Neodymium iron boron waste mixing and stirring device and control method thereof

Abstract

This invention discloses a NdFeB waste mixing and stirring device and its control method, specifically relating to the field of NdFeB waste processing technology. The device includes a support platform, a stirring drum, a heat-conducting component, a stirring assembly, and a feeding assembly. The heat-conducting component includes an air cylinder disposed at the top of the stirring drum, with a heat-conducting element inside. The stirring assembly includes a rotating drum disposed inside the stirring drum, with a guide groove on its inner wall. The guide groove and a guide column cooperate, allowing the guide column to slide within the guide groove and drive the rotating drum to rotate. This invention mixes and stirs the NdFeB waste by pumping nitrogen into the air cylinder, causing a piston plate to slide inside the air cylinder, thereby driving the rotating drum to rotate. This avoids the problem of reduced oxygen levels inside the stirring drum due to insufficient sealing at the connection shaft between the motor and the spiral stirring blades.

Description

Technical Field

[0001] This invention relates to the field of neodymium iron boron waste processing technology, and more specifically, to a neodymium iron boron waste mixing and stirring device and its control method. Background Technology

[0002] Neodymium iron boron (NdFeB) waste comprises machining debris, scraps, sludge, and residual raw materials generated during the production and processing of NdFeB permanent magnet materials, accounting for 20% to 50% of the NdFeB raw material. This waste contains 20% to 30% rare earth elements, representing a valuable secondary resource. Recycling it is beneficial for environmental protection and the sustainable development of the rare earth industry. The NdFeB waste recycling process typically involves grinding the waste into powder, adding reagents, and mixing.

[0003] However, since NdFeB powder reacts readily with oxygen, higher requirements are placed on the oxygen-free purity of the stirring environment, and nitrogen is usually used to protect the NdFeB powder.

[0004] Chinese Patent Application No. 202321831234.1 discloses a neodymium iron boron powder mixing machine, including a mixing drum with spiral stirring blades inside. A stirring motor connected to the spiral stirring blades is located at the top of the mixing drum, and a feed inlet is provided on the mixing drum. A circulating fan is connected to the mixing drum through an air inlet pipe and an air outlet pipe. A refrigerated dryer is connected to the air inlet pipe and located between the circulating fan and the mixing drum. A split booster air pump is connected to the air inlet pipe and located between the refrigerated dryer and the mixing drum. A split air inlet pipe has multiple nozzles connected to the split booster air pump. Multiple air nozzles are provided on the side wall of the mixing drum, and the other end of the split air inlet pipe is connected to the air nozzles. While this patent can effectively improve mixing efficiency and reduce the temperature during mixing, if the connection shaft between the motor and the spiral mixing blades is not sealed tightly enough, external air will enter the mixing drum, reducing the oxygen-free level inside the drum. Additionally, when NdFeB waste is fed into the inlet, external air will also enter the mixing drum, further reducing the oxygen-free level. Moreover, the nitrogen circulation process, which lowers the temperature inside the mixing drum, can cause powder to clog the nitrogen pipes and also carry away some NdFeB powder during the circulation process, resulting in the loss of NdFeB powder after mixing.

[0005] This invention proposes a mixing and stirring device for NdFeB waste and its control method to solve the above problems. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a neodymium iron boron waste mixing and stirring device and its control method to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a neodymium iron boron waste mixing and stirring device, comprising: a support platform, a stirring drum, a heat-conducting component, a stirring assembly, and a feeding assembly. A cooling box is provided on the support platform, and nitrogen gas is disposed inside the cooling box. The heat-conducting component includes a gas cylinder disposed at the top of the stirring drum, and a heat-conducting element is disposed inside the gas cylinder. One end of the heat-conducting element is provided with a guide column. The stirring assembly includes a rotating drum disposed inside the stirring drum. A guide groove is formed on the inner wall of the rotating drum, and blades are disposed on the outer wall of the rotating drum. The guide groove and the guide column cooperate, and the guide column can slide inside the guide groove to drive the rotating drum to rotate. The feeding assembly includes a feeding cylinder disposed at the top of the stirring drum, and a tray is disposed inside the feeding cylinder. A sealing element is disposed between the tray and the inner top wall of the feeding cylinder, and the sealing element, the tray, and the inner top wall of the feeding cylinder form a feeding chamber.

