Rapid drying device for manufacturing of super-fast neodymium-iron-boron magnets
By employing a three-stage drying structure consisting of a preheating chamber, a main drying chamber, and a secondary drying chamber, along with a flipping assembly and nozzle design, the problems of slow drying speed and poor uniformity of traditional NdFeB magnets have been solved, achieving rapid and uniform magnet drying and meeting the needs of industrial production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YOUHONG NEW MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional neodymium iron boron magnet drying devices suffer from slow drying speed, poor drying uniformity, insufficient protection of magnets, and low energy efficiency, making it difficult to meet the needs of large-scale industrial production.
It adopts a three-stage drying structure consisting of a preheating chamber, a main drying chamber, and a secondary drying chamber. Combined with a flipping component and a multi-zone controlled nozzle design, it uses hot air with different wind speeds and temperatures for drying and rapidly cools the magnets through a cooling component, achieving rapid and uniform drying.
It significantly shortens drying time, improves production efficiency, ensures uniform drying of the magnet surface, protects the magnet, and meets the needs of large-scale industrial production.
Smart Images
Figure CN224498993U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of neodymium iron boron magnet manufacturing technology, specifically a rapid drying device for manufacturing ultra-fast neodymium iron boron magnets. Background Technology
[0002] Neodymium iron boron (NdFeB) magnets, as permanent magnet materials with excellent magnetic properties such as high remanence, high coercivity, and high energy product, have been widely used in many fields such as electronics, power, transportation, and energy. In the manufacturing process of NdFeB magnets, the drying process is a crucial step, and its drying effect and efficiency directly affect the quality of the magnets and the production efficiency.
[0003] Traditional methods and equipment for drying NdFeB magnets have several shortcomings. Firstly, the drying speed is slow. Some drying devices use a single drying chamber and a simple hot air supply method, requiring a long time to reach the desired dryness level. This not only increases the production cycle but also reduces overall production efficiency, making it difficult to meet the needs of large-scale industrial production. For example, some traditional drying equipment may require several hours or even longer to dry the magnets to the appropriate moisture content, thus limiting the production line's capacity. Utility Model Content
[0004] To address the shortcomings mentioned in the background technology, the purpose of this utility model is to provide a rapid drying device for manufacturing NdFeB magnets, thereby solving the problems of slow drying speed, poor drying uniformity, insufficient protection of magnets, and low energy utilization efficiency in existing NdFeB magnet drying technologies.
[0005] The objective of this utility model can be achieved through the following technical solutions:
[0006] A rapid drying device for manufacturing NdFeB magnets includes: a conveying unit comprising a first conveying line, a second conveying line, a preheating chamber, a main drying chamber, and a secondary drying chamber; the first conveying line passes through the preheating chamber and extends its end into the main drying chamber; the beginning of the second conveying line is located inside the main drying chamber, and its end passes through the secondary drying chamber; a flipping assembly is provided between the first and second conveying lines; and an air supply unit comprising a hot drying assembly and a cooling assembly.
[0007] Furthermore, the preheating box, the main drying box, and the secondary drying box are arranged sequentially along the material conveying direction, and the preheating box, the main drying box, and the secondary drying box are interconnected.
[0008] Furthermore, the flipping assembly includes a rotary motor fixedly installed inside the drying oven. The output end of the rotary motor is fixedly connected to a flipping wheel. The flipping wheel is symmetrically provided with temporary storage slots. When the magnet enters the temporary storage slot from the first conveyor line, the flipping wheel will drive the magnet to flip 180°.
[0009] Furthermore, the thermal drying assembly includes multiple independent, zone-controllable nozzles installed in the preheating chamber, main drying chamber, and secondary drying chamber. The nozzles adopt a slit design, and their length matches the width of the corresponding preheating chamber, main drying chamber, and secondary drying chamber. A hot air duct is provided at the air inlet end of the nozzle, and an air pump is provided at the air inlet end of the hot air duct. A spiral heating tube is installed inside the end of the hot air duct. The hot air duct is made of high-temperature resistant alloy material. A temperature sensor is provided at the air outlet end of the nozzle, and an airflow regulating valve is installed at the beginning end of the hot air duct.
[0010] Furthermore, the nozzles in the preheating chamber spray hot air onto the magnet surface at a low wind speed and moderate temperature, the nozzles in the main drying chamber spray hot air onto the magnet surface at the highest wind speed and temperature, and the nozzles in the secondary drying chamber have a lower wind speed and temperature than the main drying zone.
