A double-sided reinforced cooling single-roll horizontal thin strip continuous casting system and a continuous casting method thereof

Abstract

The present application relates to a kind of double-side reinforced cooling single-roll horizontal thin strip continuous casting system, including tundish, conveying belt, upper gas cooling blowing system and lower water cooling spraying system;Tundish bottom is equipped with slit type outlet for metal melt to flow out, conveying belt is arranged below slit type outlet for receiving metal melt and making metal melt spread on its surface into metal melt layer;Lower water cooling spraying system is used to spray cooling water to the bottom surface of conveying belt, and metal melt layer is cooled by solid heat transfer;Upper gas cooling blowing system is located above conveying belt and is relatively close to the side of tundish, and metal melt layer is cooled by blowing cooling inert gas.When metal solution flows out from the bottom slit type outlet of tundish under the action of conveying belt to mill, under the combined action of two kinds of cooling mechanism, the cooling speed and cooling degree of the upper and lower surfaces of metal melt layer are close to consistent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin strip casting, in particular to a double-side reinforced cooling single-roll horizontal thin strip continuous casting system and a continuous casting method thereof. BACKGROUND

[0002] At present, the traditional thin strip continuous casting industrialization practice is mainly based on double-roll thin strip continuous casting (TRC), and many double-roll thin strip continuous casting production lines have been built and put into operation internationally, including Castrip of New York Company, Eurostrip of Thyssen Krupp, PoStrip of POSCO in South Korea and other projects. After long-term technical research and development with domestic research institutions, Baosteel built the first thin strip continuous casting industrialization demonstration line with independent intellectual property rights in Ningbo, and completed the production verification in 2016.

[0003] The double-roll thin strip continuous casting (TRC) is shown in FIG. Figure 1 In the actual application process, there are many problems, including: (1) the metal melt must complete the solidification process between the double rollers, and the distance between the rollers is very small, so the TRC process can only produce strip steel with a thickness of less than 3mm, and the output of a single production line is extremely low, which cannot meet the high production rhythm of modern steel companies; (2) the metal melt enters the solidification zone under the action of gravity, and it is not easy to control the pulling speed, and the phenomenon of thin strip leakage and breakage is easy to occur; (3) in addition, inclusions can cause stress concentration in the solidification process of the thin strip, which causes the risk of thin strip rupture at high pulling speed; therefore, the high-speed solidification process requires molten steel with high cleanliness, which also increases the cost of molten steel of the TRC process.

[0004] Due to the limitations of the TRC process itself, it generally has problems such as unstable operation, low output, and high molten steel cost. Therefore, it is urgent to develop a more stable, efficient, and low-cleanliness thin strip continuous casting technology to promote the industrialization and large-scale application of near-net shape casting (casting method close to the size and shape of the final product), alleviate the difficulties of low-end overcapacity and high-end supply shortage in the steel industry, and has important significance for realizing the supply-side structural reform of the steel industry. SUMMARY

[0005] (I) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present application provides a double-side reinforced cooling single-roll horizontal thin strip continuous casting system and a continuous casting method thereof. Compared with the prior art, the present application can be used to produce thin strip products with a wider thickness range, and is not easy to occur thin strip leakage and breakage, has a high tolerance to the cleanliness of the metal melt, and can reduce the segregation degree of elements such as P and S in the metal melt when producing thicker thin strips, and ensure the uniformity of the thin strips in the thickness direction.

[0007] (II) Technical Solution

[0008] In a first aspect, the present application provides a double-side strengthened cooling single-roll horizontal thin strip continuous casting system for reducing segregation of thin strip, comprising a tundish, a conveyor belt, an upper gas cooling blowing system and a lower water cooling spraying system.

[0009] The tundish is used for containing a metal melt, and a slit-type outlet is arranged at the bottom of the tundish for the metal melt to flow out; the conveyor belt is arranged below the slit-type outlet for receiving the metal melt and spreading the metal melt on the surface of the conveyor belt into a metal melt layer; and the lower water cooling spraying system is used for spraying cooling water to the bottom surface of the conveyor belt, and the metal melt layer is cooled by the heat conduction of the conveyor belt and then enters a rolling mill for rolling.

