Mixing device and mixing method for neodymium-iron-boron magnet production

Abstract

The invention provides a mixing device and a mixing method for neodymium-iron-boron magnet production, and belongs to the technical field of mixing devices.The mixing device comprises a mixing tank body, a detachable top cover is arranged at the top of the mixing tank body, a screening assembly and an airflow crushing assembly are arranged at the top of the top cover, the screening assembly comprises a screening box, and the screening box is arranged at the top of the top cover; the airflow crushing assembly comprises an airflow crushing bin, one side of the screening box is connected with the airflow crushing bin, a stirring cavity is formed in the mixing tank body, a stirring assembly is arranged in the stirring cavity, the stirring assembly comprises a separation cover and two sets of spiral material turning blades, and the separation cover divides the stirring cavity into an inner mixing cavity, a material turning cavity and a top mixing cavity. A plurality of groups of communicating grooves for communicating the inner mixing cavity with the material turning cavity are formed in the bottom end of the separation cover; the two groups of spiral material turning blades are positioned in the material turning cavity; through the arrangement of the airflow crushing assembly, large-particle materials can be crushed into fine particles; and through the arrangement of the stirring assembly, the materials can circulate in different chambers, and uniform mixing of the materials is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of material mixing devices, and more specifically, particularly relates to a material mixing device and a material mixing method for producing NdFeB magnets. Background Art

[0002] As a permanent magnetic material, NdFeB magnets have excellent magnetic properties. Compared with traditional ferrite magnets, NdFeB magnets have higher energy product and magnetic energy product, and can generate stronger magnetic fields at the same volume. Therefore, they are widely used in electronics, motors, automobiles and other fields.

[0003] The production process of NdFeB magnets is complicated. The mixing process is the basis of the entire production process. The material powder of NdFeB magnets needs to be mixed evenly according to a certain ratio. For example, the Chinese utility model patent with patent number 201521092281.4 provides a mixing device for a NdFeB magnet production line. The device is provided with a mixing bin, a stirring frame, an outer spiral belt and an inner spiral belt. When in use, the stirring frame is provided with an outer spiral belt and an inner spiral belt for stirring, so that the material in the mixing bin is double stirred inside and outside. However, when the traditional mixing device directly mixes the material powder with uneven particle size, it lacks effective processing capacity and it is difficult to ensure the uniformity of mixing, which further affects the performance of the magnet. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a mixing device and a mixing method for NdFeB magnet production, so as to solve the technical problem in the prior art that the traditional mixing device lacks effective processing capacity when directly mixing material powders with uneven particle sizes, and it is difficult to ensure the uniformity of mixing, thereby affecting the performance of the magnet.

[0005] The purpose and effect of the mixing device and mixing method for producing NdFeB magnets of the present invention are achieved by the following specific technical means: A mixing device for producing NdFeB magnets, comprising a mixing tank body, a detachable top cover is arranged on the top of the mixing tank body, a screening component and an airflow crushing component are arranged on the top of the top cover, the screening component comprises a screening box, the screening box is arranged on the top of the top cover, the airflow crushing component comprises an airflow crushing bin, one side of the screening box is connected to the airflow crushing bin, a stirring chamber is arranged in the mixing tank body, a stirring component is arranged in the stirring chamber, the stirring component comprises a partition cover and two groups of spiral turning blades, the partition cover divides the stirring chamber into an inner mixing chamber, a turning chamber and a top mixing chamber, a plurality of connecting grooves for connecting the inner mixing chamber and the turning chamber are arranged at the bottom of the partition cover, the two groups of spiral turning blades are both located in the turning chamber, and the bottom of the mixing tank body is connected to a first discharge pipe via a first one-way valve.

[0006] According to a preferred embodiment, the inner mixing chamber and the top of the turning chamber are both connected to the top mixing chamber, the stirring assembly also includes a concentric dual-axis motor, a first mounting seat is provided on the top of the top cover, the concentric dual-axis motor is provided on the top of the first mounting seat, a first connecting shaft and a second connecting shaft are provided in the stirring chamber, a through hole is provided on the top of the first connecting shaft, the second connecting shaft is inserted into the through hole, mounting holes are provided on the top cover and the first mounting seat, two groups of main shafts of the concentric dual-axis motor pass through the two groups of mounting holes and are respectively connected to the first connecting shaft and the second connecting shaft, and a sealing sleeve is provided in the mounting hole on the top cover.

[0007] According to a preferred embodiment, connecting parts are provided on both sides of the first connecting shaft, and connecting frames are provided at the corresponding ends of the two groups of connecting parts, and the bottom ends of the two groups of connecting frames are respectively connected to the two groups of spiral turning blades, and the two groups of spiral turning blades are in contact with the inner wall of the mixing tank body and the outer side of the partition cover; two groups of scrapers are respectively provided on the corresponding sides of the two groups of connecting frames, and the two groups of scrapers are located in the top mixing chamber, and one side of the two groups of scrapers are in contact with the inner wall of the mixing tank body, and the bottom ends of the two groups of connecting frames are provided with guide covers facing the inner mixing chamber corresponding to the spiral turning blades.

[0008] According to a preferred embodiment, two groups of first connecting seats are arranged on the second connecting shaft corresponding to the top mixing chamber, three groups of first stirring frames are arranged in the top mixing chamber, one side of the three groups of first stirring frames are respectively connected to the two groups of first connecting seats through two groups of first connecting rods, three groups of first stirring plates facing the second connecting shaft are arranged in the first stirring frame, two groups of second connecting seats are also arranged on the second connecting shaft corresponding to the inner mixing chamber, both sides of the two groups of second connecting seats are connected to the second stirring frames through two groups of second connecting rods, three groups of second stirring plates facing the bottom of the inner mixing chamber are arranged on the second stirring frame, and a pushing plate is arranged at the bottom end of the second connecting shaft corresponding to the multiple groups of connecting grooves, and one side of the two groups of second stirring frames are in contact with the inner wall of the partition cover.

[0009] According to a preferred embodiment, the air flow pulverizing assembly also includes a fan and a dust filter, a second mounting seat is provided on the top of the top cover, the top of the second mounting seat is connected to the dust filter by screws, a mounting bracket is provided on one side of the mixing tank body, the fan is installed on the mounting bracket, a driving motor is provided at the bottom of the fan, one end of an air pipe is connected to the top, the other end of the air pipe is connected to the dust filter, one side of the dust filter is connected to the air flow pulverizing bin through a pulverizing gas inlet pipe, an air inlet pipe connected to an external air circuit is provided on the air inlet on one side of the fan, and a pressure regulating valve is provided on the air pipe.

[0010] According to a preferred embodiment, a crushing trough is provided in the airflow crushing bin, the screening assembly is connected with the crushing trough through a feed one-way pipe, an airway top plate and an airway bottom plate are provided in the crushing trough, the airway top plate and the airway bottom plate are connected by a jet ring, a through hole connected with the crushing gas inlet pipe is provided on the top of the airway top plate, a plurality of groups of crushing jet ports are provided on the circumferential side of the jet ring, a second discharge pipe is provided at the bottom of the airflow crushing bin, a second one-way valve is provided at the bottom end of the second discharge pipe, a feed port is provided at the top of the top cover, and the bottom end of the second one-way valve is connected with the feed port.

