Plugging device and leak detection method

Abstract

The invention relates to the technical field of product leakage detection, in particular to a plugging device and a leakage detection method. The plugging device comprises a driving assembly which is used for being installed on a positioning plate, and the positioning plate is used for placing a workpiece to be detected. The movable assembly is detachably arranged on the positioning plate, one end of the movable assembly is connected with the output end of the driving part, the other end of the movable assembly extends to the outer side of the positioning plate and extends into the workpiece to be subjected to leak detection, and a first sealing ring and a second sealing ring are arranged on the outer wall of the movable assembly; the movable assembly is further provided with a limiting protruding part, the upper end of the positioning plate is provided with a limiting groove, and the limiting protruding part is clamped in the limiting groove, so that the first sealing ring isolates the first oil channel and the second oil channel of the workpiece to be detected, and meanwhile the second sealing ring isolates the second oil channel and the inner cavity of the workpiece to be detected. According to the utility model, accurate sealing is realized, leakage detection operation of the inner cavity and the double oil ducts can be completed by only one device, the device cost is effectively reduced, and the stability and the reliability of leakage detection operation are obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of product leakage detection, in particular to a plugging device and a leakage detection method. Background Art

[0002] In the production process of dual-motor housing products, in order to ensure product quality, strict leak detection operations must be carried out on the large cavity (internal space) and each lubrication oil channel. This leak detection process uses differential pressure air tightness detection technology to accurately identify and eliminate potential leaks.

[0003] like Figures 1 to 3 As shown, for the sealing test of the lubricating oil passage ⑥ and the large cavity ⑦ in the dual motor housing product ②, the existing plugging structure ① generally adopts a double inner expansion (i.e. double sealing ring) structure, and the top of the plugging 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 plugging structure ① is fixed to the mounting plate ③ by bolts, the bolt fixing method is not accurate, and it is difficult to ensure that the positions of the sealing rings ④ and ⑤ are always in the required positions. It is impossible to separate the two lubricating oil passages ⑥ or the lubricating oil passage ⑥ and the large cavity ⑦. The operator needs to manually adjust the positions of the sealing rings ④ and ⑤ to avoid leakage problems caused by imperfect sealing. This process requires the operator to spend a long time for fine adjustment. And the smaller the spacing of the lubricating oil passages ⑥, the higher the precision requirements for the operator's debugging work, and the greater the difficulty of operation.

[0004] In view of the above situation, a large distance is usually set between the bottom of the existing dual motor housing product ② and the mounting plate ③, so that the operator can observe and adjust the sealing rings ④ and ⑤ located at the top of the blocking structure ①. That is, the above structure cannot achieve the simultaneous sealing of the lubricating oil channel ⑥ and the large cavity ⑦. Therefore, two independent leak detection devices are often required to detect leaks in the lubricating oil channel ⑥ and the large cavity ⑦ respectively. Although the flexibility and accuracy of the leak detection operation are effectively improved, it inevitably increases the equipment cost, 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 the present invention is to propose a sealing device, aiming to solve the technical problems that the sealing structure design of the existing dual-motor box products is unreasonable, resulting in difficulty in sealing alignment; and two independent leak detection devices are required to respectively detect leaks in the lubricating oil channel and the large cavity.

[0006] To achieve the above-mentioned purpose, the present invention provides a plugging device, comprising a driving assembly, which is used to be installed on a positioning plate, the positioning plate is used to place and position the workpiece to be leak-checked, the positioning plate is provided with a through active channel, and the output end of the driving assembly extends into the active channel;

[0007] A movable component is detachably arranged on the positioning plate, and one end of the movable component extends into the movable channel and is connected to the output end of the driving member, and the other end extends to the outside of the positioning plate and extends into the workpiece to be leak-checked, and 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, and the upper end of the positioning plate is provided with a limiting groove corresponding to the limiting protrusion. The limiting protrusion is clamped in the limiting groove, so that the first sealing ring isolates the first oil channel and the second oil channel of the workpiece to be tested for leakage, and at the same time, the second sealing ring isolates the second oil channel and the inner cavity of the workpiece to be tested for leakage.

