CN1117276C - Overhead specially-shaped coil for magnetic-powder flaw detector - Google Patents
Overhead specially-shaped coil for magnetic-powder flaw detector Download PDFInfo
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- CN1117276C CN1117276C CN 98111498 CN98111498A CN1117276C CN 1117276 C CN1117276 C CN 1117276C CN 98111498 CN98111498 CN 98111498 CN 98111498 A CN98111498 A CN 98111498A CN 1117276 C CN1117276 C CN 1117276C
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Abstract
The present invention provides a hollow special-shaped coil for magnetic particle flaw detectors. The shape and the size of the special-shaped coil formed by a copper bar are in accordance with the dimension and the shape of a detected workpiece, and the shape is different from general circular coils and open-ended coils. The present invention overcomes the disadvantage of the nonideal magnetization effect of circular coils to workpieces with larger dimension or irregular edges and has the advantages of ideal magnetization effect to workpieces, accurate test result and reliability. The present invention also overcomes the disadvantages of poor contact and short service life of open-ended coils, and the service life of coils is extended. The interference rejection and the control precision of coils are improved, and coils can be repaired and maintained simply and conveniently.
Description
Affiliated technical field
The present invention relates to the coil in a kind of parts of magnaflux, particularly magnaflux.
Background technology
Magnetic powder inspection is to utilize magnetic phenomenon to detect the method for workpiece, defect, it is a kind of nondestructive means to ferromagnetic materials surface or near surface flaw, it is to produce stray field at the workpiece, defect place, the two poles of the earth of stray field and the two poles of the earth of magnetic interact, and magnetic will be attracted and quicken to move on to fault location.The magneticaction of stray field is on the magnetic particulate, and its direction is pointed to lines of magnetic induction maximal density district, promptly points to fault location, the width of stray field than the width of defective big several times to tens times, so the magnetic trace can amplify defective, make it to be detected easily.During the workpiece sensing magnetization, magnetic direction is vertical with the defective direction as far as possible, could produce enough stray fields like this, and it is just the most clear that defective shows.In order to find all defectives, developed various Magnitizing method, according to the direction in the magnetic field of on workpiece, setting up, adopt circumferential magnetization, longitudinal magnetization and resultant magnetization method usually.Circumferential magnetization is to utilize the low-voltage and high-current of the secondary generation of circumferential magnetization transformer directly to flow in the workpiece by magnetic head, in workpiece, produce one around workpiece and with workpiece spindle to vertical magnetic field, it is mainly used in and detects the defective parallel with workpiece; Longitudinal magnetization is to utilize the low-voltage and high-current of the secondary generation of longitudinal magnetization transformer by the coil that connects of mode with series connection, produces magnetic field with the workpiece axially parallel by coil, detect with workpiece spindle to vertical defective; Resultant magnetization then be utilize longitudinal magnetic field and Circumferential field at the alternating magnetic field superposition of certain angle that staggers on time phase on workpiece, its vector is synchronous at rotating speed of surface of the work formation and electric current, the elliptical rotating field that the peak value track is relevant with amplitude, demonstration can both be scanned to the defective of surface of the work any direction in this magnetic field.
At present, the coil that is adopted in the domestic and international magnaflux is copper cash and turns to the typical circular coil of spring-like or the open stich of being made up of two semicircles.Circular coil is when more greatly or not too the workpiece of rule detects to size, and its magnetization effect is not satisfactory.As: when the workpiece of longer dimension is magnetized, the circular coil that is adopted can not have enough length again, the external magnetic field of coil reduces rapidly along with the increase of distance coil end face distance like this, workpiece position far away outside coil just can not get necessary magnetization, if coil is done to move detection along workpiece, can produce phenomenons such as omission again; When the bigger workpiece of diameter was magnetized, the diameter of coil just must be sufficiently large thereupon, and the magnetic field of coil section is just inhomogeneous like this, and the strongest near the coil wall, past more external magnetic field is weak more, and consequently workpiece magnetizing is inhomogeneous, and it is undesirable to detect effect; Equally, for the more greatly or not too detection of the workpiece of rule of size, it circumferentially, vertically reaches resultant magnetization also just can not be uniform, and testing result is also just undesirable certainly.Two semicircles, the rectangular coil in cross section that open stich is poured into by copper material are formed, and an end of two semicircular couples together with screw and can relatively rotate; Its other end can be opened when the upper and lower material of workpiece, also couples together with screw during magnetization.Open stich is mainly used in and detects the crankshaft type workpiece, and still, the easy loose contact of its joint, serviceable life lack.And poor anti jamming capability, the control accuracy of circular coil and open stich are low, and maintenance, maintenance are also inconvenient.
Summary of the invention
The object of the present invention is to provide a kind of aerial special-shaped coils of magnaflux, to overcome the weak point of above-mentioned circular coil and open stich.
Technical solution of the present invention is: by the special-shaped coils that copper bar is made, the size and the shape of its shape and size and detected workpiece adapt, and its shape is different from typical circular coil and open stich.
When being used to detect length and being the workpiece of 3800-4200mm, comprise four rectangular frame shapes of making by copper bar, its side is L shaped special-shaped coils, the long edge break of above-mentioned rectangle frame becomes L shaped, L shaped angle is 120 degree.
Be used to detect the workpiece that length is 500-1200mm, comprise the special-shaped coils of two rectangular frame shapes of making by copper bar and rectangular frame shape, its side is L shaped special-shaped coils; Two long edge breaks of above-mentioned L shaped special-shaped coils rectangle frame become L shaped, and L shaped angle is 105 degree.
The locomotive wheel in irregular shape that is used to detect length and is 2000mm, maximum gauge and be 1200mm is to the gear workpiece, comprise two rectangular frame shapes of making by copper bar, its side is the special-shaped coils of several fonts; Wherein two of the rectangle frame long edge breaks become several fonts, the left-falling stroke stroke of several fonts real for along radially perpendicular stroke of workpiece cam, along workpiece spindle to horizontal stroke and be in the outward-dipping left-falling stroke stroke of workpiece end and form, wherein outward-dipping left-falling stroke stroke becomes 15 to spend angles with workpiece; The length of the horizontal stroke in top of several fonts should be greater than the width of workpiece cam; The perpendicular folding of several fonts stroke be along the workpiece cam radially with the axial outside of workpiece, and the perpendicular end of rolling over stroke of a few font is the edge of a projection.
The invention has the beneficial effects as follows: because its shape and the size of detected workpiece and the special-shaped coils that shape adapts that adopt copper bar to make, thereby have the following advantages:
1, overcome circular coil to the size workpiece magnetizing effect not satisfactory shortcoming of rule more greatly or not too, made workpiece magnetizing satisfactory for result, testing result accurately, reliable;
2, overcome the shortcoming of lacking in the easy loose contact of open stich joint, serviceable life, prolonged the serviceable life of coil;
3, improve coil antijamming capability and control accuracy, keeped in repair and maintained easy, easy row.
Description of drawings
Fig. 1 is the loop construction and the operating position synoptic diagram of the embodiment of the invention 1;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the loop construction and the operating position synoptic diagram of the embodiment of the invention 2;
Fig. 4 is the loop construction and the operating position synoptic diagram of the embodiment of the invention 3.
Embodiment
Below in conjunction with accompanying drawing the present invention and embodiment are described in further detail:
Its shape of aerial special-shaped coils of the present invention is dependent on the shape of detected workpiece and size and determines.
Embodiment 1, and being used to detect length is that 3800-4200mm, diameter are the workpiece about 550-650mm, as workpiece such as optical axis and locomotive bent axles.Four by specification be the rectangular frame shape made of the copper bar of 8 * 80mm, its side is L shaped aerial special-shaped coils 3-1, this coil 3-1 is three circles, and is isolated with the thick epoxy resin of 4mm in the bolt junction of every turn-to-turn; The length of above-mentioned rectangle frame and widely be respectively 1380 and 800mm, wherein two of the rectangle frame long edge breaks become L shaped, and the length on L shaped both sides is respectively 820 and 560mm, and L shaped angle is 120 degree.In use, two magnetic heads 2 link to each other by cable 1 with circumferential magnetization transformer T1; Workpiece 4 places between two magnetic heads 2 by anchor clamps; Four L shaped special-shaped coils 3-1 divide two groups to be and to be symmetricly set between two magnetic heads 2, and special-shaped coils 3-1 is placed on outside workpiece 4 and the magnetic head 2, and two special-shaped coils 3-1 of every group link to each other with longitudinal magnetization transformer T2, T3 respectively by after cable 5 parallel connections; During detection, of producing of circumferential magnetization transformer T1 and magnetic head 2 is around workpiece 4 and the longitudinal magnetic field vertical with workpiece 4, and this magnetic field can detect the defective parallel with workpiece 4; The L shaped different coil 3-1 of longitudinal magnetization transformer T2, T3 and four that produce with Circumferential fields workpiece 4 axially parallels, detect and workpiece 4 axial vertical defectives; Longitudinal magnetic field and Circumferential field at the alternating magnetic field superposition of certain angle that staggers on time phase on workpiece 4, its vector is synchronous at workpiece 4 rotating speeds of surface formation and electric current, the elliptical rotating field that the peak value track is relevant with amplitude, workpiece 4 is carried out resultant magnetization, and demonstration can both be scanned to the defective of workpiece 4 surperficial any directions in this magnetic field.
Embodiment 2, are used to detect length and are the workpiece about 500-1200mm, as workpiece such as optical axis and locomotive connecting rod, automobile spring plank bearings.Two by specification be the special-shaped coils 3-3 of the rectangular frame shape made of the copper bar of 6 * 60mm and rectangular frame shape, its side is L shaped special-shaped coils 3-2; Above-mentioned special-shaped coils 3-2,3-3 are three circles, and be isolated with the thick epoxy resin of 4mm in the bolt junction of every turn-to-turn; The special-shaped coils 3-3 of rectangle frame, its wide and height are respectively 350 and 310mm; The length of the rectangle frame of above-mentioned L shaped special-shaped coils 3-2 and wide be 2600 and 350mm, wherein two of the rectangle frame long edge breaks become L shaped, the length on L shaped both sides is respectively 1900 and 700mm, L shaped angle is 105 degree.In use, two magnetic heads 2 link to each other by cable 1 with circumferential magnetization transformer T1; Workpiece 4 places between two magnetic heads 2 by anchor clamps; The special-shaped coils 3-3 of two L-shaped respectively special-shaped coils 3-2 and rectangle frame shape is arranged at two magnetic heads, 2 places respectively, and special-shaped coils 3-2,3-3 are placed on outside workpiece 4 and the magnetic head 2, two special-shaped coils 3-2,3-3 link to each other with longitudinal magnetization transformer T2 by cable 5; During detection, of producing of circumferential magnetization transformer T1 and magnetic head 2 is around workpiece 4 and the longitudinal magnetic field vertical with workpiece 4, and this magnetic field can detect the defective parallel with workpiece 4; Longitudinal magnetization transformer T2 and two different coil 3-2,3-3 that produce with Circumferential fields workpiece 4 axially parallels, detect and workpiece 4 axial vertical defectives; Longitudinal magnetic field and Circumferential field at the alternating magnetic field superposition of certain angle that staggers on time phase on workpiece 4, its vector is synchronous at workpiece 4 rotating speeds of surface formation and electric current, the elliptical rotating field that the peak value track is relevant with amplitude, workpiece 4 is carried out resultant magnetization, and demonstration can both be scanned to the defective of workpiece 4 surperficial any directions in this magnetic field.
Embodiment 3, and the locomotive wheel in irregular shape that is used to detect length and is 2000mm, maximum gauge and be 1200mm is to the gear workpiece.Two by specification be the rectangular frame shape made of the copper bar of 8 * 80mm, its side is special-shaped coils 3-4, the 3-5 of several fonts, above-mentioned coil 3-4,3-5 are three circles, and be isolated with the thick epoxy resin of 4mm in the bolt junction of every turn-to-turn; Wherein two of the rectangle frame long edge breaks become several fonts, the left-falling stroke stroke of several fonts is real in along radially perpendicular stroke of workpiece 4 cams, along the axial horizontal stroke of workpiece 4 be in workpiece 4 terminal outward-dipping left-falling stroke strokes and form, and wherein outward-dipping left-falling stroke stroke radially becomes 15 to spend angles with workpiece 4; The length of the horizontal stroke in top of several fonts should be greater than the width of workpiece 4 cams; The perpendicular folding of several fonts stroke along workpiece 4 cams radially with the axial outside of workpiece 4, and the end of the perpendicular folding of a few font stroke is the edge of a projection.In use, the length overall of the rectangle frame of a few font special-shaped coils 3-4,3-5 that two shapes are identical is respectively 2200 and 2400mm, and three segment length of the left-falling stroke stroke of several fonts are 450,300 and 350mm respectively; The horizontal stroke length in the top of several fonts is respectively 300 and 500mm, and two sections of the perpendicular folding stroke of several fonts are 450 and 250mm respectively, and the height of projection that the end of several font strokes is the edge of a projection is 100mm.Two magnetic heads 2 link to each other by cable 1 with circumferential magnetization transformer T1; Workpiece 4 places between two magnetic heads 2 by anchor clamps; Two special-shaped coils 3-4,3-5 are arranged between two magnetic heads 2 symmetrically, and special-shaped coils 3-4,3-5 are placed on outside workpiece 4 and the magnetic head 2, and a few font special-shaped coils 3-4,3-5 link to each other with longitudinal magnetization transformer T2 by cable 5; During detection, of producing of circumferential magnetization transformer T1 and magnetic head 2 is around workpiece 4 and the longitudinal magnetic field vertical with workpiece 4, and this magnetic field can detect the defective parallel with workpiece 4; Longitudinal magnetization transformer T2 and two different coil 3-4,3-5 that produce with Circumferential fields workpiece 4 axially parallels, detect and workpiece 4 axial vertical defectives; Longitudinal magnetic field and Circumferential field at the alternating magnetic field superposition of certain angle that staggers on time phase on workpiece 4, its vector is synchronous at workpiece 4 rotating speeds of surface formation and electric current, the elliptical rotating field that the peak value track is relevant with amplitude, workpiece 4 is carried out resultant magnetization, and demonstration can both be scanned to the defective of workpiece 4 surperficial any directions in this magnetic field.The left-falling stroke stroke of two a few font special-shaped coils 3-4,3-5 terminal outward-dipping, be convenient to workpiece 4 upper and lower material, though the magnetic field at workpiece 4 two ends relatively a little less than, influential slightly to the magnetization effect, but because the two ends of workpiece 4 have remedied this deficiency near magnetic head 2, and the end of the perpendicular folding of several fonts stroke is the edge of a projection, makes Distribution of Magnetic Field more even.
