Diffuser clamping method for repairing hydraulic component of main pump of nuclear power station

Abstract

The invention provides a diffuser clamping method for repairing a hydraulic component of a main pump of a nuclear power plant, and belongs to the technical field of repairing and renovating of the hydraulic component of the main pump of the nuclear power plant. The guide vane part of the diffuser abuts against the end face, back on to the workbench, of the supporting cushion block; a first fixing assembly is installed on the workbench, and radial force is applied to the cylinder part of the diffuser through the first fixing assembly; the flange portion of the diffuser abuts against the end face, back on to the workbench, of the supporting cushion block; the second fixing assembly is installed on the workbench, and the second fixing assembly is used for applying the axial pressure towards the workbench to the flange part of the diffuser, so that the problems that the diffuser is complex in structure and large in clamping difficulty are solved, and the positioning precision and the clamping strength of the diffuser are guaranteed.

Description

Technical Field

[0001] The present application belongs to the technical field of repair and renovation of hydraulic components of nuclear power plant main pumps, and more specifically, to a diffuser clamping method for repairing hydraulic components of nuclear power plant main pumps. Background Art

[0002] There are various types of pumps in operation in each system of a nuclear power plant. Among them, in the primary loop system of the nuclear island, the pump used to drive the coolant to circulate in the reactor coolant system is called the nuclear main pump. The main pump is located in the heart of the nuclear island and continuously transfers the heat generated in the core to the steam generator for conversion into thermal energy. It is the key to controlling the water circulation in nuclear power operation and belongs to the primary equipment of the nuclear power plant.

[0003] After the main pump of a nuclear power plant has been running for a long time, the matching dimensions of the hydraulic components in the main pump will be slightly deformed due to the operating conditions. The main pump needs to be disassembled regularly to inspect and maintain its components to eliminate safety hazards in subsequent operations.

[0004] The diffuser is one of the hydraulic components in the main pump of a nuclear power plant. It is used to cooperate with other components in the main pump, such as the heat shield, pump casing, suction guide sleeve, impeller, labyrinth seal, etc. The diffuser is composed of a flange part, a cylinder part and a guide vane part. There are many mating surfaces on the flange part, the cylinder part and the guide vane part. These mating surfaces will be deformed during use, and multiple mating surfaces on the diffuser need to be repaired.

[0005] However, due to the complex structural shape of the diffuser, it is difficult to clamp and fix the diffuser, and the clamping accuracy and stability of the diffuser during the repair process cannot be guaranteed. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant, so as to solve the problem of difficulty in clamping and fixing the diffuser in the prior art.

[0007] To achieve the above-mentioned object, the present application provides a diffuser clamping method, wherein a fixing fixture is used to clamp the diffuser on a workbench of a processing device, wherein the diffuser comprises a flange portion, a barrel portion, and a guide vane portion, and the fixing fixture comprises a support pad, a first fixing assembly, and a second fixing assembly for being installed on the workbench and fixing the diffuser. The diffuser clamping method comprises:

[0008] Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape;

[0009] The guide vane portion is brought into contact with the end surface of the support block facing away from the workbench;

[0010] A first fixing assembly is installed on the workbench, and a radial force is applied to the cylinder portion by using the first fixing assembly; the first fixing assembly is multiple in number and is arranged around the periphery of the diffuser;

[0011] The flange portion is brought into contact with the end surface of the support block facing away from the workbench; and / or;

[0012] A second fixing component is installed on the workbench, and the second fixing component is used to apply an axial pressure toward the workbench to the flange portion; the number of the second fixing components is multiple and they are arranged around the periphery of the diffuser.

[0013] In some embodiments, after installing the support block on the workbench, the method further includes: cutting the end surface of the support block facing away from the workbench.

[0014] In some embodiments, the first fixing assembly includes a base and a fixing claw slidably connected to the base; the first fixing assembly is installed on the workbench, and the first fixing assembly is used to apply a radial force to the barrel portion, including:

[0015] Install the base on the workbench so that the height of the fixed claw matches the height of the barrel;

[0016] The fixing claw is slid toward one side of the cylindrical body so that the fixing claw abuts against the outer peripheral surface of the cylindrical body with a first pressure.

[0017] In some embodiments, before sliding the fixing claw toward one side of the barrel portion, the method further comprises:

[0018] A protective gasket is installed on one end of the fixing claw facing the cylindrical body.

[0019] In some embodiments, the second fixing assembly includes a bottom pad, a pressure plate pressed on the bottom pad, and a pressure component for applying pressure to the pressure plate; the second fixing assembly is installed on the workbench, and the second fixing assembly is used to apply axial pressure to the flange portion toward the workbench, including:

[0020] Installing the bottom pad on the workbench;

[0021] One end of the pressing plate is pressed on a side of the bottom pad facing away from the workbench, and the other end is pressed on an end surface of the flange portion facing away from the workbench;

[0022] The pressure component is mounted on the workbench to apply axial pressure to the pressure plate in a direction toward the flange portion.

[0023] In some embodiments, the pressure component includes a pressure screw and a pressure nut threadedly connected to the pressure screw, and the pressure plate is provided with a through hole for the pressure screw to pass through; the second fixing assembly is installed on the workbench, and the second fixing assembly is used to apply axial pressure to the flange portion toward the workbench, including:

[0024] Passing the pressure screw through the through hole on the pressing plate and installing it on the workbench;

[0025] The pressure nut is connected to the pressure screw and abuts against a side of the pressure plate facing away from the flange portion with a second pressure.

