An automobile lamp airtightness detection device

Abstract

This invention discloses an automotive headlight airtightness testing device, relating to the field of airtightness testing. This device utilizes an inflatable airbag that, when inflated, elastically bulges. This bulge, in conjunction with an air guide mechanism pressing against the outside of the headlight insertion hole, seals the hole. The inflated airbag bulges, causing a sliding ring to move upwards. This internal expansion of the airbag exerts upward pressure, creating a clamping effect with the air guide mechanism. Under this clamping pressure, a seal is formed at the insertion hole. Compared to existing airtightness testing equipment, this device achieves sealing by applying downward pressure, reducing pressure on the overall headlight structure. This prevents errors in the test results caused by small vents within the headlight structure being sealed under downward pressure.

Description

Technical Field

[0001] This invention specifically relates to an airtightness testing device for automotive headlights, and pertains to the field of airtightness testing. Background Technology

[0002] The mainstream methods for testing the airtightness of automotive headlights are differential pressure method, flow rate method and helium mass spectrometry. These methods test the sealing performance of the headlight assembly. By pressurizing or evacuating, and monitoring the pressure difference or gas leakage, the method determines whether there are gaps, holes and cracks in parts such as the housing, lamp cover, sealing ring, wiring harness hole and vent valve. This ensures that the headlights do not get water, dust, fog or short circuit in rainy weather, wading, high and low temperature and high and low altitude. A vehicle headlight airtightness testing device, disclosed in CN108458845B, includes an upper base plate, a lower base plate, and an airtightness testing system. A height adjustment device is located between the upper and lower base plates. An upper cylinder is located below the upper base plate, and a pressure block is located below the upper cylinder. A sealing box is located on the lower base plate, with a cover plate on top and a sealing block on the cover plate. The interior of the sealing box communicates with the outside through the hollow structure of the sealing block. The cover plate also has several positioning blocks for positioning the vehicle headlight. The sealing box contains a clamping mechanism for clamping mounting screws, and a tensioning cylinder for driving the clamping mechanism to tighten the mounting screws. The airtightness testing system is connected to the interior of the sealing box. This invention changes the method of clamping the vehicle headlight from top to bottom to tighten it from below, thus preventing stress on the headlight surface and avoiding the inability to detect minor leaks due to manual clamping of the headlight, thereby improving the accuracy of vehicle headlight airtightness testing. Because existing airtightness testing equipment seals the insertion hole by applying downward pressure, it puts pressure on the entire structure of the headlight. During the testing process, there are small vents in the headlight structure, but these vents seal under pressure, leading to incorrect test results. Summary of the Invention

[0003] To address the aforementioned problems, a technical solution is proposed: a device for testing the airtightness of automotive headlights, comprising: The frame has a support mechanism fixedly installed on its top, and an air pump is also fixedly installed on its top. The air guiding mechanism and the tube insertion mechanism are provided. The air guiding mechanism is installed on the top of the frame, and the tube insertion mechanism is installed on the bottom of the air guiding mechanism. A connecting pipe is fixedly installed between the air guiding mechanism and the air pump, and the air guiding mechanism and the air pump are connected through the connecting pipe. The insertion mechanism includes a through-hole tube, a fixing ring fixedly installed at the top of the outer side of the through-hole tube, a limiting ring fixedly installed on the outer side of the through-hole tube, and through holes evenly distributed on the outer side of the through-hole tube, with the through holes located between the limiting ring and the fixing ring. Arc-shaped grooves are evenly distributed at the bottom of the through-hole tube, and a sliding ring is slidably installed at the bottom of the outer side of the through-hole tube. An airbag cover is fixedly installed on the outer side of the fixing ring, and the bottom end of the airbag cover is fixedly connected to the outer side of the sliding ring. The airbag cover, through its elastic inflating after inflation, seals the insertion hole of the vehicle light. The air guiding mechanism presses against the outside of the headlight insertion hole. After inflation, the airbag cover bulges and moves the sliding ring upward. This causes the airbag cover to expand internally and apply upward pressure, forming a clamp with the pressure of the air guiding mechanism. Under this clamping pressure, a seal is formed at the insertion hole. Compared to existing airtightness testing equipment, which seals by applying downward pressure, this method reduces the pressure on the overall headlight structure. It prevents errors in the test results caused by small air vents between the headlight structure being sealed under downward pressure.

