An automatic detection device for the airtightness of die-cast parts for new energy vehicles

Abstract

This invention relates to the field of automotive die-casting airtightness testing technology, specifically an automatic testing device for the airtightness of die-castings in new energy vehicles. The device includes: a testing mechanism mounted on a testing platform, and a conveying mechanism and a coating mechanism mounted on the front and rear of the testing mechanism. Through the cooperation of the testing mechanism, the conveying mechanism, and the coating mechanism, this invention can automatically unload fan motor housings that pass the pressure drop method test, or directly detect and locate leak points in unqualified housings, thereby eliminating the redundant steps of repeated disassembly, transfer, and secondary clamping of the housings in traditional step-by-step operations. Furthermore, through the cooperation of the testing mechanism, the conveying mechanism, and the coating mechanism, this invention can also integrate water immersion and oil coating testing devices in the same equipment, thereby automatically matching the appropriate testing mode based on the leakage data of unqualified fan motor housings.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing technology for automotive die-cast parts, specifically to an automatic airtightness testing device for new energy vehicle die-cast parts. Background Technology

[0002] New energy vehicle die-cast parts are aluminum alloy or other lightweight metal parts formed by high pressure casting process. Among them, the die-cast housing of the automotive fan motor is the external protective structure of the automotive cooling fan motor, which is used to wrap the internal components of the motor and play a role in fixing, heat dissipation and sealing protection. After the fan motor housing die-cast part is formed, its side wall usually needs to be tested for air tightness to ensure that the fan motor meets the required air tightness requirements.

[0003] In existing mass production processes, the airtightness of the fan motor housing is usually tested using a low-cost pressure drop method: First, the housing is positioned on a testing platform, and a sealing gasket is installed on the platform to seal the lower opening of the housing. Then, a cylinder drives a sealing disc to move downwards until the sealing disc, together with the sealing gasket, stably seals the upper end face of the housing, the pressure relief hole on the upper end face, and the lower opening of the housing. At the same time, the air injection pipe installed on the lower side of the sealing disc moves synchronously until it is fully inserted into the housing through the opening on the upper end face, and a preset amount of compressed air is injected into the housing. The sealing disc and the high-precision detection system in the detector monitor the pressure changes inside the housing in real time and calculate the overall leakage. Finally, based on the set threshold, it is determined whether the airtightness of the fan motor housing meets the standard.

[0004] However, the traditional method of testing the airtightness of fan motor housings using the pressure drop method has the following problems: 1. In the existing technology, the pressure drop method can only provide a conclusive result on whether the total leakage of the fan motor housing exceeds the limit, but it cannot directly locate the specific leakage location on the defective housing. Therefore, when a defective fan motor housing is detected, the operator needs to remove the defective housing and then use other equipment to conduct a secondary inspection. The above-mentioned step-by-step operation not only increases the overall inspection time, manual operation burden and labor costs, and reduces the overall inspection efficiency, but may also lead to mutual confusion of leakage point information and production batch data of various housings, thereby affecting the efficiency and accuracy of targeted optimization of the die-casting process. 1. Accuracy; 2. In the existing pressure drop method testing process, the low-cost testing methods for locating and detecting leaks in non-conforming shells are usually the water immersion method or the oiling method. Because the water immersion method relies on the characteristic of gas overcoming the surface tension of water, it is difficult to detect minute leaks caused by small gaps. Although the oiling method can locate small cracks, it requires manual application of oil to the inside of the shell in sequence. After the location test is completed, all non-conforming shells need to be cleaned of oil stains again. If both methods are introduced at the same time to take into account different leakage amounts, it will not only increase the number of testing stations and equipment and increase space costs, but also require manual switching of equipment and clamping of shells, resulting in low automation and increased manual intervention, thus reducing the overall testing efficiency. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automatic detection device for the air tightness of die-cast parts for new energy vehicles, used for automatically detecting the air tightness of automotive fan motor housings, including a detection platform, a detection mechanism on the detection platform, and a conveying mechanism and a coating mechanism arranged in front and behind the detection mechanism.

