Bonding magnetic powder preparation device

Abstract

The invention provides a bonded magnetic powder preparation device. The bonded magnetic powder preparation device comprises a furnace body with a containing cavity; the furnace pipe is arranged in the containing cavity, and the furnace pipe is provided with at least one reaction cavity; the heat conduction structure is configured to be capable of forming heat conduction contact with at least part of the outer wall surface of the reaction cavity or forming at least part of the side wall of the reaction cavity; the heating assembly is used for heating the heat conduction structure; and the cooling assembly comprises a conveying pipeline, a cooling medium is introduced into the conveying pipeline, and the cooling medium is used for cooling the heat conduction structure. According to the technical scheme, the bonded magnetic powder preparation device can solve the problem that the performance of prepared magnetic powder is low due to the fact that existing gas-solid reaction equipment mainly depends on a heating body to heat a reaction kettle, temperature response is slow and temperature control lags behind.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum gas-solid reaction, and in particular to a device for preparing bonded magnetic powder. Background Art

[0002] Anisotropic rare earth bonded magnetic powder has the advantages of high magnetic properties and short preparation process, and is widely used in high-tech fields such as micro motors, new energy vehicles, and smart home appliances. At present, the preparation of anisotropic rare earth bonded magnetic powder generally adopts the "Hydrogenation-Disproportionation-Desorption-Recombination" (HDDR method).

[0003] The preparation process using the above method is very sensitive to the reaction temperature, and the reaction temperature needs to be precisely controlled throughout the process. Since the hydrogen absorption process is an exothermic reaction and the dehydrogenation process is an endothermic reaction, the absorption and release of heat by the materials during the reaction makes temperature control more difficult. However, the existing gas-solid reaction equipment mainly relies on the heating element to heat the reactor, which has a slow temperature response and a lagging temperature control, resulting in low performance of the prepared magnetic powder. Summary of the invention

[0004] The main purpose of the present invention is to provide a bonded magnetic powder preparation device, which can solve the problem that the existing gas-solid reaction equipment mainly relies on a heating element to heat the reactor, has a slow temperature response, and lags in temperature control, resulting in low performance of the prepared magnetic powder.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a bonded magnetic powder preparation device, comprising: a furnace body, having a containing cavity; a furnace core, arranged in the containing cavity, the furnace core having at least one reaction cavity; a heat-conducting structure, which is constructed to form a heat-conducting contact with at least a portion of the outer wall surface of the reaction cavity or to form at least a portion of the side wall of the reaction cavity; a heating component, which is used to heat the heat-conducting structure; and a cooling component, which comprises a conveying pipeline, the conveying pipeline being constructed to allow a cooling medium to pass therein, and the cooling medium is used to cool the heat-conducting structure.

[0006] Furthermore, the furnace also has an inner cavity and at least one temperature control cavity. The heat-conducting structure is installed in the inner cavity and divides the inner cavity into at least one reaction cavity and at least one temperature control cavity. The heating component includes a first heating structure, which is arranged in the temperature control cavity. The cooling medium is connected to the temperature control cavity.

[0007] Furthermore, there are at least two reaction chambers and at least two temperature control chambers, which are alternately arranged along the circumference of the furnace, and the temperature control chamber extends along the length direction of the furnace. The first end of the conveying pipe is connected to the first end of the temperature control chamber, the second end of the temperature control chamber is connected to the accommodating chamber, and the second end of the conveying pipe is connected to the accommodating chamber.

[0008] Furthermore, the heat-conducting structure includes at least one heat-conducting split body, which is installed in the inner cavity of the furnace and divides the inner cavity into at least one reaction chamber and at least one temperature control chamber. The first heating structure is arranged adjacent to the heat-conducting split body, and the part of the side wall of the temperature control chamber formed by the heat-conducting split body is a heat exchange part, and the first heating structure can cover at least part of the heat exchange part.

[0009] Furthermore, the heat conducting body is divided into two, and the two heat conducting bodies are perpendicular to each other.

[0010] Furthermore, the bonded magnetic powder preparation device also includes a second heating structure, which is installed in the accommodating cavity and is sleeved on the outer periphery of the furnace core. The length extension direction of the second heating structure is the same as the length extension direction of the furnace core, and the entire furnace core is located within the heating area of ​​the second heating structure.

[0011] Furthermore, the bonded magnetic powder preparation device also includes a driving structure, which includes a driving part and a rotating shaft. The driving part is drivingly connected to the rotating shaft, and the rotating shaft is connected to the furnace core to drive the furnace core to rotate.

[0012] Furthermore, the bonded magnetic powder preparation device also includes a power supply structure, which is sleeved on the rotating shaft and is electrically connected to the first heating structure.

