Helium detection vacuum box structure with high precision

Abstract

The utility model discloses a helium detection vacuum box structure with high precision, and relates to the technical field of valve body detection, the helium detection vacuum box structure comprises a vacuum box body and a loosening simulation assembly arranged on the vacuum box body, the loosening simulation assembly comprises a rod body arranged on the vacuum box body in a dynamic seal mode, and the rod body can move along the length direction of the rod body. A dismounting tool is arranged at one end, extending into the vacuum box body, of the rod body, so that when the valve body is limited in the vacuum box body, the dismounting tool can do similar actions towards the valve body until the dismounting tool is connected with a fastening bolt on the valve body in an inserting manner. According to the utility model, through the arrangement of the loosening simulation assembly, the dismounting tool on the loosening simulation assembly can be connected with the fastening bolt on the valve body in an inserted manner, and the dismounting tool can be used for driving the fastening bolt to be unscrewed by a certain angle, so that various loosening conditions of the valve body in practical application can be simulated; and then the sealing performance of the inner cavity of the valve body in various loose states is detected in sequence, so that the sealing performance of the valve body can be effectively tested.

Description

Technical Field

[0001] This utility model relates to the field of valve body detection technology, specifically to a high-precision helium detection vacuum chamber structure. Background Technology

[0002] After the entire valve body manufacturing process is successfully completed, rigorous sealing testing is an indispensable step, directly affecting the valve's performance and safety. Modern valve body designs typically incorporate an opening connecting to the internal chamber for sealing performance testing. Currently, the widely adopted testing method in the industry is the helium gas detection method. This method cleverly utilizes the unique properties of helium molecules—their extremely small size and light weight. During testing, helium gas is injected into the valve body's internal chamber. Even extremely small sealing defects are unlikely to prevent helium leakage. At this point, specialized helium gas detection equipment, like a keen hunter, can quickly detect the escaping helium molecules, thereby determining whether the valve body's sealing performance meets the standards. Those that fail are marked for further processing.

[0003] Ensuring that the valve body meets sealing standards before leaving the factory is a basic requirement. Even more stringent is maintaining a good seal during long-term use, even under adverse conditions such as loosening of fastening bolts. Therefore, valve body sealing testing is divided into two stages: preliminary testing and secondary testing. The former ensures the sealing performance of the valve body in its new condition, while the latter verifies the sealing stability of the valve body under simulated usage conditions.

[0004] At the forefront of technological innovation, patent document CN218470103U discloses an advanced dual-station helium detector design that integrates high efficiency and precision. The equipment consists of key components such as an upper frame, a dual-station helium detection mechanism, and a lower body. The upper frame sits securely on top of the lower body, with a platform plate cleverly positioned between them. A display unit is also installed at the top front of the upper frame for easy operation and monitoring. The dual-station helium detection mechanism is the core of the machine, comprising two parallel helium detection units, each horizontally positioned on the platform plate. Each unit is further subdivided into a feeding platform, a helium detection component, and a precision positioning mechanism. The helium detection component is securely mounted on the platform plate, with the end of the feeding platform's stroke positioned directly below the helium detection component. The precision positioning mechanism is responsible for accurately adjusting the position of the valve body to be tested on the feeding platform, ensuring detection accuracy.

[0005] This dual-station helium detector significantly improves testing efficiency thanks to its highly efficient design. However, when dealing with a specific product like a valve body, even with some structural adaptations, directly applying this equipment only allows it to perform preliminary testing of the valve body. It cannot perform the more critical secondary testing, making it inconvenient to use.

[0006] Based on this, we propose a high-precision helium detection vacuum chamber structure to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a high-precision helium detection vacuum chamber structure. This helium detection vacuum chamber structure can simulate different degrees of loosening of the fastening bolts on the valve body by setting up a loosening simulation component. Subsequently, sealing tests are performed on the valve body under different loosening states to obtain the sealing condition of the valve body under the corresponding state.

