A cast roll capable of realizing internal water spraying structure and a cooling method

Abstract

The application provides a cast-rolling roller capable of realizing internal water spraying structure and a cooling method, and is applied to the field of cast-rolling equipment, and comprises a roller core (1), a roller sleeve (2) and a shaft core (3). The roller core (1) is a hollow I-shaped column and is assembled with the roller sleeve (2) in an interference mode to form a cavity (8). A channel (4) is arranged on the roller core (1) and is used for slidingly assembling the shaft core (3). The shaft core (3) divides the channel (4) into two semicircular channels which are not connected with each other. The channel (4) and the cavity (8) are communicated through a through hole (7), so that the problem of water path distribution and temperature difference between the water outlet and the water inlet is essentially changed.

Description

Technical Field

[0001] This invention relates to the field of casting and rolling equipment, and more specifically to a casting and rolling roll capable of achieving an internal water spray structure and a cooling method thereof. Background Technology

[0002] The twin-roll casting process involves directly injecting molten metal between two relatively rotating casting rolls. The metal is then solidified and cooled by the rolls, and deformed during rolling to form the desired sheet or foil product. Traditional casting rolls consist of a core and a sleeve assembly. Water channels with specific structures and dimensions are created on the surface of the core or inside the sleeve. During casting, cold water flows through the rolls, cooling them. However, due to the distribution of the water channels and the temperature difference between the inlet and outlet, the cooling capacity of the cold water is weak, and the temperature distribution is uneven. This leads to defects such as center segregation, surface segregation, and rolling cracks in the slab, making production impossible when producing high-alloy thin sheet products.

[0003] Patent US20040129403 employs an axial flow-around water channel structure, which can effectively improve the uniformity of axial temperature distribution in casting rolls. However, it is difficult to guarantee temperature uniformity in the axial direction. Patent US6527042 discloses an axial single-channel multi-groove water channel structure, which can effectively improve the circumferential temperature distribution in casting rolls. However, the cooling at the convergence point of multiple grooves is significantly increased, affecting the overall temperature uniformity of the casting rolls.

[0004] The above patents all optimize different water channel structures for casting rolls, but they cannot fundamentally change the distribution of the water channels or the uneven temperature distribution of the rolls caused by the temperature difference between the outlet and inlet. They cannot meet the higher requirements for roll cooling intensity and uniformity in the preparation of high alloy plates. Summary of the Invention

[0005] To address the problem that the existing water channel structure of the casting roll cannot fundamentally change the distribution of the water channel and that the uneven temperature distribution of the roll caused by the temperature difference between the outlet and the inlet, this invention provides a casting roll structure that realizes in-roll water spray cooling, including: a roll sleeve (2), a roll core (1) and a shaft core (3). The roller core (1) is a hollow I-shaped column with a radial through hole (7) that connects the channel (4) and the annular cavity (8). The roller core (1) is provided with a channel (4) for sliding assembly of the shaft core (3); The shaft core (3) includes a cylindrical shell, a horizontal partition (5), and a cylindrical solid. One end of the horizontal partition (5) passes through the interior of the cylindrical shell and is fixedly connected to the cylindrical shell, while the other end is fixedly connected to the cylindrical solid. The cylindrical shell, the inner diameter of the cylindrical solid, the diameter of the channel (4), and the width of the horizontal partition (5) are the same.

[0006] Preferably, there are multiple through holes (7), which are evenly distributed on the hollow I-shaped column body.

[0007] Preferably, it further includes a support column (6) for supporting the roller sleeve (2) on the column body of the hollow I-shaped column of the roller core (1).

[0008] Preferably, there are multiple support columns (6), which are evenly distributed on the column body of the annular hollow I-shaped column.

