A kind of laser ranging module air tightness detection device based on end face direct sealing

Abstract

The utility model discloses a kind of laser ranging module air-tightness detection device based on end face direct sealing, it is related to air-tightness detection technical field, to solve the problem of low efficiency, high cost, difficult integration of existing detection method.The device includes rack, lower bearing component, upper pressing component, drive unit and gas circuit system;Lower bearing component is fixed in rack, containing lower sealing cavity and first sealing pad, lower sealing cavity is connected to water by hose;Upper pressing component is located directly above lower bearing component, is driven lifting by drive unit, containing upper sealing plate and second sealing pad, is connected external air source and control module by hose.The utility model uses end face direct sealing to replace chamber type sealing, without precision sensor, realize one-key type semi-automatic detection, with compact structure, low in cost, detect fast, easily integrated to the advantage of production line, can efficiently complete laser ranging module air-tightness detection.

Description

Technical Field

[0001] This utility model relates to the field of airtightness testing technology, and in particular to an airtightness testing device for a laser ranging module based on direct end-face sealing. Background Technology

[0002] When laser ranging modules operate long-term in complex environments (such as humid or dusty environments), their core airtightness is a key factor in ensuring reliability, requiring precise airtightness testing. Existing methods and equipment for testing the airtightness of laser ranging modules have several shortcomings: Regarding testing methods, traditional water testing requires immersing a gas-filled workpiece in water and manually observing bubbles to determine airtightness. This method has low automation, low testing efficiency, and is prone to misjudgment due to manual observation. Furthermore, the workpiece needs additional drying after immersion, adding to the process and posing a risk of rust and damage. While differential pressure testing offers higher accuracy, it relies on high-precision pressure sensors to construct the reference and test chambers, resulting in high equipment costs. It also places extremely stringent requirements on the machining precision of the test chamber and the performance of the sealing rings, making the testing process complex and difficult to obtain results quickly.

[0003] In terms of equipment structure, existing testing fixtures mostly adopt a "chamber-type" sealed structure, which requires the entire laser ranging module to be placed in a large sealed container for testing. This structure is large in size, has a long operation cycle, and consumes a lot of gas during the testing process. Moreover, the "chamber-type" sealed fixture is difficult to integrate with automated production lines and cannot meet the needs of rapid online testing in production scenarios. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a laser ranging module air tightness testing device based on direct end-face sealing, so as to realize low-cost, fast, semi-automatic air tightness testing of laser ranging modules and facilitate integration into the production line.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A laser ranging module airtightness testing device based on direct end-face sealing includes a frame, a lower support assembly, an upper pressure assembly, a drive unit, and an air circuit system; The lower support assembly is fixed on the frame and is used to support and position the laser module to be tested. The lower support assembly includes an air outlet assembly, a first sealing gasket and a lower sealing cavity. The first sealing gasket is disposed on the upper end face of the air outlet assembly, and the lower sealing cavity is connected to the water through a back hose. The upper pressure assembly is located directly above the lower support assembly, and the drive unit is connected to the upper pressure assembly for driving the upper pressure assembly to perform vertical lifting and lowering movements. The upper pressure assembly includes an air intake assembly, a second sealing gasket, and an upper sealing plate, wherein the second sealing gasket is disposed on the lower end face of the upper sealing plate; The gas system includes a hose, a gas source, and a control module. The air intake assembly is connected to the gas source and the control module via the hose. The control module is used to control the gas supply and demand of the gas source.

[0006] Furthermore, the lower support assembly also includes a positioning fixture, which is disposed on the upper end face of the air outlet assembly and is used to position the laser module to be tested.

[0007] Furthermore, the driving unit is a cylinder, the piston rod of the cylinder is fixedly connected to the upper pressing assembly, the cylinder is electrically connected to the control module, and the control module is used to control the extension and retraction of the cylinder.

