CN112858467A - Rotating electromagnetic field pipeline crack detection probe and detection system in any direction - Google Patents
Rotating electromagnetic field pipeline crack detection probe and detection system in any direction Download PDFInfo
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- CN112858467A CN112858467A CN202110380505.5A CN202110380505A CN112858467A CN 112858467 A CN112858467 A CN 112858467A CN 202110380505 A CN202110380505 A CN 202110380505A CN 112858467 A CN112858467 A CN 112858467A
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- 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
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Abstract
The invention provides a detection probe and a detection system for cracks of a rotating electromagnetic field pipeline in any direction, wherein sinusoidal signals with consistent frequency and amplitude and 90-degree phase difference are conducted on two coils which are orthogonally distributed, and an exciting coil induces a rotating uniform electromagnetic field on a detected pipeline, wherein the rotating uniform electromagnetic field has the same detection sensitivity for the cracks in any direction, so that the defect that the traditional alternating current electromagnetic field is only sensitive to the cracks vertical to induced current is overcome; meanwhile, the exciting coil is two layers of flexible PCB boards which are attached in the arc-shaped groove of the probe shell, compared with the exciting coil of the traditional pipeline detection probe, the flexible PCB boards do not need to be wound by enameled wires, can flexibly change radian and can adapt to pipelines with different pipe diameters; the detection probe adopts a half-wrapped structure, can realize the detection of the pipeline under the condition that the pipeline has a joint or is connected with other pipelines, and enlarges the application range of the rotating electromagnetic field detection technology.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to a rotating electromagnetic field pipeline crack detection probe and a detection system in any direction.
Background
The pipeline is widely applied to the fields of petroleum and petrochemical industry, nuclear power and the like as an important part, but the pipeline is easily affected by factors such as complex load, corrosive media and the like, so that the pipeline is easy to generate defects such as cracks in all directions and the like. If the cracks cannot be detected and repaired in time, the cracks can be continuously expanded to further cause structural failure, oil gas leakage, explosion and other accidents, and great threat is brought to life and property safety of people.
The alternating current electromagnetic field is a novel nondestructive testing technology, and is widely applied to pipeline detection due to the advantages of no need of removing a surface coating, insensitivity to lift-off, high quantitative precision, mathematical model precision and the like.
However, the existing alternating current electromagnetic field detection technology induces a uniform electromagnetic field in a single direction on the surface of a measured object, is only sensitive to cracks perpendicular to the induced current direction, and has detection sensitivity influenced by the crack direction and the scanning direction; the conventional alternating current magnetic field pipeline detection probe is mostly of an externally-penetrating type, only delivery detection of the pipeline can be realized, and once the pipeline is provided with a joint or is connected with other pipelines, the externally-penetrating type probe cannot realize detection of the pipeline; the loop of the semi-wrapped probe exciting coil is in a semicircular ring shape, so that the winding of the exciting coil is difficult, the manufacturing and detection precision of the detection probe is further influenced, and a specific exciting coil needs to be wound again every time a pipeline with one outer diameter is replaced.
Disclosure of Invention
The invention provides a rotating electromagnetic field pipeline crack detection probe and a detection system in any direction.
The invention provides a rotating electromagnetic field pipeline crack detection probe and detection system in any direction, which comprises:
in a first aspect, the present application provides a probe for detecting cracks in any direction of a rotating electromagnetic field pipeline, which is characterized by comprising: the device comprises a probe shell, a magnetic field sensor and an exciting coil; the probe shell is of a pipeline half-wrapping structure, an arc-shaped groove is formed in the outer side of the probe shell, a plurality of small grooves distributed in the circumferential direction are formed in the axial center of the arc-shaped groove, the small grooves are distributed in the circumferential center area of the arc-shaped groove, and the radian of the center area is not more than 1/3 of the radian of the arc-shaped groove; the magnetic field sensor is arranged in the small groove; the exciting coil is printed on the two layers of flexible PCB boards and attached to the arc-shaped groove; the upper-layer coil and the lower-layer coil are respectively printed on the upper layer and the lower layer of the flexible PCB, the upper-layer coil and the lower-layer coil are respectively composed of two rectangular coils which are symmetrically distributed, the winding directions of the two rectangular coils are opposite, and other parameters of the two rectangular coils are consistent with the connected excitation signal; meanwhile, the upper coil and the lower coil are distributed in an orthogonal mode, and excitation signals of the upper coil and the lower coil are sinusoidal signals with equal amplitude and frequency and 90-degree phase difference
Further, a rectangular groove is formed in the probe shell and connected with the small groove together for passing through a signal wire; the front end of the probe shell is provided with a semicircular groove, the semicircular groove is used for storing signal lines, a joint hole is formed in the upper portion of the semicircular groove, a circular protrusion is formed in the back of the semicircular groove, and the front end and the rear end of the probe shell are provided with connecting holes.
