Electromagnetic-gas synergistic stirring device and method for preparing semi-solid slurry of aluminum alloy

Abstract

The application relates to an electromagnetic-gas synergistic stirring aluminum alloy semi-solid slurry preparation device, which comprises a stirring furnace, an accommodating cavity for placing a crucible is arranged in the stirring furnace, an electromagnetic stirring assembly and a gas stirring assembly are arranged in the accommodating cavity; the electromagnetic stirring assembly comprises electromagnetic induction coils which are circumferentially distributed on the circumferential side of the accommodating cavity; the gas stirring assembly comprises a stirring rod which is driven to rotate by a motor, the stirring rod is hollow and connected with a gas source, and gas outlet micropores are arranged on the stirring rod. In the stirring and aeration process, the electromagnetic field and the gas flow do not operate independently, but form a synergistic effect through mutual cooperation, and the treatment effect of the melt is collectively optimized.

Description

Technical Field

[0001] This invention relates to an apparatus and method for preparing semi-solid aluminum alloy slurry by electromagnetic-gas coordinated stirring. Background Technology

[0002] In recent years, with the rapid development of computer technology and materials science, aluminum alloy semi-solid forming technology has gradually become an important research field, opening up new avenues for aluminum alloy forming. Aluminum alloy semi-solid forming technology refers to forming processes using semi-solid alloy slurries with controllable morphology. Compared with traditional aluminum alloy forming technologies, aluminum alloy semi-solid forming technology has many advantages, the most prominent being superior mechanical properties and surface quality. Semi-solid forming can achieve uniform grain structures and high-density, non-porous, and non-grain boundary crack high-quality formed parts, greatly improving product lifespan and reliability. Furthermore, semi-solid forming also offers advantages such as high precision, short forming cycle, small processing deformation, and energy saving, significantly reducing production costs and processing time. It has broad application prospects in aerospace, automotive, shipbuilding, and electronics fields, and many countries and regions internationally have already conducted related research on aluminum alloy semi-solid forming technology. However, the key to obtaining high-quality semi-solid slurries lies in the selection of the stirring technology.

[0003] AikeDi (Shenzhen) Precision Components Co., Ltd. has proposed a method for preparing semi-solid aluminum alloy slurry using inert gas stirring (CN120696372A). The technical solution involves modifying the bottom of the crucible into a permeable microporous plate, through which inert gas is introduced into the crucible, utilizing the rising bubbles to stir the melt. This method improves the uniformity of bubble distribution in traditional top-mounted spray gun stirring to some extent. However, this technical solution still has the following shortcomings: (1) Gas stirring alone has limited effect in the high viscosity range: When the aluminum alloy enters the semi-solid range (solid fraction > 20%), the melt viscosity increases sharply, the bubble rising speed decreases significantly, and the shearing effect of gas stirring is greatly weakened. This patent does not provide a technical means to solve the problem of the decrease in stirring effect under high viscosity.

[0004] (2) Bubbles are prone to coalesce and merge, making it difficult to form fine and uniform bubbles: Bubbles generated solely by the bottom permeable plate are prone to coalesce and merge during the ascent, forming larger bubbles and reducing stirring efficiency.

[0005] (3) Lack of macro-flow drive and single bubble path: the bubbles rise vertically only by their own buoyancy, the path is short, and the stirring effect on the edge area of ​​the melt is limited.

[0006] Based on this, in order to solve the above technical problems, this case proposes an apparatus and method for preparing semi-solid aluminum alloy slurry by electromagnetic-gas synergistic stirring. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an apparatus and method for preparing aluminum alloy semi-solid slurry by electromagnetic-gas synergistic stirring.

[0008] To solve the above-mentioned technical problems, the technical solution of the present invention is: an electromagnetic-gas synergistic stirring device for preparing semi-solid aluminum alloy slurry, including a stirring furnace, wherein the stirring furnace is provided with a receiving cavity for placing a crucible, and an electromagnetic stirring component and a gas stirring component are provided in the receiving cavity. The electromagnetic stirring assembly includes electromagnetic induction coils circumferentially distributed on the periphery of the receiving cavity. The gas stirring assembly includes a stirring rod driven by a motor to rotate. The stirring rod is hollow inside and connected to a gas source. The stirring rod is provided with gas outlet microholes.

[0009] Preferably, the stirring furnace includes a furnace shell, and an asbestos insulation layer is provided between the furnace shell and the electromagnetic induction coil.

