CN107490619B - Miniature magnetic leakage detector probe - Google Patents
Miniature magnetic leakage detector probe Download PDFInfo
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- CN107490619B CN107490619B CN201610409939.2A CN201610409939A CN107490619B CN 107490619 B CN107490619 B CN 107490619B CN 201610409939 A CN201610409939 A CN 201610409939A CN 107490619 B CN107490619 B CN 107490619B
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- metal block
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- end metal
- soft magnet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/87—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using probes
Abstract
The invention is suitable for the field of nondestructive testing, and provides a miniature magnetic flux leakage detector probe which comprises a front end metal block, a soft magnet and a rear end metal block which are fixed into a whole, wherein front rollers are arranged on two sides of the front end metal block, the rear end metal block is provided with a rear roller, a notch is formed in the rear end metal block from the bottom to the top, a photoelectric encoder is placed in the notch, an n-shaped fixed metal block is further fixed below the soft magnet, permanent magnets are fixed at the bottom of the soft magnet and between the fixed metal block and the front end metal block and the rear end metal block, an n-shaped sensor base is further fixed in the notch in the bottom of the fixed metal block, a pair of sliding grooves are further formed in the inner wall of the sensor base, and a sensor circuit board is inserted between the sliding grooves. The probe of the miniature magnetic flux leakage detector provided by the invention is simple in design, compact in structure, convenient to carry and operate due to the adoption of a miniature design, and is particularly suitable for detecting small plates or pipelines.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a probe of a miniature magnetic flux leakage detector.
Background
The leakage flux detection technique detects defects by detecting leakage of magnetic flux. The principle is to use the flux leakage caused by the discontinuity of permeability due to defects in the ferromagnetic object to be detected. Compared with other defect detection technologies, such as magnetic powder, eddy current and the like, the magnetic leakage detection technology has a deep detection depth, and can detect a depth of 20 mm. In special cases, the magnetic flux leakage detection technique can be used to detect the reverse side of an object to be inspected, such as the lower surface of a tank floor, the outer surface of a pipeline during internal inspection, the inner surface of a pipeline during external inspection, and the like.
In view of the maturity and effectiveness of the magnetic leakage detection technology, it has become a national standard for nondestructive testing. In general, the embodiment is in a power-driven or manual mode, and is made into a relatively large instrument. The large-scale magnetic flux leakage detecting instrument can exert the maximum effect on a storage tank bottom plate, or a large-scale steel plate, a long-distance pipeline and the like. However, these existing large instruments are not suitable for small pipes or flat panels.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a probe of a miniature magnetic flux leakage detector, which aims to solve the technical problem that the existing magnetic flux leakage detector is inconvenient to detect small pipes or flat plates.
The invention adopts the following technical scheme:
the miniature magnetic leakage detector probe comprises a front end metal block, a soft magnet and a rear end metal block which are fixed into a whole, wherein the soft magnet is located at an intermediate position, front idler wheels are arranged on two sides of the front end metal block, the rear end metal block is provided with a rear idler wheel, a notch is formed in the bottom of the rear end metal block in an upward mode, a photoelectric encoder is placed in the notch, an n-shaped fixed metal block is further fixed below the soft magnet, a permanent magnet is fixed at the bottom of the soft magnet and between the fixed metal block and the front end rear end metal block, an n-shaped sensor base is further fixed in a groove in the bottom of the fixed metal block, a pair of sliding grooves are further formed in the inner wall of the sensor base, a sensor circuit board is inserted between the sliding grooves, and the photoelectric encoder is connected with the sensor circuit board through a wire.
Further, a handle is arranged at the top of the soft magnet.
Furthermore, two ends of the soft magnet extend downwards to form small steps, the permanent magnet is located below the small steps, the fixed metal block is located between the two small steps, each small step is provided with a counter bore, a screw penetrates into each counter bore, and then the counter bores are screwed and fixed to the bottom of the handle.
Furthermore, a row of big screw holes are formed in the middle of the bottom of the soft magnet, a row of small screw holes are formed in the two sides of each big screw hole, aligning holes corresponding to the positions of the small screw holes are further formed in the top of the fixed metal block, and each aligning hole penetrates through a screw and is screwed into the corresponding small screw hole, so that the fixed metal block is fixed to the bottom of the soft magnet.