[0026] In some embodiments, the second fixing assembly further includes an adjusting pad, the adjusting pad being threadedly connected to the bottom pad; before the pressure nut is connected to the pressure screw and the second pressure is applied to the side of the pressure plate facing away from the flange portion, the second fixing assembly further includes:

[0027] The pressing plate is pressed onto the end surface of the adjusting pad which faces away from the bottom pad;

[0028] The adjusting pad is rotated so that the end surface of the adjusting pad facing away from the bottom pad is flush with the end surface of the flange portion facing away from the workbench.

[0029] In some embodiments, the workbench is provided with a plurality of lathe jaws; before the second fixing assembly is installed on the workbench, the method further comprises:

[0030] The lathe jaws are used to clamp the outer peripheral surface of the flange portion.

[0031] In some embodiments, after the guide vane portion is abutted against the end surface of the support block facing away from the workbench, and / or after the flange portion is abutted against the end surface of the support block facing away from the workbench, the method further includes:

[0032] An adjustment component is installed between the workbench and the diffuser; the adjustment component and the plurality of support pads are arranged in a circle.

[0033] In some embodiments, the adjustment assembly includes a support seat and an adjustment head threadedly connected to the support seat; the adjustment assembly is installed between the workbench and the diffuser, including:

[0034] Installing the support base on the workbench;

[0035] The adjusting head is rotated so that one end thereof facing away from the working table abuts against the end surface of the diffuser with a third pressure.

[0036] The beneficial effect of the diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant provided by the present application is that: by installing multiple support pads on a workbench and supporting the axial end face of the diffuser on the multiple support pads, the positioning error is reduced and the positioning effect of the axial end face of the diffuser is improved. At the same time, when the diffuser is clamped in the direction of the guide vane portion facing the workbench, multiple first fixing assemblies are installed on the workbench, and the cylinder portion of the diffuser is clamped by multiple first fixing assemblies to solve the problem that the guide vane portion is complex in shape and difficult to clamp. When the diffuser is clamped in a downward manner with the flange portion, multiple second fixing assemblies are installed on the workbench, and the multiple fixing assemblies apply downward axial pressure to the end face of the flange portion facing upward, and the flange portion is pressed and fixed, thereby improving the stability of the diffuser when it is clamped with the flange portion facing downward, thereby solving the problem of the difficulty of clamping the diffuser due to the complex structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 It is a structural schematic diagram of a diffuser in the background technology of this application;

[0039] Figure 2 A top view of a workbench of a vertical lathe in an embodiment of the present application;

[0040] Figure 3 This is a flow chart of the diffuser clamping method in an embodiment of the present application;

[0041] Figure 4 This is a top view of installing multiple support pads on a workbench in an embodiment of the present application;

[0042] Figure 5 This is a structural schematic diagram of a diffuser in an embodiment of the present application being clamped on a workbench through a first fixing assembly;

[0043] Figure 6 A cross-sectional view of a base of a first fixing assembly in an embodiment of the present application;

[0044] Figure 7 A partial view of a claw seat, a nut seat, a driving screw and a fixed claw of the first fixing assembly in an embodiment of the present application;

[0045] Figure 8 An exploded view of a claw seat, a nut seat, a driving screw and a fixed claw of the first fixing assembly in an embodiment of the present application;

[0046] Fig. 9 This is a schematic diagram of the structure in which the diffuser is clamped on the workbench by lathe claws in the embodiment of the present application;

[0047] Fig.10 This is a partial view of the diffuser in the embodiment of the present application being clamped on the workbench through the second fixing assembly.

[0048] Among them, the reference numerals in the figure are:

[0049] 10-diffuser; 11-flange; 12-barrel; 13-guide vane; 20-workbench; 21-T-slot; 22-lathe claw; 23-T-bolt; 24-T-nut; 30-first fixing assembly; 31-base; 311-bottom plate; 3111-connecting hole; 312-top plate; 3121-connecting groove; 313-rib plate; 32-fixing claw; 33-claw seat; 331-installation groove; 331a-first tank body; 331b-second tank body; 332-baffle ;333-mounting hole;34-driving screw;341-handle;35-nut seat;35a-first seat body;35b-second seat body;36-connecting bolt;40-second fixing assembly;41-bottom pad;411-connecting screw;42-pressure plate;43-adjusting pad;431-adjusting screw;44-pressure component;441-pressure screw;442-pressure nut;50-support pad;60-adjusting assembly;61-support seat;62-adjusting head;621-operating hole. DETAILED DESCRIPTION

[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] like Figure 1 As shown, the diffuser 10 includes a flange portion 11, a barrel portion 12 and a guide vane portion 13. The barrel portion 12 is hollow inside, and the flange portion 11 and the guide vane portion 13 are respectively arranged at the two ends of the barrel portion 12 in the axial direction. The flange portion 11, the barrel portion 12 and the guide vane portion 13 all have a plurality of mating surfaces for mating with other components in the main pump. The mating surfaces on the diffuser 10 will be deformed due to long-term stress after being used for a period of time, resulting in the size of the mating surface increasing or decreasing compared to the design size. The purpose of repairing the diffuser 10 can be achieved by measuring the dimensional deformation of each mating surface of the diffuser 10, cutting the mating surface, and restoring the dimensional accuracy of the mating surface, ensuring that the connection and coordination between the diffuser 10 and other components in the main pump meet the design requirements.

