CN102854241B - Be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection - Google Patents
Be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection Download PDFInfo
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- CN102854241B CN102854241B CN201210332424.9A CN201210332424A CN102854241B CN 102854241 B CN102854241 B CN 102854241B CN 201210332424 A CN201210332424 A CN 201210332424A CN 102854241 B CN102854241 B CN 102854241B
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Abstract
The invention discloses the axial magnetized device being suitable for steel pipe short dead zone transverse defect high speed detection, comprise coil magnetizing device and probe, magnetizing apparatus is single magnetizing coil; Also comprise the poly-magnetic annulus be made up of magnetic material; The distance that poly-magnetic annulus and magnetizing coil interval set and coaxial with magnetizing coil; Poly-magnetic annulus is connected to magnetizing coil by the magnetic circuit formed with magnetic material; Probe is between magnetizing coil and poly-magnetic annulus.The present invention adopts single coil magnetizing device and field shaper to replace existing twin coil magnetizing apparatus in steel pipe transverse defect high speed detecting equipment, can improve the defect that twin coil magnetizing apparatus check frequency is longer significantly, makes horizontal check frequency length be no more than 200mm.
Description
Technical field
The present invention relates to the steel pipe magnetic inspection in technical field of nondestructive testing, particularly relate to a kind of axial magnetized device being suitable for steel pipe short dead zone transverse defect and detecting, its steel pipe magnetic detection on steel pipe rolling line, processing line.
Background technology
In steel pipe magnetic high speed detecting equipment on existing steel pipe rolling line, processing line, the axial magnetized device of steel pipe transverse defects detection part adopts twin coil magnetizing apparatus usually.With twin coil magnetizing apparatus, axial magnetized is carried out with the various cross direction profiles defects on examination steel tube wall to the steel pipe passed through.Steel pipe is when at a high speed by twin coil magnetizing assembly, and owing to affecting the magnetic medium in twin coil magnetizing apparatus and electrical characteristic parameter, cause the disturbance to magnetic field in steel tube head magnetic history, thus there is longer horizontal check frequency, its main cause is as follows:
(1) when steel tube head passes first magnetizing coil of twin coil magnetizing apparatus, be iron core because magnetizing coil adds steel pipe, cause its impedance to increase, the magnetization circuit electric current under constant voltage dc source effect diminishes, magnetizing coil field weakening, causes steel tube head to magnetize not enough;
(2) steel tube head is through the linear transducer array twin coil magnetizing apparatus, forms strong disturbance, flood the transverse defect signal of steel tube head due in the sensor that the magnetic field of first magnetizing coil changes rapidly in probe;
(3) meanwhile, form continuously strong disturbance in the sensor of the fringe magnetic field that steel tube head is formed also in probe, flood the transverse defect signal of steel tube head;
(4) when steel tube head passes second magnetizing coil of twin coil magnetizing apparatus, be iron core because magnetizing coil adds steel pipe, cause its impedance to increase, the magnetization circuit electric current under constant voltage dc source effect diminishes, magnetizing coil field weakening, causes steel tube head to magnetize not enough;
(5) until steel tube head is all by after second magnetizing coil, magnetizing coil impedance could be constant, and magnetization circuit electric current is stablized constant gradually, and the disturbance in magnetic field just terminates, and result forms the horizontal check frequency in termination of longer distance.
In up-to-date international standard ISO10893-3 " it is all-round to automatic Magnetic Flux Leakage Inspecting that ferromagnetism weldless steel tube and welded tube (except submerged arc welding) vertical and horizontal lack ", all cannot specify the size of the horizontal check frequency in steel pipe two ends.In fact, the horizontal check frequency length that steel pipe magnetic high speed detecting equipment is formed at steel tube head can reach 300-500mm; The horizontal check frequency in each termination of steel pipe is recommended to be 300mm in China standard GB/T/T25757-2010 " steel pipe automatic Magnetic Flux Leakage Testing System all-round property testing method ".And the checkout equipment of existing employing twin coil magnetizing apparatus is difficult to this recommendation of being up to state standards.