[0008] Furthermore, both the first and second sealing gaskets are elastic sealing gaskets, and the elastic sealing gaskets are made of nitrile rubber or silicone rubber.

[0009] Furthermore, the gas path system also includes a pressure gauge, which is mounted on the hose and used to monitor the gas pressure inside the hose.

[0010] Furthermore, it also includes a start switch, which is electrically connected to the control module and is used to send start or stop commands to the control module.

[0011] Furthermore, a sealing joint is provided at the connection between the lower sealing cavity and the back hose, the sealing joint being used to prevent gas leakage.

[0012] Furthermore, the frame is provided with a guide rod, and the pressing assembly is provided with a guide hole adapted to the guide rod. The guide rod passes through the guide hole and is used to guide the lifting and lowering movement of the pressing assembly.

[0013] Beneficial effects: (1) Structural direct sealing technology: This utility model abandons the traditional "chamber" sealing and innovatively adopts an upper and lower opposing sealing joint, which is directly pressed onto the laser module body, thereby constructing a test gas path inside the module. This structure greatly reduces the volume of the sealing space, so that even under small leakage, considerable bubbles can be generated quickly, improving the detection sensitivity, while achieving fast response and extremely low gas consumption.

[0014] (2) Synergistic integration of semi-automatic functions: This utility model integrates the linear drive of the cylinder, the end face sealing of the airtight tool, and the automatic on / off of the gas through a simple switch command. This integrated design combines the originally cumbersome multiple manual steps (alignment, sealing, and inflation) into one automated action, which, while ensuring the reliability of the detection, achieves extreme simplification of operation and significant improvement in efficiency.

[0015] (3) Low-cost design based on principle bypass: This utility model deliberately avoids the use of high-cost differential pressure sensors and complex circuit systems, and instead returns to and innovates the basic bubble detection method. Through innovative mechanical structure, it adapts to the semi-automated production rhythm, providing a technical path that achieves an excellent balance between cost, efficiency and reliability, forming a distinct difference from existing patent solutions. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is an overall isometric view of the airtightness testing device for a laser ranging module based on direct end-face sealing as described in this embodiment of the present invention. Figure 2 This is an overall cross-sectional view of the airtightness testing device for a laser ranging module based on direct end-face sealing, as described in an embodiment of this utility model. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Example 1 See Figure 1-2 A laser ranging module air tightness testing device based on direct end-face sealing includes a frame 1, a lower support assembly 2, an upper pressure assembly 3, a drive unit 4, and an air circuit system 5. The lower support assembly 2 is fixed on the frame 1 and is used to support and position the laser module 100 to be tested. The lower support assembly 2 includes an air outlet assembly 21, a first sealing gasket 22 and a lower sealing cavity 23. The first sealing gasket 22 is disposed on the upper end face of the air outlet assembly 21, and the lower sealing cavity 23 is connected to the water 6 through a back hose 51. The upper pressure component 3 is located directly above the lower support component 2, and the drive unit 4 is connected to the upper pressure component 3 for driving the upper pressure component 3 to perform vertical lifting and lowering movements. The upper pressure assembly 3 includes an air intake assembly 31, a second sealing gasket 32, and an upper sealing plate 33, wherein the second sealing gasket 32 ​​is disposed on the lower end face of the upper sealing plate 33; The gas system 5 includes a hose 52, a gas source 53, and a control module 54. The air intake assembly 31 is connected to the gas source 53 and the control module 54 through the hose 52. The control module 54 is used to control the gas supply and demand of the gas source 53.

[0020] This embodiment uses an upper and lower opposing sealing component (i.e., the first sealing gasket on the lower support component and the second sealing gasket on the upper pressure component) to directly press the laser module end face to achieve sealing, abandoning the traditional "chamber-type" sealing, greatly reducing the volume of the sealing space, and even a small leak can quickly generate considerable bubbles, improving detection sensitivity; at the same time, the sealing action has a fast response, a short single detection cycle, and low gas consumption, significantly improving detection efficiency. It is understandable that this embodiment realizes the linkage control of the drive unit and the gas source through the control module, integrates the "placement-sealing-inflation-detection" process, and can complete the detection with one-click operation, reducing the technical threshold and labor intensity of operators.