[0010] The upper gas cooling blowing system is arranged above the conveyor belt and is used for spraying cooling inert gas to the upper surface of the metal melt layer; and the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer are close to each other under the combined action of the lower water cooling spraying system and the upper gas cooling blowing system.

[0011] According to a preferred embodiment of the present application, a flow guide slope made of refractory material is arranged below the slit-type outlet of the tundish, and the flow guide slope is connected with the conveyor belt, so that the metal melt flows out of the slit-type outlet of the tundish and reaches the surface of the conveyor belt along the flow guide slope.

[0012] According to a preferred embodiment of the present application, the conveyor belt has a frosted surface, so as to reduce the thermal resistance between the substrate and the cavities of the metal melt layer and improve the heat conduction efficiency. The conveyor belt is a copper film or strip material which is thin and can be coiled into a conveyor belt.

[0013] According to a preferred embodiment of the present application, the conveyor belt is in the form of a track, and a closed loop structure is formed by connecting the track at the head and tail, and a conveyor roller is arranged in the closed loop structure. The conveyor roller is rotated to drive the conveyor belt to rotate circularly, and the conveyor belt drives the metal melt layer on the surface thereof to move towards the rolling mill. In the moving process, the metal melt layer is solidified into a casting blank under the double cooling actions of the lower water cooling spraying system spraying cooling water to the lower surface of the conveyor belt and the upper gas cooling blowing system spraying cooling inert gas.

[0014] According to a preferred embodiment of the present application, the conveyor roller is two or more, and a plurality of supporting roller shafts are arranged between adjacent two conveyor rollers, so as to support the conveyor belt and keep the surface of the conveyor belt flat.

[0015] According to a preferred embodiment of the present application, the upper gas cooling blowing system is arranged above the conveyor belt and close to the tundish, and is used for gas cooling the upper surface of the metal melt just flowing out of the slit-type outlet of the tundish.

[0016] According to the preferred embodiment of the present application, the lower end of the upper gas cooling blowing system is provided with a blowing pipe, and the blowing port is below the blowing pipe, which is in the shape of a round hole or a long and narrow slit. Preferably, the width of the upper gas cooling blowing system is 5-15 cm, and more preferably 10 cm.

[0017] According to the preferred embodiment of the present application, the width of the upper gas cooling blowing system is greater than the width of the conveying belt. Preferably, the upper gas cooling blowing system extends 10-20 cm, and more preferably 15 cm, beyond the left and right sides of the conveying belt.

[0018] According to the preferred embodiment of the present application, the distance between the blowing port and the metal melt layer is 50-80 cm, and more preferably 65 cm. Too close distance can easily cause the metal melt layer to be blown apart.

[0019] According to the preferred embodiment of the present application, the initial velocity direction of the cooling inert gas blown by the blowing port forms an angle of 30°-60°, and more preferably 45°, with the moving direction of the conveying belt.

[0020] According to the preferred embodiment of the present application, a control center is further included. Temperature sensors are arranged above and below the conveying belt to measure the temperature of the upper surface of the metal melt layer and the lower surface of the conveying belt, respectively. The upper gas cooling blowing system is provided with a first control module for regulating the blowing speed of the cooling inert gas, and the lower water cooling spraying system is provided with a second control module for regulating the spraying speed of the cooling water. The temperature sensors are in communication connection with the control center. The control center sends control instructions to the first and second control modules according to the temperature data collected by the temperature sensors, so that the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer are close to each other. Preferably, the control center is a computer or a single-chip microcomputer.

[0021] According to the preferred embodiment of the present application, the upper gas cooling blowing system is provided with an angle adjusting mechanism and / or a vertical height adjusting mechanism. The angle adjusting mechanism can adjust the orientation of the blowing port of the upper gas cooling blowing system, so that it can scan the blowing of the cooling inert gas within a certain angle range. The vertical height adjusting mechanism can adjust the distance between the blowing port of the upper gas cooling blowing system and the upper surface of the metal melt layer. Alternatively, the number of the upper gas cooling blowing systems is two or more, which are arranged above the conveying belt and spaced apart from each other.

[0022] According to the preferred embodiment of the present application, the upper gas cooling blowing system is connected to a low-temperature inert gas source, or the upper gas cooling blowing system is connected to an inert gas source through a pipeline, and a cooler is arranged on the pipeline to cool the inert gas in the pipeline before output. The inert gas is argon with a purity of 99.99% or above.

