Application in the manufacturing process and production equipment of U-shaped tubes for nuclear power plant steam emitters

Abstract

This invention relates to the manufacturing process and equipment for U-shaped tubes used in nuclear power steam emitters, belonging to the field of U-shaped tube manufacturing technology. It addresses the challenges of existing U-shaped tube forming processes, requiring precision molding and ensuring corrosion resistance and high-temperature performance during use. The invention utilizes a U-shaped angle-fixed mold, allowing for the detachable shaping block assembly through the coordinated arrangement of the rotating frame, fixed clamp, and clamping adjustment components. The pressure forming mechanism and side support mechanism work together to allow for replacement of the side support mechanism by removing replaceable half-rings before U-shaped tube extrusion molding. During U-shaped tube extrusion molding, the tube support gradually changes its angle as the pressing assembly rises and falls. Simultaneously, the highly conforming tube support prevents deformation of both ends of the U-shaped tube. The tube body is made of heat-resistant steel with good corrosion resistance and high-temperature performance. This invention changes the U-shaped tube injection molding production process to a method where the tube is first manufactured and then mechanically bent.

Description

Technical Field

[0001] This invention relates to the field of U-tube manufacturing technology, and particularly to the manufacturing process and equipment for U-tubes used in nuclear power steam emitters. Background Technology

[0002] U-tubes used in nuclear power plant steam emitters are key components for generating steam in nuclear power plants. Their function is to heat the coolant to a high temperature and high pressure state to provide power for the nuclear reactor. The U-tube plays a very important role in nuclear power plants, and its performance directly affects the safe and stable operation of the nuclear power plant. During the operation of a nuclear power plant, the U-tube faces the challenges of high temperature, high pressure, high flow rate coolant and gas-liquid two-phase flow. Therefore, it needs to have excellent mechanical properties, corrosion resistance and high temperature performance. In addition, the manufacturing process and quality of the U-tube also directly affect its service life and safety in the nuclear power plant.

[0003] A mold for injection molding of U-shaped pipe fittings, disclosed in CN109049545B, includes a sliding seat movable along the mold closing direction of the moving mold, a demolding plate that can move toward the movable core from a mold-locking position and a demolding position, and a telescopic device for driving the demolding plate. The core mold includes a pair of movable cores and a pair of fixed cores. When the ejector plate moves from the locking position to the ejection position, the ejector plate presses the end face of the formed U-shaped bend, causing the U-shaped bend to separate from the movable cores and the fixed cores. In this invention, the U-shaped bend is pushed out of the core mold by the ejector plate, and automatic demolding can be completed without the need for ejector pins, making the surface of the U-shaped bend more aesthetically pleasing without ejector marks. However, this U-shaped tube is directly formed by injection molding, and the pipe opening needs to be drilled subsequently, which makes the U-shaped tube difficult to form and requires a change in the U-shaped tube production process. At the same time, the U-shaped tube used in nuclear power steam emitters is a key component for generating steam in nuclear power plants, which needs to be precisely formed to ensure its corrosion resistance and high-temperature performance during use.

[0004] To address the aforementioned issues, a process and production equipment for manufacturing U-shaped tubes used in nuclear power plant steam emitters are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a manufacturing process and equipment for U-shaped tubes used in nuclear power plant steam emitters. This invention solves the problem that existing U-shaped tubes are directly formed by injection molding, and the pipe openings need to be drilled subsequently, which makes it difficult to form U-shaped tubes and requires a change in the U-shaped tube manufacturing process. At the same time, U-shaped tubes used in nuclear power plant steam emitters are key components for generating steam in nuclear power plants, and they need to be precisely formed to ensure their corrosion resistance and high-temperature performance during use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A U-shaped tube production equipment for nuclear power steam emitters, comprising a support mechanism, wherein a U-shaped angle fixing mold for angle shaping is fixedly installed inside the support mechanism; a pressure forming mechanism for pressure forming is connected to the upper end of the support mechanism; side support mechanisms are sleeved at both ends of the pressure forming mechanism; the U-shaped angle fixing mold includes a ring frame fixed to one side of the support mechanism, a fixed clamping frame connected to the upper end of the ring frame, and a clamping adjustment assembly movably connected to one side of the fixed clamping frame; a shaping block assembly is engaged between the fixed clamping frame and the clamping adjustment assembly; a rotating frame is movably connected to one side of the fixed clamping frame; the pressure forming mechanism includes a liftable pressing assembly; the side support mechanism includes sleeves sleeved on both sides of the pressing assembly, threaded caps of the threaded sleeves, replaceable half-rings movably sleeved on the sleeves, and a tube support fixed to one side of the replaceable half-rings.

