A rotary stirring type rare earth metal smelting furnace and smelting method

Abstract

The present invention discloses a rotary stirring type rare earth metal smelting furnace. A smelting pot assembly is arranged inside the smelting furnace cavity for smelting rare earth metals. The side wall of the smelting furnace cavity is communicated with a vacuum pumping device and an air filling device arranged outside the smelting furnace cavity through pipelines. The vacuum pumping device, the air filling device, the smelting pot assembly and an external control cabinet are electrically connected. A detachable furnace cover is arranged above the smelting furnace cavity. A sealing airbag is arranged between the furnace cover and the smelting furnace cavity. The inside of the sealing airbag is filled with liquid. The furnace cover and the smelting furnace cavity are fixed through fixing parts. The liquid in the sealing airbag is vaporized by the temperature generated during the smelting process, increasing the volume and causing the sealing airbag to expand, thereby filling the gap between the furnace cover and the smelting furnace cavity. The sealing effect is good. And because the sealing airbag does not expand in advance, the assembly between the furnace cover and the smelting furnace cavity is simple and fast.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth smelting, and in particular to a rotary stirring type rare earth metal smelting furnace and a smelting method. Background Art

[0002] Rare earths are widely used in various traditional industries such as military, metallurgy, machinery, glass, ceramics, petroleum, chemical industry, electronics, textile, leather, agriculture and animal husbandry:

[0003] 1. In agriculture and forestry, rare earths can be used as plant growth regulators. In the aquaculture industry, they can be used as feed additives, generally using rare earth inorganic salts or rare earth organic complexes.

[0004] 2. In the military field, rare earths can be used to manufacture the tactical performance of steel, magnesium alloy, aluminum alloy, and titanium alloy for tanks, airplanes, and missiles.

[0005] 3. In the metallurgical industry, rare earths are widely used in machinery manufacturing such as automobiles, tractors, and diesel engines.

[0006] 4. In the field of glass and ceramics, rare earths are widely used in optical glass, picture tubes, spectacle lenses, glazed tiles, etc.

[0007] Among them, rare earth metal raw materials mainly include scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), etc. In the industrial and military fields, rare earth elements and non-rare earth elements (such as aluminum, magnesium, titanium, etc.) are used to obtain alloys containing rare earths with excellent mechanical properties and chemical properties through proportioning and smelting.

[0008] Currently, a smelting furnace is used to smelt rare earth metals and non-rare earth metals into alloy sheets, then hydrogenated into powder by a hydrogenation crusher, and finally the final alloy product is obtained through multiple processes such as a forming process and a pressing process. In order to prevent the gas in the air from affecting the molten liquid during the smelting process and forming oxides or pores during the cooling process, the existing rare earth smelting furnace injects a protective gas under a vacuum state, which reduces the quality problems of the alloy product caused by air during the smelting process while ensuring the pressure. Therefore, in the existing rare earth smelting process, the original smelting boiler (crucible) is placed in a large smelting furnace cavity, sealed with a furnace cover, and then evacuated and inflated inside. However, there are various sealing methods between the existing furnace cover and the smelting furnace cavity. When using rubber sealing for operation, it is relatively difficult to close and open. When a sealing sleeve is sleeved on the furnace cover, it is prone to deformation during the vacuum pumping and inflation process. At the same time, after multiple vacuum pumping and inflation operations, the sealing sleeve will fall off, resulting in poor sealing effect.

[0009] Secondly, during the smelting process, the molten liquid needs to be stirred. Most of the time, a mechanical stirring device is used, which is set on the furnace cover or a related stirring device inside the smelting furnace cavity. However, after the stirring rod of the stirring device finishes stirring, it still needs to rise out of the molten liquid. Therefore, in addition to the stirring function, the stirring device also needs to be equipped with components with rising and falling functions, which makes its structure relatively complex and the later maintenance cost high, being not conducive to actual production. Summary of the Invention

[0010] In order to solve the problems in the prior art that the sealing method between the furnace cover and the smelting furnace cavity is not convenient and the sealing effect is not ideal, and at the same time the structure of the molten liquid stirring device is complex, the present invention provides a rotary stirring type rare earth metal smelting furnace and a smelting method.

