Leakage detection method for aluminum alloy shell

Abstract

The invention relates to the technical field of compressor shell processing, and discloses an aluminum alloy shell leakage detection method, which comprises the following steps of S1, placing a shell to be detected on a sealing detection mechanism; s2, sealing operation is conducted on the shell and the vacuum cover, and the sealing performance is ensured; s3, evacuating air in the vacuum cover, and filling high-pressure gas into the shell; s4, after the inflation and exhaust processes are finished, a differential pressure sensor is used for monitoring the pressure change condition between the shell and the vacuum cover; s5, whether the leakage amount of the shell exceeds the standard or not is judged according to the monitoring data; s6, if the leakage amount does not exceed the standard, the shell is taken down from the sealing detection mechanism; and S7, if the leakage amount exceeds the standard, the leakage position of the shell is detected through the wet method detection unit, and then the shell is taken down from the sealing detection mechanism. According to the technical scheme of the invention, the precision and reliability of the air tightness detection of the shell can be remarkably improved, and the interference of external environmental factors on the detection process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressor casing processing, and in particular to a leak detection method for an aluminum alloy casing. Background Art

[0002] Aluminum alloy materials have been widely used in many industrial fields due to their advantages such as light weight, good strength and good corrosion resistance. In particular, aluminum alloy shells have become common structural components in compressor manufacturing. When the compressor is running, the aluminum alloy shell needs to withstand a certain pressure, and its internal gas sealing is crucial to the performance and reliability of the compressor.

[0003] However, in the casting process of aluminum alloy shells, due to the interaction of multiple factors such as alloy composition, smelting process, casting conditions and mold quality, various defects such as pores and looseness are easily generated, which seriously damages the airtightness of the shell and poses a hidden danger to the quality and performance of subsequent products.

[0004] Currently, in the Figure 1 When the aluminum alloy shell shown in the figure is tested for air tightness, the method commonly used in the industry is to install the shell 1 on the detection device, and use the device to block the bottom, top and side of the shell 1, so as to form a closed space inside the shell 1. Subsequently, high-pressure gas is injected into the shell 1. After the ventilation is completed, only the pressure sensor arranged inside the shell 1 is used to monitor the internal pressure change, so as to determine whether the shell 1 has a leak. However, this traditional leak detection method has obvious disadvantages. First, from the perspective of detection accuracy, there are great limitations in monitoring pressure changes by only relying on the pressure sensor inside the shell 1. When a small leak occurs in the shell 1, due to the small amount of leaked gas, the internal pressure change amplitude is extremely small. The existing pressure sensor is difficult to accurately detect these subtle pressure changes, which greatly increases the risk of missing small leaks and cannot meet the strict requirements of today's industrial production for high-precision detection. Secondly, considering the influencing factors of the detection environment, the outside of the shell 1 is directly in contact with the surrounding air. During the detection process, it is easily disturbed by external environmental factors such as atmospheric pressure fluctuations, ambient temperature changes and air flow, which makes the existing detection method significantly reduced in reliability and stability, and seriously hinders quality control and product performance improvement in the production process. Summary of the invention

[0005] The present invention aims to provide a method for leak detection of an aluminum alloy shell, so as to solve the problems of low detection accuracy and susceptibility to interference by external environmental factors in the existing leak detection technology of aluminum alloy shells.

[0006] To achieve the above object, the present invention adopts the following technical solution: a method for detecting leakage of an aluminum alloy shell, comprising the following steps: S1: Place the housing to be tested on the sealing testing mechanism; S2: Sealing operation is performed on the shell and the vacuum cover to ensure the sealing performance; S3: evacuate the air in the vacuum cover and fill the shell with high-pressure gas; S4: After the inflation and degassing process is completed, the differential pressure sensor is used to monitor the pressure change between the shell and the vacuum cover; S5: Determine whether the leakage of the shell exceeds the standard based on the monitoring data; S6: If the leakage does not exceed the standard, remove the housing from the sealing detection mechanism; S7: If the leakage exceeds the standard, the wet detection unit is used to detect the leakage position of the shell, and then the shell is removed from the sealing detection mechanism.

[0007] The beneficial effects of this solution are as follows: in this technical solution, by using a differential pressure sensor to monitor the pressure changes between the shell and the vacuum cover, it can more keenly capture tiny pressure differences compared to the traditional method of relying solely on the pressure sensor inside the shell, effectively solving the problem of difficulty in detection due to the small amount of leaked gas, greatly reducing the risk of missing tiny leaks, and meeting the strict requirements of modern industrial production for high-precision detection, thereby ensuring the quality and performance reliability of aluminum alloy shells when used in various industrial fields.

[0008] Placing the shell to be tested in a sealed testing mechanism and evacuating the air in the vacuum cover makes the external environment of the shell relatively stable, avoiding interference from external environmental factors such as atmospheric pressure fluctuations, ambient temperature changes, and air flow, and improving the reliability and stability of the test results. This makes the test data more accurate and reliable, helps to implement quality control more accurately during the production process, improves the overall quality level of the product, and reduces unnecessary production cost increases and reduced production efficiency caused by test errors.