[0011] Furthermore, a connecting ring is provided on one side of the nozzle, and a connecting shaft is fixedly connected inside the preheating box, the main drying box and the secondary drying box. The connecting ring is rotatably sleeved on the connecting shaft, and a fixing screw is threaded onto the upper thread of the connecting ring. One end of the fixing screw abuts against the connecting shaft, and the blowing path of the nozzle passes parallel to or at a small angle across the surface of the magnet.
[0012] Furthermore, the cooling assembly includes a negative pressure adsorption channel located at the end of the second conveyor line. The sidewall of the negative pressure adsorption channel has a porous structure, and the bottom of the negative pressure adsorption channel is connected to a negative pressure air duct, which is connected to the air inlet of the air pump.
[0013] More preferably, the first and second conveyor lines are high-temperature resistant mesh belt conveyors, and the mesh belt is woven from stainless steel wire.
[0014] The beneficial effects of this utility model are:
[0015] 1. This utility model, by setting up a preheating box, a main drying box and a secondary drying box and using different drying parameters, enables the magnet to quickly remove moisture during the continuous drying process. In particular, the main drying box uses high-speed and high-temperature hot air jets, which greatly shortens the drying time, improves production efficiency, and meets the needs of large-scale industrial production.
[0016] 2. The flipping component of this utility model allows both sides of the magnet to fully contact the hot air, avoiding the problem of uneven drying. The adjustable nozzle and slit design ensure that the hot air can evenly cover the surface of the magnet, and the high-speed parallel airflow sweeps across the surface of the magnet, forming a strong shearing airflow that efficiently removes moisture. Attached Figure Description
[0017] The present invention will be further described below with reference to the accompanying drawings.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the conveying unit structure in this utility model;
[0020] Figure 3 This is a schematic diagram of the air supply unit structure in this utility model;
[0021] Figure 4 This is a cross-sectional view of the nozzle structure in this utility model.
[0022] In the picture:
[0023] 100. Conveying unit; 101. First conveyor line; 102. Second conveyor line; 103. Preheating box; 104. Main drying box; 105. Secondary drying box; 106. Tilting assembly; 106a. Rotary motor; 106b. Tilting wheel; 106c. Temporary storage tank;
[0024] 200, Air supply unit; 201, Hot drying assembly; 202, Cooling assembly; 201a, Nozzle; 201b, Hot air duct; 201c, Air pump; 201d, Spiral heating tube; 201e, Temperature sensor; 201f, Air volume regulating valve; 201g, Connecting ring; 201h, Connecting shaft; 201i, Fixing screw; 202a, Negative pressure adsorption channel; 202b, Negative pressure air duct. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0026] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0027] like Figure 1-4 As shown, a rapid drying device for manufacturing neodymium iron boron magnets includes a conveying unit 100 and an air supply unit 200.
[0028] The conveying unit 100 includes a first conveyor line 101, a second conveyor line 102, a preheating chamber 103, a main drying chamber 104, and a secondary drying chamber 105. The first conveyor line 101 passes through the preheating chamber 103 and extends into the main drying chamber 104. Its function is to convey the NdFeB magnets to be dried to the preheating chamber 103 for preliminary preheating, preparing them for the subsequent drying process. The second conveyor line 102 begins inside the main drying chamber 104 and extends through the secondary drying chamber 105. It is used to convey the magnets, after preliminary drying in the main drying chamber 104, to the secondary drying chamber 105 for further drying and cooling. A flipping assembly 106 is provided between the first conveyor line 101 and the second conveyor line 102.
[0029] The preheating chamber 103, the main drying chamber 104, and the secondary drying chamber 105 are arranged sequentially along the material conveying direction and are interconnected. This arrangement allows the magnet to pass through the three stages of preheating, main drying, and secondary drying in a continuous drying environment, ensuring the continuity and efficiency of the drying process.
[0030] The flipping assembly 106 includes a rotary motor 106a fixedly installed inside the main drying chamber 104. A flipping wheel 106b is fixedly connected to the output end of the rotary motor 106a, and temporary storage slots 106c are symmetrically formed on the flipping wheel 106b. When the magnet enters the temporary storage slot 106c from the first conveyor line 101, the flipping wheel 106b will rotate the magnet 180°. This ensures that the other side of the magnet can also fully contact the hot air, improving the uniformity of drying and preventing one side from being over-dried while the other side is under-dried.
[0031] Air supply unit 200
[0032] The air supply unit 200 includes a hot drying component 201 and a cooling component 202.