[0009] Based on the same inventive concept, the present invention also provides a cooling method for a casting roll structure, comprising: The shaft core (3) divides the channel (4) of the roller core (1) into two semicircular channels that are not connected vertically; Cold water is injected through the semi-circular channel located above and flows into the annular cavity (8) through the through hole (7) that connects the channel (4) to the annular cavity (8); When the injected cold water reaches the flow balance, continue to inject cold water into the semi-circular channel located above. The air pressure in the annular cavity (8) increases, causing the cold water to be sprayed through the through hole (7) and the annular cavity (8) onto the inner surface of the roller sleeve (2). The cold water sprayed onto the inner surface of the roller sleeve (2) carries away the heat from the inner surface of the roller sleeve (2), flows back through the annular cavity (8) and the through hole (7) to the lower semicircular channel, and then the return water is discharged from the casting roll through the lower semicircular channel.

[0010] Preferably, the method of dividing the channel (4) of the roller core (1) by the shaft core (3) into two semicircular channels that are not connected vertically includes: The cylindrical shell and cylindrical body of the shaft core (3) are located at both ends of the channel (4). The cylindrical shell and cylindrical body are connected by the horizontal partition (5) of the shaft core (3), and the channel (4) is divided into an inlet channel and an outlet channel that are not connected vertically. The cylindrical shell, the inner diameter of the cylindrical solid, the diameter of the channel (4), and the width of the horizontal partition (5) are the same.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a casting roll capable of realizing an internal water spray structure, comprising: a roll sleeve (2), a roll core (1), and a shaft core (3); the roll core (1) is a hollow I-shaped column and is press-fitted with the roll sleeve (2) to form an annular cavity (8); the hollow I-shaped column of the roll core (1) is provided with a through hole (7) connecting the channel (4) and the annular cavity (8); the axial direction of the roll core (1) is provided with a channel (4) for slidingly assembling the shaft core (3); the shaft core (3) holds the internal water spray structure of the roll core (2) and the roll core (3) together with the roll core (2) to form an annular cavity (8). The channel (4) is divided into two semi-circular channels that are not connected vertically; the shaft core (3) includes a cylindrical shell, a horizontal partition (5) and a cylindrical solid; one end of the horizontal partition (5) passes through the interior of the cylindrical shell and is fixedly connected to the cylindrical shell, and the other end is fixedly connected to the cylindrical solid; the inner diameter of the cylindrical shell and the cylindrical solid, the diameter of the channel (4) and the width of the horizontal partition (5) are the same, which essentially changes the water distribution and the temperature difference between the outlet and the inlet.

[0012] 2. The support column (6) used in this invention is used to support the roller sleeve (2), which enhances the stability of the casting roll.

[0013] 3. In this invention, multiple through holes (7) are evenly distributed on the hollow I-shaped column of the roller core (1), and the injected cold water is evenly sprayed onto the inner surface of the roller sleeve (2) through the through holes (7), which overcomes the problem of uneven temperature distribution on the casting and rolling roll. 4. The technical solution of the present invention increases the air pressure in the annular cavity (8) by increasing the amount of water in the cavity, so that the water injected from the water inlet channel is sprayed onto the inner surface of the roller sleeve (2) through the through hole (7), thus getting rid of the limitation of the traditional method of spraying water by pumping water. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the casting roll structure of the present invention, which enables the internal water spraying structure; Figure 2 This is a schematic diagram of the cast roll shaft core capable of realizing the internal water spray structure according to the present invention; Figure 3 This is a side sectional view of the casting roll structure of the present invention, which enables the internal water spraying structure; Figure 4 This is a schematic diagram of the operation of the casting roll of the present invention, which enables the internal water spray structure; Figure 5 This is a schematic diagram of a conventional slotted core cast roll structure in the prior art. Figure 6 (a) is a cloud map of the temperature distribution on the inner surface of the roller sleeve of the casting roll capable of realizing the internal water spray structure of the present invention; Figure 6(b) is a cloud map of the temperature distribution on the inner surface of the roll sleeve of a conventional roll core cast roll in the prior art; Figure 7 (a) is a temperature distribution cloud map of the portion of the outer surface of the roll sleeve of the casting roll capable of realizing the internal water spray structure of the present invention that contacts the molten aluminum. Figure 7 (b) is a temperature distribution cloud map of the part of the outer surface of the roll sleeve of a conventional roll core in the prior art that contacts the molten aluminum. Figure 8 This is a schematic diagram comparing the temperature distribution of the internal water spray structure of the present invention with that of the conventional roller core casting roll and the aluminum melt contact line in the prior art. Among them, 1. Roller core; 2. Roller sleeve; 3. Shaft core; 4. Channel; 4a. Water inlet channel; 4b. Water outlet channel; 5. Horizontal partition; 6. Support column; 7. Through hole; 7a. Upper through hole; 7b. Lower through hole; 8. Annular cavity; 8a. Upper cavity; 8b. Lower cavity. Detailed Implementation

