Nuclear power plant containment insert plate installation welding device and method

Abstract

Provided are a nuclear power plant containment insert plate installation and welding device and method, which comprise a track, a walking mechanism and a welding assembly, the track is adsorbed to the surface of the containment by a magnetic adsorption assembly; the walking mechanism is installed on the track and comprises a walking driving shaft and a clutch mechanism, the walking driving shaft is engaged with the track so that the walking mechanism can travel along the track, the clutch mechanism comprises a walking motor, the walking motor is arranged to enable the walking driving shaft to be switched to a rotating state or a stopped state; the welding assembly comprises an arc pressure automatic adjustment mechanism, a welding gun bearing seat and a wire guide frame, the welding gun bearing seat and the wire guide frame are jointly installed on the arc pressure automatic adjustment mechanism, and the arc pressure automatic adjustment mechanism is connected with the walking mechanism. The installation and welding device directly adsorbs to the surface of the containment cylinder by the magnetic adsorption assembly, is more flexible, and completely decouples the device from the sleeve and the insert plate to be installed, thereby improving the quality of the weld.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant construction, and more specifically to the field of welding apparatus and method for installing containment insert plates in nuclear power plants. Background Technology

[0002] Electrical penetrations are the core electrical connection equipment of the steel containment vessel of a nuclear power plant. They bear the important responsibility of ensuring reliable connection between the electrical systems inside and outside the containment vessel and have extremely high requirements for sealing and structural stability.

[0003] Welding operations are generally divided into two parts: welding the sleeve to the insert plate and welding the insert plate to the containment shell. The latter is more difficult to weld due to its double-bevel design.

[0004] Currently, the industry generally relies on manual argon arc welding, which suffers from inconsistent quality, low efficiency, and high on-site risks. Therefore, an automated welding device is needed to achieve automated and efficient welding.

[0005] For example, Chinese patent CN121178967A discloses a device for automatic welding of insert plates for CV electrical penetration parts in AP reactor type nuclear power plants. This device achieves overall fixation of the device by tightening the sleeve inside the positioning mechanism, and uses a clutch structure set on the chassis structure to drive the connecting rod, linear guide rail and sliding plate with Z-shaped and L-shaped guide grooves to move by adjusting the handle, so that the drive unit and the wheel frame move synchronously to achieve clutch.

[0006] However, the inventors discovered several problems with this device during use: for example, stable welding of the device depends on the stability of the positioning mechanism inside the sleeve, which requires the insertion plate to be pre-fixed to the containment shell via spot welding or other methods to provide a stable load-bearing point. However, during welding, the welding equipment continuously applies a large force to the sleeve, which significantly affects the weld quality. Moreover, this fixing method is only suitable for sleeves installed vertically on the containment shell. Once the containment shell and the sleeve axis form an angle, this method becomes inconvenient to use, and the latter often occurs in actual welding processes. Summary of the Invention

[0007] One object of the present invention is to provide a welding device for installing containment plate in nuclear power plants, which has better welding effect and a wider range of applications.

[0008] A nuclear power plant containment vessel insert plate installation welding device for welding insert plates onto the containment vessel to achieve the above objectives includes a track, a traveling mechanism, and a welding assembly. The track is magnetically attached to the surface of the containment vessel via a magnetic traction assembly. The traveling mechanism is mounted on the track and includes a travel drive shaft and a clutch mechanism. The travel drive shaft engages with the track to enable the traveling mechanism to travel along the track. The clutch mechanism includes a traveling motor, which is configured to switch the travel drive shaft between a rotating state and a stopped state. The welding assembly includes an automatic arc voltage adjustment mechanism, a welding torch support, and a wire guide. The welding torch support and the wire guide are jointly mounted on the automatic arc voltage adjustment mechanism, which is connected to the traveling mechanism.

[0009] In one or more embodiments, the clutch mechanism further includes a bevel gear set, through which the travel motor meshes with the travel drive shaft; the travel motor is movably configured to move its own position to put the bevel gear set into an engaged or disengaged state.

