Aluminum alloy semi-continuous casting device

Abstract

The utility model provides an aluminum alloy semi-continuous casting device which comprises a launder, a graphite ring, a crystallizer, an electromagnetic stirring unit, an ultrasonic vibration unit and a dummy bar head. The tail end of the launder is communicated with a cavity of the crystallizer so as to lead in aluminum alloy melt, and the graphite ring is arranged on the inner wall of a first water tank of the crystallizer; the dummy bar head is arranged below the graphite ring and moves up and down in the direction of the center axis of the crystallizer. The ultrasonic vibration unit extends into the cavity of the crystallizer to act on the aluminum alloy melt; the electromagnetic stirring unit comprises a plurality of electromagnetic generators and a plurality of second water tanks, the cross sections of the electromagnetic generators are annular, and each electromagnetic generator is arranged in the corresponding second water tank; a second water tank is arranged on the peripheral side of the first water tank of the crystallizer, and a plurality of second water tanks are sequentially arranged below the first water tank of the crystallizer. The action range of an external field in the aluminum alloy melt can be expanded to the maximum extent, the heat transfer efficiency is improved, and the probability of generation of hot cracks is reduced.

Description

Technical Field

[0001] This utility model relates to the field of aluminum alloy casting technology, and in particular to an aluminum alloy semi-continuous casting device. Background Technology

[0002] As a lightweight structural material, 7xxx aluminum alloys are widely used in aerospace, transportation, and other fields due to their low density, high strength, and fatigue resistance. In recent years, with the continuous advancement of lightweighting trends in related fields and the increasing demands on material performance, 7xxx aluminum alloys have gradually developed towards higher alloying levels, with the content of main alloying elements continuously increasing.

[0003] Currently, semi-continuous casting is the main method for preparing aluminum alloy ingots. This method involves injecting molten aluminum alloy through a flow channel into a crystallizer made of a material with good thermal conductivity. Upon contact with the crystallizer wall, the molten metal rapidly forms a solidified shell. The solidified shell is then pulled out by a sprue head, and a large amount of cooling water is immediately sprayed from below the crystallizer for rapid cooling and shaping. Although semi-continuous casting is widely used in the aluminum processing industry, as ingot sizes increase, the difference in solidification conditions between the surface and core increases, leading to greater inhomogeneity in the solidification structure and chemical composition. Simultaneously, the inhomogeneity of the temperature field increases solidification thermal stress, and high alloying causes a large amount of brittle second phase to accumulate at grain boundaries, weakening the grain boundaries and drastically increasing the risk of cracking during the liquid solidification process of the ingot. Utility Model Content

[0004] This invention provides a semi-continuous aluminum alloy casting device to solve the technical problem of high cracking risk during the cooling and forming of aluminum alloy ingots in the prior art.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] In a first aspect, this utility model provides a semi-continuous aluminum alloy casting apparatus, comprising a flow channel, a graphite ring, a crystallizer, an electromagnetic stirring unit, an ultrasonic vibration unit, and a siphon head. The crystallizer has a cavity. The end of the flow channel communicates with the cavity of the crystallizer to introduce molten aluminum alloy. The graphite ring is disposed on the inner wall of a first water tank of the crystallizer. The siphon head is disposed below the graphite ring and moves up and down along the central axis of the crystallizer. The ultrasonic vibration unit extends into the cavity of the crystallizer to act on the molten aluminum alloy. The electromagnetic stirring unit includes multiple electromagnetic generators and multiple second water tanks. The cross-section of the electromagnetic generator is annular, and each electromagnetic generator is disposed in a second water tank. A second water tank is disposed on the outer periphery of the first water tank of the crystallizer, and multiple second water tanks are sequentially disposed below the first water tank of the crystallizer.

[0007] Furthermore, the central axis of the plurality of electromagnetic generators coincides with the central axis of the crystallizer.

[0008] Furthermore, the current directions in two adjacent electromagnetic generators are opposite.

[0009] Furthermore, the electromagnetic generator includes a silicon steel yoke and a coil. The silicon steel yoke is annular, and the inner wall of the silicon steel yoke is provided with multiple ribs, with the coil wound around each rib.

