A plugging device and leak detection method

Abstract

This invention relates to the field of product leak detection technology, specifically a sealing device and leak detection method. The sealing device includes a drive assembly for mounting on a positioning plate, which holds the workpiece to be leak-tested; and a movable assembly detachably mounted on the positioning plate, with one end connected to the output end of the drive assembly and the other end extending outwards from the positioning plate and into the workpiece. The outer wall of the movable assembly is provided with a first sealing ring and a second sealing ring. The movable assembly also has a limiting protrusion, and the upper end of the positioning plate has a limiting groove. The limiting protrusion is engaged within the limiting groove, causing the first sealing ring to isolate the first and second oil passages of the workpiece, while the second sealing ring isolates the second oil passage and the inner cavity of the workpiece. This achieves precise sealing, requiring only one device to complete the leak detection operation of the inner cavity and dual oil passages, effectively reducing equipment costs and significantly improving the stability and reliability of the leak detection operation.

Description

Technical Field

[0001] This invention relates to the field of product leak detection technology, specifically to a sealing device and a leak detection method. Background Technology

[0002] In order to ensure product quality, during the production process of dual-motor housing products, strict leak detection operations must be carried out on the large cavity (internal space) and each lubrication oil passage. This leak detection process is performed using differential pressure airtightness detection technology, which aims to accurately identify and eliminate potential leak points.

[0003] like Figures 1 to 3 As shown, for the sealing test of the lubrication oil passages ⑥ and the large cavity ⑦ in the dual-motor housing product ②, the existing sealing structure ① generally adopts a double internal expansion (i.e., double sealing ring) structure. The top of the sealing structure ① is usually inserted into the internal space of the large cavity to achieve a better sealing effect. The above structure has high requirements for the precision control of the sealing position. Since the sealing structure ① is fixed to the mounting plate ③ with bolts, the bolt fixing method is not very precise, and it is difficult to ensure that the positions of the sealing rings ④ and ⑤ are always in the required position. It is impossible to separate the two lubrication oil passages ⑥ or to separate the lubrication oil passages ⑥ and the large cavity ⑦. The operator needs to manually adjust the position of the sealing rings ④ and ⑤ to avoid leakage problems caused by incomplete sealing. This process requires the operator to spend a long time making fine adjustments. Moreover, the smaller the spacing of the lubrication oil passages ⑥, the higher the precision requirement for the operator's adjustment work, and the greater the operation difficulty.

[0004] In response to the above situation, existing dual-motor housing products ② typically have a large gap between the bottom and the mounting plate ③ to facilitate operators' observation and adjustment of the sealing rings ④ and ⑤ located on top of the sealing structure ①. This means that the above structure cannot simultaneously seal the lubrication passage ⑥ and the large cavity ⑦. Therefore, two independent leak detection devices are often required to detect leaks in the lubrication passage ⑥ and the large cavity ⑦ respectively. While this effectively improves the flexibility and accuracy of leak detection operations, it inevitably increases equipment costs, prolongs the loading and unloading time of the dual-motor housing product ②, and has a certain impact on production efficiency. Summary of the Invention

[0005] The purpose of this invention is to propose a sealing device that addresses the problems of unreasonable sealing structure design in existing dual-motor housing products, which leads to difficulties in sealing alignment; and the technical issues of requiring two independent leak detection devices to detect leaks in the lubrication oil passage and the large cavity respectively.

[0006] To achieve the above objectives, the present invention proposes a sealing device, including a driving assembly for mounting on a positioning plate. The positioning plate is used to place and position the workpiece to be leaked. The positioning plate is provided with a through movable channel, and the output end of the driving assembly extends into the movable channel.

[0007] A movable component is detachably mounted on the positioning plate, with one end of the movable component extending into the movable channel and connected to the output end of the drive component, and the other end extending out to the outside of the positioning plate and into the workpiece to be leaked. The outer wall of the movable component is provided with a first sealing ring and a second sealing ring.

[0008] The movable component is also provided with a limiting protrusion. The upper end of the positioning plate is provided with a limiting groove corresponding to the limiting protrusion. The limiting protrusion is engaged in the limiting groove, so that the first sealing ring isolates the first oil passage and the second oil passage of the workpiece to be leaked, while the second sealing ring isolates the second oil passage and the inner cavity of the workpiece to be leaked.