[0006] The testing mechanism includes a top plate fixedly mounted on the upper side of the testing platform by a support rod, a sealing support part for supporting the shell is provided on the lower side of the top plate, a testing part for testing the airtightness of the shell in conjunction with the sealing support part is provided on the top plate, and a water immersion part for immersing the shell in water is provided on the testing platform and below the sealing support part.

[0007] The conveying mechanism includes mounting platforms that are symmetrically fixed on the lower side of the top plate. A linear conveying section for front and rear conveying housings is provided on the mounting platform. A driven lifting section for positioning the housing with the detection section is provided on the linear conveying section. A clamping adjustment section for rotating the housing and a clamping drive section for driving the clamping adjustment section to position the clamping housing are provided on the driven lifting section.

[0008] The coating mechanism includes a fixed frame that is fixedly installed on the lower side of the top plate and behind the sealing support. The fixed frame is equipped with a rotary coating part that automatically applies oil to the inside of the housing and a lifting supply part that replenishes the oil to the rotary coating part.

[0009] The testing agency conducts the first sealing test on the motor housing using the pressure reduction method. The clamping adjustment unit clamps the unqualified motor housing and rotates it backward by 90 degrees, allowing the coating mechanism to apply grease to the inner wall of the motor housing. The clamping adjustment unit is then reset, and the testing agency performs the operation again to locate the leakage point on the unqualified motor housing.

[0010] Preferably, the sealing support includes a fixing plate fixedly mounted on the lower side of the top plate by multiple evenly distributed connecting rods, a support platform fixedly mounted on the upper side of the fixing plate, and a sealing gasket installed on the upper side of the support platform.

[0011] Preferably, the detection unit includes a detector mounted on the front end of the upper surface of the top plate, a cylinder is fixedly mounted on the top plate, a sealing pressure plate that moves up and down is fixedly mounted on the telescopic end of the cylinder, and an air injection pipe is installed on the lower side of the sealing pressure plate.

[0012] Preferably, the water immersion section includes a cylinder two fixedly installed on the lower side of the testing platform. A transparent water tank with an upward opening is fixedly installed at the telescopic end of the cylinder two. A plurality of guide rods one that are slidably connected to the testing platform are evenly fixedly installed on the lower side of the transparent water tank.

[0013] Preferably, the linear conveying unit includes a guide rail installed on the lower side of the mounting platform and located above the support platform. An electric slider that moves back and forth is slidably arranged on the guide rail, and a moving platform is fixedly arranged on the lower side of the left and right symmetrical electric sliders.

[0014] Preferably, the driven lifting part includes a spring rod 1 that is symmetrically fixedly disposed on the lower side of the moving platform. A lifting slide that moves up and down is elastically slidably disposed on the symmetrical spring rod 1. Two sets of guide rods 2 are symmetrically fixedly disposed on the rear side of the lifting slide through a support 1. Each set consists of symmetrical guide rods 2.

[0015] Preferably, the clamping adjustment part includes a left-right movable clamping slide that is slidably disposed on two symmetrical guide rods. A rotary cylinder is fixedly disposed on each side of the left and right symmetrical clamping slides, and a U-shaped gripper is fixedly disposed on the drive end of the rotary cylinder.

[0016] Preferably, the clamping drive unit includes a linear groove 1 symmetrically opened on the lifting slide and corresponding to each clamping slide. The linear groove 1 extends left and right and runs through the front and back. A slide shaft 1 is fixedly provided on the front side of the clamping slide and is slidably connected to the corresponding linear groove 1. A cylinder 3 corresponding to each slide shaft 1 is symmetrically fixed on the front side of the lifting slide via a support 2. The telescopic end of the cylinder 3 is fixedly connected to the corresponding slide shaft 1 via a connecting plate 1.

[0017] Preferably, the rotary coating unit includes a motor fixedly mounted on the rear side of the fixed frame, an L-shaped rotating table fixedly mounted on the drive end of the motor, and two spring rods symmetrically and elastically sliding on the horizontal section of the L-shaped rotating table. An oiling brush is fixedly mounted on the upper end of the two symmetrical spring rods through a connecting plate.

