阅读说明：本技术 一种镁合金熔体机械旋转搅拌喷吹处理装置及处理方法 (Mechanical rotary stirring and blowing treatment device and treatment method for magnesium alloy melt ) 是由 李翔光 倪明 邵军 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种镁合金熔体机械旋转搅拌喷吹处理装置及处理方法,包括气体供应装置、混气装置、动力系统、盖板、叶轮转子、导流筒,导气管,坩埚,壳体,其中,气体供应装置出气口与混气装置进气口连接,混气装置出气口与动力系统进气口连接,动力系统出气口与导气管进气口固定连接,导气管穿过导流筒顶部并伸入至导流筒下部,导气管与导流筒顶部固定连接,导流筒设置在坩埚下部,导气管出气口处设置有叶轮转子,叶轮转子与动力系统连接,壳体顶部设置有盖板,导气管穿过盖板伸入坩埚内。使用本发明装置与处理方法所制备的合金,能够明显提高镁合金熔体的处理质量,同时提升了生产效率。(The invention discloses a magnesium alloy melt mechanical rotation stirring and blowing treatment device and a treatment method, and the device comprises a gas supply device, a gas mixing device, a power system, a cover plate, an impeller rotor, a guide cylinder, a gas guide tube, a crucible and a shell, wherein a gas outlet of the gas supply device is connected with a gas inlet of the gas mixing device, a gas outlet of the gas mixing device is connected with a gas inlet of the power system, a gas outlet of the power system is fixedly connected with a gas inlet of the gas guide tube, the gas guide tube penetrates through the top of the guide cylinder and extends into the lower part of the guide cylinder, the gas guide tube is fixedly connected with the top of the guide cylinder, the guide cylinder is arranged at the lower part of the crucible, the impeller rotor is arranged at the gas outlet of the gas guide tube, the. The alloy prepared by the device and the treatment method can obviously improve the treatment quality of the magnesium alloy melt and simultaneously improve the production efficiency.)

1. The utility model provides a magnesium alloy fuse-element machinery rotating stirring jetting processing apparatus which characterized in that: comprises a gas supply device (1), a gas mixing device (2), a power system (3), a solvent quantitative supply system (4), a cover plate (5), an impeller rotor (6), a guide cylinder (7), a gas guide pipe (8), a crucible (9) and a shell (10), wherein a gas outlet of the gas supply device (1) is connected with a gas inlet of the gas mixing device (2), a gas outlet of the gas mixing device (2) is connected with a gas inlet of the power system (3), a gas outlet of the power system (3) is fixedly connected with a gas inlet of the gas guide pipe (8), the gas guide pipe (8) penetrates through the top of the guide cylinder (7) and extends into the lower part of the guide cylinder (7), the gas guide pipe (8) is fixedly connected with the top of the guide cylinder (7), the guide cylinder (7) is arranged at the lower part of the crucible (9), the impeller rotor (6) is arranged at the gas outlet of the gas guide pipe (8, the top of the shell (10) is provided with a cover plate (5), and the gas guide pipe (8) penetrates through the cover plate (5) and extends into the crucible (9).

2. The magnesium alloy melt mechanical rotary stirring and blowing processing device as set forth in claim 1, wherein: the gas supply device (1) supplies argon gas and carbon dioxide.

3. The magnesium alloy melt mechanical rotary stirring and blowing processing device as set forth in claim 1, wherein: the power system (3) is a motor, the power system (3) is provided with a shaft, and the power system (3) is coaxially connected with the impeller rotor (6) through the shaft.

4. The magnesium alloy melt mechanical rotary stirring and blowing processing device as set forth in claim 1, wherein: the stirring head of the impeller rotor (6) is 3 symmetrically distributed blades.

5. The magnesium alloy melt mechanical rotary stirring and blowing processing device as set forth in claim 1, wherein: the side surface of the shell (10) is provided with a solvent quantitative supply system (4), and a liquid guide pipe of the solvent quantitative supply system (4) extends into the top of the crucible (9) from the upper part of the shell (10).

6. The magnesium alloy melt mechanical rotary stirring and blowing processing device as set forth in claim 1, wherein: the top end of the shell (10) is provided with a lifting arm (11), and the top of the lifting arm (11) is connected with the cover plate (5).

