Heat treatment tooling and nuclear power plant maintenance equipment

Abstract

The utility model provides a kind of heat treatment frock and nuclear power plant overhaul equipment, wherein heat treatment frock includes: supporting plate, including arc section and multiple uncoiling parts sequentially spaced along the arc length direction of arc section, one end of uncoiling part is connected with arc section, the end of uncoiling part away from arc section is freely arranged, arc section is used to contact with the side of inner peripheral wall of flange, and uncoiling part is used to contact with the end surface of flange;Fixed plate is set to the side of end surface of uncoiling part away from flange, and the length direction of fixed plate extends along the circumference of flange;Fixed part connects uncoiling part and fixed plate;Wherein, fixed part can be fixed at different positions in the length direction of fixed plate, to adjust the gap between two adjacent uncoiling parts, so that the arc of arc section is adjustable to adapt to the flange of multiple radian. The adjustable design of fixed part enables frock to be quickly adjusted according to actual flange specification when used in the field, is easy to operate, and improves work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of nuclear power plant maintenance equipment, and more specifically, to a heat treatment tooling and nuclear power plant maintenance equipment. Background Technology

[0002] The emergency water system of a nuclear power plant's nuclear island uses seawater as the operating medium, making the carbon steel flanges in the system highly susceptible to seawater corrosion. Due to the large thickness of the flanges, according to specifications, preheating before welding, post-weld heating, and stress-relieving heat treatment are required during repair welding. Furthermore, the flanges on site are fixed to the pipelines, mostly distributed with the flange ends perpendicular to the ground. The repair welding locations are random and can occur anywhere on the flange. In addition, there are flanges of different specifications on site. Therefore, it is essential to design a local heat treatment device that can accommodate flanges of different specifications and various repair welding positions (including horizontal, vertical, and overhead welding).

[0003] Currently, when heat treatment is performed on irregularly shaped components such as flanges at the overhaul and maintenance site, special heat treatment tooling is usually custom-made for specific specifications.

[0004] The flange specifications and dimensions applicable to the dedicated heat treatment fixtures are fixed and cannot be adjusted. Each specification requires a custom-made set, resulting in high costs. In addition, it is difficult to adjust the fit between the heating element and the flange. Utility Model Content

[0005] The purpose of this utility model is to provide a heat treatment fixture and nuclear power plant maintenance equipment to solve the technical problem that the heat treatment of flange irregular components in the prior art uses a custom-made special heat treatment fixture, which has fixed applicable specifications and dimensions and cannot adjust the degree of fit to the flange.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] Firstly, a heat treatment fixture is provided, comprising:

[0008] The pallet includes an arc-shaped portion and a plurality of unfolded portions arranged at intervals along the arc length direction of the arc-shaped portion. One end of each unfolded portion is connected to the arc-shaped portion, and the other end of the unfolded portion away from the arc-shaped portion is freely disposed. The arc-shaped portion is used to contact one side of the inner peripheral wall of the flange, and the unfolded portion is used to contact the end face of the flange.

[0009] A fixing plate is disposed on the side of the unfolded portion opposite to the end face of the flange, and the length direction of the fixing plate extends along the circumference of the flange;

[0010] A fastener connects the unfolded portion to the fixed plate;

[0011] The fastener can be fixed at different positions along the length of the fixed plate to adjust the gap between two adjacent unfolded parts, so that the curvature of the arc-shaped part can be adjusted to adapt to flanges with various curvatures.

[0012] By adopting the above technical solution, and through the adjustable curvature of the arc section and the length of the support component, this tooling can adapt to flanges of various curvatures and diameters, breaking the limitation of traditional special tooling that can only be adapted to a single specification of flange. This reduces the cost and time of customizing tooling for flanges of different specifications, and improves the efficiency and economy of tooling use.

[0013] In one embodiment, the heat treatment fixture further includes a support member, one end of which is connected to the arcuate portion, and the other end of which is used to abut against the other side of the inner peripheral wall of the flange. The support member is used to push the arcuate portion to abut against one side of the inner peripheral wall of the flange.

[0014] In one embodiment, the plurality of unfolded portions are axially symmetrical, and there are two fasteners. One fastener is connected to one of the unfolded portions located on one side of the axis of symmetry, and the other fastener is connected to one of the unfolded portions located on the other side of the axis of symmetry. The positions of the two fasteners in the length direction of the fixing plate are adjustable, so that the gap between the two unfolded portions is adjustable.

[0015] In one embodiment, there are two fixing plates, which are located on opposite end faces of the flange. The fastener connects the two fixing plates, and the extended portion is located between one of the fixing plates and the end face of the flange.

[0016] In one embodiment, each of the unfolded portions is provided with a fixing hole, and one of the fixing members is inserted into the fixing hole of the unfolded portion.