[0018] Preferably, the lifting and replenishing unit includes two straight grooves symmetrically opened on the fixed frame. The two straight grooves are connected from front to back and extend vertically. A sliding shaft two that moves vertically is slidably connected in the two straight grooves. An oil box with an upper opening is fixedly installed at the front end of the two symmetrical sliding shafts. A connecting plate three is fixedly installed at the rear end of the two symmetrical sliding shafts. An electric push rod with a telescopic end fixedly connected to the connecting plate three is fixedly installed at the lower end of the rear side of the fixed frame through a support three.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. This invention, through the cooperation of a detection mechanism, a conveying mechanism, and a coating mechanism, can automatically unload fan motor housings that have passed the pressure drop test, or directly detect and locate leak points in unqualified housings. This eliminates the redundant steps of repeated disassembly, transfer, and secondary clamping of housings in traditional step-by-step operations, significantly shortens the detection cycle, reduces the intensity of manual intervention, and improves the overall detection efficiency. At the same time, it can directly correlate the leakage location, leakage degree, and production batch data of each housing, avoiding the separation or confusion of information about the housings, and providing a direct basis for the precise optimization of the die-casting process.

[0021] 2. This invention, through the cooperation of the detection mechanism, the conveying mechanism, and the coating mechanism, can also integrate water immersion and oil coating detection devices in the same equipment. This allows for the automatic matching of the corresponding detection mode based on the leakage data of the defective fan motor housing. The above operation method can not only take into account both detection modes simultaneously, but also avoid the difficulty of locating small gaps in the water immersion method, and reduce the number of housings to be cleaned for detection by the oil coating method. Furthermore, it can achieve automated oil coating and water immersion, eliminating the need for manual equipment switching and repeated clamping of the housing, greatly reducing manual intervention, significantly improving the overall detection efficiency, and reducing the overall labor costs. At the same time, the integrated design significantly reduces the footprint of multiple detection stations and detection equipment, thereby reducing the overall production cost. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a partial cross-sectional schematic diagram of a part of the structure of the present invention.

[0024] Figure 3 This is a partial cross-sectional schematic diagram of a portion of the testing facility's structure.

[0025] Figure 4 This is a partial cross-sectional schematic diagram of the conveying mechanism.

[0026] Figure 5 This is a partial cross-sectional schematic diagram of the coating mechanism.

[0027] In the diagram: 1. Testing table; 2. Testing mechanism; 21. Top plate; 22. Sealing support; 221. Fixing plate; 222. Support platform; 23. Testing section; 231. Testing instrument; 232. Cylinder 1; 233. Sealing pressure plate; 234. Air injection pipe; 24. Water immersion section; 241. Cylinder 2; 242. Transparent water tank; 243. Guide rod 1; 3. Conveying mechanism; 31. Mounting platform; 32. Linear conveying section; 321. Guide rail; 322. Electric slider; 323. Moving platform; 33. Driven lifting section; 3 31. Spring rod one; 332. Lifting slide; 333. Guide rod two; 34. Clamping adjustment unit; 341. Clamping slide; 342. Rotary cylinder; 343. U-shaped gripper; 35. Clamping drive unit; 351. Slide shaft one; 352. Cylinder three; 4. Coating mechanism; 41. Fixing frame; 42. Rotary coating unit; 421. Motor; 422. L-shaped rotating table; 423. Spring rod two; 424. Oil brush; 43. Lifting supply unit; 431. Slide shaft two; 432. Oil box; 433. Electric push rod. Detailed Implementation

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Please see Figure 1 An automatic detection device for the air tightness of die-cast parts for new energy vehicles is used to automatically detect the air tightness of automotive fan motor housings. It includes a detection platform 1, a detection mechanism 2 on the detection platform 1, and a conveying mechanism 3 and a coating mechanism 4 arranged at the front and rear of the detection mechanism 2.

[0030] Please see Figure 1 The testing mechanism 2 includes a top plate 21 fixedly mounted on the upper side of the testing platform 1 by a support rod. A sealing support part 22 for supporting the shell is provided between the top plate 21 and the testing platform 1. A testing part 23 is provided on the top plate 21 to cooperate with the sealing support part 22 to perform sealing and airtightness testing on the shell. A water immersion part 24 for performing water immersion testing on the testing platform 1 and located below the sealing support part 22.