[0033] The hot drying assembly 201 includes multiple independent, zone-controllable nozzles 201a installed in the preheating chamber 103, main drying chamber 104, and secondary drying chamber 105. The nozzles 201a employ a slit design, with their length matching the width of the corresponding preheating chamber 103, main drying chamber 104, and secondary drying chamber 105, ensuring uniform coverage of the magnet surface by hot air. A hot air duct 201b is installed at the air inlet end of the nozzle 201a, and an air pump 201c is installed at the air inlet end of the hot air duct 201b, providing power for the delivery of hot air. A spiral heating tube 201d is installed inside the end of the hot air duct 201b to heat the air and generate hot air. The hot air duct 201b is made of a high-temperature resistant alloy material to ensure stability and durability under high-temperature conditions. A temperature sensor 201e is installed at the air outlet end of the nozzles 201a to monitor the temperature of the hot air in real time, facilitating precise control of the drying process. The beginning of the hot air duct 201b is equipped with an air volume regulating valve 201f, which can adjust the air volume of the hot air according to different drying stages and needs.
[0034] During the drying process, nozzles 201a in the preheating chamber 103 spray hot air onto the magnet surface at a low wind speed and moderate temperature. This avoids internal stress and damage to the magnet due to sudden high temperatures, serving as preheating and preliminary drying. In the main drying chamber 104, nozzles 201a spray hot air onto the magnet surface at the highest wind speed and temperature, quickly removing most of the moisture and increasing the drying speed. In the secondary drying chamber 105, nozzles 201a operate at lower wind speeds and temperatures than the main drying zone, further drying and stabilizing the magnet to ensure its moisture content meets the final requirements.
[0035] A connecting ring 201g is provided on one side of the nozzle 201a. Connecting shafts 201h are fixedly connected inside the preheating chamber 103, the main drying chamber 104, and the secondary drying chamber 105. The connecting ring 201g is rotatably sleeved on the connecting shaft 201h. A fixing screw 201i is threaded onto the connecting ring 201g, with one end of the fixing screw 201i abutting against the connecting shaft 201h. This structure allows adjustment of the nozzle 201a's angle, enabling the airflow path of the nozzle 201a to pass parallel to or at a small angle across the magnet surface, further improving the contact effect between the hot air and the magnet and enhancing the drying effect.
[0036] The cooling assembly 202 includes a negative pressure adsorption channel 202a located at the end of the second conveyor line 102. The sidewalls of the negative pressure adsorption channel 202a have a porous structure, and the bottom of the negative pressure adsorption channel 202a is connected to a negative pressure air duct 202b, which is connected to the air inlet of the air pump 201c. Its function is to quickly reduce the temperature of the magnet by negative pressure adsorption after the magnet has dried, so that the magnet can enter the subsequent process in time. At the same time, it can also adsorb some small impurities on the surface of the magnet.
[0037] The first conveyor line 101 and the second conveyor line 102 are high-temperature resistant mesh belt conveyors, with the mesh belts woven from stainless steel wire. This structure has good high-temperature resistance and air permeability, ensuring the stability of the magnets during the conveying process, while also facilitating full contact between hot air and the magnets, thus improving drying efficiency.
[0038] Workflow
[0039] The neodymium iron boron magnets to be dried are placed on the first conveyor line 101, which transports them to the preheating chamber 103. Inside the preheating chamber 103, the magnets undergo initial preheating. When the magnets reach the end of the first conveyor line 101, they enter the temporary storage tank 106c of the flipping assembly 106. The rotary motor 106a starts, driving the flipping wheel 106b to rotate 180°, flipping the magnets over. The flipped magnets fall onto the second conveyor line 102, which sequentially transports them to the main drying chamber 104 and the secondary drying chamber 105.
[0040] Inside the preheating chamber 103, air pump 201c draws air into hot air duct 201b, and spiral heating tube 201d heats the air to form hot air. Airflow regulating valve 201f at the beginning of hot air duct 201b adjusts the airflow to a suitable level, causing nozzle 201a to spray hot air onto the magnet surface at a low velocity and moderate temperature. Temperature sensor 201e monitors the hot air temperature in real time, ensuring the temperature remains stable within a suitable range. This stage provides initial preheating and drying of the magnet, allowing it to gradually adapt to the subsequent high-temperature drying environment.
[0041] After the magnet enters the main drying chamber 104, the air pump 201c increases its power to raise the air velocity of the hot air. Simultaneously, the spiral heating tube 201d increases its heating power, bringing the hot air to its maximum temperature. The nozzle 201a sprays hot air onto the magnet surface at high velocity and temperature, quickly removing most of the moisture from the magnet.