[0008] Preferably, a piston plate is slidably connected inside the air cylinder, and the piston plate is fixedly connected to the end of the heat-conducting component away from the guide column, while the end of the heat-conducting component near the guide column extends through the air cylinder and into the interior of the rotating drum.

[0009] Preferably, one end of the air cylinder has a first through hole, which is connected to the cooling box via a pipe, and the other end of the air cylinder away from the first through hole has a second through hole, which is connected to the cooling box via a pipe.

[0010] Preferably, an air pump is provided between the first through hole and the cooling box, and the air pump is capable of bidirectional operation.

[0011] Preferably, the feed cylinder has a groove inside, the tray is slidably connected to the groove, the groove has an elastic element inside, one end of the elastic element is fixedly connected to the bottom wall of the groove, and the other end of the elastic element is fixedly connected to the tray.

[0012] Preferably, a first feed hole is provided at one end of the feed cylinder, and a second feed hole is provided inside the tray. A valve is provided at both the first feed hole and the second feed hole.

[0013] Preferably, a pressure sensor is provided at the first through hole of the air cylinder, and pressure sensors are provided at both the first feed hole and the second feed hole.

[0014] Preferably, the bottom of the stirring drum is provided with a discharge hole and a valve is provided at the discharge hole. A finished product tank is provided on the support platform. One end of the finished product tank is connected to the stirring drum through the discharge hole. A reagent box is provided on the top of the stirring drum. A third through hole is provided at the bottom of the reagent box and a valve is provided at the third through hole.

[0015] Preferably, the stirring tank is remotely connected to a controller, which is electrically connected to various pressure sensors and valves, and electrically connected to the air pump.

[0016] A control method for a neodymium iron boron waste mixing and stirring device is also provided, comprising the following steps:

[0017] S1. In the initial state, the valve at the first feed port is closed, and the valve at the second feed port is open;

[0018] S2. Load the NdFeB waste powder into the feed cylinder. When the pressure at the first feed hole is greater than the maximum threshold of the sensor, feed begins and the valve at the first feed hole opens; the valve at the second feed hole closes.

[0019] S3. When the pressure at the second feed port exceeds the maximum threshold of the sensor, the controller controls the valve at the second feed port to open and the valve at the first feed port to close.

[0020] S4. When the pressure at the second feed port is less than the sensor's minimum threshold, the controller controls the valve at the second feed port to close and the valve at the first feed port to open.

[0021] S5. When the pressure at the first feed hole is less than the sensor's minimum threshold, the feeding is complete, the valve at the first feed hole is closed, and the valve at the second feed hole is opened.

[0022] S6. Start the air pump to rotate forward via the controller. The air pump draws nitrogen from the cooling box into the air cylinder.

[0023] S7. When the pressure inside the air cylinder is greater than the maximum threshold of the sensor at the first through hole, the controller causes the air pump to reverse, and the air pump draws nitrogen from the air cylinder to the cooling box.

[0024] S8. When the pressure inside the air cylinder is less than the minimum threshold of the sensor at the first through hole, the controller causes the air pump to rotate in the forward direction, and the air pump re-draws nitrogen from the cooling box into the air cylinder.

[0025] S9. After S7 and S8 are completed, the air pump is turned off and the valve at the discharge port is opened by the controller, and the NdFeB waste enters the finished product tank.

