CN108279265B - Control method of strip steel online nondestructive testing device - Google Patents
Control method of strip steel online nondestructive testing device Download PDFInfo
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- CN108279265B CN108279265B CN201711477910.9A CN201711477910A CN108279265B CN 108279265 B CN108279265 B CN 108279265B CN 201711477910 A CN201711477910 A CN 201711477910A CN 108279265 B CN108279265 B CN 108279265B
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- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Abstract
The invention discloses a control method of a strip steel on-line nondestructive testing device, which is provided with a conveying mechanism and a controller, wherein the controller controls the conveying mechanism to horizontally convey strip steel, and a first detection probe and a second detection probe are respectively arranged above and below a strip steel conveying path. The first detection probe and the second detection probe are both provided with a magnetic field detection device and a residual magnetism detection device, the magnetic field detection device is used for detecting the uniformity inside the strip steel, the residual magnetism detection device is used for detecting the mechanical characteristics of the surface of the strip steel, and the magnetic field detection device and the residual magnetism detection device are sequentially arranged according to the conveying direction of the strip steel and are respectively connected with the controller. The controller adjusts the position of the first detection probe according to the thickness of the strip steel, then drives the conveying mechanism to convey the strip steel, the first detection probe and the second detection probe detect the uniformity and the mechanical characteristics of the strip steel to obtain magnetic field intensity information, and the uniformity and the mechanical characteristics of the strip steel are determined according to the magnetic field intensity information.
Description
Technical Field
The invention relates to the field of material detection, in particular to a control method of a strip steel online nondestructive testing device.
Background
The mechanical properties of a material are also called mechanical properties, which are the properties that the material shows under the action of force. The mechanical properties of the material have a very important influence on the service and processing properties of the material.
For metal materials with large volume, in the conventional detection technology, a part of the whole produced material is generally intercepted, and then various mechanical detections, such as pressure detection, tension detection and the like, are performed on the intercepted material. Because the shape of the material is damaged, and the whole material cannot be detected and online detection and feedback control in the manufacturing process cannot be implemented, the traditional mechanical detection is gradually replaced by a nondestructive detection technology.
The nondestructive testing technology is to determine the mechanical properties of a material by using the change of signals such as heat, sound, electricity, magnetism and the like generated by the defects of the content structure of the material. Among the nondestructive testing methods, the magnetic stress measurement method is a method for testing the performance of a material by taking the magnetic property change of the material as a judgment basis.
Disclosure of Invention
In order to solve the technical problems, the invention provides an online nondestructive testing device for the mechanical properties of cold-rolled strip steel and a control method thereof.
The technical scheme is as follows:
the utility model provides an online nondestructive test device of belted steel, is provided with transport mechanism and controller, and this controller control transport mechanism horizontal transfer belted steel, its key lies in: the first detection probe and the second detection probe are respectively positioned above and below the strip steel conveying path, the first detection probe and the second detection probe are oppositely arranged, and the distance between the first detection probe and the second detection probe is larger than the thickness of the strip steel;
the first detection probe and the second detection probe are respectively provided with a magnetic field detection device and a residual magnetism detection device, the magnetic field detection device is used for detecting the uniformity inside the strip steel, the residual magnetism detection device is used for detecting the mechanical characteristics of the surface of the strip steel, and the magnetic field detection device and the residual magnetism detection device are sequentially arranged according to the conveying direction of the strip steel and are respectively connected with the controller.
By adopting the structure, the magnetic field detection devices on the first detection probe and the second detection probe are matched, so that the crystallization uniformity inside the strip steel can be detected.
The residual magnetic field strength on the surface of the strip steel can be detected through the residual magnetism detection device on the first detection probe, and the yield strength and the tensile strength of the strip steel can be obtained according to the residual magnetic field strength.
Furthermore, the magnetic field detection device is provided with a U-shaped electromagnet, a coil on the U-shaped electromagnet is connected with pulse excitation current, two ends of the U-shaped electromagnet are over against the strip steel transmission path, and a magnetic field sensor is arranged between two ends of the U-shaped electromagnet;
the two ends of the U-shaped electromagnet of the first detection probe are opposite to the N pole end and the S pole end of the U-shaped electromagnet of the second detection probe in pairs, and the magnetic field sensor of the first detection probe is opposite to the magnetic field sensor of the second detection probe;
the magnetic field sensor is connected with the controller, and the controller excites the current magnitude, the current frequency and the current direction of the current.
