CN217799808U - Pipe blocking device for welding - Google Patents

Abstract

The utility model relates to a nuclear power technical field particularly, relates to a stifled pipe device of welding. The welding pipe plugging device comprises a sliding table, a first support, a moving assembly, a driving mechanism, a welding device and a plug installation device; the first support is arranged at the bottom of a manhole at the main steam outlet end of the steam generator, the sliding table is overlapped on a supporting surface of the first support, a guide rail is arranged on the sliding table, the moving assembly is in sliding fit with the guide rail, and both the welding device and the plug installation device can be installed on the moving assembly; the driving mechanism is in transmission connection with the moving assembly and is used for driving the moving assembly to slide along the guide rail. The welding pipe plugging device provided by the utility model greatly reduces the construction difficulty, shortens the exposure time of constructors in the radiation environment, and is beneficial to the health of the constructors; in addition, the requirement on the field environment is low, and the adaptability is strong.

Description

Pipe blocking device for welding

Technical Field

The utility model relates to a nuclear power technical field particularly, relates to a stifled pipe device of welding.

Background

The steam generator is one of key equipment in a high temperature gas cooled reactor (HTR-PM) nuclear power plant, a heat transfer pipe of the steam generator can be mechanically or chemically damaged under the action of high temperature, high pressure and high radiation for a long time, so that the heat transfer pipe is easily damaged to cause radioactive coolant leakage accidents, and serious social and environmental problems and huge economic losses are caused.

The main steam outlet end of the steam generator of the high-temperature gas cooled reactor nuclear power station is generally provided with a long and narrow manhole, and for realizing the transmission of a remote welding system and ensuring the welding precision, mode fixed support rods such as foundation bolts are generally additionally arranged on two sides of the manhole to transmit a welding unit, but when the high-temperature gas cooled reactor nuclear power station steam generator is in actual operation, the fixed support rods are arranged in advance to have the following two problems: 1) The construction difficulty is increased by fixing the support rods in advance, the exposure time of constructors in a radiation environment is increased, and the body health of the constructors is influenced; 2) The support rod is often not available or allowed to be fixed by means of anchor bolts or the like in the field environment. Therefore, it is extremely difficult to transport the welding device through a long and narrow manhole to the pipe plug welding position.

In summary, how to overcome the above-mentioned defects of the existing welding pipe plugging manner is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stifled pipe device of welding to alleviate the high technical problem of the construction degree of difficulty that the stifled pipe mode of welding among the prior art exists.

The utility model provides a stifled pipe device of welding, including slip table, first support, removal subassembly, actuating mechanism, welding set and end cap installation device.

The manhole bottom of steam generator's main steam outlet end is arranged in to first support, the slip table overlap joint is in on the holding surface of first support, be equipped with the guide rail on the slip table, remove the subassembly with guide rail sliding fit, welding set with end cap installation device homoenergetic install in remove the subassembly.

The driving mechanism is in transmission connection with the moving assembly and is used for driving the moving assembly to slide along the guide rail.

Preferably, as an implementable manner, the moving assembly comprises a fixed disc, the fixed disc is in sliding fit with the guide rail, a plurality of telescopic clamping jaws are mounted on the fixed disc, the telescopic directions of the telescopic clamping jaws are perpendicular to the guide direction of the guide rail, and the telescopic clamping jaws are used for being in clamping fit with a plurality of parts, which are arranged on the inner wall surface of the main steam outlet end of the steam generator at intervals in the circumferential direction.

Preferably, as an embodiment, the telescopic end of the telescopic jaw is mounted with an elastic floating head for abutting against an inner wall surface of the main steam outlet end.

Preferably, as an implementable mode, the outer end of the sliding table is fixedly connected with a second support, and the second support is used for being arranged on a foundation.

Preferably, as an implementation mode, a supporting cylinder is installed on the first support, an expansion link of the supporting cylinder is vertically arranged, a horizontally arranged roller is rotatably connected to the top of the expansion link of the supporting cylinder, the axial direction of the roller is perpendicular to the guide rail, and the supporting cylinder can drive the roller to rise to a height higher than a supporting surface of the first support or fall to a height lower than the supporting surface of the first support;

and/or a walking wheel is installed at the bottom of the inner end of the sliding table and can roll along the inner wall surface of the main steam outlet end of the steam generator.