[0007] Furthermore, the support mechanism includes a base plate, side supports fixedly mounted on both sides of the base plate, and a pressure frame pressed against the upper end of the side supports.

[0008] Furthermore, the clamping and adjusting assembly includes a motor disposed on one side of the connecting ring frame, a screw disposed at the output end of the motor, and a movable clamp disposed on the screw threadedly connected to the screw.

[0009] Furthermore, a locking block is connected to one side of the movable clamp and the fixed clamp, and the shaping block assembly includes a locking block that clamps between the fixed clamp and the movable clamp.

[0010] Furthermore, the shaping block assembly also includes a semi-circular block fixedly disposed on the upper end of the locking block, and the upper end of the semi-circular block is provided with a circular groove.

[0011] Furthermore, the pressure forming mechanism includes a cylinder connected to the upper end of the pressure frame, the pressing component is located at the output end of the cylinder, the pressing component has limit grooves at both ends, and the lower ends of the pressing component are connected to side connecting frames.

[0012] Furthermore, the pressure forming mechanism also includes guide supports arranged on both sides of the screw-connected ring frame. The upper end of the guide support is in contact with the pressure frame. A guide engagement frame is engaged on one side of the guide support. The guide support and the guide engagement frame are arranged in two sets that are mirror-symmetrical about the ring frame.

[0013] Furthermore, the socket includes a cylindrical rod at one end of the insertion side connecting bracket, with a rotating cap and a threaded joint connected to both ends of the cylindrical rod, and a positioning groove is provided on the cylindrical rod.

[0014] Furthermore, the replaceable half-ring is provided with two sets of rotatable connections, and the tube support is connected to one set of replaceable half-rings. The replaceable half-ring includes a semi-circular ring that covers the cylindrical rod and a positioning ring that engages with the positioning groove. Two sets of nut blocks are connected to one side of the semi-circular ring.

[0015] The present invention proposes a technical solution: providing a manufacturing process for U-shaped tubes used in nuclear power plant steam emitters, comprising the following steps:

[0016] S1: Raw material preparation: The production equipment first needs to prepare the raw materials. For U-tubes used in nuclear power steam emitters, heat-resistant steel materials with excellent mechanical properties, corrosion resistance and high temperature performance should be selected. They have good oxidation resistance, creep and durability under high temperature and high pressure environments.

[0017] S2: Pipe cutting; Cut the pipe according to its size and shape, ensuring dimensional accuracy and surface quality during the cutting process;

[0018] S3: Pipe welding; The cut pipes are welded using welding methods such as gas shielded arc welding and submerged arc welding, which effectively reduces the stress and deformation generated during the welding process and ensures the size and shape accuracy of the U-shaped pipe;

[0019] S4: Pipe bending; The welded pipes are bent using U-shaped tube production equipment used in nuclear power steam emitters. The combination of U-shaped angle fixing mold and side support mechanism can ensure the shape and dimensional accuracy of the U-shaped tube.

[0020] S5: Inner and outer surface treatment; The bent U-shaped tube is treated with inner and outer surfaces in sequence according to the steps of cleaning, rust removal, oxidation removal and coating. The coating is a high temperature resistant and corrosion resistant alloy coating to prevent further oxidation and corrosion of the surface.

[0021] S6: Inspection and Measurement; Inspect the size, shape, and surface quality of the U-tubes; Use non-destructive testing methods to detect defects in the U-tubes; Use infrared thermography to monitor the temperature of the U-tubes to ensure that the products meet design requirements;

[0022] S7: Assembly and debugging; Assemble the U-tube onto the steam emitter and debug it to ensure that the steam emitter can operate normally.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The present invention provides a process and production equipment for manufacturing U-shaped tubes for nuclear power steam emitters. By setting a U-shaped angle fixed mold, the ring frame and the fixed clamp are connected to each other. The clamping adjustment component can move and cooperate with the fixed clamp to fix and clamp the two sides of the shaping block component. The rotating frame can rotate to block both ends of the shaping block component. The cooperative arrangement of the rotating frame, the fixed clamp, and the clamping adjustment component makes the shaping block component detachable. The shaping block component can be set with various models to meet the needs of U-shaped tube bending of different radii, meet the needs of precision forming of U-shaped tubes, and solve the problem that the existing U-shaped tubes for nuclear power steam emitters are key components used to generate steam in nuclear power plants and require precision forming.

