CN215208001U - Lifting appliance for main bolt of nuclear reactor pressure vessel - Google Patents
Lifting appliance for main bolt of nuclear reactor pressure vessel Download PDFInfo
- Publication number
- CN215208001U CN215208001U CN202023262577.XU CN202023262577U CN215208001U CN 215208001 U CN215208001 U CN 215208001U CN 202023262577 U CN202023262577 U CN 202023262577U CN 215208001 U CN215208001 U CN 215208001U
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- sleeve
- pressure vessel
- nuclear reactor
- reactor pressure
- main bolt
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Abstract
The utility model belongs to the nuclear power station overhauls the technique, concretely relates to nuclear reactor pressure vessel kingbolt hoist. The lifting appliance comprises a sleeve and a lifting mechanism, wherein the upper end of the sleeve can move up and down relative to the sleeve, a pressing plate is fixedly arranged at the lower end of the lifting mechanism, the area of the pressing plate is larger than the mounting hole of the lifting mechanism, a through hole is processed in the side wall of the sleeve, a connecting key is mounted in the through hole, and the through hole is welded and fixed. The main bolt hoisting hanger realizes the main bolt hoisting in the state of installing the adapter, so that the whole switch cover operates each main bolt to dismount and mount the main bolt hoisting hanger for 2 times respectively, and the adapters are dismounted and mounted for 1 time respectively, the process is simplified, and the operability is improved.
Description
Technical Field
The utility model belongs to the nuclear power station overhauls the technique, concretely relates to nuclear reactor pressure vessel kingbolt hoist.
Background
A certain nuclear power plant adopts four large-scale nuclear power units, 54 bolt holes are arranged outside a main sealing surface of a nuclear reactor pressure vessel, and 54 through holes are arranged on a top cover. The pressure vessel and the top cover are sealed through a main sealing element (comprising 54 main bolts, 54 main nuts, 54 sets of concave-convex ball gaskets and 2 nickel gaskets).
The nuclear power unit usually adopts 12 months or 18 months as a fuel cycle, partial nuclear fuel must be replaced after each fuel cycle is finished, and the following operations are required: open the reactor pressure vessel (i.e., open lid operation) → refueling → close the pressure vessel (i.e., close lid operation). The whole cover opening and closing operation relates to the maintenance work of the main sealing element, and comprises the following steps: the method comprises the steps of stretching and unscrewing a main bolt, dismantling, locally disassembling, cleaning, checking, thread lubricating, assembling, reinstalling and stretching and pre-tightening the main bolt. The main bolt has a mass of 306Kg, M42 hoisting threads are arranged at the top of the main bolt for hoisting, and meanwhile, a manufacturer is matched with a special hoisting tool. In order to improve the working quality and efficiency, a special tool, namely a main bolt stretcher, is usually used for opening and closing the cover of the nuclear reactor pressure vessel. In order to realize the rotation and lifting operation of the manipulator to the main bolt and meet the measurement requirement of the elongation of the main bolt, an adapter must be installed at the position of a hoisting hole of each main bolt.
The existing main bolt lifting appliance can only be directly connected with the main bolt, the lifting of the main bolt in the adapter mounting state cannot be considered, and the applicability is not strong; the existing main bolt hoisting process is complicated and fussy, and the investment of manpower, material resources and financial resources is large, so that unnecessary dose irradiation and radioactive wastes are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a nuclear reactor pressure vessel kingbolt hoist can simplify the hoist and mount technology greatly, can adapt to the condition of installation adapter simultaneously.
The technical scheme of the utility model as follows:
the utility model provides a nuclear reactor pressure vessel kingbolt hoist, includes the sleeve, locates the hoist mechanism that sleeve upper end can reciprocate for the sleeve, hoist mechanism lower extreme fixed be equipped with the clamp plate, the area of clamp plate is greater than hoist mechanism's mounting hole, telescopic lateral wall processing have the through-hole, installation connecting key in it to welded fastening.
The lifting mechanism is a locking bolt, and a mounting hole of the lifting mechanism is a threaded hole formed in the upper surface of the sleeve and is in threaded fit with the locking bolt; the lower end of the locking bolt is welded with a pressure plate; the area of the pressure plate is larger than that of the threaded hole.
The center of the upper surface of the sleeve is provided with a cylindrical protruding structure, and the center of the upper surface of the sleeve is provided with a threaded hole which penetrates through the protruding structure.
The locking bolt is connected through threads, is arranged in the protruding structure and penetrates into the sleeve.
And a handle is welded at the upper end of the locking bolt.
The handle is fixed on the top of the locking bolt through a pin.
The sleeve top be equipped with rings, rings lower extreme fixed suit in the telescopic upper end outside.
The utility model discloses the effect as follows: after the main bolt lifting appliance is used, the maintenance process of the main sealing element is simplified, the main bolt lifting under the state of installing the adapter is realized, the whole switch cover is operated to respectively disassemble and assemble the main bolt lifting appliance for 2 times and respectively disassemble and assemble the adapter for 1 time, the process is simplified, and the operability is improved.
In addition, the design and connection reliability is high, the sleeve is in threaded connection with the locking bolt, the adapter is pressed through the pressing plate, and the self-locking and anti-falling functions are achieved;
in the whole operation process of opening and closing the cover, the times of detaching and installing the adapter in a reactor plant are reduced from 2 times to 1 time respectively, the operation time is shortened by 50 percent, the key path time of major repair is shortened, the operation time of high-dose environment is shortened, and the irradiated dose of operators is reduced; the improvement of the maintenance efficiency can reduce the times of personnel entering and exiting the radiation pollution isolation area, and reduce the use amount of radiation protection articles and the generation amount of radioactive wastes;
the lifting appliance is simple to operate and high in dismounting efficiency, and the threaded connection adopts a double-thread design, so that the dismounting time of the lifting appliance is shortened.
