Compensation tool for leakage detection of vacuum cover at end of welding seam
By designing compensation fixtures, the problem of insufficient sealing in the vacuum hood leakage detection of weld ends was solved, enabling complete detection of weld ends and ensuring the reliability and efficiency of the detection.
Patent Information
- Application Number
- CN202423174016.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In the detection of leaks in the vacuum hood at the weld ends, it is difficult to achieve a seal at both ends of the weld, resulting in some welds being undetectable.
Design a compensation fixture including a base, an extension, a seal, and a bracket. The extension extends the workpiece to form a sealed fit, and the seal and bracket ensure the stability of the fixture on the workpiece, thereby achieving a seal between the vacuum hood and the extension.
This ensured the airtightness of the vacuum chamber, enabling complete leak detection at the weld ends and improving the reliability and efficiency of the detection.
Smart Images
Figure CN223500579U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of nondestructive testing technology, specifically to a compensation tooling for detecting leaks in a vacuum hood at the weld end. Background Technology
[0002] Welding is a critical and indispensable technology in nuclear power plants. It plays a vital role in the construction, power generation efficiency, and safety of nuclear power plants. Evaluating the quality of welding technology requires non-destructive testing (NDT). The proper implementation of NDT can ensure the quality and safety of welds, improve production efficiency, reduce economic losses, and promote the advancement of welding technology.
[0003] In nuclear power engineering, 100% leak detection is required for the butt welds of steel linings and stainless steel pools. In non-destructive testing, leak detection primarily aims to check for penetrating defects in the welds, thereby ensuring that the weld quality meets the sealing requirements of the nuclear power facility.
[0004] In actual testing, when using the vacuum chamber testing method to detect leaks in welds, at both ends of the weld, because the opening of the vacuum chamber needs to be sealed to the workpiece being inspected to ensure the airtightness inside the vacuum chamber, there will always be a small section of weld that needs to contact the opening of the vacuum chamber and cannot be located inside the vacuum chamber to achieve leak detection. Thus, the welding quality at both ends of the weld cannot be determined. Utility Model Content
[0005] This application provides a compensation fixture for detecting leaks in a vacuum hood at the weld end. By extending the weld end portion on the workpiece under inspection so that the side of the vacuum hood opening can form a sealing fit with the extended portion, leakage detection at the weld end is achieved.
[0006] This application is achieved through the following technical solution:
[0007] A compensation fixture for detecting leaks in a vacuum hood at weld ends, comprising:
[0008] The base has a first working surface;
[0009] An extension member connected to the base, the extension member having a second working surface;
[0010] A sealing element, which is connected to the extension and is used to contact the end face of the workpiece being inspected, the sealing element having a first mating surface and a second mating surface flush with the second working surface, the first mating surface and the second mating surface being used to mate with a vacuum hood, respectively.
[0011] A bracket, which is connected to the base and is used to form a fixed fit with the workpiece being inspected;
[0012] In the working state, when the base contacts the workpiece under inspection through the first working surface, the second working surface of the extension is connected to the workpiece under inspection through the sealing element and is flush with the detection surface of the workpiece under inspection.
[0013] The compensation fixture for leak detection of vacuum hood at weld ends provided in this application can extend the workpiece under inspection by setting an extension, so that one side of the vacuum hood opening can contact the second working surface on the extension to form a sealed fit. The sealing element ensures the sealing between the extension and the workpiece under inspection, thereby ensuring the sealing inside the vacuum hood. Furthermore, the bracket and base ensure that the fixture can maintain a stable state on the workpiece under inspection, thereby ensuring the sealing performance between the vacuum hood and the extension and ensuring the normal operation of leak detection.
[0014] In some alternative embodiments, the first working surface is configured as a plane.
[0015] In some alternative embodiments, the seal is configured as a sealing strip.
[0016] In some alternative embodiments, the sealing strip is configured as a cuboid.
[0017] In some alternative embodiments, the bracket is provided with a slot, through which the bracket engages with the workpiece being inspected.
[0018] In some alternative embodiments, a clamping wedge is also included, which is used to engage between the bracket and the workpiece being inspected.
[0019] In some optional embodiments, the length of the second working surface is configured to be not less than 100 mm.