[0011] The technical solution of the present invention is as follows: A rotary stirring type rare earth metal smelting furnace includes a smelting furnace cavity. Inside the smelting furnace cavity, a smelting pot assembly and a stirring rod are arranged for smelting rare earth metals. The side wall of the smelting furnace cavity is connected through a pipeline with a vacuum pumping device and an air charging device arranged outside the smelting furnace cavity. The vacuum pumping device, the air charging device, the smelting pot assembly are electrically connected with an external control cabinet.

[0012] A detachable furnace cover is arranged above the smelting furnace cavity. A sealing airbag is arranged between the furnace cover and the smelting furnace cavity. The sealing airbag is filled with liquid. The furnace cover and the smelting furnace cavity are fixed through fixing parts. The stirring rod is composed of two mutually rotatable first single rods and second single rods. The first single rod passes through the furnace cover and is connected with a screw lift above the furnace cover. The screw lift is sealed with the furnace cover through a sealing ring and is electrically connected with the control cabinet. A stirring blade is arranged below the second single rod. An arc-shaped cover with a downward opening is arranged above the second single rod. The arc-shaped cover is provided with circumferentially arrayed inclined air outlets for collecting the hot air flow rising from the smelting pot assembly and flowing out through the inclined air outlets, thereby driving the rotation of the second single rod.

[0013] As a further improvement of the above technical solution:

[0014] Preferably, the smelting pot assembly includes a smelting boiler, a bracket, a tilting rod and a tilting motor. The smelting boiler is arranged in the middle of the bracket. A spiral resistance heating coil is arranged outside the smelting boiler. The resistance heating coil is electrically connected with an external control cabinet. One end of each of the two tilting rods is fixed and symmetrically arranged outside the bracket. The other end of one of the tilting rods is rotatably arranged on the inner wall of the smelting furnace cavity. The other tilting rod penetrates through the smelting furnace cavity and is connected with an external tilting motor. Rod sealing sleeves are arranged on the outer walls of the tilting rods and the smelting furnace cavity.

[0015] Preferably, a forming ingot mold is provided at the bottom of the smelting furnace cavity.

[0016] Preferably, the cross-section of the opening above the smelting furnace cavity is in a three-step shape. An internal thread is provided on the bottom step, which matches the thread on the side of the furnace cover, and the two are screwed together. The cross-section of the sealing airbag is in an L shape and is provided on the second step of the opening. The upper surface of the sealing airbag is lower than the upper surface of the smelting furnace cavity. The cross-section of the furnace cover is in a T shape and is provided on the upper surface of the sealing airbag and fixed by a fixing member provided on the upper surface of the smelting furnace cavity.

[0017] Preferably, the fixing member is any one of a box-type lock and a rotary buckle.

[0018] Preferably, flow guiding plates are provided at the outlets of the gas charging device and the vacuum pumping device inside the smelting furnace cavity. The outlet of the flow guiding plate is aligned with the arc-shaped cover, and the rotation speed of the arc-shaped cover is adjusted by changing the gas charging frequency.

[0019] Preferably, a camera and a temperature sensor electrically connected to the control cabinet are provided inside the smelting furnace cavity. The camera is used to observe the melting condition of the alloy metal and the rotation speed of the second single rod, and the temperature sensor is used to sense the feedback from the smelting pot assembly to the control cabinet.

[0020] Preferably, the volume ratio of the liquid in the sealing airbag to the internal volume of the sealing airbag is 1:1000 - 1500.

[0021] Preferably, a cable seal is provided on the outer wall of the smelting furnace cavity at the insertion point of the control cabinet and the smelting furnace cavity, and pipe fittings seals are provided on the outer wall of the smelting furnace cavity at the insertion points of the vacuum pumping device and the gas charging device and the smelting furnace cavity.

