CN201285386Y - Magnetic powder defect detecting magnifying apparatus - Google Patents
Magnetic powder defect detecting magnifying apparatus Download PDFInfo
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- CN201285386Y CN201285386Y CNU2008201783225U CN200820178322U CN201285386Y CN 201285386 Y CN201285386 Y CN 201285386Y CN U2008201783225 U CNU2008201783225 U CN U2008201783225U CN 200820178322 U CN200820178322 U CN 200820178322U CN 201285386 Y CN201285386 Y CN 201285386Y
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- shaped current
- current coil
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Abstract
The utility model relates to a magnetic particle flaw detection magnetizer which comprises Y-shaped current coils distributed on both end surfaces of a detected workpiece, wherein the Y-shaped current coils is in a double-surface containing shape with respect to the detected workpiece; the Y-shaped current coils in the position of the end surface of the detected workpiece comprise a plurality of conductor lines, the center of the conductor lines is in an outward radiation shape; the Y-shaped current coils on the left end surface and the right end surface are respectively fixed on two fixing seats of flaw detection equipment; the two fixing seats can relatively move; the Y-shaped current coils on the left end surface and the right end surface are connected through a wire connecting terminal which can be opened and closed. When the wire connecting terminal is closed, the Y-shaped current coils are connected into a current passage. The utility model overcomes the defects of a rod penetration method for detecting large annular workpieces, disk-shaped workpieces or hollow workpieces, has ideal magnetization effect and accurate and reliable detection result, is suitable for mass detection, and is particularly suitable for detecting the annular workpieces, the disk-shaped workpieces or the hollow workpieces with big difference between inner diameter and outer diameter.
Description
Technical field
The utility model relates to the magnetizing coil of a kind of magnetizing assembly of magnaflux, particularly magnaflux.
Background technology
Magnetic powder inspection utilizes magnetic phenomenon to detect surface of the work and near surface flaw, and it is the most frequently used a kind of in the flux-leakage detection method.The basis of magnetic powder inspection is the magnetic interaction of fault location stray field and magnetic.Behind ferromagnetic material or the workpiece magnetizing, the fault location magnetic line of force that reaches nearly surface on the surface deforms, and the effusion surface of the work forms magnetic pole and also forms detectable stray field.At this moment, sprinkle magnetic or water magnetic flaw detection ink on surface of the work, the magnetic particle just can be adsorbed on defect area, demonstrates position, shape and the size of defective, the ultimate principle of magnetic powder inspection that Here it is.When the magnetic line of force was vertical with defective, stray field was the strongest, also helped most detecting of defective; And if parallel with crackle, then the magnetic leakage free field produces, and defective can not be detected.In order to find all defectives, then developed various Magnitizing method, so that on workpiece, set up the magnetic field of various different directions.According to the direction of on workpiece, setting up magnetic field, generally can be divided into circumferential magnetization, longitudinal magnetization and multidirectional magnetization.Circumferential magnetization means to workpiece and directly switches on, and electric current flow through run through the conductor in workpiece centre hole, is intended to set up in the workpiece one around workpiece and the closed magnetic field vertical with workpiece spindle, and the magnetic line of force has closed shape.Circumferential magnetization is mainly used in the defective of finding with the workpiece axially parallel, promptly parallel with direction of current defective.Longitudinal magnetization mean with electric current by around coil, make workpiece magnetizing method along the longitudinal direction, the magnetic line of force in the workpiece is parallel to the axial line of coil.Longitudinal magnetization be mainly used in find with workpiece spindle to vertical defective.Utilize the electromagnetic yoke magnetization to make the magnetic line of force be parallel to workpiece spindle to also belonging to this class of longitudinal magnetization.Multidirectional magnetization means by resultant magnetization and makes it in workpiece to produce a size and direction is circular in time or spirality changes magnetic field.Because the direction in magnetic field is constantly changing on workpiece, so can check out the defective of different directions.Excitation supply is provided by the low-voltage and high-current that transformer secondary output produces usually.