[0009] Preferably, the movable assembly comprises a movable rod and a guide sleeve, the guide sleeve is movably sleeved on the outer wall of the movable rod, the bottom end of the movable rod is connected to the output end of the driving assembly, and the top end thereof extends out of the guide sleeve;

[0010] The lower end of the guide sleeve is provided with the limiting protrusion; an installation gap is provided 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 outer wall of the guide sleeve is provided with the second sealing ring.

[0011] Preferably, the guide sleeve comprises a base, a first connecting section and a second connecting section arranged in sequence 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 greater than 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-checked is also provided with an extension portion. The upper surface of the second connecting section is provided with the second sealing ring, and the second sealing ring is tightly pressed against the lower end of the extension portion to isolate the first cavity from the second cavity.

[0013] Preferably, a third sealing ring is further provided at the lower end of the base, and the third sealing ring is pressed tightly against the upper surface of the positioning plate to isolate the first cavity from the interior of the blocking device.

[0014] Preferably, a limiting step is provided inside the second connecting section, a plugging head is provided on the top of the movable rod, the outer diameter of the plugging head is greater than the outer diameter of the movable rod, and the limiting step is used to limit the plugging 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 press tightly against the lower end of the sealing head.

[0016] Preferably, a fifth sealing ring is provided on the upper surface of the positioning plate, and the fifth sealing ring is used to press against the lower surface of the edge of the workpiece to be leak-tested to isolate the first cavity from the outside.

[0017] Preferably, the driving assembly includes a fixing plate and a driving member, the fixing plate is mounted on the lower end of the positioning plate, the driving member is detachably arranged on the fixing plate, and the output end of the driving member passes through the fixing plate and is connected to the movable rod.

[0018] Preferably, the driving member is a pneumatic cylinder or an oil cylinder.

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

[0020] S1. placing the workpiece to be leak-checked on the positioning plate, and placing the fifth sealing ring against the edge of the workpiece to be leak-checked, thereby isolating the first cavity from the outside;

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

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

[0023] The plugging device and leak detection method disclosed in the present 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, so as to ensure that the position of the first sealing ring on the movable component can just isolate the first oil channel and the second oil channel, and at the same time, the position of the second sealing ring can just isolate the second oil channel from the inner cavity, thereby achieving precise sealing of the inner cavity and the double oil channels (i.e., the first oil channel and the second oil channel); in addition, the situation in which two devices were originally required to perform leak detection on the inner cavity and the oil channel separately and successively is reduced to only one device being required to complete the leak detection operation of the inner cavity and the double oil channels, which not only effectively reduces the equipment cost, but also significantly improves the stability and reliability of the leak detection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the traditional plugging structure and the workpiece to be leak-checked;

[0026] Figure 2 It is a structural schematic diagram of a traditional plugging structure;

[0027] Figure 3 It is a simplified schematic diagram of the cross-sectional structure of the traditional plugging structure and the workpiece to be leak-checked;

[0028] Figure 4 It is a schematic diagram of the structure of the plugging device of the present invention and the workpiece to be leak-checked;

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the plugging device of the present invention and the workpiece to be leak-checked;

[0030] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0031] Figure 7 It is a schematic diagram of the cross-sectional structure of a simplified plugging device and a workpiece to be leak-checked according to the present invention;

[0032] Figure 8 It is a schematic structural diagram of the blocking device of the present invention.

