permeability of the fabric in the seal detection chamber.

[0038] In the embodiment, a liftable lifting plate 17 is slidably connected in the upper barrel 2, and a linear module two 18 for driving the lifting of the lifting plate 17 is installed in the upper barrel 2. In this embodiment, the linear module two 18 adopts a screw linear module. The lifting plate 17 is threadedly connected to the screw of the linear module one 6. A top wear rod 19 is rotatably connected to the bottom of the lifting plate 17 for wearing the upper surface of the fabric. The supporting tray 4 includes two semi-circular plates 401 with a gap therebetween. A liftable U-shaped connecting frame 20 is arranged in the gap between the two semi-circular plates 401. A bottom wear rod 21 is rotatably connected to the middle of the connecting frame 20 for wearing the lower surface of the fabric. Soft iron blocks 22 are arranged at both top ends of the connecting frame 20, and two electromagnets 23 corresponding to the positions of the soft iron blocks 22 are arranged at the bottom of the lifting plate 17. When the lifting plate 17 descends until the top wear rod 19 contacts the upper surface of the fabric, the distance between the electromagnet 23 and the soft iron block 22 reaches the minimum value. At this time, when the electromagnet 23 is energized, the electromagnet 23 can attract the soft iron block 22 to drive the connecting frame 20 to rise, so that the bottom wear rod 21 contacts the lower surface of the fabric. After power-off, the connecting frame 20 descends and resets under the action of its own gravity.

[0039] In the embodiment, a mounting plate 24 is fixedly connected to the middle of the lower barrel 3. The axis of the mounting plate 24 and the midline of the gap between the two semi-circular plates 401 are in the same vertical plane. The measuring probe of the gas flow meter 10 is located in the mounting plate 24. Air holes communicating with the measuring probe of the gas flow meter 10 are opened on both sides of the mounting plate 24. The connecting frame 20 is slidably connected to the upper part of the mounting plate 24. The top of the mounting plate 24 is made of a magnetically conductive material. A motor two 25 is installed in the mounting plate 24. The rotating shaft of the bottom wear rod 21 and the output shaft of the motor two 25 are in a spline connection that can axially slide. Specifically, a spline groove extending axially is arranged on the outer peripheral surface of the output shaft of the motor two 25, and spline teeth matching the spline groove are correspondingly arranged on the inner hole wall of the rotating shaft of the bottom wear rod 21. This spline connection structure enables the rotating shaft of the bottom wear rod 21 to slide along the axial direction of the output shaft of the motor two 25. At the same time, when the output shaft of the motor two 25 rotates, torque is transmitted to the rotating shaft of the bottom wear rod 21 through the engagement of the spline groove and the spline teeth, thereby driving the rotating shaft of the bottom wear rod 21 to rotate synchronously. A motor three 26 for driving the top wear rod 19 to rotate is installed at the top of the lifting plate 17. In this embodiment, when the motor two 25 and the motor three 26 work, the rotation directions of their output shafts are opposite.

[0040] In the embodiment, dust suction covers 27 are communicated with both the lifting plate 17 and the semi-circular plates 401. The dust suction cover 27 on the lifting plate 17 is of a telescopic structure to adapt to the height change when the lifting plate 17 rises and falls. The openings of the dust suction covers 27 on the lifting plate 17 and the semi-circular plates 401 are arranged oppositely. The dust suction covers 27 are all communicated to the outside of the U-shaped lifting frame 5 through dust exhaust pipes 28. During the fabric wear detection process, the dust suction covers 27 can timely suck the generated dust debris to prevent the dust debris from affecting the air permeability detection result.

[0041] In the embodiment, a lighting lamp 29 is installed on one side of the U-shaped lifting frame 5 facing away from the vertical plate 102, for enhancing the brightness of the detection environment.

