Method and device for detecting leakage points and burst pressure of a toroidal pure rubber airbag

Abstract

This invention belongs to the field of rubber product testing technology, and discloses a method and device for detecting leaks and burst pressure of annular pure rubber airbags. The method includes: preparing testing fixtures comprising nylon wrapping fabric, a pressure gauge, copper tubing, connectors, industrial tape, and a protective barrier; spirally wrapping the nylon wrapping fabric around the surface of the annular pure rubber airbag and fixing it; connecting the airbag to an air source and inflating it in stages; after the first stage of inflation, spraying soap solution and allowing it to stand, and identifying leaks by observing continuous soap bubbles; continuing to test the burst pressure of airbags that pass the leak detection until the airbag bursts or the measured pressure reaches 1.2 times the designed burst pressure. The testing device includes a flexible wrapping component, a fixing component, a pressurization connection component, a pressure monitoring component, and a protective barrier component. This invention improves the convenience, safety, and accuracy of leak detection and burst pressure assessment of annular pure rubber airbags.

Description

Technical Field

[0001] This invention belongs to the field of rubber product testing technology, specifically relating to a method and device for detecting leaks and burst pressure in annular pure rubber airbags. Background Technology

[0002] Annular pure rubber airbags are widely used in sealing applications such as tunnels, rail transit, and special engineering projects. They are typically installed in rigid, sealed or semi-sealed spaces to achieve functions such as sealing, shock absorption, and energy compensation. In actual use, annular pure rubber airbags usually need to maintain stable sealing performance under certain working pressures for extended periods, while also possessing the required pressure resistance. Therefore, after the product is manufactured, it is usually necessary to test for leaks and burst pressure under working pressure conditions to determine whether the product meets the usage requirements.

[0003] Existing testing methods for pure rubber airbags mainly include tooling-based pressurization testing and bare-bag low-pressure testing. Tooling-based pressurization testing typically requires the design and fabrication of a custom-made fixture for the airbag under test, simulating the actual installation state of the airbag. While this method can reflect the airbag's pressure resistance under restraint to some extent, it suffers from problems such as long preparation time, high manufacturing costs, large fixture size, inconvenient on-site handling, and complex operation. Furthermore, in the event of a leak, the leak location is often difficult to pinpoint quickly. These problems are even more pronounced for larger annular pure rubber airbags.

[0004] Low-pressure testing of unrestrained airbags typically involves immersion in water or soap solution for observation. While this method can provide a preliminary assessment of surface leaks under low-pressure conditions, the stress state of the unrestrained airbag differs significantly from actual operating conditions. Therefore, it is difficult to effectively reflect leak points under operating pressure and to proceed with burst pressure testing. This is especially true for ultra-large annular pure rubber airbags, where the safety, stability, and reliability of testing results are severely limited as inflation pressure increases.

[0005] Furthermore, existing technologies for testing annular pure rubber airbags primarily focus on the testing steps themselves, lacking portable, flexible constraint testing devices that can be coordinated with the testing process. This often results in the need to temporarily combine various equipment to complete pressurization, constraint, protection, and observation during on-site testing, leading to poor overall testing organization and hindering the formation of standardized and repeatable testing solutions.

[0006] Therefore, there is an urgent need to provide a method and device for detecting leaks and burst pressure in annular pure rubber airbags, in order to solve the problems of long preparation time, high cost, poor portability, difficulty in accurately locating leaks under high pressure conditions, and difficulty in implementing burst pressure detection in existing detection methods. Summary of the Invention

[0007] This invention provides a method and device for detecting leaks and burst pressure in annular pure rubber airbags, thereby overcoming the problems in the prior art.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] In a first aspect, the present invention provides a method for detecting leaks and burst pressure in an annular pure rubber airbag, comprising the following steps:

[0010] S1, Prepare the testing components. The testing device includes at least nylon wrapping cloth, a pressure gauge, a copper tube, a connector adapted to the air nozzle of the annular pure rubber airbag, industrial tape, and a protective barrier.