[0013] Furthermore, the power supply structure includes at least one first electrode, which is sequentially sleeved on the outer circumference of the rotating shaft, and at least one first electrode is arranged in a one-to-one correspondence with at least one first heating structure, and the first electrode is electrically connected to the corresponding first heating structure.

[0014] Furthermore, the power supply structure also includes at least one brush, and the at least one brush is arranged in a one-to-one correspondence with at least one first electrode. Each brush includes a contact portion and a clamping portion. One end of each contact portion is constructed to be connected to the electric control cabinet, and the other end of each contact portion is constructed to contact the first electrode corresponding thereto. The clamping portion is installed on the contact portion, and the clamping portion is used to clamp the contact portion so that the contact portion always maintains contact with the first electrode corresponding thereto.

[0015] Furthermore, the conveying pipeline also includes a first branch pipeline and a second branch pipeline, one end of the first branch pipeline is connected to the accommodating chamber, the other end of the first branch pipeline is connected to one end of the second branch pipeline, the other end of the second branch pipeline is connected to the first end of the temperature control chamber, part of the rotating shaft is located in the second branch pipeline, and the first electrode is located in the second branch pipeline.

[0016] Furthermore, an air inlet communicating with the accommodating chamber is provided on the furnace body, and the reaction chamber is communicated with the accommodating chamber; and / or a plurality of stirring structures are provided on the inner wall of the reaction chamber.

[0017] The technical solution of the present invention is applied, and a furnace body, a furnace, a heat-conducting structure, a heating component and a cooling component are provided. The heat-conducting structure is constructed to be able to form a heat-conducting contact with at least part of the outer wall surface of the reaction chamber or to form at least part of the side wall of the reaction chamber, which can greatly improve the heat conduction efficiency. When the heat-conducting structure forms a heat-conducting contact with at least part of the outer wall surface of the reaction chamber, after the heating component heats the heat-conducting structure, the heat of the heat-conducting structure can be quickly transferred from the heat-conducting structure to the reaction chamber, and when the reaction process needs to be cooled, after the cooling medium cools the heat-conducting structure, the heat in the reaction chamber can be directly transferred to the heat-conducting structure to achieve cooling of the reaction chamber. When the heat-conducting structure forms at least part of the side wall of the reaction chamber, the heating component heating the heat-conducting structure is equivalent to directly heating the reaction chamber, and when the reaction process needs to be cooled, the cooling medium cooling the heat-conducting structure is equivalent to directly cooling the reaction chamber. Through the above arrangement, rapid heating and cooling of materials (such as rare earth materials) in the reaction chamber can be achieved, and precise control and rapid response of the reaction chamber temperature can be achieved, solving the problem of temperature control lag in traditional equipment, thereby ensuring the performance of the prepared magnetic powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A partial structural schematic diagram of a bonded magnetic powder preparation device according to an embodiment of the present invention is shown;

[0020] Figure 2 A partial structural schematic diagram of a bonded magnetic powder preparation device according to an embodiment of the present invention is shown;

[0021] Figure 3 A partial structural schematic diagram of a bonded magnetic powder preparation device according to an embodiment of the present invention is shown;

[0022] Figure 4 A partial structural schematic diagram of a bonded magnetic powder preparation device according to an embodiment of the present invention is shown;

[0023] Figure 5 A partial structural schematic diagram of a bonded magnetic powder preparation device according to an embodiment of the present invention is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. furnace body; 11. containing chamber; 12. air inlet; 20. furnace core; 21. reaction chamber; 22. temperature control chamber; 30. cooling and cooling component; 31. conveying pipeline; 311. first branch pipeline; 312. second branch pipeline; 32. fan; 33. heat exchanger; 40. heat conduction structure; 41. heat conduction split body; 50. first heating structure; 51. heating wire; 52. refractory structure; 60. second heating structure; 61. Two electrodes; 70, driving structure; 71, driving part; 72, rotating shaft; 80, power supply structure; 81, first electrode; 82, brush; 821, contact part; 822, pressing part; 83, insulating sleeve; 90, stirring structure; 100, first temperature detection part; 200, second temperature detection part; 201, wire; 202, detection part; 300, connecting pipe; 400, air inlet pipe; 401, switch valve; 500, material. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] See also Figures 1 to 5 As shown, the present invention provides a bonded magnetic powder preparation device, which includes: a furnace body 10, having a accommodating chamber 11; a furnace core 20, which is arranged in the accommodating chamber 11, and the furnace core 20 has at least one reaction chamber 21; a heat-conducting structure 40, which is constructed to be able to form a heat-conducting contact with at least a portion of the outer wall surface of the reaction chamber 21 or to form at least a portion of the side wall of the reaction chamber 21; a heating component, which is used to heat the heat-conducting structure 40; a cooling component 30, including a conveying pipe 31, and the conveying pipe 31 is constructed to pass a cooling medium, and the cooling medium is used to cool the heat-conducting structure 40.