[0010] Preferably, the top of the receiving cavity is provided with a receiving cavity inlet and outlet, the receiving cavity inlet and outlet are provided with an inlet and outlet cover plate, and a horizontal crucible platform is fixedly provided at the bottom of the inner cavity of the receiving cavity.

[0011] Preferably, the inlet / outlet cover is connected to a drive mechanism to drive the inlet / outlet cover to perform vertical lifting and horizontal swinging, and the gas stirring assembly is installed on the inlet / outlet cover.

[0012] Preferably, the stirring rod is vertical in axis and its top is mounted in the middle position of the inlet and outlet cover plate via a bearing. The top of the stirring rod extends upward to the top of the inlet and outlet cover plate and is connected to an air inlet hose via a rotary joint. The air inlet hose is connected to a gas cylinder that serves as a gas source, and an adjustment valve is provided on the air inlet hose.

[0013] Preferably, a driven gear is coaxially fixed to the stirring rod between the inlet / outlet cover and the rotary joint, and a driving gear is engaged around the periphery of the driven gear. The driving gear is driven to rotate by a first motor, and the first motor is fixedly connected to the inlet / outlet cover via a motor mounting plate.

[0014] Preferably, the gas outlet micropores are located on the bottom end face of the stirring rod and are arranged in several ways to form a gas distributor.

[0015] Preferably, the inlet / outlet cover is provided with a crucible clamping assembly, which includes a left clamping member and a right clamping member symmetrically distributed on the left and right sides. Each of the left and right clamping members includes a vertical elastic rod. The top end of each elastic rod is fixedly disposed on the bottom surface of the inlet / outlet cover, and the bottom end of each elastic rod is fixedly disposed with an arc-shaped clamping plate for clamping the outer periphery of the crucible, which is wider at the top and narrower at the bottom.

[0016] Preferably, the driving mechanism includes a lifting plate, and a sliding block slide rail moving pair for vertical guidance is connected between the lifting plate and the outer periphery of the mixing furnace. A ball screw pair driven by a motor is also connected between the lifting plate and the outer periphery of the mixing furnace to drive the lifting plate to perform lifting and adjusting. A second motor is fixedly connected to the top of the lifting plate, and the output shaft of the second motor faces upward and is fixedly connected to a transition plate. The transition plate is fixedly connected to the inlet and outlet cover plate as a whole.

[0017] A method for operating an electromagnetic-gas co-stirring apparatus for preparing semi-solid aluminum alloy slurry, comprising the following steps: S1. The inlet and outlet cover plates first rise to fully elevate the crucible clamping assembly out of the receiving cavity. Then, the inlet and outlet cover plates are horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not located above the stirring furnace. Then, the inlet and outlet cover plates are lowered to a certain height to lower the position of the crucible clamping assembly. The molten metal is poured into the crucible. Then, the elastic rods of the left and right clamping parts are pried open outward to clamp the crucible between the left and right clamping plates. The inlet and outlet cover plates first rise, then are horizontally rotated inward at a certain angle, and finally lowered to place the crucible on the crucible platform. S2. After the crucible is in place, the first motor is started. The first motor drives the stirring rod to rotate via the main and driven gears. At the same time, the electromagnetic induction coil is turned on. The alternating magnetic field generated by the coil applies electromagnetic stirring force to the melt. The mechanical rotation direction of the crucible is opposite to the electromagnetic stirring direction. The two work together to form a strong turbulent field inside the melt, making the temperature and alloy composition distribution of the molten metal more uniform, achieving full stirring and homogenization. While stirring is in progress or at a specific stage according to process needs, the gas cylinder is opened. The protective gas or reaction gas stored inside is delivered through the gas inlet hose. After the flow rate and pressure are regulated by the regulating valve, it enters the gas distributor at the bottom of the stirring rod. The gas distributor evenly disperses the gas into the interior of the crucible, expels air and maintains the required process atmosphere, effectively preventing the molten metal from oxidizing and absorbing gas at high temperatures, and ensuring the quality of smelting. S3. After smelting, stirring and gasification are completed, the electromagnetic induction coil is turned off in sequence, the first motor is turned off to stop the stirring rod from rotating, and the gas cylinder stops supplying gas. The inlet and outlet cover plates are first raised to completely raise the crucible clamping assembly out of the receiving cavity. The inlet and outlet cover plates are then horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not above the stirring furnace. Then the inlet and outlet cover plates are lowered to a certain height so that the position of the crucible clamping assembly is lowered. Then the elastic rods of the left and right clamping parts are pried open outward to remove the crucible, pour out the solution, and clean and inspect the inside of the crucible to complete the entire workflow.

