CN211465909U - Large-scale shielding main pump lower part C ring cutting device - Google Patents
Large-scale shielding main pump lower part C ring cutting device Download PDFInfo
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- CN211465909U CN211465909U CN201922357116.1U CN201922357116U CN211465909U CN 211465909 U CN211465909 U CN 211465909U CN 201922357116 U CN201922357116 U CN 201922357116U CN 211465909 U CN211465909 U CN 211465909U
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Abstract
A C-ring cutting device at the lower part of a large shielding main pump belongs to the technical field of maintenance of large shielding main pumps of nuclear power stations. The device comprises a base, a movable ring, a motor and a tool rest; the base is used for being fixed at the bottom of a stator end cover below the shielding main pump, and the movable ring is installed on the base through a roller bearing so as to rotate relative to the base; a knife arm is arranged on the side surface of the movable ring, and the knife rest is arranged on the knife arm; the motor is arranged on the movable ring and is in transmission connection with the movable ring, and the tool rest rotates along with the movable ring to cut the C ring in the radial direction. The utility model discloses simple structure, easy operation reduces maintenance personal's radiation protection risk, improves maintenance precision and quality.
Description
Technical Field
The utility model belongs to the technical field of the large-scale shielding main pump maintenance of nuclear power station, concretely relates to large-scale shielding main pump lower part C encircles wire cut electrical discharge machining device for large-scale shielding main pump overhauls on line, can support and realize that large-scale shielding main pump lower part end cover dismantles, lower part locking cup changes etc. overhauls the technology on line.
Background
After a nuclear power station runs for a long time, the possibility that problems occur in lower important parts such as a locking cup of a shielding type reactor coolant pump (hereinafter referred to as a shielding main pump) is increased gradually, and it is necessary to plan and develop a large shielding main pump online maintenance process in a radioactive environment in advance. The pump casing of the shielding main pump is welded on the bottom head of the steam generator, the shielding main pump is inversely arranged on the pump casing through 24 main bolts, the lower locking cup, the lower thrust bearing and other parts of the shielding main pump are positioned below the shielding main pump, and the lower stator end cover is arranged below the shielding main pump. If the thrust bearing at the lower part of the shielding main pump and the locking cup need to be overhauled, the shielding main pump overhauling process designed in the existing West House needs to firstly disassemble the shielding main pump, and the shielding main pump is detached from the pump shell to be transported and then disassembled for overhauling. The technical scheme does not relate to the on-line maintenance aspect of the shielding main pump, the whole disassembly engineering quantity of the shielding main pump is large, the early preparation work is complicated, the whole process is more, and the time of a key path is greatly increased. In order to realize the online maintenance and replacement of important parts at the lower part of the shielding main pump, an online maintenance process of the shielding main pump needs to be developed. The comprehensive analysis is carried out on the structure of the shielding main pump and the field conditions of the compartments, and the factors restricting the on-line maintenance process of the shielding main pump are mainly as follows:
1. because the upper thrust bearing assembly of the shielding main pump is in clearance fit with the motor shell, the upper thrust bearing assembly has the risk of falling integrally after the lower end cover is removed. Because lower thrust bearing assembly and motor casing fit clearance are less, in case the whereabouts condition appears in the lower thrust bearing assembly, because upper portion thrust bearing assembly sets up can be internal at the motor, can't ensure it and resume original position when repacking. Thus, it is ensured that the upper thrust bearing is not displaced during the disassembly of the lower stator end cover.
2. The shielding main pump rotor assembly and the upper thrust bearing assembly account for about 14.2 tons, when the lower thrust bearing is disassembled, a bearing tool needs to be considered to be arranged to support the rotor assembly and the upper thrust bearing assembly, and meanwhile, the load capacity of the bearing tool needs to meet the requirement.
3. Because the space of the on-site cavity is narrow and small, and the distance between the lower part of the shielding main pump and the ground is about 1.3 meters, the radiation safety and the maintenance efficiency of maintainers in a radioactive environment are seriously influenced. The factors all bring great difficulty to the on-line maintenance of the shielded main pump.
