CN114273716A - Cutting device for reactor pressure vessel - Google Patents
Cutting device for reactor pressure vessel Download PDFInfo
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- CN114273716A CN114273716A CN202111469872.9A CN202111469872A CN114273716A CN 114273716 A CN114273716 A CN 114273716A CN 202111469872 A CN202111469872 A CN 202111469872A CN 114273716 A CN114273716 A CN 114273716A
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Abstract
The invention discloses a cutting device of a reactor pressure vessel, which comprises a base, a cutting assembly, a push head assembly arranged on the base, a circumferential rotating mechanism and a radial moving mechanism, wherein the push head assembly is used for extending outwards to fix the cutting device in the reactor pressure vessel; the radial moving mechanism comprises a radial track arranged on the rotating support, a radial sliding seat fixed with the cutting assembly and a second driving assembly used for driving the radial sliding seat to move along the radial track.
Description
Technical Field
The invention relates to the technical field of cutting devices of nuclear facilities, in particular to a mechanical cutting device of a reactor pressure vessel.
Background
At present, China is vigorously developing nuclear power industry, 51 nuclear reactors are normally operated in China, and 11 nuclear reactor building units are built. The service life of the nuclear power station is 40-60 years generally, and the nuclear power station is subjected to retirement work such as cutting, dismantling and servicing according to relevant national regulations after the operation is over. The decommissioning of a nuclear power station is a long-term complex system engineering, and the decommissioning related technology and engineering preparation work should be carried out 10 years before the service end period of the power station. At present, the power station with the longest domestic running time is a Qin mountain nuclear power station, and the accumulated running lasts for more than 30 years. The domestic nuclear power industry needs to develop retirement related technologies as soon as possible so as to meet the needs of nuclear power retirement projects in the future.
In nuclear power plant decommissioning projects, large metal equipment needs to be cut and prepared to reduce space occupancy and achieve the goal of reducing waste disposal volume, and cutting large nuclear island main equipment is one of the most complex and difficult technologies and projects. At present, no system is developed for researching the cutting technology of the main equipment of the large-scale nuclear island in China.
Taking a reactor pressure vessel as an example, the following difficulties exist in cutting:
(1) the equipment has large volume and thickness. For example, the pressure container is cylindrical, the height is 13 meters, the diameter is close to 5 meters, the thickness of the main body reaches 170mm, the maximum thickness of the flange reaches 850mm, the overall weight reaches 65 tons, and the cutting workload is large;
(2) the equipment is in service for a long time, and the radioactive radiation dose is high after neutron activation; the pressure container directly contains the fuel cladding, the fuel cladding is irradiated by neutrons for a long time and is contacted with a high-radioactivity coolant for a long time, the dosage of a surface active layer is ultrahigh, and personnel generally cannot directly approach the fuel cladding;
(3) the equipment is fixed on a concrete foundation, and is difficult to disassemble and transport; for example, the pressure container is integrally fixed in a nuclear island pit, the gap between the bottom and the surrounding concrete is small, and personnel can only approach from the top and cannot manually carry out cutting work.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide an automated mechanical cutting apparatus for cutting a reactor pressure vessel in a circular manner.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cutting device of a reactor pressure vessel comprises a base, a cutting assembly, a push head assembly arranged on the base, a circumferential rotating mechanism and a radial moving mechanism, wherein the push head assembly is used for extending outwards to fix the cutting device in the reactor pressure vessel, and the circumferential rotating mechanism comprises an annular track, a supporting slide block arranged on the annular track in a sliding mode, a rotating support fixed with the supporting slide block and a first driving assembly used for driving the rotating support and the supporting slide block to move along the annular track; the radial moving mechanism comprises a radial track arranged on the rotating support, a radial sliding seat fixed with the cutting assembly and a second driving assembly used for driving the radial sliding seat to move along the radial track.
According to some preferred embodiments of the present invention, the first driving assembly includes an annular rack, a first driving motor, and a gear disposed on a driving shaft of the first driving motor, the gear is engaged with the annular rack, the first driving motor is fixedly connected to the rotary support, and the annular rack is fixed to the base. The annular gear rail is fixed, and through first driving motor drive gear rotation, and first driving motor is fixed with the rotating support for the rotating support rotates, and through the support slider on annular track and the rotating support, leads to and is spacing to the rotation of rotating support.