[0023] According to the preferred embodiment of the present application, the double-side reinforced cooling single-roll horizontal thin strip continuous casting system further comprises a transition roller mechanism, the upper surface of the transition roller mechanism is level with the conveying belt, and the transition roller mechanism is connected between the end of the conveying belt and the rolling mill, for transmitting the solidified metal melt layer (casting blank) conveyed by the conveying belt to the rolling mill for rolling.

[0024] In a second aspect, the present application provides a thin strip continuous casting method, which is produced by using the double-side reinforced cooling single-roll horizontal thin strip continuous casting system of any of the above embodiments.

[0025] (Three) beneficial effects

[0026] (1) Compared with the prior art, the double-side reinforced cooling single-roll horizontal thin strip continuous casting system of the present application can be used to continuously produce thin strip products with a wider thickness range (1-15 mm), while the TRC process can only produce 3 mm strip steel; the single-roll horizontal thin strip continuous casting system of the present application does not form a casting blank by extruding and pulling the steel melt, but makes the metal melt flow out of the tundish slit-type outlet to the upper surface of the conveying belt, and gradually forms a continuous metal melt layer spread on the upper surface of the conveying belt with the uniform horizontal movement of the conveying belt. The bottom of the metal melt is supported by the cooling matrix, so it is not easy to form thin strip leakage and breakage compared with the TRC technology, and it also has higher adaptability to the cleanliness of the metal melt, which can reduce the cost of the metal melt.

[0027] (2) The double-side reinforced cooling single-roll horizontal thin strip continuous casting system of the present application, under the combined action of the lower water cooling spray system and the upper gas cooling blowing system, makes the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer close to uniform, makes the solidification of the upper and lower surfaces of the metal melt layer more uniform, reduces the segregation of the metal melt layer in the thickness direction, ensures the uniformity of the thin strip in the thickness direction, and effectively improves the quality of the thin strip when the thickness of the metal melt layer M is large. The present application also realizes real-time monitoring and closed-loop control of the cooling intensity of the upper and lower surfaces of the metal melt layer by means of temperature sensors, a control module of the upper gas cooling blowing system, a control module of the lower water cooling spray system, and a computer control center, so that the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer are as close as possible.

[0028] (3) The double-side reinforced cooling single-roll horizontal thin strip continuous casting system provided by the present application is based on the original single-roll horizontal thin strip continuous casting system (sub-fast solidification horizontal thin strip continuous casting), and an upper gas cooling blowing system is arranged in a certain area above the conveying belt and close to the tundish on one side, which can accelerate the condensation speed of the upper side of the metal melt layer (the lower side has a lower water cooling spray system), so that the peak value of the heat flux density of the upper layer of the steel liquid reaches 32.5 MW / m 2The lower cooling matrix support avoids the risk of thin strip breakage in the double-roller thin strip continuous casting, can effectively control the solidification speed by adjusting the cooling water flow and the cooling gas blowing flow, reduce the segregation degree of P, S and other elements, and make the solidification structure more uniform. Through scanning electron microscope detection, more refined pearlite structure is developed on the surface and bottom of the thin strip, which can effectively inhibit the grain boundary diffusion and dislocation movement, thereby improving the mechanical properties of the steel.

[0029] (4) After the metal melt of the tundish flows out from the slit type outlet, backflow is formed in the gap between the outlet and the conveying belt, and once the backflow solidifies, it will affect the smoothness of the horizontal continuous casting process. In order to prevent this from happening, the present application introduces a flow guide slope made of refractory material between the slit type outlet and the conveying belt, so that the metal melt has a certain horizontal velocity component after flowing out from the slit type outlet, effectively inhibiting the backflow effect of the gap and improving the stability of the horizontal continuous casting process.

[0030] (5) In the preferred embodiment of the present application, the upper gas cooling blowing system is provided with an angle adjusting mechanism and / or a vertical height adjusting mechanism. The angle adjusting mechanism can adjust the orientation of the blowing port of the upper gas cooling blowing system, so that it can perform scanning blowing cooling of the inert gas within a certain angle range, so as to realize blowing cooling of the metal melt layer within a length range. The vertical height adjusting mechanism can adjust the distance from the blowing port of the upper gas cooling blowing system to the upper surface of the metal melt layer, which can also achieve the purpose of adjusting the cooling speed of the upper surface of the metal melt layer. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the double-sided reinforced cooling single-roller horizontal thin strip continuous casting system of the present application.