The invention patent application CN201910553646.5 discloses a cutting device for a C ring at the lower part of a large-scale shielding main pump of a nuclear power plant, and particularly discloses that the cutting device comprises a wall-hanging component and a cutting component; the wall hanging assembly comprises a pressing plate and a wall hanging main body; the pressure plate is used for being fixed on the end face of the lower end cover of the main pump, and a gap is reserved between the pressure plate and the lower end cover of the main pump, so that a tongue portion of the wall-hanging main body can slide in the gap; the cutting assembly comprises an angle grinder head, a transmission mechanism and a cutting mechanism; the lower part of the wall-mounted main body is connected with the angle grinder head, and the angle grinder head is connected with a cutting mechanism extending into the space where the main pump C ring is located through a transmission mechanism. The device adopts the hanging form to install at main pump bottom end cover.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, provide a large-scale shielding main pump lower part C ring on-line cutting device, easy operation reduces maintenance personal's radiation protection risk, improves and overhauls precision and quality.
The utility model discloses a can realize through following technical scheme:
the utility model relates to a large-scale shielding main pump lower part C ring cutting device, which comprises a base, a rotating ring, a motor and a tool rest; the base is used for being fixed at the bottom of a stator end cover below the shielding main pump, and the movable ring is installed on the base through a roller bearing so as to rotate relative to the base; a knife arm is arranged on the side surface of the movable ring, and the knife rest is arranged on the knife arm; the motor is arranged on the movable ring and is in transmission connection with the movable ring, and the tool rest rotates along with the movable ring to cut the C ring in the radial direction.
The cutting device is simple in structure, the device is fixed on the stator end cover, the motor is utilized to rotate to drive the rotating ring to rotate, and the tool rest follows the rotating ring to rotate, so that the C ring at the lower part of the shielding main pump is cut.
Preferably, the base is provided with a spigot for mounting the roller bearing.
Preferably, the roller bearing is internally and externally provided with a locking ring with a threaded hole.
Preferably, a cylindrical gear is mounted on the end face of the movable ring; the cylindrical gear is in transmission connection with the motor.
Preferably, a cross section is arranged on the side surface of the movable ring, and the knife arm is installed on the cross section.
Preferably, the knife arm comprises a radially extending arm and an axially extending arm; one end of the radial extension arm is connected with the side surface of the movable ring, and the other end of the radial extension arm extends outwards and is connected with the axial extension arm; the axially extending arm extends in a direction toward the shielded main pump.
Preferably, the tool rest is provided with a turning tool and a driving mechanism, and the driving mechanism controls the turning tool to cut in the radial direction.
Preferably, the device further comprises four support blocks; the base is fixed at the bottom of a stator end cover below the shielding main pump through a supporting block; the four supporting blocks are arranged at 90 degrees in the circumferential direction of the stator end cover.
Preferably, the base is a fixed disc.
The utility model discloses following beneficial effect has:
the utility model relates to a large-scale shielding main pump lower part C ring cutting device, which has simple structure and simple and convenient operation; the device solves the problems of installation and operation of the device under the condition of no hoisting equipment while ensuring the quality and the precision. Meanwhile, the time for overhauling a key path of the main pump is shortened, and the total radiation dose of maintenance personnel is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a lower C ring of a shield main pump mounted on the shield main pump;
fig. 2 is the structure diagram of the C-ring cutting device for the lower part of the large-sized shielding main pump, which is installed at the bottom of the stator end cover of the lower part of the shielding main pump.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Referring to fig. 2, the large shielded main pump lower C-ring cutting device comprises a base 4, a rotating ring 7, a motor 10 and a tool rest 5. The base 4 is used for being fixed at the bottom of a stator end cover C below the shielding main pump A, and the movable ring 7 is installed on the base 4 through the roller bearing 3, so that the movable ring can rotate relative to the base 4. The side surface of the movable ring 7 is provided with a knife arm 6, and the knife rest 5 is arranged on the knife arm 5. The motor 10 is arranged on the movable ring 7, the motor 10 is in transmission connection with the movable ring 7, and the tool rest 5 can rotate along with the movable ring 7 to radially cut the lower ring C (see fig. 1).