[0008] To solve the above problems, this utility model provides the following technical solution:

[0009] A high-precision helium detection vacuum chamber structure includes a vacuum chamber body and a loosening simulation component disposed on the vacuum chamber body. The loosening simulation component includes a rod body dynamically sealed on the vacuum chamber body, and the rod body can move along its length direction. One end of the rod body extending into the vacuum chamber body is provided with a disassembly and assembly tool, so that when the valve body is confined within the vacuum chamber body, the disassembly and assembly tool can move toward the valve body until the disassembly and assembly tool is inserted and connected with the fastening bolt on the valve body, after which the rod body can drive the disassembly and assembly tool to rotate.

[0010] As a further embodiment of this utility model: the loosening simulation component also includes a drive motor fixedly mounted on the vacuum chamber, and the output shaft of the drive motor extends into the vacuum chamber. The rod is slidably mounted on the output shaft and can move along the length of the output shaft. An elastic element is provided on the output shaft and fixedly connected to the rod, so that the output shaft, the rod and the elastic element together form a telescopic structure with a reset function.

[0011] As a further embodiment of this utility model: a gear is fixedly provided on the outside of the rod body, and the gear is arranged coaxially with the output shaft.

[0012] As a further embodiment of this utility model: the rod body is configured as a rectangular strip, and one rectangular end of the rod body is slidably mounted on the output shaft.

[0013] As a further embodiment of this utility model, the disassembly and assembly tool is detachably installed at the end of the rod away from the output shaft.

[0014] As a further embodiment of this utility model: the disassembly and assembly tool is an internal hex wrench, a cross wrench, or a socket wrench.

[0015] As a further embodiment of this invention, the vacuum chamber structure also includes a clamp disposed within the vacuum chamber.

[0016] As a further embodiment of this utility model: the clamp includes a lower positioning mold and an upper positioning mold, both located inside the vacuum chamber, with the lower positioning mold and the upper positioning mold located at the bottom and top of the vacuum chamber, respectively. The upper positioning mold can move toward or away from the lower positioning mold to form an adjustable clamping area between the upper positioning mold and the lower positioning mold.

[0017] As a further embodiment of this utility model: grooves are provided on the adjacent sides of the upper positioning mold and the lower positioning mold, so that when the upper positioning mold and the lower positioning mold are in the closed state, the grooves on the two together form a receiving cavity for accommodating the valve body.

[0018] As a further embodiment of this utility model, the vacuum chamber structure also includes a door for sealing the vacuum chamber and a two-dimensional motion mechanism for driving the door to open or seal the vacuum chamber.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The structure of this helium vacuum chamber uses a loosening simulation component. The disassembly and assembly tools on the loosening simulation component can be connected to the fastening bolts on the valve body. By using the disassembly and assembly tools, the fastening bolts can be loosened by a certain angle, thereby simulating various loosening conditions of the valve body in actual applications. Then, the sealing performance of the valve body cavity under various loosening conditions can be tested in sequence, which can effectively test the sealing performance of the valve body with high testing accuracy.

[0021] 2. The loosening simulation component of the helium detection vacuum chamber structure is ingeniously designed. It utilizes the output shaft of the drive motor, the rod, and the elastic element to form a telescopic structure with a reset function, realizing the flexible movement and automatic reset of the rod, which further improves the accuracy and stability of the detection.

[0022] 3. Through the gear set on the outside of the rod, the operator can know the rotation angle of the disassembly and assembly tool by the rotation angle of a certain tooth on the gear, and thus determine the degree of loosening of the fastening bolt. Different loosening conditions of the fastening bolt can be simulated relatively quickly.

[0023] 4. The rod body is designed as a rectangular strip, which facilitates sliding installation on the output shaft and improves the compactness and stability of the structure.

[0024] 5. The structure of this helium detection vacuum chamber, through the setting of clamps, can firmly hold the valve body, avoiding shaking or displacement during the detection process, thus improving the accuracy and stability of the detection.

[0025] 6. The fixture adopts a positioning lower mold and positioning upper mold design, which can adjust the size of the clamping area and is suitable for valve bodies of different sizes. This enhances the versatility and practicality of the helium detection vacuum chamber structure. In addition, the upper and lower layout design can avoid the space occupation problem caused by setting multiple helium filling pipes.

[0026] 7. Grooves are provided on the adjacent sides of the upper and lower positioning molds, which together form a receiving cavity for accommodating the valve body, so that the valve body can be clamped more securely, and at the same time improve the stability and accuracy of the valve body during the testing process.

