CN105149562A - Method and device for cleaning twin-roll thin-strip continuous casting roll surface - Google Patents
Method and device for cleaning twin-roll thin-strip continuous casting roll surface Download PDFInfo
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- CN105149562A CN105149562A CN201510642921.2A CN201510642921A CN105149562A CN 105149562 A CN105149562 A CN 105149562A CN 201510642921 A CN201510642921 A CN 201510642921A CN 105149562 A CN105149562 A CN 105149562A
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Abstract
The invention relates to a method and device for cleaning a twin-roll thin-strip continuous casting roll surface. The roll surface cleaning device comprises two brush rolls, two motors, two hydraulic cylinders and a controller, wherein the two brush rolls are respectively parallel to a crystallization roll and are cylindrical, and the periphery of each brush roll is transplanted with slender metal wires as bristle; bearing blocks are arranged at the two end parts of each brush roll, and a pressure sensor is arranged at the rear part of each bearing block; the two motor are respectively connected with the two brush rolls; the two hydraulic cylinders act on the bearing blocks through the pressure sensors and drive the brush rolls to be close to or leave the crystallization roll; the control loops of the two hydraulic cylinders are respectively provided with servo valves, and a displacement sensor is arranged on each hydraulic cylinder; the pressure sensors, the displacement sensors and the servo valves of the two hydraulic cylinders are electrically connected with the controller. The method comprises the following steps: the brush rolls are used for cleaning the roll surface, the product of the specific value of the rotation speed of the brush rolls and the crystallization roll multiplied by the transplanting density of the brush rolls is larger than 1, and the bristle bending amount e of the brush rolls maintains at the range of 0.5-2.5 percent. The cleaning effect on the crystallization roll of the roll surface cleaning device is improved, oxidation films on the roll surface of the crystallization roll are uniformly distributed, and the casting strip quality is increased.
Description
Technical field
The present invention relates to continuous casting process, particularly a kind of method and device clearing up twin-roll thin strip continuous casting roll surface.
Background technology
Twin-roll thin strip continuous casting technology is as a kind of short route metallurgical technology technology, its typical production process is: the molten steel direct pouring of melting to be rotated in opposite directions by two at one and had in space that the crystallization roll of refrigerating function and side seal board surround and forms molten bath, molten steel is cooled also at crystal roller surface and then solidifies, finally form Thin Strip Steel at crystallization roll minimum gap place, Thin Strip Steel batches after hot rolling and cooling, directly manufactures hot-rolled finished product volume.
Molten steel has a lot of metal or nonmetal evaporation and forms oxide and is deposited on metallic matrix in process of setting, and forms one deck sull on its surface, because the fusing point of these oxides is lower than the fusing point of steel, can improve the heat conduction intensity of molten steel.But, if the uneven meeting of the cumulative thickness of oxide-film causes the setting rate of molten steel different, and then cause strip surface to crack or the defect such as shrinkage cavity, so, need to adopt a kind of apparatus and method to remove the unnecessary oxide of crystal roller surface, the oxide thickness uniformity on crystallization control roller surface effectively, improves surface quality of casting belt.
For this reason, most of thin strap continuous casting research institution have employed roll hairbrush (hereinafter referred to as brush roll) as main cleaning tool and means, and adopt certain pressure to make brush roll be adjacent to crystallization roll roll surface, and the speed difference both utilizing makes bristle and the phase mutual friction of crystallization roll roll surface thus removes roll surface oxide deposition.
During clean crystallization roll roll surface, the bristle that brush roll needs certain pressure to make to contact with crystallization roll produces bending, good cleaning effect could be produced, but the prolongation produced along with the activity duration, the bristle wear of brush roll shortens, and roller footpath diminishes, now the bristle density in planting of brush roll cylindrical is higher than value during initial input, now need the operation parameter changing some brush roll, as pressure, rotating speed etc., the guarantee cleaning effect of forward and backward brush roll to crystallization roll that wear and tear is consistent.