The base 4 is a fixed disc, can be directly fixed at the bottom of the stator end cover C, and can also be fixed at the bottom of the stator end cover through a supporting seat. The supporting seat can include four supporting blocks 1, and four supporting blocks are arranged at 90 degrees in the circumferential direction of the stator end cover. The supporting block is installed at the bottom of the stator end cover through a bolt.
In order to ensure the rotation precision, the roller bearing adopts a large-scale crossed roller bearing, a locking ring 2 is arranged inside and outside the roller bearing, and a threaded hole is drilled in the locking ring, so that other components can be conveniently connected. The fixed disc is arranged on the spigot and is used for installing the crossed roller bearing.
The rotating ring 7 is mounted on the surface of a roller bearing for rotation. Meanwhile, the side surface of the movable ring 7 is provided with a section for installing the knife arm 5. The end face of the movable ring is also provided with a cylindrical gear 8, the cylindrical gear is in transmission connection with the motor, and the cylindrical gear drives the movable ring and a cutter arm arranged on the movable ring to rotate through transmission with the motor gear.
The knife arm 5 comprises a radially extending arm 51 and an axially extending arm 52. One end of the radial extension arm 51 is connected with the side surface of the movable ring 7, and the other end is connected with an axial extension arm 52 in an outward extending way. The axially extending arm 52 extends in the direction of the canned main pump. When the cutter arm rotates, the cutter frame is driven to rotate, and radial cutting is realized. The tool rest is provided with a turning tool and a driving mechanism, and the driving mechanism controls the turning tool to cut radially. The driving mechanism can control the axial and radial feeding of the turning tool on the tool rest, such as belt transmission. The knife rest can adopt the cutting assembly in the prior application CN201910553646.5, and a belt transmission mode is used for controlling a grinding wheel to cut the lower C ring of the shield pump.
The motor 10 is a servo motor and is arranged on a motor base 9, the motor base is arranged on the inner side of the cutting device, namely on the locking ring 2 in the movable ring, and the rotation of the movable ring is not influenced by the arrangement of the motor base.
The C-ring cutting device at the lower part of the large shielding main pump carries out online maintenance: and (3) drilling a central hole at the stator end cover C by using a drilling tool, installing a supporting block, and fixing a cutting device (not according to a tool rest) at the bottom of the stator end cover. And then, a lower stator end cover auxiliary tool, such as four groups of jacks, is arranged at the lower central position of the lower end cover device, and the jacks are operated and lifted to jack up the lower stator end cover of the shielding main pump to bear force. And (4) removing the main bolts of the lower stator end cover by using the bolt heaters. And installing and shielding a tool rest of the online cutting device for the C ring at the lower part of the main pump and debugging the tool rest. And then starting a motor, and adjusting the radial feed amount of the tool rest in the rotation process to cut the lower C-shaped sealing ring. And after cutting, withdrawing the radial feeding amount of the tool rest, and turning off the motor.
The tool holder also needs to be adjusted before starting the motor. Specifically, a servo motor is started, and the rotating speed of the motor is adjusted to enable the tool rest to reach the set peripheral milling rotating speed. And closing the servo motor, then adjusting the radial direction and the axial direction of the tool rest to a preset position, wherein the turning tool does not contact the lower C-shaped sealing ring at the moment, and the milling mode is forward milling.
And after the cutting of the lower C-shaped sealing ring is confirmed to be finished, the lower stator end cover is moved downwards by using four groups of jacks and is stopped after being moved downwards to a certain space. And starting a motor, adjusting the axial feeding amount and the radial feeding amount of the tool rest, repairing the flange surface of the shielding main pump, and repairing and leveling the flange surface by using a plane tool. And after the repair is finished, the C-shaped ring on the lower part of the pump is subjected to online cutting, and the four groups of jacks are dismantled.
It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The purpose of the utility model is completely and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.