The U-shaped electromagnet can enable the strip steel to generate an induction magnetic field, the magnetic field sensor can detect the magnetic field intensity of the induction magnetic field, the crystallization uniformity inside the strip steel can be calculated according to the magnetic field intensity, and the pulse excitation currents of the first detection probe and the second detection probe can be adjusted according to the magnetic field intensity of the induction magnetic field, so that the excitation electromagnetic field generated by the U-shaped electromagnet is uniformly distributed inside the strip steel, and the detection of the magnetic field sensor and the residual magnetism detection device is facilitated.
Furthermore, the magnetic field detection device and the residual magnetism detection device are both arranged in an installation box, one surface of the installation box, which faces the strip steel transmission path, is provided with two magnetic field windows, one magnetic field detection window and a residual magnetism detection window, wherein the two magnetic field windows respectively correspond to two ends of the U-shaped electromagnet, the magnetic field detection windows correspond to the magnetic field sensor, the residual magnetism detection windows correspond to the residual magnetism detection device, and the magnetic field sensor and the residual magnetism detection device are both covered with shielding cases.
By adopting the structure, the shielding box can shield the interference of external signals and can also avoid the interference of the electromagnetic field of the U-shaped electromagnet on other equipment.
Furthermore, the magnetic field detection device is provided with a strip-shaped electromagnet and a magnetic field sensor, a coil of the strip-shaped electromagnet is connected with excitation current, the magnetic field sensor of the first detection probe is arranged opposite to the magnetic field sensor on the second detection probe, and the strip-shaped electromagnet of the first detection probe and the strip-shaped electromagnet of the second detection probe are symmetrically arranged around the central line of the magnetic field sensor and are respectively positioned above and below the strip steel conveying path;
the electromagnetic field directions of the strip electromagnet of the first detection probe and the strip electromagnet of the second detection probe are opposite, the magnetic field sensor is connected with the controller, and the controller controls the current magnitude, the current frequency and the current direction of the exciting current.
By adopting the structure, the strip-shaped electromagnet can enable the strip steel to generate an induction magnetic field, the magnetic field sensor can detect the magnetic field intensity of the induction magnetic field, the crystallization uniformity inside the strip steel can be calculated according to the magnetic field intensity, and the pulse excitation current of the first detection probe and the second detection probe can be adjusted according to the magnetic field intensity of the induction magnetic field, so that the excitation electromagnetic field generated by the U-shaped electromagnet is uniformly distributed inside the strip steel, and the detection of the magnetic field sensor and the residual magnetism detection device is facilitated.
Furthermore, the magnetic field detection device and the residual magnetism detection device are arranged in an installation box, a magnetic field window, a magnetic field detection window and a residual magnetism detection window are arranged on one surface of the installation box, which faces the strip steel transmission path, wherein the magnetic field window corresponds to the strip-shaped electromagnet, the magnetic field detection window corresponds to the magnetic field sensor, the residual magnetism detection window corresponds to the residual magnetism detection device, and the magnetic field sensor and the residual magnetism detection device are both covered with shielding cases.
The shielding box can shield the interference of external signals and can also avoid the interference of the electromagnetic field of the strip-shaped electromagnet on other equipment.
Furthermore, the magnetic field window and the detection window are both covered with a magnetic conductive adhesive layer.
By adopting the structure, in the detection process, the magnetic conductive glue is abutted against the surface of the strip steel, the magnetic resistance between the magnetic field generating device and the strip steel can be reduced by the magnetic conductive glue, and only the magnetic conductive glue needs to be replaced after the magnetic conductive glue layer is worn, so that the service life of the equipment is prolonged.
Furthermore, a displacement mechanism is arranged and drives the first detection probe to move up and down. The fall between the first detection probe and the second detection probe is larger than the thickness of the strip steel, so that the strip steel can pass through.