[0017] In one embodiment, the fixing plate is provided with an arc-shaped groove extending circumferentially along the flange, and the fixing member includes a fixing screw and two fixing nuts connected to both ends of the fixing screw. The fixing screw passes through the arc-shaped groove and can move along the arc length direction of the arc-shaped groove, so that the gap of the unfolded part is adjustable. The gap of the unfolded part is fixed when the fixing nuts are locked to the fixing screw.

[0018] Alternatively, the fixing plate may have a plurality of threaded holes spaced apart along the circumference of the flange, and the fixing member may include a fixing screw and two fixing nuts connected to both ends of the fixing screw. The fixing screw may be selectively inserted into the threaded hole, so that the gap of the unfolded part is adjustable.

[0019] In one embodiment, the support includes a first rod and a second rod threadedly connected to the first rod. The first rod is connected to the arcuate portion, and the second rod is used to abut against the other side of the inner circumferential wall of the flange. When the second rod rotates relative to the first rod, the distance between them is adjustable, making the length of the support adjustable.

[0020] In one embodiment, the second rod body is provided with a support base that abuts against the flange, the support base is provided with an arc-shaped surface that abuts against the flange, and a locking buckle is movably connected between the support base and the flange.

[0021] In one embodiment, the number of the support members is two, the two support members are arranged in parallel and spaced apart, and the support members are arranged radially parallel to the flange.

[0022] Secondly, a nuclear power plant maintenance equipment is provided, including a main body of the nuclear power plant maintenance equipment and the aforementioned heat treatment fixture, wherein the heat treatment fixture is used in conjunction with the main body of the nuclear power plant maintenance equipment.

[0023] By adopting the above technical solutions, the maintenance function system has been improved, maintenance efficiency has been enhanced, equipment versatility and economy have been increased, and maintenance quality and equipment reliability have been guaranteed. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the heat treatment fixture provided in this embodiment of the utility model.

[0026] Figure 2 This is a bottom view of the heat treatment fixture provided in this embodiment of the utility model.

[0027] Figure 3 This is a front view of the heat treatment fixture provided in this embodiment of the utility model.

[0028] The labels for the attached figures are as follows:

[0029] 100. Heat treatment fixtures;

[0030] 1. Fixing plate; 2. Support plate; 3. Fastener; 4. Supporting component; 5. Flange; 6. Heating element

[0031] 11. Arc-shaped groove; 21. Arc-shaped part; 22. Expanded part; 31. Fixing screw; 32. Fixing nut; 41. First rod body; 42. Second rod body; 43. Support base; 44. Locking buckle; 51. Inner peripheral wall; 52. End face;

[0032] 221. Fixing hole; 431. Curved surface;

[0033] X, the length direction. Detailed Implementation

[0034] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly on or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component.

[0036] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or the number of technical features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. The specific implementation of this utility model is described in more detail below with reference to specific embodiments:

[0038] like Figures 1 to 3 As shown, an embodiment of this utility model provides a heat treatment fixture 100, comprising:

[0039] The pallet 2 includes an arc-shaped portion 21 and a plurality of unfolded portions 22 arranged sequentially at intervals along the arc length direction of the arc-shaped portion 21. One end of the unfolded portion 22 is connected to the arc-shaped portion 21, and the end of the unfolded portion 22 away from the arc-shaped portion 21 is freely disposed. The arc-shaped portion 21 is used to contact one side of the inner peripheral wall 51 of the flange 5, and the unfolded portion 22 is used to contact the end face of the flange 5.

[0040] The fixing plate 1 is disposed on the side of the unfolded part 22 away from the end face of the flange 5, and the length direction X of the fixing plate 1 extends along the circumference of the flange 5.

[0041] Fixing component 3 connects the unfolding part 22 and the fixing plate 1;

[0042] The fastener 3 can be fixed at different positions along the length X of the fixing plate 1 to adjust the gap between two adjacent unfolded parts 22, making the curvature of the arc-shaped part 21 adjustable to accommodate flanges 5 with various curvatures. Specifically, the fixing plate 1, as a basic component, defines the length X, providing a reference for the installation and adjustment of other components. Its different positions along the length X can be used to fix the fastener 3, which is the key to realizing the tooling adjustment function.

[0043] The pallet 2 includes an arc-shaped portion 21 and multiple unfolded portions 22. The arc-shaped portion 21 directly contacts the inner peripheral wall 51 of the flange 5. The multiple unfolded portions 22 are arranged at intervals along the arc length of the arc-shaped portion 21. The unfolded portions 22 can be connected to the fixed plate 1 through the fixing member 3 and the angle can be adjusted, thereby changing the curvature of the arc-shaped portion 21 to adapt to flanges 5 with different curvatures. This is one of the core structures for realizing the variable diameter of the tooling.

[0044] The fastener 3 connects the unfolded part 22 to the fixed plate 1. By fixing it at different positions in the length direction X of the fixed plate 1, the gap between adjacent unfolded parts 22 can be adjusted, thereby changing the curvature of the arc part 21. This connection and adjustment method allows the tooling to flexibly adapt to flanges 5 with various curvatures.

