Nondestructive testing device and method for permeability of glove material

Abstract

The invention belongs to the technical field of material barrier property testing, and particularly relates to a glove material air permeability nondestructive testing device and method, the glove material air permeability nondestructive testing device is used for conducting material air permeability detection on gloves, the detection device comprises a glove fixing assembly installed on a shell (1), and the glove fixing assembly can be used for fixing gloves in a sleeving mode; and detecting the air permeability of the material of the glove. When the detection device provided by the invention is used for detecting the air permeability of the glove material, the subsequent use of the glove is not influenced, and a low-cost scheme is provided for glove comparison and selection of a glove user; the device is compact in structure and small in size, and can be conveniently moved to any place with detection conditions to carry out detection work; the size redundancy of the glove fixing assembly part is large, and the glove fixing assembly part can adapt to the diameter and thickness sizes of all gloves for glove boxes; the number of operation parts is small, the operation process is simple and clear, and a user can quickly and skillfully master an application mode.

Description

Technical Field

[0001] The invention belongs to the technical field of material barrier property testing, and in particular relates to a device and method for nondestructive testing of air permeability of glove materials. Background Art

[0002] In scientific research and industrial production, there are a large number of chemical experiments, material processing and performance testing that require manual operation and cannot be carried out in ambient air. In order to ensure the scientific nature of the research and the safety of the operators, such operations are often carried out in glove boxes. During the use of the glove box, a special gas environment that is different from the outside world is usually created inside the box. In order to prevent a large amount of gas exchange between the box and the environment, causing damage to the box environment and leakage of harmful substances, the glove box must have very good airtightness.

[0003] Gloves are an indispensable and important component of the glove box. When operators perform operations in the glove box, they will be directly affected by substances leaking through the gloves, so their air tightness is particularly important. At the same time, because the glove material is different from the metal and glass materials used in other parts of the glove box, its air tightness is relatively weak. Therefore, the air tightness of the gloves plays a decisive role in the overall performance of the glove box. Factors affecting the air tightness of gloves include the integrity of the glove structure and the air permeability of the material. Among them, the structural integrity can be qualitatively measured by the bubble method and the pressure drop method; the material permeability is an important parameter for further evaluating the performance of the gloves, and it must be quantitatively measured.

[0004] At present, there are two main methods for testing the gas permeability of glove materials: differential pressure method and isobaric method. Among them, the differential pressure method is to use two independent cavities separated by a standard test film, one side is filled with the gas for measurement, and the other side is evacuated. The gas in the high-pressure cavity will penetrate into the low-pressure cavity through the film, and the gas permeability can be obtained by measuring the pressure or volume change of the low-pressure cavity; the isobaric method is to use two independent airflow systems separated by a standard test film, one side is the flowing gas to be tested (pure oxygen or a mixed gas containing oxygen), and the other side is the flowing high-purity nitrogen. Oxygen will penetrate from the side with high oxygen partial pressure to the side with low oxygen partial pressure, and then the oxygen permeability is tested by an oxygen sensor. The above two methods have the following disadvantages: the gloves need to be cut, which will destroy the integrity of the gloves; the detection device needs to design two cavities, and the structure is complicated; the isobaric method is based on the oxygen partial pressure penetration for measurement, and the efficiency is low. Therefore, it is necessary to design a new detection device to realize non-destructive detection of the gas permeability of glove materials. Summary of the invention

[0005] The present invention aims to provide a device for testing the air permeability of glove materials, which can complete the air permeability test of the glove materials without destroying the integrity of the gloves.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is a nondestructive testing device for air permeability of glove materials, which is used to perform air permeability testing on gloves, wherein the device comprises a glove fixing assembly installed on a shell, wherein the glove fixing assembly can be used to fix gloves and perform air permeability testing on the gloves.

[0007] Furthermore, the glove fixing assembly includes a test cavity, which is a flat plate structure with a test cavity inside. The test cavity is a disc-shaped structure with a sealed bottom and a circular opening at the top. The side wall of the test cavity is provided with a plurality of through holes for providing negative pressure to the test cavity and filling the test cavity with working gas. When the material permeability test is performed, the glove is put on the test cavity and completely covers the test cavity.

