CN212514333U - Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer - Google Patents
Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer Download PDFInfo
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- CN212514333U CN212514333U CN202020939683.8U CN202020939683U CN212514333U CN 212514333 U CN212514333 U CN 212514333U CN 202020939683 U CN202020939683 U CN 202020939683U CN 212514333 U CN212514333 U CN 212514333U
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- heating element
- source
- electric heating
- radiographic inspection
- voltage stabilizer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model discloses a stabiliser electric heating element welding seam radiographic inspection's source positioner, including the film tray, the film tray on be provided with the compact heap, still be provided with the support base on the film tray, the one end of two-way screw rod is passed and is supported the base and be connected with the compact heap, the other end and the butterfly nut of two-way screw rod are connected, are connected with the upper portion component through set screw on the film tray, source locating rack and upper portion component connection. The beneficial effects of the utility model reside in that: it can improve work efficiency, reduce irradiation dose.
Description
Technical Field
The utility model belongs to ray inspection device, concretely relates to stabiliser electric heating element welding seam radiographic inspection's source positioner.
Background
The reactor coolant system is the core system within the primary pressure boundary of a nuclear power plant, and its normal operation plays a crucial role in nuclear safety. The pressure rise of the coolant system is mainly achieved by means of 63 electric heating elements at the lower part of the pressurizer. The life expectancy of the electrical heating elements is about 20 years less than the overall operating life of the nuclear power plant, and therefore, each electrical heating element needs to be replaced individually during shutdown maintenance of the nuclear power plant.
The 63 electric heating elements are respectively arranged on three concentric circles with the diameters of 1320.8mm, 1092.2mm and 863.6mm by taking the axis of the lower end socket of the voltage stabilizer as the center of a circle. The electric heating element is installed in the voltage stabilizer through a penetrating pipe sleeve welded on the inner side of the lower end socket of the voltage stabilizer, and the sealing performance of the electric heating element and the pipe sleeve is guaranteed through welding.
In order to ensure the quality of the assembly of such a weld, it is necessary to perform a radiographic inspection. When the method is implemented, the radioactive source and the film are respectively arranged on two sides of the central plane of the detected welding line, and because the trend of most defects extends along the thickness direction, the irradiation direction of the radioactive source is perpendicular to the axis of the electric heating element and the film plane as far as possible, and two transilluminations are carried out in a mode of mutually 90 degrees so as to improve the detectable rate of the defects.
During the in-service inspection, the radiation dose at the bottom of the voltage stabilizer reaches several milli-Watts, the conventional inspection is adopted, the negative film cassette and the source conduit are fixed by using adhesive tapes or elastic ropes, a plurality of people take a few minutes to finish the inspection, the whole irradiation dose is high, and the working efficiency is low. Various cables at the bottom of the voltage stabilizer are criss-cross, the operation space and the observation range of personnel are very limited, the accurate positioning and installation of a radioactive source and a film are difficult to ensure, the welding seam image is easy to distort, the defects are difficult to identify, and the ideal film quality can be obtained by repeated tests.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stabiliser electric heating element welding seam radiographic inspection's source positioner, it can improve work efficiency, reduces the irradiation dose.
The technical scheme of the utility model as follows: a source positioning device for radiographic inspection of welding seam of electric heating element of voltage stabilizer comprises
The film tray is provided with a pressing block, the film tray is further provided with a supporting base, one end of a bidirectional screw rod penetrates through the supporting base to be connected with the pressing block, the other end of the bidirectional screw rod is connected with a butterfly nut, the film tray is connected with an upper component through a positioning screw, and a source positioning frame is connected with the upper component.
The line between the axis of the source locating rack and the axis of the upper component base is vertical to the plane of the film tray.
The pressing block adopts a cambered surface structure.
The upper component base adopts a cambered surface structure.
The axial movement of the pressing block is realized by the bidirectional screw and the supporting base.
The upper component is provided with a rubber gasket.
The bottom surface of the upper component is arranged on the upper surface of the film tray through a positioning screw, the inner side cambered surface and the pressing block form a clamping part of the electric heating element together, and the upper hollow slide rod can ensure that the source positioning frame can move up and down perpendicular to the axis of the electric heating element.