[0010] Furthermore, the electromagnetic stirring unit also includes a connecting rod, a partition plate, and a support plate. The upper end of the connecting rod is fixed to the base of the crystallizer. Multiple support plates are provided on the connecting rod, and a second water tank is hung below each support plate. An electromagnetic generator is placed in each second water tank. Multiple partition plates are provided on the connecting rod, and a partition plate is provided between each second water tank to isolate two adjacent electromagnetic generators.

[0011] Furthermore, the support plate and the partition plate are movably mounted on the connecting rod.

[0012] Furthermore, the second water tank includes a tank body and a baffle. The tank body is provided with an inlet and an outlet, and the baffle is disposed inside the tank body to separate the inlet and the outlet.

[0013] Furthermore, the cross-section of the box is annular, and the water inlet is located on the outer periphery of the box; there are multiple water outlets, which are arranged along the inner periphery of the box.

[0014] Furthermore, the ultrasonic vibration unit includes a horizontal adjustment unit, a vertical adjustment unit, and multiple ultrasonic rods. The horizontal adjustment unit is disposed above the crystallizer, and the vertical adjustment unit supports the horizontal adjustment unit to adjust its position. One end of each ultrasonic rod is mounted on the horizontal adjustment unit and can move along the horizontal adjustment unit, while the other end extends into the molten aluminum alloy.

[0015] Furthermore, the horizontal adjustment unit includes a first frame, a second frame, and tracks. The first frame is located on the outer periphery of the second frame and is mounted on the vertical adjustment unit. Multiple tracks are installed between the first frame and the second frame, and each track is equipped with an ultrasonic rod that slides on the track. An ultrasonic rod is installed inside the second frame and is engaged with the second frame.

[0016] Furthermore, the multiple tracks are arranged radially from the second frame to the first frame.

[0017] The semi-continuous aluminum alloy casting apparatus provided by this utility model introduces ultrasonic waves into the molten aluminum alloy while using an electromagnetic stirring unit to stir the molten aluminum alloy. The electromagnetic stirring unit is equipped with multiple annular electromagnetic generators, each of which is placed in a second water tank. One second water tank is positioned on the outer periphery of the first water tank in the crystallizer, and the other second water tanks are sequentially positioned below the first water tank. This semi-continuous aluminum alloy casting apparatus can refine the surface grains through electromagnetic stirring and break up the core grains through ultrasonic cavitation. The combination of a multi-position, multi-source electromagnetic stirring unit and an ultrasonic vibration unit maximizes the range of influence of the external field within the molten aluminum alloy, generating forced convection, increasing heat transfer efficiency, reducing the temperature and temperature gradient of the melt, and ultimately forming a uniform temperature field, thus reducing the probability of hot cracking. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the aluminum alloy semi-continuous casting device in this embodiment of the present invention;

[0020] Figure 2 This is a top view of the electromagnetic generator in an embodiment of this utility model;

[0021] Figure 3 This is a top view of the ultrasonic vibration unit in an embodiment of the present invention.

[0022] Figure label:

[0023] 1. Smelting furnace; 2. Molten aluminum alloy; 3. Flow channel; 4. Hot top; 5. Graphite ring;

[0024] 6. Crystallizer; 61. Base; 62. First water tank;

[0025] 7. Electromagnetic stirring unit; 71. Connecting rod; 72. Support plate; 73. Second water tank; 74. Electromagnetic generator; 741. Silicon steel magnetic yoke; 742. Coil; 75. Partition plate;

[0026] 8. Ultrasonic vibration unit; 81. Vertical adjustment unit; 821. First frame; 822. Second frame; 823. Track; 824. Ultrasonic rod;

[0027] 9. Ingot; 10. Drawer head; 11. Ground. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0032] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0033] Reference Figure 1This application provides a semi-continuous aluminum alloy casting device, including a flow channel 3, a graphite ring 5, a crystallizer 6, an electromagnetic stirring unit 7, an ultrasonic vibration unit 8, and a dummy head 10. The crystallizer 6 has a cavity. The end of the flow channel 3 communicates with the cavity of the crystallizer 6 to introduce aluminum alloy melt 2. The graphite ring 5 is disposed on the inner wall of the first water tank 62 of the crystallizer 6. The dummy head 10 is disposed below the graphite ring 5 and moves up and down along the central axis of the crystallizer 6. The ultrasonic vibration unit 8 extends into the cavity of the crystallizer 6 to act on the aluminum alloy melt 2. The electromagnetic stirring unit 7 includes multiple electromagnetic generators 74 and multiple second water tanks 73. The cross-section of the electromagnetic generators 74 is annular, and each electromagnetic generator 74 is disposed in a second water tank 73. A second water tank 73 is disposed on the outer periphery of the first water tank 62 of the crystallizer 6, and multiple second water tanks 73 are disposed sequentially below the first water tank 62 of the crystallizer 6.