[0010] In one or more embodiments, the travel drive shaft includes a first conical tooth at the top and a travel gear at the bottom, the track is provided with a gear ring that meshes with the travel gear, and the travel motor includes a second conical tooth at the end of the output shaft, the second conical tooth and the first conical tooth forming the bevel gear set.

[0011] In one or more embodiments, the device further includes a support plate disposed on the track, the traveling mechanism being disposed on the support plate, and the traveling drive shaft passing through the support plate.

[0012] In one or more embodiments, the clutch mechanism further includes a positioning element and a bracket, the bracket being used to support the travel motor, the bracket being movably mounted on the support plate, and the positioning element being used to fix the position of the bracket.

[0013] In one or more embodiments, the walking mechanism includes a housing, the walking motor, the positioning element and the bracket are located inside the housing, the bracket includes a pin hole, the housing includes a through hole, and the positioning element is a positioning pin inserted into the pin hole and the through hole.

[0014] In one or more embodiments, the track includes a first guide rail and a second guide rail stacked together. The first guide rail provides an external gear ring that meshes with the traveling gear. The support plate is also provided with a plurality of guide pulleys. The second guide rail provides a guide rail that cooperates with the guide pulleys.

[0015] In one or more embodiments, the support plate and the housing are connected by a quick-release structure.

[0016] In one or more embodiments, the track includes multiple sub-track modules connected to each other, each sub-track module having the same or different shapes, and each sub-track module having adjustable legs at its bottom for adjusting the distance of the track relative to the edge of the insertion plate and / or the spacing of the track relative to the surface of the containment shell.

[0017] In one or more embodiments, the adjustable support leg includes an extension convex plate, an axial rod, and a movable block. A magnet is disposed at the bottom of the adjustable support leg. The extension convex plate is detachably disposed at the bottom of the track. The axial rod is disposed on the extension convex plate. The movable block is movably connected to the axial rod. The magnet is disposed on the movable block.

[0018] In one or more embodiments, the automatic arc voltage adjustment mechanism includes a controller and a lifting component. The lifting component is connected to the welding torch support and the wire guide. The controller is used to monitor the arc voltage value during the welding process in real time, compare it with a preset target arc voltage value to obtain a deviation signal, and control the lifting component to adjust the distance between the welding torch on the welding torch support and the weld surface according to the deviation signal.

[0019] Another objective of this invention is to provide a method for welding the installation of a containment insert plate in a nuclear power plant, comprising the following steps: determining a welding path; connecting a traveling mechanism to a welding assembly and installing the traveling mechanism on the track; placing the traveling mechanism in a traveling state on the track, thereby driving the welding assembly to travel along the track and enabling the welding torch to perform welding; and adjusting the position and height of the track in real time during the welding process according to the weld location and the curvature of the containment cylinder surface.

[0020] In one or more embodiments, the weld seam on the outside of the containment shell is welded first. After the single-sided welding is completed, the insert plate is removed, the welding device is installed and re-fixed to the inside of the containment shell, and the weld seam on the inside of the containment shell is welded.

[0021] The aforementioned installation and welding device uses magnetic components to directly adhere to the surface of the containment shell, which is not only more flexible, but also completely decouples the device from the sleeve and insert plate to be installed, eliminating reliance on the sleeve and insert plate for support and positioning, thus improving the quality of the weld. Attached Figure Description

[0022] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram showing the sleeve axis perpendicular to the containment shell. Figure 2 This is a schematic diagram showing the acute angle formed between the sleeve axis and the containment shell. Figure 3 This is a schematic diagram of the insertion plate mounting welding device, track, and insertion plate; Figure 4 This is an overall schematic diagram of the insertion plate mounting welding device and track; Figure 5 This is a partial bottom view of the welding equipment; Figure 6 This is a schematic diagram of the support plate; Figure 7 This is a schematic diagram of the track, support plate, and welding components; Figure 8 This is a schematic diagram of the bearing plate and the clutch mechanism; Figure 9 This is a schematic diagram of the walking mechanism; Figure 10 This is a front view of the bevel gear set in the meshing state; Figure 11 This is a front view of the bevel gear set in the disengaged state; Figure 12 This is a schematic diagram of the automatic arc voltage adjustment mechanism; Figure 13 This is a schematic diagram of the wire guide frame mechanism; Figure 14 This is a schematic diagram of the walking mechanism and welding components.