For the circumferential magnetization of annular, dish type or hollow workpiece, to adopt usually and wear excellent method or cable winding method, longitudinal magnetization adopts yoke and coil method to magnetize usually.Wearing excellent method is the method that an electrical conductor is penetrated annular, dish type or hollow workpiece, is called central conductor method or central conductor method again.This method be mainly used in detection along workpiece spindle to longitudinal defect, can find the axial flaw of workpiece surfaces externally and internally and the radially defective of both ends of the surface simultaneously.Owing to wear the magnetic field intensity of excellent method and the diameter of workpiece is inversely proportional to, magnetic field near the center pit surface is stronger than outer surface magnetic field, Distribution of Magnetic Field is very inhomogeneous, the annular that the difference of particularly inside and outside diameter is bigger, dish type or hollow workpiece, and strong outer weak phenomenon is more serious in its Distribution of Magnetic Field; And for the bigger annular of external diameter, dish type or hollow workpiece, the workpiece outside will reach enough magnetic field, and it is very big to wear excellent electric current, and power consumption, magnetization precision are difficult to control.
Cable winding method is to twine annular, dish type or hollow workpiece energising magnetizing method with flexible cable, when adopting this method to magnetize, as long as cable twines evenly, Distribution of Magnetic Field on the workpiece is more even, can form along the Circumferential field of workpiece circumferencial direction, be used to find the radially defective parallel, also can find the axial flaw of workpiece surfaces externally and internally and the radially defective of two sides simultaneously with magnetization current.Its shortcoming is that artificial winding is loaded down with trivial details, and artificial consistance of twining is poor, and inefficiency is not suitable for batch detection.
The utility model content
(1) technical matters that will solve
The utility model provides a kind of open-close type fork-shaped coil of magnaflux, adopts when overcoming the circumferential magnetization of above-mentioned annular, dish type or hollow workpiece and wears the weak point that excellent method or cable twine method.
(2) technical scheme
In order to solve this technical matters, the utility model is taked following scheme:
The utility model provides a kind of magnetic powder inspection magnetizing assembly, the fork-shaped current coil that comprises detected workpiece both ends of the surface position distribution, the fork-shaped current coil is the two sides to detected workpiece and contains shape, the fork-shaped current coil of detected workpiece end face position is to be made up of the outside radial many strip conductors line in center, the fork-shaped current coil of left and right sides endface position is separately fixed on two holders of defect-detecting equipment, two holders can relatively move, but the fork-shaped current coil of left and right sides endface position is connected by the connection terminal of folding, when described connection terminal is closed the fork-shaped current coil is connected to current path.Many of described fork-shaped current coil is more than 3.
Wherein, described magnetic powder inspection magnetizing assembly also comprises the ring current coil, described ring current coil is positioned at the end face of detected workpiece, be abducent gradually annular from inside to outside, the inner terminal of described annular and outermost end are respectively equipped with internal diameter terminal and external diameter terminal, the internal diameter terminal is connected with excitation supply with the external diameter terminal, forms current path.
Wherein, employed excitation supply is the AC power with A, B, C three-phase, and the fork-shaped current coil connects A, B two-phase, and the ring current coil connects B, C two-phase or A, C two-phase.
Wherein, detected workpiece both ends of the surface are provided with two ring current coils, respectively there is a terminal to be connected on two ring current coils, each another one terminal connects B, C two-phase or A, the C two-phase of three-phase excitation supply on two ring current coils, and two ring current coils form a current path.
Wherein, described magnetic powder inspection magnetizing assembly also comprises iron core detection bar magnet, can insert the hole heart of detected workpiece, and described connection terminal is by stingy cylinder driving engagement hold-down mechanism engagement.
Wherein, described connection terminal is arranged at the outer diametric plane of detected workpiece, per two adjacent conductor lines compartment of terrains, the center of the fork-shaped current coil of detected workpiece left side set gradually to connecting and not being connected, per two adjacent conductor lines compartment of terrains, the center of the fork-shaped current coil of detected workpiece right side are set to not be connected and be connected with the left side successively accordingly, make current path of the whole formation of fork-shaped current coil of two end faces.
Wherein, described connection terminal is arranged at the outer diametric plane and the aperture surface of detected workpiece, the corresponding two strip conductor lines of two end faces of detected workpiece form a current path by the connection terminal of outer diametric plane and aperture surface, and the conductor lines of many left and right sides end face correspondences is to forming a plurality of current paths.
