Generator shell pneumatic detection device and detection method

Abstract

The invention relates to the technical field of nondestructive testing, and discloses a pneumatic detection device and method for a generator shell. The pneumatic detection device for the generator shell comprises an air inlet device, a sealing device and a detection part, the gas inlet device provides detection gas; the sealing device comprises a contact piece and a fastening piece; the contact piece is attached to a to-be-detected area of the generator shell to form a closed detection cavity; the fastener compresses and fixes the contact member on the housing. The air inlet device is communicated with the detection cavity; the detection part detects the leakproofness of the detection cavity. The pneumatic detection method for the generator shell comprises the steps of cleaning a to-be-detected area; covering the to-be-detected area with the contact element, and pressing the contact element with the fastener to form a closed detection cavity; a gas inlet device is connected, the detection cavity is filled with gas, pressure judgment is carried out, and the to-be-detected area is smeared with a leakage indicating medium for bubble judgment; and confirming the sealing quality according to a judgment result. The technical problem that it is difficult to detect the maintenance position quickly after the generator shell is damaged and maintained in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and in particular to a pneumatic testing device and method for generator housing. Background Technology

[0002] The integrated engine generator (IDG) is a core component of the aircraft's power system, converting the mechanical energy provided by the engine into constant-frequency three-phase AC power to provide reliable and stable electricity for the entire aircraft. The generator housing is a magnesium alloy casting, primarily serving as the external protective and support structure for the generator. By forming a sealed space, the generator housing protects the internal precision components from external environmental factors (such as dust, moisture, and foreign objects) and prevents internal lubricating oil leakage. If the generator housing leaks lubricating oil due to localized defects, it could lead to abnormal pressure loss in the lubricating oil system, insufficient lubrication and cooling, and ultimately render the entire generator unusable. Furthermore, leaking lubricating oil could potentially trigger an uncontrollable fire in the electrical system.

[0003] The open end face of the generator casing, where various components connect, contains areas with thinner walls, making it prone to damage. After repair, it's necessary to verify its airtightness. However, verifying the overall airtightness of the generator casing is too cumbersome and difficult to quickly target the repaired area. Traditional X-ray and ultrasonic testing equipment is bulky and complex, making it impossible to quickly and conveniently inspect individual repair points on the repair site or assembly line, impacting repair efficiency. Furthermore, X-ray testing poses safety risks and is costly; fluorescent penetrant testing cannot verify internal through-hole defects. Existing technologies fail to provide a low-cost, readily apparent on-site solution. Summary of the Invention

[0004] This application discloses a pneumatic testing device and method for generator housing, in order to solve the technical problem in the related art that it is difficult to quickly detect the repair location after generator housing damage repair.

[0005] To solve the above problems, the present invention adopts the following technical solution: In a first aspect, this application discloses a generator housing pneumatic testing device, comprising: An air intake device is used to provide pressure-controlled detection gas; The sealing device includes a contact and a fastener; the contact fits against the area to be inspected on the generator housing, forming a sealed detection chamber between the contact and the area to be inspected; the fastener is used to press and fix the contact to the housing; the air intake device is connected to the detection chamber. The testing section is used to test the airtightness of the testing chamber.

[0006] Optionally, the detection unit includes a leak-indicating medium, which is applied to the other side of the area to be inspected to reveal a leak.

[0007] Optionally, the detection unit may also include a pressure monitoring unit, which is located in the air intake device, for monitoring the pressure inside the detection chamber.

[0008] Optionally, the air intake device includes an air source, an air intake pipe, and a connecting end; one end of the air intake pipe is connected to the air source, and the other end is connected to the connecting end; the connecting end is connected to a contact element, so that the air intake pipe communicates with the detection chamber; the air source provides stable and pressure-controllable gas; the air inlet is used to introduce gas into the detection chamber through the air intake pipe; The pressure monitoring unit is located in the intake pipe.