[0009] Preferably, the movable component includes a movable rod and a guide sleeve, the guide sleeve being movably sleeved on the outer wall of the movable rod, the bottom end of the movable rod being connected to the output end of the drive component, and its top end extending outside the guide sleeve;

[0010] The lower end of the guide sleeve is provided with the limiting protrusion; there is an installation gap between the top end of the guide sleeve and the top end of the movable rod, the first sealing ring is provided in the installation gap, and the second sealing ring is provided on the outer wall of the guide sleeve.

[0011] Preferably, the guide sleeve includes a base, a first connecting section, and a second connecting section arranged sequentially from bottom to top, and the base is bolted to the positioning plate;

[0012] The outer diameter of the base is greater than the outer diameter of the first connecting section and the outer diameter of the second connecting section. The inner cavity includes a first cavity and a second cavity. The second connecting section is located in the second cavity. The first connecting section and the base are located in the first cavity. The workpiece to be leak-tested is also provided with an elongated portion. The upper surface of the second connecting section is provided with a second sealing ring. The second sealing ring abuts against the lower end of the elongated portion to isolate the first cavity and the second cavity.

[0013] Preferably, the lower end of the base is further provided with a third sealing ring, which abuts against the upper surface of the positioning plate to isolate the first cavity from the interior of the sealing device.

[0014] Preferably, the second connecting section has a limiting step inside, and the top of the movable rod has a sealing head, the outer diameter of the sealing head being greater than the outer diameter of the movable rod. The limiting step is used to limit the sealing head when it moves downward.

[0015] Preferably, a fourth sealing ring is provided on the limiting step, and the fourth sealing ring is used to abut against the lower end of the sealing head.

[0016] Preferably, the upper surface of the positioning plate is provided with a fifth sealing ring, which is used to abut against the lower surface of the edge of the workpiece to be inspected for leaks, so as to isolate the first cavity from the outside.

[0017] Preferably, the drive assembly includes a fixed plate and a drive component. The fixed plate is mounted on the lower end of the positioning plate, the drive component is detachably mounted on the fixed plate, and the output end of the drive component passes through the fixed plate and is connected to the movable rod.

[0018] Preferably, the driving component is a pneumatic cylinder or a hydraulic cylinder.

[0019] In addition, the present invention also proposes a leak detection method, comprising the following steps:

[0020] S1. Place the workpiece to be leaked on the positioning plate and make the fifth sealing ring press against the edge of the workpiece to be leaked, thereby isolating the first cavity from the outside.

[0021] S2. Use the sealing device as described above to isolate the first cavity from the second cavity;

[0022] S3. Use a leak detection device to simultaneously test the sealing performance of the first oil passage, the second oil passage, and the inner cavity.

[0023] The sealing device and leak detection method disclosed in this invention have the following beneficial effects: By providing a limiting protrusion on the movable component and a limiting groove on the positioning plate, the limiting protrusion of the movable component is inserted into the limiting groove during installation. This ensures that the position of the first sealing ring on the movable component can precisely isolate the first oil passage and the second oil passage, while the position of the second sealing ring can precisely isolate the second oil passage and the inner cavity, thus achieving precise sealing of the inner cavity and the two oil passages (i.e., the first oil passage and the second oil passage). In addition, the original requirement of using two devices to detect leaks in the inner cavity and the oil passages separately and sequentially is reduced to only one device to complete the leak detection operation of the inner cavity and the two oil passages. This not only effectively reduces equipment costs but also significantly improves the stability and reliability of the leak detection operation. Attached Figure Description

[0024] 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 the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a traditional sealing structure and the workpiece to be inspected for leaks;

[0026] Figure 2 This is a schematic diagram of a traditional sealing structure;

[0027] Figure 3 A simplified schematic diagram of the traditional sealing structure and the cross-sectional structure of the workpiece to be leaked;

[0028] Figure 4 This is a schematic diagram of the sealing device and the workpiece to be inspected according to the present invention;

[0029] Figure 5 This is a cross-sectional structural diagram of the sealing device and the workpiece to be leaked according to the present invention;

[0030] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0031] Figure 7 This is a simplified cross-sectional structural diagram of the sealing device and the workpiece to be leaked according to the present invention.

