CN103182491A - Control method and device for thin-strip continuous casting free loop - Google Patents
Control method and device for thin-strip continuous casting free loop Download PDFInfo
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- CN103182491A CN103182491A CN2011104569198A CN201110456919A CN103182491A CN 103182491 A CN103182491 A CN 103182491A CN 2011104569198 A CN2011104569198 A CN 2011104569198A CN 201110456919 A CN201110456919 A CN 201110456919A CN 103182491 A CN103182491 A CN 103182491A
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Abstract
The invention discloses a control method and device for a thin-strip continuous casting free loop. The control device comprises a swing guide plate, a drive hydraulic cylinder of the swing guide plate, and a loop height detection device arranged on the outer side under the swing guide plate, wherein a displacement sensor is arranged on the swing guide plate; both the loop height detection device and the displacement sensor are electrically connected with a loop guide controller; the loop guide device is arranged in front of a horizontal conveying roller path and comprises a loop guide roller set with variable curvature and a corresponding drive hydraulic cylinder; a sensor capable of detecting position data of a loop contact point is arranged on the loop guide roller set; and the loop guide controller is electrically connected with a servo valve for driving the hydraulic cylinder. When the parameter such as the thickness, the loop height or the like of a cast strip is changed, the bending radius of the cast strip guide profile of the loop guide device can be adjusted to be greater than the minimal bending radius capable of leading the cast strip to generate cracks so as to guarantee the cast strip to have no cracks and obtain good quality of the cast strip.
Description
Technical field
The present invention relates to continuous casting process and equipment, particularly the free loop control method of a kind of thin strap continuous casting and device.
Background technology
The twin-roll thin strip continuous casting technology is a kind of advanced person's short flow process metallurgical technology.
As shown in Figure 1, directly molten steel is cast in a chill roll 1a who relatively rotates and can cool off fast by two, 1b and side seal board 2a, in the molten bath that 2b surrounds, the peripheral surface that molten steel is rotated at chill roll is cooled and solidifies, and then the formation solidified shell is also grown then at two chill roll 1a gradually, minimum place, 1b roll gap crack is pressed together, form casted steel belt 4, casted steel belt 4 is via guide plate 5 guiding kink guide roller 12 and pinch rolls 6, and at kink guide roller 12 and chill roll 1a, form kink 3 between the 1b, be rolled into strip by milling train 7 then, band steel after rolling drives through spray cooling device 9 by rollgang 8 and cools off, and sends into coiling machine 11 through coiling clamp roller 10 and batches.
In thin strap continuous casting is produced, need carry out tension free rolling or part power a little rolling in order to obtain high-quality band steel, so, design remains with the Cast Strip redundant segments (being called free kink herein) of certain-length between milling train and casting machine, is used for cushioning the impact to the Cast Strip under the situation because the speed of casting machine and milling train does not match etc.In typical thin strap continuous casting is produced, the position that forms former and later two end points of free kink usually is not contour, if the supposition Cast Strip is inelastic object, only be subjected under the effect of gravity, its formed kink curve shape is followed catenary formula (hyperbolic cosine function curve, formula 1) substantially, and it is as shown in Figure 2 formed, among the figure minimum point of kink be A (0, a).
In this article, the height H of the free kink in Cast Strip is defined as kink guide roller 12 and the last plane of follow-up roller-way conveying casted steel belt and the difference in height of free kink minimum point.
Can cause the minimum bending radius that the Cast Strip cracks, calculate by following formula,
Comprehensive above-mentioned two formulas can get minimum Cast Strip bending radius r
Min:
Wherein: h-Cast Strip thickness, mm.
ρ-Cast Strip bending radius, mm.
σ
bThe strength degree of-material, MPa.
The elastic modelling quantity of E-material, GPa.
Annotate: formula (2)-(4) are referring to " mechanics of materials I ", and Dan Huizu is outstanding, Higher Education Publishing House.2002，P135。
According to typical thin strap continuous casting technology arrangement scheme shown in Figure 1, on the one hand, at an end of the free kink in Cast Strip---the Cast Strip 4 that forms kink is bigger with the bending radius of kink guider 12 contact positions.Along with the increase of looper height, the Cast Strip is born tension in kink guider 12 places and is increased gradually, and corresponding Cast Strip bending radius herein then can diminish gradually.If the bending radius r of Cast Strip on guider
aAllow bending radius r less than the Cast Strip limit described in the formula (4)
Min, then, the crooked stress that produces has surpassed the strength degree of material, can cause the appearance of surface, Cast Strip perpendicular to the transversal crack of Cast Strip direction of advance.
