CN101664794A - Continuous casting two cold closed chamber casting blank surface temperature field measuring device - Google Patents
Continuous casting two cold closed chamber casting blank surface temperature field measuring device Download PDFInfo
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- CN101664794A CN101664794A CN200910190876A CN200910190876A CN101664794A CN 101664794 A CN101664794 A CN 101664794A CN 200910190876 A CN200910190876 A CN 200910190876A CN 200910190876 A CN200910190876 A CN 200910190876A CN 101664794 A CN101664794 A CN 101664794A
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Abstract
The invention relates a continuous casting two cold closed chamber casting blank surface temperature field measuring device. The front end of a heat insulating protective sleeve is provided with heatresisting quartz glass, and a cleaning mechanism is arranged in front of one side of the quartz glass. An infrared array CCD camera is arranged in the heat insulating protective sleeve, and a coolingsleeve is sheathed outside the heat insulating protective sleeve. An inlet gas splitter and an outlet air separator are arranged on the cooling sleeve; and the front end of the outlet air separator isprovided with a guide mechanism which leads the air to horizontally blow the casting blank surface in a line shape. The device can overcome the influence of dispersed water mist medium when an optical path is measured, and lead the infrared array CCD camera to work within a controlled temperature range by a temperature sensor; the camera has strong heat resisting capabilty, and the arranged cleaning mechanism can guarantee the cleaness of the quartz class, thus being capable of realizing the measurement of the casting blank surface temperature field with long term, stability, continuity and accuracy, in the two cold closed chambers.
Description
Technical field
The present invention relates to a kind of temperature measuring equipment, specifically refer in continuous casting two cold closed chamber, realize casting blank surface temperature head's phase measurement mechanism accurately.This temperature measuring equipment is mainly used in heating steel billet temperature measurement on-line, operation of rolling rolled piece surface temperature field on-line measurement equicontinuity production system in the field on-line measurement of continuous casting secondary cooling process casting blank surface temperature, the heating furnace, online for a long time under the complex environments such as dust, aqueous vapor, iron scale and high-intensity magnetic field interference to being implemented in, continuously, temperature field measurement accurately, it is significant to improve controlling of production process level and product quality.
Background technology
The measurement of continuous casting billet skin temperature field and control, have great importance to improving cc billet surface quality, be embodied in following several aspect: 1, monitor the strand straightening temperature in real time and whether avoid brittle temperature range, prevent that strand from brittle deformation occurring in the aligning section; The rise speed of 2, on-line monitoring surface temperature reduces the strand underbead crack; 3, on-line monitoring strand cooling velocity reduces surface crack defect; 4, on-line monitoring band liquid core casting blank surface temperature instantaneous value prevents that bulge from producing; 5, the uniformity of on-line monitoring continuous casting billet lateral surfaces temperature for each nozzle control loop of continuous casting secondary cooling water provides the feedback temperature field signal, realizes the control of continuous casting secondary cooling water dynamical feedback.