[0023] Explanation of reference numerals in the attached figures

[0024] 1-Containment shell

[0025] 2-Insert plate

[0026] 3-sleeve

[0027] 10-Walking Mechanism

[0028] 11-orbit

[0029] 11a-First guide rail

[0030] 11b-Second guide rail

[0031] 12-Welding Components

[0032] 13-Clutch Mechanism

[0033] 14-Automatic Arc Voltage Adjustment Mechanism

[0034] 16-Travel drive shaft

[0035] 15-Wire guide frame

[0036] 17-Welding torch support

[0037] 19-Slider

[0038] 20-Insert plate edge

[0039] 31-L type mounting plate

[0040] 32-Spherical handle

[0041] 33-Plate

[0042] 34-Pin Hole

[0043] 35-Positioning component

[0044] 100-Shell

[0045] 101-Extension Convex Plate

[0046] 102-Axial rod

[0047] 103-Moving Block

[0048] 107-Cross-shaped hole

[0049] 111-Adjustable outriggers

[0050] 112-Magnet

[0051] 116-Guide rail

[0052] 117-External Gear Ring

[0053] 118-Sub-track Module

[0054] 119-Insertion Ring

[0055] 130-Walking Motor

[0056] 133-Output Shaft

[0057] 134 - Second conical tooth

[0058] 141-Lifting Component

[0059] 142-lead screw

[0060] 143-Connecting Block

[0061] 144-Arc Voltage Motor

[0062] 145 - First Synchronizing Pulley

[0063] 146-Synchronous Belt

[0064] 147 - Second Synchronization Pulley

[0065] 150-Bearing Plate

[0066] 151-Guide Pulley

[0067] 152-Angle Adjustment Mechanism

[0068] 153-Quick-release structure

[0069] 154-Wire guide frame connector

[0070] 155-Protrusion Block

[0071] 156-Up and down adjustment mechanism

[0072] 158-Screw

[0073] 159-Wire Feeding Tube

[0074] 161-First conical tooth

[0075] 162-Traveling Gear

[0076] 192-Swing Mechanism

[0077] 194-Splitter Box

[0078] A-Welding torch

[0079] B-welding wire Detailed Implementation

[0080] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0081] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0082] Figure 1 and Figure 2 The diagram shows a partial cross-sectional view of the installation environment of the electrical penetration device. Insertion plate 2 is welded to the containment shell 1, and then the electrical penetration device is inserted into sleeve 3 to penetrate the containment shell. The electrical penetration device is a core electrical connection device within the steel containment structure of a nuclear power plant. Its structural design and installation quality directly affect the operational safety of the nuclear reactor and must meet extremely high requirements for sealing performance and structural stability.

[0083] The sleeve 3 is typically first welded to the insert plate 2 to form a pre-formed part, and then the insert plate 2 with the sleeve 3 is welded to the containment shell 1. In some embodiments, the insert plate 2 is perpendicular to the surface of the containment shell 1; in other embodiments, such as... Figure 2 As shown, the insertion plate 2 forms an angle γ with the surface of the containment shell 1.

[0084] The weld between the insertion plate 2 and the containment cylinder 1 is mostly a saddle-shaped curved weld with a double-sided bevel design. The saddle-shaped curved weld is a complex spatial curve with two parallel intersecting lines on the inside and outside, and the bevel depth is large. When the welding torch moves along this trajectory, the height of the welding torch changes constantly with the undulation of the curve, making it difficult to maintain arc stability.

[0085] Furthermore, the welding of the insert plate 2 to the containment shell 1 is limited by the on-site construction environment and must be carried out on-site during containment installation. Currently, the industry generally relies on manual argon arc welding to complete the operation. There are also structures that use automated equipment for automatic welding, but the stability and accuracy are poor, and the applicable scenarios are very limited.