[0032] Figure 2 It is a schematic diagram of the structure of the upper gas cooling blowing system of the double-sided reinforced cooling single-roller horizontal thin strip continuous casting system of the present application.

[0033] Figure 3 It is a schematic diagram of the flow guide slope arranged below the slit type outlet in the double-sided reinforced cooling single-roller horizontal thin strip continuous casting system of the present application.

[0034] Figure 4 It is a schematic diagram of the upper gas cooling blowing system of the double-sided reinforced cooling single-roller horizontal thin strip continuous casting system of the present application, in which the width of the upper gas cooling blowing system is greater than the width of the two sides of the conveying belt. DETAILED DESCRIPTION

[0035] In order to better explain the present application and facilitate understanding, the present application will be described in detail in combination with the drawings and through specific embodiments.

[0036] Example 1

[0037] like Figure 2 The figure shows a double-sided enhanced cooling single-roll horizontal thin strip continuous casting system for reducing thin strip segregation of the present invention, which includes a tundish 1, a conveyor belt 2, an upper air cooling spray system 3, a lower water cooling spray system 4, a conveyor roller 5, a support roller shaft 6, a transition roller mechanism 7, and a rolling mill 8. The tundish 1 is used to hold the molten metal and has a slit outlet 11 ( Figure 4 for the molten metal to flow out.

[0038] The conveyor belt 2 is located below the slit outlet 11 and is used to receive the molten metal and spread it onto the surface of the conveyor belt 2 into a molten metal layer M. A lower water-cooling spray system 4 is located below the conveyor belt 2 and is used to spray cooling water onto the bottom surface of the conveyor belt 2. This cooling water cools the molten metal layer M through solid heat transfer through the conveyor belt 2 before it enters the rolling mill 8 for rolling into a thin strip. An upper air-cooling spray system is located above the conveyor belt 2 and is used to spray a cooling inert gas onto the upper surface of the molten metal layer M. Preferably, the cooling inert gas is argon with a content of 99.99% or more, as this gas avoids reacting with the molten metal M and affecting its alloy composition. Among them, under the combined action of the upper air-cooling spray system 3 and the lower water-cooling spray system 4, the cooling rate and cooling degree of the upper and lower surfaces of the metal melt layer M are close to the same before entering the rolling mill 8, so that the metal melt layer M solidifies more evenly, reduces the segregation of the metal melt layer in the thickness direction, ensures the uniformity of the thin strip in the thickness direction, and improves the quality of the thin strip.

[0039] The upper surface of the transition roller mechanism 7 is flush with the conveyor belt 2 and is connected between the end of the conveyor belt 2 and the rolling mill 8. It is used to transfer the solidified metal melt layer M (cast billet) conveyed by the conveyor belt 2 to the rolling mill 8 for rolling. Utilizing the transition connection of the transition roller mechanism 7 can reduce the length and cost of the conveyor belt 2 and prevent the conveyor belt 2 from being easily deformed by creep and collapse due to excessive span.

[0040] The conveyor belt 2 preferably has a frosted surface to reduce the thermal resistance between the matrix and the cavities in the molten metal layer, thereby improving thermal conductivity. The conveyor belt 2 is constructed of a soft film or strip of beryllium copper or steel, which offers sufficient strength and can be rolled like a conveyor belt. Beryllium copper or steel has excellent thermal conductivity and can more quickly transfer the cooling energy from the lower water-cooled spray system 4 to the molten metal M, cooling and solidifying the molten metal M.

[0041] like Figure 2As shown, the conveyor belt 2 is in the form of a track, which constitutes a closed loop structure with the conveyor rollers 5 arranged therein, and the conveyor rollers 5 are rotated to drive the conveyor belt 2 to rotate circularly, and the conveyor belt 2 drives the metal melt layer M on the upper surface thereof to move towards the rolling mill 8. The number of the conveyor rollers 5 is two, which are arranged at the two ends of the closed loop structure constituted by the conveyor belt 2, and a plurality of support roller shafts 6 are arranged between the two conveyor rollers 5, which support the conveyor belt 2 to keep the surface thereof flat, so as to avoid the soft collapse of the portion between the two conveyor rollers 5.

