A melting device for sintered NdFeB permanent magnetic materials

Abstract

The present invention discloses a melting device for sintered neodymium iron boron permanent magnet materials, which relates to the technical field of melting of neodymium iron boron permanent magnet materials and includes: a melting tank, a melting assembly and a feeding assembly; the melting assembly includes a heating assembly arranged inside the melting tank, and a stirring assembly is arranged at the bottom end of the heating assembly; the feeding assembly includes a pushing assembly arranged at the top end of the melting tank, and a recycling assembly is arranged on the side of the pushing assembly; the recycling assembly includes a recycling part, a condensation part and a material returning part, the recycling part is connected to the condensation part through a pipeline, and the bottom end of the condensation part is fixedly connected with the material returning part; the stirring assembly further includes a piston part, a driving part and an adjusting part, the bottom end of the piston part is fixedly connected with the driving part, and the bottom end of the driving part is fixedly connected with the adjusting part. The present invention can ensure uniform distribution of the melting temperature and recycle neodymium vapor, improving the melting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of smelting of neodymium iron boron permanent magnet materials, and particularly to a smelting device for sintered neodymium iron boron permanent magnet materials. Background Art

[0002] Due to its excellent magnetic properties and broad application prospects, neodymium iron boron permanent magnet materials have been widely used in fields such as electronics, electric motors, and new energy vehicles. The production process of this material includes multiple links such as alloy smelting, powder preparation, forming, sintering, and subsequent magnetic property adjustment. Among them, the smelting process is an important step that determines the final material properties.

[0003] Existing smelting equipment usually adopts induction heating. However, during the smelting process, as the neodymium iron boron alloy block gradually melts, the flow of its liquid part and solid part is not smooth, and heat cannot be evenly distributed, resulting in alloy composition segregation, reducing the smelting effect. At the same time, during the smelting process, neodymium vapor is easily generated, and there is a lack of an effective gas recovery and treatment system, resulting in the volatilization of neodymium vapor, causing raw material loss and reducing resource utilization rate. Summary of the Invention

[0004] The purpose of the present invention is to provide a smelting device for sintered neodymium iron boron permanent magnet materials, which solves the problems that the smelting temperature cannot be evenly distributed and neodymium vapor cannot be recycled, reducing the smelting effect.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A smelting device for sintered neodymium iron boron permanent magnet materials, comprising: a smelting tank, a smelting component, and a feeding component;

[0007] The smelting component includes a heating component arranged inside the smelting tank, and a stirring component is arranged at the bottom end of the heating component; the stirring component includes at least two connecting plates, an electromagnetic induction coil is fixedly connected to the side surface of the connecting plate, and at least two connecting plates can move towards each other or away from each other;

[0008] The feeding component includes a pushing component arranged at the top end of the smelting tank, and a recycling component is arranged on the side surface of the pushing component; the recycling component is used for recycling neodymium vapor and converting the energy of the neodymium vapor into kinetic energy for pushing two connecting plates to move away from each other.

[0009] The recycling component includes a recycling part, a condensation part, and a return material part. The recycling part is connected to the condensation part through a pipeline, and the return material part is fixedly connected to the bottom end of the condensation part;

[0010] The stirring component further includes a piston part, a driving part, and an adjusting part. The piston part is fixedly connected to the bottom end of the driving part, and the driving part is fixedly connected to the bottom end of the adjusting part.

[0011] The recovery part includes an air inlet pipe and an air cylinder. The air inlet pipe is fixedly connected to the top end of the smelting tank, and the air inlet pipe is communicated with the air cylinder.

[0012] The condensation part includes a recovery pipe and a buffer box. The side of the air cylinder is fixedly connected to the recovery pipe, the recovery pipe is communicated with the buffer box, a return pipe is fixedly connected to the bottom end of the buffer box, a condensation pipe is arranged below the return pipe, and a plurality of the condensation pipes are communicated with each other through pipes.

[0013] The return part includes a recovery tank and a connecting pipe. The inside of the recovery tank is fixedly connected to the condensation pipe, the bottom end of the recovery tank is fixedly connected to the connecting pipe, and the connecting pipe is communicated with the smelting tank.

[0014] The piston part includes a piston rod and a first rack plate. The piston rod is slidably connected to the inside of the air cylinder, and the bottom end of the piston rod is fixedly connected to the first rack plate.

