Material air permeability testing device and method based on knee pad production and warm-keeping knee pad

Abstract

The invention relates to the technical field of air permeability testing, and discloses a material air permeability testing device and method based on kneecap production and a warm kneecap wherein the material air permeability testing device based on kneecap production comprises a bending mechanism used for supporting, bending and stretching a kneecap, a sample outlet pipe having one end arranged in the bending mechanism and the other end arranged in the sample outlet pipe; the bending mechanism comprises a first simulation part, a connecting piece arranged on the outer wall of the first simulation part, a second simulation part arranged at one end, far away from the first simulation part, of the connecting piece, a third simulation part elastically sleeving the outer wall of the connecting piece, and a through hole formed in the outer wall of the third simulation part. The device can effectively evaluate the influence of the relative displacement between the material layers on the air permeability in the actual use process of the warm-keeping kneecap, especially when the knee bends.

Description

Technical Field

[0001] The present invention relates to the technical field of air permeability testing, and particularly to an air permeability testing device, method, and warm knee pad for materials used in the production of knee pads. Background Art

[0002] A knee pad is a wearable device mainly used to protect the knee joint, provide support, keep warm, or relieve pain. Among them, a warm knee pad is specifically designed for cold environments to provide additional heat preservation for the knee joint. To achieve the warming function, warm knee pads usually adopt a multi-layer composite design, laminating materials such as a windproof film, warm cotton, and a lining together.

[0003] And air permeability is one of the core performance indicators of knee pads, especially warm knee pads. Good air permeability is crucial for wearing comfort. Knee pads with poor air permeability are prone to cause stuffiness and sweat accumulation, thus leading to skin discomfort.

[0004] Currently, air permeability testers for knee pad materials mainly rely on static testing methods. The knee pad sample is placed flat, and the air permeation amount per unit time is measured. This can test the air permeability of the knee pad in a static flat state, but it cannot accurately simulate the air permeability of the knee pad during actual use, especially when the knee is bent. When the knee is bent, the knee pad is stretched, and relative sliding or local peeling may occur between its multi-layer materials (such as a windproof film, warm cotton, and a lining), resulting in the closure of the originally designed air-permeable micropores or fiber gaps due to misalignment, thereby seriously affecting the air permeability of the knee pad.

[0005] Therefore, existing static air permeability testing devices often cannot accurately evaluate the impact of relative displacement between material layers on air permeability during actual use of knee pads, especially during knee bending movements. This leads to a deviation between the test results and the actual use experience, and cannot provide reliable support for the design and material selection of knee pads. Summary of the Invention

[0006] In view of the problem that existing technologies often cannot accurately evaluate the impact of relative displacement between material layers on air permeability during actual use of knee pads, especially during knee bending movements, an air permeability testing device, method, and warm knee pad for materials used in the production of knee pads are proposed.

[0007] On the one hand, the present application provides an air permeability testing device for materials used in the production of knee pads, and its purpose is to: be able to simulate the air permeability testing of multi-layer warm knee pad materials under the state of knee bending movement.

[0008] The technical solution of the present invention is as follows: A material air permeability testing device for knee pads production, including a bending mechanism for supporting and bending and stretching the knee pads; a sample outlet tube, one end of which is arranged inside the bending mechanism, and the other end of which is connected with a testing reagent spraying device; the bending mechanism includes a first simulation part, a connecting piece arranged on the outer wall of the first simulation part, a second simulation part arranged at the end of the connecting piece away from the first simulation part, a third simulation part elastically sleeved on the outer wall of the connecting piece, and a through hole opened on the outer wall of the third simulation part. During the test, both ends of the knee pad are sleeved on the first simulation part, the third simulation part and the second simulation part respectively, and one end of the sample outlet tube passes through the second simulation part to reach the inside of the third simulation part.

[0009] Further, the bending mechanism further includes a plurality of reset springs annularly arranged on the outer wall of the connecting piece, and the other ends of the reset springs are located inside the third simulation part.

[0010] Further, the third simulation part includes a support ring sleeved on the outside of the connecting piece and guide rings symmetrically arranged on both side surfaces of the support ring.

[0011] Further, the vertical cross-section of the support ring is in a π shape, and the vertical cross-section of the guide ring is in a horizontal V shape.

[0012] Further, there are a plurality of through holes, and the plurality of through holes are concentrated on one side of the outer wall of the third simulation part.