[0009] When the leakage volume is detected to be excessive, the wet detection unit can accurately determine the leakage location, which is of great significance for the subsequent repair and improvement of the aluminum alloy shell. Enterprises can deal with the parts with leakage problems in a targeted manner, improve the repair efficiency, reduce the product scrap rate caused by leakage problems, further save production costs, and also help optimize the production process of aluminum alloy shells, reduce the generation of defects from the source, and enhance the market competitiveness of products.

[0010] Furthermore, in S1, before placing the shell to be inspected on the sealing inspection mechanism, the barcode on the shell is scanned by a scanner.

[0011] The beneficial effect of this solution is that the shell barcode information is scanned before detection, which is conducive to tracing the information of the shell.

[0012] Further, S2 comprises the following steps: S2.1: perform sealing operation on the upper and lower ends of the shell; S2.2: Set up a vacuum cover and seal the upper and lower ends of the vacuum cover; S2.3: Seal the sides of the shell and the vacuum cover.

[0013] The beneficial effects of this solution are as follows: by sealing and plugging the upper and lower ends of the shell, the upper and lower ends of the vacuum cover, and the sides of the shell and the vacuum cover, a comprehensive and tight sealing system is formed, which minimizes the possibility of gas leakage, thereby ensuring the stability of the pressure environment during subsequent testing, providing a reliable basic condition for high-precision airtightness testing, effectively avoiding detection errors caused by lax sealing, and improving the accuracy and reliability of the test results.

[0014] Further, in S1, the sealing detection mechanism includes a bearing unit and an air path sealing unit, the air path sealing unit is arranged on the bearing unit, and the shell is placed on the air path sealing unit.

[0015] The beneficial effects of this solution are: the air path sealing unit is integrated on the carrying unit, making the layout of the entire sealing detection mechanism more compact and reasonable, reducing unnecessary connecting components and space occupancy, which is not only convenient for installation and operation in the production site, but also improves the efficiency and stability of the detection process.

[0016] Further, in S2.1, a top sealing unit slidably arranged on the bearing unit is used to seal the top of the shell, and an air path sealing unit is used to seal the bottom of the shell.

[0017] The beneficial effects of this solution are as follows: the special sealing treatment performed by the top plugging unit on the top of the shell and the gas path sealing unit on the bottom of the shell can closely fit the shape and surface of the shell, accurately fill potential gaps, and thus build a stable and reliable sealing structure. Compared with a single sealing method, this top-down coordinated sealing mode greatly reduces the possibility of gas leakage, and effectively ensures that during the detection process, both the high-pressure gas injection stage and the pressure monitoring link can be carried out in an orderly manner under stable and safe sealing conditions. In this way, the accuracy and reliability of the test results can be significantly improved, laying a solid foundation for accurately determining the airtightness of aluminum alloy shells.

[0018] Moreover, this ingenious sealing design specifically for the upper and lower ends of the shell gives the sealing detection mechanism excellent adaptability, enabling it to flexibly cope with aluminum alloy shells of different thicknesses, greatly broadening its scope of application and effectively meeting diverse production inspection needs.

[0019] Further, in S2.2, the vacuum hood is placed on the shell by using a lifting part slidably arranged on the top sealing unit, and the top of the vacuum hood is sealed by the top sealing unit, and the bottom of the vacuum hood is sealed by the air path sealing unit.

[0020] The beneficial effects of this solution are: the vacuum cover is installed by sliding the lifting part on the top plugging unit, and the top and bottom of the vacuum cover are sealed respectively in combination with the top plugging unit and the gas path sealing unit, so that the installation and sealing process of the vacuum cover are cleverly integrated together to form a set of coherent and efficient operation procedures. This reduces the complexity and time consumption caused by operating multiple components separately, making the preparation work before the entire sealing test more convenient and rapid, significantly improving production efficiency, and is particularly suitable for large-scale aluminum alloy shell leak detection operations.

[0021] Furthermore, in S2.3, a lateral blocking unit is used to block the side surface of the shell and the side surface of the vacuum cover.

[0022] The beneficial effects of this solution are: the side sealing unit is used to seal the side of the shell and the side of the vacuum cover, which can effectively seal the holes on the side of the shell and the side of the vacuum cover to form an all-round sealing system. This greatly reduces the channels for gas leakage and ensures that during the detection process, whether it is the filling of high-pressure gas or the maintenance of the vacuum environment, a stable pressure state can be maintained, reducing pressure fluctuations caused by lax sealing, thereby improving the accuracy and reliability of the test results, ensuring the accuracy of the airtightness test of the aluminum alloy shell, and helping to screen out high-quality products.

[0023] Furthermore, in S3, the air path sealing unit is provided with an air inlet channel communicating with the interior of the shell and an air exhaust channel communicating with the interior of the vacuum cover. The inflation device introduces high-pressure gas into the shell through the air inlet channel; the air exhaust device extracts the air in the vacuum cover through the air exhaust channel, so that a negative pressure state is formed in the vacuum cover.