[0004] Preferably, an inner conical ring is fixedly installed on the inner wall of the through-hole tube. The bottom of the inner conical ring is a conical surface. The inner conical ring is located below the through hole. An inner sliding cylinder is fixedly installed on the bottom of the inner wall of the through-hole tube. An inner sealing plate is slidably installed on the inner wall of the inner sliding cylinder. A protruding rod is provided at the bottom of the inner sealing plate. The inner sealing plate is slidably adapted to the inner wall of the inner sliding cylinder through the protruding rod. A rubber pad is fixedly installed at the bottom end of the protruding rod. The outer diameter of the inner sealing plate gradually increases from top to bottom. Through the cooperation between the inner sealing plate and the inner conical ring, when pressurized air is introduced, the gas is preferentially introduced into the airbag cover to first seal the headlight insertion hole. This prevents the insertion hole from being unable to be sealed, which would cause the air entering the headlight to leak from the insertion hole and make it impossible to perform the headlight airtightness test. The outer side of the inner sealing plate is adapted to the conical surface at the bottom of the inner conical ring.

[0005] Preferably, the air guiding mechanism includes a slide rail plate, the bottom of which is fixedly connected to the top of the frame. A slide rail is provided on the outer side of the slide rail plate, and a slider is slidably installed on the slide rail. Two cylinders are fixedly installed on the outer side of the slide rail plate, located on both sides of the slide rail. The output end of the cylinder is fixedly connected to both sides of the slider. A connecting plate is fixedly installed on the outer side of the slider. A connecting plate is fixedly installed at the end of the connecting plate away from the slider. An air vent is fixedly installed on the top of the connecting plate, and the bottom end of the air vent passes through the connecting plate and extends to its bottom.

[0006] Preferably, a side passage pipe is provided on the outer side of the vent pipe, and one end of the vent pipe is fixedly connected to the connecting pipe through the side passage pipe. A bottom ring is fixedly installed at the bottom of the outer side of the vent pipe, and a pressure cover is fixedly installed at the bottom of the bottom ring. The pressure cover is made of rubber material. The pressure cover cooperates with the airbag cover. When sealing the insertion hole of the headlight, the cylinder drives the pressure cover to contact the insertion hole of the headlight and applies pressure during the insertion process. Together with the inflated airbag cover, a sealing structure with inner and outer clamping is formed, reducing the downward pressure on the headlight. An inner retaining ring is fixedly installed on the inner wall of the vent pipe. The inner retaining ring is located above the side passage pipe. An inner sliding column is slidably installed on the inner wall of the inner retaining ring. A pressure sensor is fixedly installed at the top of the vent pipe. The top of the inner sliding column is in contact with the detection end of the bottom of the pressure sensor. An annular groove is opened at the bottom of the outer side of the inner sliding column. A sealing ring is fixedly installed at the annular groove of the inner sliding column.

[0007] Preferably, the support mechanism includes a chassis, the bottom of which is fixedly connected to the top of the frame, and a slotted cylinder is fixedly installed on the top of the chassis. The bottom of the slotted cylinder has evenly spaced notches, and an inner sliding plate is slidably installed on the inner wall of the slotted cylinder. A bottom pad, made of elastic material, is fixedly installed between the inner sliding plate and the chassis. A fixing block is fixedly installed on the top of the inner sliding plate, and the fixing blocks are evenly installed along the center of the inner sliding plate. A convex ball ring is fixedly installed on the top of the fixing block. During the airtightness test, when there is a small air leakage gap in the headlight and the headlight is filled with a large amount of high-pressure air, the air pressure inside the headlight applies pressure to the headlight structure. Utilizing the elastic deformation of the bottom pad, the convex ball ring can slide downwards, preventing it from obstructing the outward expansion of the increased internal air pressure and preventing air from escaping through the leakage point, which would lead to incorrect measurement results. The outer side of the convex ball ring is uniformly provided with convex balls, and the top of the inner wall of the hollow groove cylinder is fixedly installed with an inner top ring. The inner wall of the inner top ring is uniformly provided with notches.