Summary of the invention
The object of the present invention is to provide a kind of method and the device of clearing up twin-roll thin strip continuous casting roll surface, in twin-roll thin strip continuous casting casting cycle, improve the effect of roll surface cleaning device cleaning crystallization roll, ensure that crystallization roll roll surface oxide-film is uniformly distributed, improve casting strip quality.The present invention is applicable to use double-roll type strip caster, the metal Cast Strip of cast thickness 0.5-5mm.
For achieving the above object, technical scheme of the present invention is:
A kind of thin band continuous casting crystallization roller roll surface cleaning device, corresponding crystallization roll is arranged respectively; It comprises, two brush roll, and parallel crystallization roll is arranged respectively, and is located at the setting up and down of the non-pool side of every root crystallization roll; Brush roll is cylindric, and its periphery is implanted with elongated metal wire as bristle; Brush roll both ends are provided with bearing block; Bearing block rear portion is respectively arranged with pressure sensor; Two motors, connect described two brush roll respectively; Two hydraulic cylinders, act on bearing block by pressure sensor, drive brush roll be adjacent to or leave crystallization roll; Two hydraulic cylinder control loops arrange servo valve respectively; Described hydraulic cylinder arranges displacement transducer; One controller, described pressure sensor, displacement transducer and two hydraulic cylinder servo valves are electrically connected described controller; The bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, the bristle sectional area percentage on bristle density in planting and brush roll cylindrical in unit are.
The method for cleaning of thin band continuous casting crystallization roller roll surface of the present invention, is characterized in that, two brush roll of roll surface cleaning device, respectively under hydraulic cylinder and driven by motor, are rotated and close to crystallization roll, and hold out against at crystallization roll roll surface with certain pressure; Along with prune job continue carry out, controller infers the change of its density in planting according to the cylindrical change of brush roll, correspondingly, the advance of hydraulic cylinder drive brush roll is ordered about by controlling servo valve, hydraulic cylinder displacement is predicted by displacement transducer, remains on 0.5% ~ 2.5% to keep the bristles bend amount e of brush roll; The setting formula of this amount of bow e is as follows:
Wherein: e: bristles bend amount, %;
R
0: brush roll initial diameter, mm;
R
1: brush roll working diameter, mm.
Further, brush roll is rotated in cleaning roll surface process, and itself and crystallization roll relatively rotate velocity ratio and be multiplied by the long-pending of brush roll density in planting and be greater than 1, that is:
Wherein: V
1: brush roll linear velocity, m/min;
V2: crystallization roll linear velocity, m/min;
λ: brush roll density in planting, %.
Further, in brush roll serious wear, the density in planting of its cylindrical more than 35% after, by by its cylindrical pattern, be processed into after helicon shape wave or spiral saw profile of tooth reduce its surperficial density in planting and continue to use.
Again, the control system of roll surface cleaning device calculates the situation of change of its density in planting according to brush roll wear extent, correspondingly change the velocity of rotation of brush roll; Wherein, the bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, and bristle density in planting i.e. all bristle sectional area proportions in 1 square decimeter.Brush roll exradius and density in planting follow following formula:
Wherein: d
0: be brush roll original outer diameter, mm.
D
n: be the external diameter after brush roll wearing and tearing, mm.
ρ
0: brush roll diameter is d
0time density in planting, %.
ρ
n: brush roll diameter is d
ntime density in planting, %.
The molten steel of melting rotates in opposite directions at two and has the formation molten bath, space that the crystallization roll of refrigerating function and side seal board surround, molten steel is cooled also at crystal roller surface and then solidifies, and finally forms Thin Strip Steel at crystallization roll minimum gap place and batches after hot rolling and cooling.