[0042] The working process of the present invention: When it is necessary to detect the air permeability of the fabric after stretching, the fabric to be detected is cut into a circular shape and placed on the bearing tray 4 and on the second clamping plates 1302 of each clamp 13. The motor one 1502 drives the bevel gear two 1503 to rotate. Under the meshing transmission of the bevel gear two 1503 and the bevel gear one 1501, the rotating ring 1102 rotates relative to the fixed ring 1101, so that the curved guide rail on the rotating ring 1102 moves relative to the vertical rod 1402. Furthermore, the vertical rod 1402 is pushed by the inclined surface 1105 of the curved guide rail to rise, forcing the rotating rod 1401 to rotate against the elastic force of the torsion spring 1403, so that the first clamping plate 1301 performs a clamping movement towards the second clamping plate 1302 to clamp the fabric. At the same time, the curved guide rail guides the vertical rod 1402 to drive the fixed plate 12 to perform a linear movement away from the center of the fixed ring 1101 along the sliding groove 1103, so that the fixed plate 12 drives the first clamping plate 1301 and the second clamping plate 1302 to stretch the fabric while clamping the fabric. Under the synchronous stretching of multiple clamps 13, multi-directional and uniform stretching can be applied to the fabric, so as to facilitate the test of the air permeability of the fabric after stretching. In addition, the stretching tension of the fabric is monitored in real time through the tension sensor 1303, and the external control system is fed back to adjust the operating state of the motor one 1502 to reach the preset stretching amount, so as to facilitate the detection of the air permeability of the fabric at different stretching degrees. Then, the linear module one 6 drives the lifting frame 5 to vertically descend along the vertical plate 102, and the lifting frame 5 drives the upper barrel 2 and the bearing tray 4 to descend together, so that the opening end faces of the upper barrel 2 and the lower barrel 3 are pressed against each other to form a sealed detection cavity. At the same time, the bearing tray 4 descends to the lower part inside the lower barrel 3, keeping the fabric independent between the openings of the upper barrel 2 and the lower barrel 3. During this process, the telescopic sealing sleeve 7 can ensure the relative movement between the lower part of the lifting frame 5 and the side wall of the lower barrel 3, while ensuring the air pressure isolation between the internal space of the lower barrel 3 and the external space. Subsequently, through the operation of the blower 9, external gas is injected into the upper barrel 2 through the air inlet duct 8. As the air pressure in the upper barrel 2 increases, part of the gas can enter the lower barrel 3 through the pores of the fabric due to the pressure difference, and finally is discharged through the measuring probe and the exhaust port of the gas flow meter 10. The gas flow meter 10 can measure the movement properties of the discharged gas for subsequent calculation and analysis of the air permeability of the fabric.

[0043] When it is necessary to visualize the air permeability detection process, the connection between the external gas and the air inlet duct 8 is disconnected, and visible gas is generated by the visible gas generator 16. The visible gas is used as the gas source and transported to the air inlet duct 8. Then, the above air permeability detection process is repeated. The difference in the detection process at this time is that the outer walls of the upper barrel 2 and the lower barrel 3 are made of transparent materials, enabling the process of visible gas passing through the fabric to be clearly observed, thereby visualizing the entire detection process. In addition, when the light is insufficient, the ambient brightness can be enhanced by the lighting lamp 29 to improve the observation effect.

[0044] When it is necessary to detect the air permeability of the fabric after wear, the lifting plate 17 is driven by the linear module two 18 to descend until the upper wear rod 19 contacts the upper surface of the fabric. Then, the electromagnet 23 is energized, causing the electromagnet 23 to attract the soft iron block 22 of the connecting frame 20 below, so that the connecting frame 20 drives the lower wear rod 21 to move upward until it contacts the lower surface of the fabric. Subsequently, the lower wear rod 21 and the upper wear rod 19 are driven to rotate in opposite directions by the motor two 25 and the motor three 26 respectively, so that the upper wear rod 19 wears the upper surface of the fabric, and the lower wear rod 21 wears the lower surface of the fabric to simulate the actual wear condition of the fabric. After the wear is completed, the electromagnet 23 is de-energized, and the connecting frame 20 drives the lower wear rod 21 to descend and reset under the action of its own gravity. The linear module two 18 drives the lifting plate 17 to drive the upper wear rod 19 to move in the reverse direction and reset. Then, the above air permeability detection process is repeated. The difference in this detection process is that both the upper and lower surfaces of the fabric have been worn, and the obtained air permeability detection is the air permeability after wear. This result can be used to compare with the air permeability of the fabric before wear. In addition, by connecting the external negative pressure device to the dust exhaust pipe 28 of the dust suction hood 27, the dust generated during the fabric wear process can be sucked to avoid the influence of these dusts on the air permeability detection result of the fabric.

