A method for increasing the casting time of thin strip continuous casting and its side sealing device

Abstract

A method for improving the casting time of thin strip continuous casting and a side sealing device thereof, comprising: 1) side sealing plates which can move upward or downward in one direction or in two directions are arranged on the end faces of both sides of a crystallization roller; when the side sealing plates move upward, the length of the side sealing plates is greater than twice the distance between the upper and lower intersection points where the upper and lower sides of the side sealing plates contact the arc surface of the crystallization roller; when the side sealing plates move downward, the length of the side sealing plates is greater than twice the distance between the upper intersection point formed by the contact between one side edge of the side sealing plate and the upper part of the arc surface of the crystallization roller and the lower intersection point formed by the contact between the extension line of the side edge and the lower part of the arc surface of the crystallization roller; 2) the side sealing plates which are closely attached to the end faces of the crystallization roller as the crystallization roller rotates contact and rub against the end faces of the crystallization roller to form a groove on the inner side face thereof, when the displacement amount L of the side sealing plates is greater than or equal to (1 / 10 to 1 / 2) d, d is the thickness of the side sealing plates, in mm, and L is in mm; the side sealing plates are moved outward along the axis of the crystallization roller to make the end faces of the crystallization roller separate from the groove on the surface of the side sealing plates; and then the side sealing plates are moved upward or downward until the groove on the side sealing plates completely separates from the end faces of the crystallization roller.

Description

Technical Field

[0001] The invention relates to a thin strip continuous casting technology, and in particular to a method for improving the casting time of thin strip continuous casting and a side sealing device thereof. Background Art

[0002] Thin strip continuous casting technology is a new type of thin strip steel production process. Molten steel is cast into a molten pool surrounded by twin rollers and side sealing plates through transition devices such as nozzle distributors. After twin roller casting and rolling, 2-10mm strip steel is directly produced. Compared with the traditional continuous casting process, a series of conventional processes such as rough rolling, hot rolling and related heating and head cutting are eliminated. It has the advantages of low equipment investment, simple production process, low energy consumption and low product cost. It is a revolutionary short process in the field of steel strip industrial production in the 21st century.

[0003] The flow distribution system, crystallization rollers, and side sealing plates are the three core components of the thin strip continuous casting process, and have become one of the key factors restricting the continuous production of the process. Among them, the side sealing technology is the most critical link in the thin strip continuous casting technology, and is the key factor affecting the quality of the cast strip and the process stability during the thin strip continuous casting process. The side sealing plays a role in restraining the metal liquid, promoting the forming of the thin strip, and ensuring the edge quality of the thin strip. At present, the side sealing technology mainly includes three side sealing methods: electromagnetic side sealing, gas side sealing, and solid side sealing. Among them, gas side sealing is still in the theoretical research stage. Electromagnetic side sealing technology is also far from meeting the requirements of industrial production. Solid side sealing is currently the most mature and best industrially applied side sealing method.

[0004] Specifically, the side sealing plates in the current thin strip continuous casting process are triangular in style, with the middle part in contact with the molten steel and eroded by the molten steel, and the edges in contact with the end faces of the casting rollers and worn by the casting rollers, with the wear rate usually greater than the erosion rate. Therefore, after a certain casting time, deeper grooves are formed at the contact position between the side sealing plates and the end faces of the crystallization rollers, while the end faces in contact with the molten steel are less corroded. During the casting process, when the number of continuous casting furnaces reaches an average of 4 to 6 furnaces, the grooves on both sides of the side sealing plates gradually deepen, which requires frequent replacement of the side sealing plates during the production process. And each time the side sealing plates are replaced, on the one hand, the unit needs to stop and re-prepare for installation and other processes, which is time-consuming and labor-intensive; on the other hand, since various casting nozzles, flow distributors and other consumable parts need to be replaced each time they are restarted, this also greatly increases the cost per ton of steel for the production line.

[0005] At present, the research and development of solid side sealing plates at home and abroad mainly focuses on the refractory material itself, such as:

[0006] U.S. Patent US7208433 "Ceramic plates for side dams of twin-drum continuous strip casters" proposes using a ceramic side sealing plate made of a rare earth garnet, sialon and BN (boron nitride) composite material. The patent reports that the side sealing plate has a low thermal conductivity (thermal conductivity ≤ 10 W / m·K) and good thermal shock resistance.