[0018] Compared with existing technologies, this invention has the following advantages: In the stirring and aeration process, the electromagnetic field and gas flow do not operate independently, but rather cooperate to form a synergistic effect, jointly optimizing the processing effect of the melt. Its synergistic working mechanism is mainly reflected in the following aspects: This invention addresses the problems of discontinuous effects, uneven bubble distribution, and difficulty in bubble removal under high viscosity in the preparation of semi-solid aluminum alloy slurries by using a single stirring method. It achieves synergy through the structural integration and functional complementarity of electromagnetic stirring and gas stirring. The macroscopic volume force generated by electromagnetic stirring drives large-scale forced convection in the melt, achieving initial homogenization of overall temperature and composition, and providing additional power for bubble rise, overcoming the viscous resistance of the high-viscosity melt and accelerating bubble escape. The microscopic shear force generated by gas stirring acts on the dendrite growth front and bubble interface, refining the bubble and grain structure and promoting uniform composition in micro-regions, thus overcoming the technical defects existing in the prior art.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the structure of an embodiment of the present invention.

[0021] Figure 2 This is a bottom view of the gas distributor.

[0022] Figure 3 This is a schematic diagram showing the working state of the crucible clamping assembly. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] like Figures 1-3 As shown, this embodiment provides an aluminum alloy semi-solid slurry preparation device with electromagnetic-gas synergistic stirring, including a stirring furnace 1. The stirring furnace is provided with a receiving cavity 3 for placing a crucible 2. The receiving cavity is provided with an electromagnetic stirring component and a gas stirring component. The electromagnetic stirring assembly includes electromagnetic induction coils 4 circumferentially distributed on the periphery of the receiving cavity. The electromagnetic stirring assembly applies a non-contact rotating magnetic field to molten aluminum alloy, driving the melt to flow uniformly and achieving macroscopic compositional and temperature homogeneity. The core component of this unit is an electromagnetic induction coil wound around the outside of the crucible. The coil is made of copper tubing, with cooling water circulating inside to prevent burn-out at high temperatures. The coil is wound in the lower middle section of the crucible's exterior, with 10-20 turns, maintaining a 10-20mm gap from the crucible's outer wall. An external frequency converter is connected to the coil, providing alternating current at a frequency of 5-50Hz and a current of 100-500A. When alternating current is supplied to the coil, it generates a rotating magnetic field inside the crucible. This magnetic field penetrates the crucible wall and acts on the molten aluminum alloy, using Lorentz force to drive the melt to flow uniformly, thus achieving macroscopic compositional and temperature homogeneity. The electromagnetic stirring assembly and the gas stirring assembly work together in the same furnace: in the initial stage (when the melt temperature is above the liquidus line), gas stirring is the main method and electromagnetic stirring is the auxiliary method; as the melt temperature decreases, it gradually transitions to a synergistic mode in which electromagnetic stirring is the main method and gas stirring is the auxiliary method, so as to achieve high-quality preparation of aluminum alloy semi-solid slurry.

[0027] The gas stirring assembly includes a stirring rod 5 driven to rotate by a motor. The stirring rod is hollow inside and connected to a gas source, and has micro-holes for gas outlet. The gas stirring assembly is used to introduce inert gas into the aluminum alloy melt, utilizing the turbulence and shear force generated by the rising bubbles to achieve degassing, purification, and grain refinement of the melt.

[0028] In this embodiment of the invention, the stirring furnace includes a furnace shell 6, and an asbestos insulation layer 7 is disposed between the furnace shell and the electromagnetic induction coil. The asbestos insulation layer reduces heat loss of the aluminum alloy melt in the crucible, maintains a stable melt temperature, and reduces energy consumption; the uniform thickness of the insulation layer reduces the temperature gradient on the crucible wall, which helps to form a uniform melt temperature field; the insulation layer material is usually asbestos felt, aluminum silicate fiber, or ceramic fiber, with a thickness of 20-50 mm, and can withstand high temperatures above 800℃.