[0055] The processing equipment used for cutting and repairing the diffuser 10 can be a vertical lathe, or a milling machine, a grinder, or a multi-axis processing machine. The vertical lathe includes a machine body, a workbench 20, a vertical tool holder, and a side tool holder. The workbench 20 is connected to the machine body through a main shaft rotation. Figure 2 As shown, the upper surface of the workbench 20 has a plurality of T-slots 21 and a plurality of lathe claws 22. The vertical tool holder is vertically arranged above the workbench, and the side tool holder is horizontally arranged on one side of the workbench 20. Both the vertical tool holder and the side tool holder are used to install cutting tools. When repairing the diffuser 10, the diffuser 10 is installed on the workbench 20 with the axis vertical. The workbench 20 drives the diffuser 10 to rotate, and the cutting tools on the vertical tool holder or the side tool holder are used to cut the mating surfaces of the diffuser 10 to restore the dimensional accuracy of the diffuser 10.

[0056] Since there are many mating surfaces on the diffuser 10, the diffuser 10 can be first clamped on the workbench 20 with the guide vane portion 13 facing the workbench 20, and the mating surface facing the flange portion 11 can be cut and repaired. Then, the diffuser 10 can be clamped on the workbench 20 with the flange portion 11 facing the workbench 20, and the mating surface facing the guide vane portion 13 can be cut and repaired. When the guide vane portion 13 faces the workbench 20, due to the complex shape of the guide vane portion 13, it is impossible to directly use the lathe claws 22 on the workbench 20 to clamp and fix the peripheral side of the guide vane portion 13. When the flange portion 11 faces the workbench 20, due to the large height dimension of the diffuser 10 and the upward center of gravity, directly using the lathe claws 22 to clamp the outer peripheral surface of the flange portion 11 cannot ensure the stability of the diffuser 10. Therefore, the above two clamping methods for the diffuser 10 are both difficult and cannot be applied to the repair work of the diffuser 10.

[0057] The embodiment of the present application provides a diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant, wherein the diffuser 10 is clamped on the workbench 20 by using a fixing fixture in such a way that the guide vane portion 13 faces the workbench 20 or the flange portion 11 faces the workbench 20, and the fixing fixture includes a support pad 50, a first fixing assembly 30, and a second fixing assembly 40 for being installed on the workbench 20 and fixing the diffuser 10, so as to improve the positioning accuracy and clamping strength of the diffuser 10 on the workbench 20, and ensure the position stability and repair accuracy of the diffuser 10 during the cutting and repair process. In addition, the diffuser clamping method provided in the embodiment of the present application can also be applied to processing equipment such as milling machines, grinders, or multi-axis machining centers that can process and repair the diffuser 10, and is also applicable to other processing processes of the diffuser 10.

[0058] like Figure 3-Figure 10 As shown, the diffuser clamping method provided in the embodiment of the present application includes steps S101 to S105.

[0059] In step S101 , the support block 50 is installed on the workbench 20 .

[0060] The workbench 20 of the vertical lathe is arranged horizontally, and the support pad 50 is installed on the upper surface of the workbench 20. Figure 4 As shown, the support block 50 can be a circular block or a block structure of other shapes, and the bottom of the support block 50 can be fixed to the T-slot 21 on the workbench 20 by a T-bolt 23. The number of the support blocks 50 should be multiple, for example, the number of the support blocks 50 is four.

[0061] A plurality of support blocks 50 are arranged in a circle around the rotation axis of the workbench 20. The plurality of support blocks 50 can be sequentially installed on the workbench 20 in a clockwise direction or a counterclockwise direction. The size of the support blocks 50 and the circular distribution radius of the plurality of support blocks 50 should match the radius size of the end faces on both sides of the diffuser 10. The top of the support block 50 is a plane. The tops of the plurality of support blocks 50 are flush to form a horizontal positioning surface together, so that the end faces of the flange portion 11 and the guide vane portion 13 of the diffuser 10 can both abut against the tops of the plurality of support blocks 50. The diffuser 10 is supported above the workbench 20 by the plurality of support blocks 50. Compared with directly using the surface of the workbench 20 to abut against the axial end face of the diffuser 10, the contact area of ​​the axial end face of the diffuser 10 is reduced, and the positioning error generated is smaller.

[0062] In some embodiments, after the support block 50 is installed on the workbench 20 , the diffuser clamping method may further include: cutting the end surface of the support block 50 facing away from the workbench 20 .

[0063] Specifically, the cutting tool on the vertical lathe can be used to cut the top of the support pad 50. When cutting the support pad 50, the vertical lathe is started to rotate the worktable 20, and the cutting tool is controlled to pass through the top of each support pad 50 to cut the top of all the support pads 50 at the same time, thereby ensuring that the top of each support pad 50 is flush, eliminating the installation error generated during the installation of the support pad 50, and making the plane accuracy of the positioning surface formed by the tops of multiple support pads 50 higher, further improving the positioning accuracy of the axial end face of the diffuser 10.

