CN116275273A - Circular cutting device and circular cutting method for cylinder body of reactor pressure vessel - Google Patents

Abstract

The invention provides a reactor pressure vessel cylinder ring cutting device, which comprises a supporting module, a rotating module for driving a cylinder to rotate, a cutting module for cutting the cylinder, and a clamping and transporting module for carrying, positioning and transporting a cut ring section.

Description

Circular cutting device and circular cutting method for cylinder body of reactor pressure vessel

Technical Field

The invention belongs to the technical field of radioactive metal waste cutting and volume reduction, and particularly relates to a reactor pressure vessel cylinder annular cutting device and an annular cutting method.

Background

The reactor of the nuclear power station generally has the service life of 40-60 years, and after the operation is finished, decommissioning work such as cutting, dismantling, servicing and the like is carried out according to relevant national regulations. In the decommissioning engineering, the large-scale radioactive metal waste is required to be cut and prepared so as to reduce the space occupation ratio and achieve the purposes of reducing the waste disposal volume and the disposal cost, so that the large-scale radioactive metal waste cutting technology is one of the requisite technologies of the nuclear power decommissioning engineering.

Cutting large-scale nuclear island main equipment is one of the most complicated and difficult technologies and projects, at present, no system is developed in China to research the cutting technology of the large-scale nuclear island main equipment, taking a common large-scale nuclear island main equipment, namely a reactor pressure vessel as an example, and the equipment sequentially comprises a nozzle section, a straight barrel section and a bottom seal head from top to bottom, and a plurality of difficulties exist in cutting:

(1) The equipment has large volume, thick wall thickness and heavy weight, specifically, the equipment has the height of about 10 meters, the diameter of about 5 meters, the thickness of a main body of 170mm, the maximum thickness of 850mm at the flange of the nozzle section, the weight of 130 tons and the cutting workload of large.

(2) The equipment directly contains a fuel cladding, is irradiated by neutrons for a long time, has high radioactive radiation dosage, is contacted with a high-radioactive coolant for a long time, has ultrahigh dosage of a surface activation layer, and is difficult for personnel to access.

Aiming at the special structure of the reactor pressure vessel cylinder and the cutting problems, the invention provides a reactor pressure vessel cylinder annular cutting device and an annular cutting method, which can cut the reactor pressure vessel cylinder into a bottom sealing head, a middle annular body and a nozzle flange annular region, wherein the middle annular body can be cut into a plurality of annular cutting blocks so as to carry out subsequent small block cutting work.

Disclosure of Invention

In view of the above, the present invention is directed to a device and a method for annular cutting of a cylinder of a reactor pressure vessel.

In order to achieve the above purpose, the product in the technical scheme adopted by the invention is a reactor pressure vessel cylinder ring cutting device, comprising:

the support module is used for supporting the reactor pressure vessel cylinder and comprises a bottom plate, a fixed support ring and a first lifting leg, wherein the fixed support ring is arranged above the bottom plate in a vertically movable manner, the first lifting leg extends in the vertical direction, the bottom of the first lifting leg is connected with the bottom plate, the top of the first lifting leg is connected with the fixed support ring, and the fixed support ring can be driven to move up and down when the first lifting leg stretches;

the rotary module is used for driving the cylinder body to rotate along the axis of the rotary module and comprises a rotary support ring and a driving assembly, wherein the rotary support ring is rotatably arranged on the fixed support ring, the driving assembly is used for driving the rotary support ring to rotate, the rotary support ring is equal to the inner diameter and the outer diameter of the fixed support ring and is coaxially arranged, a positioning clamping groove matched with a nozzle section of the cylinder body is formed in the rotary support ring, and the driving assembly is connected to the side wall of the fixed support ring;

a cutting module for cutting the cylinder; the cutting module comprises a fixed support, a telescopic arm, a radial sliding table, a cutting motor, a circular saw blade and a radial feeding motor, wherein the fixed support is connected to the side wall of the fixed support ring, the telescopic arm is connected to the bottom of the fixed support in a telescopic manner and extends downwards and vertically, the radial sliding table is connected to the bottom of the telescopic arm and extends along the radial direction of the cylinder body, the cutting motor is connected to the radial sliding table in a sliding manner, the circular saw blade is connected to an output shaft of the cutting motor, the plane where the circular saw blade is located is parallel to a horizontal plane, and the radial feeding motor is used for driving the cutting motor to slide along the radial sliding table so that the circular saw blade is close to or far away from the cylinder body;