[0015] In view of the problems in the prior art, the present invention provides a casting roll that can realize an internal water spray structure, which can achieve stronger cooling capacity and cooling uniformity.

[0016] Example 1: This invention provides a casting roll capable of achieving an internal water spray structure, such as... Figure 1 As shown: It includes roller sleeve 2, roller core 1 and shaft core 3; The roller core 1 is a hollow I-shaped column and the roller sleeve 2 are interference-fitted to form an annular cavity 8; the annular cavity 8 is provided with a radial through hole 7 communicating with the annular cavity 8; A cylindrical channel 4 is provided on the roller core 1; The shaft core 3 is slidably assembled inside the cylindrical channel 4 of the roller core 1, dividing the cylindrical channel 4 into two semi-circular channels that are not interconnected. The upper semicircular channel is the water inlet channel 4a, and the lower one is the water outlet channel 4b. The annular cavity 8 located at the top is the upper cavity 8a, and the annular cavity 8 located at the bottom is the lower cavity 8b; The roller core 1 has uniformly small through holes 7 on its hollow I-shaped column body; The cylindrical channel 4 is connected to the outside of the roller core 1 through uniform and fine through holes 7, forming a water channel of inlet channel 4a - upper through hole 7a - upper cavity 8a - lower cavity 8b - lower through hole 7b - outlet channel 4b.

[0017] Using the casting roll structure of this invention, the steps for forming water spray inside the roll are as follows: (a) Pass cold water through until the cold water occupies the lower cavity 8b and the upper cavity 8a is filled with air; (ii) Continue to introduce cold water to compress the air in the annular cavity 8. The gas will squeeze the water surface in the lower cavity 8b and discharge the water from the lower end through hole 7. (iii) After reaching equilibrium, continue to introduce cold water. Since the upper cavity 8a is kept as air, when the cold water enters the upper cavity 8a from the upper through hole 7a, it forms a uniform spray. (iv) Roller sleeve 2 and roller core 1 start to rotate, while shaft core 3 remains stationary. As roller core 1 rotates, upper through hole 7a and lower through hole 7b switch between each other, while maintaining the spraying effect of upper through hole 7a.

[0018] This invention enables water spray cooling inside the casting roll, resulting in a uniform and intense cooling effect, and also makes the circumferential and axial temperature distribution of the roll sleeve 2 uniform.

[0019] During operation, the roller core 1 and roller sleeve 2 rotate at a certain angular velocity, while the shaft core 3 remains fixed and does not rotate.

[0020] The longitudinal cross-section of the roller core 1 is an annular hollow I-shaped column with a cylindrical channel 4 in the center. Several support columns 6 are on the body of the I-shaped column, and the cylindrical channel 4 is connected to the annular cavity 8 through evenly distributed through holes 7.

[0021] The support columns 6 are evenly distributed on the I-shaped column body to support the roller sleeves 2, and the number is greater than 4 and less than 10,000.

