CN102162795B - Method for comprehensive on-line detection of defects of band steel - Google Patents
Method for comprehensive on-line detection of defects of band steel Download PDFInfo
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- CN102162795B CN102162795B CN 201010112103 CN201010112103A CN102162795B CN 102162795 B CN102162795 B CN 102162795B CN 201010112103 CN201010112103 CN 201010112103 CN 201010112103 A CN201010112103 A CN 201010112103A CN 102162795 B CN102162795 B CN 102162795B
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Abstract
The invention discloses a method for comprehensive on-line detection of defects of band steel. A production speed signal sensor is used to acquire a production line speed; a signal is modulated by a synchronous box to form a standard pulse; the same pulse signal triggers a laser light source of a linear laser and an image sensor; light emitted by the linear laser irradiates the surface of the band steel; the light irradiates the image sensor after being reflected by the surface of the band steel; the image sensor receives an image signal, and transmits image signal data to a subsequent digital signal processor; when the laser irradiates the surface of the band steel, the surface of the band steel is vibrated to form ultrasonic waves; the ultrasonic waves are transmitted via the band steel and are received by an ultrasonic signal receiving sensor arranged below the band steel; and meanwhile, the image signal data is transmitted to the subsequent digital signal processor. Through combination of two synchronous detection methods, defects on the surface of the band steel or in the band steel can be effectively detected, and the comprehensive online detection on the defects of the band steel is realized.
Description
Technical field
The present invention relates to the metering of a kind of length, thickness or similar linear dimension or the metering of angle; The metering field of the metering of area or irregular surface or profile relates in particular to a kind of to smelting iron and steel product-with the surface of steel and the detection field of inherent vice.
Background technology
At present, each smelting iron and steel manufacturer in its production run because the problem that smelting process exists or the foreign matter that in the operation of rolling, is strayed into so that rolling with steel in its surface and the inner defective that may exist in various degree, as:
The belt steel surface variable thickness or the time narrow when wide;
2. belt steel surface pit or warp;
With crackle, slag inclusion, the rimhole of steel inside, the defective such as scab.
And general detection means is exploitation strip surface quality detection system under the prior art, realizes the detection to strip surface quality, and exploitation is take the ultrasonic or band steel inner clamps foreign material defects detection of current vortex technology as leading.If accomplishing steel defect with existing technology, then needs to install the different equipment of two covers and work simultaneously from table and innerly detect simultaneously, waste time and energy.
Publication number CN1363820, open day on 08 14th, 2002 Chinese patent, the ultrasonic accurate thickness measuring method of a kind of short-pulse laser and device, the thickness measuring method of this patent is to utilize ultrafast short pulse laser beam in testing sample front surface excite sound waves, when sound wave passes to the rear surface, cause that deformation occurs in the sample rear surface, for the first time deflection can occur owing to current deformation from the detection light of sample rear surface reflection in another bundle; Sound pulse arrives behind the rear surface again from the rear surface to front surface reflection, goes back to the rear surface from front surface reflection again, finishes a periods of reflections, at this moment surveys light and will detect the deflection second time of certain delay was arranged on the time; The mistiming of twice deflection be multiply by the velocity of propagation of sound wave in sample, is exactly the thickness of sample divided by two again.The measuring thickness device of realizing thickness measuring method is comprised of light source, beam splitting system, focusing system and receiving system.
The principal character of this patent is to utilize ultrafast short pulse laser beam in testing sample front surface excite sound waves, when sound wave passes to the rear surface, cause that deformation occurs in the sample rear surface, for the first time deflection can occur owing to current deformation from the detection light of sample rear surface reflection in another bundle; Sound pulse arrives behind the rear surface again from the rear surface to front surface reflection, goes back to the rear surface from front surface reflection again, finishes a periods of reflections, at this moment surveys light and will detect the deflection second time of certain delay was arranged on the time; The mistiming of twice deflection be multiply by the velocity of propagation of sound wave in sample, is exactly the thickness of sample divided by two again.
Publication number CN1508535, open day on 06 30th, 2004 Chinese patent, a kind of scanning land steel surface detercting method and device detect the detection that reaches the little defective that produces continuously to single large-area steel strip surface defect.This patent is by panoramic camera and high resolution scanning video camera and usefulness, adopt panoramic camera that the overall situation of belt steel surface is comprised that strip width detects first, then with smear camera movably amplification detection is scanned in the part, both can detect more remarkable defective, can the surface imperfection of less continuous generation be detected again, thereby improved the accuracy rate that steel strip surface defect detects, whole apparatus structure is simple, hardware cost is low, and detection efficiency is high.Cooperate with production control system, can obtain the more stable band steel of surface quality.
This invention relates to a kind of belt steel surface detection method and implements the device of the method, especially single large-area steel strip surface defect is detected the detection that reaches the little defective that produces continuously.
But above-mentioned two patents are used normal optical for one belt steel surface are detected online, use laser-ultrasound for one, measure metal thickness, and there is significantly difference in the scheme that proposes with this case.