In casting cycle, the one group of roll surface cleaning device being arranged in the non-pool side of every root crystallization roll is cleared up roll surface.Often organize cleaning plant and comprise the execution testing agencies such as two brush roll parallel with crystallization roll and rotation, pressure measxurement, Bit andits control.Method for cleaning comprises: brush roll rigidity test flow process, and the pressure acted on crystallization roll by measuring brush roll obtains bristles bend value.Acted on the pressure on crystallization roll by control brush roll, control the amount of bow of bristle, and the flattening amount of the relative crystallization roll of brush roll; The density in planting of brush roll controls between 12-30%; The ratio of brush roll and crystallization roll velocity of rotation and the product of brush roll density in planting are greater than 1.Roll surface cleaning device can calculate the situation of change of its density in planting according to brush roll wear extent, thus changes the velocity of rotation of brush roll, maintains above-mentioned condition.In brush roll serious wear, the density in planting of its cylindrical more than 35% after, its surperficial density in planting can be reduced by being become by its Excircle machining helicon shape wave or spiral saw profile of tooth, continuing to use.
In thin strap continuous casting casting cycle, the one group of roll surface cleaning device being arranged in the non-pool side of every root crystallization roll is cleared up roll surface.Often organize cleaning plant and comprise the mechanisms such as two brush roll parallel with crystallization roll and rotation, pressure measxurement, Bit andits control.Method for cleaning comprises: the brush roll of rotation can be pressed on crystallization roll roll surface with certain pressure by the straight line executing mechanism at each brush roll two ends, cleaning roll surface.Along with bristle wear, brush roll diameter changes, then acted on the pressure on crystallization roll by change brush roll, keep bristles bend value to keep constant within the specific limits.
Roll surface cleaning device can regulate separately every root brush roll two ends to be applied to pressure on crystallization roll roll surface, also can change separately velocity of rotation and the rotation direction of every root brush roll.
The pressure that brush roll is applied on crystallization roll roll surface is measured by the pressure sensor be arranged between hydraulic cylinder and bearing block, and the pressure sum at every root brush roll two ends is the pressure that this brush roll is applied to crystallization roll roll surface.
Along with brush roll bristle wear, brush roll diameter changes, the pressure size that roll surface cleaning device can act on crystallization roll by controlling brush roll changes, and keeps bristles bend amount e to keep constant within the specific limits, and amount of bow scope is 0.5%-2.5%.
The brush roll of described roll surface cleaning device and the ratio of crystallization roll velocity of rotation are multiplied by the long-pending of brush roll density in planting and are greater than 1.The control system of roll surface cleaning device can calculate the situation of change of its density in planting according to brush roll wear extent, correspondingly change the velocity of rotation of brush roll.
In brush roll serious wear, the density in planting of its cylindrical more than 30% after, its surperficial density in planting can be reduced by being become by its Excircle machining helicon shape wave or spiral saw profile of tooth, reaching within the scope of 12-30%, can reuse.
Major advantage of the present invention:
1, in casting cycle, the pressure on crystallization roll roll surface can be acted on according to the abrasion condition adjustment roll surface cleaning device of brush roll, ensure before and after cleaning effect unanimously all at a casting heat.
2, pressure position controls to coordinate coupling, improves the Technological adaptability of equipment, can tackle various working condition, improves the service life of brush roll.
The difference of the present invention and prior art and improvements:
In scheme described in WO2009003223, by Real-Time Monitoring crystal roller surface cleannes, change roll surface cleaning device brush roll relative to the pressure of crystallization roll, velocity of rotation and drive motor moment of torsion even load, reach the object changing crystal roller surface cleannes.Wherein, upper and lower brush roll is arranged symmetrically in the outside of crystallization roll, and it is relative to the pressure between crystallization roll and be displaced through the stroke realization changing hydraulic cylinder, and the rotating speed of brush roll and moment of torsion are then regulated by brush roll drive motor.Wherein, upper and lower brush roll has different purposes and usage, and upper brush roll uses when normal casting, and lower brush roll is placed on the below of brush roll, and diameter is less than brush roll, and only starts and terminate to use for the previous period in casting.Compared with this patent, in the present invention, upper and lower brush roll two ends are equipped with pressure detecting and position control, and control accuracy is higher.And according to the brush roll diameter change adjustment detected in real time, it acts on the pressure on crystallization roll roll surface to the roll surface cleaning device in the present invention, reacts sensitiveer.And take into account the density in planting change of monitoring brush roll, equipment situation can be understood in time, better can play the effect of brush roll.
