A fixture for testing the airtightness of a lidar unit

Abstract

This utility model relates to the field of lidar detection technology, and more particularly to a fixture for testing the airtightness of a lidar unit. It includes a base, with support columns fixed to the four corners of the base's top. A mounting platform is provided on the top of the four support columns. A hydraulic cylinder is fixedly mounted in the middle of the mounting platform via a first mounting plate. A connecting plate is provided at the end of the movable rod of the hydraulic cylinder. The fixture, through a sealed detection chamber composed of an upper and lower mold, combined with an air inlet for gas pressure testing, can accurately determine whether the lidar has leakage problems, significantly improving the accuracy and reliability of airtightness testing. Furthermore, the fixture includes a sealing structure composed of a sealing cover, a connecting seat, a fixing seat, and an elastic element, which can effectively seal easily leaking parts such as the connection ports on the lidar, preventing gas from entering due to lack of sealing at the interface and thus avoiding misjudgments.

Description

Technical Field

[0001] This utility model relates to the field of lidar detection technology, and in particular to a fixture for testing the airtightness of a lidar unit. Background Technology

[0002] With the widespread application of LiDAR in fields such as intelligent driving, robot navigation, and 3D modeling, the environmental adaptability and long-term operational reliability of the entire device have become important indicators for evaluating product performance. Among them, the airtightness of LiDAR directly affects its stability and service life in complex environments. If its shell is not sealed properly, impurities such as moisture and dust may enter, which may affect the normal operation of the internal optical system and electronic components, or even cause equipment failure. Therefore, LiDAR must undergo strict airtightness testing before leaving the factory to ensure that it meets the relevant protection level requirements.

[0003] Currently, common airtightness testing methods mainly include water immersion and pressure decay methods. While water immersion is intuitive, it is cumbersome to operate and carries the risk of secondary contamination or damage to the tested product. Pressure decay methods, on the other hand, determine leakage by detecting changes in pressure inside the sealed cavity, making them relatively simple to operate. However, they still have shortcomings in the testing process. Because lidar contains multiple interface structures, some existing testing fixtures often cannot effectively seal the interface areas, allowing gas to enter during testing, thus affecting the accuracy of the testing and the results.

[0004] Therefore, there is an urgent need to provide a fixture for testing the airtightness of the entire lidar system that can reliably seal the lidar interface and ensure the accuracy of the detection and the results. Utility Model Content

[0005] To overcome the shortcomings of existing testing fixtures that lack sealing of the lidar interface, leading to gas ingress during testing and affecting the accuracy of testing and results, this utility model provides a lidar airtightness testing fixture that can reliably seal the lidar interface, ensuring testing accuracy and results.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: a fixture for testing the airtightness of a laser radar unit, comprising a base, with support columns fixedly connected to the four corners of the base's top, and a mounting platform shared by the four support columns. A hydraulic cylinder is fixedly mounted at the center of the mounting platform via a first mounting plate. A connecting plate is provided at the end of the movable rod of the hydraulic cylinder, and an upper mold base is fixedly mounted on the connecting plate. Guide seats are fixedly connected to both sides of the upper mold base. Symmetrically distributed guide rods are fixedly connected to the top of the base, and the guide rods are slidably sleeved with the guide seats. A hydraulic cylinder is fixedly mounted at the center of the top of the base via a first mounting plate. The second mounting plate is fixedly mounted with a lower mold base. The upper mold base and the lower mold base are respectively fitted with a lower mold and an upper mold. The top of the upper mold has an air inlet. The lower mold contains a laser radar. The front side of the laser radar has a connection port. The connection port is covered with a sealing cover. A connecting seat is fixedly connected to the sealing cover. A first elastic element connects the connecting seat and the lower mold. The lower mold has symmetrically distributed fixed seats that slide in a sliding manner. The fixed seats can slide in the horizontal direction and are inserted into the side of the connecting seat. A second elastic element connects the fixed seats and the lower mold.

[0007] Optionally, both the upper mold base and the lower mold base are fixedly connected to the front side with symmetrically distributed fixing rods, and a rotating fixing block is rotatably provided on the fixing rod, the rotating fixing block rotating about the fixing rod.

[0008] Optionally, the lower mold has placement slots at the four corners of its top, and each placement slot has a detachable fixing component inside. The upper mold has embedded protrusions at the four corners of its top.

[0009] Optionally, one end of the fixing member has an L-shaped structure that matches the contour of the lidar corner, and its surface is provided with a rubber block.