[0011] According to a preferred embodiment, the screening assembly also includes a first feed pipe and a return pipe, a third mounting seat is arranged on the top of the top cover, the screening box is arranged on the top of the third mounting seat, a screening slot is provided on the top of the screening box, a feed hopper is provided on the top of the screening slot, coarse filter plates and fine filter plates distributed up and down are provided in the screening slot, a return port and a grinding port are provided on one side of the screening box corresponding to the coarse filter plates and the fine filter plates, one end of the return pipe is connected to the return port, and the other end of the return pipe is connected to an external crusher, one side of the grinding port is connected to the airflow crushing assembly through a feed one-way pipe, a discharge port is provided at the bottom of the discharge port, the first feed pipe is provided at the bottom of the discharge port, and a second feed pipe is also provided on the top of the top cover, and the bottom end of the first feed pipe is connected to the second feed pipe.

[0012] According to a preferred embodiment, two groups of mounting blocks are provided on the inner walls on both sides of the screening trough, and the two ends of the coarse filter plate and the fine filter plate are respectively connected to the four groups of mounting blocks, and two groups of first material collecting covers are provided on one side of the screening box corresponding to the return port and the grinding port, and the two groups of the first material collecting covers are respectively connected to the feed one-way pipe and the return pipe, and a second material collecting cover is installed at the bottom of the screening box corresponding to the discharge port, and a through groove is opened on the top of the third mounting seat corresponding to the second material collecting cover, and the second material collecting cover passes through the through groove and is connected to the top end of the first feed pipe.

[0013] According to a preferred embodiment, a partition plate is provided in the screening slot, the coarse filter plate and the fine filter plate are both located on one side of the partition plate, a mounting plate is provided on the third mounting seat, an eccentric motor is provided on the top of the mounting plate, a sliding groove is provided on the third mounting seat and the bottom of the screening box, slidable movable rods are provided in the two groups of sliding grooves, the bottom ends of the two groups of movable rods are connected to the T-shaped plate, the main shaft of the eccentric motor is rotatably connected to the T-shaped plate, and limited space is provided at the bottom of the two groups of sliding grooves Seat, two groups of movable rods are provided with limiting grooves, the two groups of limiting seats are slidably connected with the two groups of limiting grooves, the top ends of the two groups of movable rods are respectively connected with the coarse filter plate and the fine filter plate, two groups of third collecting covers are arranged on the other side of the partition plate corresponding to the return port and the grinding port, one side of the two groups of third collecting covers are provided with a first through hole, a fourth collecting cover is arranged at the bottom of the fine filter plate, a second through hole is arranged at the bottom of the fourth collecting cover corresponding to the discharge port, and a through groove is arranged on one side of the partition plate corresponding to the fine filter plate.

[0014] A mixing method of a mixing device for producing NdFeB magnets comprises the following steps: Step 1: Material delivery; Weigh the various materials required according to the formula of NdFeB magnets, and pour the materials into the screening slot of the screening box through the feed hopper; Step 2: Material screening; The material passes through the coarse filter plate and the fine filter plate distributed above and below in turn. The material blocks that do not meet the particle size requirements will be intercepted by the coarse filter plate, discharged through the return port and the return pipe, and transported to the external crusher for re-crushing for subsequent reuse. The larger particles of material are intercepted by the fine filter plate and enter the air flow crushing bin through the grinding port and the feed one-way pipe, while the qualified material particles fall into the mixing tank from the discharge port at the bottom of the screening box through the first feed pipe and the second feed pipe; Step 3: air flow crushing; The driving motor is started to drive the fan to work, and the external air is sucked into the fan through the air inlet pipe. After the sucked air is pressurized in the fan, it is transported to the dust filter through the air delivery pipe. The dust filter filters out fine impurities such as dust in the gas, and the purified gas enters the air flow crushing bin through the crushing gas inlet pipe. In the air flow crushing bin, the gas enters the jet ring between the airway top plate and the airway bottom plate, and then is ejected at high speed from multiple groups of crushing jet ports on the peripheral side. At this time, the larger particle materials entering the air flow crushing bin from the feed one-way pipe collide and rub against each other under the impact of the high-speed airflow, and are crushed into finer particles to meet the requirements for the particle size of the material. The crushed material is discharged from the second discharge pipe at the bottom of the air flow crushing bin. The second one-way valve at the bottom of the second discharge pipe ensures that the material can only flow downward and fall into the mixing tank through the feed port to prepare for mixing and stirring; Step 4: Mix and stir; When all the materials have entered the mixing tank, the concentric dual-shaft motor is started, and the two main shafts of the concentric dual-shaft motor respectively drive the first connecting shaft and the second connecting shaft to rotate. When the first connecting shaft rotates, the two groups of spiral turning blades are driven to rotate in the turning chamber through the connecting pieces and the connecting frame on both sides, so that the materials in the turning chamber are continuously turned upward to enter the top mixing chamber. At the same time, the two groups of scrapers on the connecting frame rotate in the top mixing chamber, and one side of the scraper contacts the inner wall of the mixing tank body to scrape the materials on the inner wall of the top mixing chamber to re-mix them. The guide hood can guide the materials in the top mixing chamber to flow to the inner mixing chamber. When the second connecting shaft rotates, it drives the three groups of first stirring frames in the top mixing chamber and the two groups of second stirring frames in the inner mixing chamber. The three groups of first stirring plates in the first stirring frame rotate synchronously to stir and mix the materials in the top mixing chamber, and at the same time, the three groups of first stirring plates are all oriented toward the second connecting shaft, so that the materials in the top mixing chamber are close to the second connecting shaft and fall into the inner mixing chamber under the action of gravity; the three groups of second stirring plates stir the materials in the inner mixing chamber, and at the same time, the three groups of second stirring plates are all oriented toward the bottom of the inner mixing chamber, so that the materials move toward the bottom of the inner mixing chamber, and the bottom end of the second connecting shaft is connected to a pushing plate, and the pushing plate rotates to push the materials at the bottom of the inner mixing chamber to the connecting groove, so that the materials enter the turning chamber through the connecting groove, thereby realizing the circulation of materials between different chambers, and ensuring that various materials are fully and evenly mixed in the mixing tank body; Step 5: Material processing after mixing; After the materials are mixed evenly, the first one-way valve at the bottom of the mixing tank is opened to discharge the mixed materials through the first discharge pipe.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the setting of the screening component, when using the device, the material can be screened by the coarse filter plate and the fine filter plate distributed above and below before entering the mixing tank body. The material blocks that do not meet the particle size requirements will be sent to the external crusher through the return port by the coarse filter plate and crushed again. The larger particles of material enter the air flow crushing component and are crushed by high-speed air flow, which solves the problem of uneven mixing of materials with large particle size differences in traditional mixing devices, so that the particle size of the material entering the mixing tank body is uniform, ensuring the uniformity of the internal components of the magnet and improving stability.

