CN201378437Y - Clamping and holding device for main nut eddy current check probe of nuclear pressure vessel - Google Patents
Clamping and holding device for main nut eddy current check probe of nuclear pressure vessel Download PDFInfo
- Publication number
- CN201378437Y CN201378437Y CN200820182471U CN200820182471U CN201378437Y CN 201378437 Y CN201378437 Y CN 201378437Y CN 200820182471 U CN200820182471 U CN 200820182471U CN 200820182471 U CN200820182471 U CN 200820182471U CN 201378437 Y CN201378437 Y CN 201378437Y
- Authority
- CN
- China
- Prior art keywords
- eddy current
- main nut
- pressure vessel
- probe
- mother nut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model relates to a clamping and holding device for a main nut eddy current check probe, in particular to a clamping and holding device for a main nut eddy current check probe of a nuclear pressure vessel. The clamping and holding device is characterized in that a bolt block is formed by connecting two top blocks through sliding core shafts; and a spring is sleeved outside each core shaft, thereby, the two top blocks can be elastically connected. Under the action of the spring force, threads on the surface of the bolt block can be ideally and movably attached to threads of a main nut under check so that the main nut eddy current check probe of the nuclear pressure vessel can be attached to the threads of the main nut all the way so as to collect effective signals and check the eddy current of the threads of the main nut. The bolt block is made of non-metal material, and the attrition of the threads of the bolt block can be automatically remedied. The elastic connection of the two top blocks can effectively prevent the clamping and holding device for the main nut eddy current check probe from being clamped in the main nut in the rotation process.
Description
Technical field
The utility model relates to nut eddy current inspection probe clamping device, is specifically related to a kind of nuclear pressure vessel mother nut eddy current inspection probe clamper.
Background technology
Nuclear pressure vessel is the garden bulk containers of about 4 meters of high nearly 10 rice diameters, comprise compositions such as pressure container cylinder, pressure vessels top cover and kingbolt, more than 150 millimeter high nearly 2 meters kingbolt of nearly 40 diameters is used for top cover and pressure container cylinder connection are compressed sealing.The nuclear pressure vessel mother nut is the important composition parts of reactor vessel, and their integrality is most important to the safe operation of reactor.Because they work under high temperature, high pressure conditions for a long time, and in the effect of opening, all will bear low-cycle fatigue stress when shutdown and variable power.Therefore, be easy to generate crackle perpendicular to the kingbolt central axial direction at the area of stress concentration of thread root, and under this bad working environment rapidly expansion until damage.In order to prevent the generation of this situation, nuclear power plant in labour inspection outline all regulation need make regular check on to kingbolt, mother nut.
According to the requirement of coherence check standard, must regularly implement eddy current inspection to these mother nuts, whether there is the defective of screw thread fracture to check threaded area.To implement eddy current inspection to mother nut, must use a cover automatic checking device, the eddy current inspection probe is fixed on threaded area,, finish the collection and the inspection of eddy current signal by driving the rotation of mother nut.Eddy current inspection probe wherein is an important device of this complete equipment, directly has influence on the quality of signals that eddy current inspection is gathered.
The Framatome of France has researched and developed and has been used for the automatic checking device that mother nut is checked, but this technology belongs to the core technology restriction to Chinese exports.Domestic do not have similar techniques and a checkout facility yet.
Nuclear pressure vessel mother nut eddy current inspection machine mainly partly is made up of eddy current inspection probe, probe clamper, turning joint, straight line follower etc.Present employed probe clamper is the bolt piece of a thread surface and mother nut threads engaged.As an inspection part on the mother nut inspection machine, the function of probe clamper is along with the thread on the probe clamper slides along the screw thread on the mother nut that rotates, and realizes passive the moving up and down of follower, implements the eddy current inspection of screw thread.The shortcoming of this monoblock type probe clamper is: in checking process because of clamper mismachining tolerance, tens be examined the scale error of kingbolt and exist according to the motion designing requirement with the gap that is examined the bolt surface, can cause radially rocking relatively of clamper, thereby produce the eddy current inspection noise signal; Mother nut has certain rocking during inspection, adopts rigid unitary formula structure, can't guarantee the applying at any time on clamper thread surface and mother nut surface; Probe clamper is stuck in the interior situation of mother nut to the monoblock type probe clamper in the rotation process because the wearing and tearing of dimensioned error, weather temperature variation (clamper expands or dwindles), clamper screw thread can cause, and influences the efficient of inspection work.