[0021] Furthermore, the detection device in this embodiment is simple to operate, and the single detection time can be controlled within 30 seconds. The detection cost is only 1 / 5 of that of traditional differential pressure method equipment. It can also be directly integrated into the end of the production line of the laser ranging module to achieve online detection, significantly improving production efficiency and detection reliability.

[0022] In a specific example, the lower support component 2 further includes a positioning fixture, which is disposed on the upper end face of the air outlet component 21 and is used to position the laser module 100 to be tested.

[0023] The positioning fixture in this embodiment is used to position the laser module to be tested, ensuring that the laser module is placed accurately and guaranteeing the subsequent sealing effect.

[0024] In a specific example, the drive unit 4 is a cylinder, the piston rod of the cylinder is fixedly connected to the upper pressure assembly 3, the cylinder is electrically connected to the control module 54, and the control module 54 is used to control the extension and retraction of the cylinder.

[0025] The cylinder-driven method in this embodiment has the advantages of fast response and stable power, which can quickly realize the lifting and lowering of the upper pressure component and improve detection efficiency.

[0026] In a specific example, both the first sealing gasket 22 and the second sealing gasket 32 ​​are elastic sealing gaskets, and the elastic sealing gaskets are made of nitrile rubber or silicone rubber.

[0027] The elastic sealing gasket in this embodiment can fit tightly against the end face of the laser module when under pressure, ensuring sealing reliability. Furthermore, the nitrile rubber and silicone rubber have good aging resistance and sealing properties, extending the service life of the sealing gasket.

[0028] In one specific example, the gas system 5 further includes a pressure gauge, which is mounted on the hose 52 and is used to monitor the gas pressure inside the hose 52.

[0029] It should be noted that operators can monitor the inflation pressure in real time using a pressure gauge to avoid damaging the laser module due to excessive pressure or affecting the detection sensitivity due to insufficient pressure.

[0030] In a specific example, a start switch is also included, which is electrically connected to the control module 54 and is used to send start or stop commands to the control module 54.

[0031] This embodiment enables one-button operation via a start switch, simplifying the testing process and lowering the technical threshold for operators.

[0032] In one specific example, a sealing joint is provided at the connection between the lower sealing cavity 23 and the back hose 51, the sealing joint being used to prevent gas leakage.

[0033] This embodiment uses a sealed joint to avoid misjudgment of test results due to air leakage at the connection, thus ensuring the accuracy of the test.

[0034] In a specific example, the frame 1 is provided with a guide rod, and the upper pressing assembly 3 is provided with a guide hole adapted to the guide rod. The guide rod passes through the guide hole and is used to guide the lifting and lowering movement of the upper pressing assembly 3.

[0035] The guide rod in this embodiment can guide the lifting and lowering movement of the upper pressure component, prevent the upper pressure component from shifting during the lifting and lowering process, ensure that the upper and lower sealing gaskets are accurately aligned with the end face of the laser module, and improve the sealing effect.

