A cooling crystallizer and a manufacturing method thereof

Abstract

The application relates to the field of alloy strip production and discloses a cooling crystallizer and a manufacturing method thereof, which comprises a central shaft body, a heat exchange layer and a pipeline assembly; the central shaft body is provided with a water inlet and a water outlet at two ends along the axial direction of the central shaft body; the heat exchange layer is coaxially sleeved outside the central shaft body and is fixedly connected with the central shaft body; a groove is formed in the outer side wall of the heat exchange layer away from the central shaft body, and a copper sleeve is attached to the outer side wall of the heat exchange layer and seals the groove; the pipeline assembly is used for connecting the water inlet, the groove and the water outlet; wherein, a plurality of pipeline assemblies are arranged; the plurality of pipeline assemblies are arranged in the circumferential direction of the axis of the central shaft body, and the pipeline assemblies are sequentially arranged along the axial direction of the central shaft body to synchronously supply cooling water to different areas in the groove; the application synchronously supplies cooling water to different areas in the groove by arranging a plurality of pipeline assemblies along the axial direction, so that the temperature difference between the two ends of the crystallizer is eliminated, and the forming quality of the strip is more stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of amorphous and nanocrystalline alloy strip production technology, and in particular to a cooling crystallizer and its manufacturing method. Background Technology

[0002] In the preparation of amorphous and nanocrystalline alloy strips, high-temperature alloy melt is sprayed onto the surface of a high-speed rotating cooling roller at extremely high speeds, achieving ultra-fast cooling at the level of millions of degrees Celsius per second. This inhibits crystal nucleation and growth, resulting in amorphous or nanocrystalline structures. The cooling efficiency and uniformity of the cooling roller directly determine the strip's forming quality, thickness uniformity, and ability to form amorphous and nanocrystalline structures. The cooling roller typically consists of an outer copper sleeve and an inner water-cooled shaft. Continuous circulation of cooling water within the shaft removes heat accumulated in the sleeve, thus establishing the quenching conditions required for production.

[0003] However, in existing technologies, traditional cooling roller crystallizers mostly employ a single axial flow pattern. This unidirectional flow field results in a significant temperature gradient along the axial direction on the roller sleeve surface, with a higher temperature at the outlet and a lower temperature at the inlet. With the increasing demand for wide strip materials in high-end applications such as drive motors, this axial temperature unevenness has severely constrained the microstructural uniformity and magnetic performance consistency of the wide strip material. Furthermore, traditional solutions typically require grooves on both the inner surface of the copper sleeve and the outer surface of the shaft to form a closed flow channel. This structure demands extremely high machining precision on the mating surfaces, making it highly susceptible to cooling water leakage due to machining defects. Moreover, the copper sleeve, being a consumable part, needs periodic replacement, and each replacement requires complex flow channel machining of its inner wall, leading to high production and replacement costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to improve the uniformity of the temperature of the cooling roller so as to improve the uniformity of the cooling effect. In order to solve the above technical problem, the present invention provides a cooling crystallizer, including a central shaft, a heat exchange layer and a pipeline assembly. The central shaft is provided with an inlet and an outlet at its two ends along its axial direction. The heat exchange layer is coaxially sleeved on the outside of the central shaft and fixedly connected to the central shaft. The outer wall of the heat exchange layer away from the central shaft has a groove, and a copper sleeve is fitted to the outer wall of the heat exchange layer to close the groove. The pipeline assembly is used to connect the water inlet, the groove and the water outlet; The pipeline assembly is provided in multiple ways, and the multiple pipeline assemblies are arranged circumferentially around the axis of the central shaft. The pipeline assemblies are arranged sequentially along the axial direction of the central shaft so as to synchronously introduce cooling water into different areas within the groove.

[0005] Preferably, a structural layer is provided between the central shaft and the heat exchange layer, the structural layer including a reinforcing rod, the two ends of which are respectively fixedly connected to the outer sidewall of the central shaft and the inner sidewall of the heat exchange layer.

[0006] Preferably, the structural layer further includes an alloy coating layer for wrapping and fixing the pipeline assembly and the reinforcing rod.

[0007] Preferably, the copper sleeve comprises beryllium copper or chromium-zirconium copper; the heat exchange layer comprises a high thermal conductivity copper alloy; and the alloy cladding layer comprises an aluminum alloy.