[0009] Optionally, the gas source is a portable air pump, and the output end of the portable air pump is equipped with a control valve; the gas output is controlled by the control valve.

[0010] Optionally, the contact element is a plate with a through-hole; one end of the detection hole is attached to the area to be inspected, and the other end is connected to the connection end.

[0011] Optionally, the contact element also includes an air inlet; the detection hole has a groove at one end near the area to be inspected; one end of the air inlet has a limiting ring, and the other end passes through the detection hole and connects to the connecting end; one side of the limiting ring abuts against the groove.

[0012] Optionally, the contact element also includes a sealing ring disposed in the groove; one side of the sealing ring abuts against the limiting ring, and the other side abuts against the area to be inspected.

[0013] Optionally, the fasteners include a vacuum suction cup and a fastening bolt; the vacuum suction cup is located on the side of the contact member closer to the housing; the side of the vacuum suction cup closer to the contact member has a fixing hole that mates with the fastening bolt; the contact member has a through hole; The vacuum suction cup is fixed to the housing; the fastening bolt passes through the through hole and is connected to the fixing hole, so that the contact element moves toward the vacuum suction cup and then the contact element abuts and is fixed to the area to be inspected. And / or, the fasteners include fastening bolts; the contact element has a through hole; the housing has a retaining hole that mates with the fastening bolt; The fastening bolt passes through the through hole and is connected to the fixing hole, so that the contact part moves toward the area to be inspected and abuts and is fixed to the area to be inspected.

[0014] Secondly, this application also discloses a generator housing aerodynamic testing method, applied to the generator housing aerodynamic testing device of the first aspect, comprising the following steps: Step S1: Clean the area to be inspected on the housing; Step S2: Align the contact with the area to be inspected and cover it with fasteners to form a sealed inspection chamber; Step S3: Connect the air intake device, fill the detection chamber with gas to the preset pressure and maintain the pressure; Step S4: During the pressure holding period, perform pressure determination and apply the leak indicator medium to the outer surface of the area to be inspected to determine air bubbles; Step S5: Based on the judgment result of step S4, confirm the sealing quality of the area to be inspected.

[0015] The technical solution adopted in this invention can achieve the following beneficial effects: 1. The present invention provides a pneumatic testing device and method for generator housings. By designing specialized contact parts and fasteners, an independent testing chamber can be quickly constructed in the area to be tested. This avoids the cumbersome process of sealing the entire housing, enables precise testing of specific repair points, greatly improves testing efficiency, and is particularly suitable for the workflow of repair stations; 2. The generator housing pneumatic detection device and detection method of the present invention combine pressure judgment and bubble judgment. The pressure monitoring unit can quickly determine whether there is a serious leak, while the leak detection medium (such as soapy water) can intuitively and accurately show the tiny leak points in the form of bubbles, realizing dual verification from whether there is a leak to where the leak is. The detection results are very reliable and intuitive. 3. The pneumatic testing device and method for generator housing of the present invention uses a portable air pump as the air source. The entire device does not require large and expensive equipment, resulting in low investment costs. The modular design makes it easy to assemble, disassemble, and carry, making it very suitable for use in maintenance workshops or field applications with limited resources. Furthermore, it provides multiple fastening methods (vacuum suction cups, fastening bolts) and sealing solutions, enabling the device to adapt to housings with different structural shapes and surface conditions. In particular, the vacuum suction cup solution provides a non-destructive and rapid fixing method for non-planar or non-drillable housing areas, ensuring the stability, reliability, and practicality of the installation and fixing. 4. The pneumatic testing device and method for generator housing of the present invention are highly safe and have no pollution risk: compared with X-ray testing, this method has no radiation risk; compared with fluorescent penetrant testing, this method has no risk of chemical reagent contamination of the workpiece; and it uses compressed air or inert gas as the testing medium, which is safe and environmentally friendly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the sealing device structure disclosed in some embodiments of this application; Figure 2 It is attached Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the overall drive generator structure of the IDG; Figure 4 It is attached Figure 3 Schematic diagram of the top of the generator.