Summary of the invention
The purpose of this utility model is to provide a kind of can keep desirable nuclear pressure vessel mother nut eddy current inspection probe clamper of fitting with mother nut screw thread to be detected, and it can effectively guarantee carrying out smoothly of mother nut inspection work.
Realize the technical scheme of the utility model purpose:
A kind of nuclear pressure vessel mother nut eddy current inspection probe clamper, it is the bolt piece of thread surface and mother nut threads engaged, this bolt piece comprises by some auxiliary jacking blocks of mandrels connection and main jacking block, one end of mandrel is fixedlyed connected with auxiliary jacking block, the other end of mandrel radially slides with main jacking block and is connected, and each mandrel is with spring outward.
Aforesaid a kind of nuclear pressure vessel mother nut eddy current inspection probe clamper, bolt piece adopt the polyformaldehyde resin material to make, and mandrel adopts oily bronze material to make.
Effect of the present utility model is: the bolt piece is formed by connecting two jacking blocks by the slip mandrel, each mandrel is with spring outward, this structure has realized that the elasticity between two jacking blocks connects, effect by spring force, can realize the desirable servo-actuated applying of bolt piece thread surface and detected mother nut screw thread, nuclear pressure vessel mother nut eddy current probe can be fitted on the screw thread of mother nut all the time, gather useful signal, carry out the eddy current inspection of mother nut screw thread.The bolt piece adopts nonmetallic materials, and its thread abrasion can remedy automatically.Adopt elasticity to connect effectively to avoid probe clamper in the rotation process to be stuck in situation in the mother nut.
Description of drawings
Fig. 1 is the structural representation of a kind of nuclear pressure vessel mother nut eddy current inspection probe clamper provided by the utility model;
Fig. 2 is the part figure of the mandrel spring of Fig. 1;
Fig. 3 is for using the three-dimensional structure synoptic diagram of nuclear pressure vessel mother nut eddy current inspection machine of the present utility model.
Among the figure: 1. auxiliary jacking block; 2. main jacking block; 3. mandrel; 4. spring; 5. probe lifts contiguous block; 6. Rotary tray; 7. mother nut; 8. probe follow-up device; 9. axle sleeve.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1, a kind of nuclear pressure vessel mother nut eddy current inspection probe clamper, it is the bolt piece of thread surface and mother nut threads engaged, the bolt piece adopts the polyformaldehyde resin material to make.This bolt piece comprises by four mandrels 3 fixedly connected auxiliary jacking block 1 and main jacking block 2, each mandrel 3 outer spring 4 that are with.One end of mandrel 3 is fixedlyed connected with auxiliary jacking block 1, and the other end of mandrel 3 radially slides with main jacking block 2 and is connected, each mandrel 3 outer spring 4 that are with.Connection mandrel 3 between auxiliary jacking block 1 and the main jacking block 2 also can be 5,6 or 7 etc.As shown in Figure 2, one end of mandrel 3 is fixedlyed connected with auxiliary jacking block 1, the other end radially slides with main jacking block 2 and is connected and can realizes in the following manner: have radial hole on the main jacking block 2, the hole internal fixation has axle sleeve 9, be provided with the mandrel 3 that is slidingly connected with it in the axle sleeve 9, the other end of mandrel 3 is threaded with auxiliary jacking block 1.At mandrel 3 overcoat upper springs 4, adopt compression spring 4 distendings between auxiliary jacking block 1 and the main jacking block 2, making mandrel 3 is the certain adjusting sliding scale of radially having of mother nut in the distending direction.Two jacking blocks distending diametrically have the maximum magnitude restriction, in use can not come off.
