CN2115539U

CN2115539U - Modulation permanent-magnet flaw detector

Info

Publication number: CN2115539U
Application number: CN 91228829
Authority: CN
Inventors: 陈宁; 钟宝申; 赵能平
Original assignee: FUSHUN RARE-EARTH MAGNETIC MATERIAL FACTORY
Current assignee: FUSHUN RARE-EARTH MAGNETIC MATERIAL FACTORY
Priority date: 1991-11-21
Filing date: 1991-11-21
Publication date: 1992-09-09

Abstract

The utility model relates to a modulation permanent-magnet flaw detector for non-destructive flaw detection. The utility model is composed of a magnetic rotary shaft whose magnetic conducting part center is provided with two soft irons holding an Nd-Fe-B permanent magnet and two magnetic poles which are connected with both ends of the magnetic conducting part. Each magnetic pole is an oblique column rotary variable distance structure or a roller type three contacts structure, and thus, the utility model can make the variable distance detection or the staggered type flaw detection. The utility model has reasonable design and excellent performance. The magnetic field intensity can be adjusted selectively, the stable, constant generated magnetic field can make the crack detection with the residual magnetic method and the continuous method. The modulation permanent-magnet flaw detector is a quite ideal magnetic powder flaw detection device with the non-destructive detection.

Description

Modulation permanent-magnet flaw detector

The utility model belongs to nondestructive examination detection technique field, is specifically related to a kind of Non-Destructive Testing magnetic powder inspection equipment.

At present, the magnetic powder inspection checkout equipment considers to make electricity consumption excitation method produce enough probing surface magnetic field.Defectoscope must be equipped with a cover power rectifier converting means for this reason, so just defines being extensive use of of this instrument objectively.Also give simultaneously and keep in repair, use, carry and operation is made troubles.Above-mentioned carrying out flaw detection equipment structurally generally adopts the movable displacement of radial type to survey cartridge, because of loose contact, has bigger leakage field phenomenon.In addition, partly magnaflux use permanent magnet is arranged also, but, some fatal defectives occurred because material is selected and structural design is unreasonable.Not high enough as the magnetic field intensity that produces; Magnetic field intensity can not regulate and select, and causes its useful work magnetic field intensity low, is adsorbed on surface of the work unloading inconvenience, influences the track part that crackle demonstrates, and has damaged the sensitivity of flaw detection.

The purpose of this utility model is a kind of modulation system permanent magnetism defectoscope of development, to solve above shortcomings in the prior art.

Fig. 1 installs the structural representation of two contact magnetic poles for the utility model;

Fig. 2 installs the structural representation of three contact magnetic poles for the utility model.

The utility model is by magnetic rotating shaft 1, magnetic conductance part 2, cartridge interface 3, magnetic pole 4, rear exhausted magnetic fixed head 7, fine setting part 8, and neodymium iron boron permanent magnet 9 consists of. Magnetic rotating shaft 1 consists of smooth Cylinder by two soft irons, 10 clamping neodymium iron boron permanent magnets 9, be positioned at the centre of the magnetic conductance part 2 that is become by two halves hole shape soft iron yoke piece, two soft iron yokes engage by non-magnetic rear exhausted magnetic fixed head 7 and fine setting part 8, with fine setting part 8 controls two yoke spacings with the rotation that guarantees magnetic rotating shaft 1 freely. Two magnetic pole 4 usefulness cartridge interfaces 3 are fixed with magnetic conductance part 2 two ends.

Magnetic rotating shaft 1 is by two soft irons, 10 clamping Nd-Fe-B permanent magnets, and its two soft iron 10 plays magnetic conduction and auxiliary magnetic pole effect, regulates magnetic flux by rotation and can arbitrarily be assigned to the work utmost point, and magnet is retained in magnetostatic state always.Magnetic rotating shaft 1 top is magnetic field display 11, and the bottom is for tightening up supporting plate 12, and is all fixing with bolt 6, and reason is stressed and misplace to guarantee magnetic rotating shaft 1, can seal and show the magnetic field assigned degree simultaneously.The bolt 6 on magnetic rotating shaft 1 top also can be done handle usefulness is installed.

Magnetic conductance part 2 is joined with non-magnet materials such as aluminium, rubber between fine setting part 8 places that connect magnetic rotating shaft 1.Magnetic fixed head 7 is cut off with aluminium, partition and magnetic conductance part 2 herein in succession in the back.

Cartridge interface 3 adopts the semifixed magnetic pole of circlip type, guarantees that under no magnetic state, magnetic pole does not break away from yoke, when magnetizing, and magnetic pole and yoke close proximity.

Magnetic pole 4 works the workpiece contact effect of surveying.For reaching the good purpose of conversion two die opening magnetic conductions, magnetic pole 4 can adopt two batter post rotation displacement structures (as Fig. 1).The upper and lower utmost point contact of displacement process is good.Survey (as the weld seam detection of fillet weld, axle and pipe fitting) for adapting to various baroque surface of the works, cartridge annex 5 is equipped with in magnetic pole 4 bottoms of two batter post rotation displacements, and the embedded Nd-Fe-B permanent magnet 9 of these annex 5 abutment surface engages with magnetic pole 4.Magnetic pole 4 also can adopt three structure of contact terminals (as Fig. 2) of band roller 13, promptly a cartridge is single contact, another cartridge is two contacts, single contact of preceding cartridge is to two contact lines of back cartridge, the angle that is become is the right angle, by the moving of surface of the work, relies on the vector in the formed quadrature of this three contact (vertically) magnetic field to synthesize, can to produce different direction magnetic field through the zone, can carry out disposable staggered form flaw detection to the weld seam that is detected.

The utility model is reasonable in design, and is cheap, excellent performance.Can select to regulate magnetic field intensity, its magnetic field intensity can be adjusted to maximum continuously by zero, and the steady magnetic field that is produced can carry out residaul field method, continuity method crack detection.The utility model will provide the reliable detection means to the detection and the maintenance of various types of metallic structural components.It is present comparatively desirable Non-Destructive Testing magnetic powder inspection equipment.

Claims

1, a kind of modulation system permanent magnetism defectoscope, comprise magnetic conductance part 2, cartridge interface 3, magnetic pole 4, it is characterized in that magnetic rotating shaft 1 constitutes smooth Cylinder by two soft irons, 10 clamping Nd-Fe-B permanent magnets 9, be positioned at the centre of the magnetic conductance part 2 of two halves hole shape soft iron yoke piece one-tenth, two soft iron yokes engage by the back exhausted magnetic fixed head 7 and the fine setting part 8 of non-magnetic conduction, with fine setting part 8 controls two yoke spacings with the rotation that guarantees the magnetic rotating shaft freely; Two magnetic pole 4 usefulness cartridge interfaces 3 have exhausted magnetic fixed head 7 with magnetic conductance part 2 back; Two magnetic pole 4 usefulness cartridge interfaces 3 are fixed with magnetic conductance part 2 two ends.

2, modulation system permanent magnetism defectoscope according to claim 1 is characterized in that magnetic pole 4 adopts batter post rotation displacement structure.

3, modulation system permanent magnetism defectoscope according to claim 1 is characterized in that magnetic pole 4 adopts three contact structures of band roller 13, and promptly a cartridge is single contact, and another cartridge is two contacts.

4, modulation system permanent magnetism defectoscope according to claim 2 is characterized in that magnetic pole 4 bottoms are equipped with cartridge annex 5.