CN202343902U - System for detecting internal boundary and solidified tail end of solid phase of continuous casting blank on line - Google Patents
System for detecting internal boundary and solidified tail end of solid phase of continuous casting blank on line Download PDFInfo
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- CN202343902U CN202343902U CN2011204521777U CN201120452177U CN202343902U CN 202343902 U CN202343902 U CN 202343902U CN 2011204521777 U CN2011204521777 U CN 2011204521777U CN 201120452177 U CN201120452177 U CN 201120452177U CN 202343902 U CN202343902 U CN 202343902U
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Abstract
The utility model discloses a system for detecting the internal boundary and the solidified tail end of a solid phase of a continuous casting blank on line. The system comprises a signal generator, electromagnetic ultrasonic transducers, a signal processor, a computer and a controller, wherein the electromagnetic ultrasonic transducers are arranged at the interval with dynamic tight pressing in the casting direction of the continuous casting blank and the setting position of each sector section of upstream and downstream local sections; the upstream and downstream local sections are adjacent to the interval; and the end area of the end, facing the surface of the detected continuous casting blank, of a magnet in the electromagnetic ultrasonic transducer is more than that of the end far away from the surface of the continuous casting blank. The end area of the end, facing the surface of the detected continuous casting blank, of the magnet in the electromagnetic ultrasonic transducer is more than that of the end far away from the surface of the continuous casting blank, so that the system can be used for increasing the signal to noise ratio of electromagnetic ultrasonic waves.
Description
Technical field
The utility model relates to the steel-making continuous casting field, the system of particularly a kind of online detection continuous casting billet solid phase inner boundary and solidification end position.
Background technology
In continuous casting production process,, eliminate defectives such as center porosity and crackle in order to alleviate the continuous casting billet center segregation; Usually technology is gently depressed in employing; Promptly on the basis that roll gap shrinks, the continuous casting billet that solidifies latter stage is carried out shallow draft, stop the formation in continuous casting billet internal contraction space, the contraction in compensation final set stage; Improve the strand internal soundness, like the extension performance that improves steel, welding performance, crack ability etc.
Accurately detecting continuous casting billet solid phase inner boundary and solidification end position is the prerequisite of implementing gently to depress, otherwise just can not confirm drafts and the pressure range gently depressed exactly, if drafts is little, not obvious with the center porosity improvement for center segregation; If drafts greatly then can make the tendency aggravation of continuous casting billet implosion, even the situation that depress roller damages possibly occur.
Pressure range is inaccurate in addition also analogue can occur; If pressure range is confirmed in back, solidification end position; Continuous casting billet use gently depress before defective such as center segregation formed; Owing to no longer have liquid metal in the continuous casting billet, implement this moment gently to depress and metal generation plastic deformation is cracked and can not improve the center segregation that has formed in the continuous casting billet; On the contrary, if pressure range confirms that continuous casting billet still can form defectives such as center segregation and center porosity in front, solidification end position.Therefore, accurately detect continuous casting billet solid phase inner boundary and the solidification end position has a very important role.
Usually people detect the solidification end of continuous casting billet with continuous casting billet solidification and heat transfer model, and come correction model through a series of experimental technique, and traditional experimental technique has bleed-out method, isotope method and method of powder actuated shot.
The bleed-out method is to confirm that according to bleed-out continuous casting billet thickness of the shell coagulation factor, its shortcoming are that shell thickness receives the inaccurate and bleed-out of molten steel scouring dangerous big; Isotope method is to add relevant radio isotope from crystallizer, dissects continuous casting billet then and measures isotopic distribution and confirm that coagulation factor, its shortcoming are that the waste steel billet is serious, and workload greatly and have a radioactive radiation; Method of powder actuated shot is to inject strand with the steel nail that contains FeS, confirms that according to the distribution of steel nail fusing situation and S coagulation factor, its shortcoming are that the waste steel billet is serious, and workload is big.
Experimental cost is big each time, the cycle is long, the big reason of workload can not be done the experiment of all steel grades under different technology conditions owing to bleed-out method, isotope method and method of powder actuated shot all can not continuous on-line detection be added; So existing solidification and heat transfer model and liquid core control model (Liquid Pool Control; Abbreviation LPC), strand tapering automatic control model (Automatic StrandTaper/Thickness Control; Be called for short ASTC) gone into by the solidification end of the feasible continuous casting billet that calculates of factors vary such as pulling rate, steel grade and temperature and the actual bigger difference that has; Quality improvement to continuous casting billet is limited, has satisfied not the requirement of high efficiency continuous casting and is replaced by the electromagnetic acoustic technology.
So-called electromagnetic acoustic technology is to utilize electromagnetic ultrasonic wave sensor (Electromagnetic Acoustic Transducer; Be called for short EMAT) launch electromagnetic ultrasonic wave and make it see through continuous casting billet, the curdled appearance that signal processing unit is judged continuous casting billet according to the propagation time and the attenuation amplitude of electromagnetic ultrasonic wave again.The technical scheme of much utilizing the electromagnetic acoustic technology to detect the continuous casting billet solidification end is arranged at present.
