A flange centering device for large-diameter nuclear-grade valves used in nuclear power plants

Abstract

The utility model relates to a kind of flange centering device of large-diameter nuclear level valve applied in nuclear power plant, including the centering rod for inserting valve middle flange bolt hole, wedge bar inserted into centering rod and four compensation blocks installed on centering rod, wherein, the inside of the stem of centering rod is equipped with the axial cavity capable of inserting wedge bar, stem circumferential direction is evenly provided with four axial slots capable of installing compensation block, axial slot is communicated with axial cavity;The one end of wedge bar is provided with conical head, and the conical head includes first slope, and the side end of compensation block towards axial cavity is provided with second slope matched with first slope.Compared with prior art, the utility model can realize accurate centering of valve middle flange, the device is easy to operate, widely applicable, can improve the working efficiency of large-diameter nuclear level valve middle flange centering, reduce the requirement for operating skill of operator, save flange installation time, reduce the irradiation time of personnel.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant maintenance auxiliary technology, and in particular to a flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants. Background Technology

[0002] During each major overhaul, the PV01 nuclear-grade gate valve is included in the nuclear island maintenance program. As an important nuclear-grade piece of equipment, the PV01 nuclear-grade gate valve has a dedicated working group. During each overhaul cycle, preventative disassembly and inspection of the valve are carried out. When reinstalling the valve cover, the alignment of the middle flange is a key step to ensure the quality of the maintenance.

[0003] Traditional methods involve lifting the valve cover, manually pulling and visually inspecting it, and using a steel ruler to fix the gasket, attempting to ensure the groove on the valve cover's flange face smoothly enters the groove on the valve body's flange face. This traditional method has significant drawbacks: 1. Improper operation can easily damage the gasket by squeezing the groove on the valve cover's flange face; 2. When reinstalling the valve cover, the shaking of the hand-operated hoist can easily dislodge the initially placed gasket, potentially causing external leakage after the valve is put into operation; 3. The valve's installation location on site is often unfavorable, with the flange connection area of ​​most valves obstructed, making it difficult for operators to visually inspect the flange alignment and determine if the valve cover is installed correctly, posing a risk to maintenance quality.

[0004] Patent CN115091186 A discloses a guide device for a threaded flange of a large container-type equipment in a nuclear power plant. It includes several guide bolts, each of which is in the shape of a round bar with a threaded section at the bottom for threaded connection with the equipment body. Although it can achieve automatic alignment of the flange cover plate and the equipment body flange and automatic alignment of the bolt holes, the threaded section 3 of the device is screwed into the "threaded hole" of the equipment body. This device cannot be used for the alignment of flanges with smooth bolt holes.

[0005] Therefore, there is an urgent need to develop a flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants. Utility Model Content

[0006] The purpose of this invention is to provide a flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants, which can achieve precise alignment of flanges in valves, improve the efficiency of flange alignment in large-diameter nuclear-grade valves, reduce the skill requirements of operators, and save flange installation time.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants includes an alignment rod that can be inserted into the bolt holes of the valve flange, a wedge rod that can be inserted into the alignment rod, and four compensation blocks that can be mounted on the alignment rod.

[0009] The centering rod includes a rod body, and the inside of the rod body has a cavity along its axial direction for inserting the wedge rod. The rod body has four slots evenly distributed along its circumference for installing the compensation blocks. The four slots correspond one-to-one with the four compensation blocks. Each slot extends radially from its outer surface inward along the rod body and communicates with the cavity.

[0010] One end of the wedge rod is provided with a tapered head, the tapered head including a first inclined surface, and the end of the compensation block facing the cavity is provided with a second inclined surface that cooperates with the first inclined surface.

[0011] Preferably, when the wedge is inserted and pressed down along the cavity axial direction, the first inclined surface, through its cooperation with the second inclined surface, pushes the compensation block to move radially along the slot and presses against the inner wall of the flange bolt hole in the valve, thereby achieving centering.

[0012] Preferably, the compensation block has a first protrusion and a second protrusion extending outward along the axial direction at both ends. The first protrusion and the second protrusion are located on the side of the compensation block facing the cavity, and the first protrusion and the second inclined surface are at the same end.