[0033] In the accompanying drawings: 1-driving assembly, 11-fixed plate, 12-driving member, 2-positioning plate, 21-movable channel, 22-limiting groove, 23-fifth sealing ring, 3-workpiece to be leak-checked, 31-first oil channel, 32-second oil channel, 33-inner cavity, 331-first cavity, 332-second cavity, 34-extension portion, 4-movable assembly, 41-limiting protrusion, 42-movable 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 purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if a directional indication is involved in the embodiment of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] like Figures 4 to 8 As shown, a blocking device comprises:

[0039] A driving assembly 1 is used to be installed on a positioning plate 2, the positioning plate 2 is used to place and position a workpiece 3 to be leak-checked, the positioning plate 2 is provided with a through active channel 21, and the output end of the driving assembly 1 extends into the active channel 21;

[0040] A movable component 4 is detachably arranged on the positioning plate 2, and one end of the movable component 4 extends into the movable channel 21 and is connected to the output end of the driving member 12, and the other end extends to the outside of the positioning plate 2 and extends into the workpiece 3 to be leak-checked, and 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, and 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 clamped in the limiting groove 22, so that the first sealing ring 5 isolates the first oil channel 31 and the second oil channel 32 of the workpiece to be tested for leakage 3, and at the same time, the second sealing ring 6 isolates the second oil channel 32 and the inner cavity 33 of the workpiece to be tested for leakage 3.

[0042] The blocking device in this solution is particularly suitable for blocking a dual-motor housing product during a leak detection process. Of course, in other embodiments, it can also be used for blocking other workpieces 3 to be leak-detected.

[0043] In this solution, the workpiece 3 to be inspected for leaks is first placed on the positioning plate 2. A number of positioning columns are provided on the positioning plate 2 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 distance 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 blocking of various locations of the workpiece 3 to be inspected for leaks.

[0044] In order to improve the problem of low accuracy of the sealing ring alignment in the traditional plugging structure caused by bolts used to fix the mounting plate and the bottom plate of the plugging structure. In this solution, a limiting protrusion 41 is provided on the movable component 4, and a limiting groove 22 is provided on the positioning plate 2. During installation, the limiting protrusion 41 of the movable component 4 is inserted into the limiting groove 22, which can ensure that the position of the first sealing ring 5 on the movable component 4 can just isolate the first oil channel 31 from the second oil channel 32. At the same time, the position of the second sealing ring 6 can just isolate the second oil channel 32 from the inner cavity 33. Therefore, when it is necessary to detect leaks on the workpiece 3 to be inspected for leaks, the operator does not need to frequently adjust the height of the plugging device to accurately align the sealing ring. It is only necessary to install the limiting protrusion 41 in the limiting groove 22. The structure is simple and accurate sealing is achieved.

[0045] Furthermore, the movable assembly 4 includes a movable rod 42 and a guide sleeve 43, wherein 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 driving assembly 1, and the top end thereof extends out of the guide sleeve 43;

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

[0047] The movable assembly 4 is mainly composed of a movable rod 42 and a guide sleeve 43. The movable rod 42 can move up and down in the guide sleeve 43 to block or open various channels of the workpiece 3 to be leak-checked. The up and down movement of the movable rod 42 is driven by the driving assembly 1. The movable rod 42 extends out of the guide sleeve 43. There is an installation gap 44 between the portion of the movable rod 42 extending out of the guide sleeve 43 and the top of the guide sleeve 43. The first sealing ring 5 is just located in the installation gap 44, which can just isolate the first oil passage 31 from the second oil passage 32, and 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 in sequence 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 and 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 in the second cavity 332. The first connecting section 432 and the base 431 are located in the first cavity 331. The workpiece 3 to be leak-checked is also provided with an extension portion 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 pressed against the lower end of the extension portion 34 to isolate the first cavity 331 from 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 arranged in the installation gap 44 between the second connecting section 433 and the protruding part of the movable rod 42.

[0051] The first sealing ring 5 and the second sealing ring 6 of the sealing structure in the prior art are both arranged on the vertical outer wall of the guide sleeve 43. However, due to the different sealing positions of the two, the extrusion pressure and friction force they are subjected to are different, and there are slight differences in their own materials and hardening. This will cause the two sealing rings to have inconsistent wear after being used for a long period of time. Usually, the second sealing ring 6 is more worn, which makes the sealing structure unable to seal the workpiece 3 to be inspected for leaks.

