Air-tightness detection clamp suitable for wire harness end face

Abstract

This utility model relates to an airtightness testing fixture for wire harness end faces, comprising a mounting base with air chamber pipelines distributed within it, and a connector mounted on the upper end of the mounting base. The connector has flow guide cavities connected to the air chamber pipelines. A left and right flow control device are also mounted on the mounting base, and these devices are connected to the air chamber pipelines. A left and right positioning device are mirror-mounted on both sides of the mounting base, with a left positioning clamp mounted on the left and a right positioning clamp mounted on the right. The left and right positioning clamps, together with the connector, form a clamping area. Thus, a modular, replaceable connector design supports multiple modes such as air injection, air extraction, and pressure holding. Employing a mirror-symmetrical lateral positioning device and a flexible gasket-fitted clearance groove structure, the clamping force is adaptively adjusted via a hinged steering mechanism driven by a cylinder.

Description

Technical Field

[0001] This utility model relates to a testing fixture, and more particularly to a gas tightness testing fixture suitable for wire harness end faces. Background Technology

[0002] In the existing automotive electronics and motor equipment manufacturing field, airtightness testing of wire harness end faces is a crucial step in ensuring the waterproof and dustproof performance of products. Traditional testing methods, such as the immersion test, are cumbersome to operate, time-consuming to dry, and prone to wasting water resources, according to the existing Chinese patent CN204214613U. Furthermore, while this patent improves the flexibility of plug positioning through a sliding base and adjustable air needle structure, it still relies on manual visual inspection of bubbles to determine the seal, making the testing accuracy highly susceptible to environmental interference, and it cannot achieve simultaneous air injection / extraction control of multiple channels on the wire harness end face.

[0003] Meanwhile, existing airtightness clamp designs generally suffer from insufficient adaptability. For example, the motor airtightness test clamp disclosed in Chinese patent CN212988725U uses a threaded mandrel and a torsion spring structure to clamp the wire harness connector. While it shortens the balancing time by directly inflating through an air tube, its clamping mechanism relies on mechanical thread adjustment, resulting in poor compatibility with wire harness end faces of different specifications. Furthermore, it lacks an independent air circuit control module, failing to meet the needs of regional testing of complex wire harness channels.

[0004] Therefore, the current technological bottlenecks are mainly reflected in three aspects:

[0005] 1. Poor versatility: The fixtures are mostly designed for specific wire harness models, and the entire fixture needs to be replaced when changing the object to be tested.

[0006] 2. Operational redundancy: Switching between gas injection and gas extraction modes requires disassembling and reassembling the pipeline, which affects efficiency.

[0007] 3. Low sealing reliability: Leakage is easily caused by tolerance when the wire harness end face is connected to the fixture.

[0008] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create an airtightness testing fixture suitable for wire harness end faces, making it more valuable for industrial applications. Utility Model Content

[0009] To solve the above-mentioned technical problems, the purpose of this utility model is to provide an airtightness testing fixture suitable for wire harness end faces.

[0010] This utility model discloses an airtightness testing fixture for wire harness end faces, comprising a mounting base, wherein: an air chamber pipeline is distributed within the mounting base; a connector is mounted on the upper end of the mounting base, the connector having a flow guiding cavity, the flow guiding cavity being electrically connected to the air chamber pipeline; a left flow control device and a right flow control device are also respectively mounted on the mounting base, the left and right flow control devices being connected to the air chamber pipeline; a left positioning device and a right positioning device are mirror-mounted on both sides of the mounting base, the left positioning device having a left positioning clamp and the right positioning device having a right positioning clamp, the left and right positioning clamps and the connector forming a clamping area.

[0011] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, the connector includes a mounting plate connected to the upper end of a mounting base. Positioning bases are distributed on the mounting plate, and a replacement connector is mounted on the positioning base. The replacement connector has a plurality of guide holes communicating with the positioning bases, and the guide holes form a flow guiding cavity.

[0012] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, sealing rings are distributed on the lower edge of the replaceable connector.

[0013] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, both the left and right conduction control devices include an airtight box connected to the mounting base. The airtight box is connected to a corresponding air chamber pipeline. An air inlet pipeline is installed on one side of the airtight box, and an air outlet pipeline is installed on the other side. The air inlet and outlet pipelines are connected to the air chamber pipelines. A conduction control valve is installed between the airtight box and the corresponding air chamber pipeline interface. A control button is installed on the upper end of the airtight box, and the control button is connected to the conduction control valve. A pressure relief pipeline is also distributed on one side of the airtight box, connecting to the air chamber pipeline, and a pressure relief valve is installed on the pressure relief pipeline.

[0014] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, the conduction control valve is a solenoid valve or a diaphragm valve, and the control button is a push-button switch.