[0013] Preferably, the axial distance between the first protruding end and the second protruding end is greater than the axial length of the slot, the thickness of the compensation block is greater than the groove depth, the side of the compensation block facing away from the cavity is a smooth arc surface, and the curvature of the smooth arc surface is adapted to the inner wall curvature of the flange bolt hole in the valve.

[0014] Preferably, the central angle corresponding to the smooth arc surface is 23-27°, and more preferably 25°.

[0015] Preferably, the flange bolt holes in the valve include bolt holes on the middle flange face of the valve cover and bolt holes on the middle flange face of the valve body.

[0016] In this invention, the side of the compensation block facing away from the cavity is a smooth arc surface, so as to fit tightly against the bolt holes of the middle flange of the valve cover and the inner wall of the bolt holes of the middle flange of the valve body, and to prevent damage to the bolt holes of the middle flange during the alignment process.

[0017] Preferably, the axial length of the compensation block on the side facing away from the cavity is 198-202mm, the axial length on the side facing the cavity is 200-208mm, the thickness of the compensation block is 14-16mm, the axial length of the slot is 198-202mm, and the axial protrusion length of the first protrusion and the second protrusion is 1-3mm.

[0018] More preferably, the axial length of the compensation block on the side facing away from the cavity is 200mm, the axial length on the side facing the cavity is 204mm, the thickness of the compensation block is 15mm, the axial length of the slot is 200mm, and the axial protrusion length of the first protrusion and the second protrusion is 2mm.

[0019] More preferably, the axial length of the compensation block on the side facing the cavity includes the axial protrusion length of the first protrusion and the second protrusion.

[0020] Preferably, the radial width of the first protrusion is 1-3 mm, the radial width of the second protrusion is 6-8 mm, the radial distance between the side of the compensation block facing away from the cavity and the first protrusion is 16-20 mm, and the radial distance between the side of the compensation block facing away from the cavity and the second protrusion is 16-20 mm.

[0021] More preferably, the radial width of the first protrusion is 2 mm, the radial width of the second protrusion is 7 mm, the radial distance between the side of the compensation block facing away from the cavity and the first protrusion is 18 mm, and the radial distance between the side of the compensation block facing away from the cavity and the second protrusion is 18 mm.

[0022] More preferably, the radial distance between the side of the compensation block facing away from the cavity and the first protrusion refers to the distance between the side of the compensation block facing away from the cavity and the side of the first protrusion facing away from the cavity.

[0023] More preferably, the radial distance between the side of the compensation block facing away from the cavity and the second protrusion refers to the distance between the side of the compensation block facing away from the cavity and the side of the second protrusion facing away from the cavity.

[0024] In this invention, the first protrusion and the second protrusion are used for positioning, so that the compensation block can be installed into the slot without falling off.

[0025] In this invention, the second inclined surface on the first protrusion can cooperate with the first inclined surface at the end of the wedge rod to provide a wedge clamping force for the compensation block.

[0026] In this utility model, the dimensions of the slot and the dimensions of the compensation block must meet the following requirements: the compensation block can be embedded inside the slot, and when subjected to the wedging force of the wedge rod, the compensation block can move outward along the radial direction (slot depth direction) of the slot until the smooth arc surface of the compensation block simultaneously adheres to the inner wall of the bolt hole of the middle flange of the valve body and the bolt hole of the middle flange of the valve cover, so that the two are precisely aligned.

[0027] In this invention, when the compensation block moves outward radially to the smooth arc surface and simultaneously adheres to the inner wall of the bolt hole on the middle flange of the valve body and the bolt hole on the middle flange of the valve cover, the compensation block-centering rod assembly is locked in the bolt hole of the middle flange, forming a rigid support and having a guiding function. When the valve cover is subsequently reinstalled, it can be smoothly moved down and reinstalled along this guiding path without offset or shaking, thus solving the problem of easy misalignment and damage of gaskets in the prior art.

[0028] Preferably, the wedge includes a rod body, the conical head is disposed at the lower part of the rod body, the cross section of the rod body is configured as a cross shape, the end of the centering rod is provided with a round cap, the round cap is provided with a cross-shaped opening for the wedge to be inserted, and the cross-shaped opening communicates with the cavity.

[0029] Preferably, the diameter of the round cap is larger than the diameter of the flange bolt hole in the valve, so that it can be locked onto the upper end of the bolt hole on the middle flange face of the valve cover to prevent the centering rod from falling off.