the clamping and transporting module is used for receiving, positioning and transporting the cut ring segments; the clamping and transporting module comprises a transferring plate, a supporting plate, a second lifting leg, a positioning supporting ring and a bearing plate, wherein the transferring plate is horizontally movably erected on a sliding rail arranged on the bottom plate, the bearing plate is rotatably arranged on the transferring plate through bearing steel balls, the supporting plate is vertically movably arranged above the transferring plate through the second lifting leg, and the positioning supporting ring is connected to the supporting plate and used for framing the bottom of the cylinder body so as to prevent the cylinder body from toppling over;

the transfer plate is provided with a bearing working position and a shifting-out working position, when the transfer plate is in the bearing working position, the transfer plate moves to the lower part of the rotary supporting ring, so that the rotation axis of the bearing plate coincides with the rotation axis of the rotary supporting ring, the bottom of the cylinder body can be supported on the bearing plate and rotate together with the bearing plate, the ring section cut by the cutting module can be vertically placed on the bearing plate, and when the transfer plate is in the shifting-out working position, the transfer plate moves away the bearing plate from the lower part of the rotary supporting ring, so that the ring section is separated from the cylinder body for lifting.

Preferably, the upper surface of the transfer plate is provided with an annular steel ball groove for placing the bearing steel balls.

Further preferably, the upper surface of the transfer plate is further provided with a containing groove for containing the bearing plate for rotation, and the steel ball groove is formed in the bottom wall of the containing groove.

Preferably, a pressure sensor is arranged between the top of the first lifting leg and the fixed supporting ring, the pressure sensor is used for detecting the pressure applied to the rotary supporting ring by the cylinder, and when the detection value of the pressure sensor is smaller than a set value, the driving assembly drives the rotary supporting ring to rotate.

Preferably, the driving assembly comprises a driving motor and a transmission unit, the driving motor is connected to the side wall of the fixed supporting ring, the transmission unit comprises a friction wheel arranged on an output shaft of the driving motor, and the outer wall of the friction wheel is attached to and abutted against the outer wall of the rotary supporting ring.

Preferably, the positioning support ring is semicircular, the positioning support ring is arranged in an openable manner, and when the transfer plate is in the receiving working position, the positioning support ring is symmetrically distributed on two sides of the cylinder body.

Further preferably, the support plate is further provided with a hydraulic cylinder for driving the positioning support ring to open and close, and when the hydraulic cylinder drives the positioning support ring to close, the inner wall of the positioning support ring is rotationally connected with the inner wall of the cylinder.

Further preferably, the positioning support ring comprises a ring body, a retainer connected to one side of the ring body facing the cylinder, and a plurality of rolling bodies rotatably embedded in the retainer, wherein when the positioning support ring is folded, the rolling bodies are contacted with the outer wall of the cylinder, so that the cylinder can rotate conveniently.

Further preferably, the positioning support ring further comprises an attaching ring rotatably arranged on the ring body through the rolling bodies, and when the positioning support ring is folded and the cylinder rotates, the attaching ring follows the cylinder to rotate, and moves from one positioning support ring to the other positioning support ring.

In order to achieve the above object, the method in the technical scheme provided by the invention is a method for cutting a cylinder of a reactor pressure vessel, the method for cutting the cylinder of the reactor pressure vessel by adopting any one of the reactor pressure vessel cutting devices according to the claims, and the method for cutting the cylinder of the reactor pressure vessel comprises the following steps:

s1, extending a first lifting leg to the highest position, and moving a transfer plate to a receiving working position;

s2, hoisting the cylinder to be cut above the rotary support ring and falling the cylinder to enable the cylinder to be erected on the rotary support body, and enabling the positioning support ring to frame the bottom of the cylinder;

s3, retracting the first lifting leg to enable the lowest point of the cylinder to be supported on the bearing plate, so that the weight of the cylinder shared by the rotary supporting frames is not more than 5% of the dead weight of the cylinder;

s4, changing the extension length of the telescopic arm, and adjusting the circular saw blade to a set height; changing the extension length of the second lifting leg, and adjusting the positioning support ring to a set height;

s5, starting a cutting motor and a radial advancing motor, and utilizing the radial advancing motor to push the cutting motor and the circular saw blade to gradually advance towards the axial line direction of the cylinder until the depth of the circular saw blade extending into the cylinder is larger than the wall thickness of the cylinder at the position;

s6, driving the rotary supporting ring to rotate through the driving assembly, so that the cylinder body rotates around the axis of the cylinder body to realize ring cutting;

s7, after the circular cutting is completed, the cutting motor is turned off, and the cutting motor and the circular saw blade are driven to return to the original position by the radial moving motor;

s8, lifting the first lifting leg to separate the cylinder body from the cut ring section;

s9, moving the transfer plate to a working position so as to hoist the cut ring segments;

s10, repeating the steps S1-S10, and carrying out subsequent circular cutting.