[0028] In this embodiment, the preparation process of the bonded magnetic powder is carried out in the reaction chamber 21. The heat-conducting structure 40 is configured to form a heat-conducting contact with at least part of the outer wall surface of the reaction chamber 21 or to form at least part of the side wall of the reaction chamber 21, which can greatly improve the heat conduction efficiency. When the heat-conducting structure 40 forms a heat-conducting contact with at least part of the outer wall surface of the reaction chamber 21, after the heating component heats the heat-conducting structure 40, the heat of the heat-conducting structure 40 can be quickly transferred from the heat-conducting structure 40 to the reaction chamber 21, and when the reaction process needs to be cooled, after the cooling medium cools the heat-conducting structure 40, the heat in the reaction chamber 21 can be directly transferred to the heat-conducting structure 40, so as to achieve the cooling of the reaction chamber 21. When the heat-conducting structure 40 forms at least part of the side wall of the reaction chamber 21, the heating component heating the heat-conducting structure 40 is equivalent to directly heating the reaction chamber 21, and when the reaction process needs to be cooled, the cooling medium cooling the heat-conducting structure 40 is equivalent to directly cooling the reaction chamber 21. Through the above-mentioned arrangement, rapid heating and cooling of the material 500 (such as rare earth material) in the reaction chamber 21 can be achieved, and precise control and rapid response of the temperature of the reaction chamber 21 can be achieved, thereby solving the problem of temperature control lag in traditional equipment, thereby ensuring the performance of the prepared magnetic powder. In the stage where heat release is required, such as hydrogen absorption reaction, the heating component can quickly replenish the heat lost due to reaction heat release, ensuring that the reaction temperature is maintained at an optimal state. In the stage where heat absorption is required, such as dehydrogenation reaction, when the reaction heat release causes the temperature to be too high, the cooling component 30 can respond immediately to avoid the degradation of magnetic powder performance due to excessive temperature.

[0029] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the furnace 20 also has an inner cavity and at least one temperature control cavity 22, the heat conductive structure 40 is installed in the inner cavity and divides the inner cavity into at least one reaction cavity 21 and at least one temperature control cavity 22, the heating component includes a first heating structure 50, the first heating structure 50 is arranged in the temperature control cavity 22, and the cooling medium is connected to the temperature control cavity 22.

[0030] In this embodiment, the inner cavity in the furnace 20 is divided into at least one reaction chamber 21 and at least one temperature control chamber 22 by the heat-conducting structure 40. At this time, the heat-conducting structure 40 serves as a part of the side wall of the reaction chamber 21 and also serves as a part of the side wall of the temperature control chamber 22. Since the first heating structure 50 is directly placed in the temperature control chamber 22, the first heating structure 50 can directly heat the heat-conducting structure 40, that is, it can directly heat the material 500 in the reaction chamber 21 without the need for heat conduction through the entire wall surface of the furnace 20. The connection between the cooling medium and the temperature control chamber 22 enables the cooling medium to directly act on the temperature control chamber 22 when the temperature needs to be quickly lowered, and part of the side wall of the temperature control chamber 22 is also the side wall of the reaction chamber 21, so that the heat can be quickly taken away, so that the reaction temperature can be more accurately adjusted to the required level, avoiding the problem of magnetic powder performance degradation caused by temperature control lag in traditional equipment.

[0031] In addition, in the preparation process of anisotropic bonded magnetic powder, the HDDR method involves hydrogen absorption and dehydrogenation reactions, and these two processes will release heat and absorb heat respectively. Through the above-mentioned settings, the heating and cooling of the temperature control chamber 22 can respond quickly to these two changes. When heat release (such as hydrogen absorption reaction) is required, the heating component can quickly replenish heat; when heat absorption (such as dehydrogenation reaction) is required, the cooling component 30 can immediately lower the temperature. By accurately controlling the temperature of the reaction chamber 21 through the temperature control chamber 22, the reaction conditions can be optimized so that the reaction can be carried out at the optimal temperature, thereby improving the reaction efficiency. At the same time, the material 500 in the reaction chamber 21 can be accurately controlled and quickly changed in temperature to better match the complex preparation process of anisotropic rare earth bonded magnetic powder.