[0010] Optionally, a wedge-shaped connecting rod is slidably provided in the lower part of the lower mold. One end of the wedge-shaped connecting rod extends outward and is fixedly connected to a pressing block. A return spring is also sleeved on the wedge-shaped connecting rod. The two ends of the return spring are respectively connected to the lower mold and the pressing block. A wedge-shaped top rod is slidably provided in the center position inside the lower mold. The bottom end of the wedge-shaped top rod contacts and engages with the inclined surface of the wedge-shaped connecting rod. A top seat is fixedly connected to the top end of the wedge-shaped top rod.

[0011] Optionally, the top of the connecting seat is provided with a first groove, and the top of the fixing seat is provided with a second groove.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. The tooling, by setting up a sealed detection cavity composed of an upper mold and a lower mold, combined with an air inlet for gas pressure detection, can accurately determine whether there is a leakage problem in the lidar, which significantly improves the accuracy and reliability of airtightness detection. In addition, the tooling is provided with a sealing structure composed of a sealing cover, a connecting seat, a fixing seat and an elastic element, which can effectively seal the easily leaking parts such as the connection port on the lidar, and avoid the problem of misjudgment caused by gas entering from the part due to the lack of sealing of the interface.

[0013] 2. By setting up a rotating fixing block structure, the rotating fixing block can be manually rotated from a vertical state to a horizontal state to limit and fix the upper and lower molds, effectively preventing the molds from shifting or misaligning during the inspection process, ensuring a tight fit between the mold and the mold base, and improving the stability and safety of the inspection process.

[0014] 3. The tooling is equipped with replaceable L-shaped fasteners, which can be selected according to the shape and structural characteristics of the lidar and embedded into the corresponding placement slot. The L-shaped end cooperates with the rubber block to effectively press and fix the lidar corners, preventing it from shifting or tilting during the detection process. This ensures the stability of the lidar, avoids damage to the shell, and improves the safety and applicability of the detection. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural cross-sectional view of the installation platform, upper mold base, and lower mold base of this utility model.

[0017] Figure 3 This is an exploded view of the lower mold, upper mold, and fixing component of this utility model.

[0018] Figure 4 This is an exploded view of the pressing block, wedge-shaped connecting rod, and return spring of this utility model.

[0019] Figure 5 This is a three-dimensional structural cross-sectional view of the upper mold, laser radar, and pressing block of this utility model.

[0020] Figure 6 This is an exploded view of the sealing cover, connecting seat, and fixing seat of this utility model.

[0021] The markings in the attached diagram are as follows: 1: Base, 2: Support column, 3: Mounting platform, 4: First mounting plate, 5: Hydraulic cylinder, 6: Connecting plate, 7: Upper mold base, 8: Guide seat, 9: Guide rod, 10: Second mounting plate, 11: Lower mold base, 12: Fixing rod, 13: Rotating fixing block, 14: Lower mold, 15: Upper mold, 16: LiDAR, 17: Connection port, 18: Fixing component, 19: Rubber block, 20: Placement groove, 21: Embedded protrusion, 22: Pressing block, 23: Wedge-shaped connecting rod, 24: Return spring, 25: Wedge-shaped top rod, 26: Top seat, 27: Sealing cover, 28: Connecting seat, 29: First groove, 30: First elastic element, 31: Fixing seat, 32: Second groove, 33: Second elastic element, 34: Air inlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6A fixture for testing the airtightness of a lidar unit includes a base 1. Support columns 2 are fixedly connected to the four corners of the top of the base 1. A mounting platform 3 is provided on the top of the four support columns 2. A hydraulic cylinder 5 is fixedly mounted on the middle of the mounting platform 3 via a first mounting plate 4. A connecting plate 6 is provided at the end of the movable rod of the hydraulic cylinder 5. An upper mold base 7 is fixedly mounted on the connecting plate 6. Guide seats 8 are fixedly connected to the left and right sides of the upper mold base 7. Guide rods 9, symmetrically distributed on both sides, are fixedly connected to the top of the base 1. The guide rods 9 are slidably sleeved with the guide seats 8 to guide the upper mold base 7 to move smoothly in the vertical direction, ensuring the mold closing accuracy of the upper and lower molds 14. A lower mold base 11 is fixedly mounted on the middle of the top of the base 1 via a second mounting plate 10. A lower mold 14 and an upper mold 15 are respectively fitted into the upper mold base 7 and the lower mold base 11. An air inlet 34 is provided on the top of the upper mold 15 for injecting detection gas into the mold cavity. A lidar unit is placed inside the lower mold 14. 16. The lidar 16 has a connection port 17 on its front side. A sealing cover 27 is provided on the connection port 17. A connecting seat 28 is fixedly connected to the sealing cover 27. A first groove 29 is provided on the top of the connecting seat 28. A first elastic element 30 is connected between the connecting seat 28 and the lower mold 14 to provide a reset force and maintain the initial position of the sealing cover 27 in the non-operational state. The lower mold 14 has symmetrically distributed fixing seats 31 that slide in the middle. The fixing seats 31 can slide in the horizontal direction and are inserted into the side of the connecting seat 28 to fix the sealing cover 27 in the sealed position. A second groove 32 is provided on the top of the fixing seat 31. The design of the first groove 29 and the second groove 32 provides a recessed structure that facilitates finger force application, so as to quickly complete the insertion and separation operation, significantly improving the convenience and efficiency of operation. A second elastic element 33 is connected between the fixing seat 31 and the lower mold 14 to reset the fixing seat 31 in the non-operational state.