[0045] The working principle of the heat treatment fixture 100 provided in this embodiment is as follows:

[0046] To accommodate flanges 5 with different curvatures: When facing flanges 5 with different curvatures, the gap between adjacent unfolded sections 22 is changed by moving the position of the fixing member 3 along the length X of the fixing plate 1. The change in the angle of the unfolded section 22 causes the curvature of the arc-shaped section 21 to change, so that the arc-shaped section 21 can closely fit the inner peripheral wall 51 of the flange 5 with different curvatures. The heating element 6 is placed between the support plate 2 and the flange 5, thus ensuring that the heating element 6 is in full contact with the flange 5 and improving the heat treatment effect.

[0047] By adjusting the curvature of the arc section 21, this tooling can adapt to flanges 5 with various curvatures, breaking the limitation that traditional special tooling can only be adapted to a single specification of flange 5, reducing the cost and time of customizing tooling for different specifications of flange 5, and improving the efficiency and economy of tooling use.

[0048] The adjustable design of the fastener 3 allows the tooling to be quickly adjusted according to the actual flange 5 specifications during on-site use. This simplifies operation, improves work efficiency, and is especially suitable for scenarios such as nuclear power plant nuclear island emergency water systems where there are multiple flange 5 specifications and frequent heat treatment is required.

[0049] By adopting the above technical solution, the new tooling can adapt to various specifications of flanges 5, eliminating the need to customize tooling for different specifications of flanges 5, saving a significant amount of customization costs, and avoiding resource waste caused by repeated manufacturing. Moreover, the tooling has a simple structure and uses simple materials, and can be manufactured using existing spare parts inventory in power plants, eliminating the need for special purchases, further reducing costs.

[0050] Traditional integrated, customized tooling is bulky, inconvenient to disassemble and transport, and consumes a significant amount of time during nuclear power plant overhauls and maintenance. The new tooling adopts a modular design, which facilitates disassembly and installation, and can be quickly assembled and debugged on flanges 5 in different locations, greatly reducing the overhaul time, ensuring the overhaul schedule matches the plan, and improving overall maintenance efficiency.

[0051] In one embodiment, the heat treatment fixture 100 further includes a support member 4, one end of which is connected to the arc-shaped portion 21, and the other end of which is used to abut against the other side of the inner peripheral wall 51 of the flange 5. The support member 4 is used to push the arc-shaped portion 21 to abut against one side of the inner peripheral wall 51 of the flange 5.

[0052] Specifically, one end of the support member 4 is connected to the support plate 2, so that the arc-shaped part 21 abuts against one side of the inner peripheral wall 51 of the flange 5, and the other end abuts against the other side of the inner peripheral wall 51 of the flange 5. Its support length is adjustable to adapt to flanges 5 of different diameters, ensuring that the tooling can be stably supported and positioned on flanges 5 of different specifications.

[0053] To accommodate flanges 5 of different diameters: The support length of the support member 4 is adjustable. Adjusting the length of the support member 4 according to the diameter of the flange 5 ensures that both ends reliably abut against the inner circumferential wall 51 of the flange 5. During adjustment, not only is stable installation of the tooling on flanges 5 of different diameters guaranteed, but the fit between the heating element 6 and the flange 5 can also be fine-tuned according to actual conditions to meet the heat treatment requirements of flanges 5 of different specifications.

[0054] The traditional dedicated heat treatment fixture 100, with its fixed clamping device, cannot adjust the fit between the heating element 6 and the flange 5, affecting the heat treatment effect. The new fixture features an adjustable support member 4, allowing for fine-tuning of the fit between the heating element 6 and the flange 5, ensuring a tight seal, uniform heat transfer, and compliance with heat treatment curve requirements, thus improving heat treatment quality. Furthermore, the adjustable curvature of the support plate 2 accommodates flanges 5 with varying curvatures, and the support member 4 adapts to flanges 5 of different diameters, better meeting the heat treatment needs of flanges of different specifications and resulting in more stable and reliable heat treatment effects.

[0055] On-site flanges 5 are mostly distributed with their end faces perpendicular to the ground, and the welding repair positions are random and vary in size. The new tooling, through the adjustable curvature of the support plate 2 and the length of the support component 4, can flexibly adapt to various flange sizes 5 and different welding repair positions (horizontal, horizontal, vertical, and overhead), without being limited by the flange size and position. Compared with traditional tooling that can only be applied to fixed sizes, it has greater adaptability and flexibility, and can better meet the complex maintenance conditions of nuclear power plants.

[0056] In one embodiment, the extended portion 22 is perpendicular to the arcuate portion 21, and the extended portion 22 is used to abut against the end face 52 that is perpendicular to the inner peripheral wall 51 of the flange 5.

