Online processing and repairing device for flange sealing surface of nuclear reactor pressure vessel

Abstract

The invention relates to the technical field of nuclear power overhaul, in particular to an online machining and repairing device for a nuclear reactor pressure vessel flange sealing surface. The device comprises a base mechanism, a main shaft rotating mechanism, a cutting arm beam and a dust collection mechanism, the base mechanism and the pressure vessel cylinder are coaxially arranged, and the base mechanism is supported on the inner wall of the pressure vessel cylinder; a hole structure is arranged in the center of the base mechanism; the main shaft rotating mechanism is adaptively connected with the hole structure of the base mechanism; the cutting arm beam is horizontally arranged and fixedly connected to the upper end face of the spindle rotating mechanism through a pressing plate, the spindle rotating mechanism drives the cutting arm beam to rotate, and a tool at the head of the cutting arm beam is driven to conduct online machining repair on the nuclear reactor pressure vessel flange sealing face. The shielding mechanism is located on the lower portion of the base mechanism, installed on the hanging basket supporting face in the pressure container and attached to the inner wall of a cylinder of the pressure container. The dust collection mechanism is connected to the side wall of the cutting arm beam, and the dust collection mechanism and the cutting arm beam rotate synchronously. According to the invention, the problem that online intelligent repair cannot be carried out on the flange sealing surface in the maintenance process of the reactor pressure vessel of the pressurized water reactor nuclear power station at present is solved, and the aim of ensuring the sealing performance and integrity of the pressure-bearing boundary of the primary loop through a reliable maintenance means is fulfilled.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power maintenance, and in particular to an online processing and repairing device for a flange sealing surface of a nuclear reactor pressure vessel. Background Art

[0002] The reactor pressure vessel is one of the most critical equipment in a nuclear power plant. The top cover of the pressure vessel is connected to the cylinder in the form of main bolts-metal sealing ring-flange. The flange sealing surface is the pressure-bearing boundary of the primary circuit of the nuclear reactor pressure vessel. Its surface state is directly related to the sealing and operation safety of the nuclear reactor. During the operation of the nuclear reactor, the pressure vessel is in an environment of high temperature, high pressure, high radioactivity and corrosive media. Due to factors such as medium corrosion, load and human accidents, defects that affect the sealing or local strength will appear on the flange sealing surface. Common failure forms include pits, scratches, pitting corrosion and other mechanical damage. Therefore, reliable maintenance methods must be used to restore the sealing and integrity of the primary circuit pressure boundary and repair the defects of the pressure vessel flange sealing surface.

[0003] Due to the layout of nuclear reactor pressure vessel equipment, on-site repair conditions, non-disassembly and radioactivity, the equipment cannot be returned to the factory and conventional mechanical processing equipment cannot achieve effective repair, so it is necessary to use special equipment to carry out online processing and repair. At present, domestic nuclear power plants have not implemented online processing and repair cases of pressure vessel flange sealing surfaces, nor do they have mature special repair device products, and have not formed processes and methods suitable for engineering practice in the field of nuclear power operation and maintenance, resulting in nuclear power technicians being unable to effectively carry out online intelligent repair of defects on pressure vessel flange sealing surfaces.

[0004] In order to ensure the safety and reliability of the online repair process of the flange sealing surface of the pressure vessel and the requirements of the technical indicators after the repair, it is necessary to fully consider the radioactive environment of the pressure vessel, the structural characteristics of the flange sealing surface, and the installation positioning, centering adjustment, machining and cutting, waste chip collection and other process requirements of the special repair device when it is used on site. In order to meet the above needs, it is necessary to invent an online machining and repair device for the flange sealing surface of a nuclear reactor pressure vessel. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an online processing and repair device for the flange sealing surface of a nuclear reactor pressure vessel, so as to solve the problem that in the current maintenance process of the reactor pressure vessel of a pressurized water reactor nuclear power plant, the flange sealing surface cannot be repaired online intelligently, and the goal of ensuring the sealing and integrity of the primary circuit pressure boundary through reliable maintenance means is achieved.