[0026] The technical effects and advantages of this invention are as follows:

[0027] 1. This invention uses nitrogen gas to pump into a gas cylinder, causing a piston plate to slide inside the cylinder. This, in turn, causes a guide column to move inside a guide groove, which in turn causes a rotating drum to rotate and mix NdFeB waste. This avoids the problem that insufficient sealing at the connection shaft between the motor and the spiral mixing blades can allow external air to enter the mixing drum, thus reducing the oxygen-free level inside the mixing drum.

[0028] 2. This invention uses a heat-conducting component that slides inside the rotating drum to cool it down, thereby maintaining a suitable temperature for the NdFeB waste during the mixing process. This prevents the temperature of the NdFeB waste from gradually increasing with stirring, which would lead to increased activity and greater susceptibility to oxidation.

[0029] 3. This invention prevents NdFeB powder from directly contacting the nitrogen during nitrogen circulation, thus preventing the NdFeB powder from clogging the nitrogen pipeline and reducing powder loss due to gas flow.

[0030] 4. The present invention uses valves at the first and second feed holes to cooperate with each other, and the volume of the feed chamber changes with the feeding process of NdFeB waste, thereby preventing air from entering the mixing tank during feeding and causing a decrease in the oxygen purity inside the mixing tank. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 This is a cross-sectional view of the stirring tank of the present invention.

[0033] Figure 3 This is a cross-sectional view of the stirring assembly structure of the present invention.

[0034] Figure 4 This is a schematic diagram of the thermal conductive component structure of the present invention.

[0035] Figure 5 For the present invention Figure 2 Enlarged view of the structure of part A.

[0036] The attached figures are labeled as follows: 1. Support platform; 11. Cooling box; 12. Air pump; 13. Finished product tank; 2. Stirring drum; 21. Discharge port; 22. Reagent box; 23. Third through hole; 3. Heat-conducting component; 31. Air cylinder; 311. Piston plate; 32. Heat-conducting component; 33. Guide column; 34. First through hole; 35. Second through hole; 4. Stirring component; 41. Rotary drum; 42. Guide groove; 5. Feeding component; 51. Feeding cylinder; 52. Tray; 53. Sealing component; 54. Slide groove; 55. Elastic component; 56. First feed hole; 57. Second feed hole. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] In actual production, if the connection shaft between the motor and the spiral stirring blades is not sealed tightly enough, external air will enter the stirring drum 2, resulting in a decrease in the oxygen-free level inside the stirring drum 2. This embodiment is invented to solve the above problem.

[0040] Please see Figures 1 to 5 As shown, an embodiment of the present invention provides a neodymium iron boron waste mixing and stirring device, including a support platform 1, a stirring drum 2, a heat-conducting component 3, a stirring component 4, and a feeding component 5. A cooling box 11 is mounted on the support platform 1, and nitrogen gas is disposed inside the cooling box 11. The heat-conducting component 3 includes an air cylinder 31 disposed at the top of the stirring drum 2, and a heat-conducting element 32 is disposed inside the air cylinder 31. A guide column 33 is disposed at one end of the heat-conducting element 32. The stirring component 4 includes a rotating drum 41 disposed inside the stirring drum 2, and the inner wall of the rotating drum 41 has an opening... The drum 41 has a guide groove 42 and blades on its outer wall. The guide groove 42 and the guide column 33 cooperate with each other, and the guide column 33 can slide inside the guide groove 42 to drive the drum 41 to rotate. The feeding assembly 5 includes a feeding cylinder 51 set at the top of the mixing drum 2. A tray 52 is set inside the feeding cylinder 51. A sealing element 53 is set between the tray 52 and the inner top wall of the feeding cylinder 51. The sealing element 53, the tray 52 and the inner top wall of the feeding cylinder 51 form a feeding chamber. The sealing element 53 is made of a flexible material that can be deformed.

