Automobile plug air tightness test tool

Abstract

The utility model provides an automobile plug air tightness test tool comprising a test head, the test head is provided with a plugging port for plugging a plug, the test head is internally provided with a test air cavity and a sealing air cavity, the plugging port is communicated with the sealing air cavity, an insertion port for communicating the test air cavity and the sealing air cavity is arranged between the test air cavity and the sealing air cavity, and the insertion port and the plugging port are coaxially arranged. A circular-ring-shaped air bag is arranged in the sealing air cavity, a first air hole communicated with the testing air cavity is formed in the testing head, and a second air hole communicated with the air bag is formed in the testing head. During testing, the plug is inserted from the insertion port and sequentially enters the second guide tube and the first guide tube, then air is input into the air bag through the air pressure control device, the air bag is expanded to form a sealed package for the outer side wall of the plug, and the testing head and the plug are put into water; and the air pressure control device inputs air into the test air cavity and observes whether bubbles are generated in the water, so that whether the air tightness of the plug is qualified or not is judged.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a testing fixture for the airtightness of automotive plugs. Background Technology

[0002] In the production process of automotive wiring harnesses, the harnesses need to be assembled into plugs, which are then used to connect corresponding devices. Automotive electrical circuits have extremely high requirements for airtightness, especially at connection points. Poor airtightness in automotive wiring means inadequate waterproofing, making the wiring highly susceptible to oxidation, which can lead to damage or short circuits, ultimately causing serious safety issues. Therefore, airtightness testing of wiring harness plugs is particularly important.

[0003] In the prior art, utility model patent application number CN202020115379.1 discloses a device for testing the airtightness of a wire plug. This device connects a pressure control device and the plug via a sealing head. During testing, after connecting the plug to the sealing head, the plug and sealing head are placed in water. The pressure control device supplies gas to the sealing head and plug, and the airtightness of the plug is determined by observing whether bubbles are generated in the water. However, in this technical solution, the sealing head, a key tooling component connecting to the plug, faces the problem of how to achieve a stable and sealed connection with the plug, which urgently needs to be solved. Currently, some similar tooling components on the market either suffer from loose connections leading to gas leakage and affecting the accuracy of test results, or have unreasonable connection structure designs, resulting in cumbersome operation and reduced production efficiency. Utility Model Content

[0004] In view of the problems pointed out in the background art, this utility model proposes an automotive plug airtightness testing fixture to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A testing fixture for the airtightness of an automotive plug includes a test head with a connector for plug insertion. The test head contains a test air chamber and a sealing air chamber. The connector communicates with the sealing air chamber. An insertion port connects the test air chamber and the sealing air chamber. The insertion port and the connector are coaxially arranged. An annular air bladder is provided inside the sealing air chamber. The test head has a first air hole communicating with the test air chamber and a second air hole communicating with the air bladder.

[0007] The present invention is further configured such that the test head is a cylindrical shell structure, the test head is provided with a partition, the two sides of the partition are a test air chamber and a sealing air chamber respectively, and the insertion port is set on the partition.

[0008] The present invention is further configured to include a first guide tube coaxially connected to the insertion port, the first guide tube being located within the sealed air cavity.

[0009] The present invention is further configured to include a second guide tube coaxially connected to the insertion interface. The second guide tube is located inside the sealed air cavity. The first guide tube and the second guide tube are spaced apart, and a sealing area is formed between the first guide tube and the second guide tube. The sealing area is located at the middle position of the axial direction of the airbag.

[0010] The present invention is further configured such that a limiting mesh plate is provided inside the first guide tube.

[0011] The present invention is further configured such that the test head is composed of a housing 1 and a housing 2, a test air chamber is formed inside the housing 1, a sealed air chamber is formed inside the housing 2, the housing 2 is arranged to face the opening of the housing 1, and the housing 2 and the housing 1 are detachably connected.

[0012] The present invention is further configured such that the second housing and the first housing are connected by a thread.