Concrete use-pattern is as follows:
As shown in Figure 3, nuclear pressure vessel mother nut 7 is placed on the nuclear pressure vessel mother nut inspection machine Rotary tray 6, eddy current probe is installed in probe clamper, probe is connected with eddy detecting instrument.The elasticity probe clamper is hung on eddy current inspection probe follow-up device 8 by probe lifting contiguous block 5.The compression probe clamper makes the external diameter of bolt piece less than the internal diameter of mother nut 7, and probe clamper is put into mother nut 7, makes the lower thread of bolt piece and a top screw-threaded engagement 4-5 screw thread of mother nut 7.Start Rotary tray 6, mother nut 7 begins rotation, makes probe clamper move to mother nut 7 bottoms by worm drive, arrives when checking reference position to stop operating.Start Rotary tray 6 and make its backward rotation, worm drive move to mother nut 7 tops with probe clamper, and eddy current probe breaks away from the mother nut threaded portion simultaneously.Probe clamper is being moved to by the bottom in the process at top, and the eddy detection system acquired signal is implemented mother nut 7 screw thread eddy current inspections.In whole motion process, hold out against mutually by four springs 4 between the auxiliary jacking block 1 of probe clamper and the main jacking block 2, the thread surface of bolt piece and the screw thread of mother nut are coincide, probe clamper compresses with being examined threaded area all the time under the effect of spring, has guaranteed that eddy current probe well contacts with mother nut 7 screw threads.
Elasticity probe clamper of the present utility model guaranteed in the checking process clamper can be under the effect of external force all the time be examined screw thread and keep servo-actuated to fit, avoided the monoblock type clamper in checking process because of clamper mismachining tolerance, tens be examined the scale error of kingbolt and exist according to the motion designing requirement with the gap that is examined the bolt surface, causedly radially rock relatively, eliminated because of radially rocking the eddy current inspection noise signal of generation, make that the eddy current signal gatherer process is steady, non-jitter.Therefore simultaneously, because thread abrasion can be offset automatically under the effect of spring force, can prolong bolt piece serviceable life.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.If these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (2)
1. nuclear pressure vessel mother nut eddy current inspection probe clamper, it is the bolt piece of thread surface and mother nut threads engaged, it is characterized in that: this bolt piece comprises auxiliary jacking block (1) and the main jacking block (2) that connects by some mandrels (3), one end of mandrel (3) is fixedlyed connected with auxiliary jacking block (1), the other end of mandrel (3) radially slides with main jacking block (2) and is connected, the outer spring (4) that is with of each mandrel (3).
2. according to the described a kind of nuclear pressure vessel mother nut eddy current inspection probe clamper of claim 1, it is characterized in that: described bolt piece adopts the polyformaldehyde resin material to make, and mandrel (3) adopts oily bronze material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820182471U CN201378437Y (en) | 2008-12-31 | 2008-12-31 | Clamping and holding device for main nut eddy current check probe of nuclear pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820182471U CN201378437Y (en) | 2008-12-31 | 2008-12-31 | Clamping and holding device for main nut eddy current check probe of nuclear pressure vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378437Y true CN201378437Y (en) | 2010-01-06 |
Family
ID=41518553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200820182471U Expired - Lifetime CN201378437Y (en) | 2008-12-31 | 2008-12-31 | Clamping and holding device for main nut eddy current check probe of nuclear pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201378437Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107424658A (en) * | 2017-05-27 | 2017-12-01 | 苏州热工研究院有限公司 | A kind of flow probe apparatus for nuclear fuel rod EDDY CURRENT |
| CN107991382A (en) * | 2017-10-16 | 2018-05-04 | 中广核检测技术有限公司 | A kind of pipe vortex detection device |
| CN109975422A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of reactor pressure vessel bolt inner wall contact ultrasonic probe |
-
2008
- 2008-12-31 CN CN200820182471U patent/CN201378437Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107424658A (en) * | 2017-05-27 | 2017-12-01 | 苏州热工研究院有限公司 | A kind of flow probe apparatus for nuclear fuel rod EDDY CURRENT |
| CN107991382A (en) * | 2017-10-16 | 2018-05-04 | 中广核检测技术有限公司 | A kind of pipe vortex detection device |
| CN107991382B (en) * | 2017-10-16 | 2024-04-05 | 中广核检测技术有限公司 | Eddy current inspection device |
| CN109975422A (en) * | 2017-12-27 | 2019-07-05 | 核动力运行研究所 | A kind of reactor pressure vessel bolt inner wall contact ultrasonic probe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100106 |