[0015] The driving part includes a rotating gear, a second rack plate and an adjusting plate. The first rack plate is meshed with the rotating gear, the rotating gear is meshed with the second rack plate, and the bottom end of the second rack plate is fixedly connected with an adjusting plate.

[0016] The adjusting part includes a slip ring rod, a fixed rod, a rotating plate and a molybdenum cylinder. The top end of the adjusting plate is fixedly connected to the slip ring rod, the slip ring rod is slidably connected to the inside of the fixed rod, the top end of the fixed rod is fixedly connected with a molybdenum cylinder, the two sides of the top end of the slip ring rod are rotatably connected with rotating plates, and the side surface of the rotating plate is rotatably connected with a connecting plate.

[0017] Preferably, the smelting assembly includes a heating assembly, and the stirring assembly is used for stirring the neodymium iron boron alloy block in the heating assembly.

[0018] The heating assembly includes a smelting pot and an induction heating coil. The smelting pot is arranged at the top end of the molybdenum cylinder, and the induction heating coil is arranged on the surface of the smelting pot.

[0019] Preferably, the bottom end of the electromagnetic induction coil is slidably connected to the molybdenum cylinder.

[0020] Preferably, a plurality of the condensation pipes are communicated with each other through pipes.

[0021] Preferably, a one-way valve is arranged on the side surface of the connecting pipe.

[0022] Preferably, the feeding assembly includes a pushing assembly, and the recovery assembly is used for recycling the neodymium vapor in the heating assembly.

[0023] The pusher assembly includes: a feed pipe and a push rod. The feed pipe is fixedly connected to the top end of the melting tank. Above the feed pipe, a telescopic cylinder is provided. The telescopic end of the telescopic cylinder is fixedly connected to the push rod. The top end of the feed pipe is fixedly connected to a material conveying pipe. Inside the material conveying pipe, a material conveying box is slidably connected. The bottom end of the material conveying box is rotatably connected to a rotating plate. One side of the material conveying box is fixedly connected to the push rod.

[0024] Preferably, a water-cooled jacket is provided between the inside of the melting tank and the melting pot.

[0025] Preferably, a spring is fixedly connected between the inside of the air cylinder and the piston rod.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] During the melting process, the neodymium iron boron alloy block is placed into the pusher assembly of the feeding assembly. Subsequently, the pusher assembly puts the neodymium iron boron alloy block into the heating assembly. The heating assembly starts to melt the neodymium iron boron alloy block through induction heating. As time goes by, the neodymium iron boron alloy block begins to change from solid to liquid, and at the same time, neodymium vapor is generated. The neodymium vapor flows upward into the intake pipe, so that the neodymium vapor enters the air cylinder through the intake pipe to push the piston rod downward to compress the spring and contract. Then, the piston rod pushes the rotating gear downward through the first rack plate to rotate. The rotating gear drives the adjusting plate to move upward through the second rack plate, so that the adjusting plate drives the electromagnetic induction coil to move toward the inner wall of the molybdenum cylinder through the slip ring rod, increasing the range of agitation of the electromagnetic induction coil through the alternating magnetic field, ensuring that the neodymium iron boron alloy block has a uniform temperature distribution during the entire melting process. Therefore, the problem of uneven temperature distribution during the melting process and the reduction of the melting effect is solved; when the neodymium vapor pushes the piston rod to a certain position, the neodymium vapor enters the buffer box through the recovery pipe. Subsequently, the neodymium vapor slowly enters the recovery tank through the return pipe, and the condensing pipe condenses the neodymium vapor through cold air. Then, the neodymium vapor begins to condense into neodymium solid, and the neodymium solid flows into the melting pot through the connecting pipe to be melted together with the neodymium iron boron alloy block, enabling the recovery and utilization of neodymium vapor and improving the resource utilization rate. Description of the Drawings

[0028] 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 also be obtained based on these drawings.

