An elongated workpiece leak detection device and clamp therefor

Abstract

The utility model provides a kind of slender workpiece leak detection device and its clamp, the clamp of slender workpiece leak detection device, comprising: first sealing seat, second sealing seat, first translation drive component, clamping seat and second translation drive component, first translation drive component is driven connection with second sealing seat, second sealing seat is driven by first translation drive component and is close to and away from first sealing seat, clamping seat is arranged between first sealing seat and second sealing seat, second translation drive component is driven connection with clamping seat, clamping seat is driven by second translation drive component and is close to and away from first sealing seat.The clamp of the utility model's slender workpiece leak detection device can better adapt to the structure of slender workpiece to form leak detection chamber, and the included angle can automatically drive workpiece to move and be pressed tightly sealed, to be able to quickly close leak detection chamber, it is convenient to carry out fast leak detection, simple structure, good sealing, leak detection accuracy is high.

Description

Technical Field

[0001] This utility model relates to the field of vacuum leak detection technology, specifically to a leak detection device and fixture for slender workpieces. Background Technology

[0002] After the end plugs are welded to both ends of slender workpieces, the weld seam needs to be tested for airtightness. Because slender workpieces have a large span and a small cross-sectional area, airtightness testing is necessary. However, for some specially shaped plugs, it is not possible to form a good seal, which can easily lead to misjudgment. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings and deficiencies in the prior art and to provide a leak detection device and fixture for slender workpieces.

[0004] One embodiment of this utility model provides a fixture for a leak detection device for slender workpieces, comprising: The assembly comprises a first sealing seat, a second sealing seat, a first translation drive assembly, a clamping seat, and a second translation drive assembly. The first translation drive assembly is driven to the second sealing seat. The second sealing seat moves closer to and away from the first sealing seat under the drive of the first translation drive assembly. The clamping seat is disposed between the first sealing seat and the second sealing seat. The second translation drive assembly is driven to the clamping seat. The clamping seat moves closer to and away from the first sealing seat under the drive of the second translation drive assembly. The clamping seat is provided with a clamping mechanism for clamping a workpiece. The first sealing seat is provided with a first chamber, a leak detection hole, a first inflation hole and a first loading inlet. The leak detection hole, the first inflation hole and the first loading inlet are all connected to the first chamber. The leak detection hole is located on the side of the first chamber away from the second chamber, and the first loading inlet is located on the side of the first sealing seat facing the second sealing seat. The second sealing seat is provided with a second chamber, a second inflation hole and a second loading inlet. The second inflation hole and the second loading inlet are both connected to the second chamber. The second loading inlet is located on the side of the second sealing seat facing the first sealing seat.

[0005] In some alternative embodiments, the first loading inlet is provided with a first seal arranged around the first loading inlet, and the second loading inlet is provided with a second seal arranged around the second loading inlet.

[0006] In some alternative embodiments, the first loading inlet gradually increases in the direction toward the outside of the first chamber, and the second loading inlet gradually increases in the direction toward the outside of the second chamber.

[0007] In some alternative embodiments, the first chamber has a communication port, the leak detection hole communicates with the communication port, and a third seal is provided between the leak detection hole and the first chamber, the third seal being arranged around the leak detection hole and the communication port.

[0008] In some optional embodiments, the first sealing seat is further provided with a sealing air cavity, an air inlet, a sealing air rod, and a support. The sealing air rod is movably disposed in the sealing air cavity. The air inlet communicates with the sealing air cavity and is located on the side of the sealing air rod away from the communication port. The sealing air rod can move towards or away from the third sealing element. The support is arranged around the communication port. After the sealing air rod moves toward the third sealing element, it can press the third sealing element against the support. The leak detection hole is located on the sealing gas rod.

[0009] In some optional embodiments, a reset elastic element is provided inside the sealing air cavity. The reset elastic element is located on the side of the sealing air rod away from the air inlet. The reset elastic element is connected to the inner wall of the sealing air cavity and the sealing air rod, respectively.

[0010] In some alternative embodiments, the first sealing seat is provided with a third air inlet, which extends to the side of the third sealing member away from the communication port.