[0042] As shown, the upper gas cooling blowing system 3 is arranged above the conveyor belt 2 and close to the tundish 1, which is used for gas cooling the upper surface of the metal melt just flowing out of the slit type outlet 11 of the tundish 1. The lower end of the upper gas cooling blowing system 3 is provided with a blowing pipe 32, and the blowing port 31 is arranged below the blowing pipe 32 (as shown), which is in the form of a circular hole. Figure 3 As shown, the upper gas cooling blowing system 3 is arranged above the conveyor belt 2 and close to the tundish 1, which is used for gas cooling the upper surface of the metal melt just flowing out of the slit type outlet 11 of the tundish 1. The lower end of the upper gas cooling blowing system 3 is provided with a blowing pipe 32, and the blowing port 31 is arranged below the blowing pipe 32 (as shown), which is in the form of a circular hole.

[0043] As shown, the upper gas cooling blowing system 3 is directly connected with the low-temperature inert gas source, or the upper gas cooling blowing system 3 is connected with the inert gas source through a pipe, and a cooler is arranged on the pipe, which is used for cooling the inert gas in the pipe and then blowing out from the blowing port 31. A jacket structure can also be arranged outside the plurality of pipes in the upper gas cooling blowing system 3, and a circulating cooling medium is passed through the jacket structure, so as to cool the gas blown out from the upper gas cooling blowing system 3. Figure 3 As shown, the upper gas cooling blowing system 3 is directly connected with the low-temperature inert gas source, or the upper gas cooling blowing system 3 is connected with the inert gas source through a pipe, and a cooler is arranged on the pipe, which is used for cooling the inert gas in the pipe and then blowing out from the blowing port 31. A jacket structure can also be arranged outside the plurality of pipes in the upper gas cooling blowing system 3, and a circulating cooling medium is passed through the jacket structure, so as to cool the gas blown out from the upper gas cooling blowing system 3.

[0044] Figure 4 As shown, the length of the blowing port 31 is greater than the length of the conveyor belt 2, so as to ensure that the inert gas blown downward by the upper gas cooling blowing system 3 can cover the two sides of the metal melt layer M. Preferably, the width of the upper gas cooling blowing system 3 is greater than the width of the conveyor belt 2 by a distance L, and L is 10-20 cm, preferably L is 15 cm.

[0045] As shown, the length of the blowing port 31 is greater than the length of the conveyor belt 2, so as to ensure that the inert gas blown downward by the upper gas cooling blowing system 3 can cover the two sides of the metal melt layer M. Preferably, the width of the upper gas cooling blowing system 3 is greater than the width of the conveyor belt 2 by a distance L, and L is 10-20 cm, preferably L is 15 cm. Figure 4 As shown, the distance between the blowing port 31 and the metal melt layer is H, and H is 50-80 cm, preferably H is 65 cm. If the distance is too short, the metal melt layer M is easily blown off, and if the distance is too long, the cooling effect is poor.

[0046] As shown, the length of the blowing port 31 is greater than the length of the conveyor belt 2, so as to ensure that the inert gas blown downward by the upper gas cooling blowing system 3 can cover the two sides of the metal melt layer M. Preferably, the width of the upper gas cooling blowing system 3 is greater than the width of the conveyor belt 2 by a distance L, and L is 10-20 cm, preferably L is 15 cm. Figure 4 ​As shown, the initial velocity direction of the cooling inert gas blown out by the blowing port 31 forms an angle α with the moving direction of the conveying belt 2, α = 30°-60°, preferably 45°. In this way, the cooling inert gas blown out can act on the metal melt layer M at the optimal angle, reducing the waste amount of the inert gas.