Described in Korean Patent KR20140000796, the brush roll be axially arranged in parallel along crystallization roll is divided into three parts, and be respectively two ends and middle part, wherein each tip lengths accounts for the 1/14-1/12 of whole roller length, and bristle diameter is 0.08-0.12mm; The bristle diameter of remainder is 0.15-0.175mm.This patent claims can effectively clear up crystallization roll roll surface in this way, improves the quality of Cast Strip edge, avoids edge to occur wrinkle.The method can have certain effect really, but, manufacture difficulty.And the present invention is based on the density in planting change after brush roll wearing and tearing affect cleaning effect and set out, formulated corresponding control method, more can effectively utilize brush roll and carry out roll surface prune job.
Accompanying drawing explanation
Fig. 1 is the side schematic view of roll surface cleaning device of the present invention.
Fig. 2 is the schematic top plan view of roll surface cleaning device of the present invention.
Fig. 3 is the typical control principle drawing of roll surface cleaning device of the present invention.
Fig. 4 is brush roll renovate method schematic diagram of the present invention.
Fig. 5 is the A-A sectional view of Fig. 4.
Detailed description of the invention
See Fig. 1 ~ Fig. 5, thin band continuous casting crystallization roller roll surface cleaning device of the present invention, corresponding crystallization roll 1a, 1b arrange respectively, for two brush roll 5 ', 6 ', 4a of crystallization roll 1a side, 4b for side seal board.
Two brush roll 5 ', 6 ', parallel crystallization roll 1a arranges respectively, and is located at the setting up and down of the non-pool side of every root crystallization roll 1a; Brush roll 5 ', 6 ' is in cylindric, and its periphery is implanted with elongated metal wire as bristle; Brush roll 5 ', 6 ' both ends are provided with bearing block 16,16 ', 17,17 '; Bearing block rear portion is respectively arranged with pressure sensor 10,10 ', 15,15 '; Two motors 14,14 ', connect described two brush roll 5 ', 6 ' respectively; Two hydraulic cylinders 11,11 ', act on 16,16 ' bearing block by pressure sensor 10,10 ', drive brush roll 5 ' to be adjacent to or to leave crystallization roll 1a;
The method for cleaning of thin band continuous casting crystallization roller roll surface of the present invention, two brush roll of roll surface cleaning device, respectively under hydraulic cylinder and driven by motor, are rotated and close to crystallization roll, and hold out against at crystallization roll roll surface with certain pressure; Along with prune job continue carry out, controller infers the change of its density in planting according to the cylindrical change of brush roll, correspondingly, the advance of hydraulic cylinder drive brush roll is ordered about by controlling servo valve, hydraulic cylinder displacement is predicted by displacement transducer, remains on 0.5% ~ 2.5% to keep the bristles bend amount e of brush roll; The setting formula of this amount of bow e is as follows:
Wherein: e: bristles bend amount, %;
R
0: brush roll initial diameter, mm;
R
1: brush roll working diameter, mm.
Further, in brush roll rotation process, the ratio of itself and crystallization roll velocity of rotation is multiplied by the long-pending of brush roll density in planting and is greater than 1, that is:
Wherein: V
1: brush roll linear velocity, m/min;
V2: crystallization roll linear velocity, m/min;
λ: brush roll density in planting, %.
Further, in brush roll serious wear, the density in planting of its cylindrical more than 35% after, by by its cylindrical pattern, be processed into after helicon shape wave or spiral saw profile of tooth reduce its surperficial density in planting and continue to use.
Again, the control system of roll surface cleaning device calculates the situation of change of its density in planting according to brush roll wear extent, correspondingly change the velocity of rotation of brush roll; Wherein, the bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, and bristle density in planting i.e. all bristle sectional area proportions in 1 square decimeter.Brush roll exradius and density in planting follow following formula:
Wherein: d
0: be brush roll original outer diameter, mm;
D
n: be the external diameter after brush roll wearing and tearing, mm;
ρ
0: brush roll diameter is d
0time density in planting, %;
ρ
n: brush roll diameter is d
ntime density in planting, %.
