Breathable volume testing device for breathable film

Abstract

The invention provides a breathable film air permeability testing device which comprises a base, connecting seats are fixedly connected to the two ends of the base, stand columns are fixedly connected to the four ends of the upper portion of the base, a top plate is fixedly connected to the tops of the stand columns, first lead screws are rotationally connected to the two ends of the lower portion of the top plate, and movable plates are in threaded connection to the first lead screws; the winding rollers are arranged at the two ends of the lower cylinder, so that the breathable film can be wound and tightened, and the situations that the air film possibly forms wrinkles or local deformation in a loose state, so that the air passing path is not uniform, the test result is possibly high, and the real air permeability cannot be reflected are prevented; meanwhile, ventilation and waterproof performance tests are integrated, the test efficiency can be improved, equipment replacement or sample re-clamping is not needed, two key performance tests are completed at a time, time and labor cost are saved, and the device is suitable for research and development iteration or production line quality inspection, product optimization acceleration and qualification judgment.

Description

Technical Field

[0001] This invention relates to the field of breathable membrane testing technology, specifically to a device for testing the air permeability of a breathable membrane. Background Technology

[0002] With the development of society, the application of breathable membranes is becoming more and more widespread. Breathable membranes, also known as waterproof and breathable microporous membranes, are characterized by being breathable but not water-permeable. Their pores are so small that water droplets cannot pass through, but water vapor molecules can, thus achieving the effect of being waterproof and breathable. In the production process, the air permeability test is an important step. Breathable membranes that do not meet the standards cannot achieve the desired effect. Existing breathability tests (such as ASTM D737 and ISO 9237) typically use clamps to hold the membrane material, but lack a tension control mechanism, leading to membrane loosening and wrinkling, which affects test results. Loose membranes result in uneven airflow distribution, with some areas having higher breathability and others lower. Wrinkles may clog micropores, causing breathability test values ​​to be lower than the actual situation. The existing patent "CN110044800A Breathability Testing Device" uses ordinary clamps to fix the membrane material without tension adjustment, relying solely on clamping force for fixation, which can easily lead to membrane deformation. In addition, in existing technologies, breathability and waterproofing tests usually use different equipment, which requires re-clamping the breathable membrane, adjusting parameters, and conducting waterproofing tests, resulting in cumbersome operation and long testing cycles. Furthermore, repeated clamping of samples may damage the membrane material (such as tensile deformation and pinhole enlargement). The existing patent example "CN110044800A" only involves breathability testing and does not integrate waterproofing testing functions. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a breathable membrane air permeability testing device, which solves the problems of existing breathable membrane testing devices using clamps to hold the membrane material but lacking a tension control mechanism, resulting in membrane material loosening and wrinkling, affecting test results, and the fact that breathability testing and waterproof testing usually use different equipment, leading to cumbersome operation and long testing cycles.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a breathable membrane air permeability testing device, comprising a base, connecting seats fixedly connected to both ends of the base, columns fixedly connected to the four ends of the upper part of the base, a top plate fixedly connected to the top of the columns, a lead screw rotatably connected to both ends of the lower part of the top plate, a movable plate threaded onto the lead screw, a motor fixedly connected to both ends of the upper part of the top plate, the output end of the motor fixedly connected to the lead screw, an upper cylinder fixedly connected to the inner end of the movable plate, a lower cylinder fixedly connected to the upper middle part of the base, and sealing rings fixedly connected to the inner ends of both the upper and lower cylinders, and an opening in the upper middle part of the top plate; Mounting brackets are fixedly connected to the upper two ends of the movable plate, and mounting plates are fixedly connected to the top of the mounting brackets. A pressure sensor is fixedly connected to the inner middle of the mounting plate. A movable rod is movably connected inside the upper cylinder. The movable rod is slidably connected to the mounting bracket, and a limit plate is fixedly connected to the top of the movable rod. The limit plate corresponds to the pressure sensor. The base has connecting frames at both ends. A take-up roller is rotatably connected inside the connecting frames. A fixing frame is fixedly connected to both ends of the outer side of the take-up roller. A screw is threaded to both ends of the fixing frame. An arc-shaped plate is rotatably connected to the lower end of the screw. A gear is fixedly connected to the rotating end of the take-up roller. A sliding groove is opened at both ends of the outer side of the connecting frame. A sliding rod is fixedly connected inside the sliding groove. A slider is slidably connected to the sliding rod. A gear is fixedly connected to the outer end of the slider. Gear 1 and gear 2 mesh with each other. A drain pipe is provided through the bottom of the lower cylinder.