Furthermore, an opening is formed in the middle of the top of the fixed metal block, a fixed hole is formed in the top of the sensor base, a screw penetrates through the fixed hole, then the fixed hole penetrates through the opening, and finally the large screw hole in the corresponding position is screwed in to fix the sensor base.
Furthermore, a first transverse groove is formed in a small step close to the rear end metal block, a second transverse groove is formed in the top of the fixed metal block and communicated with the opening, the first transverse groove and the second transverse groove are located on the same straight line, a wire hole is further formed in the top of the sensor base, and a sensor circuit board is connected to the photoelectric encoder through the wire hole, the opening, the second transverse groove, the first transverse groove and a notch of the rear end metal block in sequence.
Furthermore, both sides of the top of the sensor base are in a chamfered shape.
Furthermore, a connector lead is led out of the sensor circuit board and directly extends out of the lower portion of the sensor base, the connector lead is fixed on the soft magnet through a metal pressing sheet, and a metal plate protective sleeve made of nonmagnetic metal plates is further arranged on the periphery of the whole miniature magnetic flux leakage detector probe.
Furthermore, countersunk screw holes are formed in the end surfaces of the front end metal block and the rear end metal block, and screws penetrate through the countersunk screw holes and are fixed to the soft magnet; the rear end metal block is provided with a pair of dead eye, installs the bearing in every dead eye, has placed a metal axle in two bearings, and two back for the gyro wheel screw fixation the both ends of metal axle, photoelectric encoder's code disc is fixed in the centre of metal axle, photoelectric encoder's detection head installs on the grooved inner wall in rear end metal block bottom, the both ends of metal axle, between bearing and back gyro wheel, respectively have a jump ring groove for the lateral sliding of restriction metal axle.
Furthermore, the bottom surface of miniature magnetic leakage detector probe can be the plane, also can make the curved surface, when needs make the curved surface form, the permanent magnet adds the curved surface magnetic pole, is convenient for switch on of excitation magnetic flux, and remaining surface, including front end metal block, rear end metal block, fixed metal block, sensor base, panel beating protective sheath, need adapt to the curved surface camber equally for its curved surface camber coincide with the object surface that awaits measuring.
The invention has the beneficial effects that: the probe of the miniature magnetic flux leakage detector provided by the invention is simple in design, compact in structure, convenient to carry and operate due to the adoption of a miniature design, and is particularly suitable for detecting small plates or pipelines.
Drawings
Fig. 1 is a structural diagram of a probe of a miniature magnetic flux leakage detector according to an embodiment of the present invention.
FIG. 2 is a bottom view of a probe of the miniature magnetic flux leakage detector;
FIG. 3 is a block diagram of a soft magnetic body;
FIG. 4 is a structural view of a stationary metal block;
fig. 5 is a structural view of a sensor base.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in fig. 1 and 2, the miniature magnetic leakage detector probe that this embodiment provided, including fixed front end metal block 1, soft magnet 2 and the rear end metal block 3 as an organic whole, soft magnet 2 is in the intermediate position, 1 both sides of front end metal block are provided with preceding gyro wheel 11, rear end metal block 3 is provided with rear roller 31, rear end metal block has upwards opened the notch from the bottom, photoelectric encoder (not shown in the figure) has been placed in the notch, soft magnet 2 below still is fixed with the fixed metal block 4 of n shape, and the n shape is just the shape of falling the U, and is the same down. The bottom of the soft magnet 2 and the position between the fixed metal block 4 and the front end and rear end metal blocks are both fixed with a permanent magnet 5, an n-shaped sensor base 6 is further fixed in a groove in the bottom of the fixed metal block 4, the inner wall of the sensor base 6 is further provided with a pair of sliding grooves 61, a sensor circuit board (not shown in the figure) is inserted between the sliding grooves 61, and the photoelectric encoder is connected with the sensor circuit board through a lead. In addition, preferably, a handle 7 is further arranged at the top of the soft magnet 2, and the whole probe is conveniently taken up through the handle 7.