[0020] In some alternative embodiments, the bracket is welded to the base.
[0021] In some alternative embodiments, the extension is welded to the base.
[0022] In some alternative embodiments, the number of supports is configured to be two, with the two supports located on opposite sides of the base.
[0023] Compared with the prior art, this application has the following advantages and beneficial effects:
[0024] The compensation fixture for leak detection of vacuum hood at weld ends provided in this application can extend the workpiece under inspection by setting an extension, so that one side of the vacuum hood opening can contact the second working surface on the extension to form a sealed fit. The sealing element ensures the sealing between the extension and the workpiece under inspection, thereby ensuring the sealing inside the vacuum hood. Furthermore, the bracket and base ensure that the fixture can maintain a stable state on the workpiece under inspection, thereby ensuring the sealing performance between the vacuum hood and the extension and ensuring the normal operation of leak detection. Attached Figure Description
[0025] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of this application. In the drawings:
[0026] Figure 1 A top view of the compensation fixture for detecting leaks in a vacuum hood at weld ends, provided in an embodiment of this application, during use.
[0027] Figure 2 This is a side view of the compensation fixture for detecting leakage in a vacuum hood at the weld end, provided in an embodiment of this application.
[0028] Figure 3 A side view cross-sectional structural diagram of a compensation fixture for detecting leakage in a vacuum hood at the weld end, provided in an embodiment of this application.
[0029] Figure 4 This is a side view of the compensation fixture for detecting leaks in a vacuum hood at the weld end, as provided in an embodiment of this application.
[0030] The attached diagram shows the markings and corresponding component names:
[0031] 1-Extension, 2-Seal, 3-Bracket, 4-Clamping wedge, 5-Workpiece under inspection, 6-Base. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.
[0033] During the construction of nuclear power plants, leak detection is typically performed on the welds of the steel lining. These welds are formed by welding together two plates, which may be flat or curved. The end faces of the two plates are flush along the length of the weld. The vacuum enclosure is usually a rectangular structure with a rectangular opening. During inspection, the enclosure is placed over the weld, meaning part of the weld is inside the vacuum enclosure. In this case, the interior of the vacuum enclosure is a sealed space. If a leak exists, gas can travel from the other side of the plate through the weld into the vacuum enclosure. When inspecting the ends of the weld, because the opening needs to be in contact with the solid structure to create a sealed environment, a portion of the weld end with a length at least equal to the vacuum enclosure wall cannot be inspected without additional measures. Therefore, we need to design a fixture to address this issue.
[0034] Please refer to them together. Figures 1-4 This application provides a compensation fixture for detecting leaks in a vacuum hood at the weld end. The compensation fixture includes a base 6, an extension 1, a seal 2, and a bracket 3.
[0035] The specific shape and structure of the base 6 are not limited and can be constructed in any shape. During operation, the base 6 needs to contact the workpiece 5 to achieve positioning. Therefore, a first working surface is provided on the base 6 to fit against the workpiece 5. The type of the first working surface depends on the type of the workpiece 5. For example, if the surface of the workpiece 5 that contacts the base 6 is curved, the first working surface can be constructed as a corresponding curved surface. If the surface of the workpiece 5 that contacts the base 6 is flat, the first working surface can be constructed as a flat surface. If the surface of the workpiece 5 that contacts the base 6 is toothed, the first working surface can be constructed as a corresponding toothed surface.
[0036] The extension 1 is connected to the base 6. The extension 1 has a second working surface. The second working surface is used to seal and contact the vacuum hood opening. Since the vacuum hood opening is a plane, the second working surface can be constructed as a plane in actual implementation.
[0037] The sealing element 2 is connected to the extension element 1 and is used to contact the end face of the workpiece 5 under inspection. That is, the sealing element 2 is used to fill the gap between the extension element 1 and the end face of the workpiece 5 under inspection. The sealing element 2 has a first mating surface and a second mating surface that are flush with the second working surface. The first mating surface and the second mating surface are used to cooperate with the vacuum hood, so that after one part of the vacuum hood opening contacts the workpiece 5 under inspection, the other part can contact the first mating surface, the second mating surface, and the second working surface. That is, the extension element 1, the sealing element 2, the workpiece 5 under inspection, and the vacuum hood together form a sealed space. The specific structure of the other parts of the sealing element 2, except for the first mating surface and the second mating surface, is not limited as long as it does not cover the weld part other than the end face of the workpiece 5 under inspection. That is, the structure of this part of the sealing element 2 can be arbitrary.