[0032] See also Figures 1 to 5 As shown, in one embodiment of the present invention, there are at least two reaction chambers 21 and at least two temperature control chambers 22, and the at least two reaction chambers 21 and the at least two temperature control chambers 22 are alternately arranged along the circumference of the furnace 20, and the temperature control chamber 22 extends along the length direction of the furnace 20. The first end of the conveying pipe 31 is connected to the first end of the temperature control chamber 22, the second end of the temperature control chamber 22 is connected to the accommodating chamber 11, and the second end of the conveying pipe 31 is connected to the accommodating chamber 11.

[0033] In this embodiment, by arranging the reaction chamber 21 and the temperature control chamber 22 alternately along the circumference of the furnace 20, it is possible to ensure that the heat is evenly distributed in the furnace 20, and because the temperature control chamber 22 is arranged adjacent to the reaction chamber 21, it can quickly respond to the temperature change in the reaction chamber 21, achieve precise temperature control, and eliminate the temperature gradient that may exist in traditional equipment, ensuring the uniformity of heating of the material 500 during the entire reaction process, thereby improving the performance consistency of the bonded magnetic powder. In addition, the delivery pipeline 31 for delivering the cooling medium is connected to the temperature control chamber 22, and the cooling medium can be quickly introduced for cooling. At the same time, because the temperature control chamber 22 extends along the length direction of the furnace 20, the cooling medium can be evenly distributed along the entire length direction, achieving rapid and effective cooling.

[0034] In addition, the first end of the delivery pipe 31 is connected to the first end of the temperature control chamber 22, the second end of the temperature control chamber 22 is connected to the accommodating chamber 11, and the second end of the delivery pipe 31 is connected to the accommodating chamber 11, which can form a circulation path for the cooling medium, reduce the frequent replenishment of the cooling medium, and reduce the maintenance frequency and cost.

[0035] In one embodiment, the heat-conducting structure 40 is made of a high-temperature resistant material with good thermal conductivity, such as pure molybdenum or a molybdenum alloy.

[0036] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the heat-conducting structure 40 includes at least one heat-conducting split body 41, and the at least one heat-conducting split body 41 is installed in the inner cavity of the furnace 20, and divides the inner cavity into at least one reaction chamber 21 and at least one temperature control chamber 22. The first heating structure 50 is arranged adjacent to the heat-conducting split body 41, and the part of the side wall of the temperature control chamber 22 formed by the heat-conducting split body 41 is a heat exchange part, and the first heating structure 50 can cover at least part of the heat exchange part.

[0037] In this embodiment, the heat conducting split body 41 is installed in the inner cavity of the furnace 20 and divides the inner cavity into at least one reaction cavity 21 and at least one temperature control cavity 22. At this time, the heat conducting split body 41 serves as part of the side wall of the reaction cavity 21 and also as part of the side wall of the temperature control cavity 22. The first heating structure 50 can cover at least part of the heat exchange part, so that the heat of the first heating structure 50 can be quickly transferred to the material 500 in the reaction cavity 21, shortening the temperature response time and avoiding the lag of temperature control. The first heating structure 50 is arranged adjacent to the heat conducting split body 41, which can accurately control the temperature of the reaction cavity 21 and allow the temperature of the reaction cavity 21 to be fine-tuned to meet the reaction requirements at different stages, especially when dealing with exothermic or endothermic reactions, it can be quickly adjusted to maintain the reaction temperature within the required range.

[0038] See also Figures 1 to 5As shown, in one embodiment of the present invention, there are two heat-conducting split bodies 41, and the two heat-conducting split bodies 41 are perpendicular to each other.

[0039] In this embodiment, the heat-conducting structure 40 is a cross-shaped structure formed by two mutually perpendicular heat-conducting split bodies 41. The heat-conducting structure 40 is arranged at the center of the furnace 20 and divides the furnace 20 into two reaction chambers 21 and two temperature-control chambers 22. The two perpendicular heat-conducting split bodies 41 can provide a larger heat exchange surface area and improve the heat conduction efficiency. In addition, the two perpendicular heat-conducting split bodies 41 help to form a more optimized layout of the temperature-control chamber 22, ensuring that each reaction chamber 21 can efficiently exchange heat with the corresponding temperature-control chamber 22, which can reduce heat loss and improve the accuracy of temperature control.

[0040] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device also includes a second heating structure 60, which is installed in the accommodating cavity 11, and the second heating structure 60 is sleeved on the outer periphery of the furnace 20. The length extension direction of the second heating structure 60 is the same as the length extension direction of the furnace 20, and the furnace 20 is entirely located within the heating area of ​​the second heating structure 60.

[0041] In this embodiment, the second heating structure 60, as an additional heating source, can supplement or adjust the heating state of the furnace 20 to cope with the heat absorption and release changes during the reaction process, ensuring that the reaction is carried out at the optimal temperature. Through the direct heating of the second heating structure 60, the temperature of the furnace 20 and the internal material 500 can be quickly increased, which can shorten the preheating time and improve production efficiency. The furnace 20 is entirely located in the heating area of ​​the second heating structure 60, which helps to maintain the temperature in the furnace 20 stable, reduce heat loss, and reduce the energy consumption of the entire device.

[0042] When the material 500 in the furnace 20 undergoes an endothermic reaction, the second heating structure 60 heats the furnace 20, and at the same time, the first heating structure 50 is heated synchronously, and the heat is compensated to the reaction chamber 21 through the heat-conducting structure 40, so as to quickly rise to the temperature required for the reaction; when the material 500 in the furnace 20 undergoes an exothermic reaction, at this time, the temperature in the furnace 20 is higher than the temperature required for the reaction, and the furnace 20 needs to be cooled. At this time, the second heating structure 60 stops heating the furnace 20, and the first heating structure 50 also stops heating, and the heat-conducting structure 40 is cooled by the cooling component 30, thereby achieving heat dissipation of the reaction chamber 21, and quickly reducing the temperature of the reaction chamber 21 to the temperature required for the reaction to maintain the optimal reaction temperature.

[0043] In one embodiment, the second heating structure 60 is a heating belt, and the second heating structure 60 further includes two second electrodes 61 , and the two second electrodes 61 are used to supply power to the heating belt.

[0044] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device also includes a driving structure 70, the driving structure 70 includes a driving part 71 and a rotating shaft 72, the driving part 71 is drivingly connected to the rotating shaft 72, and the rotating shaft 72 is connected to the furnace 20 to drive the furnace 20 to rotate.

[0045] Through the above arrangement, the furnace 20 can be rotated.

[0046] In one embodiment, the driving structure 70 drives the furnace 20 to rotate, and the rotation speed is adjustable, and the value range of the rotation speed is 5 rpm to 30 rpm.

[0047] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device further includes a power supply structure 80 , which is sleeved on the rotating shaft 72 , and the power supply structure 80 is electrically connected to the first heating structure 50 .

[0048] In this embodiment, the power supply structure 80 is sleeved on the rotating shaft 72, so that even when the furnace 20 is rotating, the first heating structure 50 can obtain a stable power supply, thereby enabling the first heating structure 50 to continue to work under dynamic conditions.

[0049] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the power supply structure 80 includes at least one first electrode 81, and at least one first electrode 81 is sequentially sleeved on the outer periphery of the rotating shaft 72. At least one first electrode 81 is arranged in a one-to-one correspondence with at least one first heating structure 50, and the first electrode 81 is electrically connected to the corresponding first heating structure 50.

[0050] In this embodiment, the first electrode 81 is sleeved on the rotating shaft 72, so that during the rotation of the furnace 20, the first heating structure 50 can also obtain a stable power supply, thereby realizing the continuous operation of the first heating structure 50 under dynamic conditions. Since the first electrode 81 and the first heating structure 50 are arranged in a one-to-one correspondence, independent power supply and temperature control can be achieved for each heating area. During the reaction process, fine-tuning can be performed according to the temperature requirements of different areas to adapt to changes in reaction conditions, thereby improving the accuracy of temperature control. In addition, through the direct electrical connection between the first electrode 81 and the first heating structure 50, the loss during power transmission can be reduced and the heating efficiency can be improved.

[0051] In one embodiment, there are at least two first electrodes 81 , and an insulating sleeve 83 is disposed between two adjacent first electrodes 81 . The provision of the insulating sleeve 83 can effectively prevent electrical short circuits between two adjacent first electrodes 81 , thereby improving the electrical safety and reliability of the device.

[0052] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the power supply structure 80 also includes at least one brush 82, and the at least one brush 82 is arranged in a one-to-one correspondence with the at least one first electrode 81. Each brush 82 includes a contact portion 821 and a clamping portion 822. One end of each contact portion 821 is configured to be connected to the electric control cabinet, and the other end of each contact portion 821 is configured to contact the first electrode 81 corresponding thereto. The clamping portion 822 is installed on the contact portion 821, and the clamping portion 822 is used to clamp the contact portion 821 so that the contact portion 821 always maintains contact with the first electrode 81 corresponding thereto.

[0053] In this embodiment, the contact portion 821 of the brush 82 maintains stable contact with the first electrode 81, ensuring continuous transmission of power even during the rotation of the furnace 20. The setting of the pressing portion 822 further strengthens the contact between the contact portion 821 and the first electrode 81, avoiding poor contact or power interruption that may occur due to rotation, and ensuring the continuity and stability of the heating process. At least one brush 82 is set in a one-to-one correspondence with at least one first electrode 81, so that each heating area can independently receive and adjust the power supply, thereby achieving more precise temperature control.