[0013] Further, it further includes an installation mechanism connected to the bending mechanism to provide an installation space for the bending mechanism; the installation mechanism includes a transparent test box arranged outside the third simulation part, a first slide rail arranged on the inner side surface of the transparent test box, a first T-shaped rod arranged inside the first slide rail, a second slide rail arranged on the inner side surface of the transparent test box, and a second T-shaped rod arranged inside the second slide rail. The end of the vertical rod of the first T-shaped rod away from the transverse plate is fixedly connected to the outer wall of the second simulation part, and the end of the vertical rod of the second T-shaped rod away from the transverse plate is fixedly connected to the outer wall of the first simulation part.

[0014] Further, the installation mechanism further includes a first pulling ring sleeved on the rod wall of the vertical rod of the first T-shaped rod and a second pulling ring sleeved on the rod wall of the vertical rod of the second T-shaped rod; the installation mechanism further includes a first electric push rod arranged on the inner bottom surface of the transparent test box and a second electric push rod arranged on the inner bottom surface of the transparent test box. The movable end of the first electric push rod is fixedly connected to the outer wall of the first pulling ring, and the movable end of the second electric push rod is fixedly connected to the outer wall of the second pulling ring.

[0015] Further, the present invention also provides a material air permeability testing method for knee pads production, including the following steps, Step 1: Wrap the thermal knee pad outside the first simulation part, the third simulation part and the second simulation part, and then fix the thermal knee pad on the bending mechanism; Step 2: By controlling the operation of the test reagent spraying device, the test reagent is sprayed from the inside of the third simulation part through the sample outlet tube to conduct an air permeability test on the non-stretched thermal knee pad material; Step 3: First, rotate one end of the second simulation part away from the third simulation part until the outer wall of the second simulation part contacts the inner wall of the third simulation part, and then rotate one end of the first simulation part away from the third simulation part; Step 4: Observe the test reagent, conduct an air permeability test on the stretched thermal knee pad material, and compare it with the air permeability test result when not stretched to evaluate the influence of the relative displacement between material layers on air permeability during the actual use of the thermal knee pad, especially during knee bending movement.

[0016] Furthermore, the present invention also provides a thermal knee pad, which includes a first thermal layer, a windproof layer arranged on one side of the first thermal layer, a second thermal layer arranged on the other side of the first thermal layer, and a magic tape arranged on the windproof layer.

[0017] Beneficial effects of the present invention: By first wrapping the thermal knee pad outside the first simulation part, the third simulation part, and the second simulation part, then fixing the thermal knee pad on the bending mechanism, first rotating one end of the second simulation part away from the third simulation part until the outer wall of the second simulation part contacts the inner wall of the third simulation part, and then rotating one end of the first simulation part away from the third simulation part, with the cooperation of the third simulation part, the material of the thermal knee pad can be stretched. By controlling the operation of the test reagent spraying device, the test reagent is sprayed from the inside of the third simulation part through the sample outlet tube to conduct an air permeability stability test on the stretched thermal knee pad material, so as to effectively evaluate the influence of the relative displacement between material layers on air permeability during the actual use of the thermal knee pad, especially during knee bending movement. Description of the Drawings

[0018] Figure 1 It is a perspective view of the first simulation part and the second simulation part in the present invention; Figure 2 It is an installation schematic diagram of the third simulation part in the present invention; Figure 3 It is of the present invention Figure 2 The enlarged schematic diagram at A in Figure 4 It is an installation schematic diagram of the return spring in the present invention; Figure 5 It is a perspective view of the third simulation part in the present invention; Figure 6 It is a cross-sectional view of the third simulation part in the present invention; Figure 7 It is a perspective view of the transparent test box in the present invention; Figure 8Isometric view of the installation mechanism in the present invention; Figure 9 Installation schematic diagram of the first T-shaped rod in the present invention; Figure 10 Isometric view of the first thermal insulation layer in the present invention; Figure 11 Installation schematic diagram of the thermal insulation knee pad in the present invention; Figure 12 Stretching schematic diagram of the thermal insulation knee pad in the present invention.

