Airtightness detection device in connector production process and control method thereof

Abstract

The invention discloses an airtightness detection device in a connector production process and a control method thereof. The invention discloses an air tightness detection device in a connector production process and a control method thereof, and aims to provide the air tightness detection device in the connector production process, which can perform multi-dimensional air tightness detection in the connector production process, ensure the product quality, reduce the rejection rate in a product final detection process, and have the effects of improving the product quality and reducing the cost, and the control method thereof. The key points of the technical scheme are that the connector comprises a connector body composed of a plug connector and a socket connector, and is characterized in that two ends of the connector body are provided with airtightness detection tools used for detecting the airtightness of the connector; the air tightness detection tool comprises an air tightness tool gas cylinder connecting end matched with the plug connector, a socket air tightness cabin matched with the socket connector and a sealing screw arranged at one end of the socket air tightness cabin. The method is suitable for the technical field of connector airtightness detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of connector airtight detection, more particularly, it relates to a kind of airtight detection device and control method in the production process of connector. BACKGROUND

[0002] With the deepening of deepwater and ocean research, the connector under water is more and more important, the sealing performance detection of product is usually carried out by water tight detection for the current domestic manufacturers, the manual cost, time cost and equipment cost are all high, and the product may be scrapped once leakage occurs;The sealing performance detection is carried out by airtight test in the production process, which greatly reduces the sinking cost. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the present application is to provide a kind of airtight detection device and control method in the production process of connector, which can carry out multi-dimensional airtight performance detection in the production process of connector, ensure product quality, reduce the scrap rate in the product final inspection process, improve product quality and reduce cost.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an airtight detection tool in the production process of connector, comprising a connector body composed of a plug connector and a socket connector, the connector body is provided with an airtight detection tool for detecting the sealing performance of the connector at both ends, the airtight detection tool comprises an airtight tool gas cylinder connecting end matched with the plug connector, a socket airtight cabin matched with the socket connector and a sealing screw arranged at one end of the socket airtight cabin, the sealing screw is used to block the socket airtight cabin, and the connector body is ventilated, and the leakage rate of each sealing point is detected by using a gas spectrum analyzer.

[0005] The present application is further provided as follows: the length of the socket airtight cabin is 1 / 2-2 / 3 of the socket connector.

[0006] The present application is further provided as follows: the blocking end of the sealing screw is equipped with an elastic sealing gasket, and the elastic sealing gasket is matched with the inner wall of the port of the socket airtight cabin to enhance the airtightness of the blocking.

[0007] The present application is further provided as follows: the connection thread specification of the airtight tool gas cylinder connecting end and the sealing screw is the same, and the two can be replaced with each other at the corresponding installation position to realize reverse detection.

[0008] The present application also provides a control method of airtight detection device in the production process of connector, comprising the following steps:

[0009] S1, Preparation and mode selection: Install the socket airtight chamber in the matching socket connector, seal the socket airtight chamber with sealing screws, and select helium test or connect a nitrogen cylinder for pressure maintaining performance test and pool bubble experiment according to the airtight performance requirements:

[0010] S11, High requirement airtight performance detection: The helium gas inlet pressure of helium test is controlled in the range of 0.1-0.5 MPa, the helium gas cylinder hose is connected to the airtight tool gas cylinder connection end, after filling helium, the composition change curve of the leaked gas is analyzed in real time by using a gas spectrum analyzer, and the system can preliminarily judge whether the leakage point is located in the sealing ring, the interface or the cable outlet and other specific positions by comparing the historical fault data model with the leakage rate:

[0011] 1. The leakage rate randomly fluctuates at a very low level, and it is determined to be a qualified product;

[0012] 2. The leakage rate gradually rises and reaches a stable platform, indicating that there is a small but stable leakage path:

[0013] Further increase the inflation pressure by 0.05 MPa each time, in the range of 0.1-0.5 MPa, and record the leakage rate at each pressure; if the leakage rate and the pressure show an approximate linear growth, the fitting degree R 2 ≥0.95, it is determined to be an interface gap; if the leakage rate increases suddenly after a certain pressure threshold, the increase is >30%, it is determined to be a sealing ring aging;

[0014] 3. If the leakage rate quickly reaches a peak and then remains stable, it is determined that there is a gap or contamination in the mating interface, and it is recommended to clean the contact surface and check the mating size for further differentiation:

[0015] a. Use a dust-free cloth soaked in anhydrous ethanol to wipe the mating interface repeatedly to remove possible contaminants such as oil, metal chips, dust, etc., and let the interface dry for 5-10 minutes after wiping;

[0016] b. Re-inflate according to the original test pressure and monitor the change in leakage rate; if the leakage rate decreases by ≥60% after retesting and the stable value is within the qualified threshold, it is determined to be interface contamination; if the leakage rate decreases by <20% or remains at a high stable value after decreasing, it is preliminarily determined that there is a gap in the mating interface;

[0017] c. Use a micrometer or plug gauge to measure the actual size of the mating interface, such as the outer diameter of the socket connector and the inner diameter of the socket airtight chamber, and compare it with the size tolerance on the design drawing; if the size deviation exceeds the design allowable range ±0.02 mm, it is confirmed to be a gap in the mating interface; if the size meets the requirements, further check whether there are hidden scratches or depressions in the interface;

[0018] 4. The leakage rate continues to increase linearly, and there is no stable trend, then it is determined that the tail sealing area has structural defects, and the pouring process needs to be checked;

[0019] S12, low requirement air tightness detection: the pressure holding time of the pressure holding performance experiment is not less than 30 minutes, the pressure holding pressure is 0.2-0.4 MPa, a nitrogen cylinder is connected, nitrogen is filled, the pressure change is monitored through a pressure sensor to judge the pressure holding performance, the connector is immersed in a water pool to observe the bubble situation, and the pressure-time curve of the whole pressure holding process is recorded and analyzed in real time:

[0020] 1. The curve is rapidly stabilized after a slight decline caused by temperature balance and system elastic deformation, and it is predicted that the test passes at 15-20 minutes, and it is determined that the product is qualified;

[0021] 2. The curve continues to decrease linearly and uniformly, which indicates that there is a small but stable leakage path, which is caused by aging of the sealing ring or a micro gap at the interface;

[0022] 3. The curve sharply drops and then slowly decays, which indicates that there is a structural defect or a significant leakage caused by improper installation;

[0023] S2, overall air tightness detection of the connector: when the connector head does not perform longitudinal sealing treatment, the overall air tightness is detected by the above sealing and inflation steps in one experiment;

[0024] S3, reverse test: the gas tight tool gas cylinder connection end and the gas tight tool sealing screw connection thread have the same characteristics, and the reverse test is directly replaced;

[0025] S4, single component air tightness detection: the corresponding sealing end cover is used for end face sealing, the gas tight tool gas cylinder connection end part is installed at the plug tail or the socket air tight cabin interface, and the corresponding air tight test steps are repeated.

[0026] The application further provides that, in step S12, at 25-30 minutes in the later pressure holding period, the pressure curve suddenly decreases:

[0027] 1. The pressure curve suddenly decreases slightly and then stabilizes, which indicates that the sealing structure is elastically relaxed under long-time pressure, and the compression amount of the sealing element needs to be adjusted or the sealing element of high elasticity needs to be replaced;

[0028] 2. The pressure curve suddenly and rapidly decreases, and the decrease amplitude exceeds 10% of the initial pressure holding pressure, and there is no subsequent stable trend, which indicates that the fitting area of the sealing element and the installation interface is locally peeled off due to long-time pressure load or the temporary sealing of the tool thread connection part fails, and it is suggested that the pre-tightening force of the sealing element and the tightening torque of the tool connection be rechecked.

[0029] The application has the following beneficial effects:

[0030] 1. The gas-tight tool gas cylinder connection end and plug connector adapter, and the socket gas-tight chamber and socket connector adapter can accurately simulate the sealing environment of the connector in actual use. When detecting, the sealing screw blocks the socket gas-tight chamber, then the connector body is ventilated, and then the gas spectrum analyzer is used to detect the leakage rate of each sealing point, so that the detection result can truly reflect the gas-tightness of the connector, avoiding detection errors caused by mismatching of the detection tool and the connector, and greatly improving the accuracy of detection.