[0008] Furthermore, the glove fixing assembly also includes a fastening and sealing assembly, which is located above the test cavity and includes a support member arranged on the shell, a screw rod passing through the support member, an operating wheel located at the top end of the screw rod, and a pressure cover located at the bottom end of the screw rod. When the material air permeability test is performed, the operating wheel is rotated so that the pressure cover presses the glove onto the test cavity, thereby achieving sealing and fixing of the test cavity and the inner side of the glove.

[0009] Furthermore, the pressure cover is a disc-shaped structure, provided with a plurality of hollow structures, and a connecting cavity is also provided at the bottom portion that is in contact with the glove, and the hollow structure is connected with the connecting cavity. When the glove is pressed and fixed, the outer side of the glove can be kept in full contact with the external atmosphere through the connecting cavity and the hollow structure.

[0010] Furthermore, a sealing groove for installing an O-ring is designed on the periphery of the bottom of the gland, and the sealing ring is used to ensure the sealing between the glove and the test cavity.

[0011] further,

[0012] A three-way valve, a flow valve and a vacuum port are also provided on the shell;

[0013] The first port of the three-way valve is connected to one of the through holes in the side wall of the test chamber through the flow valve;

[0014] The second port of the three-way valve is connected to the vacuum port to form a vacuum pump branch; the vacuum port is used to connect a vacuum pump to provide negative pressure for the test chamber through the vacuum pump;

[0015] A flow meter and a nitrogen port are also provided on the housing. The third port of the three-way valve is connected to the nitrogen port to form a nitrogen source branch. The nitrogen port is used to connect a high-purity nitrogen source. The flow meter is connected in series on the gas path between the third port and the nitrogen port to detect the nitrogen flow rate.

[0016] The three-way valve can control the vacuum pump branch and the nitrogen source branch to be connected separately. When the three-way valve is controlled to connect the vacuum pump branch, the test chamber can be evacuated to negative pressure by adjusting the flow valve; when the three-way valve is controlled to connect the nitrogen source branch, the test chamber can be cleaned; the flow valve and the flow meter can be used together to control the nitrogen flow.

[0017] Furthermore, a differential pressure gauge, an exhaust valve and an exhaust port are also provided on the shell, and the differential pressure gauge is connected to one of the through holes in the side wall of the test chamber. At the same time, the differential pressure gauge is also connected to the exhaust port through the exhaust valve, and the exhaust port is connected to the external atmosphere; the differential pressure gauge can detect the pressure of the test chamber in real time, and is used for pressure control during the process of pumping negative pressure into the test chamber.

[0018] Furthermore, an oxygen analyzer is provided on the shell, and the oxygen analyzer is connected to one of the through holes in the side wall of the test cavity, and the oxygen analyzer is also connected to the external atmosphere; the oxygen analyzer can detect the oxygen concentration in the test cavity in real time, and is used to control the oxygen concentration during the cleaning process of the test cavity, and is also used to monitor the change of oxygen concentration during the material permeability detection process.

[0019] Furthermore, a safety valve is provided on the shell, and the safety valve is connected to one of the through holes in the side wall of the test chamber, and the safety valve is also connected to the external atmosphere; if the pressure of the test chamber exceeds a set safety value, the safety valve will automatically open to release the pressure.

[0020] Furthermore, four supporting feet are arranged at the bottom of the shell to support, heighten and level the entire shell.

[0021] Furthermore, the flow meter, the differential pressure gauge, the oxygen analyzer, the three-way valve, the exhaust valve, the flow valve, the safety valve, the vacuum port, the nitrogen port and the exhaust port are all integrated into one through the shell, and the connecting pipes and related circuits between the various components are arranged inside the shell; the shell is composed of a plurality of aluminum alloy plates.

[0022] To achieve the above object, the present invention also discloses a method for nondestructive testing of glove material air permeability used in the above-mentioned nondestructive testing device for air permeability of glove material, comprising the following steps:

[0023] Step S1, firstly, sealing and fixing the glove to be tested on the glove fixing assembly;

[0024] Step S2, pumping negative pressure into the test chamber for the first time;

[0025] Step S3, starting to clean the test chamber with nitrogen;

[0026] Step S4, determining whether the oxygen concentration in the test chamber meets the standard; if it meets the standard, proceed to step S5, otherwise repeat step S3;

[0027] Step S5, pumping negative pressure into the test chamber for a second time;

[0028] Step S6, allowing the environment in the test chamber to stabilize for 5 minutes;

[0029] Step S7: Using the oxygen analyzer and the differential pressure gauge to monitor the change of oxygen concentration and the maintenance of pressure in the test chamber.