[0011] In some alternative embodiments, the third seal includes at least two sealing rings and at least one spacer ring, the sealing rings and the spacer rings being arranged at intervals from the sealing gas rod to the support, both the sealing rings and the spacer rings being arranged around the leak detection hole and the communication port, the inflation hole extending to one of the spacer rings on the side away from the communication port.

[0012] In some alternative embodiments, the first chamber includes a plug-shaped cavity and a long tube-shaped cavity that are interconnected, the long tube-shaped cavity being connected to the leak detection hole, the first loading inlet being connected to the plug-shaped cavity, and the first inflation hole being connected to either the plug-shaped cavity or the long tube-shaped cavity.

[0013] Another embodiment of this utility model provides a leak detection device for slender workpieces, including: a fixture as described above for a leak detection device for slender workpieces.

[0014] Compared with the prior art, the clamp of the leak detection device for slender workpieces of this utility model can better adapt to the structure of slender workpieces to form a leak detection chamber. The included angle can automatically drive the workpiece to move and press and seal, thereby quickly closing and forming a leak detection chamber at each end of the workpiece, which facilitates rapid leak detection. It has a simple structure, good sealing performance, and high leak detection accuracy.

[0015] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixture of a leak detection device for slender workpieces according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the fixture and the elongated workpiece in a leak detection device for elongated workpieces according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of the fixture and the elongated workpiece in a leak detection device for slender workpieces according to an embodiment of the present invention. Figure 4 for Figure 3 The enlarged view at point A is shown below; Figure 5 This is a cross-sectional view of the first sealing seat according to an embodiment of the present invention; Figure 6 for Figure 3 The enlarged view at point B is shown below; Figure 7 This is a cross-sectional view of the second sealing seat according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 10. First sealing seat; 11. First chamber; 111. Connecting port; 112. Third sealing element; 1121. Sealing ring; 1122. Spacer ring; 113. Plug-shaped cavity; 114. Long tube-shaped cavity; 12. Leak detection hole; 13. First inflation hole; 14. First loading inlet; 141. First sealing element; 15. Sealing air chamber; 151. Reset elastic element; 16. Air inlet; 17. Sealing air rod; 18. Support part; 19. Third sealing element 20. Air vent; 21. Second sealing seat; 22. Second chamber; 23. Second air inlet; 231. Second sealing element; 30. First translation drive assembly; 40. Clamping seat; 41. Clamping mechanism; 42. Lifting seat; 50. Second translation drive assembly; 60. Body; 61. First plug; 62. Second plug; 621. Port; 63. Inner cavity; 64. Long tube body; 70. First leak detection chamber; 80. Second leak detection chamber. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] Please see Figures 1 to 3 This invention provides a fixture for a leak detection device for slender workpieces, comprising: The assembly comprises a first sealing seat 10, a second sealing seat 20, a first translation drive assembly 30, a clamping seat 40, and a second translation drive assembly 50. The first translation drive assembly 30 is driven to the second sealing seat 20. The second sealing seat 20 moves closer to and further away from the first sealing seat 10 under the drive of the first translation drive assembly 30. The clamping seat 40 is disposed between the first sealing seat 10 and the second sealing seat 20. The second translation drive assembly 50 is driven to the clamping seat 40. The clamping seat 40 moves closer to and further away from the first sealing seat 10 under the drive of the second translation drive assembly 50.

[0023] The clamping seat 40 moves closer to and further away from the first sealing seat 10 under the drive of the second translation drive assembly 50. The clamping seat 40 is provided with a clamping mechanism 41 for clamping the body 60 of the workpiece. After the workpiece is placed on the clamping seat 40, the clamping mechanism 41 clamps the body 60. When the second translation drive assembly 50 drives the clamping seat 40 to move, it can drive the workpiece to move.

[0024] The specific structure of the clamping mechanism 41 can be designed according to actual needs. For example, the clamping mechanism 41 includes two clamping plates disposed on the clamping seat 40 and a clamping cylinder for driving the clamping plates to move, but this is not a limited example. The clamping mechanism 41 is actually a relatively common technology, and will not be described in detail here.