7. A magnesium alloy melt mechanical rotary stirring blowing processing method according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:

s1: after the alloy liquid is completely melted, adjusting the temperature of the melt to 780-820 ℃, extending a guide cylinder (7) and an impeller rotor (6) which are preheated to 500-700 ℃ into 2/3 of the depth of the melt, and covering a cover plate (5);

s2: starting a gas supply system (1), adjusting the flow of carbon dioxide gas to be 0.5-1.8L/min, adjusting the flow of argon gas to be 0.6-2.0L/min, starting a power system (3), adjusting the rotating speed of an impeller rotor (6) to be 100-300 r/min, starting a solvent quantitative supply system (4), setting the solvent supply rate to be 100-1000 g/min, and processing for 10-30 min;

s3: after the melt is processed, the power system (3) is closed, then the solvent quantitative supply system (4) is closed, the gas supply system is closed, and then the impeller rotor (6) is moved out;

s4: removing a slag layer on the surface of the melt, uniformly scattering a next layer of solvent A through a solvent quantitative supply system (4), adjusting the temperature to 780-820 ℃, keeping the temperature and standing for 10-50 min, and then adjusting the temperature of the melt to 680-760 ℃ for pouring.

8. The mechanical rotary stirring and blowing treatment method of the magnesium alloy melt as claimed in claim 7, wherein: in the step S2, the flow rate of the carbon dioxide gas is adjusted to be 1.0L/min, the flow rate of the argon gas is adjusted to be 1.2L/min, the power system (3) is started, the rotating speed of the impeller rotor (6) is adjusted to be 150r/min, the impeller rotor (6) rotates clockwise, the quantitative solvent supply system (4) is started, the solvent supply rate is set to be 110g/min, and the treatment is carried out for 12 min.

9. The mechanical rotary stirring and blowing treatment method of the magnesium alloy melt as claimed in claim 7, wherein: in the step S4, the solvent A is RJ-2 or RJ-5.

10. The mechanical rotary stirring and blowing treatment method of the magnesium alloy melt as claimed in claim 7, wherein: in the step S4, the temperature is adjusted to 800 ℃, the temperature is kept and the mixture is kept standing for 12min, and then the melt temperature is adjusted to 720 ℃ for casting.

Technical Field

The invention belongs to the technical field of alloy preparation, and particularly relates to a mechanical rotary stirring and blowing treatment device and a treatment method for a magnesium alloy melt.

Background

The magnesium alloy as a high-quality metal structure material has high specific strength and specific stiffness, excellent casting performance and machining performance, is known as a green engineering material in the 21 st century, and has wide application in the fields of aerospace, electronics and automobiles. Because of the active property of magnesium alloy, the alloy is easy to burn and oxidize during smelting to form inclusions. In order to ensure the quality of the molten alloy and prevent oxide inclusions, the molten alloy needs to be refined. At present, the magnesium alloy refining mainly adopts a lower solvent method and a gas blowing refining method, mature magnesium alloy refining equipment does not exist in the market, and the existing aluminum alloy refining equipment and the existing aluminum alloy refining method can not be suitable for magnesium alloy refining.

The lower solvent method is characterized in that an operator holds a stirring spoon washed by a solvent, the spoon extends into the magnesium liquid to drag and stir the bottom, so that the magnesium liquid generates strong vertical circulation convection in the vertical direction, meanwhile, refining solvent fully dehydrated is continuously scattered on the surface of the magnesium liquid to fully contact with the magnesium liquid along with liquid flow which is turned up and down, and impurities suspended in the magnesium liquid are captured and precipitated to the bottom of a crucible through multiple circulation. Refining for about 7-12 minutes until no white oxide on the surface of the magnesium liquid turns from the bottom of the molten pool and the page presents a bright mirror surface.