[0022] The shaft core 3 has a cylindrical solid at one end and a cylindrical shell at the other end. Both ends are in contact with the cylindrical channel 4 of the roller core 1. There is a horizontal partition 5 in the center, which divides the shaft core 3 into upper and lower parts. The width of the partition 5 is equal to the diameter of the cylindrical channel 4 of the roller core 1, and the thickness of the partition 5 is equal to or slightly larger than the diameter of the through hole 7.

[0023] The diaphragm 5 separates the cylindrical channel 4 into two non-connected parts, with the upper part being the water inlet channel 4a and the lower part being the water outlet channel 4b. The through hole 7 is divided into an upper through hole 7a and a lower through hole 7b by the dividing line of the diaphragm 5 and the shaft core 3. The annular cavity 8 is also divided into an upper cavity 8a and a lower cavity 8b.

[0024] The roller core 1 and roller sleeve 2 are interference-fitted to form an annular cavity 8 inside the casting roll, and the shaft core 3 is installed in the cylindrical channel 4 to form a water passage of inlet channel 4a—upper through hole 7a—upper cavity 8a—lower cavity 8b—lower through hole 7b—outlet channel 4b.

[0025] A method for implementing an internal water spray structure within the casting and rolling mill rolls is as follows: (a) Cold water is introduced through the water inlet channel 4a. The cold water enters the annular cavity 8 through the upper through hole 7a. Due to gravity, the cold water falls to the lower cavity 8b. Some of the air in the annular cavity 8 is discharged through the lower through hole 7b until the cold water occupies the lower cavity 8b and the upper cavity 8a is filled with air.

[0026] (ii) Continue to feed water, which will compress the air in the upper cavity 8a, increase the air pressure in the upper cavity 8a, and compress the water surface in the lower cavity 8b, so that the cold water flows from the lower through hole 7 to the water outlet channel 4b, thereby achieving a balance of cold water flow.

[0027] (iii) After reaching equilibrium, continue to introduce cold water. There is a part of air in the annular cavity 8. When water enters the upper cavity 8a from the upper through hole 7, it is evenly sprayed onto the inner surface of the roller sleeve 2 to form a spray.

[0028] (iv) Roller sleeve 2 and roller core 1 start to rotate, and through hole 7 will also rotate around the central axis. When through hole 7 rotates to the water surface, it becomes upper through hole 7a, which is the water inlet through hole, forming a jet; when radial through hole 7 rotates to the water surface, it becomes lower through hole 7b, which is the water outlet through hole, and the water in the annular cavity 8 flows to the water outlet through lower through hole 7b.

[0029] According to the above-mentioned casting roll and method that can realize the internal water spray structure in the casting roll, in step (II), half of the volume of the annular cavity 8 is air and half of the volume is cold water, and the horizontal surface of the cold water is flush with the transverse partition 5 of the shaft core 3.

[0030] According to the above-mentioned casting roll and method that can realize the internal water spray structure in the casting roll, when the casting roll is working, the air pressure in its annular cavity 8 is 1.01 to 5 times the atmospheric pressure.

[0031] According to the above-mentioned casting roll and method that enables the internal water spray structure in the casting roll, when cold water enters the upper cavity 8a through the upper through hole 7a, it forms a spray.

[0032] According to the above-mentioned casting roll and method that can realize the internal water spray structure in the casting roll, as the roll core 1 and the roll sleeve 2 rotate, the upper through hole 7a and the lower through hole 7b are interchanged, and water enters the annular cavity 8 through the upper through hole 7a to form a spray.

[0033] This invention achieves a balanced state of cold water and air within the annular cavity 8 inside the casting roll, enabling internal water spraying to cool the roll sleeve 2. The cold water is sprayed directly onto the inner surface of the roll sleeve 2, creating a uniform cooling effect and ensuring a uniform circumferential and axial temperature distribution. This effectively avoids the uneven temperature distribution of the roll sleeve 2 caused by water circulation in traditional casting rolls, thus facilitating the preparation of slabs with higher performance requirements.