[0030] Preferably, the axial length of the wedge rod is 156-160mm, and the distance between opposite sides of the cross-shaped cross section is 28-32mm.

[0031] More preferably, the axial length of the wedge rod is 158mm, and the distance between opposite sides of the cross-shaped cross section is 30mm.

[0032] Preferably, the diameter of the centering rod is 48-52mm, the diameter of the round cap is 108-112mm, and the axial length of the centering rod is 298-302mm.

[0033] More preferably, the diameter of the centering rod is 50mm, the diameter of the round cap is 110mm, and the axial length of the centering rod is 300mm.

[0034] More preferably, the centering rod must be sized to allow it to fully penetrate the flange bolt hole in the valve.

[0035] More preferably, the size of the cross-shaped opening needs to be suitable for wedge insertion.

[0036] More preferably, the centering rod has a certain thickness to meet the strength requirements.

[0037] More preferably, the diameter of the centering rod is smaller than the diameter of the flange bolt hole in the valve.

[0038] In this invention, the centering rod has a round cap structure at its end, which can be locked onto the flange surface to prevent the entire rod from falling off; the rod body has a limited length, which not only ensures the insertion depth but also facilitates disassembly and assembly, making the operation safer and more convenient.

[0039] Preferably, the angle α between the second inclined surface of the compensation block and its axis is 13-17°, and the angle β between the first inclined surface of the wedge rod and its axis is 13-17°, wherein the included angle α and included angle β are equal.

[0040] More preferably, the angle α between the second inclined surface of the compensation block and its axis is 15°, and the angle β between the first inclined surface of the wedge rod and its axis is 15°, wherein the included angle α and included angle β are equal.

[0041] Preferably, the end of the conical head has a rounded corner with a radius of 4-6 mm.

[0042] More preferably, the end of the conical head is provided with a rounded corner with a radius of 5mm.

[0043] Preferably, the centering rod, wedge rod, and compensation block are all made of carbon steel.

[0044] In this invention, the centering rod, wedge rod, and compensation block are all made of carbon steel, with a robust structure that can withstand hoisting impacts and frequent disassembly and assembly. They are suitable for the demanding environment of nuclear power plants, have a long service life, and low maintenance costs.

[0045] Preferably, when used for flange alignment in valves, at least four sets of the alignment device are required.

[0046] When using the above-mentioned flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants for alignment, the present invention includes the following main steps:

[0047] S1: Install the four compensation blocks into the slots of the centering rod, and assemble a total of four sets of centering rod assemblies with compensation blocks;

[0048] S2: Select four symmetrically distributed bolt holes on the flange of the valve, and insert the four sets of centering rod assemblies into the bolt holes respectively;

[0049] S3: Insert the wedge rod into the cavity of the centering rod and press the wedge rod down. The wedge action drives the compensation block to move radially outward until it simultaneously presses against the inner wall of the bolt hole of the middle flange of the valve body and valve cover, so that the two are aligned.

[0050] S4: Repeat step S3 for the remaining three sets of centering rod assemblies to complete the centering operation of the entire center flange.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) This utility model provides a flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants through the combined structure design of the centering rod, wedge rod and compensation block. It can achieve accurate alignment of the flange in the valve, improve the working efficiency of flange alignment in large-diameter nuclear-grade valves, reduce the requirements for the operating skills of operators, and save flange installation time.

[0053] (2) In this utility model, both the wedge rod and the compensation block are provided with matching inclined surfaces. Based on the wedge tightening effect, when the wedge rod is pressed down, it can drive the four compensation blocks to move outward radially at the same time, so that the bolt holes on the middle flange surface of the valve cover and the bolt holes on the middle flange surface of the valve body can be quickly and accurately aligned, thereby eliminating the error caused by the fit clearance to the greatest extent and greatly improving the alignment accuracy and reliability.

[0054] (3) When this utility model is used, four sets of compensation blocks-centering rod assemblies are used and symmetrically arranged in the bolt holes of the middle flange on the valve. This layout can achieve a uniform distribution of centering force and further improve the concentricity and installation quality of the entire middle flange connection.

