CN111267043A - Tool and method for adjusting center position of inclined manhole cover plate of nuclear power station - Google Patents
Tool and method for adjusting center position of inclined manhole cover plate of nuclear power station Download PDFInfo
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- CN111267043A CN111267043A CN202010175183.6A CN202010175183A CN111267043A CN 111267043 A CN111267043 A CN 111267043A CN 202010175183 A CN202010175183 A CN 202010175183A CN 111267043 A CN111267043 A CN 111267043A
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- nut
- connecting plate
- manhole cover
- adjusting
- cover plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
Abstract
The invention belongs to the technical field of mechanical design, and particularly relates to a tool and a method for adjusting the center position of a deflected manhole cover plate of a nuclear power station, wherein the tool comprises the following components: the device comprises a flange bolt, a manhole cover plate, a main body nut, an upper limiting nut, a lower limiting nut, a connecting plate I, a connecting plate II, a nut, a single-head bolt, a supporting plate and an adjusting bolt; the lower end of the flange bolt is arranged in the manhole cover plate; the upper end of the flange bolt is sequentially provided with a lower limiting nut, a main body nut and an upper limiting nut from bottom to top; one end of the first connecting plate is inserted into one side of the main body nut, fillet welding is carried out at the inserting position, the second connecting plate is perpendicular to the other end of the first connecting plate and is welded and connected with the other end of the first connecting plate, the supporting plate and the connecting plate are arranged in parallel, the upper portion of the supporting plate is fixedly connected with the second connecting plate through a single-end bolt and a nut, and the lower portion of the supporting plate is provided with an adjusting bolt; the flange bolts and the manhole cover plate.
Description
Technical Field
The invention belongs to the technical field of mechanical design, and particularly relates to a tool and a method for adjusting the center position of a deflected manhole cover plate of a nuclear power station.
Background
Each unit of a third period of a certain nuclear power station is provided with 3 steam generators, each steam generator is provided with 1 manhole at a cold end and a hot end, the manholes are arranged in a skew mode, included angles of the manholes and the horizontal direction are 40 degrees +/-15', the cover plate is about 0.3t in weight, and the manholes are in flange fastening connection. When the steam generator primary side manhole unsealing work is executed every time, due to the fact that the cover plate is arranged in a deflection mode, after the bolt is stretched by the bolt stretching machine and the nut is loosened, the bolt loses pretightening force, the cover plate naturally moves downwards under the action of gravity of the cover plate and changes with the center position of the manhole until the inner wall of the bolt hole of the cover plate is in contact with the bolt, and the difficulty in dismantling the bolt is finally caused due to the fact that the cover plate partially acts on the bolt through weight.
The method that uses at present is through the chain block to the apron position adjustment, with chain block and manhole top hand eye overhaul platform girder steel be connected, because on-the-spot space is narrow, the hoisting point conflicts with steam generator body heat preservation position, if use this method, need relevant cooperation personnel to demolish nearly 10 steam generator body heat preservation positions, and work load is great, consuming time and difficultly, increases personnel and shines the dose moreover, has certain jack-up risk simultaneously.
Therefore, in order to solve the problems of the actual field disassembly and assembly situations, it is necessary to design and develop a tool and a method for adjusting the center position of the inclined manhole cover plate of the nuclear power plant, so as to avoid the disassembly work of the related heat preservation device of the steam generator, reduce the irradiation dose of personnel, improve the cover plate disassembly efficiency, and reduce the industrial safety risk caused by the related lifting work when the primary side manhole of the steam generator is unsealed.
Disclosure of Invention
The invention aims to design a tool and a method for adjusting the center position of a deflected manhole cover plate of a nuclear power station, which are used for solving the technical problems that when the primary side manhole of a steam generator is unsealed, the inner wall of a bolt hole of the cover plate extrudes a bolt to be disassembled due to the change of the center position of the deflected manhole cover plate, the bolt to be disassembled is difficult to disassemble, the cover plate is low in disassembling efficiency, and the irradiation dose of operators is increased.