On the other hand, the looper height of Cast Strip increases the bending radius r that also can cause the kink bottom
bDiminish, according to formula (4), can cause that equally also the Cast Strip cracks if Cast Strip bending radius herein is too small.
So, for fear of in casting cycle, cracking owing to bending radius is too small at kink guider place and kink bottom owing to some changes in process parameters causes the Cast Strip, need meet following formula: r at the Cast Strip at above-mentioned two places actual flexion radius
a＞r
MinAnd r
b＞r
Min
Based on above-mentioned purpose and thinking, the following method and apparatus that detects and control the free kink of thin strap continuous casting is proposed.
The looper height checkout gear can adopt infrared ray to add the detecting instrument of light sensation battery forms, also can be the kink detecting instrument of CCD form.The infrared kink detector here, its basic principle is to use rotation mirror drum scanned infrared line, when the red heat target in its visual field is sent infrared ray, mirror drum reflexes to radiation and measures on the battery, battery is converted to the measurement pulse signal with optical signal, an intrinsic reference burst signal of this pulse signal and detection system compares and obtains phase difference, produce an analog signal, this pulse signal is directly proportional with scan angle α, can obtain the height of kink according to the distance between kink bottom and the detector.Concrete detection principle this paper is not discussed, and has set forth similar method and principle in Chinese patent CN201010103388.X and CN201010103389.4.
Summary of the invention
The object of the present invention is to provide the free loop control method of a kind of thin strap continuous casting and device, when parameters such as the thickness of Cast Strip, looper height change, can regulate the bending radius of the Cast Strip guide-contour of kink guider, make it greater than causing the minimum bending radius that the Cast Strip cracks, thereby guarantee the Cast Strip flawless, obtain good casting strip quality.The present invention also is applicable to the free kink that detects and control hot strip steel.
For achieving the above object, technical scheme of the present invention is:
The free loop control method of a kind of thin strap continuous casting comprises the steps:
A) at the kink guider position sensor is set, can detects Cast Strip contacting points position on the kink guider in real time, this kink guider is provided with the guide roller of some arranged parallel, and formation can change the kink guide roller group of curvature;
B) at the casting initial stage, the Cast Strip delivery head that all guide roller upper surfaces form on the kink guider is consistent with subsequent delivery roller-way height, swing guide lifts, its terminal flat segments keeps highly consistent with the kink guider, guarantees that the Cast Strip is transported to the subsequent delivery roller-way by swing guide and kink guider smoothly;
C) after the Cast Strip enters subsequent handling, the swing guide bottom, the kink guider drops to its initial target location, meanwhile milling train to the device rate between the coiling machine less than main frame speed, form and reach the initial target height value H of setting until the free kink in Cast Strip
0, the looper height checkout gear detects the height of the free kink in Cast Strip; The efficient cover curves of calculation of parameter such as kink contacting points position data, looper height data and Cast Strip thickness that the kink guide controller records according to the kink guider, and according to the bending radius r of this curve judgement Cast Strip at kink guider place
aBending radius r with kink minimum point place
bWhether greater than minimum bending radius r
Min, as wherein each is false, then by regulating looper height or regulating kink guiding dress
The guiding curvature of putting makes the two all satisfy r
a＞r
MinAnd r
b＞r
Min, if wherein two all untenable, then preferentially regulate the looper height value;
D) if in the casting cycle, looper height does not change, and then, keeps the bending radius of existing kink guider and looper height to finish until casting.
The free kink control device of thin strap continuous casting of the present invention comprises swing guide and drives hydraulic cylinder that it also comprises, the looper height checkout gear is arranged at the outside under the swing guide; The driving oil cylinder of described swing guide is provided with displacement transducer, and swing guide has bigger crooked radian, and its end is flat segments, and is consistent with subsequent delivery roller-way height when being raised up on it working position under the hydraulic cylinder effect; Looper height checkout gear and displacement transducer all electrically connect with a kink guide controller; The kink guider, be arranged at the horizontal feed roller-way before, it is formed for kink guide roller group, location roller and the corresponding hydraulic cylinder that drives that it is a cover can change curvature, wherein the guide roller group is made up of the guide roller of some arranged parallel; Establish the sensor that can detect the kink contacting points position on the kink guide roller group; Described kink guide controller and this sensor, the servo valve that drives above-mentioned hydraulic cylinder and displacement transducer electrically connect.