[0007] U.S. Patent US4885264 "Pressure-sintered polycpystalline mixed materials with a base of hexagonal boron nitride, oxides and carbides" studied the preparation of ceramic side sealing plates using boron nitride-oxide based composite materials and boron nitride-non-oxide composite materials. In the experiment, SiC and ZrC were added to the BN-ZrO2 matrix respectively, and the ceramic composite materials were prepared by hot pressing and sintering at 1500-1800°C under vacuum conditions.

[0008] Chinese patent CN101648260A "Double-roller thin strip continuous casting side sealing plate and its manufacturing method" uses a panel made of boron nitride material and a substrate made of aluminum silicon thermal insulation material to make a composite side sealing plate. The patent reports that the composite side sealing plate has good thermal insulation performance.

[0009] Chinese patent 201410161789.9 discloses "Ceramic side sealing plate for twin-roll thin strip continuous casting and its preparation method", the chemical composition of the ceramic side sealing plate is calculated by mass percentage: 40-75% hexagonal boron nitride powder, 10-45% Si3N4 powder, 10-30% zirconium mullite powder, 3-15% TiN powder and 0.5-10% additives, wherein the additive is one or a combination of Y2O3, industrial Al2O3, MgO and light magnesium carbonate. The present invention develops a new formula composition of a new side sealing plate and adjusts its preparation method so that the side sealing plate has the properties of high temperature resistance, high strength, thermal shock resistance and low thermal conductivity.

[0010] Chinese patent 201610948816.6 discloses "a supporting device and method for a side sealing plate of a twin-roll thin strip continuous casting", and the method described is: in the thin strip continuous casting operation, the side sealing plate and its supporting device are pressed against the end face of the casting roller with a certain pressure under the action of the push rod of the tightening mechanism, and at different casting operation points, by controlling the opening and closing of the one-way valve, the side sealing plate tightening mechanism has different tightening states, thereby improving the support stability of the side sealing plate.

[0011] Chinese patent 201611051974.8 discloses "a side sealing plate for thin strip continuous casting and its use method", which designs a side sealing plate for double-roll thin strip continuous casting, including a side sealing plate body and a lubricating device. The side sealing plate is composed of a grooved shell, a heat insulation plate, a base plate, a ceramic plate and a wear-resistant plate bonded together. The lubricating device is composed of a lubricant material and a conveying pipe: the conveying pipe is filled with a lubricant material. It is said that the side sealing plate has good thermal insulation performance, and the contact part with the crystallization roller has good thermal shock resistance and wear resistance, and the contact part with the molten steel has strong corrosion resistance.

[0012] The above patents all propose different methods in terms of the material and installation of the side sealing plates, but their lifespan is still determined by the thickness of the wear of a single side sealing plate, and a longer casting time cannot be achieved, and the existing problems are not solved. Summary of the invention

[0013] The purpose of the present invention is to propose a method for improving the casting time of thin strip continuous casting and a side sealing device thereof, by improving the shape and installation method of the side sealing plate so that it can be displaced in one direction or two directions, and the return of the overall side sealing device can be achieved within a certain period of time, so as to continuously avoid the grooves formed by the wear of the end face of the crystallization roller, form the dislocation wear of the side sealing plate, thereby increasing the utilization rate of the side sealing plate and improving the casting time of thin strip continuous casting.

[0014] To achieve the above object, the technical solution of the present invention is:

[0015] A method for increasing the casting time of thin strip continuous casting, comprising:

[0016] 1) Side sealing plates that can move upward or downward in one direction or in two directions are arranged on both sides of the crystallization roller;

[0017] When the side sealing plate moves upward, the length of the side sealing plate is greater than twice the distance between the upper and lower intersection points where the upper and lower sides of the side sealing plate contact the arc surface of the crystallization roller;

[0018] When the side sealing plate moves downward, the length of the side sealing plate is greater than twice the distance between the upper intersection point formed by the contact between one side edge of the side sealing plate and the upper part of the arc surface of the crystallization roller and the lower intersection point formed by the contact between the extension line of the side edge and the lower part of the arc surface of the crystallization roller;

[0019] 2) As the crystallization roller rotates, the side sealing plate close to the end face of the crystallization roller contacts and rubs against the end face of the crystallization roller to form a groove on the surface of the side sealing plate. When the end face of the crystallization roller is embedded into the surface of the side sealing plate to a depth that is, the displacement of the side sealing plate is L≥(1 / 10~1 / 2)d, where d is the thickness of the side sealing plate, in mm, and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to separate the end face of the crystallization roller from the groove on the surface of the side sealing plate; then move the side sealing plate upward or downward until the groove on the side sealing plate is completely out of the range of the end face of the crystallization roller.