Due to the adoption of the technical scheme, compared with the prior art, the reactor pressure vessel cylinder annular cutting device provided by the invention has the beneficial effects that:

1. the circular cutting device integrally adopts the design of mutually matching multiple modules, so that the structure is more stable, and the functions are more diversified.

2. The reactor pressure vessel cutting and preparing operation can be realized through remote control, and the radiation dose received by operators can be reduced as much as possible.

3. Because the existence of pressing from both sides tight transport module, in the cutting process, can utilize the loading board to provide a part holding power, reduce the pressure that the barrel applyed on rotatory holding ring to reduce the frictional force between rotatory holding ring and the fixed support ring, reduce the moment that drive assembly needs to provide, can also make the barrel bottom support tightly on the loading board at the ring cutting in-process, avoid rocking, the cutting is effectual, after the ring cutting is accomplished, can also utilize the location holding ring to avoid the ring section to empty, make it keep vertical state follow transfer board shift out, the handling is more convenient.

4. The circular saw blade has relatively less heat and chips generated by cutting, the notch is smoother, the generation amount of secondary pollutants is small, and other modules can be conveniently matched for action.

Due to the adoption of the technical scheme, compared with the prior art, the reactor pressure vessel cylinder body circular cutting method provided by the invention has the beneficial effects that:

1. the driving moment required by the cylinder body when the cylinder body is converted from static state to rotation can be greatly reduced, so that the type selection of the driving assembly is optimized.

2. The cut ring segments can be vertically placed on the bearing plate and moved out along with the transfer plate, so that the lifting is more convenient.

3. The remote control can be conveniently realized without the need of approaching examination.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic front view of a preferred embodiment of a reactor pressure vessel barrel circumferential cutting apparatus of the present invention.

Fig. 2 is a schematic top view of fig. 1.

FIG. 3 is a schematic cross-sectional view taken in the direction A-A of FIG. 1.

Fig. 4 is a schematic cross-sectional view in the direction B-B of fig. 2.

Fig. 5 is a perspective view of fig. 1.

Fig. 6 is a schematic front view of the transfer plate of fig. 1 in a removed operative position.

Fig. 7 is a perspective view of fig. 6.

Fig. 8 is a perspective view of the cartridge of fig. 1 after placement.

Fig. 9 is a schematic perspective view of the lower section of the cutting drum straight section of fig. 8 after removal.

Fig. 10 is a schematic perspective view of the fig. 8 cut cylinder straight section after removal of the section.

Fig. 11 is a partially enlarged schematic view at C in fig. 3.

Wherein:

10. a support module; 11. a bottom plate; 12. fixing the support ring; 13. a first lifting leg; 14. a slide rail; 15. a pressure sensor; 20. a rotation module; 21. rotating the support ring; 211. positioning clamping grooves; 22. a drive assembly; 221. a driving motor; 222. a friction wheel; 30. a cutting module; 31. a fixed bracket; 32. a telescoping arm; 33. a radial sliding table; 34. a cutting motor; 35. a circular saw blade; 36. a radial feed motor; 40. clamping the transport module; 41. a transfer plate; 411. weighing the steel balls; 412. a steel ball groove; 413. a receiving groove; 42. a support plate; 43. a second lifting leg; 44. positioning a support ring; 441. a ring body; 442. a retainer; 443. a rolling element; 444. a laminating ring; 45. a carrying plate; 46. a hydraulic cylinder; 51. a nozzle section; 52. a straight barrel section; 53. and a bottom sealing head.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