[0047] After the metal melt in the tundish flows out from the slit-shaped outlet, a backflow is formed between the outlet and the conveying belt 2, and the backflow will solidify once, which will affect the smoothness of the horizontal continuous casting process. For example, if no flow guide slope 9 is provided, the metal melt M directly falls vertically from the slit-shaped outlet 11, and the metal melt M will flow to the left and right and even accumulate, and with the time of flowing out of the tundish 1 becoming longer, partial solidification occurs, the slit-shaped outlet 11 is blocked, and it is easy to cause the continuous casting to be unable to proceed. In order to prevent this situation from occurring, as shown, Figure 4 As shown, a flow guide slope 9 made of refractory material is arranged below the slit-shaped outlet 11 of the tundish 1, and the flow guide slope 9 is connected with the conveying belt 2, so that the metal melt flows along the surface of the flow guide slope 9 to the surface of the conveying belt 2 after flowing out from the slit-shaped outlet 11 of the tundish 1. By introducing the structure of the flow guide slope 9 made of refractory material, the metal melt has a certain horizontal velocity component immediately after flowing out from the slit-shaped outlet 11, which effectively suppresses the problem that the backflow occurs between the slit-shaped outlet 11 and the conveying belt 2, solidifies, and causes the horizontal continuous casting process to be unable to proceed smoothly.

[0048] Example 2

[0049] The difference between this embodiment and Example 1 is that the blowing port of the upper gas cooling blowing system 3 is a long and narrow slit-shaped port. That is, the upper gas cooling blowing system 3 is no longer divided into a plurality of pipes to form a pipe row, but is a whole cavity, which is directly connected with the low-temperature inert gas source, or is connected with the inert gas source through a pipe, and a cooler is arranged on the pipe, and the cold quantity of the cooler is used for cooling the inert gas in the pipe and then blowing out from the long and narrow slit-shaped port.

[0050] Example 3

[0051] The difference between the present embodiment and embodiment 1 is that the double-sided reinforced cooling single-roll horizontal thin strip continuous casting system further comprises a control center, which is a control background or a computer installed with specific programs. Non-contact temperature sensors are arranged above and below the conveying belt 2 to measure the temperature of the upper surface of the metal melt layer M and the lower surface of the conveying belt 2, respectively. The upper gas cooling blowing system 3 is provided with a first control module for regulating the blowing speed of the cooling inert gas, and the lower water cooling spraying system 4 is provided with a second control module for regulating the spraying speed of the cooling water. The non-contact temperature sensors are communicatively connected to the control center, and the control center compares the temperature data collected by the non-contact temperature sensors and sends control instructions to the first control module and the second control module according to the difference, so as to realize automatic control to make the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer M consistent.

[0052] Embodiment 4

[0053] The difference between the present embodiment and embodiment 1 is that the upper gas cooling blowing system 3 is further provided with an angle adjusting mechanism and / or a vertical height adjusting mechanism. The angle adjusting mechanism can adjust the orientation of the blowing port 31 of the upper gas cooling blowing system 3, so that the orientation of the blowing port 31 changes, and the upper surface of the metal melt M can be scanned and blown and cooled within a certain angle range, and a section of the metal melt M can be blown and cooled. The vertical height adjusting mechanism can adjust the distance from the blowing port of the upper gas cooling blowing system 3 to the upper surface of the metal melt layer M, so that the distance from the blowing port 31 to the metal melt layer can be adjusted according to the ambient temperature, the type of metal melt, and the viscosity of the melt. For example, a metal melt with too small viscosity is not easy to be blown and cooled at a close distance.

[0054] Embodiment 5

[0055] The difference between the present embodiment and embodiment 1 is that the number of the upper gas cooling blowing systems 3 is 2 or more, and the adjacent two upper gas cooling blowing systems are spaced apart. The plurality of upper gas cooling blowing systems 3 are distributed along the conveying direction of the metal melt layer M, and the blowing and cooling speed of the inert gas of the upper gas cooling blowing system 3 at the rear is smaller or the blowing amount is less.

[0056] Finally, it should be pointed out that the technical features in the above embodiments can be combined and stacked without contradiction, but even so, it should not deviate from the scope of the technical solution of the present application.