The probe shell is characterized by further comprising a protective cover, the protective cover is integrally semicircular, a groove in the middle of the protective cover is used for allowing a signal line to pass through, the front end of the protective cover is pressed by the circular ring-shaped bulge of the probe shell, and a connecting hole is formed in the rear end of the protective cover.
Further, the probe cover is further included, and a connecting hole is formed in the probe cover.
Further, the connector is installed on the connector hole of the probe shell.
Further, the probe cover comprises a connecting device, the connecting device connects the probe shell and the protective cover together through a connecting hole, and the connecting device connects the probe shell and the probe cover together through the connecting hole.
In a second aspect, the application provides a system for detecting cracks of a rotating electromagnetic field pipeline in any direction, which comprises a signal generator, a power amplifier, a phase-locked amplifier, a data acquisition module and an upper computer; the probe is characterized by further comprising a rotating electromagnetic field pipeline crack detection probe in any direction as claimed in any claim 1-6, wherein the signal generator is connected with the power amplifier, the power amplifier is connected with the exciting coil, the phase-locked amplifier is connected with the magnetic field sensor and the signal generator, the signal acquisition module is connected with the phase-locked amplifier, and the upper computer is connected with the signal acquisition module.
Furthermore, the signal generator produces 2 routes of sinusoidal signals with 90-degree initial phase difference, the sinusoidal signals are loaded into the exciting coil through the power amplifier, the magnetic field signal in the space is picked up by the magnetic field sensor and converted into an electric signal, the input signal of the phase-locked amplifier is the electric signal of the magnetic field sensor, the reference signal of the phase-locked amplifier is any one route of the 2 routes of sinusoidal signals generated by the signal generator, the output signal of the phase-locked amplifier is collected by the signal collection module and finally transmitted to the upper computer, and the upper computer processes the signals collected by the signal collection module.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that:
by passing sinusoidal signals with the same frequency and amplitude and the phase difference of 90 degrees on two orthogonally distributed coils, the exciting coil induces a rotating uniform electromagnetic field on the measured pipeline, and the rotating electromagnetic field has the same detection sensitivity on cracks in any direction, thereby overcoming the defect that the traditional alternating current electromagnetic field is only sensitive to the cracks vertical to the induced current; meanwhile, the exciting coil is two layers of flexible PCB boards which are attached in the arc-shaped groove of the probe shell, compared with the exciting coil of the traditional pipeline detection probe, the flexible PCB boards do not need to be wound by enameled wires, can flexibly change radian and can adapt to pipelines with different pipe diameters; the detection probe adopts a half-wrapped structure, can realize the detection of the pipeline under the condition that the pipeline has a joint or is connected with other pipelines, and enlarges the application range of the rotating electromagnetic field detection technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an overall view of a crack detection probe for any direction of a pipeline in an embodiment of the present application;
FIG. 2 is an exploded view of a crack detection probe for any direction of a pipeline in an embodiment of the present application;
FIG. 3 is a schematic front view of a probe housing according to an embodiment of the present disclosure;
FIG. 4 is a schematic side view of a probe housing according to an embodiment of the present application;
FIG. 5 is a schematic diagram of an exciting coil structure in the embodiment of the present application;
FIG. 6 is a schematic diagram of an upper coil structure of an excitation coil in an embodiment of the present application;
FIG. 7 is a diagram illustrating a lower layer coil structure of an excitation coil according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a protective cover according to an embodiment of the present disclosure;
FIG. 9 is a schematic view of a crack detection system for any direction of a pipeline in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
The technical means shown in the present application will be described in detail below with reference to specific examples. It should be noted that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.