[0018] In the diagram: 1-Contact, 101-Inspection hole, 2-Air inlet, 3-Fasting bolt, 4-Sealing ring, 5-Inspection area, 6-Fixing hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The core concept of this invention is to quickly construct an independent, sealed detection chamber in the inspection area 5 of the generator housing using a modular device, and to fill the chamber with pressurized gas, and finally to achieve detection by judging the sealing performance of the area.

[0022] The following is in conjunction with the appendix Figures 1 to 4 This application provides a detailed description of a generator housing aerodynamic testing device and testing method through specific embodiments and application scenarios.

[0023] like Figure 1 As shown, the generator housing pneumatic testing device of the present invention includes an air intake device, a sealing device, and a testing section; the sealing device includes a contact 1 and a fastener; the contact 1 is in contact with the area to be tested 5 of the generator housing, forming a sealed testing cavity between the contact 1 and the area to be tested 5. Fasteners are used to press and fix the contact 1 to the housing; the air inlet device is connected to the detection chamber and fills it with a stable and controllable pressure detection gas; The testing unit is used to test the airtightness of the testing chamber, including a pressure monitoring unit and a leak indicator medium. The pressure monitoring unit monitors whether the chamber pressure is stable in real time. At the same time, the operator applies the leak indicator medium to the side of the area to be tested 5 away from the contact 1 to show the leak. By observing whether the pressure measured by the pressure monitoring unit continues to drop, and observing whether continuous bubbles are generated at the application of the leak indicator medium, the operator can make a comprehensive judgment on whether there is a leak defect in the area to be tested 5.

[0024] Specifically, the air intake device is responsible for providing clean, dry, and pressure-controllable detection gas. The air intake device includes a gas source, an air intake pipeline, and a connecting end. The gas source provides the gas power for the detection of this device, preferably a portable air pump, which frees the entire detection device from dependence on fixed compressed air pipelines, greatly improving the device's mobility and field applicability, making it suitable for operation in maintenance workshops or field locations. To ensure pressure control, the output end of the portable air pump is equipped with a control valve. Preferably, the control valve integrates the functions of a pressure reducing valve and a switching valve, used to precisely regulate and stabilize the gas pressure output to the detection chamber. The air intake pipeline is preferably a high-pressure resistant flexible hose, with one end connected to the outlet of the portable air pump and the other end connected to the connecting end. The connecting end is preferably a quick-connect fitting, facilitating quick connection and disconnection between the air intake pipeline and the sealing device, simplifying the operation steps and improving detection efficiency. It should be noted that the air intake device is not shown in the figures; its structure uses existing technology and is not an improvement of this invention, and will not be described in detail here. Specifically, the detection unit is used to perform the final sealing judgment, which needs to be relatively simple and quick, and the detection effect needs to be accurate. The detection unit includes a pressure monitoring unit and a leak indicator medium. The pressure monitoring unit is preferably a digital pressure gauge, which is installed on the air inlet pipe to display the gas pressure value in the detection chamber in real time and accurately. During the pressure holding stage, if the pressure gauge reading shows a continuous and significant drop, it can be directly determined that there is a large leakage defect, without the need for subsequent steps, thus quickly determining the detection result. The leak indicator medium is preferably soapy water, which is evenly applied to the other side of the pressurized inspection area 5 with a brush. If there are microscopic cracks, pores, or other defects in this area that are difficult to detect with the naked eye, the leaked gas will form continuous and clear bubbles in the soapy water film, thereby accurately locating the defect. This method is extremely low in cost, intuitive in effect, and highly sensitive.