[0034] Example 2 Based on the same inventive concept, this invention also provides a method for cooling the inside of the casting and rolling mill rolls using an internal water spray structure, as described in Embodiment 1. Figure 1-5 As shown A cast roll capable of realizing an internal water spray structure includes a roll core 1, a roll sleeve 2 and a shaft core 3; Roller sleeve 2 is interference-fitted with roller core 1 to form an annular cavity 8. The annular cavity 8 is connected to the cylindrical channel 4 of roller core 1 through evenly distributed radial through holes 7. The shaft core 3 is slidably assembled inside the cylindrical channel 4 of roller core 1, dividing the cylindrical channel into two semi-circular channels that are not connected vertically, forming a water passage of water inlet channel 4a—upper through hole 7a—upper cavity 8a—lower cavity 8b—lower through hole 7b—water outlet channel 4b.

[0035] A cooling method for a casting roll structure includes: The shaft core 3 divides the channel 4 of the roller core 1 into two unconnected semicircular channels. Cold water is injected through the semi-circular channel located above, and flows into the annular cavity 8 through the through hole 7 that connects the channel 4 to the annular cavity 8; When the injected cold water reaches flow balance, continue to inject cold water into the upper semi-circular channel. The air pressure in the annular cavity 8 increases, causing the cold water to be sprayed through the through hole 7 and the annular cavity 8 onto the inner surface of the roller sleeve 2. The cold water sprayed onto the inner surface of the roller sleeve 2 carries away the heat from the inner surface of the roller sleeve 2, flows back through the annular cavity 8 and the through hole 7 to the lower semicircular channel, and then the return water is discharged from the casting roll through the lower semicircular channel.

[0036] Furthermore, the section where the shaft core 3 divides the channel 4 of the roller core 1 into two non-connected semi-circular channels includes: The cylindrical shell and cylindrical solid of the shaft core 3 are located at both ends of the channel 4. The cylindrical shell and cylindrical solid are connected by the horizontal partition 5 of the shaft core 3, and the channel 4 is divided into an inlet channel and an outlet channel that are not connected vertically. The cylindrical shell, the inner diameter of the cylindrical solid, the diameter of the channel 4, and the width of the horizontal partition 5 are the same.

[0037] The method for achieving internal water spraying in casting rolls with an internal water spray structure is as follows: (a) Cold water is introduced through the water inlet channel 4a. The cold water enters the annular cavity 8 through the upper through hole 7a. Due to gravity, the cold water falls to the lower cavity 8b. Some of the air in the annular cavity 8 is discharged through the lower through hole 7b until the cold water occupies the lower cavity 8b and the upper cavity 8a is filled with air.

[0038] (ii) Continue to fill with water, which will compress the air in the upper cavity 8a and increase the gas pressure in the upper cavity 8a to 1.01 to 5 times the atmospheric pressure. The gas will squeeze the water surface in the lower cavity 8b and make the water flow from the radial through hole 7 at the lower end to the water outlet channel 4b, so as to achieve water flow balance.

[0039] (iii) After reaching equilibrium, continue to introduce cold water. The upper cavity 8a is filled with air. When the cold water enters the upper cavity 8a from the radial through hole 7 at the top, it is evenly sprayed onto the inner surface of the roller sleeve 2 to form a spray.

[0040] (iv) Roller sleeve 2 and roller core 1 start to rotate, and radial through hole 7 will also rotate around the central axis. When radial through hole 7 rotates to the water surface, it becomes upper through hole 7a, which is the water inlet radial through hole 7, forming a jet; when radial through hole 7 rotates to the water surface, it becomes lower through hole 7b, which is the water outlet radial through hole 7, and the water in the annular cavity 8 flows to the outlet through lower through hole 7b.

[0041] Example 3: The invention will now be further described using an aluminum alloy high-speed casting roll as an example.