In sum, now need a kind of energy to realize the method that from outward appearance to inner essence detects online simultaneously with steel.
Summary of the invention
For the various measuring abilities that solve under the prior art comparatively single, and as need to detect with steel in its surface and the inner defective that may exist in various degree, with existing technology, then needing to install the different equipment of two covers works simultaneously, the problem that wastes time and energy, the invention provides a kind of method of comprehensive online detection steel defect, can detect online simultaneously belt steel surface and inherent vice simultaneously.Concrete grammar of the present invention is as described below:
A kind of method of comprehensive online detection steel defect, by using: linear laser device, imageing sensor, ultrasonic signal receiving sensor, speed of production signal transducer, synchronous box and digital signal processor is characterized in that:
Described speed of production signal transducer is used for knowing line speed, and this signal is modulated by synchronous box, makes rate signal become full sized pules, and this same pulse signal triggers LASER Light Source and the imageing sensor of linear laser device;
The light of described linear laser device emission shines belt steel surface, and light shines in the imageing sensor after reflecting through belt steel surface, and imageing sensor receives picture signal, and image signal data is passed to follow-up digital signal processor;
Described ultrasonic signal receiving sensor, it is specially, when Ear Mucosa Treated by He Ne Laser Irradiation arrives belt steel surface, belt steel surface is produced vibration, form ultrasound wave, ultrasound wave transmits by the band steel, and the ultrasonic signal receiving sensor that is positioned in the steel below receives, and also image signal data is passed to follow-up digital signal processor simultaneously.
Two kinds of above-mentioned detection methods are carried out simultaneously, can realize the from outward appearance to inner essence simultaneously online detection of band steel.
Method according to comprehensive online detection steel defect of the present invention is characterized in that, the light that sends of described linear laser device is high frequency controllable pulse light, by the single shaft light penetrating device, is modulated into interference light, converges on the belt steel surface again.
The light that sends of linear laser device is high frequency controllable pulse light, this kind high frequency controllable pulse light is as hyperacoustic sound source, require to be the thermoelasticity source, preventing from destroying the belt steel surface form, and can suppress to cross by force because of band steel directivity and make imageing sensor can't obtain clearly image.
Method according to comprehensive online detection steel defect of the present invention, it is characterized in that, described imageing sensor, receive the above-mentioned laser signal by the high frequency controllable pulse light that reflects with steel, the belt steel surface brightness change information that obtains is converted into digital signal, and pass to follow-up digital signal processor, steel strip surface defect is processed and analyzed.
Method according to comprehensive online detection steel defect of the present invention, it is characterized in that, the described ultrasonic signal receiving sensor that is arranged at the steel below, this sensor amplifies the ultrasonic signal that receives, the filtering arrangement, form band steel internal ultrasonic image, and will pass to follow-up digital signal processor after its digitizing, band steel inner clamps foreign material are detected.
Because sound wave is in the metal materials such as band steel, the speed of transmission is very fast, considerably beyond strip speed, can realize that therefore the using ultrasound ripple carries out real-time online to band steel inherent vice and detects.
Method according to comprehensive online detection steel defect of the present invention, it is characterized in that described ultrasonic signal receiving sensor also can be arranged on light source the same side of linear laser device, namely with the top of steel, accept surface wave, thereby detect steel strip surface defect.
This kind method to set up is used for cooperating the belt steel surface of linear laser instrument and imageing sensor to detect, and it is more accurate that belt steel surface is detected.
The core concept of the method for comprehensive online detection steel defect of the present invention is as follows: the high frequency controllable pulse light of linear laser device emission, after the modulation of single shaft lens, become interference light, shine belt steel surface, light shines in the imageing sensor after reflecting through belt steel surface, and imageing sensor receives picture signal, image signal data is passed to data handling system, steel strip surface defect is processed and analyzed.And Ear Mucosa Treated by He Ne Laser Irradiation is to belt steel surface, belt steel surface is produced vibration, form ultrasound wave, ultrasound wave transmits by the band steel, and the ultrasonic sensor that is positioned on the strip width direction receives, form band steel internal ultrasonic image, band steel inner clamps foreign material are detected, because sound wave is in the metal materials such as band steel, the speed of transmission is very fast, considerably beyond strip speed, can realize that therefore the using ultrasound ripple carries out real-time online to band steel inherent vice and detects.
Use the method for comprehensive online detection steel defect of the present invention, obtain following beneficial effect:
1. use the method for comprehensive online detection steel defect of the present invention, its laser detection part, overcome conventional laser as the surface detecting system light source, because its directivity is excessively strong, and causes belt steel surface one defectiveness, imageing sensor just can't obtain the shortcoming of blur-free imaging, and the present invention has adopted high frequency controllable pulse light, can suppress to make imageing sensor can't obtain clearly image because being with the steel directivity to cross by force, namely can detect steel strip surface defect
2. use the method for comprehensive online detection steel defect of the present invention, utilize above-mentioned high frequency controllable pulse light to impact the metal surface and can produce ultrasonic phenomenon, band steel inherent vice is carried out scanning analysis.