Further, described kink guide roller group comprises, some guide rollers and the location roller that can measure the kink contact position, and guide roller, location roller are arranged side by side, and the location roller is arranged at intervals between two guide rollers; The guide roller support end is installed on the rocking arm, and can be around self axis rotation, and adjacent guide roller is connected by rocking arm between two rollers, and location roller rotating shaft two ends are connected in rocking arm between this two roller, forms a cover guide roller unit; Adjacent guide roller unit can be swung by rocking arm around between roller mutually, thereby makes guide roller group outline have transformable guiding radian; Between respective roller on the rocking arm two rotating shaft ends of adjacent guide roller drive sprocket be set connect, wherein a drive sprocket connects a drive motors; Described location roller shaft head is established sensor or generating motor; At least one cover drives hydraulic cylinder, is connected in above-mentioned with rocking arm between roller; Wherein be installed in the bearing block near first guide roller rotating shaft of subsequent delivery roller-way two ends, bearing block is arranged at the base that is fixed on the casting machine basis.
Again, rocking arm connects a cover driving hydraulic cylinder respectively between described each roller.
Establish displacement transducer behind the hydraulic cylinder of rocking arm between described driven roller, and electrically connect the kink guide controller.
The invention has the advantages that:
1, can detect the shape of the free kink of band steel accurately, can make the Cast Strip steel freely carry out the transition on the rollgang by the guide plate curvature of adjusting free kink low spot place, can be because of not causing the crooked excessive surface that causes, Cast Strip crackle to occur, and then influence surface quality of casting belt.
2, can adjust the bending curvature at band outlet place according to different looper heights in real time, carry out dynamic adjustments, can satisfy the various working requirement, Technological adaptability is strong.
3, in the kink adjustment process, looper height and speed etc. is closed-loop control, and disturbing factor is fewer in the theory of the system control model, and factor is all controlled and be easy to detect and controlled, so the stability of a system is good.
The difference of the present invention and prior art and improvements:
Adopt the height of direct contact type detection kink below the cover of back among day JP09308948A of the present invention and the JP4266458, control the height of kink then by the speed of pinch roll, do not go into the bending curvature of considering described in the present invention before kink carries out the transition to horizontal segment in these patents and change the problem that may cause the Cast Strip to crack, the stable control of just looper height that solves.
Mention a kind of design and using method of strip caster kink director element in the US Patent No. 20100000705, namely have a roller diameter in the kink guider at least between 200～650mm, and be lower than other roller.Declare in the literary composition that looper height passes through pinch roll speed control, and the starting point of control kink be guarantee at nip point place, kink bottom, kink to the maximum of Cast Strip, three positions stress absolute value sums such as rollgang place less than 0.2%[σ]-0.4%[σ].
The described method difference of the present invention and this patent is:
1. be in order to reduce kink to the suffered stress in Cast Strip, rollgang place equally, the diameter of its first guide roller and is lower than other roller in the kink guider that this patent adopts between 200～650mm.This requirement of nothing among the present invention adopts the mode of controlling the formed Cast Strip of a series of rollers guide-contour to control Cast Strip and the stress through the guiding dress time because be used for the device of control Cast Strip stress among the present invention.
2. adopt method measurement looper heights such as CCD in this patent, and at the kink guider method and the device that detects kink position, Cast Strip is installed among the present invention, can determine kink shape and position more accurately, be beneficial to kink control.
3. the kink guider among the present invention can online real-time measurement and is regulated the Cast Strip guide-contour, and does not similarly set forth in this patent.
Description of drawings
Fig. 1 is the thin strap continuous casting process schematic representation.
Fig. 2 is looper height detection range schematic diagram of the present invention.
Fig. 3 is kink guider casting initial stage operating position schematic diagram among the present invention.
Fig. 4 is kink guider casting stabilization sub stage operating position schematic diagram among the present invention.
Fig. 5 is the embodiment of the invention 1 kink guider schematic perspective view.
Fig. 6 is the embodiment of the invention 1 kink guider original state schematic diagram.