In the continuous casting two cold closed chamber, continuous casting billet is the object of high temperature motion, and be in the environment of high water smoke, high-heating radiation and high-intensity magnetic field, casting billet surface is covered with the iron scale and the moisture film of irregularity simultaneously, it is not a constant that the iron scale of casting billet surface irregularity and moisture film cause the emissivity of measured surface each point, and irregular nonlinear change takes place.The existence of the high water smoke dispersive medium in detector and the casting billet surface light path makes the casting billet surface radiated electromagnetic wave be subjected to dispersions such as reflection, refraction, absorption, causes bigger thermometric error.Strong magnetic field circumstance causes detector output signal generation serious disturbance, also influences certainty of measurement.These factors cause adopting conventional contacting temperature measurement method (as adopting measuring methods such as thermocouple, thermal resistance) and non-contact thermometry (as conventional infrared radiation thermometer, thermal imaging system etc.), all can't realize the on-line measurement of the continuous casting billet skin temperature (comprising single-point temperature and temperature field) of two cold closed chamber.And current high-quality, the production of automation continuous casting billet require more accurately, real-time (online) temperature data, to reflect current slab quality and to do the corresponding operation of adjusting, realize the dynamic control of two cold-zone water distributions.At present, the thermometry of moving target is mostly adopted contactless temperature-measuring based on photoelectric effect and heat radiation relative theory, mainly comprise western light IRT-1200D type, HCW-III type, HCW-V type as the single-point temperature measuring set; The YHCW-9400 type; WHD4015 type (two aimings, target D40mm can reach 15m), WFHX330 type (optical laying, target D50mm can reach 30m); PM-20 produced in USA, 30,40,50, HAS-201 temperature measurer; The TPT20 of Sweden AGA Aktiebolag, infrared radiation thermometers such as 30,40,50.Thermal infrared imager mainly comprises Japanese TVS-2000, TVS-100; U.S. PM-250, Sweden AGA-THV510,550,570 etc., but these contactless temperature-measuring instrument and thermal infrared imager can't long-time running in this thermometric environment and are guaranteed the precision measured, can't directly apply to the on-line measurement of continuous casting billet skin temperature field in the two cold closed chamber.
For avoiding the influence to radiated electromagnetic wave such as water fog medium and casting billet surface moisture film, common way is to adopt high velocity air to purge the method for light path to weaken the dispersion of water fog medium to radiated electromagnetic wave, and consider the requirement of light path, air-flow is vertically to spray to casting billet surface, sweep gas generally adopts room temperature compressed air or industrial nitrogen, by pyrometry casting billet surface generation convective heat exchange, make the temperature generation reduction by a relatively large margin of strand test point, increase thermometric error greatly.For the influence of dispersive medium to thermometric, have according to reflection, refraction and the absorbing probability incident of light path at dispersive medium, adopt Monte Carlo method (Monte Carlo Method, MCM) equation of radiative transfer is found the solution the also temperature field of reconstruct detected space, this reconstructing method is owing to be difficult to accurately obtain the particle concentration field of optical path space dispersive medium, and it is long to calculate convergence time, thereby the temperature degree of accuracy that obtains is low and can't realize real-time measurement.In order to reduce the influence of dispersive medium to temperature measurement accuracy, also there is employing to measure than color model, this method adopts the electromagnetic wave of two kinds of wavelength to carry out colorimetric measurement, and dispersive mediums such as the water smoke in the light path all have absorption to two kinds of electromagnetic waves, though absorptivity is different, but the influence to monochromatic radioactive intensity ratio is less relatively, with the monocolor method ratio, colorimetric method can improve certainty of measurement, but is subjected to the influence of dispersive medium, and be difficult to demarcate than the coefficient in the color model, also can't guarantee the precision of measuring.The employing three-color process that has carries out temperature survey, this method need not known the emissivity of the tested surface of solids, the absorption of the electromagnetic wave energy of infrared wavelength is improved the degree of accuracy of thermometric by the absworption peak of avoiding selective gas, because the stability of this instrument is subject to the spectrum stability of optical filter, detector and the limitation that wavelength (wavelength period) is selected, the while complex structure, cost an arm and a leg, also be not widely used industrial at present.
At present the on-the-spot casting blank surface temperature of continuous casting is measured to lay particular emphasis on substantially and adopt hand-held infrared radiation thermometer off-line measurement casting blank surface temperature, the thermal infrared imager of employing off-line measurement casting blank surface temperature field is also arranged, belong to off-line portable type measuring mode, and this method can't realize the on-line measurement in interior casting blank surface temperature of continuous casting two cold closed chamber and temperature field.Under the adverse circumstances to high temperature, high water smoke, high-intensity magnetic field in the two cold closed chamber, how to guarantee the work that measuring instrument is online, continuous for a long time, and to stablizing under the situation that temperature measurement error do not produce too much influence, the research work that obtains the casting blank surface temperature field does not relate to substantially.At present, in the continuous casting production scene, also there is not a cover can steady in a long-term, accurately measure the on-line measurement system of casting blank surface temperature field in the two cold closed chamber, and guarantee the secondary cooling water dynamic control technology that the high-quality strand is produced, need badly and solve the reliable and stable on-line measurement of continuous casting billet skin temperature field energy in the two cold closed chamber.