As shown in fig. 1 to 11, the reactor pressure vessel cylinder ring cutting device provided by the invention comprises: the support module 10 is used for supporting a reactor pressure vessel cylinder, the support module 10 comprises a bottom plate 11, a fixed support ring 12 and first lifting legs 13, the fixed support ring 12 is arranged above the bottom plate 11 in a vertically movable mode, the first lifting legs 13 extend in the vertical direction, the bottoms of the first lifting legs 13 are connected with the bottom plate 11, the tops of the first lifting legs 13 are connected with the fixed support ring 12, the four first lifting legs 13 are uniformly distributed around the axial lead of the fixed support ring 12, and when the first lifting legs 13 stretch, the fixed support ring 12 can be driven to move up and down relative to the bottom plate 11; the rotary module 20 is used for driving the cylinder to rotate along the axis of the rotary module 20, the rotary module 20 comprises a rotary support ring 21 rotatably arranged on the fixed support ring 12 and a driving component 22 used for driving the rotary support ring 21 to rotate, the inner diameter and the outer diameter of the rotary support ring 21 are equal to those of the fixed support ring 12, the rotary support ring 21 and the fixed support ring 12 are coaxially arranged, a positioning clamping groove 211 matched with a nozzle section 51 of the cylinder is arranged on the rotary support ring 21, the driving component 22 is connected to the side wall of the fixed support ring 12, and specifically, the driving unit comprises a friction wheel 222 arranged on an output shaft of a driving motor 221, and the outer wall of the friction wheel 222 is adhered to and abutted against the outer wall of the rotary support ring 21; the cutting module 30 is used for cutting a barrel, the cutting module 30 comprises a fixed support 31, a telescopic arm 32, a radial sliding table 33, a cutting motor 34, a circular saw blade 35 and a radial feeding motor 36, the fixed support 31 is connected to the side wall of the fixed support ring 12, the telescopic arm 32 is connected to the bottom of the fixed support 31 in a telescopic way and extends downwards vertically, the radial sliding table 33 is connected to the bottom of the telescopic arm 32 and extends along the radial direction of the barrel, the cutting motor 34 is connected to the radial sliding table 33 in a sliding way, the circular saw blade 35 is connected to the output shaft of the cutting motor 34, the plane of the circular saw blade 35 is parallel to the horizontal plane, and the radial feeding motor 36 is used for driving the cutting motor 34 to slide along the radial sliding table 33 so as to enable the circular saw blade 35 to approach or separate from the barrel; the clamping and transporting module 40 is used for receiving, positioning and transporting the cut ring segments, the clamping and transporting module 40 comprises a transferring plate 41, a supporting plate 42, a second lifting leg 43, a positioning supporting ring 44 and a bearing plate 45, the transferring plate 41 is horizontally movably arranged on a sliding rail 14 arranged on the bottom plate 11, the bearing plate 45 is rotatably arranged on the transferring plate 41 through a bearing steel ball 411, the supporting plate 42 is vertically movably arranged above the transferring plate 41 through the second lifting leg 43, and the positioning supporting ring 44 is connected on the supporting plate 42 and is used for framing the bottom of the cylinder so as to prevent the cylinder from toppling; the transfer plate 41 has a receiving working position and a removing working position, when the transfer plate 41 is in the receiving working position, the transfer plate 41 moves to the lower side of the rotary support ring 21, the rotation axis line of the bearing plate 45 coincides with the rotation axis line of the rotary support ring 21, the bottom of the cylinder body can be supported on the bearing plate 45 and rotate together with the bearing plate 45, the ring segment cut by the cutting module 30 can be vertically placed on the bearing plate 45, and when the transfer plate 41 is in the removing working position, the transfer plate 41 removes the bearing plate 45 from the lower side of the rotary support ring 21, so that the ring segment is separated from the cylinder body for lifting.

The advantages of this arrangement are that:

1. the design of mutually supporting of multimode is adopted, and the structure is more stable, and the function is more many times.

2. The reactor pressure vessel cutting and preparing operation can be realized through remote control, and the radiation dose received by operators can be reduced as much as possible.

3. Because the existence of pressing from both sides tight transport module, in the cutting process, can utilize the loading board to provide a part holding power, reduce the pressure that the barrel applyed on rotatory holding ring to reduce the frictional force between rotatory holding ring and the fixed support ring, reduce the moment that drive assembly needs to provide, can also make the barrel bottom support tightly on the loading board at the ring cutting in-process, avoid rocking, the cutting is effectual, after the ring cutting is accomplished, can also utilize the location holding ring to avoid the ring section to empty, make it keep vertical state follow transfer board shift out, the handling is more convenient.

4. The circular saw blade has relatively less heat and chips generated by cutting, the notch is smoother, the generation amount of secondary pollutants is small, and other modules can be conveniently matched for action.