Japan Patent JP52-130422 utilizes electromagnetic acoustic shear wave sensor to continuous casting billet projection electromagnetic acoustic shear wave, and the principle of utilizing the electromagnetic acoustic shear wave can not see through liquid phase is judged the complete curdled appearance of continuous casting billet.Yet the signal that sees through the electromagnetic ultrasonic wave shear wave of continuous casting billet has taken place to weaken or has disappeared and can not just have residual motlten metal in unique judgement foundry goods, because also there is other the factor that causes signal to weaken or disappear.
Japan Patent JP62-148850 uses the electromagnetic ultrasonic wave sensor that can produce electromagnetic acoustic compressional wave and electromagnetic acoustic shear wave simultaneously; The electromagnetic ultrasonic wave signal waveform that sees through continuous casting billet that receives according to receiver; Calculate the electromagnetic acoustic shear wave and judge change and the sensor abnormality that exists residual motlten metal and continuous casting billet to lift away from the foundry goods with the ratio At/Al that the electromagnetic acoustic compressional wave sees through wave amplitude (At) through wave amplitude (Al); Iron core in this scheme is " E " type; Bulky, in the close gap between the limited fan-shaped section roller, be difficult to adapt to.
Japan Patent JP10-197502 measures the resonant frequency of the ultrasonic shear waves in the foundry goods, tries to achieve rate in the foundry goods solid phase according to this resonant frequency.
Japan Patent JP2000-266730 discloses a kind of method that improves S/N (signal to noise ratio) through related operation: use the pulse series shape after selecting at least one to modulate frequency in the regulation pulsewidth, amplitude, the phase place to send signal; And use the contrast signal of or similar waveform identical with this transmission signal, carry out related operation to received signal.In this method, receive the relevant height of signal and transmission signal, noise is relevant low with the transmission signal.
U.S. Pat 2007102134A1 discloses electromagnetic ultrasonic wave sensor and has had the magnetic pole more than 3 at the continuous casting billet width; Have the compressional wave that is wound on configuration around the inboard magnetic pole and use coil with coil with the stacked shear wave of magnetic pole strength; This scheme can not effectively be utilized the horizontal magnetic field towards casting direction; Sensitivity is descended, though adopt adequate measure to prevent that sensitivity from descending, effect is limited.
Detect for solving the electromagnetic ultrasonic wave method that the sensitivity of continuous casting billet solidification end is low, signal to noise ratio (S/N) is low, technical problems such as low precision, the scope that lifts away from that can not enlarge electromagnetic ultrasonic wave sensor and continuous casting billet and long-time continuous measurement stably.Chinese patent CN1198139C discloses a kind of method of measuring the continuous casting billet curdled appearance; This method comprises and is cooled to the top layer part of continuous casting billet to take place the refrigerating work procedure of α phase transformation and sends to the transmission operation of cooled foundry goods to the shear wave of electromagnetic ultrasonic wave as sending signal; Though certain effect is arranged to improving the S/N ratio; But this is to be prerequisite with the quality of damaging continuous casting billet; Because be cooled to take place the α phase transformation to the top layer part of foundry goods, the quality that will inevitably diminish foundry goods is as face crack etc. occurring.
Problems such as the above-mentioned technical scheme of utilizing the electromagnetic acoustic technology to detect the continuous casting billet solidification end exists that S/N is low, low precision, damage billet quality, the scope that lifts away from that can not enlarge electromagnetic ultrasonic wave sensor and continuous casting billet and long-time continuous measurement stably and do not have an example to be successfully applied to the report of practice.
The utility model content
The utility model aims to provide the system of a kind of online detection continuous casting billet solid phase inner boundary and solidification end position, to solve the existing too little technical problem of electromagnetic acoustic method signal to noise ratio S/N.
One side according to the utility model; The system of a kind of online detection continuous casting billet solid phase inner boundary and solidification end position is provided; Comprise signal generator, electromagnetic ultrasonic wave sensor, signal processor, computer and controller; This electromagnetic ultrasonic wave sensor is arranged in the desired location that the continuous casting billet casting direction has each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing, and the magnet face in the electromagnetic ultrasonic wave sensor is big away from the end area of continuous casting billet surface one end to the end area ratio of tested continuous casting billet surface one end.
Further, above-mentioned electromagnetic ultrasonic wave sensor comprises the sensor of launching electromagnetic ultrasonic wave and the sensor that receives electromagnetic ultrasonic wave.
Further, the sensor of above-mentioned emission electromagnetic ultrasonic wave is installed on the continuous casting billet upper and lower surfaces respectively with the sensor that receives electromagnetic ultrasonic wave or is installed in respectively about continuous casting billet on two faces.
Further, the sensor of above-mentioned emission electromagnetic ultrasonic wave and the sensor that receives electromagnetic ultrasonic wave are coaxial respectively is installed on the continuous casting billet upper and lower surfaces or coaxial respectively flatly being installed in about continuous casting billet on two faces vertically.