Furthermore, the residual magnetism detection device is provided with a Hall sensor, the Hall sensor is used for detecting the residual magnetism intensity on the surface of the strip steel, and the Hall sensor of the first detection probe and the Hall sensor of the second detection probe are oppositely arranged and are respectively connected with the controller.
By adopting the structure, the Hall sensor can sense the residual magnetism intensity of the strip steel, and the mechanical property of the surface of the strip steel can be determined through the residual magnetism intensity.
The control method of the online nondestructive testing device for the mechanical properties of the strip steel is characterized by comprising a controller, wherein the controller is connected with an input and output module, and the controller comprises the following steps:
the controller is provided with a controller, the controller is connected with an input and output module, and the controller is provided with the following steps:
s1, acquiring the thickness information a of the strip steel sent by the input and output module;
s2, controlling the driving displacement mechanism to drive the first detection probe to move according to the thickness information a, so that the first detection probe and the strip steel reach a set lifting distance;
s3, adjusting the size and frequency of the pulse excitation current;
s4, driving the conveying mechanism to continuously convey the strip steel along the conveying path;
s5, acquiring a magnetic field strength signal c1 and a magnetic field strength signal c2 sent by the magnetic field sensors on the first detection probe and the second detection probe, and simultaneously acquiring a residual magnetism strength signal d1 and a residual magnetism strength signal d2 sent by the Hall sensors on the first detection probe and the second detection probe;
s6, determining the uniformity information f inside the strip steel according to the magnetic field strength signal c1 and the magnetic field strength signal c2, wherein the uniformity information f comprises the part uniformity information f1 of the strip steel and the whole uniformity information f2 of the strip steel;
in the prior art, the yield strength information i and the tensile strength information j of the strip steel are determined according to the residual magnetism strength signal d1 and the residual magnetism strength signal d2, and the reaction of the residual magnetism to the stress is sensitive and is more suitable for reflecting the stress distribution condition in the strip steel;
and S7, sending the uniformity information f, the yield strength information i and the tensile strength information j to an input-output module for display.
Further, step S3 adjusts the magnitude and frequency of the pulsed excitation current by:
s3-1, controlling a transmission mechanism to transmit the strip steel to the lower part of the first detection probe;
s3-2, controlling the power supply module to output excitation current according to the thickness information a;
s3-3, respectively acquiring a magnetic field strength signal b1 and a magnetic field strength signal b2 sent by the magnetic field sensor of the first detection probe and the magnetic field sensor of the second detection probe;
s3-4, judging whether the magnetic field strength of the magnetic field strength signal b1 and the magnetic field strength signal b2 are equal or not;
if not, changing the current magnitude and the current frequency of the pulse excitation current, and returning to the step S3-3;
if the current values are equal, controlling the power supply module to continuously output the excitation current, and ending the process;
step S6, determining the uniformity information f inside the strip steel by adopting the following method:
s6-1, continuously acquiring a magnetic field strength signal c1 and a magnetic field strength signal c 2;
s6-2, respectively generating a magnetic field intensity curve e1 and a magnetic field intensity curve e2 according to the magnetic field intensity signal c1 and the magnetic field intensity signal c2 by taking time as an abscissa and taking the magnetic field intensity as an ordinate;
s6-3, comparing the magnetic field intensity corresponding to the magnetic field intensity curve e1 and the magnetic field intensity curve e2 at the same time point, and determining the crystallization uniformity information f1 of the part of the strip steel corresponding to the time point;
if the magnetic field intensity is equal, the crystallization uniformity of the part is better, otherwise, the crystallization uniformity is poorer;
s6-4, determining integral crystallization uniformity information f2 of the strip steel according to the smoothness degree of the magnetic field intensity curve e1 and the smoothness degree of the magnetic field intensity curve e 2;
if the curve smoothness is good, the integral crystallization uniformity of the strip steel is good, otherwise, the crystallization uniformity is poor.