In the structure, the front end metal block, the rear end metal block and the fixed metal block are made of duralumin or other nonmagnetic metal materials, and the sensor base is made of soft magnetic materials. The soft magnet and the permanent magnet are fixed between the front-end aluminum block and the rear-end aluminum block, and the soft magnet is made of soft magnetic materials and has the function of forming an external magnetic circuit of the excitation part. The front end metal block and the rear end metal block are fixed with the soft magnet into a whole, the soft magnet forms a mechanical part main body of the integral probe, and the rest parts are generally directly or indirectly connected to the soft magnet. As a fixing mode, countersunk screw holes are formed in the end faces of the front end metal block and the rear end metal block, and penetrate through screws and are fixed to the soft magnet. The front idler wheel is covered with plastic and is directly fixed on the front end metal block through a bolt. On the whole, the front end metal block plays a preceding gyro wheel support effect, and the front end metal block still plays the effect of protection and fixed permanent magnet in the back simultaneously. The fixed metal block has two main functions: the first is to limit the position of the permanent magnet, and the second is to provide a fixed position surface for the sensor base.
The rear end metal block lower part is provided with a pair of dead eye, installs the bearing in every dead eye, has placed a metal axle 31 in two bearings, and two for the back gyro wheel the screw fixation be in the both ends of metal axle, photoelectric encoder's coding disc is fixed in the centre of metal axle, photoelectric encoder's detection head is installed on the grooved inner wall in rear end metal block bottom. In addition, preferably, two ends of the metal shaft are respectively provided with a clamp spring groove between the bearing and the rear roller, the clamp spring grooves are used for fixing the transverse sliding of the metal shaft, the distance between the rear roller and the rear end metal block is kept, and meanwhile, an encoding disc of the encoder is prevented from touching a detection head of the encoder.
The device has compact structure, adopts the miniaturization design, can be smaller in the whole size for convenient carrying, is convenient to operate, and is suitable for detecting small-sized plates or pipelines.
As a specific structure of the soft magnet 2, as shown in fig. 3, two ends of the soft magnet 2 extend downwards to form a small step 21, the permanent magnet 5 is located below the small step 21, the fixed metal block 4 is located right between the two small steps 21, and the small step 21 plays a role in limiting the fixed metal block 4. Each small step 21 is provided with a counter bore 22, a screw is inserted into the counter bore 22 and then screwed and fixed to the bottom of the handle 7, and therefore the mounting of the handle is achieved. A row of big screw holes 23 are formed in the middle of the bottom of the soft magnet 2, a row of small screw holes 24 are formed in the two sides of each big screw hole 23, in the drawing, the number of the big screw holes 23 is 2, and the number of the small screw holes in the right two rows is 4. Here, two large screw holes 23 are used for fixing the sensor base, and the remaining four small screw holes are used for installing and fixing the metal block. Specifically, with reference to the structure of the fixed metal block 4 shown in fig. 4, the top of the fixed metal block 4 is further provided with 4 alignment holes 41 corresponding to the positions of the small screw holes 24, and each alignment hole 4 is penetrated by a screw and screwed into the corresponding small screw hole 24, so that the fixed metal block 4 is fixed to the bottom of the soft magnet 2.
In fig. 4, the fixing metal block 4 is also provided with a relatively large-sized opening 42 in the middle of the top, which is used for facilitating the fixing of the sensor base below the opening and accommodating the redundant wires of the photoelectric encoder. With reference to the structure of the sensor base shown in fig. 5, the top of the sensor base 6 is provided with a fixing hole 62, and a screw is inserted into the fixing hole 62, passes through the opening 42, and is finally screwed into the large screw hole 23 at the corresponding position, so that the sensor base 4 is fixed. In addition, both sides of the top of the sensor base are made into a shape of a chamfered edge, and the main purpose is to reduce the absorption of an external leakage magnetic field of an excitation part.
In addition, a first transverse groove 25 is formed in the small step close to the rear end metal block 3, a second transverse groove 43 is formed in the top of the fixed metal block 4, the second transverse groove 43 is communicated with the opening 42, the first transverse groove 25 and the second transverse groove 43 are located on the same straight line, a wire guide hole 63 is further formed in the top of the sensor base 6, and a sensor circuit board is connected to the photoelectric encoder through wires sequentially passing through the wire guide hole 63, the opening 42, the second transverse groove 43, the first transverse groove 25 and the notch of the rear end metal block.
