Automobile high-voltage wire harness airtightness detection jig

Abstract

The application relates to the technical field of wire harness detection, and discloses an automobile high-voltage wire harness air-tightness detection jig, which comprises a bottom plate and a top plate, the upper surface of the bottom plate is fixedly provided with a lower jig, the lower surface of the top plate is provided with an upper jig, and the mutually close surfaces of the lower jig and the upper jig are both provided with detection cavities. The automobile high-voltage wire harness air-tightness detection jig is provided with cable placing grooves with diameters gradually increasing and semicircular cross sections on the lower jig and the upper jig, and is matched with removable rubber sealing columns, so that air-tightness detection of wire harnesses with different diameters is realized, the whole jig or the detection cavity module does not need to be replaced, the labor intensity of operators is reduced, and the detection efficiency is improved. The end, away from the lower jig, of each rubber sealing column is fixedly connected with a fixing ring, an annular groove and a sliding groove are formed in the outer surface of the fixing ring, the rubber sealing column is limited, axial displacement of the rubber sealing column is prevented, the capacity space in the detection cavity is prevented from being reduced or increased, and the sealing performance of the detection cavity and the accuracy of detection results are ensured.

Description

Technical Field

[0001] This application relates to the field of wiring harness testing technology, specifically to a gas tightness testing fixture for automotive high-voltage wiring harnesses. Background Technology

[0002] Currently, existing high-voltage wire harness airtightness testing fixtures typically place one end of the cable inside the testing chamber of the fixture during the testing process, and then press down on the fixture to seal the testing chamber. To prevent the cable from being excessively squeezed and damaged during the testing process, a groove adapted to the cable diameter is opened on the surface of the fixture, and a sealing gasket is installed inside the groove. This can protect the cable to a certain extent and ensure the airtightness of the testing chamber.

[0003] However, with the continuous development of the automotive industry, the specifications and sizes of automotive high-voltage wiring harnesses are becoming increasingly diverse. Different models of automobiles may use high-voltage wiring harnesses of different diameters. When it is necessary to test cables of different sizes, it is often necessary to replace the entire fixture or the internal testing chamber module of the fixture. Replacing the entire fixture is not only costly, but also occupies a lot of storage space. At the same time, frequent fixture replacements also increase the labor intensity of operators and testing time, and reduce testing efficiency.

[0004] However, the testing environment of existing testing devices often follows the ambient temperature. During the testing process, the ambient temperature is unstable. Therefore, when testing air tightness, the measured air pressure data will be affected by temperature fluctuations, thus affecting the accuracy and reliability of the test results. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides an automotive high-voltage wiring harness airtightness testing fixture, which has the advantages of high applicability and solves the problems mentioned in the background technology.

[0006] To achieve the above objectives, this application provides the following technical solution: a gas tightness testing fixture for automotive high-voltage wiring harnesses, comprising a base plate and a top plate, wherein a lower fixture is fixedly installed on the upper surface of the base plate, and an upper fixture is provided below the top plate, and a testing cavity is provided on the side of the lower fixture and the upper fixture that are close to each other. Both the lower fixture and the upper fixture have cable placement slots on one side that extend to the corresponding detection cavity. Each cable placement slot has a semi-circular cross-section, and the diameter of each cable placement slot increases sequentially. Each lower cable placement slot has a rubber sealing post inside. One side of the lower fixture is provided with a connecting pipe that is fixedly connected to the corresponding detection cavity. One end of the connecting pipe is equipped with a one-way valve. A pressure sensor is installed on one side of the lower fixture, and the detection end of the pressure sensor is located inside the corresponding detection cavity. The top plate is equipped with a drive mechanism for driving the upper fixture and the lower fixture to close.