[0016] 2. Through the setting of the stirring assembly, the concentric dual-axis motor drives the first connecting shaft and the second connecting shaft to rotate, and cooperates with multiple groups of stirring components to operate; the first and second stirring frames stir in the top mixing chamber and the inner mixing chamber respectively, and the first stirring plate and the second stirring plate thereon are set at an angle to guide the orderly flow of materials, and the pushing plate can push the material at the bottom of the inner mixing chamber to the connecting groove to make it enter the turning chamber, and the spiral turning blade turns the material in the turning chamber and transports it from the bottom of the turning chamber to the top mixing chamber, so that the material can circulate in different chambers to ensure that various materials are fully and evenly mixed in the mixing tank body; through the setting of two groups of scrapers, the material on the wall of the top mixing chamber can be scraped off to prevent accumulation.

[0017] 3. Through the setting of the air flow crushing component, when the device is used, after the larger particles of material enter the air flow crushing bin, the fan is started to input gas through the crushing gas inlet pipe, and the input gas is ejected at high speed from multiple groups of crushing jet ports on the side of the jet ring. The larger particles of material collide and rub against each other under the impact of the high-speed airflow and are crushed into finer particles to meet the requirements for material particle size. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the structure of the first embodiment of the present invention after assembly; Figure 2 is a schematic diagram of the structure of the first embodiment of the present invention after expansion; Figure 3 It is a schematic diagram of the structure after the stirring assembly of the present invention is disassembled; Figure 4 It is a schematic diagram of the structure after the first connecting shaft and the second connecting shaft are separated in the present invention; Figure 5 It is a schematic diagram of the structure after the second connecting shaft and the pushing plate in the present invention are separated; Figure 6 is a front view of the present invention; Figure 7 yes Figure 6 Sectional view of AA in the middle; Figure 8 It is a schematic diagram of the structure of the airflow crushing component after being disassembled in the present invention; Fig. 9 It is a schematic diagram of the structure of the airflow crushing bin after assembly in the present invention; Fig.10 It is a schematic diagram of the structure after the airflow crushing bin in the present invention is split; Fig.11 It is a schematic diagram of the structure of the screening assembly after assembly in the present invention; Fig.12 It is a schematic diagram of the structure of the screening component after being disassembled in the present invention; Fig.13This is a schematic diagram of the structure of the screening assembly after assembly in the second embodiment of the present invention; Fig.14 This is a schematic diagram of the structure of the screening assembly after being disassembled in the second embodiment of the present invention; Fig.15 The invention discloses a flow chart of the steps of a mixing method of a mixing device for producing NdFeB magnets.

[0019] In the figure, the corresponding relationship between the component names and the figure numbers is as follows: 101, mixing tank; 102, top cover; 103, feed port; 104, second feed pipe; 105, first check valve; 106, first discharge pipe; 201, screening box; 202, feed check pipe; 203, first feed pipe; 204, return pipe; 205, third mounting seat; 206, screening slot; 207, feed hopper; 208, coarse filter plate; 209, fine filter plate; 210, return port; 211, grinding port; 213, mounting block; 214, First collecting cover; 215, second collecting cover; 216, partition plate; 217, mounting plate; 218, eccentric motor; 219, sliding slot; 220, movable rod; 221, T-shaped plate; 222, limit seat; 223, limit slot; 224, third collecting cover; 225, fourth collecting cover; 301, air flow crushing chamber; 302, fan; 303, dust filter; 304, second mounting seat; 305, mounting bracket; 306, drive motor; 307, air supply pipe; 308, crushing gas inlet pipe; 309, inlet pipe; 310, pressure regulating valve; 311, crushing tank; 312, airway top plate; 313, airway bottom plate; 314, jet ring; 315, crushing jet port; 316, second discharge pipe; 317, second one-way valve; 401, separation cover; 402, spiral turning blade; 403, inner mixing chamber; 404, turning chamber; 405, top mixing chamber; 406, concentric dual-axis motor; 407, first mounting seat; 40 8. First connecting shaft; 409. Second connecting shaft; 410. Mounting hole; 411. Sealing sleeve; 412. Connecting piece; 413. Connecting frame; 414. Scraper; 415. Guide cover; 416. First connecting seat; 417. First stirring frame; 418. First connecting rod; 419. First stirring plate; 420. Second connecting seat; 421. Second connecting rod; 422. Second stirring frame; 423. Second stirring plate; 424. Connecting groove; 425. Pushing plate. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but cannot be used to limit the scope of protection of the present invention.

[0021] Embodiment 1: As shown in the attached Figures 1 to 15 As shown: The present invention provides a mixing device for producing NdFeB magnets, comprising a mixing tank body 101, wherein a detachable top cover 102 is arranged on the top of the mixing tank body 101, which provides convenience for daily maintenance, cleaning and inspection of internal components of the device, wherein a screening component and an air flow crushing component are arranged on the top of the top cover 102, which are respectively responsible for screening and crushing materials to ensure that the quality of the materials entering the mixing tank body 101 meets the standards and the particle size is uniform, wherein the screening component comprises a screening box 201, wherein the screening box 201 is arranged on the top of the top cover 102, wherein the air flow crushing component comprises an air flow crushing bin 301, wherein one side of the screening box 201 is connected to the air flow crushing bin 301, wherein a stirring chamber is arranged in the mixing tank body 101, wherein a stirring component is arranged in the stirring chamber, wherein the stirring component comprises a separator The partition cover 401 and two groups of spiral turning blades 402, the partition cover 401 divides the stirring chamber into three different areas: an inner mixing chamber 403, a turning chamber 404 and a top mixing chamber 405. A plurality of connecting grooves 424 are provided at the bottom of the partition cover 401. The inner mixing chamber 403 and the turning chamber 404 are connected through the plurality of connecting grooves 424, so that the materials can circulate between different chambers to avoid the accumulation of materials or uneven mixing. The two groups of spiral turning blades 402 are both located in the turning chamber 404, and are used to transport the materials at the bottom of the turning chamber 404 to the top mixing chamber 405. The bottom of the mixing tank body 101 is connected to the first discharge pipe 106 through the first one-way valve 105. The setting of the first one-way valve 105 prevents backflow or leakage of materials.

[0022] Please refer to Figure 3 and Figure 7 As shown, the top of the inner mixing chamber 403 and the turning chamber 404 are both connected to the top mixing chamber 405, and the stirring assembly also includes a concentric double-shaft motor 406 as a driving source to provide a stable power input for the stirring operation; a first mounting seat 407 is provided on the top of the top cover 102 to provide a mounting base for the concentric double-shaft motor 406, and a concentric double-shaft motor 406 is provided on the top of the first mounting seat 407 to ensure the stability of the motor during operation; a first connecting shaft 408 and a second connecting shaft 409 are provided in the stirring chamber as power transmission components, and the first connecting shaft 408 is provided on the top A through hole is provided on the top cover 102 to accommodate the second connecting shaft 409, and the second connecting shaft 409 can be rotatably inserted into the through hole. Corresponding mounting holes 410 are provided on the top cover 102 and the first mounting seat 407 to provide a through path for the two sets of main shafts of the concentric dual-axis motor 406. The two sets of main shafts of the concentric dual-axis motor 406 pass through the two sets of mounting holes 410 and are respectively connected to the first connecting shaft 408 and the second connecting shaft 409. In order to prevent the material from overflowing through the mounting hole 410 during the mixing process, a sealing sleeve 411 is arranged in the mounting hole 410 on the top cover 102.

