CN2428844Y - Vortex fault-finding demagnetizer - Google Patents
Vortex fault-finding demagnetizer Download PDFInfo
- Publication number
- CN2428844Y CN2428844Y CN 00239025 CN00239025U CN2428844Y CN 2428844 Y CN2428844 Y CN 2428844Y CN 00239025 CN00239025 CN 00239025 CN 00239025 U CN00239025 U CN 00239025U CN 2428844 Y CN2428844 Y CN 2428844Y
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- demagnetization
- demagnetizer
- direct current
- power supply
- coil
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model belongs to the technical field of using magnetic method to analyze materials, and mainly relates to a demagnetizing treatment after the magnetic saturation method is used for carrying out vortex flaw detection to metal. The demagnetizing device is composed of a DC demagnetizer and an AC demagnetizer, wherein, the DC demagnetizer is composed of a DC demagnetizing coil and a DC power supply which is also composed of a transformer, a voltage regulator, a rectifying electric bridge, a smoothing capacitor and a protecting device; the AC demagnetizer is composed of an AC demagnetizing coil and an AC power supply which is also composed of a relay, an AC contactor and a proximity switch.
Description
The utility model belongs to the methods analyst material field with magnetic, relates generally to the demagnetization of ferromagnetic metal after the eddy current test of magnetic saturation method and handles.
The steel pipe of ferromagnetic metal material and rod iron are when carrying out automation eddy current test, in order to eliminate the influence of magnetic permeability skewness to detecting a flaw in the metal, must add a constant D.C. magnetic field and workpiece is magnetized promptly so-called saturation magnetization at the workpiece position of detecting a flaw.This flaw detection is also referred to as the eddy current test of magnetic saturation method.Have remanent magnetism through the workpiece after the eddy current test of magnetic saturation method, make troubles often for their following process and use, so now increasing smelter after steel pipe and rod iron are carried out eddy current test requirement to they processing of demagnetizing.
The demagnetizing method that adopts after the at present general eddy current test is the AC demagnetization method, it is to allow pass the wire coil that is connected with the 220V alternating current through the workpiece after the eddy current test, make the alternating magnetic field of in workpiece, inducting, under the effect in this magnetic field, original magnetic domain orientation changes according to the variation of external magnetic field in the metal, workpiece by and gradually in the process away from degaussion coil, the alternating magnetic field of inducting is more and more littler, finally reaches the purpose of demagnetization.Very limited through the demagnetization effectiveness after this method processing, particularly for thick walled steel tube and solid rod iron or bigger " Hard Magnetic " material pipe rod of remanent magnetism, situation is especially true, and its reason is:
(1) because AC magnetic field has " skin effect ", less when demagnetization object when being the rod iron of bigger steel pipe of wall thickness or solid in the magnetic field of workpiece induced inside, so that remanent magnetism moves back is unclean.
(2) when using alternating current method to demagnetize, the electric current that feeds in the degaussion coil is big more, and demagnetization effectiveness is good more; And pass to big electric current for a long time, then degaussion coil can generate heat, even burns coil.This is a pair of contradiction.AC demagnetization device in usefulness all adopts continuous step mode at present, and for avoiding the magnetic coil heating with the 220V voltage feed, the power supply in the coil is less, and this also is a factor that influences demagnetization effectiveness.
The eddy current test demagnetizer that provides a kind of demagnetization effectiveness good is provided the purpose of this utility model.Mainly be applicable to the demagnetization processing after the eddy current test of magnetic saturation method of ferromagnetic metal tubing and bar.
At above-mentioned purpose, the demagnetizing method that the utility model eddy current test adopts direct current demagnetization and the two methods of AC demagnetization to develop simultaneously with demagnetizer.This demagnetizer is made up of direct current demagnetization device and AC demagnetization device.Both are adjacent on the parallel same horizontal plane that is assemblied in the full device rear portion of magnetic on the automatic flaw detection production line.The direct current demagnetization device is preceding, the AC demagnetization device after, the magnetic saturation device is conventional workpiece magnetizing device, it is characterized by hollow, cylindrical structure, its characteristic is the steady magnetic field that can provide an orientation.The direct current demagnetization device is made up of direct current demagnetization coil and DC power supply; The AC demagnetization device is made up of AC demagnetization coil and AC power.Magnetic saturation device, direct current demagnetization device and AC demagnetization device are the cylindrical shape of hollow; Three's cylinder axis unanimity is convenient to passing through of processed metal pipe material and bar.