Claims (9)
1. A cutting device for a C ring at the lower part of a large shielding main pump is characterized by comprising a base, a movable ring, a motor and a tool rest; the base is used for being fixed at the bottom of a stator end cover below the shielding main pump, and the movable ring is installed on the base through a roller bearing so as to rotate relative to the base; a knife arm is arranged on the side surface of the movable ring, and the knife rest is arranged on the knife arm; the motor is arranged on the movable ring and is in transmission connection with the movable ring, and the tool rest can rotate along with the movable ring to radially cut the C ring.
2. The large shielded main pump lower C-ring cutting device according to claim 1, wherein the base is provided with a spigot for mounting the roller bearing.
3. The large shielded main pump lower C-ring cutting device according to claim 1, wherein the roller bearings are internally and externally provided with locking rings with threaded holes.
4. The large shielding main pump lower C-ring cutting device according to claim 1, characterized in that a cylindrical gear is mounted on the end face of the rotating ring; the cylindrical gear is in transmission connection with the motor.
5. The large shielding main pump lower C-ring cutting device according to claim 1, wherein the side surface of the rotating ring is provided with a section, and the cutter arm is installed at the section.
6. The large shielded main pump lower C-ring cutting device according to claim 1, wherein the cutter arm comprises a radially extending arm and an axially extending arm; one end of the radial extension arm is connected with the side surface of the movable ring, and the other end of the radial extension arm extends outwards and is connected with the axial extension arm; the axially extending arm extends in a direction toward the shielded main pump.
7. The large shielding main pump lower C-ring cutting device according to claim 6, wherein a turning tool and a driving mechanism are arranged on the tool rest, and the driving mechanism controls the turning tool to cut radially.
8. The large shielded main pump lower C-ring cutting device according to claim 1, further comprising four supporting blocks; the base is fixed at the bottom of a stator end cover below the shielding main pump through a supporting block; the four supporting blocks are arranged at 90 degrees in the circumferential direction of the stator end cover.
9. The large shielded main pump lower C-ring cutting device according to claim 1, wherein the base is a fixed disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922357116.1U CN211465909U (en) | 2019-12-25 | 2019-12-25 | Large-scale shielding main pump lower part C ring cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922357116.1U CN211465909U (en) | 2019-12-25 | 2019-12-25 | Large-scale shielding main pump lower part C ring cutting device |
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| CN211465909U true CN211465909U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922357116.1U Active CN211465909U (en) | 2019-12-25 | 2019-12-25 | Large-scale shielding main pump lower part C ring cutting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111438374A (en) * | 2020-04-15 | 2020-07-24 | 三门核电有限公司 | Shielding main pump case C type sealing ring back chipping device |
| CN112792404A (en) * | 2021-01-14 | 2021-05-14 | 中广核工程有限公司 | Nuclear power station reactor core bounding wall cutting device |
| CN114273716A (en) * | 2021-12-03 | 2022-04-05 | 苏州热工研究院有限公司 | Cutting device for reactor pressure vessel |
| CN114789343A (en) * | 2021-01-25 | 2022-07-26 | 国核电站运行服务技术有限公司 | A overhaul device that is used for nuclear power with shielding main pump Canopy incomplete ring |
-
2019
- 2019-12-25 CN CN201922357116.1U patent/CN211465909U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111438374A (en) * | 2020-04-15 | 2020-07-24 | 三门核电有限公司 | Shielding main pump case C type sealing ring back chipping device |
| CN111438374B (en) * | 2020-04-15 | 2021-07-23 | 三门核电有限公司 | Shielding main pump case C type sealing ring back chipping device |
| CN112792404A (en) * | 2021-01-14 | 2021-05-14 | 中广核工程有限公司 | Nuclear power station reactor core bounding wall cutting device |
| CN114789343A (en) * | 2021-01-25 | 2022-07-26 | 国核电站运行服务技术有限公司 | A overhaul device that is used for nuclear power with shielding main pump Canopy incomplete ring |
| CN114789343B (en) * | 2021-01-25 | 2024-02-27 | 国核电站运行服务技术有限公司 | A overhaul device that is used for nuclear power to use incomplete ring of shielding main pump Canopy |
| CN114273716A (en) * | 2021-12-03 | 2022-04-05 | 苏州热工研究院有限公司 | Cutting device for reactor pressure vessel |
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