[0029] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0030] Figure 1 It is a schematic diagram of the overall structure of a melting device for a sintered neodymium iron boron permanent magnet material of the present invention;

[0031] Figure 2 It is a schematic sectional view of components such as a recovery pipe, a buffer box, and a return pipe in a melting device for a sintered neodymium iron boron permanent magnet material of the present invention;

[0032] Figure 3 It is a schematic diagram of the structures of components such as a first rack plate, a rotating gear, and a second rack plate in a melting device for a sintered neodymium iron boron permanent magnet material of the present invention;

[0033] Figure 4 It is a schematic sectional view of components such as a recovery tank, a condensation pipe, and a connecting pipe in a melting device for a sintered neodymium iron boron permanent magnet material of the present invention;

[0034] Figure 5 It is Figure 2 a partial enlarged structural schematic diagram at position A in

[0035] Figure 6 It is Figure 2 a partial enlarged structural schematic diagram at position B in

[0036] Illustration: 1. Melting tank; 2. Melting assembly; 3. Feeding assembly; 4. Check valve; 5. Water-cooled jacket; 6. Discharge pipe;

[0037] 210. Heating assembly; 211. Melting pot; 212. Induction heating coil;

[0038] 220. Stirring assembly; 221. First rack plate; 222. Rotating gear; 223. Second rack plate; 224. Adjusting plate; 225. Slip ring rod; 226. Fixed rod; 227. Molybdenum cylinder; 228. Rotating plate; 229. Connecting plate; 230. Electromagnetic induction coil;

[0039] 310. Pushing assembly; 311. Feeding pipe; 312. Telescopic cylinder; 313. Pushing rod; 314. Feeding pipe; 315. Feeding box; 316. Rotating plate;

[0040] 320. Recycling component; 321. Intake pipe; 322. Air cylinder; 323. Piston rod; 324. Recovery pipe; 325. Buffer box; 326. Return pipe; 327. Recovery tank; 328. Condensing pipe; 329. Connecting pipe. Detailed implementation manner

[0041] To make the invention objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all 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.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present at the same time.

[0043] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation manners.

[0044] The melting device for sintered neodymium iron boron permanent magnet material uses the Lorentz force generated by electromagnetic induction to suspend the metal, so that it is melted in a containerless environment, avoiding crucible contamination and improving the material purity. It is mainly applied to high-end electronic devices, medical equipment, laboratory research, and the production of high-performance magnetic materials. The neodymium iron boron permanent magnet material is a rare earth permanent magnet material composed of neodymium, iron, boron, and other trace elements, and has an extremely high magnetic energy product, and is one of the permanent magnet materials with the best performance at present.

[0045] Reference Figure 1 - Figure 6 As shown in the figure, the embodiment of the present invention provides a melting device for sintered neodymium iron boron permanent magnet material, including: a melting tank 1, a melting component 2, and a feeding component 3;

[0046] The melting component 2 includes a heating component 210 arranged inside the melting tank 1, and a stirring component 220 is arranged at the bottom of the heating component 210; the stirring component 220 includes at least two connecting plates 229, an electromagnetic induction coil 230 is fixedly connected to the side surface of the connecting plate 229, and at least two connecting plates 229 can move towards each other or move away from each other;

[0047] The feeding assembly 3 includes a pusher assembly 310 disposed at the top end of the melting tank 1, and a recovery assembly 320 is disposed on the side of the pusher assembly 310; the recovery assembly 320 is used to recover neodymium vapor and convert the energy of the neodymium vapor into kinetic energy for pushing two connecting plates 229 to move away from each other.

[0048] The recovery assembly 320 includes a recovery part, a condensation part and a material return part. The recovery part is connected to the condensation part by a pipeline, and the bottom end of the condensation part is fixedly connected to the material return part;

[0049] The stirring assembly 220 further includes a piston part, a driving part and an adjusting part. The bottom end of the piston part is fixedly connected to the driving part, and the bottom end of the driving part is fixedly connected to the adjusting part.