[0036] The working principle of this embodiment: The working process of this utility model's laser ranging module airtightness testing device based on direct end-face sealing is as follows: Module placement: The operator places the laser module to be tested on the positioning fixture of the lower support component. The positioning fixture accurately positions the laser module to be tested. Downward sealing: The operator presses the start switch, which sends a start command to the control module. The control module controls the drive unit (cylinder) to move, and the cylinder piston rod extends, driving the upper pressure assembly to move downward along the guide rod until the second sealing gasket of the upper pressure assembly is in contact with the upper end face of the laser module and the first sealing gasket of the lower support assembly is in contact with the lower end face of the laser module. As the pressure continues to decrease, the elastic sealing gasket is deformed under pressure, achieving a seal between the upper and lower end faces of the laser module and forming a closed test gas path inside the laser module. Inflation Test: After sealing, the control module automatically turns on the gas source, and compressed gas enters the air intake component of the upper pressure assembly through the hose, thus filling the laser module. The operator monitors the inflation pressure by observing the pressure gauge to ensure that the pressure is within a reasonable range. At the same time, the operator observes whether air bubbles are generated in the water through the back hose connected to the lower sealing cavity: If the laser module is airtight, the gas inside the module is blocked by the lens and cannot enter the lower sealing cavity, and no continuous air bubbles are generated in the water; if there is a leak in the laser module, the gas enters the lower sealing cavity through the leak and is then discharged into the water through the back hose, and continuous air bubbles appear in the water. Judgment result: The airtightness of the laser module is judged based on whether continuous bubbles are generated in the water; if there are no continuous bubbles in the water, it is judged as qualified; if there are continuous bubbles in the water, it is judged as unqualified. Reset and Retrieval: After the inspection is completed, the operator presses the start switch again. The control module shuts off the air supply and retracts the cylinder piston rod, causing the upper pressure component to move upward and reset. The operator then removes the inspected laser module from the positioning fixture, completing one inspection cycle.

[0037] 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 device for detecting the airtightness of a laser ranging module based on direct end-face sealing, characterized in that, It includes a frame (1), a lower support assembly (2), an upper pressure assembly (3), a drive unit (4), and an air circuit system (5); The lower support assembly (2) is fixed on the frame (1) and is used to support and position the laser module (100) to be tested. The lower support assembly (2) includes an air outlet assembly (21), a first sealing gasket (22) and a lower sealing cavity (23). The first sealing gasket (22) is disposed on the upper end face of the air outlet assembly (21), and the lower sealing cavity (23) is connected to the water (6) through a back hose (51). The upper pressure assembly (3) is located directly above the lower support assembly (2), and the drive unit (4) is connected to the upper pressure assembly (3) for driving the upper pressure assembly (3) to perform vertical lifting and lowering movements. The upper pressure assembly (3) includes an air intake assembly (31), a second sealing gasket (32) and an upper sealing plate (33), wherein the second sealing gasket (32) is disposed on the lower end face of the upper sealing plate (33); The gas system (5) includes a hose (52), a gas source (53) and a control module (54). The air intake assembly (31) is connected to the gas source (53) and the control module (54) respectively through the hose (52). The control module (54) is used to control the gas supply and demand of the gas source (53).

2. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, The lower support assembly (2) also includes a positioning fixture, which is disposed on the upper end face of the air outlet assembly (21) and is used to position the laser module (100) to be tested.

3. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, The drive unit (4) is a cylinder. The piston rod of the cylinder is fixedly connected to the upper pressure assembly (3). The cylinder is electrically connected to the control module (54). The control module (54) is used to control the extension and retraction of the cylinder.

4. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, Both the first sealing gasket (22) and the second sealing gasket (32) are elastic sealing gaskets, and the material of the elastic sealing gasket is nitrile rubber or silicone rubber.

5. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, The gas system (5) also includes a pressure gauge, which is installed on the hose (52) to monitor the gas pressure inside the hose (52).

6. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, It also includes a start switch, which is electrically connected to the control module (54) and is used to send start or stop commands to the control module (54).

7. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, A sealing joint is provided at the connection between the lower sealing cavity (23) and the back hose (51), and the sealing joint is used to prevent gas leakage.

8. The airtightness testing device for a laser ranging module based on direct end-face sealing according to claim 1, characterized in that, The frame (1) is provided with a guide rod, and the upper pressing assembly (3) is provided with a guide hole adapted to the guide rod. The guide rod passes through the guide hole and is used to guide the lifting and lowering movement of the upper pressing assembly (3).

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