[0027] 8. The structure of this helium detection vacuum chamber, through the setting of a chamber door and a two-dimensional motion mechanism, realizes the automatic opening and sealing of the chamber door, which improves the convenience and safety of operation, and also helps to improve the automation and efficiency of detection. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0031] Figure 3 This is a front view structural diagram of the present invention;

[0032] Figure 4 This is a three-dimensional structural diagram of the present invention with the adapter frame and the first drive source removed;

[0033] Figure 5 This is a schematic diagram of the three-dimensional structure of the loosening simulation component and valve body in this utility model. Figure 1 ;

[0034] Figure 6 This is a schematic diagram of the three-dimensional structure of the loosening simulation component and valve body in this utility model. Figure 2 ;

[0035] Figure 7 This is a schematic diagram of the three-dimensional structure of the loosening simulation component in this utility model. Figure 1 ;

[0036] Figure 8 This is a schematic diagram of the three-dimensional structure of the loosening simulation component in this utility model. Figure 2 ;

[0037] Figure 9 This is a schematic diagram of the three-dimensional structure of the rod and gear in this utility model.

[0038] In the diagram: 1. Vacuum chamber; 2. Fixture; 201. Lower positioning mold; 202. Upper positioning mold; 203. Groove; 3. Helium filling pipe; 4. Adapter frame; 5. First drive source; 6. Second drive source; 7. Chamber door; 8. Support bracket; 9. Guide rail; 10. Third drive source; 11. Fourth drive source; 12. Connector; 13. Loosening simulation component; 1301. Rod; 1302. Disassembly and assembly tool; 1303. Drive motor; 1304. Output shaft; 1305. Gear; a. Valve body. Detailed Implementation

[0039] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0040] Example 1:

[0041] like Figures 1-4 As shown, a highly adaptable helium detection vacuum chamber structure includes a vacuum chamber 1 and a door 7 for sealing the vacuum chamber 1. The vacuum chamber 1 is equipped with a clamp 2 for clamping and limiting the valve body a. A helium filling pipe 3 is dynamically sealed on the vacuum chamber 1. One end of the helium filling pipe 3 extends into the vacuum chamber 1 and can move along its length, thereby moving one end closer to or further away from the valve body a. The vacuum chamber 1 is also equipped with a connector 12 that communicates with its interior. Subsequent external negative pressure pipes can be directly connected to the connector 12 to achieve vacuuming treatment inside the vacuum chamber 1. After valve body a is clamped and positioned by clamp 2, the helium filling pipe 3 is driven to move closer to valve body a until one end of the helium filling pipe 3 is inserted into the opening of valve body a, achieving a sealed connection between the helium filling pipe 3 and the inner cavity of valve body a. Then, the vacuum chamber 1 is closed using the door 7, and a vacuum is drawn into the vacuum chamber 1. Then, helium gas at a certain pressure is filled into the inner cavity of valve body a using the helium filling pipe 3 and maintained for a period of time. Subsequently, a helium gas detection device is used to detect whether there is helium gas inside the vacuum chamber 1. If the presence of helium gas is detected inside the vacuum chamber 1, it indicates that valve body a is not in a good sealing state and is a defective product; if no helium gas is detected inside the vacuum chamber 1, it indicates that valve body a is in a good sealing state and is a qualified product.

[0042] This application, by setting up a vacuum chamber 1 and evacuating the vacuum chamber 1, allows the valve body a located on the fixture 2 to be in a negative pressure environment. When helium gas with a certain pressure is filled into the valve body a, a pressure difference will be generated between the inside of the valve body a and the vacuum chamber 1. If the valve body a has a sealing defect at this time, the helium gas will leak from the inner cavity of the valve body a into the vacuum chamber 1, thus achieving rapid and accurate detection.

[0043] In order to simultaneously test multiple types of valve bodies a, this application can set multiple sets of clamps 2 and helium filling pipes 3 and arrange them in a one-to-one correspondence. With the presence of multiple sets of clamps 2 and multiple sets of helium filling pipes 3, the two together form a multi-pair multi-mode layout. Then, during the test, multiple types of valve bodies a can be clamped and limited by multiple sets of clamps 2, and then the helium filling pipes 3 can be used to seal and connect with the valve bodies a on the corresponding clamps 2.