In sum, on-line measurement two cold closed chamber casting blank surface temperature field is a difficult problem on engineering.Should solve high concentration water smoke medium between testee and the thermometric detector to the influence of radiation temperature measurement, prevent from again badly to make the contaminated thermometric error that causes of temperature probe because of the thermometric environment, simultaneously, under the strong magnetic field circumstance condition, guarantee the reliable transmission of signal, realizing stable, accurate, the continuous measurement of continuous casting two cold closed chamber casting blank surface temperature head's time, is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
At prior art above shortcomings and technical problem demanding prompt solution, the purpose of this invention is to provide a kind of casting blank surface temperature field temperature measuring equipment, to realize long-term, the accurately on-line measurement of continuous casting two cold closed chamber casting blank surface temperature field.
The object of the present invention is achieved like this: continuous casting two cold closed chamber casting blank surface temperature field measuring device; it comprises infrared linear array CCD camera, cooling collar and thermal insulation protection sleeve pipe; be provided with resistant to elevated temperatures quartz glass at thermal insulation protection sleeve pipe front end, infrared linear array CCD camera is located in the thermal insulation protection sleeve pipe.Cooling collar is placed in outside the thermal insulation protection sleeve pipe, forms gas channel between cooling collar and the thermal insulation protection sleeve pipe.Be respectively equipped with inlet gas current divider and exit flow separator in cooling collar rear end and front end, the inlet gas current divider is provided with cooling gas inlet, refrigerating gas outlet and holding wire outlet, the outlet of cooling gas inlet and holding wire is same mouthful, the refrigerating gas outlet corresponding gas channel.The exit flow separator is provided with refrigerating gas outlet, is provided with at exit flow separator front end to make air-flow be wire laterally to purge guiding mechanism to casting billet surface.
Described infrared linear array CCD camera comprises ccd detector, and ccd detector is that response spectrum is silicon two utmost point Infrared Detectors linear array arrays of 0.95-1.1 μ m; Perhaps described infrared linear array CCD camera comprises ccd detector and optical filter, and optical filter arrowband centre wavelength is 1.0 μ m.
Further; be provided with wiper mechanism in quartz glass side the place ahead; wiper mechanism comprises aqueduct and is positioned at the aqueduct tail end and facing to the water spout of quartz glass; on aqueduct, be provided with magnetic valve; be provided with in the thermal insulation protection sleeve pipe by detecting the light intensity signal that sees through quartz glass and judge the light intensity sensor of quartz glass pollution level, light intensity sensor is connected with magnetic valve.Dirty when to a certain degree influencing infrared linear array CCD camera and obtain picture effect when quartz glass, just quartz glass is cleaned.
Be provided with temperature sensor in the thermal insulation protection sleeve pipe, temperature sensor is connected with the refrigerating gas control valve with adjusting refrigerating gas flow, thereby infrared linear array CCD camera is worked in the temperature range of control.Described temperature sensor is a thermistor.
In order to reach better effect of heat insulation, described thermal insulation protection sleeve pipe constitutes by concentric, contour three layers, and infrared linear array CCD camera, temperature sensor and light intensity sensor are positioned at innermost layer thermal insulation protection sleeve pipe.
Compared to existing technology, great advantage of the present invention is and can realizes the long-term, stable, continuously, measure accurately of casting blank surface temperature field at two cold closed chamber, be embodied in following some:
1. adopt linear array infrared CCD detector, the response wave spectrum is chosen in the very strong 0.95-1.1 μ m near-infrared wavelength section of water fog medium, adopt transmission type optical system, lens adopt the material that can see through corresponding wave band radiation, the wave band of measurement more than 700 ℃ can effectively overcome detector and tested casting billet surface and measure the influence that light path dispersed water mist medium brings mainly in the near infrared region of 1.0 mu m ranges; Adopt the linear array infrared CCD simultaneously, can realize that the casting blank surface temperature field heat picture of different sequential on a certain lateral attitude of continuous casting two cold closed chamber and temperature value distribute, and express directly perceived, vivid.