[0030] Furthermore, in step S1, the glove is firstly put on the test cavity so that the glove completely covers the test cavity; then the operating wheel is rotated to control the pressure cover to descend to press the glove tightly so that a seal is formed between the inner side of the glove and the test cavity.

[0031] Further, in the step S2, the negative pressure of the test chamber needs to reach -1 kPa, and then enter the step S3; in the step S2, the negative pressure extraction operation needs to close the exhaust valve, open the flow valve, close the nitrogen source branch through the three-way valve, and open the vacuum pump branch through the three-way valve, and turn on the vacuum pump to provide negative pressure for the test chamber.

[0032] Further, in the step S3, the operation of cleaning the test chamber requires opening the exhaust valve, closing the vacuum pump branch through the three-way valve, turning off the vacuum pump, and simultaneously opening the nitrogen source branch through the three-way valve to connect the high-purity nitrogen source. If the pressure of the test chamber exceeds the set safety value, the safety valve will automatically open to release the pressure.

[0033] Furthermore, in step S4, the judgment criterion is that the oxygen concentration in the test chamber reaches 50 ppm.

[0034] Furthermore, in the step S5, the negative pressure is pumped out for the second time so that the pressure in the test chamber reaches -1 kPa, and then the exhaust valve and the flow valve are closed.

[0035] Furthermore, in step S7, the monitoring time is 30 minutes, and the pressure change of the test chamber during the detection process must be less than 50Pa, otherwise re-detection is required; during the detection process, it is only necessary to observe the changes in the readings of the oxygen analyzer and the differential pressure gauge, and the exhaust valve and the flow valve remain in a completely closed state.

[0036] The beneficial effects of the present invention are:

[0037] 1. The detection device provided by the present invention will not affect the subsequent use of the gloves when detecting the air permeability of the glove material, and provides a low-cost solution for glove users to compare and select gloves.

[0038] 2. The detection device provided by the present invention has a compact structure and small size, and can be easily moved to any place with detection conditions to carry out detection work.

[0039] 3. The glove fixing assembly in the detection device provided by the present invention has a large size redundancy and can adapt to the diameter and thickness of all gloves used in glove boxes.

[0040] 4. The detection device provided by the present invention has a small number of operating components and a simple and clear operating process, which is convenient for users to quickly and proficiently master the application method. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of a nondestructive testing device for air permeability of a glove material according to a specific embodiment of the present invention;

[0042] Figure 2 yes Figure 1 A-direction view;

[0043] Figure 3 is a schematic diagram of a glove fixing assembly described in a specific embodiment of the present invention;

[0044] Figure 4 is a schematic diagram of the gland 8 described in a specific embodiment of the present invention;

[0045] Figure 5 is a gas path distribution diagram of a nondestructive testing device for air permeability of glove materials described in a specific embodiment of the present invention;

[0046] Figure 6 is a flow chart of a method for nondestructive testing of air permeability of glove materials described in a specific embodiment of the present invention;

[0047] In the figure: 1-shell, 2-foot, 3-test chamber, 4-fastening sealing assembly, 5-operating wheel, 6-screw, 7-support, 8-pressure cover, 9-flow meter, 10-differential pressure gauge, 11-oxygen analyzer, 12-three-way valve, 13-exhaust valve, 14-flow valve, 15-safety valve, 16-vacuum port, 17-nitrogen port, 18-emptying port, 19-test chamber, 20-through hole, 21-hollow structure, 22-sealing groove, 23-connecting chamber. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] The present invention provides a non-destructive testing device for air permeability of glove materials (such as Figure 1 , 2 As shown), it is used for gloves, including a glove fixing assembly installed on the shell 1, the glove fixing assembly can be used to fix the gloves, and perform material permeability testing on the gloves.