Has the advantages that: the band steel on-line nondestructive testing device and the control method thereof can concentrate the intensive region of the excitation magnetic field at the detection center position of the band steel, are convenient for nondestructive testing of the mechanical property of the band steel, and have strong anti-interference capability and long service life of equipment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the position structure of the detection window and the magnetic field window according to the first embodiment;
FIG. 3 is a schematic view of an internal mounting structure of the magnetic field detecting device according to the first embodiment;
FIG. 4 is a schematic diagram showing the position structure of the detection window and the magnetic field window of the first detection probe according to the second embodiment;
FIG. 5 is a schematic diagram showing the position structure of the detection window and the magnetic field window of the first detection probe according to the second embodiment;
FIG. 6 is a schematic diagram showing the position structure of the detection window and the magnetic field window of the second detection probe according to the second embodiment;
FIG. 7 is a schematic diagram showing the position structure of the detection window and the magnetic field window of the second detection probe according to the second embodiment;
fig. 8 is a schematic view of an internal mounting structure of the magnetic field detection device of the first and second detection probes according to the second embodiment;
FIG. 9 is a flowchart of a control method of the detecting device;
FIG. 10 is a flow chart for regulating pulsed excitation current;
fig. 11 is a flow chart for generating uniformity information.
Detailed Description
The invention is further illustrated by the following examples and figures.
In a first embodiment, as shown in fig. 1 to 8, an online nondestructive testing apparatus for strip steel is provided with a conveying mechanism and a controller, the controller controls the conveying mechanism to horizontally convey the strip steel, a first detection probe 1 and a second detection probe 2 are arranged on a conveying path of the strip steel, the first detection probe 1 and the second detection probe 2 are respectively located above and below the conveying path of the strip steel, the first detection probe 1 and the second detection probe 2 are oppositely arranged, and a distance between the first detection probe 1 and the second detection probe 2 is greater than a thickness of the strip steel. The first detection probe 1 is connected with a displacement mechanism 13, and the displacement mechanism 13 drives the first detection probe 1 to move up and down.
The first detection probe 1 and the second detection probe 2 are both provided with a magnetic field detection device 3 and a residual magnetism detection device 4, and the magnetic field detection device 3 and the residual magnetism detection device 4 are both arranged in an installation box 7. And are arranged in sequence according to the conveying direction of the strip steel.
The magnetic field detection device 3 is provided with a U-shaped electromagnet 5, a coil on the U-shaped electromagnet 5 is connected with pulse excitation current, and two ends of the U-shaped electromagnet 5 are opposite to the strip steel transmission path. The N-pole end of the U-shaped electromagnet 5 of the first detection probe 1 is opposite to the N-pole end of the U-shaped electromagnet 5 of the second detection probe 2, and the S-pole end of the U-shaped electromagnet 5 of the first detection probe 1 is opposite to the S-pole end of the S-shaped electromagnet 5N of the second detection probe 2.
Two magnetic field windows 8 are arranged on the installation box 7 opposite to the two ends of the U-shaped electromagnet 5. A magnetic field detection window 9 is arranged between the two magnetic field windows 8, and a magnetic field sensor 6 is arranged at the magnetic field detection window 9. The magnetic field window 8 and the magnetic field detection window 9 are both covered with a magnetic conductive adhesive layer 12.
The residual magnetism detection device 4 is a Hall sensor, the magnetic field sensor 6 and the residual magnetism detection device 4 of the first detection probe 1 are respectively arranged opposite to the magnetic field sensor 6 and the residual magnetism detection device 4 of the second detection probe 2, and are respectively covered with a shielding cover c
The magnetic field sensor 6 and the Hall sensor are respectively connected with the controller, and the controller controls the size and the frequency of the pulse excitation current.