According to some preferred aspects of the invention, the second drive assembly comprises a drive, which is fixed to the rotary support and whose piston rod is fixedly connected to the radial slide. Remove along the radial track on the rotatory support through the radial slide of driver drive, and then make radial slide drive cutting assembly stretch out and draw back, realize running through the cutting.
According to some preferred aspects of the invention, the cutting assembly comprises a radial arm fixed to the radial slide, a saw blade fixed to an end of the radial arm, and a second drive motor for driving the saw blade to operate. The radial arm is fixedly arranged on the radial sliding seat so as to drive the saw blade to move through the movement of the radial sliding seat. The length of the radial arm is equivalent to the radius of the base, so that the saw blade is close to the reactor pressure vessel through the radial arm, and the saw blade can penetrate through the wall thickness of the reactor pressure vessel when the radial sliding seat moves.
According to some preferred implementation aspects of the invention, the base comprises an outer ring, an inner ring and a support cylinder for connecting the outer ring and the inner ring, the support cylinder is arranged between the outer ring and the inner ring at regular intervals, and the push head assembly is arranged in the support cylinder. The outer ring and/or the inner ring are circular or polygonal.
According to some preferred aspects of the invention, the thrust collar assembly includes a thrust collar and a third drive assembly for driving the thrust collar to telescope, the thrust collar extending outwardly through the outer collar. The third driving assembly drives the thrust head to stretch and retract, and the multiple groups of pushing assemblies synchronously act to fix the cutting device on the inner wall of the reactor pressure vessel or take the cutting device off the inner wall of the reactor pressure vessel.
According to some preferred aspects of the invention, a first support plate is provided on the base, and the endless track is provided on the first support plate.
According to some preferred aspect of the present invention, a second support plate is provided on the base, and the endless rack is provided on the second support plate.
According to some preferred implementation aspects of the invention, the inner ring and the outer ring are provided with support bars, and each support bar is provided with the first support plate and the second support plate. The even interval of support bar sets up on inner circle and outer lane, and sets up in turn with a support section of thick bamboo, is provided with a support bar between two adjacent support sections of thick bamboo promptly, not only can strengthen the structural strength of base, and still be provided with first backup pad and second backup pad on the support bar, and the circular orbit sets up in first backup pad, and the setting of annular cogged rail is in the second backup pad to promote the height of circular orbit and annular cogged rail.
According to some preferred embodiments of the present invention, at least two supporting sliders are disposed on the circular track, and two end portions of the rotating support are respectively fixed to the two supporting sliders. The support slider sets up for the arc, and the block is on circular orbit to the rotation of rotatory support is led and is spacing, makes the rotation of rotatory support more steady, prevents breaking away from of rotatory support.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the beneficial effects that: the cutting device for the reactor pressure vessel is stable in overall structure, the radial moving mechanism drives the cutting assembly to stretch and retract so as to drive the cutting assembly to penetrate through the wall thickness direction of the reactor pressure vessel, meanwhile, the annular rotating mechanism is used for driving the cutting assembly to rotate so as to cut the reactor pressure vessel annularly, and the problem of cutting of metal equipment such as the reactor pressure vessel is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a cutting device for a reactor pressure vessel according to a preferred embodiment of the present invention;
FIG. 2 is a perspective view of a first perspective of a cutting apparatus for a reactor pressure vessel in accordance with a preferred embodiment of the present invention;
FIG. 3 is a perspective view of a second perspective of a cutting apparatus for a reactor pressure vessel in accordance with a preferred embodiment of the present invention;
in the drawing, a reactor pressure vessel-1, an outer ring-21, an inner ring-22, a support cylinder-23, an annular track-31, a support slide-32, a rotary support-33, an annular gear track-34, a gear-35, a first drive motor-36, a radial track-41, a radial slide-42, a driver-43, a saw blade-51, a second drive motor-52, a radial arm-53, a thrust head-6, a first support plate-71, a second support plate-72, a support bar-73 and a cutting device-8.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the cutting device 8 of the reactor pressure vessel in the present embodiment includes a base, a cutting assembly, a pushing head assembly disposed on the base, and a hoop rotating mechanism and a radial moving mechanism. The pusher head assembly is adapted to extend outwardly to secure the cutting device 8 within the reactor pressure vessel 1. The base is the annular setting, and the even interval distribution of pusher subassembly is on the base to it is even to realize the atress, conveniently fixes cutting device 8 in reactor pressure vessel 1.