[0041] Please see Figure 2 and Figure 5 As shown, a piston plate 311 is slidably connected inside the air cylinder 31. The piston plate 311 is fixedly connected to the end of the heat-conducting component 32 away from the guide post 33. The end of the heat-conducting component 32 near the guide post 33 extends through the air cylinder 31 and into the interior of the rotating drum 41.

[0042] Please see Figure 2 As shown, one end of the air cylinder 31 has a first through hole 34, which is connected to the cooling box 11 through a pipe. The other end of the air cylinder 31 away from the first through hole 34 has a second through hole 35, which is connected to the cooling box 11 through a pipe. An air pump 12 is provided between the first through hole 34 and the cooling box 11. The air pump 12 can work in both directions.

[0043] Please see Figure 2 and Figure 5As shown, a chute 54 is provided inside the feed cylinder 51, and the tray 52 is slidably connected to the chute 54. An elastic element 55 is provided inside the chute 54. One end of the elastic element 55 is fixedly connected to the bottom wall of the chute 54, and the other end of the elastic element 55 is fixedly connected to the tray 52. ​​A first feed hole 56 is provided at one end of the feed cylinder 51, and a second feed hole 57 is provided inside the tray 52. ​​Valves are provided at both the first feed hole 56 and the second feed hole 57. A pressure sensor is provided at the first through hole 34 of the air cylinder 31, and pressure sensors are provided at both the first feed hole 56 and the second feed hole 57.

[0044] Please see Figure 1 and Figure 2 As shown, the bottom of the stirring drum 2 is provided with a discharge hole 21, and a valve is provided at the discharge hole 21. The support platform 1 is provided with a finished product tank 13. One end of the finished product tank 13 is connected to the stirring drum 2 through the discharge hole 21. The top of the stirring drum 2 is provided with a reagent box 22. The bottom of the reagent box 22 is provided with a third through hole 23, and a valve is provided at the third through hole 23. The stirring drum 2 is remotely connected to a controller. The controller is electrically connected to each pressure sensor and valve, and the controller is electrically connected to the air pump 12.

[0045] During use, the air inside the mixing drum 2 is emptied and nitrogen is introduced. After the NdFeB waste is loaded into the mixing drum 2, the air pump 12 is started by the controller, causing the air pump 12 to rotate forward. The air pump 12 draws the nitrogen from the cooling box 11 through the pipe and the first through hole 34 to the top of the air cylinder 31, thereby increasing the pressure inside the air cylinder 31. This causes the piston plate 311 to slide downward in the air cylinder 31, so that the gas at the bottom of the air cylinder 31 is squeezed by the piston plate 311 and enters the cooling box 11 through the second through hole 35 and the pipe. The downward sliding of the piston plate 311 drives the heat-conducting component 32 to slide inside the rotating drum 41, thereby causing the guide column 33 to slide in the guide groove 42. This causes the rotating drum 41 to rotate and mix the NdFeB waste. When the piston plate 311 slides to the bottom of the air cylinder 31, gas continues to enter the air cylinder 31, causing the pressure at the top of the air cylinder 31 to gradually increase. As the pressure gradually increases, when the pressure inside the cylinder 31 exceeds the maximum threshold of the sensor at the first through-hole 34, the controller controls the air pump 12 to reverse, thereby drawing the gas inside the cylinder 31 out of the cylinder 31 and into the cooling box 11. This causes the piston plate 311 to move upward inside the cylinder 31, thus causing the rotating drum 41 to reverse. When the pressure at the first through-hole 34 is less than the minimum threshold of the pressure sensor, the air pump 12 rotates forward to pump nitrogen back to the top of the cylinder 31. By pumping nitrogen into the cylinder 31, the piston plate 311 slides inside the cylinder 31, thereby causing the guide column 33 to move inside the guide groove 42. This causes the rotating drum 41 to rotate and mix the NdFeB waste. This avoids the problem that external air may enter the mixing drum 2 due to insufficient sealing at the connection shaft between the motor and the spiral mixing blades, which would reduce the oxygen-free level inside the mixing drum 2.