As shown in fig. 9-11, a control method of a strip steel online nondestructive testing device is provided with a controller, the controller is connected with an input/output module, and the controller is provided with the following steps:
s1, acquiring the thickness information a of the strip steel sent by the input and output module;
s2, controlling the driving displacement mechanism 13 to drive the first detection probe 1 to move according to the thickness information a, so that the first detection probe 1 and the strip steel reach a set lifting distance;
s3, adjusting the size and frequency of the pulse excitation current, and the specific steps are as follows:
s3-1, controlling a transmission mechanism to transmit the strip steel to the lower part of the first detection probe 1;
s3-2, controlling the power supply module to output excitation current according to the thickness information a;
s3-3, respectively acquiring a magnetic field strength signal b1 and a magnetic field strength signal b2 sent by the magnetic field sensor 6 of the first detection probe 1 and the magnetic field sensor 6 of the second detection probe 2;
s3-4, judging whether the magnetic field strength of the magnetic field strength signal b1 and the magnetic field strength signal b2 are equal or not;
if not, changing the current magnitude and the current frequency of the pulse excitation current, and returning to the step S3-3;
if the current values are equal, controlling the power supply module to continuously output the excitation current;
s4, driving the conveying mechanism to continuously convey the strip steel along the conveying path;
s5, acquiring a magnetic field intensity signal c1 and a magnetic field intensity signal c2 sent by the magnetic field sensors 6 on the first detection probe 1 and the second detection probe 2, and simultaneously acquiring a residual magnetic intensity signal d1 and a residual magnetic intensity signal d2 sent by the Hall sensors 14 on the first detection probe 1 and the second detection probe 2;
s6, determining the uniformity information f inside the strip steel according to the magnetic field intensity signal c1 and the magnetic field intensity signal c2, wherein the uniformity information f comprises the part uniformity information f1 of the strip steel and the whole uniformity information f2 of the strip steel. The method comprises the following specific steps:
s6-1, continuously acquiring a magnetic field strength signal c1 and a magnetic field strength signal c 2;
s6-2, respectively generating a magnetic field intensity curve e1 and a magnetic field intensity curve e2 according to the magnetic field intensity signal c1 and the magnetic field intensity signal c2 by taking time as an abscissa and taking the magnetic field intensity as an ordinate;
s6-3, comparing the magnetic field intensity of the magnetic field intensity curve e1 and the magnetic field intensity curve e2 at the same time point to determine the crystallization uniformity information f1 of the part of the strip steel corresponding to the time point;
if the magnetic field intensity is equal, the crystallization uniformity of the part is better, otherwise, the crystallization uniformity is poorer;
s6-4, determining integral crystallization uniformity information f2 of the strip steel according to the smoothness degree of the magnetic field intensity curve e1 and the smoothness degree of the magnetic field intensity curve e 2;
if the curve smoothness is good, the integral crystallization uniformity of the strip steel is good, otherwise, the crystallization uniformity is poor.
Determining the yield strength information i and the tensile strength information j of the strip steel according to the residual magnetic strength signal d1 and the residual magnetic strength signal d 2;
and S7, sending the uniformity information f, the yield strength information i and the tensile strength information j to an input-output module for display.
The second embodiment is substantially the same as the first embodiment, and the main differences are as follows: the magnetic field detection device 3 is provided with a strip-shaped electromagnet 11 and a magnetic field sensor 6, a coil of the strip-shaped electromagnet 11 is connected with excitation current, the magnetic field sensor 6 of the first detection probe is arranged opposite to the magnetic field sensor 6 of the second detection probe, and the strip-shaped electromagnet 11 of the first detection probe and the strip-shaped electromagnet 11 of the second detection probe are symmetrically arranged around the central line of the magnetic field sensor 6 and are respectively positioned above and below the strip steel conveying path;
the electromagnetic field directions of the strip-shaped electromagnet 11 of the first detection probe and the strip-shaped electromagnet 11 of the second detection probe are opposite, the magnetic field sensor 6 is connected with a controller, and the controller controls the current magnitude, the current frequency and the current direction of the exciting current.