[0044] Alternatively, in order to test valve bodies a of different types with the same volume (specifically, each valve body a has the same volume but different opening orientations), this application sets the fixture 2 as a single set and the helium filling pipes 3 as multiple pipes. With the single set of fixtures 2 and multiple helium filling pipes 3, the two together form a one-to-many layout. Thus, during testing, multiple valve bodies a of the same volume but different types can be placed on the fixture 2 in sequence. According to the orientation of the opening on the valve body a, the helium filling pipe 3 with the same opening orientation as the valve body a is selected from the multiple helium filling pipes 3. The inner cavity of the valve body a is sealed by using the helium filling pipe 3 that is adapted to it. Figure 4 The diagram shows a setup with a set of clamps 2 and three helium-filling pipes 3, which can be matched with three types of valve bodies a for use.

[0045] To automate the movement of the helium filling pipe 3 towards or away from the valve body a, this application includes a connecting frame 4 fixedly mounted outside the vacuum chamber 1. A first drive source 5 is fixedly mounted on the connecting frame 4. The actuator of the first drive source 5 is fixedly connected to the end of the helium filling pipe 3 located outside the vacuum chamber 1. By utilizing the operation of the first drive source 5, the movement of the helium filling pipe 3 can be achieved. This movement can be controlled by... Figure 1 and Figure 2 To represent it.

[0046] Regarding the above-mentioned clamp 2, when there are multiple helium filling pipes 3 arranged along the same horizontal plane, since one end of the multiple helium filling pipes 3 extends into the vacuum chamber 1, it occupies a large horizontal space inside the vacuum chamber 1. Therefore, the clamp 2 of this application is preferably configured to longitudinally clamp and limit the valve body a.

[0047] like Figure 5As shown, specifically, the clamp 2 includes a lower positioning mold 201 and an upper positioning mold 202, both located inside the vacuum chamber 1. The lower positioning mold 201 and the upper positioning mold 202 are located at the bottom and top of the vacuum chamber 1, respectively. A second drive source 6 is fixedly installed on the vacuum chamber 1, and the execution end of the second drive source 6 penetrates into the vacuum chamber 1 and is fixedly connected to the upper positioning mold 202. The upper positioning mold 202 can move towards or away from the lower positioning mold 201 to form an adjustable clamping area between the upper positioning mold 202 and the lower positioning mold 201. The clamping area is used to clamp and limit the valve body a. In order to adapt to the shape of valve body a, grooves 203 are provided on the adjacent sides of the upper positioning mold 202 and the lower positioning mold 201, so that when the upper positioning mold 202 and the lower positioning mold 201 are in the closed state, the grooves 203 on the two together form a receiving cavity for accommodating valve body a. The receiving cavity is used to stably limit the valve body a. The receiving cavity can be set to the corresponding type according to the shape of valve body a.

[0048] like Figures 1-3 As shown, under normal circumstances, the door 7 is installed using a hinged installation method. This installation method requires the placement location to provide the space needed for the door 7 to rotate, resulting in a large overall volume of the door 7 and the vacuum chamber 1. To solve the inconvenience caused by the above installation method, this application also includes a two-dimensional motion mechanism for driving the door 7 to open or close the vacuum chamber 1. Specifically, the two-dimensional motion mechanism includes a support bracket 8 located on the side of the vacuum chamber 1. A guide rail 9 arranged vertically is fixedly installed on the support bracket 8. A third drive source 10 is installed on the guide rail 9. A slider is slidably installed on the guide rail 9, and the slider is fixedly connected to the execution end of the third drive source 10. A fourth drive source 11 is fixedly installed on the slider, and the execution end of the fourth drive source 11 moves horizontally. The door 7 is located on the execution end of the fourth drive source 11.

[0049] exist Figure 1 In the indicated state, the vacuum chamber 1 is open. When it is necessary to seal the vacuum chamber 1, the third drive source 10 can be used to drive the slider and the fourth drive source 11 to rise until the door 7 rises to the designated position with the vacuum chamber 1. Then, the fourth drive source 11 can be used to drive the door 7 to move towards the vacuum chamber 1 until the door 7 completely seals the vacuum chamber 1, achieving a sealed state for the vacuum chamber 1. This application, relying on a two-dimensional motion mechanism, can not only realize the opening or sealing of the vacuum chamber 1 by the door 7, but also requires less horizontal space for the door 7 to move.