[0032] Figure 8 This is a schematic diagram of the sealing device of the present invention.

[0033] In the attached diagram: 1-Drive assembly, 11-Fixed plate, 12-Drive component, 2-Positioning plate, 21-Moving channel, 22-Limiting groove, 23-Fifth sealing ring, 3-Workpiece to be leak-tested, 31-First oil passage, 32-Second oil passage, 33-Inner cavity, 331-First cavity, 332-Second cavity, 34-Extension, 4-Moving assembly, 41-Limiting protrusion, 42-Moving rod, 421-Sealing head, 43-Guide sleeve, 431-Base, 4311-Third sealing ring, 432-First connecting section, 433-Second connecting section, 4331-Limiting step, 4332-Fourth sealing ring, 5-First sealing ring, 6-Second sealing ring.

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] like Figures 4 to 8 As shown, a sealing device includes:

[0039] A drive assembly 1 is mounted on a positioning plate 2, which is used to place and position the workpiece 3 to be inspected for leaks. The positioning plate 2 is provided with a through movable channel 21, and the output end of the drive assembly 1 extends into the movable channel 21.

[0040] The movable component 4 is detachably mounted on the positioning plate 2. One end of the movable component 4 extends into the movable channel 21 and is connected to the output end of the drive component 12. The other end extends out to the outside of the positioning plate 2 and into the workpiece 3 to be leaked. The outer wall of the movable component 4 is provided with a first sealing ring 5 and a second sealing ring 6.

[0041] The movable component 4 is also provided with a limiting protrusion 41. The upper end of the positioning plate 2 is provided with a limiting groove 22 corresponding to the limiting protrusion 41. The limiting protrusion 41 is engaged in the limiting groove 22, so that the first sealing ring 5 isolates the first oil passage 31 and the second oil passage 32 of the workpiece 3 to be leaked, while the second sealing ring 6 isolates the second oil passage 32 and the inner cavity 33 of the workpiece 3 to be leaked.

[0042] The sealing device in this solution is particularly suitable for sealing during leak detection of dual-motor housing products. Of course, in other embodiments, it can also be used for sealing other workpieces 3 to be leak-tested.

[0043] In this scheme, the workpiece 3 to be inspected for leaks is first placed on the positioning plate 2. The positioning plate 2 is provided with several positioning columns to support the workpiece 3 to be inspected for leaks, ensuring that it is stably placed on the positioning plate 2. That is, there is no gap between the positioning plate 2 and the workpiece 3 to be inspected for leaks, and the two are tightly fitted. Then, the driving component 1 drives the movable component 4 to move up and down along the movable channel 21 to achieve sealing of various parts of the workpiece 3 to be inspected for leaks.

[0044] To address the issue of inaccurate alignment of the sealing rings in traditional sealing structures where the mounting plate and base plate are bolted together, this design incorporates a limiting protrusion 41 on the movable component 4 and a limiting groove 22 on the positioning plate 2. During installation, the limiting protrusion 41 of the movable component 4 is inserted into the limiting groove 22, ensuring that the first sealing ring 5 on the movable component 4 is positioned to precisely isolate the first oil passage 31 and the second oil passage 32. Simultaneously, the second sealing ring 6 is positioned to precisely isolate the second oil passage 32 from the inner cavity 33. Therefore, when leak testing the workpiece 3, operators do not need to frequently adjust the height of the sealing device to ensure precise alignment of the sealing rings; simply installing the limiting protrusion 41 into the limiting groove 22 achieves a simple yet precise seal.

[0045] Furthermore, the movable component 4 includes a movable rod 42 and a guide sleeve 43. The guide sleeve 43 is movably sleeved on the outer wall of the movable rod 42. The bottom end of the movable rod 42 is connected to the output end of the drive component 1, and its top end extends to the outside of the guide sleeve 43.

[0046] The lower end of the guide sleeve 43 is provided with the limiting protrusion 41; there is an installation gap 44 between the top end of the guide sleeve 43 and the top end of the movable rod 42, the first sealing ring 5 is provided in the installation gap 44, and the second sealing ring 6 is provided on the outer wall of the guide sleeve 43.