[0020] Preferably, the side sealing plate is moved downward. After the side sealing plate is installed on the end faces of the two crystallization rollers, the lower part of the side sealing plate contacts the end faces of the crystallization rollers. The end point on one side of the top face of the side sealing plate is point A, and the same side of its bottom face intersects with the lower end of the arc line of the crystallization roller to form a lower intersection point as point C. The same side of the side sealing plate and the upper intersection point of the arc line of the crystallization roller are point B, and the intersection point of the top face of the molten pool and one side of the crystallization roller is point D. The point where the two crystallization rollers are closest to each other is the kiss point, and point C is at least 10 mm lower than the kiss point.

[0021] When the side displacement detects that the side sealing plate has shifted L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate in mm and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate downward until point B is removed at least 10mm outside the range of the crystallization roller. At this time, the upper and lower intersection points of the side sealing plate and the arc line of the crystallization roller are point B2 and point B1 respectively. Point B1 is at least 10mm higher than point D, and point A is at least 30mm higher than point B2.

[0022] Preferably, the side sealing plate moves downward at a speed of 0.1 to 20 mm / s.

[0023] Preferably, when the side sealing plate is moved upward, after the side sealing plate is installed on the end faces of the two crystallization rollers, its upper part contacts the end faces of the crystallization rollers, and one end point of the top face of the side sealing plate is point A.

[0024] The upper intersection point of the same side with the crystallization roller arc is point B, the lower intersection point with the crystallization roller arc is point B1, the intersection point of the top surface of the molten pool and the crystallization roller on one side is point D, and the point closest to the two crystallization rollers is the kiss point. Point B is at least 10mm higher than point D, and point A is at least 30mm higher than point B.

[0025] When the side displacement detects that the side sealing plate has shifted L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate, in mm, and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate upward until point B1 is removed at least 10mm outside the range of the crystallization roller. At this time, the points where the side sealing plate intersects the crystallization roller are points B2 and C respectively. Point B2 is at least 10mm higher than point D, and point C is at least 10mm lower than the kiss point.

[0026] Preferably, the side sealing plate moves upward at a speed of 0.1 to 20 mm / s.

[0027] The side sealing device of the method for increasing the casting time of thin strip continuous casting described in the present invention comprises:

[0028] Two side sealing plates are respectively arranged on the side end surfaces of the two crystallization rollers;

[0029] A plurality of support rollers and shafts are arranged on the back of the side sealing plate, and the support rollers are against the side sealing plate;

[0030] Two guide rails are respectively arranged on both sides of the side sealing plate. The guide rail is a U-shaped structure, in which a plurality of rollers and corresponding axles are arranged along the length direction. Corresponding to the axles, guide grooves for the axles to move left and right are arranged on both sides of the U-shaped structure of the guide rail;

[0031] A plurality of reset pins are arranged on the guide rails at intervals along the length direction of the two guide rails.

[0032] A plurality of electromagnetic relays are arranged on the outer side of the guide rail through a bracket and correspond to the return pins one by one respectively;

[0033] A plurality of reset drive devices respectively correspond to the outer ends of the wheel shafts of the rollers.

[0034] Preferably, the reset pin is U-shaped, one side end of which is located on one side of the guide rail on the back side of the side sealing plate, and the electromagnetic relay corresponds to the side end.

[0035] Preferably, the reset drive device comprises a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

[0036] Preferably, the lower portion of the side sealing plate is trapezoidal.

[0037] The present invention improves the shape, installation method and use method of the side sealing plate so that it can move unidirectionally or bidirectionally at the side sealing position, so that the end face of the crystallization roller avoids the groove formed by the contact between the side sealing plate and the end face of the crystallization roller, and avoids the side sealing plate from forming an excessively large dent at a single position, which requires stopping the continuous casting operation for replacement.

[0038] Beneficial effects of the present invention:

[0039] 1. The present invention can increase the wear area of ​​the side sealing plate by moving the side sealing plate and the side sealing device up and down, thereby greatly increasing the continuous casting time of the thin strip continuous casting.

[0040] 2. The method and side sealing device of the present invention also save the time and cost of replacing the flow distributor and the distributor during the casting process during continuous use.

