A device for preparing high energy product neodymium iron boron magnets

Abstract

This invention discloses a high-energy-product neodymium iron boron magnet preparation device, belonging to the field of magnet preparation technology. The device includes a mixing cylinder, support legs, discharge port, feed port, drive assembly, stirring shaft, mounting groove, stirring rod, sliding groove, sealing plate, expansion airbag, mounting chamber, and control assembly. By setting a slidable sealing plate and expansion airbag inside the mounting groove, the stirring rod is actively driven to unfold by the expansion airbag. With the connecting rope structure between the stirring rod and the sealing plate, the expansion airbag pushes the sealing plate outward when inflated. The expansion airbag inflates and pushes the sealing plate outward along the sliding groove, completely sealing the opening of the mounting groove. This prevents the high-viscosity magnetic powder and adhesive mixture from entering the groove from the source, completely avoiding the problem of residual material gradually solidifying in the groove, and eliminating the inability of the stirring rod to retract completely due to the accumulation of solidified layer.

Description

Technical Field

[0001] This invention belongs to the field of magnet manufacturing technology, specifically, it relates to a device for manufacturing high-energy-product neodymium iron boron magnets. Background Technology

[0002] Bonded NdFeB magnets, composed of Nd2Fe14B, are a type of synthetic magnet. They are made by mixing rapidly quenched NdFeB magnetic powder with a binder and then molding them through compression molding or injection molding. Bonded magnets offer high dimensional accuracy, allowing for the fabrication of relatively complex magnetic components. They also feature one-time molding and multi-pole orientation. The manufacturing process involves mixing the magnetic powder with the binder, followed by heating, granulation, drying, and then injection into a mold cavity for cooling and molding. Currently, ultrasonic generators are used to mix the magnetic powder with the binder, curing agent, and lubricant. Ultrasonic waves are used to mix the magnetic powder particles with the liquid. Since many additives need to be mixed with the magnetic powder, the mixing time is relatively long when multiple additives need to be thoroughly mixed under ultrasonic waves. Therefore, a stirrer is needed in conjunction with the ultrasonic generator to improve mixing efficiency.

[0003] The invention patent with announcement number CN114005670A discloses a method and apparatus for preparing bonded neodymium iron boron strong magnets. The apparatus includes an ultrasonic generator and a work frame mounted on the side of the ultrasonic generator. A container cup is mounted on the upper end of the work frame, and a telescopic frame is mounted on the rear end. Through the cooperation of a stirring mechanism and an adjusting mechanism, when the ultrasonic generator mixes the magnetic powder and adhesive, the motor is started. The motor causes the stirring shaft to rotate at high speed via a fixed frame and a limiting plate. Simultaneously, the user moves the oscillating frame downwards to move the toothed bevel gear, which activates the transmission component. This causes the transmission component to extend movable rods one and two, allowing the stirring shaft to thoroughly stir the mixture. After stirring, the user scrapes off the material bonded to the surface of the stirring shaft using a scraper, reducing material loss.

[0004] After the stirring rod retracts, a deep groove with the same contour as the stirring rod will inevitably form on the surface of the stirring shaft. The rigid sliding sleeve of the above-mentioned device can only scrape the cylindrical outer surface of the stirring shaft and cannot enter the groove. The high-viscosity magnetic powder and adhesive mixture remaining in the groove will gradually solidify after each production, which will not only cause the loss of magnetic powder in each batch, but also cause the stirring rod to be unable to retract completely, the sliding sleeve to get stuck, or even the stirring shaft to break as the thickness of the solidified layer increases. This cannot be solved by increasing the number of scrapers or adjusting the scraper angle. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] To address the issue raised in the background art where, after the stirring rod retracts, a deep groove inevitably forms on the surface of the stirring shaft, consistent with the contour of the stirring rod, and where the rigid sliding sleeve of the aforementioned device can only scrape the cylindrical outer surface of the stirring shaft and cannot penetrate into the groove, resulting in the high-viscosity magnetic powder and adhesive mixture remaining in the groove gradually solidifying after each production run, this not only causes loss of magnetic powder per batch but also, as the thickness of the solidified layer increases, leads to the stirring rod not being able to retract completely, the sliding sleeve getting stuck, or even the stirring shaft breaking. Furthermore, this problem cannot be solved by increasing the number of scrapers or adjusting the scraper angle. Therefore, the present invention adopts the following technical solution.