[0050] The glove fixing assembly includes a test cavity 3 (such as Figure 3 As shown in the figure, the test cavity 3 is a flat plate structure, and a test cavity 19 is arranged inside. The test cavity 19 is a disc-shaped structure, the bottom is a sealed structure, and the upper part is a circular opening. The side wall of the test cavity 19 is provided with a plurality of through holes 20, which are used to provide negative pressure for the test cavity 19 and fill the test cavity 19 with working gas. When the material permeability test is performed, the glove is put on the test cavity 3 and completely covers the test cavity 19.

[0051] The glove fixing assembly also includes a fastening sealing assembly 4 (such as Figure 3 As shown in the figure, the fastening and sealing assembly 4 is located above the test cavity 3, and includes a support member 7 arranged on the shell 1, a screw 6 passing through the support member 7, an operating wheel 5 located at the top end of the screw 6, and a pressure cover 8 located at the bottom end of the screw 6. When the material air permeability test is performed, the operating wheel 5 is rotated so that the pressure cover 8 presses the glove on the test cavity 3, thereby achieving sealing and fixing of the test cavity 19 and the inner side of the glove.

[0052] The gland 8 is a disc-shaped structure (such as Figure 3 As shown in the figure, a plurality of hollow structures 21 are provided, and a connecting cavity 23 is provided at the bottom portion that is in contact with the glove. The hollow structures 21 and the connecting cavity 23 are connected to each other. When the glove is pressed and fixed, the outer side of the glove can be kept in full contact with the external atmosphere through the connecting cavity 23 and the hollow structure 21.

[0053] A sealing groove 22 (such as a sealing groove 22 for installing an O-ring) is designed on the periphery of the bottom of the gland 8. Figure 4 As shown), the sealing between the glove and the test cavity 19 is ensured by a sealing ring.

[0054] The housing 1 is also provided with a three-way valve 12, a flow valve 14 and a vacuum port 16 (such as Figure 1 , 2 shown);

[0055] The first port of the three-way valve 12 is connected to a through hole 20 in the side wall of the test chamber 19 through the flow valve 14 (such as Figure 5 shown);

[0056] The second port of the three-way valve 12 is connected to the vacuum port 16 (such as Figure 5 As shown), forming a vacuum pump branch; the vacuum port 16 is used to connect the vacuum pump, and is used to provide negative pressure for the test chamber 19 through the vacuum pump;

[0057] The housing 1 is also provided with a flow meter 9 and a nitrogen port 17. The third port of the three-way valve 12 is connected to the nitrogen port 17 to form a nitrogen source branch. The nitrogen port 17 is used to connect a high-purity nitrogen source. The flow meter 9 is connected in series on the gas path between the third port and the nitrogen port 17 (such as Figure 5 As shown), used to detect nitrogen flow;

[0058] The three-way valve 12 can control the vacuum pump branch and the nitrogen source branch to be connected separately. When the three-way valve 12 is controlled to connect the vacuum pump branch, the test chamber 19 can be evacuated to negative pressure by adjusting the flow valve 14; when the three-way valve 12 is controlled to connect the nitrogen source branch, the test chamber 19 can be cleaned; the flow valve 14 and the flow meter 9 can be used together to control the nitrogen flow.

[0059] The housing 1 is also provided with a differential pressure gauge 10, an exhaust valve 13 and an exhaust port 18 (such as Figure 1 , 2 As shown), the differential pressure gauge 10 is connected to a through hole 20 in the side wall of the test chamber 19, and the differential pressure gauge 10 is also connected to the exhaust port 18 through the exhaust valve 13 (as shown in FIG. Figure 5 The differential pressure gauge 10 can detect the pressure of the test chamber 19 in real time, and is mainly used for pressure control during the negative pressure extraction process of the test chamber 19.

[0060] The housing 1 is also provided with an oxygen analyzer 11 (such as Figure 1 The oxygen analyzer 11 is connected to a through hole 20 in the side wall of the test chamber 19 (as shown in FIG. Figure 5 As shown), the oxygen analyzer 11 is also connected to the external atmosphere; the oxygen analyzer 11 can detect the oxygen concentration in the test chamber 19 in real time, which is used to control the oxygen concentration during the cleaning process of the test chamber 19, and is also used to monitor the changes in oxygen concentration during the material permeability test.