[0045] The above are only examples of the present invention and are not used to limit the present invention. All equivalent replacements made within the principle of the present invention shall be included within the protection scope of the present invention. The content not elaborated in detail in the present invention belongs to the prior art well-known to those skilled in the art.

Claims

1. A non-woven fabric air permeability detection device, characterized in that: It includes a bottom plate (101), a lower barrel (3) fixedly connected to the bottom plate (101) in a suspended manner, and an upper barrel (2) arranged above the lower barrel (3). The openings of the upper barrel (2) and the lower barrel (3) are arranged opposite to each other. A liftable bearing tray (4) is arranged inside the lower barrel (3). On one side of the bottom plate (101), a vertical plate (102) is fixedly connected. A U-shaped lifting frame (5) is slidably connected to the vertical plate (102), and a linear module one (6) for driving the lifting frame (5) to lift is installed on the vertical plate (102). The upper part of the lifting frame (5) is fixedly connected to the upper barrel (2), and the lower part of the lifting frame (5) slidably penetrates the side wall of the lower barrel (3) and is fixedly connected to the bearing tray (4). A telescopic sealing sleeve (7) is hermetically connected to the penetrating part of the lower part of the lifting frame (5) and the lower barrel (3). An air inlet is opened on the outer wall of the upper barrel (2), and an air inlet duct (8) communicated with the air inlet is arranged outside the upper barrel (2). A fan (9) is installed in the air inlet duct (8). An exhaust port is opened in the middle of the bottom of the lower barrel (3), and a gas flow meter (10) is arranged in the exhaust port. An installation ring (11) is arranged at the top of the lower barrel (3), and a plurality of fixing plates (12) are circumferentially arranged on the installation ring (11). All the fixing plates (12) can move synchronously along the radial direction of the installation ring (11). A clamp (13) is connected to each fixing plate (12) through a linkage mechanism (14). The linkage mechanism (14) is configured to convert the linear displacement of the fixing plate (12) into the clamping or releasing action of the clamp (13).

2. The non-woven fabric air permeability detection device according to claim 1, characterized in that: The clamp (13) includes a first clamping plate (1301) and a second clamping plate (1302). The second clamping plate (1302) is slidably connected to the fixing plate (12). A tension sensor (1303) is installed in the fixing plate (12). The measuring end of the tension sensor (1303) is connected to the second clamping plate (1302). The first clamping plate (1301) is arranged above the second clamping plate (1302), and the first clamping plate (1301) is connected to the fixing plate (12) through a linkage mechanism (14).

3. The nonwoven fabric air permeability detection device according to claim 2, characterized in that: The linkage mechanism (14) includes a rotating rod (1401) and a vertical rod (1402). The top of the fixing plate (12) is rotatably connected to the rotating rod (1401). The first clamping plate (1301) is slidably connected to the rotating rod (1401), and an elastic member (1304) is connected between the first clamping plate (1301) and the rotating rod (1401). A liftable vertical rod (1402) is slidably connected to the fixing plate (12). The top end of the vertical rod (1402) is movably connected to the end of the rotating rod (1401) away from the first clamping plate (1301), so as to convert the lifting of the vertical rod (1402) into the clamping or releasing action of the first clamping plate (1301) relative to the second clamping plate (1302) through the rotating rod (1401). A torsion spring (1403) is arranged on the rotating shaft of the rotating rod (1401) to keep the vertical rod (1402) in a descending trend.