[0031] Please see Figure 1 , Figure 2 and Figure 3 The sealing support part 22 includes a fixing plate 221 fixedly installed on the lower side of the top plate 21 by multiple evenly distributed connecting rods. A support platform 222 is fixedly installed on the upper side of the fixing plate 221, and a sealing gasket is installed on the upper side of the support platform 222.

[0032] Please see Figure 1 , Figure 2 and Figure 3 The detection unit 23 includes a detector 231 installed on the front end of the upper surface of the top plate 21. A cylinder 232 is fixedly installed on the top plate 21. A sealing pressure plate 233 that moves up and down is fixedly installed at the telescopic end of the cylinder 232. An air injection pipe 234 is installed on the lower side of the sealing pressure plate 233. A high-precision detection system for real-time monitoring of internal pressure changes and calculation of overall leakage is provided in the sealing pressure plate 233, the air injection pipe 234 and the detector 231.

[0033] When performing an airtightness test on the fan motor housing, the conveying mechanism 3 first moves the housing below the sealing plate 233, aligning the opening on the upper surface of the housing with the air injection pipe 234. Then, cylinder 232 moves the sealing plate 233 downwards until it is in contact with the upper surface of the housing and the air injection pipe 234 is fully inserted into the housing through the opening on the upper surface. Next, cylinder 232 continues to move the sealing plate 233 downwards until the lower end of the housing is tightly pressed against the sealing gasket on the upper side of the support platform 222, thus achieving airtightness testing. Plate 233, together with sealing gasket, stably seals the upper end face of the housing, the pressure relief hole on the upper end face, and the lower end opening of the housing. Then, a preset amount of compressed air is injected into the housing through the air injection pipe 234. The high-precision detection system in the sealing plate 233 and the detector 231 monitors the pressure change inside the housing in real time and calculates the overall leakage. Finally, it determines whether the airtightness of the fan motor housing meets the standard based on the set threshold. The detector 231 is an existing detection system, and the air injection pipe 234 is connected to an existing air pump to achieve quantitative air injection.

[0034] Please see Figure 1 and Figure 2 The water immersion part 24 includes a cylinder 241 fixedly installed on the lower side of the testing platform 1. A transparent water tank 242 with an upward opening is fixedly installed at the telescopic end of the cylinder 241. A plurality of guide rods 243 that are slidably connected to the testing platform 1 are evenly fixedly installed on the lower side of the transparent water tank 242.

[0035] When the air pressure leakage of the fan motor housing is detected to be significantly higher than the set threshold, the transparent water tank 242 containing a certain amount of clean water and the guide rod 243 are moved upward by the cylinder 241 until the clean water completely submerges the housing that is positioned and sealed on the support platform 222. At this time, a certain amount of compressed air is continuously injected into the housing through the air injection pipe 234, and the position of the continuously escaping air bubbles on the side wall of the housing is carefully observed, so as to accurately locate the position of the larger defect on the side wall of the housing.

[0036] Please see Figure 1 and Figure 2 The conveying mechanism 3 includes a mounting platform 31 symmetrically fixed on the lower side of the top plate 21. The mounting platform 31 is provided with a linear conveying part 32 for conveying the front and rear housings. The linear conveying part 32 is provided with a driven lifting part 33 that cooperates with the detection part 23 to position the housing. The driven lifting part 33 is provided with a clamping adjustment part 34 for rotating and adjusting the housing and a clamping drive part 35 for driving the clamping adjustment part 34 to position and clamp the housing.

[0037] Please see Figure 2 and Figure 3 The linear conveying unit 32 includes a guide rail 321 installed on the lower side of the mounting platform 31 and located above the support platform 222. An electric slider 322 that moves back and forth is slidably arranged on the guide rail 321. A moving platform 323 is fixedly arranged on the lower side of the left and right symmetrical electric sliders 322.

[0038] Please see Figure 2 , Figure 3 and Figure 4 The driven lifting part 33 includes a spring rod 331 that is symmetrically fixed on the lower side of the moving platform 323. A lifting slide 332 that moves up and down is elastically slidably mounted on the symmetrical spring rod 331. Two sets of guide rods 333 are symmetrically fixed on the rear side of the lifting slide 332 through a support. Each set consists of symmetrical guide rods 333.