Further, be installed on up and down arbitrary of continuous casting billet the sensor of above-mentioned emission electromagnetic ultrasonic wave and the sensor homonymy that receives electromagnetic ultrasonic wave.
Further, above-mentioned electromagnetic ultrasonic wave sensor is to integrate emission electromagnetic ultrasonic wave and the sensor that receives the electromagnetic acoustic wave energy.
Further, above-mentioned electromagnetic ultrasonic wave sensor is installed on up and down arbitrary of continuous casting billet.
Further; Said system also comprises drive unit; Drive unit is connected with electromagnetic ultrasonic wave sensor; Drive arrangement has the desired location of each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing at the continuous casting billet casting direction, is used to drive wide the scanning of electromagnetic ultrasonic wave sensor along continuous casting billet.
Further; Said system also comprises positioner; Positioner comprises mount pad and is fixedly connected on the strip installing plate on the mount pad; The bearing of trend of strip installing plate is parallel with the roller of fan-shaped section, and electromagnetic ultrasonic wave sensor is installed on the strip installing plate, and mount pad is set on the connector between adjacent two rollers of fan-shaped section.
Further, the magnet in the above-mentioned electromagnetic ultrasonic wave sensor is permanent magnet or electromagnet.
The utlity model has following technique effect:
Magnet face in the electromagnetic ultrasonic wave sensor is big away from the end area of continuous casting billet surface one end to the end area ratio of tested continuous casting billet surface one end; Can be used to improve the signal to noise ratio of electromagnetic ultrasonic wave; And then the lifting electromagnetic ultrasonic wave sensor is to the distance of continuous casting billet; Can prevent that electromagnetic ultrasonic wave sensor from being broken by continuous casting billet on the one hand, reduce the heat radiation that electromagnetic ultrasonic wave sensor receives on the other hand, prolong service life.
Except top described purpose, characteristic and advantage, other purpose, characteristic and the advantage that the utlity model has are with combining accompanying drawing to do further detailed explanation.
Description of drawings
Constitute the preferred embodiment that the part of this specification, the accompanying drawing that is used for further understanding the utility model show the utility model, and be used for explaining the principle of the utility model with specification.Among the figure:
Fig. 1 is according to the coaxial mounting structure sketch map of the electromagnetic ultrasonic wave sensor heteropleural of continuous casting billet solid phase inner boundary of the utility model and solidification end detection system;
Fig. 2 is the structural representation according to the positioner of the electromagnetic ultrasonic wave sensor of the utility model;
Fig. 3 is according to the continuous casting billet solid phase inner boundary that drive unit is housed of the utility model and the schematic cross-section of solidification end detection system;
Fig. 4 is the sketch map of the drive unit of detection system shown in Figure 3;
Fig. 5 is the magnet profile sketch map according to the electromagnetic ultrasonic wave sensor of the utility model;
Fig. 6 is the magnet profile sketch map according to the electromagnetic ultrasonic wave sensor of the utility model;
Fig. 7 is the vertical view of magnet shown in Figure 6;
Fig. 8 be according to the utility model by launching electromagnetic ultrasonic wave simultaneously and receiving continuous casting billet solid phase inner boundary and the solidification end detection system that electromagnetic ultrasonic wave forms in the sensor of one and adorn sketch map;
Fig. 9 a is according to emission electromagnetic ultrasonic wave shown in Figure 8 and receives electromagnetic ultrasonic wave in the generalized section of the magnet of the sensor of one;
Fig. 9 b is the vertical view of magnet shown in Fig. 9 a;
Figure 10 is the reception signal graph according to the electromagnetic ultrasonic wave sensor of the utility model;
Figure 11 is the flow chart that is applied to the signal processing method of online detection continuous casting billet solid phase inner boundary and solidification end position system; And
Figure 12 is the flow chart of the online test method of continuous casting billet solid phase inner boundary and solidification end.
Description of reference numerals
First embodiment
The sensor of 101 continuous casting billets, 102 emission electromagnetic ultrasonic waves
104 signal generators 110 receive the sensor of electromagnetic ultrasonic wave
106 controllers, 107 computers
108 signal processor 101c solid phases
101b inner boundary 101a motlten metal
113 positioner 113a strip installing plates
113b mount pad 103,109 rollers
112 drive unit 101d solidification ends
102a magnet 102a2 magnet outer face
102a1 magnet inner face 102b hole
112e driven unit 112a electric machine assembly
111 frames
Second embodiment
202 electromagnetic ultrasonic wave sensor 202a magnet
202a2 outer face 202a1 inner face
202b hole 201 continuous casting billets
201a motlten metal 201b inner boundary
201c solid phase 201d solidification end
207 computers, 208 signal processors
206 controllers, 213 positioners.