[0008] Preferably, the piping assembly includes an inlet pipe and an outlet pipe, the inlet pipe being used to connect the inlet to the groove, and the outlet pipe being used to connect the groove to the outlet. The inlet pipe and the outlet pipe are arranged circumferentially around the axis of the central shaft.

[0009] Preferably, the pipeline assembly further includes a plurality of first main pipes and second main pipes, both of which extend along the axial direction of the central shaft. The first main pipe is used to connect the water inlet and the plurality of water inlet pipes, and the second main pipe is used to connect the water outlet and the plurality of water outlet pipes.

[0010] Preferably, multiple grooves are evenly arranged around the outer side wall of the heat exchange layer around the central axis, one groove connects multiple pipe assemblies, and the bottom of one groove is provided with an inlet interface and an outlet interface corresponding to the inlet pipe and the outlet pipe, respectively. The water inlet and the water outlet are alternately arranged around the axis of the central shaft.

[0011] Preferably, the cross-sectional shape of the water inlet pipe is circular, elliptical, or rectangular; The cross-sectional shape of the water outlet pipe is circular, elliptical, or rectangular.

[0012] Preferably, the copper sleeve and the heat exchange layer are press-fitted after heat treatment.

[0013] The present invention also provides a method for manufacturing a cooling crystallizer, comprising the following steps: S1. Machining and forming of the central shaft, heat exchange layer, piping assembly, copper sleeve and reinforcing rod; S2. The central shaft and the heat exchange layer are fixedly connected by a reinforcing rod, and a pipeline assembly is fixedly installed between the central shaft and the heat exchange layer so that the water inlet and outlet of the central shaft are connected to the groove on the outer wall of the heat exchange layer. S3. The central shaft and heat exchange layer are preheated to 200 to 600 degrees Celsius by electromagnetic induction heating, and then the molten aluminum alloy is poured between the central shaft and the heat exchange layer for solidification. S4. Heat the copper sleeve and nest the copper sleeve into the outer wall of the heat exchange layer so that the copper sleeve and the heat exchange layer are interference fit.

[0014] Compared with the prior art, the cooling crystallizer and manufacturing method provided in this embodiment of the invention have the following advantages: In this invention, by setting a groove on the outer wall of the heat exchange layer, and then arranging multiple pipeline components sequentially along the axial direction of the central shaft, cooling water can be supplied to different areas along the axial direction of the groove simultaneously, thereby ensuring the temperature uniformity of the groove and the temperature uniformity of the copper sleeve in the axial direction. This improves the uniformity and stability of the cooling effect on the strip, and avoids temperature differences in the strip in the axial direction, which would affect the forming quality of the strip. Attached Figure Description

[0015] Figure 1 This is a perspective view of the internal structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a cross-sectional view of the internal structure of the present invention; Figure 4 This is a front view of the internal structure of the present invention; Figure 5 This is the present invention. Figure 4 A partial structural diagram.

[0016] In the diagram: 1. Central shaft; 11. Inlet; 12. Outlet; 2. Heat exchange layer; 21. Groove; 22. Water inlet; 23. Water outlet; 3. Piping components; 31. Inlet pipe; 32. Outlet pipe; 33. First main pipe; 34. Second main pipe; 4. Copper sleeve; 5. Structural layer; 51. Reinforcing rod; 52. Alloy coating layer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, and are not used to describe a particular order, hierarchy, or importance of components.

[0019] It should be noted that, unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / device / apparatus is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention. Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, positioned in a specific orientation such as "horizontal," "vertical," or "suspended," can have an error / deviation of ±10% relative to that orientation, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still fulfill its function in the present invention.

[0020] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0023] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0024] like Figures 1 to 3 As shown, a preferred embodiment of the present invention provides a cooling crystallizer, which includes a central shaft 1, a heat exchange layer 2, and a pipeline assembly 3; The central shaft 1 has an inlet 11 and an outlet 12 at its two ends extending along its axial direction, respectively. The heat exchange layer 2 is coaxially sleeved on the outside of the central shaft 1 and fixedly connected to the central shaft 1. The outer wall of the heat exchange layer 2 away from the central shaft 1 has a groove 21, and a copper sleeve 4 is attached to the outer wall of the heat exchange layer 2, which closes the groove 21. Piping assembly 3 is used to connect the inlet 11, the groove 21 and the outlet 12; The pipeline assembly 3 is provided in multiple ways, and the multiple pipeline assemblies 3 are arranged circumferentially around the axis of the central shaft 1. The pipeline assemblies 3 are arranged sequentially along the axis of the central shaft 1 so as to synchronously introduce cooling water into different areas within the groove 21.