The sensor circuit board is also led out with a connector lead which directly extends out from a slot below the sensor base, and the connector lead is fixed on the soft magnet 2 through a metal pressing sheet 26. Preferably, a metal plate protective sleeve made of a nonmagnetic metal plate is further arranged on the periphery of the probe of the whole miniature magnetic flux leakage detector, so that components such as a permanent magnet and a magnetic sensor are further protected.
It should be noted that, although the bottom of the probe of the miniature magnetic flux leakage detector shown in the drawings in the specification is planar, for a regular curved surface such as a small pipeline, the bottom of the probe can be changed into a curved surface form without changing the structural concept of the invention, which is convenient for curved surface detection. The permanent magnet needs to be additionally provided with a curved magnetic pole, so that the conduction of the excitation magnetic flux is facilitated. The rest surfaces, such as the front-end aluminum block, the thickness aluminum block, the fixed aluminum block, the sensor base, the sensor circuit board, the metal plate protective sleeve and the like, are also adapted to the curvature of the curved surface and matched with the surface of the object to be detected as much as possible.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A probe of a miniature magnetic leakage detector is characterized by comprising a front end metal block, a soft magnet and a rear end metal block which are fixed into a whole, wherein the soft magnet is arranged in the middle position, front rollers are arranged on two sides of the front end metal block, the rear end metal block is provided with a rear roller, a notch is formed in the rear end metal block from the bottom upwards, a photoelectric encoder is placed in the notch, an n-shaped fixed metal block is further fixed below the soft magnet, permanent magnets are fixed at the bottom of the soft magnet and between the fixed metal block and the front end metal block and the rear end metal block, an n-shaped sensor base is further fixed in the notch in the bottom of the fixed metal block, a pair of sliding grooves are further formed in the inner wall of the sensor base, a sensor circuit board is inserted between the sliding grooves, and the photoelectric encoder is connected with the sensor circuit board through a lead, the top of the soft magnet is also provided with a handle, two ends of the soft magnet extend downwards to form a small step, the permanent magnet is positioned below the small step, the fixed metal block is positioned between the two small steps, each small step is provided with a counter bore, a screw penetrates through the counter bore and is screwed and fixed to the bottom of the handle, the middle position of the bottom of the soft magnet is provided with a row of large screw holes, two sides of each large screw hole are respectively provided with a row of small screw holes, the top of the fixed metal block is also provided with an alignment hole corresponding to the position of the small screw hole, each alignment hole penetrates through the screw and is screwed into the corresponding small screw hole, so that the fixed metal block is fixed to the bottom of the soft magnet, the middle of the top of the fixed metal block is also provided with an opening, the top of the sensor base is provided with a fixed hole, a screw penetrates through the fixed hole and finally penetrates through the opening and is screwed into the large screw, the sensor comprises a sensor base, a small step, a first transverse groove, a second transverse groove, a wire hole and a sensor circuit board, wherein the small step is close to a rear end metal block, the first transverse groove is formed in the top of the fixed metal block, the second transverse groove is communicated with an opening, the first transverse groove and the second transverse groove are located on the same straight line, the wire hole, the opening, the second transverse groove, the first transverse groove and the notch of the rear end metal block are connected to the photoelectric encoder in sequence through the wire hole, the opening, the first transverse groove and the sensor circuit board.
2. The probe of claim 1, wherein the sensor base has chamfered edges on both sides of the top portion.
3. The probe of claim 2, wherein the sensor circuit board further has a connector lead extending from a lower portion of the sensor base, the connector lead is fixed to the soft magnetic body by a metal pressing sheet, and a metal sheet protective sleeve made of a non-magnetic metal sheet is further disposed around the entire probe of the micro magnetic leakage detector.