[0086] To address this problem, this disclosure proposes a welding device for installing containment insert plates in nuclear power plants, referring to... Figures 3 to 8 As shown, it includes a track 11, a walking mechanism 10, and a welding assembly 12.

[0087] The track 11 is magnetically attached to the surface of the containment cylinder 1. The traveling mechanism 10 is mounted on the track 11. The traveling mechanism 10 is equipped with a welding assembly 12. The welding assembly 12 includes an automatic arc voltage adjustment mechanism 14, a welding torch support 17, and a wire guide 15. The welding torch support 17 is equipped with a welding torch A, and the wire guide 15 is used for wire feeding.

[0088] The track 11 is attached to the surface of the containment cylinder 1 by a magnetic attraction component. Specifically, a high-temperature resistant magnetic attraction component can be used, which can not only adapt to the high temperature preheating before welding, but also ensure convenient installation and disassembly and a firm attraction.

[0089] Track 11 includes, but is not limited to, the circular ring shown in the figure. Track 11 comprises multiple interconnected sub-track modules 118, such as... Figure 4 As shown, multiple sub-track modules 118 are quickly fixed together using insert rings 119. The sub-track modules can have the same or different shapes to provide different welding paths, for example, when... Figure 2 When the insert plate 2 and the containment cylinder 1 form an angle, the locally elliptical track is more suitable for welding saddle-shaped welds.

[0090] Of course, the track 11 can also be configured in other shapes. The traveling mechanism 10 is detachably mounted on the track 11, and the traveling mechanism 10, which carries the welding assembly 12 during welding, can be quickly mounted and dismounted from different sub-track modules. Therefore, the travel of the traveling mechanism 10 can be discontinuous.

[0091] In some embodiments, each sub-track module 118 is provided with adjustable support legs 111 at its bottom, as detailed below. Figure 4 and Figure 5 It is understood that the bottom of the adjustable outrigger is equipped with a magnet 112, which constitutes a magnetic attraction component to be attracted to the surface of the containment shell 1.

[0092] Adjustable outriggers 111 are used to adjust the distance of track 11 relative to the edge 20 of the insertion plate and / or the spacing of track 11 relative to the surface of the containment shell 1. Figure 4 and Figure 5 In the specific embodiment shown, the adjustable support leg 111 includes an extension convex plate 101, an axial rod 102, and a movable block 103. The extension convex plate 101 is L-shaped and detachably mounted on the bottom of the track 11. The axial rod 102 is mounted on the extension convex plate 101. The movable block 103 is movably connected to the axial rod 102, and a magnet 112 is mounted on the movable block 103. Preferably, the magnet 112 is connected to the movable block 103 using a universal joint, allowing each magnet 112 to independently conform to any curved surface.

[0093] The movement of the movable block 103 on the axial rod 102 can adjust the distance between the track 11 and the surface of the containment cylinder 1. At the same time, changing the shape of the sub-track module or adjusting the angle of the magnet 112 can adjust the distance between the track 11 and the edge 20 of the insertion plate.

[0094] This magnetic structure and flexible adjustable legs allow the rail 11 to be adapted to containment shells of any curvature and insertion plates of any installation orientation. It is a special tooling that can adapt to steel containment shell surfaces with certain curvature and height differences, and can meet the installation and fixing requirements of welding rails, ensuring the stability of the welding process.

[0095] Meanwhile, this flexible magnetic structure can ensure that the welding device body is parallel to the weld seam. Even if the insertion plate 2 is not perpendicular to the containment cylinder 1, the welding torch can still be kept parallel to the weld seam by adjusting the support legs.

[0096] Continue to refer to Figures 5 to 8 As shown, a support plate 150 is provided on the track 11, and the entire traveling mechanism 10 is located on the support plate 150. The traveling mechanism 10 includes a travel drive shaft 16 and a clutch mechanism 13. The travel drive shaft 16 engages with the track 11 so that the traveling mechanism can travel along the track.

