Smelting device for sintered neodymium-iron-boron permanent magnet material

Abstract

The invention discloses a smelting device for a sintered neodymium-iron-boron permanent magnet material, and relates to the technical field of neodymium-iron-boron permanent magnet material smelting. The smelting device comprises a smelting tank, a smelting assembly and a feeding assembly; the smelting assembly comprises a heating assembly arranged in the smelting tank, and a stirring assembly is arranged at the bottom end of the heating assembly; the feeding assembly comprises a pushing assembly arranged at the top end of the smelting tank, and a recycling assembly is arranged on the side face of the pushing assembly. The recycling assembly comprises a recycling part, a condensation part and a material returning part, the recycling part is connected with 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 comprises 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.

Description

Technical Field

[0001] The invention relates to the technical field of smelting NdFeB permanent magnet materials, and in particular to a smelting device for sintered NdFeB permanent magnet materials. Background Art

[0002] NdFeB permanent magnet materials have been widely used in electronics, motors, new energy vehicles and other fields due to their excellent magnetic properties and broad application prospects. The production process of this material includes alloy smelting, powder preparation, molding, sintering and subsequent magnetic property adjustment, among which the smelting process is an important step in determining the final material performance.

[0003] Existing smelting equipment usually uses induction heating. However, during the smelting process, as the NdFeB alloy block gradually melts, the flow of its liquid and solid parts is not smooth, and the heat cannot be evenly distributed, resulting in segregation of alloy components and reducing the smelting effect. At the same time, during the smelting process, neodymium vapor is easily generated, and the lack of an effective gas recovery and treatment system causes neodymium vapor to volatilize, resulting in raw material loss and reduced resource utilization. Summary of the invention

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

[0005] To achieve this object, the present invention adopts the following technical solutions: A smelting device for sintered NdFeB permanent magnet material, comprising: a smelting pot, a smelting assembly and a feeding assembly; The smelting assembly includes a heating assembly arranged inside the smelting tank, and a stirring assembly is arranged at the bottom of the heating assembly; the stirring assembly includes at least two connecting plates, and an electromagnetic induction coil is fixedly connected to the side of the connecting plate, and at least two connecting plates can move toward or away from each other; The feed assembly includes a push assembly arranged at the top of the smelting tank, and a recovery assembly is arranged on the side of the push assembly; the recovery assembly is used to recover neodymium vapor and convert the energy of the neodymium vapor into kinetic energy for pushing the two connecting plates to move away from each other.

[0006] The recycling component comprises a recycling part, a condensing part and a material return part, the recycling part is connected to the condensing part pipeline, and the bottom end of the condensing part is fixedly connected to the material return part; The stirring assembly comprises 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.

[0007] Preferably, the recovery unit comprises: an air intake pipe and an air cylinder, wherein the air intake pipe is fixedly connected to the top of the smelting tank, and the air intake pipe is communicated with the air cylinder; The condensation part comprises: a recovery pipe and a buffer box, the side of the gas cylinder is fixedly connected to the recovery pipe, the recovery pipe is communicated with the buffer box, the bottom of the buffer box is fixedly connected to a return pipe, a condensation pipe is arranged below the return pipe, and a plurality of the condensation pipes are communicated with each other through pipelines; The material return section comprises: a recovery tank and a connecting pipe, the interior of the recovery tank is fixedly connected to a condenser pipe, the bottom end of the recovery tank is fixedly connected to the connecting pipe, and the connecting pipe is communicated with a smelting tank.

[0008] Preferably, the piston portion comprises: a piston rod and a first rack plate, the interior of the cylinder is slidably connected to the piston rod, and the bottom end of the piston rod is fixedly connected to the first rack plate; The driving part comprises: 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 the adjusting plate; The adjustment part includes a slip ring rod, a fixed rod, a rotating plate and a molybdenum tube. The top of the adjustment plate is fixedly connected to the slip ring rod, the inside of the slip ring rod is slidably connected to the fixed rod, the top of the fixed rod is fixedly connected to the molybdenum tube, the two sides of the top of the slip ring rod are fixedly connected to the rotating plates, and the side surfaces of the rotating plate are fixedly connected to the connecting plate.