The base is used as a support piece of the whole cutting machine and comprises an outer ring 21, an inner ring 22 and a support cylinder 23 used for connecting the outer ring 21 and the inner ring 22, the support cylinder 23 is arranged between the outer ring 21 and the inner ring 22 at uniform intervals, and the push head assembly is arranged in the support cylinder 23. The outer ring 21 and the inner ring 22 are circular or polygonal. The support cylinder 23 stabilizes the base structure.
In order to further enhance the overall strength of the cutting device 8, the inner ring 22 and the outer ring 21 are provided with support bars 73 in this embodiment. The supporting strips 73 are uniformly arranged on the inner ring 22 and the outer ring 21 at intervals and are arranged alternately with the supporting cylinders 23, that is, one supporting strip 73 is arranged between two adjacent supporting cylinders 23 to strengthen the structural strength of the base.
The annular rotating mechanism comprises an annular track 31, a supporting slide block 32 arranged on the annular track 31 in a sliding mode, a rotating support 33 fixed with the supporting slide block 32, and a first driving assembly used for driving the rotating support 33 and the supporting slide block 32 to move along the annular track 31. Each support bar 73 is further provided with a first support plate 71 and a second support plate 72, the ring-shaped rail 31 is arranged on the first support plate 71, and the ring-shaped rack 34 is arranged on the second support plate 72 to raise the height of the ring-shaped rail 31 and the ring-shaped rack 34, so that the ring-shaped rack 34 and the ring-shaped rail 31 are fixed with the base.
The first driving assembly comprises an annular rack 34, a first driving motor 36 and a gear 35 arranged on a driving shaft of the first driving motor 36, the gear 35 is meshed with the annular rack 34, the first driving motor 36 is fixedly connected with the rotating support 33, and the annular rack 34 is fixed on the base. The annular gear rail 34 is fixed and the gear 35 is driven to rotate by the first driving motor 36, and the first driving motor 36 is fixed with the rotating support 33, so that the rotating support 33 rotates, and the rotation of the rotating support 33 is guided and limited by the annular rail 31 and the supporting slide block 32 on the rotating support 33.
In this embodiment, the annular track 31 is provided with two sets of four supporting sliders 32, and two supporting sliders 32 are fixed to two ends of the rotating support 33. The support slider 32 is the arc setting, and the block is on circular orbit 31 to the rotation of rotatory support 33 leads and spacing, makes the rotation of rotatory support 33 more steady, prevents breaking away from of rotatory support 33.
The radial movement mechanism comprises a radial track 41 provided on the rotary support 33, a radial slide 42 fixed to the cutting assembly and a second drive assembly for driving the radial slide 42 to move along the radial track 41. The second drive assembly comprises a drive 43, the drive 43 being fixed to the rotary support 33, the piston rod of the drive 43 being fixedly connected to the radial slide 42. The radial sliding base 42 is driven by the driver 43 to move along the radial track 41 on the rotating support 33, so that the radial sliding base 42 drives the cutting assembly to extend and retract, and through cutting is realized. The rotary support 33 in this embodiment is symmetrically provided with two radial tracks 41 and two drivers 43 corresponding to the two radial tracks 41 to achieve smooth movement of the radial slide 42.