[0007] A device for preparing high-energy-product NdFeB magnets includes a mixing cylinder with multiple support legs fixedly connected to its bottom. A discharge port is located at the bottom of the mixing cylinder, and a feed port is located at its upper end. A drive assembly is located at the upper end of the mixing cylinder. A stirring shaft is rotatably connected inside the mixing cylinder, and the drive assembly drives the stirring shaft to rotate. Multiple mounting grooves are provided on the outer wall of the stirring shaft. A stirring rod is rotatably connected to the top inner side of each mounting groove. Sliding grooves are provided on both sides of each mounting groove, and a sealing plate is slidably connected inside the sliding grooves. An expansion airbag is detachably connected to the side of the sealing plate away from the stirring rod, and the other side of the expansion airbag is fixed to the inner wall of the mounting groove. An installation chamber is provided inside the stirring shaft, and a control assembly is installed at the bottom of the stirring shaft. The control assembly is connected to each expansion airbag through the installation chamber. The control assembly controls each expansion airbag to expand or contract simultaneously, causing each expansion airbag to expand and push each sealing plate outward along the path of the sliding groove, thus sealing the mounting groove.

[0008] Preferably, a cleaning component is provided on the outer wall of the stirring shaft, and the cleaning component moves up and down along the outer wall of the stirring shaft to clean the outer wall of the stirring shaft.

[0009] Preferably, the control component includes a first air inlet pipe, a rotating component, a first rotating ring, and a connecting pipe. The rotating component is rotatably connected to the bottom of the stirring shaft and is detachably connected to the bottom of the mixing cylinder. Each expansion air bladder is detachably connected to a first air inlet pipe. The first rotating ring is rotatably connected to the upper end of the rotating component. A first chamber is provided inside the rotating component. The first air inlet pipe communicates with the first chamber. The bottom of the rotating component is connected to two connecting pipes that communicate with the interior of the first chamber. One connecting pipe is connected to an external air compressor, and the other connecting pipe is connected to an external air pump.

[0010] Preferably, each stirring rod is fixedly connected to the sealing plate with a connecting rope. After the inflatable airbag contracts, it works with the connecting rope to pull the stirring rod back to its original position.

[0011] Preferably, each mounting groove is provided with multiple one-way valves on the inner wall side near the opening, a second rotating ring is rotatably connected to the upper center of the rotating part, a second chamber is provided at the center of the rotating part, multiple second air inlet pipes are detachably connected to the upper end of the second rotating ring, the second air inlet pipes are connected to the stirring shaft and communicate with the one-way valves, and a connecting pipe communicating with the interior of the second chamber is fixedly connected to the bottom of the rotating part.

[0012] Preferably, the connecting pipe is connected to an external nitrogen gas source device, and a gas preheater is installed in the pipeline connecting the nitrogen gas source device and the connecting pipe.

[0013] Preferably, the cleaning assembly includes a cleaning ring, a second jet nozzle, and a connecting pipe. The cleaning ring is fitted onto the outer wall of the stirring shaft. A chamfer is provided at the inner outer edge of the bottom of the cleaning ring, and multiple second jet nozzles inclined downward toward the outer wall of the stirring shaft are provided on the chamfer. One end of the connecting pipe is detachably connected to the upper end of the cleaning ring and communicates with each second jet nozzle. The other end of the connecting pipe is connected to a nitrogen gas source device. The connecting pipe is installed at the upper end of the mixing cylinder through a winding reel with a spring reset mechanism. When the cleaning ring descends, the winding reel rotates against the spring force, causing the connecting pipe to extend. When the cleaning ring rises, the winding reel automatically retracts the connecting pipe under the action of the spring. A lifting assembly is installed at the upper end of the mixing cylinder, which causes the cleaning ring to move up and down along the outer wall of the stirring shaft.