[0019] In the figure: 1. First simulation part; 2. Second simulation part; 3. Connecting piece; 4. Third simulation part; 5. Through hole; 6. Return spring; 7. Sampling tube; 8. Support ring; 9. Guide ring; 10. Transparent test box; 11. First slide rail; 12. First T-shaped rod; 13. First pulling ring; 14. First electric push rod; 15. Second slide rail; 16. Second T-shaped rod; 17. Second pulling ring; 18. Second electric push rod; 19. First thermal insulation layer; 20. Windproof layer; 21. Second thermal insulation layer; 22. Magic tape; 23. Bending mechanism; 24. Installation mechanism. Specific implementation manners

[0020] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0021] Example 1, referring to Figure 10 , which is the first embodiment of the present invention, provides: a thermal insulation knee pad, including a first thermal insulation layer 19, a windproof layer 20 fixedly installed on one side of the first thermal insulation layer 19, a second thermal insulation layer 21 fixedly installed on the other side of the first thermal insulation layer 19, and a magic tape 22 fixedly installed on the windproof layer 20.

[0022] Specifically, the main functions of the first thermal insulation layer 19 and the second thermal insulation layer 21 are to provide warmth and comfort. The selection of materials needs to comprehensively consider factors such as warmth level, comfort, cost and durability. For example, in alpine regions, it is more suitable to choose wool or fleece fabrics, while in mild regions, cotton or acrylic can be selected. The windproof layer 20, its main functions are to prevent wind, water and be breathable. Commonly used materials include polyester and nylon, and these two materials can enhance their windproof and waterproof performance through coating or laminating processes.

[0023] The purpose of the air permeability test is to verify whether the air permeability of the first thermal insulation layer 19, the second thermal insulation layer 21 and the windproof layer 20 in the thermal knee pad meets the design requirements, ensuring that the product has good ventilation while providing warmth, thereby improving the wearing comfort. Existing air permeability tests are usually based on the pressure difference method, that is, by measuring the air flow rate through the sample per unit time under a certain pressure difference to evaluate the air permeability. The test equipment accurately measures the change in air flow rate through sensors to obtain the air permeability value. However, although this can test the air permeability of the knee pad in a static flat state, it cannot accurately simulate the air permeability of the thermal knee pad during actual use, especially when the knee is bent.

[0024] During use, the thermal knee pad is wound around the human knee, and the magic tape 22 of the windproof layer 20 can be used to fix the thermal knee pad.

[0025] Example 2, referring to Figures 1 - 9 , and Figures 11 - 12 , is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a test device for measuring the air permeability of the materials used in the production of knee pads is provided, including a bending mechanism 23. The function of the bending mechanism 23 is to support the thermal knee pad and bend and stretch the thermal knee pad. One end of it is a sample outlet tube 7 located inside the knee pad during the test, and the other end of the sample outlet tube 7 is connected to a test reagent spraying device. An installation mechanism 24 is provided on the bending mechanism 23, and the function of the installation mechanism 24 is to provide an installation platform for the bending mechanism 23.

[0026] Specifically, the sample outlet tube 7 is used to spray a test reagent for testing air permeability. The test reagent can be air commonly used in the prior art, which is suitable for conventional air permeability tests, especially for evaluating the air permeability of fabrics. By measuring the air flow rate through the material under a certain pressure difference, the air permeability of the material is evaluated. The test reagent can also be water vapor commonly used in the prior art, which is particularly suitable for evaluating the comfort of materials for sports or thermal knee pads. It simulates the rate of moisture passing through the material when the human body sweats. By measuring the rate of water vapor passing through the material, the moisture permeability of the material is evaluated.

[0027] Referring to Figures 1 - 6 , the bending mechanism 23 includes a first simulation part 1, a connecting part 3 fixedly installed on the outer wall of the first simulation part 1, a second simulation part 2 rotatably installed at the end of the connecting part 3 away from the first simulation part 1, a third simulation part 4 elastically sleeved on the outer wall of the connecting part 3, and a through hole 5 opened on the outer wall of the third simulation part 4. During the test, the knee pad is sleeved on the first simulation part 1, the third simulation part 4 and the second simulation part 2, and one end of the sample outlet tube 7 passes through the second simulation part 2 to reach the inside of the third simulation part 4.