[0007] Furthermore, an environmental control mechanism is provided above the upper fixture; The environmental control mechanism includes a control tube, the bottom end of which is fixedly connected to the detection cavity of the upper fixture, and the middle part of which is fixedly connected to a processing box. Heaters are installed on the inner top wall and inner bottom wall of the processing box. A semiconductor cooling chip is installed on one side of the processing box. A set of transfer fins is installed on both the cooling surface and the heating surface of the semiconductor cooling chip. The cooling surface of the semiconductor cooling chip is located inside the processing box, and the two sets of transfer fins are located inside and outside the processing box, respectively. A fixing plate is installed on one side of the processing box, and a cooling fan for dissipating heat from the heat transfer fins located outside the processing box is installed at one end of the fixing plate.

[0008] The above solution allows for adjustment of the temperature inside the detection chamber according to testing requirements, maintaining a stable ambient temperature and preventing temperature fluctuations from interfering with the air pressure data in the test results, thereby improving the accuracy and reliability of the test results.

[0009] Furthermore, the top end of the control tube is fixedly connected to the output end of an external air pump, and a first solenoid valve is installed at the bottom end of the control tube.

[0010] The above solution enables precise delivery of gas into the testing chamber using an air pump, allowing for flexible adjustment of the air pressure within the chamber. During the testing process, the amount of gas entering the testing chamber can be precisely controlled by adjusting parameters such as the start / stop and output power of the air pump, according to the air tightness testing requirements of different wire harnesses. This creates an air pressure environment that meets testing standards, ensuring the accuracy and reliability of the air tightness test.

[0011] Furthermore, the detection chamber located at the bottom is provided with an exhaust valve that is fixedly connected to it. A first solenoid valve is installed inside the exhaust valve. A temperature sensor is provided on one side of the detection chamber. The temperature sensor is fixedly installed with the lower fixture, and the detection end of the temperature sensor is fixedly connected to the detection chamber.

[0012] The above scheme enables real-time monitoring of the temperature inside the detection chamber, and based on the data fed back by the temperature sensor, the temperature inside the detection chamber is precisely adjusted by the environmental regulation mechanism to ensure a stable detection environment temperature.

[0013] Furthermore, the driving mechanism includes a cylinder, which is vertically mounted to the top plate, and the output end of the cylinder is fixedly connected to the upper surface of the upper fixture.

[0014] The above scheme can precisely control the up-and-down movement of the upper fixture, achieving accurate closure and separation of the upper and lower fixtures, and ensuring the smooth progress of the testing process.

[0015] Furthermore, a set of guide sleeve rods is installed between the upper fixture and the top plate.

[0016] The above scheme can provide guidance for the up-and-down movement of the upper fixture, prevent the upper fixture from shifting during the movement, ensure accurate alignment between the upper and lower fixtures, and improve the accuracy of the inspection.

[0017] Furthermore, a set of positioning pins arranged in a matrix are installed at the bottom of the upper fixture, and a set of positioning holes arranged in a matrix are opened on the upper surface of the lower fixture.

[0018] The above solution can further ensure the accurate alignment of the upper and lower fixtures when closed, improve the sealing of the detection cavity, and ensure the accuracy of the detection results.

[0019] Furthermore, each of the cable placement slots is fixedly connected to a matching sealing gasket.

[0020] The above solution can better protect the cable, prevent it from being damaged by excessive compression during the testing process, and further improve the airtightness of the testing chamber.

[0021] Furthermore, each of the rubber sealing posts is fixedly connected to a fixing ring at the end away from the lower fixture, and an annular groove is provided on the outer surface of each fixing ring. A sliding groove is provided at one end of each annular groove, and a set of locking rods is fixedly connected to the outer surface of the lower fixture.