[0011] S2, the annular pure rubber airbag is wound by spirally wrapping the nylon wrapping cloth around the surface of the annular pure rubber airbag and fixing the winding tail.

[0012] S3. Perform a working leak detection on the annular pure rubber airbag after the winding process is completed. After connecting the annular pure rubber airbag to the air source, pressurize it in stages. After the first stage of pressurization is completed, spray soap solution on the surface of the nylon wrapping cloth and let it stand. Continue to pressurize until the measured pressure P3 inside the airbag reaches 1.5 times the design working pressure P1. Determine whether there is a leak by observing whether continuous soap bubbles appear on the surface of the annular pure rubber airbag.

[0013] S4. For the annular pure rubber airbag that has passed the working leak detection, perform burst pressure test. Continue to increase the pressure in stages until the annular pure rubber airbag bursts and record the measured pressure P3, or stop the pressurization and record the test result when the measured pressure P3 reaches 1.2 times the design burst pressure P2.

[0014] Furthermore, in step S1, the nylon wrapping fabric has a thread count of not less than 840D and a density of not less than 24T. The nylon wrapping fabric is in two rolls, each roll being not less than 80m in length and 10cm in width. Before wrapping, the nylon wrapping fabric is soaked in water and drained for later use.

[0015] Furthermore, in step S2, the nylon wrapping cloth is wrapped in two layers with opposite directions. The overlap width of each turn of the nylon wrapping cloth is half the width of the cloth tape. After each layer is wrapped, industrial tape is used to fix the end. The starting or ending point of each layer of wrapping avoids the air nozzle position, and the starting or ending points of the two layers of wrapping are staggered.

[0016] Furthermore, in step S3, the annular pure rubber airbag that has undergone the winding process is unfolded and placed, the air nozzle is connected to the air source through the copper pipe and the connector, and the protective barrier is set around the annular pure rubber airbag.

[0017] Furthermore, in step S3, a staged pressurization method is used to detect working leaks. The pressurization amount in each stage is 0.02MPa, 0.05MPa or 0.10MPa, and the pressurization rate is 0.01MPa / s. After each stage of pressurization is completed, the gas source is turned off and kept in a non-depressurized state.

[0018] Furthermore, in step S3, after the first stage of pressurization is completed, soap solution is evenly sprayed twice on the surface of the nylon wrapping cloth and left to stand for 2 to 3 minutes; if continuous soap bubbles are observed at the leak point, the leak point is photographed and marked, the measured pressure P3 is recorded, the pressure is released and the detection is stopped; if no continuous soap bubbles are observed, the measured pressure P3 is photographed and recorded, the pressure is released and the detection is stopped.

[0019] Furthermore, in step S4, the annular pure rubber airbags that have passed the test in step S3 are selected for burst pressure testing.

[0020] Furthermore, in step S4, the pressure is increased in stages using the same method as in step S3 until the annular pure rubber airbag bursts. The bursting point is photographed and the measured pressure P3 at the time of bursting is recorded. When the measured pressure P3 reaches 1.2 times the designed bursting pressure P2 and the annular pure rubber airbag has not burst, the pressure is stopped, the sample is photographed, and the measured pressure P3 is recorded.

[0021] Furthermore, in step S1, a pressure gauge with a scale division of no more than 0.01 MPa is used; in step S3, the working leak detection is performed on a full inspection of each batch of products; and in step S4, the burst pressure detection is performed on one sample of each batch of products.

[0022] Secondly, the present invention provides a leak point and burst pressure detection device for an annular pure rubber airbag, comprising a flexible winding component, a fixing component, a pressurization connection component, a pressure monitoring component, and a protective enclosure component;

[0023] The flexible winding assembly includes a nylon wrapping cloth for winding around the outer surface of the annular pure rubber airbag, and the fixing assembly is used to fix the tail end of the nylon wrapping cloth.