The cutting assembly includes a radial arm 53 fixed to the radial slide 42, a saw blade 51 fixed to an end of the radial arm 53, and a second driving motor 52 for driving the saw blade 51 to operate. The radial arm 53 is fixedly arranged on the radial slide 42 to move the saw blade 51 by the movement of the radial slide 42. The length of the radial arms 53 corresponds to the radius of the base, so that the saw blades 51 are brought close to the reactor pressure vessel 1 by the radial arms 53 and the saw blades 51 can penetrate the wall thickness of the reactor pressure vessel 1 when the radial slides 42 are moved. The radial arm 53 is fastened to the radial slide 42 and receives a reverse thrust of the circular saw blade 51 during the cutting operation.
The thrust collar assembly comprises a thrust collar 6 and a third drive assembly for driving the thrust collar 6 to telescope, the thrust collar 6 extending outwardly through the outer race 21. The third driving assembly drives the thrust head 6 to stretch and retract, and the multiple groups of pushing assemblies act synchronously to fix the cutting device 8 on the inner wall of the reactor pressure vessel 1 or take the cutting device down from the inner wall of the reactor pressure vessel 1. The third drive assembly may employ a hydraulic cylinder. The push head assembly preferably uses 8 or 6 groups. The third driving assembly pushes the thrust collar 6 outwards to apply pressure on the inner wall of the pressure vessel 1, and the inner wall of the pressure vessel 1 is propped against the third driving assembly, so that the cutting device 8 and the pressure vessel 1 form stable connection.
The base is the annular setting, and the even interval distribution of pusher subassembly is on the base to it is even to realize the atress, conveniently fixes cutting device 8 in reactor pressure vessel 1. Radial movement mechanism is used for driving cutting assembly and stretches out and draws back to drive cutting assembly and cut through reactor pressure vessel 1's wall thickness direction, simultaneously, the hoop slewing mechanism is used for driving cutting assembly and rotates, in order to cut off reactor pressure vessel 1 annular, cuts apart into one section in order to carry out follow-up segmentation. Wherein, the annular rotating mechanism enables the rotating support 33 to rotate along the annular track 31 by arranging the annular track 31 and the first driving component.
The operation of the cutting device 8 of the reactor pressure vessel 1 in this embodiment is briefly described as follows:
the reactor pressure vessel 1 consists of an upper end enclosure, a cylinder body and a lower end enclosure, wherein the end enclosure is connected with the cylinder body by bolts. The upper closure head of the pressure vessel 1 needs to be removed before cutting can take place. The cutting device 8 is hung into the pressure vessel 1 by using the self-traveling crane of the nuclear power station, the pusher assembly is started, the third driving assembly drives the pusher 6 to extend out to be tightly combined with the inner wall of the pressure vessel 1, the weight of the whole cutting device is supported by using friction force, and then the traveling crane is removed.
The actuator 43 of the second drive assembly is activated to adjust the radial arm 53 to move forward until the saw blade 51 contacts the inner wall of the reactor pressure vessel 1.
The second driving motor 52 is started, and the driver 43 of the second driving assembly maintains a certain output torque, so that a certain interaction force exists between the saw blade 51 and the inner wall of the pressure vessel 1, the saw blade 51 starts to rotate, the metal of the inner wall of the pressure vessel 1 is cut, and the radial arm 53 drives the saw blade 51 to move forwards until the cylinder of the pressure vessel 1 is cut through.
The first driving motor 36 is started, and the rotating support 33 starts to rotate under the drive of the gear 35 and the annular rack 34, so that the rotating speed is controlled to be in a low speed state (rotating by 1 degree every 20 seconds). The rotary support 33 rotates 360 degrees, and then the cylinder body of the pressure container 1 can be cut on the annular direction.
And then, hoisting the cutting section away by using the crane of the nuclear power station site. After the preset annular cutting is finished, the cutting device can be hung by using the crane, and then the cutting device is conveyed to the next preset position to continue the annular cutting of the next section. The annular cylinder section that cuts down can utilize other cutting means to continue to cut into smaller segment to reduce solid useless volume, save the retirement and deal with the cost.