[0008] This invention provides an automotive headlight airtightness testing device, which has the following beneficial effects: (i) By inflating the airbag cover, which expands elastically after inflation, it works in conjunction with the pressure of the air guiding mechanism on the outside of the headlight insertion hole when sealing the insertion hole. The inflated airbag cover expands and moves the sliding ring upward, causing the airbag cover to expand internally and apply upward pressure. This pressure, combined with the pressure of the air guiding mechanism, forms a clamp, sealing the insertion hole. Compared to existing airtightness testing equipment that seals by applying downward pressure, this method reduces the pressure on the overall headlight structure and prevents errors in the test results caused by small air vents in the headlight structure being sealed under pressure during downward pressure.

[0009] (ii) By cooperating with the inner sealing plate and the inner cone ring, when pressurized air is introduced, the gas is preferentially introduced into the airbag cover to first seal the headlight insertion hole, so as to prevent the insertion hole from being unable to be sealed, which would cause the air entering the headlight to leak through the insertion hole and make it impossible to test the airtightness of the headlight.

[0010] (iii) By using the pressure cover and the airbag cover together, when sealing the insertion hole of the car light, the cylinder is used to drive the pressure cover to contact the insertion hole of the car light and apply pressure during the insertion process. Together with the inflated airbag cover, a sealing structure with inner and outer clamping is formed, which reduces the downward pressure on the car light.

[0011] (iv) During the air tightness test, when there is a small air leakage gap in the headlight and the headlight is filled with a large amount of high-pressure air, the air pressure inside the headlight puts pressure on the headlight structure. By utilizing the elastic deformation of the bottom pad, the convex ball ring can slide downwards, thus avoiding obstructing the expansion of the air pressure inside the headlight after it increases, preventing air from escaping from the leaking position and causing the measurement results to be incorrect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the air guiding mechanism of the present invention; Figure 4 This is a partial structural schematic diagram of the air guiding mechanism of the present invention; Figure 5 This is a partial sectional view of the air guiding mechanism of the present invention; Figure 6 This is a schematic diagram of the cannulation mechanism of the present invention; Figure 7 This is a sectional view of the insertion mechanism of the present invention; Figure 8 This is a partial sectional view of the cannulation mechanism of the present invention; Figure 9 This is a schematic diagram of the support mechanism of the present invention; Figure 10 This is a cross-sectional view of the support mechanism of the present invention.

[0013] In the diagram: 1. Frame; 2. Support mechanism; 3. Air guiding mechanism; 4. Tubing mechanism; 5. Connecting pipe; 6. Air pump; 21. Chassis; 22. Empty slotted cylinder; 23. Inner top ring; 24. Convex ball ring; 25. Fixing block; 26. Inner sliding plate; 27. Bottom pad; 301. Slide rail plate; 302. Cylinder; 303. Slider; 304. Connecting plate; 305. Air pipe; 306. Pressure sensor; 307. Connecting plate; 308. Bottom ring; 309. Pressure cover; 310. Inner sliding column; 311. Inner retaining ring; 312. Sealing ring; 41. Through-hole pipe; 42. Airbag cover; 43. Fixing ring; 44. Limiting ring; 45. Sliding ring; 46. Inner cone ring; 47. Inner sliding cylinder; 48. Rubber pad; 49. Inner sealing plate. Detailed Implementation