In theory, the existence of the horizontal check frequency of steel tube head is unavoidable, therefore only has the blind area of as far as possible shortening in actual detection, to increase the reliability of detection, thus greatly improves the safety in utilization of steel pipe.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of axial magnetized device being suitable for steel pipe short dead zone transverse defect high speed detection.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the axial magnetized device being suitable for steel pipe short dead zone transverse defect high speed detection, comprises coil magnetizing device and probe, and magnetizing apparatus is single magnetizing coil; Axial magnetized device also comprises the poly-magnetic annulus be made up of magnetic material; The distance that poly-magnetic annulus and magnetizing coil interval set and coaxial with magnetizing coil; Poly-magnetic annulus is connected to magnetizing coil by the magnetic circuit formed with magnetic material; Probe is between magnetizing coil and poly-magnetic annulus.
As preferably, also comprise coil brace, base plate, supporting pillar, described coil brace, base plate, supporting pillar are made by magnetic material; Magnetizing coil is fixed on coil brace, and poly-magnetic annulus is fixed on supporting pillar upper end, and supporting pillar lower end is fixed on base plate; Coil brace, base plate, supporting pillar form the magnetic circuit being connected to poly-magnetic annulus by magnetizing coil.
As preferably, pop one's head near poly-magnetic annulus.
As preferably, probe is 50 ~ 100mm with the distance of horizontal poly-magnetic magnetic pole.
As preferably, the internal diameter of magnetizing coil is provided with the annulus that magnetic material is made, and makes magnetizing coil become the magnetizing coil of ribbon core.
As preferably, poly-magnetic annulus is made up of the donut of multilayer, and the sheet material be made up of magnetic material of donut is end to end to be formed, and each layer donut embeds the overall donut of formation one from outside to inside mutually according to respective radius size.
As preferably, also comprise probe holder; Probe is arranged on probe holder; Probe holder is ring support, probe circumferentially circumferential array on a toroidal support, pop one's head in the circle diameter that arranges and tested diameter of steel tube suitable.
As preferably, probe holder comprises long probe arm and short probe arm, and probe is arranged on the front end of long probe arm and the front end of short probe arm respectively, and the rear end of long probe arm and short probe arm to be fixed on probe holder and to make array with interlaced form and arranges.
As preferably, also comprise frame, chute and guide rail, chute is fixed on the top of frame, and guide rail is fixed on the bottom of frame; Probe holder inserts in the space of chute and guide rail formation; Probe holder can be changed by pull in chute and guide rail.
As preferably, magnetic material is soft iron magnetic material.
Principle of work of the present invention:
1, twin coil magnetizing apparatus forms the principle of longer check frequency:
Each self-impedance of two air core coil magnetizing apparatus is Z=R+j ω L, and when passing through Constant Direct Current, when being in stable state, the impedance of magnetizing apparatus is Z=R.During steel tube head passes through at a high speed the transient process of first magnetizing coil, coil magnetizing device becomes part iron-core coil from air core coil, its impedance is Z=R+j ω (L+ Δ L)=R+j ω L+j ω Δ L, which increase the impedance of magnetization circuit, during making transient process, magnetization circuit electric current reduces, coil magnetic field weakens, not enough to steel tube head magnetization, causes defect undetected;
During steel tube head passes through at a high speed the transient process of second magnetizing coil, still there will be above situation, until steel tube head is terminated by the transient process of these two groups of magnetizing coils, enter between steady state period, the impedance of magnetizing apparatus is Z=R, enters the normal body detected state time.
Steel pipe from passing through first magnetizing coil at a high speed, and then is terminated by transient process after second magnetizing coil at a high speed, and steel tube head all can be caused during this to magnetize not enough, defect is undetected, forms longer check frequency.