[0050] The melting assembly 2 is used for melting neodymium iron boron alloy blocks; the heating assembly 210 is mainly used for induction heating of neodymium iron boron alloy blocks; the stirring assembly 220 is used for electromagnetic stirring of neodymium iron boron alloy blocks in the heating assembly 210; the feeding assembly 3 is mainly used for feeding the melting tank 1; the pusher assembly 310 is used for putting neodymium iron boron alloy block materials into the melting pot 211; the recovery assembly 320 is used for recycling the neodymium vapor generated by heating the neodymium iron boron alloy blocks;

[0051] Put the neodymium iron boron alloy block into the pusher assembly 310, and then the pusher assembly 310 pushes the neodymium iron boron alloy block into the heating assembly 210. Then, the heating assembly 210 inductively heats the neodymium iron boron alloy block through an alternating magnetic field, and thus the melting starts. During the melting process, neodymium vapor is generated. Then, the neodymium vapor starts to rise upward into the recovery part of the recovery assembly 320. The recovery assembly 320 drives the piston part of the stirring assembly 220 to move downward through the neodymium vapor, so that the piston part drives the driving part to move upward. Then, the driving part drives the electromagnetic induction coil to slide towards the inner side wall of the molybdenum cylinder through the adjusting part, thereby expanding the range and stirring the melting iron boron alloy block. At the same time, the recovery assembly 320 condenses the collected neodymium vapor, converts it into neodymium metal solid, and adds it into the heating assembly 210 to melt together with the iron boron alloy block.

[0052] During the smelting process, the neodymium iron boron alloy block is located in the pusher assembly 310. The pusher assembly 310 transports the neodymium iron boron alloy block into the heating assembly 210. The heating assembly 210 heats the neodymium iron boron alloy block through an alternating magnetic field induction, so that the neodymium iron boron alloy block is smelted into a melt. At the same time, the stirring assembly 220 stirs the iron boron alloy block being smelted through an alternating magnetic field. The neodymium vapor generated during the smelting process enters the recovery assembly 320. The recovery assembly 320 expands the stirring range of the stirring assembly 220 through the neodymium vapor. Therefore, it can solve the problem that the temperature cannot be evenly distributed during the smelting process and reduce the smelting effect. On the other hand, the recovery assembly 320 condenses the neodymium vapor and converts it into neodymium metal solids to be smelted together with the iron boron alloy block. Therefore, it can solve the problem that the neodymium vapor cannot be recycled and reduce the resource utilization rate.

[0053] Reference Figure 2 As shown, the smelting assembly 2 includes a heating assembly 210, and the stirring assembly 220 is used to stir the neodymium iron boron alloy block in the heating assembly 210;

[0054] The heating assembly 210 includes: a smelting pot 211 and an induction heating coil 212. The smelting pot 211 is arranged at the top of the molybdenum cylinder 227, and the induction heating coil 212 is arranged on the surface of the smelting pot 211.

[0055] During the process of smelting the neodymium iron boron alloy block, the induction heating coil 212 is connected to an external power supply. The external power supply is turned on to control the induction heating coil 212 to start operating, so that the induction heating coil 212 starts to generate an alternating magnetic field to heat the smelting pot 211. Subsequently, the smelting pot 211 transfers the heat to the neodymium iron boron alloy block inside it for smelting. At the same time, cold water is injected into the water-cooled jacket 5 to prevent the smelting tank 1 from being damaged by high temperature.

[0056] Reference Figure 1 、 Figure 2 、 Figure 3 And Figure 4 As shown, the recovery part includes: an air inlet pipe 321 and an air cylinder 322. The air inlet pipe 321 is fixedly connected to the top of the smelting tank 1, and the air inlet pipe 321 is communicated with the air cylinder 322;

[0057] The condensation part includes a recovery pipe 324 and a buffer box 325. The side of the air cylinder 322 is fixedly connected to the recovery pipe 324. The recovery pipe 324 communicates with the buffer box 325. The bottom end of the buffer box 325 is fixedly connected to a return pipe 326. A condensation pipe 328 is arranged below the return pipe 326. Multiple condensation pipes 328 are interconnected through pipes. Neodymium vapor can be effectively guided to the condensation part during the smelting process. Cold air in the condensation part flows into the condensation pipe 328, and the neodymium vapor is quickly condensed into solid neodymium metal through low-temperature cooling, thus greatly improving the recovery efficiency of neodymium metal. After condensation, the neodymium metal flows into the recovery tank 327 through the return pipe 326, ensuring condensation while avoiding waste of resources. The solid neodymium metal in the recovery tank 327 is finally re-introduced into the smelting pot 211 to participate in the alloy smelting process, forming a closed-loop cycle, greatly improving the resource utilization rate of neodymium. Compared with existing smelting devices, the condensation part optimizes the gas condensation process, not only enabling efficient recovery of neodymium vapor, but also effectively reducing the volatilization loss of neodymium, improving the environmental protection performance of the equipment. The design of the condensation part ensures the temperature uniformity of the NdFeB alloy block during the smelting process, while avoiding waste of neodymium vapor, providing sufficient neodymium metal support for the subsequent smelting process, thereby improving the overall smelting efficiency and product quality.