[0024] The beneficial effects of this solution are as follows: an air inlet channel communicating with the inside of the shell and an air extraction channel communicating with the inside of the vacuum cover are directly arranged on the gas path sealing unit, making the gas transmission path more direct and simple. The inflation device can quickly and efficiently introduce high-pressure gas into the shell, and the air extraction device can also quickly extract the air in the vacuum cover to form a negative pressure state, reducing energy loss and time waste during gas transmission, thereby speeding up the preparation work before detection and improving the overall detection efficiency. In large-scale production detection, it helps to significantly increase the number of leak detections of aluminum alloy shells per unit time.

[0025] Further, in S5, the leakage of the housing is ≤0.4cc / min.

[0026] The beneficial effects of this solution are: it clearly stipulates that the leakage of the shell is ≤0.4cc / min, sets precise and strict standards for the airtightness of the aluminum alloy shell, and helps to accurately screen out products that meet high quality requirements during the production process, avoiding potential safety hazards and performance problems caused by shells with poor airtightness entering subsequent use links.

[0027] Further, in S7, before using the wet detection unit to detect the leakage position of the shell, first remove the lateral sealing unit on the shell and the vacuum cover, then remove the vacuum cover, and then use the lateral sealing unit to seal the side of the shell, and then use the wet detection unit to detect the leakage position of the shell.

[0028] The beneficial effect of this solution is that before the wet method test, the vacuum cover is first removed, and then the side of the shell is sealed by the side sealing unit, so that a sealed space is formed inside the shell while the shell is exposed to the air. This method can visually observe the leakage position of the shell and facilitate accurate marking. This not only improves the accuracy of leak detection, but also provides a clear target for subsequent repair work, reduces the time and labor cost required to troubleshoot and repair leak problems, and effectively improves production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the main three-dimensional diagram of the existing aluminum alloy shell; Figure 2 It is a three-dimensional upward view of the existing aluminum alloy shell; Figure 3 This is a flow chart of a method for detecting leakage of an aluminum alloy shell in Example 1 of the present invention; Figure 4 A three-dimensional diagram of the aluminum alloy housing leak detection device in Example 1 of the present invention; Figure 5 A three-dimensional diagram of the sealing detection mechanism in Example 1 of the present invention; Figure 6 A three-dimensional diagram of the blocking portion in Example 1 of the present invention; Figure 7 A three-dimensional diagram of the bearing unit and the gas path sealing unit in Example 1 of the present invention; Figure 8 for Figure 7 A partial enlarged view of the middle A; Fig. 9 A three-dimensional diagram of the lateral blocking unit in Example 1 of the present invention; Fig.10 It is a three-dimensional diagram of the sealing detection mechanism and the wet detection unit in Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: housing 1, arc hole 2, connecting hole 3, round hole 4, blind hole 5, chassis 6, No. 1 switch door 7, safety grating 8, top plate 9, bearing plate 10, support column 11, No. 1 driving member 12, connecting plate 13, push plate 14, connecting column 15, connecting rod 16, No. 1 connecting disk 17, No. 2 connecting disk 18, blocking disk 19, No. 2 sealing ring 20, No. 1 guide sleeve 21, vacuum cover 22, No. 2 driving member 23, lifting plate 24, driving plate 25, guide rod 26, No. 2 guide sleeve 27, guide plate 28, No. 1 guide column 29, No. 3 guide sleeve 30, guide hole 31, ventilation plate 32, positioning seat 33, rubber ring 34, No. 3 sealing ring 35, No. 4 sealing ring 36, No. 1 air inlet 37, No. 2 air inlet 38, No. 1 exhaust hole 39, No. 2 exhaust hole 40, No. 1 positioning column 41, No. 2 positioning column 42, guide bar 43, No. 2 guide column 44, mounting plate 45, L-shaped positioning bar 46, No. 1 mounting seat 47, No. 2 mounting seat 48, No. 3 driving member 49, No. 4 driving member 50, "I"-shaped push rod 51, slider 52, slide rail 53, blocking rod 54, fixed section 55, blocking section 56, limit section 57, connecting section 58, No. 5 sealing ring 59, No. 6 sealing ring 60, No. 2 switch door 61, No. 5 driving member 62, water tank 63, sliding plate 64, No. 4 guide sleeve 65, slide rod 66, sight glass 67, barcode scanner 68.

[0031] Example 1 like Figure 1 As shown, the existing aluminum alloy shell 1 is a cylindrical structure with the bottom and the top connected. Six arc holes 2 are opened on the upper side of the shell 1 and penetrate to the bottom. Each arc hole 2 is provided with a partition bar, so as to divide the arc hole 2 at the bottom of the shell 1 into two parts. A total of 12 arc holes 2 are formed at the bottom of the shell 1. The partition bar is integrally formed with the shell 1. A connecting hole 3 is opened on the left side of the shell 1, and the connecting hole 3 is connected to one of the arc holes 2. Figure 2 As shown, the front side of the housing 1 is provided with two symmetrically distributed circular holes 4 and two symmetrically distributed blind holes 5 .