[0024] When the lidar 16 needs to be tested for air tightness, firstly, the lower mold 14 and the upper mold 15 are installed into the lower mold base 11 and the upper mold base 7, respectively. Then, the lidar 16 to be tested is placed into the lower mold 14. Next, the sealing cover 27 is pulled to cover the connection port 17 of the lidar 16. At this time, the first elastic element 30 is stretched. Then, the fixing seat 31 is pulled to both sides to make it insert into the connecting seat 28. The second elastic element 33 is stretched accordingly, thereby stabilizing the sealing cover 27 in the sealing position, ensuring that the connection port 17 is completely sealed, preventing gas from entering from this part and affecting the test results. Then, the hydraulic cylinder 5 is activated, and its moving rod... The upper mold base 7 is driven to move downward, causing the upper mold 15 and the lower mold 14 to close and form a complete sealed cavity. Then, a certain pressure of gas is injected into the cavity inside the mold through the air inlet 34. If the lidar 16 has a sealing defect, the gas will enter the equipment through the gap in its outer shell, causing the gas pressure inside the mold cavity to drop. Conversely, if the gas pressure inside the mold cavity remains stable, it indicates that the lidar 16 is well sealed and the airtightness is qualified. After the test is completed, the hydraulic cylinder 5 returns, the upper mold 15 is reset, the fixed base 31 is released, and the sealing cover 27 is automatically reset under the action of the first elastic element 30. The lidar 16 is then removed, completing one test cycle.

[0025] Example 2: Based on Example 1, please refer to... Figure 3 The upper mold base 7 and the lower mold base 11 are both fixedly connected to the front side of symmetrically distributed fixing rods 12. A rotating fixing block 13 is rotatably arranged on the fixing rod 12, and the rotating fixing block 13 rotates around the fixing rod 12.

[0026] After the lower mold 14 is installed into the lower mold base 11 and the upper mold 15 is installed into the upper mold base 7, the operator can manually rotate the rotating fixing block 13 from the initial vertical state to the horizontal state, so that it is located in front of the mold, thereby applying a limiting effect to the mold and preventing it from shifting or misaligning during the inspection process. This ensures a tight fit between the upper and lower molds 14 and the mold base, improving the stability and safety of the inspection process. When the inspection is completed and the mold needs to be removed, simply rotate the rotating fixing block 13 90 degrees in the opposite direction to switch it from the horizontal state to the vertical state, releasing the lock on the mold. This facilitates quick disassembly and replacement of the mold, improving the efficiency of equipment use and the convenience of maintenance.

[0027] Please see Figure 3 and Figure 4 The lower mold 14 has placement slots 20 at the four corners of its top, and each placement slot 20 has a detachable fixing member 18 inside. The upper mold 15 has embedded protrusions 21 at the four corners. One end of the fixing member 18 has an L-shaped structure that matches the contour of the corner of the lidar 16, and its surface is provided with rubber blocks 19 to increase the friction between it and the lidar 16 and prevent scratching the outer shell.

[0028] Before testing, the operator places the lidar 16 to be tested in the lower mold 14. Based on the shape and corner structure of the lidar 16, a suitable fixing part 18 is selected and embedded into the corresponding placement groove 20 on the top of the lower mold 14. At this time, the L-shaped end of the fixing part 18 is tightly fitted with the corner of the lidar 16, and the rubber block 19 is in contact with the surface of the lidar 16. Under the action of elasticity, a certain clamping force is applied to the lidar 16, thereby achieving its positioning and fixation, preventing the lidar 16 from shifting or tilting during the testing process. In addition, during the process of the hydraulic cylinder 5 driving the upper mold base 7 to move down and the upper and lower molds 14 closing, the embedded protrusion 21 on the upper mold 15 is simultaneously inserted downward into the placement groove 20 of the lower mold 14, filling the gap between the fixing part 18 and the placement groove 20, achieving complete sealing of the mold cavity, ensuring stable gas pressure during the testing process, and improving the accuracy and reliability of the testing results.