[0038] The bracket 3 is connected to the base 6 and is used to form a fixed fit with the workpiece 5 under inspection. That is, after the base 6 contacts and positions itself with the workpiece 5 under inspection through the first working surface, the base 6 is positioned and maintained by forming a fixed fit with the workpiece 5 under inspection.
[0039] In the working state, when the base 6 contacts the workpiece 5 under inspection through the first working surface, the second working surface of the extension 1 connects with the workpiece 5 under inspection through the sealing element 2 and is flush with the inspection surface of the workpiece 5 under inspection.
[0040] In use, the first working surface on the base 6 is brought into contact with the workpiece 5 to be inspected. The position of the base 6 is adjusted so that the sealing element 2 is in contact with the end face of the workpiece 5 to be inspected. At this time, the workpiece 5 to be inspected, the first mating surface, the second mating surface, and the second working surface are coplanar, so that the workpiece 5 to be inspected, the first mating surface, the second mating surface, and the second working surface are simultaneously in contact with the opening of the vacuum chamber, so that the end of the weld is located in the vacuum chamber. The bracket 3 forms a fixed fit with the workpiece 5 to be inspected, and the leakage detection process can then be carried out.
[0041] Among them, the inspection surface of the workpiece 5 is usually the welding operation surface, which is usually a plane; if the inspection surface is a curved surface, then the coplanarity of the second working surface and the inspection surface means that the second working surface and the inspection surface are located on the same circumference; if the inspection surface is another type of surface, then the coplanarity of the second working surface and the inspection surface can be understood as the second working surface being a derivative surface of the inspection surface according to the changing pattern of the inspection surface.
[0042] The compensation fixture for leak detection of vacuum hood at weld ends provided in this application can extend the workpiece 5 under inspection by setting the extension 1, so that the side of the vacuum hood opening can contact the second working surface on the extension 1 to form a sealed fit. The sealing element 2 is set to ensure the sealing between the extension 1 and the workpiece 5 under inspection, thereby ensuring the sealing inside the vacuum hood. Furthermore, the bracket 3 and the base 6 are set to ensure that the fixture can maintain a stable state on the workpiece 5 under inspection, thereby ensuring the sealing performance between the vacuum hood and the extension 1 and ensuring the normal operation of leak detection.
[0043] In some alternative embodiments, the first working surface is configured as a plane.
[0044] In this embodiment, the workpiece 5 being inspected is typically flat. Therefore, configuring the first working surface as a plane can adapt to most usage environments. Even if the workpiece 5 being inspected has other shapes, configuring the first working surface as a plane also helps to improve the ease of positioning between the base 6 and the workpiece 5. In actual implementation, the base 6 can be configured as a rectangular steel plate with a thickness of 6mm, a length of 200mm, and a width of 100mm.
[0045] In some alternative embodiments, the seal 2 is configured as a sealing strip.
[0046] In this embodiment, the sealing strip has a certain degree of flexibility. Even if the end face of the workpiece 5 being inspected is uneven, it can still provide a good seal when it comes into contact with the workpiece 5, making it highly applicable. In actual implementation, the thickness of the sealing adhesive is configured to be 10mm.
[0047] As mentioned above, apart from the first mating surface and the second mating surface, the other parts of the seal 2 can have any structure as long as they do not cover the weld. For ease of implementation and to save manufacturing costs, in some optional embodiments, the sealing strip is constructed as a cuboid, that is, the first mating surface and the second mating surface are located on one side of the sealing strip, which is coplanar with the second working surface.
[0048] In some optional embodiments, the bracket 3 is provided with a slot, through which the bracket 3 and the workpiece 5 under test are engaged. This engagement method provides good operational convenience and improves the efficiency of the leak test. In actual implementation, the bracket 3 can be configured as a steel plate with a thickness of 6mm, a length of 100mm, and a width of 50mm. The slot is formed by an inward notch from the wide side of the bracket 3. This notch is a right-angled trapezoid with a lower base length of 35mm, an upper base length of 10mm, and a right-angle leg length of 70mm. The lower base is the opening of the notch.