Preferably, as an implementation manner, the driving mechanism includes a first motor, a lead screw and a nut, the first motor is installed on the sliding table, the lead screw is in running fit with the sliding table, the nut is in fit with the lead screw, and the nut is fixed on the moving assembly.

Preferably, as an implementation manner, a quick-change connector is arranged on the moving assembly, and both the welding device and the plug installation device can be detachably connected with the quick-change connector.

Preferably, as an implementation mode, the plug mounting device includes a mounting seat and a second motor, the mounting seat is capable of being mounted on the moving assembly, the second motor is mounted on the mounting seat, and a cross section of an output shaft of the second motor is consistent with a polygonal cross section of a mounting hole on the plug;

and/or the welding device comprises a welding seat, a third motor and a laser head, wherein the welding seat can be installed on the moving assembly, the third motor is installed on the welding seat, and an output shaft of the third motor is connected with the laser head and used for driving the laser head to rotate around the plug;

and/or an image acquisition device is further installed on the moving assembly.

Preferably, as an implementable mode, the moving assembly further comprises a numerical control turntable and a three-axis assembly, the numerical control turntable is mounted on the fixed disc, the three-axis assembly is mounted on the numerical control turntable, an axis of the numerical control turntable is parallel to the guide rail, and both the welding device and the plug mounting device can be mounted at the tail end of the three-axis assembly.

Preferably, as an implementation mode, the welding pipe plugging device further comprises an operation table, and the operation table is used for placing the welding device, the plug installation device and the plug storage box.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model provides a welding pipe blocking device utilizes the manhole of steam generator's main steam outlet end as the support, places first support at the manhole bottom, utilizes first support as the bearing structure of slip table to, thus, the setting up of first support has just replaced and has originally realized fixed bracing piece at manhole both sides with rag bolt, has greatly reduced the construction degree of difficulty, has shortened the exposure time of constructor in the radiation environment, is favorable to constructor's healthy; in addition, because the manhole is put into to first support, do not relate to rag bolt's fixed completely, so require less to the site environment, strong adaptability.

On the basis, the sliding table can smoothly realize reliable positioning and guiding of the moving assembly under the bearing of the first support, so that the driving mechanism can drive the moving assembly to smoothly move to the position near the pipe plugging welding position along the guide rail on the sliding table, namely, the pipe plugging welding device can smoothly convey the plug mounting device and the welding device mounted on the moving assembly to the pipe plugging welding position through a long and narrow manhole; after the movable assembly reaches the pipe plugging welding position, the plug installation device installed on the movable assembly can install the plug to the damaged position of the heat transfer pipe, and the welding device installed on the movable assembly welds the periphery of the plug, so that pipe plugging operation is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of a welding pipe plugging device and a steam generator according to an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of a moving assembly, a welding device and a camera in the welding pipe plugging device according to the embodiment of the present invention;

fig. 3 is a schematic view of an assembly structure of a fixed disk and a telescopic claw in the welding pipe plugging device according to the embodiment of the present invention;

fig. 4 is a schematic perspective view of a first support in the welding pipe plugging device provided in the embodiment of the present invention;

fig. 5 is a schematic view of a partial structure of a welding pipe plugging device according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a plug mounting device with a plug in a welding plug pipe device according to an embodiment of the present invention;

fig. 7 is a schematic cross-sectional structural diagram of a welding device in a welding pipe plugging device according to an embodiment of the present invention;

fig. 8 is a three-dimensional structure diagram of an operation panel provided with an end cap storage box, a welding device and an end cap installation device in the welding pipe plugging device provided by the embodiment of the utility model.

Description of the reference numerals:

100-a sliding table; 110-a guide rail; 120-a second support; 130-road wheels;

200-a first support; 210-a support cylinder; 220-a roller;

300-a moving assembly; 310-a fixed disk; 311-a slider; 320-telescopic jaws; 321-a resilient floating head; 330-a numerical control turntable; 340-a triaxial assembly; 341-quick change coupler;

410-a first motor; 420-a nut;

500-a welding device; 510-a soldering nest; 520-a third motor;

600-plug mounting means; 610-a mounting seat; 620-a second motor;

700-a camera;

800-manhole;

900-an operation desk;

1000-plug storage box; 1010-plug;

1100-gantry crane.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.