Embodiment
The control strategy that example introduces roll surface method for cleaning is arranged as below with the side of two of crystallization roll 1a brush roll.
Hydraulic cylinder 11,13 control loop arranges servo valve 61,62 respectively; Hydraulic cylinder 11,13 is arranged respectively displacement transducer 12,18 and pressure sensor 10,15, be all electrically connected controller 60.The bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, and bristle density in planting i.e. all bristle sectional area proportions in 1 square decimeter.
As shown in Figure 3, in casting operation, crystallization roll 1a, 1b rotate in opposite directions, and two brush roll 5 ', 6 ' of roll surface cleaning device, respectively under hydraulic cylinder and driven by motor, are rotated and close to crystallization roll 1a, and to hold out against thereon with certain pressure.Along with prune job continue carry out, roll surface cleaning device controller 60 infers the change of its density in planting according to the cylindrical change of brush roll 5 ', 6 ', correspondingly, order about hydraulic cylinder 11 drive brush roll 5 ' to reduce distance between crystallization roll 1a by controlling servo valve 61, hydraulic cylinder displacement is predicted by displacement transducer 12, pressure is predicted by pressure sensor 10, the two variable quantity, by the existing model specification in controller 60, remains on as formula 1 to keep the bristles bend amount of brush roll 5 ') as described in scope in.In like manner, servo valve 62 also can receive the drive singal of self-controller 60, drives hydraulic cylinder 13 to drive brush roll 6 ' to carry out similar operation.
Further, in brush roll 5 ', 6 ' rotation process, the ratio of itself and crystallization roll velocity of rotation is multiplied by the long-pending of brush roll density in planting and is greater than 1, namely meets described formula 2).
See Fig. 4, Fig. 5, in brush roll 5 ' serious wear, the density in planting of its cylindrical more than 35% after, its surperficial density in planting can be reduced by being become by its Excircle machining helicon shape wave or spiral saw profile of tooth, reaching within the scope of 12-30%.
Claims (5)
1. clear up a method for twin-roll thin strip continuous casting roll surface, it is characterized in that, two brush roll of roll surface cleaning device, respectively under hydraulic cylinder and driven by motor, are rotated and close to crystallization roll, and hold out against at crystallization roll roll surface with certain pressure; Along with prune job continue carry out, controller infers the change of its density in planting according to the cylindrical change of brush roll, correspondingly, the advance of hydraulic cylinder drive brush roll is ordered about by controlling servo valve, hydraulic cylinder displacement is predicted by displacement transducer, remains on 0.5% ~ 2.5% to keep the bristles bend amount e of brush roll; The setting formula of this amount of bow e is as follows:
Wherein: e: bristles bend amount, %;
R
0: brush roll initial diameter, mm;
R
1: brush roll working diameter, mm.
2. the method for cleaning twin-roll thin strip continuous casting roll surface as claimed in claim 1, is characterized in that, brush roll is in rotation cleaning roll surface process, and the ratio of itself and crystallization roll velocity of rotation is multiplied by the long-pending of brush roll density in planting and is greater than 1, that is:
Wherein: V
1: brush roll linear velocity, m/min;
V
2: crystallization roll linear velocity, m/min;
λ: brush roll density in planting, i.e. all bristle sectional area proportions in 1 square decimeter, %.
3. the method in cleaning thin band continuous casting crystallization roller face as claimed in claim 2, it is characterized in that, in brush roll serious wear, the density in planting of its cylindrical more than 35% after, by by its cylindrical pattern, be processed into after helicon shape wave or spiral saw profile of tooth reduce its surperficial density in planting and continue to use.