[0046] Example 2

[0047] In practical use, it was found that during the mixing process, the temperature of the NdFeB waste gradually increased with stirring, and the increased activity of the NdFeB waste made it more prone to oxidation. Further improvements were made based on the above embodiments.

[0048] Based on the above embodiments, in use, after the nitrogen gas inside the cooling box 11 is cooled, the gas is then pumped into the gas cylinder 31 by the gas pump 12. This causes the piston plate 311 to slide downwards inside the gas cylinder 31, squeezing the gas at the bottom of the gas cylinder 31 back into the cooling box 11 for cooling. As the cooled nitrogen gas continuously enters the gas cylinder 31, it cools the heat-conducting component 32. At the same time, the heat-conducting component 32 slides inside the rotating cylinder 41, cooling the rotating cylinder 41. When the piston plate 311 slides upwards inside the gas cylinder 31, the cooled gas re-enters the bottom of the gas cylinder 31 from the cooling box 11, further cooling the heat-conducting component 32. The gas continuously enters the cylinder 31 to cool the heat-conducting component 32. At the same time, the heat-conducting component 32 slides inside the rotating cylinder 41 to cool the rotating cylinder 41. This ensures that the NdFeB waste maintains a suitable temperature during the mixing process, preventing the temperature of the NdFeB waste from gradually increasing with stirring, which would lead to increased activity and easier oxidation. In addition, during the nitrogen circulation process, the nitrogen does not come into direct contact with the NdFeB powder, preventing the NdFeB powder from clogging the nitrogen pipeline. The nitrogen circulation process also carries away some NdFeB powder, causing a loss of the mixed NdFeB powder.

[0049] Example 3

[0050] In actual use, it was found that when neodymium iron boron waste is added into the mixing drum 2, air can easily enter the mixing drum 2 through the feed port, which leads to a decrease in the oxygen purity inside the mixing drum 2. Further improvements have been made based on the above embodiments.

[0051] In operation, initially, the valve at the first feed port 56 is closed, and the valve at the second feed port 57 is open. When NdFeB scrap is fed, it is loaded into the feed cylinder 51. As the NdFeB scrap continuously enters the feed cylinder 51, the pressure at the first feed port 56 continuously increases. When the pressure sensor at the first feed port 56 reaches its maximum threshold, the controller controls the valve at the second feed port 57 to close and the valve at the first feed port 56 to open, allowing the NdFeB scrap to enter the feed chamber through the first feed port 56. As the feed material enters the feeding chamber, the pressure on tray 52 continuously increases, causing it to slide downwards within the chute 54. This compresses the elastic element 55, while simultaneously increasing the pressure at the second feed hole 57. When the pressure at the second feed hole 57 exceeds the sensor's maximum threshold, the valve at the second feed hole 57 opens, and the valve at the first feed hole 56 closes. At this point, the NdFeB waste enters the mixing drum 2 through the second feed hole 57. As the NdFeB waste gradually enters the mixing drum 2, the pressure on tray 52 continuously decreases, thus compressing the elastic element 55. As component 55 expands, tray 52 slides upwards. Simultaneously, the pressure at the second feed hole 57 gradually decreases. When the pressure at the second feed hole 57 is less than the sensor's minimum threshold, the valve at the second feed hole 57 closes, and the valve at the first feed hole 56 opens, allowing NdFeB waste to re-enter the feed chamber. As the NdFeB waste continuously passes through the feed chamber into the mixing drum 2, the amount of NdFeB waste at the first feed hole 56 gradually decreases. Simultaneously, the pressure at the first feed hole 56 continuously decreases. When the pressure at the first feed hole 56 is less than the sensor's minimum threshold, the valve at the first feed hole 56... The valve is closed, and the valve at the second feed hole 57 is opened, completing the feeding process. The volume of the feed chamber is changed by the movement of the tray 52 inside the chute 54. This allows the volume of the feed chamber to increase as the amount of NdFeB waste increases, and decrease as the NdFeB waste enters the mixing drum 2. The valves at the first feed hole 56 and the second feed hole 57 work together, and the volume of the feed chamber changes with the feeding process of the NdFeB waste. This prevents air from entering the mixing drum 2 from the feed cylinder 51 during feeding, which would reduce the oxygen purity inside the mixing drum 2.