[0023] Please refer to Figure 4As shown, two groups of connecting pieces 412 are symmetrically arranged on both sides of the first connecting shaft 408, and the corresponding ends of the two groups of connecting pieces 412 are connected to the connecting frames 413 by screws. The bottoms of the two groups of connecting frames 413 are respectively connected to the two groups of spiral turning leaves 402. When the first connecting shaft 408 is driven by the concentric dual-axis motor 406 to rotate, the power is transmitted to the spiral turning leaves 402 through the connecting pieces 412 and the connecting frames 413 in sequence, driving them to rotate; during the rotation process, the two groups of spiral turning leaves 402 turn over the materials in the turning chamber 404, and transport them from the bottom of the turning chamber 404 to the top mixing chamber 405, so that the materials can circulate in different chambers Two groups of scrapers 414 are respectively arranged on the corresponding sides of the two groups of connecting frames 413, and the two groups of scrapers 414 are both located in the top mixing chamber 405. One side of the two groups of scrapers 414 is in contact with the inner wall of the mixing tank body 101. The two groups of scrapers 414 rotate synchronously with the connecting frames 413 to scrape off the materials attached to the inner wall of the top mixing chamber 405, so as to make them return to the mixing process. The bottom ends of the two groups of connecting frames 413 are respectively provided with guide covers 415 facing the inner mixing chamber 403 corresponding to the spiral turning blades 402, which guide the materials turned from the turning chamber 404 to the top mixing chamber 405 to flow to the inner mixing chamber 403, thereby ensuring the circulation of materials between different chambers and improving the mixing effect.

[0024] Please refer to Figure 5As shown, two groups of first connecting seats 416 are arranged on the second connecting shaft 409 corresponding to the top mixing chamber 405, three groups of first stirring frames 417 are arranged in the top mixing chamber 405, and three groups of first stirring plates 419 facing the second connecting shaft 409 are arranged in the first stirring frame 417. One side of the three groups of first stirring frames 417 is respectively connected to the two groups of first connecting seats 416 through two groups of first connecting rods 418. When the second connecting shaft 409 rotates, the three groups of first stirring frames 417 are driven to rotate synchronously. The three groups of first stirring plates 419 in the first stirring frame 417 play a stirring function to stir the material in the top mixing chamber 405, and the three groups of first stirring plates 419 are all facing the second connecting shaft 409. Under the action of the first stirring plates 419, the material gathers toward the second connecting shaft 409 and falls into the inner mixing chamber 403 under the action of gravity, so as to realize the orderly transfer of the material between the chambers. Similarly, the second connecting shaft 409 also corresponds to the inner The mixing chamber 403 is provided with two groups of second connecting seats 420, and the two sides of the two groups of second connecting seats 420 are connected to second stirring frames 422 through two groups of second connecting rods 421. The second stirring frames 422 are provided with three groups of second stirring plates 423 facing the bottom of the inner mixing chamber 403, which can stir the material in the inner mixing chamber 403 and push the material to the bottom. In addition, the pushing plates 425 corresponding to the multiple groups of connecting grooves 424 are arranged at the bottom of the second connecting shaft 409. According to the material circulation demand, the pushing plates 425 rotate with the second connecting shaft 409 to push the material near the connecting groove 424 at the bottom of the inner mixing chamber 403 to the vicinity of the connecting groove 424, so as to help the material enter the turning chamber 404 through the connecting groove 424, so that the material circulates smoothly between different chambers, further improving the uniformity of material mixing. One side of the two groups of second stirring frames 422 are in contact with the inner wall of the partition cover 401, and the material attached to the inner wall of the partition cover 401 can be scraped off.

[0025] Please refer to Figure 8As shown, the air flow pulverizing component also includes a fan 302 and a dust filter 303. A second mounting seat 304 is arranged on the top of the top cover 102. The dust filter 303 is connected to the top of the second mounting seat 304 by screws, providing a stable installation point for the dust filter 303. A mounting bracket 305 is arranged on one side of the mixing tank body 101. The fan 302 is mounted on the mounting bracket 305 to provide a solid support for the fan 302. The driving motor 306 at the bottom of the fan 302 serves as a power source. After starting, the fan 302 is driven to operate. External gas is continuously sucked into the fan 302 through the intake pipe 309 on the air inlet. The inhaled gas The gas is pressurized in the fan 302 and then transported to the dust filter 303 through the air pipe 307 connected to the top of the fan 302. The dust filter 303 intercepts fine impurities such as dust in the gas to ensure that the purity of the gas entering the air flow crushing bin 301 meets the standard; the purified gas smoothly enters the air flow crushing bin 301 through the crushing gas inlet pipe 308 to provide power support for material crushing; a pressure regulating valve 310 is provided on the air pipe 307, and the operator can adjust the pressure regulating valve 310 according to actual production needs to control the gas pressure and then adjust the air flow crushing intensity to adapt to the crushing requirements of different materials.

[0026] Please refer to Fig. 9 and Fig.10 As shown, a crushing tank 311 is arranged in the air flow crushing bin 301, and the screening component is connected to the crushing tank 311 through the feed one-way pipe 202. An airway top plate 312 and an airway bottom plate 313 are arranged in the crushing tank 311. The airway top plate 312 and the airway bottom plate 313 are connected through an injection ring 314. A through hole connected to the crushing gas inlet pipe 308 is arranged on the top of the airway top plate 312 to provide an entrance for the purified gas to enter the injection ring 314. A plurality of crushing injection ports 315 are arranged on the peripheral side of the injection ring 314. When the gas is ejected at a high speed from the crushing injection port 315, according to the gas-solid two-phase flow principle, the gas is crushed. A high-intensity impact environment is created in the groove 311. The material particles collide and rub against each other violently based on the principles of collision crushing and friction wear, and are gradually refined to a particle size that meets the production requirements of NdFeB magnets. A second discharge pipe 316 is provided at the bottom of the air flow crushing bin 301 as an output channel for the crushed material. A second one-way valve 317 is provided at the bottom of the second discharge pipe 316 to ensure that the material only flows downward. A feed port 103 is provided on the top of the top cover 102, and the bottom end of the second one-way valve 317 is connected to the feed port 103. The material falls into the mixing tank body 101 through the feed port 103 at the top of the top cover 102 to prepare for mixing.