[0049] The bracket 3 and the workpiece 5 are relatively fixed by means of a slotted connection. High dimensional accuracy is required to avoid large gaps between the slot wall and the workpiece 5, which could lead to unstable fixing. However, increasing dimensional accuracy increases manufacturing costs. Therefore, in some optional embodiments, a clamping wedge 4 is also included. The clamping wedge 4 is used to clamp between the bracket 3 and the workpiece 5. That is, a certain gap is allowed between the slot wall and the workpiece 5; clamping the clamping wedge 4 into this gap achieves relative fixation between the bracket 3 and the workpiece 5. In actual implementation, the clamping wedge 4 can be a wooden block.
[0050] In some optional embodiments, the length of the second working surface is configured to be not less than 100 mm. The total length of the weld is not a fixed value. During the inspection process from one end of the weld to the other, the length to be inspected at the other end of the weld is not fixed. Therefore, the contact length between the vacuum hood and the second working surface is also not fixed. When the length at the other end of the weld is equal to the wall thickness of the vacuum hood, the second working surface needs a 100 mm allowance to form a sealed contact with the opening of the vacuum hood. In actual implementation, the extension 1 can be configured as a 6 mm thick steel plate.
[0051] In some alternative embodiments, in order to ensure the connection strength between the bracket 3 and the base 6, the bracket 3 is welded to the base 6; the number of brackets 3 can be configured to be two, with the two brackets 3 welded to both sides of the base 6 respectively.
[0052] In some alternative embodiments, the extension 1 is welded to the base 6 to ensure the connection strength between the extension 1 and the base 6.
[0053] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.
[0054] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0055] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A compensation fixture for detecting leaks in a vacuum hood at weld ends, characterized in that, include: The base (6) has a first working surface; Extension (1), the extension (1) is connected to the base (6), the extension (1) has a second working surface; A sealing element (2) is connected to the extension element (1) and is used to contact the end face of the workpiece (5) under inspection. The sealing element (2) has a first mating surface and a second mating surface that are flush with the second working surface. The first mating surface and the second mating surface are respectively used to fit the vacuum hood. The bracket (3) is connected to the base (6) and is used to form a fixed fit with the workpiece (5) being inspected; In the working state, when the base (6) contacts the workpiece (5) under inspection through the first working surface, the second working surface of the extension (1) is connected to the workpiece (5) under inspection through the sealing member (2) and is flush with the detection surface of the workpiece (5).
2. The compensation fixture for detecting leakage in a vacuum hood at the weld end according to claim 1, characterized in that, The first working surface is configured as a plane.
3. The compensation fixture for detecting leakage in a vacuum hood at weld ends according to claim 1, characterized in that, The seal (2) is configured as a sealing strip.
4. The compensation fixture for detecting leakage in a vacuum hood at the weld end according to claim 3, characterized in that, The sealing strip is constructed as a cuboid.
5. The compensation fixture for detecting leakage in a vacuum hood at the weld end according to claim 1, characterized in that, The bracket (3) is provided with a slot, and the bracket (3) is engaged with the workpiece (5) being inspected through the slot.
6. The compensation fixture for detecting leakage in a vacuum hood at weld ends according to claim 5, characterized in that, It also includes a clamping wedge (4), which is used to clamp between the bracket (3) and the workpiece (5) being inspected.
7. The compensation fixture for detecting leakage in a vacuum hood at weld ends according to claim 1, characterized in that, The length of the second working surface is configured to be no less than 100 mm.
8. The compensation fixture for detecting leakage in a vacuum hood at weld ends according to claim 1, characterized in that, The bracket (3) is welded to the base (6).
9. The compensation fixture for detecting leakage in a vacuum hood at the weld end according to claim 1, characterized in that, The extension (1) is welded to the base (6).
10. The compensation fixture for detecting leakage in a vacuum hood at the weld end according to claim 1, characterized in that, The number of the brackets (3) is configured to be two, with the two brackets (3) located on both sides of the base (6).