[0024] The pressurization connection assembly includes a copper tube and a connector adapted to the annular pure rubber airbag nozzle, used to connect the annular pure rubber airbag to an external air source.

[0025] The pressure monitoring component includes a pressure gauge installed on the inflation passage for monitoring the pressure inside the airbag during the inflation process;

[0026] The protective enclosure assembly surrounds the outer perimeter of the annular pure rubber airbag in its placed state.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention employs a flexible winding constraint method to encapsulate a ring-shaped pure rubber airbag, combined with pressurized connection, pressure monitoring, and external protection for testing. This allows the airbag under test to undergo working leak detection and burst pressure testing while under constraint. Compared to testing methods that rely on dedicated rigid tooling, the testing method employed in this invention has a simpler overall structure, shorter preparation time, and is more convenient for on-site handling and setup, thus reducing testing implementation costs and improving the ease of testing operations.

[0029] This invention employs a staged pressurization method during the working leak detection phase, and combines soap solution observation with flexible winding constraint. This enables the identification of leak locations on the surface of the annular pure rubber airbag under high pressure conditions, which helps improve the pertinence and accuracy of leak detection, thereby compensating for the shortcomings of bare airbag low-pressure detection in reflecting the leakage situation under actual working pressure.

[0030] This invention, within the same testing system, first performs working leak detection on the annular pure rubber airbag, and then conducts burst pressure testing on airbags that pass the leak detection. This enables continuous evaluation of the airbag's sealing performance and pressure resistance, reduces the need to switch between different testing methods, and improves the consistency and comparability of test results. Simultaneously, the phased pressurization combined with external protection also enhances the stability and safety of the testing process, making leak and burst pressure testing of the annular pure rubber airbag easier to implement. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the end face structure of the annular pure rubber airbag in its natural state in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the end face structure of the annular pure rubber airbag under the pressure detection state in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of nylon wrapping fabric wrapped around the surface of an annular pure rubber airbag in an embodiment of the present invention;

[0034] Figure 4 This is a flowchart illustrating the leak detection process in an embodiment of the present invention.

[0035] Figure 5 This is a flowchart of the burst pressure detection process according to an embodiment of the present invention.

[0036] In the diagram, 1-ring-shaped pure rubber airbag; 2-air valve; 3-nylon wrapping fabric. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the invention. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present invention are not shown or described in the specification. This is to avoid obscuring the core parts of the invention with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0038] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0039] In this invention, Figure 1 The end face structure of the annular pure rubber airbag 1 in its natural state is shown. Figure 2 The end face structure of the annular pure rubber airbag 1 under pressure testing state is shown. Figure 3 The diagram illustrates the winding method of nylon wrapping fabric 3 around the outer surface of the annular pure rubber airbag 1. Wherein, 1 is the annular pure rubber airbag, 2 is the air nozzle, 3 is the nylon wrapping fabric, and L is the width of the nylon wrapping fabric 3. Figure 1 and Figure 2 It can be seen that the air nozzle 2 is set on the annular pure rubber airbag 1, and the nylon wrapping cloth 3 is wrapped around the outer periphery of the annular pure rubber airbag 1; Figure 3It can be seen that the nylon wrapping cloth 3 is wound in a spiral manner along the outer surface of the annular pure rubber airbag 1, and there is an overlap width between adjacent loops, which is half of the width L.

[0040] For ease of explanation, the following embodiment uses an extra-large annular pure rubber airbag as an example. In this embodiment, the design working pressure of the annular pure rubber airbag 1 is P1, the design burst pressure is P2, and the pressure value read by the pressure gauge during the test is the measured pressure P3. Preferably, P1 is 0.3 MPa and P2 is 0.6 MPa.