[0022] In order to fully demonstrate the operation process of the smelting furnace provided by the present invention, therefore, a smelting method of a rotary stirring type rare earth metal smelting furnace includes the following features:

[0023] Step1. Pre-match the rare earth metal and non-rare earth metal to be melted in advance, and place the matched amount in the smelting boiler. At the same time, cover the furnace cover on the opening of the smelting furnace cavity, tightly combine the two by threads, and then clamp or lock the upper surface of the furnace cover through the fixing member;

[0024] Step2. Energize the resistance heating coil through the control cabinet to ensure that the temperature is between 300°C and 400°C, preheat the internal rare earth metal and non-rare earth metal. At the same time, the liquid in the sealing airbag at the opening is vaporized due to the temperature rise, causing the sealing airbag to expand and fill the gap between the gap furnace cover and the smelting furnace cavity, thereby making the overall sealing better;

[0025] Step 3: Control the vacuum pumping device to start through the control cabinet, evacuate the inside of the melting furnace cavity. After reaching the set pressure, then control the gas charging device to charge the melting furnace cavity through the control cabinet. After reaching the set vacuum degree, perform the vacuum pumping operation again. After repeating the operation several times, reach the preset vacuum degree;

[0026] Step 4: The control cabinet controls the resistance heating coil to be energized, so that the melting boiler slowly heats up to the required temperature. At the same time, control the spiral elevator to rotate forward to drive the stirring rod to descend. During the melting process, the hot air rising from the melting boiler is collected by the arc-shaped cover and flows out through the inclined opening, thereby driving the rotation of the arc-shaped cover and driving the rotation of the second single rod, realizing the alloy melting and stirring in the melting boiler. If the rotation speed of the arc-shaped cover is too slow during the rotation process, repeat the vacuum pumping and gas charging steps in Step 3. On the premise of ensuring the vacuum degree, perform air flow interference on the arc-shaped cover to achieve the purpose of acceleration;

[0027] Step 5: After reaching the predetermined time, the control cabinet stops supplying power to the resistance heating coil until the second single rod stops moving. The spiral elevator flips to drive the stirring rod to rise, and then start the tilting motor to pour the alloy solution in the melting boiler into the forming ingot mold. After cooling, an alloy product is obtained.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. Through the temperature generated during the melting process, the liquid in the sealed airbag is vaporized, increasing the volume, causing the sealed airbag to expand, thereby filling the gap between the furnace cover and the melting furnace cavity. The sealing effect is good. And in order to prevent the furnace cover from being pushed open by the expansion of the sealed airbag, double fixation is set. One is: a threaded connection is adopted between the bottom of the furnace cover and the melting furnace cavity, which can avoid the up and down movement of the furnace cover under the extrusion of the sealed airbag and also avoid the left and right movement of the furnace cover. The other is: the fixing piece on the top of the furnace cover limits the top surface of the furnace cover, ensuring that the expansion of the sealed airbag will not have a great impact on the position of the furnace cover and can still achieve the sealing effect. And because the sealed airbag does not expand in front, the assembly between the furnace cover and the melting furnace cavity is simple and fast. After the sealed airbag expands, since the sealed airbag is located in the gap between the multi-fixed furnace cover and the fixed melting furnace cavity, the deformation amount can only deform within the gap, so that the gap can be fully filled to achieve good sealing.

[0030] 2. Divide the stirring rod into two single rods that rotate relative to each other. Above the single rod with stirring blades, there is an arc-shaped cover with an opening facing downwards. On the upper surface of the arc-shaped cover, there are circumferentially arranged inclined air outlets, which are mainly used to collect the rising hot air generated in the smelting boiler during the smelting process. By generating thrust through multiple inclined air outlets in the same direction, the movement of the single rod is driven, thereby realizing stirring. This method utilizes the original properties of the smelting boiler. Compared with traditional mechanical stirring, the structure is simpler and only requires the function of rising and falling. To avoid excessive speed, the guide plates at the inlets of the vacuum pumping device and the gas filling device correspond to the arc-shaped cover, and the arc-shaped cover can be decelerated by changing the airflow generated by vacuum pumping and gas filling. Conversely, if the rotation speed is too slow, it can be accelerated. Therefore, the operation is relatively stable during the stirring process. At the same time, due to the simplification of the stirring structure, the later maintenance difficulty and cost are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 is the overall structural schematic diagram of the present invention;

[0033] Figure 2 is Figure 1 the enlarged structural schematic diagram of Area A in

[0034] Figure 3 is the structural schematic diagram of the arc-shaped cover of the present invention.