[0009] Preferably, the smelting assembly includes a heating assembly, and the stirring assembly is used to stir the NdFeB alloy block in the heating assembly; The heating component comprises: a smelting pot and an induction heating coil. The smelting pot is arranged on the top of the molybdenum tube, and the induction heating coil is arranged on the surface of the smelting pot.

[0010] Preferably, the bottom end of the electromagnetic induction coil is slidably connected to the molybdenum cylinder.

[0011] Preferably, the plurality of condensing tubes are interconnected via pipelines.

[0012] Preferably, a one-way valve is provided on the side of the connecting pipe.

[0013] Preferably, the feed assembly includes a push assembly, and the recovery assembly is used for recycling the push assembly; The pushing assembly includes: a feed pipe and a pushing rod, the feed pipe is fixedly connected to the top of the smelting tank, a telescopic cylinder is arranged above the feed pipe, the telescopic end of the telescopic cylinder is fixedly connected to the pushing rod, a delivery pipe is fixedly connected to the top of the feed pipe, a delivery box is slidably connected inside the delivery pipe, a rotating plate is rotatably connected to the bottom end of the delivery box, and one side of the delivery box is fixedly connected to the pushing rod.

[0014] Preferably, a water cooling jacket is provided between the interior of the smelting tank and the smelting pot.

[0015] Preferably, a spring is fixedly connected between the interior of the gas cylinder and the piston rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: During the smelting process, the NdFeB alloy block is placed into the pusher assembly of the feed assembly, and then the pusher assembly puts the NdFeB alloy block into the heating assembly. The heating assembly begins to melt the NdFeB alloy block through induction heating. As time goes by, the NdFeB alloy block begins to change from solid to liquid, and 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 squeeze the spring to contract, and then the piston rod pushes the rotating gear downward through the first rack plate to rotate, and the rotating gear drives the adjustment plate to move upward through the second rack plate, so that the adjustment plate drives the electromagnetic induction coil to the inner wall of the molybdenum cylinder through the slip ring rod. The piston rod moves in the direction of rotation, thereby increasing the range of stirring of the electromagnetic induction coil through the alternating magnetic field, ensuring that the NdFeB alloy block has a uniform temperature distribution during the entire smelting process, thus solving the problem that the temperature cannot be evenly distributed during the smelting process and reduces the smelting effect; when the neodymium vapor pushes the piston rod to a certain point, its neodymium vapor enters the buffer box through the recovery pipe, and then the neodymium vapor slowly enters the recovery tank through the return pipe, so that the condenser condenses the neodymium vapor through cold air, and then the neodymium vapor begins to condense into neodymium solid, so that the neodymium solid flows into the smelting pot through the connecting pipe and is smelted together with the NdFeB alloy block, so that the neodymium vapor can be recycled and the resource utilization rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of a melting device for sintered NdFeB permanent magnet material of the present invention; Figure 2It is a schematic cross-sectional structure diagram of components such as a recovery pipe, a buffer box and a return pipe in a smelting device for sintered NdFeB permanent magnet material of the present invention; Figure 3 It is a structural schematic diagram of components such as a first rack plate, a rotating gear and a second rack plate in a smelting device for sintered NdFeB permanent magnet material of the present invention; Figure 4 It is a schematic cross-sectional structure diagram of components such as a recovery tank, a condenser pipe, and a connecting pipe in a smelting device for sintered NdFeB permanent magnet material of the present invention; Figure 5 for Figure 2 A schematic diagram of the partially enlarged structure at center A; Figure 6 for Figure 2 Schematic diagram of the local enlarged structure at point B in the middle.