[0014] Preferably, the lifting assembly includes a traction rope, a take-up roller, a mounting bracket, and a second servo motor. The mounting bracket is detachably connected to both sides of the upper end of the mixing cylinder. The take-up roller is rotatably connected to the mounting brackets on both sides. The second servo motor is detachably connected to the outer wall of one side of the mounting bracket. The rotating end of the second servo motor is drivenly connected to one end of the take-up roller. One end of the traction rope is detachably connected to the upper end of the cleaning ring. The other end of the traction rope is wound around the take-up roller. The rotation of the second servo motor lengthens the traction rope, causing the cleaning ring to move downward along the outer wall of the stirring shaft.

[0015] Preferably, the drive assembly includes a first servo motor, a first bevel gear, and a second bevel gear. The upper end of the stirring shaft extends out of the mixing cylinder and is fixedly connected to the second bevel gear. The first bevel gear meshes with the second bevel gear. The first servo motor is detachably connected to the upper end of the mixing cylinder. The rotating end of the first servo motor is connected to the first bevel gear for transmission. The rotation of the first servo motor drives the first bevel gear to rotate, and through meshing, drives the second bevel gear to rotate, thereby causing the stirring shaft to rotate.

[0016] Preferably, an ultrasonic generator is provided on one side of the mixing cylinder.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, a sliding sealing plate and an expansion airbag are installed inside the installation groove. The expansion airbag actively drives the stirring rod to unfold. With the help of the connecting rope structure between the stirring rod and the sealing plate, the expansion airbag pushes the sealing plate outward when it is inflated. The expansion airbag inflates and pushes the sealing plate outward along the sliding groove, completely sealing the opening of the installation groove. This prevents the mixture of high-viscosity magnetic powder and adhesive from entering the groove from the source, completely avoiding the problem of residual material gradually solidifying in the groove. It also eliminates the safety hazards of the stirring rod not being able to retract completely, the sliding sleeve getting stuck, or even the stirring shaft breaking due to the accumulation of solidified layer. At the same time, it significantly reduces the loss of magnetic powder per batch and improves the utilization rate of raw materials.

[0018] 2. In this invention, by setting multiple one-way valves on the inner wall of the mounting groove near the opening, during the process of the expansion bladder retracting and resetting the stirring rod after stirring, the preheated nitrogen enters the one-way valve through the second inlet pipe and is sprayed toward the opposite surfaces of the sealing plate and the stirring rod, thus cleaning up the trace materials remaining on the surfaces of both in a timely manner, preventing the materials from solidifying and affecting subsequent use. At the same time, the nitrogen atmosphere can effectively prevent the magnetic powder from oxidizing during the cleaning process, ensuring the performance stability of the magnetic powder and improving the magnetic energy product and consistency of the final magnet.

[0019] 3. In this invention, a cleaning ring with a downward-sloping second jet nozzle cleans the outer wall of the stirring shaft. While the cleaning ring moves up and down along the outer wall of the stirring shaft, high-pressure nitrogen gas is sprayed from the second jet nozzle to thoroughly clean the material adhering to the outer wall of the stirring shaft. The entire cleaning process is without mechanical contact, which will not cause wear to the stirring shaft and the cleaning ring, thus extending the service life of the components. At the same time, the downward-sloping airflow can directly blow the cleaned material into the discharge port, realizing the simultaneous cleaning and discharge, and further reducing the material residue rate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a high-energy-product neodymium iron boron magnet manufacturing device according to the present invention; Figure 2 This is a front view schematic diagram of the neodymium iron boron magnet preparation device in this invention; Figure 3 This is a cross-sectional view of the neodymium iron boron magnet manufacturing apparatus of the present invention; Figure 4 In this invention Figure 3 Enlarged structural diagram of section A; Figure 5 This is a schematic diagram of the stirring assembly structure in this invention; Figure 6 In this invention Figure 5 Enlarged structural diagram of section B; Figure 7 This is a schematic diagram of the stirring rod structure in this invention; Figure 8 In this invention Figure 7 Enlarged structural diagram of section C; Figure 9 In this invention Figure 7 Enlarged structural diagram of section D in the middle; Figure 10 This is a schematic diagram of the cleaning component structure in this invention.