2, axial magnetized device of the present invention reduces the principle of check frequency:
First axial magnetized device of the present invention adopts single magnetizing coil, and set up high magnetic property ferromagnetism annulus therein, High-speed Steel Tube can be allowed to pass through on the one hand, make coil be iron-core coil simultaneously, steel tube head by time the j ω Δ L that causes change relatively little, thus shorten settling time;
Axial magnetized device of the present invention have employed laterally poly-magnetic magnetic pole and replaces second magnetizing coil, eliminate second magnetizing coil transient process on the one hand, when steel tube head arrives poly-magnetic magnetic pole simultaneously, the fringe magnetic field of steel tube head is bound in steel pipe walls, reduce the interference that fringe magnetic field is formed in probe, be convenient to the detection to steel tube head defect;
The coil brace of axial magnetized device of the present invention, laterally poly-magnetic magnetic pole, supporting pillar, base plate are made by magnetic material, and are interconnected to constitute low reluctance magnetic circuit, reduce magnetization cycle magnetic resistance, improve magnetization efficiency.
Axial magnetized device of the present invention will be popped one's head between magnetizing coil and poly-magnetic annulus also near poly-magnetic annulus, during High-speed Steel Tube passes through the transient process of first magnetizing coil, probe is got along well steel pipe contact completely, and the magnetic field that can not form coil changes rapidly in the sensor in probe and forms strong disturbance; When steel pipe arrives probe area, arrive poly-magnetic annulus soon, transient process terminates, and enters between steady state period.This axial magnetized device is the width value that ultimate range (50-100mm) between probe and poly-magnetic annulus adds magnetism gathering rings to the check frequency that the whole testing processes of termination are formed, and this check frequency can not be greater than 200mm.
The invention has the beneficial effects as follows:
In the axial magnetized device of the transverse defect detecting portion of High-speed Steel Tube checkout equipment, adopt unicoil magnetizing apparatus and magnetism gathering rings to replace existing twin coil magnetizing apparatus, the defect that twin coil magnetizing apparatus check frequency is longer can be improved significantly, the check frequency of the transverse defect detecting portion of High-speed Steel Tube checkout equipment is made to be no more than 200mm (this value is less than national standard recommendation 300mm), thus reach and be better than the recommendation about horizontal blind area, termination in standard GB/T/T25757-2010 " steel pipe automatic Magnetic Flux Leakage Testing System all-round property testing method " and national ferrous metal industry standard YB/T4083 " automatic eddy current apparatus for steel pipe inspection all-round property testing method ", add the reliability to Tube heating furnace, improve the safety in utilization of steel pipe.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the structural representation that the present invention is suitable for the axial magnetized device embodiment of steel pipe short dead zone transverse defect high speed detection.
Fig. 2 is the structure cut-open view that the present invention is suitable for the axial magnetized device embodiment of steel pipe short dead zone transverse defect high speed detection.
Fig. 3 is the poly-magnetic circular ring structure schematic diagram that the present invention is suitable for the axial magnetized device embodiment of steel pipe short dead zone transverse defect high speed detection.
In figure, 1-base plate, 2-right angle seat, 3-magnetizing coil, 4-line card, 5-coil mounting plate, 6-annulus, 7-pops one's head in slide plate, 8-sleeve pipe, 9-bolt, 10-upper hopper chute, 11-pops one's head in, 12-probe arm, 13-is poly-magnetic magnetic pole laterally, and 1301-gathers magnetic annulus, 1302-supporting pillar, 1303-base, 14-hangers, 15-pulley, 16-guide rail, 17-steel pipe.
Embodiment
The present embodiment is the axial magnetized device being suitable for steel pipe short dead zone transverse defect high speed detection.It is for steel pipe rolling line, processing line.
In Fig. 1, the axial magnetized device being suitable for steel pipe short dead zone transverse defect high speed detection is made up of base plate, magnetizing apparatus, laterally poly-magnetic magnetic pole and probe.