[0029] Please see Figure 4 and Figure 5 A wedge-shaped connecting rod 23 is slidably arranged in the lower part of the lower mold 14. One end of the wedge-shaped connecting rod 23 extends outward and is fixedly connected to a pressing block 22. A return spring 24 is also sleeved on the wedge-shaped connecting rod 23. The two ends of the return spring 24 are respectively connected to the lower mold 14 and the pressing block 22, providing a rearward return force for the wedge-shaped connecting rod 23. A wedge-shaped top rod 25 is slidably arranged in the center of the lower mold 14. The bottom end of the wedge-shaped top rod 25 contacts and engages with the inclined surface of the wedge-shaped connecting rod 23. A top seat 26 is fixedly connected to the top end of the wedge-shaped top rod 25.

[0030] After the airtightness test of the lidar 16 is completed, the operator presses the pressing block 22, which drives the wedge-shaped connecting rod 23 to slide backward, compressing the return spring 24. During this process, the inclined surface of the wedge-shaped connecting rod 23 pushes the wedge-shaped push rod 25 upward, thereby driving the top seat 26 to rise synchronously, lifting the lidar 16 in the lower mold 14 and making it detach from the mold for easy removal by the operator. After removing the lidar 16, the operator releases the pressing block 22. Under the elastic force of the return spring 24, the wedge-shaped connecting rod 23 returns to its original position, detaching from the pushing action on the wedge-shaped push rod 25. The wedge-shaped push rod 25 and the top seat 26 descend synchronously under the action of gravity, returning to their initial positions, completing one ejection and reset operation.

[0031] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A fixture for testing the airtightness of a laser radar unit, comprising a base (1), wherein support columns (2) are fixedly connected to the four corners of the top of the base (1), and an installation platform (3) is provided on the top of the four support columns (2). A hydraulic cylinder (5) is fixedly installed in the middle of the installation platform (3) via a first installation plate (4). A connecting plate (6) is provided at the end of the movable rod of the hydraulic cylinder (5). An upper mold base (7) is fixedly installed on the connecting plate (6). Guide seats (8) are fixedly connected to both sides of the upper mold base (7). The top of the base (1) The base (1) is fixedly connected with symmetrically distributed guide rods (9), which are slidably sleeved with the guide seat (8). A lower mold base (11) is fixedly installed at the top center of the base (1) via a second mounting plate (10). A lower mold (14) and an upper mold (15) are respectively fitted into the upper mold base (7) and the lower mold base (11). An air inlet (34) is provided on the top of the upper mold (15). A laser radar (16) is placed inside the lower mold (14). A connection port (17) is provided on the front side of the laser radar (16). The base (1) is characterized in that: The connection port (17) is covered with a sealing cover (27), and a connecting seat (28) is fixedly connected to the sealing cover (27). A first elastic element (30) is connected between the connecting seat (28) and the lower mold (14). The lower mold (14) is slidably provided with symmetrically distributed fixed seats (31). The fixed seats (31) can slide in the horizontal direction and are inserted into the side of the connecting seat (28). A second elastic element (33) is connected between the fixed seat (31) and the lower mold (14).

2. The lidar airtightness testing fixture according to claim 1, characterized in that: The upper mold base (7) and the lower mold base (11) are both fixed with symmetrically distributed fixing rods (12) on their front sides. A rotating fixing block (13) is rotatably provided on the fixing rod (12) and the rotating fixing block (13) rotates around the fixing rod (12).

3. The airtightness testing fixture for a lidar system according to claim 2, characterized in that: The lower mold (14) has placement slots (20) at the four corners of its top, and each placement slot (20) has a detachable fixing piece (18) inside. The upper mold (15) has embedded protrusions (21) at the four corners of its top.

4. The airtightness testing fixture for a lidar system according to claim 3, characterized in that: One end of the fixing member (18) has an L-shaped structure that matches the contour of the corner of the lidar (16), and its surface is provided with a rubber block (19).

5. A fixture for testing the airtightness of a lidar unit according to claim 4, characterized in that: A wedge-shaped connecting rod (23) is slidably arranged in the lower part of the lower mold (14). One end of the wedge-shaped connecting rod (23) extends outward and is fixedly connected to a pressing block (22). A return spring (24) is also sleeved on the wedge-shaped connecting rod (23). The two ends of the return spring (24) are respectively connected to the lower mold (14) and the pressing block (22). A wedge-shaped top rod (25) is slidably arranged in the center of the lower mold (14). The bottom end of the wedge-shaped top rod (25) is in contact with the inclined surface of the wedge-shaped connecting rod (23). A top seat (26) is fixedly connected to the top end of the wedge-shaped top rod (25).

6. The lidar airtightness testing fixture according to claim 5, characterized in that: The top of the connecting seat (28) is provided with a first groove (29), and the top of the fixing seat (31) is provided with a second groove (32).

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