[0035] Reference numerals: 1, smelting furnace cavity; 2, vacuum pumping device; 3, gas filling device; 4, control cabinet; 5, furnace cover; 6, sealing airbag; 7, liquid; 8, stirring rod; 9, screw elevator; 10, stirring blade; 11, arc-shaped cover; 12, inclined air outlet; 13, smelting boiler; 14, bracket; 15, tilting rod; 16, tilting motor; 17, resistance heating coil; 18, rod sealing sleeve; 19, forming ingot mold; 20, fixing member; 21, guide plate; 22, camera; 23, temperature sensor; 24, cable sealing member; 25, pipe fitting sealing member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. The technical solutions in the embodiments of the present invention can be combined, and the technical features in the embodiments can also be combined to form new technical solutions.

[0038] The present invention provides the following technical solutions:

[0039] As Figure 1 shown, this technical solution mainly consists of a melting furnace chamber 1 and a furnace cover 5.

[0040] As can be seen from the figure, a bracket 14 is arranged inside the melting furnace chamber 1. Two symmetrical tilting rods 15 are connected to both sides of the bracket 14. The other end of one tilting rod 15 is rotatably arranged on the inner wall of the melting furnace chamber 1, and the other end of the other tilting rod 15 passes through the melting furnace chamber 1 and is connected to an external tilting motor 16. The outer wall of the melting furnace chamber 1 is sealed by a rod seal sleeve 18 while ensuring the rotation of the tilting rod 15. A melting boiler 13 is inlaid on the middle upper surface of the bracket 14. A spiral resistance heating coil 17 is arranged inside the bracket 14 and is located around the outer wall of the melting boiler 13. Both ends of the resistance heating coil 17 are electrically connected to an external control cabinet 4. At the same time, a cable seal 24 is arranged at the wire insertion point of the control cabinet 4 insertion point. A forming ingot mold 19 is arranged at the bottom of the melting furnace chamber 1;

[0041] The side wall of the melting furnace chamber 1 is communicated with a vacuum pumping device 2 and an air filling device 3 arranged outside the melting furnace chamber 1 through pipelines. At the same time, a pipe seal 25 is arranged on the outer wall of the melting furnace chamber 1 at the insertion point. Flow guiding plates 21 are arranged at the outlets of the air filling device 3 and the vacuum pumping device 2 inside the melting furnace chamber 1. The outlets of the flow guiding plates 21 are aligned with the arc-shaped cover 11, and both the air filling device 3 and the vacuum pumping device 2 are electrically connected to the control cabinet 4;

[0042] Inside the melting chamber, a camera 22 and a temperature sensor 23 are also provided. Both the camera 22 and the temperature sensor 23 are electrically connected to the control cabinet 4 through transmission lines. At the same time, the transmission lines can be combined with the connection lines of the resistance heating coil 17 into a wire harness and penetrate through the same insertion point.

[0043] As can be seen from Figure 1 to Figure 3 It can be seen that the furnace lid 5 covers the upper outlet of the melting furnace chamber 1. A vertical downward screw lift 9 is provided on the upper surface of the furnace lid 5 through a sealing ring. The screw lift 9 is electrically connected to the control cabinet 4. The lower connecting rod of the screw lift 9 is connected to the stirring rod 8. The stirring rod 8 is composed of two mutually rotating first single rods and second single rods. The first single rod is connected to the screw lift 9. A stirring blade 10 is provided below the second single rod, and an arc-shaped cover 11 with an opening downward is provided above the second single rod. As shown in Figure 3 As shown, the arc-shaped cover 11 is provided with circumferentially arranged inclined air outlets 12 for collecting the hot air flowing upward from the melting pot assembly and flowing out through the inclined air outlets 12, thereby driving the rotation of the second single rod. The generation of the inclined air outlets 12 can be clearly seen from the attached drawings. The arc-shaped cover 11 is mainly composed of two connecting rings with different diameters up and down. The upper connecting ring is used to connect with the stirring rod 8. Inclined circular arc-shaped sheets are provided between the two connecting rings. At the same time, the circular arc-shaped sheets are circumferentially arranged and there is partial stacking between adjacent circular arc-shaped sheets. The circular arc-shaped sheets and the connecting rings are connected by welding. Because the circular arc-shaped sheets are inclined and the stacking between adjacent ones forms the inclined air outlets 12, after the hot air enters the arc-shaped cover 11, it diffuses toward the circular arc-shaped sheets. It flows out from the inclined air outlets formed by adjacent circular arc-shaped sheets, thereby forming a thrust. The directions of multiple inclined air outlets are the same, and the hot air is ejected in one direction, forming a rotational thrust, which can drive the rotation of the second single rod.