[0050] It should be noted that the first drive source 5, the second drive source 6, the third drive source 10 and the fourth drive source 11 in this application are all conventional technical settings in the prior art. For example, all four can be cylinders, hydraulic cylinders or telescopic rods, etc.

[0051] Example 2:

[0052] like Figures 5-9 As shown, based on the requirement that valve body a must maintain a good sealing state even when encountering adverse conditions such as loosening of fastening bolts during long-term use, this application further provides a loosening simulation component 13 on the basis of embodiment one. The loosening simulation component 13 is disposed inside the vacuum chamber 1. Specifically, the loosening simulation component 13 includes a rod 1301 dynamically sealed on the vacuum chamber 1, and the rod 1301 can move along its length direction. One end of the rod 1301 extending into the vacuum chamber 1 is provided with a disassembly and assembly tool 1302. When valve body a is confined to clamp 2 inside vacuum chamber 1, rod 1301 can be driven to move toward valve body a until disassembly tool 1302 is inserted and connected to fastening bolt on valve body a. Subsequently, rod 1301 and disassembly tool 1302 are driven to rotate at a certain angle, which can loosen the fastening bolt by the corresponding angle. By changing the rotation angle of rod 1301 and disassembly tool 1302 each time, the loosening situation of fastening bolt at different angles can be simulated. Subsequently, by helium filling test, the sealing condition of the inner cavity of valve body a under each simulated state can be obtained.

[0053] like Figures 6-8 As shown, it should be noted that the installation of the rod 1301 on the vacuum chamber 1 can take many forms; for example, it can be installed with... Figure 4 The installation of the helium filling pipe 3 shown is consistent with that of the vacuum chamber 1. Preferably, this application proposes the following installation method: a drive motor 1303 is fixedly installed outside the vacuum chamber 1, the output shaft 1304 of the drive motor 1303 extends into the interior of the vacuum chamber 1, the rod 1301 is slidably installed on the output shaft 1304 and moves along the axial direction of the output shaft 1304, and an elastic element is also provided between the output shaft 1304 and the rod 1301 (not shown in the figure because the elastic element is located in the hollow cavity on the output shaft 1304). With the presence of the elastic element, the output shaft 1304, the rod 1301 and the elastic element constitute a telescopic structure with a reset function. That is, when the rod 1301 retracts along the axial direction of the output shaft 1304, the elastic element is compressed, and subsequently, the elastic element can reset the rod 1301 under its elastic action.

[0054] like Figure 5 As shown, based on the above-mentioned design of the rod 1301 installation method, when the initial sealing test of valve body a is completed and subsequent loosening simulation test is performed, the rod 1301 can be retracted along the axial direction of the output shaft 1304 first. Figure 5In the diagram, the rod 1301 and the disassembly / assembly tool 1302 move to the left, away from the clamp 2. At this point, the elastic element is compressed, allowing the valve body a to be tested to be placed on the clamp 2. Then, the restriction on the rod 1301 is released. Under the elastic action of the elastic element, the disassembly / assembly tool 1302 on the rod 1301 can be inserted into the fastening bolt on the valve body a. Subsequently, starting the drive motor 1303 will drive its output shaft 1304 to rotate the fastening bolt by a certain angle for subsequent sealing tests. During the axial movement of the disassembly / assembly tool 1302 and the insertion of the fastening bolt, if there is a certain installation deviation between the disassembly / assembly tool 1302 and the fastening bolt, simply rotating the output shaft 1304 manually will rotate the disassembly / assembly tool 1302 until it can be properly inserted into the fastening bolt, thus achieving the insertion connection between the disassembly / assembly tool 1302 and the fastening bolt.

[0055] For example Figures 5-9 As shown, during multiple loosening simulations of the fastening bolts on valve body a, to ensure the operator knows the angle of rotation each time, this application has a gear 1305 fixedly installed on the outside of the rod 1301. The gear 1305 is coaxially arranged with the output shaft 1304. By calculating the number of teeth on the gear 1305, the angle represented by rotating a single tooth can be determined. Subsequently, the operator can rotate the corresponding number of teeth to determine the angle of rotation, which is convenient to use. Of course, the operator can replace the gear 1305 with other components that indicate angles; this application is not limited to the use of such components.