Referring to fig. 1, 2, 5, and 8, the present embodiment provides a welding pipe plugging device, which includes a sliding table 100, a first support 200, a moving assembly 300, a driving mechanism, a welding device 500, and a plug mounting device 600; the first support 200 is arranged at the bottom of a manhole 800 at the main steam outlet end of the steam generator, the sliding table 100 is lapped on the supporting surface of the first support 200, the sliding table 100 is provided with a guide rail 110, the moving assembly 300 is in sliding fit with the guide rail 110, and both the welding device 500 and the plug installation device 600 can be installed on the moving assembly 300; the driving mechanism is in transmission connection with the moving assembly 300 and is used for driving the moving assembly 300 to slide along the guide rail 110.

According to the welding pipe blocking device provided by the embodiment, the manhole 800 at the main steam outlet end of the steam generator is used as a support, the first support 200 is placed at the bottom of the manhole 800, and the first support 200 is used as a bearing structure of the sliding table 100, so that the arrangement of the first support 200 replaces the original support rods for fixing by using foundation bolts at two sides of the manhole 800, the construction difficulty is greatly reduced, the exposure time of constructors in a radiation environment is shortened, and the physical health of the constructors is facilitated; in addition, because the manhole 800 is put into to the first support 200, do not involve the fixed of rag bolt at all, so it is lower to the on-the-spot environmental requirement, strong adaptability.

On this basis, the sliding table 100 can smoothly realize reliable positioning and guiding of the moving assembly 300 under the support of the first support 200, so that the driving mechanism can drive the moving assembly 300 to smoothly move to the vicinity of the pipe plugging welding position along the guide rail 110 on the sliding table 100, that is, the welding pipe plugging device provided by this embodiment can smoothly transport the plug mounting device 600 and the welding device 500 mounted on the moving assembly 300 to the pipe plugging welding position through the long and narrow manhole 800; after the movable block 300 reaches the plug welding position, the plug installation device 600 installed on the movable block 300 can install the plug 1010 at the damaged portion of the heat transfer pipe, and the welding device 500 installed on the movable block 300 welds the periphery of the plug 1010 to perform the plug operation.

Referring to fig. 2 and 3, in the specific structure of the moving assembly 300, a fixed plate 310 may be disposed, the fixed plate 310 is slidably engaged with the guide rail 110, a plurality of telescopic claws 320 are mounted on the fixed plate 310, and the telescopic direction of the telescopic claws 320 is perpendicular to the guide direction of the guide rail 110, so that the telescopic claws 320 can be extended and retracted along the radial direction of the main steam outlet of the steam generator, and thus, the plurality of telescopic claws 320 can be tightly engaged with a plurality of portions of the inner wall surface of the main steam outlet of the steam generator, which are circumferentially spaced, to position the fixed plate 310, thereby improving the stability of the welding device 500 and the plug mounting device 600 mounted on the fixed plate 310, and improving the mounting accuracy and the welding operation accuracy of the plug 1010.

Preferably, an elastic floating head 321 can be installed at the telescopic end of the telescopic claw 320, the elastic floating head 321 is abutted against the inner wall surface of the main steam outlet end, and due to the fact that a force sensor is arranged on the elastic floating head 321, an external controller can control the extension length of the telescopic claw 320 on the basis of a force signal, the constant acting force of auxiliary positioning is ensured, and excessive influence on a conveying unit composed of the sliding table 100, a driving mechanism and the like is prevented; meanwhile, the damage to the main steam outlet end can be prevented.

The telescopic jaw 320 may be a cylinder.

Specifically, referring to fig. 3 and 5, the slider 311 is provided on the fixed disk 310, and the slider 311 is slidably engaged with the guide rail 110.

Referring to fig. 1, a second support 120 may be additionally provided, and the second support 120 is connected to an outer end of the sliding platform 100 (i.e., an end located outside the manhole 800), and when the sliding platform 100 is installed in place, the second support 120 may be dropped on the ground, and the second support 120 is used as a support structure for the outer end of the sliding platform 100, so that the stability of the sliding platform 100 may be further improved.