[0014] Example 1, Reference Figures 1 to 2 and Figures 6 to 8 The present invention provides the following technical solution: An automotive headlight airtightness testing device, comprising: The frame 1 has a support mechanism 2 fixedly installed on its top, and an air pump 6 fixedly installed on its top. The air guiding mechanism 3 and the insertion mechanism 4 are installed at the top of the frame 1 and at the bottom of the air guiding mechanism 3. A connecting pipe 5 is fixedly installed between the air guiding mechanism 3 and the air pump 6, and the air guiding mechanism 3 and the air pump 6 are connected through the connecting pipe 5. The insertion mechanism 4 includes a through-hole tube 41. A fixing ring 43 is fixedly installed on the top of the outer side of the through-hole tube 41, and a limiting ring 44 is fixedly installed on the outer side of the through-hole tube 41. Through holes are evenly distributed on the outer side of the through-hole tube 41, and the through holes are located between the limiting ring 44 and the fixing ring 43. Arc grooves are evenly distributed on the bottom of the through-hole tube 41. Due to the elastic material characteristics of the rubber pad 48, when gas is first introduced, the rubber pad 48 pushes up the inner sealing plate 49, sealing the gas flow path between the inner sealing plate 49 and the inner conical ring 46, allowing the initially introduced air to pass through the through-hole tube 41. The airbag cover 42 is inflated through the through hole 1, causing it to bulge. During the inflation process, the sliding ring 45 slides upward, and the airbag cover 42 bulges at the insertion hole inside the headlight. Combined with the pressure of the pressure cover 309 on the headlight, the airbag cover 42 bulges and fills the insertion hole, forming an inner and outer clamping seal at the insertion hole. The sliding ring 45 is slidably installed on the bottom of the outer side of the through hole tube 41, and the airbag cover 42 is fixedly installed on the outer side of the fixing ring 43. The bottom end of the airbag cover 42 is fixedly connected to the outer side of the sliding ring 45.

[0015] An inner conical ring 46 is fixedly installed on the inner wall of the through-hole pipe 41. The bottom of the inner conical ring 46 is a conical surface. The inner conical ring 46 is located below the through hole. An inner sliding cylinder 47 is fixedly installed on the bottom of the inner wall of the through-hole pipe 41. An inner sealing plate 49 is slidably installed on the inner wall of the inner sliding cylinder 47. A protruding rod is provided at the bottom of the inner sealing plate 49. The inner sealing plate 49 slides and adapts to the inner wall of the inner sliding cylinder 47 through the protruding rod. As the amount of air introduced increases, the air pressure inside the through-hole pipe 41 gradually increases, pushing the inner sealing plate 49 to compress the rubber pad 48 and deform it, opening the flow path between the inner sealing plate 49 and the inner conical ring 46, so that air is introduced into the vehicle light through the arc groove at the bottom of the through-hole pipe 41. The bottom end of the protruding rod is fixedly installed with a rubber pad 48. The outer diameter of the inner sealing plate 49 gradually increases from top to bottom, and the outer side of the inner sealing plate 49 is adapted to the conical surface at the bottom of the inner conical ring 46.

[0016] Example 2, based on Example 1, with reference to Figures 3 to 5 The air guiding mechanism 3 includes a slide rail plate 301, the bottom of which is fixedly connected to the top of the frame 1. A slide rail is provided on the outer side of the slide rail plate 301, and a slider 303 is slidably mounted on the slide rail. Two cylinders 302 are fixedly mounted on the outer side of the slide rail plate 301, located on both sides of the slide rail. The output ends of the cylinders 302 are fixedly connected to both sides of the slider 303. When the vehicle light is inserted, the cylinders 302 are activated, causing them to slide and move the slider 303 down along the slide rail of the slide rail plate 301. During this downward movement, the connecting plate 304 and connecting disc 307 move down, and the air pipe 305 and the insertion mechanism 4 move down synchronously, allowing the insertion mechanism 4 to insert into the insertion hole of the vehicle light. During the insertion process, the bottom ring 308 at the bottom of the vent pipe 305 cooperates with the pressure cover 309, so that the bottom of the pressure cover 309 contacts the outside of the headlight insertion hole and applies downward pressure to the headlight. Then, the air pump 6 is started, and the vent pipe 305 is connected by the connecting pipe 5, so that the pressurized air enters the vent pipe 305 and is introduced into the insertion mechanism 4. The insertion mechanism 4 first uses the introduced air, together with the pressure cover 309, to press the headlight and seal the insertion hole. A connecting plate 304 is fixedly installed on the outside of the slider 303. A connecting plate 307 is fixedly installed on the end of the connecting plate 304 away from the slider 303. A vent pipe 305 is fixedly installed on the top of the connecting plate 307. The bottom end of the vent pipe 305 passes through the connecting plate 307 and extends to its bottom.