[0022] With the above solution, when the locking rod is located in the cable placement groove, the locking rod is rotated along the annular groove by rotating the fixing ring, thereby limiting the rubber sealing column, preventing its axial displacement, avoiding reducing or increasing the internal capacity space of the detection cavity, and ensuring the sealing of the detection cavity and the accuracy of the detection results.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial effects: This automotive high-voltage wiring harness airtightness testing fixture features cable placement slots with progressively increasing diameters and semi-circular cross-sections on both the lower and upper fixtures. Combined with removable rubber sealing posts, it enables airtightness testing of wiring harnesses of different diameters without requiring replacement of the entire fixture or testing chamber module. This reduces costs, lessens the workload for operators, and improves testing efficiency. Each rubber sealing post has a fixed ring at the end furthest from the lower fixture. The outer surface of the fixed ring has an annular groove and a sliding groove. By aligning a locking rod with the sliding groove and rotating the fixed ring, the locking rod rotates along the annular groove, limiting the rubber sealing post and preventing axial displacement. This avoids reducing or increasing the internal capacity of the testing chamber, ensuring the airtightness of the testing chamber and the accuracy of the testing results.

[0024] An environmental control mechanism is installed to adjust the temperature inside the testing chamber according to testing requirements, keeping the testing environment temperature stable and avoiding interference from temperature fluctuations on the air pressure data in the test results, thereby improving the accuracy and reliability of the test results. During the testing process, the rubber sealing column that is not removed can fill the gap between the cable placement slot and the wire harness, ensuring the airtightness of the testing chamber. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application; Figure 2 This is a front view of the overall structure of this application; Figure 3 This is a structural diagram of the fixture used in this application; Figure 4 This is a structural diagram of the cable placement channel in this application; Figure 5 This is a structural diagram of the fixed ring in this application; Figure 6 This is a structural diagram of the environmental control mechanism in this application; Figure 7 This is a cross-sectional view of the environmental control mechanism structure in this application.

[0026] In the picture: 1. Base plate; 2. Top plate; 3. Lower jig; 4. Upper jig; 5. Cable tray; 6. Connecting pipe; 7. Check valve; 8. Pressure sensor; 9. Drive mechanism; 901. Cylinder; 902. Guide sleeve rod; 903. Positioning pin; 904. Positioning hole; 10. Rubber sealing column; 11. Environmental control mechanism; 1101. Control pipe; 1102. Processing box; 1103. Heater; 1104. Semiconductor cooling chip; 1105. Transfer fins; 1106. Fixing plate; 1107. Cooling fan; 1108. Second solenoid valve; 12. Exhaust valve; 13. First solenoid valve; 14. Temperature sensor; 15. Sealing gasket; 16. Retaining ring; 17. Annular groove; 18. Slide groove; 19. Locking rod. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Please see Figures 1-7This embodiment of an automotive high-voltage wiring harness airtightness testing fixture includes a base plate 1 and a top plate 2. A lower fixture 3 is fixedly installed on the upper surface of the base plate 1, and an upper fixture 4 is provided below the top plate 2. Both the lower fixture 3 and the upper fixture 4 have testing cavities on their sides that are close to each other.

[0029] Both the lower fixture 3 and the upper fixture 4 have cable placement slots 5 extending through to the corresponding detection chamber on one side. Each cable placement slot 5 has a semi-circular cross-section, with the diameter of each slot increasing sequentially. This allows for airtightness testing of wire harnesses of different diameters without requiring replacement of the entire fixture or detection chamber module, reducing costs, alleviating operator workload, and improving testing efficiency. Each lower cable placement slot 5 contains a rubber sealing post 10. When testing wire harnesses of different sizes, the corresponding rubber sealing post 10 is removed, and the cable is placed inside. During testing, the remaining rubber sealing posts 10 fill the gap between the cable placement slot 5 and the wire harness, ensuring the airtightness of the detection chamber. Each cable placement slot 5 also has a matching sealing gasket 15 fixedly connected inside, which better protects the cable and prevents it from being excessively squeezed and damaged during testing, further improving the airtightness of the detection chamber.

[0030] Each rubber sealing post 10 has a fixed ring 16 fixedly connected to the end away from the lower fixture 3. Each fixed ring 16 has an annular groove 17 on its outer surface and a sliding groove 18 at one end of each annular groove 17. A set of locking rods 19 are fixedly connected to the outer surface of the lower fixture 3. By aligning the locking rods 19 with the sliding grooves 18, when the locking rods 19 are located in the cable placement groove 5, the fixed ring 16 is rotated to make the locking rods 19 rotate along the annular grooves 17, thereby limiting the rubber sealing post 10, preventing its axial displacement, avoiding reducing or increasing the internal capacity of the detection cavity, and ensuring the sealing of the detection cavity and the accuracy of the detection results.