[0034] In this embodiment, the base 61 of the crystallizer 6 is fixed to the ground 11. The first water tank 62 of the crystallizer 6 is located below the ground 11. The molten aluminum alloy 2 formed in the melting furnace 1 is introduced into the cavity of the crystallizer 6 through the flow channel 3; a hot top 4 can be provided above the crystallizer 6 to prevent the molten aluminum alloy 2 from entering the outside of the cavity. The diameter of the cavity of the crystallizer 6 is between 100 and 1500 mm. A graphite ring 5 is provided on the inner wall of the first water tank 62 of the crystallizer 6. The ingot head 10 is below the graphite ring 5 and can move up and down along the central axis of the crystallizer 6. Before the molten aluminum alloy 2 is injected into the crystallizer 6, the ingot head 10 is raised into the crystallizer 6 to prevent aluminum leakage when the molten aluminum alloy 2 enters the crystallizer 6. An ultrasonic vibration unit 8 extends into the molten aluminum alloy 2 to act on it.

[0035] In this embodiment, the electromagnetic stirring unit 7 is equipped with multiple annular electromagnetic generators 74, and each electromagnetic generator 74 is respectively placed in a second water tank 73. One second water tank 73 is located on the outer periphery of the first water tank 62 of the crystallizer 6, and the other second water tanks 73 are sequentially arranged below the first water tank 62. That is, multiple positions and multiple sources of electromagnetic generators 74 are arranged around the aluminum alloy melt 2, and the electromagnetic generators 74 are as close as possible to the aluminum alloy melt 2. Further, the central axis of the multiple electromagnetic generators 74 coincides with the central axis of the crystallizer 6. Specifically, the number of electromagnetic generators 74 is four.

[0036] The semi-continuous aluminum alloy casting apparatus of this application embodiment can refine the surface grains through electromagnetic stirring and break the core grains through ultrasonic cavitation. By setting up a multi-position multi-source electromagnetic stirring unit 7 and combining it with an ultrasonic vibration unit 8, the range of influence of the external field within the aluminum alloy melt 2 can be maximized, generating forced convection in the aluminum alloy melt 2, increasing heat transfer efficiency, thereby reducing the temperature and temperature gradient of the melt, and ultimately forming a uniform temperature field, reducing the probability of hot cracking.

[0037] Furthermore, the current directions in adjacent electromagnetic generators 74 are opposite. In this embodiment, the opposite current directions in adjacent electromagnetic generators 74 can create strong shear in the aluminum alloy melt 2, breaking dendrites, increasing solidification nucleation points, and refining the grain size.

[0038] In some embodiments, the electromagnetic generator 74 includes a silicon steel yoke 741 and a coil 742. The silicon steel yoke 741 is annular, and its inner wall has multiple ribs, with the coil 742 wound around each rib. (See reference...) Figure 2 The inner wall of the annular silicon steel magnetic yoke 741 is provided with multiple ribs, which can be evenly distributed. The coil 742 is wound on the ribs, with 50 to 200 turns of the coil 742 on each rib. Both the silicon steel magnetic yoke 741 and the coil 742 are placed in the second water tank 73 for cooling.

[0039] In this embodiment, coil 742 is connected to a control power supply with the following parameters: current 0–200A and frequency 5–100Hz. Each coil 742 is supplied with an alternating current with a phase difference of 2π / 3. Specifically, taking a silicon steel magnetic yoke 741 with six ribs on its inner wall as an example, the coils 742 on the ribs are labeled A, B, C, D, E, and F, respectively, with opposite current directions in adjacent coils 742. The current in each electromagnetic generator 74 coil 742 is set as follows, where I represents the peak value of the three-phase alternating current, f represents the frequency of the three-phase alternating current, and t represents time.