[0052] Therefore, if Figures 6 to 8 As shown, the present embodiment further adjusts the setting position of the second sealing ring 6, and adjusts the position of the second sealing ring 6 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 tested for leakage. During sealing, the second sealing ring 6 is mainly pressed against the extension portion 34 of the workpiece 3 to be tested for leakage, and the second sealing ring 6 is only subjected to a clamping force, so it has a good sealing effect even after long-term use.

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

[0054] In order to further improve the sealing effect of the workpiece 3 to be inspected for leaks, the present embodiment adds a third sealing ring 4311 at the lower end of the base 431. Since the base 431 is bolted to the positioning plate 2, there may be a slight gap between the two, and there is a possibility of air leakage. The third sealing ring 4311 can prevent the leak detection gas from entering the interior of the sealing device from the lower end of the base 431.

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

[0056] In this solution, the moving distance of the movable rod 42 is limited, and the movement of the movable rod 42 is limited by the limiting step 4331 in the guide sleeve 43. Since the diameter of the sealing head 421 is relatively large, it can just touch the top of the limiting step 4331 when moving downward, preventing the movable rod 42 from moving downward excessively and ensuring the normal use of the sealing device; when the sealing head 421 moves upward, it just touches the top of the second cavity 332 of the workpiece 3 to be inspected for leaks.

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

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

[0059] Furthermore, a fifth sealing ring 23 is provided on the upper surface of the positioning plate 2 , and the fifth sealing ring 23 is used to press against the lower surface of the edge of the workpiece 3 to be leak-checked, so as to isolate the first cavity 331 from the outside.

[0060] The fifth sealing ring 23 is provided to make the inner cavity 33 of the workpiece 3 to be tested for leaks in a sealed state. When the workpiece 3 to be tested for leaks 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 tested for leaks is isolated from the outside world. Due to the provision of the second sealing ring 6, 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 of the oil passage and the inner cavity 33.

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

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

[0063] The driving member 12 is detachably mounted under the positioning plate 2 through the fixing plate 11, which is convenient for the maintenance and replacement of the driving member 12. The output end of the driving member 12 extends into the movable channel 21, and the driving member 12 drives the movable rod 42 to move, thereby blocking each channel of the workpiece 3 to be inspected for leaks.

[0064] Furthermore, the driving member 12 is a gas cylinder or an oil cylinder. In this embodiment, when a gas cylinder or an oil cylinder is used as a power source to drive the movable rod 42 to move up and down, it has the advantages of simple structure, low cost, easy installation and maintenance. In addition, the gas cylinder also has the characteristics of smooth movement and fast response speed, and can accurately control the moving distance of the movable rod 42 to ensure that the blocking device completes the blocking of each channel of the workpiece 3 to be inspected for leaks. The oil cylinder can be a hydraulic oil cylinder, which can withstand a large working pressure and has a long service life.

[0065] In particular, the present invention further proposes a leak detection method, comprising the following steps: S1. placing the workpiece 3 to be leak-detected on the positioning plate 2, and making the fifth sealing ring 23 press against the edge of the workpiece 3 to be leak-detected, so that the first cavity 331 is isolated from the outside;

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

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

[0068] The leak detection method is applicable to the above-mentioned plugging device, and thus has the same beneficial effects as the above-mentioned plugging device. The plugging device optimizes the overall structure, and realizes accurate sealing of the inner cavity 33 and the dual oil passages of the workpiece 3 to be leak-detected on the basis of ensuring the stability of leak detection. At the same time, the situation that two devices are originally required to perform leak detection on the inner cavity 33 and the oil passages respectively and successively is reduced to only one device to complete the leak detection operation of the inner cavity 33 and the dual oil passages, which not only effectively reduces the equipment cost, but also significantly improves the stability and reliability of the leak detection operation.