[0097] The traveling mechanism 10 includes a housing 100, and the clutch mechanism 13, etc., are located inside the housing 100. Figure 8 and Figure 14 In the illustrated embodiment, the housing 100 has no bottom plate; it is mounted on the support plate 150 and houses components such as the clutch mechanism 13 and part of the travel drive shaft 16. Figure 5In another embodiment shown, the housing 100 has a square structure and is fixed to the support plate 150 via a quick-release structure 153. For example, the quick-release structure 153 includes a pin, a socket on the support plate 150, and a cross-shaped hole 107 on the housing 100. The pin is inserted into the socket and the cross-shaped hole 107, and then rotated 90° to act as a locking element, thus fixing the support plate 150 and the housing 100. Reverse rotation allows the support plate 150 and the housing 100 to separate. The quick-release structure 153 enables rapid assembly of both, effectively solving the problem of the welding device body and welding track assembly being too heavy and difficult to install during transportation and installation.

[0098] Continue to refer to Figures 8 to 11 As shown, the travel drive shaft 16 passes through the support plate 150 and includes a first conical tooth 161 at the top and a travel gear 162 at the bottom, the travel gear 162 meshing with the track 11. Specifically, the track can be equipped with... Figure 4 The external gear ring 117 shown meshes with the travel drive shaft 16. Of course, the gear ring that meshes with the travel gear 162 can also be an internal gear ring.

[0099] The clutch mechanism 13 includes a travel motor 130, which is configured to switch the travel drive shaft 16 between a rotating state and a stopped state. In the traveling state, the power output end of the travel motor 130 is connected to the travel drive shaft 16 to drive the travel drive shaft 16 to rotate around its own axis, thereby causing the travel drive shaft 16 to engage with the external gear ring 117 and drive the entire travel mechanism 10 to move around the track 11. In the stopped state, the power output end of the travel motor 130 is disengaged from the travel drive shaft 16, so that the travel drive shaft 16 stops rotating, and the travel mechanism 10 remains stationary on the track 11.

[0100] Specifically, such as Figure 8 As shown, the travel motor 130 of the clutch mechanism 13 meshes with the travel drive shaft through a bevel gear set. The travel motor is configured to switch the bevel gear set to be engaged or disengaged by its own moving position.

[0101] The travel motor 130 includes a second bevel tooth 134 located at the end of the output shaft 133. The second bevel tooth 134 and the first bevel tooth 161 form a bevel gear set. The axes of the second bevel tooth 134 and the first bevel tooth 161 are orthogonal to convert the axial rotation of the travel motor into the rotation of the travel drive shaft, thereby driving the travel gear 162 to move circumferentially on the outer gear ring 117.

[0102] The walking motor 130 is configured to engage or disengage the bevel gear set by moving its own position.

[0103] Specifically, such as in Figure 8 , Figure 10 , Figure 11In the embodiment shown, the walking motor 130 is mounted on a bracket, which includes an L-shaped mounting plate 31 and a flat plate 33. The flat plate 33 and the L-shaped mounting plate 31 form a U-shaped bracket, and the output shaft 133 of the motor passes through the L-shaped mounting plate 31.

[0104] The support is movably mounted on the support plate 150. Specifically, the support plate 150 provides... Figure 8 A raised block 155 with a groove is shown, the groove extending along the axis of the motor output shaft 133. A slider 19, movable on the groove, is provided at the bottom of the L-shaped mounting plate 31. The movement of the bracket drives the entire walking motor 130 to move.

[0105] A ball handle 32 is provided above the walking motor 130. The ball handle 32 is connected to the flat plate 33. By manually moving the ball handle 32, the entire support can be moved horizontally, which in turn drives the walking motor 130 to move left and right.