[0040] Electromagnetic generator 74 on the outer periphery of the first water tank 62 of crystallizer 6:

[0041] I A1 =Isin(2πft)

[0042] I B1 =Isin(2πft+2π / 3)

[0043] I C1 =Isin(2πft+4π / 3)

[0044] I D1 =Isin(2πft)

[0045] IE1 =Isin(2πft+2π / 3)

[0046] I F1 =Isin(2πft+4π / 3)

[0047] The first electromagnetic generator 74 below crystallizer 6:

[0048] I A2 =-Isin(2πft)

[0049] I B2 =-Isin(2πft+2π / 3)

[0050] I C2 =-Isin(2πft+4π / 3)

[0051] I D2 =-Isin(2πft)

[0052] I E2 =-Isin(2πft+2π / 3)

[0053] I F2 =-Isin(2πft+4π / 3)

[0054] The second electromagnetic generator 74 below crystallizer 6:

[0055] I A3 =Isin(2πft)

[0056] I B3 =Isin(2πft+2π / 3)

[0057] I C3 =Isin(2πft+4π / 3)

[0058] I D3 =Isin(2πft)

[0059] I E3 =Isin(2πft+2π / 3)

[0060] I F3 =Isin(2πft+4π / 3)

[0061] The third electromagnetic generator 74 below crystallizer 6:

[0062] I A4 =-Isin(2πft)

[0063] I B4 =-Isin(2πft+2π / 3)

[0064] I C4 =-Isin(2πft+4π / 3)

[0065] I D4 =-Isin(2πft)

[0066] I E4 =-Isin(2πft+2π / 3)

[0067] I F4 =-Isin(2πft+4π / 3)

[0068] In some embodiments, the electromagnetic stirring unit 7 further includes a connecting rod 71, a partition plate 75, and a support plate 72. The upper end of the connecting rod 71 is fixed to the base 61 of the crystallizer 6. Multiple support plates 72 are provided on the connecting rod 71, and a second water tank 73 is hung below each support plate 72. An electromagnetic generator 74 is placed in each second water tank 73. Multiple partition plates 75 are provided on the connecting rod 71, and a partition plate 75 is provided between each second water tank 73 to isolate two adjacent electromagnetic generators 74.

[0069] In this embodiment, the second water tank 73 is mounted on the connecting rod 71 via a support plate 72 for easy fixation. An electromagnetic generator 74 is placed inside the second water tank 73. The currents in the coils 742 of two adjacent electromagnetic generators 74 flow in opposite directions, thereby creating strong shear in the molten aluminum alloy 2. A partition 75 is provided between each second water tank 73 to separate adjacent electromagnetic generators 74 and prevent mutual interference. The partition 75 is made of copper. The support plate 72 can be made of iron.

[0070] Furthermore, the support plate 72 and the partition plate 75 are movably mounted on the connecting rod 71. (Refer to...) Figure 1 The support plate 72 can move up and down on the connecting rod 71, thereby adjusting the position of the second water tank 73 on the support plate 72, that is, adjusting the position of the electromagnetic generator 74, so as to realize the controllable adjustment of the stirring area.

[0071] In some embodiments, the second water tank 73 includes a tank body and a baffle. The tank body is provided with an inlet and an outlet, and the baffle is disposed inside the tank body to separate the inlet and the outlet. In this embodiment, the tank body is provided with an inlet and an outlet for cooling water, and the cooling water discharged from the outlet cools the ingot 9. The baffle is disposed inside the tank body to increase the residence time of the cooling water inside the tank body.

[0072] Furthermore, the box body has an annular cross-section, with the water inlet located on the outer periphery of the box body; there are multiple water outlets, arranged along the inner periphery of the box body. In this embodiment, the box body can be configured with the same shape as the electromagnetic generator 74, i.e., an annular cross-section. Multiple water outlets are arranged on the inner periphery of the box body for spraying cooling water onto the ingot 9 for cooling. The water outlets are evenly distributed on the inner periphery of the box body.

[0073] In this embodiment, the first water tank 62 of the crystallizer 6 has a similar or identical structure to the second water tank 73 described above. The first water tank 62 is provided with an inlet and an outlet, and a baffle is installed inside to increase the residence time of the water flow within the first water tank 62. Cooling water is sprayed out from the outlet to cool the ingot 9.

[0074] In some embodiments, the ultrasonic vibration unit 8 includes a horizontal adjustment unit, a vertical adjustment unit 81, and a plurality of ultrasonic rods 824. The horizontal adjustment unit is disposed above the crystallizer 6, and the vertical adjustment unit 81 supports the horizontal adjustment unit to adjust its position. One end of the ultrasonic rod 824 is mounted on the horizontal adjustment unit and can move along the horizontal adjustment unit, while the other end extends into the aluminum alloy melt 2.