The magnetic field detection device 3 and the residual magnetism detection device 4 are both arranged in an installation box 7, a magnetic field window 8, a magnetic field detection window 9 and a residual magnetism detection window 10 are arranged on one surface, facing the strip steel transmission path, of the installation box 7, wherein the magnetic field window 8 corresponds to a strip-shaped electromagnet 11, the magnetic field detection window 9 corresponds to a magnetic field sensor 6, the residual magnetism detection window 10 corresponds to the residual magnetism detection device 4, and the magnetic field sensor 6 and the residual magnetism detection device 4 are both covered with shielding cases c.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (9)
1. A control method of a strip steel online nondestructive testing device is set up, and the strip steel online nondestructive testing device is characterized in that the strip steel online nondestructive testing device is provided with a conveying mechanism and a controller, the controller controls the conveying mechanism to horizontally convey strip steel, and is also provided with a first detection probe (1) and a second detection probe (2), the first detection probe (1) and the second detection probe (2) are respectively positioned above and below a strip steel conveying path, the first detection probe (1) and the second detection probe (2) are oppositely arranged, and the distance between the first detection probe and the second detection probe is larger than the thickness of the strip steel;
the first detection probe (1) and the second detection probe (2) are both provided with a magnetic field detection device (3) and a residual magnetism detection device (4), the magnetic field detection device (3) is used for detecting the induction magnetic field intensity of the strip steel, the residual magnetism detection device (4) is used for detecting the residual magnetism intensity of the strip steel, and the magnetic field detection device (3) and the residual magnetism detection device (4) are sequentially arranged according to the conveying direction of the strip steel and are respectively connected with the controller;
the controller is connected with an input and output module, and is provided with the following steps:
s1, acquiring the thickness information a of the strip steel sent by the input and output module;
s2, controlling the driving displacement mechanism (13) to drive the first detection probe (1) to move according to the thickness information a, so that the first detection probe (1) and the strip steel reach a set lifting distance;
s3, adjusting the size and frequency of the pulse excitation current;
s4, driving the conveying mechanism to continuously convey the strip steel along the conveying path;
s5, acquiring a magnetic field intensity signal c1 and a magnetic field intensity signal c2 sent by magnetic field sensors (6) on the first detection probe (1) and the second detection probe (2), and simultaneously acquiring a residual magnetic intensity signal d1 and a residual magnetic intensity signal d2 sent by Hall sensors (14) on the first detection probe (1) and the second detection probe (2);
s6, determining the uniformity information f inside the strip steel according to the magnetic field strength signal c1 and the magnetic field strength signal c2, wherein the uniformity information f comprises the part uniformity information f1 of the strip steel and the whole uniformity information f2 of the strip steel;
determining the yield strength information i and the tensile strength information j of the strip steel according to the residual magnetic strength signal d1 and the residual magnetic strength signal d 2;
and S7, sending the uniformity information f, the yield strength information i and the tensile strength information j to an input-output module for display.
2. The control method of the strip steel on-line nondestructive testing device according to claim 1, characterized in that: the magnetic field detection device (3) is provided with a U-shaped electromagnet (5), a coil on the U-shaped electromagnet (5) is connected with pulse excitation current, two ends of the U-shaped electromagnet (5) are opposite to the strip steel conveying path, and a magnetic field sensor (6) is arranged between two ends of the U-shaped electromagnet (5);
the two ends of the U-shaped electromagnet (5) of the first detection probe (1) are opposite to the N pole end and the S pole end of the U-shaped electromagnet (5) of the second detection probe (2), and the magnetic field sensor (6) of the first detection probe (1) is opposite to the magnetic field sensor (6) of the second detection probe (2);
the magnetic field sensor (6) is connected with the controller, and the controller excites the current magnitude, the current frequency and the current direction of the current.
3. The control method of the strip steel on-line nondestructive testing device according to claim 2, characterized in that: the magnetic field detection device (3) and the residual magnetism detection device (4) are arranged in an installation box (7), two magnetic field windows (8), one magnetic field detection window (9) and a residual magnetism detection window (10) are arranged on one surface, facing the strip steel transmission path, of the installation box (7), the two magnetic field windows (8) correspond to two ends of the U-shaped electromagnet (5) respectively, the magnetic field detection window (9) corresponds to the magnetic field sensor (6), the residual magnetism detection window (10) corresponds to the residual magnetism detection device (4), and the magnetic field sensor (6) and the residual magnetism detection device (4) are covered with shielding covers (c).
4. The control method of the strip steel on-line nondestructive testing device according to claim 1, characterized in that: the magnetic field detection device (3) is provided with a strip-shaped electromagnet (11) and a magnetic field sensor (6), a coil of the strip-shaped electromagnet (11) is connected with excitation current, the magnetic field sensor (6) of the first detection probe is arranged opposite to the magnetic field sensor (6) on the second detection probe, and the strip-shaped electromagnet (11) of the first detection probe and the strip-shaped electromagnet (11) of the second detection probe are symmetrically arranged relative to the central line of the magnetic field sensor (6) and are respectively positioned above and below the strip steel conveying path;
the electromagnetic field directions of the strip-shaped electromagnet (11) of the first detection probe and the strip-shaped electromagnet (11) of the second detection probe are opposite, the magnetic field sensor (6) is connected with a controller, and the controller controls the current magnitude, the current frequency and the current direction of the exciting current.