[0028] Specifically, the second simulation part 2 is rotatably mounted on the first simulation part 1 through the connecting part 3. When the knee is bent, the thermal kneepad is stretched, and relative sliding or partial peeling may occur between the multi-layer materials, which may easily cause the originally designed breathable micropores or fiber gaps to be closed due to dislocation, thereby seriously affecting the breathability of the kneepad. Therefore, in this device, the kneepad is first wrapped in the first simulation part 1, the third simulation part 4 and the second simulation part 2 through the Velcro 22, and then the second simulation part 2 is rotated first, and then the first simulation part 1 is rotated to simulate the effect of the knee movement to stretch the kneepad. At this time, the third simulation part 4 is clamped by the thermal kneepad, and its elastic sleeve structure can adapt to the curvature change of the kneepad to maintain a dynamically stable clamped state, ensuring that the test reagent (air or water vapor) can be evenly sprayed onto the surface of the kneepad through the through hole 5.

[0029] Reference Figures 1 - 6 There are multiple through holes 5, which are concentrated on one side of the outer wall of the third simulation part 4. The bending mechanism 23 also includes a return spring 6 fixedly mounted on the outer wall of the connecting member 3, and the other end of the return spring 6 is located inside the third simulation part 4, and there are multiple return springs 6.

[0030] Specifically, the other end of the reset spring 6 here can be movably stuck in the inside of the third simulation part 4, and then the tester can rotate the third simulation part 4 to align the multiple through holes 5 with the position where the thermal knee pad needs to be tested for air permeability, thereby being able to flexibly adjust the position where the thermal knee pad needs to be tested for air permeability, which is more conducive to observing the influence of the relative displacement between material layers at the key test position of the thermal knee pad on the air permeability.

[0031] The other end of the return spring 6 can also be fixedly connected to the inner wall of the third simulation part 4, thereby improving the stability of the third simulation part 4 during installation and testing.

[0032] Reference Figure 6 The third simulation part 4 includes a support ring 8 sleeved on the outside of the connecting member 3 for stretching the knee pad and a guide ring 9 symmetrically arranged on both sides of the support ring 8 for reducing the risk of slipping of the support ring 8. The vertical section of the support ring 8 is π-shaped, and the vertical section of the guide ring 9 is transversely V-shaped.

[0033] Specifically, the vertical cross-section of the support ring 8 is π-shaped. On the one hand, it reserves space inside the support ring 8 for the reset spring 6 to move, and on the other hand, it can prop up the material of the warm knee pad, more effectively simulating the state of the knee pad being stretched when the knee is bent. The vertical cross-section of the guide ring 9 is horizontally V-shaped. Through the contact between the inner walls of the two guide rings 9 and the first simulation part 1 and the second simulation part 2, the stability of the support ring 8 during testing can be effectively improved. The support ring 8 and the guide ring 9 are fixedly connected.

[0034] Example 3, referenceFigures 7 - 9 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the installation mechanism 24 includes a transparent test box 10 arranged outside the third simulation part 4, a first slide rail 11 fixedly installed on the side surface of the inner wall of the transparent test box 10, a first T-shaped rod 12 movably installed inside the first slide rail 11, a second slide rail 15 fixedly installed on the side surface of the inner wall of the transparent test box 10, and a second T-shaped rod 16 movably installed inside the second slide rail 15. Moreover, the end of the vertical rod of the first T-shaped rod 12 far from the transverse plate is fixedly connected to the outer wall of the second simulation part 2, and the end of the vertical rod of the second T-shaped rod 16 far from the transverse plate is fixedly connected to the outer wall of the first simulation part 1.

[0035] The installation mechanism 24 further includes a first pulling ring 13 sleeved on the rod wall of the vertical rod of the first T-shaped rod 12 and a second pulling ring 17 sleeved on the rod wall of the vertical rod of the second T-shaped rod 16; The installation mechanism 24 further includes a first electric push rod 14 fixedly installed on the bottom surface of the inner wall of the transparent test box 10 and a second electric push rod 18 fixedly installed on the bottom surface of the inner wall of the transparent test box 10. Moreover, the movable end of the first electric push rod 14 is fixedly connected to the outer wall of the first pulling ring 13, and the movable end of the second electric push rod 18 is fixedly connected to the outer wall of the second pulling ring 17.

[0036] Specifically, through the arranged first electric push rod 14 and second electric push rod 18, power can be provided for the rotation of the first simulation part 1 and the second simulation part 2. First, by controlling the contraction of the movable end of the first electric push rod 14, the first pulling ring 13 pulls the first T-shaped rod 12 to slide downward along the inside of the first slide rail 11. The first T-shaped rod 12 drives the end of the second simulation part 2 far from the third simulation part 4 to rotate downward until the outer wall of the second simulation part 2 contacts the inner wall of the third simulation part 4. Subsequently, by controlling the contraction of the movable end of the second electric push rod 18, similarly, the end of the first simulation part 1 far from the third simulation part 4 can be driven to rotate downward. The third simulation part 4 can achieve a dynamically stable clamped state under the wrapping of the second simulation part 2 and the warming knee pad.