[0064] In step S102 , the guide vane portion 13 of the diffuser 10 is brought into contact with the end surface of the support block 50 facing away from the workbench 20 .

[0065] Specifically, the diffuser 10 can be lifted and moved to the top of the support block 50 by using an overhead crane or other lifting equipment in the workshop, and then slowly lowered so that the guide vane portion 13 of the diffuser 10 is precisely in contact with the top of the support block 50. During the lowering process of the diffuser 10, adjustments are made according to the relative positions of the diffuser 10 and the plurality of support blocks 50. For example, the diffuser 10 stops moving when the distance between the diffuser 10 and the support block 50 is relatively close. After fine-tuning the relative positions of the diffuser 10 and the support blocks 50, the diffuser 10 is moved downward continuously to ensure that the downward end surface of the guide vane portion 13 is in uniform contact with the end surface of the support block 50 to avoid tilting or offset. The diffuser 10 is stably supported on the workbench 20 with the guide vane portion 13 facing downward using the plurality of support blocks 50.

[0066] In step S103 , the first fixing assembly 30 is installed on the workbench 20 , and the first fixing assembly 30 is used to apply a radial force to the barrel portion 12 of the diffuser 10 .

[0067] like Figure 5 As shown, the number of first fixing assemblies 30 is also multiple, and the multiple first fixing assemblies 30 can also be arranged in a circle on the workbench 20 around the axis of the workbench 20, and are arranged around the circumference of the diffuser 10. Multiple first fixing assemblies 30 are used to apply radial forces to different positions of the barrel portion 12 respectively, so as to fix the diffuser 10 on the workbench 20 by clamping the barrel portion 12, thereby solving the problem that the guide vane portion 13 cannot be clamped, so that the diffuser 10 can be stably clamped on the workbench 20 with the guide vane portion 13 facing downward.

[0068] The installation order of the plurality of first fixing assemblies 30 can be arbitrary. For example, two or more of the first fixing assemblies 30 can be installed first, and after the diffuser 10 is hoisted onto the support pad 50, the remaining first fixing assemblies 30 can be installed. On the one hand, the plurality of first fixing assemblies 30 installed first are used to locate the hoisting position of the diffuser 10. On the other hand, sufficient hoisting operation space is reserved for the diffuser 10, so as to facilitate adjustment of the position of the diffuser 10 during the hoisting process of the diffuser 10. In addition, after the position of the diffuser 10 is determined, the relative position of each first fixing assembly 30 and the diffuser 10 can be adjusted again so that each fixing claw 32 is aligned with the barrel portion 12 of the diffuser 10.

[0069] like Figure 6-Figure 8 As shown, in some embodiments, the first fixing assembly 30 may include a base 31, a fixed claw 32, a claw seat 33, a driving screw 34 and a nut seat 35, the base 31 is mounted on the workbench 20, the claw seat 33 is connected to the side of the base 31 facing away from the workbench 20, the driving screw 34 is arranged along the first direction and is rotatably connected to the claw seat 33, the nut seat 35 is slidably connected to the claw seat 33 along the first direction, and the nut seat 35 is threadedly connected to the driving screw 34, and the fixed claw 32 is connected to the nut seat 35 so as to be able to slide along the first direction. The first direction is the radial direction of the diffuser.

[0070] The shape of the base 31 can be arbitrary, for example Figure 4 As shown, the base 31 may include a bottom plate 311, a top plate 312 and a plurality of ribs 313, the bottom plate 311 and the top plate 312 are both arranged horizontally, the plurality of ribs 313 are arranged at intervals between the bottom plate 311 and the top plate 312, the ribs 313 may be arranged vertically or tilted, and the upper and lower ends of the ribs 313 are respectively connected to the bottom plate 311 and the top plate 312 to form a structurally stable base 31. The bottom plate 311 may be provided with a connecting hole 3111 so that the bottom plate 311 can be fixed to the T-slot 21 of the workbench 20 using a T-bolt 23.

[0071] The claw seat 33 may be a rectangular block structure, and the claw seat 33 is arranged on the top plate 312 along the radial direction of the diffuser 10. The claw seat 33 is used to support the driving screw 34, the nut seat 35 and the fixed claw 32, so as to realize the sliding of the fixed claw 32 in the first direction. The claw seat 33 and the base 31 may be connected by a fastener, for example, two connecting grooves 3121 are provided on the top plate 312, and the cross-sectional shape of the connecting grooves 3121 may be T-shaped. The claw seat 33 is provided with a plurality of mounting holes 333 at positions corresponding to the two connecting grooves 3121, so that the claw seat 33 can be fixed on the top plate 312 using connecting bolts 36.

[0072] The driving screw 34 is a rod-shaped component with a certain length of thread on the outer surface. A bearing seat may be provided on the claw seat 33. The driving screw 34 is rotatably connected to the claw seat 33 through the bearing seat, so that the driving screw 34 can rotate around its own axis. A handle 341 may also be provided at one end of the driving screw 34 to facilitate the control of the rotation of the driving screw 34.