[0005] Preferably, the rotating end of the take-up roller is fixedly connected to a handle, and the outer end of the slide rod is fitted with a spring.

[0006] Preferably, one end of the spring is fixedly connected to the bottom of the groove, and the other end is fixedly connected to the slider.

[0007] Preferably, an air pump is fixedly connected to the connecting seat on the left side, with an air inlet pipe extending through one end of the air pump and the other end of the air inlet pipe extending through the interior of the lower cylinder.

[0008] Preferably, a second motor is fixedly connected to the outer end of the connecting seat on the right side, and a slot is provided on the connecting seat on the right side. A second lead screw is rotatably connected inside the slot, and the output end of the second motor is fixedly connected to the second lead screw.

[0009] Preferably, a threaded block is threaded onto the second lead screw, a movable frame is fixedly connected to the top of the threaded block, and a cylinder is fixedly connected to the outer end of the movable frame.

[0010] Preferably, the extended end of the cylinder is fixedly connected to a water spray frame through the movable frame, and a water tank is provided on one side of the connecting seat on the right side.

[0011] Preferably, a water pipe is installed through the upper end of the water tank, a water pump is installed in the middle of the water pipe, the other end of the water pipe is installed inside the water spray frame, and several nozzles are provided at the lower end of the water spray frame.

[0012] Working principle: During use, the operator lays the breathable membrane flat on the lower cylinder 8 and winds both ends of the breathable membrane onto the take-up roller 18. Rotating the screw 29 drives the arc plate 28 to move downwards, which positions the two ends of the breathable membrane. Then, the second gear 31 is pulled down, disengaging it from the first gear 30. The handle 19 is then turned to rotate the take-up roller 18, winding up the two ends of the breathable membrane and keeping it taut for testing. After winding, the second gear 31 is released, and the spring 34 causes the slider 33 to reset the second gear 31, engaging it with the first gear 30 to lock it in place, ensuring the stability and tautness of the breathable membrane during testing. Then, the motor 12 is started to drive the lead screw 16 to rotate. Under the action of the threaded connection, the movable plate 15 can drive the upper cylinder 10 to move downward, so that the upper cylinder 10 can close with the lower cylinder 8, clamping the breathable membrane in the middle of the two cylinders. At the same time, the sealing ring at the inner end can improve its sealing effect. When performing an airtightness test, the solenoid valve on the air inlet pipe 23 is opened and the air pump 40 is started to send air into the interior of the lower cylinder 8 through the air inlet pipe 23. As the air is injected into the lower cylinder 8, it can cause the breathable membrane to bulge, which can push the movable rod 26 inside the upper cylinder 10 upward. During the pushing process, the movable rod 26 can make the limit plate 38 contact with the pressure sensor 37. The air permeability of the breathable membrane is detected by the value of the pressure sensor 37. After the air permeability test is completed, the upper cylinder 10 moves upward, and the second motor 41 starts to drive the second lead screw 21 to rotate. Under the action of the threaded connection, the threaded block 22 can drive the movable frame 3 to move, thereby moving the water spray assembly above the lower cylinder 8. The position of the water spray assembly can be adjusted by the cylinder 4. After the adjustment is completed, the water pump 6 is started to draw water from the water tank 5 into the interior of the water spray frame 24 through the water pipe 7, and spray it downward through the nozzle 25 to contact the water permeable membrane. The permeated water can enter the interior of the lower cylinder 8, and the solenoid valve inside the drain pipe 13 can be opened to drain the permeated water into the container, thereby observing the amount of permeation to test the waterproof effect of the air permeable membrane, thus completing the entire air permeability and waterproof test.