[0057] The design of the extended portion 22 being perpendicular to the arc-shaped portion 21 allows the tooling to form a stable mechanical structure when mated with the flange 5. When the extended portion 22 abuts against the end face 52 perpendicular to the inner peripheral wall 51 of the flange 5, the vertical connection method can evenly distribute the force on the tooling onto the flange 5. During the heat treatment of the flange 5, physical changes such as thermal expansion and contraction will occur. This vertical structure can effectively resist the stress generated by thermal deformation, prevent the tooling from shifting or shaking on the flange 5, ensure that the heating element 6 is always stably attached to the flange 5, and ensure the stability and reliability of the heat treatment process.

[0058] The extended portion 22 abuts against the end face 52 perpendicular to the inner circumferential wall 51 of the flange 5, ensuring uniform contact between the heating element 6 and the flange 5. Due to the perpendicular contact, when adjusting the tooling to accommodate flanges 5 of different sizes, the extended portion 22 can uniformly adjust the degree of contact with the flange 5 radially. When processing large-diameter flanges 5, the extended portion 22 can expand outwards uniformly, ensuring a large-area tight fit between the heating element 6 and the flange 5; when processing small-diameter flanges 5, the extended portion 22 contracts inwards, similarly ensuring good contact throughout, avoiding uneven heating caused by poor localized fit, and improving the quality of heat treatment.

[0059] This design enhances the tooling's flexibility in adapting to flanges 5 of different specifications. Regardless of the inner diameter of the flange 5, the extended portion 22, perpendicular to the curved portion 21, can effectively abut against the end face 52 perpendicular to the inner circumferential wall 51 of the flange 5 by adjusting its extension angle. For flanges 5 with different curvatures, the extended portion 22 can also maintain perpendicular abutment against the end face 52 of the flange 5 by adjusting its position on the fixing plate 1. This allows the tooling to adapt to various specifications of carbon steel flanges 5 in the emergency water system of the nuclear island of nuclear power plants, meeting diverse heat treatment requirements.

[0060] In one embodiment, the multiple unfolding sections 22 have an axisymmetric structure, and there are two fixing members 3. One fixing member 3 is connected to one unfolding section 22 located on one side of the axis of symmetry, and the other fixing member 3 is connected to one unfolding section 22 located on the other side of the axis of symmetry. The positions of the two fixing members 3 in the length direction X of the fixing plate 1 are adjustable, so that the gap between the two unfolding sections 22 is adjustable. Specifically, the number of fixing members 3 is set to two, and they are respectively connected to the unfolding sections 22 located on both sides of the axis of symmetry. This design creates a stable and adjustable structure. The change of the position of the two fixing members 3 in the length direction X of the fixing plate 1 directly affects the gap between the two unfolding sections 22. When it is necessary to adapt to flanges 5 with different curvatures, the gap between the two opposite unfolding sections 22 can be flexibly adjusted by moving the fixing members 3. When processing flanges 5 with small curvature, the two fixing members 3 can be moved closer to each other to reduce the gap between the relatively unfolded parts 22. The unfolded parts 22 drive the curved parts 21 to bend inward, thereby changing the curvature of the curved parts 21 and making the curvature of the curved parts 21 smaller. Conversely, when processing flanges 5 with large curvature, the two fixing members 3 can be moved further apart in opposite directions to increase the gap between the unfolded parts 22. The unfolded parts 22 drive the curved parts 21 to bend outward, thereby increasing the curvature of the curved parts 21. This ensures that the curved parts 21 can fit tightly against the inner circumferential wall 51 of flanges of different specifications, ensuring good contact between the heating element 6 and the flange 5 and improving the heat treatment effect.

[0061] Using only two fixing parts 3 to adjust the angle of the relative unfolded part 22 greatly simplifies the operation process compared to adjusting multiple unfolded parts 22 one by one. When using it on site, the staff only needs to focus on adjusting the position of the two fixing parts 3 to effectively control the overall curvature of the tooling. This simple adjustment method reduces the number of operation steps, lowers the difficulty of adjustment, and improves work efficiency. Especially during nuclear power plant overhauls, when dealing with many flanges 5 of different specifications that need heat treatment, it can save a lot of time and ensure the maintenance schedule.

[0062] The position adjustment function of the two fasteners 3 enhances the versatility of the tooling. In the emergency water system of a nuclear power plant's nuclear island, various sizes of carbon steel flanges 5 exist. By adjusting the gap between the relative unfolded portions 22 using these two fasteners 3, the tooling can accommodate flanges 5 of different diameters and curvatures. Whether it's a small or large flange 5, adjusting the position of the fasteners 3 changes the curvature of the curved portion 21, ensuring stable installation and effective heat treatment. This reduces the need for customized tooling for different flange sizes 5, thus lowering costs.

[0063] In one embodiment, there are two fixing plates 1, which are located on opposite end faces 52 of the flange 5. The fastener 3 connects the two fixing plates 1, and the extension part 22 is located between one of the fixing plates 1 and the end face 52 of the flange 5.