Fig. 7 is the embodiment of the invention 1 kink guider working state schematic representation.
Fig. 8 is the control principle schematic diagram of the embodiment of the invention 2.
The specific embodiment
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
Referring to Fig. 2～Fig. 7, the free loop control method of a kind of thin strap continuous casting of the present invention comprises the steps:
A, at the casting initial stage, swing guide 5 lifts, be located thereon working position, Cast Strip kink guider 12 lifts, keep its all formed Cast Strip of roller upper surface delivery head consistent with subsequent delivery roller-way height, the least significant end roll surface of the upper surface of swing guide 5 and Cast Strip kink guider 12 is bordered on, and keeps the height unanimity of the two connection, as Fig. 3, the Cast Strip can be transported to subsequent delivery roller-way 8 by swing guide and kink guider smoothly.
After b, Cast Strip entered subsequent handling, swing guide 5 was rocked to its working position down.And Cast Strip kink guider 12 slowly drops to its initial target location at this moment, and meanwhile the device rate at milling train and its rear portion forms and reach the initial target height value H of setting less than main frame speed until the free kink in Cast Strip
0, Cast Strip kink guider 12 stop motions, as shown in Figure 4.Data such as the detection data of the kink guide controller 18 of this moment by analyzing looper height checkout gear 15, kink contacting points position data that Cast Strip kink guider 12 records and Cast Strip thickness, calculate the kink curve, and judge that according to this curve the Cast Strip is at the bending radius r at kink guider 12 places
aBending radius r with kink minimum point place
bWhether greater than minimum bending radius r
MinIf, r
a＞r
MinAnd r
b＞r
MinIn each is untenable, then make the two all satisfy r by the guiding curvature of regulating looper height or regulating kink guider 12
a＞r
MinAnd r
b＞r
Min, if r
a＞r
MinAnd r
b＞r
MinIn two all untenable, then preferentially regulate the looper height value.
If in the c casting cycle, looper height does not change, then, keep the bending radius of existing Cast Strip kink guider 12 and looper height to finish until casting.
D, be in free kink object height H
0The time, the Cast Strip is under the thickness condition 1.5 times of the Cast Strip minimum bending radius for this reason of the bending radius at kink guider 12 places and kink minimum point place, i.e. r
a=1.5r
MinAnd r
b=1.5r
Min
The bending radius r of above-mentioned Cast Strip kink guider 12
bRefer to that this device goes up the tangent arc curve radius of Cast Strip guide-contour that all roller-ways form and rollgang level height, radius r as shown in Figure 4
a, when Cast Strip kink guider 12 lifts, the bending radius when all the formed Cast Strip of roller upper surface transport path height are consistent with subsequent delivery roller-way height is infinitely great.
Described Cast Strip thickness forms the temperature of kink between 1400～1200 ℃ between 1.5～3mm.And described free kink is formed between chill roll nip point and Cast Strip and the kink guider contact point, and looper height H (as Fig. 2) can regulate between 500～2500mm, and looper height H has determined the position of described kink minimum point.
Referring to Fig. 2～Fig. 7, the free kink control device of thin strap continuous casting of the present invention comprises swing guide 5 and drives hydraulic cylinder 16 that it also comprises, looper height checkout gear 15 is arranged at 5 times outsides of swing guide; The driving hydraulic cylinder 16 of described swing guide 5 is provided with displacement transducer 17, and swing guide 5 has bigger crooked radian, and its end is flat segments, and is highly consistent with subsequent horizontal rollgang 8 when being raised up on it working position under the hydraulic cylinder effect; Looper height checkout gear 15 and displacement transducer 17 all electrically connect with a kink guide controller 18; Kink guider 12, be arranged at horizontal feed roller-way 8 before, it is formed for kink guide roller group and the corresponding hydraulic cylinder 127,127 ' that drives that it is a cover can change curvature, wherein the guide roller group is made up of guide roller, the location roller of some arranged parallel; Establish the sensor that can detect the kink contacting points position on the kink guide roller group; Described kink guide controller 18 and this sensor, drive above-mentioned hydraulic cylinder servo valve 19,20,21 and displacement transducer 17 electrically connect.