Claims (3)
1, the aerial special-shaped coils of magnaflux, it is characterized in that: when being used to detect length and being the workpiece of 3800-4200mm, comprise four rectangular frame shapes of making by copper bar, its side is L shaped special-shaped coils, the long edge break of above-mentioned rectangle frame becomes L shaped, L shaped angle is 120 degree.
2, the aerial special-shaped coils of magnaflux is characterized in that: be used to detect the workpiece that length is 500-1200mm, comprise the special-shaped coils of two rectangular frame shapes of making by copper bar and rectangular frame shape, its side is L shaped special-shaped coils; Two long edge breaks of the rectangle frame of above-mentioned L shaped special-shaped coils become L shaped, and L shaped angle is 105 degree.
3, the aerial special-shaped coils of magnaflux, it is characterized in that: the out-of-shape locomotive wheel that is used to detect length and is 2000mm, maximum gauge and be 1200mm is to the gear workpiece, comprise the rectangular frame shape of making by copper bar that two shapes are identical, its side is the special-shaped coils of several fonts; Wherein two of the rectangle frame long edge breaks become several fonts, the left-falling stroke stroke of several fonts real for along radially perpendicular stroke of workpiece cam, along workpiece spindle to horizontal stroke and be in the outward-dipping left-falling stroke stroke of workpiece end and form, wherein outward-dipping left-falling stroke stroke radially becomes 15 to spend angles with workpiece; The horizontal stroke length in the top of several fonts should be greater than the width of workpiece cam; The perpendicular folding of several fonts stroke be along the workpiece cam radially with the axial outside of workpiece, and the perpendicular end of rolling over stroke of a few font is the edge of a projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111498 CN1117276C (en) | 1998-09-15 | 1998-09-15 | Overhead specially-shaped coil for magnetic-powder flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98111498 CN1117276C (en) | 1998-09-15 | 1998-09-15 | Overhead specially-shaped coil for magnetic-powder flaw detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1247980A CN1247980A (en) | 2000-03-22 |
| CN1117276C true CN1117276C (en) | 2003-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98111498 Expired - Fee Related CN1117276C (en) | 1998-09-15 | 1998-09-15 | Overhead specially-shaped coil for magnetic-powder flaw detector |
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| CN (1) | CN1117276C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949890B (en) * | 2010-07-27 | 2012-01-11 | 上海诚友实业集团有限公司 | Longitudinal magnetizing device for crankshaft magnetizing machine |
| CN104330463A (en) * | 2013-07-22 | 2015-02-04 | 李俊生 | Four-way magnetizing magnetic powder inspection apparatus |
| CN104316595B (en) * | 2014-11-17 | 2017-09-08 | 马钢(集团)控股有限公司 | A kind of magnetization unit of wheel magnaflux |
| CN106024268B (en) * | 2016-06-28 | 2018-06-05 | 国营芜湖机械厂 | A kind of axis class small part longitudinal magnetizing device |
| CN107389784B (en) * | 2017-07-27 | 2021-01-05 | 中车戚墅堰机车车辆工艺研究所有限公司 | Combined magnetizing coil and non-disassembly state shaft gear magnetic powder detection device and method |
| CN107561155A (en) * | 2017-09-26 | 2018-01-09 | 王枫 | Special-shaped coils wheel is to magnetic powder inspection device |
| CN110057906B (en) * | 2019-05-23 | 2024-05-03 | 南京师范大学泰州学院 | Quick detection device for cracks of metal pipeline workpiece |
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1998
- 1998-09-15 CN CN 98111498 patent/CN1117276C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1247980A (en) | 2000-03-22 |
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Owner name: YANCHENG YUEXINGDA ELECTRIC MANUFACTURING CO., LT Free format text: FORMER OWNER: YANCHENG CITY ELECTRONIC EQUIPMENT FACTORY Effective date: 20031114 |
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Effective date of registration: 20031114 Address after: 224005 new County, Jiangsu Province Patentee after: Yancheng Xingda Yi Electrical Appliance Manufacturing Co. Ltd Address before: 224003 No. 23 North Tongyu Road, Jiangsu, Yancheng City Patentee before: Yancheng City Electronic Equipment Factory |
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