[0031] A connecting pipe 6 is provided on one side of the lower fixture 3 and is fixedly connected to the corresponding detection chamber. A one-way valve 7 is installed at one end of the connecting pipe 6. The connecting pipe 6 is fixedly connected to the air supply end of the external air tightness tester. A pressure sensor 8 is installed on one side of the lower fixture 3. The detection end of the pressure sensor 8 is located inside the corresponding detection chamber.

[0032] The top plate 2 is equipped with a drive mechanism 9 for driving the upper fixture 4 and the lower fixture 3 to close. The drive mechanism 9 includes a cylinder 901, which is installed vertically to the top plate 2. The output end of the cylinder 901 is fixedly connected to the upper surface of the upper fixture 4, which can accurately control the up and down movement of the upper fixture 4, realize the accurate closing and separation of the upper fixture 4 and the lower fixture 3, and ensure the smooth progress of the testing process.

[0033] The drive mechanism 9 also includes a set of guide sleeve rods 902 installed between the upper fixture 4 and the top plate 2, which can provide guidance for the up and down movement of the upper fixture 4, prevent the upper fixture 4 from deviating during the movement, ensure the accurate alignment of the upper fixture 4 and the lower fixture 3, and improve the accuracy of the detection. The drive mechanism 9 also includes a set of positioning pins 903 arranged in a matrix at the bottom of the upper fixture 4, and a set of positioning holes 904 arranged in a matrix on the upper surface of the lower fixture 3, which can further ensure the accurate alignment of the upper fixture 4 and the lower fixture 3 when closed, improve the sealing of the detection cavity, and ensure the accuracy of the detection results.

[0034] An environmental control mechanism 11 is provided above the upper fixture 4. The environmental control mechanism 11 includes a control tube 1101. The bottom end of the control tube 1101 is fixedly connected to the detection cavity of the upper fixture 4. The middle part of the control tube 1101 is fixedly connected to a processing box 1102. Heaters 1103 are installed on the inner top and bottom walls of the processing box 1102. The heaters 1103 are specifically electric heating wire modules. A semiconductor cooling chip 1104 is installed on one side of the processing box 1102. A set of transfer fins 1105 are installed on both the cooling and heating surfaces of the semiconductor cooling chip 1104. The cooling surface of the bulk cooler 1104 is located inside the processing chamber 1102. Two sets of transfer fins 1105 are located inside and outside the processing chamber 1102, respectively. A fixing plate 1106 is installed on one side of the processing chamber 1102. A cooling fan 1107 is installed at one end of the fixing plate 1106 to dissipate heat from the transfer fins 1105 located outside the processing chamber 1102. This fan can adjust the temperature inside the detection chamber according to the detection requirements, keep the detection environment temperature stable, avoid temperature fluctuations from interfering with the air pressure data in the detection results, and improve the accuracy and reliability of the detection results.

[0035] The top end of the control tube 1101 is fixedly connected to the output end of an external air pump, and the bottom end of the control tube 1101 is equipped with a first solenoid valve 13, which can accurately deliver gas into the detection chamber with the help of the air pump, thereby realizing flexible adjustment of the air pressure in the detection chamber. During the detection process, according to the requirements of different wire harness air tightness detection, the amount of gas entering the detection chamber can be precisely controlled by controlling parameters such as the start and stop of the air pump and the output power, thereby creating an air pressure environment that meets the detection standards and ensuring the accuracy and reliability of air tightness detection.