Further, described kink guide roller group comprises, some guide rollers 121,121 ', 121 " and can measure the location roller 122,122 ' of kink contact position; guide roller 121,121 ', 121 ", location roller 122,122 ' is arranged side by side, location roller 122 (with guide roller 121,121 ' and location roller 122 be example, down same) be arranged at intervals between two guide rollers 121,121 '; The guide roller support end is installed on the rocking arm 123,123 ', and can be around self axis rotation, and adjacent guide roller 121,121 ' is connected by rocking arm between two rollers, and location roller 122 rotating shaft two ends are connected in rocking arm 123 between this two roller, forms a cover guide roller unit; Adjacent guide roller unit can be swung by rocking arm around between roller mutually, thereby makes guide roller group outline have transformable guiding radian; Between respective roller on the rocking arm two rotating shaft ends of adjacent guide roller drive sprocket 124,124 ' be set connect, wherein a drive sprocket 124 connects a drive motors 125; Described location roller 122 shaft heads are established sensor or generating motor 126 (as 126a～126d); At least one cover drives hydraulic cylinder 127, is connected in above-mentioned with rocking arm between roller; Wherein be installed in the bearing block 128 near first guide roller of subsequent delivery roller-way, 121 rotating shaft two ends, bearing block is arranged at the base that is fixed on the casting machine basis.
As further preferred, rocking arm can connect a cover driving hydraulic cylinder respectively between each roller of the present invention, realizes that rocking arm can independently be swung control between each roller.
Establish displacement transducer 129 behind the hydraulic cylinder 127 of rocking arm between described driven roller, and electrically connect kink guide controller 18.
In the present embodiment, adopt simple relatively control model, the Cast Strip guider has only two operating positions---level or bending, and fixing bending curvature determines by the mutual position of the spacing restriction rocking arm of the block between adjacent rocking arm.This method is simple, and the operating position of hydraulic cylinder has only two places, and the control method ratio is easier to.For casting single Cast Strip thickness, the stable casting condition of looper height is practical.
According to the needs of kink control accuracy, can use 4 groups and 4 groups of following Cast Strip kink guide roller groups in the described Cast Strip kink guider 12.Adopt the scheme of 4 groups of Cast Strip kink guide roller groups in this case example 1, wherein power transmission shaft, location roller diameter are between 120～300mm.
Generating motor 126 is adopted in the detection of described detection Cast Strip and kink guider 12 contact positions, this generating motor 126 directly links to each other with location roller 122, when contacting with the location roller, the Cast Strip cause roll body to rotate, the motor that then generates electricity produces current signal explanation Cast Strip through this position, determine the Cast Strip approximate location at this point, at described kink guider 4 similarly generating motors are installed, can be real-time detect the position, Cast Strip.
Embodiment 2
Referring to Fig. 8, the free loop control method of thin strap continuous casting of the present invention comprises the steps:
Kink is set up in a, Cast Strip, swing guide 5 descends working position at the drive lower swing of hydraulic cylinder 16 to it, concrete operating position is detected by displacement transducer 17 and is fed back to kink guide controller 18, and the latter is by the Stroke Control of servo valve 19 enforcements to hydraulic cylinder.
B, simultaneously, kink checkout gear 15 is the monitoring looper height in real time, and detected value gone out to transport to kink guide controller 18, the last detected kink position data of generating motor 126a～126d exports kink guide controller 18 on the kink guide roller group 12, and the latter goes out Cast Strip guided bend radius r according to present Cast Strip looper height, tape thickness, the calculation of parameter such as position of Cast Strip on guider
aCast Strip bending radius r with the kink bottom
b, with these two values respectively with Cast Strip minimum bending radius r
MinCompare, if do not meet r
a=1.5r
MinAnd r
b=1.5r
Min, then according to following formula Δ r
a=r
a-1.5r
Min, Δ r
b=r
b-1.5r
MinCalculate radius departure Δ r
a, Δ r
bAnd above-mentioned departure is converted into position error signal is transferred to servo valve 20,21, the latter drives hydraulic cylinder 127,127 ' with certain speed action, displacement transducer 22 and the displacement transducer 23 of the position of hydraulic cylinder by being installed in its rear portion detects and feeds back to kink guide controller 18, when the kink curved radius that records all satisfies formula r
a=1.5r
MinAnd r
b=1.5r
MinAfter, hydraulic cylinder 127,127 ' stops action, keeps present looper height.
If looper height does not change in the c casting cycle, then, keep the bending radius of existing Cast Strip kink guider 12 to finish until casting.