The beneficial effects of the utility model reside in that:
when the source conduit with the ray source penetrates into the guide tube of the positioning frame, the axis of the guide tube can be completely coincided with the axis of the ray source. The upper component consists of an arc base with the curvature close to that of the electric heating element and a hollow support rod, when the special device is fixed on the electric heating element, the base of the upper component can be tightly attached to the outer surface of the electric heating element, the axis of the base coincides with the axis of the electric heating element, and meanwhile, the base and the film tray can compress the film cartridge together, so that the purpose that the film is tightly attached to the detected welding line is achieved. By realizing the appearance design of the guide tube, the base and the film tray, the device effectively ensures that rays vertically transilluminate the image of the detected welding line onto the film along the axis of the electric heating element, and reduces the image distortion;
the source positioning frame is formed by welding a cylindrical sliding chute and a square sliding rod which are vertical to each other, and the square sliding rod and the hollow inner wall of the upper component, the inner wall of the cylindrical sliding chute and the outer wall of the source conduit are in clearance fit, so that the square sliding rod can move up and down along the axis of the upper component; the catheter used for wrapping the radioactive source can freely adjust the extension length according to the relative position of the welding line, and is fixed by a nut after reaching the designated position, so that the aim of freely positioning the radioactive source in a narrow space in a three-dimensional space is fulfilled;
the contact parts between the positioning device and the electric heating element are mainly an upper component base and a pressing block, and the total contact surface exceeds the 270-degree range of the outer wall of the whole pipeline, so that the stress on the surface of the electric heating element is very uniform, and the electric heating wire in the pipeline cannot be adversely affected. In order to protect the surface of the electric heating element and increase the friction force, rubber pads are arranged on all the contact surfaces;
a right-handed threaded hole with a certain length is formed in the rear end of a pressing block of the positioning device, and one end of a bidirectional screw penetrates out of a screw base on the film tray and is finally installed on the pressing block; the other end is provided with a butterfly nut which can be manually rotated. When needed, the butterfly nut at the rear end of the bidirectional screw rod is screwed, so that the pressing block can be quickly pushed to the designated position, the linear stroke of the screw rod is effectively controlled, and the applicability of the positioning device in a narrow space is improved.
Drawings
Fig. 1 is a schematic view of a source positioning device for radiographic inspection of a welding seam of an electric heating element of a voltage stabilizer.
In the figure, a source positioning frame 1, an upper component 2, a rubber gasket 3, a film tray 4, a positioning screw 5, a pressing block 6, a supporting base 7, a butterfly nut 8 and a bidirectional screw 9 are arranged.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a stabiliser electric heating element welding seam radiographic inspection's source positioner is including active locating rack 1, upper portion component 2, rubber packing ring 3, film tray 4, set screw 5, compact heap 6, support base 7, butterfly nut 8 and two-way screw rod 9.
As shown in fig. 1, a pressing block 6 is arranged on a film tray 4, a supporting base 7 is further arranged on the film tray 4, one end of a bidirectional screw 9 penetrates through the supporting base 7 to be connected with the pressing block 6, the other end of the bidirectional screw 9 is connected with a butterfly nut 8, an upper component 2 is connected to the film tray 4 through a positioning screw 5, a rubber gasket 3 is arranged on the upper component 2, a source positioning frame 1 is connected with the upper component 2, and a connecting line between the axis of the source positioning frame 1 and the axis of the base of the upper component 2 can be kept perpendicular to the plane of the film tray 4.
The axial and radial distances of the source positioning frame 1 relative to the detected welding seam can be freely adjusted.
The pressing block 6 and the base of the upper component 2 adopt cambered surface structures and are tightly attached to the surface of the electric heating element.
The axial movement of the pressing block 6 is realized by adopting the bidirectional screw 9 and the supporting base 7.
The utility model discloses mainly there is three function, is magazine laminating, pipeline centre gripping and source pipe location respectively, and is corresponding realized by film tray 4, upper portion component 2, compact heap 6 and source locating rack 1 etc..
All parts are in modular design and are connected by adopting a screw or welding mode.