The specific embodiment
Embodiment to the utility model is elaborated below in conjunction with accompanying drawing, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
Fig. 1 to Fig. 4 shows according to the continuous casting billet solid phase inner boundary of the utility model first embodiment and solidification end detection system.In conjunction with referring to figs. 1 through Fig. 4, the detection system of the utility model comprises: signal generator 104, electromagnetic ultrasonic wave sensor, signal processor 108, computer 107 and controller 106.Signal generator 104 is exported to the sensor 102 of launching electromagnetic ultrasonic wave to the pumping signal that produces, and the sensor 110 that receives electromagnetic ultrasonic wave accepts the electromagnetic ultrasonic wave signal that sees through continuous casting billet of sensor 102 emissions of spontaneous emission electromagnetic ultrasonic wave.
The electromagnetic ultrasonic wave sensor of being made up of the sensor of launching electromagnetic ultrasonic wave 102 and the sensor 110 that receives electromagnetic ultrasonic wave is arranged in the desired location that continuous casting billet 101 casting directions have each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing.Usually, the interval of dynamically gently depressing is that the continuous casting billet solid rate is the interval of 0.3-0.7, can change with the variation of the factors such as temperature of the pulling rate of the flow of secondary cooling water, straightening machine and continuous casting billet and solid rate is interval.Therefore, the beneficial effect of between this solid rate is the roller of fan-shaped section of the interval upstream and downstream partial section of 0.3-0.7, setting electromagnetic ultrasonic wave sensor is: making solid rate is the detection range that the interval of 0.3-0.7 all falls into electromagnetic ultrasonic wave sensor.
The sensor 102 of emission electromagnetic ultrasonic wave is installed on continuous casting billet 101 upper and lower surfaces respectively with the sensor 110 that receives electromagnetic ultrasonic wave or is installed in respectively on about 101 two faces of continuous casting billet.
Usually, on slab caster, the sensor 102 of emission electromagnetic ultrasonic wave is installed in respectively on continuous casting billet 101 upper and lower surfaces with the sensor 110 that receives electromagnetic ultrasonic wave; On square billet or rectangular billet caster machine, the sensor 102 of emission electromagnetic ultrasonic wave is installed in respectively on about 101 two faces of continuous casting billet with the sensor 110 that receives electromagnetic ultrasonic wave.
Preferably, the sensor 102 of emission electromagnetic ultrasonic wave and the sensor 110 that receives electromagnetic ultrasonic wave are coaxial respectively is installed on continuous casting billet 101 upper and lower surfaces or coaxial respectively flatly being installed in about continuous casting billet on two faces vertically.The sensor of launching electromagnetic ultrasonic wave this moment and the sensor that receives electromagnetic ultrasonic wave each with a magnet 102a independently, wherein, coaxially be meant two independently centerline collineations of magnet 102a.
Alternatively; The sensor of emission electromagnetic ultrasonic wave is installed on the continuous casting billet arbitrary face up and down with the sensor homonymy ground that receives electromagnetic ultrasonic wave, and the sensor of launching electromagnetic ultrasonic wave this moment and the sensor that receives electromagnetic ultrasonic wave are respectively with a magnet 102a independently.
For detecting distribution (continuous casting billet in motlten metal 101a be the cross direction profiles of the liquid core) situation of continuous casting billet 101 solid phase 101c inner boundary 101b along wide direction of continuous casting billet; Can arrange the sensor 102 and the sensor 110 that receives electromagnetic ultrasonic wave of a plurality of emission electromagnetic ultrasonic waves in wide direction of continuous casting billet through sensor locator 113; This quantity is many more; Detected continuous casting billet solid phase inner boundary precision is high more, as on the wide continuous casting billet of 1800mm, can be provided with 3-5 usually.
As shown in Figure 2, sensor locator 113 comprises strip installing plate 113a and mount pad 113b.This strip installing plate 113a is fixed on the side of mount pad 113b and the axially parallel of the through hole of the bearing of trend of strip installing plate 113a and mount pad 113b through screw thread.That is to say, mount pad 113b and roller 103 coaxial settings, strip installing plate 10 laterally arranges with roller 103.This mount pad 113b is provided with the through hole with preset diameters, this through-hole diameter can and two axial adjacent roller 103 between the external diameter of connector adapt, mount pad 113b and connector are closely cooperated to avoid slip.The sensor 102 of emission electromagnetic ultrasonic wave and the sensor 110 that receives electromagnetic ultrasonic wave be separately fixed at above the continuous casting billet 101 through sensor locator 113 and below adjacent two rollers 103, between 109.
Preferably; The sensor 102 that drives the emission electromagnetic ultrasonic waves through drive unit 112 and the sensor that receives electromagnetic ultrasonic wave 110 be simultaneously along wide scanning of continuous casting billet, one group of electromagnetic ultrasonic wave sensor of being made up of the sensor 102 of an emission electromagnetic ultrasonic wave and the sensor 110 of a reception electromagnetic ultrasonic wave then only need be set also can detect the distribution situation of continuous casting billet 101 solid phase 101c inner boundary 101b along wide direction of continuous casting billet.This drive arrangement has the desired location of each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing at the continuous casting billet casting direction.