[0057] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced or combined, and these modifications or replacements or combinations do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A twin-sided, intensively cooled, single-roll, horizontal thin strip continuous casting system, characterized in that, Comprise: a tundish, a conveyor belt, an upper gas cooling blowing system and a lower water cooling spraying system; the tundish is used for containing metal melt, the tundish bottom is provided with a slit type outlet for the metal melt to flow out; the conveyor belt is arranged below the slit type outlet for receiving the metal melt and spreading the metal melt on the conveyor belt surface into a metal melt layer; the lower water cooling spraying system is used for spraying cooling water to the conveyor belt bottom surface, and the metal melt layer is cooled by the heat conduction of the conveyor belt and then enters a rolling mill for rolling; a flow guide slope made of refractory material is arranged below the slit type outlet of the tundish, the flow guide slope is connected with the conveyor belt, so that the metal melt flows out from the slit type outlet of the tundish and reaches the conveyor belt surface along the flow guide slope; the upper gas cooling blowing system is arranged above the conveyor belt and is used for spraying cooling inert gas to the upper surface of the metal melt layer; under the combined action of the lower water cooling spraying system and the upper gas cooling blowing system, the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer are close to uniform; a control center is further included; non-contact temperature sensors are arranged above and below the conveyor belt respectively, the temperature sensors are used for measuring the temperature of the upper surface of the metal melt layer and the lower surface of the conveyor belt respectively; the upper gas cooling blowing system is provided with a first control module for regulating and controlling the blowing speed of the cooling inert gas, and the lower water cooling spraying system is provided with a second control module for regulating and controlling the spraying speed of the cooling water; the temperature sensors are in communication connection with the control center, the control center sends control instructions to the first control module and the second control module according to the temperature data collected by the temperature sensors, so that the cooling speed and cooling degree of the upper and lower surfaces of the metal melt layer are close to uniform.

2. The twin-sided, intensively cooled, single-roll, horizontal thin strip casting system according to claim 1, characterized in that The conveyor belt is in the form of a track, which constitutes a closed loop structure with the first end connected with the second end, a conveyor roller is arranged in the closed loop structure, the conveyor roller rotates to drive the circulation of the conveyor belt, and in turn drives the metal melt layer on the upper surface of the conveyor belt to move towards the rolling mill, and in the moving process, the metal melt layer solidifies into a casting blank under the double cooling actions of the lower water cooling spraying system spraying cooling water to the lower surface of the conveyor belt and the upper gas cooling blowing system spraying cooling inert gas; a plurality of support roller shafts are arranged between adjacent two conveyor rollers, and the support roller shafts are used for supporting the conveyor belt to keep the surface flat.

3. The twin-sided, intensively cooled, single-roll, horizontal thin strip casting system of claim 1, wherein, The upper gas cooling blowing system is arranged above the conveyor belt and is located at one end close to the tundish, and is used for gas cooling the upper surface of the metal melt just flowing out from the slit type outlet of the tundish.

4. The twin-sided, intensively cooled, single-roll, horizontal thin strip casting system of claim 1, wherein, A blowing pipe is arranged at the lower end of the upper gas cooling blowing system, and the blowing port on the blowing pipe is in the form of a round hole or a long and narrow slit.

5. The twin-sided, strongly cooled, single-roll, horizontal thin strip casting system of claim 4, wherein, The distance from the blowing port to the metal melt layer is 50-80 cm; the initial speed direction of the cooling inert gas blown out by the upper gas cooling blowing system forms an angle of 30°-60° with the moving direction of the conveyor belt.

6. The twin-sided, intensively cooled, single-roll, horizontal thin strip casting system of claim 4, wherein, The upper gas cooling blowing system is provided with an angle adjusting mechanism and / or a vertical height adjusting mechanism, the angle adjusting mechanism can adjust the orientation of the blowing port of the upper gas cooling blowing system, so that it can scan and blow the inert gas within a certain angle range; the vertical height adjusting mechanism can adjust the distance between the blowing port of the upper gas cooling blowing system and the upper surface of the metal melt layer; or the number of the upper gas cooling blowing systems is 2 or more, which are arranged above the conveying belt and are spaced apart from each other.

7. The twin-sided, intensively cooled, single-roll, horizontal thin strip casting system of claim 1, wherein, The double-side reinforced cooling single-roll horizontal thin strip continuous casting system further comprises a transition roller mechanism, the upper surface of the transition roller mechanism is parallel to the conveying belt, and the transition roller mechanism is connected between the end of the conveying belt and the rolling mill, for transmitting the solidified metal melt layer conveyed by the conveying belt to the rolling mill for rolling.

8. A thin strip continuous casting method characterized by, The double-side reinforced cooling single-roll horizontal thin strip continuous casting system is used for production.

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