[0006] The present invention provides an online processing and repairing device for the sealing surface of a nuclear reactor pressure vessel flange, comprising: a base mechanism, a spindle rotating mechanism, a cutting arm beam, and a dust collecting mechanism;

[0007] The base mechanism is coaxially arranged with the cylinder of the pressure vessel and supported on the inner wall of the cylinder of the pressure vessel; a hole structure is arranged at the center of the base mechanism, and the main shaft rotating mechanism is adaptively connected to the hole structure of the base mechanism; the cutting arm beam is horizontally arranged and fixedly connected to the upper end surface of the main shaft rotating mechanism through a pressing plate, and the cutting arm beam is driven to rotate through the main shaft rotating mechanism, and the tool at the head of the cutting arm beam is driven to perform online processing and repair on the sealing surface of the flange of the nuclear reactor pressure vessel;

[0008] The shielding mechanism is located at the lower part of the base mechanism, installed on the supporting surface of the hanging basket inside the pressure vessel, and fits with the inner wall of the pressure vessel cylinder;

[0009] The dust suction mechanism is connected to the side wall of the cutting arm beam, and the dust suction mechanism rotates synchronously with the cutting arm beam to realize follow-up dust suction, which is used to prevent foreign objects such as debris from falling into the pressure vessel.

[0010] In a specific embodiment of the present invention, the base mechanism includes a base, an electric rapid expansion mechanism, an auxiliary support rod, a rough leveling mechanism and a center adjustment push rod;

[0011] Electric quick tightening mechanisms are evenly arranged on the sides of the base;

[0012] A hole structure is provided in the center of the base for installing the spindle rotation mechanism;

[0013] Several groups of rough leveling mechanisms and several groups of center adjustment push rods are installed on the upper surface of the base.

[0014] Center adjustment push rods are evenly arranged around the main shaft rotating mechanism; the front end of the center adjustment push rods presses against the main shaft rotating mechanism;

[0015] The bottom surface of the base is provided with a plurality of groups of auxiliary support rods for auxiliary supporting the base mechanism on the shielding mechanism.

[0016] In a specific embodiment of the present invention, the base as a whole is a regular octagonal column structure, and an electric rapid expansion mechanism is installed on each side of the base.

[0017] In a specific embodiment of the present invention, the coarse leveling mechanism includes a contour block and a support beam;

[0018] The main body of the support beam is welded from I-shaped steel and fixedly connected to the corresponding position on the upper surface of the base;

[0019] The front end of the support beam is pressed on the equal height block.

[0020] In a specific embodiment of the present invention, the tail end of the electric rapid expansion mechanism is fixedly connected to the side of the base, and the front end is supported on the inner wall of the pressure vessel cylinder to provide support for the device; the electric rapid expansion mechanism is provided with several groups;

[0021] The electric rapid expansion mechanism comprises a tensioning block, an expansion rod, a fixed nut seat, a fixed bracket, a rear transmission rod, a drive mechanism mounting frame, and an expansion drive mechanism; the fixed nut seat and the drive mechanism mounting frame are mounted on the front and rear ends of the fixed bracket; the expansion rod is screwed into the fixed nut seat; the tensioning block is mounted on the front end of the expansion rod; the rear transmission rod is mounted on the tail of the expansion rod; the expansion drive mechanism is fixed to the drive mechanism mounting frame by bolts; the expansion drive mechanism drives the expansion rod to rotate, and the tensioning block moves horizontally, and rapid expansion can be achieved by controlling the synchronous rotation of the motor.

[0022] In a specific embodiment of the present invention, the tightening block includes a front tightening block, an adjusting screw and a rear adjusting block; the front tightening block and the rear adjusting block are movably connected through a dovetail groove and an adjusting screw, and the front tightening block and the rear adjusting block are able to slide relative to each other in a vertical direction through the adjusting screw.

[0023] In a specific embodiment of the present invention, the spindle rotation mechanism includes a spindle drive mechanism, a rotating disk and a rotating disk bearing;

[0024] The rotating disk is fixedly connected to the outer ring of the turntable bearing; the spindle drive mechanism is fixedly connected to the rotating disk, and the output end of the spindle drive mechanism is provided with a rotating gear and an inner gear ring of the turntable bearing to form a main motion rotation system; an inner gear ring is provided on the inner side of the inner ring of the turntable bearing, and the inner gear ring meshes with the gear at the output end of the spindle drive mechanism during operation.