Now the utility model is described in further detail in conjunction with the accompanying drawings.
Accompanying drawing 1 is the structural representation of the utility model eddy current test with demagnetizer.
Accompanying drawing 2 is the circuit theory schematic diagram of direct current demagnetization device.
Accompanying drawing 3 is the circuit theory schematic diagram of AC demagnetization device.
Find out that by above-mentioned accompanying drawing 1,2 and 3 the utility model eddy current test is made up of direct current demagnetization device 2 and AC demagnetization 3 with demagnetizer.Direct current demagnetization device 2 is made up of direct current demagnetization coil 7 and DC power supply 8, and both link to each other by lead; And DC power supply 8 is made up of transformer DR, voltage regulator T, rectifier bridge DB, filter capacitor C, protector Z1 and Z2 and K switch 1, and joins by node A, O and 220V power supply.
AC demagnetization device 3 is made up of AC demagnetization coil 9 and AC power 10, and both link to each other by lead; AC power 10 by relay ZJ1 and ZJ2, A.C. contactor CJ, open K2 near switch S J1 and SJ2, power supply and form, they constitute a logical "or" circuit, the feed process of control alternating current, this AC power 10 is joined by node B, C and 380V power supply.
Two are placed in the two ends of AC demagnetization coil respectively near switch 6, one of entrance point, and one of the port of export, as shown in Figure 1.The feed process of the logical "or" of AC demagnetization power supply is: if near have among switch S J1 and the SJ2 one/or two whiles triggered by workpiece, the relay ZJ1 that is in series with it is or/and the ZJ2 startup, normal adhesive battle, afterwards drive A.C. contactor CJ closure, three-phase alternating-current supply begins to the AC demagnetization coil power supply, the feed process of logical "or" that Here it is, switch on when realizing workpiece thus by the AC demagnetization coil, workpiece leaves the back coil blackout, so just shorten conduction time, avoided coil heating.
Above-mentioned magnetic saturation device 1, direct current demagnetization device 2 and AC demagnetization device 3 are hollow circle tube, three's cylinder axis unanimity, and they are adjacent to be assemblied on the same horizontal plane of demagnetization production line, are convenient to processed tubing and bar and pass through smoothly.
Above-mentioned direct current demagnetization coil 7 and AC demagnetization coil 9 all form with the enamelled wire coiling; The skeleton of the winding around that direct current demagnetization coil 7 is adopted and shell thereof are by non-ferromagnetic metal or nonmetal making; And the skeleton of the winding around that AC demagnetization coil 9 is adopted and shell must be made with nonmetal.
In the accompanying drawing 1,2,3,1 is the magnetic saturation device, and 6 is near switch, and 4 is processed workpiece, and 5 is the transmission roller channel of workpiece, and 12 is transfer roller, and is a DC ammeter,
Be alternating current ammeter, O is a zero line, and A, B, C are phase line, and Z3, Z4 are protector.
The utility model eddy current test is as follows with the course of work of demagnetizer:
Metal pipe material or bar are after 1 flaw detection of magnetic saturation device, at first enter direct current demagnetization device 2 and carry out direct current demagnetization, the magnetic direction of the direct current demagnetization magnetic coil 7 in the direct current demagnetization 2 is opposite with the magnetizing field direction of magnetic saturation device 1, in order to offset (comprising inside and surface) most remanent magnetism in the workpiece, enter AC demagnetization device 3 again through the workpiece after the direct current demagnetization processing of direct current demagnetization device 2 and carry out AC demagnetization, eliminate remaining remanent magnetism, reach the magnetic of final elimination workpiece.