2. linear array infrared CCD detector adopts four layers of protection structure, and cooling cover and outermost layer thermal insulation protection sleeve pipe adopt compressed air or industrial nitrogen to carry out air cooling, and outermost layer and intermediate layer, intermediate layer and innermost layer thermal insulation protection sleeve pipe are the air gap; Be provided with thermistor simultaneously, inner operating ambient temperature is monitored in real time, detection signal adopts ICP/IP protocol to transmit by the 1000M Ethernet, guarantees that the high temperature resistant environment ability of detector is strong, satisfies continuous casting two cold closed chamber hot environment Testing requirement fully.Simultaneously, the detector image-forming camera lens is in the environment of a high-seal, to form the space of a high-cleanness, high.
3. be provided with and make air-flow be wire laterally to purge guiding mechanism to casting billet surface, guiding mechanism is decided according to strand cross measure scope, can reduce the temperature measurement error that water fog medium and casting billet surface moisture film take to measuring compressed air of optical path space formation or industrial nitrogen dispersive medium; Simultaneously, be provided with dirty window and detect automatically and wiper mechanism, to guarantee the cleanliness factor of quartz glass.
4. adopt the 1000M Ethernet interface, realize the Long-distance Control of CCD aperture time, prevent the excessive saturated and phenomenon that occurs that electric charge " overflows " and the image that causes " turns white " of electric charge in the potential well that causes of ccd detector heat radiation by the aperture time interface module.
Description of drawings
Fig. 1-structural representation of the present invention.
The specific embodiment
Referring to Fig. 1; from the figure as can be seen; continuous casting two cold closed chamber casting blank surface temperature field measuring device of the present invention mainly comprises wiper mechanism 1, quartz glass 2, infrared linear array CCD camera 3, inlet gas current divider 5, cooling collar 6, thermal insulation protection sleeve pipe 7, refrigerating gas outlet 8, exit flow separator 9, guiding mechanism 10.
Infrared linear array CCD camera 3 is located in the thermal insulation protection sleeve pipe 7; quartz glass 2 is located at thermal insulation protection sleeve pipe 7 front ends; the effect of quartz glass is to prevent that pollution medium from entering in the thermal insulation protection sleeve pipe and ccd video camera is brought infringement, because the strand temperature is very high, so quartz glass should be high temperature resistant.Cooling collar 6 is placed in outside the thermal insulation protection sleeve pipe 7, forms gas channel 4 between cooling collar 6 and the thermal insulation protection sleeve pipe 7.Be respectively equipped with inlet gas current divider 5 and exit flow separator 9 in cooling collar 6 rear ends and front end, inlet gas current divider 5 is provided with cooling gas inlet 11, refrigerating gas outlet 12 and holding wire outlet 13, cooling gas inlet 11 and holding wire outlet 13 are same mouthful, and refrigerating gas exports 12 correspondences and gas channel 4.Exit flow separator 9 is provided with refrigerating gas outlet 8, is provided with at exit flow separator 9 front ends to make air-flow be wire laterally to purge guiding mechanism 10 to casting billet surface.
Infrared linear array CCD camera 3 comprises infrared CCD detector, imaging optical path device, infrared CCD explorer response spectrum is silicon two utmost point infrared detector arrays of 0.95-1.1 μ m, lens and arrowband centre wavelength that optical focusing system adopts germanium material to make are the optical filter of 1.0 μ m, ccd detector has the 1000M Ethernet interface, possess the aperture time controllable function simultaneously, can be according to imaging effect by long-range setting CCD aperture time.