[0025] In addition, to improve the stability of workpiece placement, a support seat 42 can be provided between the clamping seat 40 and the first sealing seat 10 and / or between the clamping seat 40 and the second sealing seat 20. The support seat 42 is used to support the body 60. When the second translation drive assembly 50 drives the clamping seat 40 to move, thereby driving the workpiece to move, the body 60 can slide relative to the support seat 42.

[0026] Please see Figure 4 and Figure 5 The first sealing seat 10 is provided with a first chamber 11, a leak detection hole 12, a first inflation hole 13 and a first loading inlet 14. The leak detection hole 12, the first inflation hole 13 and the first loading inlet 14 are all connected to the first chamber 11. The leak detection hole 12 is located on the side of the first chamber 11 away from the second chamber 21, and the first loading inlet 14 is located on the side of the first sealing seat 10 facing the second sealing seat 20. Please see Figure 6 and Figure 7 The second sealing seat 20 is provided with a second chamber 21, a second inflation hole 22, and a second loading inlet 23. The second inflation hole 22 and the second loading inlet 23 are both connected to the second chamber 21. The second loading inlet 23 is located on the side of the second sealing seat 20 facing the first sealing seat 10.

[0027] In this embodiment, an elongated workpiece including a body 60, a first plug 61, and a second plug 62 is used as an example for explanation. The first plug 61 and the second plug 62 are welded to both ends of the body 60, respectively. A first weld is formed between the body 60 and the first plug 61, and a second weld is formed between the second plug 62 and the body 60. The body 60 has an inner cavity 63, and the first plug 61 has a port 621 that communicates with the inner cavity 63.

[0028] The working principle of the fixture in a leak detection device for slender workpieces according to one embodiment of this utility model is explained below: Before leak detection, the leak detection hole 12 is connected to the leak detector, the first inflation hole 13 and the second inflation hole 22 are both connected to the vacuum pump, and the first inflation hole 13 and the second inflation hole 22 are both connected to the leak detection gas source. The elongated workpiece is placed on the lifting mechanism, and then the clamping seat 40 moves toward the first sealing seat 10 under the drive of the second translation drive assembly 50, so that the first plug 61 of the elongated workpiece enters the first chamber 11 from the first loading inlet 14, and the body 60 abuts against the first sealing seat 10. Part of the first plug 61 passes through the first chamber 11 and extends into the leak detection hole 12. At this time, the inner wall of the first chamber 11, the outer side of the body 60 and the outer side of the first plug 61 together form the first leak detection cavity 70. The first weld is located in the first leak detection cavity 70, the leak detection hole 12 is located outside the first leak detection cavity 70, and the port 621 of the first plug 61 is located outside the first leak detection cavity 70 and inside the leak detection hole 12. The leak detection hole 12 is connected to the port 621 of the first plug 61. The first translation drive assembly 30 drives the second sealing seat 20 to press against the body 60 of the elongated workpiece, causing the second plug 62 to enter the second chamber 21 from the second loading inlet 23. The body 60 presses against the second sealing seat 20. At this time, the inner wall of the second chamber 21, the outer side of the body 60, and the outer side of the second plug 62 together form the second leak detection chamber 80, and the second weld is located within the second leak detection chamber 80. Furthermore, when the second sealing seat 20 presses against the body 60 under the drive of the first translation drive assembly 30, it also causes the body 60 to press against the first sealing seat 10, facilitating the formation of a seal.