Compared with prior art, the utlity model has following advantage:
(1) direct current demagnetization does not have " Kelvin effect ", can offset the residual magnetic field of inside workpiece, has remedied existing The deficiency that single AC demagnetization is arranged;
(2) the 380V high-voltage feedback power is adopted in AC demagnetization, strengthens demagnetizing field intensity, continues owing to adopting simultaneously Step mode is avoided coil heating.
(3) the utlity model has good demagnetization effectiveness, through in ten many enterprises, using checking, it can make the steel pipe of most of carbon steel and steel alloy material and rod iron through demagnetization handle surplus less than 8Gs (can not adsorb a pin), this is to adopt single AC demagnetization method institute inaccessiable.
Claims (4)
1, a kind of eddy current test demagnetizer is characterized in that:
[1], this device is made up of direct current demagnetization device (2) and AC demagnetization device (3);
[2], direct current demagnetization device (2) is made up of direct current demagnetization coil (7) and DC power supply (8); Both link to each other by lead;
[3], DC power supply (8) by transformer (DR), voltage regulator (T), rectifier bridge (DB), filter capacitor (C), protector (Z1) and (Z2) and switch (K1) form, join by node (A, O) and 220V power supply;
[4], AC demagnetization device (3) is made up of AC demagnetization coil (9) and AC power (10); Both link to each other by lead;
[5], AC power (10) by relay (ZJ1) and (ZJ2), A.C. contactor (CJ), near switch (SJ1) and (SJ2), mains switch (K2) forms; This AC power (10) is joined by node (B, C) and 380V power supply.
2, demagnetizer according to claim 1 is characterized in that direct current demagnetization device (2) and AC demagnetization device (3) are the cylindrical shape of hollow, and both are consistent with magnetic saturation device (1) cylinder axis.
3, demagnetizer according to claim 1 is characterized in that magnetic saturation device (1), direct current demagnetization device (2) and AC demagnetization device (3) are adjacent to be assemblied on the same horizontal plane.
4, demagnetizer according to claim 1 is characterized in that the magnetic direction of direct current demagnetization device (2) is opposite with the magnetizing field direction of magnetic saturation device (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239025 CN2428844Y (en) | 2000-06-15 | 2000-06-15 | Vortex fault-finding demagnetizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00239025 CN2428844Y (en) | 2000-06-15 | 2000-06-15 | Vortex fault-finding demagnetizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2428844Y true CN2428844Y (en) | 2001-05-02 |
Family
ID=33599960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00239025 Expired - Fee Related CN2428844Y (en) | 2000-06-15 | 2000-06-15 | Vortex fault-finding demagnetizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2428844Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177846A (en) * | 2013-04-03 | 2013-06-26 | 北京北方车辆集团有限公司 | Demagnetization device used for oversized workpiece |
| CN108247539A (en) * | 2017-12-30 | 2018-07-06 | 襄阳福坦铁路轴承有限公司 | A kind of magnetising or demagnetising apparatus of grinding machine |
| CN112271055A (en) * | 2020-09-27 | 2021-01-26 | 上海射磁探伤机制造有限公司 | Full-tube pulse demagnetization device and method |
-
2000
- 2000-06-15 CN CN 00239025 patent/CN2428844Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103177846A (en) * | 2013-04-03 | 2013-06-26 | 北京北方车辆集团有限公司 | Demagnetization device used for oversized workpiece |
| CN108247539A (en) * | 2017-12-30 | 2018-07-06 | 襄阳福坦铁路轴承有限公司 | A kind of magnetising or demagnetising apparatus of grinding machine |
| CN108247539B (en) * | 2017-12-30 | 2023-10-20 | 襄阳一福坦铁路轴承有限公司 | Magnetizing and demagnetizing device of grinding machine |
| CN112271055A (en) * | 2020-09-27 | 2021-01-26 | 上海射磁探伤机制造有限公司 | Full-tube pulse demagnetization device and method |
| CN112271055B (en) * | 2020-09-27 | 2022-08-09 | 上海射磁探伤机制造有限公司 | Full-tube pulse demagnetization device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |