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

Abstract

The invention discloses a neodymium-iron-boron waste mixing and stirring device and a control method thereof, and particularly relates to the technical field of neodymium-iron-boron waste machining, the neodymium-iron-boron waste mixing and stirring device comprises a supporting table, a stirring barrel, a heat conduction assembly, a stirring assembly and a feeding assembly, the heat conduction assembly comprises an air cylinder arranged at the top in the stirring barrel, and a heat conduction piece is arranged in the air cylinder; the stirring assembly comprises a rotating cylinder arranged in the stirring cylinder, a guide groove is formed in the inner wall of the rotating cylinder, the guide groove is matched with a guide column, and the guide column can slide in the guide groove to drive the rotating cylinder to rotate. And the problem that the anaerobic degree in the stirring barrel is reduced due to the fact that sealing at the connecting shaft of the motor and the spiral stirring blade is not tight enough is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of neodymium iron boron waste processing. More specifically, the present invention relates to a neodymium iron boron waste mixing and stirring device and its control method. Background Art

[0002] Neodymium iron boron waste is mechanical processing debris, scraps, sludge debris and residual raw materials generated during the production and processing of neodymium iron boron permanent magnet materials, accounting for 20% - 50% of the neodymium iron boron blank material. These wastes contain 20% - 30% rare earth elements, which are valuable secondary resources. Recycling them is beneficial to environmental protection and the sustainable development of the rare earth industry. During the recovery process of neodymium iron boron waste, these wastes usually need to be ground into powder, reagents are added and mixed and stirred.

[0003] However, since neodymium iron boron powder is extremely easy to react with oxygen, higher requirements are put forward for the oxygen-free purity in the stirring environment. Usually, nitrogen is required to protect the neodymium iron boron powder.

[0004] Chinese Patent with application number 202321831234.1 discloses a neodymium iron boron powder stirring and mixing machine, including a stirring cylinder with spiral stirring blades arranged inside, a stirring motor drivingly connected to the spiral stirring blades is provided at the top of the stirring cylinder, and a feed inlet is opened on the stirring cylinder; a circulating fan, which is respectively communicated with the stirring cylinder through an intake pipeline and an exhaust pipeline; a cold dryer, which is connected in the intake pipeline and is between the circulating fan and the stirring cylinder; a shunt boosting air pump, which is connected in the intake pipeline and is between the cold dryer and the stirring cylinder; there are multiple shunt intake pipes which are respectively connected to the shunt boosting air pump, and multiple air nozzles are opened on the side wall of the stirring cylinder, and the other end of the shunt intake pipe is butted and communicated with the air nozzle. Although this patent can effectively improve the stirring efficiency and reduce the temperature during stirring, if the sealing at the connecting shaft of the motor and the spiral stirring blades is not tight enough, external air will enter the inside of the stirring cylinder, resulting in a decrease in the oxygen-free degree inside the stirring cylinder. At the same time, when the neodymium iron boron waste is fed from the feed inlet, external air will also enter the inside of the stirring cylinder, resulting in a decrease in the oxygen-free degree inside the stirring cylinder. And reducing the temperature inside the stirring cylinder by nitrogen circulation will not only cause the powder to block the nitrogen pipeline, but also carry away a part of the neodymium iron boron powder during the circulation process, resulting in the loss of the mixed neodymium iron boron powder.

[0005] The present invention proposes a neodymium iron boron waste mixing and stirring device 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, an embodiment of the present invention provides a neodymium iron boron waste mixing and stirring device and its control method to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: a neodymium iron boron waste mixing and stirring device, comprising: a support table, a stirring cylinder, a heat conduction component, a stirring component and a feeding component. A cooling box is arranged on the support table, and nitrogen is arranged inside the cooling box. The heat conduction component includes an air cylinder arranged at the inner top of the stirring cylinder. A heat conducting member is arranged inside the air cylinder, and a guiding column is arranged at one end of the heat conducting member. The stirring component includes a rotating cylinder arranged inside the stirring cylinder. A guiding groove is formed on the inner wall of the rotating cylinder, and blades are arranged on the outer wall of the rotating cylinder. The guiding groove and the guiding column cooperate with each other, and the guiding column can slide inside the guiding groove to drive the rotating cylinder to rotate. The feeding component includes a feeding cylinder arranged at the top of the stirring cylinder. A tray is arranged inside the feeding cylinder, and a sealing member is arranged between the tray and the inner top wall of the feeding cylinder. The sealing member, the tray and the inner top wall of the feeding cylinder form a feeding cavity.

[0008] Preferably, a piston plate is slidably connected inside the air cylinder. The piston plate is fixedly connected to the end of the heat conducting member away from the guiding column, and the end of the heat conducting member close to the guiding column penetrates through the air cylinder and extends into the rotating cylinder.

[0009] Preferably, a first through hole is formed at one end of the air cylinder. The first through hole is communicated with the cooling box through a pipeline. A second through hole is formed at the end of the air cylinder away from the first through hole. The second through hole is communicated with the cooling box through a pipeline.

[0010] Preferably, an air pump is arranged between the first through hole and the cooling box. The air pump can work bidirectionally.

[0011] Preferably, a sliding groove is formed inside the feeding cylinder. The tray is slidably connected with the sliding groove. An elastic member is arranged inside the sliding groove. One end of the elastic member is fixedly connected to the inner bottom wall of the sliding groove, and the other end of the elastic member is fixedly connected to the tray.

[0012] Preferably, a first feeding hole is formed at one end of the feeding cylinder. A second feeding hole is formed inside the tray. Valves are arranged at both the first feeding hole and the second feeding hole.

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

[0014] Preferably, a discharge hole is formed at the bottom of the stirring cylinder. A valve is arranged at the discharge hole. A finished product tank is arranged on the support table. One end of the finished product tank is communicated with the stirring cylinder through the discharge hole. A reagent box is arranged at the top of the stirring cylinder. A third through hole is formed at the bottom of the reagent box. A valve is arranged at the third through hole.

[0015] Preferably, the mixing drum is remotely connected to a controller, and the controller is electrically connected to each pressure sensor and valve, and the controller is electrically connected to the air pump.

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

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

[0018] S2. Load the neodymium iron boron waste powder at the feed cylinder. When the pressure at the first feed hole is greater than the maximum threshold of the sensor, start feeding, and the valve at the first feed hole is opened; the valve at the second feed hole is closed;

[0019] S3. When the pressure at the second feed hole is greater than the maximum threshold of the sensor, the controller controls the valve at the second feed hole to open, and the valve at the first feed hole to close;

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

[0021] S5. Loop S3 and S4 until the pressure at the first feed hole is less than the minimum threshold of the sensor, the feeding is completed, the valve at the first feed hole is closed, and the valve at the second feed hole is open;

[0022] S6. Start the air pump to rotate forward through the controller, and the air pump pumps 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 makes the air pump reverse, and the air pump pumps 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 makes the air pump rotate forward, and the air pump pumps nitrogen from the cooling box into the air cylinder again;

[0025] S9. Loop S7 and S8 until after the stirring is completed, turn off the air pump through the controller and open the valve at the discharge hole, and the neodymium iron boron waste enters the finished product tank.

[0026] The technical effects and advantages of the present invention:

[0027] 1. In the present invention, nitrogen is pumped into the air cylinder to drive the piston plate to slide inside the air cylinder, thereby driving the guide column to move inside the guide groove, and then driving the rotating cylinder to rotate to mix and stir the neodymium iron boron waste, avoiding the problem that due to the insufficient tightness of the seal at the connecting shaft of the motor and the spiral stirring blade, external air will enter the mixing drum, resulting in a decrease in the anaerobic degree inside the mixing drum.

[0028] 2. The present invention cools the rotating cylinder by sliding a heat-conducting member inside the rotating cylinder, so as to keep the temperature of the neodymium iron boron waste material suitable during the mixing and stirring process, and prevent the temperature of the neodymium iron boron waste material from gradually rising during the mixing and stirring process, resulting in an increase in the activity of the neodymium iron boron waste material and making it more prone to oxidation.

[0029] 3. During the nitrogen circulation process of the present invention, nitrogen does not come into direct contact with the neodymium iron boron powder, preventing the neodymium iron boron powder from clogging the nitrogen pipeline during the nitrogen circulation process, and at the same time reducing the powder loss due to gas flow.

[0030] 4. The present invention prevents the air at the feeding cylinder from entering the inside of the stirring cylinder and reducing the oxygen-free purity inside the stirring cylinder during feeding by the mutual cooperation of the valves at the first feeding hole and the second feeding hole, and at the same time by the change in the volume of the feeding cavity during the feeding process of the neodymium iron boron waste material. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0034] Figure 4 It is a schematic diagram of the structure of the heat-conducting member of the present invention.

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

[0036] Reference numerals are: 1, support platform; 11, cooling box; 12, air pump; 13, finished product tank; 2, stirring cylinder; 21, discharge hole; 22, reagent box; 23, third through hole; 3, heat-conducting assembly; 31, air cylinder; 311, piston plate; 32, heat-conducting member; 33, guide post; 34, first through hole; 35, second through hole; 4, stirring assembly; 41, rotating cylinder; 42, guide groove; 5, feeding assembly; 51, feeding cylinder; 52, tray; 53, seal; 54, chute; 55, elastic member; 56, first feeding hole; 57, second feeding hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Example 1

[0039] During the actual production process, if the seal at the connecting shaft between the motor and the spiral stirring blade is not tight enough, external air will enter the inside of the stirring cylinder 2, resulting in a decrease in the anaerobic degree inside the stirring cylinder 2. To solve the above problems, this example is specifically invented.

[0040] Please refer to Figures 1 to 5 As shown, a neodymium iron boron waste mixing and stirring device according to an embodiment of the present invention includes a support table 1, a stirring cylinder 2, a heat conduction component 3, a stirring component 4, and a feeding component 5. A cooling box 11 is provided on the support table 1, and nitrogen is provided inside the cooling box 11. The heat conduction component 3 includes an air cylinder 31 provided at the inner top of the stirring cylinder 2. A heat conduction member 32 is provided inside the air cylinder 31, and a guide post 33 is provided at one end of the heat conduction member 32; the stirring component 4 includes a rotating cylinder 41 provided inside the stirring cylinder 2. A guide groove 42 is provided on the inner wall of the rotating cylinder 41, and blades are provided on the outer wall of the rotating cylinder 41; 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 component 5 includes a feeding cylinder 51 provided at the top of the stirring cylinder 2. A tray 52 is provided inside the feeding cylinder 51, and a sealing member 53 is provided between the tray 52 and the inner top wall of the feeding cylinder 51. The sealing member 53, the tray 52, and the inner top wall of the feeding cylinder 51 form a feeding cavity, and the sealing member 53 is made of a deformable flexible material.

[0041] Please refer to 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 conduction member 32 away from the guide post 33, and the end of the heat conduction member 32 close to the guide post 33 penetrates through the air cylinder 31 and extends into the rotating cylinder 41.

[0042] Please refer to Figure 2 As shown, a first through hole 34 is provided at one end of the air cylinder 31. The first through hole 34 is communicated with the cooling box 11 through a pipeline. A second through hole 35 is provided at the end of the air cylinder 31 away from the first through hole 34. The second through hole 35 is communicated with the cooling box 11 through a pipeline. An air pump 12 is provided between the first through hole 34 and the cooling box 11, and the air pump 12 can work bidirectionally.

[0043] Please refer to Figure 2 and Figure 5As shown, a chute 54 is provided inside the feed cylinder 51. The tray 52 is slidably connected to the chute 54. An elastic member 55 is provided inside the chute 54. One end of the elastic member 55 is fixedly connected to the inner bottom wall of the chute 54, and the other end of the elastic member 55 is fixedly connected to the tray 52. A first feed hole 56 is provided at one end of the feed cylinder 51. 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. Pressure sensors are provided at both the first feed hole 56 and the second feed hole 57.

[0044] Please refer to Figure 1 and Figure 2 As shown, a discharge hole 21 is provided at the bottom of the mixing cylinder 2. A valve is provided at the discharge hole 21. A finished product tank 13 is provided on the support table 1. One end of the finished product tank 13 is communicated with the mixing cylinder 2 through the discharge hole 21. A reagent tank 22 is provided at the top of the mixing cylinder 2. A third through hole 23 is provided at the bottom of the reagent tank 22. A valve is provided at the third through hole 23. The mixing cylinder 2 is remotely connected to a controller. The controller is electrically connected to each pressure sensor and valve. 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 filled. After the neodymium iron boron waste is loaded into the mixing drum 2, the air pump 12 is started through the controller, causing the air pump 12 to rotate forward. The air pump 12 pumps the nitrogen inside the cooling box 11 to the top of the air cylinder 31 through the pipeline and the first through hole 34, thereby increasing the pressure inside the air cylinder 31. As a result, the piston plate 311 slides downward inside the air cylinder 31, causing the gas at the bottom of the air cylinder 31 to be squeezed by the piston plate 311 and enter the cooling box 11 through the second through hole 35 and the pipeline. The downward sliding of the piston plate 311 drives the heat conducting member 32 to slide inside the rotating cylinder 41, causing the guide post 33 to slide inside the guide groove 42, and causing the rotating cylinder 41 to rotate to mix and stir the neodymium iron boron waste. When the piston plate 311 slides to the bottom of the air cylinder 31, the gas continues to enter the air cylinder 31, causing the pressure at the top of the air cylinder 31 to gradually increase. When the pressure inside the air cylinder 31 is greater than the maximum threshold of the sensor at the first through hole 34, the controller controls the air pump 12 to rotate in reverse, causing the gas inside the air cylinder 31 to be evacuated to the cooling box 11, causing the piston plate 311 to move upward inside the air cylinder 31, and causing the rotating cylinder 41 to rotate in 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 again to pump nitrogen to the top of the air cylinder 31. By pumping nitrogen into the air cylinder 31, the piston plate 311 is driven to slide inside the air cylinder 31, driving the guide post 33 to move inside the guide groove 42, and driving the rotating cylinder 41 to rotate to mix and stir the neodymium iron boron waste, avoiding the problem that if the seal at the connecting shaft of the motor and the spiral stirring blade is not tight enough, external air will enter the mixing drum 2, resulting in a decrease in the anaerobic degree inside the mixing drum 2.

[0046] Embodiment 2

[0047] It is found during actual use that during the mixing and stirring process, the temperature of the neodymium iron boron waste will gradually increase with stirring, and the activity of the neodymium iron boron waste increases, making it more prone to oxidation. Further improvements are made on the basis of the above embodiments.

[0048] On the basis of the above embodiments, during use, after the nitrogen gas inside is cooled by the cooling box 11, the gas is pumped into the inside of the air cylinder 31 by the air pump 12, so that the piston plate 311 slides downward inside the air cylinder 31 to squeeze the gas at the bottom of the air cylinder 31 back into the cooling box 11 for cooling. As the cooled nitrogen gas continuously enters the inside of the air cylinder 31, the heat conducting member 32 is cooled down. At the same time, the heat conducting member 32 slides inside the rotating cylinder 41 to cool down the rotating cylinder 41. When the piston plate 311 slides upward inside the air cylinder 31, the cooled gas re-enters the bottom of the air cylinder 31 from the cooling box 11 to cool down the heat conducting member 32 again. By continuously entering the inside of the air cylinder 31, the cooled gas cools down the heat conducting member 32, and at the same time, the heat conducting member 32 slides inside the rotating cylinder 41 to cool down the rotating cylinder 41, so that the neodymium iron boron waste material maintains an appropriate temperature during the mixing and stirring process, preventing the temperature of the neodymium iron boron waste material from gradually rising during the mixing and stirring process, resulting in an increase in the activity of the neodymium iron boron waste material and making it more prone to oxidation. At the same time, during the nitrogen gas circulation process, the nitrogen gas does not directly contact the neodymium iron boron powder, preventing the neodymium iron boron powder from blocking the nitrogen gas pipeline during the nitrogen gas circulation process. During the nitrogen gas circulation process, a part of the neodymium iron boron powder will also be carried away, causing the loss of the mixed neodymium iron boron powder.

[0049] Embodiment 3

[0050] During actual use, it is found that when adding the neodymium iron boron waste material into the stirring cylinder 2, air easily enters the inside of the stirring cylinder 2 through the feeding port, resulting in the problem of reduced oxygen-free purity inside the stirring cylinder 2. Further improvements are made on the basis of the above embodiments.