[0054] In one embodiment, the pressing portion 822 is a spring.

[0055] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the delivery pipeline 31 also includes a first branch pipeline 311 and a second branch pipeline 312, one end of the first branch pipeline 311 is connected to the accommodating chamber 11, the other end of the first branch pipeline 311 is connected to one end of the second branch pipeline 312, the other end of the second branch pipeline 312 is connected to the first end of the temperature control chamber 22, part of the rotating shaft 72 is located in the second branch pipeline 312, and the first electrode 81 is located in the second branch pipeline 312.

[0056] In this embodiment, the first electrode 81 is placed inside the second branch pipe 312, which can effectively protect the first electrode 81 from external environmental factors (such as high temperature, corrosive gas, etc.). The internal space of the second branch pipe 312 is used to install the rotating shaft 72 and the first electrode 81, thereby realizing effective utilization of space resources.

[0057] In addition, one end of the first branch pipe 311 is connected to the accommodating chamber 11, the other end of the first branch pipe 311 is connected to one end of the second branch pipe 312, the other end of the second branch pipe 312 is connected to the first end of the temperature control chamber 22, and the second end of the temperature control chamber 22 is connected to the accommodating chamber 11, which can form a circulation path for the cooling medium, reduce the frequent replenishment of the cooling medium, and reduce the maintenance frequency and cost.

[0058] See also Figures 1 to 5As shown, in one embodiment of the present invention, the cooling medium is cold air, and the bonded magnetic powder preparation device also includes a fan 32 and a heat exchanger 33, which are both installed on the first branch pipe 311. When the reaction chamber 21 needs to be cooled, the fan 32 starts to operate to generate a strong airflow to suck the external cold air into the first branch pipe 311. The rotation speed and airflow intensity of the fan 32 can be adjusted as needed to quickly or gradually cool down. The cold air sucked into the first branch pipe 311 is first pre-cooled by the heat exchanger 33 to ensure that the temperature of the air entering the temperature control chamber 22 is lower than the ambient temperature, thereby improving the cooling efficiency. The pre-cooled cold air is introduced into the temperature control chamber 22 through the first branch pipe 311, and the cold air contacts the heat-conducting structure 40 to quickly absorb heat. Since the heat-conducting structure 40 has good thermal conductivity, the low temperature of the cold air can be quickly transferred to the reaction chamber 21 to achieve cooling.

[0059] See also Figures 1 to 5 As shown, in one embodiment of the present invention, an air inlet 12 communicating with the accommodating chamber 11 is disposed on the furnace body 10 , and the reaction chamber 21 is communicated with the accommodating chamber 11 .

[0060] In this embodiment, the provision of the air inlet 12 allows a specific reaction gas (such as hydrogen) or an inert gas to be introduced into the accommodating chamber 11. When preparing anisotropic rare earth bonded magnetic powder, since the reaction chamber 21 is connected to the accommodating chamber 11, the gas introduced by the air inlet 12 can be evenly distributed in the reaction chamber 21, thereby avoiding inconsistent reaction conditions caused by uneven gas distribution.

[0061] In one embodiment, the reaction chamber 21 passes through the furnace 20 along the length direction of the furnace 20, and the bonded magnetic powder preparation device also includes at least two covers, each of which is provided with a cover at both ends of each reaction chamber 21, and a through hole is provided at the center position of each cover, and the hydrogen or inert gas introduced into the accommodating chamber 11 can enter the reaction chamber 21 through the through hole.

[0062] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device further includes an air inlet pipe 400 and a switch valve 401 disposed on the air inlet pipe 400. The air inlet pipe 400 is connected to the air inlet port 12, and the air inlet pipe 400 is used to transport hydrogen or inert gas.

[0063] See also Figures 1 to 5 As shown, in one embodiment of the present invention, a plurality of stirring structures 90 are disposed on the inner wall of the reaction chamber 21 .

[0064] In this embodiment, the setting of the stirring structure 90 can, on the one hand, make the material 500 in the reaction chamber 21 evenly dispersed in the reaction chamber 21, avoid the accumulation of the material 500, and ensure the uniformity of the reaction. On the other hand, the stirring structure 90 can enhance the heat exchange in the reaction chamber 21. By stirring the material 500, the material 500 can fully contact the inner wall of the reaction chamber 21, thereby improving the heat exchange efficiency of the heat conductive structure 40.

[0065] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the stirring structure 90 is a protrusion. A plurality of stirring structures 90 are evenly arranged on the inner wall of the reaction chamber 21. When the furnace 20 rotates under the drive of the driving structure 70, the stirring structure 90 can stir the material 500 in the reaction chamber 21.

