A welding fixture for manufacturing the wellhead of a nuclear waste storage well.

Abstract

This utility model discloses a welding fixture for manufacturing the wellhead of a nuclear waste storage well. It includes a base plate with mounting screws at its top. The connecting structure includes a first cylinder, a second cylinder, and a third cylinder, each with a first flange mounted on its outer side. A second fixing screw passes through the top of the second flange. This utility model uses a second flange mounted at the bottom of the first flange, with the first and second flanges engaging to sequentially assemble the cylinder and flange parts onto the fixture. Utilizing the positioning and limiting features on the fixture, and the stop on the flange's inner diameter, the spacing and parallelism of the flanges, the roundness of the cylinder, the coaxiality between cylinders, and the perpendicularity to surface A can be ensured. After assembly, the fixture is removed, and each weld is performed. The welds are then ground to meet non-destructive testing requirements, and the inner surface welds are ground smooth. This achieves the goal of facilitating stable assembly of the welding fixture for manufacturing the nuclear waste storage well head.

Description

Technical Field

[0001] This utility model relates to the field of manufacturing technology for the wellhead of nuclear waste storage wells, and in particular to a welding fixture for manufacturing the wellhead of nuclear waste storage wells. Background Technology

[0002] Nuclear waste generally refers to radioactive waste that is no longer needed after nuclear fuel production, processing, and use in nuclear reactors. It also specifically refers to the radioactive waste such as uranium-238 remaining after spent fuel from nuclear reactors has been reprocessed to recover usable nuclear materials such as plutonium-239. When storing nuclear waste, a nuclear waste storage well is required. A nuclear waste storage well is an underground facility used to store radioactive waste generated in nuclear power plants, nuclear fuel cycles, and scientific research activities. Its core function is to safely isolate nuclear waste and prevent radioactive materials from leaking into the environment. The manufacture of a nuclear waste storage well opening requires a nuclear waste storage well opening manufacturing and welding fixture.

[0003] The current manufacturing and welding fixtures for nuclear waste storage wellheads can basically meet people's needs, but there are still some problems, as follows: when connecting the cylinder, the connection is not stable enough, and installation and assembly cannot be carried out quickly. Utility Model Content

[0004] The purpose of this invention is to provide a welding fixture for manufacturing the wellhead of a nuclear waste storage well, in order to solve the problem that existing welding fixtures for manufacturing the wellhead of nuclear waste storage wells are difficult to assemble stably.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a welding fixture for manufacturing the wellhead of a nuclear waste storage well, including a base plate;

[0006] The top of the base plate is fitted with mounting screws, the top of the base plate is fitted with a third cylinder, and the top of the third cylinder is fitted with a second cylinder.

[0007] The top of the second cylinder is the first cylinder, and the interiors of the first cylinder, the second cylinder and the third cylinder are provided with cavities. The outer sides of the first cylinder, the second cylinder and the third cylinder are all equipped with connecting structures.

[0008] The connection structure includes a first flange installed on the outer side of the first cylinder, the second cylinder, and the third cylinder. A second flange is installed at the bottom end of the first flange, and a second fixing screw passes through the top end of the second flange.

[0009] In use, first assemble the cylinder and flange parts onto the fixture in sequence. By using the positioning and limiting functions on the fixture and the stop on the inner diameter of the flange, the spacing and parallelism of each flange, the roundness of the cylinder, the coaxiality between cylinders, and the perpendicularity to surface A can be guaranteed. After assembly, remove the fixture and weld each weld. After completion, grind the weld to meet the requirements of non-destructive testing, and grind the inner surface weld smooth.

[0010] Furthermore, the first, second, and third cylinders are equipped with a support structure inside. The support structure includes a fixing block inside each of the first, second, and third cylinders, and a support ring is installed on the inner side of the fixing block. The support ring has a groove inside, and the support structure can support the cylinder.

[0011] Furthermore, a positioning structure is installed at the top of the base plate. The positioning structure includes a first positioning block installed at the top of the base plate, and a second positioning block provided on one side of the first positioning block. Both ends of the first and second positioning blocks are equipped with connecting plates, and a first fixing screw passes through one side of the connecting plate. The positioning structure can position and install the third cylinder.

[0012] Furthermore, a first nut is installed on one side of the first fixing screw. The first nuts are symmetrically distributed about the central axis of the first positioning block. The first fixing screw and the first nut can fix the first positioning block and the second positioning block together.

[0013] Furthermore, the outer side wall of the first fixing screw is uniformly provided with external threads, and the inner side wall of the first nut is uniformly provided with internal threads that cooperate with the external threads. The first fixing screw and the first nut are threadedly connected, and the first nut can be tightened onto the first fixing screw.

[0014] Furthermore, the bottom end of the first flange is provided with a locking block, and the top end of the second flange is provided with a locking groove. The first flange and the second flange form a locking structure, which facilitates disassembly.