[0021] The correspondence between the labels and component names in the attached figures is as follows: 100. Mixing cylinder; 101. Support leg; 102. Feed inlet; 103. Discharge outlet; 200. Stirring shaft; 201. Stirring rod; 202. Sealing plate; 203. Inflatable air bladder; 204. First air inlet pipe; 205. Second air inlet pipe; 206. Rotating component; 207. First chamber; 208. Second chamber; 209. First rotating ring; 210. Second rotating ring; 211. Mounting groove; 212. Sliding groove; 213. One-way valve for air outlet; 214. Connecting pipe; 215. Connecting rope; 216. Mounting chamber; 300. Drive assembly; 301. First servo motor; 302. First bevel gear; 303. Second bevel gear; 400. Cleaning component; 401. Cleaning ring; 402. Second air nozzle; 403. Traction rope; 404. Take-up roller; 405. Mounting bracket; 406. Second servo motor; 407. Connecting air pipe. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0025] like Figure 1 , Figure 2, Figure 3 as well as Figure 5 The diagram shown is a schematic representation of a high-energy-product NdFeB magnet preparation device according to a preferred embodiment of the present invention. This high-energy-product NdFeB magnet preparation device includes a mixing cylinder 100. Multiple support legs 101 are fixedly connected to the bottom of the mixing cylinder 100. A discharge port 103 is provided at the bottom of the mixing cylinder 100, and a feed inlet 102 is provided at the upper end of the mixing cylinder 100. An ultrasonic generator (not shown in the diagram) is provided on one side of the mixing cylinder 100. The ultrasonic generator can improve the mixing effect of the materials inside the mixing cylinder 100 during the stirring process. The upper end of the mixing cylinder 100 is provided with… A driving assembly 300 is provided, and a stirring shaft 200 is rotatably connected inside the mixing cylinder 100. The driving assembly 300 drives the stirring shaft 200 to rotate. The outer wall of the stirring shaft 200 is provided with multiple mounting grooves 211. A stirring rod 201 is rotatably connected to the top of the inner side of each mounting groove 211. In this embodiment, the material is added into the interior of the mixing cylinder 100, and the driving assembly 300 drives the stirring shaft 200 and the stirring rod 201 to rotate. When rotating, each stirring rod 201 opens outward by centrifugal force, thereby fully mixing the material. The mixed material is discharged outward through the discharge port 103.

[0026] During the mixing process, the outward opening of the stirring rod 201 allows material to enter the mounting groove 211. After mixing, this material remains inside the mounting groove 211, potentially causing material waste and preventing the stirring rod 201 from returning to its original position. To avoid this, a specific structure can be adopted as follows: Figure 2 , Figure 5 as well as Figure 7 In the embodiment shown, each mounting groove 211 has sliding grooves 212 on both sides inside. A sealing plate 202 is slidably connected inside the sliding groove 212. An expansion airbag 203 is detachably connected to the side of the sealing plate 202 away from the stirring rod 201. The other side of the expansion airbag 203 is fixed to the inner wall of the mounting groove 211. The stirring shaft 200 has a mounting chamber 216 inside. A control component is installed at the bottom of the stirring shaft 200. The control component is connected to each expansion airbag 203 through the mounting chamber 216. The control component controls each expansion airbag 203 to expand or contract simultaneously. In this embodiment, when the stirring rod 201 opens outward during the stirring process, the control component causes each expansion airbag 203 to expand, pushing each sealing plate 202 to move outward along the path of the sliding groove 212, thereby sealing the mounting groove 211 and preventing material from entering during the stirring process, thus avoiding material waste and reducing the difficulty of cleaning.

[0027] To achieve the inflation of each inflatable airbag 203, the specific structure of the control component can be as follows: Figure 3 , Figure 4 , Figure 7 as well as Figure 9 In the embodiment shown, the control assembly includes a first air inlet pipe 204, a rotating component 206, a first rotating ring 209, and a connecting pipe 214. The rotating component 206 is rotatably connected to the bottom of the stirring shaft 200, and is detachably connected to the bottom of the mixing cylinder 100. Each expansion air bladder 203 is detachably connected to a first air inlet pipe 204. The first rotating ring 209 is rotatably connected to the upper end of the rotating component 206. A first chamber 207 is provided inside the rotating component 206, and the first air inlet pipe 204 communicates with the first chamber 207. The bottom of 206 is connected to two connecting pipes 214 that communicate with the inside of the first chamber 207. One connecting pipe 214 is connected to an external air compressor, and the other connecting pipe 214 is connected to an external air pump. In this embodiment, the setting of the first rotating ring 209 ensures that the stirring shaft 200 does not affect the connection of the first air inlet pipe 204 when it rotates. The air compressor pressurizes the inside of the first chamber 207, and then the first air inlet pipe 204 causes each expansion bladder 203 to expand. When the stirring ends, the air pump is used to extract air, causing each expansion bladder 203 to contract.