[0047] The movable component 4 mainly consists of a movable rod 42 and a guide sleeve 43. The movable rod 42 can move up and down within the guide sleeve 43 to block or open various channels of the workpiece 3 to be inspected for leaks. The up and down movement of the movable rod 42 is driven by the drive component 1. The movable rod 42 extends outside the guide sleeve 43, and the part of the movable rod 42 extending outside the guide sleeve 43 has an installation gap 44 with the top end of the guide sleeve 43. The first sealing ring 5 is located exactly within this installation gap 44, which can isolate the first oil passage 31 and the second oil passage 32. The second sealing ring 6 is installed on the guide sleeve 43.

[0048] Furthermore, the guide sleeve 43 includes a base 431, a first connecting section 432 and a second connecting section 433 arranged sequentially from bottom to top, and the base 431 is bolted to the positioning plate 2;

[0049] The outer diameter of the base 431 is greater than the outer diameter of the first connecting section 432, which is greater than the outer diameter of the second connecting section 433. The inner cavity 33 includes a first cavity 331 and a second cavity 332. The second connecting section 433 is located inside the second cavity 332. The first connecting section 432 and the base 431 are located inside the first cavity 331. The workpiece 3 to be leak-tested is also provided with an elongated portion 34. The upper surface of the second connecting section 433 is provided with a second sealing ring 6. The second sealing ring 6 abuts against the lower end of the elongated portion 34 to isolate the first cavity 331 and the second cavity 332.

[0050] The guide sleeve 43 includes a base 431 with a gradually decreasing diameter, a first connecting section 432 and a second connecting section 433. The base 431 is detachably mounted on the positioning plate 2 by bolts. The first sealing ring 5 is disposed in the installation gap 44 between the second connecting section 433 and the protruding part of the movable rod 42.

[0051] In the existing sealing structure, the first sealing ring 5 and the second sealing ring 6 are both set on the vertical outer wall of the guide sleeve 43. However, due to the different sealing positions of the two, the extrusion and friction forces they bear are different, and their materials and hardening are slightly different. This will cause the two sealing rings to wear unevenly after a long period of use. Usually, the second sealing ring 6 wears more, which will cause the sealing structure to fail to seal the workpiece 3 to be leaked properly.

[0052] Therefore, as Figures 6 to 8 As shown, the position of the second sealing ring 6 in this embodiment has also been adjusted. The position of the second sealing ring 6 is adjusted to be set on the horizontal upper surface of the second connecting section 433. In this way, the second sealing ring 6 is no longer subject to long-term wear of the inner wall of the workpiece 3 to be leaked. During sealing, the second sealing ring 6 is mainly pressed against the elongated part 34 of the workpiece 3 to be leaked. The second sealing ring 6 is only subjected to the pressing force, and it has a good sealing effect even after long-term use.

[0053] Furthermore, the lower end of the base 431 is provided with a third sealing ring 4311, which abuts against the upper surface of the positioning plate 2 to isolate the first cavity 331 from the interior of the sealing device.

[0054] In order to further improve the sealing effect of the workpiece 3 to be leaked, a third sealing ring 4311 is added to the lower end of the base 431 in this embodiment. Since the base 431 is bolted to the positioning plate 2, there may be a slight gap between them, which may lead to air leakage. After setting the third sealing ring 4311, the leak detection gas can be prevented from entering the sealing device from the lower end of the base 431.

[0055] Furthermore, the second connecting section 433 is provided with a limiting step 4331 inside, and the top of the movable rod 42 is a sealing head 421. The outer diameter of the sealing head 421 is greater than the outer diameter of the movable rod 42. The limiting step 4331 is used to limit the sealing head 421 when it moves down.

[0056] In this design, the movement distance of the movable rod 42 is limited. The movement of the movable rod 42 is limited by the limiting step 4331 inside the guide sleeve 43. Since the diameter of the sealing head 421 is large, it can just abut against the limit step 4331 when it moves down, preventing the movable rod 42 from moving down too much and ensuring the normal use of the sealing device. When the sealing head 421 moves up, it just abuts against the top of the second cavity 332 of the workpiece 3 to be leaked.

[0057] Furthermore, a fourth sealing ring 4332 is provided on the limiting step 4331, and the fourth sealing ring 4332 is used to abut against the lower end of the sealing head 421.