[0017] A side passage pipe is provided on the outer side of the vent pipe 305. The vent pipe 305 is fixedly connected to one end of the connecting pipe 5 through the side passage pipe. A bottom ring 308 is fixedly installed at the bottom of the outer side of the vent pipe 305. A pressure cover 309, made of rubber, is fixedly installed at the bottom of the bottom ring 308. An inner retaining ring 311 is fixedly installed on the inner wall of the vent pipe 305. The inner retaining ring 311 is located above the side passage pipe. An inner sliding column 310 is slidably installed on the inner wall of the inner retaining ring 311. A pressure sensor 306 is fixedly installed at the top of the vent pipe 305. The top of the column 310 is attached to the detection end at the bottom of the pressure sensor 306, which introduces pressurized air into the headlight. After pressurization, the air pressure inside the headlight is made consistent with the air pressure between the vent pipes 305. The air pressure between the vent pipes 305 is transmitted to the detection position at the bottom of the pressure sensor 306 through the inner sliding column 310 for air pressure detection. The air tightness of the headlight is detected by the air pressure change after the air intake stops. An annular groove is provided at the bottom of the outer side of the inner sliding column 310, and a sealing ring 312 is fixedly installed at the annular groove of the inner sliding column 310.

[0018] Example 3, based on Examples 1 and 2, with reference to Figures 9 to 10 The support mechanism 2 includes a chassis 21, the bottom of which is fixedly connected to the top of the frame 1. A slotted cylinder 22 is fixedly installed on the top of the chassis 21. The bottom of the slotted cylinder 22 has evenly spaced notches, and an inner sliding plate 26 is slidably installed on the inner wall of the slotted cylinder 22. A bottom pad 27 is fixedly installed between the inner sliding plate 26 and the chassis 21. The bottom pad 27 is made of elastic material. The vehicle lamp to be tested is placed inside the slotted cylinder 22, with the insertion port for the airtightness test of the vehicle lamp positioned at the top. After placement, the inner top ring 23 and the convex ball ring 24 on the inner wall of the slotted cylinder 22 cooperate to support the bottom of the vehicle lamp. The air guiding mechanism 3 drives the insertion tube mechanism 4 to insert into the vehicle lamp. When the lamp is inserted into the hole, the air guiding mechanism 3 applies pressure to the top of the roof. At this time, the pressure is transmitted to the inner sliding plate 26 through the convex ball ring 24 and the fixing block 25. The sliding connection between the inner sliding plate 26 and the inner wall of the hollow groove cylinder 22 causes the inner sliding plate 26 to slide and compress the bottom pad 27, forming a buffer displacement space at the bottom of the lamp. The fixing block 25 is fixedly installed on the top of the inner sliding plate 26. The fixing block 25 is evenly installed along the center position of the inner sliding plate 26. The convex ball ring 24 is fixedly installed on the top of the fixing block 25. The outer side of the convex ball ring 24 is evenly provided with convex balls. The top of the inner wall of the hollow groove cylinder 22 is fixedly installed with an inner top ring 23. The inner wall of the inner top ring 23 is evenly provided with notches.

[0019] In use, place the car headlight to be tested for air tightness on top of the support mechanism 2, with the headlight air tightness test insertion hole at the top. Then, start the air guiding mechanism 3, which will drive the insertion mechanism 4 to move down. During the downward movement, the insertion mechanism 4 will be inserted into the headlight to be tested and positioned at the headlight's test insertion hole. Then, start the air pump 6, which will pressurize the air and introduce it into the air guiding mechanism 3 through the connecting pipe 5. The air guiding mechanism 3 will then guide the gas into the headlight for air tightness testing.