[0064] Specifically, two fixing plates 1 are set and located on opposite end faces 52 of the flange 5, respectively. This arrangement makes the force on the tooling on the flange 5 more uniform and symmetrical. When the fixing member 3 connects the two fixing plates 1, a stable clamping structure is formed on both sides of the flange 5, effectively constraining the unfolded part 22 and the arc-shaped part 21, ensuring their stable position during operation. The unfolded part 22 is located between one of the fixing plates 1 and the end face 52 of the flange 5, providing a clear installation position and support structure for the unfolded part 22, enabling it to better perform its function of abutting against the vertical end face 52 of the inner peripheral wall 51 of the flange 5, ensuring that the heating element 6 is tightly fitted to the flange 5, and improving the heat treatment effect.

[0065] The design of two fixing plates 1 facilitates the adjustment of the tooling. Since the fixing element 3 connects the two fixing plates 1, by changing the position of the fixing element 3 on the fixing plates 1, the gap between the two unfolded portions 22 can be adjusted simultaneously, thereby precisely adjusting the curvature of the arc portion 21 to accommodate flanges 5 of different specifications. When handling flanges 5 of different diameters and curvatures, the operator only needs to operate the fixing element 3 simultaneously on both fixing plates 1 to quickly complete the tooling adjustment. Compared to a single-sided fixing plate 1 design, the operation is simpler and faster, greatly improving work efficiency.

[0066] The symmetrical layout of the two fixing plates 1 and the connection method of the fasteners 3 enhance the overall stability of the tooling. During the heat treatment process, the flange 5 will deform due to heat. The two fixing plates 1 can jointly resist the effects of this deformation from both sides, maintaining the relative position stability between the tooling and the flange 5. At the same time, this structure can better withstand the thermal stress generated by the heating element 6 during operation, preventing the tooling from loosening or shifting, ensuring the reliability of the heat treatment work, and guaranteeing that the quality of each heat treatment meets the expected standards.

[0067] In one embodiment, each unfolded portion 22 is provided with a fixing hole 221, and one of the fixing members 3 is inserted into the fixing hole 221 of the unfolded portion 22.

[0068] Each unfolded section 22 is provided with a fixing hole 221, and a fixing member 3 can be selectively inserted into it, providing a precise control method for tooling adjustment. The fixing holes 221 at different positions correspond to different gaps. When it is necessary to adjust the curvature of the arc section 21 to fit a flange 5 of a specific specification, the included angle between adjacent unfolded sections 22 can be precisely changed by selecting the fixing member 3 inserted into different fixing holes 221. To adapt to a flange 5 with a smaller curvature, the fixing member 3 can be inserted into the fixing hole 221 that reduces the included angle of the unfolded section 22; conversely, when dealing with a flange 5 with a large curvature, a fixing hole 221 that increases the included angle is selected to achieve fine adjustment of the curvature of the arc section 21, ensuring that the heating plate 6 fits tightly against the inner peripheral wall 51 of the flange 5 of different specifications, thereby improving the heat treatment effect.

[0069] The fastener 3 passes through the fixing hole 221, providing a stable fixing point for the unfolded part 22. During heat treatment, the flange 5 will expand and contract due to heat, and the tooling will also be subjected to certain stresses. The cooperation between the fastener 3 and the fixing hole 221 effectively restricts the displacement of the unfolded part 22, ensuring that the unfolded part 22 maintains a stable position during operation. This, in turn, ensures stable contact between the entire arc-shaped part 21 and the inner peripheral wall 51 of the flange 5, preventing poor contact between the heating element 6 and the flange 5 due to shaking or displacement of the unfolded part 22. This enhances the structural stability and reliability of the tooling during the heat treatment process.

[0070] The design of the fixing hole 221 and the fastener 3 makes the adjustment of the tooling simple and easy. When using it on-site, workers can easily pull the fastener 3 out of one fixing hole 221 and insert it into another suitable fixing hole 221 without needing complicated tools or professional skills, quickly completing the adjustment of the tooling. This convenient adjustment method improves work efficiency, especially during nuclear power plant overhauls, when a large number of flanges 5 of different specifications need to be heat-treated, saving valuable time and ensuring that maintenance work is completed on time.

[0071] In one embodiment, the fixing plate 1 is provided with an arc-shaped groove 11, and the fixing member 3 includes a fixing screw 31 and two fixing nuts 32 connected to both ends of the fixing screw 31. The fixing screw 31 passes through the arc-shaped groove 11 and can move along the arc length direction of the arc-shaped groove 11, so that the gap of the unfolded part 22 is adjustable. The gap of the unfolded part 22 is fixed when the fixing nuts 32 are locked to the fixing screw 31.