[0073] The claw seat 33 may be provided with a mounting groove 331, which is arranged along the first direction. The mounting groove 331 is a containing structure with a certain space. The mounting groove 331 is arranged through the length direction of the claw seat 33, and the mounting groove 331 has openings at the top and the side of the claw seat 33. The cross section of the nut seat 35 is the same as the cross section of the mounting groove 331. The nut seat 35 can slide into the mounting groove 331 through the side opening and can slide along the opening direction of the mounting groove 331. The driving screw 34 is arranged in the mounting groove 331. The nut seat 35 is provided with a threaded hole that matches the driving screw 34. The driving screw 34 is inserted into the threaded hole to achieve threaded matching with the nut seat 35. When the driving screw 34 rotates, the nut seat 35 can slide along the axial direction of the driving screw 34. A baffle 332 may be installed at the opening of the claw seat 33 on one side of the installation slot 331 to close the side opening of the installation slot 331 , thereby protecting and limiting the components in the installation slot 331 .

[0074] The nut seat 35 can be connected to the fixed claw 32 through the top opening of the mounting groove 331, so that the fixed claw 32 can be driven to slide by the rotation of the driving screw 34. The shape of the fixed claw 32 can also be arbitrary, and the end of the fixed claw 32 facing the diffuser 10 can be provided with a matching structure that matches the outer peripheral surface of the barrel 12, such as a V-shaped groove or an arc groove.

[0075] The method of installing the first fixing assembly 30 on the workbench 20 and applying radial force to the barrel portion 12 of the diffuser 10 using the first fixing assembly 30 may include:

[0076] The base 31 is mounted on the workbench 20 so that the height of the fixing claw 32 matches the height of the barrel 12;

[0077] The fixing claw 32 is slid toward the side of the cylindrical portion 12 so that the fixing claw 32 is pressed against the outer peripheral surface of the cylindrical portion 12 with a first pressure.

[0078] Specifically, when the base 31 is installed on the workbench 20, the T-bolt 23 can be pre-embedded in the T-slot 21 corresponding to the workbench 20, and then the first fixing assembly 30 is hoisted onto the workbench 20 as a whole using an overhead crane or other lifting equipment, so that the T-bolt 23 is inserted into the connection hole 3111 corresponding to the base 31, and then the nut is used to lock the base 31. The height of the base 31 matches the height of the barrel 12 when the guide vane 13 of the diffuser 10 is facing downward, so that the height of the fixing claw 32 is supported at the barrel 12.

[0079] After the base 31 is fixed to the workbench 20, the axial direction of the driving screw 34 is parallel to the radial direction of the diffuser 10, and the fixed claw 32 faces the barrel 12 of the diffuser 10. The driving screw 34 is rotated to move the fixed claw 32 toward the barrel 12 until the fixed claw 32 abuts against the outer circumferential surface of the barrel 12, so that the fixed claw 32 applies a radial force to the barrel 12.

[0080] In some embodiments, before sliding the fixing claw 32 toward one side of the barrel portion 12, a first fixing assembly 30 is installed on the workbench 20, and the method of using the first fixing assembly 30 to apply radial force to the barrel portion 12 of the diffuser 10 may also include: installing a protective gasket at one end of the fixing claw 32 facing the barrel portion 12.

[0081] Specifically, the protective gasket can be made of a metal material or non-metallic material with a relatively low hardness such as copper, and the shape of the protective gasket matches the outer surface of the barrel portion 12. The protective gasket can be clamped between the fixed claw 32 and the barrel portion 12, or can be pre-fixed to the end of the fixed claw 32 facing the barrel portion 12 by bonding, fastener connection, etc. Under the action of the protective gasket, the damage to the barrel portion 12 caused by the fixed claw 32 when applying radial force can be reduced, thereby protecting the barrel portion 12.

[0082] In summary, by using the first fixing assembly 30 to clamp the diffuser 10 on the workbench 20 with the flange 11 facing upward, the cutting and repairing work can be performed on the multiple mating surfaces on the flange 11 and the mating surfaces on the barrel 12 facing or close to the flange 11. After the repair of these mating surfaces is completed, the repaired diffuser 10 can be temporarily stored in a designated location to wait for subsequent processes or use according to process requirements, and the diffuser 10 can be turned over 180° in step S104 so that the guide vane 13 of the diffuser 10 faces upward, so as to continue to cut and repair the multiple mating surfaces on the guide vane 13 and the multiple mating surfaces on the barrel 12 facing or close to the guide vane 13.

[0083] In step S104 , the flange portion 11 of the diffuser 10 is brought into contact with the end surface of the support block 50 facing away from the workbench 20 .

[0084] Specifically, the diffuser 10 can also be lifted and moved to the top of the support pad 50 by using an overhead crane or other lifting equipment in the workshop, and then slowly lowered so that the flange 11 of the diffuser 10 is precisely in contact with the top of the support pad 50. During the lowering process of the diffuser 10, the position of the diffuser 10 is adjusted according to the relative positions of the diffuser 10 and the plurality of support pads 50. For example, the diffuser 10 stops moving when the distance between the diffuser 10 and the support pad 50 is relatively close. After fine-tuning the relative positions of the diffuser 10 and the support pads 50, the diffuser 10 continues to move downward to ensure that the downward end surface of the flange 11 is in uniform contact with the end surface of the support pad 50 to avoid tilting or offset. The diffuser 10 is stably supported on the workbench 20 with the flange 11 facing downward using the plurality of support pads 50.