[0025] like Figure 2 As shown, in one embodiment, the sealing device is used to achieve localized precise detection and needs to cooperate with the generator housing to quickly form a reliable detection cavity; The sealing device includes a contact 1 and a fastener; the contact 1 serves as a mounting and mating base for connecting the air intake device and fitting with the area to be inspected 5; the contact 1 is preferably a plate with sufficient rigidity and strength and is not easily deformed; since the contact 1 needs to fit closely with the area to be inspected 5, it can be made separately as a special bearing plate to achieve a tighter fit between the contact 1 and the area to be inspected 5. A detection hole 101 is provided through the contact member 1. One end of the detection hole 101 is used to connect with the connection end of the air intake device, and the other end faces and covers the area to be inspected 5. Specifically, to achieve a reliable connection between the detection hole 101 and the air intake device, the contact member 1 also includes an air intake nozzle 2, which is preferably a pagoda connector for connecting with a quick-connect connector to ensure airtightness. A limiting ring is provided at one end of the pagoda connector, and the other end passes through the detection hole 101 to connect with the quick-connect connector. Since the pagoda connector needs to be limited, a groove is provided on the side of the detection hole 101 near the area to be inspected 5. After the pagoda connector passes through the detection hole 101, the limiting ring is embedded in the groove and abuts against the bottom of the groove, thereby limiting the further movement of the pagoda connector and fixing it on the contact member 1. Specifically, to achieve a seal between the detection hole 101 and the housing, the contact element 1 also includes a sealing ring 4, which is preferably an O-ring rubber seal. The sealing ring 4 is placed in the groove and located between the limiting ring and the surface of the area to be inspected 5 of the housing. When the pagoda connector passes through the detection hole 101 and the limiting ring abuts against the bottom of the groove, one side of the sealing ring 4 is in contact with the limiting ring, and the surface of the other side of the sealing ring 4 extends beyond the surface of the contact element 1 near the area to be inspected 5. When the contact element 1 is fastened to the housing, the sealing ring 4 is uniformly compressed, produces elastic deformation, and tightly fills the gap between the limiting ring and the housing, thereby ensuring the sealing of the detection cavity boundary.

[0026] The fasteners are used to provide sufficient clamping force to ensure a reliable seal and to withstand the reverse force generated by the detected air pressure; the present invention provides two preferred embodiments; Option 1: The fastener includes a vacuum suction cup and a fastening bolt 3; the vacuum suction cup is fixed to a smooth and flat position on the housing by its own vacuum generator (not shown in the figure, which can be manual or electric); the vacuum suction cup is provided with a fixing hole 6 with internal thread; a through hole is opened on the contact member 1 at the position corresponding to the fixing hole 6. Specifically, during installation, the fastening bolt 3 is passed through the through hole from above the contact 1 and screwed into the fixing hole 6 of the vacuum suction cup; when the bolt is tightened, the contact 1 is pulled towards the vacuum suction cup, so that the sealing ring 4 below it is tightly pressed against the area to be inspected 5 to form a seal; this solution does not require drilling holes in the housing, is a non-destructive clamping method, and has wide applicability. Option 2: The fastener is a fastening bolt 3. In this case, a fixing hole 6 is pre-drilled on the generator housing. In this embodiment, the generator housing originally has a threaded hole. A through hole is opened on the contact 1 at the position corresponding to the fixing hole 6. During installation, the fastening bolt 3 is passed through the through hole on the contact 1 and screwed directly into the fixing hole 6 of the housing. By tightening the bolt, the contact 1 can be directly pressed onto the area to be inspected 5. This option has the simplest structure, strong connection rigidity, and high reliability, and can be applied to areas to be inspected 5 where mounting holes are pre-set.