[0044] As shown in Figure 2As shown in the figure, the cross-section of the opening above the melting furnace chamber 1 is in a three-step shape. There is an internal thread on the bottom step, which matches the thread on the side of the furnace cover 5, and the two are screwed together. The cross-section of the sealing airbag 6 is in an L shape and is arranged on the second step of the opening. The upper surface of the sealing airbag 6 is lower than the upper surface of the melting furnace chamber 1. The cross-section of the furnace cover 5 is in a T shape and is arranged on the upper surface of the sealing airbag 6 and is fixed by the fixing member 20 arranged on the upper surface of the melting furnace chamber 1. The fixing member can be a box-type lock and a rotary buckle. An appropriate amount of liquid 7 is filled in the sealing airbag 6. According to different liquids 7, the ratio between the volume of the liquid 7 and the internal volume of the sealing airbag 6 should be 1:1000 - 1500. For example, when the liquid 7 is water, the volume of water increases by 1244.44 times after vaporization. At this time, if the ratio is 1:1244.44, the water vapor will just fill the sealing airbag 6 without deformation. Therefore, the ratio should be appropriately increased, such as 1:1220, etc. Different injection amounts need to be selected according to different liquids 7.

[0045] The using process of the present invention:

[0046] 1. First, proportion the rare earth metals and non-rare earth metals that need to be melted in advance, and place the proportioned amount in the melting boiler 13. At the same time, cover the furnace cover 5 on the opening of the melting furnace chamber 1 and tightly combine the two through the thread. Then, clamp or lock the upper surface of the furnace cover 5 through the fixing member 20 to double-fix the furnace cover 5. The main reason is that after the sealing airbag 6 expands, the melting furnace chamber 1 will not be affected by the extrusion force after the deformation of the sealing airbag 6. However, due to the weight and volume of the furnace cover 5, the furnace cover 5 may be popped open due to the deformation of the sealing airbag 6. Therefore, fixing the lower end of the furnace cover 5 on the left and right and limiting the upper end can prevent the furnace cover 5 from opening and closing under the action of the deformation force of the sealing airbag 6, and at the same time is conducive to the airbag completely blocking the gap between the furnace cover 5 and the melting furnace chamber 1 after deformation. Therefore, the cross-section of the opening is set in a three-step shape instead of a two-step shape. The main purpose is to fill the gaps on both sides of the furnace cover 5, and the sealing effect is better, compared with the direct stacking of the furnace cover 5 and the sealing airbag 6, because the direct stacking will leak the gap outside the furnace cover 5 and the sealing airbag 6;

[0047] 2. Energize the resistance heating coil 17 through the control cabinet 4 to ensure that the temperature is between 300°C and 400°C, preheat the internal rare earth metals and non-rare earth metals. At the same time, the liquid 7 in the sealing airbag 6 at the opening vaporizes due to the temperature rise, causing the sealing airbag 6 to expand and fill the gap between the gap furnace cover 5 and the melting furnace cavity 1. Thus, compared with directly using a sealing rubber for sealing, the assembly difficulty in the early stage is smaller. Because directly using a sealing rubber for sealing requires a large amount of force to be extruded to be assembled together, but in the present invention, since the airbag of the furnace cover 5 is in a deformable state before heating in the early stage, it will not affect the assembly of the furnace cover 5, and the assembly is easy, and at the same time, the sealing effect is also relatively good;

[0048] 3. Start the vacuum pumping device 2 through the control cabinet 4 to evacuate the inside of the melting furnace cavity 1. After reaching the set pressure, then control the gas filling device 3 through the control cabinet 4 to fill the melting furnace cavity 1 with gas. After reaching the set vacuum degree, perform the vacuum pumping operation again. Repeat the operation several times to reach the preset vacuum degree;