[0020] Illustration: 1. Melting tank; 2. Melting assembly; 3. Feed assembly; 4. Check valve; 5. Water cooling jacket; 6. Discharge pipe; 210, heating component; 211, smelting pot; 212, induction heating coil; 220, stirring assembly; 221, first rack plate; 222, rotating gear; 223, second rack plate; 224, adjusting plate; 225, slip ring rod; 226, fixing rod; 227, molybdenum cylinder; 228, rotating plate; 229, connecting plate; 230, electromagnetic induction coil; 310, pusher assembly; 311, feed pipe; 312, telescopic cylinder; 313, push rod; 314, feed pipe; 315, feed box; 316, rotating plate; 320. Recovery assembly; 321. Air inlet pipe; 322. Air cylinder; 323. Piston rod; 324. Recovery pipe; 325. Buffer box; 326. Return pipe; 327. Recovery tank; 328. Condenser; 329. Connecting pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] The melting device of sintered NdFeB permanent magnet material uses the Lorentz force generated by electromagnetic induction to suspend the metal, allowing it to be melted in a container-free environment, avoiding crucible contamination and improving material purity. It is mainly used in high-end electronic devices, medical equipment, laboratory research and high-performance magnetic material production. NdFeB permanent magnet material is a rare earth permanent magnet material composed of neodymium, iron, boron and other trace elements. It has an extremely high magnetic energy product and is one of the permanent magnet materials with the best performance at present.

[0025] refer to Figure 1 - Figure 6 As shown, the embodiment of the present invention provides a smelting device for sintered NdFeB permanent magnet material, comprising: a smelting pot 1, a smelting component 2 and a feeding component 3; The smelting assembly 2 includes a heating assembly 210 disposed inside the smelting tank 1, and a stirring assembly 220 is disposed at the bottom of the heating assembly 210; the stirring assembly 220 includes at least two connecting plates 229, and an electromagnetic induction coil 230 is fixedly connected to the side of the connecting plate 229, and at least two connecting plates 229 can move toward or away from each other; The feed assembly 3 includes a push assembly 310 arranged at the top of the smelting pot 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.

[0026] The recovery component 320 includes 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 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.

[0027] The smelting component 2 is used for smelting the NdFeB alloy block; the heating component 210 is mainly used for induction heating of the NdFeB alloy block; the stirring component 220 is used for electromagnetic stirring of the NdFeB alloy block in the heating component 210; the feeding component 3 is mainly used for feeding the smelting pot 1; the pushing component 310 is used to put the NdFeB alloy block material into the smelting pot 211; the recovery component 320 is used to recycle the neodymium vapor generated by heating the NdFeB alloy block; The NdFeB alloy block is placed into the pushing component 310, and then the pushing component 310 pushes the NdFeB alloy block into the heating component 210. Then the heating component 210 induction heats the NdFeB alloy block through the alternating magnetic field, thereby starting smelting. Neodymium vapor is generated during the smelting process, and then the neodymium vapor begins to move upward into the recovery part of the recovery component 320. The recovery component 320 drives the piston part of the stirring component 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 toward the inner wall of the molybdenum cylinder through the adjustment part, thereby expanding the range and stirring the iron-boron alloy block being smelted. At the same time, the recovery component 320 condenses the collected neodymium vapor to convert it into neodymium metal solid and adds it to the heating component 210 for smelting together with the iron-boron alloy block.

[0028] During the smelting process, the NdFeB alloy block is located in the pushing assembly 310, which transports the NdFeB alloy block to the heating assembly 210. The heating assembly 210 heats the NdFeB alloy block by induction heating through an alternating magnetic field, thereby melting the NdFeB alloy block into a melt. At the same time, the stirring assembly 220 stirs the FeB alloy block being melted 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, thereby solving the problem that the temperature cannot be evenly distributed during the smelting process, thereby reducing the smelting effect. On the other hand, the recovery assembly 320 condenses the neodymium vapor to convert it into neodymium metal solid to be melted together with the FeB alloy block, thereby solving the problem that the neodymium vapor cannot be recycled and utilized, thereby reducing resource utilization.