[0013] (III) Beneficial Effects This invention provides a device for testing the air permeability of a breathable membrane. It has the following beneficial effects: This invention utilizes take-up rollers at both ends of the lower cylinder to tighten and wind up the breathable membrane, preventing wrinkles or localized deformation that could occur when the membrane is loose. This would lead to uneven airflow paths and potentially inflated test results, failing to reflect true breathability. Furthermore, this invention integrates breathability and waterproof performance testing, improving testing efficiency and eliminating the need to change equipment or re-clamp samples. It completes two key performance tests in one go, saving time and labor costs. This invention is suitable for R&D iterations or production line quality inspection, accelerating product optimization and qualification determination. Attached Figure Description

[0014] Figure 1 This is a front view of an air permeability testing device for an air permeable membrane proposed in this invention; Figure 2 This is a side view of an air permeability testing device for an air permeable membrane proposed in this invention; Figure 3 This is a schematic diagram of the winding assembly of an air permeability testing device for an air permeability membrane proposed in this invention; Figure 4 This is a schematic diagram of the gear structure of the air permeability testing device for an air permeable membrane proposed in this invention; Figure 5 This is a schematic diagram of the upper cylinder structure of an air permeability testing device for an air permeability membrane proposed in this invention; Figure 6 This is a schematic diagram of the lower cylinder structure of an air permeability testing device for an air permeability membrane proposed in this invention.

[0015] The components are as follows: 1. Base; 2. Connecting seat; 3. Movable frame; 4. Cylinder; 5. Water tank; 6. Water pump; 7. Water pipe; 8. Lower cylinder; 9. Top plate; 10. Upper cylinder; 11. Opening; 12. Motor 1; 13. Drain pipe; 14. Column; 15. Movable plate; 16. Lead screw 1; 17. Connecting frame; 18. Take-up roller; 19. Handle; 20. Slot; 21. Lead screw 2; 22. Threaded block; 23. Air inlet pipe; 24. Spray frame; 25. Nozzle; 26. Movable rod; 27. Fixed frame; 28. Arc plate; 29. ​​Screw; 30. Gear 1; 31. Gear 2; 32. Slide groove; 33. Slider; 34. Spring; 35. Slide rod; 36. Mounting plate; 37. Pressure sensor; 38. Limiting plate; 39. Mounting frame; 40. Air pump; 41. Motor 2. Detailed Implementation