[0037] Refer to Figure 8 , a detection sensor for detecting the air permeability of the knee pad is fixedly installed on the inner wall of the transparent test box 10, and a logic controller is fixedly installed on the top surface of the first simulation part 1. Moreover, the logic controller is electrically connected to the detection sensor.

[0038] Specifically, the detection sensor can be a common pressure sensor or humidity sensor in the prior art. Multiple detection sensors can be provided and evenly distributed on the inner wall of the transparent test box 10. The specific test method and the distribution position of the sensor types can be determined according to actual use requirements and are not limited herein.

[0039] The remaining structures are the same as those in Embodiment 2.

[0040] Working principle: First, wrap the first thermal insulation layer 19 and the second thermal insulation layer 21 of the thermal knee pad around the outside of the first simulation part 1, the third simulation part 4, and the second simulation part 2. Then, the two ends of the thermal knee pad can be fixed on the first simulation part 1 and the second simulation part 2 through the magic tape 22 of the thermal knee pad.

[0041] Control the working of the test reagent spraying device, and the test reagent sprays out from the sample tube 7. The test reagent can be common air or water vapor in the prior art to evaluate the air permeability of the thermal knee pad in the non-stretched state.

[0042] Then, by controlling the contraction of the movable end of the first electric push rod 14, the first pulling ring 13 pulls the first T-shaped rod 12 to slide downward along the inside of the first slide rail 11. The first T-shaped rod 12 drives the end of the second simulation part 2 away from the third simulation part 4 to rotate downward until the outer wall of the second simulation part 2 contacts the inner wall of the third simulation part 4. Subsequently, control the contraction of the movable end of the second electric push rod 18. Similarly, it can drive the end of the first simulation part 1 away from the third simulation part 4 to rotate downward. In this process, the third simulation part 4 can achieve a dynamically stable clamped state under the wrapping of the second simulation part 2 and the thermal knee pad.

[0043] The materials of the thermal knee pad (the first thermal insulation layer 19, the second thermal insulation layer 21, and the windproof layer 20) achieve the effect of bending and stretching under the action of the first simulation part 1, the third simulation part 4, and the second simulation part 2. At this time, by observing the test reagent, the influence of the relative displacement between the material layers on the air permeability during the actual use of the thermal knee pad, especially during the knee bending movement, can be effectively evaluated.

[0044] Example 4, refer to Figures 1 - 12 , which is the fourth embodiment of the present invention, provides a method for testing the air permeability of materials for knee pad production, using a device for testing the air permeability of materials for knee pad production, including the following steps: Step 1: Wrap the thermal knee pad around the outside of the first simulation part 1, the third simulation part 4, and the second simulation part 2, and then fix the thermal knee pad on the bending mechanism 23. Step 2: By controlling the working of the test reagent spraying device, make the test reagent spray out from the inside of the third simulation part 4 through the sample tube 7 to test the air permeability of the non-stretched material of the thermal knee pad. Step 3: First, rotate the end of the second simulation part 2 away from the third simulation part 4 until the outer wall of the second simulation part 2 contacts the inner wall of the third simulation part 4, and then rotate the end of the first simulation part 1 away from the third simulation part 4. Step 4: Observe the test reagent, conduct a breathability test on the stretched thermal knee pad material, and compare the results with the breathability test results when not stretched, so as to evaluate the influence of the relative displacement between material layers on breathability during the actual use of the thermal knee pad, especially during knee bending exercises.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A material air permeability testing device based on knee pad production, characterized in that: include: A bending mechanism (23), the bending mechanism (23) is used to support, bend and stretch the knee pad; A sample outlet tube (7), one end of which is disposed in the bending mechanism (23), and the other end of which is connected to a test reagent ejection device; The bending mechanism (23) comprises a first simulation part (1), a connecting piece (3) arranged on the outer wall of the first simulation part (1), a second simulation part (2) arranged at one end of the connecting piece (3) away from the first simulation part (1), a third simulation part (4) elastically sleeved on the outer wall of the connecting piece (3), and a through hole (5) opened on the outer wall of the third simulation part (4), and during testing, the two ends of the knee pad are sleeved on the first simulation part (1), the third simulation part (4) and the second simulation part (2) respectively, and one end of the sample outlet tube (7) passes through the second simulation part (2) to reach the inside of the third simulation part (4).