[0029] Please see Figure 4 and Figure 6During leak detection, a vacuum pump evacuates the first leak detection chamber 70 through the first inflation port 13 and the second leak detection chamber 80 through the second inflation port 22. After the first and second leak detection chambers 70 and 80 reach a suitable vacuum level, a leak detection gas source injects leak detection gas (e.g., helium) into the first leak detection chamber 70 through the first inflation port 13 and into the second leak detection chamber 80 through the second inflation port 22. The leak detector determines whether the workpiece is qualified by detecting the leak detection gas. If there is a leak in the first weld, the leak detection gas in the first leak detection chamber 70 will enter the inner cavity 63 from the leak point, then leak out from the port 621 of the first plug 61, and finally flow to the leak detector through the leak detection port 12. If there is a leak in the second weld, the leak detection gas in the second leak detection chamber 80 will enter the inner cavity 63 from the leak point, then leak out from the port 621 of the first plug 61, and finally flow to the leak detector through the leak detection port 12. The specific leak detection principle is a well-known technique to those skilled in the art and will not be elaborated here.

[0030] Because the first leak detection cavity 70 and the second leak detection cavity 80 can be quickly formed at both ends of slender workpieces, it is beneficial to improve the leak detection rate, and the structure is simple and the clamping is stable. Of course, in other embodiments, it is not limited to leak detection of such slender workpieces.

[0031] In some alternative embodiments, the first loading inlet 14 is provided with a first sealing element 141 arranged around the first loading inlet 14, and the second loading inlet 23 is provided with a second sealing element 231 arranged around the second loading inlet 23. The body 60 of the elongated workpiece can press against the first sealing element 141, thereby improving the sealing between the body 60 and the first loading inlet 14, and the body 60 of the elongated workpiece can press against the second sealing element 231, thereby improving the sealing between the body 60 and the second loading inlet 23.

[0032] In some optional embodiments, the first loading inlet 14 gradually increases in the direction towards the outside of the first chamber 11, and the second loading inlet 23 gradually increases in the direction towards the outside of the second chamber 21. Driven by the first translational drive assembly 30, the second sealing seat 20 causes the body 60 to press against the first sealing seat 10, so that the body 60 abuts against the first loading inlet 14. Since the first loading inlet 14 is funnel-shaped, it helps to better support the body 60 and allows the first sealing element 141 to be better pressed by the body 60, improving sealing performance. The same applies to the second loading inlet 23. In this embodiment, both the first sealing element 141 and the second sealing element 231 include multiple elastic rings. The elastic rings of the first sealing element 141 are sequentially arranged in the first loading inlet 14 in the direction towards the outside of the first chamber 11, and the elastic rings of the second sealing element 231 are sequentially arranged in the second loading inlet 23 in the direction towards the outside of the second chamber 21.

[0033] In some alternative embodiments, the first chamber 11 has a connecting port 111, the leak detection hole 12 communicates with the connecting port 111, and a third sealing member 112 is provided between the leak detection hole 12 and the first chamber 11. The third sealing member 112 is arranged around the leak detection hole and the connecting port 111, and the third sealing member 112 abuts against the outer wall of the first plug 61, thereby improving the sealing performance between the first plug 61 and the connecting port 111 and thus improving the sealing performance of the first leak detection chamber 70.

[0034] After the main body 60 is driven by the clamping seat 40 to abut against the first sealing seat 10, the first plug 61 enters the first chamber 11, and the second sealing seat 20, driven by the first translational drive assembly 30, also drives the main body 60 to press against the first sealing seat 10, so that the main body 60 is firmly pressed on the first sealing seat 10. However, the third sealing member 112 does not yet have a pressing force. Therefore, in some optional embodiments, the first sealing seat 10 is also provided with a sealing air chamber 15, an air inlet 16, a sealing air rod 17, and a support part 18. The sealing air rod 17 is movably disposed in the sealing air chamber 15. The air inlet 16 communicates with the sealing air chamber 15 and is located on the side of the sealing air rod 17 away from the communication port 111. The sealing air rod 17 can move towards or away from the third sealing member 112. The support part 18 is arranged around the communication port 111. The sealing air rod 17 faces towards After moving towards the third seal 112, it can press the third seal 112 against the support part 18. The leak detection hole 12 is provided on the sealing air rod 17. Part of the first plug 61 passes through the connecting port 111 and extends into the leak detection hole 12. The air inlet 16 is inflated, so that the part of the sealing air chamber 15 located on the side of the sealing air rod 17 facing the air inlet 16 expands. Then, the air pressure drives the sealing air rod 17 to move towards the connecting port 111, so that the sealing air rod 17 presses the third seal 112 against the support part 18. When the third seal 112 is pressed against the support part 18, it generates elastic deformation. Part of the elastic deformation of the third seal 112 will be towards the outside of the first plug 61, so that the third seal 112 is pressed tightly against the first plug 61. Thus, the sealing between the connecting port 111 and the first plug 61 is improved by the third seal 112.