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

[0017] Example: like Figure 1-6 As shown, this embodiment of the invention provides a breathable membrane air permeability testing device, including a base 1, connecting seats 2 fixedly connected to both ends of the base 1, columns 14 fixedly connected to the four ends of the upper part of the base 1, a top plate 9 fixedly connected to the top of the columns 14, lead screws 16 rotatably connected to the lower ends of the top plate 9, a movable plate 15 threadedly connected to the lead screws 16, a motor 12 fixedly connected to the upper ends of the top plate 9, the output end of the motor 12 fixedly connected to the lead screws 16, an upper cylinder 10 fixedly connected to the inner end of the movable plate 15, a lower cylinder 8 fixedly connected to the upper middle part of the base 1, and sealing rings fixedly connected to the inner ends of both the upper and lower cylinders 10, an opening 11 opened in the upper middle part of the top plate 9, and the two sets of lead screws 16 inside can be rotated by starting the motor 12. The two lead screws 16 are selected from the same manufacturer and the same production batch to ensure that the materials, heat treatment process and initial accuracy are consistent, and the pitch error is ≤ ±0.005mm, and the cumulative lead error is ≤ ±0.02mm / 300mm, the diameter and thread profile need to be tested for consistency by an optical projector, so that the movable plate 15 can be driven to move up and down under the action of the threaded connection, so that the upper cylinder 10 and the lower cylinder 8 correspond to each other, and the breathable membrane is clamped in the middle of the two cylinders. The sealing ring installed inside can better improve the sealing effect of the two cylinders after clamping, and prevent air leakage from affecting the breathability test results. Mounting brackets 39 are fixedly connected to the upper two ends of the movable plate 15. Mounting plate 36 is fixedly connected to the top of mounting bracket 39. Pressure sensor 37 is fixedly connected to the inner middle of mounting plate 36. Movable rod 26 is movably connected inside the upper cylinder 8. Movable rod 26 is slidably connected to mounting bracket 39. Limiting plate 38 is fixedly connected to the top of movable rod 26. Limiting plate 38 corresponds to pressure sensor 37. When the solenoid valve on air inlet pipe 23 is opened and air pump 40 is started, air can be sent into the interior of lower cylinder 8 through air inlet pipe 23. As air is injected into the interior of lower cylinder 8, the breathable membrane can be inflated, which can push the movable rod 26 inside upper cylinder 10 upward. During the pushing process, movable rod 26 can make limiting plate 38 contact with pressure sensor 37. The breathability of breathable membrane is detected by the value of pressure sensor 37. At the same time, pressure sensor 37 is electrically connected to controller and display screen, so that the pressure monitoring results can be transmitted to the display screen for easy observation and recording by staff. Connecting frames 17 are provided at both ends of the upper part of the base 1. A take-up roller 18 is rotatably connected inside the connecting frame 17. A fixing frame 27 is fixedly connected to both ends of the outer side of the take-up roller 18. A screw 29 is threadedly connected to both ends of the upper part of the fixing frame 27. An arc plate 28 is rotatably connected to the lower end of the screw 29. A gear 30 is fixedly connected to the rotating end of the take-up roller 18. A sliding groove 32 is provided at both ends of the outer side of the connecting frame 17. A sliding rod 35 is fixedly connected inside the sliding groove 32. A slider 33 is slidably connected to the sliding rod 35. A gear 31 is fixedly connected to the outer end of the slider 33. Gear 30 and gear 31 mesh with each other. A drain pipe 13 is provided through the bottom of the lower cylinder 8. The breathable membrane is laid flat on the lower cylinder 8, and both ends of the breathable membrane are wound around the take-up roller 18 and rotated. The moving screw 29 can drive the arc plate 28 to move downward. The arc plate 28 can position the two ends of the breathable membrane. Then, it pulls down the gear 2 31, so that the gear 2 31 disengages from the gear 1 30. Then, the handle 19 is turned to drive the winding roller 18 to rotate and wind up the two ends of the breathable membrane, so that the breathable membrane is in a taut state for testing. After winding is completed, the gear 2 31 is released. Under the action of the spring 34, the slider 33 can drive the gear 2 31 to reset and mesh with the gear 1 30 to achieve a locking effect, so as to ensure the stability and taut state of the breathable membrane during the testing process. The drain pipe 13 and the air inlet pipe 23 at the bottom are both equipped with solenoid valves. The opening and closing of the two pipes can be controlled by the solenoid valves. The rotating end of the take-up roller 18 is fixedly connected to a handle 19. The outer end of the slide bar 35 is fitted with a spring 34. One end of the spring 34 is fixedly connected to the bottom of the slide groove 32, and the other end is fixedly connected to the slider 33. By setting the spring 34, the slider 33 can have the effect of elastic reset, thereby ensuring that the gear 2 31 can quickly reset after being released and mesh with the gear 1 30 to lock. An air pump 40 is fixedly connected to the left connecting seat 2. One end of the air pump 40 is provided with an air inlet pipe 23, and the other end of the air inlet pipe 23 is provided inside the lower cylinder 8. When the air pump 40 is started, air can be sent into the lower cylinder 8 through the air inlet pipe 23, thereby cooperating with the breathable membrane to perform air permeability testing. A motor 41 is fixedly connected to the outer end of the right-side connecting seat 2. A slot 20 is provided on the right-side connecting seat 2, and a lead screw 21 is rotatably connected inside the slot 20. The output end of the motor 41 is fixedly connected to the lead screw 21. A threaded block 22 is threaded onto the lead screw 21. A movable frame 3 is fixedly connected to the top of the threaded block 22. A cylinder 4 is fixedly connected to the outer end of the movable frame 3. The extension end of the cylinder 4 passes through the movable frame 3 and is fixedly connected to a water spray frame 24. A water tank 5 is provided on one side of the right-side connecting seat 2. A water pipe 7 is installed through the upper end of the water tank 5. A water pump 6 is installed in the middle of the water pipe 7. The other end of the water pipe 7 passes through the interior of the water spray frame 24. Several nozzles 25 are provided at the lower end of the water spray frame 24. After the air permeability test is completed... Then, the upper cylinder 10 moves upward, and the second motor 41 starts to drive the second lead screw 21 to rotate. Under the action of the threaded connection, the threaded block 22 can drive the movable frame 3 to move, thereby moving the water spray assembly above the lower cylinder 8. The position of the water spray assembly can be adjusted by the cylinder 4. After the adjustment is completed, the water pump 6 is started to draw water from the water tank 5 into the interior of the water spray frame 24 through the water pipe 7, and spray it downward through the nozzle 25 to contact the permeable membrane. The permeated water can enter the interior of the lower cylinder 8, and the solenoid valve inside the drain pipe 13 can be opened to drain the permeated water into the container, thereby observing the amount of permeation to test the waterproof effect of the breathable membrane, thus completing the entire breathable and waterproof test.