Wherein, the closed formation of the fork-shaped current coil of two end faces diameter is the inner space of 600～1500mm, thickness 50～350mm, the internal diameter terminal forms the center of 150～300mm, the conductor lines of the fork-shaped current coil of each end face is six groups, angle between the coil is 60 degree, one set of connections terminal is not closed, and two ends are connected with excitation supply respectively, and other 11 set of connections terminals are by 11 stingy cylinder driving engagement hold-down mechanism engagements.
Wherein, the closed formation of the fork-shaped current coil of two end faces diameter is the inner space of 1500～3500mm, thickness 90～500mm, the internal diameter terminal forms the center of 300～2600mm, the conductor lines of the fork-shaped current coil of each end face is eight groups, angle between the coil is 45 degree, one set of connections terminal is not closed, and two ends are connected with excitation supply respectively, and other 15 set of connections terminals are by 15 stingy cylinder driving engagement hold-down mechanism engagements.
(3) beneficial effect
1, overcome wear excellent method Distribution of Magnetic Field inequality when detecting the bigger annular of external diameter, dish type or hollow workpiece, in serious strong outer a little less than, the magnetization effect is not satisfactory, and the big shortcoming that consumes energy.
2, overcome cable winding legal person worker and twined loaded down with trivial details, inefficiency, be not suitable for the weakness of batch detection.
3, the folding of fork-shaped coil is moved, and has increased dirigibility; The field of conjugate action at prong contact place adopts the engagement of stingy cylinder driving engagement mechanism, guarantees that field of conjugate action contact is good reliable.
4, Distribution of Magnetic Field is more even, has improved accuracy of detection.
Description of drawings
The magnetic powder inspection magnetizing assembly of Fig. 1: the utility model embodiment 1 and detected workpiece
Fig. 2: among Fig. 1 dotted line surround the part by stingy cylinder driving engagement hold-down mechanism
Fig. 3: the connection separately of fork-shaped current coil center, the left and right sides be not connected to form the connection shape of a common current path
Among the figure, 1, holder, 2, iron core surveys bar magnet, 3, the ring current coil, 4, connection terminal, 5, connect the joint of excitation supply, 6, the engagement hold-down mechanism, 7, the fork-shaped current coil, 8, clamping piece, 9, the square shape support, 10, clamping cylinder.
Embodiment
Embodiment is used to illustrate the utility model, but does not limit protection domain of the present utility model.
As shown in Figure 1, detected workpiece is diameter 1250mm, thickness 210mm, the annular workpieces of endoporus 230mm, locomotive wheel for example, annular workpieces such as core wheel, it is the copper rod of 10 * 30mm or the fork-shaped current coil 7 that copper bar is made by specification that the magnetic powder inspection magnetizing assembly has two group of 6 circle, it is shaped as fork-shaped, its every circle is projected as U-shaped, two groups of fork-shaped current coils 7 are separately fixed at detected workpiece both sides, thickness is two epoxy resin board inboards of 15mm, epoxy resin board is connected with the movable device of failure detector by holder 1, not only play fixation but also play the turn-to-turn insulation effect, two groups of fork-shaped current coil 7 structures are open-close type, two epoxy resin board outsides also are fixed with ring current coil 3, also are fixed with iron core on the holder 1 and survey bar magnet 2.The fork-shaped current coil 7 of the left and right sides is connected by the connection terminal 4 at the outer diametric plane place of detected workpiece, the engagement hold-down mechanism 6 that clamping cylinder 10 drives is equipped with in the junction of connection terminal 4, in the square shape support 9 of engagement hold-down mechanism 6 left fork-shaped coil prong is housed, prong is the inclined-plane contact chip, and clamping piece 8 also is housed in the square shape support 9; Right fork-shaped current coil contact is the inclined-plane prong.When the prong of right fork-shaped current coil inserts in the left fork-shaped coil contact place square shape support 9, stingy cylinder action, the driving engagement hold-down mechanism makes the prong inclined-plane engagement of fork-shaped current coil, guarantees that field of conjugate action contact is good reliable.The long 60mm of the yoke of above-mentioned left fork-shaped current coil, the long 600mm of fork back of the body bar, the long 550mm of yoke of right fork-shaped