[0072] Specifically, the fixing plate 1 is provided with an arc-shaped groove 11. In this embodiment, the arc length direction of the arc-shaped groove 11 is the length direction X of the fixing plate 1. The fixing screw 31 passes through the arc-shaped groove 11 and can move along the arc length direction. This design gives the gap of the unfolded part 22 a flexible adjustment capability. When it is necessary to adjust the tooling to adapt to flanges 5 of different specifications, the operator can easily change the gap of the unfolded part 22 by moving the position of the fixing screw 31 in the arc-shaped groove 11. Because the fixing screw 31 is connected to the fixing member 3, its position change will drive the fixing member 3 and the unfolded part 22 to move, thereby realizing the adjustment of the arc of the arc-shaped part 21 to meet the heat treatment requirements of flanges 5 with different arcs. This adjustment method is simple to operate and can quickly respond to the processing requirements of flanges 5 of different specifications on site.

[0073] The fastener 3 employs a design with a fixing screw 31 and two fixing nuts 32, which greatly improves the accuracy and stability of adjustment. During adjustment, by finely adjusting the position of the fixing screw 31 in the arc groove 11, the gap of the unfolded part 22 can be precisely controlled, enabling fine adjustment of the tooling curvature and ensuring a tight fit between the heating element 6 and the inner peripheral wall 51 of the flange 5. After adjusting to the appropriate angle, tightening the fixing nuts 32 locks them onto the fixing screw 31, firmly fixing the gap of the unfolded part 22 and preventing changes in the gap due to vibration, thermal stress, or other factors during heat treatment. This ensures stable operation of the tooling throughout the heat treatment process and guarantees the consistency and reliability of the heat treatment effect.

[0074] This design optimizes the overall structure and function of the heat treatment fixture 100. On one hand, the cooperation between the arc groove 11 and the fixing screw 31 provides guidance for the angle adjustment of the unfolded part 22, making the adjustment process more orderly and controllable. On the other hand, the locking mechanism of the fixing nut 32 enhances the structural stability, enabling the fixture to maintain good performance even in complex working environments. This solution effectively solves the problem that traditional fixtures cannot flexibly adapt to flanges 5 of different specifications, improves the versatility and practicality of the fixture, reduces production costs, and provides reliable technical support for the heat treatment of carbon steel flanges 5 in the nuclear island emergency water system of nuclear power plants.

[0075] In another embodiment, a plurality of threaded holes are arranged at intervals along the circumference of the flange 5 on the fixing plate 1. The fixing member 3 includes a fixing screw 31 and two fixing nuts 32 connected to both ends of the fixing screw 31. The fixing screw 31 is selectively inserted into the threaded hole, so that the gap of the unfolded part 22 is adjustable. By adopting the above technical solution, the gap of the unfolded part 22 can also be precisely controlled, thereby realizing the adjustment of the tooling arc shape.

[0076] In one embodiment, the support member 4 includes a first rod 41 and a second rod 42 threadedly connected to the first rod 41. The first rod 41 is connected to the arcuate portion 21, and the second rod 42 is used to abut against the other side of the inner peripheral wall 51 of the flange 5. When the second rod 42 rotates relative to the first rod 41, the distance between the two is adjustable, so that the length of the support member 4 is adjustable.

[0077] Specifically, flanges 5 of different specifications have different diameters. To ensure that the heat treatment fixture 100 can work stably on flanges 5 of various diameters, the support member 4 needs to have a length adjustment function. In this solution, through the threaded connection of the first rod 41 and the second rod 42, when the second rod 42 rotates relative to the first rod 41, the distance between them changes, thereby achieving the adjustment of the length of the support member 4. When dealing with a large-diameter flange 5, rotating the second rod 42 increases the distance between it and the first rod 41, thereby increasing the overall length of the support member 4 and allowing the fixture to fit. For a small-diameter flange 5, rotating the second rod 42 in the opposite direction shortens the distance between them, reducing the length of the support member 4 and ensuring that the fixture can also be installed and used normally on small-diameter flanges 5.

[0078] During heat treatment, the fixture needs to be in close and stable contact with the flange 5 to ensure a good fit between the heating element 6 and the flange 5, achieving uniform heating. The adjustable length of the support member 4 ensures that the fixture maintains a stable contact with the inner circumferential wall 51 of the flange 5 on flanges of different diameters. The first rod 41 is connected to the arc-shaped part 21, and the second rod 42 abuts against the other side of the inner circumferential wall 51 of the flange 5. By adjusting the length of the support member 4, the fixture is reliably supported inside the flange 5, avoiding unstable support that could lead to a loose fit between the heating element 6 and the flange 5, thus affecting the heat treatment effect.

[0079] Adjusting the length of the support member 4 using a threaded connection is relatively simple. Operators can easily change the length of the support member 4 by simply rotating the second rod 42. Furthermore, the threaded connection offers good adjustment precision; with each rotation at a certain angle, the distance between the first rod 41 and the second rod 42 will change precisely accordingly. This allows for accurate adjustment of the support member 4's length to accommodate flanges 5 of different diameters, ensuring the installation accuracy of the tooling and the effectiveness of heat treatment.

[0080] This solution enhances the versatility of the heat treatment fixture 100, allowing the same fixture to be used for flanges 5 of various diameters, eliminating the need to design and manufacture dedicated fixtures for flanges 5 of different diameters, thus reducing production costs. Simultaneously, it reduces the quantity of fixture inventory and management costs, improves the efficiency of fixture use, and enhances the overall economic efficiency of the heat treatment process.