[0015] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, both the left and right positioning devices include a cylinder connected to the mounting base. A steering hinge is mounted on the drive shaft of the cylinder, and a guide rod is mounted on the steering hinge. The front end of the guide rod is connected to a corresponding left or right positioning clamp.

[0016] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, the steering hinge includes a mounting base connected to a cylinder screw. The mounting base is connected to a pair of traction plates via a first rotating shaft. The traction plates are connected to corresponding guide rods via a second rotating shaft. The drive shaft of the cylinder is movably connected to the tail of the guide rod via a third rotating shaft. Positioning rings are installed on the outer sides of the first, second, and third rotating shafts.

[0017] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, the left and right positioning clamps are provided with clearance grooves facing the insertion device, and a flexible gasket is attached to the clearance groove.

[0018] Furthermore, in the aforementioned airtightness testing fixture for wire harness end faces, the mounting base has bearing plates installed on both sides, and the lower ends of the left and right positioning devices are connected to the corresponding bearing plates.

[0019] By means of the above solution, this utility model has at least the following advantages:

[0020] 1. Enhanced compatibility and flexibility. The modular, replaceable connector design allows for adaptation to different connector types based on the wire harness end face. Combined with independently controllable left / right conduction control, it supports multiple modes such as air injection, air extraction, and pressure holding. This achieves comprehensive coverage inspection of the internal channel structure of the wire harness end face. It significantly expands the applicability of the fixture, adapting to various wire harness specifications without requiring a complete replacement of the fixture structure, thus reducing equipment costs and maintenance complexity.

[0021] 2. Excellent positioning accuracy and sealing reliability. Utilizing a mirror-symmetrical lateral positioning device and a flexible gasket-fitted clearance groove structure, the clamping force is adaptively adjusted via a hinged steering mechanism driven by a cylinder. This avoids deformation damage to the wire harness end face caused by rigid extrusion, and ensures high sealing performance of the test air path through the compression of the sealing ring and the guide cavity, effectively eliminating the risk of leakage due to assembly tolerances.

[0022] 3. Convenient air circuit control: The air circuit control unit integrates pressure relief pipelines and valves, and is equipped with an airtight buffer structure to achieve dynamic air pressure balance. This prevents deformation and damage to the harness end face due to excessive pressure difference during negative pressure testing, while also reducing the impact of airflow impact on testing accuracy, ensuring the safety and data repeatability of the testing process.

[0023] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a fixture for testing the airtightness of wire harness end faces.

[0025] Figure 2 This is a structural diagram of a replacement connector.

[0026] The meanings of the labels in the figures are as follows.

[0027] 1. Mounting base 2. Flow guide cavity

[0028] 3 Left conduction control device 4 Right conduction control device

[0029] 5. Left side positioning device 6. Right side positioning device

[0030] 7 Left positioning clip 8 Right positioning clip

[0031] 9 Mounting plate 10 Replacement connector

[0032] 11 Sealing ring 12 Airtight box

[0033] 13 Inlet pipe 14 Outlet pipe

[0034] 15 Control button 16 Pressure relief line

[0035] 17 Cylinders 18 Drive Shaft

[0036] 19 Guide rod 20 Mounting base

[0037] 21 First rotating shaft 22 Traction plate

[0038] 23 Second shaft 24 Third shaft

[0039] 25 Positioning clasp 26 Bearing plate Detailed Implementation

[0040] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0041] like Figures 1 to 2This airtightness testing fixture for wire harness end faces includes a mounting base 1, which is unique in that it contains air chambers and tubing. This allows for air injection or extraction depending on the type of wire harness end face, ensuring that any pre-drilled holes within the end face can be used for either operation. Furthermore, to guide and align the wire harness end face properly with the air chambers and tubing, a connector is installed on the upper part of the mounting base 1. Specifically, the connector has a guide cavity 2, which is connected to the air chambers and tubing. After alignment, the guide cavity 2 aligns with the pre-drilled holes within the wire harness end face. Moreover, to accommodate subsequent testing equipment for left and right air injection or extraction operations, and to support independent or simultaneous left and right operations, a left-side control device 3 and a right-side control device 4 are also installed on the mounting base 1, which connect to the air chambers and tubing. During implementation, to effectively position the wire harness end face and prevent it from detaching during air injection or extraction, a left positioning device 5 and a right positioning device 6 are mirror-mounted on both sides of the mounting base 1. To provide appropriate clamping for the wire harness end face, a left positioning clamp 7 is installed on the left positioning device 5, and a right positioning clamp 8 is installed on the right positioning device 6. Thus, the left positioning clamp 7, right positioning clamp 8, and the replaceable connector 10 of the connector device form a clamping area. Furthermore, the left conduction control device 3 and right conduction control device 4 can be connected to the testing equipment where the testing fixture is located via preset pipelines to obtain the corresponding airtightness parameters. The connection method is conventional and will not be described further here.