current coil, the long 600mm of fork back of the body bar, inside and outside totally 12 connection terminal places of fork-shaped current coil have 11 the square shape support is housed, and adopt 11 stingy cylinder driving engagement hold-down mechanism engagements altogether, and the angle between the coil is 60 degree, the another one connection terminal does not mesh, and is connected with excitation supply.In use, workpiece is supported by carrying roller, clamping device guarantees that workpiece is stable, and the connection terminal of ring current coil links to each other with A, the B two-phase of the excitation supply with A, B, C three-phase, and the fork-shaped current coil links to each other with B, the C of three-phase supply respectively with the connection terminal that excitation supply connects.During detection, excitation supply is given in the ring current coil and is fed magnetization current, and according to electromagnetic induction principle, this magnetization current produces on workpiece around the workpiece magnetic line of force radially, can find the defective consistent with the workpiece circumferencial direction; Excitation supply is given in the fork-shaped current coil and is fed magnetization current, and according to electromagnetic induction principle, this magnetization current produces the magnetic line of force along the circumferential direction on workpiece, can find the axial flaw of workpiece surfaces externally and internally and the radially defective of both ends of the surface simultaneously.Longitudinal magnetic field and Circumferential field at the alternating magnetic field superposition of the certain angle that staggers on time phase on workpiece, its vector is synchronous at surface of the work formation rotating speed and electric current, the elliptical rotating field that the peak value track is relevant with amplitude, workpiece is carried out resultant magnetization, and the defective of surface of the work any direction can be detected in this magnetic field.Because Circumferential field is evenly distributed, overcome traditional strong outer weak phenomenon in the Distribution of Magnetic Field when wearing excellent method magnetization large-sized annular workpiece.
Embodiment 2
Detected workpiece is diameter 2530mm, thickness 110mm, the especially big annular workpieces of endoporus 1850mm, annular workpieces such as pitch variable bearings Internal and external cycle for example, it is the copper rod of 15 * 40mm or the fork-shaped current coil that copper bar is made by specification that the magnetic powder inspection magnetizing assembly has two group of 8 circle, it is shaped as fork-shaped, its every circle is projected as U-shaped, two groups of fork-shaped current coils are separately fixed at detected workpiece both sides, thickness is two epoxy resin board inboards of 15mm, and epoxy resin board is connected with the movable device of failure detector by holder.The long 80mm of the yoke of above-mentioned left fork-shaped current coil, the long 850mm of fork back of the body bar, the long 450mm of yoke of right fork-shaped coil, the long 1350mm of fork back of the body bar, 15 square shape supports are equipped with at the connection terminal place of fork-shaped current coil altogether, adopt 15 stingy cylinder driving engagement hold-down mechanism engagements altogether, the angle between the coil is 45 degree.
The utility model is applicable to other similarly detections of annular, dish type or hollow workpiece.In the practical application, the size of fork-shaped current coil can be adjusted, and material can be changed, and the angle between the brachium of fork-shaped current coil, the number of turn, the coil also can be made up by other; The cross section of fork-shaped current coil, arm, prong contact also can adopt other shapes; Compress the type of attachment that engaging mechanism also can adopt other structures.
Claims (10)
1, a kind of magnetic powder inspection magnetizing assembly, the fork-shaped current coil that comprises detected workpiece both ends of the surface position distribution, it is characterized in that: the fork-shaped current coil is the two sides to detected workpiece and contains shape, the fork-shaped current coil of detected workpiece end face position is to be made up of the outside radial many strip conductors line in center, the fork-shaped current coil of left and right sides endface position is separately fixed on two holders of defect-detecting equipment, two holders can relatively move, but the fork-shaped current coil of left and right sides endface position is connected by the connection terminal of folding, when described connection terminal is closed the fork-shaped current coil is connected to current path.