[0042] After the magnet enters the secondary drying chamber 105, the airflow regulating valve 201f adjusts the airflow of the hot air, causing the nozzle 201a to spray hot air onto the magnet surface at a lower airflow velocity and temperature than in the main drying zone. This stage further dries and stabilizes the magnet, ensuring that its moisture content meets the final requirements.
[0043] When the magnet reaches the negative pressure adsorption channel 202a at the end of the second conveyor line 102, the air pump 201c creates a negative pressure environment within the negative pressure adsorption channel 202a through the negative pressure air duct 202b. Because the sidewall of the negative pressure adsorption channel 202a has a porous structure, air and minute impurities are drawn into the negative pressure air duct 202b through the pores in the sidewall, simultaneously carrying away heat from the magnet's surface, causing the magnet to cool down rapidly. After drying and cooling, the magnet is output from the end of the second conveyor line 102, and the entire drying process is complete.
[0044] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A rapid drying apparatus for manufacturing neodymium iron boron magnets, characterized in that, include: The conveying unit (100) includes a first conveying line (101), a second conveying line (102), a preheating box (103), a main drying box (104), and a secondary drying box (105). The first conveying line (101) passes through the preheating box (103) and extends to the main drying box (104) at its end. The beginning of the second conveying line (102) is located in the main drying box (104), and its end passes through the secondary drying box (105). A flipping assembly (106) is provided between the first conveying line (101) and the second conveying line (102). The air supply unit (200) includes a heat drying assembly (201) and a cooling assembly (202).
2. The rapid drying apparatus for manufacturing neodymium iron boron magnets according to claim 1, characterized in that, The preheating box (103), the main drying box (104), and the secondary drying box (105) are arranged sequentially along the material conveying direction, and the preheating box (103), the main drying box (104), and the secondary drying box (105) are interconnected.
3. The rapid drying apparatus for manufacturing neodymium iron boron magnets according to claim 1, characterized in that, The flipping assembly (106) includes a rotary motor (106a) fixedly installed inside the drying oven. The output end of the rotary motor (106a) is fixedly connected to a flipping wheel (106b). The flipping wheel (106b) is symmetrically provided with temporary storage slots (106c). When the magnet enters the temporary storage slot (106c) from the first conveyor line (101), the flipping wheel (106b) will drive the magnet to flip 180°.
4. The rapid drying apparatus for manufacturing neodymium iron boron magnets according to claim 1, characterized in that, The heat drying assembly (201) includes multiple independent, zone-controllable nozzles (201a) installed in the preheating chamber (103), the main drying chamber (104), and the secondary drying chamber (105). The nozzles (201a) adopt a slit design, and their length matches the width of the corresponding preheating chamber (103), the main drying chamber (104), and the secondary drying chamber (105). A hot air pipe (201b) is provided at the air inlet end of the nozzle (201a), and an air pump (201c) is provided at the air inlet end of the hot air pipe (201b). A spiral heating tube (201d) is installed inside the end of the hot air pipe (201b). The hot air pipe (201b) is made of high-temperature resistant alloy material. A temperature sensor (201e) is provided at the air outlet end of the nozzle (201a), and an airflow regulating valve (201f) is installed at the beginning end of the hot air pipe (201b). The nozzle (201a) inside the preheating box (103) sprays hot air onto the magnet surface at a low wind speed and moderate temperature. The nozzle (201a) of the main drying box (104) sprays hot air onto the magnet surface at the highest wind speed and temperature. The wind speed and temperature of the nozzle (201a) of the secondary drying box (105) are lower than those of the main drying area. A connecting ring (201g) is provided on one side of the nozzle (201a). The interior of the preheating box (103), the main drying box (104) and the secondary drying box are all fixedly connected to a connecting shaft (201h). The connecting ring (201g) is rotatably sleeved on the connecting shaft (201h). A fixing screw (201i) is threaded onto the upper thread of the connecting ring (201g). One end of the fixing screw (201i) abuts against the connecting shaft (201h). The blowing path of the nozzle (201a) is parallel or at a small angle across the magnet surface.
5. The rapid drying apparatus for manufacturing neodymium iron boron magnets according to claim 1, characterized in that, The cooling assembly (202) includes a negative pressure adsorption channel (202a) located at the end of the second conveyor line (102). The sidewall of the negative pressure adsorption channel (202a) is porous. The bottom of the negative pressure adsorption channel (202a) is connected to a negative pressure air duct (202b), which is connected to the air inlet of the air pump (201c).
6. The rapid drying apparatus for manufacturing neodymium iron boron magnets according to claim 1, characterized in that, The first conveyor line (101) and the second conveyor line (102) are high-temperature resistant mesh belt conveyors, and the mesh belt is woven from stainless steel wire.