The 'gas blowing refining method' is that dry argon is blown into the alloy liquid through a gas guide tube to form dense argon small bubbles, the dense argon small bubbles are blown out at the depth of the magnesium liquid, and the bubbles are fully contacted with the molten metal in the rising process. Because the partial pressure of argon is higher, hydrogen in the metal can constantly get into the bubble, and the bubble floats out the back, and the hydrogen in the bubble spills over thereupon to reach the mesh that removes hydrogen. The bubbles can also adsorb smaller impurities in the rising process and are removed along with the floating of the bubbles, thereby playing a certain deslagging role. The rising of dense bubbles can also drive the magnesium liquid to generate strong up-down circulation convection in the vertical direction, the solvent is continuously and uniformly scattered on the surface of the magnesium liquid, the solvent can fully contact with the magnesium liquid along with the liquid flow which is turned up and down, the combustion of the magnesium liquid is effectively prevented, and impurities suspended in the magnesium liquid are captured and settled, so that the dual effects of solvent refining and solvent protection are realized.

The stirring spoon is adopted for dragging the bottom and stirring and refining, an operator is required to have higher operation skill, the labor intensity is very high, the refining effect is greatly influenced by the operator, the stirring stability is poor, the defects of solvent, oxidation, slag inclusion and the like are easily caused, and the solution quality is difficult to ensure. Meanwhile, the method of refining by the refining spoon cannot achieve the effect of degassing.

The method of adopting gas blowing refining solves the problems of large operation difficulty, high refining labor intensity, unstable refining effect, incapability of degassing and the like of the lower solvent method, and realizes the composite refining of argon and solvent. However, when the refining method is used for refining the rare earth magnesium alloy with high viscosity, the problem of insufficient up-and-down stirring force of the alloy liquid exists, so that the solvent cannot be fully contacted with slag inclusion, and oxidation and solvent slag inclusion are easy to occur.

Meanwhile, magnesium-aluminum magnesium alloy needs to be subjected to modification treatment in the smelting process, so that a delta (Mg) matrix is refined. The magnesium alloy without modification has larger and coarser crystal grains, and is more obvious at the position of the casting wall thickness. The large crystal grains greatly aggravate the shrinkage porosity and the hot cracking tendency of the alloy, and obviously reduce the mechanical property. At present, magnesite is widely adopted for magnesium alloy modification, and MgCO is used as a main component of magnesite₃Reacting with alloy liquid to generate mass Al distributed in a dispersed way₄C₃Mass points increase crystal nuclei to refine crystal grains. However, the magnesite is used as natural mineral product, and MgCO is contained in magnesite of different batches₃The content difference of the components (A) and (B) is relatively obvious, which has relatively great influence on the deterioration effect and is easy to cause incomplete deterioration. Meanwhile, when magnesite is used for modification, impurities and impurity elements are brought in, and the quality of the alloy liquid is influenced to a certain extent. Meanwhile, magnesium alloy magnesite modification needs to be carried out before magnesium alloy refining, so that the smelting process is added, the magnesium alloy smelting time is prolonged, the efficiency is reduced, and the burning loss of magnesium alloy elements is increased.

Therefore, aiming at the characteristics of magnesium alloy and the characteristics of the current main magnesium alloy melt processing method, gas refining, chemical refining and gas modification are combined, a magnesium alloy melt mechanical rotary stirring and blowing processing device is designed, and a corresponding magnesium alloy melt processing method is provided, so that the defects of a lower solvent method, a gas blowing refining method and magnesium alloy magnesite modification are overcome, and the high-quality and high-efficiency mechanical processing of the magnesium alloy melt is realized.

Disclosure of Invention

In order to solve the technical problems, the invention provides a mechanical rotary stirring and blowing treatment device and a treatment method for a magnesium alloy melt, which can solve the problems of poor treatment quality and low efficiency of the magnesium alloy melt in the prior art.

The invention is realized by the following technical scheme.

The utility model provides a magnesium alloy fuse-element mechanical rotation stirring jetting processing apparatus, including gas supply device, mix the gas device, driving system, a cover plate, impeller rotor, the draft tube, the air duct, the crucible, and a housing, wherein, gas supply device gas outlet is connected with mixing the gas device air inlet, mix the gas device gas outlet and be connected with the driving system air inlet, driving system gas outlet and air duct air inlet fixed connection, the air duct passes the draft tube top and stretches into to the draft tube lower part, air duct and draft tube top fixed connection, the draft tube sets up in the crucible lower part, air duct gas outlet department is provided with impeller rotor, impeller rotor is connected with driving system, the casing top is provided with the apron, the air duct passes the apron and stretches into in the crucible.