[0041] Example 1:

[0042] This embodiment provides a method for detecting leaks and burst pressure in an annular pure rubber airbag. The method includes two stages: working leak detection and burst pressure detection, wherein the burst pressure detection is performed after the working leak detection has passed.

[0043] See Figure 4 First, the tooling and site preparation are carried out. The testing tooling used includes nylon wrapping cloth 3, a pressure gauge with a graduation value of no more than 0.01MPa, copper pipe, a connector adapted to the air nozzle 2, industrial tape, soap solution, and industrial canvas enclosure guardrail. To improve testing safety, operators can also be equipped with safety helmets with protective masks and foam earplugs. The nylon wrapping cloth 3 is preferably made of nylon cloth with a thread count of no less than 840D and a density of no less than 24T. The length of each roll of nylon cloth is no less than 80m, and the width L is 10cm. Each roll of nylon cloth is continuous without breaks, damage, or aging. Before use, the nylon wrapping cloth 3 is soaked in water and then drained and prepared for use so that it can better adhere to the outer surface of the annular pure rubber airbag 1 when wrapped. The testing site is preferably set up in a spacious, flat, clean outdoor area away from people, with a length and width of no less than 7m.

[0044] After preparation, wrap the annular pure rubber airbag 1 with nylon cloth. Combined with... Figure 1 and Figure 3 The nylon wrapping fabric 3 is spirally wound onto the outer surface of the annular pure rubber airbag 1, with two layers wound in opposite directions, to create a more uniform flexible constraint on the annular pure rubber airbag 1 during subsequent inflation. Figure 3 Between adjacent turns of nylon wrapping fabric 3, maintain a half-width overlap, i.e., the overlap width is half the width L; when the width L is 10cm, the overlap width is 5cm. During the wrapping process, the nylon wrapping fabric 3 should be kept taut and fitted, avoiding looseness, wrinkles, or localized bulges. After each layer of nylon wrapping fabric 3 is wrapped, use industrial tape to secure the end. The start or end point of each layer of nylon wrapping fabric 3 should avoid... Figure 1 and Figure 2The location of the air nozzle 2 is shown, and the start or end point of the two layers of nylon wrapping fabric 3 are not set at the same position other than the air nozzle 2, thereby reducing the possibility of uneven force caused by excessive local layer thickness or overlapping ends.

[0045] During the leak detection phase, the completed, wound annular pure rubber airbag 1 is first unfolded and placed in the testing area, ensuring it is neatly arranged and essentially horizontal. Then, an industrial canvas fencing is erected around the annular pure rubber airbag 1. Subsequently, the copper pipe and connector are connected to... Figure 1 and Figure 2 The air nozzle 2 shown is connected to the external air source, connecting the inside of the annular pure rubber airbag 1 to the inflation passage. The internal pressure during inflation is monitored in real time using a pressure gauge. After starting the air source, a slow, staged inflation method is used to detect leaks. The inflation rate for each stage can be selected as 0.02 MPa, 0.05 MPa, or 0.10 MPa, with an inflation rate of 0.01 MPa / s. After each stage of inflation is completed, the air source is shut off and the system remains in a non-depressurized state. After the first stage of inflation is completed, in... Figure 2 The nylon wrapping fabric 3 covering the outer periphery of the annular pure rubber airbag 1 is uniformly sprayed with soap solution twice, and then left to stand for 2 to 3 minutes. During this standing period, the surface of the nylon wrapping fabric 3 is quickly visually inspected for the appearance of continuous soap bubbles. Then, the pressure is increased in stages as described above until the measured pressure P3 inside the annular pure rubber airbag 1 reaches 1.5 times the design working pressure P1. Taking this embodiment as an example, when P1 is 0.3 MPa, the target pressure for leak detection is 0.45 MPa.