[0031] 2. The length of the socket gas-tight chamber is set to 1 / 2-2 / 3 of the socket connector connection part, which can effectively wrap and simulate the actual sealing environment of the socket connector connection part, while avoiding material waste and increasing the overall volume of the tool due to the excessive length of the gas-tight chamber. The appropriate length makes the gas distribution in the socket gas-tight chamber more uniform during detection, which can more accurately reflect the gas-tightness of the socket connector connection part. The sealing end of the sealing screw is equipped with an elastic sealing pad, and the elastic sealing pad is adapted to the inner wall of the port of the socket gas-tight chamber, which greatly enhances the sealing performance of the sealing screw. During use, the elastic sealing pad can fill the small gap between the sealing screw and the inner wall of the port of the socket gas-tight chamber to prevent gas leakage. Even if there is some pressure fluctuation during use, the elastic sealing pad can maintain good sealing effect through its own elastic deformation. The connection thread specifications of the gas-tight tool gas cylinder connection end and the sealing screw are the same, and they can be replaced with each other at the corresponding installation position to realize reverse detection, which brings great flexibility to the detection work. In actual detection, some connectors may have problems that cannot be found by forward detection, and through reverse detection, the gas-tightness of the connector can be evaluated comprehensively from another direction.

[0032] 3. The control method of the gas-tight detection device in connector production has obvious advantages, can meet different gas-tightness requirements, accurately position and distinguish leakage problems, provides two detection modes of high and low requirements, high requirements use helium test, can accurately locate the leakage point; low requirements use nitrogen pressure and water bubble experiment, simple operation and low cost. During detection, the leakage position can be accurately judged according to the change of leakage rate, and the fault reason can be distinguished in detail through cleaning, retesting, and measuring steps, which can indicate the direction of repair and improvement, and improve product quality and stability. It can ensure the overall performance of the product, it can detect the overall gas-tightness, and it can also detect from different directions through reverse testing, avoiding missing problems in forward detection. The gas-tightness detection of single component can timely find single component defects. In addition, the comparison of data accumulated during detection process and historical fault model can help product design and process continuous improvement, and enhance the market competitiveness of enterprises.

[0033] 4. When the pressure curve suddenly drops slightly and tends to be stable, it is determined that the sealing structure is elastically relaxed due to long-time pressure; if the pressure curve obviously and rapidly drops and the amplitude exceeds 10% of the initial pressure maintaining pressure and has no stable trend, it is determined that the sealing part and the installation interface bonding area are locally peeled off or the temporary sealing of the threaded connection part of the tooling is invalid. Such accurate diagnosis avoids blind troubleshooting, enables the maintenance personnel to quickly lock the fault source, saves a lot of time and energy, and greatly improves the maintenance efficiency. The method can provide a clear direction for subsequent improvement. For the elastic relaxation problem of the sealing structure, the compression amount of the sealing part is adjusted or the sealing part of high elasticity material is replaced; for the local peeling of the sealing part bonding area or the threaded connection problem of the tooling, it is suggested to recheck the pre-tightening force of the sealing part and the tightening torque of the tooling connection. Through these targeted improvement measures, the problems found in the air tightness detection can be effectively solved, the sealing performance and overall quality of the connector are improved, the product failure and the defective rate caused by the sealing problem are reduced, and the competitiveness of the product in the market is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 is a schematic diagram of the three-dimensional structure of the present application;

[0035] Fig. 2 is a sectional view of the present application;

[0036] Fig. 3 is a flow chart of a control method embodiment of an air tightness detection device in a connector production process;

[0037] Fig. 4 is a pressure maintaining curve analysis diagram of connector air tightness detection;

[0038] Fig. 5 is a dynamic leakage spectrum analysis diagram of connector air tightness detection;

[0039] Figs. 1-5 Reference signs: 1, plug connector; 2, socket connector; 3, connector body; 4, air tightness tooling gas cylinder connection end; 5, socket air tightness cabin; 6, sealing screw. DETAILED DESCRIPTION

[0040] Reference Figs. 1-5 Further explanation of the embodiments of the present application.

[0041] For ease of description, spatially relative terms such as "upper", "lower", "left", "right", and the like, are used herein for the purpose of illustrating one element or feature's relationship to another element or feature, as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if a device is inverted, elements described as being on the "lower" side of other elements or features would then be oriented on "upper" sides of the other elements or features. The exemplary term "lower" can therefore encompass both an orientation of "lower" and "upper" depending on the particular orientation of the device. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0042] Also, the terms "first" and "second" are used herein only to distinguish one element from another, and do not necessarily have to imply these elements are in any sequence, either temporally or spatially.