Magnetizing apparatus is single magnetizing coil 3, and magnetizing coil 34 line cards 4 are fixed on the coil mounting plate 5 that soft iron magnetic material makes, and coil mounting plate 5 is fixed on base plate 1 by right angle seat 2.
During for reducing tested steel tube head through independently magnetizing coil, causing magnetizing apparatus inductive impedance to change, the impact that magnetization current diminishes, being also provided with the annulus 6 made with soft iron magnetic material in magnetizing coil 3 central authorities, becoming the magnetizing coil of ribbon core.
As poly-magnetic mechanism, laterally poly-magnetic magnetic pole 13 is made up of poly-magnetic annulus 1301, supporting pillar 1302, base 1303, is all make with soft iron magnetic material.Laterally the base 1303 of poly-magnetic magnetic pole 13 is fixed on base plate 1, and during installation, the distance that poly-magnetic annulus 1301 and magnetizing coil 3 interval set, central shaft and the magnetizing coil 3 of poly-magnetic annulus 1301 are same central shaft.
For the steel pipe of applicable detection different tube diameters, poly-magnetic annulus 1301 is made up of the donut of multilayer, and the sheet material be made up of soft iron magnetic material of each annulus is end to end to be formed, and each layer donut is stacked successively by radius and embedding one-tenth overall annulus.This structure is convenient to when detecting the steel pipe of different tube diameters, is embedded in middle annulus, can detects the steel pipe that caliber is larger as long as pull down.
Poly-magnetic annulus 1301 is by supporting pillar 1302 and base 1303, then the base plate 1 made by soft iron magnetic material, coil mounting plate 5 are communicated with the magnetic circuit of magnetizing coil 3.
Between magnetizing coil 3 and poly-magnetic annulus 1301, be provided with 8 pop one's head in 11.
8 probes 11 are arranged on the front end of 8 probe arms 12 respectively, and probe arm is arranged on probe slide plate 7.Be provided with the circular hole being suitable for tested steel pipe and passing through in the middle of probe slide plate 7, Circularhole diameter is with suitable with tested steel pipe caliber.8 probe arms 12 are respectively 4 long probe arms and 4 short probe arms, long probe arm and short probe arm are that array arranges popping one's head on slide plate, namely long-armed probe and the galianconism circumference of popping one's head in along circular hole is in being staggered, ensure that probe is to the covering completely of radial a week of tested steel pipe, greatly reduces loss.
Consider that Test Field often needs to detect the steel pipe of different tube diameters, probe slide plate have employed the drawing and pulling type structure being convenient to change.Be about to probe slide plate 7 be arranged between upper hopper chute 10 and guide rail 16.Wherein, upper hopper chute 10 is connected with the bolt 9 of coil mounting plate 5 top through sleeve pipe 8, and guide rail 16 is fixed on the base plate 1 below upper hopper chute.
The bottom of probe slide plate 7 is provided with hangers 14, is provided with pulley 15 in hangers, and slide plate of popping one's head in like this can be changed by rapid pull by pulley in chute and guide rail, to adapt to the steel pipe detecting different tube diameters.
Probe slide plate 7 is at magnetizing coil 3 and laterally between poly-magnetic magnetic pole 13, when the termination of steel pipe 17 reaches in poly-magnetic annulus 1301, the fringe magnetic field of steel tube end part converges on poly-magnetic annulus 1301 by termination, magnetic field is concentrated in the tube wall of steel pipe 17, the disturbance that the fringe magnetic field reducing steel tube end part is formed in probe.
In order to shorten the disturbance that steel tube end part fringe magnetic field is formed in probe further, slide plate 7 of popping one's head in is as far as possible near poly-magnetic annulus 1301, and in the present embodiment, probe slide plate 7 is 80mm apart from poly-magnetic annulus.
In the present embodiment, the width of poly-magnetic annulus 1301 is 50mm.Therefore the length of check frequency is 130mm.