[0015] Furthermore, a second nut is installed on the top of the second fixing screw, and the second nuts are arranged at equal intervals on the top of the first flange. The second nuts can be tightened onto the second fixing screw.

[0016] The advantages of the manufacturing and welding fixture for the wellhead of the nuclear waste storage well provided by this utility model are: when in use, multiple cylinders can be connected and fixed together through the connecting structure, which facilitates the assembly of multiple cylinders; the cylinders can be stably installed through the positioning structure; and the cylinders can be supported through the support structure.

[0017] A second flange is installed at the bottom of the first flange. The first and second flanges cooperate with each other to form a snap-fit ​​structure. The first and second flanges can be installed in the gap between the first, second, and third cylinders to fix the cylinders together. The second fixing screw and the second nut form a threaded connection. The first and second flanges can be fixed together by tightening the second fixing screw and the second nut. The cylinders and flange parts are assembled on the tooling in sequence. The positioning and limiting on the tooling and the stop on the inner diameter of the flanges can ensure the spacing and parallelism of each flange, the roundness of the cylinder, the coaxiality between the cylinders, and the perpendicularity to surface A. After assembly, the tooling is removed, and each weld is welded. After completion, the welds are ground to meet the requirements of non-destructive testing, and the inner surface welds are ground smooth. This achieves the purpose of making the welding tooling for the nuclear waste storage wellhead easy to assemble stably.

[0018] By setting fixed blocks inside the first, second, and third cylinders, the support ring can be fixed inside the fixed blocks. Both the support ring and the fixed blocks are annular, and the inner side of the support ring is provided with a groove. The support ring can support the first, second, and third cylinders and prevent the cylinders from sinking. This achieves the purpose of making the manufacturing and welding fixtures for the nuclear waste storage wellhead easy to support the cylinders. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional exploded structural diagram of the present invention;

[0021] Figure 3 This is a partial three-dimensional structural diagram of the connection structure of this utility model;

[0022] Figure 4 This is a partial three-dimensional structural diagram of the positioning structure of this utility model;

[0023] Figure 5 This is a partial three-dimensional structural diagram of the support structure of this utility model.

[0024] The reference numerals in the figure are as follows: 1. First cylinder; 2. Second cylinder; 3. Third cylinder; 4. Base plate; 5. Mounting screw; 6. Positioning structure; 601. First positioning block; 602. Second positioning block; 603. Connecting plate; 604. First fixing screw; 605. First nut; 7. Connecting structure; 701. First flange; 702. Second flange; 703. Second fixing screw; 704. Second nut; 8. Support structure; 801. Fixing block; 802. Support ring; 803. Groove; 9. Cavity. Detailed Implementation

[0025] 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 protection scope of the present utility model.

[0026] Please see Figures 1-5 One embodiment of this utility model is a welding fixture for manufacturing the wellhead of a nuclear waste storage well, including a base plate 4.

[0027] A mounting screw 5 is installed at the top of the base plate 4, and a positioning structure 6 is installed at the top of the base plate 4. The positioning structure 6 includes a first positioning block 601 installed at the top of the base plate 4, and a second positioning block 602 is provided on one side of the first positioning block 601. A connecting plate 603 is installed at both ends of the first positioning block 601 and the second positioning block 602, and a first fixing screw 604 passes through one side of the connecting plate 603. External threads are evenly provided on the outer side wall of the first fixing screw 604, and internal threads that cooperate with the external threads are evenly provided on the inner side wall of the first nut 605. The first fixing screw 604 and the first nut 605 are threadedly connected.

[0028] A first nut 605 is installed on one side of the first fixing screw 604, and the first nuts 605 are symmetrically distributed about the central axis of the first positioning block 601.

[0029] See attached document Figure 1-2 and attached Figure 4 As shown, the fixing screw can pass through the connecting plates 603 at both ends of the first positioning block 601 and the second positioning block 602. The first fixing screw 604 and the first nut 605 form a threaded connection, which can fix the first positioning block 601 and the second positioning block 602 together. The third cylinder 3 can be stuck inside the first positioning block 601 and the second positioning block 602. The third cylinder 3 can be fixed inside the positioning block. The bottom plate 4 on the outside of the positioning block and the mounting screw 5 form a threaded connection, which can fix the bottom plate 4.

[0030] A third cylinder 3 is installed at the top of the base plate 4, and a second cylinder 2 is installed at the top of the third cylinder 3.

[0031] The first cylinder 1 at the top of the second cylinder 2, the first cylinder 1, the second cylinder 2 and the third cylinder 3 are equipped with a support structure 8. The support structure 8 includes a fixing block 801 inside the first cylinder 1, the second cylinder 2 and the third cylinder 3, and a support ring 802 is installed on the inner side of the fixing block 801. The support ring 802 is provided with a groove 803 inside.