[0106] For example, the walking motor has a 130-degree direction. Figure 10 As shown, the gear set moves to the right and is in position. Figure 10 In the meshing state shown, the axial rotation of the output shaft 133 of the travel motor 130 is converted into the rotation of the travel drive shaft 16 via the gear set, thereby driving the bottom travel gear 162 to move circumferentially on the outer gear ring 117 of the track. The travel motor 130 moves circumferentially... Figure 10 As shown, the gear set is in the left position when the movement is to the left. Figure 11 When the separation state is shown, the walking mechanism stops operating.

[0107] Based on this embodiment, the plate 33 of the bracket is provided with a pin hole 34, which is close to the second conical tooth 134, such as... Figure 8 and Figure 14 As shown, the pin hole 34 is used to cooperate with the positioning element 35 to fix the position of the bracket.

[0108] In one specific embodiment, the positioning element 35 is a positioning pin. For example... Figure 8 and Figure 14 As shown, the housing 100 includes a through hole through which a positioning member 35 passes, the positioning member 35 being a positioning pin inserted into a pin hole 34 and a through hole on the housing 100.

[0109] It should be noted that, Figure 8 The housing 100 is omitted from the diagram to show its internal structure. The positioning element 35 is a stepped positioning pin with an end that mates with the pin hole 34.

[0110] When the positioning piece 35 is inserted into the pin hole 34, the bracket is fixed and the walking motor 130 will not move left or right, thereby fixing the position of the walking motor 130. This ensures stable meshing of the bevel gear and guarantees power transmission.

[0111] When the walking motor 130 and the travel drive shaft 16 are separated, the bevel gear set disengages, and the axial rotation of the walking motor cannot be transmitted to the travel drive shaft 16, thereby realizing the clutch control of the walking mechanism.

[0112] Back Figure 5 As shown, the support plate 150 is also provided with a plurality of guide pulleys 151, which can be simultaneously arranged on the inner and outer sides of the track 11. The track 11 also provides guide rails 116 that cooperate with the guide pulleys 151. In one embodiment, the track 11 may include a first guide rail 11a and a second guide rail 11b stacked together, the first guide rail 11a providing an external gear ring 117 that meshes with the traveling gear, and the second guide rail 11b providing the guide rail 116.

[0113] Walking mechanism 10 further refers to Figure 9 As shown, it also includes components such as a swing mechanism 192 and a junction box 194. The swing mechanism 192 is driven by a motor, which enables the welding assembly 12 located on the traveling mechanism 10 to perform the reciprocating swing required for welding. The main body of the swing mechanism 192 is located inside the housing 100.

[0114] The welding assembly 12 located on the walking mechanism 10 is further referenced. Figure 4 and Figure 14 As shown, the welding torch support 17 and the wire guide 15 are both connected to the automatic arc voltage adjustment mechanism 14, which is connected to the swing mechanism 192.

[0115] Arc voltage refers to the voltage drop between the two ends of a welding arc. The automatic arc voltage adjustment mechanism adjusts the arc voltage by changing the arc length. The automatic arc voltage adjustment mechanism 14 includes a controller and a lifting component 141. The controller monitors the arc voltage value during the welding process in real time, compares it with a preset target arc voltage value to obtain a deviation signal, and controls the lifting component 141 to adjust the distance between the welding torch on the welding torch holder and the weld surface during the welding process.

[0116] Lifting component 141 includes Figure 7 , Figure 12 The longitudinally extending lead screw 142 and the connecting block 143 threadedly connected to the lead screw 142 are shown. The connecting block 143 is also connected to the welding torch support 17 and the wire guide frame 15.

[0117] The lifting component 141 mainly controls the welding torch's approach to and movement away from the weld by controlling the up and down movement of the lead screw 142 and the connecting block 143. Specifically, as... Figure 12As shown, the arc-driven motor 144 drives the first synchronous pulley 145 and the synchronous belt 146 at the top to rotate. The synchronous belt 146 drives the second synchronous pulley 147 to rotate. The second synchronous pulley 147 and the lead screw 142 share the same axis of rotation. As a result, the lead screw 142 rotates, causing the connecting block 143 to move up and down. This can avoid poor weld formation consistency caused by unsuitable welding torch height, such as piercing into the molten pool due to a low tungsten electrode height, or porosity, undercut, and other welding defects caused by an excessively high tungsten electrode height.