The technical scheme of the invention is as follows:
a nuclear power station inclined manhole cover plate center position adjusting tool comprises: the device comprises a flange bolt 2, a manhole cover plate 1, a main body nut 3, an upper limiting nut 4, a lower limiting nut 5, a connecting plate I6, a connecting plate II 7, a nut 8, a single-head bolt 9, a supporting plate 10 and an adjusting bolt 12; the lower end of the flange bolt 2 is arranged in the manhole cover plate 1; the upper end of the flange bolt 2 is sequentially provided with a lower limiting nut 5, a main body nut 3 and an upper limiting nut 4 from bottom to top; one end of the first connecting plate 6 is inserted into one side of the main body nut 3, fillet welding is carried out at the inserting position, the second connecting plate 7 is vertically arranged with the other end of the first connecting plate 6 and is welded, the supporting plate 10 is arranged in parallel with the second connecting plate 7, the upper part of the supporting plate 10 is tightly connected with the second connecting plate 7 through a single-head bolt 9 and a nut 8, and the lower part of the supporting plate 10 is provided with an adjusting bolt 12; the flange bolts 2 and the manhole cover plate 1.
A gasket 11 is also arranged between the nut 8 and the support plate 10.
One end of the first connecting plate 6 is inserted into the depth of about 5mm in one side of the main body nut 3, and the fillet height of the fillet weld at the inserting position is 4 mm.
The other end of the second connecting plate 7 and the other end of the first connecting plate 6 are welded in a right-angle mode, and the welding height is 4 mm.
The thickness of the first connecting plate 6 and the thickness of the second connecting plate 7 are both 20 mm.
The height of the upper limit nut 4 and the lower limit nut 5 is 30mm, and the maximum outer diameter is 80 mm.
The method for adjusting the center position adjusting tool of the inclined manhole cover plate of the nuclear power station comprises the following steps:
the method comprises the following steps: when the flange bolt is used, the lower limiting nut 5, the main body nut 3 and the upper limiting nut 4 are installed on the selected flange bolt 2;
step two: adjusting the position of the main body nut 3, rotating the main body nut 3 until the connecting plate II 7 is perpendicular to the radial direction of the manhole cover plate 1, and rotating the upper limit nut 4 and the lower limit nut 5 to be attached to the main body nut 3;
step three: the supporting plate 10 is installed through the single-head bolt 9, the nut 8 and the gasket 11, the supporting plate 10 is fixedly connected with the second connecting plate 7, the adjusting bolt 12 is installed, one end of the adjusting bolt 12 is in contact with the manhole cover plate 1, and the center position adjusting effect of the manhole cover plate 1 is achieved through rotating the adjusting bolt 12.
The invention has the beneficial effects that:
1) the center position adjusting tool for the inclined manhole cover plate of the nuclear power station equipment has the advantages of light weight, small volume, convenience in carrying, simple structure and principle, simple operation steps and low manufacturing cost, and has certain popularization significance;
2) the tool main body part is installed by utilizing an on-site flange bolt, the anti-rotation limiting nut is arranged, the central position of the cover plate is adjusted by adjusting the adjusting bolt on the supporting plate, and the number of the used tools and the position of the bolt can be determined according to the actual deflection position of the on-site cover plate;
3) the invention has compact and reliable structure after being assembled, can effectively solve the problem of position adjustment of the inclined manhole cover plate of the power station equipment, improves the field operation efficiency, reduces the irradiation dose of personnel and reduces the safety risk of the field operation.
Drawings
FIG. 1 is a schematic diagram of a center position adjustment tool for a biased manhole cover of nuclear power plant equipment according to the present invention;
wherein: 1. a manhole cover plate; 2. a flange bolt; 3. a body nut; 4. an upper limiting nut; 5. a lower limit nut; 6. a first connecting plate; 7. a second connecting plate; 8. a nut; 9. a single-headed bolt; 10. a support plate; 11. a gasket; 12. and adjusting the bolt.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples, in which:
a tool and a method for adjusting the center position of a deflected manhole cover plate of a nuclear power station comprise the following steps: the device comprises a flange bolt 2, a manhole cover plate 1, a main body nut 3, an upper limiting nut 4, a lower limiting nut 5, a connecting plate I6, a connecting plate II 7, a nut 8, a single-head bolt 9, a supporting plate 10 and an adjusting bolt 12; the lower end of the flange bolt 2 is arranged in the manhole cover plate 1; the upper end of the flange bolt 2 is sequentially provided with a lower limiting nut 5, a main body nut 3 and an upper limiting nut 4 from bottom to top; one end of the first connecting plate 6 is inserted into one side of the main body nut 3, fillet welding is carried out at the inserting position, the second connecting plate 7 is vertically arranged with the other end of the first connecting plate 6 and is welded, the supporting plate 10 is arranged in parallel with the second connecting plate 7, the upper part of the supporting plate 10 is tightly connected with the second connecting plate 7 through a single-head bolt 9 and a nut 8, and the lower part of the supporting plate 10 is provided with an adjusting bolt 12; the flange bolts 2 and the manhole cover plate 1.