[0058] The return part includes a recovery tank 327 and a connecting pipe 329. The interior of the recovery tank 327 is fixedly connected to the condensation pipe 328. The bottom end of the recovery tank 327 is fixedly connected to the connecting pipe 329. The connecting pipe 329 communicates with the smelting tank 1.

[0059] During the smelting process of the NdFeB alloy block, the condensation pipe 328 is connected to an external air conditioner. The generated neodymium vapor flows upward into the intake pipe 321, and then through the intake pipe 321 into the air cylinder 322 to push the piston rod 323 downward to compress the spring, causing the spring to contract. When the piston rod 323 moves downward to a certain position in the air cylinder 322, the neodymium vapor flows into the buffer box 325 through the recovery pipe 324 for buffering. Then the neodymium vapor slowly flows into the recovery tank 327 through the buffer box 325. Subsequently, the external air conditioner is started to fill the condensation pipe 328 with low-temperature cold air, causing the neodymium vapor to condense into solid neodymium metal in the recovery tank 327. Then the one-way valve 4 is opened, and the solid neodymium metal in the recovery tank 327 flows into the smelting pot 211 through the connecting pipe 329 to be smelted together with the FeB alloy block.

[0060] Reference Figure 2 、 Figure 3 and Figure 5 As shown in, the piston part includes a piston rod 323 and a first rack plate 221. The interior of the air cylinder 322 is slidably connected to the piston rod 323. The bottom end of the piston rod 323 is fixedly connected to the first rack plate 221.

[0061] The driving part includes: a rotating gear 222, a second rack plate 223 and an adjusting plate 224, the first rack plate 221 is meshed with the rotating gear 222, the rotating gear 222 is meshed with the second rack plate 223, and the bottom end of the second rack plate 223 is fixedly connected with the adjusting plate 224;

[0062] The adjusting part comprises a slip ring rod 225, a fixed rod 226, a rotating plate 228 and a molybdenum tube 227. The top of the adjusting plate 224 is fixedly connected to the slip ring rod 225. The inside of the slip ring rod 225 is slidably connected to the fixed rod 226. The top of the fixed rod 226 is fixedly connected to the molybdenum tube 227. The rotating plates 228 are rotatably connected to the two sides of the top of the slip ring rod 225. The side of the rotating plate 228 is rotatably connected to the connecting plate 229. The sliding connection between the slip ring rod 225 and the fixed rod 226 in the adjusting part enables the adjusting plate 224 to push the electromagnetic induction coil 230 to slide toward the inner wall of the molybdenum tube 227 under precise control, thereby ensuring the optimal matching of the magnetic field strength and the heating efficiency. Compared with traditional technology, this adjustment mechanism can effectively avoid the problem of uneven temperature distribution and ensure that the alloy block will not have unstable performance due to local overheating or overcooling during the smelting process. In addition, the design of the adjustment part also ensures the stability and efficiency of the entire equipment during long-term operation, avoiding the wear or position displacement of mechanical parts due to high smelting temperature, which will cause performance degradation.

[0063] When the piston rod 323 presses the spring downward, the electromagnetic induction coil 230 is connected to an external power source, and the external power source is turned on. The external power source controls the electromagnetic induction coil 230 to operate, so that the electromagnetic induction coil 230 generates an interactive magnetic field to stir the NdFeB alloy block being melted in the smelting pot 211, and the piston rod 323 drives the first rack plate 221 to move downward, so that the first rack plate 221 drives the rotating gear 222 to rotate through meshing, so that the second rotating gear 222 drives the second rack plate 223 to move upward through meshing, so that the second rack plate 223 drives the adjusting plate 224 to move upward, and then the adjusting plate 224 pushes the slip ring rod 225 upward to slide on the fixed rod 226, so that the slip ring rod 225 pushes the rotating plate 228 upward to rotate on the connecting plate 229, and then the rotating plate 228 drives the connecting plate 229 to move in reverse, thereby pushing the electromagnetic induction coil 230 to slide toward the inner wall of the molybdenum cylinder 227, thereby expanding the stirring range.