[0118] This device is suitable for non-consumable electrode argon arc welding. During welding, the welding wire B filling the weld seam needs to enter from the welding torch A side.

[0119] Figure 13 The structure of the wire guide frame 15 carrying the welding wire B is further shown. The wire guide frame 15 includes a height adjustment mechanism 156, an angle adjustment mechanism 152, a wire guide frame connector 154, a wire feeding tube 159, and a screw 158. The wire feeding tube 159 accommodates the welding wire B. The wire guide frame connector 154 is connected to the connecting block 143 of the lifting component 141. The height adjustment mechanism mainly controls the height and angle of the wire guide frame, realizing the adjustment of the overall posture of the wire guide frame 15. This solves the problem that the welding wire may be bent after being wound on the wire spool for a long time and delivered to the welding gun during the wire feeding process, effectively improving the welding quality.

[0120] In some embodiments, the welding device is further provided with a molten pool monitoring camera at the end, which can monitor the weld formation quality in real time and guide the adjustment of wire feeding direction and wire feeding amount in a timely manner.

[0121] A control center connected to the welding device can also be set up, containing a database of welding processes to guide welding operators in selecting process parameters. Addressing the characteristic of saddle-shaped welds where the height and lateral position change synchronously during the welding torch's movement, the spatial geometric parameters of the intersection line are pre-stored. Simultaneously, as the welding carriage moves, the control system synchronously drives the arc voltage motor and the oscillating motor according to a position function, enabling the welding torch to actively follow the intersection line trajectory.

[0122] The above-mentioned device has the following advantages: (1) By setting up magnetic attraction and adjustable support legs, the track can be flexibly and stably fixed on the surface of the containment shell, forming a stable reference support, and is applicable to insert plates of different sizes and containment shell surfaces of different curvatures; (2) By using the walking clutch mechanism, the device can realize the functions of quick positioning and quick return during construction, reducing the time spent on adjustment.

[0123] The following describes how to use the insertion plate mounting welding device.

[0124] First, determine the welding path based on the weld location and the curvature of the containment vessel surface. Adjust the adjustable legs below the track to ensure that the end face of the magnetic magnet below the welding track is in close contact with the steel containment vessel surface. After installation, ensure the installation is secure and stable, and implement fall prevention measures.

[0125] Subsequently, the walking mechanism 10 is connected to the welding assembly 12, and the walking mechanism 10 is installed on the track 11; the walking mechanism 10 is then in a walking state on the track 11. The welding torch is positioned at the center of the weld seam. After adjustment, a path simulation is performed to ensure that no interference occurs between the various mechanisms and other objects during the welding process. The welding torch is then started to begin welding, and the welding assembly 12 moves along the track while the welding torch continues welding.

[0126] The position and height of the track are adjusted in real time during the welding process to construct a suitable welding path, allowing the track to be adjusted in real time by each submodule during welding. The movement and stopping of the walking mechanism are achieved through a clutch mechanism.

[0127] When it is necessary to remove the walking mechanism 10, turn off the walking motor 130, separate the walking motor 130 and the travel drive shaft 16, release the quick release structure 153, separate the housing 100 and the support plate 150, and at the same time disengage the guide pulley 151 and the walking gear 162 from the track 11.

[0128] In addition, specified welding process parameters can be recorded in real time, or relevant welding guidance process parameters can be retrieved from the welding process library in the system. After the settings are completed, the equipment performs a self-check, such as checking the functions of each moving mechanism and gas detection. After all functions are normal, it enters the waiting state for welding. After the operator confirms that all parameters are correct, the operator starts the welding start button. The welding device welds according to the welding process parameters. During the welding process, the operator needs to adjust the wire feed amount, wire feed angle, etc. in real time according to the visual monitoring content of the molten pool to ensure the welding quality.

