CN103197264B - Magnetism gathering device of magnetic flux leakage detecting sensor and magnetic flux leakage detecting device - Google Patents
Magnetism gathering device of magnetic flux leakage detecting sensor and magnetic flux leakage detecting device Download PDFInfo
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- CN103197264B CN103197264B CN201310097094.4A CN201310097094A CN103197264B CN 103197264 B CN103197264 B CN 103197264B CN 201310097094 A CN201310097094 A CN 201310097094A CN 103197264 B CN103197264 B CN 103197264B
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Abstract
The invention provides a magnetism gathering device of a magnetic flux leakage detecting sensor and a magnetic flux leakage detecting device. The magnetism gathering device is provided with a Hall element and a magnetism gathering cover. The Hall element is arranged in the horizontal direction. The magnetism gathering cover buckles and covers the Hall element. The Hall element in the horizontal direction forms the bottom face of the magnetism gathering cover which corresponds to a frontal plane of projection on the surface of the Hall element. The size of the frontal plane of projection is smaller than the effective outer superficial area, corresponding to the frontal plane of projection, of the magnetism gathering cover. The magnetism gathering cover is a cover body made of high permeability materials. The Hall element is a flat-plate-shaped element. The magnetism gathering device of the magnetic flux leakage detecting sensor can effectively improve sensitivity and accuracy of magnetic flux leakage detection.
Description
Technical field
The present invention relates to a kind of leakage magnetic detection device, especially relate to a kind of poly-magnetic device and the leakage magnetic detection device that effectively can improve the Magnetic Flux Leakage Inspecting sensor of Magnetic Flux Leakage Inspecting sensitivity and accuracy.
Background technology
Magnetic Flux Leakage Inspecting technology is a kind of lossless detection method, and application and extensively in present industrial inspection field, it can by providing quick and the detecting appraisal of low cost to the bow and arrow of ferrimagnet.
The ultimate principle of Magnetic Flux Leakage Inspecting: local magnetized is carried out to tested test specimen, when there is the defect such as crackle or hole point in material surface, form the stray field of blemish surface regional area, magnetic leakage signal changes with the difference of defect geometry shape, adopt the testing circuit of the composition of the Magnetic Sensor as hall device to detect the change of stray field, just can differentiate defect situation according to the magnetic leakage signal recorded.Nondestructive detection with magnetic flux leakage comprises forward and inverse problem.Just drilling i.e. defect and magnetic leakage field analysis, is the distribution that known source and defect shape ask magnetic field; Inverting refers to the reconstruct of defect, by the form parameter of given stray field data assessment defect, thus realizes the quantification of defects detection and then visual.Both at home and abroad about the research work of Magnetic Flux Leakage Inspecting principle mainly contains the Inversion Calculation model of the forward modelling model of Magnetic Flux Leakage Inspecting, the pre-service of magnetic leakage signal and Magnetic Flux Leakage Inspecting.
In the middle of growing commercial Application, the more accurate accuracy of detection in testing process is more and more valued by the people with detection availability problem and demand.Present stage, general leakage magnetic detection device due to accuracy of detection inadequate, the fine defects for tested ferromagnetic material cannot accurately be found out, and effectively cannot shift to an earlier date the in esse security hidden trouble of equipment, result in later stage passive relevant treatment, cause even large-scale accident to occur.
In petroleum industry field, storage tank Magnetic Flux Leakage Inspecting sensor device now, can only receive the magnetic leakage signal in conversion both direction, but can not converge the stray field be dissipated in air and collect, there is certain error, cause sensor accuracy and susceptibility not high.Often cause carrying out flaw detection inaccurate, defect knows the generation of the problem such as not in time, in order to avoid the generation of security incident, ensure the efficiency that oil stores, urgently a kind of Magnetic Flux Leakage Inspecting equipment that can realize improving in Magnetic Flux Leakage Inspecting accuracy of detection and detection sensitivity simply occurs.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of poly-magnetic device and leakage magnetic detection device of Magnetic Flux Leakage Inspecting sensor, effectively improves Magnetic Flux Leakage Inspecting sensitivity and accuracy.