4. The nonwoven fabric air permeability detection device according to claim 3, wherein: The mounting ring (11) includes a fixed ring (1101) and a rotating ring (1102). The fixed ring (1101) is fixedly connected to the top of the lower barrel (3). The rotating ring (1102) is rotatably connected to the bottom of the fixed ring (1101), and there is a gap between the rotating ring (1102) and the fixed ring (1101). A plurality of straight grooves (1103) corresponding to the positions of the fixing plates (12) are circumferentially formed on the fixed ring (1101). Each fixing plate (12) is slidably connected within the groove (1103). A plurality of curved guide rails (1104) corresponding to the positions of the straight grooves (1103) are fixedly connected to the top of the rotating ring (1102). The bottom end of the vertical rod (1402) extends downward into the curved guide rail (1104). An inclined surface (1105) for guiding the vertical rod (1402) to rise is provided at the inner bottom of the curved section of the guide rail near the center of the rotating ring (1102). When the rotating ring (1102) rotates, the curved guide rail (1104) can guide the vertical rod (1402) to drive the fixing plate (12) to linearly slide along the groove (1103).

5. The nonwoven fabric air permeability detection device according to claim 4, characterized in that: A first bevel gear (1501) is fixedly connected to the bottom of the rotating ring (1102). A first motor (1502) is installed at the bottom of the fixed ring (1101). A second bevel gear (1503) is fixedly connected to the output shaft of the first motor (1502). The second bevel gear (1503) meshes with the first bevel gear (1501).

6. The non-woven fabric air permeability detection device according to claim 5, characterized in that: A visible gas generator (16) is provided on the bottom plate (101). The gas outlet of the visible gas generator (16) is communicated with the intake passage (8) through a gas pipe. The outer walls of the upper barrel (2) and the lower barrel (3) are both made of transparent materials.

7. An apparatus for detecting the air permeability of a nonwoven fabric according to claim 6, characterized in that: A liftable lifting plate (17) is slidably connected within the upper barrel (2). A second linear module (18) for driving the lifting plate (17) to lift is installed within the upper barrel (2). The bottom of the lifting plate (17) is rotatably connected to an upper wear rod (19). The bearing tray (4) includes two semi-circular plates (401) with a gap therebetween. A liftable U-shaped connecting frame (20) is arranged within the gap between the two semi-circular plates (401). The middle part of the connecting frame (20) is rotatably connected to a lower wear rod (21). Soft iron blocks (22) are provided at both top ends of the connecting frame (20). Two electromagnets (23) corresponding to the positions of the soft iron blocks (22) are provided at the bottom of the lifting plate (17).

8. The nonwoven fabric air permeability detection device according to claim 7, wherein: A mounting plate (24) is fixedly connected to the middle part within the lower barrel (3). The axis of the mounting plate (24) and the midline of the gap between the two semi-circular plates (401) are in the same vertical plane. The measuring probe of the gas flow meter (10) is located within the mounting plate (24). Air holes communicating with the measuring probe of the gas flow meter (10) are formed on both sides of the mounting plate (24). The connecting frame (20) is slidably connected to the upper part within the mounting plate (24). A second motor (25) is installed within the mounting plate (24). The rotating shaft of the lower wear rod (21) and the output shaft of the second motor (25) are in a spline connection that allows axial sliding. A third motor (26) for driving the upper wear rod (19) to rotate is installed at the top of the lifting plate (17).

9. The nonwoven fabric air permeability detection device according to claim 8, characterized in that: Dust suction hoods (27) are provided on both the lifting plate (17) and the meniscus (401). The openings of the dust suction hoods (27) on the lifting plate (17) and the meniscus (401) are arranged oppositely, and the dust suction hood (27) on the lifting plate (17) is of a telescopic structure. The dust suction hoods (27) are all connected to the outside of the U-shaped lifting frame (5) through dust exhaust pipes (28).

10. The non-woven fabric air permeability detection device according to claim 9, characterized in that: A lighting lamp (29) is installed on the inner side wall of the U-shaped lifting frame (5).

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