[0075] In this embodiment of the application, reference is made to 1. Figure 3 The horizontal adjustment unit is supported on the vertical adjustment unit 81 and can adjust its position on the vertical adjustment unit 81, thereby adjusting the height of the ultrasonic rod 824. The horizontal adjustment unit is located above the cavity of the crystallizer 6 to allow the ultrasonic rod 824 to extend into the aluminum alloy melt 2. The upper end of the ultrasonic rod 824 is mounted on the horizontal adjustment unit and can move on the horizontal adjustment unit, thereby adjusting the position of the ultrasonic rod 824 in the aluminum alloy melt 2. The upper end of the ultrasonic rod 824 is connected to an ultrasonic control power supply with the following parameters: power 500-5000W, frequency 20-100KHz.

[0076] Specifically, refer to Figure 3 The horizontal adjustment unit includes a first frame 821, a second frame 822, and a track 823. The first frame 821 is located on the outer periphery of the second frame 822 and is mounted on the vertical adjustment unit 81. Multiple tracks 823 are installed between the first frame 821 and the second frame 822. Each track 823 is equipped with an ultrasonic rod 824, and the ultrasonic rod 824 slides on the track 823. An ultrasonic rod 824 is installed inside the second frame 822 and is engaged with the second frame 822.

[0077] In this embodiment, the vertical adjustment unit 81 supports the first frame 821. The vertical adjustment unit 81 may include multiple vertical rods and support rods. The support rods are fixed to the first frame 821, the vertical rods support the support rods, and the support rods can move up and down on the vertical rods to adjust the position of the horizontal adjustment unit in the vertical direction, thereby adjusting the depth of the ultrasonic rod 824 in the aluminum alloy melt 2.

[0078] In this embodiment, multiple tracks 823 are provided between the first frame 821 and the second frame 822. The upper end of the ultrasonic rod 824 is disposed on the track 823 and can move along the track 823, thereby adjusting the position of the ultrasonic rod 824 in the aluminum alloy melt 2. Additionally, an ultrasonic rod 824 is installed inside the second frame 822, inserted from above and passing through the second frame 822 into the aluminum alloy melt 2. The upper end of the ultrasonic rod 824 is snapped and fixed to the second frame 822. Further, the tracks 823 are arranged radially from the second frame 822 to the first frame 821. The ultrasonic rods 824 are evenly distributed. (Refer to...) Figure 3 The first frame 821 and the second frame 822 can be circular.

[0079] For large-size high-alloy aluminum alloy ingots 9, macroscopic segregation and hot cracking are prone to occur during the casting process. Electromagnetic and ultrasonic composite energy field assisted casting technology can form forced convection in the aluminum alloy melt 2, improve the uniformity of the melt, reduce the temperature gradient, and reduce the probability of hot cracking. In the aluminum alloy semi-continuous casting device of this application embodiment, the position of the electromagnetic generator 74, the number and position of the ultrasonic rods 824, the intensity of the electromagnetic generator 74, and the ultrasonic vibration intensity are all flexibly adjustable, greatly expanding the application scenarios of the device.

[0080] The semi-continuous aluminum alloy casting apparatus of this application embodiment can be used for the preparation of large-size high-alloy aluminum alloy ingots 9. The specific method is as follows:

[0081] The aluminum raw material is placed in melting furnace 1 and heated to melt. Then, the temperature of the aluminum alloy melt 2 is maintained at 740℃. It is refined twice with hexachloroethane, 10 minutes each time, with a refining agent dosage of 0.5 wt.%. After each addition of the refining agent, slag is removed after 5 minutes. Then, it is refined twice with argon gas blowing. After refining, it is allowed to stand for 15 minutes. The furnace temperature is then raised to 710℃ in preparation for casting.

[0082] The sprue head 10 is raised into the crystallizer 6 to prevent aluminum leakage when the molten aluminum alloy 2 enters the cavity of the crystallizer 6. The molten aluminum alloy 2 is injected into the cavity of the crystallizer 6 through the flow channel 3, and cooling water is introduced into the first water tank 62 of the crystallizer 6 before casting begins. The casting process parameters are: casting speed 20-100 mm / min, water pressure 0.1-0.5 MPa, flow rate 5-20 m³ / min.3 / h.