[0042] According to a preferred embodiment of this utility model, the connector includes a mounting plate 9 connected to the upper end of the mounting base 1, and positioning bases are distributed on the mounting plate 9. Replaceable connectors 10 are mounted on the positioning bases. This allows for the selection of a suitable replacement connector 10 based on the actual shape of the wire harness end face, eliminating the need to replace the entire connector, thus facilitating maintenance and use. Furthermore, the replacement connector 10 has several guide holes communicating with the positioning bases, forming a flow guiding cavity 2. To ensure airtightness after connection, sealing rings 11 are distributed on the lower edge of the replacement connector 10. This prevents abnormal leakage due to connection tolerances and avoids affecting testing.

[0043] Furthermore, both the left and right conduction control devices include an airtight box 12 connected to the mounting base 1, with the airtight box 12 interfacing with the corresponding air chamber pipeline. This allows for effective planning of the airflow path and provides appropriate buffering using the airtight box 12 to prevent undue impact of airflow on the wire harness end face during conduction. During assembly, an air inlet pipeline 13 is installed on one side of the airtight box 12, and an air outlet pipeline 14 is installed on the other side. Simultaneously, the air inlet pipeline 13 and the air outlet pipeline 14 are connected to the air chamber pipeline. Moreover, considering ease of control during actual use, a conduction control valve (not shown in the figure) is installed between the airtight box 12 and the corresponding air chamber pipeline interface, and a control button 15 is installed on the upper end of the airtight box 12, connected to the conduction control valve. Furthermore, considering the potential for extreme pressure differentials during testing, to prevent damage to the wiring harness due to abnormal deformation caused by negative pressure, a pressure relief pipe 16 is distributed on one side of the airtight box 12. The pressure relief pipe 16 connects to the air chamber pipe, and a pressure relief valve is installed on the pressure relief pipe 16. During implementation, considering the convenience of switching between controllable states and to meet various airflow control requirements such as injection, extraction, and retention, the control valve is either a solenoid valve or a diaphragm valve, and the control button 15 is a push-button switch. The push-button switch is a commercially available product; its structure can be similar to a ballpoint pen refill ejection control mechanism, combined with the control contact. Similarly, the control valve is also a commercially available product, and its structure and function will not be described in detail here.

[0044] In practical implementation, both the left positioning device 5 and the right positioning device 6 include a cylinder 17 connected to the mounting base 1. A steering hinge is mounted on the drive shaft 18 of the cylinder 17, and a guide rod 19 is mounted on the steering hinge. The front end of the guide rod 19 is connected to a corresponding left positioning clamp 7 or right positioning clamp 8. Thus, with the movement of the drive shaft 18 of the cylinder 17, the corresponding left positioning clamp 7 or right positioning clamp 8 can be guided to lift and release and press down and lock, satisfying the limit of the wire harness end face for retrieval and testing.

[0045] Specifically, the steering hinge includes a mounting base 20 screwed to the cylinder 17. The mounting base 20 is connected to paired traction plates 22 via a first rotating shaft 21, satisfying steering and auxiliary positioning requirements. Simultaneously, the traction plates 22 are connected to corresponding guide rods 19 via a second rotating shaft 23, and the drive shaft 18 of the cylinder 17 is movably connected to the tail of the guide rod 19 via a third rotating shaft 24. This allows the guide rod 19 to be raised and lowered around the second rotating shaft 23. Furthermore, positioning retaining rings 25 are installed on the outer sides of the first rotating shaft 21, second rotating shaft 23, and third rotating shaft 24. This provides appropriate restraint on the outer sides of the corresponding shafts, preventing accidental disengagement without affecting rotation.

[0046] Looking further, the left positioning clip 7 and right positioning clip 8, facing the replacement connector 10 of the connector device, have clearance grooves to avoid improper compression of any cut edges on the wire harness end face. Simultaneously, to ensure adequate flexible contact and prevent damage to the external wrapping of the wire harness end face, a flexible gasket can be fitted within the clearance groove. During installation, a silicone sheet is preferred to form the flexible gasket.

[0047] Meanwhile, considering the stability of the installation and to prevent unnecessary loosening of the connection during the operation of the left positioning device 5 and the right positioning device 6, this utility model has bearing plates 26 installed on both sides of the mounting base 1. The lower ends of the left positioning device 5 and the right positioning device 6 are connected to the corresponding bearing plates 26.