[0041] 3. The side sealing device of the present invention is simple, reliable and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of an embodiment of the method for increasing the casting time of thin strip continuous casting according to the present invention Figure 1 ;

[0043] Figure 2 Schematic diagram of an embodiment of the method for increasing the casting time of thin strip continuous casting according to the present invention Figure 2 ;

[0044] Figure 3 Schematic diagram of an embodiment of the method for increasing the casting time of thin strip continuous casting according to the present invention Figure 3 ;

[0045] Figure 4 Schematic diagram of an embodiment of the method for increasing the casting time of thin strip continuous casting according to the present invention Figure 4 ;

[0046] Figure 5 The side sealing device of the present invention is used in a three-dimensional manner. Figure 1 ;

[0047] Figure 6 The side sealing device of the present invention is used in a three-dimensional manner. Figure 2 ;

[0048] Figure 7 It is a front view of an embodiment of the side sealing device of the present invention;

[0049] Figure 8 A three-dimensional side sealing device according to an embodiment of the present invention Figure 1 ;

[0050] Fig. 9 A three-dimensional side sealing device according to an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0051] See also Figure 1 to Figure 4 The method for increasing the casting time of thin strip continuous casting of the present invention comprises:

[0052] 1) Side sealing plates 1 are provided on both side end surfaces of the crystallization roller 100 and can move upward or downward in one direction or in two directions;

[0053] When the side sealing plate 1 moves upward, the length of the side sealing plate 1 is greater than twice the distance between the upper and lower intersections of the side sealing plate 1 and the arc surface of the crystallization roller 100;

[0054] When the side sealing plate 1 moves downward, the length of the side sealing plate 1 is greater than twice the distance between the upper intersection formed by the contact between one side edge of the side sealing plate 1 and the upper part of the arc surface of the crystallization roller 100 and the lower intersection formed by the contact between the extension line of the side edge and the lower part of the arc surface of the crystallization roller 100;

[0055] 2) As the crystallization roller rotates, the side sealing plate close to the end face of the crystallization roller contacts and rubs against the end face of the crystallization roller to form a groove on the surface of the side sealing plate. When the end face of the crystallization roller is embedded into the surface of the side sealing plate to a depth that is, the displacement of the side sealing plate is L≥(1 / 10~1 / 2)d, where d is the thickness of the side sealing plate, in mm, and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to separate the end face of the crystallization roller from the groove on the surface of the side sealing plate; then move the side sealing plate upward or downward until the groove on the side sealing plate is completely out of the range of the end face of the crystallization roller.

[0056] Preferably, the side sealing plate is moved downward. After the side sealing plate is installed on the end faces of the two crystallization rollers, the lower part of the side sealing plate contacts the end faces of the crystallization rollers. The end point on one side of the top face of the side sealing plate is point A, and the same side of its bottom face intersects with the lower end of the arc line of the crystallization roller to form a lower intersection point as point C. The same side of the side sealing plate and the upper intersection point of the arc line of the crystallization roller are point B, and the intersection point of the top face of the molten pool and one side of the crystallization roller is point D. The point where the two crystallization rollers are closest to each other is the kiss point, and point C is at least 10 mm lower than the kiss point.

[0057] When the displacement is detected that the side sealing plate is displaced L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate in mm and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate downward until point B is removed at least 10mm outside the range of the crystallization roller. At this time, the upper and lower intersection points of the side sealing plate and the arc line of the crystallization roller are point B2 and point B1 respectively. Point B1 is at least 10mm higher than point D, and point A is at least 30mm higher than point B2.

[0058] Preferably, the side sealing plate moves downward at a speed of 0.1 to 20 mm / s.

[0059] Preferably, when the side sealing plate is moved upward, after the side sealing plate is installed on the end faces of the two crystallization rollers, its upper part contacts the end faces of the crystallization rollers, and one end point of the top face of the side sealing plate is point A.

[0060] The upper intersection point of the same side with the crystallization roller arc is point B, the lower intersection point with the crystallization roller arc is point B1, the intersection point of the top surface of the molten pool and the crystallization roller on one side is point D, and the point closest to the two crystallization rollers is the kiss point. Point B is at least 10mm higher than point D, and point A is at least 30mm higher than point B.