[0043] Figs. 1 to 5 The air tightness detection tool in the connector production process shown includes a connector body 3 composed of a plug connector 1 and a socket connector 2, and air tightness detection tools are arranged at both ends of the connector body 3 for detecting the sealing performance of the connector. The air tightness detection tools include an air tightness tool gas cylinder connecting end 4 adapted to the plug connector 1, a socket air tightness cabin 5 adapted to the socket connector 2, and a sealing screw 6 arranged at one end of the socket air tightness cabin 5. The air tightness tool gas cylinder connecting end 4 is adapted to the plug connector 1, and the socket air tightness cabin 5 is adapted to the socket connector 2, so that the sealing environment of the connector in actual use can be accurately simulated. During detection, after the sealing screw 6 blocks the socket air tightness cabin 5, the connector body 3 is ventilated, and then a gas spectrum analyzer is used to detect the leakage rate of each sealing point, so that the detection result can truly reflect the air tightness performance of the connector, and the detection error caused by the mismatch between the detection tool and the connector is avoided, and the detection accuracy is greatly improved. The whole detection process is simple and efficient, reduces the detection time and labor cost, and for the connector in large-scale production, the detection efficiency on the production line can be significantly improved, the production progress of the product can be accelerated, and the production benefit of the enterprise can be improved.

[0044] When the length of the socket air-tight cabin 5 is less than 1 / 2 of the socket connector connecting part, the air-tight cabin is too short to provide sufficient buffer space and sealing path for the internal gas, and when the connector is working, the gas is easy to leak from the gap, which greatly reduces the air-tight performance; when the length of the socket air-tight cabin 5 is greater than 2 / 3 of the socket connector connecting part, the socket air-tight cabin 5 is too long to occupy too much space, which brings difficulties to the overall layout, at the same time, the processing difficulty and working hours in the production process will also increase accordingly, which increases the manufacturing cost; therefore, the length of the socket air-tight cabin 5 is 1 / 2-2 / 3 of the socket connector connecting part, and the appropriate length makes the distribution of the gas in the socket air-tight cabin 5 more uniform during detection, which can more accurately reflect the air-tightness of the connecting part of the socket connector 2, and also can avoid the waste of materials and the increase of the overall volume of the tooling while ensuring the effective wrapping of the connecting part of the socket connector 2 and the simulation of the actual sealing environment.

[0045] The sealing end of the sealing screw 6 is equipped with an elastic sealing gasket which is matched with the inner wall of the port of the socket air-tight cabin 5, which greatly enhances the air-tightness of the sealing, and in the use process, the elastic sealing gasket can fill the small gap between the sealing screw 6 and the inner wall of the port of the socket air-tight cabin 5 to prevent gas leakage, even if there is a certain pressure fluctuation in the use process, the elastic sealing gasket can also maintain good sealing effect through its elastic deformation.

[0046] The connection thread specification of the air-tight tooling gas cylinder connecting end 4 and the sealing screw 6 is the same, and the two can be replaced with each other at the corresponding installation positions to realize reverse detection, which brings great flexibility to the detection work, and in actual detection, some connectors may have problems that are difficult to find through forward detection, and through reverse detection, the air-tightness of the connector can be comprehensively evaluated from another direction.

[0047] The application also provides a control method of an air-tight detection device in a connector production process, which comprises the following steps:

[0048] S1, preparation work and mode selection: install the socket air-tight cabin 5 on the matching socket connector 2, seal the socket air-tight cabin 5 with the sealing screw 6, and select helium test or connect a nitrogen cylinder for pressure maintaining performance test and water pool bubble experiment according to the air-tightness requirement:

[0049] S11, high requirement air-tightness detection: the helium gas inlet pressure of the helium test is controlled in the range of 0.1-0.5 MPa, the helium gas cylinder hose is connected to the air-tight tooling gas cylinder connecting end 4, and after the helium gas is filled, the composition change curve of the leaked gas is analyzed in real time by using a gas spectrum analyzer, and the system can preliminarily judge whether the leakage point is located at the sealing ring, the interface or the cable outlet and other specific positions by comparing the leakage rate with the historical fault data model:

[0050] 1. The leakage rate fluctuates randomly at a very low level, and the product is determined to be qualified;