[0061] The housing 1 is also provided with a safety valve 15 (such as Figure 1As shown), the safety valve 15 is connected to a through hole 20 in the side wall of the test chamber 19 (as shown Figure 5 As shown), the safety valve 15 is also connected to the external atmosphere; if the pressure of the test chamber 19 exceeds the set safety value, the safety valve 15 will automatically open to release the pressure.

[0062] Four legs 2 are arranged at the bottom of the housing 1 (such as Figure 1 , 2 As shown), it supports, heightens and levels the entire housing 1.

[0063] The flow meter 9, the differential pressure gauge 10, the oxygen analyzer 11, the three-way valve 12, the exhaust valve 13, the flow valve 14, the safety valve 15, the vacuum port 16, the nitrogen port 17 and the exhaust port 18 are all integrated into one through the shell 1, and the connecting pipelines and related circuits between the various components are arranged inside the shell 1; the shell 1 is composed of a plurality of aluminum alloy plates.

[0064] The present invention also discloses a method for nondestructive testing of air permeability of a glove material used in the above-mentioned nondestructive testing device for air permeability of a glove material (such as Figure 6 As shown), comprising the following steps:

[0065] Step S1, firstly, the glove to be tested is sealed and fixed on the glove fixing assembly;

[0066] Step S2, performing the first negative pressure pumping on the test chamber 19 sealed with the gloves to reduce the air in the test chamber 19, thereby reducing the amount of nitrogen used in the subsequent cleaning process;

[0067] Step S3, starting to clean the test chamber 19 with nitrogen;

[0068] Step S4, determining whether the oxygen concentration in the test chamber 19 meets the standard; if it meets the standard, proceed to step S5, otherwise repeat step S3;

[0069] Step S5, pumping negative pressure into the test chamber 19 for the second time;

[0070] Step S6, allowing the environment in the test chamber 19 to stabilize for 5 minutes;

[0071] Step S7, finally, the oxygen analyzer 11 and the differential pressure gauge 10 are used to monitor the change of oxygen concentration and the maintenance of pressure in the test cavity 19. After the detection is completed, the change of oxygen concentration in the test cavity 19 is directly used to evaluate the air permeability of the glove material, or the oxygen concentration change value is converted into air permeability according to the opening area of ​​the test cavity 19, the volume of the test cavity 19 and air parameters.

[0072] In step S1 , firstly, the glove is put on the test cavity 3 so that the glove completely covers the test cavity 19 ; then the operating wheel 5 is rotated to control the pressure cover 8 to descend to press the glove so that a seal is formed between the inner side of the glove and the test cavity 19 .

[0073] In step S2, the negative pressure of the test chamber 19 needs to reach -1kPa, and then enter step S3; in step S2, the negative pressure extraction operation requires closing the exhaust valve 13, opening the flow valve 14, closing the nitrogen source branch through the three-way valve 12, and opening the vacuum pump branch through the three-way valve 12, and starting the vacuum pump to provide negative pressure for the test chamber 19.

[0074] In step S3, the operation of cleaning the test chamber 19 requires opening the exhaust valve 13, closing the vacuum pump branch through the three-way valve 12, turning off the vacuum pump, and opening the nitrogen source branch through the three-way valve 12 to connect the high-purity nitrogen source. If the pressure of the test chamber 19 exceeds the set safety value, the safety valve 15 will automatically open to release the pressure.

[0075] In step S4, the judgment criterion is that the oxygen concentration in the test chamber 19 reaches about 50 ppm.

[0076] In step S5, negative pressure is pumped out for the second time so that the pressure in the test chamber 19 reaches -1 kPa, and then the exhaust valve 13 and the flow valve 14 are closed.

[0077] In step S7, the monitoring time is 30 minutes. During the detection process, the pressure change of the test chamber 19 must be less than 50Pa, otherwise re-detection is required. During the detection process, it is only necessary to observe the changes in the readings of the oxygen analyzer 11 and the differential pressure gauge 10, and the exhaust valve 13 and the flow valve 14 remain in a completely closed state.

[0078] The device described in the present invention is not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the technical innovation scope of the present invention.