The present embodiment adopts high-power stabilization Constant charge soil magnetizing system, by applying steady magnetic field to the tested steel pipe passed through at a high speed, in the stray field of its outside surface pickup defect refraction, reliably can detect the inside and outside surface of body and inherent vice.The transverse groove wound for long × wide × dark=12.5mm × 1mm × 0.5mm of steel duct can be detected in practice.The present embodiment has very high detection sensitivity and reliability to the various defect of steel pipe inside and outside wall and inside.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.
Claims (10)
1. be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection, comprise coil magnetizing device and probe, it is characterized in that: described magnetizing apparatus is single magnetizing coil; Described axial magnetized device also comprises the poly-magnetic annulus be made up of magnetic material; The distance that described poly-magnetic annulus and magnetizing coil interval set and coaxial with magnetizing coil: described poly-magnetic annulus is connected to magnetizing coil by the magnetic circuit formed with magnetic material: described probe is between magnetizing coil and poly-magnetic annulus.
2. axial magnetized device according to claim 1, it is characterized in that: also comprise coil brace, base plate, supporting pillar, described coil brace, base plate, supporting pillar are made by magnetic material; Described magnetizing coil is fixed on coil brace, and described poly-magnetic annulus week fixes on supporting pillar upper end, and supporting pillar lower end is fixed on base plate; Described coil brace, base plate, supporting pillar form the magnetic circuit being connected to poly-magnetic annulus by magnetizing coil.
3. axial magnetized device according to claim 1, is characterized in that: described probe is near poly-magnetic annulus.
4. axial magnetized device according to claim 1, is characterized in that: described probe is 50 ~ 100mm with the distance of horizontal poly-magnetic magnetic pole.
5. axial magnetized device according to claim 1, is characterized in that: the internal diameter of described magnetizing coil is provided with the annulus that magnetic material is made, and makes magnetizing coil become the magnetizing coil of ribbon core.
6. axial magnetized device according to claim 1, it is characterized in that: described poly-magnetic annulus is made up of the donut of multilayer, the sheet material be made up of magnetic material of described annulus is end to end to be formed, and each layer donut embeds the overall donut of formation one from outside to inside mutually according to respective radius size.
7. axial magnetized device according to claim 1, is characterized in that: also comprise probe holder; Described probe is arranged on probe holder; Described probe holder is ring support, described probe circumferentially circumferential array on a toroidal support, pop one's head in the circle diameter that arranges and tested diameter of steel tube suitable.
8. axial magnetized device according to claim 7, it is characterized in that: described probe holder comprises long probe arm and short probe arm, described probe is arranged on the front end of long probe arm and the front end of short probe arm respectively, and the rear end of described long probe arm and short probe arm to be fixed on probe holder and to make array with interlaced form and arranges.
9. axial magnetized device according to claim 8, it is characterized in that: also comprise frame, chute and guide rail, described chute is fixed on the top of frame, and described guide rail is fixed on the bottom of frame; Described probe holder inserts in the space of chute and guide rail formation; Probe holder can be changed by pull in chute and guide rail.
10., according to the axial magnetized device of claim 1-9 described in any one, it is characterized in that: described magnetic material is soft iron magnetic material.
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| CN201210332424.9A CN102854241B (en) | 2012-09-09 | 2012-09-09 | Be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection |
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| CN201210332424.9A CN102854241B (en) | 2012-09-09 | 2012-09-09 | Be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection |
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| DE102011003703A1 (en) * | 2011-02-07 | 2012-08-09 | Schaeffler Technologies Gmbh & Co. Kg | Measuring device for determining an operating state variable of a rotating component, in particular a bearing |
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|---|---|---|---|---|
| CN1089033A (en) * | 1992-12-30 | 1994-07-06 | 华中理工大学 | The apparatus and method of detection by quantitative defect in slender magnetic-conductive component |
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