[0027] Please refer to Fig.11 and Fig.12As shown, the screening component also includes a first feed pipe 203 and a return pipe 204, a third mounting seat 205 is arranged on the top of the top cover 102, a screening box 201 is arranged on the top of the third mounting seat 205, a screening slot 206 is provided on the top of the screening box 201, a feed hopper 207 is arranged on the top of the screening slot 206, and the feed hopper 207 is funnel-shaped, which is convenient for operators to pour various materials weighed according to the formula of the NdFeB magnet into the screening slot 206, and the screening slot 206 is provided with a coarse filter plate 208 and a fine filter plate 209 distributed up and down to implement particle size screening for the material; the coarse filter plate 208 has a larger sieve hole, which is responsible for intercepting large pieces of material with excessive particle size, and the fine filter plate 209 has a smaller sieve hole, which intercepts relatively large particles of material to ensure that only qualified particle size materials pass through; a return port 210 and a grinding port 211 are provided on one side of the screening box 201 corresponding to the coarse filter plate 208 and the fine filter plate 209, which are used for materials of different particle sizes. Different outlets are planned for the materials. One end of the return pipe 204 is connected to the return port 210, and the other end is connected to an external crusher. The material blocks that do not meet the particle size requirements intercepted by the coarse filter plate 208 are transported to the external crusher through the return port 210 and the return pipe 204 according to the material recovery and reuse process for re-crushing. One side of the grinding port 211 is connected to the airflow crushing component through the feed one-way pipe 202. The larger particles intercepted by the fine filter plate 209 enter the airflow crushing bin 301 through the grinding port 211 and the feed one-way pipe 202 for further crushing. The discharge port opened at the bottom of the screening box 201 serves as the outlet for qualified materials. A first feed pipe 203 is provided at the bottom of the discharge port, and a second feed pipe 104 is also provided on the top of the top cover 102. The bottom end of the first feed pipe 203 is connected to the second feed pipe 104. Qualified material particles fall into the mixing tank body 101 through this channel for mixing.

[0028] Please refer to Fig.12As shown, in order to ensure the stable installation of the coarse filter plate 208 and the fine filter plate 209 in the screening box 201, two groups of mounting blocks 213 are arranged on the inner walls on both sides of the screening slot 206, and the two ends of the coarse filter plate 208 and the fine filter plate 209 are respectively connected to the four groups of mounting blocks 213, to ensure that the filter plates have no shaking or displacement risks during long-term screening operations, and to ensure the stability of the screening effect; two groups of first collecting covers 214 are arranged on one side of the screening box 201 corresponding to the return port 210 and the grinding port 211, and the two groups of first collecting covers 214 are respectively connected to the feed one-way pipe 202 and the return pipe 204, to collect the intercepted materials and guide them to smoothly enter the opposite The corresponding pipeline, the material intercepted by the coarse filter plate 208 enters the return pipe 204 through the corresponding first collecting cover 214, and the larger particle material intercepted by the fine filter plate 209 enters the feed one-way pipe 202 through the corresponding first collecting cover 214; the second collecting cover 215 is installed at the bottom of the screening box 201 corresponding to the discharge port, and a through groove is provided on the top of the third mounting seat 205 corresponding to the second collecting cover 215 to provide an installation space for the second collecting cover 215, and the second collecting cover 215 is connected to the top of the first feeding pipe 203 through the through groove, and the qualified material particles falling from the discharge port are transported to the mixing tank body 101 through the first feeding pipe 203.

[0029] Please refer to Fig.13 and Fig.14 As shown, a partition plate 216 is provided in the screening slot 206, the coarse filter plate 208 and the fine filter plate 209 are both located on one side of the partition plate 216, a mounting plate 217 is provided on the third mounting seat 205, an eccentric motor 218 is provided on the top of the mounting plate 217, and sliding grooves 219 are provided at the bottom of the third mounting seat 205 and the screening box 201, and slidable movable rods 220 are provided in the two sets of sliding grooves 219, and the bottom ends of the two sets of movable rods 220 are connected to the T-shaped plate 221, and the main shaft of the eccentric motor 218 is rotatably connected to the T-shaped plate 221, and the bottoms of the two sets of sliding grooves 219 are provided with limited seats 222, the two groups of movable rods 220 are provided with limiting grooves 223, the two groups of limiting seats 222 are slidably connected with the two groups of limiting grooves 223, the top ends of the two groups of movable rods 220 are respectively connected with the coarse filter plate 208 and the fine filter plate 209, and two groups of third collecting covers 224 are provided on the other side of the partition plate 216 corresponding to the return port 210 and the grinding port 211, and the two groups of third collecting covers 224 are provided with a first through hole on one side, and a fourth collecting cover 225 is provided at the bottom of the fine filter plate 209, and a second through hole is provided at the bottom of the fourth collecting cover 225 corresponding to the discharge port, and a through groove is provided on one side of the partition plate 216 corresponding to the fine filter plate 209.