[0055] (4) In this utility model, when the four compensation blocks move outward radially at the same time to fit the bolt hole of the middle flange, they can be tightly locked inside the bolt hole of the middle flange. The compensation block-centering rod assembly can form a stable rigid support structure and has a guiding function, which can effectively suppress the shaking and skew during the subsequent valve cover reinstallation process, fundamentally avoid gasket misalignment, squeezing or damage, and ensure sealing reliability.

[0056] (5) Compared with the prior art, this utility model is universal and can be applied to flange alignment where most bolt holes are smooth holes. Furthermore, the range of motion of the compensation block can be applied to valves with different bolt hole diameters on various flanges, greatly expanding the application range of the device.

[0057] (6) The assembly of the compensation block-centering rod assembly of this utility model can be carried out outside the control area, which effectively reduces the risk of personnel being exposed to radiation and significantly improves the safety of nuclear power plant on-site operations.

[0058] (7) The device of this utility model has a simple structure and clear operation steps, which can reduce the requirements for the work experience and skill level of the user, effectively reduce the irreversible consequences caused by human error, and improve maintenance efficiency and consistency. Attached Figure Description

[0059] Figure 1 This is a front view of the centering rod of this utility model;

[0060] Figure 2 This is a top view of the centering rod of this utility model;

[0061] Figure 3 This is a front view of the compensation block of this utility model;

[0062] Figure 4 This is a top view of the compensation block of this utility model;

[0063] Figure 5 This is an assembly diagram of the compensation block and the centering rod of this utility model;

[0064] Figure 6 This is the front view of the wedge rod of this utility model;

[0065] Figure 7 This is a bottom view of the wedge rod of this utility model;

[0066] Figure 8 This is a schematic diagram illustrating the use of this utility model;

[0067] Figure 9 This is a schematic diagram of the centering rod of this utility model passing through the flange bolt hole in the valve;

[0068] Figure 10 This is a dimensioned drawing of the centering rod in Embodiment 3 of this utility model (a: front view; b: top view);

[0069] Figure 11 Here are the dimensioned drawings of the compensation block in Embodiment 3 of this utility model (a: front view; b: top view);

[0070] Figure 12 Here are the dimensioned drawings of the wedge rod in Embodiment 3 of this utility model (a: front view; b: bottom view);

[0071] In the diagram: 1-centering rod; 11-shaft; 111-cavity; 112-slot; 12-round cap; 121-cross-shaped opening;

[0072] 2-Wedge; 21-Conical head; 211-First inclined plane; 22-Bar body;

[0073] 3-Compensation block; 31-First protrusion; 32-Second protrusion; 33-Second inclined surface; 34-Smooth arc surface;

[0074] 4-Flange bolt holes in valves. Detailed Implementation

[0075] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0076] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0077] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0078] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0079] Example 1

[0080] A flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants, such as Figure 5 As shown, it includes a centering rod 1, which can be inserted into the flange bolt hole 4 in the valve; a wedge rod 2, which can be inserted into the centering rod 1; and four compensation blocks 3, which can be installed on the centering rod 1.

[0081] In this embodiment, the rod body 11 of the centering rod 1 has a cavity 111 inside along its axial direction for the wedge rod 2 to be inserted; the rod body 11 has four slots 112 evenly distributed along its circumferential direction for installing compensation blocks 3; the slots 112 extend radially from its outer surface inward along the rod body 11 and communicate with the cavity 111, and the four slots 112 correspond one-to-one with the four compensation blocks 3.

[0082] One end of the wedge rod 2 is provided with a tapered head 21, which has a first inclined surface 211, and one end of the compensation block 3 is provided with a second inclined surface 33 that cooperates with the first inclined surface 211.

[0083] Example 2

[0084] A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant includes an alignment rod 1 for inserting into the flange bolt holes 4, a wedge rod 2 that can be inserted into the alignment rod 1, and four compensation blocks 3 that can be installed on the alignment rod 1. The flange bolt holes 4 include bolt holes on the flange face of the valve cover and bolt holes on the flange face of the valve body.

[0085] In this embodiment, as Figure 6-7 As shown, the wedge 2 consists of a rod body 22 and a conical head 21 located at the lower part of the rod body 22. The end of the conical head is provided with a rounded corner. The conical head 21 has a first inclined surface 211. The cross section of the rod body 22 is cross-shaped.