For detecting continuous casting billet solidification end 101d (motlten metal 101a is vertical distribution of liquid core in the continuous casting billet) situation, there is the desired location of each fan-shaped section of the interval and adjacent upstream and downstream partial section of dynamically gently depressing to arrange the plurality of electromagnetic ultrasonic sensor with this interval at continuous casting billet 101 casting directions.
Like Fig. 5 and shown in Figure 6; Magnet 102a in the above-mentioned electromagnetic ultrasonic wave sensor compares the end area big (this magnet abbreviates mushroom-shaped magnet as) away from the inner face 102a1 on continuous casting billet surface towards the end area of the outer face 102a2 on tested continuous casting billet surface, is used to improve the S/N ratio of electromagnetic ultrasonic wave.Preferably, the center of this magnet is provided with and is used for the hole 102b that coil passes through.
The electromagnetic ultrasonic wave sensor made from mushroom-shaped magnet and cylindrical magnet commonly used detects same continuous casting billet, and the signal amplitude numerical value of gained is as shown in the table.
Al representes electromagnetic acoustic compressional wave range value, and At representes electromagnetic acoustic shear wave range value, and Al/At representes the ratio of compressional wave amplitude and shear wave amplitude, and under the identical situation of other condition, the multiplication factor of mushroom-shaped magnet electromagnetic ultrasonic wave sensor has reduced by 10 times.
Data according to 9,10 sections; The compressional wave amplitude that the cylinder-shaped magnet electromagnetic ultrasonic wave sensor is measured and the ratio of shear wave amplitude are respectively 6.58 measured (10.4/1.58) of mushroom-shaped magnet electromagnetic ultrasonic wave sensor times and 4.9 (4.4/0.9) times; 5.74 times of average out to, this amplitude that shows the relative compressional wave of mushroom-shaped magnet electromagnetic acoustic shear wave has improved 5.74 times.
The multiplication factor of mushroom-shaped magnet electromagnetic ultrasonic wave sensor has reduced by 10 times; This shows if under the identical condition of multiplication factor; The measured A1 of mushroom-shaped magnet electromagnetic ultrasonic wave sensor be respectively 3.3 measured (21.2/6.46) of cylinder-shaped magnet electromagnetic ultrasonic wave sensor and 2.5 (11.3/4.54) doubly, 2.9 times of average out to; And the measured shear wave amplitude A t of mushroom-shaped magnet electromagnetic ultrasonic wave sensor is 16.6 measured (5.74*2.9) of cylinder-shaped magnet electromagnetic ultrasonic wave sensor times.
Magnet in the utility model electromagnetic ultrasonic wave sensor is arranged to another mushroom-shaped benefit: be convenient to install in the confined space of magnet between adjacent two rollers of fan-shaped section.
Magnet in the utility model electromagnetic ultrasonic wave sensor is permanent magnet or electromagnet, and electromagnetic ultrasonic wave sensor emission and/or the electromagnetic ultrasonic wave of accepting are electromagnetic acoustic shear wave and/or electromagnetic acoustic compressional wave.
In the present embodiment; With the sensor 102 and coaxial respectively being installed in vertically on continuous casting billet 101 upper and lower surfaces of sensor 110 that receives electromagnetic ultrasonic wave of emission electromagnetic ultrasonic wave, the magnet of electromagnetic ultrasonic wave sensor is permanent magnet and uses drive unit 112.
As shown in Figure 4; The sensor 110 that receives electromagnetic ultrasonic wave is through on the reception electromagnetic ultrasonic wave sensor support bar 112d that is threadedly connected to drive unit 112; Electromagnetic ultrasonic wave sensor support bar 112d and on electromagnetic ultrasonic wave sensor 110 be fixed on the driven unit 112e through bracket component 112b, electric machine assembly 112a be connected through shaft coupling with driven unit 112e and drive electromagnetic ultrasonic wave sensor support bar 112d and on electromagnetic ultrasonic wave sensor 110 prolong or shorten to be used for electromagnetic ultrasonic wave sensor 110 and come flyback retrace along wide of continuous casting billet 101.
Driven unit 112e is fixed on the installing rack 112c; And installing rack 112c is connected with the frame 111 of fan-shaped section and guarantees through bolt 112f a distance is arranged between sensor and the continuous casting billet 101; This distance reaches 6mm, still can detect electromagnetic ultrasonic wave signal through continuous casting billet reliably; And dummy bar collision electromagnetic ultrasonic wave sensor damages the problem of sensor when having avoided sending dummy bar before the conticaster production with producing tail base collision electromagnetic ultrasonic wave sensor when finishing; Thereby the raising sensor reliability, the service life of prolongation sensor.
The sensor 102 of emission electromagnetic ultrasonic wave also is fixed on the frame of fan-shaped section 111 through drive unit 112 with above-mentioned similar mode.
In the utility model, the sensor of emission electromagnetic ultrasonic wave is meant the sensor that can launch electromagnetic acoustic shear wave and electromagnetic acoustic compressional wave simultaneously; The sensor that receives electromagnetic ultrasonic wave is meant the sensor that can launch electromagnetic acoustic shear wave and electromagnetic acoustic compressional wave simultaneously.
The control system of controller 106 and computer 107 and conticaster is electrically connected and according to the flow of the position adjustments caster two cold water of solid phase 101c inner boundary 101b and solidification end 101d, pulling rate and the drafts of gently depressing and the reduction ratio of straightening machine.
Fig. 7 to Fig. 9 b shows according to the continuous casting billet solid phase inner boundary of the utility model second embodiment and solidification end detection system.In conjunction with reference to Fig. 7 to Fig. 9 b; Electromagnetic ultrasonic wave sensor 202 is formed in the sensor of one with the reception electromagnetic ultrasonic wave by launching electromagnetic ultrasonic wave simultaneously; At this moment, the sensor of emission electromagnetic ultrasonic wave and the shared magnet 202a of sensor (shown in Fig. 9 a and Fig. 9 b) that receives electromagnetic ultrasonic wave.
Fig. 9 a and Fig. 9 b show the structure of magnet 202a; Shown in Fig. 9 a and Fig. 9 b; Magnet 202a in the electromagnetic ultrasonic wave sensor is big away from the area of the inner face 202a1 on continuous casting billet surface towards the area ratio of the outer face 202a2 on tested continuous casting billet surface, is used to improve the S/N ratio of electromagnetic ultrasonic wave.Preferably, the center of this magnet is provided with and is used for the hole 202b that coil passes through.End face 202a1 and end face 202a2 are Long Circle.
This electromagnetic ultrasonic wave sensor 202 can be installed on the continuous casting billet 201 arbitrary face up and down, be preferably mounted in the present embodiment continuous casting billet 201 above.The structure of present embodiment electromagnetic ultrasonic wave sensor 202 not only can reduce the quantity of electromagnetic ultrasonic wave sensor and sensor locator or drive unit and practice thrift cost, and installation and maintenance become more convenient.
Electromagnetic ultrasonic wave sensor 202 is fixed between two adjacent above the continuous casting billet 201 rollers 203 through sensor locator 213 and guarantees has a distance between sensor and the continuous casting billet 201; This distance reaches 6mm, still can detect electromagnetic ultrasonic wave signal through continuous casting billet reliably; And the dummy bar when having avoided sending dummy bar before the conticaster production, produce the tail base of continuous casting billet when finishing and the continuous casting billet collision electromagnetic ultrasonic wave sensor 202 of beating and the problem damaged; Thereby improved the reliability of electromagnetic ultrasonic wave sensor, prolonged the service life of electromagnetic ultrasonic wave sensor.
Alternatively; Electromagnetic ultrasonic wave sensor 202 also can drive wide the scanning of electromagnetic ultrasonic wave sensor 202 along continuous casting billet 201 through drive unit, and then only an electromagnetic ultrasonic wave sensor 202 need be set just can detect the distribution situation of continuous casting billet 201 solid phase 201c inner boundary 201b along wide direction of continuous casting billet on wide of continuous casting billet.This drive arrangement has the desired location of each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing at the continuous casting billet casting direction.
Figure 11 is the flow chart that is applied to the signal processing method of online detection continuous casting billet solid phase inner boundary and solidification end position system; This signal processing method comprises: step S109, and the reception signal waveform of the electromagnetic ultrasonic wave sensor that promptly is shifted is to assigned address (being called for short displacement); Step S111, promptly the reception signal waveform to the electromagnetic ultrasonic wave sensor that is displaced to assigned address adds and average (abbreviation adds with average).
Because the variation of conticaster working condition causes continuous casting billet interior tissue such as column crystal, equiax crystal to put up a bridge and follow variation; The position and the amplitude that see through the electromagnetic ultrasonic wave signal Sl (electromagnetic acoustic compressional wave) of continuous casting billet and sensor acceptance its appearance of back that St (electromagnetic acoustic shear wave) is received electromagnetic ultrasonic wave are also changing constantly; As measuring position that τ t occurs the time lag that transmits of the relative electromagnetic acoustic shear wave of reception signal of measuring τ l and electromagnetic acoustic shear wave the time lag that transmits of the relative electromagnetic acoustic compressional wave of reception signal of electromagnetic acoustic compressional wave along with the time is constantly changing; But should change all in certain scope; Pass through the inferior efficiently sampling of N1 (as 4096), add up the τ value that the most probable rate promptly distributes the closeest on N1 τ l, τ t value time and be decided to be τ
c l, τ
c tThe time lag amount of the most probable rate that transmits that promptly is respectively the relative electromagnetic acoustic compressional wave of reception signal of electromagnetic acoustic compressional wave (is measured τ the time lag of being called for short electromagnetic acoustic compressional wave most probable rate
c l) and amount time lag of the most probable rate that transmits of the relative electromagnetic acoustic shear wave of reception signal of electromagnetic acoustic shear wave (measure τ the time lag of being called for short electromagnetic acoustic shear wave most probable rate
c t).
