CN211388602U - Auxiliary dismounting device for lower stator end cover of shielding main pump - Google Patents
Auxiliary dismounting device for lower stator end cover of shielding main pump Download PDFInfo
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- CN211388602U CN211388602U CN201922323416.8U CN201922323416U CN211388602U CN 211388602 U CN211388602 U CN 211388602U CN 201922323416 U CN201922323416 U CN 201922323416U CN 211388602 U CN211388602 U CN 211388602U
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- end cover
- main pump
- stator end
- lower stator
- shielding main
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- 238000012423 maintenance Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A device for assisting in disassembling and assembling a stator end cover at the lower part of a shielding main pump belongs to the technical field of maintenance of large shielding main pumps of nuclear power stations. The utility model comprises a plurality of screw rods, a plurality of nuts and a plurality of jacks; the screw rod penetrates through a through hole in the lower stator end cover and is connected with a threaded hole in the main pump body; the screw is connected below the lower stator end cover through the nut, and the jack is supported below the lower stator end cover. The utility model discloses simple structure, convenient to use can guarantee dismantling smoothly and on-the-spot safety of lower part stator end cover, supports and realizes shielding main pump lower part component's local disintegration and online maintenance.
Description
Technical Field
The utility model relates to a large-scale shielding main pump maintenance technical field of nuclear power station especially relates to a supplementary dismouting device of shielding main pump lower part stator end cover.
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 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 shielding main pump lower part thrust bearing, locking cup need overhaul, according to shielding main pump structural principle analysis, overhaul after dismantling the lower part stator end cover. And from the maintenance process of the shielding main pump designed in the current west-house, the shielding main pump must be integrally disassembled firstly, and the shielding main pump can be disassembled for maintenance after being separated from a pump shell for transportation. The technical scheme does not relate to the aspect of online dismounting of the lower stator end cover of the shielding main pump, the whole dismounting engineering quantity of the shielding main pump is large, the early-stage preparation work is complicated, the whole process is more, and the time of a key path is greatly prolonged. In order to realize the online maintenance and replacement of important parts at the lower part of the shielding main pump, an auxiliary dismounting device and an operation process for a stator end cover at the lower part of the shielding main pump need to be developed to carry out the online maintenance of the shielding main pump. The factors that comprehensively analyze the structure of the shielding main pump and the field conditions of the compartments and restrict the dismounting and mounting process of the lower stator end cover are mainly as follows:
1. because the stator end cover at the lower part of the shielding main pump is arranged in an inverted mode, the inner lower tile and the shaft sleeve are axially positioned. Therefore, after the main bolt at the lower part of the shielding main pump and the lower C-shaped ring are detached and cut, theoretically, the lower stator end cover, the lower tile and the shaft sleeve can fall down due to self gravity, and residual media are still arranged inside the lower stator end cover, the lower tile and the shaft sleeve. The risk of damaging equipment and being unfavorable for the work safety of maintainers is greatly increased, so in the process of removing and falling the lower stator end cover, the field control is needed.
2. Due to the inclined angle of the evaporator arrangement, the shielded main pump suspended below the evaporator bottom head is not completely in a vertical state. The assembly and disassembly of components such as the lower end cover of the shielding main pump, the thrust bearing assembly, the thrust bearing spacer bush and the like are greatly difficult. If the solution measures are improper, the major risk of component disassembly and assembly and blocking can be caused. Therefore, an auxiliary device is needed to guide and ensure that the horizontal and axial directions of the lower stator end cover are fixed in the falling process.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that above-mentioned prior art exists, provide a dismouting device is assisted to shielding main pump lower part stator end cover, it can guarantee demolising smoothly and on-the-spot safety of lower part stator end cover, supports and realizes shielding main pump lower part component's local disintegration and online maintenance.
The utility model aims at realizing through the following technical scheme:
an auxiliary dismounting device for a stator end cover at the lower part of a shielding main pump comprises a plurality of screw rods, a plurality of nuts and a plurality of jacks; the screw rod penetrates through a through hole in the lower stator end cover and is connected with a threaded hole in the main pump body; the nut is connected with the screw rod below the lower stator end cover, and the jack is supported below the lower stator end cover.
The use principle is as follows: a main bolt hole at the lower part of the main pump body is utilized to install a plurality of groups of screw rods and nuts, and the weight of the stator end cover at the lower part is supported through the nuts. In the falling operation process of the lower stator end cover, the device is adjusted horizontally according to the distance from the lower stator end cover to the end face of the lower flange of the main pump body, and stroke control is performed by using the screw and the nut, so that the lower stator end cover is prevented from being jammed with the pump body, and the lower stator end cover falls horizontally smoothly, and the lower stator end cover, the lower thrust bearing assembly and the thrust bearing bush are smoothly dismounted. And a plurality of jacks are used for assisting in lifting the lower stator end cover, so that the lower stator end cover can be conveniently reloaded and the lower C-shaped ring in the maintenance process can be conveniently cut and repaired, and attention needs to be paid to the process to avoid the jacks from interfering with the pump shaft supporting device.
The utility model preferably further comprises a guide plate and a guide rod, wherein the guide plate is provided with a fixing hole and a guide hole, and the guide plate is fixedly connected with a through hole of the lower stator end cover through the fixing hole and the expansion bolt; one end of the guide rod is fixed in a lifting lug mounting hole on the main pump body, and the other end of the guide rod penetrates through the guide hole. The structure is used for accurately guiding the falling process of the lower stator end cover so as to improve the fluency of the falling process.
Preferably, the guide plate and the guide rod are provided with two groups, and are respectively arranged at the opposite sides of the main pump body. The structure has higher guiding stability.