[0052] Example 4

[0053] Based on the above embodiments, this embodiment also provides a control method for a neodymium iron boron waste mixing and stirring device, including the following specific steps:

[0054] S1. In the initial state, the valve at the first feed hole 56 is closed, and the valve at the second feed hole 57 is open;

[0055] S2. Load the NdFeB waste powder into the feed cylinder 51. When the pressure at the first feed hole 56 is greater than the maximum threshold of the sensor, feed begins and the valve at the first feed hole 56 is opened; the valve at the second feed hole 57 is closed.

[0056] S3. When the pressure at the second feed hole 57 is greater than the maximum threshold of the sensor, the controller controls the valve at the second feed hole 57 to open and the valve at the first feed hole 56 to close.

[0057] S4. When the pressure at the second feed hole 57 is less than the sensor's minimum threshold, the controller controls the valve at the second feed hole 57 to close and the valve at the first feed hole 56 to open.

[0058] S5. When the pressure at the first feed hole 56 is less than the sensor's minimum threshold, the feeding is complete, the valve at the first feed hole 56 is closed, and the valve at the second feed hole 57 is opened.

[0059] S6. Start the air pump 12 to rotate forward via the controller. The air pump 12 draws nitrogen from the cooling box 11 into the air cylinder 31.

[0060] S7. When the internal pressure of the air cylinder 31 is greater than the maximum threshold of the sensor, the controller causes the air pump 12 to reverse, and the air pump 12 draws nitrogen from the air cylinder 31 to the cooling box 11.

[0061] S8. When the pressure inside the air cylinder 31 is less than the minimum threshold of the sensor, the controller causes the air pump 12 to rotate in the forward direction, and the air pump 12 re-draws nitrogen from the cooling box 11 into the air cylinder 31.

[0062] S9. After S7 and S8 are completed, the air pump 12 is turned off by the controller and the valve at the discharge port 21 is opened, and the NdFeB waste enters the finished product tank 13.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A neodymium iron boron waste mixing and stirring device, comprising a support platform (1) and a stirring cylinder (2), wherein a cooling box (11) is provided on the support platform (1), and nitrogen gas is provided inside the cooling box (11), characterized in that, Also includes: The heat-conducting component (3) includes an air cylinder (31) disposed at the top of the stirring drum (2), a heat-conducting component (32) is disposed inside the air cylinder (31), and a guide column (33) is disposed at one end of the heat-conducting component (32). The stirring assembly (4) includes a rotating drum (41) disposed inside the stirring drum (2), the inner wall of the rotating drum (41) is provided with a guide groove (42), and the outer wall of the rotating drum (41) is provided with blades. The guide groove (42) and the guide post (33) cooperate with each other, and the guide post (33) can slide inside the guide groove (42) to drive the rotating cylinder (41) to rotate; The feeding assembly (5) includes a feeding cylinder (51) disposed at the top of the mixing cylinder (2), a tray (52) is disposed inside the feeding cylinder (51), and a sealing element (53) is disposed between the tray (52) and the inner top wall of the feeding cylinder (51). The sealing element (53), the tray (52) and the inner top wall of the feeding cylinder (51) form a feeding chamber. One end of the air cylinder (31) is provided with a first through hole (34), which is connected to the cooling box (11) through a pipe. The other end of the air cylinder (31) away from the first through hole (34) is provided with a second through hole (35), which is connected to the cooling box (11) through a pipe. The cylinder (31) is slidably connected to a piston plate (311). The piston plate (311) is fixedly connected to the end of the heat-conducting component (32) away from the guide post (33). The end of the heat-conducting component (32) near the guide post (33) extends through the cylinder (31) and into the interior of the rotating cylinder (41).