Technical solution of the present invention is:
A poly-magnetic device for Magnetic Flux Leakage Inspecting sensor, wherein, this poly-magnetic device is provided with:
Hall element, comprises the described Hall element of a horizontal direction;
Poly-magnetic cover, buckle closure is on described Hall element, and the described Hall element of horizontal direction forms a bottom surface of this poly-magnetic cover; Wherein, described poly-magnetic covers in described Hall element on the surface to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover effective external surface area corresponding with this frontal plane of projection;
Described poly-magnetic cover is the cover body that high permeability material is made, and described Hall element is flat component.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic cover is a prismatoid, and the bottom surface of this prismatoid is the described Hall element of horizontal direction, and the end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is larger.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic cover is a convex outward lid, and the described Hall element of horizontal direction is the bottom surface of this convex outward lid.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described convex outward lid is the tubular lid of half, and the described Hall element of horizontal direction is that this semicolumn bodily form lid is in bottom surface diametrically.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described Hall element also comprises the described Hall element of at least one vertical direction, and each described Hall element is vertically arranged mutually;
Described poly-magnetic cover buckle closure is on orthogonal described Hall element, and the described Hall element of vertical direction forms the side of this poly-magnetic cover; Wherein, described poly-magnetic covers in the described Hall element of vertical direction on the surface also to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover effective external surface area corresponding with this frontal plane of projection.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic cover is a prismatoid, and the bottom surface of this prismatoid is the described Hall element of horizontal direction, and the Hall element of vertical direction is the side of this prismatoid; The end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is larger.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic cover is a convex outward lid, the described Hall element of horizontal direction is and the song of this convex outward lid bottom surface face to face that the described Hall element of at least one vertical direction is other sides of this convex outward lid.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described convex outward lid is a quadrant cylinder shape lid, and the cambered surface of described cylindrical lid is the arc surface of a thickness convergent, wherein, the described arc surface thickness of side of being connected with the described Hall element of horizontal direction is larger.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic device is provided with the Hall element of a vertical direction and the Hall element of a horizontal direction.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic device is provided with the Hall element of two vertical direction and the Hall element of a horizontal direction.
The poly-magnetic device of above-mentioned Magnetic Flux Leakage Inspecting sensor, wherein, described poly-magnetic cover is made up of ingot iron.
A kind of leakage magnetic detection device, wherein, for detecting the defect of ferromagnetism steel plate, this leakage magnetic detection device is provided with: magnetization dolly and leakage field sensor;
Described leakage field sensor is provided with sensor box, is provided with the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as above in described sensor box; The described Hall element of horizontal direction is fixed to the upper surface of the horizonal base plate of described sensor box;
Described magnetization dolly cross section is the concave shape of a left-hand thread, and its top is armature, and described armature both sides are fixed with magnet respectively, are fixed with pole shoe below described magnet; The lower surface of the described armature that described sensor box is fixed on, and described in both sides between magnet;
The surface of described sensor box and described steel plate is provided with a fixed range.
Above-mentioned leakage magnetic detection device, wherein, be provided with the poly-magnetic device of multiple described Magnetic Flux Leakage Inspecting sensor in described sensor, the poly-magnetic device of each described Magnetic Flux Leakage Inspecting sensor is set up in parallel in the same way, and forms array.
Above-mentioned leakage magnetic detection device, wherein, the horizonal base plate of described sensor box is provided with an insulcrete, and the poly-magnetic device of described Magnetic Flux Leakage Inspecting sensor is fixed on described insulcrete.
Above-mentioned leakage magnetic detection device, wherein, described sensor box bottom surface is provided with crashproof lead angle, is provided with elastic buffering mechanism between itself and described armature lower surface.
Above-mentioned leakage magnetic detection device, wherein, described elastically damping device is set to the axis of guide connecting described armature and sensor box and the spring be sheathed on the described axis of guide, and described spring supports described sensor box and described armature lower surface.
Above-mentioned leakage magnetic detection device, wherein, described armature is made up of ingot iron or slope Mo alloy; Described magnet is made up of rare-earth permanent magnet; Described pole shoe is made up of ingot iron.
By learning above, the present invention has following advantage really:
1, the stray field of magnetism-collected structure collection space of the present invention distribution, and be directed in the detection path of Hall element, the scope as far as possible enabling more magnetic flux be pooled to Hall element to receive.Will be improved by the stray field data amplitude detected after poly-magnetic, thus strengthen the sensitivity detected, the stray field magnetic induction density amplitude collected can be improved, thus improve accuracy and the sensitivity of the sensor of device to greatest extent.
2, the present invention can be widely used in the every field such as chemical industry, petrochemical industry, the energy, light industry, pharmacy, refrigeration, power, environmental protection, biochemistry, food, machinery, labor safety.
In order to overcome, accuracy in the detection of existing sensor is not high, the not high deficiency of low precision, susceptibility in the present invention, simultaneously also in order to change the defect of existing Magnetic Flux Leakage Inspecting technology in practical implementation, enable sensor in testing process, converge the stray field of collection space distribution, improve accuracy and the sensitivity of the sensor of device to greatest extent, set up a poly-magnetic cover and Hall element is bonding puts.When there being stray field to produce, the stray field of magnetism-collected structure collection space distribution, and be directed in the detection path of the sensor of Hall element, the stray field magnetic induction density amplitude collected can be improved, thus improve accuracy and the sensitivity of device.The present invention can complete tank floor inspection task effectively, produces larger economic benefit.
Accompanying drawing explanation
Fig. 1 to Fig. 5 B is the structural representation of the preferred embodiment of the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor of the present invention;
Fig. 6 is the structural representation of the sensor box of leakage magnetic detection device of the present invention;
Fig. 7 is the sensor box plan structure schematic diagram of leakage magnetic detection device of the present invention;
Fig. 8 is leakage magnetic detection device structural representation of the present invention.
Main element label declaration:
The present invention:
1: poly-magnetic cover 2: Hall element 3: sensor box
4: armature 5: magnet 6: pole shoe
7: steel plate J: poly-magnetic device
Embodiment
The poly-magnetic device of a kind of Magnetic Flux Leakage Inspecting sensor of the present invention, wherein, this poly-magnetic device is provided with: Hall element and poly-magnetic cover.Hall element comprises the described Hall element of at least one horizontal direction; Poly-magnetic cover buckle closure is on described Hall element, and the described Hall element of horizontal direction forms a bottom surface of this poly-magnetic cover; Wherein, described poly-magnetic covers in described Hall element on the surface to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover effective external surface area corresponding with this frontal plane of projection; Described poly-magnetic cover is the cover body that high permeability material is made, and described Hall element is flat component.
Meanwhile, a kind of leakage magnetic detection device of the present invention, for detecting the defect of ferromagnetism steel plate, this leakage magnetic detection device is provided with: magnetization dolly and leakage field sensor; Described leakage field sensor is provided with sensor box, is provided with the poly-magnetic device of described Magnetic Flux Leakage Inspecting sensor in described sensor box; The described Hall element of horizontal direction is fixed to the horizontal bottom of described sensor box; Described magnetization dolly cross section is the concave shape of a left-hand thread, and its top is armature, and described armature both sides are fixed with magnet respectively, are fixed with pole shoe below described magnet; The lower surface of the described armature that described sensor box is fixed on, and described in both sides between magnet; The surface of described sensor box and described steel plate is provided with a fixed range.The poly-magnetic cover made by ingot iron by utilization and Hall element are bonded, when defectiveness magnetic leakage signal produces, the stray field of poly-magnetic device collection space distribution, and be directed in the detection path of Hall element, the scope as far as possible enabling more magnetic flux be pooled to Hall element to receive.Will be improved by the stray field data amplitude detected after poly-magnetic, thus strengthen the sensitivity detected, the stray field magnetic induction density amplitude collected can be improved, thus improve accuracy and the sensitivity of the sensor of device to greatest extent.
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Please refer to shown in Fig. 1, is the structural representation of the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor of the present invention, and as shown in the figure, the poly-magnetic device of a kind of Magnetic Flux Leakage Inspecting sensor of the present invention, preferably, this poly-magnetic device J is provided with: Hall element 2 and poly-magnetic cover 1.Described Hall element 2 comprises the described Hall element 2 of at least one horizontal direction; Hall element 2 can detect the intensity size of the magnetic flux through Hall element 2 surface; Described poly-magnetic cover 1 buckle closure is on described Hall element 2, and the described Hall element 2 of horizontal direction forms a bottom surface of this poly-magnetic cover 1; Wherein, described poly-magnetic cover 1 is in described Hall element 2 on the surface to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover 1 effective external surface area corresponding with this frontal plane of projection; Poly-magnetic cover 1 buckle closure in described Hall element 2 on the surface, poly-magnetic cover 1 is not orthogonal to the area sum on each surface of described Hall element 2 as useful area, therefore the area making the useful area sum of poly-magnetic cover 1 outside surface corresponding with the frontal projected area on Hall element 2 be magnetic flux to pass through, by increasing the area that magnetic flux passes through, assemble the magnetic flux had perpendicular to Hall element 2 durection component and pass through poly-magnetic cover 1, thus through Hall element 2, make Hall element 2 magnetic flux of maximum intensity be detected as much as possible, improve detection sensitivity and degree of accuracy.The cover body that described poly-magnetic cover 1 is made for high permeability material, thus be convenient to assemble magnetic flux, and described Hall element 2 is flat component, during measurement, flat Hall element is mainly corresponding targetedly detects the magnetic flux with direction vertical with it.
As shown in Figure 1, the poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor of the present invention, in preferably embodiment, described poly-magnetic cover 1 is a prismatoid, the bottom surface of this prismatoid is the described Hall element 2 of horizontal direction, and the end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is larger.Therefore, the external surface area of the whole poly-magnetic cover 1 corresponding with bottom surface is effective external surface area, this area will much larger than the area of bottom surface, thus makes to gather on this effective external surface area and a large amount of magnetic flux passed through can both be further advanced by the Hall element of bottom surface and be detected.Certainly, the poly-magnetic cover 1 of this prismatoid also can be non-regular polyhedron, and such as end face is one to be suitable for too with uneven inclined-plane, bottom surface.As long as the effective external surface area on poly-magnetic cover 1 can be increased.
Please refer to shown in Fig. 2, is another preferred embodiment of the poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor of the present invention, and as shown in the figure, described poly-magnetic cover 1 is a convex outward lid, and the described Hall element 2 of horizontal direction is the bottom surface of this convex outward lid; Namely this poly-magnetic cover 1 be a smooth curved surface buckle closure on the Hall element 2 of described horizontal direction, make the effective external surface area on poly-magnetic cover 1 much larger than the area of bottom surface.
As shown in Figure 3, for the another preferred embodiment of the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor of the present invention, as shown in the figure, described convex outward lid is the tubular lid of half, and the described Hall element 2 of horizontal direction is that this semicolumn bodily form lid is in bottom surface diametrically; Its circular arc camber is the effective external surface area of corresponding bottom surface, and the area of this circular arc camber is much larger than the area of bottom surface.Be detected by Hall element after making magnetic flux pass through the gathering of poly-magnetic cover 1.
Please refer to shown in Fig. 4, the schematic diagram of an embodiment of the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor of the present invention, preferably, described Hall element 2 also comprises the described Hall element 2 of at least one vertical direction, and each described Hall element 2 is mutually vertical to be arranged; Increase the Hall element 2 in other directions vertical with former horizontal direction, the detection of magnetic flux can be carried out in the other direction simultaneously, by the mode of similar superposition calculation, the magnetic flux in both direction is superposed after sensing, finally obtain more accurate Magnetic Flux Leakage Inspecting structure.And described poly-magnetic cover 1 buckle closure is on orthogonal described Hall element 2, the described Hall element 2 of vertical direction forms the side of this poly-magnetic cover 1; Wherein, described poly-magnetic cover 1 is in the described Hall element 2 of vertical direction on the surface also to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover 1 effective external surface area corresponding with this frontal plane of projection.With the setting of the Hall element of horizontal direction in like manner, the effective external surface area of the poly-magnetic cover 1 corresponding with the Hall element surface of vertical direction is greater than the area of the Hall element 2 of poly-magnetic cover 1 buckle closure, poly-magnetic cover 1 can be made like this to gather magnetic flux again through the Hall element of vertical direction, improve accuracy of detection.
Shown in Fig. 4, the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor of the present invention, preferably, described poly-magnetic cover 1 is a prismatoid, and the bottom surface of this prismatoid is the described Hall element 2 of horizontal direction, and the Hall element 2 of vertical direction is the side of this prismatoid; The end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is large compared with end face.In this preferred embodiment, bottom surface is larger than end face, and the Hall element 2 of two sides can be made all to have effective external surface area on the larger poly-magnetic cover 1 of area, strengthens poly-magnetic energy power, detects while realizing lateral flux in the two directions.
Referring to shown in Fig. 5 A, is another embodiment with vertical direction Hall element 2 of the poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor of the present invention.Wherein, described poly-magnetic cover 1 is a convex outward lid, and the described Hall element 2 of horizontal direction is a bottom surface relative with the curved surface of this convex outward lid, and the described Hall element 2 of at least one vertical direction is other sides of this convex outward lid.Be effective outside surface because convex outward defines relative to the corresponding outside surface on Hall element 2 surface of horizontal or vertical direction, thus magnet accumulating cap can be realized by position Hall element 2 in the two directions, improve the precision of Magnetic Flux Leakage Inspecting.This convex outward also can be various irregular curved surface, as long as poly-magnetic cover 1 can be made to form larger effective outside surface.
Refer to shown in Fig. 5 B, for another embodiment of poly-magnetic device of the present invention's Magnetic Flux Leakage Inspecting as above sensor, preferably, described convex outward lid is a quadrant cylinder shape lid, and the cambered surface of described cylindrical lid is the arc surface of a thickness convergent, wherein, the described arc surface thickness of side of being connected with the described Hall element 2 of horizontal direction is larger.Poly-magnetic cover 1 in this embodiment is similar to poly-magnetic cover 1 structure of aforementioned prismatoid, but its effective outside surface can be larger, plays better poly-magnetic effect.
Preferably, the poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor as above, the Hall element 2 of vertical direction can detect the magnetic flux of the horizontal direction on vertical described vertical direction Hall element 2 surface, the detection of the magnetic flux of all directions is relatively independent, and the result detecting gained obtains more accurate Magnetic Flux Leakage Inspecting result by last calculating superposition; As shown in figure aforementioned figures, described poly-magnetic device J is provided with the Hall element 2 of a vertical direction and the Hall element 2 of a horizontal direction.But not as limit, poly-magnetic device J of the present invention can detect the magnetic flux of multiple directions on surface level, therefore, in other embodiment, the poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor of the present invention also can be provided with the Hall element 2 of two vertical direction and the Hall element 2 of a horizontal direction, and mutually vertical between each Hall element 2, strengthens the covering scope of Magnetic Flux Leakage Inspecting, less leakage field can be detected, improve sensitivity.
The poly-magnetic device J of Magnetic Flux Leakage Inspecting sensor of the present invention as above, preferably, described poly-magnetic cover 1 is made up of ingot iron.
Refer to shown in Fig. 6 to Fig. 8, the preferred embodiment of a kind of leakage magnetic detection device of the present invention, for detecting the defect of ferromagnetism steel plate 7.Preferably this leakage magnetic detection device is provided with: magnetization dolly and leakage field sensor; Hang described leakage field sensor by magnetization dolly to detect on ferromagnetism steel plate 7 surface to be measured.Described leakage field sensor is provided with sensor box 3, and this sensor box 3 is arranged in this magnetization dolly, and arranges towards steel plate 7 direction to be measured.The poly-magnetic device J of foregoing Magnetic Flux Leakage Inspecting sensor is installed in described sensor box 3; Wherein, the described Hall element 2 of the horizontal direction in this poly-magnetic device J is fixed to the upper surface of the horizonal base plate of described sensor box 3.In addition, described magnetization dolly cross section is the concave shape of a left-hand thread, and its top is armature 4, and described armature 4 both sides are fixed with magnet 5 respectively, are fixed with pole shoe 6 below described magnet 5, forms the support leg structure of both sides; The lower surface of the described armature 4 that described sensor box 3 is fixed on, and between the described magnet 5 of both sides; And described sensor box 3 is provided with a fixed range with the surface of described steel plate 7.
As shown in the figure, leakage magnetic detection device of the present invention, in preferred embodiment, be provided with the poly-magnetic device J of multiple described Magnetic Flux Leakage Inspecting sensor in described sensor, the poly-magnetic device J of each described Magnetic Flux Leakage Inspecting sensor is set up in parallel in the same way, and forms array.Concrete array format, mainly determines according to the concrete area shape of tested steel plate 7 and measurement demand, can form strip, also can form the array pattern of various specific shape.
Leakage magnetic detection device of the present invention; preferably; the horizonal base plate of described sensor box 3 is also provided with an insulcrete; the poly-magnetic device J of described Magnetic Flux Leakage Inspecting sensor is fixed on described insulcrete; not only its insulation buffer action; also better protect poly-magnetic device J, the acting force of collision free acts directly on poly-magnetic device J, is also convenient to installation and removal simultaneously.
Leakage magnetic detection device of the present invention, preferably, described sensor box 3 bottom surface is provided with crashproof lead angle, is provided with elastic buffering mechanism between itself and described armature 4 lower surface.When sensor box 3 carries out moving in parallel in the process of detection within the scope of tested steel plate 7 on the surface certain distance, run into protruding structure possibly and collide, by the setting of crashproof lead angle, collision can be made to become cambered surface sliding friction contact, damp impacts acting force; By the syndeton between armature 4 lower surface up and sensor box 3 arranges snubber assembly, further the collision of sensor box 3 with thrust can be cushioned, prevent the situation damaged sensor box 3 and block sensor box 3.
Leakage magnetic detection device of the present invention as above, better buffering effect can be realized to make sensor box 3, preferably, described elastically damping device is set to the axis of guide connecting described armature 4 and sensor box 3 and the spring be sheathed on the described axis of guide, and described spring supports described sensor box 3 and described armature 4 lower surface.One end of the axis of guide is fixedly mounted on armature 4, and the other end is then limited on the housing of sensor box 3, and can relative sliding; Supporting whereby by spring, under sensor box 3 remains on state bottom, when running into thrust extruding, sensor box 3 Compress Spring, and upwards cushion movement, reduce colliding forces.In addition, one end of the axis of guide also can be fixed on sensor box 3, and its other end can be limited on described armature 4 actively.
Leakage magnetic detection device of the present invention as above, each several part in order to this leakage magnetic detection device can both reach the demand of detection, and described armature 4 can be made up of ingot iron or slope Mo alloy; Described magnet 5 is made up of rare-earth permanent magnet; Described pole shoe 6 is made up of ingot iron, detects stability and degree of accuracy to improve.
The present invention adapts to the detection demand of Magnetic Flux Leakage Inspecting, strengthens susceptibility and the accuracy of sensing device, and sensor device has can the stray field of collection space distribution, and is directed to the function in the detection path of the sensor of Hall element 2.The present invention in preferably embodiment, the poly-magnetic cover 1 manufactured by ingot iron by vertical glue joint one, the scope as far as possible enabling more magnetic flux be pooled to Hall element to receive.Therefore, adopt the stray field of magnetism-collected structure collection space distribution, and be directed in the detection path of the sensor of Hall element, the stray field magnetic induction density amplitude collected can be improved, thus improve accuracy and the sensitivity of the sensor of device to greatest extent.
In the preferably embodiment of sensor box of the present invention, poly-magnetic cover 1 is bonding with two rectangular Hall elements, and as one group, many group transverse directions are arranged in sensor box.Wherein, Hall element can detect the stray field intensity in both direction, the stray field of poly-magnetic cover 1 collection space distribution, and be directed in the detection path of the sensor of Hall element, the stray field magnetic induction density amplitude collected can be improved, thus improve accuracy and the sensitivity of the sensor of device to greatest extent.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (17)
1. a poly-magnetic device for Magnetic Flux Leakage Inspecting sensor, is characterized in that, this poly-magnetic device is provided with:
Hall element, comprises the described Hall element of at least one horizontal direction;
Poly-magnetic cover, buckle closure is on described Hall element, and the described Hall element of horizontal direction forms a bottom surface of this poly-magnetic cover; Wherein, described poly-magnetic covers in described Hall element on the surface to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover effective external surface area corresponding with this frontal plane of projection;
Described poly-magnetic cover is the cover body that high permeability material is made, and described Hall element is flat component.
2. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 1, it is characterized in that, described poly-magnetic cover is a prismatoid, and the bottom surface of this prismatoid is the described Hall element of horizontal direction, the end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is larger.
3. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 1, it is characterized in that, described poly-magnetic cover is a convex outward lid, and the described Hall element of horizontal direction is the bottom surface of this convex outward lid.
4. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 3, it is characterized in that, described convex outward lid is the tubular lid of half, and the described Hall element of horizontal direction is that this semicolumn bodily form lid is in bottom surface diametrically.
5. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 1, it is characterized in that, described Hall element also comprises the described Hall element of at least one vertical direction, and each described Hall element is vertically arranged mutually;
Described poly-magnetic cover buckle closure is on orthogonal described Hall element, and the described Hall element of vertical direction forms the side of this poly-magnetic cover; Wherein, described poly-magnetic covers in the described Hall element of vertical direction on the surface also to there being a frontal plane of projection, and the area of described frontal plane of projection is less than the described poly-magnetic cover effective external surface area corresponding with this frontal plane of projection.
6. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 5, it is characterized in that, described poly-magnetic cover is a prismatoid, and the bottom surface of this prismatoid is the described Hall element of horizontal direction, and the Hall element of vertical direction is the side of this prismatoid; The end face of this prismatoid is parallel with bottom surface, and the area of described bottom surface is large compared with end face.
7. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 5, it is characterized in that, described poly-magnetic cover is a convex outward lid, the described Hall element of horizontal direction is a bottom surface relative with the curved surface of this convex outward lid, and the described Hall element of at least one vertical direction is other sides of this convex outward lid.
8. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 7, it is characterized in that, described convex outward lid is a quadrant cylinder shape lid, and the cambered surface of described cylindrical lid is the arc surface of a thickness convergent, wherein, the described arc surface thickness of side of being connected with the described Hall element of horizontal direction is larger.
9. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 5, it is characterized in that, described poly-magnetic device is provided with the Hall element of a vertical direction and the Hall element of a horizontal direction.
10. the poly-magnetic device of Magnetic Flux Leakage Inspecting sensor as claimed in claim 5, it is characterized in that, described poly-magnetic device is provided with the Hall element of two vertical direction and the Hall element of a horizontal direction.
The poly-magnetic device of 11. Magnetic Flux Leakage Inspecting sensors as claimed in claim 1, is characterized in that, described poly-magnetic cover is made up of ingot iron.