Claims (6)
1. the free loop control method of thin strap continuous casting comprises the steps:
A) at the kink guider position sensor is set, can detects Cast Strip contacting points position on the kink guider in real time, this kink guider is provided with the guide roller of some arranged parallel, and formation can change the kink guide roller group of curvature;
B) at the casting initial stage, the Cast Strip delivery head that all guide roller upper surfaces form on the kink guider is consistent with subsequent delivery roller-way height, swing guide lifts, its terminal flat segments keeps highly consistent with the kink guider, guarantees that the Cast Strip is transported to the subsequent delivery roller-way by swing guide and kink guider smoothly;
C) after the Cast Strip enters subsequent handling, the swing guide bottom, the kink guider drops to its initial target location, meanwhile milling train to the device rate between the coiling machine less than main frame speed, form and reach the initial target height value H of setting until the free kink in Cast Strip
0, the looper height checkout gear detects the height of the free kink in Cast Strip; The efficient cover curves of calculation of parameter such as kink contacting points position data, looper height data and Cast Strip thickness that the kink guide controller records according to the kink guider, and according to the bending radius r of this curve judgement Cast Strip at kink guider place
aBending radius r with kink minimum point place
bWhether greater than minimum bending radius r
Min, as wherein each is false, then make the two all satisfy r by the guiding curvature of regulating looper height or adjusting kink guider
a＞r
MinAnd r
b＞r
Min, if wherein two all untenable, then preferentially regulate the looper height value;
D) if in the casting cycle, looper height does not change, and then, keeps the bending radius of existing kink guider and looper height to finish until casting.
2. the free loop control method of thin strap continuous casting as claimed in claim 1, it is characterized in that, after the Cast Strip forms free kink, the bending radius at kink guider place and kink minimum point place for this reason under the thickness condition 1.5 times of the Cast Strip minimum bending radius be minimum control target, i.e. r
a=1.5r
MinAnd r
b=1.5r
Min
3. the free kink control device of thin strap continuous casting comprises swing guide and drives hydraulic cylinder, it is characterized in that,
The driving oil cylinder of described swing guide is provided with displacement transducer, and swing guide has bigger crooked radian, and its end is flat segments, and is consistent with subsequent delivery roller-way height when being raised up on it working position under the hydraulic cylinder effect; Also comprise,
The looper height checkout gear is arranged at the outside under the swing guide;
The kink guide controller electrically connects with the looper height checkout gear;
The kink guider, be arranged at the horizontal feed roller-way before, it is formed for kink guide roller group and the corresponding hydraulic cylinder that drives that can change curvature, wherein the guide roller group is made up of guide roller, the location roller of some arranged parallel; Establish the sensor that can detect the kink contacting points position on the kink guide roller group; Described kink guide controller and this sensor, the servo valve that drives above-mentioned hydraulic cylinder and displacement transducer electrically connect.
4. the free kink control device of thin strap continuous casting as claimed in claim 3 is characterized in that, described kink guide roller group comprises,
Some guide rollers and the location roller that can measure the kink contact position, guide roller, location roller are arranged side by side, and the location roller is arranged at intervals between two guide rollers; The guide roller support end is installed on the rocking arm, and can be around self axis rotation, and adjacent guide roller is connected by rocking arm between two rollers, and location roller rotating shaft two ends are connected in rocking arm between this two roller, forms a cover guide roller unit; Adjacent guide roller unit can be swung by rocking arm around between roller mutually, thereby makes guide roller group outline have transformable guiding radian; Between respective roller on the rocking arm two rotating shaft ends of adjacent guide roller drive sprocket be set connect, wherein a drive sprocket connects a drive motors;
Described location roller shaft head is established sensor or generating motor;
At least one cover drives hydraulic cylinder, is connected in above-mentioned with rocking arm between roller;
Wherein be installed in the bearing block near first guide roller rotating shaft of subsequent delivery roller-way two ends, bearing block is arranged at the base that is fixed on the casting machine basis.
5. the free kink control device of thin strap continuous casting as claimed in claim 4 is characterized in that, rocking arm connects a cover driving hydraulic cylinder respectively between described each roller.
6. the free kink control device of thin strap continuous casting as claimed in claim 4 is characterized in that, establishes displacement transducer behind the hydraulic cylinder of rocking arm between described driven roller, and electrically connects the kink guide controller.
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