[0032] like Figure 4 The aluminum alloy housing leak detection device shown includes a chassis 6, a wet detection unit and a sealing detection mechanism.

[0033] like Figure 4As shown, a sealing detection mechanism installation area is provided on the upper left side of the chassis 6, and a No. 1 switch door 7 is hinged on the chassis 6 on the left side and the rear side of the sealing detection mechanism. This technology provides convenient conditions for the maintenance and repair of the sealing detection mechanism. The chassis 6 on the front side of the sealing detection mechanism adopts an open structure, and safety gratings 8 are installed on the left and right sides of the front side of the chassis 6. The setting of the safety grating 8 can effectively avoid accidental contact incidents when personnel approach the working area of ​​the chassis 6, and effectively prevent the occurrence of mechanical injuries such as pinching, thereby effectively ensuring the personal safety of personnel. A barcode scanner 68 is installed on the right side of the safety grating 8.

[0034] like Figure 5 As shown, the sealing detection mechanism includes a bearing unit, a top sealing unit, a vacuum lifting unit and an air path sealing unit.

[0035] like Figure 4-5 As shown, the bearing unit includes a top plate 9 and a bearing plate 10. The top plate 9 is firmly connected to the top of the inside of the chassis 6 by bolts. Support columns 11 are installed at the four corners of the bottom of the top plate 9 by bolts, and the lower end of each support column 11 is fixed to the bearing plate 10 by welding, thereby constructing a stable and reliable bearing structure.

[0036] like Figure 4-6As shown, the top blocking unit is mounted on the bearing unit in a sliding manner, and its main function is to effectively seal the top of the housing 1 placed in the vacuum cover 22 and the top of the vacuum cover 22. Specifically, the top blocking unit includes a No. 1 driving member 12, a connecting plate 13 and a push plate 14. A mounting hole is provided on the top of the chassis 6, and the No. 1 driving member 12 is mounted on the top of the top plate 9. Its output shaft passes through the top plate 9 and is fixed to the connecting plate 13 by bolt connection. The four corner positions at the bottom of the connecting plate 13 are all bolted with connecting columns 15, and the lower ends of each connecting column 15 are welded to the upper side of the push plate 14. A blocking portion is provided at the bottom of the push plate 14, and the blocking portion includes a connecting rod 16 and a blocking disk 19. The upper end of the connecting rod 16 is integrally formed with a No. 1 connecting disk 17, and the lower end of the connecting rod 16 is integrally formed with a No. 2 connecting disk 18. The No. 1 connecting disk 17 is connected to the bottom of the push plate 14 by bolts, and the No. 2 connecting disk 18 is connected to the top of the blocking disk 19 by bolts. Furthermore, in order to improve the installation efficiency and installation accuracy of the plugging part, a No. 1 positioning groove is provided at the bottom of the push plate 14, the upper end of the connecting rod 16 extends to the top of the No. 1 connecting disk 17, and a No. 2 positioning groove is provided at the top of the plugging disk 19, and the lower end of the connecting rod 16 extends to the bottom of the No. 2 connecting disk 18. With such a design, the upper end of the connecting rod 16 cooperates with the No. 1 positioning groove to accurately and quickly determine the installation position of the No. 1 connecting disk 17 at the bottom of the push plate 14; the lower end of the connecting rod 16 cooperates with the No. 2 positioning groove to accurately and quickly determine the installation position of the No. 2 connecting disk 17 at the top of the plugging disk 19. A No. 1 sealing ring is glued to the bottom of the plugging disk 19, and the No. 1 sealing ring is used to seal the top of the shell 1, and the sealing position is on the shell 1 outside the arc hole 2, so as to construct a closed space inside the shell 1 and inside the arc hole 2; a No. 2 sealing ring 20 is glued to the top of the plugging disk 19, and the No. 2 sealing ring 20 is used to seal the top inside the vacuum cover 22. The push plate 14 is slidably set on the support column 11. Specifically, the four corner positions of the upper side of the push plate 14 are all equipped with a No. 1 guide sleeve 21 running through the bottom thereof by bolts. The No. 1 guide sleeve 21 is slidably matched with the support column 11. With the help of the No. 1 driving member 12, the push plate 14 can be driven to slide on the support column 11, thereby accurately pressing the sealing disk 19 on the top of the shell 1.

[0037] like Figure 5As shown, the vacuum lifting unit is slidably arranged on the top sealing unit, and includes a vacuum cover 22 and a lifting part. The lifting part can drive the vacuum cover 22 to perform lifting movements, so that the vacuum cover 22 can be covered on the outside of the shell 1, and a differential pressure sensor is installed between the vacuum cover 22 and the shell 1. Specifically, the lifting part includes a No. 2 driving member 23 and a lifting plate 24. The No. 2 driving member 23 is installed on the top of the push plate 14 by bolts. A driving plate 25 is installed on the output shaft of the No. 2 driving member 23 by bolts. Guide rods 26 are welded at the four corner positions of the bottom of the driving plate 25. Four No. 2 guide sleeves 27 are installed on the upper side of the push plate 14 by bolts. The No. 2 guide sleeve 27 is connected with the bottom of the push plate 14. The guide rods 26 correspond to the No. 2 guide sleeves 27 one by one. The guide rods 26 pass through the No. 2 guide sleeves 27 and are welded to the upper side of the lifting plate 24. The vacuum cover 22 is installed at the bottom of the lifting plate 24 by bolts. The vacuum cover 22 is driven down by the No. 2 driving member 23, and the vacuum cover 22 is placed on the shell 1, and it is ensured that the top of the vacuum cover 22 is tightly fitted with the No. 2 sealing ring 20 to achieve effective sealing of the top of the vacuum cover 22.