[0042] The outer diameter of the roller sleeve 2 of the casting roll is 440mm, the thickness is 50mm, the roll width is 500mm, and the material of the roller sleeve 2 is 32CrMo1V alloy steel. The diameter of the central cylindrical channel of the roller core 1 is 50mm, and the roller core 1 is recessed by 70mm. There are 80 support columns 6 with a diameter of 8mm evenly distributed in it. The cylindrical channel is connected to the outside of the roller core 1 through evenly distributed Φ3mm water holes. The shaft core 3 has a diameter of 50mm and is horizontally inserted into the cylindrical channel, dividing the cylindrical channel 4 into two isolated upper and lower parts, forming a water channel of inlet channel 4a—upper through hole 7a—upper cavity 8a—lower cavity 8b—lower through hole 7b—outlet channel 4b.

[0043] The method for achieving internal water spraying in casting rolls with an internal water spray structure is as follows: (a) Cold water is introduced from the water inlet channel 4a at a pressure of 0.3 MPa. The cold water enters the annular cavity 8 through the upper through hole 7a. Due to gravity, the cold water falls to the lower cavity 8b. Some of the air in the annular cavity 8 is discharged through the lower through hole 7b until the cold water occupies the lower cavity 8b and the upper cavity 8a is filled with air.

[0044] (ii) Continue to introduce cold water, which will compress the air in the upper cavity 8a and increase the gas pressure in the upper cavity 8a to 1.1 times the atmospheric pressure. The gas will squeeze the water surface in the lower cavity 8b and cause the water to flow from the radial through hole 7 at the lower end to the water outlet channel 4b, thus achieving water flow balance.

[0045] (iii) After reaching equilibrium, continue to introduce cold water. The upper cavity 8a is kept as air. When the cold water enters the upper cavity 8a from the radial through hole 7 at the top, it is evenly sprayed onto the inner surface of the roller sleeve 2 to form a spray.

[0046] (iv) Roller sleeve 2 and roller core 1 start to rotate at an angular velocity of 4.545 rad / min, shaft core 3 keeps rotating, and radial through hole 7 will start to rotate with roller core 1. When radial through hole 7 rotates to the water surface, it becomes upper through hole 7a, which is the water inlet through hole, forming a jet; when radial through hole 7 rotates to the water surface, it becomes lower through hole 7b, which is the water outlet through hole, and the water in the annular cavity 8 flows to the water outlet through lower through hole 7b.

[0047] Numerical simulation of the temperature distribution during the aluminum alloy casting and rolling process was used to analyze and compare the cooling intensity and uniformity of the structure of a conventional slotted casting roll with that of the present invention. The structure of a conventional slotted casting roll is as follows: Figure 5 As shown, circumferentially spaced water grooves with a diameter of 10 mm are opened on the inner surface of the roll core 1. The casting and rolling process is as follows: slab thickness 8 mm, casting and rolling speed 1 m / min, aluminum liquid casting temperature 973 K, and cooling water flow rate 75 L / min.

[0048] Under the same casting and rolling process, the temperature distribution on the inner surface of the roller sleeve 2 of the present invention and the conventional structure is as follows: Figure 6 a and Figure 6 As shown in Figure b, the temperature distribution on the inner surface of the inventive structure casting roll is between 293K and 324K, with a uniform axial distribution. In contrast, the temperature distribution on the inner surface of the roll sleeve 2 in a conventional slotted casting roll structure is between 371K and 405K, and the temperature distribution is uneven along the cooling water path. The temperature distribution at the contact point between the outer surface of the roll sleeve 2 of the present invention and the conventional structure and the molten aluminum is shown below. Figure 7 a, Figure 7 b and Figure 8 As shown, the axial temperature of the present invention is uniform, approximately 370°C, while the axial temperature of the conventional structure fluctuates in the range of 400~450°C. After adopting the structure of the present invention, the temperatures of both the inner and outer surfaces of the casting roll decreased, indicating that the structure of the present invention can increase the cooling effect; moreover, the temperature distribution of the structure of the present invention is more uniform.