[0029] In this embodiment of the invention, the top of the receiving cavity is provided with a receiving cavity inlet and outlet, the receiving cavity inlet and outlet are provided with an inlet and outlet cover plate 8, and a horizontal crucible platform 9 is fixedly provided at the bottom of the inner cavity of the receiving cavity.

[0030] In this embodiment of the invention, the inlet and outlet cover is connected to a driving mechanism to drive the inlet and outlet cover to perform vertical lifting and horizontal swinging, and the gas stirring assembly is installed on the inlet and outlet cover.

[0031] In this embodiment of the invention, the stirring rod is vertical in axis and its top is mounted in the middle position of the inlet and outlet cover plate via a bearing 10. The top of the stirring rod extends upward to the top of the inlet and outlet cover plate and is connected to an air inlet hose 12 via a rotary joint 11. The air inlet hose is connected to a gas cylinder 13, which serves as a gas source, and an adjusting valve 14 is provided on the air inlet hose.

[0032] In this embodiment of the invention, a driven gear 15 is coaxially fixed to the stirring rod between the inlet / outlet cover and the rotary joint. The driven gear is engaged with a driving gear 16 on its periphery. The driving gear is driven to rotate by a first motor 17. The first motor is fixedly connected to the inlet / outlet cover via a motor mounting plate 18.

[0033] In this embodiment of the invention, the gas outlet micropores 26 are located on the bottom end face of the stirring rod and are arranged in several circles to form a gas distributor 19. The gas outlet micropores of the gas distributor are distributed in several rings from the inside to the outside, with several micropores in each ring, ensuring that the gas is released evenly at different depths and in the circumferential direction, and avoiding the concentration of bubbles in a certain area. The distance between the lower end of the stirring rod and the bottom of the crucible is controlled at 10-30 mm to ensure that the bottom area can also obtain a good gas stirring effect.

[0034] In this embodiment of the invention, a crucible clamping assembly is provided on the inlet / outlet cover plate. The crucible clamping assembly includes a left clamping member and a right clamping member symmetrically distributed on the left and right sides. Both the left and right clamping members include a vertical elastic rod 20. The top end of the elastic rod is fixedly disposed on the bottom surface of the inlet / outlet cover plate, and the bottom end of the elastic rod is fixedly disposed with an arc-shaped clamping plate 21 for clamping the outer periphery of the crucible, which is wider at the top and narrower at the bottom.

[0035] In this embodiment of the invention, the driving mechanism includes a lifting plate 22. A sliding block slide rail moving pair 23 for vertical guidance is connected between the lifting plate and the outer periphery of the mixing furnace. A ball screw pair driven by a motor is also connected between the lifting plate and the outer periphery of the mixing furnace to drive the lifting plate to perform lifting and adjusting. A second motor 24 is fixedly connected to the top of the lifting plate. The output shaft of the second motor faces upward and is fixedly connected to a transition plate 25. The transition plate is fixedly connected to the inlet and outlet cover plate as a whole.

[0036] In this embodiment of the invention, the stirring rod is made of a material that is chemically inert to the aluminum alloy melt to prevent it from reacting with the melt at high temperatures and causing contamination.

[0037] The operating method of an electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry is as follows: S1. The inlet and outlet cover plates first rise to fully elevate the crucible clamping assembly out of the receiving cavity. Then, the inlet and outlet cover plates are horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not located above the stirring furnace. Then, the inlet and outlet cover plates are lowered to a certain height to lower the position of the crucible clamping assembly. The molten metal is poured into the crucible. Then, the elastic rods of the left and right clamping parts are pried open outward to clamp the crucible between the left and right clamping plates. The inlet and outlet cover plates first rise, then are horizontally rotated inward at a certain angle, and finally lowered to place the crucible on the crucible platform. S2. After the crucible is in place, the first motor is started. The first motor drives the stirring rod to rotate via the main and driven gears. At the same time, the electromagnetic induction coil is turned on. The alternating magnetic field generated by the coil applies electromagnetic stirring force to the melt. The mechanical rotation direction of the crucible is opposite to the electromagnetic stirring direction. The two work together to form a strong turbulent field inside the melt, making the temperature and alloy composition distribution of the molten metal more uniform, achieving full stirring and homogenization. While stirring is in progress or at a specific stage according to process needs, the gas cylinder is opened. The protective gas or reaction gas stored inside is delivered through the gas inlet hose. After the flow rate and pressure are regulated by the regulating valve, it enters the gas distributor at the bottom of the stirring rod. The gas distributor evenly disperses the gas into the interior of the crucible, expels air and maintains the required process atmosphere, effectively preventing the molten metal from oxidizing and absorbing gas at high temperatures, and ensuring the quality of smelting. S3. After smelting, stirring and gasification are completed, the electromagnetic induction coil is turned off in sequence, the first motor is turned off to stop the stirring rod from rotating, and the gas cylinder stops supplying gas. The inlet and outlet cover plates are first raised to completely raise the crucible clamping assembly out of the receiving cavity. The inlet and outlet cover plates are then horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not above the stirring furnace. Then the inlet and outlet cover plates are lowered to a certain height so that the position of the crucible clamping assembly is lowered. Then the elastic rods of the left and right clamping parts are pried open outward to remove the crucible, pour out the solution, and clean and inspect the inside of the crucible to complete the entire workflow.