[0013] The present invention is further configured such that the outer side wall of the airbag is adapted and fixedly connected to the inner side wall of the second shell.

[0014] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0015] The automotive plug airtightness testing fixture provided by this utility model involves inserting the plug into the connector, sequentially entering the second guide tube and the first guide tube, and then inputting gas into the airbag through the air pressure control device. The airbag inflates, forming a sealed enclosure for the outer wall of the plug. The test head and plug are then placed in water. The air pressure control device then inputs gas into the test air chamber, and the presence of air bubbles in the water is observed to determine whether the plug's airtightness is up to standard.

[0016] The test head and plug of this application have good sealing performance, and the structure is simple and easy to operate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a cross-sectional view of the present invention.

[0020] Figure 3 This is an exploded view of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of this utility model.

[0022] The following are the labels in the attached diagram: 1. Insertion port; 2. Test air chamber; 3. Sealing air chamber; 4. Insertion port; 5. Airbag; 6. First air hole; 7. Second air hole; 8. Partition plate; 9. First guide tube; 10. Second guide tube; 11. Sealing area; 12. Limiting mesh plate; 13. Housing 1; 14. Housing 2. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] For reference as follows Figures 1-4 The present invention will be described as follows:

[0025] Example: A test fixture for testing the airtightness of an automotive plug includes a cylindrical test head. One axial end of the test head has a connector 1 for plug insertion. This connector serves as the entrance for the plug into the fixture and is directly connected to a sealing air chamber 3, providing an initial channel for plug insertion.

[0026] The test head housing serves as the basic framework of the entire tooling. Its cylindrical housing structure not only facilitates manufacturing but also provides a stable installation space for the internal components. Furthermore, its cylindrical design is compatible with the common shape of plugs, which is beneficial for the smooth insertion and positioning of the plugs.

[0027] The test head is divided into two independent spaces by a partition 8. The test head contains a test air chamber 2 and a sealing air chamber 3. The connector 1 is connected to the sealing air chamber 3. An insertion port 4 is provided between the test air chamber 2 and the sealing air chamber 3 to connect the two. The insertion port 4 and the connector 1 are coaxially arranged. This design ensures the straightness of the plug insertion path and avoids insertion difficulties or sealing failure due to angular deviation.

[0028] The sealed air chamber 3 is equipped with a ring-shaped air bladder 5.

[0029] The test head has a first air hole 6 that communicates with the test air chamber 2, and a second air hole 7 that communicates with the air bag 5. These two air holes serve as interfaces for connecting the external air pressure control device with the internal air circuit of the tooling, and are responsible for inputting test gas into the test air chamber 2 and sealing gas into the air bag 5, respectively.

[0030] The test head has a cylindrical shell structure and a partition 8 inside. The two sides of the partition 8 are the test gas chamber 2 and the sealing gas chamber 3, respectively. The partition 8 clearly separates the test gas chamber 2 and the sealing gas chamber 3, avoiding mutual interference between the gases in the two chambers.

[0031] The insertion port 4 is located on the partition 8. This achieves the necessary connection between the two air chambers, while the partition 8 ensures the effective function of the gas within each air chamber.

[0032] It also includes a first guide tube 9 coaxially connected to the insertion port 4, and the first guide tube 9 is located in the sealed air chamber 3.

[0033] It also includes a second guide tube 10 coaxially connected to the insertion interface 1. The second guide tube 10 is located inside the sealing air chamber 3. The first guide tube 9 and the second guide tube 10 are spaced apart, forming a sealing area 11 between them. The sealing area 11 is located at the middle position of the axial direction of the airbag 5. This structural layout provides a precise working area for the sealing effect after the airbag is inflated.

[0034] The test gas chamber 2 is a space for containing test gas. When the external air pressure control device inputs gas into it through the first air hole 6, the gas will act on the inside of the inserted plug or related sealing parts through the insertion port 4. If the plug has an airtightness defect, the gas will leak out.