2. The NdFeB waste mixing and stirring device according to claim 1, characterized in that: An air pump (12) is provided between the first through hole (34) and the cooling box (11), and the air pump (12) can work in both directions.

3. The neodymium iron boron waste mixing and stirring device according to claim 2, characterized in that: The feed cylinder (51) has a groove (54) inside. The tray (52) is slidably connected to the groove (54). An elastic element (55) is provided inside the groove (54). One end of the elastic element (55) is fixedly connected to the bottom wall of the groove (54), and the other end of the elastic element (55) is fixedly connected to the tray (52).

4. The neodymium iron boron waste mixing and stirring device according to claim 3, characterized in that: The feed cylinder (51) has a first feed hole (56) at one end, and the tray (52) has a second feed hole (57). Valves are provided at both the first feed hole (56) and the second feed hole (57).

5. The NdFeB waste mixing and stirring device according to claim 4, characterized in that: A pressure sensor is provided at the first through hole (34) of the air cylinder (31), and pressure sensors are provided at both the first feed hole (56) and the second feed hole (57).

6. The NdFeB waste mixing and stirring device according to claim 5, characterized in that: The bottom of the stirring drum (2) is provided with a discharge hole (21), and a valve is provided at the discharge hole (21). A finished product tank (13) is provided on the support platform (1). One end of the finished product tank (13) is connected to the stirring drum (2) through the discharge hole (21). A reagent box (22) is provided at the top of the stirring drum (2). A third through hole (23) is provided at the bottom of the reagent box (22), and a valve is provided at the third through hole (23).

7. The NdFeB waste mixing and stirring device according to claim 6, characterized in that: The stirring tank (2) is remotely connected to a controller, which is electrically connected to various pressure sensors and valves, and electrically connected to the air pump (12).

8. A control method for a neodymium iron boron waste mixing and stirring device, used to control the neodymium iron boron waste mixing and stirring device as described in claim 7, characterized in that, Includes the following steps: S1. In the initial state, the valve at the first feed hole (56) is closed, and the valve at the second feed hole (57) is open; S2. Load the NdFeB waste powder into the feed cylinder (51). When the pressure at the first feed hole (56) is greater than the maximum threshold of the sensor, feed begins. The valve at the first feed hole (56) is opened; the valve at the second feed hole (57) is closed. S3. When the pressure at the second feed hole (57) is greater than the maximum threshold of the sensor, the controller controls the valve at the second feed hole (57) to open and the valve at the first feed hole (56) to close. S4. When the pressure at the second feed hole (57) is less than the minimum threshold of the sensor, the controller controls the valve at the second feed hole (57) to close and the valve at the first feed hole (56) to open. S5. When the pressure at the first feed hole (56) is less than the minimum threshold of the sensor, the feeding is completed, the valve at the first feed hole (56) is closed, and the valve at the second feed hole (57) is opened. S6. Start the air pump (12) to rotate forward through the controller. The air pump (12) draws nitrogen from the cooling box (11) into the air cylinder (31); S7. When the internal pressure of the gas cylinder (31) is greater than the maximum threshold of the sensor at the first through hole (34), the controller causes the gas pump (12) to reverse, and the gas pump (12) draws nitrogen from the gas cylinder (31) to the cooling box (11). S8. When the pressure inside the cylinder (31) is less than the minimum threshold of the sensor at the first through hole (34), the controller causes the air pump (12) to rotate in the forward direction, and the air pump (12) re-draws nitrogen from the cooling box (11) into the cylinder (31); S9. After S7 and S8 are completed, the air pump (12) is turned off by the controller and the valve at the discharge port (21) is opened, and the NdFeB waste enters the finished product tank (13).

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