Example 1
The application provides a rotatory electromagnetic field pipeline arbitrary direction crack detection probe, as shown in fig. 2, its characteristic includes: the probe shell 10, the magnetic field sensor 20 and the exciting coil 30; as shown in fig. 3 and 4, the probe shell 10 is of a pipeline half-wrapping structure, and can realize detection of a pipeline under the condition that a joint is formed on the pipeline or the pipeline is connected with other pipelines, an arc-shaped groove 101 is formed in the outer side of the probe shell 10, a plurality of small grooves 102 which are circumferentially distributed are formed in the axial central position of the arc-shaped groove 101, the small grooves 102 are distributed in the circumferential central area of the arc-shaped groove 101, and the radian of the central area is not more than 1/3 of the radian of the arc-shaped groove 101; the magnetic field sensor 20 is mounted in the small groove 102; the exciting coil 30 is two layers of flexible PCB boards, and is attached to the arc-shaped groove 101 of the probe shell 10, compared with the exciting coil of a half-wrapped detection probe, the flexible PCB boards do not need to be wound by enameled wires, can flexibly change radian, and do not need to be manufactured again for the detection of pipelines with different pipe diameters; compared with the conventional double-U-shaped rotating electromagnetic field excitation, the double-U-shaped rotating electromagnetic field excitation device does not need a magnetic core, the rotating electromagnetic field strength induced on the pipeline is more uniform, and the sensitivity of crack detection is higher; the upper-layer coil 301 and the lower-layer coil 302 are respectively printed on the upper layer and the lower layer of the flexible PCB, the upper-layer coil 301 and the lower-layer coil 302 are respectively composed of two rectangular coils which are symmetrically distributed, the winding directions of the two rectangular coils are opposite, other parameters of the two rectangular coils are consistent with the connected excitation signals, so that the current directions of the two rectangular coils are opposite, one is clockwise, the other is anticlockwise, and a uniform electromagnetic field is induced at the middle position of the two rectangular coils; meanwhile, the upper coil 301 and the lower coil 302 of the PCB are orthogonally distributed, electromagnetic fields of the two coils are superposed in a vector manner, excitation signals of the upper coil 301 and the lower coil 302 of the PCB are sinusoidal signals with equal amplitude and frequency and 90-degree phase difference, after the signals are switched on, the excitation coils induce a uniform rotating electromagnetic field on a structure to be detected, and the rotating electromagnetic field has the same detection sensitivity to cracks in any direction.
Further, a rectangular groove 103 is formed in the probe shell 10, and is connected with the small groove 102 for passing through a signal line; the front end of the probe shell 10 is provided with a semicircular groove 104, the semicircular groove 104 is used for storing signal lines, a connector hole 105 is arranged above the semicircular groove 104, a circular protrusion 106 is arranged behind the semicircular groove, and the front end and the rear end of the probe shell are both provided with connecting holes 107.
Further, the protective cover 40 is integrally semicircular, the groove 401 in the middle of the protective cover is used for passing a signal line, the front end of the protective cover 40 is pressed by the circular ring-shaped protrusion 106 to play a role in fixing the protective cover and avoid the protective cover from tilting, the rear end of the protective cover is provided with the connecting hole 402, and the probe cover is used for protecting the excitation coil from being damaged by an external structure.
Further, the device also comprises a probe cover 60, and the probe cover 60 is provided with a connecting hole.
Further, the probe comprises a connector 50, and the connector 50 is mounted on a connector hole 105 of the probe shell 10.
Further, a connecting device 70 is included, the connecting device 70 connects the probe housing 10 and the protective cover 40 together through a connecting hole, and the connecting device 70 connects the probe housing 10 and the probe cover 60 together through a connecting hole.
Example 2
The embodiment 2 of the application also provides a system for detecting cracks of a rotating electromagnetic field pipeline in any direction, which comprises a signal generator, a power amplifier, a phase-locked amplifier, a data acquisition module and an upper computer; the probe for detecting the cracks in any direction of the rotating electromagnetic field pipeline in the embodiment 1 is further included, the signal generator is connected with the power amplifier, the power amplifier is connected with the exciting coil, the phase-locked amplifier is connected with the magnetic field sensor and the signal generator, the signal acquisition module is connected with the phase-locked amplifier, and the upper computer is connected with the signal acquisition module.
Furthermore, the signal generator produces 2 routes of sinusoidal signals with 90-degree initial phase difference, the sinusoidal signals are loaded into the exciting coil through the power amplifier, the magnetic field signal in the space is picked up by the magnetic field sensor and converted into an electric signal, the input signal of the phase-locked amplifier is the electric signal of the magnetic field sensor, the reference signal of the phase-locked amplifier is any one route of the 2 routes of sinusoidal signals generated by the signal generator, the output signal of the phase-locked amplifier is collected by the signal collection module and finally transmitted to the upper computer, and the upper computer processes the signals collected by the signal collection module.