[0085] In step S105 , the second fixing assembly 40 is installed on the workbench 20 , and the second fixing assembly 40 is used to apply an axial pressure toward the workbench 20 to the flange portion 11 of the diffuser 10 .

[0086] like Fig. 9 and Fig.10 As shown, the number of the second fixing assemblies 40 is also multiple, for example, the number of the second fixing assemblies 40 is four. The multiple second fixing assemblies 40 can also be arranged in a circle around the axis of the workbench 20, and the multiple second fixing assemblies 40 surround the circumference of the flange portion 11 and apply downward axial pressure to the upward end surface of the flange portion 11 to compress and fix the flange portion 11, thereby improving the stability of the diffuser 10 when the flange portion 11 is clamped downward.

[0087] In some embodiments, the second fixing assembly 40 may include a bottom pad 41, a pressure plate 42 and a pressure component 44. The bottom pad 41 is connected to the workbench 20, the pressure plate 42 is against the side of the bottom pad 41 facing away from the workbench 20, and the pressure component 44 is connected to the workbench 20 and connected to the pressure plate 42, and is used to apply pressure to the pressure plate 42 toward the workbench 20.

[0088] The method of installing the second fixing assembly 40 on the workbench 20 and applying axial pressure toward the workbench 20 to the flange portion 11 of the diffuser 10 by using the second fixing assembly 40 includes:

[0089] Install the bottom pad 41 on the workbench 20;

[0090] One end of the pressing plate 42 is pressed on the side of the bottom pad 41 facing away from the workbench 20, and the other end is pressed on the end surface of the flange portion 11 facing away from the workbench 20;

[0091] The pressure member 44 is mounted on the table 20 , and applies axial pressure to the pressure plate 42 in the direction of the flange portion 11 .

[0092] Specifically, a threaded hole may be provided on the bottom surface of the bottom pad 41. When the bottom pad 41 is installed on the workbench 20, the connecting screw 411 is screwed into the bottom threaded hole of the bottom pad 41, and the T-nut 24 is embedded in the corresponding position of the T-slot 21. The bottom of the connecting screw 411 is screwed into the T-nut 24, so that the bottom surface of the bottom pad 41 is fitted with the upper surface of the workbench 20 to fix the bottom pad 41 on the workbench 20.

[0093] The height of the bottom pad 41 can be adapted according to the height of the upper end face of the flange 11. The pressing plate 42 is a flat plate structure with a certain length. The length of the pressing plate 42 is greater than the width of the bottom pad 41. The pressing plate 42 is placed above the bottom pad 41 along the radial direction of the diffuser 10, and one side of the pressing plate 42 is pressed against the upper end face of the flange 11. After the pressing plate 42 is placed, a downward pressure is applied to the pressing plate 42 using a pressure component 44, so that a downward axial pressure is applied to the flange 11 through the pressing plate 42, and the flange 11 is pressed against the workbench 20 under the action of the plurality of second fixing components 40.

[0094] In some embodiments, the pressure component 44 may include a pressure screw 441 and a pressure nut 442. One end of the pressure screw 441 is connected to the workbench 20. The pressure plate 42 is provided with a through hole 421 for the pressure screw 441 to penetrate. The pressure nut 442 is threadedly connected to the pressure screw 441.

[0095] The method of installing the pressure component 44 on the workbench 20 and applying axial pressure to the pressure plate 42 in the direction of the flange portion 11 may include:

[0096] The pressure screw 441 is passed through the through hole 421 on the pressure plate 42 and installed on the workbench 20;

[0097] The pressure nut 442 is connected to the pressure screw 441 , and a second pressure is applied to the side of the pressure plate 42 facing away from the flange portion 11 .

[0098] Specifically, the pressure screw 441 can be installed vertically on the workbench 20, and the T-nut 24 can be pre-embedded at the corresponding position in the T-slot 21. The position of the T-nut 24 is opposite to the position of the through hole 421 on the pressure plate 42. The pressure screw 441 passes through the through hole 421 from top to bottom and is screwed into the T-nut 24 to achieve the connection and fixation between the pressure screw 441 and the workbench 20. After the pressure screw 441 is fixed, the pressure nut 442 is screwed in from the top of the pressure screw 441, and the pressure nut 442 is rotated to make it abut against the upper surface of the pressure plate 42, so as to apply pressure to the pressure plate 42 toward one side of the workbench 20, and then the flange portion 11 is applied with downward axial pressure through the pressure plate 42.

[0099] The pressure screw 441 may be installed between the bottom pad 41 and the diffuser 10 to be close to the contact portion between the pressure plate 42 and the flange portion 11 , so as to better apply downward pressure to the flange portion 11 through the pressure plate 42 .

[0100] In some embodiments, the second fixing assembly 40 may further include an adjusting pad 43 , which is located between the bottom pad 41 and the pressure plate 42 . An adjusting screw 431 is provided at one end of the adjusting pad 43 facing the bottom pad 41 , and the adjusting screw 431 is threadedly connected to the bottom pad 41 .

[0101] Before the pressure nut 442 is pressed against the side of the pressure plate 42 facing away from the flange portion 11 with a second pressure, the second fixing assembly 40 is installed on the workbench 20, and the method of using the second fixing assembly 40 to apply an axial pressure toward the workbench 20 to the flange portion 11 of the diffuser 10, further includes:

[0102] The pressing plate 42 is pressed onto the end surface of the adjusting pad 43 facing away from the bottom pad 41;

[0103] The spacer block 43 is rotated and adjusted so that the end surface thereof facing away from the bottom spacer block 41 is flush with the end surface of the flange portion 11 facing away from the workbench 20 .