2. The material air permeability testing device based on knee pad production according to claim 1, characterized in that: The bending mechanism (23) further comprises a plurality of return springs (6) arranged in an annular shape on the outer wall of the connecting member (3), and the other end of the return spring (6) is located inside the third simulation part (4).

3. The material air permeability testing device based on knee pad production according to claim 2 is characterized in that: The third simulation part (4) comprises a support ring (8) sleeved on the outside of the connecting piece (3) and guide rings (9) symmetrically arranged on two side surfaces of the support ring (8).

4. The material air permeability testing device based on knee pad production according to claim 3 is characterized in that: The vertical cross-section of the support ring (8) is in the shape of a letter π, and the vertical cross-section of the guide ring (9) is in the shape of a transverse letter V.

5. The material air permeability testing device based on knee pad production according to claim 4 is characterized in that: A plurality of through holes (5) are provided, and the plurality of through holes (5) are centrally arranged on one side of the outer wall of the third simulation part (4).

6. The material air permeability testing device based on knee pad production according to claim 1, characterized in that: It also includes a mounting mechanism (24) connected to the bending mechanism (23) to provide a mounting space for the bending mechanism (23); The mounting mechanism (24) comprises a transparent test box (10) arranged outside the third simulation part (4), a first slide rail (11) arranged on the inner wall side of the transparent test box (10), a first T-shaped rod (12) arranged inside the first slide rail (11), a second slide rail (15) arranged on the inner wall side of the transparent test box (10), and a second T-shaped rod (16) arranged inside the second slide rail (15), wherein one end of the vertical rod of the first T-shaped rod (12) away from the horizontal plate is fixedly connected to the outer wall of the second simulation part (2), and one end of the vertical rod of the second T-shaped rod (16) away from the horizontal plate is fixedly connected to the outer wall of the first simulation part (1).

7. The material air permeability testing device based on knee pad production according to claim 6, characterized in that: The mounting mechanism (24) further comprises a first pulling ring (13) sleeved on the vertical rod wall of the first T-shaped rod (12) and a second pulling ring (17) sleeved on the vertical rod wall of the second T-shaped rod (16); The mounting mechanism (24) further comprises a first electric push rod (14) arranged on the bottom surface of the inner wall of the transparent test box (10) and a second electric push rod (18) arranged on the bottom surface of the inner wall of the transparent test box (10), wherein the movable end of the first electric push rod (14) is fixedly connected to the outer wall of the first actuating ring (13), and the movable end of the second electric push rod (18) is fixedly connected to the outer wall of the second actuating ring (17).

8. A method for testing the air permeability of materials produced based on knee pads, using the device for testing the air permeability of materials produced based on knee pads as claimed in claim 4, characterized in that: The following steps are involved: Step 1: Wrap the warm knee pad around the outside of the first simulation part (1), the third simulation part (4) and the second simulation part (2), and then fix the warm knee pad on the bending mechanism (23); Step 2: by controlling the test reagent ejection device to operate, the test reagent is ejected from the inside of the third simulation part (4) through the sample outlet tube (7), and the air permeability of the unstretched thermal knee pad material is tested; Step 3: first rotating one end of the second simulation part (2) away from the third simulation part (4) until the outer wall of the second simulation part (2) contacts the inner wall of the third simulation part (4), and then rotating one end of the first simulation part (1) away from the third simulation part (4); Step 4: Observe the test reagents, conduct an air permeability test on the thermal knee pad material after stretching, and compare the test results with the air permeability test results when not stretched, so as to evaluate the influence of the relative displacement between material layers on the air permeability of the thermal knee pad during actual use, especially when the knee is bent.

9. A warm kneepad, applied to the material air permeability testing device based on kneepad production according to claim 1, characterized in that: The invention comprises a first thermal insulation layer (19), a windproof layer (20) arranged on one side of the first thermal insulation layer (19), a second thermal insulation layer (21) arranged on the other side of the first thermal insulation layer (19), and a Velcro (22) arranged on the windproof layer (20).

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