[0066] In one embodiment, the first heating structure 50 includes a refractory structure 52 and a plurality of heating wires 51, and the plurality of heating wires 51 are inserted into the refractory structure 52. The refractory structure 52 has good thermal conductivity and heat insulation properties. Inserting the heating wires 51 into the refractory structure 52 can ensure that heat is quickly and evenly transferred to the heat-conducting structure. In addition, the refractory structure 52 can serve as a protective layer for the heating wires 51, which can absorb and disperse the thermal stress generated during the heating process, reduce the possibility of oxidation, fatigue or fracture of the heating wires 51 due to high temperature, and thus extend the service life of the heating wires 51.

[0067] In one embodiment, the refractory structure 52 is refractory bricks or thermal insulation wool.

[0068] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device also includes a first temperature detection member 100 and a second temperature detection member 200. The first temperature detection member 100 is used to detect the temperature outside the furnace 20, and the second temperature detection member 200 is used to detect the temperature of the inner cavity of the furnace 20.

[0069] In one embodiment, the first temperature detection member 100 is a thermocouple.

[0070] In one embodiment, the temperature measuring point of the second temperature detection element 200 is located at the center of the reaction chamber 21. The temperature change at the center can more accurately reflect the dynamic change of the overall temperature of the reaction chamber 21, providing a reliable basis for adjusting heating or cooling.

[0071] See also Figures 1 to 5As shown, in one embodiment of the present invention, the bonded magnetic powder preparation device also includes a vacuum device, which is used to extract the air and other gases originally present in the reaction chamber 21 to prevent oxygen, water vapor, etc. in the air from reacting with the rare earth material and affecting the purity and performance of the bonded magnetic powder. The vacuum device can also be used to control the gas pressure in the receiving chamber 11. When the reaction pressure is too high, the gas can be discharged from the receiving chamber 11 through the vacuum device to keep the reaction pressure constant.

[0072] It should be noted that the above-mentioned vacuum device adopts existing technology, and the specific structure will not be described here.

[0073] In one embodiment, the vacuum device includes a connecting pipe 300 , which is in communication with the accommodating chamber 11 .

[0074] In one embodiment, the rotating shaft 72 is a hollow structure, and the second temperature detection member 200 includes a detection portion 202 and a wire 201 connected to each other. Since the rotating shaft 72 is a hollow structure, it can be used to accommodate the wire 201 of the second temperature detection member 200 .

[0075] In one embodiment, the detection unit 202 is a thermocouple.

[0076] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: a furnace body, a furnace, a heat-conducting structure, a heating component and a cooling component are provided, and the heat-conducting structure is constructed to be able to form a heat-conducting contact with at least part of the outer wall surface of the reaction chamber or to form at least part of the side wall of the reaction chamber, which can greatly improve the heat conduction efficiency. When the heat-conducting structure forms a heat-conducting contact with at least part of the outer wall surface of the reaction chamber, after the heating component heats the heat-conducting structure, the heat of the heat-conducting structure can be quickly transferred from the heat-conducting structure to the reaction chamber, and when the reaction process needs to be cooled, after the cooling medium cools the heat-conducting structure, the heat in the reaction chamber can be directly transferred to the heat-conducting structure to achieve the cooling of the reaction chamber. When the heat-conducting structure forms at least part of the side wall of the reaction chamber, the heating component heating the heat-conducting structure is equivalent to directly heating the reaction chamber, and when the reaction process needs to be cooled, the cooling medium cooling the heat-conducting structure is equivalent to directly cooling the reaction chamber. Through the above arrangement, rapid heating and cooling of materials (such as rare earth materials) in the reaction chamber can be achieved, and precise control and rapid response of the reaction chamber temperature can be achieved, solving the problem of temperature control lag in traditional equipment, thereby ensuring the performance of the prepared magnetic powder.

[0077] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0078] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bonded magnetic powder preparation device, characterized in that: include: A furnace body (10) having a containing cavity (11); A furnace (20) is arranged in the accommodating chamber (11), and the furnace (20) has at least one reaction chamber (21); A heat-conducting structure (40) configured to be capable of forming a heat-conducting contact with at least a portion of an outer wall surface of the reaction chamber (21) or to form at least a portion of a side wall of the reaction chamber (21); A heating component, used for heating the heat-conducting structure (40); The cooling and temperature reduction component (30) comprises a delivery pipeline (31), wherein the delivery pipeline (31) is configured to allow a cooling medium to flow therein, and the cooling medium is used to cool the heat-conducting structure (40).