[0069] When necessary, other sealing devices may be used together with the plugging device of this solution, and the sealing device seals the remaining holes / channels of the workpiece to be leak-checked.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A blocking device, characterized in that: include: A drive assembly (1) is used to be mounted on a positioning plate (2), the positioning plate (2) is used to place and position a workpiece (3) to be leak-checked, 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); A movable component (4) is detachably arranged on the positioning plate (2), and one end of the movable component (4) extends into the movable channel (21) and is connected to the output end of the driving member (12), and the other end extends to the outside of the positioning plate (2) and extends into the workpiece (3) to be leak-checked, and the outer wall of the movable component (4) is provided with a first sealing ring (5) and a second sealing ring (6); The movable component (4) is also provided with a limiting protrusion (41), and 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 clamped 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 checked for leakage, and at the same time, the second sealing ring (6) isolates the second oil passage (32) and the inner cavity (33) of the workpiece (3) to be checked for leakage.

2. A blocking device according to claim 1, characterized in that: The movable assembly (4) comprises a movable rod (42) and a guide sleeve (43), wherein 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 driving assembly (1), and the top end thereof extends out of the guide sleeve (43); The lower end of the guide sleeve (43) is provided with the limiting protrusion (41); an installation gap (44) is provided 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 outer wall of the guide sleeve (43) is provided with the second sealing ring (6).

3. A blocking device according to claim 2, characterized in that: The guide sleeve (43) comprises a base (431), a first connecting section (432) and a second connecting section (433) which are arranged in sequence from bottom to top, and the base (431) is bolted to the positioning plate (2); The outer diameter of the base (431) is greater than the outer diameter of the first connecting section (432) and greater than 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 (3) to be leak-checked is also provided with an extension portion (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 pressed against the lower end of the extension portion (34) to isolate the first cavity (331) from the second cavity (332).

4. A blocking device according to claim 3, characterized in that: A third sealing ring (4311) is also provided at the lower end of the base (431), and the third sealing ring (4311) is tightly pressed against the upper surface of the positioning plate (2) to isolate the first cavity (331) from the interior of the blocking device.

5. A blocking device according to claim 3, characterized in that: A limiting step (4331) is provided inside the second connecting section (433); the top of the movable rod (42) is a blocking head (421); the outer diameter of the blocking head (421) is greater than the outer diameter of the movable rod (42); and the limiting step (4331) is used to limit the blocking head (421) when it moves downward.

6. A blocking device according to claim 5, characterized in that: The limiting step (4331) is provided with a fourth sealing ring (4332), and the fourth sealing ring (4332) is used to tightly abut against the lower end of the blocking head (421).

7. A blocking device according to claim 3, characterized in that: A fifth sealing ring (23) is provided on the upper surface of the positioning plate (2), and the fifth sealing ring (23) is used to press against the lower surface of the edge of the workpiece (3) to be leak-checked, so as to isolate the first cavity (331) from the outside.

8. A blocking device according to claim 2, characterized in that: The driving assembly (1) comprises a fixing plate (11) and a driving member (12), wherein the fixing plate (11) is mounted on the lower end of the positioning plate (2), the driving member (12) is detachably arranged on the fixing plate (11), and the output end of the driving member (12) passes through the fixing plate (11) and is connected to the movable rod (42).

9. A blocking device according to claim 8, characterized in that: The driving member (12) is a pneumatic cylinder or an oil cylinder.

10. A leak detection method, characterized in that: The steps include: S1. placing the workpiece (3) to be tested for leaks on the positioning plate (2), and making the fifth sealing ring (23) press against the edge of the workpiece (3) to be tested for leaks, so that the first cavity (331) is isolated from the outside; S2. Using the blocking device as described in claim 7 to isolate the first cavity (331) from the second cavity (332); S3. Use a leak detection device to simultaneously detect the sealing properties of the first oil passage (31), the second oil passage (32) and the inner cavity (33).

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