[0061] When the displacement is detected that the side sealing plate is displaced L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate in mm and L in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate upward until point B1 is removed at least 10mm outside the range of the crystallization roller. At this time, the points where the side sealing plate intersects the crystallization roller are point B2 and point C respectively. Point B2 is at least 10mm higher than point D, and point C is at least 10mm lower than the kiss point.

[0062] Preferably, the side sealing plate moves upward at a speed of 0.1 to 20 mm / s.

[0063] See also Figures 5 to 9 The side sealing device for the method for increasing the casting time of thin strip continuous casting of the present invention comprises:

[0064] Two side sealing plates 1 are respectively arranged on the side end surfaces of the two crystallization rollers 100 and the molten pool 200;

[0065] A plurality of support rollers 2 and shafts are arranged on the back of the side sealing plate 1, and the support rollers 2 are against the side sealing plate 1;

[0066] Two guide rails 3 are respectively arranged on both sides of the side sealing plate 1. The guide rail 3 is a U-shaped structure, and a plurality of rollers 4 and corresponding axles 41 are arranged inside the guide rail 3 along the length direction. Corresponding to the axles 41, guide grooves 31 for the axles 41 to move left and right are arranged on both sides of the U-shaped structure of the guide rail 3.

[0067] A plurality of reset pins 5 are arranged on the guide rails 1 at intervals along the length direction of the two guide rails 1.

[0068] A plurality of electromagnetic relays 6 are arranged on the outer side of the guide rail 3 through a bracket, and correspond to the return pins 5 one by one respectively;

[0069] A plurality of reset drive devices (not shown) respectively correspond to the outer ends of the wheel axles of the rollers.

[0070] Preferably, the reset pin 5 is U-shaped, one side end of which is located on one side of the guide rail 3 on the back side of the side sealing plate 1, and the electromagnetic relay 6 corresponds to the side end.

[0071] Preferably, the reset drive device comprises a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

[0072] Preferably, the lower portion of the side sealing plate is trapezoidal.

[0073] Example

[0074] The main steps of using the method and the side sealing device of the present invention to continuously cast stainless steel in thin strips are as follows:

[0075] (1) Thin strip continuous casting uses side sealing plates (length 900 mm, thickness 30 mm, width 300 mm). After the crystallization rollers are positioned, the side sealing plates are inserted from the top of the guide rails, and the molten pool level is 180 mm.

[0076] (2) After the roller in the guide rail rotates, the side sealing plate is positioned so that the top of the side sealing plate is 30 mm higher than the molten pool level;

[0077] (3) When the side sealing plate is in place, it is pressed against the back of the side sealing plate as a whole by the support roller, the reset relay is powered off, and the reset pin is in a stress-free state;

[0078] (4) After the stainless steel is smelted and qualified, molten steel casting begins. The molten steel flows into the molten pool through the distributor and the distributor. In the early stage of casting, the roller in the guide rail remains stationary;

[0079] (5) In the middle stage of molten steel casting, as the crystallization roller rotates, a groove is gradually formed on the inner side of the side sealing plate in contact with the end face of the crystallization roller, that is, the side sealing plate is gradually embedded in the end face of the crystallization roller; the displacement of the side sealing plate embedded in the end face of the crystallization roller is detected. When the displacement is detected to be ≥6mm, the reset relay is energized, and the reset pin drives the side sealing plate back to the original position. Then, driven by the roller in the guide rail, the side sealing plate moves upward at a speed of 10mm / s until the groove on the side sealing plate is completely separated from the molten pool, and the reset relay is de-energized.

Claims

1. A method for increasing the casting time of thin strip continuous casting, characterized in that: include: 1) Side sealing plates that can move upward or downward in one direction or in two directions are arranged on both side end surfaces of the crystallization roller; when the side sealing plates move upward, the length of the side sealing plates is greater than twice the distance between the upper and lower intersection points where the side sealing plates contact the arc surface of the crystallization roller; When the side sealing plate moves downward, the length of the side sealing plate is greater than twice the distance between the upper intersection point formed by the contact between one side edge of the side sealing plate and the upper part of the arc surface of the crystallization roller and the lower intersection point formed by the contact between the extension line of the side edge and the lower part of the arc surface of the crystallization roller; 2) As the crystallization roller rotates, the side sealing plate close to the end face of the crystallization roller contacts and rubs against the end face of the crystallization roller to form a groove on the surface of the side sealing plate. When the end face of the crystallization roller is embedded into the surface of the side sealing plate to a depth that is, the displacement of the side sealing plate is L≥(1 / 10~1 / 2)d, where d is the thickness of the side sealing plate, in mm, and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to separate the end face of the crystallization roller from the groove on the surface of the side sealing plate; then move the side sealing plate upward or downward until the groove on the side sealing plate is completely out of the range of the end face of the crystallization roller.