5. Because the moment that the drive assembly needs to provide is less, can adopt less power, less volume, less weight's motor, in addition adopted friction wheel transmission's mode, when driving motor passes through the friction wheel and drives rotatory support ring rotation, can conveniently match the cutting progress of saw blade through the slip spin of friction wheel, avoid the saw blade phenomenon of tipping because of rotatory support ring rotates too fast, ensure that the saw blade can realize the circular cutting entirely. Specifically, when the circular saw blade cuts the barrel, the rotary support ring is actually subjected to the thrust force F1 of the circular saw blade, the thrust force F1 gradually decreases along with the cutting progress of the circular saw blade, after the barrel is completely cut off, the thrust force F1 is reduced to 0, at the moment, the friction wheel drives the rotary support ring to rotate, so that the barrel rotates, the feeding is equivalent, when the fracture part of the barrel is contacted with the edge of the circular saw blade, F1 gradually increases, when the fracture part is larger than the friction force F2 between the friction wheel and the rotary support ring, the friction wheel slides, the barrel does not rotate any more, and the feeding is no longer avoided, and the circular saw blade is prevented from tipping.

In the present embodiment, the upper surface of the transfer plate 41 is provided with an annular steel ball groove 412 for placing the bearing steel balls 411, and a receiving groove 413 for receiving the bearing plate 45 for rotation, and the steel ball groove 412 is provided on the bottom wall of the receiving groove 413, which is advantageous in that the bearing plate 45 can be prevented from shaking in the horizontal direction when rotating.

For precisely controlling the extending height of the first lifting leg 13, in this embodiment, a pressure sensor 15 is disposed between the top of the first lifting leg 13 and the fixed support ring 12, the pressure sensor 15 is used for detecting the pressure applied by the cylinder on the rotary support ring 21, and when the detection value of the pressure sensor 15 is smaller than the set value, the driving component 22 drives the rotary support ring 21 to rotate, so as to avoid overload of the driving component 22.

In this embodiment, the positioning support ring 44 is in a semicircle shape, two positioning support rings 44 are provided, and the two positioning support rings 44 can be opened and closed, specifically, two support plates 42 are provided, each support plate 42 is used for providing one support ring 44, and when the transfer plate 41 is in the receiving working position, the positioning support rings 44 and the support plates 42 are symmetrically distributed on two sides of the cylinder.

In order to conveniently realize the opening and closing of the positioning support ring 44, in this embodiment, the support plate 42 is further provided with a hydraulic cylinder 46 for driving the positioning support ring 44 to open and close, when the hydraulic cylinder 46 drives the positioning support ring 44 to close, the inner wall of the positioning support ring 44 is rotationally connected with the inner wall of the cylinder, further, the positioning support ring 44 includes a ring body 441, a retainer 442 connected to one side of the ring body 441 facing the cylinder, and a plurality of rolling bodies 443 rotatably embedded on the retainer 442, when the positioning support ring 44 is closed, the rolling bodies 443 are in contact with the outer wall of the cylinder so as to facilitate the rotation of the cylinder, further, in order to avoid the collision damage of the rolling bodies 443 at the positions of grooves, welding seams and the like on the outer wall of the cylinder, in this embodiment, the positioning support ring 44 further includes a lamination ring 444 rotatably arranged on the ring body 441 through the rolling bodies 443, specifically, the lamination ring 444 can be in an i-shaped, meanwhile, the ring body 441 is provided with a clamping groove in an i-shaped shape, when the positioning support ring 44 is closed and the cylinder rotates, the cylinder body 444 is rotationally embedded with a plurality of rolling bodies 443, one of the positioning support ring 44 is moved to the other positioning support ring 44, and the lamination ring 44 is contacted with the outer wall of the cylinder, and further lamination ring 444 is provided with an ultra-hard coating facing the side of the cylinder (ultra-hard coating) so as to realize the ultra-hard coating, and has low friction effect.