In addition, referring to fig. 1 and 4, a support cylinder 210 may be installed on the first support 200 placed in the manhole 800, an expansion rod of the support cylinder 210 is vertically disposed, a horizontally disposed roller 220 is rotatably connected to the top of the expansion rod of the support cylinder 210, and the roller 220 is vertically disposed in the axial direction of the guide rail 110, so that the rolling direction of the top of the roller 220 may be consistent with the guide of the guide rail 110. Before the sliding table 100 passes through the manhole 800, the supporting cylinder 210 can be started in advance, the supporting cylinder 210 is utilized to drive the roller 220 to rise to a height higher than the supporting surface of the first support 200, namely, the top of the roller 220 is higher than the supporting surface of the first support 200, then the sliding table 100 is pushed into the manhole 800, the sliding table 100 can be in contact with the roller 220, the sliding table 100 is continuously pushed to pass through the manhole 800, and in the process, the existence of the roller 800 can greatly reduce the manpower consumed for pushing the sliding table 100 and can reduce the abrasion; when the sliding table 100 is in place, the supporting cylinder 210 can be started, the supporting cylinder 210 is utilized to drive the roller 220 to fall to a height lower than the supporting surface of the first support 200, that is, the roller 220 is wholly positioned below the supporting surface of the first support 200, at this time, the roller 220 is not in contact with the sliding table 100 any more, and the sliding table 100 can fall onto the supporting surface of the first support 200, so that the sliding table 100 is not prone to deviation, and the stability of the sliding table 100 in conveying the moving assembly 300, installing the plugs 1010 and welding can be ensured.

Referring to fig. 1 and 5, a walking wheel 130 may be installed at the bottom of the inner end (i.e., the end located inside the manhole 800) of the sliding table 100, so that when the inner end of the sliding table 100 is pushed into the main steam outlet of the steam generator, the walking wheel 130 may roll along the inner wall surface of the main steam outlet, and the walking wheel 130 may not only realize the support of the sliding table 100, but also reduce the friction between the sliding table 100 and the inner wall surface of the main steam outlet, thereby saving the manpower consumed in pushing the sliding table 100 and reducing the wear.

In the specific structure of the driving mechanism, a first motor 410, a lead screw and a nut 420 may be provided, the first motor 410 is mounted on the slide table 100, the lead screw is rotatably engaged with the slide table 100, the nut 420 is engaged with the lead screw, and the nut 420 is fixed to the moving assembly 300, so that the moving assembly 300 can be driven to move along the guide rail 110 by activating the first motor 410.

Preferably, both ends of the screw are rotatably matched with the sliding table 100 through bearings, so that both ends of the screw can be supported by the bearings, friction force generated between the screw and the sliding table 100 when the screw rotates can be reduced, efficiency of the first motor 410 is improved, and abrasion is reduced.

The first motor 410 and the lead screw may be coupled via a coupling.

Preferably, referring to fig. 1 and 2, a quick-change connector 341 may be disposed on the moving assembly 300, and the welding device 500 and the plug installation device 600 are detachably connected to the quick-change connector 341, that is, the welding device 500 and the plug installation device 600 are connected to the moving assembly 300 through the quick-change connector 341, and the quick-change connector 341 is disposed to improve the assembling and disassembling efficiency of the welding device 500 and the plug installation device 600, so that the plugging efficiency can be improved.

Referring to fig. 6 and 8, in a specific structure of the plug mounting device 600, a mounting seat 610 and a second motor 620 (a low-speed motor) may be provided, the mounting seat 610 is mounted on the moving assembly 300, the second motor 620 is mounted on the mounting seat 610, and a cross section of an output shaft of the second motor 620 is set to be identical to a polygonal (e.g., hexagonal) cross section of a mounting hole of the plug 1010, so that the mounting hole of the plug 1010 is aligned with the output shaft of the second motor 620, and the plug 1010 is sleeved on the output shaft of the second motor 620, so that the connection between the plug 1010 and the second motor 620 can be realized, which is very convenient, and when the second motor 620 is started, the output shaft of the second motor 620 can drive the plug 1010 to rotate, so that the plug 1010 can be smoothly mounted at a pipe plugging position.

Referring to fig. 7 and 8, in a specific structure of the welding device 500, a welding seat 510, a third motor 520 and a laser head may be disposed, the welding seat 510 is mounted on the moving assembly 300, the third motor 520 is mounted on the welding seat 510, and an output shaft of the third motor 520 is connected to the laser head, so that the third motor 520 is used to drive the laser head to rotate around the plug 1010, thereby achieving welding of the laser head to the plug 1010, and the welding device is simple in structure and is not prone to interference.

Referring to fig. 1 and 2, an image acquisition device (e.g., a camera 700) may be further installed on the moving assembly 300, so that the image acquisition device acquires an image and combines with an image processing method to determine the position of the plug 1010, thereby realizing the plug installation and the image acquisition of a welding site, and enabling the plug 1010 to be smoothly installed at a correct position and accurately welded.

