CN1075631C - Device for nondestructive detecting flaws on conductor ball surface - Google Patents
Device for nondestructive detecting flaws on conductor ball surface Download PDFInfo
- Publication number
- CN1075631C CN1075631C CN 97120292 CN97120292A CN1075631C CN 1075631 C CN1075631 C CN 1075631C CN 97120292 CN97120292 CN 97120292 CN 97120292 A CN97120292 A CN 97120292A CN 1075631 C CN1075631 C CN 1075631C
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- ball
- coil
- eddy current
- conducting sphere
- current probe
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Abstract
The present invention relates to a non-destructive device for detecting flaws on a conductor ball surface, which is composed of coils, an eddy current probe and a support body, wherein the coils wind across a circular bracket; the support body is arranged in the coils; the detected conductor ball is arranged on the support body; the eddy current probe is arranged above the conductor ball. After alternate current is sent to the coils, the cavity of the circular bracket generates a rotary magnetic field to cause the conductor ball to rotate; in the eventually balanced state, the flaws move to the upper part of the ball; the eddy current probe can detect the damaged balls. The detection device has the advantages of simple structure, small volume, sensitive response and high reliability.
Description
The present invention relates to a kind of electromagnetic nondestructive device of conducting sphere surface imperfection, relate in particular to the damaged ball selecting device of high temperature gas cooled reactor fuel handling system, belong to technical field of nondestructive testing.
At present, in the damaged ball selecting device of pebble bed high temperature reactor, normally adopt the mechanical means sorting.Its method is, is processed with helicla flute at columniform cylinder surface, and cylinder becomes a pitch angle with horizontal line, settles a length straight fixed bar parallel with cylinder axis in a side of cylinder, and the distance between helicla flute bottom surface and the straight-bar surface is exactly a detector gap.Ball is between helicla flute and straight-bar, and along with the rotation of cylinder, under friction force and action of gravity, rotation edge, ball limit the helicla flute reach, and constantly changes axis of rotation orientation.Every almost can both contact with helicla flute bottom surface and straight-bar surface on the sphere, when the size of damaged ball will fall during less than detector gap, reaches sorting purposes.Intact ball still continues reach.In order to increase defective face and groove bottom and the chance that the bar surface contacts, reduce loss, the longer the better for helicla flute length.This characteristics with the damaged ball of mechanical means sorting are the ball of suitable sorting large-size defective (for example flat-top defective), its anti-external interference ability is strong, its weak point is that device volume is big, heavy, and is difficult to the damaged ball of little defectives such as sorting crack, depression.The sorting unit of this kind mechanical means is in the 88-89 page or leaf narration of document " high temperature gas cooled reactor " (high literary composition is write, and the Atomic Energy Press publishes November nineteen eighty-two).
The objective of the invention is at above-mentioned weak point, a kind of defect inspection method is provided, utilize electromagnetic field principle and mechanics principle, the conducting sphere surface imperfection is moved to the top or the bottom of spheroid rapidly, utilize fixed eddy current sensor to detect damaged ball then by moving.The ball equal energy fast detecting of this method to having defectives such as flat-top, crack, depression, its apparatus structure is simple, volume is little, response is sensitive, reliability is high.
The electromagnetic nondestructive device of a kind of conducting sphere surface imperfection of the present invention's design, it is made up of coil, eddy current probe and supporter.Coil is wrapped on the coil brace, coil brace is made of circular soft magnetic material, according to the time to coil importing sinusoidal alternating power supply, to in the circular coil support, produce magnetic field, and the mode that detected conducting sphere is rotated on supporter, detected conducting sphere is placed on the supporter, and eddy current probe places the conducting sphere top.
The electromagnetic nondestructive device of the conducting sphere surface imperfection of the present invention's design has following advantage:
1, can promptly navigate to the surface imperfection of conducting sphere the top or the bottom of ball.
2, can realize noncontact, harmless, detection automatically with the electromagnetic field eddy current method.
3, pick-up unit is simple in structure, volume is little, response is sensitive, reliability is high.
4, the present invention also extends in the production of industrial sector steel ball except that being used for pebble bed high temperature reactor, for example is used for the Non-Destructive Testing of bearing steel ball.
Description of drawings:
Fig. 1 is the structural representation of the pick-up unit that designs of the present invention.
Fig. 2-Fig. 4 is the defective synoptic diagram of conducting sphere among the use embodiment of pick-up unit of the present invention.
Below in conjunction with accompanying drawing, introduce content of the present invention in detail.Among Fig. 1, the 1st, detected conducting sphere, the 2nd, coil, the 3rd, circular coil support, the 4th, supporter, the 5th, eddy current probe.