The invention also provides a method for cutting the cylinder body of the reactor pressure vessel, which adopts the device for cutting the cylinder body of the reactor pressure vessel to cut, and comprises the following steps:

s1, extending a first lifting leg to the highest position, and moving a transfer plate to a receiving working position;

s2, hoisting the cylinder to be cut above the rotary support ring and falling the cylinder to enable the cylinder to be erected on the rotary support body, and enabling the positioning support ring to frame the bottom of the cylinder;

s3, retracting the first lifting leg to enable the lowest point of the cylinder to be supported on the bearing plate, so that the weight of the cylinder shared by the rotary support frame is not more than 5% of the dead weight of the cylinder;

s4, changing the extension length of the telescopic arm, and adjusting the circular saw blade to a set height; changing the extension length of the second lifting leg, and adjusting the positioning support ring to a set height;

s5, starting a cutting motor and a radial advancing motor, and utilizing the radial advancing motor to push the cutting motor and the circular saw blade to gradually advance towards the axial line direction of the cylinder until the depth of the circular saw blade extending into the cylinder is larger than the wall thickness of the cylinder at the position;

s6, driving the rotary supporting ring to rotate through the driving assembly, so that the cylinder body rotates around the axis of the cylinder body to realize ring cutting;

s7, after the circular cutting is completed, the cutting motor is turned off, and the cutting motor and the circular saw blade are driven to return to the original position by the radial moving motor;

s8, lifting the first lifting leg to separate the cylinder body from the cut ring section;

s9, moving the transfer plate to a working position so as to hoist the cut ring segments;

s10, repeating the steps S1-S10, and carrying out subsequent circular cutting.

The advantages of this arrangement are that:

1. the driving moment required by the cylinder body when the cylinder body is converted from static state to rotation can be greatly reduced, so that the type selection of the driving assembly is optimized.

2. The cut ring segments can be vertically placed on the bearing plate and moved out along with the transfer plate, so that the lifting is more convenient.

3. The remote control can be conveniently realized without the need of approaching examination.

Further, the burden of rotating the weight of the cylinder on the support ring in step S3 is performed by a pressure sensor provided between the top of the first elevating leg and the fixed support ring.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims (10)

1. A reactor pressure vessel barrel ring cutting apparatus, comprising:

the support module is used for supporting the reactor pressure vessel cylinder and comprises a bottom plate, a fixed support ring and a first lifting leg, wherein the fixed support ring is arranged above the bottom plate in a vertically movable manner, the first lifting leg extends in the vertical direction, the bottom of the first lifting leg is connected with the bottom plate, the top of the first lifting leg is connected with the fixed support ring, and the fixed support ring can be driven to move up and down when the first lifting leg stretches;

the rotary module is used for driving the cylinder body to rotate along the axis of the rotary module and comprises a rotary support ring and a driving assembly, wherein the rotary support ring is rotatably arranged on the fixed support ring, the driving assembly is used for driving the rotary support ring to rotate, the rotary support ring is equal to the inner diameter and the outer diameter of the fixed support ring and is coaxially arranged, a positioning clamping groove matched with a nozzle section of the cylinder body is formed in the rotary support ring, and the driving assembly is connected to the side wall of the fixed support ring;

a cutting module for cutting the cylinder; the cutting module comprises a fixed support, a telescopic arm, a radial sliding table, a cutting motor, a circular saw blade and a radial feeding motor, wherein the fixed support is connected to the side wall of the fixed support ring, the telescopic arm is connected to the bottom of the fixed support in a telescopic manner and extends downwards and vertically, the radial sliding table is connected to the bottom of the telescopic arm and extends along the radial direction of the cylinder body, the cutting motor is connected to the radial sliding table in a sliding manner, the circular saw blade is connected to an output shaft of the cutting motor, the plane where the circular saw blade is located is parallel to a horizontal plane, and the radial feeding motor is used for driving the cutting motor to slide along the radial sliding table so that the circular saw blade is close to or far away from the cylinder body;

the clamping and transporting module is used for receiving, positioning and transporting the cut ring segments; the clamping and transporting module comprises a transferring plate, a supporting plate, a second lifting leg, a positioning supporting ring and a bearing plate, wherein the transferring plate is horizontally movably erected on a sliding rail arranged on the bottom plate, the bearing plate is rotatably arranged on the transferring plate through bearing steel balls, the supporting plate is vertically movably arranged above the transferring plate through the second lifting leg, and the positioning supporting ring is connected to the supporting plate and used for framing the bottom of the cylinder body so as to prevent the cylinder body from toppling over;

the transfer plate is provided with a bearing working position and a shifting-out working position, when the transfer plate is in the bearing working position, the transfer plate moves to the lower part of the rotary supporting ring, so that the rotation axis of the bearing plate coincides with the rotation axis of the rotary supporting ring, the bottom of the cylinder body can be supported on the bearing plate and rotate together with the bearing plate, the ring section cut by the cutting module can be vertically placed on the bearing plate, and when the transfer plate is in the shifting-out working position, the transfer plate moves away the bearing plate from the lower part of the rotary supporting ring, so that the ring section is separated from the cylinder body for lifting.