[0039] Please see Figure 2 , Figure 3 and Figure 4 The clamping adjustment part 34 includes a left-right movable clamping slide 341 that is slidably disposed on the upper and lower symmetrical guide rods 333. A rotary cylinder 342 is fixedly disposed on the opposite side of the left and right symmetrical clamping slides 341, and a U-shaped gripper 343 is fixedly disposed on the driving end of the rotary cylinder 342.

[0040] Please see Figure 2 and Figure 4The clamping drive unit 35 includes a straight groove 1 that is symmetrically opened on the lifting slide 332 and corresponds to the clamping slide 341. The straight groove 1 extends left and right and runs through front and back. A slide shaft 351 that is slidably connected to the corresponding straight groove 1 is fixedly provided on the front side of the clamping slide 341. A cylinder 352 that corresponds to the slide shaft 351 is symmetrically fixed on the front side of the lifting slide 332 through a support 2. The telescopic end of the cylinder 352 is fixedly connected to the corresponding slide shaft 351 through a connecting plate 1.

[0041] When the fan motor housing needs to be clamped and adjusted, cylinder 352 retracts, driving connecting plate 1 and its corresponding sliding shaft 351 to slide along the corresponding straight groove 1. This causes sliding shaft 351 to drive the left and right symmetrical clamping slides 341 to move relative to each other along guide rod 2 333. The clamping slides 341 then drive the left and right symmetrical rotating cylinders 342 and U-shaped grippers 343 to move relative to each other synchronously until the U-shaped grippers 343 are stably clamped at a specific position on the housing. At the same time, the rotating cylinder 342 can drive the U-shaped grippers 343 and the clamped and positioned housing to rotate backward by 90 degrees, so that the lower opening of the housing is stably facing backward.

[0042] When the airtightness of the fan motor housing is to be tested, the electric slider 322 drives the moving platform 323 to move backward a certain distance along the guide rail 321. The spring rod 331 then drives the clamping slide 341 and the U-shaped gripper 343 to move backward synchronously through the lifting slide 332 until the opening on the upper end of the housing is aligned with the air injection pipe 234. During the process of the sealing plate 233 moving downward to press the upper end of the housing, the U-shaped gripper 343 holding the housing moves downward synchronously along the spring rod 331 through the clamping slide 341 to the lifting slide 332 until the housing is completely sealed and positioned on the support platform 222. At this time, the cylinder 352 drives the U-shaped gripper 343 to temporarily release the contact with a specific position on the side wall of the housing to avoid obscuring and sealing the defect position on the side wall of the housing.

[0043] When the fan motor housing is inspected and found to be qualified, the housing is first stably clamped again by the U-shaped gripper 343. Then, the sealing plate 233 is moved upward and reset by the cylinder 232. Under the elastic action of the spring rod 331, the lifting slide 332 simultaneously moves the U-shaped gripper 343 and the housing upward and resets to the highest position. At this time, the continuously moving sealing plate 233 and air injection pipe 234 are completely separated from the housing. Then, the electric slider 322 moves the U-shaped gripper 343 and the housing forward until they are completely separated from the top of the fixing plate 221 and the transparent water tank 242. At this time, the clamping of the U-shaped gripper 343 can be released to unload the qualified housing. Then, the housing to be inspected can be automatically clamped.

[0044] Please see Figure 1 and Figure 2 The coating mechanism 4 includes a fixed frame 41 fixedly installed on the lower side of the top plate 21 and located behind the fixed plate 221. The fixed frame 41 is provided with a rotary coating part 42 for automatically applying oil to the inside of the housing and a lifting supply part 43 for replenishing oil to the rotary coating part 42.

[0045] Please see Figure 2 and Figure 5 The rotary coating unit 42 includes a motor 421 fixedly mounted on the rear side of the fixed frame 41. An L-shaped rotating table 422 is fixedly mounted on the drive end of the motor 421. Spring rods 423 are symmetrically and elastically slidably mounted on the horizontal section of the L-shaped rotating table 422. An oil brush 424 is fixedly mounted on the upper end of the symmetrical spring rods 423 through a connecting plate.