[0018] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the air permeability of a breathable film, comprising a base (1), characterized in that: Both ends of the base (1) are fixedly connected with connecting seats (2), four upper ends of the base (1) are fixedly connected with stand columns (14), the top of the stand column (14) is fixedly connected with a top plate (9), both lower ends of the top plate (9) are rotatably connected with lead screws (16), the lead screws (16) are threadedly connected with movable plates (15), both upper ends of the top plate (9) are fixedly connected with motors (12), the output ends of the motors (12) are fixedly connected with the lead screws (16), the inner end of the movable plate (15) is fixedly connected with an upper cylinder (10), the upper middle part of the base (1) is fixedly connected with a lower cylinder (8), the inner ends of the upper cylinder (10) and the lower cylinder (8) are fixedly connected with sealing rings, and the upper middle part of the top plate (9) is provided with an opening (11). Both upper ends of the movable plate (15) are fixedly connected with mounting racks (39), the top of the mounting rack (39) is fixedly connected with a mounting plate (36), the middle part of the inner side of the mounting plate (36) is fixedly connected with a pressure sensor (37), the inside of the upper cylinder (10) is movably connected with an movable rod (26), the movable rod (26) is slidably connected with the mounting rack (39), and the top of the movable rod (26) is fixedly connected with a limiting plate (38), and the limiting plate (38) corresponds to the pressure sensor (37). Both upper ends of the base (1) are provided with connecting racks (17), the inside of the connecting rack (17) is rotatably connected with winding rollers (18), both outer ends of the winding roller (18) are fixedly connected with fixed racks (27), both upper ends of the fixed rack (27) are threadedly connected with screw rods (29), the lower end of the screw rod (29) is rotatably connected with arc-shaped plates (28), the rotating end of the winding roller (18) is fixedly connected with gear wheels (30), both outer ends of the connecting rack (17) are provided with sliding grooves (32), the inside of the sliding groove (32) is fixedly connected with sliding rods (35), the sliding rod (35) is slidably connected with sliding blocks (33), the outer end of the sliding block (33) is fixedly connected with gear wheels (31), the gear wheels (30) and the gear wheels (31) are meshed with each other, and the bottom of the lower cylinder (8) penetrates through a drain pipe (13).

2. The device for testing the air permeability of a breathable film according to claim 1, wherein: The rotating end of the winding roller (18) is fixedly connected with a handle (19) outward, and the outer end of the sliding rod (35) is sleeved with a spring (34).

3. The device of claim 2, wherein: One end of the spring (34) is fixedly connected at the bottom of the sliding groove (32), and the other end is fixedly connected on the sliding block (33).

4. The device of claim 1, wherein: The left connecting seat (2) is fixedly connected with an air pump (40), one end of the air pump (40) penetrates through an air inlet pipe (23), and the other end of the air inlet pipe (23) penetrates through the inside of the lower cylinder (8).

5. The device of claim 1, wherein: The outer end of the right connecting seat (2) is fixedly connected with a motor (41), the right connecting seat (2) is provided with a slot (20), the inside of the slot (20) is rotatably connected with a lead screw (21), and the output end of the motor (41) is fixedly connected with the lead screw (21).

6. The air permeability testing apparatus for a breathable film according to claim 5, wherein: Threaded connection has threaded block (22) on the screw rod two (21), the top of threaded block (22) is fixedly connected with movable frame (3), the outer end of movable frame (3) is fixedly connected with air cylinder (4).

7. The air permeability testing apparatus for a breathable film according to claim 6, wherein: The extending end of air cylinder (4) is fixedly connected with water spraying frame (24) through movable frame (3) inward, and the side of right connecting seat (2) is provided with water tank (5).

8. The air permeability testing apparatus for a breathable film according to claim 7, wherein: The upper end of water tank (5) is provided with water pipe (7) penetratingly, water pump (6) is installed in the middle of water pipe (7), the other end of water pipe (7) is provided in water spraying frame (24) penetratingly, and a plurality of spray heads (25) are arranged in the lower end of water spraying frame (24).

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