[0025] 2. The U-shaped tube manufacturing process and production equipment for nuclear power steam emitters provided by this invention, through the coordinated arrangement of a pressure forming mechanism and a side support mechanism, allows the lifting and lowering of the pressing assembly to drive the vertical lifting and lowering of the side support mechanisms on both sides. The sleeve and the threaded cap are threadedly connected to each other and sleeved on the pressing assembly. The replaceable half-ring is aligned and positioned with the sleeve, and the tube support fits against both sides of the U-shaped tube. This structure allows the side support mechanism to be replaced by disassembling the replaceable half-ring before the U-shaped tube is extruded. During the U-shaped tube extrusion forming, the tube support gradually changes its angle with the lifting and lowering of the pressing assembly. At the same time, the tube support with high fit can also prevent the ends of the U-shaped tube from being squeezed and deformed. This solves the problem that existing U-shaped tubes are directly formed by injection molding, and the pipe opening needs to be drilled later, which makes U-shaped tube forming difficult and requires changes to the U-shaped tube production process.

[0026] 3. The U-shaped tube manufacturing process and production equipment provided by this invention for use in nuclear power steam emitters are made of heat-resistant steel with good corrosion resistance and high-temperature performance. The production process of U-shaped tube injection molding is changed to the form of tube material production followed by mechanical bending, which solves the problem of ensuring the corrosion resistance and high-temperature performance of existing U-shaped tubes for nuclear power steam emitters. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall front view of the present invention;

[0029] Figure 3 This is a schematic diagram of the overall side view structure of the present invention;

[0030] Figure 4 For the present invention Figure 2 A schematic diagram of the structure at point A;

[0031] Figure 5 This is a schematic diagram showing the disassembled structure of the pressure molding mechanism of the present invention;

[0032] Figure 6 This is a schematic diagram showing the disassembled structure of the pressure forming mechanism and the side support mechanism of the present invention;

[0033] Figure 7 This is a schematic diagram of the disassembled structure of the replaceable half-ring and tube support of the present invention.

[0034] In the diagram: 1. Support mechanism; 11. Base plate; 12. Side support frame; 13. Press frame; 2. U-shaped angle fixing mold; 21. Ring frame; 22. Fixed clamp frame; 23. Clamping adjustment assembly; 231. Motor; 232. Screw; 233. Movable clamp frame; 2331. Locking block; 24. Rotating frame; 25. Shaping block assembly; 251. Locking block; 252. Semicircular block; 2521. Circular groove; 3. Pressure forming mechanism 31. Cylinder; 32. Pressing assembly; 321. Limiting groove; 322. Side connecting frame; 33. Guide support frame; 34. Guide clamping frame; 4. Side support mechanism; 41. Sleeve; 411. Rotary cap; 412. Cylindrical rod; 413. Positioning groove; 414. Threaded joint; 42. Threaded cap; 43. Replaceable half-ring; 431. Semi-circular ring; 432. Positioning ring; 433. Nut block; 44. Pipe support. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In order to solve existing technical problems, such as Figures 1-7 As shown, the following preferred technical solutions are provided:

[0037] A U-shaped tube production equipment for nuclear power steam emitters includes a support mechanism 1. A U-shaped angle fixing mold 2 for angle shaping is fixedly installed inside the support mechanism 1. A pressure forming mechanism 3 for pressure forming is connected to the upper end of the support mechanism 1. Side support mechanisms 4 are sleeved at both ends of the pressure forming mechanism 3. The U-shaped angle fixing mold 2 includes a ring frame 21 fixed to one side of the support mechanism 1, a fixed clamp 22 connected to the upper end of the ring frame 21, and a clamping adjustment assembly 23 movably transferred to one side of the fixed clamp 22. A shaping block assembly 25 is engaged between the fixed clamp 22 and the clamping adjustment assembly 23. A rotating frame 24 is transferred to one side of the fixed clamp 22. The pressure forming mechanism 3 includes a liftable pressing assembly 32. The side support mechanism 4 includes sleeves 41 sleeved on both sides of the pressing assembly 32, a threaded cap 42 of the threaded sleeve 41, a replaceable half-ring 43 movably sleeved on the sleeve 41, and a tube support 44 fixed to one side of the replaceable half-ring 43.