[0046] During the leak detection process, if Figure 2 If continuous soap bubbles are observed at a certain point on the surface of the nylon wrapping fabric 3, a leak is determined to exist at that location. At this point, the leak point is first photographed and recorded, then the area where the leak is located is visually marked, and the current measured pressure P3 is recorded. The pressure is then released and the test is stopped. If no continuous soap bubbles are observed after reaching the specified test pressure, the test status is photographed and the pressure is recorded, then the pressure is released again, ending the working leak detection. Preferably, the working leak detection involves a full inspection of each batch of products to ensure that products entering the subsequent burst pressure testing stage are in a state free of obvious working leaks.

[0047] See Figure 5During the burst pressure testing phase, a ring-shaped pure rubber airbag 1, which had passed the aforementioned leak point test, was selected as the sample. The tooling preparation, nylon cloth wrapping, sample placement, external enclosure setup, and inflation connection were repeated. During testing, a staged, slow pressurization method was used, with each stage's pressurization rate selected as 0.02 MPa, 0.05 MPa, or 0.10 MPa, and the pressurization rate maintained at 0.01 MPa / s. After each stage of pressurization was completed, the air source was shut off and kept in a non-depressurized state, allowing it to stand for 2 to 3 minutes for observation. Figure 2 Check for any abnormalities on the outer periphery of the annular pure rubber airbag 1 under the indicated conditions. During continued pressurization, if the annular pure rubber airbag 1 bursts, immediately record the measured pressure P3 at the time of bursting and photograph the burst site. If the annular pure rubber airbag 1 has not burst when the measured pressure P3 reaches 1.2 times the design burst pressure P2, stop pressurizing and photograph the sample's condition. Taking this embodiment as an example, when P2 is 0.6 MPa, the stop pressurization threshold is 0.72 MPa. After the test, shut off the gas source, release the pressure, disassemble the test fixture, and clean the site. Preferably, the burst pressure test is performed by randomly sampling one piece from each batch of products.

[0048] Using the above method, Figure 2 The nylon wrapping fabric 3 covering the outer periphery of the annular pure rubber airbag 1 provides flexible constraint to the airbag 1, enabling leak detection and burst pressure testing under high pressure conditions without relying on specialized rigid testing fixtures. The phased pressurization method helps control the testing pace, the soap solution observation method improves the targeting of leak detection and location, and the external enclosure and individual protective measures enhance safety during the burst pressure testing process.

[0049] Example 2:

[0050] This embodiment provides a leak detection device for an annular pure rubber airbag and its burst pressure detection for implementing the above-described detection method. Since the existing drawings mainly show the object under test and the flexible winding state, this embodiment combines... Figures 1 to 3 The fitting relationships between the annular pure rubber airbag 1, the air nozzle 2, and the nylon wrapping cloth 3 in the testing device are explained; the copper pipe, connector, pressure gauge, and protective enclosure are not shown separately in the attached drawings.

[0051] The testing device includes a flexible winding assembly, a fixing assembly, a pressurization connection assembly, a pressure monitoring assembly, and a protective enclosure assembly. The flexible winding assembly is used to wrap around the outer surface of the annular pure rubber airbag 1, forming a flexible constraint on the annular pure rubber airbag 1; the fixing assembly is used to fix the tail end of the flexible winding assembly; the pressurization connection assembly is used to... Figure 1 and Figure 2The air nozzle 2 shown is connected to an external air source; the pressure monitoring component is used to detect the real-time pressure inside the annular pure rubber airbag 1; the protective enclosure component is used to surround the outer perimeter of the annular pure rubber airbag 1 to form an isolated protective area during the detection process.