[0027] This application also discloses a method for aerodynamic testing of a generator housing, applied to a generator housing aerodynamic testing device, comprising the following steps: Step S1: Use a lint-free cloth dampened with anhydrous ethanol or acetone to thoroughly clean the oil, dust, rust and other impurities from the generator housing area 5 to be inspected and its surrounding surfaces; ensure that the surface of the area to be inspected (especially the repair welds) is clean and dry to ensure the reliability of the subsequent sealing and the accuracy of the bubble detection. Specifically, inspect each component of the testing device, confirming that the portable air pump has sufficient oil and power, that the pipeline connections are correct, and that there are no air leaks; confirm that the sealing ring 4 (O-ring) is intact and without permanent deformation, and that it is correctly installed in the groove of contact 1. Check that the fasteners (vacuum suction cup or fastening bolt 3) are functioning properly; confirm that the digital pressure gauge has sufficient power and that the reading returns to zero accurately. Prepare a rated soap solution and a soft brush. Step S2: Accurately align the contact part 1 (plate) of the sealing device with and completely cover the inspection area 5 to be inspected, and operate according to the selected fastener type; Specifically, if using a vacuum suction cup for fastening: first, press the vacuum suction cup onto a flat area of ​​the housing surface and apply a vacuum to fix it. Then, align the through hole on the contact 1 with the fixing hole 6 on the suction cup, insert the fastening bolt 3 and tighten it evenly, so that the contact 1 is pressed smoothly against the housing until the sealing ring 4 is evenly compressed, forming a preliminary seal; If using direct bolt fastening: Align the through hole on the contact 1 with the pre-made fixing hole 6 on the housing, directly insert the fastening bolt 3 and tighten it step by step, diagonally and evenly to ensure that the contact 1 is subjected to uniform force and press the sealing ring 4 tightly against the housing surface. At this point, the contact element 1, the sealing ring 4, and the area to be inspected on the generator housing 5 together form a sealed testing chamber; Step S3: Quickly connect the quick-connect fitting on the air intake pipe of the air intake device to the air intake nozzle 2 fixed on the contact 1, turn on the power of the portable air pump, and then slowly rotate the adjustment knob of the control valve (pressure reducing valve) to preset the output pressure to the specified value. It should be noted that the preset pressure needs to be determined according to the structural strength and safety standards of the area to be inspected 5 to avoid damage to thin-walled components due to excessive pressure; slowly open the switch valve of the control valve to start filling the test chamber with clean compressed air or nitrogen; the filling process should be smooth and slow to facilitate observation of the pressure rise and to allow the gas in the chamber to stabilize; Step S4: When the digital pressure gauge reading reaches the preset pressure value, quickly shut off the switch valve and air supply. The pressure holding phase begins at this point. Record the initial pressure value P1 and start timing; the pressure holding time is typically set to T minutes. During the pressure holding period, closely observe the changes in the digital pressure gauge reading. Specifically, if the pressure gauge reading shows a significant and sustained decrease, it indicates a macroscopic leak in the testing chamber. In this case, the sealing performance of the area under inspection (5) is immediately determined to be substandard, and no further microscopic assessment is required. Proceed directly to step six to depressurize. If the pressure gauge reading remains stable or the decrease is within the allowable error range throughout the entire pressure holding time, it indicates that there is no macroscopic leakage, and the macroscopic judgment is passed. After the pressure test is passed, under the pressure holding state, use a brush to evenly and completely apply soapy water to the outer surface and surrounding area of ​​the entire area to be inspected 5, forming a thin liquid film; under sufficient light, carefully observe the area covered with soapy water for at least 1 minute. Specifically, if continuously generated and gradually enlarging bubbles appear anywhere within the inspection area 5 or the contour of the sealing ring 4, it indicates the presence of a microscopic leakage defect (such as a microcrack or pinhole). The location and size of the defect should be recorded immediately. If no bubbles are generated on the surface of the inspected area during the entire observation period, or only a few isolated, no-growing microbubbles (usually attached gas) are found, then the sealing performance of the inspected area 5 is deemed to be qualified. Step S5: After the test is completed, the pressure must be released first; slowly open the pressure relief valve on the air intake device or contact 1 to safely and slowly release all the gas in the test chamber; after the pressure gauge confirms that the pressure in the chamber is zero, remove the fastening bolt 3 or release the vacuum suction cup to remove contact 1 from the generator housing; use a clean dry cloth to wipe off the soap water residue on the surface of the housing, and perform simple cleaning and maintenance on the device itself in preparation for the next use.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0029] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0030] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A pneumatic testing device for a generator housing, characterized in that, include: An air intake device is used to provide pressure-controlled detection gas; A sealing device includes a contact and a fastener; the contact is fitted to the area to be inspected on the generator housing, forming a sealed detection cavity between the contact and the area to be inspected; the fastener is used to press and fix the contact to the housing; the air intake device is connected to the detection cavity; The detection section is used to detect the airtightness of the detection chamber.