[0028] To avoid the speed dependence and uncontrollable angle problems that arise when the stirring rod 201 relies solely on centrifugal force for expansion, and to ensure a closer coordination between the expansion of the expansion bladder 203 and the movement of the stirring rod 201, a specific structure can be adopted as follows: Figure 8 In the embodiment shown, each stirring rod 201 is fixedly connected to the sealing plate 202 by a connecting rope 215. In this embodiment, the connecting rope 215 allows the inflatable airbag 203 to expand and push the stirring rod 201 outward, and the connecting rope 215 pulls the stirring rod 201 back to its original position after the inflatable airbag 203 contracts. This further reduces the amount of material entering the installation groove 211 and reduces the difficulty of cleaning.

[0029] During mixing, the outer wall of the sealing plate 202 is easily contaminated with material, and material also remains on the opposing surfaces of the mixing rod 201 and the sealing plate 202. Even after shrinkage, these residues are difficult to clean. To effectively clean the outer wall of the sealing plate 202 and the opposing surfaces of the mixing rod 201 and the sealing plate 202, a specific structure can be adopted as follows: Figure 6 as well as Figure 8In the embodiment shown, each mounting groove 211 has multiple one-way valves 213 on the inner wall near the opening. A second rotating ring 210 is rotatably connected to the upper center of the rotating component 206. A second chamber 208 is located at the center of the rotating component 206. Multiple second air inlet pipes 205 are detachably connected to the upper end of the second rotating ring 210. The second air inlet pipes 205 are connected to the stirring shaft 200 and communicate with the one-way valves 213. A connecting pipe 214 communicating with the interior of the second chamber 208 is fixedly connected to the bottom of the rotating component 206. The connecting pipe 214 is connected to an external nitrogen source device. A gas preheater is installed in the pipeline connected to the connecting pipe 214. In this embodiment, the interior of the second chamber 208 is pressurized by a nitrogen gas source device. The gas is then sprayed out through the second air inlet pipe 205 towards the opposite surfaces of the sealing plate 202 and the stirring rod 201 via the one-way valve 213. This allows the gap and opposite surfaces between the sealing plate 202 and the stirring rod 201 to be cleaned when the expansion bladder 203 contracts and the stirring rod 201 resets after stirring. It also prevents the magnetic powder from oxidizing. The nitrogen gas is heated by the gas preheater to prevent the adhesive viscosity from increasing and to control the spray pressure to ≤0.04MPa.

[0030] When discharging material after mixing, the outer wall of the mixing shaft 200 will inevitably be contaminated with material. To further reduce material loss and clean the outer wall of the mixing shaft 200, a specific structure can be adopted as follows: Figure 3 as well as Figure 10In the embodiment shown, a cleaning component 400 is provided on the outer wall of the stirring shaft 200. The cleaning component 400 moves up and down along the outer wall of the stirring shaft 200 to clean the outer wall of the stirring shaft 200. The cleaning component 400 includes a cleaning ring 401, a second jet nozzle 402, a traction rope 403, a take-up roller 404, a mounting bracket 405, a second servo motor 406, and a connecting air pipe 407. The cleaning ring 401 is sleeved on the outer wall of the stirring shaft 200. A chamfer is provided on the inner outer edge of the bottom of the cleaning ring 401, and multiple second jet nozzles 402 inclined downward toward the outer wall of the stirring shaft 200 are provided on the chamfer. The mounting bracket 405 is detachably connected to the upper two sides of the mixing cylinder 100. The take-up roller 404 is rotatably connected to the mounting brackets 405 on both sides. The second servo motor 406 is detachably connected to the outer wall of one side of the mounting bracket 405. The rotating end of the second servo motor 406 is drivenly connected to one end of the take-up roller 404. The connecting air pipe 407... One end of the 7 is detachably connected to the upper end of the cleaning ring 401 and communicates with each second jet port 402. The other end of the connecting air pipe 407 is connected to a nitrogen gas source device. The connecting air pipe 407 is installed on the upper end of the mixing cylinder 100 through a winding reel with a spring reset mechanism. When the cleaning ring 401 descends, the winding reel rotates against the spring force, causing the connecting air pipe 407 to extend. When the cleaning ring 401 rises, the winding reel automatically retracts the connecting air pipe 407 under the action of the spring. One end of the traction rope 403 is detachably connected to the upper end of the cleaning ring 401. The other end of the traction rope 403 is wound around the winding roller 404. In this embodiment, when discharging material after mixing, the second servo motor 406 rotates to lengthen the traction rope 403, causing the cleaning ring 401 to move downward along the outer wall of the mixing shaft 200. Then, nitrogen gas is sprayed out through the second jet port 402, which can clean the outer wall of the mixing shaft 200 and the outer wall of the mixing rod 201, and also assist in discharging material.