Preferably, the gas supply means supplies argon and carbon dioxide.

Preferably, the power system is a motor, the power system is provided with a shaft, and the power system and the impeller rotor are coaxially connected through the shaft.

Preferably, the stirring head of the impeller rotor is 3 symmetrically distributed blades.

Preferably, the side surface of the shell is provided with a solvent quantitative supply system, and a liquid guide pipe of the solvent quantitative supply system extends from the upper part of the shell to the top of the crucible.

Preferably, the top end of the shell is provided with a lifting arm, and the top of the lifting arm is connected with the cover plate.

A mechanical rotary stirring and blowing treatment method for magnesium alloy melt comprises the following steps:

s1: after the alloy liquid is completely melted, the temperature of the melt is regulated to 780-820 ℃, a guide shell and an impeller rotor which are preheated to 500-700 ℃ are extended to 2/3 of the depth of the melt, a cover plate is covered,

s2: starting a gas supply system, adjusting the flow rate of carbon dioxide gas to be 0.5-1.8L/min, adjusting the flow rate of argon gas to be 0.6-2.0L/min, starting a power system, adjusting the rotating speed of an impeller rotor to be 100-300 r/min, starting a solvent quantitative supply system, setting the solvent supply rate to be 100-1000 g/min, processing for 10-30 min,

s3: after the melt is processed, the power system is closed, then the solvent quantitative supply system is closed, the gas supply system is closed, and then the impeller rotor is moved out,

s4: removing a slag layer on the surface of the melt, uniformly scattering a next layer of solvent A through a solvent quantitative supply system, adjusting the temperature to be 780-820 ℃, preserving the temperature, standing for 10-50 min, then adjusting the temperature of the melt to be 680-760 ℃ and then pouring.

Preferably, in step S2, the carbon dioxide gas flow rate is adjusted to 1.0L/min, the argon gas flow rate is adjusted to 1.2L/min, the power system is turned on, the impeller rotor rotation speed is adjusted to 150r/min, the impeller rotor rotates clockwise, the solvent quantitative supply system is turned on, the solvent supply rate is set to 110g/min, and the treatment is performed for 12 min.

Preferably, in the step S4, the solvent A is RJ-2 or RJ-5.

Preferably, in the step S4, the temperature is adjusted to 800 ℃, the mixture is kept at the temperature for 12min, and then the melt temperature is adjusted to 720 ℃ for casting.

The invention has the beneficial effects that:

1. when the device is used for treating the magnesium-aluminum magnesium alloy melt, the gas mixing device 2 uniformly mixes argon and carbon dioxide in a set proportion, the argon and the carbon dioxide are introduced into the melt through the center of the impeller rotor 6, and the argon and the carbon dioxide are broken into dispersed fine bubbles under the action of the rotating impeller rotor 6, so that the contact area of the gas and the melt is increased. The fine argon bubbles can adsorb impurities in the melt, so that the melt is physically purified; fine carbon dioxide bubbles react with the magnesium alloy melt to formFine Al₄C₃The particles realize the modification treatment of the melt, and improve modification effect and efficiency. Through the device, can realize that the fuse-element gaseous phase is rotten, gaseous phase purifies, chemical purification goes on and the combination of gas protection and solvent protection simultaneously, improves fuse-element treatment quality and efficiency.

2. Compared with the conventional method, the ZM5 alloy treated by the method has the advantages that the tensile strength and the elongation are respectively improved by 18 percent and 8 percent, the melt treatment time is shortened by 15 percent compared with the conventional common technology, and the production efficiency is effectively improved.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention;

in the figure: the device comprises a gas supply device 1, a gas mixing device 2, a power system 3, a solvent quantitative supply system 4, a cover plate 5, an impeller rotor 6, a guide cylinder 7, an air guide pipe 8, a crucible 9, a shell 10 and a lifting arm 11.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

Example 1:

as shown in fig. 1, a magnesium alloy melt mechanical rotation stirring jetting processing apparatus, includes a gas supply device 1, a gas mixing device 2, a power system 3, a cover plate 5, an impeller rotor 6, a draft tube 7, a gas guide tube 8, a crucible 9, and a housing 10, wherein, a gas outlet of the gas supply device 1 is connected with a gas inlet of the gas mixing device 2, a gas outlet of the gas mixing device 2 is connected with a gas inlet of the power system 3, a gas outlet of the power system 3 is fixedly connected with a gas inlet of the gas guide tube 8, the gas guide tube 8 penetrates through the top of the draft tube 7 and extends into the lower part of the draft tube 7, the gas guide tube 8 is fixedly connected with the top of the draft tube 7, the draft tube 7 is arranged at the lower part of the crucible 9, the gas outlet of the gas guide tube 8 is provided with the impeller rotor 6, the impeller rotor 6 is connected.