[0035] The sealed air chamber 3 provides space for the installation and inflation of the airbag 5. The internal air pressure environment will not interfere with the test gas in the test air chamber 2, ensuring the independence of the sealing and testing process.

[0036] When the airbag 5 is not inflated, it will not obstruct the insertion of the plug. When the external air pressure control device inputs gas into it through the second air hole 7, the airbag 5 expands. Since it is located in the sealing area 11 and corresponds to the outer wall of the plug, the expanded airbag can tightly wrap the outer wall of the plug, forming a reliable sealing structure. This prevents the gas in the test air chamber 2 from leaking from the gap between the plug and the tooling, ensuring that only the airtightness defects of the plug itself will cause gas leakage, thus guaranteeing the accuracy of the test results.

[0037] Both the first guide tube 9 and the second guide tube 10 are coaxially aligned with the insertion interface 1 and the insertion port 4, providing precise guidance for the insertion of the plug. After the plug is inserted into the insertion interface 1, it sequentially enters the second guide tube 10 and the first guide tube 9, ensuring that the plug accurately reaches the designated position axially and preventing the sealing effect of the airbag 5 from being affected by plug insertion misalignment. At the same time, the sealing area 11 formed by the two guide tubes provides a clear target area for the airbag 5, allowing the airbag 5 to accurately act on the corresponding position of the plug after inflation, further improving the reliability of the seal.

[0038] The first vent 6 is the channel for the test gas to enter the test gas chamber 2. It is connected to an external air pressure control device, which can control the input amount and pressure of the test gas. The second vent 7 is the channel for the sealing gas to enter the airbag 5. It is also connected to an external air pressure control device. The expansion degree of the airbag 5 is controlled by adjusting the pressure of the input gas to adapt to the sealing requirements of plugs of different sizes.

[0039] Test process:

[0040] During testing, the plug to be tested is inserted into the socket 1 and smoothly enters the designated position under the guidance of the second guide tube 10 and the first guide tube 9. At this time, the outer wall of the plug corresponds to the sealing area 11.

[0041] Gas is introduced into the airbag 5 through the second air hole 7 via an external air pressure control device. The airbag 5 expands in the sealed air chamber 3. Due to the restriction of the first guide tube 9 and the second guide tube 10, the expanded airbag 5 will fit tightly against the outer wall of the plug, forming a complete seal between the plug and the tooling, preventing subsequent test gas from leaking from here.

[0042] The test head and plug, after being sealed, are placed in water together. Gas is then introduced into the test air chamber 2 through the first air hole 6 via the air pressure control device. The gas acts on the inside of the plug or related sealing parts through the insertion port 4 on the partition 8. If the plug is airtight, there will be no leaks inside or at the connection points, and no bubbles will be generated in the water. If the plug has airtight defects, such as gaps or holes, the gas in the test air chamber 2 will leak into the water through these defects, generating visible bubbles, thus indicating that the plug is not airtight.

[0043] Excellent sealing performance: Compared with traditional mechanical seals, the expansion-type sealing design of the airbag 5 can better adapt to the slight shape differences of the outer wall of the plug. By using gas pressure, the airbag is tightly fitted to the surface of the plug, achieving all-round sealing and effectively avoiding test errors caused by poor sealing.

[0044] Simple and compact structure: The entire fixture is based on a cylindrical test head, with internal partitions dividing the air chambers. Combined with guide tubes and airbags, the structure is rationally laid out and has no complex mechanical transmission mechanism, which not only reduces manufacturing difficulty and cost but also reduces the possibility of failure.

[0045] Convenient and efficient operation: During the testing process, the steps of plug insertion, airbag inflation and sealing, test gas input, and result observation are all simple and intuitive, requiring no complicated operating skills. Furthermore, airbag inflation and deflation can be quickly achieved through a pressure control device, facilitating rapid plug replacement for continuous testing, improving testing efficiency, and making it suitable for online testing needs in mass production.