[0025] Specifically, in the traditional scheme, the cooling water flows directly along the axial direction of the central shaft 1. This results in a temperature difference on the outer wall of the crystallizer along the axial direction of the central shaft 1. The outer wall near the inlet 11 has a better cooling effect, while the outer wall near the outlet 12 has a poorer cooling effect due to the increased temperature of the cooling water. This leads to inconsistent cooling effects at both ends of the strip width, resulting in inconsistent solidification rates in the strip width direction, which seriously affects the overall quality of the strip.

[0026] In this embodiment, multiple pipeline components 3 are additionally provided. The pipeline components 3 are arranged circumferentially around the axis of the central shaft 1 and also extend along the axial direction of the central shaft 1. This allows cooling water to be supplied to different areas within the groove 21 simultaneously in the circumferential direction and in the axial direction. In other words, the multiple pipeline components 3 enable cooling water to be delivered to different areas of the groove 21 simultaneously, thereby avoiding the temperature difference problem that easily occurs between different areas of the groove 21 in the traditional solution. Ultimately, this ensures the stability of the cooling effect on the strip, and the amorphous quality of the strip is more uniform, stable, and reliable.

[0027] Furthermore, in this embodiment, the groove 21 is only formed on the heat exchange layer 2, and then the groove 21 is sealed by covering the outer wall of the heat exchange layer 2 with a copper sleeve 4. When replacement is required, only the copper sleeve 4 needs to be replaced, without the need for additional machining, which greatly reduces the production cost and maintenance cost of the entire crystallizer.

[0028] In some embodiments, a structural layer 5 is provided between the central shaft 1 and the heat exchange layer 2. The structural layer 5 includes a reinforcing rod 51, and the two ends of the reinforcing rod 51 are respectively fixedly connected to the outer side wall of the central shaft 1 and the inner side wall of the heat exchange layer 2.

[0029] Specifically, since the entire crystallizer needs to rotate at high speed to meet the production requirements of strip, simply connecting the central shaft 1 and the heat exchange layer 2 through the pipe body in the pipeline assembly 3 has insufficient structural strength. Under high-speed rotation, the pipe body in the pipeline assembly 3 is prone to breakage. Therefore, in this embodiment, a structural layer 5 is also provided. The structural layer 5 is used to connect the heat exchange layer 2 and the central shaft 1 and improve the connection strength between the two to meet the needs of high-speed rotation of the crystallizer. The reinforcing rod 51 can be made of high-strength alloy material. The reinforcing rod 51 can be fixedly connected to the heat exchange layer 2 and the central shaft 1 through a threaded structure or a snap-fit ​​structure.

[0030] like Figure 2 As shown, in some embodiments, the structural layer 5 further includes an alloy wrapping layer 52, which is used to wrap and fix the pipeline assembly 3 and the reinforcing rod 51.

[0031] Specifically, in addition to the reinforcing rod 51, the structural layer 5 also includes an alloy coating layer 52 in some embodiments. In actual production, the connected central shaft 1, pipeline assembly 3 and heat exchange layer 2 are placed into a special mold, and then molten alloy material is poured into the mold. After the alloy solidifies, a complete alloy coating layer 52 is formed. The alloy coating layer 52 completely fills the blank area between the heat exchange layer 2 and the central shaft 1, thereby making the heat exchange layer 2 and the central shaft 1 a whole, and its strength is greatly improved.

[0032] It should be noted that the alloy coating layer 52 is preferably made of an alloy material with high thermal conductivity, low melting point and low density.

[0033] Furthermore, the copper sleeve 4 comprises beryllium copper or chromium-zirconium copper; the heat exchange layer 2 comprises a high thermal conductivity copper alloy; and the alloy cladding layer 52 comprises an aluminum alloy. Aluminum alloy is lighter for the same volume and has a mature and low-cost casting process, therefore aluminum alloy is the preferred material for the alloy cladding layer 52. The use of copper alloy for the heat exchange layer 2, along with the outermost copper sleeve 4 structure, improves thermal conductivity while ensuring structural strength and service life.