Preferably, the screw rods are provided with 4 evenly distributed screws. On the premise of ensuring the support stability, the material is saved, and the operation efficiency is improved.
Preferably, the jack has 4 jacks uniformly distributed. On the premise of ensuring the support stability, the material is saved, and the operation efficiency is improved.
The utility model has the advantages that: simple structure, convenient to use can guarantee demolising smoothly and on-the-spot safety of lower part stator end cover, supports and realizes shielding main pump lower part component's local disintegration and on-line maintenance.
Drawings
Fig. 1 is a schematic structural diagram of the usage state of the present invention.
1-a screw; 2-a nut; 3-a jack; 4-a guide plate; 5-a guide rod; 6-lower stator end cover; 7-a main pump body; 8-expansion bolt.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
An auxiliary dismounting device for a stator end cover at the lower part of a shielding main pump comprises four screw rods 1, four nuts 2, four jacks 3, two guide plates 4 and two guide rods 5; the screw rod 1 penetrates through a through hole in the lower stator end cover 6 and is connected with a threaded hole in the main pump body 7; the nut 2 is connected with the screw rod 1 below the lower stator end cover 6, and the jack 3 is supported below the lower stator end cover 6. The guide plate 4 is provided with a fixing hole and a guide hole, and the guide plate 4 is fixedly connected with a through hole of the lower stator end cover 6 through the fixing hole and the expansion bolt 8; one end of the guide rod 5 is fixed on a lifting lug mounting hole on the main pump body 7, and the other end of the guide rod penetrates through the guide hole. Two groups of guide plates 4 and guide rods 5 are respectively arranged on the opposite sides of the main pump body 7, 4 screw rods 1 are uniformly distributed on the flange surface of the main pump body 7, and 4 jacks 3 are uniformly distributed below the lower stator end cover 6.
According to the shielding main pump online process, the implementation preconditions are as follows:
1. drilling a center hole of a lower stator end cover;
2. mounting a rotor supporting device;
3. removing all the main bolts of the lower stator end cover;
4. cutting the lower C-shaped ring;
5. pre-lifting the four groups of jacks to the right position;
6. installing a guide plate and a guide rod;
7. four groups of screw rods and nuts are installed;
8. adjusting four groups of screw nuts to enable the screw nuts to be stressed uniformly;
when the lower stator end cover falls: in the operation process, the device level is continuously adjusted according to the distance from the lower stator end cover to the end face of the lower flange of the shielding main pump, and the lower end cover and the pump body are prevented from being jammed by using a screw and a nut as stroke control; smoothly and horizontally dropping the lower stator end cover to finish the smooth removal of the lower stator end cover, the lower thrust bearing assembly and the thrust bearing bush;
when the device is reloaded: and jacking the lower stator end cover by using a mechanical jack until the lower stator end cover is connected with the four screw rods, and jacking the lower stator end cover in place along the guide rods.
The above description is only the specific embodiment of the preferred embodiment of the present invention, and this specific embodiment is based on the present invention, and the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. An auxiliary dismounting device for a stator end cover at the lower part of a shielding main pump is characterized by comprising a plurality of screw rods, a plurality of nuts and a plurality of jacks; the screw rod penetrates through a through hole in the lower stator end cover and is connected with a threaded hole in the main pump body; the nut is connected with the screw rod below the lower stator end cover, and the jack is supported below the lower stator end cover.
2. The auxiliary dismounting device for the shielding main pump lower stator end cover according to claim 1, further comprising a guide plate and a guide rod, wherein the guide plate is provided with a fixing hole and a guide hole, and the guide plate is fixedly connected to the through hole of the lower stator end cover through the fixing hole and the expansion bolt; one end of the guide rod is fixed in a lifting lug mounting hole on the main pump body, and the other end of the guide rod penetrates through the guide hole.
3. The apparatus of claim 2, wherein the guide plates and guide rods are provided in two sets, one set being located on each side of the main pump body.
4. The auxiliary dismounting device for the end cover of the lower stator of the shielding main pump according to claim 1, wherein the number of the screw rods is 4.
5. The auxiliary dismounting device for the end cover of the lower stator of the shielding main pump according to claim 1, wherein the jacks are uniformly distributed in 4 numbers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922323416.8U CN211388602U (en) | 2019-12-23 | 2019-12-23 | Auxiliary dismounting device for lower stator end cover of shielding main pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922323416.8U CN211388602U (en) | 2019-12-23 | 2019-12-23 | Auxiliary dismounting device for lower stator end cover of shielding main pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211388602U true CN211388602U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922323416.8U Active CN211388602U (en) | 2019-12-23 | 2019-12-23 | Auxiliary dismounting device for lower stator end cover of shielding main pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211388602U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478431A (en) * | 2021-07-22 | 2021-10-08 | 哈尔滨电气动力装备有限公司 | Large-scale shielding motor thrust disc nut mounting and locking process |
| CN117680966A (en) * | 2023-12-21 | 2024-03-12 | 河南中原特钢装备制造有限公司 | A method for replacing the guide sleeve of a large press forging hydraulic cylinder |
-
2019
- 2019-12-23 CN CN201922323416.8U patent/CN211388602U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113478431A (en) * | 2021-07-22 | 2021-10-08 | 哈尔滨电气动力装备有限公司 | Large-scale shielding motor thrust disc nut mounting and locking process |
| CN113478431B (en) * | 2021-07-22 | 2022-10-11 | 哈尔滨电气动力装备有限公司 | Large-scale shielding motor thrust disc nut mounting and locking process |
| CN117680966A (en) * | 2023-12-21 | 2024-03-12 | 河南中原特钢装备制造有限公司 | A method for replacing the guide sleeve of a large press forging hydraulic cylinder |
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