[0038] Furthermore, in order to enhance the stability of the lifting part, a guide unit is provided between the lifting plate 24 and the vacuum cover 22, and the vacuum cover 22 is mounted on the guide unit. Figure 5 As shown, the guide unit includes a guide plate 28 and four No. 1 guide columns 29. The guide plate 28 is connected to the bottom of the lifting plate 24 by bolts. The vacuum cover 22 is installed at the bottom of the guide plate 28 by bolts. The lifting plate 24 and the guide plate 28 are provided with through holes for the plugging part to pass through. The lower end of the No. 1 guide column 29 is installed on the gas path sealing unit. Four No. 3 guide sleeves 30 are installed at the four corners of the bottom of the guide plate 28 by bolts. The No. 3 guide sleeves 30 are connected to the top of the guide plate 28. Four guide holes 31 are provided on the push plate 14. The No. 1 guide column 29 is slidably arranged in the No. 3 guide sleeves 30 and the guide holes 31.

[0039] like Figure 5 As shown, the air path sealing unit is arranged on the top of the supporting plate 10, which can locate the placement position of the shell 1 and effectively seal the bottom of the shell 1 and the bottom of the vacuum cover 22, and the air path sealing unit is provided with an air intake channel communicating with the interior of the shell 1 and an air exhaust channel communicating with the interior of the vacuum cover 22.

[0040] like Figure 7-8As shown, the gas path sealing unit includes a vent plate 32, which is installed on the top of the bearing plate 10 by bolts. A positioning seat 33 for positioning the housing 1 is installed on the top of the bearing plate 10 by bolts. A No. 7 sealing ring is arranged between the positioning seat 33 and the vent plate 32. The No. 7 sealing ring can seal the bottom of the positioning seat 33. When the housing 1 is ventilated, the gas is effectively prevented from leaking from the bottom of the positioning seat 33 to the vacuum cover 22. A rubber ring 34 is glued to the side of the positioning seat 33. When the housing 1 is placed, the rubber ring 34 can prevent the positioning seat 33 from scratching the inner wall of the housing 1. The upper side of the vent plate 32 is provided with a concentric No. 1 annular groove and a No. 2 annular groove. Both the No. 1 annular groove and the No. 2 annular groove are concentrically arranged with the positioning seat 33. A No. 3 sealing ring 35 is glued in the No. 1 annular groove for sealing the bottom of the housing 1. The sealing position is on the housing 1 outside the arc hole 2. A No. 4 sealing ring 36 is glued in the No. 2 annular groove to seal the bottom of the vacuum cover 22; a No. 1 air inlet hole 37 is opened on the top of the positioning seat 33, and a No. 2 air inlet hole 38 is opened on the right side of the ventilation plate 32. The No. 1 air inlet hole 37 is connected with the No. 2 air inlet hole 38 to form an air inlet channel for introducing high-pressure gas into the shell 1. A No. 1 exhaust hole 39 is opened on the ventilation plate 32 between the No. 3 sealing ring 35 and the No. 4 sealing ring 36, and a No. 2 exhaust hole 40 is opened on the right side of the ventilation plate 32. The No. 1 exhaust hole 39 is connected with the No. 2 exhaust hole 40 to form an exhaust channel for extracting air from the vacuum cover 22 and creating a negative pressure environment in the vacuum cover 22. A No. 1 positioning column 41 is installed on the left and right sides of the upper side of the ventilation plate 32 by bolts, and the No. 1 positioning column 41 corresponds to the circular hole 4 at the bottom of the shell 1. The front and rear sides of the upper side of the vent plate 32 are both bolted with No. 2 positioning columns 42, which correspond to the blind holes 5 at the bottom of the housing 1. A guide bar 43 is bolted to the upper side of the vent plate 32, and two No. 2 guide columns 44 are bolted to the vent plate 32 on the opposite side of the guide bar 43, and the guide bar 43 and the No. 2 guide column 44 are used to guide the vacuum cover 22.

[0041] Furthermore, in order to facilitate the replacement of the air path sealing unit to adapt to the detection requirements of different types of shells, the air path sealing unit also includes a mounting plate 45, and L-shaped positioning strips 46 are installed on the left and right sides of the upper side of the supporting plate 10 by bolts. The mounting plate 45 is installed on the supporting plate 10 between the two L-shaped positioning strips 46 by bolts, and the ventilation plate 32 is installed on the mounting plate 45 by bolts. The lower end of the No. 1 guide column 29 is installed on the mounting plate 45 by bolts. By arranging the L-shaped positioning strip 46 on the supporting plate 10, the mounting plate 45 can be positioned to improve the installation efficiency.