[0036] The detection chamber at the bottom is equipped with an exhaust valve 12 that is fixedly connected to it. The exhaust valve 12 has a first solenoid valve 13 installed inside. A temperature sensor 14 is provided on one side of the detection chamber. The temperature sensor 14 is fixedly installed with the lower fixture 3. The detection end of the temperature sensor 14 is fixedly connected to the detection chamber, which can monitor the temperature inside the detection chamber in real time. Based on the data fed back by the temperature sensor 14, the temperature inside the detection chamber is precisely adjusted by the environmental adjustment mechanism 11 to ensure the stability of the detection environment temperature.

[0037] The working principle of the above embodiment is as follows: Select a suitable cable placement groove 5 according to the diameter of the high-voltage wiring harness of the car to be tested, and remove the corresponding rubber sealing post 10. Since the lower fixture 3 and the upper fixture 4 are both provided with cable placement grooves 5 that penetrate to the corresponding testing cavity, and the cross-section of each cable placement groove 5 is semi-circular with the diameter increasing in sequence, it can adapt to wiring harnesses of different diameters.

[0038] The high-voltage wiring harness of the vehicle to be tested is placed in the cable placement slot 5 corresponding to the lower fixture 3. At this time, the sealing gasket 15 in the cable placement slot 5 can protect the cable and prevent it from being damaged by excessive compression during the test. At the same time, it further improves the airtightness of the test chamber. The top plate 2 is equipped with a drive mechanism 9 for driving the upper fixture 4 and the lower fixture 3 to close. The cylinder 901 of the drive mechanism 9 is installed vertically to the top plate 2. The output end of the cylinder 901 is fixedly connected to the upper surface of the upper fixture 4. When the cylinder 901 is started, the output end of the cylinder 901 pushes the upper fixture 4 to move downward.

[0039] A set of guide sleeve rods 902 is installed between the upper fixture 4 and the top plate 2 to guide the upper fixture 4 to move up and down and prevent the upper fixture 4 from deviating during the movement. A set of positioning pins 903 arranged in a matrix is ​​installed at the bottom of the upper fixture 4. A set of positioning holes 904 arranged in a matrix are opened on the upper surface of the lower fixture 3. When the upper fixture 4 moves down, the positioning pins 903 are inserted into the positioning holes 904 to further ensure the accurate alignment of the upper fixture 4 and the lower fixture 3 when closed, improve the sealing of the detection cavity, and ensure the accuracy of the detection results.

[0040] A temperature sensor 14 is installed on one side of the detection chamber. The temperature sensor 14 is fixedly installed with the lower fixture 3, and its detection end is fixedly connected to the detection chamber, which can monitor the temperature inside the detection chamber in real time. An environmental adjustment mechanism 11 is installed above the upper fixture 4. When the temperature sensor 14 indicates that the temperature inside the detection chamber does not meet the detection requirements, the heater 1103 or the semiconductor cooling chip 1104 is activated as needed. Heat is transferred through the transfer fins 1105 to heat or cool the air inside the processing box 1102. When adjusting the temperature, the first solenoid valve 13 and the second solenoid valve 1108 are opened accordingly. After the adjustment is completed, they are closed to ensure the sealing of the detection chamber.

[0041] During testing, a connecting pipe 6 is fixedly connected to the corresponding testing chamber on one side of the lower fixture 3. A one-way valve 7 is installed at one end of the connecting pipe 6. The connecting pipe 6 is fixedly connected to the air supply end of the external air tightness tester. A pressure sensor 8 is installed on one side of the lower fixture 3. The detection end of the pressure sensor 8 is located inside the corresponding testing chamber. As gas enters the testing chamber, the air pressure inside the testing chamber changes. The pressure sensor 8 detects the pressure inside the testing chamber in real time and transmits the data to the air tightness tester. The air tightness of the wire harness is determined by analyzing the pressure change.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas tightness testing fixture for automotive high-voltage wiring harnesses, comprising a base plate (1) and a top plate (2), characterized in that: The lower fixture (3) is fixedly installed on the upper surface of the base plate (1), and the upper fixture (4) is provided below the top plate (2). The lower fixture (3) and the upper fixture (4) are both provided with detection cavities on the side that is close to each other. The lower fixture (3) and the upper fixture (4) each have a cable placement groove (5) that extends through to the corresponding detection cavity on one side. The cross-section of each cable placement groove (5) is semi-circular, and the diameter of the cable placement groove (5) increases sequentially. Each lower cable placement groove (5) has a rubber sealing column (10) placed inside. The lower fixture (3) has a connecting pipe (6) fixedly connected to the corresponding detection cavity on one side. A one-way valve (7) is installed at one end of the connecting pipe (6). A pressure sensor (8) is installed on one side of the lower fixture (3). The detection end of the pressure sensor (8) is located inside the corresponding detection cavity. The top plate (2) is equipped with a drive mechanism (9) for driving the upper fixture (4) and the lower fixture (3) to close.