[0129] First, weld the weld seams on the outside of the containment shell. After welding on one side, remove the insert plate, install the welding device, and re-fix it to the inside of the containment shell. Continue welding the weld seams on the inside of the containment shell until the installation weld seams of the electrical penetrations are completed.

[0130] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0131] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0132] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A welding device for installing insert plates on containment vessels of a nuclear power plant, used for welding insert plates onto the containment vessel, characterized in that, include: The track is magnetically attached to the surface of the containment shell. A traveling mechanism, mounted on the track, includes a traveling drive shaft and a clutch mechanism. The traveling drive shaft engages with the track to enable the traveling mechanism to travel along the track. The clutch mechanism includes a traveling motor, which is configured to switch the traveling drive shaft to a rotating state or a stopped state. as well as A welding assembly includes an automatic arc voltage adjustment mechanism, a welding torch support, and a wire guide. The welding torch support and the wire guide are jointly mounted on the automatic arc voltage adjustment mechanism, which is connected to the traveling mechanism. The track includes multiple sub-track modules connected to each other. The sub-track modules may have the same or different shapes. The bottom of each sub-track module is provided with adjustable support legs. The adjustable support legs are used to adjust the distance of the track relative to the edge of the insertion plate and / or the spacing of the track relative to the surface of the containment shell. The adjustable support leg includes an extension convex plate, an axial rod, and a movable block. A magnet is provided at the bottom of the adjustable support leg, and the magnet constitutes the magnetic attraction assembly. The extension convex plate is detachably disposed at the bottom of the track. The axial rod is disposed on the extension convex plate. The movable block is movably connected to the axial rod, and the magnet is disposed on the movable block.

2. The nuclear power plant containment vessel insert plate installation welding device as described in claim 1, characterized in that, The clutch mechanism also includes a bevel gear set, and the travel motor meshes with the travel drive shaft through the bevel gear set; The walking motor is movably configured to move the bevel gear set into an engaged or disengaged state by means of its own positional movement.

3. The nuclear power plant containment vessel insert plate installation welding device as described in claim 2, characterized in that, The travel drive shaft includes a travel gear located at the bottom, the track is provided with a gear ring that meshes with the travel gear, a first conical tooth is provided at the top of the travel drive shaft, and the travel motor includes a second conical tooth located at the end of the output shaft. The second conical tooth and the first conical tooth form the bevel gear set.

4. The nuclear power plant containment vessel insert plate installation welding device as described in claim 3, characterized in that, The device also includes a support plate disposed on the track, the traveling mechanism is disposed on the support plate, and the traveling drive shaft passes through the support plate.

5. The nuclear power plant containment vessel insert plate installation welding device as described in claim 4, characterized in that, The clutch mechanism also includes a positioning element and a bracket. The bracket is used to support the walking motor and is movably mounted on the support plate. The positioning element is used to fix the position of the bracket.

6. The nuclear power plant containment vessel insert plate installation welding device as described in claim 5, characterized in that, The walking mechanism includes a housing, the walking motor, the positioning element and the bracket are located inside the housing, the bracket includes a pin hole, the housing includes a through hole, and the positioning element is a positioning pin inserted into the pin hole and the through hole.

7. The nuclear power plant containment vessel insert plate installation welding device as described in claim 4, characterized in that, The track includes a first guide rail and a second guide rail stacked together, wherein the first guide rail provides an external gear ring that meshes with the traveling gear. The support plate is also provided with a plurality of guide pulleys, and the second guide rail provides a guide rail that cooperates with the guide pulleys.

8. The nuclear power plant containment vessel insert plate installation welding device as described in claim 6, characterized in that, The support plate and the housing are connected by a quick-release structure.

9. The nuclear power plant containment vessel insert plate installation welding device as described in claim 1, characterized in that, The automatic arc voltage adjustment mechanism includes a controller and a lifting component. The lifting component is connected to the welding torch support and the wire guide. The controller is used to monitor the arc voltage value during the welding process in real time, compare it with the preset target arc voltage value to obtain a deviation signal, and control the lifting component to adjust the distance between the welding torch on the welding torch support and the weld surface according to the deviation signal.

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