The gas supply device 1 supplies argon gas and carbon dioxide.

In order to prevent the molten metal in the crucible 9 from rotating to form vortex when the impeller rotor 6 is stirred, and to intensify the oxidation and gas entrainment of the alloy liquid, a guide cylinder 7 is added outside the impeller rotor 6 and is not connected with the impeller rotor 6.

The power system 3 is a motor, the power system 3 is provided with a shaft, the power system 3 is coaxially connected with the impeller rotor 6 through the shaft, and the motor drives the impeller rotor 6 to rotate at a set rotating speed.

The stirring head of the impeller rotor 6 is 3 symmetrically distributed blades, and when the stirring head rotates, the blades can drive the alloy liquid to turn up and down.

In order to prevent the molten metal in the crucible 9 from rotating to form vortex when the impeller rotor 6 is stirred, and to intensify the oxidation and gas entrainment of the alloy liquid, a guide cylinder 7 is added outside the impeller rotor 6 and is not connected with the impeller rotor 6.

The side of the shell 10 is provided with a solvent quantitative supply system 4, and a liquid guide pipe of the solvent quantitative supply system 4 extends from the upper part of the shell 10 to the top of the crucible 9.

Aiming at the problem that the solvent dosage and the throwing speed are difficult to control when the solvent is manually sprinkled, a solvent quantitative supply system 4 is added into the device, so that the solvent throwing speed can be adjusted.

The top end of the shell 10 is provided with a lifting arm 11, and the top of the lifting arm 11 is connected with the cover plate 5.

In order to strengthen the protection of the alloy melt, a cover plate 5 is arranged, during refining, the cover plate 5 is covered, gas blown out through the center of a stirring head of an impeller rotor 6 floats out of the alloy melt and is forcibly blocked by the cover plate 5 (the partial pressure of magnesium alloy steam is higher than that of argon, the magnesium alloy steam is not covered by the cover plate, the argon is flushed by the magnesium alloy steam to be contacted with air), and the gas covers the surface of the alloy melt, so that the gas protection of the alloy melt is realized.

A mechanical rotary stirring and blowing treatment method for magnesium alloy melt comprises the following steps:

s1: after the alloy liquid is completely melted, the temperature of the melt is adjusted to 800 ℃, a guide cylinder 7 and an impeller rotor 6 which are preheated to 600 ℃ are extended to 2/3 of the depth of the melt, a cover plate 5 is covered,

s2: starting the gas supply system 1, regulating the flow of carbon dioxide gas to be 1.0L/min, regulating the flow of argon gas to be 1.2L/min, starting the power system 3, regulating the rotating speed of the impeller rotor 6 to be 150r/min, clockwise rotating the impeller rotor 6, starting the solvent quantitative supply system 4, setting the solvent supply rate to be 110g/min, processing for 12min,

s3: after the melt is processed, the power system 3 is closed, then the solvent quantitative supply system 4 is closed, the gas supply system is closed, then the impeller rotor 6 is moved out,

s4: removing a slag layer on the surface of the melt, uniformly scattering a layer of solvent A through a solvent quantitative supply system 4, adjusting the temperature to 800 ℃, keeping the temperature and standing for 12min, and then adjusting the temperature of the melt to 720 ℃ for pouring.

In the step S4, the solvent A is RJ-2.