2. The automotive high-voltage wiring harness airtightness testing fixture according to claim 1, characterized in that: An environmental control mechanism (11) is provided above the upper fixture (4); The environmental control mechanism (11) includes a control tube (1101), the bottom end of which is fixedly connected to the detection cavity of the upper fixture (4), and the middle part of the control tube (1101) is fixedly connected to a processing box (1102). Heaters (1103) are installed on the inner top wall and inner bottom wall of the processing box (1102). A semiconductor cooling chip (1104) is installed on one side of the processing box (1102). A set of transfer fins (1105) are installed on both the cooling surface and the heating surface of the semiconductor cooling chip (1104). The cooling surface of the semiconductor cooling chip (1104) is located inside the processing box (1102), and the two sets of transfer fins (1105) are located inside and outside the processing box (1102), respectively. A fixing plate (1106) is installed on one side of the processing box (1102), and a cooling fan (1107) is installed at one end of the fixing plate (1106) for dissipating heat from the transfer fins (1105) located outside the processing box (1102).

3. The automotive high-voltage wiring harness airtightness testing fixture according to claim 2, characterized in that: The top end of the control tube (1101) is fixedly connected to the output end of the external air pump, and the bottom end of the control tube (1101) is equipped with a first solenoid valve (13).

4. The automotive high-voltage wiring harness airtightness testing fixture according to claim 2, characterized in that: The detection chamber located at the bottom is provided with an exhaust valve (12) that is fixedly connected to it. A first solenoid valve (13) is installed inside the exhaust valve (12). A temperature sensor (14) is provided on one side of the detection chamber. The temperature sensor (14) is fixedly installed with the lower fixture (3). The detection end of the temperature sensor (14) is fixedly connected to the detection chamber.

5. The automotive high-voltage wiring harness airtightness testing fixture according to claim 1, characterized in that: The drive mechanism (9) includes a cylinder (901), which is vertically mounted on the top plate (2), and the output end of the cylinder (901) is fixedly connected to the upper surface of the upper fixture (4).

6. The automotive high-voltage wiring harness airtightness testing fixture according to claim 5, characterized in that: The drive mechanism (9) also includes a set of guide sleeve rods (902) installed between the upper fixture (4) and the top plate (2).

7. The automotive high-voltage wiring harness airtightness testing fixture according to claim 5, characterized in that: The drive mechanism (9) also includes a set of positioning pins (903) arranged in a matrix at the bottom of the upper fixture (4), and a set of positioning holes (904) arranged in a matrix on the upper surface of the lower fixture (3).

8. The automotive high-voltage wiring harness airtightness testing fixture according to claim 1, characterized in that: Each of the cable placement slots (5) is fixedly connected to a matching sealing gasket (15).

9. The automotive high-voltage wiring harness airtightness testing fixture according to claim 1, characterized in that: Each of the rubber sealing posts (10) is fixedly connected to a fixing ring (16) at the end away from the lower fixture (3). Each fixing ring (16) has an annular groove (17) on its outer surface. Each annular groove (17) has a sliding groove (18) at one end. A set of locking rods (19) is fixedly connected to the outer surface of the lower fixture (3).

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