[0029] refer to Figure 2 As shown, the smelting assembly 2 includes a heating assembly 210, and the stirring assembly 220 is used to stir the NdFeB alloy block in the heating assembly 210; The heating assembly 210 includes: a smelting pot 211 and an induction heating coil 212 . The smelting pot 211 is disposed on the top of the molybdenum cylinder 227 , and the induction heating coil 212 is disposed on the surface of the smelting pot 211 .

[0030] During the smelting process of the NdFeB alloy block, the induction heating coil 212 is connected to an external power source. The external power source 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. Then, the smelting pot 211 transfers the heat to the NdFeB alloy block inside it for smelting. At the same time, cold water is injected into the water cooling jacket 5 to prevent the smelting high temperature from damaging the smelting pot 1.

[0031] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the recovery part includes: an air intake pipe 321 and an air cylinder 322, the air intake pipe 321 is fixedly connected to the top of the smelting tank 1, and the air intake pipe 321 is communicated with the air cylinder 322; The condensation section includes: a recovery pipe 324 and a buffer box 325. The side of the gas cylinder 322 is fixedly connected to the recovery pipe 324, and the recovery pipe 324 is communicated with the buffer box 325. The bottom of the buffer box 325 is fixedly connected with a return pipe 326. A condenser pipe 328 is arranged below the return pipe 326. The multiple condenser pipes 328 are interconnected through pipelines. Neodymium vapor can be effectively guided to the condensation section during the smelting process, and the cold air in the condensation section flows into the condenser pipe 328. The neodymium vapor is quickly condensed into solid neodymium metal through low-temperature cooling, thereby greatly improving the recovery efficiency of neodymium metal. After condensation, the neodymium metal flows into the recovery tank 327 through the return pipe 326, which ensures condensation while avoiding waste of resources. The neodymium metal solid in the recovery tank 327 is finally reintroduced into the smelting pot 211 to participate in the smelting process of the alloy, forming a closed-loop cycle, which greatly improves the resource utilization rate of neodymium. Compared with the existing smelting device, the condensation section optimizes the gas condensation process, which not only enables the efficient recovery of neodymium vapor, but also effectively reduces the volatilization loss of neodymium, thereby improving the environmental performance of the equipment. The design of the condensation section ensures the temperature uniformity of the neodymium iron boron alloy block during the smelting process, while avoiding the waste of neodymium vapor, providing sufficient neodymium metal support for the subsequent smelting process, thereby improving the overall smelting efficiency and product quality.

[0032] The material return section includes: a recovery tank 327 and a connecting pipe 329 . The interior of the recovery tank 327 is fixedly connected to a condensing pipe 328 . The bottom end of the recovery tank 327 is fixedly connected to the connecting pipe 329 . The connecting pipe 329 is communicated with the smelting tank 1 .

[0033] During the smelting process of the NdFeB alloy block, the condenser 328 is connected to an external air cooler, and the neodymium vapor generated by it flows upward into the air inlet pipe 321, and then flows into the air cylinder 322 through the air inlet pipe 321 to push the piston rod 323 downward to squeeze the spring, causing the spring to contract. When the piston rod 323 moves downward to a certain point in the air cylinder 322, its neodymium vapor flows into the buffer box 325 through the recovery pipe 324 for buffering, and then the neodymium vapor slowly flows into the recovery tank 327 through the buffer box 325, and then the external air cooler is started to fill the condenser 328 with low-temperature cold air, so that the neodymium vapor is condensed into neodymium metal solid in the recovery tank 327, and then the one-way valve 4 is opened to allow the neodymium metal solid in the recovery tank 327 to flow into the smelting pot 211 through the connecting pipe 329 to be smelted together with the iron-boron alloy block.

[0034] refer to Figure 2 , Figure 3 and Figure 5 As shown, the piston part includes: a piston rod 323 and a first rack plate 221, the interior of the gas cylinder 322 is slidably connected with the piston rod 323, and the bottom end of the piston rod 323 is fixedly connected with the first rack plate 221; 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; 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 two sides of the top of the slip ring rod 225 are fixedly connected to the rotating plates 228, and the side of the rotating plate 228 is fixedly 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 best match between the intensity of the magnetic field 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.