[0049] 4. The control cabinet 4 controls the resistance heating coil 17 to be energized, so that the melting boiler 13 slowly heats up to the required temperature. At the same time, control the spiral elevator 9 to rotate forward to drive the stirring rod 8 to descend. During the melting process, the hot air rising from the melting boiler 13 is collected by the arc-shaped cover 11 and flows out from the inclined opening, thereby driving the rotation of the arc-shaped cover 11 and driving the rotation of the second single rod, realizing the alloy melting and stirring in the melting boiler 13. Compared with the existing mechanical stirring method, which requires the assembly of a lifting component and a rotating component, in the presence of the arc-shaped cover 11, only the lifting component is needed, reducing the structural complexity of the stirring device. At the same time, it is more convenient for later maintenance and the cost is correspondingly reduced. Through the video signal transmitted by the camera 22, observe whether the rotation speed of the second single rod is appropriate. If the speed of the arc-shaped cover 11 is too slow during the rotation process, repeat the vacuum pumping and gas filling steps in 3. On the premise of ensuring the vacuum degree, perform air flow interference on the arc-shaped cover 11 to achieve the purpose of acceleration. On the contrary, deceleration can be carried out, and specific adjustments are made according to the actual situation;

[0050] 5. After reaching the predetermined time and seeing the melting situation through the signal transmitted by the camera 22, the control cabinet 4 stops supplying power to the resistance heating coil 17 until the second single rod stops moving. The spiral elevator 9 flips to drive the stirring rod 8 to rise, and then start the tilting motor to pour the alloy solution in the melting boiler 13 into the forming ingot mold 19. After cooling, an alloy product is obtained.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary stirring type rare earth metal smelting furnace, comprising a smelting furnace chamber (1). Inside the smelting furnace chamber (1), there are arranged a smelting pot assembly and a stirring rod (8). The side wall of the smelting furnace chamber (1) is communicated with a vacuum pumping device (2) and an air filling device (3) arranged outside the smelting furnace chamber (1) through pipelines. The vacuum pumping device (2), the air filling device (3), the smelting pot assembly are electrically connected to an external control cabinet (4). It is characterized in that: Above the smelting furnace chamber (1), there is a detachable furnace cover (5). Between the furnace cover (5) and the smelting furnace chamber (1), there is a sealing airbag (6). Inside the sealing airbag (6), there is filled with a liquid (7). Between the furnace cover (5) and the smelting furnace chamber (1), they are fixed through a fixing member (20). The stirring rod (8) is composed of two mutually rotatable first single rods and a second single rod. The first single rod passes through the furnace cover and is connected to a screw elevator (9) above the furnace cover (5). Between the screw elevator (9) and the furnace cover (5), there is a seal through a sealing ring and it is electrically connected to the control cabinet (4). Below the second single rod, there is a stirring blade (10). Above the second single rod, there is an arc-shaped cover (11) with an opening downward. On the arc-shaped cover (11), there are arranged circumferentially arrayed inclined air outlets (12) for collecting the hot air flow rising from the smelting pot assembly and flowing out through the inclined air outlets (12), thereby driving the rotation of the second single rod; The cross-section of the upper opening of the smelting furnace chamber (1) is in a three-step shape. On the bottom step, there is an internal thread, which is matched with the thread on the side surface of the furnace cover (5). The cross-section of the sealing airbag (6) is in an L shape and is arranged on the second step of the opening. The upper surface of the sealing airbag (6) is lower than the upper surface of the smelting furnace chamber (1). The cross-section of the furnace cover (5) is in a T shape and is arranged on the upper surface of the sealing airbag (6) and is fixed through a fixing member (20) arranged on the upper surface of the smelting furnace chamber (1); At the outlets of the air filling device (3) and the vacuum pumping device (2) inside the smelting furnace chamber (1), there are both arranged flow guiding plates (21). The outlets of the flow guiding plates (21) are aligned with the arc-shaped cover (11), and the rotation speed of the arc-shaped cover (11) is adjusted by changing the inflation frequency.