Its course of work is: conducting sphere 1 is placed on the supporter 4, twines the coil 2 that can produce rotating magnetic field on the outside vertical ground of conducting sphere 1, and coil 2 is fixed on the circular soft magnetic material support.Directly over conducting sphere, fixed placement one eddy current probe 5 has a gap between probe 5 and the ball 1.After coil 2 is connected the sinusoidal alternating power supply, in the cavity of circular support, just there is rotating magnetic field to produce, thereby makes the conducting sphere rotation.Spheroid 1 final balance and stability state will make surface imperfection move to the top of ball 1.After the defect location, utilize the putting type eddy current probe 5 that is fixed on the defective top just can detect damaged ball again.
Embodiment:
The segment of the present invention's design falls into the cannot-harm-detection device, and coil 2 is selected copper conductor for use, support 3 material selection siliconized plates.Conducting sphere 1 is a graphite material, and the diameter of ball is 39.8mm, and eddy current probe 5 adopts the putting type coil, and its magnetic core is selected the soft magnetic material of high magnetic permeability for use.After coil 2 energized, the speed that produced in the cylindrical cavity is 25 revolutions per seconds rotating magnetic field.The present invention chooses three kinds of typical damaged balls and has done test experience, is described below respectively:
The crack ball.Fig. 2 is the synoptic diagram of crack ball, and the degree of depth h=5.9mm in crack stitches wide a=1.1mm, and the symmetrical plane in crack passes through the centre of sphere.Behind the coil switch power, randomly the crack ball is placed on the supporter, process is no more than 5 seconds time, and the crack just moves to the upper area of ball, just can finish damaged ball fast by eddy current testing device then and detect.
The flat-top ball.Fig. 3 is the synoptic diagram of flat-top ball, segment sagitta b=4.6mm.The flat-top ball is placed on the supporter, and then stone-dead if sagittal plane and supporting body surface overlap, this moment, defective was positioned at the lower area of ball, met positioning requirements; Except that this position, regardless of the initial position of spherical interior surface, through the motion that is no more than 4 seconds, segment all can move to the upper area of ball.After the defect location, eddy current testing device just can be finished detection rapidly.
The depression ball.Fig. 4 is the synoptic diagram of depression ball, the dark c=8.8mm that caves in, θ=50 °.Place the depression ball randomly, the result or the depression of motion are positioned at upper area, or depression is positioned at lower area, does not have other position.After the defect location, eddy current testing device just can be finished detection rapidly.
The conducting sphere that utilizes pick-up unit of the present invention to detect can all go out conductive material and form, and also only skin is formed by insulating material for the conductive material kernel.Eddy current probe can be a putting type, also can be through mode.Its probe coil form both can be an absolute type, also can be differential type.
Claims (1)
1, a kind of electromagnetic nondestructive device of conducting sphere surface imperfection is characterized in that this device is made up of coil, eddy current probe and supporter; Described coil is wrapped on the coil brace, coil brace is made of circular soft magnetic material, according to the time to coil importing sinusoidal alternating power supply, to in the circular coil support, produce magnetic field, and the mode that detected conducting sphere is rotated on supporter, detected conducting sphere is placed on the supporter, and detected conducting sphere is in the cavity that coil centers on, and eddy current probe places the conducting sphere top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120292 CN1075631C (en) | 1997-11-14 | 1997-11-14 | Device for nondestructive detecting flaws on conductor ball surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97120292 CN1075631C (en) | 1997-11-14 | 1997-11-14 | Device for nondestructive detecting flaws on conductor ball surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1184934A CN1184934A (en) | 1998-06-17 |
| CN1075631C true CN1075631C (en) | 2001-11-28 |
Family
ID=5175877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97120292 Expired - Fee Related CN1075631C (en) | 1997-11-14 | 1997-11-14 | Device for nondestructive detecting flaws on conductor ball surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1075631C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231267B (en) * | 2008-01-31 | 2010-12-22 | 华南理工大学 | Polyphase eddy detection system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006046578A1 (en) * | 2004-10-28 | 2006-05-04 | Toyo Kohan Co., Ltd. | Device and method for inspecting scratch on cell external case |
| CN112684000A (en) * | 2021-01-15 | 2021-04-20 | 中国工程物理研究院激光聚变研究中心 | Eddy current detection device suitable for ball-type subassembly |
-
1997
- 1997-11-14 CN CN 97120292 patent/CN1075631C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231267B (en) * | 2008-01-31 | 2010-12-22 | 华南理工大学 | Polyphase eddy detection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1184934A (en) | 1998-06-17 |
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| CF01 | Termination of patent right due to non-payment of annual fee |