[0086] In this embodiment, as Figure 1-2 As shown, the centering rod 1 has a cavity 111 inside its body 11 along its axial direction for the wedge rod 2 to be inserted; four slots 112 are evenly opened around the circumference of the body 11, and the slots 112 extend radially from its outer surface inward and communicate with the cavity 111. The slots 112 are used to install the compensation blocks 3, and each slot 112 corresponds to each compensation block 3; a round cap 12 is provided at the upper end of the body 11, and the round cap 12 has a cross-shaped opening 121 that communicates with the cavity 111 for the wedge rod 2 to be inserted; the diameter of the centering rod 11 is smaller than the diameter of the flange bolt hole 4 in the valve.

[0087] In this embodiment, as Figure 3-4 As shown, the compensation block 3 has a first protrusion 31 and a second protrusion 32 extending outward along the axial direction at both ends on the side facing the cavity 111, and a second inclined surface 33 that cooperates with the first inclined surface 211 at the same end as the first protrusion 31. The axial distance from the end of the first protrusion 31 to the end of the second protrusion 32 is greater than the axial length of the slot 112. The distance from the end of the first protrusion 31 to the second protrusion 32 is used for limiting and preventing the compensation block 3 from falling off. The thickness of the compensation block 3 is greater than the depth of the slot 112, and the side of it facing away from the cavity 111 is a smooth arc surface 34. The curvature of the smooth arc surface 34 is adapted to the inner wall curvature of the flange bolt hole 4 in the valve.

[0088] In this embodiment, the angle α between the second inclined surface 33 of the compensation block 3 and its axis is equal to the angle β between the first inclined surface 211 of the wedge rod 2 and its axis.

[0089] In this embodiment, the centering rod 1, the wedge rod 2, and the compensation block 3 are all made of carbon steel and have a certain rigidity.

[0090] In this embodiment, the wedge rod 2 is inserted into the cavity 111 of the centering rod 1 and pressed down. Through the cooperation of the first inclined surface 211 and the second inclined surface 33, the compensation block 3 is pushed to move radially outward along the slot 112, and at the same time, it presses against the inner wall of the flange bolt hole in the valve cover and the flange bolt hole in the valve body until centering is achieved.

[0091] When using this utility model, such as Figure 8-9 As shown, it includes the following steps:

[0092] S1: Install the four compensation blocks 3 into the slots 112 of the centering rod 1 respectively, and assemble a total of four sets of centering rod assemblies with compensation blocks 3;

[0093] S2: Select four symmetrically distributed bolt holes on the flanges of the valves, and insert the four sets of centering rod assemblies into the bolt holes respectively;

[0094] S3: Insert the wedge rod 2 into the cavity 111 of the centering rod 1, press the wedge rod 2 down, and drive the compensation block 3 to move radially outward through the wedge tightening action until it simultaneously adheres to the inner wall of the middle flange bolt hole of the valve body and valve cover, so that the two are aligned.

[0095] S4: Repeat step S3 for the remaining three sets of centering rod assemblies to complete the centering operation of the entire center flange;

[0096] S5: Reinstall the valve cover onto the valve body.

[0097] Example 3

[0098] A flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants, based on Embodiment 2, with detailed descriptions of the dimensions of each structure as follows:

[0099] In this embodiment, the diameter of the rod body 11 of the centering rod 1 is 50mm, the axial length of the rod body 11 is 300mm, the axial length of the slot 112 inside the rod body 11 is 200mm, the diameter of the round cap 12 on it is 110mm, and the axial height of the round cap 12 is 20mm.

[0100] In this embodiment, the axial length of the rod body 22 of the wedge rod 2 is 158mm, the distance between opposite sides of its cross-shaped cross section is 30mm, the radius of the rounded corner at the end of the conical head 21 is 4-6mm, and the angle β between the first inclined surface 211 of the wedge rod 2 and its axis is 15°.

[0101] In this embodiment, the axial length of the compensation block 3 on the side facing away from the cavity 111 is 200 mm, and the axial length on the side facing the cavity 111 is 204 mm. The thickness of the compensation block 3 is 15 mm, and the axial protrusion length of the first protrusion 31 and the second protrusion 32 on it is 2 mm. The radial width of the first protrusion 31 is 2 mm, and the radial width of the second protrusion 32 is 7 mm. The first protrusion 31 and the second protrusion 32 are both located at the end of the compensation block 3, at a distance of 18 mm from the side of the compensation block 3 facing away from the cavity 111. The angle α between the second inclined surface 33 of the compensation block 3 and its axis is set to 15°.