2. The method for increasing the casting time of thin strip continuous casting as claimed in claim 1, characterized in that: The side sealing plate is moved downward. After the side sealing plate is installed on the end faces of the two crystallization rollers, the lower part of the side sealing plate contacts the end faces of the crystallization rollers. The end point on one side of the top surface of the side sealing plate is point A, and the bottom surface on the same side intersects with the lower end of the arc line of the crystallization roller to form a lower intersection point as point C. The upper intersection point of the same side of the side sealing plate and the arc line of the crystallization roller is point B, and the intersection point of the top surface of the molten pool and one side of the crystallization roller is point D. The point where the two crystallization rollers are closest is the kiss point, and point C is at least 10mm lower than the kiss point. When the displacement is detected that the side sealing plate is displaced L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate, in mm, and L is in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate downward until point B moves out of the range of the crystallization roller by at least 10mm. At this time, the upper and lower intersection points of the side sealing plate and the arc line of the crystallization roller are point B2 and point B1 respectively. Point B1 is at least 10mm higher than point D, and point A is at least 30mm higher than point B2.

3. The method for increasing the casting time of thin strip continuous casting as claimed in claim 2, characterized in that: The side sealing plate moves downward at a speed of 0.1 to 20 mm / s.

4. The method for increasing the casting time of thin strip continuous casting as claimed in claim 1, characterized in that: When the side sealing plate is moved upward, after the side sealing plate is installed on the end faces of the two crystallization rollers, its upper part contacts the end faces of the crystallization rollers, and the end point on one side of the top face of the side sealing plate is point A. The upper intersection point of the same side with the arc line of the crystallization roller is point B, the lower intersection point with the arc line of the crystallization roller is point B1, the intersection point of the top surface of the molten pool and the crystallization roller on one side is point D, and the point closest to the two crystallization rollers is the kiss point. Point B is at least 10mm higher than point D, and point A is at least 30mm higher than point B. When the displacement is detected that the side sealing plate is displaced L≥(1 / 10~1 / 2)d in the thickness direction compared to the original position, where d is the thickness of the side sealing plate in mm and L in mm; first move the side sealing plate outward along the axis of the crystallization roller to make the end face of the crystallization roller separate from the groove on the surface of the side sealing plate, and then move the side sealing plate upward until point B1 is removed at least 10mm outside the range of the crystallization roller. At this time, the points where the side sealing plate intersects the crystallization roller are point B2 and point C respectively. Point B2 is at least 10mm higher than point D, and point C is at least 10mm lower than the kiss point.

5. The method for increasing the casting time of thin strip continuous casting as claimed in claim 4, characterized in that: The side sealing plate moves upward at a speed of 0.1 to 20 mm / s.

6. A side sealing device for the method for increasing the casting time of thin strip continuous casting as claimed in claim 1, comprising: Two side sealing plates are respectively arranged on the side end surfaces of the two crystallization rollers; characterized in that they also include: A plurality of support rollers and shafts are arranged on the back of the side sealing plate, and the support rollers are against the side sealing plate; Two guide rails are respectively arranged on both sides of the side sealing plate. The guide rail is a U-shaped structure, in which a plurality of rollers and corresponding axles are arranged along the length direction. Corresponding to the axles, guide grooves for the axles to move left and right are arranged on both sides of the U-shaped structure of the guide rail; A plurality of reset pins are respectively arranged on the guide rails at intervals along the length direction of the two guide rails; A plurality of electromagnetic relays are arranged on the outer side of the guide rail through a bracket and correspond to the reset pins one by one respectively; A plurality of reset drive devices respectively correspond to the outer ends of the wheel shafts of the rollers.

7. The side sealing device according to claim 6, characterized in that: The reset pin is U-shaped, one side end of which is located on one side of the guide rail on the back side of the side sealing plate, and the electromagnetic relay corresponds to the side end.

8. The side sealing device according to claim 6, characterized in that: The reset drive device comprises a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

9. The side sealing device according to claim 6 or 7, characterized in that: The lower part of the side sealing plate is trapezoidal.

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