Referring to fig. 1, 2 and 5, in a specific structure of the moving assembly 300, a numerical control rotary table 330 and a three-axis assembly 340 may be disposed, the numerical control rotary table 330 is mounted on the fixed tray 310, the three-axis assembly 340 is mounted on the numerical control rotary table 330, and an axial direction of the numerical control rotary table 330 is disposed parallel to the guide rail 110, both the welding device 500 and the plug mounting device 600 may be mounted at a terminal end of the three-axis assembly 340, the three-axis assembly 340 may drive the welding device 500 and the plug mounting device 600 to move along three directions X/Y/Z, and the numerical control rotary table 330 may drive the three-axis assembly 340 to rotate, thereby implementing the pipe plugging welding near the wall surface.

Referring to fig. 1 and 8, a console 900 may be added to place the welding device 500, the plug installation device 600, and the plug storage case 1000 using the console 900 for easy replacement and installation.

The irradiation resistance of the numerical control turntable 330, the three-axis assembly 340, the welding device 500 and the like is not lower than 10Gy/h.

During actual operation, the first support 200 is placed into the manhole 800 in advance, the supporting cylinder 210 is used for driving the roller 220 to ascend to the position above the supporting surface of the first support 200, then the gantry hanger 1100 is used for hoisting the outer end of the sliding table 100, the sliding table 100 penetrates through the manhole 800, the inner end of the sliding table 100 extends to the position near the pipe plugging welding position, the gantry hanger 1100 is removed, and then the supporting cylinder 210 is used for driving the roller 220 to descend to the position below the supporting surface of the first support 200; and starting the telescopic clamping jaws 320, enabling the elastic floating heads 321 at the tail ends of the telescopic clamping jaws 320 to be abutted against the inner wall surface of the main steam outlet end of the steam generator, and clamping the fixed disc 310 to finish the installation of the sliding table 100.

After the sliding table 100 is installed, the plug installation device 600 is installed on the quick-change connector 341 at the tail end of the triaxial assembly 340, the plug 1010 is installed on the plug installation device 600, the first motor 410 is started to drive the lead screw to rotate, the triaxial assembly 340 is driven by the nut 420 to slide to the main steam outlet end of the steam generator along the guide rail 110, the pipe plugging welding position is found by the camera 700, the plug installation device 600 is driven to the pipe plugging welding position by the triaxial assembly 340, and the plug 1010 is installed at the pipe plugging welding position of the heat transfer pipe by the plug installation device 600; then, the first motor 410 is started to drive the lead screw to rotate, the nut 420 is used for driving the whole moving assembly 300 to retreat to the outer side of the manhole 800 along the guide rail 110, the plug installation device 600 is disassembled, the welding device 500 is installed on the quick-change connector 341 at the tail end of the three-shaft assembly 340, the first motor 410 is started to drive the lead screw to rotate again, the nut 420 is used for driving the three-shaft assembly 340 to slide to the main steam outlet end of the steam generator along the guide rail 110, the plug 1010 which is just screwed into the welding position of the plug pipe is found through the camera 700, and the welding device 500 is used for carrying out laser welding along the circumference of the plug 1010; and finally, withdrawing the triaxial assembly 340 to the outer side of the manhole 800 to complete the installation of one plug 1010 in the welding operation, and sequentially installing and welding the plugs 1010 in all the pipe plugging welding positions according to the steps until the pipe plugging welding operation of all the pipe plugging welding positions is completed.

After the pipe blockage welding operation is completed, the telescopic clamping claw 320 is started, the elastic floating head 321 at the tail end of the telescopic clamping claw 320 is separated from the inner wall surface of the main steam outlet end of the steam generator, the supporting cylinder 210 is utilized to drive the roller 220 to ascend to the position above the supporting surface of the first support 200, then the sliding table 100 is pulled out from the manhole 800, then the supporting cylinder 210 is utilized to drive the roller 220 to descend to the position below the supporting surface of the first support 200, the sliding table 100 can be disassembled, and finally the first support 200 can be taken out from the manhole 800.

To sum up, the embodiment of the utility model discloses welding stifled pipe device, it has overcome a great deal of technical defect of traditional welding stifled pipe mode. The welding pipe plugging device provided by the embodiment of the utility model greatly reduces the construction difficulty, shortens the exposure time of constructors in the radiation environment, and is beneficial to the health of the constructors; in addition, the requirement on the field environment is low, and the adaptability is strong.