[0035] 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.

[0036] refer to Figure 1 , Figure 2 and Figure 6 As shown, the feeding assembly 3 includes a pushing assembly 310, and the recycling assembly 320 is used for recycling the pushing assembly 310; The pushing assembly 310 includes: a feed pipe 311 and a pushing rod 313. The feed pipe 311 is fixedly connected to the top of the smelting tank 1. A telescopic cylinder 312 is arranged above the feed pipe 311. The telescopic end of the telescopic cylinder 312 is fixedly connected to the pushing rod 313. A delivery pipe 314 is fixedly connected to the top of the feed pipe 311. A delivery box 315 is slidably connected inside the delivery pipe 314. The bottom end of the delivery box 315 is rotatably connected to a rotating plate 316.

[0037] When feeding, the NdFeB alloy block is manually placed into the feed box 315, and then the telescopic cylinder 312 is started, so that the telescopic end of the telescopic cylinder 312 drives the push rod 313, and then the push rod 313 starts to drive the feed box 315 to move in the feed pipe 314. When the feed box 315 moves to the feed port of the feed pipe 311, the NdFeB alloy block in the feed box 315 squeezes the rotating plate 316 through gravity, so that the rotating plate 316 rotates at the bottom end of the feed box 315, so that the NdFeB alloy block slides from the top of the rotating plate 316 into the feed pipe 311, and then enters the smelting pot 211 through the feed pipe 311.

[0038] Working principle: Before smelting the NdFeB alloy block, the NdFeB alloy block is located in the feed box 315, and the smelting tank 1, smelting pot 211, induction heating coil 212, adjustment plate 224, telescopic cylinder 312, recovery tank 327, feed pipe 311, air inlet pipe 321, recovery pipe 324, return pipe 326, buffer box 325, check valve 4, water cooling jacket 5 and 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 the slip ring rod 225 and the connecting plate 229 are rotatably connected to the rotating plate 228; the first rack plate 221 is meshed with the rotating gear 222, and the rotating gear 222 is meshed 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 feed box 315 is slidably connected to the feed pipe 314; the feed box 315 is rotatably connected to the rotating plate 316.

[0039] During the smelting process of the NdFeB alloy block, the telescopic cylinder 312 is started, so that the output end of the telescopic cylinder 312 drives the feed box 315 to slide in the feed pipe 314 toward the feed pipe 311 through the push rod 313, so that the feed box 315 is located at the inlet of the feed pipe 311, and then the NdFeB alloy block pushes the rotating plate 316 downward to rotate downward by its own gravity, and the NdFeB alloy block begins to slide from the rotating plate 316 into the feed pipe 311, and then flows from the feed pipe 311 into the smelting pot 211, and the induction heating coil 212 is operated by controlling the external power supply, so that the induction heating coil 212 begins to generate an alternating magnetic field to heat the smelting pot 211, and at the same time, cold water is injected into the water cooling jacket 5 to prevent the smelting high temperature from damaging the smelting pot 1.