2. The generator housing pneumatic testing device according to claim 1, characterized in that, The detection unit includes a leak-indicating medium for application to the other side of the area to be inspected to reveal a leak.

3. The generator housing pneumatic testing device according to claim 2, characterized in that, The detection unit also includes a pressure monitoring unit, which is disposed in the air intake device and is used to monitor the pressure inside the detection chamber.

4. The generator housing pneumatic testing device according to claim 3, characterized in that, The air intake device includes an air source, an air intake pipe, and a connecting end; one end of the air intake pipe is connected to the air source, and the other end is connected to the connecting end; the connecting end is connected to the contact element, so that the air intake pipe communicates with the detection chamber; the air source provides stable and pressure-controllable gas; the air inlet is used to introduce gas into the detection chamber through the air intake pipe; The pressure monitoring unit is located in the air intake pipe.

5. The generator housing pneumatic testing device according to claim 4, characterized in that, The gas source is a portable air pump, and the output end of the portable air pump is equipped with a control valve; the gas output is controlled by the control valve.

6. The generator housing pneumatic testing device according to claim 5, characterized in that, The contact element is a plate with a through-hole; one end of the detection hole is attached to the area to be inspected, and the other end is connected to the connection end.

7. The generator housing pneumatic testing device according to claim 6, characterized in that, The contact element also includes an air inlet; the detection hole has a groove at one end near the area to be inspected; one end of the air inlet has a limiting ring, and the other end passes through the detection hole and is connected to the connecting end; one side of the limiting ring abuts against the groove.

8. The generator housing pneumatic testing device according to claim 7, characterized in that, The contact element also includes a sealing ring disposed in the groove; one side of the sealing ring abuts against the limiting ring, and the other side abuts against the area to be inspected.

9. A generator housing pneumatic testing device according to claim 8, characterized in that, The fastener includes a vacuum suction cup and a fastening bolt; the vacuum suction cup is located on the side of the contact member near the housing; the side of the vacuum suction cup near the contact member has a fixing hole that mates with the fastening bolt; the contact member has a through hole; The vacuum suction cup is fixed to the housing; the fastening bolt passes through the through hole and is connected to the fixing hole, so that the contact element moves toward the vacuum suction cup, and then the contact element abuts and is fixed to the area to be inspected; And / or, the fastener includes a fastening bolt; the contact element has a through hole; the housing has a fixing hole that mates with the fastening bolt; The fastening bolt passes through the through hole and is connected to the fixing hole, so that the contact element moves toward the area to be inspected and abuts against and is fixed to the area to be inspected.

10. A method for aerodynamic testing of a generator housing, based on the aerodynamic testing device for a generator housing according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Clean the area to be inspected on the housing; Step S2: Align the contact with and cover the area to be inspected, and tighten it with the fastener to form a sealed detection cavity; Step S3: Connect the air intake device, fill the detection chamber with gas to a preset pressure and maintain the pressure; Step S4: During the pressure holding period, pressure is determined, and a leak detection medium is applied to the outer surface of the area to be inspected to detect air bubbles; Step S5: Based on the judgment result of step S4, confirm the sealing quality of the area to be inspected.

Images