Claims

1. A non-destructive testing device for the air permeability of gloves, used for testing the air permeability of gloves, characterized by: It comprises a glove fixing assembly mounted on a housing (1), the glove fixing assembly being capable of being mounted on and used to fix gloves and to perform a material air permeability test on the gloves.

2. The non-destructive testing device for air permeability of glove materials according to claim 1, characterized in that: The glove fixing assembly comprises a test cavity (3), the test cavity (3) is a flat plate structure, a test cavity (19) is arranged inside the test cavity (19), the test cavity (19) is a disc-shaped structure, the bottom is a sealed structure, and the top is a circular opening; the side wall of the test cavity (19) is provided with a plurality of through holes (20) for providing negative pressure to the test cavity (19) and filling the test cavity (19) with working gas; when the material air permeability test is performed, the glove is put on the test cavity (3) and completely covers the test cavity (19).

3. The non-destructive testing device for air permeability of glove materials according to claim 2, characterized in that: The glove fixing assembly also includes a fastening and sealing assembly (4), which is located above the test cavity (3) and includes a support member (7) arranged on the shell (1), a screw (6) passing through the support member (7), an operating wheel (5) located at the top end of the screw (6), and a pressure cover (8) located at the bottom end of the screw (6). When the material air permeability test is performed, the operating wheel (5) is rotated so that the pressure cover (8) presses the glove against the test cavity (3), thereby achieving sealing and fixing of the test cavity (19) and the inner side of the glove.

4. The nondestructive testing device for air permeability of glove materials according to claim 3, characterized in that: The pressure cover (8) is a disc-shaped structure, provided with a plurality of hollow structures (21), and a connecting cavity (23) is also provided at the bottom portion that is in contact with the glove, the hollow structure (21) and the connecting cavity (23) are connected to each other, and when the glove is pressed and fixed, the outer side of the glove can be kept in full contact with the external atmosphere through the connecting cavity (23) and the hollow structure (21).

5. The nondestructive testing device for air permeability of glove materials according to claim 4, characterized in that: The outer periphery of the bottom of the gland (8) is designed with a sealing groove (22) for installing an O-ring, and the sealing ring is used to ensure the sealing between the glove and the test cavity (19).

6. The non-destructive testing device for air permeability of glove materials according to claim 5, characterized in that: The housing (1) is also provided with a three-way valve (12), a flow valve (14) and a vacuum port (16); The first port of the three-way valve (12) is connected to one of the through holes (20) in the side wall of the test chamber (19) through the flow valve (14); The second port of the three-way valve (12) is connected to the vacuum port (16) to form a vacuum pump branch; the vacuum port (16) is used to connect a vacuum pump to provide negative pressure for the test chamber (19) through the vacuum pump; A flow meter (9) and a nitrogen port (17) are also provided on the housing (1); the third port of the three-way valve (12) is connected to the nitrogen port (17) to form a nitrogen source branch; the nitrogen port (17) is used to connect to a high-purity nitrogen source; the flow meter (9) is connected in series to the gas path between the third port and the nitrogen port (17) to detect the nitrogen flow rate; The three-way valve (12) can control the vacuum pump branch and the nitrogen source branch to be connected separately. When the three-way valve (12) is controlled to connect the vacuum pump branch, the test chamber (19) can be evacuated to a negative pressure by adjusting the flow valve (14); when the three-way valve (12) is controlled to connect the nitrogen source branch, the test chamber (19) can be cleaned; the flow valve (14) and the flow meter (9) can be used in conjunction to control the nitrogen flow.

7. The nondestructive testing device for air permeability of glove materials according to claim 6, characterized in that: The housing (1) is also provided with a differential pressure gauge (10), an exhaust valve (13) and an exhaust port (18); the differential pressure gauge (10) is connected to one of the through holes (20) in the side wall of the test chamber (19); the differential pressure gauge (10) is also connected to the exhaust port (18) via the exhaust valve (13); the exhaust port (18) is connected to the external atmosphere; the differential pressure gauge (10) can detect the pressure of the test chamber (19) in real time, and is used for controlling the pressure of the test chamber (19) during the process of pumping negative pressure.