[0035] In some optional embodiments, a reset elastic element 151 is provided in the sealing air cavity 15. The reset elastic element 151 is located on the side of the sealing air rod 17 away from the air inlet 16. The reset elastic element 151 is connected to the inner wall of the sealing air cavity 15 and the sealing air rod 17 respectively. After the air inlet 16 is filled with air through the sealing air cavity 15, the sealing air rod 17 moves toward the communication port 111. The sealing air rod 17 will squeeze the reset elastic element 151. After the sealing air cavity 15 is released through the air inlet 16, the elastic force of the reset elastic element 151 can be used to reset the sealing air rod 17.

[0036] In some optional embodiments, the first sealing seat 10 is provided with a third air inlet 19, which extends to the side of the third sealing member 112 away from the communication port 111. After the slender workpiece is clamped, the sealing between the third sealing member 112, the support part 18 and the first plug 61 can be pre-checked for leaks to avoid the leakage of the leak detection gas in the first leak detection chamber 70 from the third sealing member 112, the support part 18 and the first plug 61 to the leak detection hole 12, which would lead to false leak detection. The specific steps for pre-detection of leaks are as follows: After evacuating the first leak detection chamber 70 to the set vacuum level, leak detection gas is injected into the side of the third seal 112 away from the connecting port 111 through the third inflation port 19. If there is a leak between the third seal 112, the connecting port 111 and the first plug 61, the leak detection gas will pass through the third seal 112, the connecting port 111 and the first plug 61, and finally enter the leak detection port 12 and be detected by the leak detector.

[0037] In some alternative embodiments, the third seal 112 includes at least two sealing rings 1121 and at least one spacer ring 1122. The sealing rings 1121 and spacer rings 1122 are arranged at intervals from the sealing gas rod to the support 18. Both the sealing rings 1121 and spacer rings 1122 surround the leak detection hole 12 and the communication port 111. The inflation hole extends to the side of one of the spacer rings 1122 away from the communication port 111. This design allows the support 18 and the sealing gas rod 17 to abut against different sealing rings 1121, thereby ensuring that the elastic deformation of the sealing rings 1121 is sufficient to achieve a seal. This avoids the situation where a single sealing ring 1121 cannot adapt to the seal due to insufficient elasticity. Moreover, the design of the spacer rings 1122 facilitates the filling of helium into the third inflation hole 19, preventing the sealing rings 1121 from causing elastic deformation and blocking the third inflation hole 19.

[0038] In this embodiment, a long tube 64 is formed on the first plug 61, and the long tube 64 extends away from the body 60. In order to adapt to the shape of the first plug 61 and the body 60, the first chamber 11 includes a plug-shaped cavity 113 and a long tube-shaped cavity 114 that are interconnected. The long tube-shaped cavity 114 is connected to the leak detection hole 12. The first loading inlet 14 is connected to the plug-shaped cavity 113. The first inflation hole 13 is connected to the plug-shaped cavity 113 or the long tube-shaped cavity 114. Parts of the body 60 and the first plug 61 are located in the plug-shaped cavity 113, while part of the long tube 64 is located in the long tube-shaped cavity 114. The other part of the long tube 64 is located in the leak detection hole 12.

[0039] The specific structures of the first translation drive assembly 30 and the second translation drive assembly 50 can be designed according to actual needs. For example, the first translation drive assembly 30 and the second translation drive assembly 50 can be a lead screw drive assembly, a rotary motor translation drive assembly, a belt translation drive assembly, a cylinder translation drive assembly, or a linear motor translation drive assembly. In this embodiment, the first translation drive assembly 30 and the second translation drive assembly 50 are cylinder translation drive assemblies.