[0046] High adaptability: By adjusting the inflation pressure of the airbag, it can adapt to the sealing requirements of plugs of different diameters and specifications, eliminating the need to design tooling separately for each type of plug, thus enhancing the versatility and practicality of the tooling.

[0047] The first guide tube 9 is equipped with a limiting mesh plate 12. After the plug is inserted, it is inserted until it abuts against the limiting mesh plate 12, thus completing the insertion. The limiting mesh plate 12 is a plate-shaped component with evenly distributed mesh holes. The function of these mesh holes is to allow the gas in the test gas chamber 2 to pass through and act on the inside of the plug after it is inserted, while preventing the plug from going further in, ensuring that the insertion position of the plug is highly consistent each time.

[0048] The test head consists of a housing 13 and a housing 2 14. Housing 13 forms a test gas chamber 2, and housing 2 14 forms a sealed gas chamber 3. The test head adopts a split structure composed of housing 13 and housing 2 14, a design primarily based on manufacturing process and ease of maintenance considerations. Housing 13 and housing 2 14 respectively form the test gas chamber 2 and the sealed gas chamber 3; the design of two independent gas chambers effectively avoids mutual interference of gases during the test.

[0049] Housing 2 14 has an opening facing housing 1 13, and housing 2 14 and housing 1 13 are detachably connected. Housing 2 14 and housing 1 13 are connected by threads.

[0050] The detachable design allows for easy inspection or replacement of components such as the airbag 5 inside the tooling when they are damaged or worn out, thus extending the tooling's service life.

[0051] The outer wall of the airbag 5 is fitted and fixedly connected to the inner wall of the housing 14. This can be achieved through interference fit, sealant bonding, or mechanical clamping. This fixing method ensures that the airbag 5 will not shift during inflation, thus guaranteeing the stability of the seal.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A testing fixture for the airtightness of an automotive plug, comprising a test head, the test head having a connector for plug insertion, characterized in that: The test head has a test air chamber and a sealing air chamber. The insertion interface is connected to the sealing air chamber. There is an insertion port connecting the test air chamber and the sealing air chamber. The insertion port and the insertion interface are coaxially arranged. There is an annular air bladder in the sealing air chamber. The test head has a first air hole that communicates with the test air chamber and a second air hole that communicates with the air bladder.

2. The automotive plug airtightness testing fixture according to claim 1, characterized in that: The test head has a cylindrical shell structure with a partition inside. The two sides of the partition are a test air chamber and a sealing air chamber, respectively, and the insertion port is located on the partition.

3. The automotive plug airtightness testing fixture according to claim 2, characterized in that: It also includes a first guide tube coaxially connected to the insertion port, the first guide tube being located within the sealed air chamber.

4. The automotive plug airtightness testing fixture according to claim 3, characterized in that: It also includes a second guide tube coaxially connected to the insertion interface. The second guide tube is located inside the sealed air chamber. The first guide tube and the second guide tube are spaced apart, and a sealing area is formed between the first guide tube and the second guide tube. The sealing area is located at the middle position of the axial direction of the airbag.

5. The automotive plug airtightness testing fixture according to claim 1, characterized in that: The first guide tube is equipped with a limiting mesh plate.

6. The automotive plug airtightness testing fixture according to claim 1, characterized in that: The test head consists of a housing 1 and a housing 2. A test air chamber is formed inside the housing 1, and a sealed air chamber is formed inside the housing 2. The housing 2 is positioned facing the opening of the housing 1, and the housing 2 and the housing 1 are detachably connected.

7. The automotive plug airtightness testing fixture according to claim 6, characterized in that: The second housing and the first housing are connected by threads.

8. The automotive plug airtightness testing fixture according to claim 6, characterized in that: The outer wall of the airbag is adapted and fixedly connected to the inner wall of the second shell.

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