12. 1 kinds of leakage magnetic detection devices, is characterized in that, for detecting the defect of ferromagnetism steel plate, this leakage magnetic detection device is provided with: magnetization dolly and leakage field sensor;
Described leakage field sensor is provided with sensor box, is provided with the poly-magnetic device of the Magnetic Flux Leakage Inspecting sensor as described in claim 1 to 11 any one in described sensor box; The described Hall element of horizontal direction is fixed to the upper surface of the horizonal base plate of described sensor box;
Described magnetization dolly cross section is the concave shape of a left-hand thread, and its top is armature, and described armature both sides are fixed with magnet respectively, are fixed with pole shoe below described magnet; The lower surface of the described armature that described sensor box is fixed on, and described in both sides between magnet;
The surface of described sensor box and described steel plate is provided with a fixed range.
13. leakage magnetic detection devices as claimed in claim 12, is characterized in that, are provided with the poly-magnetic device of multiple described Magnetic Flux Leakage Inspecting sensor in described sensor, and the poly-magnetic device of each described Magnetic Flux Leakage Inspecting sensor is set up in parallel in the same way, and forms array.
14. leakage magnetic detection devices as claimed in claim 12, it is characterized in that, the horizontal bottom of described sensor box is provided with an insulcrete, and the poly-magnetic device of described Magnetic Flux Leakage Inspecting sensor is fixed on described insulcrete.
15. leakage magnetic detection devices as claimed in claim 12, it is characterized in that, described sensor box bottom surface is provided with crashproof lead angle, is provided with elastic buffering mechanism between itself and described armature lower surface.
16. leakage magnetic detection devices as claimed in claim 15, it is characterized in that, described elastically damping device is set to the axis of guide connecting described armature and sensor box and the spring be sheathed on the described axis of guide, and described spring supports described sensor box and described armature lower surface.
17. leakage magnetic detection devices as claimed in claim 12, is characterized in that, described armature is made up of ingot iron or slope Mo alloy; Described magnet is made up of rare-earth permanent magnet; Described pole shoe is made up of ingot iron.
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| CN104569142A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气集团公司 | U-shaped detection probe based on AC magnetic field detection and detection method |
| CN104359969B (en) * | 2014-11-07 | 2017-03-08 | 西红柿科技（武汉）有限公司 | Magnetic Flux Leakage Inspecting head is pushed up in a kind of pole |
| CN107015047B (en) * | 2017-04-13 | 2019-10-15 | 国网重庆市电力公司电力科学研究院 | A kind of iron-core-free Hall current sensor |
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| CN1930451A (en) * | 2004-03-11 | 2007-03-14 | 罗伯特·博世有限公司 | Magnet sensor arrangement |
| CN201697892U (en) * | 2010-04-09 | 2011-01-05 | 新疆三叶管道技术有限责任公司 | Leakage magnetic flux detector |
| CN203241525U (en) * | 2013-03-25 | 2013-10-16 | 中国石油天然气股份有限公司 | Magnetic focusing device of magnetic flux leakage testing sensor and magnetic flux leakage testing device |
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| JPH04296648A (en) * | 1991-03-27 | 1992-10-21 | Nippon Steel Corp | Method and device for magnetic crack detection |
| JPH07294491A (en) * | 1994-04-27 | 1995-11-10 | Nkk Corp | Magnetic flaw detector |
| JP3811039B2 (en) * | 2000-10-18 | 2006-08-16 | Ｊｆｅスチール株式会社 | Magnetic leak detection sensor for magnetic flaw detector |
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| CN1930451A (en) * | 2004-03-11 | 2007-03-14 | 罗伯特·博世有限公司 | Magnet sensor arrangement |
| CN201697892U (en) * | 2010-04-09 | 2011-01-05 | 新疆三叶管道技术有限责任公司 | Leakage magnetic flux detector |
| CN203241525U (en) * | 2013-03-25 | 2013-10-16 | 中国石油天然气股份有限公司 | Magnetic focusing device of magnetic flux leakage testing sensor and magnetic flux leakage testing device |
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