[0040] When the NdFeB alloy block is smelted, the induction heating coil 212 starts to generate an alternating magnetic field to heat the smelting pot 211, so that the NdFeB alloy block in the smelting pot 211 starts to melt into a melt, and then 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 NdFeB alloy block being smelted in the smelting pot 211, and neodymium steam is generated at the same time, and then the neodymium steam flows upward into the air intake pipe 321, and the neodymium steam enters the air cylinder 322 through the air intake pipe 321, and then the neodymium steam pushes the piston rod 323 downward in the air cylinder 322 to move downward, and the piston rod 323 squeezes the spring downward to contract, so that the piston rod 323 drives the first rack plate 221 to move downward, and 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, and the second rack plate 223 drives the adjustment plate 224 The bottom end of the smelting pot 1 slides upward, so that the adjustment plate 224 pushes the slip ring rod 225 upward 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, and then the rotating plate 228 drives the connecting plate 229 to move in opposite directions, thereby pushing the electromagnetic induction coil 230 to slide toward the inner wall of the molybdenum cylinder 227, thereby expanding the stirring range. When the piston rod 323 moves to a certain place, its neodymium vapor flows into the buffer box 325 through the recovery pipe 324 for buffering, and then the neodymium vapor slowly flows into the recovery tank 327 through the buffer box 325, and then the external air conditioner is started to fill the condenser 328 with low-temperature cold air, so that the neodymium vapor is condensed into neodymium metal solid in the recovery tank 327, and then the one-way valve 4 is opened to allow the neodymium metal solid in the recovery tank 327 to flow into the smelting pot 211 through the connecting pipe 329 to be smelted together with the iron-boron alloy block.

[0041] After the NdFeB alloy block is melted, the melt in the melting pot 211 is discharged to the next process through the discharge pipe 6, and then the telescopic cylinder 312 is closed, so that the telescopic cylinder 312 stops driving the feed box 315 to slide in the feed pipe 314 through the push rod 313, thereby stopping the feeding into the melting pot 211, and turning off the external power supply, so that the induction heating coil 212 and the electromagnetic induction coil 230 stop operating, so that the generated interactive magnetic field disappears, and the heating of the melting pot 211 stops, so that the neodymium vapor can no longer be generated, and the piston rod 323 is pushed in the cylinder 322 to squeeze the spring, and the spring begins to reset through the reset elastic force, so that the spring begins to push the piston rod 323 upward to reset, and the piston rod 323 drives the first rack plate 221 upward to move, so that the first rack plate 221 passes The meshing drives the rotating gear 222 to rotate in the opposite direction, so that the rotating gear 222 drives the second rack plate 223 to move downward through the meshing, so that the second rack plate 223 pushes the adjusting plate 224 downward, and the adjusting plate 224 drives the slip ring downward on the fixed rod 226, so that the slip ring rod 225 drives the rotating plate 228 to rotate in the opposite direction on the connecting plate 229, so that 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 is reset, and at the same time, the external air conditioner is turned off to fill the condenser 328 with low-temperature cold air, so that it can no longer condense the neodymium metal solid, and then the one-way valve 4 is closed, so that the neodymium metal solid in the recovery tank 327 cannot flow into the smelting pot 211 through the connecting pipe 329.

[0042] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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) 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.

2. The smelting device of sintered NdFeB permanent magnet material according to claim 1, characterized in that: 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).

3. The smelting device of sintered NdFeB permanent magnet material according to claim 2, characterized in that: 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 inside 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 fixedly connected to the rotating plate (228); and the side of the rotating plate (228) is fixedly connected to the connecting plate (229).

4. The smelting device of sintered NdFeB permanent magnet material according to claim 3, 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).

5. The smelting device of sintered NdFeB permanent magnet material according to claim 4, characterized in that: The bottom end of the electromagnetic induction coil (230) is slidably connected to the molybdenum cylinder (227).

6. The smelting device for sintered NdFeB permanent magnet material according to claim 5, characterized in that: A discharge pipe is extended from the bottom end of the smelting pot (211) through the smelting tank (1).

7. The smelting device of sintered NdFeB permanent magnet material according to claim 2, characterized in that: A one-way valve (4) is provided on the side of the connecting pipe (329).

8. The smelting device for sintered NdFeB permanent magnet material according to claim 7, characterized in that: The feeding component (3) comprises a pushing component (310), and the recycling component (320) is used for recycling the pushing component (310); 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).

9. The smelting device of sintered NdFeB permanent magnet material according to claim 8, characterized in that: A water cooling jacket (5) is provided between the interior of the smelting tank (1) and the smelting pot (211).

10. The smelting device of sintered NdFeB permanent magnet material according to claim 2, 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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