[0056] like Figure 9 As shown, it should be noted that the rod 1301 is axially slidably mounted on the output shaft 1304. To ensure that only axial movement occurs between the rod 1301 and the output shaft 1304, the rod 1301 is designed to be non-cylindrical. For example, the rod 1301 can be designed as a rectangular strip, with one rectangular end of the rod 1301 slidably mounted on the output shaft 1304. The disassembly / reassembly tool 1302 is detachably mounted on the other rectangular end of the rod 1301. Depending on the type of fastening bolts on valve body a, the disassembly / reassembly tool 1302 is adapted to the type of fastening bolts. Depending on the type of fastening bolts, the disassembly / reassembly tool 1302 can be set as an Allen wrench, a Phillips head wrench, or a socket wrench, etc.

[0057] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A high-precision helium leak detection vacuum chamber structure, characterized in that, The vacuum box structure comprises a vacuum box body (1) and a loosening simulation assembly (13) arranged on the vacuum box body (1), the loosening simulation assembly (13) comprises a rod body (1301) arranged on the vacuum box body (1) and movable along the length direction of the rod body (1301), and one end of the rod body (1301) extending into the vacuum box body (1) is provided with a dismounting tool (1302), so that when a valve body (a) is located in the vacuum box body (1), the dismounting tool (1302) can move towards the valve body (a) until the dismounting tool (1302) is connected with a fastening bolt on the valve body (a), and then the rod body (1301) can drive the dismounting tool (1302) to rotate.

2. The high-precision helium leak detection vacuum chamber structure according to claim 1, wherein, The loosening simulation assembly (13) further comprises a driving motor (1303) fixedly arranged on the vacuum box body (1), and an output shaft (1304) of the driving motor (1303) extends into the vacuum box body (1), the rod body (1301) is slidably arranged on the output shaft (1304) and movable along the length direction of the output shaft (1304), and an elastic element is arranged on the output shaft (1304) and fixedly connected with the rod body (1301), so that the output shaft (1304), the rod body (1301) and the elastic element together form a telescopic structure with a reset function.

3. The high-precision helium leak detection vacuum chamber structure of claim 2, wherein, The rod body (1301) is externally provided with a gear (1305) arranged coaxially with the output shaft (1304).

4. The high-precision helium leak detection vacuum chamber structure according to claim 2 or 3, characterized in that, The rod body (1301) is in the shape of a rectangular long strip, and one rectangular end of the rod body (1301) is slidably arranged on the output shaft (1304).

5. The high-precision helium leak detection vacuum chamber structure according to claim 2 or 3, characterized in that, The dismounting tool (1302) is detachably arranged on one end of the rod body (1301) away from the output shaft (1304).

6. The high-precision helium leak detection vacuum chamber structure according to any one of claims 1-3, characterized in that, The dismounting tool (1302) is a hexagonal spanner, a cross spanner or a socket spanner.

7. The high-precision helium leak detection vacuum chamber structure according to any one of claims 1-3, characterized in that, The vacuum box structure further comprises a clamp (2) arranged in the vacuum box body (1).

8. The high-precision helium leak detection vacuum chamber structure of claim 7, wherein, The clamp (2) comprises a positioning lower die (201) and a positioning upper die (202) both arranged in the vacuum box body (1), and the positioning lower die (201) and the positioning upper die (202) are respectively arranged at the bottom and the top of the vacuum box body (1), the positioning upper die (202) can move towards or away from the positioning lower die (201), so that the positioning upper die (202) and the positioning lower die (201) form a clamping area with adjustable size.

9. The high-precision helium leak detection vacuum chamber structure of claim 8, wherein, The positioning upper die (202) and the positioning lower die (201) are both provided with a groove (203) on the approaching side, so that when the positioning upper die (202) and the positioning lower die (201) are in a closed mold state, the grooves (203) on the two dies together form a containing cavity for containing the valve body (a).

10. The high-precision helium leak detection vacuum chamber structure according to any one of claims 1-3, wherein, The vacuum box structure further comprises a box door (7) for sealing the vacuum box body (1) and a two-dimensional motion mechanism for driving the box door (7) to open or seal the vacuum box body (1).

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