[0051] During use, 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. When loading neodymium iron boron waste, the neodymium iron boron waste is loaded into the feed cylinder 51. As the neodymium iron boron waste continuously enters the feed cylinder 51, the pressure at the first feed hole 56 continuously increases. When the pressure sensor at the first feed hole 56 reaches the maximum 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. The neodymium iron boron waste enters the feed chamber through the first feed hole 56. As the neodymium iron boron waste continuously enters the feed chamber, the pressure on the tray 52 continuously increases, causing the tray 52 to slide downward inside the chute 54, compressing the elastic member 55. At the same time, the pressure at the second feed hole 57 continuously increases. When the pressure at the second feed hole 57 is greater than the maximum threshold of the sensor, the valve at the second feed hole 57 opens and the valve at the first feed hole 56 closes. At this time, the neodymium iron boron waste enters the mixing cylinder 2 through the second feed hole 57. As the neodymium iron boron waste gradually enters the mixing cylinder 2, the pressure on the tray 52 continuously decreases, causing the elastic member 55 to expand and drive the tray 52 to slide upward. At the same time, the pressure at the second feed hole 57 gradually decreases. When the pressure at the second feed hole 57 is less than the minimum threshold of the sensor, the valve at the second feed hole 57 closes and the valve at the first feed hole 56 opens. The neodymium iron boron waste re-enters the feed chamber. After the neodymium iron boron waste continuously enters the mixing cylinder 2 through the feed chamber, the neodymium iron boron waste at the first feed hole 56 gradually decreases, and the pressure at the first feed hole 56 continuously decreases. When the pressure at the first feed hole 56 is less than the minimum threshold of the sensor, the valve at the first feed hole 56 closes and the valve at the second feed hole 57 opens, and the feeding is completed. By changing the volume of the feed chamber through the movement of the tray 52 inside the chute 54, the volume of the feed chamber increases as the neodymium iron boron waste increases and decreases as the neodymium iron boron waste enters the mixing cylinder 2. Through the cooperation of the valves at the first feed hole 56 and the second feed hole 57, and at the same time, the volume of the feed chamber changes with the feeding process of the neodymium iron boron waste, thus preventing the problem that the air at the feed cylinder 51 enters the mixing cylinder 2 during feeding, resulting in a decrease in the oxygen-free purity inside the mixing cylinder 2.

[0052] Embodiment 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 neodymium iron boron 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, start feeding, open the valve at the first feed hole 56; close the valve at the second feed hole 57;

[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 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;

[0058] S5. Loop S3 and S4 until the pressure at the first feed hole 56 is less than the minimum threshold of the sensor. Then 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;

[0059] S6. Start the positive rotation of the air pump 12 through the controller. The air pump 12 pumps nitrogen from the cooling tank 11 into the inside of the air cylinder 31;

[0060] S7. When the pressure inside the air cylinder 31 is greater than the maximum threshold of the sensor, the controller makes the air pump 12 reverse. The air pump 12 pumps nitrogen from the air cylinder 31 to the cooling tank 11;

[0061] S8. When the pressure inside the air cylinder 31 is less than the minimum threshold of the sensor, the controller makes the air pump 12 rotate forward. The air pump 12 pumps nitrogen from the cooling tank 11 into the inside of the air cylinder 31 again;

[0062] S9. Loop S7 and S8 until the stirring is completed. Then, through the controller, turn off the air pump 12 and open the valve at the discharge hole 21. The neodymium iron boron waste enters the inside of the finished product tank 13.