[0058] Similarly, in order to further improve the sealing effect on the leak-detected workpiece 3, this embodiment also provides a fourth sealing ring 4332 inside the sealing device. The fourth sealing ring 4332 is located on the upper surface of the limiting step 4331 to further prevent leak detection gas from entering the interior of the sealing device.

[0059] Furthermore, the upper surface of the positioning plate 2 is provided with a fifth sealing ring 23, which is used to abut against the lower surface of the edge of the workpiece 3 to be inspected for leaks, so as to isolate the first cavity 331 from the outside.

[0060] The fifth sealing ring 23 is provided to keep the inner cavity 33 of the workpiece 3 to be leak-tested in a sealed state. When the workpiece 3 to be leak-tested is placed on the positioning plate 2, the lower surface of its edge is tightly fitted with the fifth sealing ring 23 on the positioning plate 2, so that the inner cavity 33 of the workpiece 3 to be leak-tested is isolated from the outside. Since the second sealing ring 6 is provided, the first cavity 331 and the second cavity 332 in the inner cavity 33 are isolated by the second sealing ring 6, thereby realizing the isolation between the oil passage and the inner cavity 33.

[0061] In this design, the first sealing ring 5 to the fifth sealing ring 23 can all be made of rubber, which has the characteristics of corrosion resistance and compression deformation resistance, ensuring that the sealing device of this design has a long service life.

[0062] Furthermore, the drive assembly 1 includes a fixed plate 11 and a drive member 12. The fixed plate 11 is installed at the lower end of the positioning plate 2, and the drive member 12 is detachably mounted on the fixed plate 11. The output end of the drive member 12 passes through the fixed plate 11 and is connected to the movable rod 42.

[0063] The drive component 12 is detachably mounted below the positioning plate 2 via the fixing plate 11, facilitating the maintenance and replacement of the drive component 12. The output end of the drive component 12 extends into the movable channel 21, and the drive component 12 drives the movement of the movable rod 42 to seal each channel of the workpiece 3 to be inspected for leaks.

[0064] Furthermore, the driving component 12 is a pneumatic cylinder or a hydraulic cylinder. In this embodiment, using a pneumatic cylinder or a hydraulic cylinder as the power source to drive the movable rod 42 up and down has the advantages of simple structure, low cost, and easy installation and maintenance. In addition, the pneumatic cylinder also has the characteristics of smooth movement and fast response speed, which can accurately control the movement distance of the movable rod 42 and ensure that the sealing device completes the sealing of each channel of the workpiece 3 to be inspected for leaks. The hydraulic cylinder can be a hydraulic cylinder, which can withstand greater working pressure and has a longer service life.

[0065] In particular, the present invention also proposes a leak detection method, including the following steps: S1. Place the workpiece 3 to be leaked on the positioning plate 2, and make the fifth sealing ring 23 press against the edge of the workpiece 3 to be leaked, thereby isolating the first cavity 331 from the outside.

[0066] S2. Use the above-mentioned sealing device to isolate the first cavity 331 from the second cavity 332;

[0067] S3. Use a leak detection device to simultaneously test the sealing performance of the first oil passage 31, the second oil passage 32, and the inner cavity 33.

[0068] This leak detection method is applicable to the aforementioned sealing device, and therefore has the same beneficial effects as the sealing device. The sealing device optimizes the overall structure, achieving precise sealing of the inner cavity 33 and the double oil passage positions of the workpiece 3 to be leak-tested while ensuring leak detection stability. Simultaneously, it reduces the need for two separate and sequential leak detection devices for the inner cavity 33 and the oil passages to a single device, effectively lowering equipment costs and significantly improving the stability and reliability of the leak detection operation.

[0069] If necessary, other sealing devices can be used in conjunction with the plugging device of this solution to seal the remaining holes / channels of the workpiece to be leak-tested.