3. in conjunction with above-mentioned two, the method for comprehensive online detection steel defect of the present invention can effectively detect belt steel surface and inherent vice, realizes comprehensively online detection the to steel defect.
Description of drawings
Fig. 1 is the specific works synoptic diagram of the method for comprehensive online detection steel defect of the present invention;
Fig. 2 is the control system sequential chart of the method for comprehensive online detection steel defect of the present invention.
Among the figure: 1-linear laser device, the 2-imageing sensor, 3-ultrasonic signal receiving sensor, 4-is with steel, 5-speed of production signal transducer, the synchronous box of 6-, 7-digital signal processor.
Embodiment
Be described further below in conjunction with the method for accompanying drawing to comprehensive online detection steel defect of the present invention:
Such as Fig. 1 explanation.In band steel 4 production runes, line speed is known by speed of production signal transducer 5 in system, and this signal modulated by synchronous box 6, make rate signal become full sized pules, and trigger LASER Light Source and the imageing sensor 2 of linear laser device 1 with this same pulse signal, so that light of the LASER Light Source of linear laser device emission, imageing sensor is with regard to run-down, the method can guarantee that the image that imageing sensor obtains becomes fixed proportion with the band steel, the follow-up digital signal processor 7 that the combining image sensor connects, analyze whether defectiveness of belt steel surface, its waveform is illustrated in figure 2 as fixed proportion; And when the LASER Light Source (high frequency controllable pulse light) of linear laser device when shining belt steel surface, belt steel surface is impacted, impact energy is inner and surface propagation at the band steel, form surface wave and compressional wave, accept compressional wave at the ultrasonic signal receiving sensor 3 with the steel backing face, and this signal passed to follow-up digital signal processor, whether there is defective thereby analyze band steel inside.
In conjunction with above-mentioned two kinds of synchronous detection methods, the method for comprehensive online detection steel defect of the present invention can effectively detect belt steel surface and inherent vice, realizes comprehensively online detection the to steel defect, is applicable to be with the steel detection field.
Claims (3)
1. the method for a comprehensive online detection steel defect, by using: linear laser device (1), imageing sensor (2), ultrasonic signal receiving sensor (3), speed of production signal transducer (5), synchronous box (6) and digital signal processor (7) is characterized in that:
Described speed of production signal transducer (5) is used for knowing line speed, and this signal modulated by synchronous box (6), make rate signal become full sized pules, this same pulse signal triggers LASER Light Source and the imageing sensor (2) of linear laser device (1);
The light of described linear laser device (1) emission, shine band steel (4) surface, after light reflects through belt steel surface, shine in the imageing sensor (2), imageing sensor receives by the laser signal with the steel reflection, the belt steel surface brightness change information that obtains is converted into digital signal, and passes to follow-up digital signal processor (7), steel strip surface defect is processed and analyzed;
Described ultrasonic signal receiving sensor (3) places the below of band steel (4), when Ear Mucosa Treated by He Ne Laser Irradiation arrives band steel (4) surface, belt steel surface is produced vibration, form ultrasound wave, ultrasound wave transmits by the band steel, the ultrasonic signal receiving sensor that is positioned in the steel below receives, this sensor amplifies the ultrasonic signal that receives, the filtering arrangement, form band steel internal ultrasonic image, and will pass to follow-up digital signal processor (7) after its digitizing, band steel inner clamps foreign material are detected.
2. the method for comprehensive online detection steel defect as claimed in claim 1, it is characterized in that the light that sends of described linear laser device (1) is high frequency controllable pulse light, by the single shaft light penetrating device, be modulated into interference light, converge to again on the surface of band steel (4).
3. the method for comprehensive online detection steel defect as claimed in claim 1, it is characterized in that described ultrasonic signal receiving sensor (3) also can be arranged on light source the same side of linear laser device (1), namely with the top of steel, accept surface wave, thereby detect steel strip surface defect.
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| CN102980894B (en) * | 2012-11-13 | 2016-07-06 | 上海交通大学 | Steel structure special type weld nondestructive detection system and method |
| CN104113946B (en) * | 2013-04-17 | 2017-02-22 | 宝山钢铁股份有限公司 | light source illuminance adaptive control device and light source illuminance adaptive control method |
| KR101729454B1 (en) * | 2013-07-22 | 2017-04-21 | 제트에스-핸들링 게엠베하 | Device for inspecting workpiece surfaces and strip materials |
| CN104515776A (en) * | 2013-09-26 | 2015-04-15 | 宝钢新日铁汽车板有限公司 | Device and method for determining positions of strip steel surface defect |
| CN108120685A (en) * | 2017-12-14 | 2018-06-05 | 太原理工大学 | Steel cord detection method and device based on photoacoustic imaging |
| CN109459441A (en) * | 2019-01-15 | 2019-03-12 | 南京中禧智能科技有限公司 | A kind of detection device, system and method |
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