[0081] In one embodiment, the second rod 42 is provided with a support base 43 that abuts against the flange 5. The support base 43 is provided with an arc-shaped surface 431 that abuts against the flange 5. A locking buckle 44 is movably connected between the support base 43 and the flange 5.

[0082] Specifically, the support base 43 increases the contact area between the second rod 42 and the flange 5, making the tooling more stable on the flange 5. The arc-shaped surface 431 on the support base 43 abuts against the flange 5. This arc design can better conform to the shape of the inner circumferential wall 51 of the flange 5. Regardless of the flange 5 of any specification, the arc-shaped surface 431 can make close contact with it, evenly distributing the force on the tooling to the flange 5, reducing local stress concentration, and effectively preventing unstable phenomena such as shaking and displacement of the tooling during heat treatment. This ensures that the heating plate 6 and the flange 5 always maintain a good fit, providing a guarantee for stable heat treatment results.

[0083] The locking buckle 44 secures the support base 43 to the flange 5. After adjusting the length of the support component 4 to initially install the fixture on the flange 5, the locking buckle 44 further fixes the relative position of the support base 43 and the flange 5, ensuring a tight fit between them and preventing gaps due to thermal expansion and contraction, vibration, or other factors. This not only enhances the stability of the fixture but also prevents heat transfer issues caused by a loose fit, ensuring uniform heat transfer to the flange 5 during heat treatment and improving the quality of the heat treatment process.

[0084] The locking buckle 44 employs a movable connection method, facilitating on-site operation by workers. When installing the fixture, workers can first place the support base 43 on the flange 5, adjust the length of the support member 4 to initially position the fixture, and then easily operate the locking buckle 44 to secure the support base 43 to the flange 5. Disassembling the fixture is also straightforward; simply loosening the locking buckle 44 allows for easy removal from the flange 5, improving work efficiency. Furthermore, this movable connection method allows for minor adjustments to the fixture's position without complete disassembly; these adjustments can be made simply by loosening or tightening the locking buckle 44, making operation simple and convenient.

[0085] In one embodiment, there are two support members 4, which are arranged in parallel and spaced apart, and are arranged radially parallel to the flange 5.

[0086] Specifically, during the heat treatment of flange 5, the fixture is subjected to thermal stress from heating element 6 and forces generated by thermal expansion and contraction of flange 5. Two parallel support members 4 can better balance these forces, ensuring that the fixture is always stably located inside flange 5, ensuring that heating element 6 fits tightly with flange 5, so that the heat treatment process proceeds smoothly and the stability and reliability of heat treatment effect are improved.

[0087] The two radially arranged supports 4 on the parallel flange 5 ensure a more uniform force distribution on the tooling. Because the supports 4 are parallel to the radial direction of the flange 5, they can evenly bear the reaction force from the inner circumferential wall 51 of the flange 5, preventing excessive localized stress on the tooling due to uneven force distribution, which could damage the tooling or affect the fit between the heating element 6 and the flange 5. This uniform force distribution ensures stable operation of the tooling under various conditions during heat treatment of flanges 5 of different specifications, guaranteeing consistent heat treatment quality.

[0088] Secondly, a nuclear power plant maintenance equipment is provided, including a main body of the nuclear power plant maintenance equipment and the aforementioned heat treatment fixture 100, wherein the heat treatment fixture 100 is used in conjunction with the main body of the nuclear power plant maintenance equipment.

[0089] By adopting the above technical solutions, we address the numerous and complex equipment in nuclear power plants, which involves various operations during maintenance. Integrating the heat treatment fixture 100 into the nuclear power plant maintenance equipment system compensates for the shortcomings of traditional maintenance equipment in the heat treatment process after welding repairs to carbon steel flange 5. Carbon steel flange 5 in the nuclear island emergency water system requires welding repair and heat treatment due to seawater corrosion. The heat treatment fixture 100 can perform preheating, post-heating, and stress-relieving heat treatment functions, working in conjunction with other functions of the main maintenance equipment. This improves the maintenance process for key components of the nuclear power plant, ensuring comprehensive and thorough maintenance work and guaranteeing the overall performance of the equipment.

[0090] The Heat Treatment Fixture 100 is specifically designed for carbon steel flanges 5 of various specifications. Its variable diameter and adjustable features allow for rapid adaptation to various flange 5 types. During maintenance, it is used in conjunction with the main maintenance equipment, reducing time wasted due to tooling changes or waiting for custom-made tooling. Workers can quickly switch operations, first using the main maintenance equipment to complete preliminary work such as flange 5 repair welding, and then immediately using the Heat Treatment Fixture 100 for subsequent heat treatment. This achieves seamless transition in maintenance work, significantly improving maintenance efficiency, shortening nuclear power plant downtime, and reducing economic losses caused by downtime.