A gasket 11 is also arranged between the nut 8 and the support plate 10.
One end of the first connecting plate 6 is inserted into the depth of about 5mm in one side of the main body nut 3, and the fillet height of the fillet weld at the inserting position is 4 mm.
The other end of the second connecting plate 7 and the other end of the first connecting plate 6 are welded in a right angle mode, and the welding height is 4 mm.
The thickness of the first connecting plate 6 and the thickness of the second connecting plate 7 are both 20 mm.
The height of the upper limit nut 4 and the lower limit nut 5 is 30mm, and the maximum outer diameter is 80 mm.
The method for adjusting the center position adjusting tool of the inclined manhole cover plate of the nuclear power station comprises the following steps:
the method comprises the following steps: when the flange bolt is used, the lower limiting nut 5, the main body nut 3 and the upper limiting nut 4 are installed on the selected flange bolt 2;
step two: adjusting the position of the main body nut 3, rotating the main body nut 3 until the connecting plate II 7 is perpendicular to the radial direction of the manhole cover plate 1, and rotating the upper limit nut 4 and the lower limit nut 5 to be attached to the main body nut 3;
step three: the supporting plate 10 is installed through the single-head bolt 9, the nut 8 and the gasket 11, the supporting plate 10 is fixedly connected with the second connecting plate 7, the adjusting bolt 12 is installed, one end of the adjusting bolt 12 is in contact with the manhole cover plate 1, and the center position adjusting effect of the manhole cover plate 1 is achieved through rotating the adjusting bolt 12.
The field use of the tool of the invention is further described below with reference to the examples of implementation:
[1] selecting tool mounting bolts and mounting quantity;
[2] a lower limiting nut 5, a main body nut 3 and an upper limiting nut 4 are sequentially installed;
[3] adjusting the position of the main nut 3 until the second connecting plate 7 is perpendicular to the radial direction of the manhole cover plate 1, and rotating the upper limit nut 4 and the lower limit nut 5 to be attached to the upper limit nut and the lower limit nut;
[4] a supporting plate 10 is installed and is fixedly connected with the second connecting plate 7 through a single-head bolt 9, a nut 8 and a gasket 11;
[5] installing an adjusting bolt 12, wherein the adjusting bolt 12 is in threaded connection with the support plate 10;
[6] the adjustment of the position of the cover plate can be realized by slowly screwing in or screwing out the adjusting bolt 12.
In the process of adjusting the position of the manhole cover plate 1, a chain block does not need to be installed and a heat preservation device on the steam generator body does not need to be removed, the tool is only needed to be installed through the flange bolts in corresponding quantity, the effect of adjusting the central position of the manhole cover plate can be achieved through rotating the adjusting bolt 12, meanwhile, the tool is convenient to disassemble and assemble, the operation steps are simple, the field operation efficiency can be improved, and the possibility of safety and adjusting the central position of the cover plate is realized.