[0051] 2. The leakage rate gradually increases and reaches a stable platform, indicating that there is a small but stable leakage path:

[0052] Further increase the inflation pressure by 0.05 MPa each time, with a range of 0.1 MPa to 0.5 MPa, and record the leakage rate at each pressure; if the leakage rate and pressure show an approximate linear growth, the fitting degree R 2 ≥0.95, it is determined to be an interface micro-gap; if the leakage rate increases suddenly after a certain pressure threshold, with an increase of >30%, it is determined to be a seal ring aging;

[0053] 3. If the leakage rate quickly reaches a peak and then remains stable, it is determined that there is a gap or contamination in the mating interface, and it is recommended to clean the contact surface and check the mating size for further differentiation:

[0054] a. Use a dust-free cloth soaked in anhydrous ethanol to wipe the sealing contact ring band back and forth to remove possible contaminants such as oil, metal cutting chips, dust, etc., and let the interface dry for 5-10 minutes after wiping;

[0055] b. Re-inflate to the original test pressure and monitor the change in leakage rate; if the leakage rate decreases by ≥60% after retesting, and the stable value is within the qualified threshold, it is determined to be contamination of the mating interface; if the leakage rate decreases by <20% or remains at a high stable value after decreasing, it is initially determined that there is a gap in the mating interface;

[0056] c. Use a micrometer or plug gauge to measure the actual size of the mating interface, such as the outer diameter of the socket connector 2 and the inner diameter of the socket air-tight cabin 5, and compare it with the size tolerance on the design drawing; if the size deviation exceeds the design allowable range ±0.02 mm, it is confirmed to be a gap in the mating interface; if the size meets the requirements, further check whether there are hidden scratches or depressions in the interface;

[0057] 4. If the leakage rate continues to increase linearly without a stable trend, it is determined to be a structural defect in the tail sealing area, which needs to be checked for the pouring process;

[0058] S12, low requirement air-tightness detection: the pressure holding time of the pressure holding performance test is not less than 30 minutes, the pressure holding pressure is 0.2 MPa-0.4 MPa, a nitrogen cylinder is connected, nitrogen is filled, the pressure change is monitored by a pressure sensor to judge the pressure holding performance, the connector is immersed in a water tank to observe the bubble situation, and the pressure-time curve of the whole pressure holding process is recorded and analyzed in real time:

[0059] 1. The curve is quickly stabilized after a slight decline caused by temperature balance and system elastic deformation, and it is predicted that the test is passed at 15-20 minutes, and the product is determined to be qualified;

[0060] 2. Curve continues, uniform linear downward trend, determine the presence of a small but stable leakage path, for the aging of the sealing ring or interface gap;

[0061] 3. Curve sharp decline after slow attenuation, then determine that there is a structural defect or improper installation caused by significant leakage;

[0062] S2, connector overall airtightness detection: when the connector head does not perform longitudinal sealing treatment, according to the above sealing and inflation steps, the overall airtightness is detected once;

[0063] S3, reverse test: using the same feature that the gas bottle connection end 4 and the gas tight tool sealing screw 6 are connected with the same thread, directly replace the reverse test;

[0064] S4, single component airtightness detection: using the corresponding sealing end cover to seal the end face, installing the airtight tool gas bottle connection end 4 part at the plug tail or socket airtight cabin 5 interface, and repeating the corresponding airtight test steps.

[0065] The control method of the airtightness detection device in the connector production has obvious advantages, can meet different airtightness requirements, accurately position and distinguish leakage problems, provides two detection modes of high and low requirements, high requirements adopt helium test, can accurately position the leakage point, low requirements use nitrogen pressure preservation and water bubble experiment, simple operation and low cost. During detection, the leakage position can be accurately judged according to the leakage rate change, and the fault reason can be distinguished in detail through cleaning, retesting, measurement and other steps, which can indicate the direction for repair and improvement, and improve product quality and stability. It can ensure the overall performance of the product, can detect the overall airtightness, and can detect from different directions through reverse test to avoid missing problems in forward test. The airtightness of single component can be detected to find single component defects in time. In addition, the accumulated data in the detection process can be compared with the historical fault model to help product design and process continuous improvement, and enhance the market competitiveness of enterprises.