The structure, function and function of the probe for detecting cracks in any direction of the rotating electromagnetic field pipeline are described in detail in the foregoing embodiments, and are not described in detail herein.
Other components of a rotating electromagnetic field pipeline crack detection probe and detection system in any direction are well known to those skilled in the art, and reference is made to the prior art in the field, and detailed description is not provided herein.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A rotating electromagnetic field pipeline arbitrary direction crack detection probe, its characteristic includes: the probe shell 10, the magnetic field sensor 20 and the exciting coil 30; the probe shell 10 is of a pipeline half-wrapping structure, an arc-shaped groove 101 is formed in the outer side of the probe shell 10, a plurality of small grooves 102 which are circumferentially distributed are formed in the axial center position of the arc-shaped groove 101, the small grooves 102 are distributed in the circumferential center area of the arc-shaped groove 101, and the radian of the center area is not more than 1/3 of the radian of the arc-shaped groove 101; the magnetic field sensor 20 is mounted in the small groove 102; the exciting coil 30 is printed on the two layers of flexible PCB boards and attached in the arc-shaped groove 101; the upper-layer coil 301 and the lower-layer coil 302 are respectively printed on the upper layer and the lower layer of the flexible PCB, the upper-layer coil 301 and the lower-layer coil 302 are respectively composed of two rectangular coils which are symmetrically distributed, the winding directions of the two rectangular coils are opposite, and other parameters of the two rectangular coils are consistent with the connected excitation signals; meanwhile, the upper coil 301 and the lower coil 302 are distributed orthogonally, and excitation signals of the upper coil 301 and the lower coil 302 are sinusoidal signals with equal amplitude and frequency and 90-degree phase difference.
2. The probe for detecting cracks in any direction of the rotating electromagnetic field pipeline as claimed in claim 1, wherein a rectangular groove is formed on the probe shell, and the rectangular groove and the small groove are connected together for passing through a signal wire; the front end of the probe shell is provided with a semicircular groove, the semicircular groove is used for storing signal lines, a joint hole is formed in the upper portion of the semicircular groove, a circular protrusion is formed in the back of the semicircular groove, and the front end and the rear end of the probe shell are provided with connecting holes.
3. The probe for detecting the cracks in any direction of the rotating electromagnetic field pipeline as claimed in claim 1, further comprising a protective cover, wherein the protective cover is in a semicircular shape as a whole, a groove in the middle of the protective cover is used for passing a signal line, the front end of the protective cover is pressed by the circular protrusion of the probe shell, and a connecting hole is formed in the rear end of the protective cover.
4. The probe for detecting cracks in any direction of a rotating electromagnetic field pipeline as claimed in claim 1, further comprising a probe cover, wherein the probe cover is provided with a connecting hole.
5. The probe for detecting cracks in any direction of a rotating electromagnetic field pipeline as claimed in claim 1, further comprising a connector, wherein the connector is mounted on the connector hole of the probe housing.
6. A rotating electromagnetic field pipeline arbitrary direction crack detection probe as claimed in claim 1, further comprising a connecting means connecting said probe housing and said protective cover together through a connecting hole, said connecting means connecting said probe housing and said probe cover together through a connecting hole.
7. A rotating electromagnetic field pipeline crack detection system in any direction comprises a signal generator, a power amplifier, a phase-locked amplifier, a data acquisition module and an upper computer; the probe is characterized by further comprising a rotating electromagnetic field pipeline crack detection probe in any direction as claimed in any claim 1-6, wherein the signal generator is connected with the power amplifier, the power amplifier is connected with the exciting coil, the phase-locked amplifier is connected with the magnetic field sensor and the signal generator, the signal acquisition module is connected with the phase-locked amplifier, and the upper computer is connected with the signal acquisition module.
8. The system for detecting the cracks in any direction of the rotating electromagnetic field pipeline as claimed in claim 7, wherein the signal generator generates 2 paths of sinusoidal signals with 90 ° phase difference, the sinusoidal signals are loaded into the exciting coil through the power amplifier, the magnetic field sensor picks up the magnetic field signals in the space and converts the magnetic field signals into electric signals, the input signals of the phase-locked amplifier are the electric signals of the magnetic field sensor, the reference signals of the phase-locked amplifier are any one of the 2 paths of sinusoidal signals generated by the signal generator, the output signals of the phase-locked amplifier are collected by the signal collection module and are finally transmitted to the upper computer, and the upper computer processes the signals collected by the signal collection module.
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