[0030] A mixing method of a mixing device for producing NdFeB magnets comprises the following steps: Step 1: Material delivery; Weigh the various materials required according to the formula of the NdFeB magnet, and pour the materials into the screening slot 206 of the screening box 201 through the feed hopper 207. During the feeding process, pay attention to the flow rate of the materials at all times to avoid the accumulation and blockage of the materials in the screening slot 206 due to pouring too fast, thereby affecting the normal progress of the subsequent screening process; Step 2: Material screening; After the material enters the screening slot 206 of the screening box 201, it passes through the coarse filter plate 208 and the fine filter plate 209 distributed above and below in sequence. The sieve hole size of the coarse filter plate 208 is relatively large, and is used to intercept those large pieces of material that obviously do not meet the particle size requirements. The large pieces of material are discharged through the return pipe 204 along the return port 210. The other end of the return pipe 204 is connected to an external crusher. These intercepted large pieces of material will be transported to the external crusher and crushed again to refine their particle size; while the material that has passed the coarse filter plate 208 continues to be discharged. The downward flow encounters the fine filter plate 209, which has a small mesh and can intercept relatively large particles. These large particles intercepted by the fine filter plate 209 enter the air flow crushing chamber 301 through the grinding port 211 and the feed one-way pipe 202 connected thereto; at the same time, the qualified material particles screened by the coarse filter plate 208 and the fine filter plate 209 fall into the mixing tank body 101 from the discharge port at the bottom of the screening box 201 through the channel formed by the first feed pipe 203 and the second feed pipe 104; Step 3: air flow crushing; When there is material that needs to be air flow crushed, the drive motor 306 is started to drive the fan 302 to work, and the external air is sucked into the fan 302 through the air inlet pipe 309. After the sucked gas is pressurized in the fan 302, it is transported to the dust filter 303 through the air supply pipe 307 connected at the top. The dust filter 303 intercepts fine impurities such as dust in the gas to ensure that the purity of the gas entering the air flow crushing bin 301 meets the standard and prevents impurities from mixing into the material and affecting the quality of the magnet; the gas purified by the dust filter enters the air flow crushing bin 301 through the crushing gas inlet pipe 308. In the air flow crushing bin 301, the gas enters the jet ring between the airway top plate 312 and the airway bottom plate 313. 314, and then ejected at high speed from multiple groups of crushing jets 315 on the side, creating a high-intensity impact environment in the crushing tank 311. At this time, the larger particles of materials entering the airflow crushing bin 301 from the feed one-way pipe 202 collide and rub against each other under the impact of the high-speed airflow, and are crushed into finer particles to meet the requirements for the particle size of the materials; the crushed materials are discharged from the second discharge pipe 316 at the bottom of the airflow crushing bin 301, and the second one-way valve 317 at the bottom of the second discharge pipe 316 ensures that the materials can only flow downward, so that they fall into the mixing tank body 101 through the feed port 103 on the top of the top cover 102, and gather together with the qualified materials that entered previously, ready for mixing; Step 4: Mix and stir; When all the materials enter the mixing tank 101, the concentric double-shaft motor 406 is started. The two sets of main shafts of the concentric double-shaft motor 406 serve as power output ends, respectively driving the first connecting shaft 408 and the second connecting shaft 409 connected thereto to rotate; when the first connecting shaft 408 rotates, the two sets of spiral turning blades 402 are driven to rotate in the turning chamber 404 through the connecting pieces 412 and the connecting frame 413 on both sides, and the two sets of spiral turning blades 402 are driven to rotate in the turning chamber 404. During the rotation process, the materials in the turning chamber 404 are continuously turned upwards so that they enter the top The mixing chamber 405 realizes the preliminary transfer of materials between different chambers; at the same time, the two sets of scrapers 414 also rotate with the connection frame 413, and one side of the scraper 414 is attached to the inner wall of the mixing tank body 101, which can scrape off the materials on the inner wall of the top mixing chamber 405. The guide cover 415 provided at the bottom of the connection frame 413 corresponding to the spiral turning blade 402 can guide the materials turned up from the turning chamber 404 and gathered in the top mixing chamber 405 to flow to the inner mixing chamber 403 according to the flow direction of the materials, thereby ensuring the smoothness and orderliness of the circulation of the materials between the chambers; the second connecting shaft 4 When the shaft 409 rotates, the three groups of first stirring racks 417 in the top mixing chamber 405 and the two groups of second stirring racks 422 in the inner mixing chamber 403 are driven to rotate synchronously. The three groups of first stirring plates 419 on the first stirring rack 417 stir the materials in the top mixing chamber 405. Since the three groups of first stirring plates 419 are all facing the second connecting shaft 409, during the stirring process, the materials gather toward the second connecting shaft 409 and naturally fall into the inner mixing chamber 403 under the action of gravity, so as to realize the transfer of materials between chambers. Similarly, the three groups of second stirring plates 423 on the second stirring rack 422 stir the materials in the top mixing chamber 405. The material in the inner mixing chamber 403 is stirred, and the three groups of second stirring plates 423 are all facing the bottom of the inner mixing chamber 403 to push the material to the bottom. In addition, the pushing plates 425 arranged at the bottom of the second connecting shaft 409 correspond to the multiple groups of connecting grooves 424. As the second connecting shaft 409 rotates, the material at the bottom of the inner mixing chamber 403 is pushed to the vicinity of the connecting grooves 424, which helps the material to smoothly pass through the connecting grooves 424 into the turning chamber 404, so as to realize the continuous circulation of the material between different chambers, and so on and so forth, so as to ensure that various materials are fully and evenly mixed in the mixing tank body 101; Step 5: Material processing after mixing; After the materials are mixed evenly, the first one-way valve 105 at the bottom of the mixing tank 101 is opened to discharge the mixed materials through the first discharge pipe 106 .

[0031] Embodiment 2: Based on the mixing device and mixing method for producing NdFeB magnets provided in Embodiment 1 of the present application, Embodiment 2 of the present application proposes a mixing device and mixing method for producing NdFeB magnets. This Embodiment 2 is only a preferred embodiment of Embodiment 1, and the implementation of Embodiment 2 will not affect the independent implementation of Embodiment 1. The second embodiment 2 of the present invention will be further described below.

[0032] Please refer to Fig.13 and Fig.14 As shown, a partition plate 216 is provided in the screening slot 206 to separate the space in the screening slot 206. The coarse filter plate 208 and the fine filter plate 209 are both located on the same side of the partition plate 216. A mounting plate 217 is provided on the third mounting seat 205. An eccentric motor 218 is provided on the top of the mounting plate 217. Two sets of sliding slots 219 are provided at corresponding positions of the third mounting seat 205 and the bottom of the screening box 201. The two sets of sliding slots 219 are both provided with slidable movable The bottom ends of the two groups of movable rods 220 are connected to the T-shaped plate 221. The main shaft of the eccentric motor 218 is rotatably connected to the T-shaped plate 221. In order to ensure the stability of the movable rod 220 during the reciprocating sliding process, a limited seat 222 is provided at the bottom of the two groups of sliding grooves 219. Correspondingly, the two groups of movable rods 220 are provided with a limited groove 223. The limited seat 222 is slidably connected to the limited groove 223. The top ends of the two groups of movable rods 220 are respectively connected to the coarse filter plate 20 8 is connected to the fine filter plate 209. When the eccentric motor 218 is started, the rotational motion of the main shaft is converted into the reciprocating linear motion of the T-shaped plate 221, and then the vibration force is transmitted to the upper coarse filter plate 208 and the fine filter plate 209 through the movable rod 220; the other side of the partition plate 216 is provided with two sets of third collecting covers 224 corresponding to the return port 210 and the grinding port 211 to collect the materials that have not passed through the coarse filter plate 208 or the fine filter plate 209. One side of the partition plate 216 corresponds to the fine filter plate 2 09 is provided with a through slot, so that the larger particle size materials that have not passed through the fine filter plate 209 fall into one of the third collecting covers 224 through the through slot; a first through hole is provided on one side of the two groups of third collecting covers 224, which are respectively connected to the return pipe 204 and the feed one-way pipe 202, and a fourth collecting cover 225 is provided at the bottom of the fine filter plate 209, which is responsible for collecting qualified materials after being screened by the fine filter plate 209, and a second through hole is provided at the bottom of the fourth collecting cover 225 to communicate with the discharge port.

[0033] Compared with the filtering method in the first embodiment which only relies on the stationary coarse filter plate 208 and the fine filter plate 209, the second embodiment installs an eccentric motor 218 on the mounting plate 217, connects its main shaft to the T-shaped plate 221, and respectively connects to the coarse filter plate 208 and the fine filter plate 209 through two groups of movable rods 220. The main difference is that the coarse filter plate 208 and the fine filter plate 209 can be vibrated along the two groups of sliding grooves 219 by starting the eccentric motor 218. Compared with the stationary filtering method, this vibration mode can effectively break the agglomeration force that may exist between the material particles, promote the material to be quickly and evenly dispersed on the surface of the filter plate, improve the filtering efficiency, and reduce the filtering time. Therefore, compared with the filtering method with the stationary coarse filter plate 208 and the fine filter plate 209, this vibration screening method can use the vibration force to break up the material, prevent it from clogging in the filter hole and affecting the filtering effect, and ensure the continuity and stability of the screening process; the other conditions are consistent with the first embodiment, so this embodiment will not be repeated.