4. the method in cleaning thin band continuous casting crystallization roller face as claimed in claim 2, it is characterized in that, the control system of roll surface cleaning device calculates the situation of change of its density in planting according to brush roll wear extent, correspondingly change the velocity of rotation of brush roll; Wherein, the bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, and bristle density in planting i.e. all bristle sectional area proportions in 1 square decimeter.Exradius and density in planting follow following formula:
Wherein: d
0: be brush roll original outer diameter, mm;
D
n: be the external diameter after brush roll wearing and tearing, mm;
ρ
0: brush roll diameter is d
0time density in planting, %;
ρ
n: brush roll diameter is d
ntime density in planting, %.
5. the cleaning plant of the method for cleaning twin-roll thin strip continuous casting roll surface as claimed in claim 1, corresponding crystallization roll is arranged respectively; It is characterized in that, comprise,
Two brush roll, parallel crystallization roll is arranged respectively, and is located at the setting up and down of the non-pool side of every root crystallization roll; Brush roll is cylindric, and its periphery is implanted with elongated metal wire as bristle; Brush roll both ends are provided with bearing block; Bearing block rear portion is respectively arranged with pressure sensor;
Two motors, connect described two brush roll respectively;
Two hydraulic cylinders, act on bearing block by pressure sensor, drive brush roll be adjacent to or leave crystallization roll; Two hydraulic cylinder control loops arrange servo valve respectively; Described hydraulic cylinder arranges displacement transducer;
One controller, described pressure sensor, displacement transducer and two hydraulic cylinder servo valves are electrically connected described controller;
The bristle density in planting of brush roll cylindrical is arranged between 12 ~ 30%, and bristle density in planting i.e. all bristle sectional area proportions in 1 square decimeter.
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|---|---|---|---|
| CN201510642921.2A CN105149562B (en) | 2015-09-30 | 2015-09-30 | A kind of method for clearing up twin-roll thin strip continuous casting roll surface |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018119551A1 (en) * | 2016-12-26 | 2018-07-05 | 宝山钢铁股份有限公司 | Casting roller surface cleaning device and method |
| CN109290536A (en) * | 2018-09-18 | 2019-02-01 | 洛阳中赫非晶科技有限公司 | A kind of amorphous band production system |
| CN111730035A (en) * | 2020-07-03 | 2020-10-02 | 贵溪奥泰铜业有限公司 | Brass bar processing continuous casting device |
| CN112157230A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Double-roller thin-strip continuous casting roller surface cleaning device |
| CN112157229A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Roll surface cleaning device for thin strip continuous casting and control method and control device thereof |
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| US20020088602A1 (en) * | 1998-06-17 | 2002-07-11 | Heiji Kato | Strip casting apparatus |
| CN101376164A (en) * | 2007-08-27 | 2009-03-04 | 宝山钢铁股份有限公司 | Control method of roll forming of twin-roll thin strip continuous casting cooling roll |
| CN102950276A (en) * | 2011-08-30 | 2013-03-06 | 宝山钢铁股份有限公司 | Method and device for cleaning surface of dual-roller thin-strip casting roll |
| CN103182491A (en) * | 2011-12-30 | 2013-07-03 | 宝山钢铁股份有限公司 | Control method and device for thin-strip continuous casting free loop |
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2015
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| US20020088602A1 (en) * | 1998-06-17 | 2002-07-11 | Heiji Kato | Strip casting apparatus |
| CN101376164A (en) * | 2007-08-27 | 2009-03-04 | 宝山钢铁股份有限公司 | Control method of roll forming of twin-roll thin strip continuous casting cooling roll |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018119551A1 (en) * | 2016-12-26 | 2018-07-05 | 宝山钢铁股份有限公司 | Casting roller surface cleaning device and method |
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| CN111730035A (en) * | 2020-07-03 | 2020-10-02 | 贵溪奥泰铜业有限公司 | Brass bar processing continuous casting device |
| CN112157230A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Double-roller thin-strip continuous casting roller surface cleaning device |
| CN112157229A (en) * | 2020-09-07 | 2021-01-01 | 东北大学 | Roll surface cleaning device for thin strip continuous casting and control method and control device thereof |
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