[0025] In a specific embodiment of the present invention, the cutting arm beam body is a rectangular tube structure, and a tool holder assembly is installed at the front end;

[0026] The tool holder assembly includes a radial feed motor, a radial slide rail module, a radial feed screw, a horizontal moving slide plate, an axial feed motor, an axial feed screw, an upper and lower slide seat, a tool holder rotating base and a tool mounting plate; the radial slide block module is installed at the front end of the cutting arm beam, and the radial feed motor drives the radial feed screw to rotate, thereby driving the horizontal moving slide plate to move horizontally along the guide rail; the axial feed screw is installed on the horizontal moving slide, and the axial feed motor drives the screw to rotate, thereby driving the upper and lower slide seats to move vertically along the guide rail; the tool holder rotating base is installed on the upper and lower slide seats, and the tool mounting plate is fixedly connected to the tool holder rotating base;

[0027] There are knives on the knife mounting plate.

[0028] In a specific embodiment of the present invention, the dust suction mechanism has two groups, including a dust collector, a dust suction tube and a dust suction head; the dust collector is fixedly connected to the side of the cutting arm group beam; the dust suction tube passes through the inside of the cutting arm beam; the dust suction head is trumpet-shaped, located directly in front of the tool holder assembly, and the angle is designed to be adjustable; the dust suction mechanism rotates synchronously with the cutting arm beam to achieve follow-up dust suction, which is used to prevent foreign matter such as debris from falling into the pressure vessel.

[0029] In a specific embodiment of the present invention, the shielding mechanism is two semicircular structures, and the two semicircular structures are connected by bolts to form a complete circular structure.

[0030] Compared with the prior art, the in-line processing and repairing device for the sealing surface of the flange of the nuclear reactor pressure vessel of the present invention can realize the in-line intelligent processing and repairing of the sealing surface of the flange of the reactor pressure vessel of the pressurized water reactor nuclear power plant; it is easy to install and has a stable structure, which can meet the on-site processing requirements of various types of pressurized water reactor units; it can meet the various process requirements of installation positioning, centering adjustment, processing cutting, waste chip collection, etc. during use. The device of the present invention has simple centering and leveling operations, can quickly realize the reliable installation and fixation of the device on the cylinder of the pressure vessel, and can effectively reduce the radiation dose of on-site workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of an online processing and repairing device for a nuclear reactor pressure vessel flange sealing surface according to the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of an electric rapid expansion mechanism in an online processing and repairing device for the sealing surface of a nuclear reactor pressure vessel flange according to the present invention;

[0033] Figure 3 It is a schematic structural diagram of a spindle rotating mechanism in an online processing and repairing device for a nuclear reactor pressure vessel flange sealing surface according to the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of a cutting arm beam in an online processing and repairing device for the sealing surface of a flange of a nuclear reactor pressure vessel according to the present invention;

[0035] In the figure: 10, base mechanism; 20, spindle rotation mechanism; 30, cutting arm beam; 40, dust suction mechanism; 50, shielding mechanism; 110, base; 120, electric quick tightening mechanism; 130, auxiliary support rod; 140, coarse leveling mechanism; 150, center adjustment push rod; 121, top tightening block; 122, tightening rod; 123, fixed nut seat; 124, fixed bracket; 125, rear end transmission rod; 126, drive mechanism mounting frame; 127, tightening drive mechanism; 1211, front top tightening block; 1212, adjustment Section screw; 1213, rear tightening block; 141, equal height block; 142, support beam; 21, spindle drive mechanism; 22, rotating disk; 23, turntable bearing; 31, tool holder assembly; 311 radial feed motor; 312, radial slide module; 313, radial feed screw; 314, horizontal moving slide; 315, axial feed motor; 316, axial feed screw; 317, upper and lower sliding seat; 318, tool holder rotating base; 319, tool mounting plate; 41, vacuum cleaner; 42, vacuum tube; 43, vacuum head. DETAILED DESCRIPTION

[0036] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0037] The nuclear reactor pressure vessel flange sealing surface online processing and repair device of the present invention is installed in the inner hole of the pressure vessel cylinder flange, and is equipped with two functions of turning and grinding, and the two functions can be quickly switched according to the working conditions. The control system is used as the core controller, and is equipped with remote monitoring and remote control functions. The main control cabinet is installed on the 20-meter platform of the nuclear island plant to reduce the radiation dose received by the operators.