Drawings
FIG. 1 is a schematic illustration of a kingbolt hanger;
FIG. 2 is a side view of a kingbolt hanger;
in the figure: 1. a hoisting ring; 2. a pin; 3. locking the bolt; 4. a handle; 5. a sleeve; 6. pressing a plate; 7. a connecting key.
Detailed Description
The present invention will be further explained with reference to the drawings and the detailed description.
As shown in fig. 1 and fig. 2, a lifting appliance for a main bolt of a nuclear reactor pressure vessel is composed of a lifting ring 1, a pin 2, a locking bolt 3, a handle 4, a sleeve 5, a pressure plate 6 and 2 connecting keys 7.
Wherein, the sleeve 5 is a cylindrical protruding structure processed at the center of the upper surface, so that the upper surface of the sleeve 5 is in a ladder shape.
The center of the upper surface of the sleeve 5 is provided with a threaded hole which penetrates through the upper convex structure. Through threaded hole installation locking bolt 3, this locking bolt 3's lower extreme welding clamp plate 6, the surface of clamp plate 6 is greater than locking bolt 3's cross-section, consequently when locking bolt 3 reciprocates for sleeve 5 through threaded connection, drives clamp plate 6 and removes, but the direction obtains the restriction, consequently has the anticreep function.
And meanwhile, the pressing plate 6 is moved downwards, can compress the adapter and has a self-locking function. The adapter is the common device of kingbolt installation, is the implementation object of this application.
The lifting ring 1 is positioned above the sleeve 5, and the lower end of the lifting ring is sleeved outside the upper end of the sleeve 5 and is connected together by welding.
The side wall of the sleeve 5 is provided with a through hole, and a connecting key 7 is arranged in the through hole and is welded and fixed.
The lower end of the sleeve 5 is provided with symmetrical through grooves, and the upper end of the sleeve 5 is provided with an internal thread through hole; the upper part of the locking bolt 3 is provided with a through hole, and the lower part is provided with an external thread.
When in use, the utility model is used,
firstly, the handle 4 is rotated anticlockwise (the rotation direction ensures that the pressure plate 6 rises), and the height of the locking bolt 3 is adjusted until the pressure plate 6 is retracted to the top of the sleeve 5;
lifting the lifting ring 1, and placing a lifting appliance of a main bolt of a nuclear reactor pressure vessel on the adapter, so that the connecting key 7 is opposite to the adapter groove when the connecting key and the adapter groove are positioned in the same plumb line;
positioning the sleeve 5 on the adapter along the groove, rotating the sleeve 5 to the bottom counterclockwise;
lifting the sleeve 5, rotating the handle 4 of the locking bolt 3 clockwise, screwing the locking bolt 3 to the bottom, and enabling the pressing plate 6 to press the main bolt adapter;
when the lifting appliance is disconnected from the main bolt, the sleeve 5 is lifted upwards, and the handle 4 is rotated anticlockwise until the pressing plate 6 is completely retracted to the top of the sleeve 5; the handle 4 is lifted to drop the sleeve 5 to the bottom; rotating the sleeve 5 clockwise to the bottom step nine: the handle 4 is lifted and the sleeve 5 is lifted vertically up the adapter groove and out of the sling.
Claims (7)
1. The utility model provides a nuclear reactor pressure vessel kingbolt hoist which characterized in that: including sleeve (5), locate sleeve (5) upper end and can reciprocate for sleeve (5) hoist mechanism, hoist mechanism lower extreme fixed be equipped with clamp plate (6), the area of clamp plate (6) is greater than hoist mechanism's mounting hole, sleeve (5) lateral wall processing have the through-hole, installation connecting key (7) in it to welded fastening.
2. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 1, in which: the lifting mechanism is a locking bolt (3), and a mounting hole of the lifting mechanism is a threaded hole formed in the upper surface of the sleeve and is in threaded fit with the locking bolt (3); the lower end of the locking bolt (3) is welded with a pressure plate (6); the area of the pressure plate (6) is larger than that of the threaded hole.
3. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 2, in which: the center of the upper surface of the sleeve (5) is provided with a cylindrical protruding structure, and the center of the upper surface of the sleeve (5) is provided with a threaded hole which penetrates through the protruding structure.
4. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 3, in which: the locking bolt (3) is connected through threads, is arranged in the protruding structure and penetrates into the sleeve (5).
5. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 3, in which: and a handle (4) is welded at the upper end of the locking bolt (3).
6. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 5, in which: the handle (4) is fixed on the top of the locking bolt (3) through the pin (2).
7. A nuclear reactor pressure vessel kingbolt hanger as claimed in claim 5, in which: the lifting ring is characterized in that a lifting ring (1) is arranged above the sleeve (5), and the lower end of the lifting ring (1) is fixedly sleeved outside the upper end of the sleeve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023262577.XU CN215208001U (en) | 2020-12-30 | 2020-12-30 | Lifting appliance for main bolt of nuclear reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023262577.XU CN215208001U (en) | 2020-12-30 | 2020-12-30 | Lifting appliance for main bolt of nuclear reactor pressure vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215208001U true CN215208001U (en) | 2021-12-17 |
Family
ID=79436501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023262577.XU Active CN215208001U (en) | 2020-12-30 | 2020-12-30 | Lifting appliance for main bolt of nuclear reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215208001U (en) |
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2020
- 2020-12-30 CN CN202023262577.XU patent/CN215208001U/en active Active
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