2, magnetic powder inspection magnetizing assembly according to claim 1, it is characterized in that: described magnetic powder inspection magnetizing assembly also comprises the ring current coil, described ring current coil is positioned at the end face of detected workpiece, be abducent gradually annular from inside to outside, the inner terminal of described annular and outermost end are respectively equipped with internal diameter terminal and external diameter terminal, the internal diameter terminal is connected with excitation supply with the external diameter terminal, forms current path.
3, magnetic powder inspection magnetizing assembly according to claim 1 is characterized in that: many of described fork-shaped current coil is more than 3.
4, magnetic powder inspection magnetizing assembly according to claim 2 is characterized in that: employed excitation supply is the AC power with A, B, C three-phase, and the fork-shaped current coil connects A, B two-phase, and the ring current coil connects B, C two-phase or A, C two-phase.
5, magnetic powder inspection magnetizing assembly according to claim 4, it is characterized in that: detected workpiece both ends of the surface are provided with two ring current coils, respectively there is a terminal to be connected on two ring current coils, each another one terminal connects B, C two-phase or A, the C two-phase of three-phase excitation supply on two ring current coils, and two ring current coils form a current path.
6, magnetic powder inspection magnetizing assembly according to claim 1 is characterized in that: described magnetic powder inspection magnetizing assembly also comprises iron core detection bar magnet, can insert the hole heart of detected workpiece, and described connection terminal is by stingy cylinder driving engagement hold-down mechanism engagement.
7, magnetic powder inspection magnetizing assembly according to claim 1, it is characterized in that: described connection terminal is arranged at the outer diametric plane of detected workpiece, per two adjacent conductor lines compartment of terrains, the center of the fork-shaped current coil of detected workpiece left side set gradually to connecting and not being connected, per two adjacent conductor lines compartment of terrains, the center of the fork-shaped current coil of detected workpiece right side are set to not be connected and be connected with the left side successively accordingly, make current path of the whole formation of fork-shaped current coil of two end faces.
8, magnetic powder inspection magnetizing assembly according to claim 1, it is characterized in that: described connection terminal is arranged at the outer diametric plane and the aperture surface of detected workpiece, the corresponding two strip conductor lines of two end faces of detected workpiece form a current path by the connection terminal of outer diametric plane and aperture surface, and the conductor lines of many left and right sides end face correspondences is to forming a plurality of current paths.
9, magnetic powder inspection magnetizing assembly according to claim 2, it is characterized in that: the closed formation of the fork-shaped current coil of two end faces diameter is the inner space of 600～1500mm, thickness 50～350mm, the internal diameter terminal forms the center of 150～300mm, the conductor lines of the fork-shaped current coil of each end face is six groups, angle between the coil is 60 degree, one set of connections terminal is not closed, two ends are connected with excitation supply respectively, and other 11 set of connections terminals are by 11 stingy cylinder driving engagement hold-down mechanism engagements.
10, magnetic powder inspection magnetizing assembly according to claim 2, it is characterized in that: the closed formation of the fork-shaped current coil of two end faces diameter is the inner space of 1500～3500mm, thickness 90～500mm, the internal diameter terminal forms the center of 300～2600mm, the conductor lines of the fork-shaped current coil of each end face is eight groups, angle between the coil is 45 degree, one set of connections terminal is not closed, two ends are connected with excitation supply respectively, and other 15 set of connections terminals are by 15 stingy cylinder driving engagement hold-down mechanism engagements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201783225U CN201285386Y (en) | 2008-11-10 | 2008-11-10 | Magnetic powder defect detecting magnifying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201783225U CN201285386Y (en) | 2008-11-10 | 2008-11-10 | Magnetic powder defect detecting magnifying apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN201285386Y true CN201285386Y (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201783225U Expired - Lifetime CN201285386Y (en) | 2008-11-10 | 2008-11-10 | Magnetic powder defect detecting magnifying apparatus |
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| CN (1) | CN201285386Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393168B (en) * | 2008-11-10 | 2011-09-28 | 盐城东车科技有限公司 | Magnetic powder inspection apparatus |
-
2008
- 2008-11-10 CN CNU2008201783225U patent/CN201285386Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393168B (en) * | 2008-11-10 | 2011-09-28 | 盐城东车科技有限公司 | Magnetic powder inspection apparatus |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090805 |