[0038] The embodiment of the present invention discloses an on-line processing and repairing device for the sealing surface of a flange of a nuclear reactor pressure vessel, such as Figure 1 As shown, it includes: a base mechanism 10, a spindle rotation mechanism 20, a cutting arm beam 30, and a dust suction mechanism 40;

[0039] The base mechanism 10 is coaxially arranged with the cylinder of the pressure vessel and supported on the inner wall of the cylinder of the pressure vessel; a hole structure is arranged at the center of the base mechanism 10, and the spindle rotating mechanism 20 is adaptively connected to the hole structure of the base mechanism 10; the cutting arm beam 30 is horizontally arranged and fixedly connected to the upper end surface of the spindle rotating mechanism 20 through a pressing plate, and the cutting arm beam 30 is driven to rotate by the spindle rotating mechanism 20, so as to drive the tool at the head of the cutting arm beam 30 to perform online processing and repair on the sealing surface of the flange of the nuclear reactor pressure vessel;

[0040] The shielding mechanism 50 is located at the lower part of the base mechanism, mounted on the supporting surface of the hanging basket inside the pressure vessel, and fits against the inner wall of the pressure vessel cylinder;

[0041] The dust suction mechanism 40 is connected to the side wall of the cutting arm beam 30, and the dust suction mechanism 40 rotates synchronously with the cutting arm beam 30 to achieve follow-up dust suction, which is used to prevent foreign matter such as debris from falling into the pressure vessel.

[0042] The structure of each component is described in detail below.

[0043] The base mechanism 10 includes a base 110, an electric quick tensioning mechanism 120, an auxiliary support rod 130, a rough leveling mechanism 140 and a center adjustment push rod 150;

[0044] The electric quick tightening mechanism 120 is evenly arranged on the side of the base 110;

[0045] Specifically, the base 110 is a regular octagonal column structure as a whole, and an electric quick tightening mechanism 120 is installed on each side of the base 110 .

[0046] like Figure 2 As shown, the tail end of the electric quick tensioning mechanism 120 is fixedly connected to the side of the base 110 by bolts, and the front end is supported on the inner wall of the pressure vessel cylinder to provide support for the device; the electric quick tensioning mechanism 120 has a total of eight groups, including a tightening block 121, an expansion rod 122, a fixed nut seat 123, a fixed bracket 124, a rear end transmission rod 125, a drive mechanism mounting frame 126, and an expansion driving mechanism 127; the fixed nut seat 123 and the drive mechanism mounting frame 126 are installed on the front and rear ends of the fixed bracket 124; the expansion rod 122 is screwed into the fixed nut seat 123; the tightening block 121 is installed at the front end of the expansion rod 122; the rear end transmission rod 125 is installed at the tail of the expansion rod 122; the expansion driving mechanism 127 is fixed to the drive mechanism mounting frame 126 by bolts; the expansion driving mechanism 127 drives the expansion rod 122 to rotate, and the tightening block 121 moves horizontally, and rapid tension can be achieved by controlling the synchronous rotation of eight motors.

[0047] The tightening block 121 includes a front tightening block 1211, an adjusting screw 1212 and a rear adjusting block 1213; the front tightening block 1211 and the rear adjusting block 1213 are movably connected through a dovetail groove and the adjusting screw 1212, and the front tightening block 1211 and the rear adjusting block 1213 can slide relative to each other in the vertical direction through the adjusting screw 1212.

[0048] A hole structure is provided at the center of the base 110 for installing the spindle rotating mechanism 20;

[0049] Several groups of rough leveling mechanisms 140 and several groups of center adjustment push rods 150 are installed on the upper surface of the base 110; specifically, four groups of rough leveling mechanisms 140 and four groups of center adjustment push rods 150 are installed on the upper surface of the base 110;

[0050] Center adjustment push rods 150 are evenly arranged around the spindle rotation mechanism 20 for precise centering;

[0051] The front end of the center adjustment push rod 150 presses against the main shaft rotating mechanism 20;

[0052] The coarse leveling mechanism 140 is used for coarse leveling after the base mechanism 10 is installed, and includes a height equalization block 141 and a support beam 142;

[0053] The main body of the support beam 142 is welded from I-shaped steel and fixedly connected to the corresponding position on the upper surface of the base 110;

[0054] The front end of the support beam 142 is pressed on the equal height block 141 .