[0091] This solution improves the versatility of the entire maintenance equipment. The heat treatment fixture 100 can accommodate various flange sizes 5 and, in conjunction with the main body of the maintenance equipment, enables the entire set of equipment to handle maintenance tasks for carbon steel flanges 5 of different sizes, eliminating the need for a separate maintenance equipment set for each size. Moreover, the heat treatment fixture 100 has a simple structure and can be manufactured in-house, reducing procurement costs, improving the economic efficiency of the equipment, and optimizing the allocation of maintenance resources in nuclear power plants.

[0092] Precise heat treatment is crucial for ensuring the quality of weld repair on carbon steel flange 5. The heat treatment fixture 100 can be adjusted to ensure a tight fit between the heating element 6 and flange 5, guaranteeing that the heat treatment curve meets requirements and improving the heat treatment effect. Used in conjunction with the main maintenance equipment, it establishes a standardized, high-quality maintenance process from weld repair to heat treatment, reducing performance degradation of flange 5 caused by improper heat treatment, improving the reliability of flange 5 and the entire piping system, and ensuring the safe and stable operation of the nuclear power plant.

[0093] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat treatment fixture, characterized in that, include: The pallet includes an arc-shaped portion and a plurality of unfolded portions arranged at intervals along the arc length direction of the arc-shaped portion. One end of each unfolded portion is connected to the arc-shaped portion, and the other end of the unfolded portion away from the arc-shaped portion is freely disposed. The arc-shaped portion is used to contact one side of the inner peripheral wall of the flange, and the unfolded portion is used to contact the end face of the flange. A fixing plate is disposed on the side of the unfolded portion opposite to the end face of the flange, and the length direction of the fixing plate extends along the circumference of the flange; A fastener connects the unfolded part to the fixed plate; The fastener can be fixed at different positions along the length of the fixed plate to adjust the gap between two adjacent unfolded parts, so that the curvature of the arc-shaped part can be adjusted to adapt to flanges with various curvatures.

2. The heat treatment fixture as described in claim 1, characterized in that, The heat treatment fixture also includes a support member, one end of which is connected to the arc-shaped portion, and the other end of which is used to abut against the other side of the inner circumferential wall of the flange. The support member is used to push the arc-shaped portion to abut against one side of the inner circumferential wall of the flange.

3. The heat treatment fixture as described in claim 1, characterized in that, The plurality of unfolding parts are axially symmetrical structures. There are two fixing members. One fixing member is connected to one of the unfolding parts located on one side of the axis of symmetry, and the other fixing member is connected to one of the unfolding parts located on the other side of the axis of symmetry. The positions of the two fixing members in the length direction of the fixing plate are adjustable, so that the gap between the two unfolding parts is adjustable.

4. The heat treatment fixture as described in claim 1, characterized in that, The number of fixing plates is two, and the two fixing plates are respectively located on opposite end faces of the flange. The fastener connects the two fixing plates, and the unfolded part is located between one of the fixing plates and the end face of the flange.

5. The heat treatment fixture as described in claim 4, characterized in that, Each of the unfolded sections is provided with a fixing hole, and one of the fixing members is inserted into the fixing hole of the unfolded section.

6. The heat treatment fixture as described in claim 5, characterized in that, The fixing plate is provided with an arc-shaped groove extending circumferentially along the flange. The fixing member includes a fixing screw and two fixing nuts connected to both ends of the fixing screw. The fixing screw passes through the arc-shaped groove and can move along the arc length direction of the arc-shaped groove, so that the gap of the unfolded part is adjustable. The gap of the unfolded part is fixed when the fixing nuts are locked to the fixing screw. Alternatively, the fixing plate may have a plurality of threaded holes spaced apart along the circumference of the flange, and the fixing member may include a fixing screw and two fixing nuts connected to both ends of the fixing screw. The fixing screw may be selectively inserted into the threaded hole, so that the gap of the unfolded part is adjustable.

7. The heat treatment fixture as described in claim 2, characterized in that, The support member includes a first rod and a second rod threadedly connected to the first rod. The first rod is connected to the arc-shaped portion, and the second rod is used to abut against the other side of the inner circumferential wall of the flange. When the second rod rotates relative to the first rod, the distance between the two is adjustable, so that the length of the support member is adjustable.

8. The heat treatment fixture as described in claim 7, characterized in that, The second rod body is provided with a support base that abuts against the flange. The support base is provided with an arc-shaped surface that abuts against the flange. A locking buckle is movably connected between the support base and the flange.

9. The heat treatment fixture as described in claim 7, characterized in that, The number of the support members is two, and the two support members are arranged in parallel and spaced apart, and the support members are arranged radially parallel to the flange.

10. A nuclear power plant maintenance equipment, characterized in that, It includes the main body of nuclear power plant maintenance equipment and the heat treatment fixture as described in any one of claims 1 to 9, wherein the heat treatment fixture is used in conjunction with the main body of the nuclear power plant maintenance equipment.

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