[0031] The specific structure of the driver component 300 can be as follows: Figure 5 In the embodiment shown, the drive assembly 300 includes a first servo motor 301, a first bevel gear 302, and a second bevel gear 303. The upper end of the stirring shaft 200 extends out of the mixing cylinder 100 and is fixedly connected to the second bevel gear 303. The first bevel gear 302 meshes with the second bevel gear 303. The first servo motor 301 is detachably connected to the upper end of the mixing cylinder 100. The rotating end of the first servo motor 301 is connected to the first bevel gear 302 for transmission. In this embodiment, the first bevel gear 302 is driven to rotate by the rotation of the first servo motor 301, and the second bevel gear 303 is driven to rotate by meshing, thereby causing the stirring shaft 200 to rotate and achieving the stirring of materials.

[0032] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A high-energy-product neodymium iron boron magnet preparation apparatus, comprising a mixing cylinder (100), wherein a plurality of support legs (101) are fixedly connected to the bottom of the mixing cylinder (100), a discharge port (103) is provided at the bottom of the mixing cylinder (100), and a feed port (102) is provided at the upper end of the mixing cylinder (100), characterized in that, A drive assembly (300) is provided at the upper end of the mixing cylinder (100). A stirring shaft (200) is rotatably connected inside the mixing cylinder (100). The drive assembly (300) drives the stirring shaft (200) to rotate. Multiple mounting grooves (211) are provided on the outer wall of the stirring shaft (200). A stirring rod (201) is rotatably connected to the top of the inner side of each mounting groove (211). Sliding grooves (212) are provided on both sides inside each mounting groove (211). A sealing plate (202) is slidably connected inside the sliding groove (212). The side of the sealing plate (202) away from the stirring rod (201) is detachable. An expansion airbag (203) is connected to the unloading device. The other side of the expansion airbag (203) is fixed to the inner wall of the mounting groove (211). The stirring shaft (200) has an mounting chamber (216) inside. A control component is installed at the bottom of the stirring shaft (200). The control component is connected to each expansion airbag (203) through the mounting chamber (216). The control component controls each expansion airbag (203) to expand or contract simultaneously. The control component causes each expansion airbag (203) to expand, pushing each sealing plate (202) to move outward along the path of the sliding groove (212) to seal the mounting groove (211).

2. The apparatus for preparing high-energy-product NdFeB magnets according to claim 1, characterized in that, A cleaning component (400) is provided on the outer wall of the stirring shaft (200). The cleaning component (400) moves up and down along the outer wall of the stirring shaft (200) to clean the outer wall of the stirring shaft (200).

3. The apparatus for preparing high energy product NdFeB magnets according to claim 1, characterized in that, The control assembly includes a first air inlet pipe (204), a rotating component (206), a first rotating ring (209), and a connecting pipe (214). The rotating component (206) is rotatably connected to the bottom of the stirring shaft (200), and the rotating component (206) is detachably connected to the bottom of the mixing cylinder (100). Each expansion air bladder (203) is detachably connected to a first air inlet pipe (204). The first rotating ring (209) is rotatably connected to the upper end of the rotating component (206). The rotating component (206) has a first chamber (207) inside. The first air inlet pipe (204) is connected to the first chamber (207). The bottom of the rotating component (206) is connected to two connecting pipes (214) that are connected to the inside of the first chamber (207). One connecting pipe (214) is connected to an external air compressor, and the other connecting pipe (214) is connected to an external air pump.