All be displaced to assigned address such as τ to electromagnetic acoustic compressional wave signal and electromagnetic acoustic shear wave signal respectively then with τ l, τ t point
c l, τ
c tAdd and on average obtain adding and averaged amplitude value of electromagnetic acoustic compressional wave signal
Adding and averaged amplitude value of electromagnetic acoustic shear wave signal
If carrying out above-mentioned shifting processing, electromagnetic ultrasonic wave signal Sl that changes constantly and St just do not add with average; Can make that then receiving the electromagnetic ultrasonic wave signal becomes littler, be difficult to be used for to analyze the solid phase inner boundary of continuous casting billet and the distance that promotes between electromagnetic ultrasonic wave sensor and the continuous casting billet is said nothing of in the position of solidification end.
Alternatively, the electromagnetic ultrasonic wave signal is carried out shifting processing with add with average before, can screen processing to signal, promptly with greater than certain numerical value of noise amplitude as discriminating threshold, only allow signal greater than this discriminating threshold through (be called for short and screen).
Alternatively; The electromagnetic ultrasonic wave signal is carried out shifting processing with add with average before; Can also carry out related operation to signal; As in the reception signal of electromagnetic ultrasonic wave, selecting continuous three ripples relevant, show continuous three ripples that amplitude is bigger in the middle of only selecting from 5 Poris like Figure 10 with the amplitude that transmits, the waveform of electromagnetic ultrasonic wave.
Figure 12 is the flow chart according to the online test method of continuous casting billet solid phase inner boundary of the utility model and solidification end system.The online test method of the utility model comprises the steps: S101: signal generator produces the emission that pumping signal is used to trigger electromagnetic ultrasonic wave; S103: electromagnetic ultrasonic wave sensor emission electromagnetic ultrasonic wave and/or reception electromagnetic ultrasonic wave; S105: signal processor carries out the frequency-selecting amplification to the reception signal of electromagnetic ultrasonic wave sensor; S107: computer carries out related operation to the reception signal of the electromagnetic ultrasonic wave sensor that signal processor processes is crossed; S109: the reception signal waveform of displacement electromagnetic ultrasonic wave sensor is to assigned address; S111: the reception signal waveform to the electromagnetic ultrasonic wave sensor that is displaced to assigned address adds with average; S113: provide continuous casting billet solid phase inner boundary and solidification end position.
Wherein, Electromagnetic ultrasonic wave sensor is distributed in the desired location that the continuous casting billet casting direction is provided with each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing, and the magnet face in the electromagnetic ultrasonic wave sensor is big away from the end area of continuous casting billet surface one end to the end area ratio of tested continuous casting billet surface one end;
Related operation is meant the ripple that the reception signal of the electromagnetic ultrasonic wave sensor that the select-out signal processor processes is crossed is relevant with the pulsewidth that transmits, frequency, amplitude and the waveform of electromagnetic ultrasonic wave sensor.
Preferably,, also can use the electromagnetic ultrasonic wave sensor drive unit for reducing the quantity of electromagnetic ultrasonic wave sensor along wide layout of continuous casting billet, be used to drive electromagnetic ultrasonic wave sensor along wide scanning of continuous casting billet to obtain solid phase inner edge boundary line.
Computer gives solid billet inner boundary and solidification end position refers to a computer based on the average signal after addition and extraction plus and the average amplitude value
and the electromagnetic ultrasonic wave sensor receives electromagnetic ultrasonic wave sensor signal corresponding transmitted signal for a time lag τ analysis gives solid billet inner boundary and solidification end position.
Alternatively, add and averaged amplitude value
Comprise adding and averaged amplitude value of electromagnetic acoustic shear wave
And/or the electromagnetic acoustic compressional wave adds and averaged amplitude value
Measure τ the time lag of measuring τ time lag and be the most probable rate in the given sampling time section
c
Preferably, measure τ the time lag of most probable rate
cMeasure τ the time lag that comprises electromagnetic acoustic shear wave most probable rate
c tAnd/or the time lag of electromagnetic acoustic compressional wave most probable rate measure τ
c l
Alternatively, computer was screened processing to signal waveform at the shift signal waveform before assigned address.
Preferably, the computer position that provides continuous casting billet solid phase inner boundary and solidification end is meant and provides adding and averaged amplitude value of electromagnetic acoustic shear wave
Be the position of continuous casting billet solid phase inner boundary and solidification end less than the area limit line of assign thresholds, and the adding and amplitude mean value of electromagnetic acoustic compressional wave
And the time lag of electromagnetic acoustic shear wave most probable rate measure τ
c tWith measure τ the time lag of electromagnetic acoustic compressional wave most probable rate
c lThere is booster action position to confirming continuous casting billet solid phase inner boundary and solidification end.
Add and averaged amplitude value
Descend gradually to the moving process of center from the border of continuous casting billet or constant and most probable rate is measured τ time lag with electromagnetic ultrasonic wave sensor
cRise to liquid core moving process from the border of continuous casting billet or constant with electromagnetic ultrasonic transducer.