[0064] refer to Figure 1 , Figure 2 and Figure 6 As shown, the feed assembly 3 includes a push assembly 310, and the recovery assembly 320 is used to recover and utilize the neodymium vapor in the heating assembly 210;

[0065] The pusher assembly 310 includes: a feed pipe 311 and a push rod 313. The feed pipe 311 is fixedly connected to the top end of the melting tank 1. Above the feed pipe 311, there is a telescopic cylinder 312. The telescopic end of the telescopic cylinder 312 is fixedly connected to the push rod 313. The top end of the feed pipe 311 is fixedly connected to a material conveying pipe 314. A material conveying box 315 is slidably connected inside the material conveying pipe 314. The bottom end of the material conveying box 315 is rotatably connected to a rotating plate 316.

[0066] During feeding, manually place the neodymium iron boron alloy block into the material conveying box 315. Then start the telescopic cylinder 312, so that the telescopic end of the telescopic cylinder 312 drives the push rod 313. Subsequently, the push rod 313 starts to drive the material conveying box 315 to move inside the material conveying pipe 314. When the material conveying box 315 moves to the feed inlet of the feed pipe 311, the neodymium iron boron alloy block in the material conveying box 315 presses the rotating plate 316 by gravity, causing the rotating plate 316 to rotate at the bottom end of the material conveying box 315. Thus, the neodymium iron boron alloy block slides from the top end of the rotating plate 316 into the feed pipe 311, and then enters the melting pot 211 through the feed pipe 311.

[0067] Working principle:

[0068] Before melting the neodymium iron boron alloy block, the iron boron alloy block is located in the material conveying box 315. The melting tank 1, the melting pot 211, the induction heating coil 212, the adjusting plate 224, the telescopic cylinder 312, the recovery tank 327, the feed pipe 311, the inlet pipe 321, the recovery pipe 324, the return pipe 326, the buffer box 325, the one-way valve 4, the water-cooled jacket 5 and the connecting pipe 329 are in the initial state; the electromagnetic induction coil 230 is slidably connected to the molybdenum cylinder 227, the slip ring rod 225 is slidably connected to the fixed rod 226, and a rotating plate 228 is rotatably connected between the slip ring rod 225 and the connecting plate 229; the first rack plate 221 meshes with the rotating gear 222, and the rotating gear 222 meshes with the second rack plate 223; the piston rod 323 is slidably connected to the air cylinder 322; the piston rod 323 is elastically connected to the spring; the material conveying box 315 is slidably connected to the material conveying pipe 314; the material conveying box 315 is rotatably connected to the rotating plate 316.

[0069] During the smelting process of the neodymium iron boron alloy block, the telescopic cylinder 312 is started, and the output end of the telescopic cylinder 312 drives the feeding box 315 to slide in the feeding pipe 314 towards the feeding pipe 311 through the push rod 313, so that the feeding box 315 is located at the inlet of the feeding pipe 311. Subsequently, the neodymium iron boron alloy block pushes the rotating plate 316 to rotate downward by its own gravity, and the neodymium iron boron alloy block begins to slide from the rotating plate 316 into the feeding pipe 311, and then flows from the feeding pipe 311 into the smelting pot 211. By controlling the external power supply, the induction heating coil 212 is operated to generate an alternating magnetic field to heat the smelting pot 211, and at the same time, cold water is injected into the water-cooled jacket 5 to prevent the high temperature during smelting from damaging the smelting tank 1.