4. The apparatus for preparing high-energy-product NdFeB magnets according to claim 1, characterized in that, Each stirring rod (201) is fixedly connected to the sealing plate (202) by a connecting rope (215). After the inflatable airbag (203) contracts, it works with the connecting rope (215) to pull the stirring rod (201) back to its original position.

5. The apparatus for preparing high-energy-product NdFeB magnets according to claim 1, characterized in that, Each mounting groove (211) has multiple one-way valves (213) on the inner wall near the opening. A second rotating ring (210) is rotatably connected to the upper center of the rotating part (206). A second chamber (208) is provided at the center of the rotating part (206). Multiple second air inlet pipes (205) are detachably connected to the upper end of the second rotating ring (210). The second air inlet pipes (205) are connected to the stirring shaft (200) and communicate with the one-way valves (213). A connecting pipe (214) communicating with the inside of the second chamber (208) is fixedly connected to the bottom of the rotating part (206).

6. The apparatus for preparing high energy product NdFeB magnets according to claim 5, characterized in that, The connecting pipe (214) is connected to an external nitrogen gas source device, and a gas preheater is installed in the pipeline connecting the nitrogen gas source device and the connecting pipe (214).

7. The apparatus for preparing high energy product NdFeB magnets according to claim 2, characterized in that, The cleaning assembly (400) includes a cleaning ring (401), second jet nozzles (402), and connecting air pipes (407). The cleaning ring (401) is fitted onto the outer wall of the stirring shaft (200). A chamfer is provided at the inner outer edge of the bottom of the cleaning ring (401), and multiple second jet nozzles (402) are provided on the chamfer, tilted downward toward the outer wall of the stirring shaft (200). One end of the connecting air pipe (407) is detachably connected to the upper end of the cleaning ring (401) and communicates with each second jet nozzle (402). 7) The other end is connected to a nitrogen gas source device. The connecting pipe (407) is installed on the upper end of the mixing cylinder (100) through a winding reel with a spring reset mechanism. When the cleaning ring (401) descends, the winding reel rotates against the spring force, causing the connecting pipe (407) to extend. When the cleaning ring (401) rises, the winding reel automatically retracts the connecting pipe (407) under the action of the spring. A lifting component is installed on the upper end of the mixing cylinder (100). The lifting component causes the cleaning ring (401) to move up and down along the outer wall of the stirring shaft (200).

8. The apparatus for preparing high energy product NdFeB magnets according to claim 7, characterized in that, The lifting assembly includes a traction rope (403), a take-up roller (404), a mounting bracket (405), and a second servo motor (406). The mounting bracket (405) is detachably connected to both sides of the upper end of the mixing cylinder (100). The take-up roller (404) is rotatably connected to the mounting brackets (405) on both sides. The second servo motor (406) is detachably connected to the outer wall of one side of the mounting bracket (405). The rotating end of the second servo motor (406) is connected to one end of the take-up roller (404). One end of the traction rope (403) is detachably connected to the upper end of the cleaning ring (401). The other end of the traction rope (403) is wound around the take-up roller (404). The second servo motor (406) rotates to lengthen the traction rope (403), causing the cleaning ring (401) to move downward along the outer wall of the stirring shaft (200).

9. The apparatus for preparing high-energy-product NdFeB magnets according to claim 1, characterized in that, The drive assembly (300) includes a first servo motor (301), a first bevel gear (302), and a second bevel gear (303). The upper end of the stirring shaft (200) extends out of the mixing cylinder (100) and is fixedly connected to the second bevel gear (303). The first bevel gear (302) meshes with the second bevel gear (303). The first servo motor (301) is detachably connected to the upper end of the mixing cylinder (100). The rotating end of the first servo motor (301) is connected to the first bevel gear (302) for transmission. The rotation of the first servo motor (301) drives the first bevel gear (302) to rotate, and through meshing, drives the second bevel gear (303) to rotate, thereby causing the stirring shaft (200) to rotate.

10. The apparatus for preparing high energy product NdFeB magnets according to claim 1, characterized in that, An ultrasonic generator is provided on one side of the mixing cylinder (100).

Images