2. The bonded magnetic powder preparation device according to claim 1, characterized in that: The furnace (20) further comprises an inner cavity and at least one temperature control cavity (22); the heat conducting structure (40) is installed in the inner cavity and divides the inner cavity into at least one reaction cavity (21) and at least one temperature control cavity (22); the heating component comprises a first heating structure (50), the first heating structure (50) is arranged in the temperature control cavity (22); and the cooling medium is in communication with the temperature control cavity (22).

3. The bonded magnetic powder preparation device according to claim 2, characterized in that: There are at least two reaction chambers (21) and at least two temperature control chambers (22), and the at least two reaction chambers (21) and the at least two temperature control chambers (22) are alternately arranged along the circumference of the furnace (20). The temperature control chamber (22) extends along the length direction of the furnace (20). The first end of the delivery pipe (31) is connected to the first end of the temperature control chamber (22), the second end of the temperature control chamber (22) is connected to the accommodating chamber (11), and the second end of the delivery pipe (31) is connected to the accommodating chamber (11).

4. The bonded magnetic powder preparation device according to claim 3, characterized in that: The heat-conducting structure (40) comprises at least one heat-conducting split body (41), and at least one heat-conducting split body (41) is installed in the inner cavity of the furnace (20) and divides the inner cavity into at least one reaction cavity (21) and at least one temperature-control cavity (22). The first heating structure (50) is arranged adjacent to the heat-conducting split body (41), and the portion of the side wall of the temperature-control cavity (22) formed by the heat-conducting split body (41) is a heat exchange portion, and the first heating structure (50) can cover at least a portion of the heat exchange portion.

5. The bonded magnetic powder preparation device according to claim 4, characterized in that: There are two heat-conducting split bodies (41), and the two heat-conducting split bodies (41) are perpendicular to each other.

6. The bonded magnetic powder preparation device according to any one of claims 1 to 5, characterized in that: The bonded magnetic powder preparation device further comprises a second heating structure (60), the second heating structure (60) being installed in the accommodating cavity (11), the second heating structure (60) being sleeved on the outer circumference of the furnace (20), the length extension direction of the second heating structure (60) being the same as the length extension direction of the furnace (20), and the furnace (20) being entirely located within the heating area of ​​the second heating structure (60).

7. The bonded magnetic powder preparation device according to any one of claims 3 to 5, characterized in that: The bonded magnetic powder preparation device further comprises a driving structure (70), wherein the driving structure (70) comprises a driving portion (71) and a rotating shaft (72), wherein the driving portion (71) is drivingly connected to the rotating shaft (72), and the rotating shaft (72) is connected to the furnace core (20) to drive the furnace core (20) to rotate.

8. The bonded magnetic powder preparation device according to claim 7, characterized in that: The bonded magnetic powder preparation device further comprises a power supply structure (80), wherein the power supply structure (80) is sleeved on the rotating shaft (72), and the power supply structure (80) is electrically connected to the first heating structure (50).

9. The bonded magnetic powder preparation device according to claim 8, characterized in that: The power supply structure (80) comprises at least one first electrode (81), at least one first electrode (81) is sequentially sleeved on the outer circumference of the rotating shaft (72), at least one first electrode (81) is arranged in a one-to-one correspondence with at least one first heating structure (50), and the first electrode (81) is electrically connected to the correspondingly arranged first heating structure (50).

10. The bonded magnetic powder preparation device according to claim 9, characterized in that: The power supply structure (80) further comprises at least one brush (82), at least one brush (82) being arranged in one-to-one correspondence with at least one first electrode (81), each brush (82) comprising a contact portion (821) and a pressing portion (822), one end of each contact portion (821) being configured to be connected to an electric control cabinet, and the other end of each contact portion (821) being configured to be in contact with the first electrode (81) corresponding thereto, the pressing portion (822) being mounted on the contact portion (821), and the pressing portion (822) being used to press the contact portion (821) so that the contact portion (821) always maintains contact with the first electrode (81) corresponding thereto.

11. The bonded magnetic powder preparation device according to claim 10, characterized in that: The delivery pipeline (31) further comprises a first branch pipeline (311) and a second branch pipeline (312); one end of the first branch pipeline (311) is connected to the accommodating chamber (11); the other end of the first branch pipeline (311) is connected to one end of the second branch pipeline (312); the other end of the second branch pipeline (312) is connected to the first end of the temperature control chamber (22); part of the rotating shaft (72) is located in the second branch pipeline (312); and the first electrode (81) is located in the second branch pipeline (312).

12. The bonded magnetic powder preparation device according to any one of claims 1 to 5, characterized in that: The furnace body (10) is provided with an air inlet (12) connected to the accommodating chamber (11), and the reaction chamber (21) is connected to the accommodating chamber (11); and / or a plurality of stirring structures (90) are provided on the inner wall of the reaction chamber (21).

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