[0034] The embodiments described above 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 may be replaced by equivalents. Such 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, and should all be included in the protection scope of the present invention.

Claims

1. A mixing device for producing NdFeB magnets, comprising a mixing tank (101), characterized in that: A detachable top cover (102) is arranged on the top of the mixing tank body (101), a screening component and an airflow crushing component are arranged on the top of the top cover (102), the screening component comprises a screening box (201), the screening box (201) is arranged on the top of the top cover (102), the airflow crushing component comprises an airflow crushing bin (301), one side of the screening box (201) is connected to the airflow crushing bin (301), a stirring chamber is arranged in the mixing tank body (101), a stirring component is arranged in the stirring chamber, and the stirring component comprises A partition cover (401) and two groups of spiral turning blades (402), wherein the partition cover (401) divides the stirring chamber into an inner mixing chamber (403), a turning chamber (404) and a top mixing chamber (405), and a plurality of connecting grooves (424) for connecting the inner mixing chamber (403) and the turning chamber (404) are provided at the bottom end of the partition cover (401), and the two groups of spiral turning blades (402) are both located in the turning chamber (404), and the bottom of the mixing tank body (101) is connected to a first discharge pipe (106) via a first one-way valve (105).

2. A mixing device for producing NdFeB magnets according to claim 1, characterized in that: The inner mixing chamber (403) and the top of the material turning chamber (404) are both connected to the top mixing chamber (405); the stirring assembly further comprises a concentric dual-shaft motor (406); a first mounting seat (407) is arranged on the top of the top cover (102); the concentric dual-shaft motor (406) is arranged on the top of the first mounting seat (407); a first connecting shaft (408) and a second connecting shaft (409) are arranged in the stirring chamber; a through hole is provided on the top of the first connecting shaft (408); the second connecting shaft (409) is inserted into the through hole; mounting holes (410) are provided on the top cover (102) and the first mounting seat (407); two groups of main shafts of the concentric dual-shaft motor (406) pass through the two groups of mounting holes (410) and are respectively connected to the first connecting shaft (408) and the second connecting shaft (409); a sealing sleeve (411) is provided in the mounting hole (410) on the top cover (102).

3. A mixing device for producing NdFeB magnets according to claim 2, characterized in that: Connecting members (412) are provided on both sides of the first connecting shaft (408), and connecting frames (413) are provided at corresponding ends of the two groups of connecting members (412). The bottom ends of the two groups of connecting frames (413) are respectively connected to the two groups of spiral turning blades (402), and the two groups of spiral turning blades (402) are in contact with the inner wall of the mixing tank body (101) and the outer side of the partition cover (401); two groups of scrapers (414) are provided on the corresponding sides of the two groups of connecting frames (413), and the two groups of scrapers (414) are located in the top mixing chamber (405), and one side of the two groups of scrapers (414) is in contact with the inner wall of the mixing tank body (101), and the bottom ends of the two groups of connecting frames (413) are provided with guide covers (415) facing the inner mixing chamber (403) corresponding to the spiral turning blades (402).

4. A mixing device for producing NdFeB magnets according to claim 2, characterized in that: Two groups of first connecting seats (416) are arranged on the second connecting shaft (409) corresponding to the top mixing chamber (405), and three groups of first stirring racks (417) are arranged in the top mixing chamber (405). One side of the three groups of first stirring racks (417) is connected to the two groups of first connecting seats (416) respectively through two groups of first connecting rods (418), and three groups of first stirring plates (419) facing the second connecting shaft (409) are arranged in the first stirring rack (417). The second connecting shaft (409) is also provided with a first stirring plate (419) corresponding to the inner mixing chamber (405). The mixing chamber (403) is provided with two groups of second connecting seats (420), and both sides of the two groups of second connecting seats (420) are connected to second stirring frames (422) through two groups of second connecting rods (421). The second stirring frames (422) are provided with three groups of second stirring plates (423) facing the bottom of the inner mixing chamber (403). The bottom end of the second connecting shaft (409) is provided with a pushing plate (425) corresponding to the multiple groups of connecting grooves (424). One side of the two groups of second stirring frames (422) is in contact with the inner wall of the partition cover (401).

5. A mixing device for producing NdFeB magnets according to claim 1, characterized in that: The airflow pulverizing assembly further comprises a fan (302) and a dust filter (303); a second mounting seat (304) is arranged on the top of the top cover (102); the dust filter (303) is connected to the top of the second mounting seat (304) by screws; a mounting bracket (305) is arranged on one side of the mixing tank body (101); the fan (302) is mounted on the mounting bracket (305); a driving motor (306) is arranged on the bottom of the fan (302); one end of an air supply pipe (307) is connected to the top; the other end of the air supply pipe (307) is connected to the dust filter (303); one side of the dust filter (303) is connected to the airflow pulverizing bin (301) via a pulverizing gas inlet pipe (308); an air inlet pipe (309) connected to an external air path is arranged on the air inlet of one side of the fan (302); and a pressure regulating valve (310) is arranged on the air supply pipe (307).

6. A mixing device for producing NdFeB magnets according to claim 5, characterized in that: A pulverizing trough (311) is provided in the airflow pulverizing bin (301); the screening assembly is connected to the pulverizing trough (311) via a feed one-way pipe (202); an airway top plate (312) and an airway bottom plate (313) are provided in the pulverizing trough (311); the airway top plate (312) and the airway bottom plate (313) are connected via an air jet ring (314); a through hole connected to the pulverizing gas inlet pipe (308) is provided at the top of the airway top plate (312); a plurality of groups of pulverizing jet ports (315) are provided on the circumference of the air jet ring (314); a second discharge pipe (316) is provided at the bottom of the airflow pulverizing bin (301); a second one-way valve (317) is provided at the bottom end of the second discharge pipe (316); a feed port (103) is provided at the top of the top cover (102); the bottom end of the second one-way valve (317) is connected to the feed port (103).

7. A mixing device for producing NdFeB magnets according to claim 1, characterized in that: The screening assembly further comprises a first feed pipe (203) and a return pipe (204); a third mounting seat (205) is arranged on the top of the top cover (102); the screening box (201) is arranged on the top of the third mounting seat (205); a screening slot (206) is provided on the top of the screening box (201); a feed hopper (207) is provided on the top of the screening slot (206); a coarse filter plate (208) and a fine filter plate (209) are arranged in the screening slot (206) and are distributed up and down; and a side of the screening box (201) is provided with a filter element corresponding to the coarse filter plate (208) and the fine filter plate (209). A return port (210) and a grinding port (211) are provided, one end of the return pipe (204) is connected to the return port (210), the other end of the return pipe (204) is connected to an external pulverizer, one side of the grinding port (211) is connected to the airflow pulverizing assembly via a feed one-way pipe (202), a discharge port is provided at the bottom end of the screening box (201), the first feed pipe (203) is provided at the bottom of the discharge port, a second feed pipe (104) is also provided at the top of the top cover (102), the bottom end of the first feed pipe (203) is connected to the second feed pipe (104).