Example 2:

as shown in fig. 1, a magnesium alloy melt mechanical rotation stirring jetting processing apparatus, includes a gas supply device 1, a gas mixing device 2, a power system 3, a cover plate 5, an impeller rotor 6, a draft tube 7, a gas guide tube 8, a crucible 9, and a housing 10, wherein, a gas outlet of the gas supply device 1 is connected with a gas inlet of the gas mixing device 2, a gas outlet of the gas mixing device 2 is connected with a gas inlet of the power system 3, a gas outlet of the power system 3 is fixedly connected with a gas inlet of the gas guide tube 8, the gas guide tube 8 penetrates through the top of the draft tube 7 and extends into the lower part of the draft tube 7, the gas guide tube 8 is fixedly connected with the top of the draft tube 7, the draft tube 7 is arranged at the lower part of the crucible 9, the gas outlet of the gas guide tube 8 is provided with the impeller rotor 6, the impeller rotor 6 is connected.

The gas supply device 1 supplies argon gas and carbon dioxide.

The power system 3 is a motor, the power system 3 is provided with a shaft, the power system 3 is coaxially connected with the impeller rotor 6 through the shaft, and the motor drives the impeller rotor 6 to rotate at a set rotating speed.

The stirring head of the impeller rotor 6 is 3 symmetrically distributed blades, and when the stirring head rotates, the blades can drive the alloy liquid to turn up and down.

In order to prevent the molten metal in the crucible 9 from rotating to form vortex when the impeller rotor 6 is stirred, and to intensify the oxidation and gas entrainment of the alloy liquid, a guide cylinder 7 is added outside the impeller rotor 6 and is not connected with the impeller rotor 6.

The side of the shell 10 is provided with a solvent quantitative supply system 4, and a liquid guide pipe of the solvent quantitative supply system 4 extends from the upper part of the shell 10 to the top of the crucible 9.

Aiming at the problem that the solvent dosage and the throwing speed are difficult to control when the solvent is manually sprinkled, a solvent quantitative supply system 4 is added into the device, so that the solvent throwing speed can be adjusted.

The top end of the shell 10 is provided with a lifting arm 11, and the top of the lifting arm 11 is connected with the cover plate 5.

In order to strengthen the protection of the alloy melt, a cover plate 5 is arranged, during refining, the cover plate 5 is covered, gas blown out through the center of a stirring head of an impeller rotor 6 floats out of the alloy melt and is forcibly blocked by the cover plate 5 (the partial pressure of magnesium alloy steam is higher than that of argon, the magnesium alloy steam is not covered by the cover plate, the argon is flushed by the magnesium alloy steam to be contacted with air), and the gas covers the surface of the alloy melt, so that the gas protection of the alloy melt is realized.

A mechanical rotary stirring and blowing treatment method for magnesium alloy melt comprises the following steps:

s1: after the alloy liquid is completely melted, the temperature of the melt is regulated to 780 ℃, the guide shell 7 and the impeller rotor 6 which are preheated to 500 ℃ are extended to 2/3 of the depth of the melt, the cover plate 5 is covered,

s2: starting the gas supply system 1, adjusting the flow of carbon dioxide gas to be 0.5L/min and the flow of argon gas to be 0.6L/min, starting the power system 3, adjusting the rotating speed of the impeller rotor 6 to be 100r/min, starting the solvent quantitative supply system 4, setting the solvent supply rate to be 100g/min, processing for 10min,

s3: after the melt is processed, the power system 3 is closed, then the solvent quantitative supply system 4 is closed, the gas supply system is closed, then the impeller rotor 6 is moved out,

s4: removing a slag layer on the surface of the melt, uniformly scattering a next layer of solvent A through a solvent quantitative supply system 4, adjusting the temperature to 780 ℃, preserving the temperature, standing for 10min, and then adjusting the temperature of the melt to 680 ℃ for pouring.

In the step S4, the solvent A is RJ-5.

Example 3:

as shown in fig. 1, a magnesium alloy melt mechanical rotation stirring jetting processing apparatus, includes a gas supply device 1, a gas mixing device 2, a power system 3, a cover plate 5, an impeller rotor 6, a draft tube 7, a gas guide tube 8, a crucible 9, and a housing 10, wherein, a gas outlet of the gas supply device 1 is connected with a gas inlet of the gas mixing device 2, a gas outlet of the gas mixing device 2 is connected with a gas inlet of the power system 3, a gas outlet of the power system 3 is fixedly connected with a gas inlet of the gas guide tube 8, the gas guide tube 8 penetrates through the top of the draft tube 7 and extends into the lower part of the draft tube 7, the gas guide tube 8 is fixedly connected with the top of the draft tube 7, the draft tube 7 is arranged at the lower part of the crucible 9, the gas outlet of the gas guide tube 8 is provided with the impeller rotor 6, the impeller rotor 6 is connected.