[0066] The application is further provided as follows: in the step S12, when the pressure preservation period is 25-30 minutes, the pressure curve suddenly decreases:

[0067] 1. The pressure curve suddenly decreases slightly and tends to be stable, which is determined as elastic relaxation of the sealing structure under long-time pressure, and the compression amount of the sealing element needs to be adjusted or the sealing element of high elasticity needs to be replaced;

[0068] 2. The pressure curve suddenly and rapidly decreases, and the decrease amplitude is more than 10% of the initial pressure preservation pressure, and there is no subsequent stable trend, which is determined as that the fitting area of the sealing element and the installation interface is locally peeled off due to long-time pressure load or the temporary sealing of the tool thread connection part is invalid, and it is suggested to recheck the pre-tightening force of the sealing element and the tightening torque of the tool connection.

[0069] When the pressure curve suddenly drops slightly and tends to be stable, it is determined that the sealing structure is elastically relaxed due to long-time pressure; if the pressure curve significantly and rapidly decreases by more than 10% of the initial pressure maintaining pressure and has no stable trend, it is determined that the sealing part and the installation interface are locally peeled off or the temporary sealing of the threaded connection part is invalid. This accurate diagnosis avoids blind troubleshooting, allows maintenance personnel to quickly lock the fault source, saves a lot of time and energy, and greatly improves the maintenance efficiency. The method can provide a clear direction for subsequent improvement. For the elastic relaxation problem of the sealing structure, the compression amount of the sealing part is adjusted or the sealing part of high elasticity is replaced; for the local peeling of the sealing part and the threaded connection problem, the pre-tightening force of the sealing part and the tightening torque of the tool connection are rechecked. Through these targeted improvement measures, the problems found in the air tightness test can be effectively solved, the sealing performance and overall quality of the connector are improved, the product failure and the rate of defective products caused by the sealing problem are reduced, and the competitiveness of the product in the market is enhanced.

[0070] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any changes and replacements made by those skilled in the art within the scope of the technical solutions of the present application should be included in the protection scope of the present application.

[0071] Technical personnel should include all changes and replacements made within the scope of the technical solutions of the present application in the protection scope of the present application.

[0072] Within the protection scope of the present application.

Claims

1. An airtightness testing fixture in the connector manufacturing process, comprising a connector body (3) consisting of a plug connector (1) and a socket connector (2), characterized in that, The connector body (3) is provided with airtight testing fixtures at both ends for testing the sealing performance of the connector. The airtight testing fixtures include an airtight fixture gas cylinder connection end (4) adapted to the plug connector (1), a socket airtight chamber (5) adapted to the socket connector (2), and a sealing screw (6) set at one end of the socket airtight chamber (5). After the sealing screw (6) is used to seal the socket airtight chamber (5), the connector body (3) is vented, and the leakage rate of each sealing point is detected by a gas spectrum analyzer.

2. The airtightness testing device in the connector manufacturing process according to claim 1, characterized in that, The length of the socket airtight chamber (5) is 1 / 2 to 2 / 3 of the length of the socket connection part.

3. The airtightness testing device in the connector manufacturing process according to claim 1, characterized in that, The sealing screw (6) is fitted with an elastic sealing gasket at its sealing end. The elastic sealing gasket is adapted to the inner wall of the port of the socket airtight compartment (5) to enhance the sealing airtightness.

4. The airtightness testing device in the connector manufacturing process according to claim 1, characterized in that, The gas cylinder connection end (4) of the airtight tool has the same thread specification as the sealing screw (6), and the two can be interchanged in the corresponding installation position to achieve reverse detection.

5. A control method for an airtightness detection device in a connector manufacturing process according to claims 1-4, characterized in that, Includes the following steps: S1. Preparation and Mode Selection: Install the socket airtight chamber (5) onto the matching socket connector (2), seal the socket airtight chamber (5) with sealing screws (6), and select helium testing or connecting a nitrogen cylinder for pressure holding performance testing and water tank bubble experiment according to the airtightness requirements: S11. High-requirement airtightness performance test: The helium gas inlet pressure for the helium test is controlled within the range of 0.1MPa-0.5MPa. Connect the helium gas cylinder hose to the gas cylinder connection end (4) of the airtight tool. After filling with helium, use a gas spectrum analyzer to analyze the composition change curve of the leaking gas in real time. By comparing the leakage rate with historical fault data models, the system can preliminarily determine whether the leak point is located in a specific location such as the sealing ring, interface, or cable outlet.