[0048] Example 1

[0049] Conduct an inflatable airtightness test.

[0050] The user aligns the end face of the wire harness with the replaceable connector 10. Then, the left positioning device 5 and the right positioning device 6 are activated, and the corresponding left positioning clamp 7 and right positioning clamp 8 are used to limit the end face of the wire harness.

[0051] The left conduction control device 3 and the right conduction control device 4 are both normally closed by default. Then, the left conduction control device 3 is activated, allowing an external air pump to pressurize the air chamber pipe through the corresponding pipeline. Subsequently, the wire harness end face is pressurized through the replacement connector 10.

[0052] Next, the corresponding inflation value is obtained through the testing equipment where the testing fixture is located, and airtightness data is collected.

[0053] Example 2

[0054] Perform air extraction and negative pressure airtightness tests.

[0055] The user aligns the end face of the wire harness with the replaceable connector 10. Then, the left positioning device 5 and the right positioning device 6 are activated to limit the position of the end face of the wire harness.

[0056] Open the normally closed right-hand conduction control device 4 to activate it. This allows external negative pressure equipment to evacuate the air chamber pipeline through the corresponding pipe. Subsequently, negative pressure is applied to the wire harness end face through the replacement connector 10.

[0057] Next, the corresponding negative pressure value is obtained through the testing equipment where the testing fixture is located, and airtightness data is collected.

[0058] Furthermore, the directions or positional relationships described in this utility model are based on the directions or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or structure referred to must have a specific orientation, or to operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixture for testing the airtightness of wire harness end faces, comprising a mounting base, characterized in that: The mounting base contains air chamber pipelines, and a connector is installed at the upper end of the mounting base. The connector has a flow guide cavity, which is connected to the air chamber pipeline. The mounting base is also equipped with a left conduction control device and a right conduction control device, which are connected to the air chamber pipeline. The mounting base is mirror-mounted with a left positioning device and a right positioning device on both sides. The left positioning device is equipped with a left positioning clamp, and the right positioning device is equipped with a right positioning clamp. The left and right positioning clamps and the connector form a clamping area.

2. The airtightness testing fixture for wire harness end faces according to claim 1, characterized in that: The connector includes a mounting plate connected to the upper end of the mounting base. Positioning bases are distributed on the mounting plate. Replaceable connectors are installed on the positioning bases. A plurality of guide holes communicating with the positioning bases are distributed on the replaceable connectors, and the guide holes form a flow guiding cavity.

3. The airtightness testing fixture for wire harness end faces according to claim 2, characterized in that: The lower edge of the replacement connector is provided with sealing rings.

4. The airtightness testing fixture for wire harness end faces according to claim 1, characterized in that: Both the left and right conduction control devices include an airtight box connected to the mounting base, and the airtight box is connected to the corresponding air chamber pipeline. An air inlet pipeline is installed on one side of the airtight box, and an air outlet pipeline is installed on the other side of the airtight box. The air inlet and outlet pipelines are connected to the air chamber pipelines. A conduction control valve is installed between the airtight box and the corresponding air chamber pipeline interface. A control button is installed on the upper end of the airtight box, and the control button is connected to the conduction control valve. A pressure relief pipeline is also distributed on one side of the airtight box, and the pressure relief pipeline is connected to the air chamber pipeline. A pressure relief valve is installed on the pressure relief pipeline.

5. The airtightness testing fixture for wire harness end faces according to claim 4, characterized in that: The conduction control valve is a solenoid valve or a diaphragm valve, and the control button is a push-button toggle switch.

6. The airtightness testing fixture for wire harness end faces according to claim 1, characterized in that: Both the left and right positioning devices include a cylinder connected to the mounting base. A steering hinge is mounted on the drive shaft of the cylinder, and a guide rod is mounted on the steering hinge. The front end of the guide rod is connected to a corresponding left or right positioning clamp.

7. The airtightness testing fixture for wire harness end faces according to claim 6, characterized in that: The steering hinge includes a mounting base connected to a cylinder screw. The mounting base is connected to a pair of traction plates via a first rotating shaft. The traction plates are connected to corresponding guide rods via a second rotating shaft. The drive shaft of the cylinder is movably connected to the tail of the guide rod via a third rotating shaft. Positioning rings are installed on the outer sides of the first, second, and third rotating shafts.

8. The airtightness testing fixture for wire harness end faces according to claim 1, characterized in that: The left and right positioning clips are provided with clearance grooves facing the insertion device, and a flexible gasket is attached to the clearance groove.

9. The airtightness testing fixture for wire harness end faces according to claim 1, characterized in that: The mounting base has bearing plates installed on both sides, and the lower ends of the left and right positioning devices are connected to the corresponding bearing plates.

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