[0070] When smelting the neodymium iron boron alloy block, the induction heating coil 212 starts to generate an alternating magnetic field to heat the smelting pot 211, so that the neodymium iron boron alloy block in the smelting pot 211 begins to melt into a melt. Subsequently, the external power supply is controlled to operate the electromagnetic induction coil 230, so that the electromagnetic induction coil 230 generates an alternating magnetic field to stir the neodymium iron boron alloy block being smelted in the smelting pot 211, and at the same time, neodymium vapor is generated. Subsequently, the neodymium vapor flows upward into the intake pipe 321, and the neodymium vapor enters the air cylinder 322 through the intake pipe 321. Then, the neodymium vapor pushes the piston rod 323 to move downward in the air cylinder 322, and the piston rod 323 squeezes the spring to contract downward, so that the piston rod 323 drives the first rack plate 221 to move downward. Then, the first rack plate 221 drives the rotating gear 222 to rotate through meshing, so that the rotating gear 222 drives the second rack plate 223 to move upward through meshing. The second rack plate 223 drives the adjusting plate 224 to slide upward at the bottom of the smelting tank 1, so that the adjusting plate 224 pushes the slip ring rod 225 to slide on the fixed plate. When the slip ring rod 225 slides, the slip ring rod 225 drives the rotating plate 228 to rotate on the connecting plate 229. Subsequently, the rotating plate 228 drives the connecting plate 229 to move away from each other, thereby pushing the electromagnetic induction coil 230 to slide towards the inner wall of the molybdenum cylinder 227, thereby expanding the stirring range. When the piston rod 323 moves to a certain position, the neodymium vapor flows into the buffer box 325 through the recovery pipe 324 for buffering. Then, the neodymium vapor slowly flows into the recovery tank 327 through the buffer box 325. Subsequently, the external air conditioner is started to fill the condensing pipe 328 with low-temperature cold air, so that the neodymium vapor condenses into neodymium metal solids in the recovery tank 327. Then, the one-way valve 4 is opened, and the neodymium metal solids in the recovery tank 327 flow into the smelting pot 211 through the connecting pipe 329 to be smelted together with the neodymium iron boron alloy block.

[0071] After the neodymium iron boron alloy block is melted, the melt in the melting pot 211 is discharged through the discharge pipe 6 to the next process. Subsequently, the telescopic cylinder 312 is closed, so that the telescopic cylinder 312 stops driving the feeding box 315 to slide in the feeding pipe 314 through the push rod 313, thereby stopping the feeding into the melting pot 211. The external power supply is turned off, so that the induction heating coil 212 and the electromagnetic induction coil 230 stop operating, the generated alternating magnetic field disappears, and the heating of the melting pot 211 stops, so that neodymium vapor cannot continue to be generated to push the piston rod 323 in the air cylinder 322 to squeeze the spring. The spring starts to reset through the reset elastic force, so the spring starts to push the piston rod 323 upward to reset. The piston rod 323 drives the first rack plate 221 to move upward, so that the first rack plate 221 drives the rotating gear 222 to rotate in the reverse direction through meshing. Thus, the rotating gear 222 drives the second rack plate 223 to move downward through meshing, so that the second rack plate 223 pushes the adjusting plate 224 downward. The adjusting plate 224 drives the sliding ring to slide downward on the fixed rod 226, so that the sliding ring rod 225 drives the rotating plate 228 to rotate in the reverse direction on the connecting plate 229. Thus, the rotating plate 228 drives the electromagnetic induction coil 230 to move toward the fixed rod 226 through the connecting plate 229, so that the electromagnetic induction coil 230 resets. At the same time, the external air conditioner is turned off to charge the condensing pipe 328 with low-temperature cold air, so that it cannot continue to condense neodymium metal solids. Subsequently, the one-way valve 4 is closed, so that the neodymium metal solids in the recovery tank 327 cannot flow into the melting pot 211 through the connecting pipe 329.