Further; be provided with wiper mechanism 1 in quartz glass 2 side the place aheads; wiper mechanism comprises aqueduct and is positioned at the aqueduct tail end and facing to the water spout of quartz glass; on aqueduct, be provided with magnetic valve; be provided with in the thermal insulation protection sleeve pipe by detecting the light intensity signal that sees through quartz glass and judge the light intensity sensor of quartz glass pollution level, light intensity sensor is connected with magnetic valve.Dirty when to a certain degree influencing infrared linear array CCD camera and obtain picture effect when quartz glass, just quartz glass is cleaned.Specifically, when light intensity sensor detects light intensity signal, judge the dirty degree of window (quartz glass), send control signal, the unlatching of control magnetic valve and closing, the opening time is set as required by the magnetic valve inner parameter, and high quartz glass 2 is cleaned.
Be provided with temperature sensor in the thermal insulation protection sleeve pipe, temperature sensor is connected with the refrigerating gas control valve with adjusting refrigerating gas flow, thereby infrared linear array CCD camera is worked in the temperature range of control.Described temperature sensor is a thermistor.
In order to reach better effect of heat insulation, described thermal insulation protection sleeve pipe constitutes by concentric, contour three layers, and infrared linear array CCD camera, temperature sensor and light intensity sensor are positioned at innermost layer thermal insulation protection sleeve pipe.
When beginning to measure, (pressure is 0.3-0.5MPa with compressed air or industrial nitrogen, air mass flow is 300～500L/h) through auxiliary equipment (oil water separator, drier and filter) handle after, by the heat-resistant fireproof metal hose, enter inlet gas current divider 5 by cooling gas inlet 11, in inlet gas current divider 5, gas is carried out sending into gas channel 4 by refrigerating gas outlet 12 after the constant voltage, infrared linear array CCD camera 3 place environment are carried out gas cooled, refrigerating gas enters exit flow separator 9 after by gas channel 4 again, after in exit flow separator 9, carrying out constant voltage, send into guiding mechanism 10, form diffused wire gas jet stream, imaging optical path and casting billet surface moisture film are purged.
High temperature casting billet surface radiated electromagnetic wave, by blowing medium and part water fog medium, pass quartz glass, by the imaging and focusing camera lens, reach the line array CCD detector, the wave spectrum of ccd detector response 0.95-1.1 μ m, and according to the imaging parameters of setting, form strand temperature heat picture, send by the 1000M Ethernet interface.Situation according to the temperature heat picture, aperture time by Ethernet interface control ccd detector, to obtain satisfied heat picture, by obtaining heat picture, carry out graphical analysis and calculating, and adopt the maximization Processing Algorithm, and eliminate of the interference of casting billet surface iron scale to thermometric, the temperature gradient that obtains the horizontal different sequential of strand distributes.Simultaneously, the inner temperature-sensitive sensing unit of ccd detector (temperature sensor) detects the internal work temperature, and the control valve of cold gas light path is sent and controlled to the operating temperature signal by Ethernet interface, the flow of refrigerating gas is carried out FEEDBACK CONTROL, to guarantee suitable intensity of cooling.By the light intensity sensor in the thermal insulation protection sleeve pipe of innermost layer optical transmission window (quartz glass) is detected; judge the pollution level of quartz glass according to the light intensity signal that detects; and the magnetic valve of control water spout pipeline; opening time is determined by the magnetic valve inner parameter, silica glass window is cleaned.