[0052] In this embodiment, the flexible winding assembly adopts Figures 1 to 3 The nylon wrapping fabric 3 shown is constructed. The nylon wrapping fabric 3 is preferably made of nylon fabric with a thread count of not less than 840D and a density of not less than 24T, and a width L of 10cm. Combined with... Figure 3 The nylon wrapping fabric 3 is spirally wound around the outer surface of the annular pure rubber airbag 1, preferably in two layers, with the two layers wound in opposite directions, and the overlap width between adjacent loops being half the width L. Figure 2 During the pressurization test, the nylon wrapping fabric 3 continuously wraps around the outer periphery of the annular pure rubber airbag 1, thereby providing a flexible restraint effect on the annular pure rubber airbag 1. The fixing component is preferably made of industrial tape, which is used to fix the end of each layer of nylon wrapping fabric 3 in the corresponding position after each layer is wrapped, so that the nylon wrapping fabric 3 is not easy to loosen during subsequent pressurization.

[0053] The pressurization connection assembly includes a copper tube and a connector adapted to the air nozzle 2. One end of the connector is connected to... Figure 1 and Figure 2 The air nozzle 2 shown is connected at one end, and the other end is connected to an external air source via a copper pipe to form an inflation path for the annular pure rubber airbag 1. The pressure monitoring component is composed of a pressure gauge, the graduation value of which is no greater than 0.01 MPa. The pressure gauge is set on the inflation path to display the pressure value in real time during the inflation process, so that the operator can judge whether the 1.5 times design working pressure required for leak detection has been reached, or whether the stop threshold for burst pressure detection has been reached. The protective enclosure component is preferably composed of an industrial canvas enclosure fence, which is set up around the annular pure rubber airbag 1 in its placed state during testing to isolate the testing area.

[0054] In this embodiment, the detection device can be used by first... Figure 3 The nylon wrapping fabric 3 shown is wrapped around Figure 1 The outer surface of the annular pure rubber airbag 1 shown is fixed with industrial tape, and then the connector is connected to... Figure 1 and Figure 2 The air nozzle 2 shown is connected and connected to the air source via a copper pipe, ensuring the pressure gauge is readable. After enclosing the annular pure rubber airbag 1 with an industrial canvas enclosure, leak detection or burst pressure testing can be performed. During leak detection, the flexible winding assembly provides flexible external constraint to the annular pure rubber airbag 1, the pressurization connection assembly supplies air to its interior, and the pressure monitoring assembly provides real-time feedback on pressure changes. The operator... Figure 2After the nylon wrapping fabric 3 is sprayed with soap solution, the foam changes can be directly observed to determine the location of the leak. During the burst pressure test, all components maintain the same coordination relationship, only continuing to increase the pressure level until bursting or reaching the stop threshold. Therefore, this detection device can be used in conjunction with the aforementioned detection method to complete the leak detection and burst pressure test of the annular pure rubber airbag 1 under working pressure conditions. In this embodiment, the safety helmet, sponge earplugs, and soap solution are auxiliary supplies in the detection process. The safety helmet and sponge earplugs are used to improve the protection level of the operator, and the soap solution is used to assist in identifying the leak. These auxiliary supplies can be conventionally configured according to the testing site, the size of the annular pure rubber airbag 1, and the pressure rating. For annular pure rubber airbags 1 of different specifications, only the length of the nylon wrapping fabric 3, the range of the enclosure arrangement, and the division of the pressure stages need to be adaptively adjusted according to its outer diameter, cross-sectional dimensions, and design pressure to complete the detection using the same principle.

[0055] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A method for detecting leaks and burst pressure in an annular pure rubber airbag, characterized in that, Includes the following steps: S1, Prepare the testing components. The testing device includes at least nylon wrapping cloth, a pressure gauge, a copper tube, a connector adapted to the air nozzle of the annular pure rubber airbag, industrial tape, and a protective barrier. S2, the annular pure rubber airbag is wound by spirally wrapping the nylon wrapping cloth around the surface of the annular pure rubber airbag and fixing the winding tail. S3. Perform a working leak detection on the annular pure rubber airbag after the winding process is completed. After connecting the annular pure rubber airbag to the air source, pressurize it in stages. After the first stage of pressurization is completed, spray soap solution on the surface of the nylon wrapping cloth and let it stand. Continue to pressurize until the measured pressure P3 inside the airbag reaches 1.5 times the design working pressure P1. Determine whether there is a leak by observing whether continuous soap bubbles appear on the surface of the annular pure rubber airbag. S4. For the annular pure rubber airbag that has passed the working leak detection, perform burst pressure test. Continue to increase the pressure in stages until the annular pure rubber airbag bursts and record the measured pressure P3, or stop the pressurization and record the test result when the measured pressure P3 reaches 1.2 times the design burst pressure P2.

2. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 1, characterized in that: In step S1, the nylon wrapping fabric has a thread count of not less than 840D and a density of not less than 24T. The nylon wrapping fabric is in two rolls, each roll being not less than 80m in length and 10cm in width. Before wrapping, the nylon wrapping fabric is soaked in water and drained for later use.

3. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 1, characterized in that: In step S2, the nylon wrapping cloth is wrapped in two layers with opposite directions. The overlap width of each turn of the nylon wrapping cloth is half the width of the cloth tape. After each layer is wrapped, industrial tape is used to fix the end. The starting or ending point of each layer of wrapping avoids the air nozzle position, and the starting or ending points of the two layers of wrapping are staggered.

4. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 1, characterized in that: In step S3, the annular pure rubber airbag that has been wrapped is unfolded and placed, the air nozzle is connected to the air source through the copper tube and the connector, and the protective barrier is set around the annular pure rubber airbag.

5. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 4, characterized in that: In step S3, a staged pressurization method is used to detect working leaks. The pressurization amount of each stage is 0.02MPa, 0.05MPa or 0.10MPa, and the pressurization rate is 0.01MPa / s. After each stage of pressurization is completed, the gas source is turned off and the system is kept in a non-depressurized state.

6. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 5, characterized in that: In step S3, after the first stage of pressurization is completed, soap solution is evenly sprayed twice on the surface of the nylon wrapping cloth and left to stand for 2 to 3 minutes. If continuous soap bubbles are observed at the leak point, the leak point is photographed and marked, the measured pressure P3 is recorded, the pressure is released and the test is stopped. If no continuous soap bubbles are observed, the measured pressure P3 is photographed and recorded, the pressure is released and the test is stopped.

7. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 1, characterized in that: In step S4, the annular pure rubber airbags that passed the test in step S3 are selected for burst pressure testing.

8. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 7, characterized in that: In step S4, the pressure is increased using the same staged pressurization method as in step S3 until the annular pure rubber airbag bursts. The bursting point is photographed and the measured pressure P3 at the time of bursting is recorded. When the measured pressure P3 reaches 1.2 times the designed bursting pressure P2 and the annular pure rubber airbag has not burst, the pressurization is stopped, the sample is photographed, and the measured pressure P3 is recorded.

9. The method for detecting leaks and burst pressure in an annular pure rubber airbag according to claim 1, characterized in that: In step S1, a pressure gauge with a scale division of no more than 0.01 MPa is used; in step S3, the working leak detection is performed on a full inspection of each batch of products; in step S4, the burst pressure detection is performed on one sample of each batch of products.

10. A device for detecting leaks and burst pressure in an annular pure rubber airbag, characterized in that, This includes flexible winding components, fixing components, pressurized connection components, pressure monitoring components, and protective fencing components; The flexible winding assembly includes a nylon wrapping cloth for winding around the outer surface of the annular pure rubber airbag, and the fixing assembly is used to fix the tail end of the nylon wrapping cloth. The pressurization connection assembly includes a copper tube and a connector adapted to the annular pure rubber airbag nozzle, used to connect the annular pure rubber airbag to an external air source. The pressure monitoring component includes a pressure gauge installed on the inflation passage for monitoring the pressure inside the airbag during the inflation process; The protective enclosure assembly surrounds the outer perimeter of the annular pure rubber airbag in its placed state.

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