[0063] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A NdFeB waste mixing and stirring device, comprising a support platform (1) and a stirring drum (2), wherein a cooling box (11) is arranged on the support platform (1), and nitrogen is arranged inside the cooling box (11), characterized in that: Also includes: A heat-conducting component (3), the heat-conducting component (3) comprising a gas cylinder (31) arranged at the top of the mixing drum (2), a heat-conducting member (32) being arranged inside the gas cylinder (31), and a guide column (33) being arranged at one end of the heat-conducting member (32); A stirring assembly (4), the stirring assembly (4) comprising a rotating drum (41) arranged inside the stirring drum (2), the inner wall of the rotating drum (41) being provided with a guide groove (42), and the outer wall of the rotating drum (41) being provided with blades; The guide groove (42) and the guide column (33) are matched, and the guide column (33) can slide inside the guide groove (42) to drive the rotating drum (41) to rotate; A feeding assembly (5), the feeding assembly (5) comprising a feeding barrel (51) arranged at the top of a mixing barrel (2), a tray (52) being arranged inside the feeding barrel (51), a sealing member (53) being arranged between the tray (52) and the inner top wall of the feeding barrel (51), and the sealing member (53), the tray (52) and the inner top wall of the feeding barrel (51) forming a feeding chamber.

2. The NdFeB waste mixing and stirring device according to claim 1, characterized in that: A piston plate (311) is slidably connected to the interior of the gas cylinder (31), and the piston plate (311) is fixedly connected to an end of the heat conducting member (32) away from the guide column (33), and an end of the heat conducting member (32) close to the guide column (33) penetrates the gas cylinder (31) and extends into the interior of the rotating cylinder (41).

3. The NdFeB waste mixing and stirring device according to claim 2, characterized in that: A first through hole (34) is formed at one end of the air cylinder (31), and the first through hole (34) is connected to the cooling box (11) through a pipeline. A second through hole (35) is formed at one end of the air cylinder (31) away from the first through hole (34), and the second through hole (35) is connected to the cooling box (11) through a pipeline.

4. The NdFeB waste mixing and stirring device according to claim 3, 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) is capable of bidirectional operation.

5. The NdFeB waste mixing and stirring device according to claim 4, characterized in that: A slide groove (54) is provided inside the feed barrel (51), and the tray (52) is slidably connected to the slide groove (54). An elastic member (55) is provided inside the slide groove (54), and one end of the elastic member (55) is fixedly connected to the inner bottom wall of the slide groove (54), and the other end of the elastic member (55) is fixedly connected to the tray (52).

6. The NdFeB waste mixing and stirring device according to claim 5, characterized in that: A first feed hole (56) is provided at one end of the feed cylinder (51), a second feed hole (57) is provided in the tray (52), and valves are provided at both the first feed hole (56) and the second feed hole (57).

7. The NdFeB waste mixing and stirring device according to claim 6, characterized in that: A pressure sensor is provided at the first through hole (34) of the gas cylinder (31), and pressure sensors are provided at both the first feed hole (56) and the second feed hole (57).

8. The NdFeB waste mixing and stirring device according to claim 7, characterized in that: The mixing drum (2) is provided with a discharge hole (21) at the bottom thereof, and a valve is arranged at the discharge hole (21); a finished product tank (13) is arranged on the support platform (1), and one end of the finished product tank (13) is connected to the mixing drum (2) through the discharge hole (21); a reagent box (22) is arranged on the top of the mixing drum (2); a third through hole (23) is provided at the bottom thereof, and a valve is arranged at the third through hole (23).

9. The NdFeB waste mixing and stirring device according to claim 8, characterized in that: The mixing drum (2) is remotely connected to a controller, and the controller is electrically connected to various pressure sensors and valves, and the controller is electrically connected to an air pump (12).

10. A method for controlling a NdFeB waste mixing and stirring device, used for controlling the NdFeB waste mixing and stirring device as claimed in claim 9, characterized in that: The following steps are involved: 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 opened; S2. Loading the NdFeB waste powder into the feed barrel (51), when the pressure at the first feed hole (56) is greater than the maximum threshold of the sensor, starting to feed, 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. Cycle S3 and S4 until 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. The air pump (12) is started forward by the controller, and the air pump (12) pumps 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) pumps nitrogen from the gas cylinder (31) to the cooling box (11); S8. When the internal pressure of the gas cylinder (31) is less than the minimum threshold of the sensor at the first through hole (34), the controller causes the gas pump (12) to rotate forward, and the gas pump (12) re-pumps nitrogen from the cooling box (11) into the gas cylinder (31); S9. After the stirring is completed by looping S7 and S8, the air pump (12) is turned off through the controller and the valve at the discharge hole (21) is opened, and the NdFeB waste enters the finished product tank (13).

Images