Claims (7)
1, continuous casting two cold closed chamber casting blank surface temperature field measuring device, it is characterized in that: it comprises infrared linear array CCD camera (3), cooling collar (6) and thermal insulation protection sleeve pipe (7), be provided with resistant to elevated temperatures quartz glass (2) at thermal insulation protection sleeve pipe (7) front end, infrared linear array CCD camera (3) is located in the thermal insulation protection sleeve pipe (7); Cooling collar (6) is placed in outside the thermal insulation protection sleeve pipe (7), forms gas channel (4) between cooling collar (6) and the thermal insulation protection sleeve pipe (7); Be respectively equipped with inlet gas current divider (5) and exit flow separator (9) in cooling collar (6) rear end and front end, inlet gas current divider (5) is provided with cooling gas inlet (11), refrigerating gas outlet (12) and holding wire outlet (13), refrigerating gas outlet (12) corresponding gas channel (4), the exit flow separator is provided with the refrigerating gas outlet; Be provided with at exit flow separator (9) front end and make air-flow be wire laterally to purge guiding mechanism (10) to casting billet surface.
2, continuous casting two cold closed chamber casting blank surface temperature field measuring device according to claim 1, it is characterized in that: described infrared linear array CCD camera comprises ccd detector, and described ccd detector is that response spectrum is silicon two utmost point Infrared Detectors linear array arrays of 0.95-1.1 μ m.
3, continuous casting two cold closed chamber casting blank surface temperature field measuring device according to claim 1 is characterized in that: described infrared linear array CCD camera comprises ccd detector and optical filter, and optical filter arrowband centre wavelength is 1.0 μ m.
4, according to claim 1 or 2 or 3 described continuous casting two cold closed chamber casting blank surface temperature field measuring devices; it is characterized in that: be provided with wiper mechanism (1) in quartz glass (2) side the place ahead; wiper mechanism comprises aqueduct and is positioned at the aqueduct tail end and facing to the water spout of quartz glass; on aqueduct, be provided with magnetic valve; be provided with in the thermal insulation protection sleeve pipe by detecting the light intensity signal that sees through quartz glass and judge the light intensity sensor of quartz glass pollution level, light intensity sensor is connected with magnetic valve.
5, continuous casting two cold closed chamber casting blank surface temperature field measuring device according to claim 4; it is characterized in that: in the thermal insulation protection sleeve pipe, be provided with temperature sensor; temperature sensor is connected with the refrigerating gas control valve to regulate the refrigerating gas flow, and described temperature sensor is a thermistor.
6, continuous casting two cold closed chamber casting blank surface temperature field measuring device according to claim 5; it is characterized in that: described thermal insulation protection sleeve pipe (7) constitutes by concentric, contour three layers, and infrared linear array CCD camera, temperature sensor and light intensity sensor are positioned at innermost layer thermal insulation protection sleeve pipe.
7, according to claim 5 or 6 described continuous casting two cold closed chamber casting blank surface temperature field measuring devices, it is characterized in that: cooling gas inlet (11) on the inlet gas current divider (5) and holding wire outlet (13) are same mouthful.
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| CN2009101908766A CN101664794B (en) | 2009-09-16 | 2009-09-16 | Continuous casting two cold closed chamber casting blank surface temperature field measuring device |
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| CN2009101908766A CN101664794B (en) | 2009-09-16 | 2009-09-16 | Continuous casting two cold closed chamber casting blank surface temperature field measuring device |
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| CN102632213A (en) * | 2011-02-12 | 2012-08-15 | 沈阳鑫君城电子有限公司 | Method for measuring and controlling surface temperature of casting blank and special device thereof |
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- 2009-09-16 CN CN2009101908766A patent/CN101664794B/en not_active Expired - Fee Related
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| CN102632213A (en) * | 2011-02-12 | 2012-08-15 | 沈阳鑫君城电子有限公司 | Method for measuring and controlling surface temperature of casting blank and special device thereof |
| CN102366763A (en) * | 2011-10-31 | 2012-03-07 | 攀钢集团西昌钢钒有限公司 | Method for controlling rolling temperature of strip materials |
| CN102366763B (en) * | 2011-10-31 | 2013-08-14 | 攀钢集团西昌钢钒有限公司 | Method for controlling rolling temperature of strip materials |
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| CN111399319A (en) * | 2020-03-23 | 2020-07-10 | 冀中能源峰峰集团有限公司 | Real-time dust removal and cooling device and method for camera lens in high-dust environment |
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