The above description takes the adjustment of the manhole cover plate position on the primary side of an M310 type steam generator as an example, and briefly explains the use method of the tool, and the tool is not only suitable for adjusting the manhole cover plate position of the steam generator in a nuclear power station, but also suitable for various devices with inclined manholes.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (7)
1. The utility model provides a nuclear power station inclined manhole cover central point puts adjusting tool which characterized in that includes: the manhole cover plate comprises a flange bolt (2), a manhole cover plate (1), a main body nut (3), an upper limiting nut (4), a lower limiting nut (5), a connecting plate I (6), a connecting plate II (7), a nut (8), a single-head bolt (9), a supporting plate (10) and an adjusting bolt (12); the lower ends of the flange bolts (2) are arranged in the manhole cover plate (1); the upper end of the flange bolt (2) is sequentially provided with a lower limiting nut (5), a main body nut (3) and an upper limiting nut (4) from bottom to top; one end of the first connecting plate (6) is inserted into one side of the main body nut (3) and fillet welding is carried out at the inserting position, the second connecting plate (7) is vertically arranged with the other end of the first connecting plate (6) and is welded with the other end of the first connecting plate, the support plate (10) is arranged in parallel with the second connecting plate (7), the upper part of the support plate (10) is fixedly connected with the second connecting plate (7) through a single-head bolt (9) and a nut (8), and the lower part of the support plate (10) is provided with an adjusting bolt (12); the flange bolts (2) and the manhole cover plate (1).
2. The tool for adjusting the center position of the inclined manhole cover plate of the nuclear power plant as claimed in claim 1, wherein: and a gasket (11) is also arranged between the nut (8) and the support plate (10).
3. The tool for adjusting the center position of the inclined manhole cover plate of the nuclear power plant as claimed in claim 2, wherein: one end of the first connecting plate (6) is inserted into the depth of the inner part of one side of the main body nut (3) by about 5mm, and the height of a welding corner of the fillet weld at the inserting position is 4 mm.
4. The tool for adjusting the center position of the inclined manhole cover plate of the nuclear power plant as claimed in claim 3, wherein: the other end welding mode of the second connecting plate (7) and the first connecting plate (6) is right-angle welding, and the welding height is 4 mm.
5. The tool for adjusting the center position of the inclined manhole cover plate of the nuclear power plant as claimed in claim 4, wherein: the thickness of the first connecting plate (6) and the thickness of the second connecting plate (7) are both 20 mm.
6. The tool for adjusting the center position of the inclined manhole cover plate of the nuclear power plant as claimed in claim 5, wherein: the height of the upper limiting nut (4) and the lower limiting nut (5) is 30mm, and the maximum outer diameter is 80 mm.
7. The method for adjusting the center position adjusting tool of the inclined manhole cover of the nuclear power plant as claimed in any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: when the flange bolt is used, the lower limiting nut (5), the main body nut (3) and the upper limiting nut (4) are installed on the selected flange bolt (2);
step two: adjusting the position of the main body nut (3), rotating the main body nut (3) to a second connecting plate (7) which is perpendicular to the radial direction of the manhole cover plate (1), and rotating the upper limit nut (4) and the lower limit nut (5) to be attached to the main body nut (3);
step three: the supporting plate (10) is installed through the single-head bolt (9), the nut (8) and the gasket (11), the supporting plate (10) is fixedly connected with the second connecting plate (7), the adjusting bolt (12) is installed, one end of the adjusting bolt (12) is in contact with the manhole cover plate (1), and the central position adjusting effect of the manhole cover plate (1) is achieved through rotation of the adjusting bolt (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010175183.6A CN111267043A (en) | 2020-03-13 | 2020-03-13 | Tool and method for adjusting center position of inclined manhole cover plate of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010175183.6A CN111267043A (en) | 2020-03-13 | 2020-03-13 | Tool and method for adjusting center position of inclined manhole cover plate of nuclear power station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111267043A true CN111267043A (en) | 2020-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010175183.6A Pending CN111267043A (en) | 2020-03-13 | 2020-03-13 | Tool and method for adjusting center position of inclined manhole cover plate of nuclear power station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111267043A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112548927A (en) * | 2020-11-24 | 2021-03-26 | 江苏核电有限公司 | Special tool for disassembling and assembling manhole of horizontal high-pressure heater of nuclear power station |
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| CN209394278U (en) * | 2018-12-28 | 2019-09-17 | 中核核电运行管理有限公司 | A kind of cover plate for manhole centralising device |
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2020
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| KR20120007414U (en) * | 2011-04-19 | 2012-10-29 | 현대중공업 주식회사 | Adjusting jig of the difference in the level of pipe flanges |
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| CN112548927A (en) * | 2020-11-24 | 2021-03-26 | 江苏核电有限公司 | Special tool for disassembling and assembling manhole of horizontal high-pressure heater of nuclear power station |
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