Compared with the prior art, the invention has the following advantages: the cutting problem of the oversized metal equipment, namely the reactor pressure vessel, is solved; the base of the cutting device adopts an annular structural design, so that the structure is stable; the multiple groups of hydraulic heads simultaneously act on the inner wall of the reactor pressure vessel, so that the binding force is strong; the remote automatic annular cutting of the reactor pressure vessel is realized, the start and stop of all hydraulic mechanisms and motors are remotely controlled by personnel, and the minimization of the dosage of the personnel is realized; compared with thermal cutting (flame cutting, plasma cutting and other processes), the mechanical device cutting has less secondary pollutant generation amount; the cutting can be carried out in the air, or the pressure container can be filled with water, and the cutting machine can be completely immersed in the water to carry out cutting. The underwater cutting can further reduce the risk of air pollution, a small amount of waste residues generated by cutting are completely reserved in water, and the waste residues can be cleaned by filtering the water.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The cutting device for the reactor pressure vessel is characterized by comprising a base, a cutting assembly, a push head assembly, a circumferential rotating mechanism and a radial moving mechanism, wherein the push head assembly is arranged on the base and used for extending outwards to fix the cutting device in the reactor pressure vessel; the radial moving mechanism comprises a radial track arranged on the rotating support, a radial sliding seat fixed with the cutting assembly and a second driving assembly used for driving the radial sliding seat to move along the radial track.
2. The cutting device of claim 1, wherein the first driving assembly comprises an annular rack, a first driving motor, and a gear disposed on a driving shaft of the first driving motor, the gear is engaged with the annular rack, the first driving motor is fixedly connected to the rotary support, and the annular rack is fixed to the base.
3. The cutting device according to claim 1, characterized in that said second drive assembly comprises a driver fixed on said rotary support, a piston rod of said driver being fixedly connected with said radial slide.
4. The cutting device of claim 1, wherein the cutting assembly includes a radial arm secured to the radial slide, and a saw blade secured to an end of the radial arm and a second drive motor for driving the saw blade in operation.
5. The cutting device according to claim 1, wherein the base comprises an outer ring, an inner ring and a support cylinder for connecting the outer ring and the inner ring, the support cylinder is arranged between the outer ring and the inner ring at regular intervals, and the push head assembly is arranged in the support cylinder.
6. The cutting apparatus of claim 5, wherein the thrust head assembly includes a thrust head and a third drive assembly for driving the thrust head to telescope, the thrust head extending outwardly through the outer race.
7. The cutting device of claim 5, wherein the base is provided with a first support plate, and the endless track is provided on the first support plate.
8. The cutting device of claim 7, wherein a second support plate is provided on the base, the annular rack being provided on the second support plate.
9. The cutting device as claimed in claim 8, wherein support bars are provided on the inner and outer rings, each support bar having the first and second support plates provided thereon.
10. The cutting device according to any one of claims 1 to 9, wherein at least two support sliders are provided on the endless track, and both end portions of the rotary support are fixed to the two support sliders, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469872.9A CN114273716A (en) | 2021-12-03 | 2021-12-03 | Cutting device for reactor pressure vessel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469872.9A CN114273716A (en) | 2021-12-03 | 2021-12-03 | Cutting device for reactor pressure vessel |
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| CN114273716A true CN114273716A (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111469872.9A Pending CN114273716A (en) | 2021-12-03 | 2021-12-03 | Cutting device for reactor pressure vessel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682815A (en) * | 2022-04-24 | 2022-07-01 | 苏州市华盛源机电有限公司 | Large hollow cylinder casing end cover hole drilling system and drilling method |
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| CN102509566A (en) * | 2011-10-17 | 2012-06-20 | 中广核检测技术有限公司 | Nuclear rector pressure vessel nozzle safe end welding joint automatic ray inspection device |
| CN103357928A (en) * | 2013-06-27 | 2013-10-23 | 中广核工程有限公司 | Method for repairing main screw hole of reactor pressure vessel |
| CN204122846U (en) * | 2014-08-29 | 2015-01-28 | 杜德术 | AP1000 nuclear power station main pump Canopy device for sealed-cutting |
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| CN114682815A (en) * | 2022-04-24 | 2022-07-01 | 苏州市华盛源机电有限公司 | Large hollow cylinder casing end cover hole drilling system and drilling method |
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