[0049] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A cast roll capable of realizing an internal water spray structure, characterized in that, include: Roller sleeve (2), roller core (1) and shaft core (3); The roller core (1) is a hollow I-shaped column and is press-fitted with the roller sleeve (2) to form an annular cavity (8). The roller core (1) is a hollow I-shaped column with a radial through hole (7) that connects the channel (4) and the annular cavity (8); the roller core (1) has a channel (4) for slidingly assembling the shaft core (3) in the axial direction. The shaft core (3) divides the channel (4) into two semicircular channels that are not connected vertically; The shaft core (3) includes a cylindrical shell, a horizontal partition (5), and a cylindrical solid. One end of the horizontal partition (5) passes through the interior of the cylindrical shell and is fixedly connected to the cylindrical shell, while the other end is fixedly connected to the cylindrical solid. The inner diameter of the cylindrical shell and the cylindrical solid, the diameter of the channel (4) and the width of the horizontal partition (5) are the same; Cold water is injected through the semi-circular channel located above and flows into the annular cavity (8) through the radial through hole (7) that connects the channel (4) to the annular cavity (8); When the injected cold water reaches the flow balance, continue to inject cold water into the semi-circular channel located above. The air pressure in the annular cavity (8) increases, causing the cold water to be sprayed through the radial through hole (7) and into the inner surface of the roller sleeve (2) through the annular cavity (8). The cold water sprayed onto the inner surface of the roller sleeve (2) carries away the heat from the inner surface of the roller sleeve (2), flows back through the annular cavity (8) and the radial through hole (7) to the lower semicircular channel, and then the return water is discharged from the casting roll through the lower semicircular channel.

2. The casting roll capable of realizing an internal water spray structure as described in claim 1, characterized in that, The radial through holes (7) are multiple and are evenly distributed on the hollow I-shaped column body.

3. The casting roll capable of realizing an internal water spray structure as described in claim 1, characterized in that, It also includes a support column (6) provided on the column of the hollow I-shaped column of the roller core (1) for supporting the roller sleeve (2).

4. The casting roll capable of realizing an internal water spray structure as described in claim 3, characterized in that, The support columns (6) are multiple and are evenly distributed on the hollow I-shaped column body.

5. A cooling method for a casting roll capable of achieving an internal water spray structure as described in claim 1, characterized in that, include: The shaft core (3) divides the channel (4) of the roller core (1) into two semi-circular channels that are not connected vertically; Cold water is injected through the semi-circular channel located above and flows into the annular cavity (8) through the radial through hole (7) that connects the channel (4) to the annular cavity (8); When the injected cold water reaches the flow balance, continue to inject cold water into the semi-circular channel located above. The air pressure in the annular cavity (8) increases, causing the cold water to be sprayed through the radial through hole (7) and into the inner surface of the roller sleeve (2) through the annular cavity (8). The cold water sprayed onto the inner surface of the roller sleeve (2) carries away the heat from the inner surface of the roller sleeve (2), flows back through the annular cavity (8) and the radial through hole (7) to the lower semicircular channel, and then the return water is discharged from the casting roll through the lower semicircular channel.

6. The cooling method for casting rolls as described in claim 5, characterized in that, The channel (4) that divides the roller core (1) into two non-connected semicircular channels by the shaft core (3) includes: The cylindrical shell and cylindrical body of the shaft core (3) are located at both ends of the channel (4). The cylindrical shell and cylindrical body are connected by the horizontal partition (5) of the shaft core (3), and the channel (4) is divided into an inlet channel and an outlet channel that are not connected vertically. The cylindrical shell, the inner diameter of the cylindrical solid, the diameter of the channel (4), and the width of the horizontal partition (5) are the same.

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