1. If the leakage rate fluctuates randomly at an extremely low level, the product is deemed qualified.

2. The leakage rate gradually increases until it reaches a stable plateau, indicating the existence of a small but stable leakage path: Further increase the inflation pressure gradually, in increments of 0.05 MPa, within a range of 0.1 MPa to 0.5 MPa, and record the leakage rate at each pressure. If the leakage rate increases approximately linearly with the pressure, the goodness of fit R is [value missing]. 2 When the value is ≥0.95, it is determined to be an interface micro-gap; if the leakage rate increases abruptly after a certain pressure threshold, and the increase is >30%, it is determined to be sealing ring aging.

3. If the leakage rate quickly reaches its peak and then remains stable, it indicates the presence of gaps or contamination at the mating interface. It is recommended to clean the contact surfaces and check the mating dimensions for further investigation. a. Use a lint-free cloth soaked in anhydrous ethanol to repeatedly wipe the sealing contact ring of the mating interface to remove any oil, metal shavings, dust and other contaminants that may be attached. After wiping, let it stand for 5-10 minutes to allow the interface to dry. b. Refill with air at the original test pressure and monitor the change in leakage rate; if the leakage rate decreases by ≥60% after retesting and the stable value is within the qualified threshold, it is determined to be interface contamination; if the leakage rate decreases by <20%, or remains at a high stable value after the decrease, it is preliminarily determined that there is a gap at the interface. c. Use a micrometer or plug gauge to measure the actual dimensions of the mating interface, such as the outer diameter of the socket connector (2) and the inner diameter of the socket airtight chamber (5), and compare them with the dimensional tolerances of the design drawings; if the dimensional deviation exceeds the design allowable range of ±0.02mm, it is diagnosed as a mating interface gap; if the dimensions meet the requirements, further check whether there are hidden scratches or dents on the interface.

4. If the leakage rate continues to increase linearly without a stable trend, it is determined to be a structural defect in the tail sealing area, and the potting process needs to be checked in detail. S12. Low-requirement airtightness performance test: The pressure holding time for the pressure holding performance test shall not be less than 30 minutes, and the pressure holding pressure shall be 0.2MPa-0.4MPa. Connect a nitrogen cylinder, fill it with nitrogen, and use a pressure sensor to monitor pressure changes to judge the pressure holding performance. Immerse the connector in a water tank to observe the bubble situation, and record and analyze the pressure-time curve of the entire pressure holding process in real time.

1. The curve shows a slight drop caused by temperature equilibrium and system elastic deformation, then quickly stabilizes and passes the test within 15-20 minutes, indicating a qualified product.

2. The continuous and uniform linear downward trend of the curve indicates the existence of a small but stable leakage path, which is due to aging of the sealing ring or micro-gaps at the interface.

3. If the curve drops sharply and then decays slowly, it is determined that there is a significant leak due to structural defects or improper installation. S2. Overall airtightness test of connector: When the connector head is not longitudinally sealed, test the overall airtightness in one test according to the above sealing and inflation steps. S3. Reverse test: Taking advantage of the fact that the gas cylinder connection end (4) of the airtight tooling has the same connection thread as the sealing screw (6) of the airtight tooling, the reverse test is carried out by direct replacement. S4. Single component airtightness test: Use the corresponding sealing end cap to seal the end face, install the airtight tool gas cylinder connection end (4) part at the plug tail or socket airtight chamber (5) interface, and repeat the corresponding airtightness test steps.

6. The control method for an airtightness detection device in a connector manufacturing process according to claim 5, characterized in that, In step S12, during the later stage of pressure holding (25-30 minutes), a sudden drop in the pressure curve occurs:

1. If the pressure curve suddenly drops slightly and then stabilizes, it is determined that the sealing structure has become elastically relaxed due to prolonged pressure. It is necessary to adjust the compression of the seal or replace it with a seal made of a high-elasticity material.

2. If the pressure curve suddenly shows a significant and rapid drop, and the drop exceeds 10% of the initial holding pressure, without any subsequent stabilization trend, it is determined that the contact area between the seal and the installation interface has partially peeled off due to long-term pressure load, or the temporary seal of the tooling thread connection has failed. It is recommended to re-check the pre-tightening force of the seal and the tightening torque of the tooling connection.

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