8. The non-destructive testing device for air permeability of glove materials according to claim 7, characterized in that: An oxygen analyzer (11) is also provided on the housing (1), and the oxygen analyzer (11) is connected to one of the through holes (20) in the side wall of the test cavity (19), and the oxygen analyzer (11) is also connected to the external atmosphere; the oxygen analyzer (11) can detect the oxygen concentration in the test cavity (19) in real time, and is used to control the oxygen concentration during the cleaning process of the test cavity (19), and is also used to monitor the change of oxygen concentration during the material permeability test process.

9. The non-destructive testing device for air permeability of glove materials according to claim 8, characterized in that: A safety valve (15) is also provided on the housing (1), and the safety valve (15) is connected to one of the through holes (20) in the side wall of the test chamber (19). The safety valve (15) is also connected to the external atmosphere. If the pressure in the test chamber (19) exceeds a set safety value, the safety valve (15) will automatically open to release the pressure.

10. The non-destructive testing device for air permeability of glove materials according to claim 9, characterized in that: Four supporting feet (2) are arranged at the bottom of the shell (1) to support, heighten and level the entire shell (1).

11. The nondestructive testing device for air permeability of glove materials according to claim 10, characterized in that: The flow meter (9), the differential pressure gauge (10), the oxygen analyzer (11), the three-way valve (12), the exhaust valve (13), the flow valve (14), the safety valve (15), the vacuum port (16), the nitrogen port (17) and the exhaust port (18) are all integrated into one through the shell (1), and the connecting pipelines and related circuits between the various components are arranged inside the shell (1); the shell (1) is composed of a plurality of aluminum alloy plates.

12. A method for non-destructive testing of glove material air permeability used in the device for non-destructive testing of glove material air permeability according to claim 11, comprising the following steps: Step S1, firstly, sealing and fixing the glove to be tested on the glove fixing assembly; Step S2, pumping negative pressure into the test chamber (19) for the first time; Step S3, starting to clean the test chamber (19) using nitrogen; Step S4, determining whether the oxygen concentration in the test chamber (19) meets the standard; if it meets the standard, proceed to step S5, otherwise repeat step S3; Step S5, pumping negative pressure into the test chamber (19) for a second time; Step S6, allowing the environment in the test chamber (19) to stabilize for 5 minutes; Step S7, using the oxygen analyzer (11) and the differential pressure gauge (10) to monitor the change of oxygen concentration and the maintenance of pressure in the test chamber (19).

13. The method according to claim 12, characterized in that: In the step S1, the glove is firstly put on the test cavity (3) so that the glove completely covers the test cavity (19); then the operating wheel (5) is rotated to control the pressure cover (8) to descend to press the glove tightly so that a seal is formed between the inner side of the glove and the test cavity (19).

14. The method according to claim 12, wherein: In the step S2, the negative pressure of the test chamber (19) needs to reach -1 kPa, and then enter the step S3; in the step S2, the negative pressure extraction operation needs to close the exhaust valve (13), open the flow valve (14), close the nitrogen source branch through the three-way valve (12), and open the vacuum pump branch through the three-way valve (12), and start the vacuum pump to provide negative pressure for the test chamber (19).

15. The method according to claim 12, characterized in that: In the step S3, the operation of cleaning the test chamber (19) requires opening the exhaust valve (13), closing the vacuum pump branch through the three-way valve (12), turning off the vacuum pump, and simultaneously opening the nitrogen source branch through the three-way valve (12) to connect the high-purity nitrogen source. If the pressure of the test chamber (19) exceeds a set safety value, the safety valve (15) will automatically open to release the pressure.

16. The method of claim 12, wherein: In step S4, the judgment criterion is that the oxygen concentration in the test chamber (19) reaches 50 ppm.

17. The method according to claim 12, characterized in that: In the step S5, negative pressure is pumped out for the second time so that the pressure in the test chamber (19) reaches -1 kPa, and then the exhaust valve (13) and the flow valve (14) are closed.

18. The method according to claim 12, characterized in that: In the step S7, the monitoring time is 30 minutes. During the detection process, the pressure change of the test chamber (19) must be less than 50 Pa, otherwise re-detection is required; during the detection process, it is only necessary to observe the changes in the readings of the oxygen analyzer (11) and the differential pressure gauge (10), and the exhaust valve (13) and the flow valve (14) remain in a completely closed state.

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