2. The reactor pressure vessel bowl ring cutting apparatus of claim 1, wherein: the upper surface of the transfer plate is provided with an annular steel ball groove for placing the bearing steel balls.

3. The reactor pressure vessel bowl ring cutting apparatus of claim 2, wherein: the upper surface of the transfer plate is also provided with a containing groove for containing the bearing plate to rotate, and the steel ball groove is formed in the bottom wall of the containing groove.

4. The reactor pressure vessel bowl ring cutting apparatus of claim 1, wherein: the top of first elevating leg with be equipped with pressure sensor between the fixed support ring, pressure sensor is used for detecting the barrel applys the pressure on the rotatory support ring, when pressure sensor's detected value is less than the setting value, drive assembly drive rotatory support ring rotates.

5. The reactor pressure vessel bowl ring cutting apparatus of claim 1, wherein: the driving assembly comprises a driving motor and a transmission unit, the driving motor is connected to the side wall of the fixed supporting ring, the transmission unit comprises a friction wheel arranged on an output shaft of the driving motor, and the outer wall of the friction wheel is attached to and abutted against the outer wall of the rotary supporting ring.

6. The reactor pressure vessel bowl ring cutting apparatus of claim 1, wherein: the positioning support ring is semicircular, the positioning support ring can be arranged in an opening and closing mode, and when the transfer plate is in a receiving working position, the positioning support ring is symmetrically distributed on two sides of the cylinder body.

7. The reactor pressure vessel bowl ring cutting apparatus of claim 6 wherein: the support plate is also provided with a hydraulic cylinder for driving the positioning support ring to open and close, and when the hydraulic cylinder drives the positioning support ring to close, the inner wall of the positioning support ring is rotationally connected with the inner wall of the cylinder body.

8. The reactor pressure vessel bowl ring cutting apparatus of claim 7, wherein: the positioning support ring comprises a ring body, a retainer connected with the ring body towards one side of the cylinder body, and a plurality of rolling bodies rotatably embedded on the retainer, wherein when the positioning support ring is folded, the rolling bodies are contacted with the outer wall of the cylinder body so as to facilitate the rotation of the cylinder body.

9. The reactor pressure vessel bowl ring cutting apparatus of claim 8, wherein: the positioning support ring further comprises an attaching ring rotatably arranged on the ring body through the rolling bodies, and when the positioning support ring is folded and the cylinder body rotates, the attaching ring follows the cylinder body to rotate, and moves from one positioning support ring to the other positioning support ring.

10. A reactor pressure vessel cylinder cutting method, characterized in that the cutting is performed by using the reactor pressure vessel cylinder cutting apparatus according to any one of claims 1 to 9, the cutting method comprising the steps of:

s1, extending a first lifting leg to the highest position, and moving a transfer plate to a receiving working position;

s2, hoisting the cylinder to be cut above the rotary support ring and falling the cylinder to enable the cylinder to be erected on the rotary support body, and enabling the positioning support ring to frame the bottom of the cylinder;

s3, retracting the first lifting leg to enable the lowest point of the cylinder to be supported on the bearing plate, so that the weight of the cylinder shared by the rotary supporting frames is not more than 90% of the dead weight of the cylinder;

s4, changing the extension length of the telescopic arm, and adjusting the circular saw blade to a set height; changing the extension length of the second lifting leg, and adjusting the positioning support ring to a set height;

s5, starting a cutting motor and a radial advancing motor, and utilizing the radial advancing motor to push the cutting motor and the circular saw blade to gradually advance towards the axial line direction of the cylinder until the depth of the circular saw blade extending into the cylinder is larger than the wall thickness of the cylinder at the position;

s6, driving the rotary supporting ring to rotate through the driving assembly, so that the cylinder body rotates around the axis of the cylinder body to realize ring cutting;

s7, after the circular cutting is completed, the cutting motor is turned off, and the cutting motor and the circular saw blade are driven to return to the original position by the radial moving motor;

s8, lifting the first lifting leg to separate the cylinder body from the cut ring section;

s9, moving the transfer plate to a working position so as to hoist the cut ring segments;

s10, repeating the steps S1-S10, and carrying out subsequent circular cutting.

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