[0034] like Figure 4 and Figure 5 As shown, in some embodiments, the piping assembly 3 includes an inlet pipe 31 and an outlet pipe 32. The inlet pipe 31 is used to connect the inlet 11 and the groove 21, and the outlet pipe 32 is used to connect the groove 21 and the outlet 12. The inlet pipe 31 and the outlet pipe 32 are arranged circumferentially around the axis of the central shaft 1.

[0035] In this embodiment, one end of each water inlet pipe 31 is directly connected to the central shaft 1 through the corresponding water inlet 11, and the other end is connected to the groove 21, so that cooling water can be supplied to different areas in the groove 21 at the same time; one end of each water outlet pipe 32 is directly connected to the central shaft 1 through the water outlet 12, and the other end is connected to the groove 21, so that after absorbing heat, the cooling water will be quickly discharged from the water outlet pipe 32 to the water outlet 12 of the central shaft 1.

[0036] It should be noted that the number of water inlet pipes 31 in this embodiment can be adjusted according to actual needs, and is not specifically limited here. Similarly, the number of water outlet pipes 32 can be adjusted according to actual needs.

[0037] Furthermore, the cross-sectional shape of the inlet pipe 31 is circular, elliptical, or rectangular; the cross-sectional shape of the outlet pipe 32 is circular, elliptical, or rectangular. Understandably, in this embodiment, the cross-sectional shape of the inlet pipe 31 refers to its radial cross-sectional shape, and the cross-sectional shape of the outlet pipe 32 refers to its radial cross-sectional shape, so that the inlet pipe 31 and outlet pipe 32 in this embodiment can be selected according to actual needs, without any particular limitation.

[0038] Furthermore, in some embodiments, the inlet pipe 31 and the outlet pipe 32 are not directly connected to the central shaft 1. In this case, the pipeline assembly 3 also includes multiple first main pipes 33 and second main pipes 34. Both the first main pipes 33 and the second main pipes 34 extend along the axial direction of the central shaft 1. The first main pipe 33 is used to connect the inlet 11 and multiple inlet pipes 31, and the second main pipe 34 is used to connect the outlet 12 and multiple outlet pipes 32.

[0039] Specifically, in this embodiment, the first main pipe 33 extends along the axial direction of the central shaft 1 and is connected to multiple water inlet pipes 31. This allows the cooling water input from the water inlet 11 to be distributed through the first main pipe 33 and simultaneously enter different water inlet pipes 31 arranged sequentially along the axial direction. This enables the cooling water to be supplied to different areas in the groove 21 simultaneously, avoiding temperature differences and ensuring the consistency of the solidification environment in the width direction of the strip. This results in better, more balanced and stable amorphous quality of the strip.

[0040] In some embodiments, multiple grooves 21 are uniformly arranged around the axis of the central shaft 1 on the outer side wall of the heat exchange layer 2. One groove 21 connects multiple pipe assemblies 3. The bottom of one groove 21 is provided with an inlet port 22 and an outlet port 23 corresponding to the inlet pipe 31 and the outlet pipe 32, respectively. The inlet port 22 and the outlet port 23 are alternately arranged around the axis of the central shaft 1.

[0041] In this embodiment, multiple grooves 21 are uniformly formed on the outer wall of the heat exchange layer 2 around the axis of the central shaft 1. Each groove 21 is connected to the water inlet 11 and water outlet 12 of the central shaft 1 through a pipe assembly 3. This makes it easier for the interior of the groove 21 to be filled with cooling water, and the circulation of cooling water is faster and more stable, resulting in a more stable and reliable cooling effect. The groove 21 has an arc-shaped structure, and the water inlet interface 22 and water outlet interface 23 connecting the water inlet pipe 31 and water outlet pipe 32 in the same pipe assembly 3 are arranged along the curvature of the arc-shaped surface of the groove 21. When cooling water is introduced into the groove 21 through the water inlet pipe 31, the water flows circumferentially within the groove 21, so that after absorbing heat, the cooling water is quickly discharged from the adjacent water outlet pipe 32 to the water outlet 12 of the central shaft 1, which accelerates the circulation speed of the cooling water and further improves the cooling and solidification effect.