[0020] In the support mechanism 2, the vehicle lamp to be tested is placed inside the empty slot cylinder 22, and the insertion port for the air tightness test of the vehicle lamp is positioned at the top during insertion. After insertion, the inner top ring 23 and the convex ball ring 24 on the inner wall of the empty slot cylinder 22 cooperate to support the bottom of the vehicle lamp. When the air guiding mechanism 3 drives the insertion tube mechanism 4 to insert into the insertion hole of the vehicle lamp, the air guiding mechanism 3 forms pressure on the top of the vehicle roof. At this time, the pressure is transmitted to the inner sliding plate 26 through the convex ball ring 24 and the fixing block 25. By utilizing the sliding connection between the inner sliding plate 26 and the inner wall of the empty slot cylinder 22, the inner sliding plate 26 slides and compresses the bottom pad 27, forming a buffer displacement space at the bottom of the vehicle lamp.

[0021] In the air guiding mechanism 3, after the vehicle light is inserted, the cylinder 302 is activated, causing the slider 303 to slide downwards along the slide rail of the slide rail plate 301. During this downward movement, the connecting plate 304 and the connecting disc 307 also move downwards, causing the air pipe 305 and the insertion mechanism 4 to move downwards simultaneously. This allows the insertion mechanism 4 to be inserted into the insertion hole of the vehicle light. Simultaneously, during insertion, the bottom ring 308 of the air pipe 305 engages with the pressure cover 309, causing the bottom of the pressure cover 309 to contact the outside of the vehicle light insertion hole and apply downward pressure to the vehicle light. Then, the air pump 6 is activated to... Connect the vent pipe 305 with the connecting pipe 5 to allow pressurized air to enter the vent pipe 305 and be introduced into the insertion mechanism 4. The insertion mechanism 4 first uses the introduced air, in conjunction with the pressure cover 309, to pressurize the headlight and seal the insertion hole. Then, pressurized air is introduced into the headlight and pressurized again to make the air pressure inside the headlight consistent with the air pressure between the vent pipe 305 and the headlight. The air pressure between the vent pipe 305 is transmitted to the detection position at the bottom of the pressure sensor 306 through the inner sliding column 310 for air pressure detection. The air tightness of the headlight is detected by the air pressure change after the air intake stops.

[0022] In the insertion mechanism 4, due to the elastic material characteristics of the rubber pad 48, when gas is first introduced, the rubber pad 48 lifts the inner sealing plate 49, sealing the gas flow path between the inner sealing plate 49 and the inner cone ring 46. The initially introduced air is then introduced into the interior of the airbag cover 42 through the through hole of the through hole tube 41, causing the airbag cover 42 to inflate and bulge. During the bulging process, the sliding ring 45 slides upward, and during the upward bulging process, the airbag cover 42 bulges at the insertion hole inside the headlight. With the pressure of the pressure cover 309 on the headlight, the airbag cover 42 bulges and fills the insertion hole position, forming an inner and outer clamping seal at the insertion hole position. Subsequently, as the amount of introduced air increases, the air pressure inside the through hole tube 41 gradually increases, pushing the inner sealing plate 49 to compress the rubber pad 48 and deform, opening the flow path between the inner sealing plate 49 and the inner cone ring 46, allowing air to be introduced into the headlight through the arc groove at the bottom of the through hole tube 41.

Claims

1. A device for testing the airtightness of automotive headlights, characterized in that, include: The frame (1) has a support mechanism (2) fixedly installed on its top and an air pump (6) fixedly installed on its top. The air guiding mechanism (3) and the insertion mechanism (4) are installed at the top of the frame (1) and at the bottom of the air guiding mechanism (3). A connecting pipe (5) is fixedly installed between the air guiding mechanism (3) and the air pump (6). The air guiding mechanism (3) and the air pump (6) are connected through the connecting pipe (5). The insertion mechanism (4) includes a through-hole tube (41), a fixing ring (43) is fixedly installed on the top of the outside of the through-hole tube (41), a limiting ring (44) is fixedly installed on the outside of the through-hole tube (41), and through holes are evenly opened on the outside of the through-hole tube (41), and the through holes are located between the limiting ring (44) and the fixing ring (43). Arc grooves are evenly opened on the bottom of the through-hole tube (41), and a sliding ring (45) is slidably installed on the bottom of the outside of the through-hole tube (41). An airbag cover (42) is fixedly installed on the outside of the fixing ring (43), and the bottom end of the airbag cover (42) is fixedly connected to the outside of the sliding ring (45).