[0042] like Figure 7As shown, the gas path sealing unit is also provided with a lateral blocking unit, which is located on the mounting plate 45 at the rear side of the positioning seat 33 and is used to seal the side of the housing 1 and the side of the vacuum cover 22. Specifically, as Fig. 9 As shown, the lateral blocking unit includes a No. 1 mounting seat 47, a No. 2 mounting seat 48, a No. 3 driving member 49 and a No. 4 driving member 50. The No. 1 mounting seat 47 is mounted on the plate 45 by bolts, and the No. 3 driving member 49 is mounted on the left side of the No. 1 mounting seat 47 by bolts. The output shaft of the No. 3 driving member 49 passes through the left side of the No. 1 mounting seat 47, and an "I"-shaped push rod 51 is installed on its output shaft by bolts. The "I"-shaped push rod 51 is clamped on the left side of the No. 2 mounting block, and the No. 2 mounting seat 48 is set on the No. 1 mounting seat 47 in a sliding manner. The front and rear side surfaces of the No. 2 mounting seat 48 are both installed with sliders 52 by bolts, and the front and rear side surfaces of the inner side surface of the No. 1 mounting seat 47 are both installed with slide rails 53 by bolts. The slider 52 is slidably matched with the slide rail 53, and the No. 2 mounting seat 48 is driven to move by the No. 3 driving member 49. The fourth driving member 50 is installed inside the No. 2 mounting seat 48 by bolts, and the output shaft of the fourth driving member 50 passes through the right side of the No. 2 mounting seat 48, and a blocking rod 54 is installed on its output shaft by bolts, and a blocking sleeve is sleeved on the blocking rod 54, and the blocking sleeve includes a fixed section 55, a blocking section 56, a limiting section 57 and a connecting section 58 which are connected in sequence, and the fixed section 55, the blocking section 56, the limiting section 57 and the connecting section 58 are integrally formed, and the fixed section 55 is connected to the right side of the No. 2 mounting seat 48 by bolts, and a No. 5 sealing ring 59 is glued to the right side of the sealing section 56, and the No. 5 sealing ring 59 is used to seal the side of the vacuum cover 22. A No. 6 sealing ring 60 is sleeved on the blocking rod 54 between the connecting section 58 and the head of the blocking rod 54. The output shaft of the No. 4 driving member 50 contracts, which can drive the blocking rod 54 to move to the side away from the shell 1, so that the head of the blocking rod 54 moves to the inside of the No. 6 sealing ring 60, and the No. 6 sealing ring 60 is stretched open, so as to seal the connecting hole 3 on the shell 1.

[0043] like Fig.10 As shown, the wet detection unit is arranged below the sealing detection mechanism to detect the leakage position of the housing 1. Figure 3 As shown, a wet detection unit installation area is provided in the chassis 6 below the sealing detection mechanism, and a second switch door 61 is hinged on the chassis 6 on the front side of the wet detection unit to facilitate maintenance and repair of the leak detection unit.

[0044] like Fig.10As shown, the wet detection unit includes a No. 5 drive 62 and a water tank 63. The water tank 63 is a box structure with an opening at the top. The water tank 63 is vertically slidably arranged in the chassis 6. The No. 5 drive 62 can drive the water tank 63 to rise and fall. Specifically, a sliding plate 64 is welded at the bottom of the water tank 63. Four guide sleeves 65 are installed at the four corners of the top of the sliding plate 64 by bolts. The lower end of the No. 4 guide sleeve 65 passes through the bottom of the sliding plate 64 and is located below the sliding plate 64. Four slide bars 66 are installed on the chassis 6 below the sliding plate 64 by bolts. The upper end of each slide bar 66 passes through the No. 4 guide sleeve 65 and is welded to the chassis 6 above the sliding plate 64. The No. 5 drive 62 is installed on the chassis 6 below the sliding plate 64 by bolts. The output shaft of the No. 5 drive 62 is installed at the bottom of the sliding plate 64 by bolts. A sight glass 67 is installed on the front side of the water tank 63. The sight glass 67 is convenient for observing the leakage position of the housing 1. In this embodiment, the first driving member 12, the second driving member 23, the third driving member 49, the fourth driving member 50 and the fifth driving member 62 are all cylinders.