[0042] In some embodiments, the copper sleeve 4 and the heat exchange layer 2 are press-fitted after heat treatment. Specifically, in this embodiment, the copper sleeve 4 is preheated and fitted onto the outer wall of the heat exchange layer 2. Then, the copper sleeve 4 cools and shrinks, thereby achieving a press-fit between the copper sleeve 4 and the heat exchange layer 2. The copper sleeve 4 is firmly clamped onto the outer wall of the heat exchange layer 2, achieving a seal on the groove 21. Compared with the traditional solution, this avoids the trouble of machining the groove 21 on the copper sleeve 4, and also achieves a better sealing effect. In subsequent maintenance and repair, the copper sleeve 4 can be directly disconnected for replacement, thus reducing the production and maintenance costs of the entire crystallizer. Of course, in some alternative embodiments, the copper sleeve 4 is fixed between the outer walls of the heat exchange layer 2, and welding or other sealing structures can be added to the sides of the copper sleeve 4 to further improve the stability and reliability of the seal of the groove 21.

[0043] The present invention also provides a method for manufacturing a cooling crystallizer, comprising the following steps: S1, machined and formed central shaft 1, heat exchange layer 2, pipeline assembly 3, copper sleeve 4 and reinforcing rod 51; S2. The central shaft 1 and the heat exchange layer 2 are fixedly connected by the reinforcing rod 51, and the pipeline assembly 3 is fixedly installed between the central shaft 1 and the heat exchange layer 2, so that the water inlet 11 and water outlet 12 of the central shaft 1 are connected to the groove 21 on the outer wall of the heat exchange layer 2. S3. The central shaft 1 and the heat exchange layer 2 are preheated to 200 degrees Celsius to 600 degrees Celsius by electromagnetic induction heating, and then the molten aluminum alloy is poured between the central shaft 1 and the heat exchange layer 2 for solidification. Preferably, the central shaft 1 and the heat exchange layer 2 are preheated to 300 degrees Celsius to 500 degrees Celsius by electromagnetic induction heating.

[0044] S4. Heat the copper sleeve 4 and nest the copper sleeve 4 into the outer wall of the heat exchange layer 2 so that the copper sleeve 4 and the heat exchange layer 2 are interference fit.

[0045] Specifically, in the manufacturing process of the crystallizer in this embodiment, the inlet 11 and outlet 12 of the central shaft 1, the through holes connecting the first main pipe 33 and the second main pipe 34, and the threaded hole structure corresponding to the reinforcing rod 51 need to be machined first. Then, the groove 21, the threaded hole structure corresponding to the reinforcing rod 51, and the corresponding inlet interface 22 and outlet interface 23 are machined on the heat exchange layer 2. Finally, the copper sleeve 4, the inlet pipe 31, the outlet pipe 32, and the reinforcing rod 51 are machined. Subsequently, the reinforcing rod 51, the inlet pipe 31, the outlet pipe 32, the central shaft 1, and the heat exchange layer 2 are connected together, and a continuity test is conducted to ensure that the cooling water input through the inlet 11 of the central shaft 1 can be stably input into the groove 21 through the inlet pipe 31. Water is introduced through outlet pipe 32 to outlet 12 to ensure that there is no leakage of cooling water between pipeline assembly 3, central shaft 1, and heat exchange layer 2. Then, central shaft 1 and heat exchange layer 2 are heated to a preset temperature, which needs to be slightly lower than the melting point of alloy coating layer 52. Then, central shaft 1 and heat exchange layer 2 are placed into a pre-made mold, and molten aluminum alloy is poured between central shaft 1 and heat exchange layer 2. After the aluminum alloy solidifies, it can wrap the entire pipeline assembly 3 and reinforcing rod 51, improving the connection strength between heat exchange layer 2 and central shaft 1. Finally, copper sleeve 4 is heated and nested into the outer wall of heat exchange layer 2. After copper sleeve 4 cools, the interference fit between copper sleeve 4 and heat exchange layer 2 is completed.