[0072] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A smelting device for sintered NdFeB permanent magnet material, characterized in that: include: A smelting tank (1), a smelting component (2) and a feeding component (3); The smelting component (2) comprises a heating component (210) arranged inside the smelting tank (1), and a stirring component (220) is arranged at the bottom end of the heating component (210); the stirring component (220) comprises at least two connecting plates (229), and the electromagnetic induction coil (230) is fixedly connected to the side of the connecting plate (229), and the at least two connecting plates (229) can move towards each other or move away from each other; The feed assembly (3) comprises a push assembly (310) arranged at the top of the smelting tank (1), and a recovery assembly (320) is arranged on the side of the push assembly (310); the recovery assembly (320) is used to recover the neodymium vapor and to convert the energy of the neodymium vapor into kinetic energy for driving the two connecting plates (229) to move away from each other; The recovery component (320) comprises a recovery part, a condensation part and a material return part, the recovery part is connected to the condensation part pipeline, and the bottom end of the condensation part is fixedly connected to the material return part; The stirring assembly (220) further comprises a piston part, a driving part and an adjusting part, wherein the bottom end of the piston part is fixedly connected to the driving part, and the bottom end of the driving part is fixedly connected to the adjusting part; The recovery unit comprises: an air intake pipe (321) and an air cylinder (322), wherein the air intake pipe (321) is fixedly connected to the top of the smelting tank (1), and the air intake pipe (321) is in communication with the air cylinder (322); The condensation section comprises: a recovery pipe (324) and a buffer box (325); the side of the gas cylinder (322) is fixedly connected to the recovery pipe (324); the recovery pipe (324) is in communication with the buffer box (325); a return pipe (326) is fixedly connected to the bottom end of the buffer box (325); a condensation pipe (328) is arranged below the return pipe (326); and a plurality of condensation pipes (328) are in communication with each other via pipelines; The material return section comprises: a recovery tank (327) and a connecting pipe (329), the interior of the recovery tank (327) is fixedly connected to a condenser pipe (328), the bottom end of the recovery tank (327) is fixedly connected to the connecting pipe (329), and the connecting pipe (329) is in communication with the smelting tank (1); The piston part comprises: a piston rod (323) and a first rack plate (221); the interior of the air cylinder (322) is slidably connected to the piston rod (323); and the bottom end of the piston rod (323) is fixedly connected to the first rack plate (221); The driving part comprises: a rotating gear (222), a second rack plate (223) and an adjusting plate (224); the first rack plate (221) is meshed with the rotating gear (222); the rotating gear (222) is meshed with the second rack plate (223); and the bottom end of the second rack plate (223) is fixedly connected to the adjusting plate (224); The adjustment part comprises a slip ring rod (225), a fixed rod (226), a rotating plate (228) and a molybdenum tube (227); the top end of the adjustment plate (224) is fixedly connected to the slip ring rod (225); the interior of the slip ring rod (225) is slidably connected to the fixed rod (226); the top end of the fixed rod (226) is fixedly connected to the molybdenum tube (227); the two sides of the top end of the slip ring rod (225) are rotatably connected to the rotating plates (228); the side surfaces of the rotating plates (228) are rotatably connected to the connecting plates (229).

2. The smelting device of sintered NdFeB permanent magnet material according to claim 1, characterized in that: The smelting component (2) comprises a heating component (210), and the stirring component (220) is used for stirring the NdFeB alloy block in the heating component (210); The heating component (210) comprises: a smelting pot (211) and an induction heating coil (212); the smelting pot (211) is arranged at the top of the molybdenum cylinder (227); and the induction heating coil (212) is arranged on the surface of the smelting pot (211).

3. The smelting device of sintered NdFeB permanent magnet material according to claim 2, characterized in that: The bottom end of the electromagnetic induction coil (230) is slidably connected to the molybdenum cylinder (227).

4. The smelting device of sintered NdFeB permanent magnet material according to claim 3, characterized in that: A discharge pipe is extended from the bottom end of the smelting pot (211) through the smelting tank (1).

5. The smelting device of sintered NdFeB permanent magnet material according to claim 4, characterized in that: A one-way valve (4) is provided on the side of the connecting pipe (329).

6. The smelting device for sintered NdFeB permanent magnet material according to claim 5, characterized in that: The feed component (3) comprises a push component (310), and the recovery component (320) is used to recover and utilize the neodymium vapor in the heating component (210); The pushing assembly (310) comprises: a feeding pipe (311) and a second pushing rod (313); the feeding pipe (311) is fixedly connected to the top of the smelting tank (1); a telescopic cylinder (312) is arranged above the feeding pipe (311); the telescopic end of the telescopic cylinder (312) is fixedly connected to the second pushing rod (313); a feeding pipe (314) is fixedly connected to the top of the feeding pipe (311); a feeding box (315) is slidably connected inside the feeding pipe (314); a rotating plate (316) is rotatably connected to the bottom end of the feeding box (315); and one side of the feeding box (315) is fixedly connected to the second pushing rod (313).

7. The smelting device for sintered NdFeB permanent magnet material according to claim 6, characterized in that: A water cooling jacket (5) is provided between the interior of the smelting tank (1) and the smelting pot (211).

8. The smelting device for sintered NdFeB permanent magnet material according to claim 7, characterized in that: A spring is fixedly connected between the interior of the gas cylinder (322) and the piston rod (323).

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