2. The automotive headlight airtightness testing device according to claim 1, characterized in that: An inner conical ring (46) is fixedly installed on the inner wall of the through-hole pipe (41). The bottom of the inner conical ring (46) is a conical surface. The inner conical ring (46) is located below the through hole. An inner sliding cylinder (47) is fixedly installed on the bottom of the inner wall of the through-hole pipe (41). An inner sealing plate (49) is slidably installed on the inner wall of the inner sliding cylinder (47). A protruding rod is provided at the bottom of the inner sealing plate (49).

3. The automotive headlight airtightness testing device according to claim 2, characterized in that: The inner sealing plate (49) is slidably adapted to the inner wall of the inner sliding cylinder (47) by means of a protruding rod, and a rubber pad (48) is fixedly installed at the bottom end of the protruding rod. The outer diameter of the inner sealing plate (49) gradually increases from top to bottom, and the outer side of the inner sealing plate (49) is adapted to the conical surface at the bottom of the inner conical ring (46).

4. The automotive headlight airtightness testing device according to claim 3, characterized in that: The air guiding mechanism (3) includes a slide rail plate (301), the bottom of which is fixedly connected to the top of the frame (1). A slide rail is provided on the outer side of the slide rail plate (301), and a slider (303) is slidably installed on the slide rail of the slide rail plate (301). A cylinder (302) is fixedly installed on the outer side of the slide rail plate (301). There are two cylinders (302) located on both sides of the slide rail. The output end of the cylinder (302) is fixedly connected to both sides of the slider (303).

5. The automotive headlight airtightness testing device according to claim 4, characterized in that: A connecting plate (304) is fixedly installed on the outside of the slider (303). A connecting plate (307) is fixedly installed on the end of the connecting plate (304) away from the slider (303). A vent pipe (305) is fixedly installed on the top of the connecting plate (307). The bottom end of the vent pipe (305) passes through the connecting plate (307) and extends to its bottom.

6. The automotive headlight airtightness testing device according to claim 5, characterized in that: A side passage pipe is provided on the outside of the vent pipe (305). The vent pipe (305) is fixedly connected to one end of the connecting pipe (5) through the side passage pipe. A bottom ring (308) is fixedly installed at the bottom of the outside of the vent pipe (305). A pressure cover (309) is fixedly installed at the bottom of the bottom ring (308). The pressure cover (309) is made of rubber.

7. The automotive headlight airtightness testing device according to claim 6, characterized in that: An inner retaining ring (311) is fixedly installed on the inner wall of the vent pipe (305). The inner retaining ring (311) is located above the side pipe. An inner sliding column (310) is slidably installed on the inner wall of the inner retaining ring (311). A pressure sensor (306) is fixedly installed at the top of the vent pipe (305). The top of the inner sliding column (310) is in contact with the detection end at the bottom of the pressure sensor (306). An annular groove is opened at the bottom of the outer side of the inner sliding column (310). A sealing ring (312) is fixedly installed at the annular groove of the inner sliding column (310).

8. The automotive headlight airtightness testing device according to claim 7, characterized in that: The support mechanism (2) includes a chassis (21), the bottom of which is fixedly connected to the top of the frame (1), and a slotted cylinder (22) is fixedly installed on the top of the chassis (21). The bottom of the slotted cylinder (22) is evenly provided with notches, and an inner sliding plate (26) is slidably installed on the inner wall of the slotted cylinder (22).

9. The automotive headlight airtightness testing device according to claim 8, characterized in that: A base plate (27) is fixedly installed between the inner slide (26) and the chassis (21). The base plate (27) is made of elastic material. A fixing block (25) is fixedly installed on the top of the inner slide (26). The fixing block (25) is evenly installed along the center position of the inner slide (26).

10. The automotive headlight airtightness testing device according to claim 9, characterized in that: A convex ball ring (24) is fixedly installed on the top of the fixed block (25). Convex balls are evenly arranged on the outer side of the convex ball ring (24). An inner top ring (23) is fixedly installed on the top of the inner wall of the hollow groove cylinder (22). The inner wall of the inner top ring (23) is evenly provided with notches.

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