The upper component 2 is a key part of the whole positioning device, the bottom surface of the upper component is installed on the upper surface of the film tray 4 through a positioning screw 5, the inner side cambered surface and the pressing block 6 form a clamping part of the electric heating element together, and the upper hollow slide rod can ensure that the source positioning frame 1 can move up and down perpendicular to the axis of the electric heating element.
During radiographic inspection, the film cartridge is placed in the middle of the film tray 4, the groove in the middle of the tray enables the film cartridge to be extruded by the electric heating element with a certain deformation allowance, and the intensifying screen and the film in the film cartridge cannot be damaged, so that the false image is avoided being generated on the film.
When the positioning device is installed, the film tray 4 can be held by one hand, and the base of the upper component 2 is sleeved on the electric heating element from the side. And then the butterfly nut 8 on one side of the supporting base 7 is rotated to enable the pressing block 6 to slide along the surface of the tray until the electric heating element is tightly held. Since the distance from the inner arc surface of the upper member 2 to the plane of the tray is designed to be slightly smaller than the thickness of the film cartridge, the compressed electric heating element can be brought into close contact with the film cartridge. And finally, adjusting the position of the source conduit to a corresponding position according to the distance between the detected welding line and the end surface of the base of the upper component 2, and fixing by using a butterfly nut 8. The distance from the source conduit to the film cartridge can be adjusted correspondingly according to the on-site space position, and the ray transillumination direction can not be shielded.
The utility model has the characteristics as follows:
(1) the coaxial structure of the upper component 2 and the source positioning frame 1 can ensure the accuracy of the space positioning of the ray source and the detected welding line.
(2) The square sliding rod can ensure the free adjustment of the radiographic inspection focal length, prevent the radioactive source from deflecting due to the action of external force and reduce the potential safety hazard.
(3) The cambered surface appearance structures of the upper component 2 and the pressing block 6 ensure that the surface of the outer surface of the pipeline cannot be scratched in the tool installation process, and more importantly, the clamping force is large, the reliability is high, and the positioning repeatability is good;
(4) the structure type that drives the compressing block 6 to move through the bidirectional screw rod 9 greatly improves the efficiency of installing and dismantling the tool rack, and the tool rack has small and exquisite appearance size and strong field applicability.
Claims (7)
1. The utility model provides a source positioner of stabiliser electric heating element welding seam radiographic inspection which characterized in that: comprises that
The film tray is provided with a pressing block, the film tray is further provided with a supporting base, one end of a bidirectional screw rod penetrates through the supporting base to be connected with the pressing block, the other end of the bidirectional screw rod is connected with a butterfly nut, the film tray is connected with an upper component through a positioning screw, and a source positioning frame is connected with the upper component.
2. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the line between the axis of the source locating rack and the axis of the upper component base is vertical to the plane of the film tray.
3. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the pressing block adopts a cambered surface structure.
4. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the upper component base adopts a cambered surface structure.
5. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the axial movement of the pressing block is realized by the bidirectional screw and the supporting base.
6. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the upper component is provided with a rubber gasket.
7. The source-positioning device for the radiographic inspection of the weld of the electrical heating element of a voltage stabilizer of claim 1, wherein: the bottom surface of the upper component is arranged on the upper surface of the film tray through a positioning screw, the inner side cambered surface and the pressing block form a clamping part of the electric heating element together, and the upper hollow slide rod can ensure that the source positioning frame can move up and down perpendicular to the axis of the electric heating element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939683.8U CN212514333U (en) | 2020-05-29 | 2020-05-29 | Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020939683.8U CN212514333U (en) | 2020-05-29 | 2020-05-29 | Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer |
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| Publication Number | Publication Date |
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| CN212514333U true CN212514333U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020939683.8U Active CN212514333U (en) | 2020-05-29 | 2020-05-29 | Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758948A (en) * | 2020-05-29 | 2021-12-07 | 中核武汉核电运行技术股份有限公司 | Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer |
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2020
- 2020-05-29 CN CN202020939683.8U patent/CN212514333U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758948A (en) * | 2020-05-29 | 2021-12-07 | 中核武汉核电运行技术股份有限公司 | Source positioning device for radiographic inspection of welding line of electric heating element of voltage stabilizer |
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