[0032] See attached document Figure 1-2 and attached Figure 5 As shown, the support ring 802 can be fixed inside the fixing block 801. Both the support ring 802 and the fixing block 801 are annular. At the same time, the inner side of the support ring 802 is provided with a groove 803. The support ring 802 can support the first cylinder 1, the second cylinder 2 and the third cylinder 3 to prevent the cylinder from sinking.

[0033] The first cylinder 1, the second cylinder 2, and the third cylinder 3 are provided with cavities 9 inside, and connecting structures 7 are installed on the outside of the first cylinder 1, the second cylinder 2, and the third cylinder 3.

[0034] The connecting structure 7 includes a first flange 701 installed on the outer side of the first cylinder 1, the second cylinder 2 and the third cylinder 3. The bottom end of the first flange 701 is provided with a locking block, and the top end of the second flange 702 is provided with a locking groove. The first flange 701 and the second flange 702 form a locking structure.

[0035] A second flange 702 is installed at the bottom of the first flange 701. A second fixing screw 703 passes through the top of the second flange 702. A second nut 704 is installed at the top of the second fixing screw 703. The second nuts 704 are arranged at equal intervals at the top of the first flange 701.

[0036] See attached document Figure 1-3 As shown, the first flange 701 and the second flange 702 cooperate with each other, forming a snap-fit ​​structure. The first flange 701 and the second flange 702 can be installed in the gap between the first cylinder 1, the second cylinder 2, and the third cylinder 3. The first flange 701 and the second flange 702 can fix the cylinders together. The second fixing screw 703 and the second nut 704 form a threaded connection. The first flange 701 and the second flange 702 can be fixed together by tightening the second fixing screw 703 and the second nut 704. The cylinders and flange parts are assembled on the tooling in sequence. By using the positioning and limiting on the tooling and the stop of the flange inner diameter, the spacing and parallelism of each flange, the roundness of the cylinder, the coaxiality between the cylinders, and the perpendicularity to surface A can be ensured. After assembly, the tooling is removed, and each weld is welded. After completion, the welds are ground to meet the requirements of non-destructive testing, and the inner surface welds are ground smooth.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding fixture for manufacturing the wellhead of a nuclear waste storage well, comprising a base plate (4); Its features are: The top of the base plate (4) is fitted with mounting screws (5), the top of the base plate (4) is fitted with a third cylinder (3), and the top of the third cylinder (3) is fitted with a second cylinder (2). The top of the second cylinder (2) is the first cylinder (1), and the interior of the first cylinder (1), the second cylinder (2) and the third cylinder (3) are provided with cavities (9), and the outer sides of the first cylinder (1), the second cylinder (2) and the third cylinder (3) are all equipped with connecting structures (7); The connection structure (7) includes a first flange (701) installed on the outer side of the first cylinder (1), the second cylinder (2) and the third cylinder (3), a second flange (702) installed at the bottom end of the first flange (701), and a second fixing screw (703) passing through the top end of the second flange (702).

2. The nuclear waste storage wellhead manufacturing and welding fixture of claim 1, wherein: The first cylinder (1), the second cylinder (2) and the third cylinder (3) are equipped with a support structure (8). The support structure (8) includes a fixing block (801) inside the first cylinder (1), the second cylinder (2) and the third cylinder (3), and a support ring (802) is installed on the inner side of the fixing block (801). The support ring (802) has a groove (803) inside.

3. The nuclear waste storage wellhead manufacturing and welding fixture of claim 1, wherein: A positioning structure (6) is installed at the top of the base plate (4). The positioning structure (6) includes a first positioning block (601) installed at the top of the base plate (4), and a second positioning block (602) provided on one side of the first positioning block (601). A connecting plate (603) is installed at both ends of the first positioning block (601) and the second positioning block (602), and a first fixing screw (604) passes through one side of the connecting plate (603).

4. The welding fixture for manufacturing the wellhead of a nuclear waste storage well according to claim 3, characterized in that: A first nut (605) is installed on one side of the first fixing screw (604), and the first nut (605) is symmetrically distributed about the central axis of the first positioning block (601).

5. A nuclear waste storage wellhead fabrication welding tooling as claimed in claim 4, wherein: The first fixing screw (604) has external threads evenly arranged on its outer side wall, and the first nut (605) has internal threads evenly arranged on its inner side wall that cooperate with the external threads. The first fixing screw (604) and the first nut (605) are threadedly connected.

6. The nuclear waste storage wellhead manufacturing and welding fixture of claim 1, wherein: The bottom end of the first flange (701) is provided with a locking block, and the top end of the second flange (702) is provided with a locking groove. The first flange (701) and the second flange (702) form a locking structure.

7. The nuclear waste storage wellhead manufacturing and welding fixture of claim 1, wherein: The second fixing screw (703) is fitted with a second nut (704) at its top end, and the second nuts (704) are arranged at equal intervals at the top end of the first flange (701).

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