4. The probe of the micro magnetic flux leakage detector according to any one of claims 1 to 3, wherein countersunk screw holes are formed on the end surfaces of the front end metal block and the rear end metal block, and the countersunk screw holes penetrate through screws and are fixed on the soft magnet; the rear end metal block is provided with a pair of dead eye, installs the bearing in every dead eye, has placed a metal axle in two bearings, and two back for the gyro wheel screw fixation the both ends of metal axle, photoelectric encoder's code disc is fixed in the centre of metal axle, photoelectric encoder's detection head installs on the grooved inner wall in rear end metal block bottom, the both ends of metal axle, between bearing and back gyro wheel, respectively have a jump ring groove for the lateral sliding of restriction metal axle.
5. The probe of any one of claims 1 to 3, wherein the bottom surface of the probe of the micro magnetic flux leakage detector is a flat surface or a curved surface, when the probe needs to be made into a curved surface form, the permanent magnet is additionally provided with a curved magnetic pole to facilitate conduction of the excitation magnetic flux, and the rest surfaces, including the front end metal block, the rear end metal block, the fixed metal block and the sensor base, also need to adapt to the curvature of the curved surface, so that the curvature of the curved surface is matched with the surface of the object to be detected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610409939.2A CN107490619B (en) | 2016-06-12 | 2016-06-12 | Miniature magnetic leakage detector probe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610409939.2A CN107490619B (en) | 2016-06-12 | 2016-06-12 | Miniature magnetic leakage detector probe |
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| CN107490619A CN107490619A (en) | 2017-12-19 |
| CN107490619B true CN107490619B (en) | 2021-02-05 |
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| CN201610409939.2A Active CN107490619B (en) | 2016-06-12 | 2016-06-12 | Miniature magnetic leakage detector probe |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109884172A (en) * | 2019-04-12 | 2019-06-14 | 中国石油化工股份有限公司 | A kind of excitation structure for plate Magnetic Flux Leakage Inspecting |
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| US5442287A (en) * | 1993-05-03 | 1995-08-15 | Tuboscope Vetco (Deutschland) Gmbh | Method and apparatus for detecting magnetic discontinuities by inducing a magnetic field in a magnetizable sample |
| CN2842418Y (en) * | 2005-05-25 | 2006-11-29 | 大庆石油学院 | Walking rack of small ferromagnetic flat corrosion defect magnetic-leakage detector |
| CN201417262Y (en) * | 2009-07-02 | 2010-03-03 | 戴光 | Hand-operated and power-operated integrated magnetic leakage detector for storage tank bottom plate |
| CN201548519U (en) * | 2009-11-10 | 2010-08-11 | 大庆石油学院 | Wall-climbing magnetic leakage scanning detector for storage tank wallboard |
| CN201859139U (en) * | 2010-08-07 | 2011-06-08 | 东北石油大学 | Magnetic leakage detection magnetizer for storage tank soleplate based on excitation of direct current coil |
| CN103698390A (en) * | 2013-12-18 | 2014-04-02 | 浙江省特种设备检验研究院 | Defect and magnetic leakage detection device for underground oil storage tank |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201105193D0 (en) * | 2011-03-29 | 2011-05-11 | Silverwing Uk Ltd | Methods and apparatus for the inspection of plates and pipe walls |
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2016
- 2016-06-12 CN CN201610409939.2A patent/CN107490619B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5442287A (en) * | 1993-05-03 | 1995-08-15 | Tuboscope Vetco (Deutschland) Gmbh | Method and apparatus for detecting magnetic discontinuities by inducing a magnetic field in a magnetizable sample |
| CN2842418Y (en) * | 2005-05-25 | 2006-11-29 | 大庆石油学院 | Walking rack of small ferromagnetic flat corrosion defect magnetic-leakage detector |
| CN201417262Y (en) * | 2009-07-02 | 2010-03-03 | 戴光 | Hand-operated and power-operated integrated magnetic leakage detector for storage tank bottom plate |
| CN201548519U (en) * | 2009-11-10 | 2010-08-11 | 大庆石油学院 | Wall-climbing magnetic leakage scanning detector for storage tank wallboard |
| CN201859139U (en) * | 2010-08-07 | 2011-06-08 | 东北石油大学 | Magnetic leakage detection magnetizer for storage tank soleplate based on excitation of direct current coil |
| CN103698390A (en) * | 2013-12-18 | 2014-04-02 | 浙江省特种设备检验研究院 | Defect and magnetic leakage detection device for underground oil storage tank |
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