[0083] First, cast a 200mm thick sample without the external electromagnetic stirring unit 7 and ultrasonic vibration unit 8. After the casting stabilizes, cool water is injected into the second water tank 73. Then, the electromagnetic generator 74 is turned on, and the ultrasonic rod 824 is inserted into the aluminum alloy melt 2. After all the aluminum alloy melt 2 has been injected into the crystallizer 6, the ultrasonic power is turned off, and the ultrasonic rod 824 is removed. After all the aluminum alloy melt 2 has solidified, the electromagnetic generator 74 is turned off.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A semi-continuous aluminum alloy casting apparatus, characterized in that: It includes a flow channel, a graphite ring, a crystallizer, an electromagnetic stirring unit, an ultrasonic vibration unit, and a siphon head, wherein the crystallizer has a cavity; The end of the flow channel is connected to the cavity of the crystallizer to introduce aluminum alloy melt; the graphite ring is disposed on the inner wall of the first water tank of the crystallizer; the ingot head is disposed below the graphite ring and moves up and down along the central axis of the crystallizer; the ultrasonic vibration unit extends into the cavity of the crystallizer to act on the aluminum alloy melt. The electromagnetic stirring unit includes multiple electromagnetic generators and multiple second water tanks. The cross-section of the electromagnetic generator is annular, and each electromagnetic generator is respectively disposed in a second water tank. A second water tank is disposed on the outer periphery of the first water tank of the crystallizer, and multiple second water tanks are disposed sequentially below the first water tank of the crystallizer.

2. The aluminum alloy semi-continuous casting apparatus according to claim 1, characterized in that, The central axis of the plurality of electromagnetic generators coincides with the central axis of the crystallizer.

3. The aluminum alloy semi-continuous casting apparatus according to claim 1, characterized in that, The current directions in two adjacent electromagnetic generators are opposite.

4. The aluminum alloy semi-continuous casting apparatus according to claim 1, characterized in that, The electromagnetic generator includes a silicon steel yoke and a coil. The silicon steel yoke is annular, and the inner wall of the silicon steel yoke is provided with multiple ribs, with the coil wound around each rib.

5. The aluminum alloy semi-continuous casting apparatus according to claim 1, characterized in that, The electromagnetic stirring unit further includes a connecting rod, a partition plate, and a support plate. The upper end of the connecting rod is fixed to the base of the crystallizer. Multiple support plates are provided on the connecting rod, and a second water tank is hung below each support plate. An electromagnetic generator is placed in each second water tank. Multiple partition plates are provided on the connecting rod, and a partition plate is provided between each second water tank to isolate two adjacent electromagnetic generators.

6. The aluminum alloy semi-continuous casting apparatus according to claim 5, characterized in that, The support plate and the partition plate are respectively movably mounted on the connecting rod.

7. The aluminum alloy semi-continuous casting apparatus according to claim 1, characterized in that, The second water tank includes a tank body and a baffle. The tank body is provided with an inlet and an outlet, and the baffle is disposed inside the tank body to separate the inlet and the outlet.

8. The aluminum alloy semi-continuous casting apparatus according to claim 7, characterized in that, The cross-section of the box is annular, and the water inlet is located on the outer periphery of the box; there are multiple water outlets, which are arranged along the inner periphery of the box.

9. The aluminum alloy semi-continuous casting apparatus according to any one of claims 1 to 8, characterized in that, The ultrasonic vibration unit includes a horizontal adjustment unit, a vertical adjustment unit, and multiple ultrasonic rods. The horizontal adjustment unit is located above the crystallizer, and the vertical adjustment unit supports the horizontal adjustment unit to adjust its position. One end of each ultrasonic rod is mounted on the horizontal adjustment unit and can move along the horizontal adjustment unit, while the other end extends into the molten aluminum alloy.

10. The aluminum alloy semi-continuous casting apparatus according to claim 9, characterized in that, The horizontal adjustment unit includes a first frame, a second frame, and tracks. The first frame is located on the outer periphery of the second frame and is mounted on the vertical adjustment unit. Multiple tracks are installed between the first frame and the second frame. Each track is equipped with an ultrasonic rod, and the ultrasonic rod slides on the track. An ultrasonic rod is installed inside the second frame and is engaged with the second frame.

11. The aluminum alloy semi-continuous casting apparatus according to claim 10, characterized in that, The multiple tracks are arranged radially from the second frame to the first frame.

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