[0046] When applying sufficient grease to the inner sidewall of the housing, the housing is first clamped again by the U-shaped gripper 343 and the sealing plate 233 is driven upward by the cylinder 232. At this time, the U-shaped gripper 343 drives the housing to move upward along the spring rod 331 to the highest position. Then, the rotating cylinder 342 drives the U-shaped gripper 343 and the housing to rotate 90 degrees backward, so that the lower opening of the housing faces backward stably. Then, the electric slider 322 drives the housing to move backward a certain distance until the grease-absorbing brush 424 is fully inserted into the housing and stably attached to the inner sidewall of the housing under the action of the spring rod 423. At this time, the motor 421 drives the L-shaped turntable and the spring rod 423 to rotate slowly. The spring rod 423 then drives the grease-absorbing brush 424 to evenly coat the inner sidewall of the housing until sufficient grease is applied to the inner sidewall of the housing.

[0047] When the air pressure leakage of the fan motor housing is detected to be slightly higher than the set threshold, the housing is first moved and adjusted by the U-shaped gripper 343, and the oiling brush 424 is used to evenly coat the inner side wall of the housing with a sufficient amount of grease. Then, the housing is moved and adjusted again by the U-shaped gripper 343, and the housing is stably sealed and positioned on the support platform 222 by the sealing plate 233. Then, a fixed amount of compressed air is continuously injected into the housing, and the location of the continuous escape of air bubbles or the appearance of oil film on the side wall of the housing is carefully observed, so as to accurately locate the location of the small defects on the side wall of the housing.

[0048] The above-described operation method can not only automate the unloading of qualified fan motor housings, but also directly detect and locate leaks in unqualified housings, eliminating the redundant steps of repeated disassembly, transfer, and secondary clamping of housings in traditional step-by-step operations, thus improving the overall detection efficiency and providing a direct basis for the precise optimization of the die-casting process. Furthermore, it can automatically handle two detection modes simultaneously, avoiding the difficulty of locating small gaps by the water immersion method and reducing the number of housings to be cleaned by the oiling method. This significantly reduces the space occupied by multiple detection stations and detection equipment, thereby lowering the overall production cost.

[0049] Please see Figure 2 and Figure 5 The lifting and supply unit 43 includes two straight grooves symmetrically opened on the fixed frame 41. The two straight grooves are connected front and back and extend vertically. A sliding shaft 431 that moves vertically is slidably connected in the two straight grooves. An oil box 432 with an upper opening is fixedly installed at the front end of the two symmetrical sliding shafts 431. A connecting plate 3 is fixedly installed at the rear end of the two symmetrical sliding shafts 431. An electric push rod 433 with a telescopic end fixedly connected to the connecting plate 3 is fixedly installed at the lower end of the rear side of the fixed frame 41 through the support 3.

[0050] When it is necessary to replenish the grease adsorbed on the oiling brush 424, the motor 421 first drives the oiling brush 424 to rotate to the lowest side. Then, the electric push rod 433 drives the connecting plate 3 and the sliding shaft 2 431 to move upward along the straight groove 2. The sliding shaft 2 431 then drives the oil box 432 containing a certain amount of grease to move upward synchronously until the oiling brush 424 is immersed in the grease in the oil box 432, thereby completing the replenishment of the grease on the oiling brush 424.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automatic detection device for the airtightness of die-cast parts for new energy vehicles, used for automatically detecting the airtightness of automotive fan motor housings, comprising a detection platform, characterized in that: The testing platform is equipped with a testing mechanism, and the testing mechanism is equipped with a conveying mechanism and a coating mechanism at the front and rear. The testing mechanism includes a top plate fixedly mounted on the upper side of the testing platform by a support rod, a sealing support part for supporting the shell is provided on the lower side of the top plate, a testing part for testing the air tightness of the shell in conjunction with the sealing support part is provided on the top plate, and a water immersion part for immersing the shell in water is provided on the testing platform and below the sealing support part. The conveying mechanism includes mounting platforms that are symmetrically fixed on the lower side of the top plate. The mounting platform is provided with a linear conveying section for the front and rear conveying housings. The linear conveying section is provided with a driven lifting section that cooperates with the detection section to position the housing. The driven lifting section is provided with a clamping adjustment section for rotating the housing and a clamping drive section for driving the clamping adjustment section to position the clamping housing. The coating mechanism includes a fixed frame that is fixedly installed on the lower side of the top plate and located behind the sealing support. The fixed frame is equipped with a rotary coating part that automatically applies oil to the inside of the housing and a lifting supply part that replenishes the oil to the rotary coating part. The testing agency conducts the first sealing test on the motor housing using the pressure reduction method. The clamping adjustment unit clamps the unqualified motor housing and rotates it backward by 90 degrees, allowing the coating mechanism to apply grease to the inner wall of the motor housing. The clamping adjustment unit is then reset, and the testing agency performs the operation again to locate the leakage point on the unqualified motor housing.

2. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 1, characterized in that: The sealing support includes a fixing plate fixedly installed on the lower side of the top plate by multiple evenly distributed connecting rods, a support platform fixedly installed on the upper side of the fixing plate, and a sealing gasket installed on the upper side of the support platform.

3. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 1, characterized in that: The detection unit includes a detector installed on the front end of the upper surface of the top plate. A cylinder is fixedly installed on the top plate. A sealing pressure plate that moves up and down is fixedly installed on the telescopic end of the cylinder. An air injection pipe is installed on the lower side of the sealing pressure plate.

4. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 1, characterized in that: The water immersion section includes a cylinder two fixedly installed on the lower side of the testing platform. A transparent water tank with an upward opening is fixedly installed at the telescopic end of the cylinder two. Multiple guide rods one that are slidably connected to the testing platform are evenly fixedly installed on the lower side of the transparent water tank.

5. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 2, characterized in that: The linear conveying unit includes a guide rail installed on the lower side of the mounting platform and located above the support platform. An electric slider that moves back and forth is slidably mounted on the guide rail, and a moving platform is fixedly mounted on the lower side of the left and right symmetrical electric sliders.

6. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 5, characterized in that: The driven lifting part includes a spring rod 1 that is symmetrically fixed on the lower side of the moving platform. A lifting slide that moves up and down is elastically slidably mounted on the symmetrical spring rod 1. Two sets of guide rods 2 are symmetrically fixed on the rear side of the lifting slide through a support 1. Each set consists of two guide rods 2 that are symmetrically mounted up and down.

7. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 6, characterized in that: The clamping adjustment unit includes a left-right movable clamping slide that is slidably mounted on two symmetrical guide rods. A rotary cylinder is fixedly mounted on each side of the left and right symmetrical clamping slides, and a U-shaped gripper is fixedly mounted on the drive end of the rotary cylinder.

8. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 7, characterized in that: The clamping drive unit includes a linear groove 1 symmetrically opened on the lifting slide and corresponding to each clamping slide. The linear groove 1 extends left and right and runs through the front and back. A slide shaft 1 is fixedly installed on the front side of the clamping slide and is slidably connected to the corresponding linear groove 1. A cylinder 3 corresponding to each slide shaft 1 is symmetrically fixed on the front side of the lifting slide via a support 2. The telescopic end of the cylinder 3 is fixedly connected to the corresponding slide shaft 1 via a connecting plate 1.

9. The automatic airtightness testing device for die-cast parts of new energy vehicles according to claim 1, characterized in that: The rotary coating unit includes a motor fixedly mounted on the rear side of the fixed frame. An L-shaped rotating table is fixedly mounted on the drive end of the motor. Spring rods symmetrically and elastically slide on the horizontal section of the L-shaped rotating table. An oiling brush is fixedly mounted on the upper end of the symmetrical spring rods via a connecting plate.

10. An automatic detection device for the airtightness of die-cast parts for new energy vehicles according to claim 1, characterized in that: The lifting and supply unit includes two straight grooves symmetrically opened on the fixed frame. The two straight grooves are connected front to back and extend vertically. A sliding shaft two that moves vertically is slidably connected inside the two straight grooves. An oil box with an upper opening is fixedly installed at the front end of the two symmetrical sliding shafts. A connecting plate three is fixedly installed at the rear end of the two symmetrical sliding shafts. An electric push rod with a telescopic end fixedly connected to the connecting plate three is fixedly installed at the lower end of the rear side of the fixed frame through a support three.

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