[0040] The fixture of the above-mentioned leak detection device for slender workpieces can be applied to the leak detection device for slender workpieces, which includes: the fixture of the leak detection device for slender workpieces as described above.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for a leak detection device for slender workpieces, characterized in that, include: The assembly comprises a first sealing seat, a second sealing seat, a first translation drive assembly, a clamping seat, and a second translation drive assembly. The first translation drive assembly is driven to the second sealing seat. The second sealing seat moves closer to and away from the first sealing seat under the drive of the first translation drive assembly. The clamping seat is disposed between the first sealing seat and the second sealing seat. The second translation drive assembly is driven to the clamping seat. The clamping seat moves closer to and away from the first sealing seat under the drive of the second translation drive assembly. The clamping seat is provided with a clamping mechanism for clamping a workpiece. The first sealing seat is provided with a first chamber, a leak detection hole, a first inflation hole and a first loading inlet. The leak detection hole, the first inflation hole and the first loading inlet are all connected to the first chamber. The first loading inlet is located on the side of the first sealing seat facing the second sealing seat. The second sealing seat is provided with a second chamber, a second inflation hole and a second loading inlet. The second inflation hole and the second loading inlet are both connected to the second chamber. The second loading inlet is located on the side of the second sealing seat facing the first sealing seat. The leak detection hole is located on the side of the first chamber away from the second chamber.

2. The fixture for a leak detection device for slender workpieces according to claim 1, characterized in that: The first loading inlet is provided with a first sealing element arranged around the first loading inlet, and the second loading inlet is provided with a second sealing element arranged around the second loading inlet.

3. The fixture for a leak detection device for slender workpieces according to claim 1, characterized in that: The first loading inlet gradually increases in the direction toward the outside of the first chamber, and the second loading inlet gradually increases in the direction toward the outside of the second chamber.

4. The fixture for a leak detection device for slender workpieces according to claim 1, characterized in that: The first chamber has a connecting port, the leak detection hole is connected to the connecting port, and a third sealing element is provided between the leak detection hole and the first chamber, the third sealing element being arranged around the leak detection hole and the connecting port.

5. The fixture for a leak detection device for slender workpieces according to claim 4, characterized in that: The first sealing seat is further provided with a sealing air chamber, an air inlet, a sealing air rod, and a support. The sealing air rod is movably disposed in the sealing air chamber. The air inlet communicates with the sealing air chamber and is located on the side of the sealing air rod away from the communication port. The sealing air rod can move towards or away from the third sealing element. The support is arranged around the communication port. After the sealing air rod moves toward the third sealing element, it can press the third sealing element against the support. The leak detection hole is located on the sealing gas rod.

6. The fixture for a leak detection device for slender workpieces according to claim 5, characterized in that: A reset elastic element is provided inside the sealed air cavity. The reset elastic element is located on the side of the sealing air rod away from the air inlet. The reset elastic element is connected to the inner wall of the sealed air cavity and the sealing air rod.

7. The fixture for a leak detection device for slender workpieces according to claim 5, characterized in that: The first sealing seat is provided with a third air inlet, which extends to the side of the third sealing member away from the communication port.

8. The fixture for a leak detection device for slender workpieces according to claim 7, characterized in that: The third seal includes at least two sealing rings and at least one spacer ring, the sealing rings and the spacer rings being arranged at intervals from the sealing gas rod to the support portion, the sealing rings and the spacer rings being arranged around the leak detection hole and the communication port, and the inflation hole extending to one of the spacer rings on the side away from the communication port.

9. The fixture of the leak detection device for slender workpieces according to any one of claims 1 to 8, characterized in that: The first chamber includes a plug-shaped cavity and a long tube-shaped cavity that are interconnected. The long tube-shaped cavity is connected to the leak detection hole. The first loading inlet is connected to the plug-shaped cavity. The first inflation hole is connected to either the plug-shaped cavity or the long tube-shaped cavity.

10. A leak detection device for slender workpieces, characterized in that, include: A fixture for a leak detection device for slender workpieces as described in any one of claims 1 to 9.

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