[0038] This invention integrates two stirring methods into the same furnace structure, utilizing the synergistic effect of the macroscopic volume force of electromagnetic stirring and the microscopic shear force of gas stirring to simultaneously achieve macroscopic uniformity and microscopic refinement, thus overcoming the limitations of a single stirring method in the preparation of semi-solid aluminum alloy slurry.

[0039] The gas stirring rod of this invention causes the bubble release point to move continuously across the entire cross-section of the crucible, achieving uniform bubble distribution. At the same time, the mechanical shear force generated by the rotation of the stirring rod acts directly on the melt, eliminating the stirring dead zone.

[0040] The rotation of the stirring rod in this invention provides controllable rotational power to the crucible system, achieving uniform mixing and temperature equilibrium of materials during melting or processing. After the first motor starts, power is transmitted to the rotating stirring rod, which works in conjunction with the electromagnetic induction coil. The mechanical rotation direction of the crucible stirring is opposite to the electromagnetic stirring direction. Under the combined action of centrifugal force and gravity, the material continuously tumbles and exchanges positions, thereby effectively improving the compositional uniformity and temperature field distribution of the melt, and enhancing the melting quality. Simultaneously, by adjusting the motor speed, precise control of the rotational speed can be achieved to meet the requirements of stirring intensity or centrifugal casting speed at different process stages.

[0041] This invention utilizes the reverse action of mechanical and electromagnetic stirring to create intense shear turbulence within the melt, effectively breaking down potential circulation dead zones and directional flow lines generated by electromagnetic stirring. This ensures thorough stirring in all regions of the melt, preventing compositional segregation and temperature stratification. Secondly, the complex flow field generated by the dual reverse stirring accelerates heat and mass transfer within the melt, shortening melting time and improving melting efficiency. Thirdly, in special processes such as centrifugal casting, by adjusting the relative magnitudes of the mechanical rotation speed and electromagnetic stirring intensity, the filling and solidification behavior of the melt can be flexibly controlled, meeting the differentiated requirements of various alloy materials and process parameters for melt flow characteristics. The synergistic combination of mechanical rotation and electromagnetic stirring provides a more flexible and precise means of process control for the melting process.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for preparing semi-solid aluminum alloy slurry by electromagnetic-gas coordinated stirring, characterized in that: The system includes a stirring furnace, the interior of which is provided with a receiving cavity for placing a crucible, and the receiving cavity is provided with an electromagnetic stirring assembly and a gas stirring assembly; The electromagnetic stirring assembly includes electromagnetic induction coils circumferentially distributed on the periphery of the receiving cavity. The gas stirring assembly includes a stirring rod driven by a motor to rotate. The stirring rod is hollow inside and connected to a gas source. The stirring rod is provided with gas outlet microholes.

2. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 1, characterized in that: The stirring furnace includes a furnace shell, and an asbestos insulation layer is provided between the furnace shell and the electromagnetic induction coil.

3. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 1, characterized in that: The top of the cavity is provided with a cavity inlet and outlet, and an inlet and outlet cover is provided on the cavity inlet and outlet. A horizontal crucible platform is fixedly provided at the bottom of the cavity.

4. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 3, characterized in that: The inlet and outlet cover is connected to a drive mechanism to drive the inlet and outlet cover to move vertically and rotate horizontally, and the gas stirring assembly is installed on the inlet and outlet cover.

5. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 4, characterized in that: The stirring rod is vertical in axis and its top is mounted in the middle of the inlet and outlet cover plate via a bearing. The top of the stirring rod extends upward to the top of the inlet and outlet cover plate and is connected to an air inlet hose via a rotary joint. The air inlet hose is connected to a gas cylinder that serves as the gas source and is equipped with a regulating valve.

6. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 5, characterized in that: A driven gear is coaxially fixed to the stirring rod between the inlet / outlet cover and the rotary joint. The driven gear is meshed with a driving gear on its periphery. The driving gear is driven to rotate by a first motor, which is fixedly connected to the inlet / outlet cover via a motor mounting plate.

7. The electromagnetic-gas synergistic stirring apparatus for preparing semi-solid aluminum alloy slurry according to claim 1, characterized in that: The gas outlet micropores are located on the bottom end face of the stirring rod and are arranged in several ways to form a gas distributor.

8. The apparatus for preparing semi-solid aluminum alloy slurry by electromagnetic-gas coordinated stirring according to claim 3, characterized in that: The inlet and outlet cover plate is provided with a crucible clamping assembly, which includes a left clamping member and a right clamping member symmetrically distributed on the left and right sides. Both the left and right clamping members include a vertical elastic rod. The top end of the elastic rod is fixedly set on the bottom surface of the inlet and outlet cover plate, and the bottom end of the elastic rod is fixedly set with an arc-shaped clamping plate for clamping the outer periphery of the crucible, which is wider at the top and narrower at the bottom.

9. The apparatus for preparing semi-solid aluminum alloy slurry by electromagnetic-gas coordinated stirring according to claim 4, characterized in that: The driving mechanism includes a lifting plate, and a sliding block slide rail moving pair for vertical guidance is connected between the lifting plate and the outer periphery of the mixing furnace. A ball screw pair driven by a motor is also connected between the lifting plate and the outer periphery of the mixing furnace to drive the lifting plate to adjust its height. A second motor is fixedly connected to the top of the lifting plate, and the output shaft of the second motor faces upward and is fixedly connected to a transition plate. The transition plate is fixedly connected to the inlet and outlet cover plate as a whole.

10. A method for operating the electromagnetic-gas co-stirring aluminum alloy semi-solid slurry preparation apparatus as described in any one of claims 1-9, characterized in that, Follow these steps: S1. The inlet and outlet cover plates first rise to fully elevate the crucible clamping assembly out of the receiving cavity. Then, the inlet and outlet cover plates are horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not located above the stirring furnace. Then, the inlet and outlet cover plates are lowered to a certain height to lower the position of the crucible clamping assembly. The molten metal is poured into the crucible. Then, the elastic rods of the left and right clamping parts are pried open outward to clamp the crucible between the left and right clamping plates. The inlet and outlet cover plates first rise, then are horizontally rotated inward at a certain angle, and finally lowered to place the crucible on the crucible platform. S2. After the crucible is in place, the first motor is started. The first motor drives the stirring rod to rotate via the main and driven gears. At the same time, the electromagnetic induction coil is turned on. The alternating magnetic field generated by the coil applies electromagnetic stirring force to the melt. The mechanical rotation direction of the crucible is opposite to the electromagnetic stirring direction. The two work together to form a strong turbulent field inside the melt, making the temperature and alloy composition distribution of the molten metal more uniform, achieving full stirring and homogenization. While stirring is in progress or at a specific stage according to process needs, the gas cylinder is opened. The protective gas or reaction gas stored inside is delivered through the gas inlet hose. After the flow rate and pressure are regulated by the regulating valve, it enters the gas distributor at the bottom of the stirring rod. The gas distributor evenly disperses the gas into the interior of the crucible, expels air and maintains the required process atmosphere, effectively preventing the molten metal from oxidizing and absorbing gas at high temperatures, and ensuring the quality of smelting. S3. After smelting, stirring and gasification are completed, the electromagnetic induction coil is turned off in sequence, the first motor is turned off to stop the stirring rod from rotating, and the gas cylinder stops supplying gas. The inlet and outlet cover plates are first raised to completely raise the crucible clamping assembly out of the receiving cavity. The inlet and outlet cover plates are then horizontally rotated outward at a certain angle so that the inlet and outlet cover plates are not above the stirring furnace. Then the inlet and outlet cover plates are lowered to a certain height so that the position of the crucible clamping assembly is lowered. Then the elastic rods of the left and right clamping parts are pried open outward to remove the crucible, pour out the solution, and clean and inspect the inside of the crucible to complete the entire workflow.

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