[0045] like Figure 3 A method for detecting a leak in an aluminum alloy housing is shown, comprising the following steps: S1: First, use the barcode scanner 68 to scan the barcode on the shell 1, and then place the shell 1 to be tested on the sealing detection mechanism; the positioning process of the shell 1 is: place the shell 1 on the ventilation plate 32, and use the positioning seat 33, the first positioning column 41 and the second positioning column 42 to accurately position the position of the shell 1; S2: Sealing the housing 1 and the vacuum cover 22 to ensure tightness; S2.1: Perform sealing operation on the upper and lower ends of the shell 1; specifically, after the shell 1 is placed in place, start the No. 1 driving member 12, the No. 1 driving member 12 drives the push plate 14 to slide downward along the support column 11, and then drives the blocking disk 19 to move synchronously, and the blocking disk 19 is tightly pressed on the top of the shell 1, and the top of the shell 1 is sealed by the No. 1 sealing ring, and the bottom of the shell 1 is sealed by the No. 3 sealing ring 35, so as to achieve effective sealing of the upper and lower ends of the shell 1; S2.2: Cover the vacuum cover 22 and seal the upper and lower ends of the vacuum cover 22; specifically, start the No. 2 driving member 23, the output shaft of the No. 2 driving member 23 contracts, driving the guide plate 28 to move downward along the No. 1 guide column 29, and then driving the vacuum cover 22 to move synchronously, and cover the vacuum cover 22 outside the shell 1. At this time, the top of the inner part of the vacuum cover 22 is tightly fitted with the top of the blocking disk 19, the top of the vacuum cover 22 is sealed by the No. 2 sealing ring 20, and the bottom of the vacuum cover 22 is sealed by the No. 4 sealing ring 36, ensuring the sealing of the upper and lower ends of the vacuum cover 22; S2.3: Perform a blocking operation on the side of the shell 1 and the vacuum cover 22; specifically, start the No. 3 driving member 49, the No. 3 driving member 49 drives the No. 2 mounting seat 48 to move toward the side close to the vacuum cover 22, and then drives the blocking sleeve and the blocking rod 54 to move synchronously, and seals the side of the vacuum cover 22 through the No. 5 sealing ring 59 on the blocking sleeve. At this time, the No. 6 sealing ring 60 and the blocking rod 54 are inserted into the connecting hole 3, and the No. 4 driving member 50 is started. The output shaft of the No. 4 driving member 50 contracts, driving the blocking rod 54 to move toward the side away from the shell 1, so that the head of the blocking rod 54 moves into the No. 6 sealing ring 60, and the No. 6 sealing ring 60 is opened to block the connecting hole 3 on the shell 1, thereby constructing an independent closed space inside the shell 1, and also forming a closed interval between the shell 1 and the vacuum cover 22; S3: evacuate the air in the vacuum cover 22 and fill the shell 1 with high-pressure gas; specifically, use a charging device to fill the shell 1 with high-pressure gas through the air inlet channel; at the same time, use a vacuum device to extract the gas in the vacuum cover 22 through the air extraction channel, thereby creating a negative pressure state in the vacuum cover 22; S4: After the inflation and degassing process is completed, the pressure change between the housing 1 and the vacuum cover 22 is monitored using a differential pressure sensor; S5: Determine whether the leakage of the housing 1 exceeds the standard based on the monitoring data, and the leakage of the housing 1 is ≤0.4cc / min; S6: If the leakage amount does not exceed the standard, the housing 1 is removed from the vent plate 32. The process of removing the housing 1 from the sealing detection mechanism is opposite to the process of installing the housing 1 on the sealing detection mechanism and performing the detection, which will not be repeated here; S7: If the leakage exceeds the standard, the wet detection unit is used to detect and determine the leakage location, and then the housing is removed from the sealing detection mechanism; S7.1: Remove the lateral blocking unit on the shell 1 and the vacuum cover 22. Specifically, start the No. 4 driving member 50, the output shaft of the No. 4 driving member 50 is extended, and the blocking rod 54 is driven to move toward the side close to the shell 1, so that the head of the blocking rod 54 extends out of the No. 6 sealing ring 60; then start the No. 3 driving member 49, the No. 3 driving member 49 drives the No. 2 mounting seat 48 to move toward the side away from the vacuum cover 22, so as to remove the blocking sleeve and the blocking rod 54; S7.2: Move the vacuum cover 22 away: Start the second drive member 23, the output shaft of the second drive member 23 extends, driving the guide plate 28 to move upward along the first guide column 29, thereby driving the vacuum cover 22 to move synchronously, so that the vacuum cover 22 is away from the housing 1; S7.3: Use the lateral blocking unit to block the connection hole 3 on the side of the shell 1: start the No. 3 driving member 49, the No. 3 driving member 49 drives the No. 2 mounting seat 48 to move toward the side close to the shell 1, thereby driving the blocking sleeve and the blocking rod 54 to move synchronously, the No. 6 sealing ring 60 and the blocking rod 54 are inserted into the connection hole 3, start the No. 4 driving member 50, the output shaft of the No. 4 driving member 50 contracts, driving the blocking rod 54 to move toward the side away from the shell 1, so that the head of the blocking rod 54 moves into the No. 6 sealing ring 60, the No. 6 sealing ring 60 is opened, and the connection hole 3 on the shell 1 is blocked, thereby constructing an independent closed space inside the shell 1; S7.4: Detect the leakage position of the shell 1: Start the No. 5 driving member 62, the output shaft of the No. 5 driving member 62 extends, driving the water tank 63 to rise synchronously, immerse the shell 1 in the water in the water tank 63, and observe the leakage position of the shell 1 through the sight glass 67.