[0055] The coarse leveling mechanism 140 can ensure that the levelness of the entire device relative to the flange sealing surface of the pressure vessel is within 1 mm.

[0056] like Figure 3 As shown, the spindle rotating mechanism 20 includes a spindle driving mechanism 21, a rotating disk 22 and a turntable bearing 23; the rotating disk 22 is fixedly connected to the outer ring of the turntable bearing 23; the spindle driving mechanism 21 is fixedly connected to the rotating disk 22, and the output end of the spindle driving mechanism 21 is provided with a rotating gear and the inner gear ring of the turntable bearing 23 to form a main motion rotation system; the inner ring of the turntable bearing 23 is provided with a flange, and the flange is provided with eight bolt holes, two bolt holes are in a group, and four groups of holes are evenly distributed along the circumferential direction; an inner gear ring is provided on the inner side of the inner ring of the turntable bearing 23, and the inner gear ring is meshed with the gear at the output end of the spindle driving mechanism 21 during operation;

[0057] The inner diameter of the rotating disk 22 is the same as the outer diameter of the outer ring of the turntable bearing 23. Bolt holes are provided on the rotating disk 22 along the circumferential direction close to the outer circle for fixing the rotating disk 22 on the turntable bearing 23 by bolts.

[0058] like Figure 4 As shown, the main body of the cutting arm beam 30 is a rectangular tube structure, and a tool holder assembly 31 is installed at the front end;

[0059] The tool holder assembly 31 includes a radial feed motor 311, a radial slide rail module 312, a radial feed screw 313, a horizontal moving slide 314, an axial feed motor 315, an axial feed screw 316, an upper and lower slide seat 317, a tool holder rotating base 318 and a tool mounting plate 319; the radial slide block module 312 is installed at the front end of the cutting arm beam 30, and the radial feed motor 311 drives the radial feed screw 313 to rotate, thereby driving the horizontal moving slide 314 to move horizontally along the guide rail; the axial feed screw 316 is installed on the horizontal moving slide 314, and the axial feed motor 315 drives the screw to rotate, thereby driving the upper and lower slide seats 317 to move vertically along the guide rail; the tool holder rotating base 318 is installed on the upper and lower slide seats 317, and the tool mounting plate 319 is fixedly connected to the tool holder rotating base 318;

[0060] There are knives on the knife mounting plate.

[0061] The dust suction mechanism 40 has two groups, including a dust collector 41, a dust suction pipe 42 and a dust suction head 43; the dust collector 41 is fixedly connected to the side of the cutting arm group beam 30; the dust suction pipe 42 passes through the inside of the cutting arm beam 30; the dust suction head 43 is in a trumpet shape, located just in front of the tool holder assembly, and the angle is designed to be adjustable; the dust suction mechanism 40 rotates synchronously with the cutting arm beam 30 to achieve follow-up dust suction, which is used to prevent foreign matter such as debris from falling into the pressure vessel.

[0062] Four groups of auxiliary support rods 130 are provided on the bottom surface of the base 110 for auxiliary supporting the base mechanism 10 on the shielding mechanism 50 .

[0063] The shielding mechanism 50 is two semicircular structures, which are connected by bolts to form a complete circular structure. The shielding mechanism 50 is designed with two detachable guide structures, which are used to cooperate with the core guide columns during the lifting process to avoid collision between the shielding mechanism and the pressure vessel. The shielding mechanism 50 is used to shield the radiation dose of the pressure vessel to reduce it to an acceptable level for humans and equipment, and can also prevent foreign matter from falling into the pressure vessel.

[0064] The installation method of the nuclear reactor pressure vessel flange sealing surface online processing and repairing device of the present invention comprises the following steps:

[0065] S1: Eight electric quick tensioning mechanisms 120 size pre-adjustment;

[0066] S2: Place four equal height blocks 141 on the pressure vessel bolt hole flanges;

[0067] S3: hoist the online processing and repairing device into the pressure vessel cylinder, overlap the support beam 142 on the equal height block 141, and check that the support beam 142 and the equal height block 141 are in reliable contact;

[0068] S4: The eight electric quick expansion mechanisms 120 extend synchronously and are initially expanded and tightened on the inner wall of the pressure vessel cylinder;