5. The control method of the strip steel on-line nondestructive testing device according to claim 4, characterized in that: the magnetic field detection device (3) and the residual magnetism detection device (4) are arranged in an installation box (7), a magnetic field window (8), a magnetic field detection window (9) and a residual magnetism detection window (10) are formed in one surface, facing the strip steel conveying path, of the installation box (7), the magnetic field window (8) corresponds to the strip-shaped electromagnet (11), the magnetic field detection window (9) corresponds to the magnetic field sensor (6), the residual magnetism detection window (10) corresponds to the residual magnetism detection device (4), and the magnetic field sensor (6) and the residual magnetism detection device (4) are both covered with shielding covers (c).
6. The control method of the strip steel on-line nondestructive testing device according to claim 3 or 5, characterized in that: the magnetic field window (8) and the magnetic field detection window (9) are both covered with a magnetic conductive adhesive layer (12).
7. The control method of the strip steel on-line nondestructive testing device according to claim 1, characterized in that: and a displacement mechanism (13) is further arranged, and the displacement mechanism (13) drives the first detection probe (1) to move up and down.
8. The control method of the strip steel on-line nondestructive testing device according to claim 1, characterized in that: the residual magnetism detection device (4) is a Hall sensor, the Hall sensor is used for detecting the residual magnetism intensity on the surface of the strip steel, and the Hall sensor (14) of the first detection probe (1) and the Hall sensor (14) of the second detection probe (2) are arranged oppositely and are respectively connected with the controller.
9. The control method of the strip steel on-line nondestructive testing device according to claim 1, characterized in that:
step S3, the magnitude and frequency of the pulse excitation current are adjusted by the following steps:
s3-1, controlling a transmission mechanism to transmit the strip steel to the lower part of the first detection probe (1);
s3-2, controlling the power supply module to output excitation current according to the thickness information a;
s3-3, respectively acquiring a magnetic field intensity signal b1 and a magnetic field intensity signal b2 sent by the magnetic field sensor (6) of the first detection probe (1) and the magnetic field sensor (6) of the second detection probe (2);
s3-4, judging whether the magnetic field strength of the magnetic field strength signal b1 and the magnetic field strength signal b2 are equal or not;
if not, changing the current magnitude and the current frequency of the pulse excitation current, and returning to the step S3-3;
if the current values are equal, continuously outputting the excitation current with the same magnitude and frequency, and ending the process;
step S6, determining the uniformity information f inside the strip steel by adopting the following method:
s6-1, continuously acquiring a magnetic field strength signal c1 and a magnetic field strength signal c 2;
s6-2, respectively generating a magnetic field intensity curve e1 and a magnetic field intensity curve e2 according to the magnetic field intensity signal c1 and the magnetic field intensity signal c2 by taking time as an abscissa and taking the magnetic field intensity as an ordinate;
s6-3, determining the crystallization uniformity information f1 of the part by comparing the magnetic field intensity of the magnetic field intensity curve e1 and the magnetic field intensity curve e2 at the same time point;
if the magnetic field intensity is equal, the crystallization uniformity of the part is better, otherwise, the crystallization uniformity is poorer;
s6-4, determining integral crystallization uniformity information f2 of the strip steel according to the smoothness degree of the magnetic field intensity curve e1 and the smoothness degree of the magnetic field intensity curve e 2;
if the curve smoothness is good, the integral crystallization uniformity of the strip steel is good, otherwise, the crystallization uniformity is poor.
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| CN114200102B (en) * | 2020-08-28 | 2023-11-14 | 宝山钢铁股份有限公司 | Measuring device and method for determining physical parameters related to electromagnetic properties of strip steel |
| CN114113294B (en) * | 2020-08-28 | 2023-12-12 | 宝山钢铁股份有限公司 | Online measuring device and method for determining yield strength and tensile strength of strip steel |
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