The gas supply device 1 supplies argon gas and carbon dioxide.

The power system 3 is a motor, the power system 3 is provided with a shaft, the power system 3 is coaxially connected with the impeller rotor 6 through the shaft, and the motor drives the impeller rotor 6 to rotate at a set rotating speed.

The stirring head of the impeller rotor 6 is 3 symmetrically distributed blades, and when the stirring head rotates, the blades can drive the alloy liquid to turn up and down.

In order to prevent the molten metal in the crucible 9 from rotating to form vortex when the impeller rotor 6 is stirred, and to intensify the oxidation and gas entrainment of the alloy liquid, a guide cylinder 7 is added outside the impeller rotor 6 and is not connected with the impeller rotor 6.

The side of the shell 10 is provided with a solvent quantitative supply system 4, and a liquid guide pipe of the solvent quantitative supply system 4 extends from the upper part of the shell 10 to the top of the crucible 9.

Aiming at the problem that the solvent dosage and the throwing speed are difficult to control when the solvent is manually sprinkled, a solvent quantitative supply system 4 is added into the device, so that the solvent throwing speed can be adjusted.

The top end of the shell 10 is provided with a lifting arm 11, and the top of the lifting arm 11 is connected with the cover plate 5.

In order to strengthen the protection of the alloy melt, a cover plate 5 is arranged, during refining, the cover plate 5 is covered, gas blown out through the center of a stirring head of an impeller rotor 6 floats out of the alloy melt and is forcibly blocked by the cover plate 5 (the partial pressure of magnesium alloy steam is higher than that of argon, the magnesium alloy steam is not covered by the cover plate, the argon is flushed by the magnesium alloy steam to be contacted with air), and the gas covers the surface of the alloy melt, so that the gas protection of the alloy melt is realized.

A mechanical rotary stirring and blowing treatment method for magnesium alloy melt comprises the following steps:

s1: after the alloy liquid is completely melted, the temperature of the melt is adjusted to 820 ℃, a guide cylinder 7 and an impeller rotor 6 which are preheated to 700 ℃ are extended to 2/3 of the depth of the melt, a cover plate 5 is covered,

s2: starting the gas supply system 1, regulating the flow of carbon dioxide gas to be 1.8L/min and the flow of argon gas to be 2.0L/min, starting the power system 3, adjusting the rotating speed of the impeller rotor 6 to be 300r/min, starting the solvent quantitative supply system 4, setting the solvent supply rate to be 1000g/min, processing for 30min,

s3: after the melt is processed, the power system 3 is closed, then the solvent quantitative supply system 4 is closed, the gas supply system is closed, then the impeller rotor 6 is moved out,

s4: removing a slag layer on the surface of the melt, uniformly scattering a layer of solvent A through a solvent quantitative supply system 4, adjusting the temperature to 820 ℃, keeping the temperature and standing for 50min, and then adjusting the temperature of the melt to 760 ℃ for pouring.

In the step S4, the solvent A is RJ-2.

The magnesium alloys prepared in examples 1 to 3 were tested with ZM5 magnesium alloy commercially available from Meta-magnesium industries according to GB/T228.1-2010, and the test results are shown in Table 1.

TABLE 1ZM5 magnesium alloy mechanical testing results

	Tensile strength (MPa)	Elongation (%)
			Example 1	277	15.1
Example 2	265	13.8
			Example 3	269	14.4
Commercial ZM5 alloy	217	12.7

As shown in Table 1, the tensile strength and elongation of the ZM5 magnesium alloy in the example are respectively improved by at least 18% and 8% compared with the prior art, which shows that the device and the method of the invention have positive effect on improving the quality of the magnesium alloy.

The working principle of the invention is as follows: when the magnesium alloy is smelted, the alloy liquid needs to be subjected to modification treatment. Formation of Al by reaction₄C₃The particles become crystal nuclei of the alloy, thereby realizing refinement of the alloy structure. The carbon dioxide and the magnesium-aluminum alloy can generate Al through reaction at high temperature₄C₃Particles.