[0046] In summary, this embodiment of the invention provides a cooling crystallizer that, through multiple pipeline assemblies 3 arranged sequentially along the central shaft 1, enables the synchronous supply of cooling water to different areas of the groove 21, avoiding temperature differences in the strip width direction and ensuring temperature uniformity and stability throughout the strip forming process, thereby improving the forming quality of the strip. Furthermore, the heat exchange layer 2 and the copper sleeve 4 simplify the crystallizer's production process, avoiding the hassle of creating grooves 21 on the copper sleeve 4, reducing production costs, and facilitating easier replacement of the copper sleeve 4 during subsequent maintenance, resulting in lower maintenance costs.

[0047] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A cooling crystallizer, characterized in that, include: A central shaft, with an inlet and an outlet respectively provided at both ends extending along its axial direction; A heat exchange layer is coaxially sleeved on the outside of the central shaft and fixedly connected to the central shaft. A groove is formed on the outer side wall of the heat exchange layer away from the central shaft, and a copper sleeve is fitted on the outer side wall of the heat exchange layer to close the groove. A piping assembly for connecting the inlet, the groove, and the outlet; The pipeline assembly is provided in multiple ways, and the multiple pipeline assemblies are arranged circumferentially around the axis of the central shaft. The pipeline assemblies are arranged sequentially along the axial direction of the central shaft so as to synchronously introduce cooling water into different areas within the groove.

2. The cooling crystallizer according to claim 1, characterized in that, A structural layer is provided between the central shaft and the heat exchange layer. The structural layer includes a reinforcing rod, and the two ends of the reinforcing rod are respectively fixedly connected to the outer side wall of the central shaft and the inner side wall of the heat exchange layer.

3. The cooling crystallizer according to claim 2, characterized in that, The structural layer also includes an alloy coating layer, which is used to wrap and fix the pipeline assembly and the reinforcing rod.

4. The cooling crystallizer according to claim 3, characterized in that, The copper sleeve comprises beryllium copper or chromium-zirconium copper; the heat exchange layer comprises a high thermal conductivity copper alloy; and the alloy coating layer comprises an aluminum alloy.

5. The cooling crystallizer according to claim 1, characterized in that, The pipeline assembly includes an inlet pipe and an outlet pipe. The inlet pipe is used to connect the inlet to the groove, and the outlet pipe is used to connect the groove to the outlet. The inlet pipe and the outlet pipe are arranged circumferentially around the axis of the central shaft.

6. The cooling crystallizer according to claim 5, characterized in that, The pipeline assembly also includes a plurality of first main pipes and second main pipes, both of which extend along the axial direction of the central shaft. The plurality of first main pipes are connected to connect the water inlet and the plurality of water inlet pipes, and the plurality of second main pipes are connected to connect the water outlet and the plurality of water outlet pipes.

7. The cooling crystallizer according to claim 6, characterized in that, Multiple grooves are evenly arranged around the outer wall of the heat exchange layer around the central axis. One groove connects multiple pipe assemblies. The bottom of one groove is provided with an inlet port and an outlet port corresponding to the inlet pipe and the outlet pipe, respectively. The water inlet and the water outlet are alternately arranged around the axis of the central shaft.

8. The cooling crystallizer according to claim 5, characterized in that, The cross-sectional shape of the water inlet pipe is circular, elliptical, or rectangular; The cross-sectional shape of the water outlet pipe is circular, elliptical, or rectangular.

9. The cooling crystallizer according to claim 1, characterized in that, The copper sleeve and the heat exchange layer are press-fitted after heat treatment.

10. A method for manufacturing a cooling crystallizer, characterized in that, Includes the following steps: S1. Machining and forming of the central shaft, heat exchange layer, piping assembly, copper sleeve and reinforcing rod; S2. The central shaft and the heat exchange layer are fixedly connected by a reinforcing rod, and a pipeline assembly is fixedly installed between the central shaft and the heat exchange layer so that the water inlet and outlet of the central shaft are connected to the groove on the outer wall of the heat exchange layer. S3. The central shaft and heat exchange layer are preheated to 200 to 600 degrees Celsius by electromagnetic induction heating, and then the molten aluminum alloy is poured between the central shaft and the heat exchange layer for solidification. S4. Heat the copper sleeve and nest the copper sleeve into the outer wall of the heat exchange layer so that the copper sleeve and the heat exchange layer are interference fit.

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