[0069] S5: Initial leveling: Slowly rotate the cutting arm beam 30, measure the distance between the cutting arm beam 30 and the sealing surface of the pressure vessel flange at the four electric quick tightening mechanisms 120, find the high point of the online processing and repair device and make adjustments to ensure that the flatness of the device is within 1 mm;

[0070] S6: Initial alignment: Slowly rotate the cutting arm beam 30 again, measure the coaxiality of the electric quick tightening mechanism 120 relative to the inner wall of the flange sealing surface of the pressure vessel, and make adjustments based on the measurement results to ensure that the coaxiality is within 1 mm;

[0071] S7: dismantling the rough leveling mechanism 140;

[0072] S8: Fine leveling: Slowly rotate the cutting arm 30, use a meter to measure the height of each point relative to the flange sealing surface of the pressure vessel, and adjust the top tightening block 121 of the electric quick tightening mechanism 120 to complete the horizontal calibration within 0.05mm;

[0073] S9: Precision alignment: Slowly rotate the cutting arm 30 again, measure the coaxiality of each point relative to the inner circle of the step between the flange sealing surface of the pressure vessel and the flange surface of the bolt hole, and adjust the center adjustment push rod 150 of the base mechanism 10 to complete the coaxiality calibration within 0.05mm;

[0074] S10: After the horizontality and coaxiality of the online processing repair device relative to the flange sealing surface of the pressure vessel meet the requirements, the eight electric quick tightening mechanisms 120 are finally tightened;

[0075] S11: Recheck the horizontality and coaxiality: Measure the horizontality and coaxiality of the online processing and repair device relative to the flange sealing surface of the pressure vessel by using a meter, and make fine adjustments based on the review results;

[0076] S12: appropriately supporting the auxiliary support rod 130 of the online processing and repairing device on the shielding mechanism 50;

[0077] S13: The online processing and repair device is installed.

[0078] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0079] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online processing and repairing device for the sealing surface of a nuclear reactor pressure vessel flange, characterized in that: include: A base mechanism (10), a spindle rotation mechanism (20), a cutting arm beam (30), and a dust suction mechanism (40); The base mechanism (10) is coaxially arranged with the cylinder of the pressure vessel and supported on the inner wall of the cylinder of the pressure vessel; a hole structure is arranged at the center of the base mechanism (10), and the main shaft rotating mechanism (20) is adaptively connected to the hole structure of the base mechanism (10); the cutting arm beam (30) is arranged horizontally and fixedly connected to the upper end surface of the main shaft rotating mechanism (20) through a pressure plate, and the cutting arm beam (30) is driven to rotate by the main shaft rotating mechanism (20), so as to drive the tool at the head of the cutting arm beam (30) to perform online processing and repair on the sealing surface of the flange of the nuclear reactor pressure vessel; The shielding mechanism (50) is located at the lower part of the base mechanism, mounted on the supporting surface of the hanging basket inside the pressure vessel, and is in contact with the inner wall of the pressure vessel cylinder; The dust suction mechanism (40) is connected to the side wall of the cutting arm beam (30), and the dust suction mechanism (40) rotates synchronously with the cutting arm beam (30) to realize follow-up dust suction, so as to prevent foreign matter such as debris from falling into the interior of the pressure vessel.

2. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 1 is characterized in that: The base mechanism (10) comprises a base (110), an electric quick expansion mechanism (120), an auxiliary support rod (130), a rough leveling mechanism (140) and a center adjustment push rod (150); Electric quick tightening mechanisms (120) are evenly arranged on the sides of the base (110); A hole structure is provided at the center of the base (110) for installing the spindle rotating mechanism (20); A plurality of groups of rough leveling mechanisms (140) and a plurality of groups of center adjustment push rods (150) are installed on the upper surface of the base (110). Center adjustment push rods (150) are evenly arranged around the main shaft rotation mechanism (20); the front end of the center adjustment push rod (150) is pressed against the main shaft rotation mechanism (20); The bottom surface of the base (110) is provided with a plurality of groups of auxiliary support rods (130) for auxiliaryly supporting the base mechanism (10) on the shielding mechanism (50).

3. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 2 is characterized in that: The base (110) is an octagonal column structure as a whole, and an electric quick tightening mechanism (120) is installed on each side of the base (110).

4. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 2 is characterized in that: The rough leveling mechanism (140) comprises a height-conforming block (141) and a support beam (142); The main body of the support beam (142) is welded from I-shaped steel and is fixedly connected to a corresponding position on the upper surface of the base (110); The front end of the support beam (142) is pressed on the equal height block (141).

5. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 2 is characterized in that: The tail end of the electric quick expansion mechanism (120) is fixedly connected to the side of the base (110), and the front end is supported on the inner wall of the pressure vessel cylinder to provide support force for the device; the electric quick expansion mechanism (120) is provided with a plurality of groups; The electric quick tensioning mechanism (120) comprises a tensioning block (121), an expansion rod (122), a fixed nut seat (123), a fixed bracket (124), a rear transmission rod (125), a drive mechanism mounting frame (126), and an tensioning drive mechanism (127); the fixed nut seat (123) and the drive mechanism mounting frame (126) are mounted on the front and rear ends of the fixed bracket (124); the expansion rod (122) is screwed into the fixed nut seat (123); the tensioning block (121) is mounted on the front end of the expansion rod (122); the rear transmission rod (125) is mounted on the tail of the expansion rod (122); the tensioning drive mechanism (127) is fixed to the drive mechanism mounting frame (126) by bolts; the tensioning drive mechanism (127) drives the expansion rod (122) to rotate, and the tensioning block (121) moves horizontally, and quick tensioning can be achieved by controlling the synchronous rotation of the motor.

6. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 5 is characterized in that: The tightening block (121) comprises a front tightening block (1211), an adjusting screw (1212) and a rear adjusting block (1213); the front tightening block (1211) and the rear adjusting block (1213) are movably connected via a dovetail groove and the adjusting screw (1212), and the front tightening block (1211) and the rear adjusting block (1213) are able to slide relative to each other in a vertical direction via the adjusting screw (1212).

7. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 1 is characterized in that: The spindle rotating mechanism (20) comprises a spindle driving mechanism (21), a rotating disk (22) and a rotating disk bearing (23); The rotating disk (22) is fixedly connected to the outer ring of the turntable bearing (23); the main shaft driving mechanism (21) is fixedly connected to the rotating disk (22); the main shaft driving mechanism (21) output end is provided with a rotating gear and an inner gear ring of the turntable bearing (23) to form a main motion rotary system; an inner gear ring is provided on the inner side of the inner ring of the turntable bearing (23); during operation, the inner gear ring is meshed with a gear at the output end of the main shaft driving mechanism (21).

8. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 1 is characterized in that: The main body of the cutting arm beam (30) is a rectangular tube structure, and a tool holder assembly (31) is installed at the front end; The tool holder assembly (31) comprises a radial feed motor (311), a radial slide rail module (312), a radial feed screw (313), a horizontally movable slide plate (314), an axial feed motor (315), an axial feed screw (316), an upper and lower slide seat (317), a tool holder rotating base (318) and a tool mounting plate (319); the radial slide block module (312) is mounted at the front end of the cutting arm beam (30), and the radial feed motor (311) drives the radial feed screw (313) to rotate, thereby driving the horizontally movable slide plate (314) to move horizontally along the guide rail; the axial feed screw (316) is mounted on the horizontally movable slide plate (314), and the axial feed motor (315) drives the screw to rotate, thereby driving the upper and lower slide seats (317) to move vertically along the guide rail; the tool holder rotating base (318) is mounted on the upper and lower slide seats (317), and the tool mounting plate (319) is fixedly connected to the tool holder rotating base (318); The tool mounting plate (319) is provided with a tool.

9. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 1, characterized in that: The dust suction mechanism (40) has two groups, including a dust suction device (41), a dust suction pipe (42) and a dust suction head (43); the dust suction device (41) is fixedly connected to the side of the cutting arm assembly beam (30); the dust suction pipe (42) passes through the inside of the cutting arm beam (30); the dust suction head (43) is in a trumpet shape, located in front of the tool holder assembly, and its angle is designed to be adjustable; the dust suction mechanism (40) rotates synchronously with the cutting arm beam (30) to realize follow-up dust suction, which is used to prevent foreign matter such as debris from falling into the pressure vessel.

10. The nuclear reactor pressure vessel flange sealing surface online processing and repairing device according to claim 1, characterized in that: The shielding mechanism (50) is two semicircular structures, which are connected by bolts to form a complete circular structure.

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