In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A welding pipe blocking device is characterized by comprising a sliding table (100), a first support (200), a moving assembly (300), a driving mechanism, a welding device (500) and a plug installation device (600);

the first support (200) is arranged at the bottom of a manhole (800) at the main steam outlet end of the steam generator, the sliding table (100) is lapped on a supporting surface of the first support (200), a guide rail (110) is arranged on the sliding table (100), the moving assembly (300) is in sliding fit with the guide rail (110), and both the welding device (500) and the plug installation device (600) can be installed on the moving assembly (300);

the driving mechanism is in transmission connection with the moving assembly (300) and is used for driving the moving assembly (300) to slide along the guide rail (110).

2. The welding pipe blocking device according to claim 1, wherein the moving assembly (300) comprises a fixed disc (310), the fixed disc (310) is in sliding fit with the guide rail (110), a plurality of telescopic clamping jaws (320) are mounted on the fixed disc (310), the telescopic directions of the telescopic clamping jaws (320) are perpendicular to the guide direction of the guide rail (110), and the plurality of telescopic clamping jaws (320) are used for being in clamping fit with a plurality of positions of the inner wall surface of the main steam outlet end of the steam generator, which are circumferentially arranged at intervals.

3. The welding pipe plugging device according to claim 2, wherein an elastic floating head (321) is mounted at the telescopic end of said telescopic jaw (320), said elastic floating head (321) is used for abutting against the inner wall surface of the main steam outlet end.

4. The welding pipe plugging device according to claim 1, wherein a second support (120) is fixedly connected to an outer end of the sliding table (100), and the second support (120) is arranged on a foundation.

5. The welding pipe blocking device according to claim 1, wherein a supporting cylinder (210) is installed on the first support (200), an expansion rod of the supporting cylinder (210) is vertically arranged, a horizontally arranged roller (220) is rotatably connected to the top of the expansion rod of the supporting cylinder (210), the axial direction of the roller (220) is perpendicular to the guide rail (110), and the supporting cylinder (210) can drive the roller (220) to rise to a height higher than the supporting surface of the first support (200) or fall to a height lower than the supporting surface of the first support (200);

and/or a walking wheel (130) is installed at the bottom of the inner end of the sliding table (100), and the walking wheel (130) can roll along the inner wall surface of the main steam outlet end of the steam generator.

6. The welding pipe plugging device according to claim 1, wherein said driving mechanism comprises a first motor (410), a lead screw and a nut (420), said first motor (410) is installed on said sliding table (100), said lead screw is in running fit with said sliding table (100), said nut (420) is in running fit with said lead screw, and said nut (420) is fixed on said moving assembly (300).

7. The welding plugging device according to claim 1, wherein a quick-change connector (341) is arranged on said moving assembly (300), and said welding device (500) and said plug mounting device (600) are detachably connected to said quick-change connector (341).

8. The welded pipe plugging device of claim 1, wherein said plug mounting device (600) comprises a mounting seat (610) and a second motor (620), said mounting seat (610) being mountable to said moving assembly (300), said second motor (620) being mounted to said mounting seat (610), a cross-section of an output shaft of said second motor (620) corresponding to a polygonal cross-section of a mounting hole of a plug (1010);

and/or the welding device (500) comprises a welding seat (510), a third motor (520) and a laser head, wherein the welding seat (510) can be installed on the moving assembly (300), the third motor (520) is installed on the welding seat (510), and an output shaft of the third motor (520) is connected with the laser head and is used for driving the laser head to rotate around the plug (1010);

and/or an image acquisition device is also installed on the moving assembly (300).

9. The welding and pipe plugging device of claim 2, wherein said moving assembly (300) further comprises a numerically controlled turntable (330) and a three-axis assembly (340), said numerically controlled turntable (330) is mounted to said stationary platen (310), said three-axis assembly (340) is mounted to said numerically controlled turntable (330), an axis of said numerically controlled turntable (330) is parallel to said guide rail (110), and said welding device (500) and said plug mounting device (600) are both mountable to an end of said three-axis assembly (340).

10. The welding plugging device according to any one of claims 1 to 9, further comprising an operation table (900), wherein said operation table (900) is used for placing said welding device (500), said plug mounting device (600) and said plug storage box (1000).

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