[0104] It is understandable that there will be installation errors when the bottom pad 41 is installed on the workbench 20, and it cannot be guaranteed that the top of the bottom pad 41 is completely flush with the upward end surface of the flange portion 11, resulting in the pressure plate 42 being unable to accurately apply pressure to the flange portion 11.

[0105] By setting the adjusting pad 43 on the top of the bottom pad 41, after placing the pressure plate 42, the adjusting pad 43 can be rotated according to the horizontality of the pressure plate 42 to change the top height of the adjusting pad 43, and the top height of the adjusting pad 43 can be adjusted to be flush with the upper end surface of the flange part 11, thereby ensuring that the pressure plate 42 is arranged horizontally and accurately applies pressure to the flange part 11.

[0106] like Fig. 9As shown, in some embodiments, before installing the second fixing assembly 40 on the workbench 20 , the diffuser clamping method further includes: using a lathe jaw 22 to clamp the outer peripheral surface of the flange portion 11 .

[0107] By applying radial force to the flange portion 11 through multiple lathe jaws 22, the position of the diffuser 10 can be centered, and the coaxiality of the axis of the diffuser 10 and the rotation axis of the workbench 20 can be better. In addition, with the combined action of the second fixing component 40 applying pressure to the flange portion 11, it can ensure that the diffuser 10 remains stable during the processing and avoid a decrease in processing accuracy due to vibration or movement.

[0108] A protective gasket may also be disposed between the lathe jaws 22 and the outer circumference of the flange portion 11 to protect the outer circumference of the flange portion 11 .

[0109] It should be noted that in this embodiment, there is no restriction on the clamping sequence of the diffuser 10. Steps S102 and S103 may be performed first to clamp the diffuser 10 on the workbench 20 with the guide vane portion 13 facing downward. After repairing the mating surface of the diffuser 10 facing the flange portion 11, the first fixing assembly 30 on the workbench 20 is removed, the diffuser 10 is lifted from the support pad 50, and the diffuser is flipped 180° using a flipping device, and then steps S104 and S105 are performed to clamp the diffuser 10 on the workbench 20 with the flange portion 11 facing downward. Of course, steps S104 and S105 may also be performed first to clamp the diffuser 10 on the workbench 20 with the flange portion 11 facing downward, and then steps S103 and S103 are performed to clamp the diffuser 10 on the workbench 20 with the guide vane portion 13 facing downward.

[0110] like Figure 5 and Fig. 9 As shown, in some embodiments, after the guide vane portion 13 of the diffuser 10 is abutted against the end surface of the support block 50 facing away from the workbench 20, and / or after the flange portion 11 of the diffuser 10 is abutted against the end surface of the support block 50 facing away from the workbench 20, it also includes: installing an adjustment assembly 60 between the workbench 20 and the diffuser 10.

[0111] After the diffuser 10 is supported on the workbench 20 by the support pad 50, in the subsequent measurement and positioning process, the plane runout value of the upper end surface of the diffuser 10 is measured, and the clamping position of the diffuser 10 is finely adjusted according to the change of the plane runout value to minimize the plane runout value of the upper end surface of the diffuser 10. The adjustment component 60 is a structure that can change the distance between the diffuser 10 and the workbench 20. By installing the adjustment component 60 between the diffuser 10 and the workbench 20, the height of the corresponding position of the diffuser 10 can be changed by using the adjustment component 60 to achieve the purpose of fine-tuning the clamping position of the diffuser 10.

[0112] Specifically, when the diffuser 10 is clamped on the workbench 20 with the guide vane portion 13 facing downward, the adjustment assembly 60 should be installed between the workbench 20 and the guide vane portion 13; when the diffuser 10 is clamped on the workbench 20 with the flange portion 11 facing downward, the adjustment assembly 60 should be installed between the workbench 20 and the flange portion 11. The number of the adjustment assembly 60 can be one or more, and can be adapted to the requirements of the alignment process of the upper end surface of the diffuser 10. The installation position of the adjustment assembly 60 should be arranged in a circular shape together with the multiple support pads 50 to accurately abut against the lower end surface of the diffuser 10. The adjustment assembly 60 can be installed on the workbench 20 together with the support pads 50, or it can be installed on the workbench 20 after the clamping position of the diffuser 10 is determined.

[0113] like Fig.10 As shown, in some embodiments, the adjustment assembly 60 may include a support seat 61 and an adjustment head 62. The top and bottom of the support seat 61 may be provided with threaded holes, and the bottom of the adjustment head 62 is provided with external threads so that the bottom of the adjustment head 62 is threadedly connected to the support seat 61.

[0114] The method of installing the adjustment assembly 60 between the workbench 20 and the diffuser 10 may include:

[0115] Install the support base 61 on the workbench 20;

[0116] The adjusting head 62 is rotated so that one end thereof facing away from the working table 20 is pressed against the end surface of the diffuser 10 with a third pressure.