[0046] Example 2 On the basis of embodiment 1, a control unit is further included, the control unit includes a controller and a buzzer, a pressure sensor is arranged in the fourth driving member 50, and the pressure sensor and the buzzer are both electrically connected to the controller. The controller uses a single chip microcomputer of model STC89C51, and the pressure sensor model is MPXV7002.

[0047] When the lateral blocking unit is used to block the connection hole 3 on the side of the vacuum cover 22 and the shell 1, the third drive 49 and the fourth drive 50 are started at the same time. The third drive 49 drives the second mounting seat 48 to move to the side close to the vacuum cover 22, thereby driving the blocking sleeve and the blocking rod 54 to move synchronously. At the same time, the output shaft of the fourth drive 50 is extended, driving the blocking rod 54 to move to the side close to the shell 1. When the actual position of the connection hole 3 deviates from the theoretical position, the head of the blocking rod 54 will touch the side wall of the connection hole 3. At this time, the pressure sensor located in the fourth drive 50 will immediately detect the pressure change and quickly feed back the pressure information to the controller. After receiving the pressure change information, the controller will immediately control the buzzer to send an alarm signal to clearly remind the operator that the position of the connection hole 3 has deviated, and then determine that the shell 1 is unqualified. When there is no deviation between the actual position of the connecting hole 3 and the theoretical position, the No. 5 sealing ring 59 on the sealing sleeve will seal the side of the vacuum cover 22, and the No. 6 sealing ring 60 and the sealing rod 54 will be inserted into the connecting hole 3. Through the contraction of the output shaft of the No. 4 driving member 50, the sealing rod 54 will be driven to move to the side away from the shell 1, so that the head of the sealing rod 54 will move into the No. 6 sealing ring 60, expand the No. 6 sealing ring 60, and seal the connecting hole 3 on the shell 1.

[0048] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for detecting leakage of an aluminum alloy shell, characterized in that: The following steps are involved: S1: Place the housing to be tested on the sealing testing mechanism; S2: Sealing operation is performed on the shell and the vacuum cover to ensure the sealing performance; S3: evacuate the air in the vacuum cover and fill the shell with high-pressure gas; S4: After the inflation and degassing process is completed, the differential pressure sensor is used to monitor the pressure change between the shell and the vacuum cover; S5: Determine whether the leakage of the shell exceeds the standard based on the monitoring data; S6: If the leakage does not exceed the standard, remove the housing from the sealing detection mechanism; S7: If the leakage exceeds the standard, the wet detection unit is used to detect the leakage position of the shell, and then the shell is removed from the sealing detection mechanism.

2. The aluminum alloy shell leak detection method according to claim 1, characterized in that: In S1 , before placing the shell to be inspected on the sealing inspection mechanism, a barcode on the shell is scanned by a scanner.

3. The aluminum alloy shell leak detection method according to claim 2, characterized in that: S2 includes the following steps: S2.1: perform sealing operation on the upper and lower ends of the shell; S2.2: Set up a vacuum cover and seal the upper and lower ends of the vacuum cover; S2.3: Seal the sides of the shell and the vacuum cover.

4. The aluminum alloy shell leak detection method according to claim 3, characterized in that: In S1, the sealing detection mechanism includes a bearing unit and an air path sealing unit, the air path sealing unit is arranged on the bearing unit, and the housing is placed on the air path sealing unit.

5. The aluminum alloy shell leak detection method according to claim 4, characterized in that: In S2.1, a top sealing unit slidably arranged on the bearing unit is used to seal the top of the shell, and an air path sealing unit is used to seal the bottom of the shell.

6. The aluminum alloy shell leak detection method according to claim 5, characterized in that: In S2.2, the vacuum hood is placed on the shell by using a lifting part slidably arranged on the top sealing unit, and the top of the vacuum hood is sealed by the top sealing unit, and the bottom of the vacuum hood is sealed by the air path sealing unit.

7. The aluminum alloy shell leak detection method according to claim 6, characterized in that: In S2.3, a lateral blocking unit is used to block the shell side and the vacuum cover side.

8. The aluminum alloy shell leak detection method according to claim 7, characterized in that: In S3, the air path sealing unit is provided with an air inlet channel communicating with the interior of the shell and an air exhaust channel communicating with the interior of the vacuum cover. The inflation device introduces high-pressure gas into the shell through the air inlet channel; the air exhaust device extracts the air in the vacuum cover through the air exhaust channel, so that a negative pressure state is formed in the vacuum cover.

9. The aluminum alloy shell leak detection method according to claim 8, characterized in that: In S5, the leakage of the housing is ≤0.4cc / min.

10. The aluminum alloy shell leak detection method according to claim 9, characterized in that: In S7, before using the wet method detection unit to detect the leakage position of the shell, first remove the lateral sealing units on the shell and the vacuum cover, then remove the vacuum cover, and then use the lateral sealing unit to seal the side of the shell, and then use the wet method detection unit to detect the leakage position of the shell.

Images