2. The rotary stirring type rare earth metal smelting furnace according to claim 1, wherein: The smelting pot assembly includes a smelting boiler (13), a bracket (14), tilting rods (15) and a tilting motor (16). In the middle of the bracket (14), there is a smelting boiler (13). Outside the smelting boiler (13), there is a spiral resistance heating coil (17). The resistance heating coil (17) is electrically connected to an external control cabinet (4). One ends of the two tilting rods (15) are fixed and symmetrically arranged outside the bracket (14). The other end of one of the tilting rods (15) is rotatably arranged on the inner wall of the smelting furnace chamber (1). The other tilting rod (15) passes through the smelting furnace chamber (1) and is connected to an external tilting motor (16). On the outer walls of the tilting rods (15) and the smelting furnace chamber (1), there are rod sealing sleeves (18).

3. The rotary stirring rare earth metal smelting furnace according to claim 1 or 2, characterized in that: At the bottom of the smelting furnace chamber (1), there is a forming ingot mold (19).

4. The rotary stirring type rare earth metal melting furnace according to claim 3, characterized in that: The fixing member (20) is any one of a box-type lock and a rotary buckle.

5. The rotary stirring type rare earth metal smelting furnace according to claim 4, characterized in that: A camera (22) and a temperature sensor (23) electrically connected to the control cabinet (4) are arranged inside the melting furnace chamber (1). The camera (22) is used to observe the melting condition of the alloy metal and the rotation speed of the second single rod, and the temperature sensor (23) is used to sense the feedback from the melting pot assembly to the control cabinet (4).

6. The rotary stirring type rare earth metal melting furnace according to claim 4, characterized in that: The volume ratio of the liquid (7) in the sealing airbag (6) to the internal volume of the sealing airbag (6) is 1:1000 - 1500.

7. The rotary stirring type rare earth metal melting furnace according to claim 4, wherein: A cable seal (24) is arranged on the outer wall of the melting furnace chamber (1) at the insertion point of the control cabinet (4) and the melting furnace chamber (1), and a pipe seal (25) is arranged on the outer wall of the melting furnace chamber (1) at the insertion point of the vacuum pumping device (2) and the gas charging device (3) and the melting furnace chamber (1).

8. A smelting method for a rotary stirring rare earth metal smelting furnace, using the rotary stirring rare earth metal smelting furnace as described in any one of claims 5 to 7, characterized in that, It includes the following features: Step1: Pre-match the rare earth metal and non-rare earth metal to be melted in advance, and place the matched amount in the melting boiler (13). At the same time, cover the furnace cover (5) on the opening of the melting furnace chamber (1), and tightly combine the two by threads. Then, use the fixing member (20) to clamp or lock the upper surface of the furnace cover (5). Step2: Energize the resistance heating coil (17) through the control cabinet (4) to ensure that the temperature is between 300°C and 400°C, and preheat the internal rare earth metal and non-rare earth metal. At the same time, the liquid (7) in the sealing airbag (6) at the opening is vaporized due to the temperature rise, causing the sealing airbag (6) to expand and fill the gap between the split furnace cover (5) and the melting furnace chamber (1), thereby making the overall sealing performance better. Step3: Start the vacuum pumping device (2) through the control cabinet (4) to evacuate the inside of the melting furnace chamber (1). After reaching the set pressure, then control the gas charging device (3) through the control cabinet (4) to charge the melting furnace chamber (1). After reaching the set pressure, perform the vacuum pumping operation again. Repeat the operation several times until the set pressure is reached. Step4: The control cabinet (4) controls the resistance heating coil (17) to be energized, so that the melting boiler (13) slowly heats up to the required temperature. At the same time, control the spiral elevator (9) to rotate forward to drive the stirring rod (8) to descend. During the melting process, the hot air rising from the melting boiler (13) is collected by the arc-shaped cover (11) and flows out through the inclined opening, thereby driving the rotation of the arc-shaped cover (11) and driving the rotation of the second single rod, realizing the alloy melting and stirring in the melting boiler (13). If the speed of the arc-shaped cover (11) is too slow during the rotation process, repeat the vacuum pumping and gas charging steps in Step3, and interfere with the air flow of the arc-shaped cover (11) under the premise of ensuring the pressure to achieve the purpose of acceleration. Step 5. After reaching the predetermined time, the control cabinet (4) stops supplying power to the resistance heating coil (17) until the second single rod stops moving. The screw lift (9) flips to drive the stirring rod (8) to rise, and then the tilting motor is started to pour the alloy solution in the smelting boiler (13) into the forming ingot mold (19). After cooling, an alloy product is obtained.

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