[0117] Specifically, the T-bolt 23 can be inserted into the T-slot 21 of the workbench 20 in advance, and then the threaded hole at the bottom of the support seat 61 is screwed into the stud of the T-bolt 23, and the bottom of the support seat 61 is abutted against the upper surface of the workbench 20, so that the support seat 61 and the workbench 20 are relatively fixed. The adjustment head 62 can be provided with an operation hole 621, and the operator can use a tool such as a wrench to insert into the operation hole 621, drive the adjustment head 62 to rotate relative to the support seat 61, and move the adjustment head 62 toward the side of the diffuser 10 until it abuts against the downward end surface of the diffuser 10.

[0118] When subsequently adjusting the plane runout value of the upper end surface of the diffuser 10 , the height of the corresponding position of the diffuser 10 can be adjusted by rotating the adjustment head 62 so that the plane runout value of the upper end surface of the diffuser 10 meets the process requirements.

[0119] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for clamping a diffuser for repairing a hydraulic component of a nuclear power plant main pump, wherein a fixing fixture is used to clamp the diffuser on a workbench of a processing equipment, wherein the diffuser comprises a flange portion, a barrel portion and a guide vane portion, and is characterized in that: The fixing fixture comprises a support pad, a first fixing assembly and a second fixing assembly for being mounted on the workbench and fixing the diffuser. The diffuser clamping method comprises: Install support pads on the workbench; the number of the support pads is multiple and arranged in a circular shape; The guide vane portion is brought into contact with the end surface of the support block facing away from the workbench; A first fixing assembly is installed on the workbench, and a radial force is applied to the cylinder portion by using the first fixing assembly; a plurality of the first fixing assemblies are arranged around the circumference of the diffuser; The flange is brought into contact with the end surface of the support block facing away from the workbench; and / or: A second fixing component is installed on the workbench, and the second fixing component is used to apply an axial pressure toward the workbench to the flange portion; the number of the second fixing components is multiple and they are arranged around the periphery of the diffuser.

2. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 1 is characterized in that: After the support pad is installed on the workbench, the method further comprises: Cut the end surface of the support block facing away from the workbench.

3. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 1 is characterized in that: The first fixing assembly includes a base and a fixing claw slidably connected to the base; the first fixing assembly is installed on the workbench, and the first fixing assembly is used to apply a radial force to the barrel portion, including: Installing the base on the workbench; The fixing claw is slid toward one side of the cylindrical portion so that the fixing claw abuts against the outer peripheral surface of the cylindrical portion with a first pressure.

4. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 3 is characterized in that: Before sliding the fixing claw toward one side of the barrel, the method further comprises: A protective gasket is installed on one end of the fixing claw facing the cylindrical body.

5. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 1 is characterized in that: The second fixing assembly comprises a bottom pad, a pressure plate pressed on the bottom pad, and a pressure component for applying pressure to the pressure plate; the second fixing assembly is installed on the workbench, and the second fixing assembly is used to apply axial pressure to the flange portion toward the workbench, including: Installing the bottom pad on the workbench; One end of the pressing plate is pressed on a side of the bottom pad facing away from the workbench, and the other end is pressed on an end surface of the flange portion facing away from the workbench; The pressure component is mounted on the workbench to apply axial pressure to the pressure plate in a direction toward the flange portion.

6. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 5 is characterized in that: The pressure component includes a pressure screw and a pressure nut threadedly connected to the pressure screw, and the pressure plate is provided with a through hole for the pressure screw to pass through; the second fixing component is installed on the workbench, and the second fixing component is used to apply axial pressure to the flange portion toward the workbench, including: Passing the pressure screw through the through hole on the pressing plate and installing it on the workbench; The pressure nut is connected to the pressure screw and abuts against a side of the pressure plate facing away from the flange portion with a second pressure.

7. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to claim 6 is characterized in that: The second fixing assembly further includes an adjusting pad, which is threadedly connected to the bottom pad; before the pressure nut is connected to the pressure screw and the second pressure is applied to the side of the pressure plate facing away from the flange, it also includes: The pressing plate is pressed onto the end surface of the adjusting pad which faces away from the bottom pad; The adjusting pad is rotated so that the end surface of the adjusting pad facing away from the bottom pad is flush with the end surface of the flange portion facing away from the workbench.

8. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to any one of claims 1 to 7, characterized in that: The workbench is provided with a plurality of lathe claws; before the second fixing assembly is installed on the workbench, the method further comprises: The lathe jaws are clamped to the outer peripheral surface of the flange portion using a plurality of the lathe jaws.

9. The diffuser clamping method for repairing the hydraulic components of the main pump of a nuclear power plant according to any one of claims 1 to 7, characterized in that: After the guide vane portion is abutted against the end surface of the support block facing away from the workbench, and / or after the flange portion is abutted against the end surface of the support block facing away from the workbench, the method further includes: An adjustment component is installed between the workbench and the diffuser; the adjustment component and the plurality of support pads are arranged in a circle.

10. The diffuser clamping method for repairing hydraulic components of a nuclear power plant main pump according to claim 9, characterized in that: The adjustment assembly includes a support seat and an adjustment head threadedly connected to the support seat; The adjusting assembly is installed between the workbench and the diffuser, comprising: Installing the support base on the workbench; The adjusting head is rotated so that one end thereof facing away from the working table abuts against the end surface of the diffuser with a third pressure.

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