8. A material mixing device for producing NdFeB magnets according to claim 7, characterized in that: Two groups of mounting blocks (213) are provided on the inner walls on both sides of the screening tank (206); the two ends of the coarse filter plate (208) and the fine filter plate (209) are respectively connected to the four groups of mounting blocks (213); two groups of first material collecting covers (214) are provided on one side of the screening box (201) corresponding to the return port (210) and the grinding port (211); the two groups of first material collecting covers (214) are respectively connected to the feed one-way pipe (202) and the return pipe (204); a second material collecting cover (215) is installed at the bottom of the screening box (201) corresponding to the discharge port; a through slot is provided on the top of the third mounting seat (205) corresponding to the second material collecting cover (215); the second material collecting cover (215) passes through the through slot and is connected to the top of the first feed pipe (203).

9. A mixing device for producing NdFeB magnets according to claim 7, characterized in that: A partition plate (216) is provided in the screening slot (206), the coarse filter plate (208) and the fine filter plate (209) are both located on one side of the partition plate (216), a mounting plate (217) is provided on the third mounting seat (205), an eccentric motor (218) is provided on the top of the mounting plate (217), a sliding groove (219) is provided at the bottom of the third mounting seat (205) and the screening box (201), a slidable movable rod (220) is provided in both groups of the sliding grooves (219), the bottom ends of both groups of the movable rods (220) are connected to a T-shaped plate (221), the main shaft of the eccentric motor (218) is rotatably connected to the T-shaped plate (221), and a limit seat (220) is provided at the bottom of both groups of the sliding grooves (219). 22), the two groups of movable rods (220) are provided with limiting grooves (223), the two groups of limiting seats (222) are slidably connected to the two groups of limiting grooves (223), the top ends of the two groups of movable rods (220) are respectively connected to the coarse filter plate (208) and the fine filter plate (209), the other side of the partition plate (216) is provided with two groups of third material collecting covers (224) corresponding to the return port (210) and the grinding port (211), one side of the two groups of third material collecting covers (224) is provided with a first through hole, the bottom of the fine filter plate (209) is provided with a fourth material collecting cover (225), the bottom of the fourth material collecting cover (225) is provided with a second through hole corresponding to the discharge port, and one side of the partition plate (216) is provided with a through groove corresponding to the fine filter plate (209).

10. A mixing method for a mixing device for producing NdFeB magnets according to any one of claims 1 to 9, characterized in that: The following steps are included: Step 1: Material delivery; Weigh various materials required according to the formula of the NdFeB magnet, and pour the materials into the screening slot (206) of the screening box (201) through the feed hopper (207); Step 2: Material screening; The material passes through the coarse filter plate (208) and the fine filter plate (209) arranged above and below in sequence. Material blocks that do not meet the particle size requirements are intercepted by the coarse filter plate (208), discharged through the return port (210) and the return pipe (204), and transported to an external pulverizer for re-pulverization for subsequent reuse. Larger particles of material are intercepted by the fine filter plate (209) and enter the air flow pulverization chamber (301) through the grinding port (211) and the feed one-way pipe (202), while qualified material particles fall into the mixing tank body (101) from the discharge port at the bottom of the screening box (201) through the first feed pipe (203) and the second feed pipe (104); Step 3: air flow crushing; The drive motor (306) is started to drive the fan (302) to work, and external air is sucked into the fan (302) through the air intake pipe (309). The sucked air is pressurized in the fan (302) and then transported to the dust filter (303) through the air delivery pipe (307). The dust filter (303) filters out fine impurities such as dust in the air. The purified gas enters the air flow pulverizing chamber (301) through the pulverizing gas intake pipe (308). In the air flow pulverizing chamber (301), the gas enters the jet ring (314) between the airway top plate (312) and the airway bottom plate (313), and then Then, the materials are ejected at high speed from the multiple groups of pulverizing jet ports (315) on the peripheral side. At this time, the larger particles of materials entering the airflow pulverizing bin (301) from the feed one-way pipe (202) collide and rub against each other under the impact of the high-speed airflow, and are pulverized into finer particles to meet the requirements for the particle size of the materials. The pulverized materials are discharged from the second discharge pipe (316) at the bottom of the airflow pulverizing bin (301). The second one-way valve (317) at the bottom of the second discharge pipe (316) ensures that the materials can only flow downwards and fall into the mixing tank (101) through the feed port (103) to prepare for mixing and stirring. Step 4: Mix and stir; After all the materials have entered the mixing tank (101), the concentric dual-shaft motor (406) is started, and the two main shafts of the concentric dual-shaft motor (406) respectively drive the first connecting shaft (408) and the second connecting shaft (409) to rotate. When the first connecting shaft (408) rotates, the two sets of spiral material turning blades (402) are driven to rotate in the material turning chamber (404) through the connecting pieces (412) and the connecting frame (413) on both sides, so that the materials in the material turning chamber (404) are continuously turned upwards to enter the top mixing chamber (405). At the same time, the connecting pieces (412) and the connecting frame (413) on both sides drive the two sets of spiral material turning blades (402) to rotate in the material turning chamber (404), and the materials in the material turning chamber (404) are continuously turned upwards to enter the top mixing chamber (405). Two groups of scrapers (414) on the frame (413) rotate in the top mixing chamber (405), one side of the scraper (414) contacts the inner wall of the mixing tank body (101), and scrapes the material on the inner wall of the top mixing chamber (405) so that it can be re-mixed. The guide cover (415) can guide the material in the top mixing chamber (405) to flow to the inner mixing chamber (403). When the second connecting shaft (409) rotates, it drives the three groups of first stirring frames (417) in the top mixing chamber (405) and the inner mixing chamber (403) to rotate. The two groups of second stirring frames (422) rotate synchronously, the three groups of first stirring plates (419) in the first stirring frame (417) stir and mix the materials in the top mixing chamber (405), and at the same time, the three groups of first stirring plates (419) are all oriented toward the second connecting shaft (409), so that the materials in the top mixing chamber (405) approach the second connecting shaft (409) and fall into the inner mixing chamber (403) under the action of gravity; the three groups of second stirring plates (423) stir the materials in the inner mixing chamber (403), and at the same time, the three groups of first stirring plates (419) are oriented toward the second connecting shaft (409), so that the materials in the top mixing chamber (405) approach the second connecting shaft (409) and fall into the inner mixing chamber (403) under the action of gravity; The second stirring plates (423) of the group are all facing the bottom of the inner mixing chamber (403), so that the materials move toward the bottom of the inner mixing chamber (403), and the bottom end of the second connecting shaft (409) is connected to a pushing plate (425), and the pushing plate (425) rotates to push the materials at the bottom of the inner mixing chamber (403) to the connecting groove (424), so that the materials enter the turning chamber (404) through the connecting groove (424), thereby realizing the circulation of materials between different chambers and ensuring that various materials are fully and evenly mixed in the mixing tank body (101); Step 5: Material processing after mixing; After the materials are mixed evenly, the first one-way valve (105) at the bottom of the mixing tank (101) is opened to discharge the mixed materials through the first discharge pipe (106).

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