When detecting the position of continuous casting billet solid phase inner boundary and solidification end; Controller capable of using is according to the pulling rate and the drafts of gently depressing of the flow of the position adjustments secondary cooling water of solid phase inner boundary and solidification end, straightening machine and depress speed, thereby realizes the technology controlling and process gently depressed dynamically.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (10)
1. the system of online detection continuous casting billet solid phase inner boundary and solidification end position; Comprise signal generator, electromagnetic ultrasonic wave sensor, signal processor, computer and controller; It is characterized in that; Said electromagnetic ultrasonic wave sensor is arranged in the desired location that the continuous casting billet casting direction has each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing, and the magnet face in the said electromagnetic ultrasonic wave sensor is big away from the end area of continuous casting billet surface one end to the end area ratio of tested continuous casting billet surface one end.
2. system according to claim 1 is characterized in that, said electromagnetic ultrasonic wave sensor comprises the sensor of launching electromagnetic ultrasonic wave and the sensor that receives electromagnetic ultrasonic wave.
3. system according to claim 2 is characterized in that, the sensor of the sensor of said emission electromagnetic ultrasonic wave and said reception electromagnetic ultrasonic wave is installed on the continuous casting billet upper and lower surfaces respectively or is installed in respectively about continuous casting billet on two faces.
4. system according to claim 3; It is characterized in that the sensor of the sensor of said emission electromagnetic ultrasonic wave and said reception electromagnetic ultrasonic wave is coaxial respectively to be installed on the continuous casting billet upper and lower surfaces or coaxial respectively flatly being installed in about continuous casting billet on two faces vertically.
5. system according to claim 2 is characterized in that, is installed on up and down arbitrary of continuous casting billet the sensor homonymy of the sensor of said emission electromagnetic ultrasonic wave and said reception electromagnetic ultrasonic wave.
6. system according to claim 1 is characterized in that, said electromagnetic ultrasonic wave sensor is to integrate emission electromagnetic ultrasonic wave and the sensor that receives the electromagnetic acoustic wave energy.
7. system according to claim 6 is characterized in that, said electromagnetic ultrasonic wave sensor is installed on up and down arbitrary of continuous casting billet.
8. system according to claim 1; It is characterized in that; Also comprise drive unit; Said drive unit is connected with said electromagnetic ultrasonic wave sensor, and said drive arrangement has the desired location of each fan-shaped section of interval and adjacent with this interval upstream and downstream partial section of dynamically gently depressing at the continuous casting billet casting direction, is used to drive wide the scanning of said electromagnetic ultrasonic wave sensor along continuous casting billet.
9. system according to claim 1; It is characterized in that; Also comprise positioner, said positioner comprises mount pad and is fixedly connected on the strip installing plate on the said mount pad that the bearing of trend of said strip installing plate is parallel with the roller of fan-shaped section; Said electromagnetic ultrasonic wave sensor is installed on the said strip installing plate, and said mount pad is set on the connector between adjacent two rollers of fan-shaped section.
10. according to each described system in the claim 1 to 9, it is characterized in that the magnet in the said electromagnetic ultrasonic wave sensor is permanent magnet or electromagnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204521777U CN202343902U (en) | 2011-11-15 | 2011-11-15 | System for detecting internal boundary and solidified tail end of solid phase of continuous casting blank on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204521777U CN202343902U (en) | 2011-11-15 | 2011-11-15 | System for detecting internal boundary and solidified tail end of solid phase of continuous casting blank on line |
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| Publication Number | Publication Date |
|---|---|
| CN202343902U true CN202343902U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204521777U Expired - Fee Related CN202343902U (en) | 2011-11-15 | 2011-11-15 | System for detecting internal boundary and solidified tail end of solid phase of continuous casting blank on line |
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| Country | Link |
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| CN (1) | CN202343902U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500747A (en) * | 2011-11-15 | 2012-06-20 | 田志恒 | Online detection system for solid-phase internal boundaries and solidification end positions of continuous casting blanks and method |
| WO2016038124A1 (en) * | 2014-09-10 | 2016-03-17 | Sms Group Gmbh | Detecting a material quality of a metallic casting product |
| CN105965501A (en) * | 2016-05-31 | 2016-09-28 | 武汉钢铁股份有限公司 | Automatic positioning device and automatic positioning control method for sector section replacement manipulator |
-
2011
- 2011-11-15 CN CN2011204521777U patent/CN202343902U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500747A (en) * | 2011-11-15 | 2012-06-20 | 田志恒 | Online detection system for solid-phase internal boundaries and solidification end positions of continuous casting blanks and method |
| WO2016038124A1 (en) * | 2014-09-10 | 2016-03-17 | Sms Group Gmbh | Detecting a material quality of a metallic casting product |
| CN105965501A (en) * | 2016-05-31 | 2016-09-28 | 武汉钢铁股份有限公司 | Automatic positioning device and automatic positioning control method for sector section replacement manipulator |
| CN105965501B (en) * | 2016-05-31 | 2018-07-17 | 武汉钢铁有限公司 | A kind of fan-shaped section replaces manipulator automatic positioning equipment and automatic positioning control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20151115 |
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| EXPY | Termination of patent right or utility model |