[0038] Specifically, the ring frame 21 and the fixed clamp 22 are interconnected. The clamping adjustment component 23 can move and cooperate with the fixed clamp 22 to fix and clamp the two sides of the shaping block component 25. The rotating frame 24 can rotate to block both ends of the shaping block component 25. The cooperative arrangement of the rotating frame 24, the fixed clamp 22 and the clamping adjustment component 23 makes the shaping block component 25 detachable. The shaping block component 25 can be provided in various models to meet the needs of U-shaped tube bending of different radii and to meet the needs of precision forming of U-shaped tubes. The lifting and lowering of the pressing component 32 drives the side support mechanism 4 on both sides to lift vertically. The socket 41 and the threaded cap 42 are screwed together. The U-shaped tube is connected by a threaded joint and fitted onto the pressing assembly 32. The replaceable half-ring 43 is aligned with the sleeve 41 for positioning and fitting. The tube support 44 fits against both sides of the U-shaped tube. This structure allows the side support mechanism 4 to be replaced by disassembling the replaceable half-ring 43 before the U-shaped tube is extruded. During the extrusion molding of the U-shaped tube, the tube support 44 gradually changes its angle as the pressing assembly 32 is raised and lowered. At the same time, the tube support 44, which has a high fit, can also prevent the ends of the U-shaped tube from being squeezed and deformed. The tube body is made of heat-resistant steel with good corrosion resistance and high temperature performance. The production process of U-shaped tube injection molding is changed to the form of tube material production first and then mechanical bending.

[0039] The present invention will be further described below with reference to embodiments.

[0040] Example 1:

[0041] Combination Figures 2-4 The support mechanism 1 includes a base plate 11, side supports 12 fixedly installed on both sides of the base plate 11, and a pressure frame 13 pressed onto the upper end of the side supports 12. The base plate 11, the two sets of side supports 12 and the pressure frame 13 constitute the support frame.

[0042] The clamping and adjusting assembly 23 includes a motor 231 connected to one side of the connecting ring frame 21, a screw 232 located at the output end of the motor 231, and a movable clamp 233 threadedly connected to the screw 232. The motor 231 drives the screw 232 to rotate, thereby causing the movable clamp 233 to move horizontally and adjust the gap between the movable clamp 233 and the fixed clamp 22, which facilitates the disassembly of the shaping block assembly 25.

[0043] A locking block 2331 is connected to one side of the movable clamp 233 and the fixed clamp 22. The shaping block assembly 25 includes a locking block 251 that clamps and is disposed between the fixed clamp 22 and the movable clamp 233. The locking block 2331 and the locking block 251 are mutually matched in shape to achieve positioning and fixing of the shaping block assembly 25.

[0044] The shaping block assembly 25 also includes a semi-circular block 252 fixedly disposed on the upper end of the locking block 251. A circular groove 2521 is provided on the upper end of the semi-circular block 252. The semi-circular block 252 is set as a semi-circle to fit the internal setting of the U-shaped tube. The shaping block assembly 25 is replaceable, and the shape of the circular groove 2521 of different shaping block assemblies 25 can be varied.

[0045] Example 2:

[0046] Combination Figures 5-7 The pressure forming mechanism 3 includes a cylinder 31 connected to the upper end of the pressure frame 13, a pressing component 32 located at the output end of the cylinder 31, limit grooves 321 opened at both ends of the pressing component 32, and side connecting frames 322 connected to the lower ends of the pressing component 32. The cylinder 31 drives the pressing component 32 to rise and fall, the pressure frame 13 fixes the cylinder 31, the limit grooves 321 realize the lifting, positioning and locking, and the side connecting frame 322 is connected to the side support mechanism 4.