[0102] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A flange alignment device for large-diameter nuclear-grade valves used in nuclear power plants, characterized in that, Includes a centering rod (1) that can be inserted into the flange bolt hole (4) in the valve, a wedge rod (2) that can be inserted into the centering rod (1), and four compensation blocks (3) that can be installed on the centering rod (1), wherein, The centering rod (1) includes a rod body (11). The rod body (11) has a cavity (111) that allows the wedge rod (2) to be inserted into it along its axial direction. The rod body (11) has four slots (112) that can be used to install the compensation blocks (3) evenly along its circumference. The four slots (112) correspond one-to-one with the four compensation blocks (3). Each slot (112) extends radially from its outer surface inward along the rod body (11) and communicates with the cavity (111). One end of the wedge (2) is provided with a conical head (21), the conical head (21) includes a first inclined surface (211), and the end of the compensation block (3) facing the cavity (111) is provided with a second inclined surface (33) that cooperates with the first inclined surface (211).

2. The flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 1, characterized in that, The compensation block (3) has a first protrusion (31) and a second protrusion (32) extending outward along the axial direction at both ends. The first protrusion (31) and the second protrusion (32) are located on the side of the compensation block (3) facing the cavity (111). The first protrusion (31) and the second inclined surface (33) are at the same end.

3. The flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 2, characterized in that, The axial distance between the end of the first protrusion (31) and the end of the second protrusion (32) is greater than the axial length of the slot (112), the thickness of the compensation block (3) is greater than the groove depth of the slot (112), and the side of the compensation block (3) facing away from the cavity (111) is set as a smooth arc surface (34), the curvature of the smooth arc surface (34) is adapted to the inner wall curvature of the flange bolt hole (4) in the valve.

4. The flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 2, characterized in that, The axial length of the compensation block (3) on the side facing away from the cavity (111) is 198-202mm, and the axial length on the side facing the cavity (111) is 200-208mm. The thickness of the compensation block (3) is 14-16mm. The axial length of the slot (112) is 198-202mm. The axial protrusion lengths of the first protrusion (31) and the second protrusion (32) are both 1-3mm.

5. A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 2, characterized in that, The radial width of the first protrusion (31) is 1-3 mm, the radial width of the second protrusion (32) is 6-8 mm, the radial distance between the side of the compensation block (3) facing away from the cavity (111) and the first protrusion (31) is 16-20 mm, and the radial distance between the side of the compensation block (3) facing away from the cavity (111) and the second protrusion (32) is 16-20 mm.

6. The flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 1, characterized in that, The wedge rod (2) includes a rod body (22), and the conical head (21) is disposed at the lower part of the rod body (22). The cross section of the rod body (22) is set in a cross shape. The end of the rod body (11) of the centering rod (1) is provided with a round cap (12). The round cap (12) is provided with a cross-shaped opening (121) that allows the wedge rod (2) to be inserted. The cross-shaped opening (121) communicates with the cavity (111).

7. A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 6, characterized in that, The axial length of the rod body (22) of the wedge rod (2) is 156-160mm, and the distance between opposite sides of the cross-shaped cross section is 28-32mm.

8. A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 6, characterized in that, The diameter of the rod body (11) of the centering rod (1) is smaller than the diameter of the flange bolt hole (4) in the valve. The diameter of the rod body (11) of the centering rod (1) is 48-52mm. The diameter of the round cap (12) is 108-112mm. The axial length of the rod body (11) is 298-302mm.

9. A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 1, characterized in that, The angle α between the second inclined surface (33) of the compensation block (3) and its axis is 13-17°, and the angle β between the first inclined surface (211) of the wedge rod (2) and its axis is 13-17°. The angle α and the angle β are equal, and the end of the conical head (21) is provided with a rounded corner with a radius of 4-6mm.

10. A flange alignment device for a large-diameter nuclear-grade valve used in a nuclear power plant according to claim 1, characterized in that, The centering rod (1), wedge rod (2), and compensation block (3) are all made of carbon steel.

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