[0070] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An occlusion device, comprising: The utility model relates to a drive assembly and activity assembly for detecting leakage of workpiece, which comprises the following steps: A drive assembly (1) is arranged on a positioning plate (2) for placing and positioning a workpiece (3) to be detected, and the output end of the drive assembly (1) extends into a through activity channel (21) of the positioning plate (2); The drive assembly (1) comprises a fixed plate (11) and a drive member (12), the fixed plate (11) is arranged at the lower end of the positioning plate (2), the drive member (12) is detachably arranged on the fixed plate (11), and the output end of the drive member (12) is connected with an activity rod (42) through the fixed plate (11); An activity assembly (4) is detachably arranged on the positioning plate (2), one end of the activity assembly (4) extends into the activity channel (21) and is connected with the output end of the drive member (12), the other end of the activity assembly (4) extends out of the positioning plate (2) and extends into the workpiece (3) to be detected, and the outer wall of the activity assembly (4) is provided with a first sealing ring (5) and a second sealing ring (6); The activity assembly (4) is further provided with a limiting protruding part (41), the upper end of the positioning plate (2) is provided with a limiting groove (22) corresponding to the limiting protruding part (41), the limiting protruding part (41) is clamped in the limiting groove (22), the first sealing ring (5) is isolated from a first oil passage (31) and a second oil passage (32) of the workpiece (3) to be detected, and the second sealing ring (6) is isolated from the second oil passage (32) and an inner cavity (33) of the workpiece (3) to be detected; The activity assembly (4) comprises an activity rod (42) and a guide sleeve (43), the guide sleeve (43) is movably sleeved on the outer wall of the activity rod (42), the bottom end of the activity rod (42) is connected with the output end of the drive assembly (1), and the top end of the activity rod (42) extends out of the guide sleeve (43); the lower end of the guide sleeve (43) is provided with the limiting protruding part (41); the top end of the guide sleeve (43) is provided with the first sealing ring (5) in the mounting gap (44) between the top end of the activity rod (42) and the top end of the guide sleeve (43), and the outer wall of the guide sleeve (43) is provided with the second sealing ring (6). The guide sleeve (43) comprises a base (431), a first connecting section (432) and a second connecting section (433) arranged in sequence from bottom to top, the base (431) is bolted with the positioning plate (2); the outer diameter of the base (431) > the outer diameter of the first connecting section (432) > the outer diameter of the second connecting section (433), the inner cavity (33) comprises a first cavity (331) and a second cavity (332), the second connecting section (433) is located in the second cavity (332), the first connecting section (432) and the base (431) are located in the first cavity (331), the workpiece to be detected (3) is also provided with an elongated part (34), the upper surface of the second connecting section (433) is provided with the second sealing ring (6), the second sealing ring (6) is tightly abutted with the lower end of the elongated part (34), so as to isolate the first cavity (331) and the second cavity (332).

2. The occlusion device of claim 1, wherein, The lower end of the base (431) is also provided with a third sealing ring (4311), the third sealing ring (4311) is tightly abutted with the upper surface of the positioning plate (2), so as to isolate the first cavity (331) from the inside of the plugging device.

3. The occlusive device of claim 1, wherein, The inside of the second connecting section (433) is provided with a limiting step (4331), the top of the movable rod (42) is a plugging head (421), the outer diameter of the plugging head (421) > the outer diameter of the movable rod (42), the limiting step (4331) is used for limiting the plugging head (421) when it moves downward.

4. The occlusive device of claim 3, wherein the first and second portions are configured to be coupled together by a coupling mechanism. The limiting step (4331) is provided with a fourth sealing ring (4332), the fourth sealing ring (4332) is used for tightly abutting with the lower end of the plugging head (421).

5. The occlusive device of claim 1, wherein, The upper surface of the positioning plate (2) is provided with a fifth sealing ring (23), the fifth sealing ring (23) is used for tightly abutting with the lower surface of the edge of the workpiece to be detected (3), so as to isolate the first cavity (331) from the outside.

6. The occlusive device of claim 5, wherein the first and second portions are configured to be connected by a hinge. The driving member (12) is a pneumatic cylinder or an oil cylinder.

7. A leak detection method characterized by, The method comprises the following steps: S1. placing the workpiece to be detected (3) on the positioning plate (2), and tightly abutting the fifth sealing ring (23) with the edge of the workpiece to be detected (3), so as to isolate the first cavity (331) from the outside; S2. using the plugging device as claimed in claim 5 to isolate the first cavity (331) from the second cavity (332); S3. using a leak detection device to detect the sealing performance of the first oil channel (31), the second oil channel (32) and the inner cavity (33) at the same time.

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