[0047] The pressure forming mechanism 3 also includes guide supports 33 arranged on both sides of the screw-connected ring frame 21. The upper end of the guide support 33 is in contact with the pressure frame 13. A guide engagement frame 34 is engaged on one side of the guide support 33. The guide support 33 and the guide engagement frame 34 are arranged in two sets that are mirror-symmetrical about the ring frame 21. The guide support 33 and the side support 12 work together to support the pressure frame 13. The guide support 33 provides an engagement track for the guide engagement frame 34. The guide engagement frame 34 is engaged with the limiting groove 321.

[0048] The socket 41 includes a cylindrical rod 412 provided at one end of the insertion side connecting frame 322. The two ends of the cylindrical rod 412 are respectively connected to a rotating cap 411 and a threaded connector 414. A positioning groove 413 is provided on the cylindrical rod 412. The cylindrical rod 412 passes through the insertion side connecting frame 322. The rotating cap 411 is provided on one side. The positioning groove 413 positions the replaceable half ring 43. The threaded connector 414 is threadedly connected to the threaded cap 42 to realize the socket 41 and the threaded cap 42 to the pressing assembly 32 for socket fixing.

[0049] The replaceable half-ring 43 is provided with two sets of rotatable connections. The tube support 44 is connected to one set of replaceable half-rings 43. The replaceable half-ring 43 includes a semi-circular ring 431 that covers the cylindrical rod 412 and a positioning ring 432 that engages with the positioning groove 413. Two sets of nut blocks 433 are connected to one side of the semi-circular ring 431. The semi-circular ring 431 and the positioning ring 432 are provided so that the sleeve 41 can be positioned and movably sleeved with it. Nuts are inserted into the nut blocks 433 to connect the two sets of replaceable half-rings 43.

[0050] To further explain the above embodiments, the present invention also includes an embodiment applied to the manufacturing process of U-shaped tubes for nuclear power plant steam emitters, comprising the following steps:

[0051] Step 1: Raw material preparation: The production equipment first needs to prepare the raw materials. For U-tubes used in nuclear power steam emitters, heat-resistant steel materials with excellent mechanical properties, corrosion resistance and high temperature performance should be selected. They have good oxidation resistance, creep and durability under high temperature and high pressure environments.

[0052] Step 2: Pipe cutting; Cut the pipe according to its size and shape, ensuring dimensional accuracy and surface quality during the cutting process;

[0053] Step 3: Pipe welding; The cut pipes are welded using methods such as gas shielded arc welding and submerged arc welding, which effectively reduces stress and deformation during the welding process and ensures the dimensional and shape accuracy of the U-shaped pipe.

[0054] Step 4: Pipe bending; The welded pipes are bent using U-shaped tube production equipment used in nuclear power steam emitters. The combination of U-shaped angle fixing mold 2 and side support mechanism 4 can ensure the shape and dimensional accuracy of the U-shaped tube.

[0055] Step 5: Inner and outer surface treatment; The bent U-shaped tube is treated with inner and outer surfaces in the following steps: cleaning, rust removal, oxidation removal, and coating. The coating is a high-temperature resistant and corrosion-resistant alloy coating to prevent further oxidation and corrosion of the surface.

[0056] Step Six: Inspection and Measurement; Inspect the U-tube for dimensions, shape, and surface quality; Use non-destructive testing methods to detect defects in the U-tube; Use infrared thermography to monitor the temperature of the U-tube to ensure that the product meets design requirements;

[0057] Step 7: Assembly and debugging; Assemble the U-tube onto the steam emitter and debug it to ensure that the steam emitter can operate normally.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A production equipment for U-shaped tubes used in nuclear power plant steam emitters, comprising a support mechanism (1), characterized in that, The support mechanism (1) is internally fixed with a U-shaped angle fixing mold (2) for angle shaping. The upper end of the support mechanism (1) is connected to a pressure forming mechanism (3) for pressure forming. The two ends of the pressure forming mechanism (3) are sleeved with side support mechanisms (4). The U-shaped angle fixing mold (2) includes a connecting ring frame (21) fixed on one side of the support mechanism (1), a fixed clamp (22) provided on the upper end of the connecting ring frame (21), and a clamping adjustment component (23) movably connected to one side of the fixed clamp (22). A shaping block component (25) is engaged between the fixed clamp (22) and the clamping adjustment component (23). A rotating frame (24) is connected to one side of the fixed clamp (22). The pressure forming mechanism (3) includes a lifting pressing component (32). The side support mechanism (4) includes a sleeve (41) provided on both sides of the pressing component (32), a threaded cap (42) of the threaded connecting sleeve (41), a replaceable half-ring (43) of the movable sleeve (41), and a tube support (44) fixed on one side of the replaceable half-ring (43).

2. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 1, characterized in that: The support mechanism (1) includes a base plate (11), side supports (12) fixedly installed on both sides of the base plate (11), and a pressure frame (13) pressed onto the upper end of the side supports (12).

3. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 2, characterized in that: The clamping adjustment assembly (23) includes a motor (231) provided on one side of the connecting ring frame (21), a screw (232) provided at the output end of the motor (231), and a movable clamp (233) provided by threaded connection to the screw (232).

4. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 3, characterized in that: The movable clamp (233) and the fixed clamp (22) are connected to a locking block (2331) on one side, and the shaping block assembly (25) includes a locking block (251) that clamps between the fixed clamp (22) and the movable clamp (233).

5. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 4, characterized in that: The shaping block assembly (25) also includes a semi-circular block (252) fixedly disposed on the upper end of the locking block (251), and the upper end of the semi-circular block (252) is provided with a circular groove (2521).

6. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 5, characterized in that: The pressure forming mechanism (3) includes a cylinder (31) connected to the upper end of the pressure frame (13), the pressing component (32) is located at the output end of the cylinder (31), the two ends of the pressing component (32) are provided with limit grooves (321), and the lower ends of the pressing component (32) are connected to side connecting frames (322).

7. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 6, characterized in that: The pressure forming mechanism (3) also includes guide supports (33) provided on both sides of the connecting ring frame (21). The upper end of the guide support (33) is in contact with the pressure frame (13). A guide locking frame (34) is provided on one side of the guide support (33). The guide support (33) and the guide locking frame (34) are provided in two sets that are mirror-symmetrical about the ring frame (21).

8. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 7, characterized in that: The socket (41) includes a cylindrical rod (412) provided at one end of the insertion side connecting bracket (322), and the two ends of the cylindrical rod (412) are respectively connected to a rotating cap (411) and a threaded joint (414), and a positioning groove (413) is provided on the cylindrical rod (412).

9. The equipment for producing U-shaped tubes for nuclear power steam emitters as described in claim 8, characterized in that: The replaceable half ring (43) is provided with two sets of rotatable connections. The tube support (44) is connected to a set of replaceable half rings (43). The replaceable half ring (43) includes a semi-circular ring (431) covering the cylindrical rod (412) and a positioning ring (432) engaging the positioning groove (413). Two sets of nut blocks (433) are connected to one side of the semi-circular ring (431).

10. A process for preparing U-shaped tubes for nuclear power steam emitters using the equipment described in claim 9, characterized in that, Includes the following steps: S1: Raw material preparation: The production equipment first needs to prepare raw materials. The U-shaped tubes used in nuclear power steam emitters are made of heat-resistant steel with excellent mechanical properties, corrosion resistance and high temperature performance. It has good oxidation resistance, creep and durability under high temperature and high pressure environment. S2: Pipe cutting; Cut the pipe according to its size and shape, ensuring dimensional accuracy and surface quality during the cutting process; S3: Pipe welding; The cut pipes are welded using gas shielded electric arc welding or submerged arc welding, which effectively reduces the stress and deformation generated during the welding process and ensures the size and shape accuracy of the U-shaped pipe. S4: Pipe bending; The welded pipe is bent using U-shaped tube production equipment used in nuclear power steam launchers. The combination of U-shaped angle fixing mold (2) and side support mechanism (4) can ensure the shape and size accuracy of the U-shaped tube. S5: Inner and outer surface treatment; The bent U-shaped tube is treated with inner and outer surfaces in sequence according to the steps of cleaning, rust removal, oxidation removal and coating. The coating is a high temperature resistant and corrosion resistant alloy coating to prevent further oxidation and corrosion of the surface. S6: Inspection and Measurement; Inspect the size, shape and surface quality of the U-tubes; Use non-destructive testing methods to detect defects in the U-tubes; Use infrared thermography to monitor the temperature of the U-tubes to ensure that the products meet design requirements; S7: Assembly and debugging; Assemble the U-tube onto the steam emitter and perform debugging to ensure that the steam emitter can operate normally.

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